Pneumatic spring device

Details Pneumatic spring device Pneumatic spring device

1978-08-31

1979-09-04

Reger, Duane A.

Brakes

Internal-resistance motion retarder

Position of thrust member relative to chamber

188317, F16F 948

Patent

active

041665228

ABSTRACT:
A gas-operated absorber includes a piston and cylinder unit wherein axially extending grooves of a predetermined length are provided on the inner surface of the cylinder to vary the dampening effect during the expansion stroke of the piston. The piston expansion movement is braked as the piston moves away from the grooves during its expansion stroke, and through holes in the piston head permit passage of gas therethrough during the expansion stroke although, when the piston moves away from the grooves, a flexible lip on the piston completely closes the holes to effect further braking. Additional holes are also provided in the piston head through which the gas may pass throughout the expansion stroke.

REFERENCES:
patent: 1164371 (1930-01-01), Lovejoy
patent: 1744514 (1931-12-01), Thompson
patent: 2346275 (1944-04-01), Read et al.
patent: 2379750 (1945-07-01), Rossman

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