JPS6229547Y2 - - Google Patents

Description

[Detailed description of the invention] This invention engages pallets used in multi-story parking lots, multi-storey warehouses, etc. when the pallets rise and reach a predetermined position to hold and support the pallets at that position. Regarding safety equipment.

Multi-story parking lots and multi-story warehouses are widely used mainly in urban areas because they allow effective use of land, and one of them is a type in which pallets on which vehicles and cargo are placed can be raised and lowered. In such types, the pallets are usually lifted by steel cables or chains connected to their four corners, and there is no risk of the hoisted pallets tipping or falling due to the steel cables or chains being cut. For safety purposes, a safety device is provided to support the pallet in the lifted position. In most cases, this safety device consists of a pin or hook that removably engages with the pallet, and an actuator that operates the pin or hook to move the pin or hook into and out of the pallet engagement position. The actuating device generally consisted of an air cylinder, hydraulic cylinder, solenoid, etc.

This idea uses an extremely simple link mechanism that operates as the pallet goes up and down to engage and disconnect the hook from the pallet, and is extremely simple in structure compared to the conventional safety devices mentioned above. be.

Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. The one shown in the drawing uses a chain with small strain that causes almost no difference in the amount of elongation due to the difference in length to lift the pallet 1. This shows an example in which a hydraulic cylinder is used as a chain feeding mechanism.Of the pillars 2 erected at each of the four corners of the pallet 1, a sprocket 3 is placed on each pillar on the right side of the figure, and a sprocket 3 is placed on each pillar on the left side in the figure. A drive shaft 4 is supported on the upper part in a horizontally suspended state on the pillar, and a pair of sprockets 5 are attached to each of the front and rear ends of the drive shaft. A hydraulic cylinder 7 is installed upright on a mounting plate 6 that projects sideways from the left rear strut, and a pair of sprockets 10 are supported on a bracket 9 provided at the lower end of the piston rod that projects downward through the mounting plate 6. has been done. Chains 11A and 11B with one end attached to the mounting plate 6 are hooked onto each of these sprockets 10, and after passing through the sprocket 5 on the support column, one chain 11A is further hooked on the sprocket 3 on the right column. The other chain 11B is connected to the right end of the rear cross member 12A constituting the pallet 1, and the other chain 11B descends as it is and is connected to the left end of the rear cross member.

Each sprocket 5 at the front end of the drive shaft 4 which is rotatably driven by each of the chains 11A and 11B is also provided with a chain 11 whose one end is connected to a weight 14.
C and 11D are hung respectively, one chain 11C is connected to the right end of the front cross member 12B that constitutes the pallet through the sprocket 3, and the other chain 11D is lowered as it is and connected to the left end of the front cross member. has been done.

When the sprocket 10 descends due to the hydraulic pressure lowering the piston rod, the chains 11A, 11
B is pulled downward, and a chain corresponding to twice the length of the drop of the sprocket is retracted.
At the same time, the chains 11C and 11D are also fed in by the same amount while lowering the weights 14 via the drive shafts 4 which are rotationally driven by these chains. Thus, the pallet 1 moves up and down while aligning each end of the cross members 12A and 12B along the support columns 2. When the pallet 1 reaches a certain height, a limit switch 16 is installed on any column 2 so that the pallet 1 stops rising and is supported at a predetermined height.
A safety device 17, which releasably engages the 2B end, is preferably provided on each post.

As shown in FIGS. 2A to 2D, the safety device 17 has its upper portion rotatably pivoted to the support column 2, and is normally attached to the stopper pin 18 by the action of gravity or by a spring.
A projecting piece 19 consisting of a horizontal part 19A and a downwardly inclined or curved cam part 19B is connected to the cross member 1.
2A, 12B ends projecting on the ascending path, and the hook 20 is pivotably attached to the hook, and is always moved by its own weight or by the action of a spring.
A cam portion 23A is provided on one side to engage with a pin 21 protruding from the protruding piece 19, and is inclined or curved upward, the tip of which protrudes further than the protruding piece 19. It is connected to the hook piece 23. In the safety device configured as described above, the pallet 1 rises and its horizontal members 12A, 12
When the end of B engages with the cam portion 19B of the protruding piece 19 and further rises (see FIG. 2A), the cam portion 19
While sliding B onto the end of the crosspiece, the protrusion 19 escapes from the upward path of the end of the crosspiece, and the hook 20 is rotated counterclockwise in the figure. When the end of the cross member continues to rise and hits the hook piece 23 at the tip of the protrusion, the hook piece begins to rotate clockwise. While the end of the crosspiece is rising, the hook, which rotates counterclockwise, stops rotating when the tip of the protrusion engages the side surface of the crosspiece. This continues while one tip remains engaged. After the cross member rises further and the tip of the protrusion reaches the lower end of the side surface of the cross member, it enters under the cross member and returns the hook. The return of the hook is continued until it engages with the stopper pin 18. During this period, the cross member, which continues to rise, stops moving when the cross member engages with the limit switch 16, and thereafter the end portion of the cross member is supported on the horizontal portion 19A of the protrusion 19. In this state, the hook piece 23 is engaged with the side surface of the cross member and is prevented from returning (FIG. 2B).

As described above, the safety device 17 automatically engages and supports the pallet 1 as the pallet 1 rises.

When lowering the pallet 1, the pallet is once raised by an appropriate amount, and then the hook 23 is moved back until it engages with the pin 21 (FIG. 2C). When the pallet is then lowered, the ends of the crosspieces engage with the cam portions 23A of the hooks 23, and while rotating the hook 20 counterclockwise, the hooks 23 are retreated from the descending path of the ends of the crosspieces (the first 2D diagram). When the tip of the hook comes off the upper end of the side of the cross member, the hook returns to its original state in the same manner as described above. The lowering of the pallet supported by the safety device also takes place automatically.

As described above, the safety device of the present invention consists of a hook and a hook, so the structure is extremely simple compared to the conventional safety device equipped with a hook operating device. The hook is automatically engaged and disengaged from the pallet, and no operation is required to engage and disengage the hook from the pallet.

[Brief explanation of drawings]

FIG. 1 is a perspective view, and FIGS. 2A to 2D are diagrams showing the order of operation of the safety device. 1... Pallet, 2... Support, 7... Hydraulic cylinder, 11A, 11B, 11C, 11D... Chain, 12... Cross member, 16... Limit switch, 17... Safety device, 18... Stopper pin, 19 ... protrusion, 20 ... hook, 21 ... pin, 23 ... hook.

Claims (1)

[Scope of utility model registration request] A pallet safety device that is rotatably supported by a support and that is capable of removably engaging a liftable pallet on which a vehicle, cargo, etc. is placed and supporting the pallet at a predetermined height. A projecting piece consisting of a horizontal part for supporting the pallet and a cam part that is inclined or curved downward and engages with the rising pallet is formed protrudingly, and is always engaged with a fixed stopper pin by its own weight or by the action of a spring. a hook for projecting the protruding piece into the lifting path of the pallet;
It is rotatably attached to the hook, and is always engaged by its own weight or by the action of a spring with a pin protruding from the hook, so that its tip protrudes beyond the tip of the protrusion, In addition, a cam portion is formed that is inclined or curved upward from the tip, and the cam portion has a hook portion that engages the pallet descending. Safety device for pallets that move back by action.