JPS6152017B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an outrigger device installed in a wheel-type working machine such as a truck crane, rough terrain crane, or wheel shovel.

As shown in FIGS. 6 to 8, this type of outrigger device is installed in two sets on both the front and rear sides of a traveling body A, each on the left and right sides, in an H-shaped arrangement as a whole, each with a fixed box B fixed to the traveling body A. An overhanging beam C is extended out and fitted in a retractable manner, and a retractable jack cylinder E having a float D at the lower end is fixed in a vertical position at the tip of this overhanging beam C.

However, this type of conventional outrigger device has the following problems. That is, this type of wheel-type working machine is subject to various restrictions on the body structure due to the fact that it runs on public roads. The height of the underside of the aircraft from the ground (hereinafter referred to as aircraft height) is one of them. Therefore, the jack cylinder E of the outrigger device is required to have an extension stroke that is the above body height plus a stroke for lifting the body off the ground. For this reason, the overall length of the jack cylinder E inevitably becomes long, and the amount of upward protrusion of the machine body increases accordingly. In this way, the jack cylinder protrudes above the machine for a long time, so the jack cylinder gets in the way during so-called close work such as piling work or loading work with a truck close to the machine, making the work very inconvenient. was.

Further, in order to improve the stability of supporting the fuselage, it is desirable that the overhanging beam C extends as long as possible to the outside of the fuselage. For this reason, the jack cylinder E is designed to fit completely within the legal aircraft width when the overhanging beam is retracted, but in this case, the outer half of the float D attached to the lower end of the jack cylinder E is It will protrude from within the width. Therefore, in the past, the float D was attached every time the vehicle was driven on a public road, and the work of attaching and detaching the float was extremely troublesome. Furthermore, due to the necessity of attaching and detaching the float, the float D has to be made small in order to keep the weight of the float small, which is disadvantageous in terms of the stability of supporting the aircraft body.

In view of the above points, the present invention has been developed to reduce the amount of upward protrusion of the jet cylinder, while adhering to legal restrictions, and to keep the float within the width of the machine body in the retracted state. The purpose is to obtain an outrigger device for a machine, and its configuration is as follows.

The present invention is configured such that the cylinder is pivoted to the tip of the overhang beam so as to be able to swing in the left and right directions using the upper part as a fulcrum, so that the cylinder can be drawn toward the inside of the overhang beam and stored in an inclined position. This is the basic feature, and in addition to this, the above-mentioned jack cylinder is configured to automatically change its position from the tilted retracted position to the vertical position, and vice versa, in conjunction with the expansion and contraction operation of the extending cylinder. It is characterized by the following points.

Embodiments of the present invention will be described below with reference to the drawings.

1 is a traveling body frame; 2 is a fixed box fixed to the frame 1; 3 is an overhanging beam that extends over the fixed box 2 and is fitted therein so as to be retractable; and 4 is an overhang for extending and storing the overhanging beam 3. The cylinder 5 is a jack cylinder attached to the tip of the overhanging beam 3, and 6 is a float attached to the lower end of the jack cylinder 5.

The cylinder tube 51 has a cylinder tube 51.
The rod 52 is placed at the tip of the overhang beam 3 in the opposite position to the conventional jack cylinder, with the rod 52 at the bottom and the rod 52 at the top. It is pivoted to 3. In this way, the jack cylinder 5 is attached to the tip of the overhanging beam so that it can swing in the left-right (width) direction of the aircraft with the upper part as a fulcrum, and when the outriggers are retracted, the cylinder 5 is moved from the vertical position to the upper part as shown in FIG. It is constructed so that it can be stored inside the overhanging beam 3 in an inclined position with the fulcrum being drawn toward the inside of the overhanging beam 3.

The overhang cylinder 4 connects the base end of the cylinder tube 41 to the inner surface of the fixed box 2 and the tip of the rod 42 to the inner surface of the front end of the overhang beam 3. The expansion and contraction of the overhang cylinder 4 causes the overhang beam to 3 is extended from the fixed box 2 so that it can be stored. In this case, the rod end of the overhang cylinder 4 and the overhang beam 3 are connected as follows.

That is, a bracket 43 is fixed to the rod end of the overhanging cylinder 4, and the bracket 43 is
A long hole 44 is provided along the cylinder expansion/contraction direction. On the other hand, two horizontal pins 31 and 32 on the left and right sides are fixed to the inside of the tip of the overhanging beam 3 with an interval smaller than the length of the elongated hole 44 between them.
Both pins 31 and 32 are inserted into and engaged with the elongated hole 44 so as to be movable within a certain length range. In this way, the rod 42 of the overhanging cylinder 4 is connected to the overhanging beam 3 so that it can overhang within a certain length range and can freely move (idle movement) in the storage direction.

