JPS5935819B2 - Elevator emergency stop device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a brake shoe for an emergency stop device particularly suitable for use in high-speed elevators.

The shoe material of the emergency stop device for high-speed elevators is made of a material that has a stable coefficient of friction from high to low speeds to soften the shock of stopping, and has a high stopping energy.

Because of the high energy consumption, heat-resistant and wear-resistant materials are required.

However, due to material characteristics, materials with stable coefficients of friction have poor heat resistance and wear resistance, and conversely, materials with excellent heat resistance and wear resistance have unstable coefficients of friction.

For this reason, it has been difficult to obtain a material with a good coefficient of friction, heat resistance, and wear resistance using a single material.

The present invention aims to improve the above-mentioned drawbacks, and provides a brake shoe for an emergency stop device for a high-speed elevator that has a stable coefficient of friction from high to low speeds, and has heat resistance and wear resistance.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a schematic structure of an elevator corner, in which 1 is a car, 2 is a guide rail, 3 is a hoisting rope, 4 is an emergency stop device, and 5 is a brake.

The structure of the emergency stop device 4 is the same as the well-known one, and when the elevator overspeeds in the downward direction due to a malfunction or breakage of the hoisting rope 3, the brake 5 is pressed against the guide rail 2 by the force of the spring 6. The elevator decelerates and stops due to the frictional force generated on the sliding surface.

Figure 2 is a detailed diagram of the brake element 5, which is made of iron-based friction material 5 which has excellent heat resistance and wear resistance, but whose friction coefficient is somewhat unstable.
A and a copper-based friction material 5B, which has slightly inferior heat resistance and wear resistance but have a stable friction coefficient from high to low speeds, are placed on the surface of the brake 5 facing the guide rail 2, and an iron-based friction material 5A is placed on the top. A copper-based friction material 5B is attached to the lower part.

This is because the lower part of the brake element 5 slides on new guide rails 2 one after another, so the temperature of the sliding surface does not rise much.
Since the upper part slides on the guide rail 2, which is heated to a high temperature by sliding with the lower part, the sliding surface becomes hot and wear is severe due to the influence of heat. The friction material 5A is placed at the top, and the copper-based friction material 5B, which has a stable friction coefficient although it has slightly inferior heat resistance and wear resistance, is placed at the bottom. This allows the characteristics of each friction material to be utilized. Thus, it is possible to obtain a brake element 5 with stable wear resistance and friction coefficient.

The above-mentioned iron-based friction material 5A is preferably a friction material containing at least 70 parts of iron, and the copper-based vibration material 5B is preferably a friction material containing at least 70 parts of copper.

FIG. 3 shows another embodiment of the present invention, and is a diagram corresponding to FIG. 2.

5A, 5B are integrally molded from sintered alloy, with the upper part mainly containing iron-based component 5A with excellent heat resistance and wear resistance, and the lower part mainly containing copper-based component 5B with a stable coefficient of friction. It is clear that the same friction characteristics as the brake element 5 shown in FIG. 2 can be obtained.

Further, in the above embodiment, two types of friction materials are used in combination, but even better friction characteristics can be obtained by combining two or more types of materials.

As explained above, this invention uses a material mainly composed of iron, which has good heat resistance and wear resistance, on the same sliding surface of the brake at the upper part, and a material whose heat resistance and wear resistance are slightly inferior to the lower part. By arranging and configuring the material mainly composed of copper, which has a stable coefficient of friction, the coefficient of friction is stabilized from high to low speeds, reducing stopping shock, and improving wear resistance. It is possible to prevent the rail holding force from decreasing due to brake wear and improve braking performance.

[Brief explanation of drawings]

FIG. 1 is a side view showing a schematic structure of an elevator emergency stop device according to the invention, FIG. 2 is an enlarged view of a brake, and FIG. 3 is a view corresponding to FIG. 2 showing another embodiment of the invention. 1...basket, 2 guide rail, 3...
・Hoisting rope, 4...Emergency stop device, 5...
...Brake, 5A...Iron-based friction material, 5B.
...Copper-based friction material. In addition, the same parts or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. In a device that stops the elevating object by pressing and sliding the sliding surface of a brake that is attached to an elevating object guided by a guide rail on the guide rail, the brake is attached to the same surface as the sliding surface of the elevating object. An elevator emergency stop device characterized in that the upper part is made of a material mainly composed of iron, which has good wear resistance, and the lower part is made of a material mainly composed of copper, which has a stable coefficient of friction.