JP4073590B2 - Outrigger backlash prevention device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a backlash prevention device for preventing backlash during storage of an outrigger such as a crane truck.
[0002]
[Prior art]
In general, an outrigger equipped on a crane truck equipped with a crane on a vehicle has a pair of left and right inner boxes detachably inserted into a hollow outer box as a base, and is attached to the outer end of each inner box. A vertical outrigger box is provided. During the work, the inner box is extended to the left and right outwards, and the vertical outrigger box is extended and grounded. When driving the vehicle, the vertical outrigger box is reduced and the inner box is stored in the outer box.
[0003]
Since there is a slight gap between the outer box and the inner box of the outrigger, play occurs in the inner box when the vehicle travels. In order to prevent backlash, the outrigger is provided with a backlash prevention device.
Conventionally, as an outrigger backlash prevention device, a spring-clamping latch is provided between an outer box and a vertical outrigger box at the outer end of the inner box. There was one that prevented the play of the inner box by suppressing the movement to the left and right (see No. 7-14099).
[0004]
However, when the crane is enlarged, the outrigger is also enlarged and the inner box is increased. Therefore, in this type of rattle prevention device, it is necessary to use a spring having a considerable amount of tightening force. If you use a latch with a small spring and insufficient tightening force, you will not be able to reliably prevent rattling and it will be fragile, and if you use a large spring to increase the size of the latch, the rattle prevention device will be extremely expensive. .
[0005]
Also, if the latch is located between the vertical outrigger box and the outer box with the outrigger extended during work, the latch will be damaged if the inner box is stored in the outer box. There are things to do.
On the other hand, a pin guide is provided in the outer box, a pin that is urged toward the inner box side by a spring is mounted in the pin guide, and a pin hole that engages the pin in the retracted state is provided in the inner box, An outrigger backlash prevention device has been proposed in which a positioning member that restricts the inward movement of the inner box by contacting the vertical outrigger box in the retracted state is provided at the outer end of the outer box (Japanese Patent Laid-Open No. 11-78813). reference).
[0006]
This backlash prevention device can reliably prevent backlash even with a large outrigger, but has a large number of parts such as a pin, a spring, and a lever or lever bracket for inserting and removing the pin, and is complicated and expensive.
In addition, when the inner box is stored, the inner box is positioned with respect to the outer box by bringing the positioning member provided at the outer end of the outer box into contact with the vertical outrigger box. Thickness adjustment is troublesome, and since an iron plate is used for the positioning member, there has been a problem that the impact and sound at the time of contact are large.
[0007]
[Problems to be solved by the invention]
The present invention solves such a problem in the outrigger backlash prevention device, has a simple structure and is inexpensive, can reliably prevent backlash and disconnection during traveling even with a large outrigger, and is stored in the inner box. An object of the present invention is to provide an outrigger backlash prevention device capable of preventing impact and sound at the time.
[0008]
[Means for Solving the Problems]
The rattle prevention device of the present invention is an outrigger in which an inner box is removably inserted into an outer box and a vertical outrigger box is provided at the outer end of the inner box. When the inner box is stored in the outer box, the outer box An elastic stopper is provided at the abutting portion where the outer outrigger box and the vertical outrigger box come into contact, a lever having a cam-type claw on either the outer box side or the vertical outrigger box side, and an inner box on the other side in the outer box The above-mentioned problem is solved by providing a receiving seat for engaging the lever claw when retracted, and providing a groove for preventing the lever claw from being detached from the receiving seat in the retracted state of the inner box.
[0009]
During operation, the outriggers release the claw of the lever from the seat and extend the inner box outward, and extend the vertical outrigger box to ground and ensure stability. When finishing the work and running the vehicle, the vertical outrigger box is reduced, the inner box is stored in the outer box, and the lever claw is engaged with the seat.
When the inner box is stored in the outer box, the outer box and the vertical outrigger box come into contact with each other, but since the stopper is provided with an elastic body at the contact portion, the impact at the time of contact is buffered and sound is Occurrence is prevented. Also, since the lever claw is provided with a groove that prevents the inner box from being detached from the seat when the inner box is retracted, the claw will not be detached from the seat during traveling, and even when a large outrigger is used, And can be reliably prevented.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a front view of an outrigger backlash preventing device according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main portion showing a state in which a hook and a seat of the backlash preventing device are engaged, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. 2, FIG. 4 is a cross-sectional view taken along the line BB in FIG. 2, and FIGS.
