Brakes – Internal-resistance motion retarder – Position of thrust member relative to chamber
Reexamination Certificate
2007-11-27
2007-11-27
Burch, Melody M. (Department: 3683)
Brakes
Internal-resistance motion retarder
Position of thrust member relative to chamber
C188S284000, C188S322190
Reexamination Certificate
active
11041761
ABSTRACT:
A hydraulic shock absorber has an outer body with a central bore. A first piston is telescopingly received in the central bore adjacent a closed end thereof, and has a generally annular shape with an inner surface defining a central piston bore, and an outer surface disposed adjacent the sidewall of the central body bore to define a first annularly-shaped metering aperture. A second piston is telescopingly received in the central bore of the first piston, and has an outer surface disposed adjacent to the inner surface of the first piston to define a second annularly-shaped metering aperture therebetween. Hydraulic fluid is disposed in the central body bore between the closed end thereof and the pistons, such that inwardly directed impact forces on the pistons displace the hydraulic fluid through the metering apertures to progressively dampen the impact forces.
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Ace Controls, Inc.
Burch Melody M.
Price Heneveld Cooper DeWitt & Litton LLP
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