JP2007203906A - Load deck elevating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load deck elevating device capable of easily releasing lock even when pressure oil of a hydraulic circuit device is leaking and smoothly using a load deck. <P>SOLUTION: This load deck elevating device for supporting unloading work of a load onto a loading space 1 of a vehicle comprises: the load deck 5 elevating from the ground to a floor surface height of the loading space 1, a hydraulic cylinder 6 raising/lowering the load deck 5; a lock device 10 having a hook 11 and fixed on the loading space 1 and formed with a locking groove portion 11a and a lock handle 12 fixed on the load deck 5 and fitted with the locking groove portion 11a of the hook 11 and retaining the load deck 5 in a standing posture; a stopper 17 fixed on the loading space 1; and a guide member 13 disposed so that a gap S2 to the stopper 17 may become smaller than a gap dimension S1 between the locking groove portion 11a of the hook 11 and the lock handle 12 when the load deck 5 fixed on the receiving deck 5 is in a standing posture. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a load receiving table elevating device that moves up and down between a loading platform of a vehicle and the ground.

  The load receiving platform lifting / lowering device lifts and lowers the load receiving platform between the floor height of the loading platform of the vehicle and the height of the ground, and assists loading and unloading work such as luggage on the loading platform. In this kind of load receiving platform elevating device, when traveling without using the load receiving stand, the load receiving platform is configured such that it is along the inner wall or the outer wall of the door of the loading platform including the container, or constitutes a part of the side wall of the loading platform. Some stand upright vertically.

  In such a load receiving platform lifting device that raises the load receiving stand when not in use, the lock device that normally prevents the load receiving stand in the standing posture from falling down by hooking the lock handle provided on the load receiving stand to the hook provided on the load receiving stand is safe. (Patent Document 1, etc.).

JP 2005-104377 A

  However, it is usual for the load receiving table elevating device to move the load receiving table up and down by a hydraulic circuit device using a hydraulic drive device such as a hydraulic cylinder. Therefore, even when the cargo cradle is not used, the hydraulic circuit device is loaded with a weight such as the cargo cradle. If the load cradle is not used for a long period of time, a small amount of hydraulic oil leaks to the check valve due to the weight of the cargo cradle. There is a case. As a result, when the load receiving platform descends in an upright position and the lock handle of the locking device comes into contact with the hook, a part of the weight of the lifting part including the load receiving table is placed on the hook via the lock handle. There is a possibility that the locking device cannot be smoothly released due to the pressing force acting between the lock handle and the hook when the load receiving platform is used.

  The present invention has been made in view of the above, and it is an object of the present invention to provide a load receiving platform lifting device that can be easily unlocked even when there is a leak of pressure oil in a hydraulic circuit device and can smoothly use the load receiving platform. Objective.

  (1) In order to achieve the above object, the present invention is a load receiving platform lifting / lowering device for supporting a loading / unloading operation of a load on a vehicle loading platform, which lifts and lowers between the height of the loading platform floor surface of the vehicle from the ground. A load receiving platform that rotates with respect to the loading platform and rises from a substantially horizontal state to a substantially vertical state, a hydraulic drive device that raises and lowers the loading platform, and a hook that has a groove portion in a fixed relationship with the loading platform, And a locking device that has a locking handle that is in a fixed relationship with the load receiving base and engages with the groove portion of the hook, and that holds the load receiving stand in an upright position, and a first fixed relationship with respect to the loading base. When the load receiving stand is in a standing posture, the gap between the block and the first block is smaller than the gap between the hook groove and the lock handle. like Characterized in that a second block that has been set.

  (2) In order to achieve the above object, the present invention also provides a load receiving platform lifting device for supporting a loading / unloading operation of a load on a vehicle loading platform, a column fixed to the loading platform, and a vertical guide guided by the column. And a slider that is pivotably attached to the slider and moves up and down between the height of the loading platform floor of the vehicle from the ground, and is rotated with respect to the loading platform from a substantially horizontal state. A load receiving stand that stands in a substantially vertical state, a hydraulic drive device that raises and lowers the slider, and a lock device that holds the load receiving stand in a standing posture, wherein the locking device is in a fixed relationship with the load stand and has a groove portion. A support shaft attached to a side portion of the load receiving base so as to be able to advance and retreat in the width direction of the load receiving table, and an operation portion provided at a tip end portion of the support shaft, with respect to the groove portion of the hook Engage A first handle in a fixed relationship with respect to the loading platform, and a fixed relationship with respect to the loading platform, and when the loading platform is in a standing posture, a gap between the first block and the first block is And a second block disposed so as to be smaller than the gap between the groove and the support shaft of the lock handle.

