JPH073076B2 - Bucket assembly for earthmoving vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bucket assembly for an earthmoving vehicle, and more particularly to a bucket assembly for an earthmoving vehicle that can be discharged to the side.

<Prior Art> When the earthwork vehicle is equipped with a bucket assembly to perform earthwork work, for example, when the work site is in a tunnel, the earth and sand loaded in the bucket is moved forward as in the normal case. Often, it is desired to discharge laterally instead of discharging.

Therefore, conventionally, a so-called three-way type bucket assembly that can be discharged not only to the front side but also to the left side or the right side according to need has been proposed and put into practical use.

As a known three-way type bucket assembly, for example, Japanese Patent Application Laid-Open No. 57-33634 discloses a bucket support mounted on a lift arm and a tilt link of an earthmoving vehicle, and a pair of detachable detachable bodies arranged on both sides. A bucket supported by the bucket support via a pivot pin,
A fluid pressure cylinder mechanism interposed between the bucket support and the bucket, a swing member rotatably mounted on the bucket support, and two pieces respectively entering holes formed on both sides of the bucket. Connection pin and a link mechanism that connects the swivel member and each of the connection pins, and one end of the fluid pressure cylinder mechanism is connected to one of two receiving portions provided on both upper rear sides of the bucket. The fluid pressure cylinder mechanism is pivotally connected, and the other end of the fluid pressure cylinder mechanism is pivotally connected to the pivot member. The pivot member is the fluid pressure cylinder mechanism of the two receiving portions provided on the bucket support. There is proposed a bucket assembly rotatably connected to a mounting portion corresponding to a receiving portion to which one end of is connected.

In the above bucket assembly, in order to allow discharge to the left side (or the right side), first, the right side (or the left side) pivot pin is disengaged, and one end of the fluid pressure cylinder mechanism is attached to the left side (or the right side) of the bucket. ), The turning member is connected to the right (or left) mounting portion, and the other end of the connecting member is connected to the right (or left) link mechanism. In this state, when the fluid pressure cylinder mechanism is extended, the engagement state between the right (or left) connecting pin and the right (or left) hole formed in the bucket body is released, and the left (or right) ), The bucket is pivoted to the left (or right) discharge position around the pivot pin, and then, when the fluid pressure cylinder mechanism is contracted, the right (or left) connecting pin is moved to the right (or left) side of the bucket body. ), The bucket is returned to its original condition.

However, in such a bucket assembly, as will be easily understood from the above description, in order to change from the left (or right) dischargeable state to the right (or left) dischargeable state, first, the fluid pressure is set. Remove the cylinder mechanism and swivel member, and connect one end of the fluid pressure cylinder mechanism from the left (or right) receiving part of the bucket to the right (or left) receiving part.
Connect the swivel member from the right (or left) mounting part of the bucket support to the left (or right) mounting part, and connect one end of the swivel member from the right (or left) link mechanism to the left (or right) link mechanism. Therefore, there is a problem that the work for changing the discharge direction is complicated and takes time.

Therefore, in order to solve the above-mentioned problems, for example, in
In the 59-15133 publication, in a bucket assembly for an earthmoving vehicle composed of a bucket, a bucket support, and a side dump fluid pressure cylinder mechanism, the bucket includes a bucket body and a receiving portion provided on an upper rear portion of the bucket body. The first main body is mounted on both lower sides of the back surface of the bucket body and serves as the pivot center of the bucket body when discharged to the side.
And a second supported portion including a second pivot pin, and the bucket support includes a support body, a mounting portion provided on the support body, and first and second supported portions of the bucket. The first and second support portions for receiving and supporting the support portions respectively, and the first and second support portions engaging with the first and second supported portions, respectively.
And an operating position for holding the second supported portion and the first
And the first and second members mounted on the support body so as to be pivotable between the non-acting position where they are separated from each of the second supported parts.
Locking operation including a hook switching member, a first and second hook member, a connecting rod connecting the first and second hook members, and a lock switching fluid pressure cylinder mechanism for moving the connecting rod. The rod of the fluid pressure cylinder mechanism for side dump is rotatably connected to the receiving portion of the bucket, and the cylinder of the fluid pressure cylinder mechanism for side dump is rotatably connected to the mounting portion of the support body. Bucket assembly is proposed.

In such a bucket assembly, when the lock switching fluid pressure cylinder mechanism is extended, the first hook member is positioned at the working position and the second hook member is positioned at the non-working position via the connecting rod. The first supported portion of the bucket is held by the first supported portion of the bucket support, and the second supported portion is second.
Can be disengaged from the support part, and by extending the side dump fluid pressure cylinder mechanism, the bucket is pivoted to the left around the first pivot pin.
On the other hand, when the lock switching fluid pressure cylinder mechanism is contracted, the first hook member is positioned in the non-operating position and the second hook member is positioned in the operating position, contrary to the above, via the connecting rod. As a result, the second supported portion of the bucket is held by the second supported portion of the bucket support, and the first supported portion can be detached from the first support portion. Thus, the side dump fluid pressure cylinder mechanism is provided. Extending causes the bucket to pivot to the right about the second pivot pin. Thus, the discharge direction can be changed by expanding and contracting the lock switching fluid pressure cylinder mechanism.However, the bucket is in a so-called cantilever state (that is, the bucket One of the first and second supported portions is securely held by the first and second support portions of the bucket support by the action of the first and second hook members, while the other of them is the first. And the second hook member is not securely held by the first and second support portions), the bucket cannot be reliably held by the bucket support, and sufficient safety is ensured. Not done, and also the load applied to the bucket during work is concentrated on the left or right pivot pin and its associated components, which has a significant adverse effect on their durability.

As a technique for solving the above problems, for example, there is a side discharge loader disclosed in Japanese Patent Publication No. 46-31066. Both sides of the bucket 11 are selectively and releasably coupled to the lifting arm 12 of the loader by pin mechanisms 23 ', 23 "for side ejection of the bucket 11 of the loader. The receiving members 21 and 22 that connect the lifting arm 12 are connected by a hydraulic jack 31. By releasing one of the pin mechanisms 23 ', 23 "and extending the jack 31, the bucket 11 is engaged. The pin 29 on the mating side can be tilted.

The loader configured as described above has the following problems.

(1) The four pins 29 of the pin mechanisms 23 ', 23 "provided on the receiving members 21 and 22 can be released in the four holes 28 formed in the brackets 26 and 27 on the bucket 11 side. By engaging the bucket 11, the bucket 11 is held on the receiving members 21 and 22 side.
It is configured to be released. Therefore, there is a high possibility that the pin 29 will not engage with the hole 28 due to the accumulation of earth and sand, the deformation of the bucket 11, etc., and the engagement is uncertain. When excavation work is performed in this state, the pin 29 and other parts are more likely to be damaged. On the other hand, when excavation work is performed with the pin 29 engaged with the hole 28, if the bucket 11 is deformed, the pin 29 may not be able to come out of the hole 28. Further, the play between the pin 29 and the hole 28 tends to cause wear, which causes a problem in durability. That is, in the loader, the bucket 11 cannot be held / released with sufficient reliability, and there is a high possibility that the bucket 11 cannot be discharged (tilted). Further, the tilting pivot portion of the bucket 11 may be damaged, which causes a problem in durability.