[0011]
Here, in the outrigger, the inner box 2 is removably inserted into the outer box 1, and the vertical outrigger box 3 is provided at the outer end portion (upper right end portion in FIG. 1) of the inner box 2. A bracket 11 is fixed to the outer end of the lower surface of the outer box 1, and a roller 17 that rolls and supports the lower surface of the inner box 2 is attached to a roller shaft 18 provided on the bracket 11. Can be easily extended and stored.
[0012]
A rubber stopper 4 is attached by a stopper mounting bolt 41 to the outer end surface of the bracket 11 which is a contact portion between the outer box 1 and the vertical outrigger box 3 when the inner box 2 is stored in the outer box 1. .
The roller shaft 18 extends to the front side of the outer box 1, and the lever 5 is attached to the front end portion thereof with a washer 51 and a nut 52. A claw 53 having a cam on the inside is provided on the outer side of the lever 5 (on the right side in FIG. 1). A protrusion 54 is formed inside the base of the lever 5 (on the left side in FIG. 1), and this protrusion 54 abuts on the bracket 11 to restrict the rotation of the lever 5 in the counterclockwise direction in FIG. A lever stopper 12 is projected.
[0013]
The vertical outrigger box 3 is provided with a seat 6 formed with a hooking hole 61 for hooking the claw 53 of the lever 5 when the inner box 2 is stored in the outer box 1. The seat 6 is fixed to the vertical outrigger box 3 with seat mounting bolts 62, but the mounting bolt holes of the seat 6 are slightly larger than the seat mounting bolts 62 so that the space between the lever 5 and the seat 6 is The relative position of can be adjusted.
[0014]
A groove 55 is formed at the base end of the claw 53 of the lever 5 to prevent the inner box 2 from being detached from the receiving seat 6 in the retracted state.
The outrigger rotates the lever 5 from the retracted state in FIG. 1 in the counterclockwise direction until the projection 54 comes into contact with the lever stopper 12 and detaches the claw 53 from the seat 6 as shown in FIG. As shown in FIG. 5, the inner box 2 is extended outward, and the vertical outrigger box 3 is extended and grounded to ensure stability.
[0015]
When the work is finished and the vehicle is driven, the vertical outrigger box 3 is reduced and the inner box 2 is stored in the outer box 1. At this time, the inner box 2 is pushed from the state of FIG. 5 into the outer box 1 as shown in FIG. 6, and the vertical outrigger box 3 is brought into contact with the stopper 4. Since the rubber stopper 4 is provided at the contact portion, the impact at the time of contact is buffered and the generation of sound is prevented.
[0016]
Next, the lever 5 is rotated clockwise to insert the claw 53 into the engagement hole 61. Since the inside of the claw 53 is a cam, the seat 6 is pulled toward the bracket 11 until the claw 53 comes into contact with the end surface of the engagement hole 61 as shown in FIG. The vertical outrigger box 3 compresses the stopper 4.
When the lever 5 is further rotated in the clockwise direction, the groove 55 at the base end portion of the claw 53 is engaged with the receiving seat 6 to be in the retracted state shown in FIG. In the retracted state, since the stopper 4 is compressed, the vertical outrigger box 3 is held in close contact with the outer box 1 side by the elastic restoring force of the stopper 4 so as not to be loose. Therefore, the claw 53 is not detached from the seat 6 during traveling, and it is possible to reliably prevent backlash and disconnection during traveling.
[0017]
Even if the outrigger is enlarged, by appropriately changing the deformation amount of the stopper 4 by adjusting the position of the receiving seat 6, the number of the stoppers 4, the hardness of the stopper 4, etc., it is possible to secure an appropriate holding force and prevent rattling.