  (3) In the above (2), preferably, the second block is a guide member that guides a movement of a support shaft of the lock handle inserted through the second block, and the second block is located on a side of the load receiving platform. The first block is fixed to the surface of the hook on the load receiving side.

  According to the present invention, when the load receiving stand is in the standing posture, the first block is provided before the lock handle comes into contact with the hook even if the stand in the standing posture is lowered due to leakage of pressure oil or the like. However, even if there is a leak of pressure oil in the hydraulic circuit device, the lock device can be operated and unlocked easily, so that the load receiving platform can be used smoothly.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a rear view of a vehicle equipped with a load receiving table lifting apparatus according to an embodiment of the present invention.
As shown in FIG. 1, the load receiving platform lifting device of the present embodiment includes a pair of left and right posts (posts) 2 fixed and erected on both sides in the width direction of the rear end portion of the vehicle loading platform 1. The sub-post 3 slidably inserted in the post 2, the slider 4 inserted in the sub-post 3 so as to freely move up and down, and the left and right sliders 4 are supported rotatably about the shaft 4 a. And a receiving platform 5.

  A hollow steel material or the like is used for the post 2, and the sub-post 3 inserted in the post 2 can slide in the vertical direction. The slider 4 inserted into the sub post 3 so as to be movable up and down slides up and down together with the sub post 3 or by being guided by the post 2 alone. As a result, the load receiving platform 5 supported by the slider 4 can be moved up and down.

2 and 3 are perspective views of the rear part of the loading platform 1.
As shown in FIG. 2, the load receiving platform lifting device of the present embodiment is provided at the rear end portion of the vehicle loading platform 1, and when the load receiving platform 5 is not used, the load receiving platform 5 erected substantially vertically. Constitutes the rear side wall (tailgate) of the loading platform 1 (see FIG. 2). Also, as shown in FIG. 3, the load receiving platform 5 when it is rotated with respect to the slider 4 and horizontally deployed is used as a stepper for the load or the operator when loading and unloading the load. It moves up and down according to the operator's operation between the height and the height of the ground.

  The raising / lowering operation of the load receiving platform 5, the slider 4 and the sub post 3 uses a hydraulic drive device as a drive source. In this embodiment, a hydraulic cylinder 6 (see FIG. 3) is used as the hydraulic drive device. The hydraulic cylinder 6 expands and contracts by pressure oil from a hydraulic pump (not shown), and is accommodated horizontally in a cross member 7 that is horizontally stretched between the left and right posts 2. In the present embodiment, the cross member 7 is disposed at a position continuous with the rear end portion of the floor surface of the loading platform 1, but the disposed position may be lowered to serve also as a bumper. In the present embodiment, a connecting member 8 (see FIG. 1) is separately provided between the lower ends of the posts 2.

  One end of the hydraulic cylinder 6 is fixed to a cross member 7 (internal structure), and a pulley (not shown) is connected to the other end. A wire (not shown) having one end fixed to the cross member 7 is passed through the post 2 and connected to the slider 4 via a plurality of pulleys (not shown) including the pulley. Accordingly, when the hydraulic cylinder 6 is contracted and the wire is fed out from the cross member 7 side into the post 2, the slider 4 is lowered, and the sub post 3 and the load receiving platform 5 are lowered at the same time. Conversely, when the hydraulic cylinder 6 is extended and the wire is pulled toward the cross member 7, the load receiving platform 5 rises from the ground to the highest position substantially the same as the floor surface of the loading platform 1 by the reverse operation. However, there is also a high lift type load receiving platform lifting device in which the load receiving platform 5 rises to a position higher than the floor surface of the loading platform 1, and there is no particular problem even if it is replaced with a high lift type load receiving platform lifting device.

  Further, the load receiving table lifting device is provided with a lock device 10. The lock device 10 is provided on both sides in the width direction (left and right both sides in FIG. 1) of the load receiving table 5 and holds the load receiving table 5 by restricting the rotational movement of the load receiving table 5 in the standing posture. . However, if sufficient safety can be ensured only on one side, the locking device 10 may be omitted.

4 is a view of the locking device 10 on one side as viewed from the rear side of the vehicle, and FIG. 5 is a view of the locking device 10 as viewed from the side of the vehicle.
4 and 5, the lock device 10 includes a hook 11 and a lock handle 12 that engages the hook 11 when locked.

  The hook 11 has a proximal end fixed to the post 2 and has a fixed relationship with the loading platform 1, and has a hooking groove 11 a at the tip.

  On the other hand, the lock handle 12 is composed of a support shaft 12a and a handle portion 12b as an operation portion provided at a predetermined angle (almost right angle in this example) with the support shaft 12a. It is bent into an approximate L shape. Since the support shaft 12a is fixed to the side of the load receiving platform 5 and is inserted through a guide member 13 having a fixed relationship with the load receiving platform 5, the lock handle 12 is guided by the guide member 13 in the width direction of the load receiving platform 5. The handle portion 12b is rotatable about the support shaft 12a as a rotation shaft.

  A male screw is cut at the end of the portion of the support shaft 12a located on the inner side of the load receiving platform 5 (the side opposite to the handle portion 12b), and a nut 15 is screwed there, and the support shaft 12a is passed through the inside. A spring 16 is sandwiched between the nut 15 and the guide member 13. Therefore, the lock handle 12 is urged by the spring 16 in a direction to draw the handle portion 12b toward the load receiving platform 5 side.

  At this time, the guide member 13 has a U-shaped opening that is open in the same direction as the guide portion 13 a having an insertion hole (not shown) for inserting the support shaft 12 a of the lock handle 12 and the hooking groove portion 11 a of the hook 11. Holding part 13b. In the case of the present embodiment, the “opening direction” of the latching groove portion 11a and the holding portion 13b is the tip direction of the load receiving platform 5, that is, the upward direction when the load receiving platform 5 is in the standing posture as shown in FIG. The holding portion 13b is located closer to the handle portion 12b of the lock handle 12 than the guide portion 13a. When the handle portion 12b faces the tip of the load receiving platform 5, the handle portion 12b is urged by the urging force of the spring 16. The holding portion 13b enters the U-shaped groove, and the rotation of the handle portion 12b is restricted by the inner wall surface of the groove. Even when the load receiving platform 5 is locked in the standing posture (when the handle 12 is hooked on the hook 11), the handle groove portion 11a and the holding portion 13b are opened in the same direction. By being rotated and directed upward, the engagement with the latching groove 11a is released, and it enters the U-shaped groove of the holding part 13b as it is.

The most significant feature of the present embodiment is the configuration of the locking device 10 described next.
6 is a side view of the hook 11 viewed from the outside in the width direction of the load receiving platform 5, FIG. 7 is a plan view viewed from the upper side in FIG. 6, and FIG. 8 is a front view of the hook 11 viewed from the left side in FIG. is there.
As shown in FIGS. 6-8, the stopper 17 is being fixed to the side surface at the side of the load receiving stand 5 of the hook 11 as a 1st block. On the other hand, in the present embodiment, the guide member 13 (particularly the guide portion 13a) comes into contact with the stopper 17 which is the first block when the stand 5 is about to descend. It functions as a second block that restrains the descending movement of.

  The positional relationship between the stopper 17 and the guide member 13 is a positional relationship that opposes the operation direction of the load receiving table 5 by the hydraulic cylinder 6 that is a hydraulic drive device. When the load receiving table 5 is in the standing posture, the operation of the load receiving table 5 is performed. The guide member 13 is disposed on the upper side in the direction and the stopper 17 is disposed on the lower side. That is, in the present embodiment, the load receiving platform 5 is moved in the vertical direction by the hydraulic cylinder 6, so that the stopper 17 is positioned directly below the guide member 13 when the load receiving platform 5 is in the standing posture. Just do it.

  Further, the distance dimension S2 between the lower surface of the guide member 13 and the upper surface of the stopper 17 (that is, the surfaces facing each other) is set so that the hook groove 11a of the hook 11 and the support shaft of the lock handle 12 when the load receiving base 5 is in the standing posture. It is set to be smaller than the gap dimension S1 between 12a.

  The stopper 17 is formed with a tapered or arcuate cutout portion 17a along the trajectory of the guide member 13 having the shaft 4a as a rotation center. The hook 11 is bent in a generally S shape when viewed from above so that a tip end portion 11c having a latching groove portion 11a is offset to the load receiving platform 5 side with respect to a base portion 11b fixed to the post 2. . Since the stopper 17 is fixed to the distal end portion 11c where the distance in the width direction of the load receiving platform 5 with respect to the guide member 13 is short with respect to the base portion 11b, the function of preventing the lowering of the load receiving platform 5 is achieved together with the guide member 13 which is the counterpart member. It is not necessary to make the stopper 17 thicker than necessary. Further, the tip portion 11c of the hook 11 is bent in a direction in which the upper portion thereof is separated from the load receiving platform 5, and the interference with the guide member 13 when the load receiving platform 5 shifts to the standing posture is surely avoided. It has come to be.

Next, the operation and action of the load receiving table lifting / lowering device of the present embodiment having the above configuration will be described.
When the load receiving platform 5 is at a predetermined vertical position (lock position), the load receiving platform 5 is raised and raised, the lock handle 12 is pulled out to the hook 11 side, and the handle portion 12b is rotated downward. The support shaft 12a is hooked on the hooking groove portion 11a of the hook 11 to lock and hold the load receiving platform 5 in the retracted vertical position. Thereby, safety | security is ensured so that rotation around the axis | shaft 4a of the load receiving stand 5 may be controlled, and the load receiving stand 5 may not fall down during driving | running | working. When the load receiving platform 5 is used, on the contrary, the handle portion 12b is rotated upward to release the hooking portion 11a from the hooking groove portion 11a, and the lock handle 12 is moved to the load receiving table 5 side. As a result, the load receiving platform 5 can be rotated about the shaft 4a, so that the load receiving platform 5 is horizontally deployed and lifted by the hydraulic cylinder 6 during the cargo handling operation.

  Here, since the load receiving platform 5 is lifted and lowered by the hydraulic cylinder 6 in the present load receiving platform lifting / lowering device, even when the load receiving platform 5 is not used, the weight of the load receiving platform 5, the sub-post 3, the slider 4, etc. is applied to the hydraulic circuit device. This load is received by a check valve (check valve) provided in the middle of the hydraulic piping of the hydraulic circuit device. That is, when the load receiving platform 5 is not used, the hydraulic circuit is closed so that the vertical movement of the load receiving platform 5 or the like is restricted by the holding force of the pressure oil.

  However, if the period in which the load receiving platform 5 is not used continues, there may be a case where a minute pressure oil leaks to the check valve due to the weight of the load receiving stand 5 or the like. As a result, when the load receiving platform 5 is lowered in the standing posture and the lock handle 12 (support shaft 12a) of the locking device 10 comes into contact with the hook 11 (holding groove portion 11a), the load receiving platform 5, the slider 4, the sub post 3 and the like are moved. A part of the weight of the lifted part including the lift part is applied to the hook 11 via the lock handle 12, and the operation is heavy due to the pressing force acting between the lock handle 12 and the hook 11 when the load receiving base is used next time. There is a possibility that the lock device 10 cannot be released smoothly.

  On the other hand, in the present embodiment, when the load receiving stand 5 is in the standing posture, the load receiving stand 5 is separated by a gap dimension S2 smaller than the gap dimension S1 between the support shaft 12a of the lock handle 12 and the hooking groove portion 11a of the hook 11. If the stopper 17 having a fixed relationship with the loading platform 1 is disposed directly below the guide member 13 having a fixed relationship with the loading table 1, even if the loading platform 5 in the standing posture is lowered due to a leak of pressure oil or the like, The guide member 13 abuts against the stopper 17 before the lock handle 12 contacts the hook 11. Therefore, it is possible to prevent an extra force from acting between the handle portion 12b and the hook 11, and the lock handle 12 can be maintained in a free state. Therefore, even if there is a leak of pressure oil in the hydraulic circuit device, the present cargo cradle lifting device can be easily unlocked by operating the lock device 10, so that the cargo cradle 5 can be used smoothly. .

The present embodiment described above is merely an embodiment of the present invention, and the present invention is not limited to this, and various designs can be made without departing from the technical idea thereof. It can be changed.
For example, in the above-described embodiment, the guide member 13 is also used as the “second block” in order to reduce the number of parts and simplify the configuration, and the stopper 17 that is the “first block” is provided inside the hook 11. Although the first block and the second block are integrally formed with the lock device 10, the first block and the second block may be provided separately from the lock device 10 as a stopper that functions independently. . For example, the “second block” is provided on the moving body side such as the load receiving platform 5, the slider 4, the sub-post 3, etc., and the gap dimension is set when the load receiving platform 5 is in a standing posture with respect to the stationary side which is a component other than the moving body side. The “first block” may be provided so as to be positioned below with a gap dimension S2 smaller than S1. In this way, separately from the locking device 10, it is also conceivable to provide “second block” and “first block” on the mutually opposing surfaces of the stand 5 and the post 2, respectively. Further, the present invention is also applicable to a load receiving table lifting device in which the sub post 3 is not provided and the slider 4 is provided directly in the post 2 so as to be lifted and lowered. In this case, the same effect can be obtained.