(2) The weight of the bucket 11 or the load is four pins 29
It is supported by. That is, the brackets 26 and 27 and the pin 29 always receive a load, and a large frictional resistance acts. Furthermore, when the bucket 11 is filled with earth and sand to be discharged, the reaction force of the compression spring 39 in the cylinder 34 and the earth and sand jams make it difficult for the pin 29 to slip out of the hole 28. If the bucket 11 is tilted in this state, the pressure oil from the supply source 44 'overcomes the set pressure of the relief valve 54 of the sequence valve 52 and the jack 31
Will flow to the head side. Since the jack 31 is extended while the four pins 29 are extended (engaged with the holes 28), the pin 29 or a weak portion related to the pin 29 is damaged. In this case, if only one pin 29 is a hole
If it is disengaged from 28, a larger eccentric load will ensure damage. Therefore, in the loader, not only the earth unloading work is not reliably performed, but also the tilting pivot of the bucket 11 may be damaged.

(3) When the bucket 11 is returned to the horizontal position after the soil is discharged, it is necessary to maintain the engaged state of the pin 29, which is the turning center, and the retracted state of the other pin 29. bucket
When the jack 31 is retracted to bring the 11 into the horizontal position, the diaphragm 61 produces a large back pressure. This pressure is selected valve 46
Depending on the setting of, the conduit 42 or 43 is communicated. This back pressure causes the pin 29 of the pin mechanism 23 'or 23 "to be in the retracted position,
When the jack 31 is retracted and the pin 29 enters between the brackets 26 and 27, and when the pin 29 coincides with the hole 28, the back pressure decreases and the pin 29 extends and engages with the hole 28. However, it is difficult to reliably hold the pin 29 in the retracted position by overcoming the urging force of the compression spring 39, the frictional resistance, etc., only by the back pressure. If the pin 29 cannot be held in the retracted position, the pin 29 may be damaged. Also jack 31
Even when pulling in slowly, the back pressure of the throttle 61 becomes small, and the same problem occurs. Therefore, in the loader, when the bucket 11 is lowered,
The tilting axis part of may be damaged.

(4) The compression spring 39 is used in the cylinder 34, the accumulator 57, the valve 59, the bleed valve 60 and the like are used in the conduit 48, and the compressed gas and the like are used in the conduit 48 to balance the opening and closing of the pin 29. However, it cannot be balanced with the insertion state (friction resistance) of the pin 29 into the hole 28, the load condition from the bucket 11, the weight of the bucket 11, the weight of earth and sand, the front-back direction of the bucket 11, and the like. Or sequence valve
It cannot be balanced with 52. Therefore, the pin
The engagement / disengagement operation of 29 with respect to the hole 28 may not be performed as desired. That is, in the loader, not only is the soil removal work of the bucket 11 not reliably performed, but the tilting pivot portion of the bucket 11 may be damaged.

<Purpose of the Invention> The main object of the present invention is that the holding and releasing of the bucket can be carried out with sufficient certainty, and therefore the bucket excavation work and earth removal work can be carried out reliably, and the tilting pivot of the bucket is damaged. It is an object of the present invention to provide a bucket assembly for an earthmoving vehicle, which has excellent durability and is free from the danger.

<Summary of the Invention> According to the present invention, a bucket, a bucket support mounted on an earthmoving vehicle, and a hydraulic cylinder for a side dump interposed between the bucket support and the bucket support to perform a lateral discharge operation of the bucket. And a fluid pressure control system including a mechanism, the bucket assembly for an earthmoving vehicle, wherein the bucket is mounted on both rear and rear sides of the bucket and serves as a swing center of the bucket when discharged laterally.
And a second supported portion including a second pivot pin, the first and second supported portions being respectively rotatably supported by the first and second pivot pins. And the second
The bucket support has first and second supporting portions for receiving and supporting the first and second supported portions of the bucket, respectively, and the first and second supporting portions of the bucket. The engagement between the first and second rollers and the operating position for engaging the second roller to hold the first and second supported portions on the first and second supporting portions is released. First and second members mounted on the bucket support so as to be rotatable between a non-acting position for releasing the holding
And a pair of locking hydraulic cylinder mechanisms interposed between each of the first and second hook members and the bucket support, and a non-selective non-locking hydraulic cylinder mechanism. Position of action,
A manual switching valve positioned in a first operating position and a second operating position, first and second switching valves selectively positioned in a non-operating position and an operating position, respectively, and a fluid connected to a fluid pressure source. A first fluid pressure flow path connecting a pressure supply flow path, a fluid pressure return flow path connected to a fluid pressure reservoir, an extension side of the side dump fluid pressure cylinder mechanism, and the first and second switching valves. A passage, a second fluid pressure passage connecting the contraction side of the side dump fluid pressure cylinder mechanism and the first and second switching valves, and an extension side of the one locking fluid pressure cylinder mechanism and the other. A third fluid pressure flow path connecting the contraction side of the lock fluid pressure cylinder mechanism, the contraction side of the one lock fluid pressure cylinder mechanism and the expansion side of the other lock fluid pressure cylinder mechanism. A fourth fluid pressure channel, wherein the manual switching valve The first fluid pressure supply passage and the first fluid pressure passage are in communication with each other and the second fluid pressure return passage is in communication with the second fluid pressure passage, and the second fluid pressure passage is in communication with the second fluid pressure passage.
The fluid pressure supply passage and the second fluid pressure passage are communicated with each other, the fluid pressure return passage and the first fluid pressure passage are communicated with each other, and the fluid pressure supply passage is in the non-actuation position. At any time, the communication state is shut off, and the first switching valve communicates the first fluid pressure flow passage and the fourth fluid pressure flow passage when the second switching valve is in the operating position, The fluid pressure flow passage and the third fluid pressure flow passage are communicated with each other, the communication state is shut off when in the non-acting position, and the second switching valve is provided with the first fluid when in the working position. A pressure flow path and the third fluid pressure flow path are in communication with each other, the second fluid pressure flow path is in communication with the fourth fluid pressure flow path, and the communication state is cut off when in the non-acting position; The side dump fluid when the second switching valve is in the operating position and the manual switching valve is in the second operating position. As contraction of said one of the locking fluid pressure cylinder mechanism is started after the cylinder mechanism has been deflated, the fourth
A first sequence valve is disposed in the fluid pressure flow path of the side dump fluid, and the first switching valve is in the operating position and the manual switching valve is in the second operating position. The third locking fluid cylinder mechanism is configured to start contracting after the mechanism is contracted so that the third
A second sequence valve in the fluid pressure flow path of the second fluid pressure flow path when the first switching valve is in the operating position and the manual switching valve is in the second operating position. A check valve is arranged in the third fluid pressure flow passage and the second switching valve is in the working position so that the fluid pressure from the above does not act on the extension side of the one locking fluid pressure cylinder mechanism. And when the manual switching valve is in the second operating position, the fluid pressure from the second fluid pressure passage is prevented from acting on the extension side of the other locking fluid pressure cylinder mechanism. There is provided a bucket assembly for an earthmoving vehicle, characterized in that a check valve is arranged in the fluid pressure flow path.

<Preferred Embodiments of the Invention> Hereinafter, further details will be described with reference to the accompanying drawings.

1 and 2 showing a specific example of a bucket assembly constructed according to the present invention, the illustrated bucket assembly generally designated by the numeral 2 is a bucket 4, a bucket support 6 and a bucket 4 and a bucket support 6. A side dump fluid pressure cylinder mechanism 8 (first fluid pressure cylinder mechanism) interposed therebetween is provided (FIG. 2 shows only the bucket support 6).