Further, the bracket 43 fixed to the rod end of the overhanging cylinder 4 has a link mounting seat 45 fixedly provided below the bracket, and the first and second links 7.
1 and 72, and a link mounting seat 54 fixed to the tip of the rod of the cylinder 5. The first link 71 of the link mechanism 7 is formed in a dogleg shape, and its center portion is pivotally connected to the overhang beam 3 via a fixing pin 33. 2nd link 7
2 are rotatably connected to the first link 71 via a movable pin 73. Further, the first link 71 and the link mounting seat 45 are connected to the rod 4.
The first link 71 is pivotally connected via an elongated hole 46 in order to convert the linear motion of the first link 71 into a rotational motion of the first link 71.

Next, a locking means for locking the jack cylinder 5 in the vertically extended position will be explained. The cylinder tube 51 of the jack cylinder 5 has convex portions 5 on both front and rear sides from the upper end to the vicinity of the lower end.
5 is installed protrudingly. The convex portion 55 is formed in a step shape in which the outer half 55a in the width direction of the aircraft body has a larger protrusion dimension than the inner half 55b (hereinafter, the outer half 55a is a high portion, and the inner half 55b is a low portion). ). On the other hand, left and right blocks 34, 35 are fixed to both the front and rear surfaces of the tip of the overhanging beam 3, and an engagement recess 36 is formed between the blocks 34, 35. The engagement recess 36 has a width dimension that allows the high portion 55a to engage with a position facing below the high portion 55a of the convex portion 55 of the cylinder 5 when the cylinder 5 is in the vertically contracted position. It is also formed. Therefore, when the jack cylinder 5 is extended in a vertical position, the high portion 55 of the convex portion 55
a enters the engagement recess 36 from above and engages with it.

Also, to explain the structure for holding the jack cylinder 5 in the vertically contracted position, a lock pin 8 is elastically protruded and retracted into the overhang beam 3 via a compression coil spring 81 at the lower end of one side in the front and back direction of the tip of the overhang beam 3. It is held freely. A vertically long head 82 is connected to the end of the lock pin 8 that projects outside the overhang beam 3, and the head 82 is placed vertically at a predetermined interval on the outer surface of the lower part of the tip of the fixed box 2. It is locked to the outer surface of a pair of fixed cam pieces 9, 9. A slanted cam surface 91 is formed on the outer surface of this cam piece, and as the extending beam 3 moves, the head 82 of the lock pin 8 is moved toward this cam surface 91. By sliding the lock pin 8, the lock pin 8 protrudes inward from the overhang beam 3, and the tip of the lock pin 8 finally comes into contact with the lower part 55b of the convex part 55 of the jack cylinder 5 in the vertically contracted position. It consists of The abutting engagement of the lock pin 8 with the lower protrusion portion 55b prevents the jack cylinder 5 from swinging inward of the overhang beam in the vertically contracted position.

Note that cutouts 21 and 37 are provided at the lower surfaces of the distal ends of the fixed box 2 and the overhanging beam 3 to allow the jack cylinder 5 to swing. Further, in FIG. 1, 22 is a lock pin for locking the overhanging beam 3 in the retracted state, and 23 is a stopper for the beam 3 in the retracting direction. Although not shown, it is desirable for safety to provide a stopper at the base end of the overhanging beam 3 and at the distal end of the fixed box 2 for regulating the amount of overhang of the beam 3 to a constant level.

The float 6 includes pins 5 protruding from both front and rear sides of the lower end of the cylinder tube 51 of the cylinder 5.
6, and a long hole 62 provided in the float mounting seat 61
(shown in FIG. 4), which is pivotally mounted so as to be swingable in the left-right direction.

Next, the effect will be explained.

When using the outriggers, extend the overhang cylinder 4 from the state shown in FIG. 1 to extend the overhang beam 3 outward from the fuselage as shown in FIG. The aircraft is grounded and the aircraft is floated, and various operations are performed in this state.

Therefore, when the overhang cylinder 4 starts to extend when the overhang beam 3 is extended, the rod 42 of the cylinder 4 will extend the length of free movement of the pins 31 and 32 within the elongated hole 44 of the bracket 43. Move in the air (move alone) within the range, and this rod 4
During the idle movement stroke of No. 2, the link mechanism 7
By pivoting in the direction of the arrow in the figure, the jack cylinder 5 is automatically and forcibly pivoted from the tilted storage position to the vertical position shown in FIG. At this point, the pins 31 and 32 have finished their free movement within the elongated hole 44, and from this point on, the overhanging beam 3 will begin to extend.

