JPH03444Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for attaching a front loader to a tractor.

(Prior art) It is desirable that the front loader be one that can be easily attached to and detached from the tractor when necessary.
The one disclosed in No. 31364 is known. In other words, the device for attaching and detaching a front loader to an agricultural tractor disclosed in Utility Model Application Publication No. 57-31364 has a front bracket with a boss on both sides and a rear bracket with an engagement recess with a shaft lug guide piece attached to the body of the tractor. On the other hand, attach the shaft ears on both sides of the frame that connects the front loader's lift arm and lift cylinder.
A side arm is provided at the front, and a guide metal and a stand are attached to the tips of the side arms, and hydraulic pressure is used to operate the piston rod of the lift cylinder of the front loader and move the tractor forward and backward without requiring any effort. The front loader can be attached to and detached from the tractor in a short time by engaging and disengaging the loader's shaft lug with the engagement recess of the tractor's rear bracket and the front loader-shaped guide metal with the boss of the tractor's front bracket. .

However, in the front loader attachment/detachment device for an agricultural tractor disclosed in Japanese Utility Model Application No. 57-31364, when installing the front loader, the shaft lug is fitted into the engagement recess, and the positioning guide piece is attached to the boss. After making contact with the boss, a fixing pin is inserted into the pin hole of the boss and the side arm. On the other hand, when detaching the fixing pin, it is necessary to remove the fixing pin beforehand. The operator had to get out of the driver's seat each time, and the work efficiency was poor.

(Purpose of the invention) In view of the above-mentioned drawbacks of conventional devices, the object of the present invention is to provide a device for attaching a front loader to a tractor, which allows the front loader to be attached and detached from the tractor with good work efficiency. It is something.

(Structure of the invention) The present invention comprises a pair of left and right frames extending substantially in the vertical direction, a tie bar that connects the pair of left and right frames at their upper ends, a lift arm whose base is pivoted to the upper part of the frame, and the lift. a hydraulic cylinder device having one end pivotally connected to the arm, one end pivotally connected to the lower portion of the frame, and the other end pivotally connected to the lower portion of the frame; fixed,
A mounting device for attaching a front loader to a tractor, the front loader having a frame stay comprising a frame stay extending forward from the frame stay, the frame stay being mounted on either side of the front part of the vehicle body of the tractor and on one side of the rear side of the vertical part of the frame stay. A shaft is fixed on the other side, and hooks that can be engaged with the shaft are provided on the other side, and on both sides of the body part near the driver's seat and behind the front part of the body of the tractor, Irregularly shaped hooks are fixed to each of them, and irregularly shaped pins that can respectively engage with the irregularly shaped hooks are rotatably supported at the lower ends of the two frames of the front loader, and the irregularly shaped hooks include: An opening with which the pin engages is formed, and a guide groove is formed to guide the pin to the opening of the irregularly shaped hook when the tractor is moved and the irregularly shaped hook engages with the pin, and the pin is
Depending on its angular position, the tie bar can be either locked or unlocked with the odd-shaped hook, and one end of the tie bar is attached to the upper end of one of the pair of left and right frames. The tie bar is pivotably mounted so as to be rotatable between a first position located above the vehicle body and a second position located away from the top of the vehicle body, and the other end of the tie bar is configured such that the tie bar is in the first position. When the locking member is in the locked state, the other frame can be locked to the upper end of the other frame, and one of the two pins is in the locked state when the locking member is in the locked state, and the locking member is in the locked state. is rotatably connected to the locking member by a first connecting means so as to be in the unlocked state when the tie bar is in the unlocked state, and the other pin is in the unlocked state when the tie bar is in the first position. The tie bar is rotatably connected to the one end of the tie bar via a second connecting member so that the tie bar is in the unlocked state when the tie bar is in the second position.