The bucket 4 is provided with a bucket body 10 which is suitable for operations such as excavation and loading, and which may have an appropriate shape suitable for discharging to the front and both sides.

As will be described later, a receiving portion 12 to which the side dump fluid pressure cylinder mechanism 8 is connected is provided on the upper rear surface of the bucket body 10. Further, the first supported portion 14a and the second supported portion 14b are provided on both lower sides of the back surface of the bucket body.
Is provided. The first supported portion 14a is a first pivot pin 16a fixed to a predetermined position on the rear left end of the bucket body 10 as clearly shown in FIG.
(In the specific example, two are arranged at a predetermined interval in the vertical direction). Such first pivot pin 16a
As will be described later, is a turning center when turning the bucket body 10 to the left discharge position, and is arranged so as to extend in a direction substantially perpendicular to the width direction of the bucket body 10. . A first roller 20a is preferably rotatably fitted on the first pivot pin 16a via an appropriate bearing member 18a.

On the other hand, the second supported portion 14b has substantially the same configuration as the first supported portion 14a, and is fixed to a predetermined position on the rear rear right end of the bucket body 10 to eject the bucket body 10 rightward. At least one second pivot pin 16b (in the specific example, two pivot pins 16b are arranged at a predetermined interval in a direction perpendicular to the plane of the drawing in FIG. 1) forming a pivot center when pivoting to a position. Have. In the second pivot pin 16b,
Similar to the first pivot pin 16a, it is preferable that the second roller 20b is fitted through an appropriate bearing member (not shown).

Next, the bucket support 6 includes a support body 22. This support body 22 has a hinge plate 24a
And 24b and a mounting bracket 26 are provided, and the portions 28a and 28b of the hinge plates 24a and 24b are rotatably connected to the tips of a pair of lift arms (not shown) of the earthmoving vehicle, respectively. Bracket 26 part
30 is pivotally connected to the tip of a single tilt link (not shown) of the earthmoving vehicle, thus mounting the support body 22 on the earthmoving vehicle.

The support body 22 has a first support portion 32a and a second support portion for receiving and supporting the first supported portion 14a and the second supported portion 14b provided on the bucket body 10, respectively. 32b
Is provided. First support portion 32a and second support portion 32b
Each of the shaft members is a shaft member fixed to both sides of the support body 22, as can be easily understood from FIGS. 1, 3, and 4.
It is composed of a pair of support pieces 36a and 36b fixed to 34a and 34b, respectively, and having open substantially semicircular support surfaces for receiving and supporting the first roller 20a and the second roller 20b, respectively.

A first hook member 38a and a second hook member 38b are further attached to the support body 22 adjacent to the first support portion 32a and the second support portion 32b, respectively. Each of the first hook member 38a and the second hook member 38b is attached to the shaft members 34a and 34b fixed to both sides of the support body 22, as can be easily understood from FIGS. 1 to 3. Each of the first hook member 38a and the second hook member 38b is mounted via an appropriate bearing member 40, and therefore, the first hook member 38a and the second hook member 38b are respectively connected to the first supported portion 14a provided on the bucket body 10. It is freely rotatable between an operating position where it engages with the second supported portion 14b and a non-operating position where it disengages from it. The first hook member 38a and the second hook member 38b are respectively claw-shaped hook pieces 42a and 42b (in the specific example, corresponding to the first supported portion 14a and the second supported portion 14b, respectively). Two are provided), and a pair of locking fluid pressure cylinder mechanisms 44 described later.
a and 44b (a pair of second fluid pressure cylinder mechanisms) are respectively connected to connecting pieces 46a and 46b (in the specific example, a pair of connecting pieces 46a is provided between two hook pieces 42a, and two connecting pieces 46a are provided). A pair of connecting pieces 46b is provided between the hook pieces 42b). When the hook piece 42a is in the working position shown in FIGS. 1 and 3 and shown by the solid line in FIG. 4, the first roller 20a of the first supported portion 14a provided in the bucket body 10 is provided. , And is disengaged from the first roller 20a when in the non-acting position shown by the chain double-dashed line in FIG. Further, when the hook piece 42b is in the working position shown in FIG. 1 and shown by the solid line in FIG.
The second supported portion 14b provided at 10 is engaged with the second roller 20b and is disengaged from the second roller 20b when it is in the non-acting position shown by the chain double-dashed line in FIG. . First above
Between the hook member 38a and the second hook member 38b of the support body 22 and the support body 22, a locking fluid pressure cylinder mechanism 44 is provided.
Each of a and 44b is interposed. The pair of locking fluid pressure cylinder mechanisms 44a and 44b respectively include the cylinders 48a and 4a.
This is a so-called rod type cylinder mechanism including 8b and rods 50a and 50b slidable with respect to the cylinders 48a and 48b. In the specific example, one cylinder 48a of the locking hydraulic cylinder mechanism 44a is pivotally connected to a bracket 52a fixed to one mounting bracket 26 via a pin 54, and its rod 50a is connected to a pin 56 (see FIG. 3). , FIG. 4), and is pivotally connected to the connecting piece 46a. Further, the cylinder 48b of the other locking fluid pressure cylinder mechanism 44b has a pin 5 attached to the bracket 52b fixed to the other mounting bracket 26.
It is rotatably connected to the connecting piece 46b via 8
50b is pivotally connected via a pin 60 (Fig. 4). Therefore, one of the lock fluid pressure cylinder mechanisms 44a
When (or the other locking fluid pressure cylinder mechanism 44b) is extended, the first hook member 38a (or the second hook member 38b) is moved around the shaft member 34a (or 34b) as shown in FIGS. In the drawing, it is turned counterclockwise (or clockwise) to be positioned at the non-acting position, while the one lock fluid pressure cylinder mechanism 44a (or the other lock fluid pressure cylinder mechanism 44b) is contracted. And the first hook member 38a (or the second hook member 38b) becomes the shaft member 34a.
(Or 34b) as a center, it is turned clockwise (or counterclockwise) in FIGS. 1 and 4 to be positioned at the working position. The one lock fluid pressure cylinder mechanism 44a and the other lock fluid pressure cylinder mechanism 44b.
Is configured so that its operation can be switched by operating a changeover switch (described later). A mounting portion 62 is further provided in the upper central portion of the support body 22.

The side dump fluid pressure cylinder mechanism 8 is a cylinder 64
And the cylinder 64 is slidable with respect to the cylinder 64.
It is composed of a so-called single rod type cylinder mechanism having a single rod 66 protruding from one end of the. In this side dump fluid pressure cylinder mechanism 8, the tip of the rod 66 is pinned to the receiving portion 12 provided on the upper rear surface of the bucket body 10.
The so-called head end side of the cylinder 64 is rotatably connected via a pin 68 to a mounting portion 62 provided on the support body 22.
It is connected via a. In the side dump fluid pressure cylinder mechanism 8, the tip of the rod 66 is attached to the mounting portion 62, and the head end of the cylinder 64 is attached to the receiving portion 12.
It may be rotatably connected to. As described later, the side dump fluid pressure cylinder mechanism 8 is extended when the soil and the like contracted in the bucket 4 are discharged sideways.

Next, referring to FIG. 5, the fluid pressure control system according to the present invention installed in the bucket assembly 12 described above will be described.

