Attenuation coefficient switching type hydraulic damper

Details Attenuation coefficient switching type hydraulic damper Attenuation coefficient switching type hydraulic damper

2006-12-05

2006-12-05

Kramer, Devon (Department: 3683)

Brakes

Internal-resistance motion retarder

Motion damped from condition detected outside of retarder

C188S312000, C188S313000, C267S064280, C251S250000

Reexamination Certificate

active

07143875

ABSTRACT:
A hydraulic damper used for reducing shaking of a structure, for example in an earthquake. The hydraulic damper has a cylinder, a piston movable in a reciprocating manner within the cylinder, hydraulic chambers at opposite sides of the piston, and a single on-off control valve. There is a passage for connecting both of the hydraulic chambers and is on-off controlled to change a damping coefficient. A damping coefficient switching-type hydraulic damper is provided between a piston rod and the on-off control valve. A first damping coefficient is attained when the on-off control valve is maintained in a closed state for movement of said piston in one direction, and a second damping coefficient is attained when the on-off control valve is opened. A mechanical drive for the control valve may be a straight gear operatively attached to the piston rod of the cylinder, and a crank mechanism that works with the straight gear to on-off control the control valve.

REFERENCES:
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patent: 11-336366 (1999-12-01), None
patent: 11336366 (1999-12-01), None
patent: 2002-054675 (2002-02-01), None

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