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Shock absorber for elevator

A technology of buffers and elevators, applied in the direction of shock absorbers, shock absorbers, springs/shock absorbers, etc., can solve the problems of increasing the height and size of hydraulic shock absorbers

Inactive Publication Date: 2010-12-29
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the lower the coil spring is, the greater the thickness and number of turns of the coil spring will be, and the overall height of the shock absorber will be further increased.

Method used

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  • Shock absorber for elevator
  • Shock absorber for elevator
  • Shock absorber for elevator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0016] figure 1 It is a sectional view showing the elevator buffer according to Embodiment 1 of the present invention. also, figure 2 is showing figure 1 A cross-sectional view of the retracted state of the elevator buffer in . In the figure, the buffer 1 is installed in the pit of the hoistway. Therefore, when an elevating body (for example, a car, a counterweight, etc.) ascending and descending in the hoistway passes the lowermost floor for some reason and further descends, the elevating body collides with the buffer 1 . The shock absorber 1 absorbs the impact from the elevating body when being collided by the elevating body, and alleviates the impact on the elevating body.

[0017] The buffer 1 has: a base cylinder 2 fixed to the bottom pit of the hoistway; a plurality of (two in this example) plungers 3, 4 sequentially connected from the base cylinder 2; 4 a plurality of (in this example, two) return springs (a plurality of force urging bodies) 5, 6 for urging upward...

Embodiment approach 2

[0035] image 3 It is a cross-sectional view showing an elevator buffer according to Embodiment 2 of the present invention. also, Figure 4 is showing image 3 A cross-sectional view of the retracted state of the elevator buffer in . In the drawing, a stopper 21 is provided on the upper end of the plunger 3 at the lowest stage. The stopper 21 is a stepped portion provided on the outer peripheral portion of the lowermost plunger 3 . Due to the engagement of the stopper 21 with the contact member 10 , the displacement of the lowermost plunger 3 relative to the cylinder portion 8 downward (in the direction toward the bottom) is restricted.

[0036]A stopper 22 is provided at the upper end of the uppermost plunger 4 . The stopper 22 is a stepped portion provided on the outer peripheral portion of the uppermost plunger 4 . The downward displacement of the uppermost plunger 4 relative to the lowermost plunger 3 is restricted by the engagement of the stopper 22 with the contact...

Embodiment approach 3

[0040] Figure 5 It is a cross-sectional view showing an elevator buffer according to Embodiment 3 of the present invention. also, Image 6 is showing Figure 5 A cross-sectional view of the retracted state of the elevator buffer in . In the figure, the bottom plate 7 is provided with a plurality of (two in this example) stoppers 31 , 32 that respectively restrict the displacement of the plungers 3 , 4 toward the bottom plate 7 . The stopper 31 restricts the displacement of the lowest-stage plunger 3 by abutting against the lowest-stage plunger 3 . The stopper 32 restricts the displacement of the uppermost plunger 4 by abutting against the uppermost plunger 4 .

[0041] The respective stoppers 31 and 32 are arranged inside the cylinder unit 8 . In addition, each stopper 31 , 32 is arranged along each return spring 5 , 6 . In this example, the stopper 31 is a cylindrical member along the inner periphery of the return spring 5 , and the stopper 32 is a cylindrical member a...

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Abstract

A shock absorber for an elevator has a base cylinder, plungers, and urging bodies. The base cylinder has a base and a cylinder section provided on the base. Hydraulic oil is contained in the cylinder section. The plungers are sequentially connected to each other so as to be slidable upward from the cylinder section. The plungers can individually vertically move relative to the cylinder section while being subjected to resistance of the hydraulic oil. On the base are arranged the urging bodies individually urging the plungers in the direction in which they are separated upward from the base.

Description

technical field [0001] The invention relates to an elevator buffer used for alleviating the impact on the car and the counterweight. Background technique [0002] Conventionally, in order to achieve a shortened height dimension, there has been proposed a hydraulic shock absorber for an elevator in which a multistage plunger is formed such that its diameter is successively reduced and is configured to be capable of entering into a base cylinder filled with working oil. It expands and contracts in the up and down direction. Coil springs are respectively connected between the plungers of each stage to restore the position of the plungers after the hydraulic buffer is compressed. The positions of the plungers of each stage are restored by displacing the plungers of the upper stage and the lower stage in directions to separate from each other by the urging force of the coil spring (see Patent Document 1). [0003] Patent Document 1: Japanese Unexamined Patent Publication No. 20...

Claims

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Application Information

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IPC IPC(8): B66B5/28F16F9/32
CPCF16F13/007B66B5/282B66B5/0056
Inventor 井村光芳
Owner MITSUBISHI ELECTRIC CORP
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