The illustrated fluid pressure control system includes a side dump fluid pressure cylinder mechanism 8 and a pair of lock fluid pressure cylinder mechanisms.
Manual switching valve 72 and first switching valve 74 together with 44a and 44b
And a second switching valve 76 (a pair of switching valves). The manual switching valve 72 is selectively positioned in the non-acting position, the first actuating position, or the second actuating position. Also,
Each of the first switching valve 74 and the second switching valve 76 is selectively positioned in a non-acting position and an actuating position, respectively, and may preferably comprise a solenoid valve. Further, in the above fluid pressure control system, a fluid pressure source 78 such as a pressure oil pump and a manual switching valve 72 are connected via a fluid pressure supply passage 80, and a fluid pressure reservoir 82 such as a pressure oil tank and a manual switching valve are connected. The valve 72 is connected via a fluid pressure return flow path 84. Further, the extension side of the side dump fluid pressure cylinder mechanism 8, in the specific example, the head side of the cylinder 64 and the first switching valve 74 and the second switching valve 76 are connected via a first fluid pressure flow path 86. The first fluid pressure channel 86 is branched and connected to the manual switching valve 72. Further, the contraction side of the side dump fluid pressure cylinder mechanism 8, in the specific example, the rod side of the cylinder 64 and the first switching valve 74 and the second switching valve 76 are connected via a second fluid pressure flow passage 88. The second fluid pressure passage 88 is also branched and connected to the manual switching valve 72. Further, the extension side of one of the locking fluid pressure cylinder mechanisms 44a, in the specific example, the head side of the cylinder 48a and the other of the locking fluid pressure cylinder mechanism 4a.
The contraction side of 4b, in the specific example, the rod side of the cylinder 48b is connected via a third fluid pressure channel 90, and this third fluid pressure channel 90 branches to a first switching valve 74 and a second switching valve 74. Switching valve
It is connected to 76 respectively. Furthermore, the contraction side of one lock fluid pressure cylinder mechanism 48a, in the specific example, the rod side of the cylinder 48a and the other lock fluid pressure cylinder mechanism 4a.
The extension side of 4b, in the specific example, the head side of the cylinder 48b, is connected via a fourth fluid pressure passage 92, and the fourth fluid pressure passage 92 is branched to form a first switching valve 74 and a second switching valve 74. Each is connected to the switching valve 76. Therefore, as will be easily understood from FIG. 5, the manual switching valve 72 communicates the fluid pressure supply passage 80 and the first fluid pressure passage 86 with each other when the fluid pressure supply passage 80 is in the first operating position. Return channel 84 and second fluid pressure channel
88 to communicate with the fluid pressure supply flow channel 880 and the second fluid pressure flow channel 88 when in the second operating position, and to connect the fluid pressure return flow channel 84 and the first fluid pressure flow channel 86. In the communication, and when in the non-acting position, any of the communication states described above is shut off. Further, the first switching valve 74 has the first fluid pressure passage 86 and the fourth fluid pressure passage 92 when it is in the operating position.
And the second fluid pressure flow passage 88 and the third fluid pressure flow passage 90 are communicated with each other, and the above-mentioned communication state is blocked when in the non-acting position. Further, the second switching valve 76 communicates the first fluid pressure flow passage 86 and the third fluid pressure flow passage 90 with each other and the second fluid pressure flow passage 88 and the fourth fluid pressure flow passage 88 when in the operating position.
To communicate with the fluid pressure channel 92.

In the illustrated fluid pressure control system, a first sequence valve 94 is further provided in the fourth fluid pressure passage 92, and a check valve 98 is provided in a bypass passage 96 bypassing the first sequence valve 94. Is provided. The first sequence valve 94 is
As will be described later, after the side dump fluid pressure cylinder mechanism 8 is contracted as required, the lock fluid pressure cylinder mechanism 44a is contracted and opened. Further, a second sequence valve 100 is arranged in the third fluid pressure flow passage 90, and a check valve 104 is also arranged in the bypass flow passage 102 that bypasses the second sequence valve 100. As will be described later, the second sequence valve 100 acts so that the contraction of the lock hydraulic cylinder mechanism 44b is started after the side dump hydraulic cylinder mechanism 8 is contracted as required. In the specific example, the third fluid pressure channel 90 and the fourth fluid pressure channel 90 are further provided.
Check valves 106 and 108 are provided in each of the fluid pressure flow paths 92. The first switching valve 74, the second switching valve 76,
The first sequence valve 94 and the second sequence valve 100, as well as the check valves 98, 104, 106 and 108 are housed in a control box (not shown). Then, preferably, as in the specific example, the control box is attached to a connecting member connected between the pair of lift arms via an elastic member such as rubber (not shown).

The operation of the first switching valve 74 and the second switching valve 76, which are electromagnetic valves in the specific example, is controlled by the electric system shown in FIG. Referring to FIG. 6, the operation of the first switching valve 74 and the second switching valve 76 is switched by the changeover switch 110. To explain further, the changeover switch 110 is composed of switches selectively positioned in the first position and the second position, and when in the first position, the terminals 110A and 110B are connected as shown in FIG. The terminals 110A and 110C are connected to each other when in the second position. A power source E such as a battery is connected to a terminal 110A of the changeover switch 110 via a switch means such as a key switch 112. The key switch 112 is closed (ON) by inserting and operating a key (not shown). Power E
Is also connected to a safety switch means 114 of a safety mechanism described later via a key switch 112, and is further connected to a terminal 116A of an electromagnetic solenoid 116 (described later) via this safety switch means 114. Further, the terminal 110B of the changeover switch 110 is connected to the terminal 74A of the first changeover valve 74,
The terminal 74B of the selector valve 74 is connected to the terminal 76B of the second selector valve 76 and the terminal 116B of the electromagnetic solenoid 116, and the terminal 110c of the selector switch 110 is connected to the terminal 76A of the second selector valve 76. . A diode 118 is connected to bypass the electromagnetic solenoid 116. Therefore, as can be seen from FIG. 6, when the key switch 112 is open (OFF), the first switching valve 74 and the second switching valve 76 are deenergized to the non-acting position. On the other hand, when the key switch 112 is closed (ON), power is supplied to either the first switching valve 74 or the first switching valve 76 via the switching switch 110. That is, when the changeover switch 110 is in the first position, the first changeover valve 74 is biased and held in the operating position (at this time, the second changeover valve 76 is held in the non-operating position). ), When the changeover switch 110 is in the second position, the second changeover valve 76, instead of the first changeover valve 74, is energized and held in the operating position (at this time, the first changeover valve 74). The switching valve 74 is held in the non-acting position).