Also, when the inner box 2 is in the retracted state where the claw 53 of the lever 5 is engaged with the receiving seat 6 and the vertical outrigger box 3 is extended and grounded with a jack (not shown), the outer box 1 and the inner box 2 Even if the vertical outrigger box 3 moves upward with respect to the outer box 1, the load is dispersed by the elastic deformation of the stopper 4 and the rotation of the lever 5, so that the breakage occurs. There is nothing.
[0018]
FIG. 10 is a front view of an outrigger backlash prevention device according to another embodiment of the present invention.
Here, the lever 5 is provided on the vertical outrigger box 3 side with the lever shaft 56, and the lever stopper 12 is also provided on the vertical outrigger box 3 side. The seat 6 is provided on the outer box 1 side. Other configurations are the same as those of the backlash prevention device of FIG. 1, and the backlash prevention function is also the same.
[0019]
As described above, in the outrigger backlash prevention device of the present invention, the lever 5 may be provided on either the outer box 1 side or the inner box 2 side. It is also possible to provide the stopper 4 on the vertical outrigger box 3 side.
FIG. 11 is an enlarged view of a main portion showing a partially cross-sectional view of the engagement between the claw and the receiving seat of the rattle prevention device provided on the outrigger provided with the roller position adjusting mechanism, and FIG. It is.
[0020]
The roller position adjusting mechanism 7 has the roller shaft mounting hole 19 of the bracket 11 as a long hole, an adjustment bolt 71 for moving the roller shaft 18 up and down, and adjusting the height of the roller shaft 18, thereby adjusting the outer box 1. And the inner box 2 are adjusted.
The lever 5 is attached to the roller shaft 18 and the seat 6 is attached to the vertical outrigger box 3. When the height of the roller shaft 18 is adjusted, the height of the vertical outrigger box 3 relative to the outer box 1 together with the inner box 2 changes. However, since the lever 5 is attached to the roller shaft 18, the relative positional relationship between the lever 5 and the receiving seat 6 does not change. Therefore, even if the gap between the outer box 1 and the inner box 2 is adjusted, the lever There is no need to readjust the mounting positions of the seat 5 and the seat 6.
[0021]
【The invention's effect】
As described above, the backlash prevention device for an outrigger according to the present invention can reliably prevent backlash, has a simple structure that is not easily broken, is inexpensive, and can easily cope with an increase in the size of the outrigger. In addition, it can prevent impact and sound when storing the inner box. [Brief description of the drawings]
FIG. 1 is a front view of an outrigger backlash prevention device according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a main part, partially showing a cross-sectional view of a hooked state between a claw and a seat of a rattle prevention device.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along line BB in FIG.
FIG. 5 is an explanatory diagram of the operation of the rattle prevention device.
FIG. 6 is an explanatory diagram of the operation of the rattle prevention device.
FIG. 7 is an explanatory diagram of the operation of the rattle prevention device.
FIG. 8 is an explanatory diagram of the operation of the rattle prevention device.
FIG. 9 is an explanatory diagram of the operation of the rattle prevention device.
FIG. 10 is a front view of an outrigger backlash prevention device according to another embodiment of the present invention.
FIG. 11 is an enlarged view of a main part, partially showing a cross-sectional view of a hooked state of a claw and a receiving seat of a rattle prevention device provided on an outrigger equipped with a roller position adjusting mechanism.
12 is a cross-sectional view taken along the line CC of FIG.
[Explanation of symbols]
1 Outer box 2 Inner box 3 Vertical outrigger box 4 Stopper 5 Lever 6 Receiving seat 7 Position adjustment mechanism 11 Bracket 12 Lever stopper 17 Roller 18 Roller shaft 19 Roller shaft mounting hole 53 Claw 54 Projection 55 Groove

Claims (1)

In an outrigger in which the inner box is removably inserted into the outer box and a vertical outrigger box is provided at the outer end of the inner box, the outer box and the vertical outrigger box abut when the inner box is stored in the outer box. An elastic stopper is provided at the abutment, and a lever with a cam-type claw on either the outer box side or the vertical outrigger box side is engaged with the lever claw when the inner box is stored in the outer box on the other side. An outrigger backlash prevention device characterized in that a receiving seat is provided, and a groove is provided in the lever claw to prevent the lever from being detached from the receiving seat when the inner box is retracted.

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