Shock absorber

Details Shock absorber Shock absorber

1997-07-24

1998-03-24

Young, Lee W.

Brakes

Internal-resistance motion retarder

Motion damped from condition detected outside of retarder

188 62, 1882828, F16F 949

Patent

active

057302600

ABSTRACT:
A shock absorber comprises a cylinder defining a cavity between a pair of end walls. A piston rod extends axially through one of the end walls, and a piston is mounted on the piston rod between the end walls so as to divide the cavity into first and second working chambers containing a damping fluid. A first array of passages extends through the piston and communicates between the first and second chambers, and a sprung valve assembly is provided for obturating the first array of passages in the event of the velocity of the piston rod relative to the cylinder exceeding a predetermined value. A second array of passages communicates between the working chambers and provides a fluid flow path when the first array of passages is blocked by the sprung valve assembly. Restricted exhaust orifices communicate with the second array of passages for limiting the flow of fluid through the second array of passages so as to control the movement of the piston rod. The dimensions of the exhaust orifices are determined in accordance with the desired force-displacement profile of the shock absorber. This shock absorber typically forms part of a rail retarder for controlling the speed of wagons in the marshalling yards and the like.

REFERENCES:
patent: 1401111 (1921-12-01), Sigel
patent: 1471560 (1923-10-01), Langford
patent: 1543098 (1925-06-01), Carter et al.
patent: 1563169 (1925-11-01), Daniel et al.
patent: 2472841 (1949-06-01), Ochs
patent: 4307875 (1981-12-01), Schnitzius et al.
patent: 4474271 (1984-10-01), Molders et al.
patent: 4721189 (1988-01-01), Bick
patent: 5595269 (1997-01-01), Beck

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