In connection with the changeover switch 110 described above, a safety mechanism for preventing danger is additionally provided. The changeover switch 110 is provided in the driver's seat of the earthmoving vehicle to which the bucket assembly 2 is attached, and is selectively positioned at the first position and the second position by being operated by the operator. The illustrated safety mechanism includes an openable / closable cover member 120 for covering the changeover switch 110, as shown in FIGS. 7-A and 7-B. The cover member 120 has a substantially rectangular parallelepiped box shape, and the lower surface thereof is open. The cover member 120 is openably and closably attached to the frame 125 of the driver's seat of the earthmoving vehicle by the hinge member 122. Therefore, the cover member 120 is closed (see FIGS. 7-A and 7-B) to cover the changeover switch 110.
It is rotatable between a position (shown by a solid line in the figure) and an open position (a position shown by a chain double-dashed line in FIG. 7-B) exposing the changeover switch 110). It is preferable to provide a biasing means such as a leaf spring that biases the cover member 120 toward the closed position. The safety mechanism further includes an opening / closing motion blocking means for blocking the opening / closing motion of the cover member 120, and in a specific example, the opening / closing motion blocking means is the electromagnetic solenoid 116 (see FIGS. 6 and 7-).
FIG. 7A and FIG. 7B) and the safety switch means 114 (FIGS. 1 and 6). Mainly referring to FIGS. 7-A and 7-B, the electromagnetic solenoid 116 has its main body portion 124 mounted on a mounting member 126 mounted on the inner surface of the frame 125. A pair of projecting pieces 128a and 128b are provided on the inner surface of the frame 125, and circular holes 130a and 130b are provided in each of the projecting pieces 128a and 128b. On the other hand, a protruding wall portion 132 is provided on one side wall of the cover member 120 (one side wall connected to the side wall to which the hinge member 122 is connected), and a circular hole 134 is also formed in the protruding wall portion 132. ing. Because it is like this,
When the cover member 120 is in the closed position (the frame 125 is formed with an elongated opening 136 through which the projecting wall portion 132 can pass in order to allow the opening / closing movement of the cover member 120), A protruding piece provided on the frame 125 through which the protruding wall portion 132 penetrates the opening 136 formed in the frame 125.
Projecting wall portion 1 of cover member 120 and holes 130a and 130b formed between projecting pieces 128a and 128b and located between 128a and 128b.
The hole 134 formed in 32 corresponds to the output shaft 13 of the electromagnetic solenoid 116.
Align with 8 axis direction. Accordingly, when the electromagnetic solenoid 116 is deenergized, the output shaft 138 of the output shaft 138 is forced to move through the hole 130a of the protruding piece 128a and the hole 13 of the protruding wall portion 132 by the force of a spring member (not shown).
4 and the hole 130b of the protruding piece 128b to penetrate into the state shown by the chain double-dashed line in FIG. 7-A (therefore, when the power supply is open (OFF), or when the wiring is disconnected, etc., When the electromagnetic solenoid 116 is energized, the output shaft 138 of the output member 138 of the cover member 120 is securely held in the closed position.
7b by retreating from the hole 130b of 8b and the hole 134 of the protruding wall 132.
The state shown by the solid line in FIG. Further, the illustrated safety switch means 114 is composed of a permanent magnet 140 and a proximity switch 142 for detecting the permanent magnet 140 (FIG. 6). The proximity switch 142 is closed (ON) by detecting the permanent magnet 140. In the specific example, as shown in FIG. 1, the permanent magnet 140 is arranged in the receiving portion 12 of the bucket 4, and the proximity switch 142 is arranged in the rod side end of the cylinder 64 of the side dump fluid pressure cylinder mechanism 8. ing.
On the contrary, the proximity switch 142 may be arranged in the receiving portion 12 of the bucket 4, and the permanent magnet 140 may be arranged in the cylinder of the fluid pressure cylinder mechanism 8 for side dump. Therefore, the side dump fluid pressure cylinder mechanism 8 is in the most contracted state (the state shown in FIG. 1), in other words, the contraction causes the first and second supported portions 14a and 14b of the bucket 4 to be supported.
As will be easily understood, each of the above is received by the first and second support portions 32a and 32b of the bucket support 6 (specifically, the substantially semicircular support surfaces defined by the support pieces 36a and 36b). The permanent magnet 140 and the proximity switch 142 are in the state of being closest to each other, and the proximity switch 142 detects the permanent magnet 140 and is in the closed state. As in the specific example, it is preferable to dispose the protective cover 149 so as to cover the receiving portion 12 of the bucket 4.

Next, mainly referring to FIG. 1, FIG. 5 and FIG. 6, the function and effect of the bucket assembly 2 described above will be described.

In FIG. 6, a key (not shown) is provided on the key switch 112.
When is inserted and operated, the key switch 112 is closed (ON). Thus, the current from the power source E is supplied to the first switching valve 74 or the second switching valve 76 via the changeover switch 110 via the key switch 112. That is, when the changeover switch 110 is in the first position (the position shown in FIG. 6, FIG. 7-A and FIG. 7-B), the current from the power source E passes through the changeover switch 110 to the first position. The first switching valve 74 is supplied to the switching valve 74, and the first switching valve 74 is positioned at the operating position (which allows the bucket 4 to be swung leftward as described later by operating the manual switching valve 72). When the changeover switch 110 is in the second position, the current from the power source E is supplied to the second changeover valve 76 via the changeover switch 110, and the second changeover valve 76 is positioned in the working position (this). Thus, by operating the manual switching valve 72, the bucket 4 can be swung to the right as will be described later). When the key switch 112 is closed, the side dump fluid pressure cylinder mechanism 8 is
Is in the shortest state, in other words, the first and second supported portions 14a and 14b of the bucket 4 are the first of the bucket support 6.
And the second switch 32a and 32b, the proximity switch 142 is closed (ON), and therefore the safety switch means 114 is in the active state, so that the power supply E is connected via this safety switch means 114. The current from the electromagnetic solenoid 116
Is supplied to. As a result, the electromagnetic solenoid 116 is energized, and the output shaft 138 of the electromagnetic solenoid 116 is retracted as described above and the seventh-A
The state shown by the solid line in the figure is reached, and the opening / closing movement blocking means is set in the non-blocking state. In such a state, as can be easily understood from FIGS. 7-A and 7-B, the electromagnetic solenoid is
The output shaft 138 of the shaft 116 is disengaged from the hole 134 of the cover member 120 to allow the cover member 120 to open and close, and is swung in the direction shown by the arrow in FIG.
The 0 can be brought to the open position shown by the alternate long and two short dashes line in FIG. 7-B. In the open position, as can be seen from FIG. 7-B, the changeover switch 110 is exposed so that the operator can change over the changeover switch 110. Then, by switching the changeover switch 110, it is possible to change the discharge direction of the earth and sand or the like stored in the bucket 4, as can be easily understood. On the other hand, the side dump fluid pressure cylinder mechanism 8 is not in the shortest state, in other words, the bucket 4 is swung in either the left or right direction as described later, and the first and second supported portions 14a and 14b of the bucket 4 are rotated.
If either one of the two is not received by the first and second support portions 32a and 32b of the bucket support 6, the proximity switch 142 is open (OFF), and thus the safety switch means 114 is in the inactive state. Therefore, the electric current from the power source E is not supplied to the electromagnetic solenoid 116. Therefore,
The electromagnetic solenoid 116 is not energized and its output shaft 138 is positioned so as to penetrate through the holes 130a and 130b of the projecting pieces 128a and 128b and the hole 134 of the cover member 120, and two points are shown in FIG. 7-A. The state shown by the chain line is held, and the opening / closing movement blocking means is kept in the blocking state. In such a state, the 7-A
As can be seen from the figure, the output shaft 138 of the electromagnetic solenoid 116 is
By this, the opening / closing movement of the cover member 120 is reliably prevented, the cover member 120 is not opened, and thus the changeover switch 110 cannot be changed over. In order to enable the changeover operation of the changeover switch 110, the side dump fluid pressure cylinder mechanism 8 may be set to the shortest state,
As a result, the safety switch means 114 is closed and the electromagnetic solenoid 116 is energized, thus allowing the cover member 120 to be opened and closed as described above, and the changeover switch 110 can be changed over. As described above, when either one of the first and second supported portions 14a and 14b of the bucket 4 is not received by the first and second support portions 32a and 32b of the bucket support 6. The switching of the discharging direction of the bucket 4 is reliably prevented, and thus the first and second supported portions 14a and 14b of the bucket 4 are prevented.
It is prevented that both of them inadvertently disengage from the first and second support portions 32a and 32b of the bucket support 6.

