Extension sleeve type elevator and automobile maintenance elevator

Abstract

The present invention provides an extension sleeve type elevator and an automobile maintenance elevator, capable of saving an additional space for a falling-prevention device, and preventing a bearing station from rotating by the falling-prevention device. An lower layer piston is arranged in an external cylinder in a mode of freely sliding, an upper layer piston is arranged in the lower layer piston in a mode of freely sliding, a juxtaposition hydraulic cylinder is arranged in the lower layer piston and includes a downward hydraulic cylinder with a downward cylinder rod and an upward hydraulic cylinder with an upward cylinder rod side by side, the falling-prevention device of the upper layer piston is arranged inside the upper layer piston, and the falling-prevention device of the lower layer piston is arranged on the side faces of the lower layer piston and the side faces of the external cylinder. The lower layer piston slides upwards in the external cylinder by means of the extension of the downward cylinder rod, and the upper layer piston slides upwards in the lower layer piston by means of the extension of the upward cylinder rod.

Description

technical field [0001] The present invention relates to a telescopic telescopic elevator and an automobile maintenance elevator using the telescopic telescopic elevator. Background technique [0002] A vehicle maintenance elevator using a telescoping telescopic elevator equipped with a multi-stage piston (ram) is popular because it can make a shallow pit. On the other hand, a safety device is provided in such an elevator that moves up and down by telescopic motion so that it will not fall naturally due to failure or the like. [0003] For example, the car maintenance elevator described in Patent Document 1 (Japanese Patent No. 2719500 ) is to place the elevator equipped with a hydraulic cylinder and a multistage plunger (plunger) in the pit, and it has a safety device, that is, The lifter is equipped with a locking rod that can move synchronously with the plunger. The length of the locking rod is made to be the same as the maximum lift of the plunger, and the locking claws ...

AI Technical Summary

Problems solved by technology

[0005] However, in the structure of the above-mentioned patent document 1, since the engaging rod for preventing the descent is installed on the outside of the multi-stage plunger, especially the structure in which the lifter moves in the pit, the width of the pit must be increased. Increased construction costs

In addition, the pit cover used to cover the pit had to be enlarged

In addition, when the elevator is naturally descending to prevent the action of the descending device, since the load is supported by the engaging rod that is eccentric with respect to the center of the elevator, it is easy to damage the stability of the elevator, so a pair of left and right engaging rods are required. In the joint part, it is easy to bend due to the shaking of the engaging part, so the instability may be more obvious.

[0006] In addition, for the sake of safety, it is hoped that the bearing platform arranged on the upper part of the piston will not rotate, but there is no structure to prevent rotation

[0007] On the other hand, in the structure of the above-mentioned patent document 2, although a double claw portion and a rack (rack) are provided as a descending preventing device, the descending can be prevented relatively stably, but the use of a release confirmation sensor and the like is more complicated and has a high reliability. There is a problem

In addition, in the event of a rotational force acting on the carrying platform, there is a possibility of damaging the descending prevention device as a safety device

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