Two stage damping shock absorber

Details Two stage damping shock absorber Two stage damping shock absorber

1992-06-19

1993-10-05

Le, Mark T.

Brakes

Internal-resistance motion retarder

Resistance alters relative to direction of thrust member

188317, 18832215, F16F 934

Patent

active

052496520

ABSTRACT:
A two-stage shock absorber comprises a casing having a low level damping piston rod therein an end portion of which has two spaced apart flanges thereon with a low resistance fluid path formed therebetween. A floating ring piston is slidingly seated about the piston rod between the flanges and has high resistance throughbores therein. When vibrational forces become excessive to a point where one or the other of the flanges engages against the floating ring piston, the low resistance fluid path is closed off by the floating piston and the high resistance throughbores engage within the fluid flow system to cause a shift from primary low level damping to a high level damping. Once pressure within the system equalizes and the ring piston is no longer in contact with either of the flanges, low level damping resumes.

REFERENCES:
patent: 2252772 (1941-08-01), Katcher
patent: 4503951 (1985-03-01), Imaizumi
patent: 4558767 (1985-12-01), Taylor
patent: 4588053 (1986-05-01), Foster
patent: 4735402 (1988-04-01), Davis
patent: 4817766 (1989-04-01), Nilsson
patent: 4998592 (1991-03-01), Londt et al.
"Gabriel Shock Absorber Design Manual", Gabriel of Canada, Ltd., pp. 5-13.

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