When the changeover switch 110 is in the first position, the earth and sand and the like stored in the bucket 4 can be discharged to the left, and when the changeover switch 110 is in the second position, the earth and sand and the like in the bucket 4 are released. Can be discharged to the right. Next, a case where the earth and sand in the bucket 4 is discharged rightward will be mainly described.

When discharging to the right (or left), changeover switch 11
In the state in which 0 is set to the second position (or the first position) as described above, the operation lever (not shown) provided in the driver's seat is operated to operate the manual switching valve 72 in the non-acting state. From the position to the first working position. Thus, as understood from FIG. 5, the fluid pressure supply passage 80 and the first fluid pressure passage 86 are communicated with each other and the fluid pressure return passage is formed.
The 84 and the second fluid pressure channel 88 are communicated with each other. At this time, the changeover switch 110 is in the second position (or the first position), the second changeover valve 76 (or the first changeover valve 74) is in the operating position, and the first fluid pressure flow path 86 And the third fluid pressure channel 90
(Or the fourth fluid pressure channel 92) is in communication with the second fluid pressure channel 88 and the fourth fluid pressure channel 92 (or the third fluid pressure channel 90). . Therefore, when the manual switching valve 72 is positioned at the first operation position, the fluid from the fluid pressure source 78 passes through the manual switching valve 72 and the first fluid pressure flow path 86 to the side dump fluid pressure cylinder mechanism 8. The second switching valve 76 (or the first switching valve 74) and the third fluid pressure channel 90 (or the fourth fluid pressure channel 92) are supplied to the extension side, that is, the head side of the cylinder 64. It is supplied to the extension side of one lock fluid pressure cylinder mechanism 44a (or the other lock fluid pressure cylinder mechanism 44b), that is, to the head side of the cylinder 48a (or 48b). On the other hand,
The fluid on the contracted side of the side dump fluid pressure cylinder mechanism 8, that is, the fluid in the rod side of the cylinder 64 is returned to the second fluid pressure flow passage 88, and the one locking fluid pressure cylinder mechanism 44a (or the other locking fluid). Contraction side of the pressure cylinder mechanism 44b),
That is, the fluid in the rod side of the cylinder 48a (or 48b) is the bypass passage 96 (or 102), the check valve 98 (or 104), the fourth fluid pressure passage 92 (or the third fluid pressure passage 90), The fluid is returned to the second fluid pressure channel 88 via the second switching valve 76 (or the first switching valve 74), and these fluids are further passed through the manual switching valve 72 and the fluid pressure return channel 84 to store the fluid pressure. Returned to 82. Thus, the one side locking fluid pressure cylinder mechanism 44a (or the other side locking fluid pressure cylinder mechanism 44b) is extended together with the side dump fluid pressure cylinder mechanism 8. When one lock fluid pressure cylinder mechanism 44a (or the other lock fluid pressure cylinder mechanism 44b) is extended, the first hook member 3
8a (or the second hook member 38b) is the shaft member 34a (or 34
It is turned counterclockwise (or clockwise) in FIGS. 1 and 4 about b) and positioned in the non-acting position shown by the chain double-dashed line in FIG. 4 (note that FIG. 8 shows 1
Shows a state in which the hook member 38a is located at the non-acting position). As a result, the hook piece 42a (or 42b) of the first hook member 38a (or the second hook member 38b) is moved to the first supported portion 14a (or the second supported portion 14b) of the bucket 4, that is, the first supported portion 14a. One pivot pin 16a (or second pivot pin 16
b) the first roller 20a (or the second roller 20)
When the bucket 4 is released, the bucket 4 can be turned, which will be described later. Further, when the side dump fluid pressure cylinder mechanism 8 is extended in the detached state, the second pivot pin 16b (or the second supported pin 14b) of the second supported portion 14b (or the first supported portion 14a) of the bucket 4 is extended. 5, the bucket 4 is swung in the clockwise direction (or counterclockwise direction) indicated by the arrow 150 in FIG. 5 as indicated by the chain double-dashed line (in FIG. 8, in the counterclockwise direction). When it is turned, it is not shown), and thus the earth and sand or the like stored in the bucket 4 is discharged to the right side (or left side) as required. During the above-described turning operation of the bucket 4, the check valve 108 (or 106) acts so that the other locking fluid pressure cylinder mechanism 44b is locked.
(Or, the supply of fluid to the extension side of one of the locking fluid pressure cylinder mechanisms 44a), that is, the head side of the cylinder 48b (or 48a) is reliably prevented, so that the other locking fluid pressure cylinder mechanism is provided. 44b (or one of the locking hydraulic cylinder mechanisms 44a) is kept in a contracted state, and the second hook member 38b (or the first hook member 38a) is connected to the hook piece 42.
b (or 42a) is attached to the second supported portion 14b (or the first supported portion 14a), that is, the second pivot pin 16b (or the first pivot pin 16a) and the second roller 20b ( Or first
Of the roller 20a) is securely held in the operating position. As described above, the side dump fluid pressure cylinder mechanism 8 extends slightly from the shortest state, in other words, when the bucket 4 turns right (or left), the bucket 4 moves.
The first supported portion 14a (or the second supported portion 14b) of the bucket support 6 is the first supported portion 32a (or the second supported portion 3) of the bucket support 6.
2b), the proximity switch 142 is opened due to the permanent magnet 140 moving away from the proximity switch 142, thus deactivating the electromagnetic solenoid 116.