On the other hand, when the jack cylinder 5 is in the vertical position as described above, the tip of the lock pin 8 is connected to the convex portion 55 of the jack cylinder 5, as shown in FIGS.
From this state, as the overhanging beam 3 moves, the lock pin 8 is guided by the cam surfaces 91, 91 of the cam pieces 9, 9 provided on the fixed box 2, as described above. As a result, it protrudes into the extended beam 3 and eventually comes into contact with the lower protrusion portion 55b. This allows the jack cylinder 5 to move while the overhang beam 3 is moving.
It is possible to prevent swaying movement.

After extending the overhanging beam, when the jack cylinder 5 is extended, the high portion 55a of the convex portion 55
is the engagement recess 3 formed on the inner surface of the overhang beam 3.
By engaging with the cylinder 6, the cylinder 5 is locked in a vertically extended position, and sideways shaking and falling during work are prevented.

Next, when retracting the outriggers, the jack cylinder 5 is contracted, and the overhanging beam 3 is
is pulled into the fixed box 2 and stored. At the beginning of this overhang beam retraction, the overhang cylinder 4
The rod 42 attempts to move independently in the opposite direction to when it is extended, but at this time, the jack cylinder 5 is prevented from swinging in the direction of the tilted posture by the lock pin 8, and the link mechanism 7 also moves. Since it is not activated, the overhang beam 3 starts to move simultaneously with the movement of the rod 42 of the overhang cylinder 4. and,
Before the overhang beam is completely retracted, the head 82 of the lock pin 8 touches the cam surfaces 91, 91 of the cam pieces 9, 9.
By climbing, the lock pin 8 separates from the lower convex portion 55b, and the lock of the jack cylinder 5 in the vertically contracted position is released. Therefore, from the time when the retracting of the overhanging beam 3 is completed, the rod 42 of the overhanging cylinder 4 moves independently in the opposite direction to that when the overhanging beam was extended, and during this time, the jack cylinder 5 is moved by the action of the link mechanism 7 as shown in FIG. It is automatically displaced from the vertical position shown in Figure 1 to the tilted storage position shown in Figure 1. At this time, the float 6 is in close contact with the lower surface of the fixed box 2 in a horizontal position.

In this way, when using this outrigger device in which the jack cylinder 5 is stored in the overhanging beam 3 in an inclined position when the outriggers are stored,
When the jack cylinder 5 is placed in a vertical position during use, the cylinder 5 protrudes below the overhang beam 3. In other words, the jack cylinder 5 can be made to protrude below the aircraft body to reduce the distance from the ground. Therefore, the required stroke of the cylinder 5 to float the aircraft is smaller than that of the conventional one. Therefore, the overall length of the jack cylinder 5 can be reduced accordingly. Further, by allowing the cylinder 5 to protrude downward from the machine body in a vertical position, the amount by which the cylinder 5 protrudes upward from the machine body can be made smaller compared to the conventional device.

Therefore, when using this outrigger device, the synergistic effect of the following two points is achieved: (a) the overall length of the jack cylinder 5 can be reduced; and (b) the cylinder 5 can be made to protrude downward from the fuselage. The amount of upward protrusion can be kept much smaller compared to conventional devices. Therefore, there is no fear that the jack cylinder 5 will interfere with nearby work such as piling work, unlike in the past, which is very useful for work.

On the other hand, with the outriggers retracted, the float 6
is drawn toward the overhanging beam 3 side together with the jack cylinder 5 and completely fits under the fixed box 2. In other words, the float 6 does not protrude outward from the fuselage. There is no need to remove each cylinder from the cylinder 5. Furthermore, by eliminating the need to attach and detach the float, there is no need to suppress the weight of the float 6, so the float 6 can be made as large as possible without protruding outward from the fuselage in the stored state. This makes it possible to improve the stability of the aircraft support.

In addition, when using this device, the swing displacement operation between the vertical position and the tilted storage position of the jack cylinder 5 can be automatically and forcibly performed using the expansion and contraction operation of the overhanging cylinder 4. Therefore, the reliability of this jack cylinder displacement operation is excellent, and there is no need for extra operations regarding this operation. Furthermore, since there is no need to add a dedicated drive source such as a hydraulic cylinder for this cylinder rocking displacement, the structure in this respect is simple and compact, and the cost is low.

