Brakes – Internal-resistance motion retarder – Resistance alters relative to direction of thrust member
Reexamination Certificate
2008-01-29
2008-01-29
Kramer, Devon (Department: 3683)
Brakes
Internal-resistance motion retarder
Resistance alters relative to direction of thrust member
C188S282600, C188S313000, C188S317000, C188S322150
Reexamination Certificate
active
07322449
ABSTRACT:
A piston connected to a piston rod is fitted into a cylinder in which a hydraulic fluid is sealably contained. A flow of the hydraulic fluid is generated in an extension-side fluid passage and a compression-side fluid passage according to a sliding motion of the piston, and this flow of the hydraulic fluid is controlled by a main disk valve, to thereby generate a damping force. A valve-opening pressure of the main disk valve is controlled by an internal pressure of a back-pressure chamber generated due to a difference in flow path area between a back-pressure chamber inlet fluid passage and a downstream-side orifice. During a reverse stroke, a check valve is opened, to thereby introduce a pressure in a downstream-side cylinder chamber into the back-pressure chamber, so that the main disk valve can be maintained in a closed position and a stable damping force can be generated.
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patent: 2004-257507 (2004-09-01), None
Hitachi , Ltd.
Kramer Devon
Wenderoth , Lind & Ponack, L.L.P.
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