In order to return the bucket 4 to the original state after discharging to the right (or to the left), the operation lever (not shown) is operated to move the manual switching valve 72 from the first operating position to the second operating position. It may be located at the working position of. Thus, as understood from FIG. 5, the fluid pressure supply passage 80 and the second fluid pressure passage 88 are communicated with each other, and the fluid pressure return passage 84 and the first fluid pressure passage 86 are communicated with each other. It At this time, the changeover switch 110 is in the second position (or the first position), and the first fluid pressure channel
86 and the third fluid pressure channel 90 (or the fourth fluid pressure channel 92) are connected to each other, and the second fluid pressure channel 88 and the fourth fluid pressure channel 92 (or the third fluid pressure channel). 90). Therefore, when the manual switching valve 72 is positioned at the second operation position, the fluid from the fluid pressure source 78 passes through the manual switching valve 72 and the second fluid pressure flow passage 88 to cause the side dump fluid pressure cylinder mechanism 8 to move. Contraction side, namely cylinder 64
Is supplied to the rod side of the second switching valve 76 (or the first switching valve 76).
Switching valve 74), the fourth fluid pressure flow passage 92 (or the third fluid pressure flow passage 90) and the first sequence valve 94 (or the second sequence valve 100), and one lock fluid pressure cylinder mechanism. 44a (or other lock hydraulic cylinder mechanism 44b)
Is supplied to the contraction side of the cylinder, that is, the rod side of the cylinder 48a (or 48b). At this time, the fourth fluid pressure channel 92
(Or the third fluid pressure channel 90) has a first sequence valve 94.
(Or the second sequence valve 100) and the fluid pressure in the fourth fluid pressure channel 92 (or the third fluid pressure channel 90) does not rise above a predetermined level, the first sequence valve 94 (or Since the second sequence valve 100) is configured so as not to open, the side dump fluid pressure cylinder mechanism 8
Of the first sequence valve 94 (for the first time after the fluid pressure in the second fluid pressure passage 88 and the fourth fluid pressure passage 92 (or the third fluid pressure passage 90) is increased after Alternatively, the second sequence valve 100) is opened, whereby the supply of the fluid to the contracting side of the one locking fluid pressure cylinder mechanism 44a (or the other locking fluid pressure cylinder mechanism 44b) is started. On the other hand, the fluid on the extension side of the side dump fluid pressure cylinder mechanism 8, that is, the fluid in the head side of the cylinder 64 is returned to the first fluid pressure flow path 86, and the one fluid pressure cylinder mechanism 44a (or the other lock fluid cylinder) is locked. Fluid pressure cylinder mechanism 44b) extension side, that is, cylinder 48a (or 48b)
Fluid in the head side of the third fluid pressure passage 90 (or the fourth fluid pressure passage 92) and the second switching valve 76 (or the first switching valve).
74) to be returned to the first fluid pressure passage 86, and these fluids are further returned to the fluid pressure reservoir 82 via the manual switching valve 72 and the fluid pressure return passage 84. Thus, first, the side dump fluid pressure cylinder mechanism 8 is contracted to the shortest state, and then the one lock fluid pressure cylinder mechanism 44a (or the other lock fluid pressure cylinder mechanism 44b) is contracted. When the side dump fluid pressure cylinder mechanism 8 is contracted, the second pivot pin 16b (or the first pivot pin 16a) of the second supported portion 14b (or the first supported portion 14a) of the bucket 4 is compressed. Bucket 4 is centered around arrow 150 (8th
Counterclockwise (or clockwise) opposite to the direction shown in
Is turned to. When the side dump fluid pressure cylinder mechanism 8 is contracted to the shortest state, that is, the state shown in FIG. 1, the first supported portion of the bucket 4 is returned as shown in FIG.
14a (or the second supported portion 14b), that is, the first roller 20a (or the second roller 20b) mounted on the first pivot pin 16a (or the second pivot pin 16b) is the bucket support 6 The first supporting portion 32a (or the second supporting portion 32b), that is, the substantially semicircular supporting surface of the supporting piece 36a (or 36b) is received as required. In addition, the side dump fluid pressure cylinder mechanism 8 is contracted to the shortest state, that is, the first supported portion 14a (or the second supported portion 14b) is moved to the first position of the bucket support 6 by the turning of the bucket 4. Support part 32a
(Or the second supporting portion 32b), the permanent magnet 1
The proximity switch 142 comes closest to the proximity switch 142, the proximity switch 142 detects this, and the closed state is established. Thus, the electromagnetic solenoid 116 is energized. After the side dump fluid pressure cylinder mechanism 8 is contracted to the shortest state as described above, the first sequence valve 94 (or the second sequence valve
When 100) is opened, one of the locking fluid pressure cylinder mechanisms 44a (or the other locking fluid pressure cylinder mechanism 44b) is then contracted. As a result, the first hook member 38a (or the second hook member 38b) is attached to the shaft member 34.
It is pivoted clockwise (or counterclockwise) in FIGS. 1 and 4 about a (or 34b), and is positioned at the working position shown in FIG. 1 and shown in solid line in FIG. In this way, the hook piece 42a (or 42b) of the first hook member 38a (or the second hook member 38b) is not attached to the bucket 4.
First supported portion 14a (or second supported portion 14b) of the first pivot pin 16a (or second pivot pin 16b)
The first roller 20a (or the second roller 20b) mounted on the
The first supported portion 14a of the bucket 4
(Or the second supported portion 14b) is securely held by the first support portion 32a (or the second support portion 32b) of the bucket support 6. Even during the above-described return operation of the bucket 4, the check valve 108 (or 106) acts so that the other locking fluid pressure cylinder mechanism 44b (or one locking fluid pressure cylinder mechanism 44a) extends, that is, the cylinder. 48b (or 48a)
The supply of fluid to the inside of the head side of the lock cylinder is surely blocked, so that the other locking fluid pressure cylinder mechanism 44b is locked.
(Or one locking fluid pressure cylinder mechanism 44a) is kept in a contracted state, and the second hook member 38b (or the first hook member 38a) has the hook piece 42b (or 42a) as the second supported portion. 14b (or the first supported portion 14a), that is, the action of engaging the second roller 20b (or the first roller 20a) mounted on the second pivot pin 16b (or the first pivot pin 16a) Holds securely in position.

When the bucket 4 is returned to the original state as described above, as shown in FIG. 1, the first and second supported portions 14a and 14b of the bucket 4, that is, the first and second pivot pins 16a. And 16b mounted on the first and second rollers 20a and 20b, respectively, are received on the first and second support portions 32a and 32b of the bucket support 6, and the first and second hook members 38a and 38b. Hook pieces 42a and 42b are attached to the first and second supported portions 14a and 14b of the bucket 4, that is, the first and second pivot pins 16a and 16b, respectively.
And second rollers 20a and 20b, and thus each of the first and second supported portions 14a and 14b of the bucket 4 respectively includes the first and second support portions 32a and 32b of the bucket support 6, respectively. Surely supported. Therefore, in this state, the bucket 4 has the first and second supported portions 14a and 14b.
It is supported by the bucket support 6 in a so-called double-supported state in which it is supported by the bucket support 6 via the. Therefore, during normal work, for example, excavation work and forward discharging work,
The bucket 4 can be held in the bucket support 6 with sufficient reliability. Due to this, it is possible to secure sufficient safety and prevent concentration of load.

As described above, in the illustrated bucket assembly 2, the bucket 4 can be swung as desired by moving the operation lever (not shown) from the both-sided state to the cantilevered state. It is possible to discharge the soil and the like stored in the bucket 4 to the side.

In the illustrated fluid pressure control system, by using the manually operated valve 72, the first switching valve 74 and the second switching valve 76, the side dump fluid pressure cylinder mechanism 8 (first
Fluid pressure cylinder mechanism) and a pair of locking fluid pressure cylinder mechanisms 44a and 44b (a pair of second fluid pressure cylinder mechanisms) can be controlled as required.

Although specific examples of the present invention have been described above, the present invention is not limited to these specific examples, and various modifications and corrections can be made without departing from the scope of the present invention.

For example, as a pair of fluid pressure cylinder mechanisms for locking in the illustrated embodiment, a biasing means such as a spring member for biasing the rod in the contracting direction with respect to the cylinder, in other words, biasing the hook member toward the working position, is incorporated. It is preferable to use a hook member so that the hook member can be securely held in the working position.

The fluid pressure control system in the illustrated embodiment can also be applied to other applications, for example, a working device having an angling blade.

<Effects of the Invention> According to the present invention, the following effects are achieved.

(1) Holding / releasing of the bucket is configured to be performed by engaging / disengaging the first and second hook members of the bucket support with the first and second rollers of the bucket. . The bucket is held in such a manner that its first and second rollers are firmly held by the first and second hook members of the bucket support. When the bucket is tilted, the engagement is released only by releasing one of the first and second hook members, which is the turning center side, from one of the first and second rollers.

As a result, problems such as breakage due to non-engagement, pin not coming off, abrasion due to looseness between the pin and the hole, etc. as in the conventional structure in which the pin is engaged with the hole are eliminated, and the pin is firmly attached and detached. Therefore, the bucket can be held / released with sufficient certainty. Therefore, the excavation work and the soil removal work of the bucket can be reliably performed, and there is no possibility of damaging the tilting pivot of the bucket, and the durability is improved.