By the way, in the above embodiment, the overhanging cylinder 4
Although two pins 31 and 32 are provided on the overhang beam 3 as projections to engage with the elongated hole 44 of the bracket 43 provided at the end of the rod, it is of course possible to use only one pin (projection). Further, the same protrusion may be provided on the overhanging cylinder 4 side, and a long hole that engages with the protrusion may be provided on the overhanging beam 3 side. Furthermore, a structure is provided in which the overhang cylinder 4 is connected to the overhang beam 3 so as to be freely movable within a certain range in the expansion and contraction direction, and a link mechanism 7 is provided which transmits the free movement of the overhang cylinder to the jack cylinder 5 as a swing displacement force. The specific structure may be changed as appropriate when implementing the present invention. Furthermore, the locking means for locking the jack cylinder 5 in the vertically extended position is not limited to the above embodiment. For example, a lock pin that can be elastically retracted from the front and back surfaces of the tip of the overhanging beam 3 is provided, and this lock pin is attached to the jack cylinder 5. It is also possible to automatically engage the locking hole provided on the 5 side, or the locking pin may be manually inserted into the locking hole provided on both the jack cylinder 5 and the overhang beam 3. good. Also,
In the above embodiment, the cylinder 5 was installed at the tip of the overhanging beam with the cylinder tube 51 on the bottom side, but of course, the cylinder 5 could also be installed with the cylinder tube 51 on the top side as in the conventional case. Good too. However, according to the above embodiment, since the rod 52 is hidden within the overhanging beam 3, it is possible to prevent damage to the rod 52, which is likely to occur in any case, as well as oil leaks and malfunctions caused by this, and also prevent locking means to be added to the cylinder 5. Since the cylinder tube 51 only needs to be processed for such purposes, the processing becomes easy.

As described above, according to the present invention, when the outriggers are retracted, the jack cylinder is drawn into the overhanging beam using the upper part as a fulcrum and is stored in the beam in an inclined position, thereby making it more advantageous than conventional outrigger devices. This makes it possible to significantly reduce the amount of upward protrusion of the jack cylinder, which is very advantageous for close work such as pile driving. In addition, since the float can be stored within the width of the machine along with the jet cylinder, there is no need to attach or detach the float every time you drive on public roads, and the float diameter can be increased to improve stability during outrigger work. It is possible.

Further, according to the present invention, the swinging displacement of the above-mentioned jack cylinder can be performed by itself by utilizing the expansion and contraction operation of the extending cylinder without using a special drive source dedicated for it, so that the structure is simplified. This is simple and inexpensive, and the cylinder rocking displacement operation is reliable and reliable.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention in a stored state; FIG. 2 is a longitudinal sectional front view showing a state in which the jack cylinder is displaced to a vertical position during use;
Figure 3 is an enlarged sectional view along the line of Figure 2;
The figures are a sectional view taken along the line of Fig. 3, Fig. 5 is a longitudinal sectional front view of the state in use, Fig. 6 is a schematic side view of the entire truck crane for explaining the conventional example, and Fig. 7 is a plan view of the same. FIG. 8 is an enlarged rear view of the same. 1... Traveling body frame, 2... Fixed box,
3... Overhanging beam, 4... Overhanging cylinder, 5
...Judge cylinder, 44...Elongated hole for freely movably connecting the overhang cylinder to the extend beam, 31, 32...Pin as a protrusion engaged with the elongate hole, 53...Judge cylinder pin as a swinging fulcrum, 6...float, 7...link mechanism.

Claims (1)

[Scope of Claims] 1. A fixed box fixed to a wheel-type traveling body, an overhanging beam overhanging and retractably fitted to the fixed box, and one end connected to the fixed box and the other end connected to the overhanging beam. The overhanging cylinder and the tip of the overhanging beam are pivoted so as to be able to swing from side to side with the upper part as a fulcrum so that it can swing between a vertical position and an inclined retracted position where the lower part is drawn into the overhanging beam. and a jack cylinder having a float at the lower end, the overhanging cylinder is connected to the overhanging beam within a certain length range and can be freely moved in the storage direction, and the overhanging cylinder is free to move relative to the overhanging beam. A wheel characterized in that the extending cylinder and the jack cylinder are interlocked and connected via a link mechanism so that the jack cylinder is oscillated from an inclined storage position to a vertical position or vice versa within a stroke. Outrigger device for type work machines. 2 A long hole is provided on one side of the overhanging cylinder and the overhanging beam along the storage direction, and a protrusion is provided on the other side.
By engaging the protrusion with the elongated hole so as to be movable in the length direction of the elongated hole, the overhanging cylinder is overhanged within the range of the elongated hole with respect to the overhanging beam, and is connected to be freely movable in the storage direction. An outrigger device for a wheeled working machine according to claim 1, characterized in that: