JPH0659138U - Safety equipment for lifters of lorries - Google Patents

Abstract

(57) [Summary] [Purpose] The lock state of the mechanism that automatically folds the lifter platform is released each time the platform is folded. A platform 6 connected to a pair of lifting runners 5 can be switched between a sideways posture capable of abutting a turning guide 9 fixed to a raising / lowering post 3 capable of raising and lowering and a standing posture not capable of abutting. , In the sideways posture, the sliding arm 10 that slides on the turning guide 9 that is being raised while the platform 6 is rising and tilts together with the platform 6, and moves to the lock position that locks the sliding arm 10 in the sideways state. A lock member 18 that is operated dynamically and retracts to its unlocked position by its own weight is attached, and the locked state of the sliding arm 10 is automatically released by the time the folding of the platform 6 is completed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a safety device for preventing a erroneous operation when a platform is automatically folded in a lifter of a lorry used for cargo handling work.

[0002]

[Prior art]

 In a conventional lifter for a freight vehicle, for example, as shown in FIG. 6, an arm 51 pivotally supported by a base end portion of a platform 50 is attached to a guide member 53 attached to a fixed post 52 fixed to a bed while the arm 51 is being raised. A method has been adopted in which the platform 50 is slid in an upright position by tilting the platform 50 upward by bringing the platform 50 into contact with and sliding the platform 50.

[0003]

[Problems to be solved by the device]

 In the lifter described above, when the platform 50 is stored, the time during which the arm 51 is in contact with the guide member 53 is shortened, the tilting time of the platform is shortened, and the platform is rapidly folded. When the inclination angle of the contact surface of the guide member 53 is made gentle and the length of the guide member 53 is made long, the tilting speed of the platform 50 becomes slow, but in that case, the mounting position of the guide member 53 becomes low. There is a problem that the mounting space for the guide member 53 is enlarged. Also, the arm 51 is locked in a state of protruding from the platform 50 and folded while raising the platform 50, then the platform 50 is unfolded and lowered, and then the platform 50 is raised again for loading work. If the user forgets to release the lock of the arm 51, the platform 50 will be folded with the load placed on it, causing the load to roll over. An object of the present invention is to solve the above problems and to provide a safety device for a lifter of a freight vehicle that automatically unlocks the locked state of the platform folding mechanism every time the platform is folded.

[0004]

[Means for Solving the Problems]

 The safety device in the lifter of a lorry according to the present invention includes a pair of lifting runners arranged in parallel so as to be able to move up and down, and a platform that is tiltable and horizontally expandable and foldable in an upright position. It is possible to switch between a posture in which it can contact the turning guide installed in the vicinity of the hoistway so that it can move up and down, and a posture in which it cannot touch. A sliding arm that slides on the turning guide along the way and tilts in the folding direction together with the platform, and can move to a locking position where the sliding arm locks in a posture capable of abutting the turning guide. Then, a lock member that can be retracted by its own weight is attached to a lock release position for releasing the locked state.

[0005]

[Action]

 Move the sliding arm attached to the platform connected to the lifting runner that can move up and down to a position where it can contact the turning guide installed near the hoistway of the lifting runner and move it to the locked position. When the platform is raised in the state of being locked by the advanced lock member, the sliding arm slides on the turning arm and tilts together with the platform in the folding direction. By the time the platform is completely folded, the lock member automatically retracts from the locked position to the unlocked position due to its own weight, and the locked state of the sliding arm is changed every time the platform is completely folded. It will be canceled automatically.

[0006]

[Effect of device]

 Since the present invention is configured as described above, the locked state of the sliding arm that is locked while the platform can be folded can be automatically released each time the platform is folded. It is possible to improve the safety of loading work by accurately preventing erroneous operation when the platform is accidentally folded when the load is loaded due to forgetting the operation. Further, it is possible to increase the time during which the lock member contacts the turning guide to decrease the folding speed of the platform.

[0007]

【Example】

 Next, one embodiment of the present invention will be described with reference to the drawings. In a lifter 1 attached to the rear end of a cargo carrier A, a pair of vertically standing columns 2 are fixed to the rear end of the carrier A. Elevating posts 3 that are erected in parallel and driven synchronously by a hydraulic cylinder (not shown) are coupled so as to be movable up and down. A suitable number of pairs of guide rollers 4 are attached to both columns 2 to rotate the elevating posts 3 to guide the elevating posts 3.