(Embodiment) A device for attaching a front loader to a tractor according to a preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, numeral 1 indicates a tractor;
A front loader 10 is attached to this tractor 1. The tractor 1 has a vehicle body 2, and a driver's seat 3 is provided approximately in the center of the vehicle body 2. On both sides of the vehicle body 2 slightly in front of the driver's seat 3, irregularly shaped hooks 4 are provided that extend diagonally forward. This irregularly shaped hook 4 has a substantially circular opening 5 formed in its center and a guide groove 5a extending diagonally upward from this opening for the purpose to be explained later. This guide groove is open at the upper end of the hook 4. A shaft 7 is fixed to both sides of the front end of the vehicle body 2 by mounting members 6.
This shaft 7 extends laterally outward from the side of the vehicle body 2. In FIG. 1, the reference numeral 8 indicates an exhaust pipe for exhausting air from an engine (not shown).

On the other hand, the front loader 10 has a frame 11 that extends substantially vertically in a normal state, and a lift arm 1 is provided in the upper part of the frame 11.
2 is pivotally mounted at its base. This lift arm 12 extends long in front of the tractor 1, and has a cargo handling section, that is, a bucket 13, at its tip.
is installed. A bracket 14 is provided in the middle of the lift arm 12, and a double-acting hydraulic cylinder device, that is, a lift cylinder 15, which has one end rotatably attached to the lower end of the frame 11, is mounted on the bracket 14. It is rotatably attached at the other end. Therefore, by extending and contracting the lift cylinder 15, the lift arm 12 can be rotated up and down.

The bracket 14 of the lift arm 12 includes:
A link 16 extending upwardly is pivotally mounted, and this link 16 is connected to the bucket cart 13 by a link rod 17. A double-acting hydraulic cylinder device, ie, a dump cylinder 18, whose one end is pivotally connected to the frame 11, is further pivotally connected to the link 16 at the other end.
As the dump cylinder 18 expands and contracts, the bucket 13 rotates up and down. A frame stay 19 is further fixed to the frame 11, and as will be explained in detail later, when the front loader 10 is separated from the tractor 1 as shown in FIG. 10 in an upright state together with a lift arm 12 having a bucket 13 attached to the tip thereof, and a horizontal portion 19a that extends forward from the frame 11 almost horizontally, and a horizontal portion 19a that is fixed to the tip and extends approximately vertically from there. It has a vertical portion 19b extending downward in the direction.

At the lower end of the frame 11, a deformed pin 20 that can engage with a deformed hook 4 pivotally supported on the vehicle body 2 is rotatably supported by a bearing 21. This irregularly shaped pin 20 has a cylindrical shape as a whole, but for the purpose described later, a third
As shown in the figure, a cutout 20a is provided at the center of the cutout 20a to form a thin walled portion 20b. The diameter of the opening 5a of the irregularly shaped hook 4 is the same as that of the irregularly shaped pin 2.
The diameter is set slightly larger than the diameter of the irregularly shaped pin so that the pin can be engaged with the pin. The guide groove 5b of the irregularly shaped hook 4 is adapted to guide the irregularly shaped pin 20 to the opening 5a from the open portion at the upper end.
The width of the guide groove 5b is smaller than the diameter of the opening 5a, but slightly larger than the thickness of the thin portion 20b of the irregularly shaped pin 20. Therefore, after the irregularly shaped pin 20 is guided by the guide groove 5b at the thin wall portion 20b and engaged with the opening 5a, if it is rotated 90 degrees, it will not be able to come out from the opening 5a. It's getting old.
Therefore, when the front loader 10 is separated from the tractor 1, it is necessary to return the irregularly shaped pin 20 to its original angular position.

A recessed portion, ie, a hook portion 23, which can be engaged with the shaft 7 fixed to the vehicle body 2, is formed on the rear side near the lower end of the vertical portion 19b of the frame stay 19. The formation position of the hook portion 23 and the stay 19 are such that when the irregularly shaped pin 20 engages with the opening 5a of the irregularly shaped hook 4, the hook portion 23 can engage with the shaft 7. The length etc. of are selected.

In the above description, the shaft 7 is provided on the tractor side and the hook portion 23 is provided on the front loader side, but the case is reversed, that is, the shaft is provided on the front loader side and the hook portion 23 is provided on the tractor side. It is of course possible to do so.

The front loader 10 further includes the two frames 1 mentioned above in order to increase the rigidity of the front loader.
A tie bar 30 is provided to connect the two. The tie bar 30 and the link mechanisms 40 and 50 for operating the irregularly shaped pin 20 using the tie bar 30 will be described below with reference to FIG. In the following description, for convenience of explanation, the suffix a is attached to the members on the left side in the drawings, that is, when viewed from the rear of the vehicle body, and the suffix b is attached to the members on the right side, such as frames 11a and 11b. I will explain.

The tie bar 30 has the same length as the distance between the two frames 11a and 1b, and vertical members 31 and 32 extending downward are fixed to both ends thereof. The vertical member 31 is pivotally connected at its lower end to the upper end of the frame 11a by a pivot pin 33. Therefore, the tie bar 30 can rotate around this pivot pin 33 in the direction of arrow A, and has an operating position located above the vehicle body 2 of the tractor 1, as shown by the solid line in FIG. When the front loader 10 is removed from the tractor 1, it can be placed in any of the inactive positions shown by broken lines in FIG. On the other hand, the vertical member 32 has a fork-shaped portion 34 that opens downward at its lower end.
This fork-shaped portion 34 can be engaged from above with a pin 35 provided near the upper end of the frame 11b. The vertical member 32 further includes a fixing pin 3 above the fork portion 34.
On the other hand, a hook 3 as shown in FIG. 4 is attached to the pin 35 on the frame 11b.
7 is pivotally mounted, and this hook 37 moves the pin 35 between the locked position where it is hooked to the fixed pin 36 and the released position where it is released from the fixed pin as shown in FIG. It is designed to be able to rotate around. This rotation of the hook 37 is
This is done by the driver via a lever 38 provided on the hook.

The right pivot pin 20 is connected to the hook 37 via the link mechanism 40, so that when the hook 37 is in the locked position,
As shown by the solid line in FIG.
When the hook 37 is in the unlocked position while the hook 37 is in the unlocked position, the thin portion 20b of the hook 37 is in the locked position extending substantially perpendicular to the direction in which the guide groove 5b extends, as shown by the broken line in FIG. It is possible to automatically assume one of the unlocked positions extending in a direction coincident with the direction in which the lock extends.

Further, the left pivot pin 20 is connected to the vertical member 31 via the link mechanism 50, so that when the tie bar 30 is in the operating position, it assumes the locked position as described above. ,
On the other hand, when the tie bar 30 is in the non-active position,
It is now possible to take the unlocked position. With the above configuration, the hook 37 can be connected to the pin 36.
When the tie bar 30 is rotated to its inactive position, both pivot pins 20 are automatically placed in the unlocked position, and preparations for moving the tractor 1 and removing the front loader are completed. I'm starting to do that.

The attachment and detachment of the front loader 10 to the tractor 1 will be described below with reference to FIGS. 6 to 10.

During loader work, that is, when the front loader 10 is mounted on the tractor 1, the irregularly shaped pin is in the angular position shown in FIG. 6, and is in a locked state. At this time, the hook portion 23 provided on the frame stay 19 is engaged with the shaft 7.

When detaching the front loader 10 from the tractor 1, first remove the hook 37 and tie bar 3.
0 to the release position and the non-operating position, the modified pin 20 is rotated approximately 90 degrees as shown in FIG. 7, and its thin wall portion 20b is aligned with the guide groove 5b of the modified hook 4. The rotation of this irregularly shaped pin 20 is
Since this can be done by operating the hook 37 and tie bar 30 as described above, the driver can do it without getting off his seat. As a result, the irregularly shaped pin 20 becomes detachable from the hook 4. Thereafter, when the lift cylinder 15 is gradually extended, the frame 11 slides along the guide groove 5b of the hook 4 using the shaft 7 as a fulcrum, and moves forward and ascends. When the frame 11 moves forward in this way, the hook 23 comes off the shaft 7, and the front frame stay 19 descends using the rear modified hook 4 and modified pin 20 as fulcrums, as shown in FIG. Go. When the frame stay 19 descends downward in this way and the lower end of the frame stay 19 lands on the ground G as shown in FIG.
The lower end of the tractor 1, that is, the irregularly shaped pin 20, lifts up, allowing the tractor 1 to move backward. After this, when the tractor 1 is moved backward, the front loader 10 automatically separates from the tractor 1.

