Brakes – Internal-resistance motion retarder – Resistance alters relative to direction of thrust member
Reexamination Certificate
2004-10-27
2008-10-07
Williams, Thomas J (Department: 3683)
Brakes
Internal-resistance motion retarder
Resistance alters relative to direction of thrust member
C188S282100, C188S313000, C188S316000
Reexamination Certificate
active
07431135
ABSTRACT:
A two-stage shock absorber has a pressure tube within which a piston assembly is slidably disposed. A piston rod is attached to the piston assembly and extends out of the pressure tube. A sleeve is slidably disposed within the pressure tube and engages the piston rod. After a specified amount of movement of the piston assembly with respect to the pressure tube in an extension movement of the shock absorber, the sleeve engages a plurality of spirally positioned bores on the piston rod and reduces the fluid flow through the valve assembly to progressively switch the shock absorber from soft damping to firm damping. In another embodiment the sleeve engages a spiral groove of variable depth on the piston rod to reduce the fluid flow through the valve assembly to progressively switch the shock absorber from soft damping to firm damping. In yet another embodiment of the present invention, the sleeve engages a tapered slot of variable cross-section to reduce the fluid flow through the valve assembly to progressively switch the shock absorber from soft damping to firm damping.
REFERENCES:
patent: 2826960 (1958-04-01), Lucien et al.
patent: 3063518 (1962-11-01), Stark
patent: 3256960 (1966-06-01), Casimir
patent: 6264015 (2001-07-01), De Kock
patent: 6352145 (2002-03-01), DeMolina et al.
patent: 2005/0056501 (2005-03-01), de Molina
patent: 04171329 (1992-06-01), None
Harness Dickey & Pierce PLC
Tenneco Automotive Operating Company Inc.
Williams Thomas J
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