  In addition, although the case where the present invention is applied to the load receiving platform lifting device in which the load receiving platform in the standing posture constitutes the tail gate of the vehicle loading platform has been described as an example, the present invention is also applied to other types of load receiving platform lifting devices. Applicable. For example, the present invention can also be applied to a structure in which a load receiving stand when not in use is erected along the outer wall portion of the gate or door behind the load carrier including the container. Moreover, when attaching to a container, a cargo receiving platform raising / lowering apparatus may be attached not to the outer wall part of a door but to an inner wall part. In addition to the rear of the loading platform, the loading platform lifting device may be attached to the side of the loading platform. In these cases, the same effect can be obtained by applying the present invention.

  Furthermore, not only those that raise and lower the load receiving table with wires, but also load receiving device lifting and lowering devices that move the load receiving table up and down by an arm that moves up and down with the extension operation of the hydraulic cylinder, the weight of the load receiving table etc. is hydraulic when not in use. Apply to the circuit device. In this way, the load receiving platform is lifted and lowered by using a hydraulic drive device such as a hydraulic cylinder / hydraulic motor as a power source, and the other weight of the load receiving platform lifting device is applied to the hydraulic circuit device when its own weight is not used. In addition, the present invention is applicable, and similar effects can be obtained.

It is the figure which looked at the vehicle provided with the cargo receiving stand raising / lowering device which concerns on one embodiment of this invention from back. It is a perspective view showing the whole structure of the cargo receiving stand raising / lowering apparatus which concerns on one embodiment of this invention. It is a perspective view showing the whole structure of the cargo receiving stand raising / lowering apparatus which concerns on one embodiment of this invention. It is the figure which looked at the locking device with which the goods receiving base raising / lowering device which concerns on one embodiment of this invention was equipped from the vehicle back side. It is the figure which looked at the locking device with which the load receiving table raising / lowering device which concerns on one embodiment of this invention was equipped from the vehicle side. It is the side view which looked at the hook with which the load receiving table raising / lowering device which concerns on one embodiment of this invention was equipped was seen from the width direction outer side of the load receiving stand. It is the top view which looked at the hook with which the load receiving table raising / lowering device which concerns on one embodiment of this invention was equipped from the upper side in FIG. It is the front view which looked at the hook with which the consignment raising / lowering device which concerns on one embodiment of this invention was equipped from the left side in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Loading platform 2 Post 4 Slider 5 Loading platform 6 Hydraulic cylinder 10 Locking device 11 Hook 11a Hatching groove portion 12 Lock handle 12a Support shaft 12b Handle portion 13 Guide member 17 Stopper S1 Gap size S2 Gap size

Claims (3)

In the loading platform lifting device that supports the loading and unloading work of the load on the loading platform of the vehicle,
A load receiving platform that moves up and down between the floor height of the loading platform floor of the vehicle from the ground, and that rotates with respect to the loading platform and rises from a substantially horizontal state to a substantially vertical state;
A hydraulic drive for raising and lowering the load receiving table;
A lock device having a hook in a fixed relationship with the loading platform and having a groove, and a lock handle in a fixed relationship with the loading platform and engaging with the groove in the hook, and holding the loading platform in an upright position When,
A first block in a fixed relationship with the cargo bed;
Arranged so that the gap with the first block is smaller than the gap between the groove of the hook and the lock handle when the load holder is in a standing position and is in a fixed relationship with the load holder. And a second receiving block. In the loading platform lifting device that supports the loading and unloading work of the load on the loading platform of the vehicle,
A post fixed to the loading platform;
A slider that is guided by this column and slides up and down,
The slider is attached to the slider so as to move up and down between the height of the loading platform floor of the vehicle from the ground, and rotates with respect to the loading platform and rises from a substantially horizontal state to a substantially vertical state. A receiving platform to
A hydraulic drive for raising and lowering the slider;
A lock device that holds the load receiving stand in a standing posture, and the lock device includes:
A hook in a fixed relationship with the cargo bed and having a groove;
A lock handle that has a support shaft attached to a side portion of the load receiving table so as to be able to advance and retreat in the width direction of the load receiving table, and an operation portion provided at a tip portion of the support shaft, and engages with a groove portion of the hook. When,
A first block in a fixed relationship with the cargo bed;
When the load receiving stand is in a standing posture with respect to the load receiving stand, the gap with the first block is smaller than the gap size between the groove of the hook and the support shaft of the lock handle. And a second block disposed on the load receiving platform lifting device.   3. The load receiving table lifting apparatus according to claim 2, wherein the second block is a guide member that guides a movement of a support shaft of the lock handle inserted through the second block, and the second block is disposed on a side portion of the load receiving table. The first and second blocks are fixed to the surfaces of the hooks on the side of the cargo cradle, respectively.

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