A bracket 8 connected to the above hydraulic cylinder via a chain (not shown) is attached to the inner surface near the lower end of the lifting post 3 on one side (the right side facing the front in this example). At the upper end of 8, a turning guide 9 which is projected inward and moves up and down together with the elevating post 3 is integrally attached in a forward descending posture. On the lower surface of the turning guide 9, there is formed a guide surface 9a which is curved in a substantially arcuate shape.

Each of the posts 3 has a base portion 5a having a T-shaped cross section, and a pair of left and right hinge portions 5b fixed to the outer surface of the base portion 5a. A pair of left and right lifting runners 5 that move up and down in conjunction with the lifting operation of the post 3 are slidably coupled through guide rollers 5c, and a platform 6 on which a load is loaded is mounted on the lower ends of the lifting runners 5. The platform 6 is unfolded during horizontal loading and vertically foldable via a pair of left and right support shafts 7 horizontally mounted on the hinge portion 5b. It moves up and down to the position aligned with the surface and the grounding position, and is folded at the rising end when stored.

When both the elevating posts 3 move up and down, the elevating runners 5 elevate in conjunction with the elevating posts 3 with a stroke longer than the elevating stroke of the elevating posts 3 and at a speed faster than the elevating speed of the elevating posts 3. Further, after the both elevating posts 3 rise to the ascending end and stop, the both elevating runners 5 further ascend to the ascending end.

The base 20 attached to the right end in the figure near the base end of the platform 6 has a shaft 11 extending along the width direction of the platform 6, and the base 11 is orthogonal to the shaft 11. It has an arm portion 12 connected in a circular shape and a follower roller 13 rotatably supported at the tip of this arm portion 12, and can be switched between a standing posture and a sideways posture when the platform 6 is deployed. A sliding arm 10 is installed.

A lock hole 11 a is formed at the outer end of the shaft portion 11 of the sliding arm 10 so as to be turned sideways when the sliding arm 10 is laid down, and the shaft portion 11 is slidable. A spring 14 is externally fitted to urge the arm 10 in a direction in which the sliding arm 10 stands up by a return elastic force. The inner end of the spring 14 is fixed to the platform 6 and the inner end of the shaft portion 11 is locked by the bearing 15 inserted therethrough, and the outer end of the spring 14 is locked near the center of the shaft portion 11. ing.

A stopper 12a is provided near the central portion of the arm portion 12 of the sliding arm 10 to contact the contact surface 20a formed on the base 206 when the sliding arm 10 is laid down and to define the tilted end of the arm portion. It is laid out sideways.

The follower roller 13 of the sliding arm 10 is a follower roller 13 when the sliding arm 10 is laid down in a state where the platform 6 is deployed and both the ascending / descending posts 3 and the both ascending / descending runners 5 descend to the descending ends. Moves directly below the turning guide 9 and the sliding arm 10 comes into contact with the turning guide 9 during the ascending stroke of the platform 6, and when the sliding arm 10 is raised, the follower roller 13 causes the turning guide 9 to move. The sliding arm 10 is arranged so as to be retracted from directly below to the rear of the turning guide 9, and the sliding arm 10 cannot contact the turning guide 9 and can contact the turning guide 9. Be changed to a different attitude.

When both the lifting posts 3 and the lifting runners 5 are lifted from the lowering end in a state where the platform is deployed, both the lifting posts 3 slide in the middle of the lifting stroke of the both lifting runners 5 before being lifted to the rising end. The follower roller 13 of the arm 10 comes into contact with the ascending turning guide 9 and rolls along the guide surface 9a, and the sliding arm 10 gradually folds in the folding direction together with the platform 6 around the axis 7a of the support shaft 7. When the two elevating posts 3 ascend to the ascending end and then the ascending and descending runners 5 ascend to the ascending end, the sliding arm 10 stands upright and the platform 6 is folded upright.

Inside the case-shaped guide member 17 attached to the base 20 so as to face the vicinity of the outer end of the shaft portion 11 of the sliding arm 10, the sliding arm 10 can be abutted against the turning guide 9. A lock member 18 that moves forward by a manual operation to a lock position that locks in a tilted posture and retracts to the lock release position that releases this locked state by its own weight and locks and releases the sliding arm 10 and the shaft portion 11. It is inserted so that it can slide in the orthogonal direction.

The lock member 18 is converted into a horizontal position and an upright position together with the platform 6 as the platform 6 is unfolded and folded, and when the lock member 18 that has advanced in the horizontal position stands upright, the lock member 18 retracts by its own weight. Fall to the edge.