(2) In the state where the bucket is tilted, the load on the bucket side is supported by the first and second support portions of the bucket support via the first and second rollers. The first and second hook members engage the first and second rollers in such a manner as to hold the first and second rollers and prevent their movement. That is, the load on the bucket side does not hinder the operation in which the first and second hook members engage and disengage with the first and second rollers.

As a result, the problem of incapability of being disengaged due to frictional resistance or the load of the bucket as in the conventional configuration in which the pin is engaged with the hole is solved, and the tilt pivot of the bucket is not likely to be damaged. Therefore, the earth removing work of the bucket can be reliably performed.

(3) When the bucket is returned to the horizontal position after the soil is discharged, one of the first and second hook members on the turning center side is placed in the third and fourth fluid pressure flow paths in reverse. The function of the stop valve ensures that the engaged state is maintained. The other of the first and second hook members has a function of one of the first and second sequence valves arranged in the third and fourth fluid pressure passages (the valve does not open unless the bucket returns to the horizontal position). )
Is reliably held in the disengaged state.

As a result, the tilting pivot of the bucket is prevented from being damaged due to the use of the back pressure as in the conventional pin engaging structure with the hole, and a stable and stable lowering operation of the bucket is ensured.

(4) As described above, the first and second hook members are
The load on the bucket side does not hinder the operation of engaging / disengaging the first and second rollers.

As a result, the problem that the stability of the operation (balance) is influenced by the load condition on the bucket side as in the conventional configuration in which the pin is engaged with the hole is solved, and
The disengagement can be reliably performed as desired.
Therefore, the excavation work of the bucket is surely performed, and damage to the tilting pivot of the bucket is prevented.

(5) In the fluid pressure control system, there is no need to use a bleed valve, an accumulator, a blocking valve, a compressed gas in a conduit, etc., as in the conventional configuration in which a pin is engaged with a hole. It is relatively simple and relatively inexpensive.

[Brief description of drawings]

FIG. 1 is a plan view showing a specific example of a bucket assembly constructed according to the present invention. FIG. 2 is a rear view showing a bucket support in the bucket assembly of FIG. 1. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a view for explaining the operation of the first and second hook members in the bucket assembly of FIG. FIG. 5 is a fluid pressure flow path illustrating a fluid pressure control system for actuating and controlling the bucket assembly of FIG. FIG. 6 is an electric circuit diagram for explaining control of the first and second switching valves in the fluid pressure control system of FIG. FIG. 7-A is a cross-sectional view showing a changeover switch for changing over the first and second changeover valves of FIG. 5 and the vicinity thereof. FIG. 7-B is a sectional view taken along line BB in FIG. 7-A. FIG. 8 is a view for explaining a case where the bucket body of the bucket assembly of FIG. 1 is swung to the right. 2 ... Bucket assembly 4 ... Bucket 6 ... Bucket support 8 ... Side dump fluid pressure cylinder mechanism (first fluid pressure cylinder mechanism) 10 ... Bucket body 12 ... Receiving portion 14a and 14b ... First And second supported portions 16a and 16b ... first and second pivot pins 22 ... support bodies 32a and 32b ... first and second supporting portions 38a and 38b ... first and second hooks Members 44a and 44b …… Locking fluid pressure cylinder mechanism (second fluid pressure cylinder mechanism) 62 …… Mounting part 72 …… Manual switching valve 74 and 76 …… First and second switching valve 78 …… Fluid pressure Source 80 …… Fluid pressure supply channel 82 …… Fluid pressure reservoir 84 …… Fluid pressure return channel 86 …… First fluid pressure channel 88 …… Second fluid pressure channel 90 …… Third fluid pressure channel 92 ... Fourth fluid pressure

Claims (1)

[Claims] 1. A fluid pressure control including a bucket, a bucket support mounted on an earthmoving vehicle, and a side dump fluid pressure cylinder mechanism interposed between the bucket support and the bucket support for laterally discharging the bucket. A bucket assembly for an earthmoving vehicle including a system, wherein the bucket is mounted on both rear and rear portions of the bucket, and is a first swing center of the bucket when discharged laterally.
And a second supported portion including a second pivot pin, the first and second supported portions being respectively rotatably supported by the first and second pivot pins. And the second
The bucket support has first and second supporting portions for receiving and supporting the first and second supported portions of the bucket, respectively, and the first and second supporting portions of the bucket. The engagement between the first and second rollers and the operating position for engaging the second roller to hold the first and second supported portions on the first and second supporting portions is released. First and second members mounted on the bucket support so as to be rotatable between a non-acting position for releasing the holding
And a pair of locking hydraulic cylinder mechanisms interposed between each of the first and second hook members and the bucket support, and a non-selective non-locking hydraulic cylinder mechanism. Position of action,
A manual switching valve positioned in a first operating position and a second operating position, first and second switching valves selectively positioned in a non-operating position and an operating position, respectively, and a fluid connected to a fluid pressure source. A first fluid pressure flow path connecting a pressure supply flow path, a fluid pressure return flow path connected to a fluid pressure reservoir, an extension side of the side dump fluid pressure cylinder mechanism, and the first and second switching valves. A passage, a second fluid pressure passage connecting the contraction side of the side dump fluid pressure cylinder mechanism and the first and second switching valves, and an extension side of the one locking fluid pressure cylinder mechanism and the other. A third fluid pressure flow path connecting the contraction side of the lock fluid pressure cylinder mechanism, the contraction side of the one lock fluid pressure cylinder mechanism and the expansion side of the other lock fluid pressure cylinder mechanism. A fourth fluid pressure channel, wherein the manual switching valve The first fluid pressure supply passage and the first fluid pressure passage are in communication with each other and the second fluid pressure return passage is in communication with the second fluid pressure passage, and the second fluid pressure passage is in communication with the second fluid pressure passage.
The fluid pressure supply passage and the second fluid pressure passage are communicated with each other, the fluid pressure return passage and the first fluid pressure passage are communicated with each other, and the fluid pressure supply passage is in the non-actuation position. At any time, the communication state is shut off, and the first switching valve communicates the first fluid pressure flow passage and the fourth fluid pressure flow passage when the second switching valve is in the operating position, The fluid pressure flow passage and the third fluid pressure flow passage are communicated with each other, the communication state is shut off when in the non-acting position, and the second switching valve is provided with the first fluid when in the working position. A pressure flow path and the third fluid pressure flow path are in communication with each other, the second fluid pressure flow path is in communication with the fourth fluid pressure flow path, and the communication state is cut off when in the non-acting position; The side dump fluid when the second switching valve is in the operating position and the manual switching valve is in the second operating position. As contraction of said one of the locking fluid pressure cylinder mechanism is started after the cylinder mechanism has been deflated, the fourth
A first sequence valve is disposed in the fluid pressure flow path of the side dump fluid, and the first switching valve is in the operating position and the manual switching valve is in the second operating position. The third locking fluid cylinder mechanism is configured to start contracting after the mechanism is contracted so that the third
A second sequence valve in the fluid pressure flow path of the second fluid pressure flow path when the first switching valve is in the operating position and the manual switching valve is in the second operating position. A check valve is arranged in the third fluid pressure flow passage and the second switching valve is in the working position so that the fluid pressure from the above does not act on the extension side of the one locking fluid pressure cylinder mechanism. And when the manual switching valve is in the second operating position, the fluid pressure from the second fluid pressure passage is prevented from acting on the extension side of the other locking fluid pressure cylinder mechanism. A bucket assembly for an earthmoving vehicle, in which a check valve is arranged in the fluid pressure flow path.