Hydraulic ram safety device with circular brake

Details Hydraulic ram safety device with circular brake Hydraulic ram safety device with circular brake

1981-08-04

1984-05-22

Butler, Douglas C.

Brakes

Rod

188170, 187 849, 92 24, 92 27, B60S 1300, F15B 1526

Patent

active

044496150

ABSTRACT:
A safety brake for hydraulic rams, particularly for hydraulic elevators, includes a plurality of braking members disposed around the piston in a circular array. The outer surfaces of the spaced apart braking members together form the shape of a truncated cone, and the inner surface of a stationary housing surrounding the brake members is complementarily shaped. The angle of inclination of the two conical surfaces is small, and the braking members move downwardly and inwardly only a short distance to engage the piston, so that the conical geometry of the brakes and housing surfaces does not produce significantly mismatched sliding surfaces as the brake members move downwardly.

REFERENCES:
patent: 1379165 (1921-05-01), Burns et al.
patent: 1405223 (1922-01-01), Kelley
patent: 3215231 (1965-11-01), Lodige
patent: 3597016 (1971-08-01), Gachot et al.
patent: 3635315 (1972-01-01), Shalders
patent: 3706361 (1972-12-01), Paulssen et al.
patent: 3783976 (1974-01-01), Kerr
patent: 3783983 (1974-01-01), McNally et al.
patent: 3995534 (1976-12-01), Rastetter
patent: 4213244 (1980-07-01), Bell et al.

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