The front loader 10 may be attached to the tractor 1 by reversing the above order.

(Effects of the invention) In the above-described front loader attachment device to a tractor of the present invention, the front loader can be attached to a tractor by utilizing the movement of the tie bar that gets in the way when attaching and detaching the front loader to the tractor. The lock is activated and released by operating the odd-shaped pin that locks the vehicle, which makes the work extremely easy, and the driver can easily reach the front loader tractor without getting out of the seat. can be attached and detached.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a front loader and tractor equipped with a mounting device according to an embodiment of the present invention, FIG. 2 is a side view showing the front loader and tractor detached, and FIG. 4 is a rear view of the front loader seen from the rear; FIG. 5 is an explanatory diagram showing the engaged state of the odd-shaped pin and the odd-shaped hook; and FIG.
Figures 7, 8, 9 and 10 are
FIG. 3 is an explanatory diagram showing the operation of separating the front loader from the tractor. 1...Tractor, 2...Vehicle body, 3...Driver's seat,
4... Irregular hook, 7... Shaft, 10... Front loader, 11... Frame, 12... Lift arm, 15... Lift cylinder, 19... Frame stay, 20... Irregular pin, 23... Hook Part, 30... Tie bar, 37... Hook, 4
0,50...Link mechanism.

Claims (1)

[Scope of utility model registration request] A pair of left and right frames extending substantially vertically, a tie bar connecting the pair of left and right frames at their upper ends, a lift arm whose base is pivoted to the upper part of the frame, one end of which is pivoted to the lift arm, etc. a hydraulic cylinder device having one end pivotally connected to the lower portion of the frame and the other end pivotally connected to the lower portion of the frame, and a vertical cylinder having a proximal end secured to the lower portion of the frame and extending forwardly therefrom; A device for attaching a front loader to a tractor, which is equipped with a frame stay consisting of two parts, wherein a shaft is fixed to one of both sides of the front part of the vehicle body of the tractor and the rear side of the vertical part of the frame stay, and the other is provided with a hook that can be engaged with the shaft thereof, and odd-shaped hooks are fixed to both sides of the vehicle body portion of the tractor that is rearward of the vehicle body front portion and near the driver's seat, At the lower ends of the two frames of the front loader,
An oddly shaped pin that can be engaged with each of the oddly shaped hooks is rotatably supported, and each of the oddly shaped hooks has an opening in which the pin engages, and the hook can be moved to connect the oddly shaped hook and the pin. When engaged,
A guide groove is formed to guide the pin into the opening of the irregularly shaped hook, and the pin can be either locked or unlocked with the irregularly shaped hook depending on its angular position. The tie bar is pivoted at one end to the upper end of one of the pair of left and right frames, and is located between a first position located above the vehicle body and a second position located away from above the vehicle body. When the tie bar is in the first position, the other end of the tie bar can be locked to the upper end of the other frame by a locking member, and the two ends of the tie bar are rotatable. One of the pins is
the locking member is rotatably connected to the locking member by a first connecting means such that the locking member is in the locked state when the locking member is in the locked state, and the locking member is in the unlocked state when the locking member is in the unlocked state; A pin is connected to the one end of the tie bar via a second connecting member so that the tie bar is in a locked state when the tie bar is in the first position and is in an unlocked state when the tie bar is in the second position. A front loader mounting device for a tractor, characterized in that the front loader is rotatably connected.