A pin-shaped locking portion 18 a that is inserted into the lock hole 11 a of the shaft portion 11 so as to be removable so as to prevent the rotation of the shaft portion 11 is formed at the tip end portion of the lock member 18. A disc-shaped knob 18b with a shaft is formed on the upper plate of the guide member 17 at the base end portion thereof so as to project through a through hole 17a formed in a long hole shape along the forward / backward movement direction of the lock member 18. Has been done.

When the platform 6 is unfolded, the sliding arm 10 in the standing posture is pushed down by hand to change it to the sideways posture, and then the knob 18b of the lock member 18 is pushed by hand to move the lock member 18 to the lock position. When the sliding arm 10 is advanced, the locking portion 18a of the lock member 10 projects into the lock hole 11a of the shaft portion 11 to lock the sliding arm 10 in a sideways posture. When the platform 6 rises and tilts together with the sliding arm 10 and stands up until the lock member 18 is in a posture close to the upright posture, the lock member 18 is lowered by its own weight to the unlocked position and the locking portion 18a is released. The sliding arm 10 is released from the inside of the lock hole 11a, the locked state of the sliding arm 10 is released, and the sliding arm 10 is returned and tilted by the elastic force of the spring 14 to be changed to the standing posture.

When the platform 6 is folded, the locking member 18 is locked from its locked position by its own weight before the platform 6 is stored before the locking member 18 tilts about the support shaft 7 as a fulcrum and is changed to the upright posture. The sliding arm 10 is automatically retracted to the release position, and the locked state of the sliding arm 10 is automatically released by the time the folding of the platform 6 is completed.

When the platform 6 in the folded state is deployed, the sliding arm 10 released from the locked state is automatically changed to the standing posture.

Next, the operation and effect of the embodiment having the above-mentioned configuration will be described. In this example, the platform 6 connected to the pair of vertically movable runners 5 that can be vertically moved is tiltable and horizontally expandable and vertically foldable. It is possible to switch between a posture in which it can be contacted with the turning guide 9 installed near the hoistway of the lifting runner 5 that is fixed to the lifting post 3 and a position in which it cannot contact, and can contact the turning guide 9. In the posture, the sliding arm 10 which slides on the turning guide 9 which is rising during the ascending stroke of the platform 6 and tilts in the folding direction together with the platform 6, and the sliding arm 10 can be brought into contact with the turning guide 9. The sliding arm 11 to the unlocked position where the sliding arm 11 is unlocked before the placket form 6 is completely folded. It is mounted a locking member 18 that.

Therefore, the locked state of the sliding arm 10 that is locked in a state where the platform 6 can be folded can be automatically released each time the platform 6 is folded. It is possible to accurately prevent an erroneous operation in which the platform 6 is accidentally folded in a state where the cargo is loaded and to enhance the safety of the loading work.

Further, when the platform 6 tilts to the retracted position, the lock member 18 ascends together with the ascending / descending post 3 to the ascending turning guide 9 while tilting, so that the locking member 18 moves to the turning guide 9. The contact time can be lengthened to increase the folding time of the platform 6, and the platform 6 can be folded into the storage position at a slow speed to improve the safety when the platform 6 is stored.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part of an embodiment of the present invention.

FIG. 2 is a view taken along line XX of FIG.

FIG. 3 is a perspective view of a lifter.

FIG. 4 is a perspective view of a lock mechanism.

FIG. 5 is a side view of the main part for explaining the unlocking operation of the lock mechanism.

FIG. 6 is a side view of a main part of a conventional lifter.

[Explanation of symbols]

 5 Lifting runner 6 Platform 9 Turning guide 10 Sliding arm 18 Lock member

Claims (1)

[Scope of utility model registration request] 1. A platform which is connected to a pair of vertically movable runners which are vertically movable so as to be tiltable, horizontally expandable, and vertically foldable, and vertically movable near the vertically movable hoistway of the vertically movable runners. It is possible to switch between a posture capable of abutting the turning guide installed so that it can abut against the turning guide, and in a posture capable of abutting the turning guide, it slides on the turning guide during the ascending stroke of the platform. And a sliding arm that tilts in the folding direction together with the platform, and can move to a lock position that locks the sliding arm in a posture in which it can contact the turning guide, and unlocks the sliding arm from the locked state. A safety device for a lifter of a freight vehicle, comprising a lock member that can be retracted by its own weight to an unlocked position.