Elevator safety brake having a plasma sprayed friction coating

Details Elevator safety brake having a plasma sprayed friction coating Elevator safety brake having a plasma sprayed friction coating

1997-11-06

1999-10-12

Oberleitner, Robert J.

Brakes

Elements

Shoes

F16D 6900

Patent

active

059643226

ABSTRACT:
An elevator safety brake for stopping an elevator car is provided with a brake shoe having a fused sprayed friction coating for contacting an elevator guide rail surface to provide a stopping force. In a preferred embodiment, the coating is obtained by plasma spraying an admixture of 85 weight percent nickel-chromium alloy particles and 15 weight percent tungsten carbide particles on a substrate. The plasma sprayed admixture is fused. The fused sprayed friction surface of the brake exhibits a consistent high friction and low wear suitably accommodating high speed, high load elevators installed in very tall buildings.

REFERENCES:
patent: 3539192 (1970-11-01), Prasse
patent: 3655425 (1972-04-01), Longo et al.
patent: 3897582 (1975-07-01), Olcott
patent: 4146654 (1979-03-01), Guyonnet
patent: 4351885 (1982-09-01), Depoisier et al.
patent: 4833040 (1989-05-01), Fishman et al.
patent: 5503257 (1996-04-01), Sugita et al.

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