Damper equipped with relative displacement detecting sensor

Brakes – Internal-resistance motion retarder – Motion damped from condition detected outside of retarder

Reexamination Certificate

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Details

Other Related Categories

C188S267000

Type

Reexamination Certificate

Status

active

Patent number

07992692

Description

ABSTRACT:
The present invention relates to a cylinder which has hollow portion therein; a piston rod which is inserted through an upper side of the cylinder and has a groove pattern having plurality of convex portions and concave portions which are alternately formed; a piston valve which is connected with a lower end of the piston rod so as to be reciprocated in the cylinder and has a fluid passing hole which is formed in an up and down direction; a rod guide which closes up an upper end of the cylinder tightly and guides an up-down movement of the piston rod and which has a through-hole at a side portion thereof; and a sensor module which is installed to the rod guide so as to detect a movement of the piston rod by using a variation in magnetic field generated when the piston rod is moved.

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patent: 2006/0011426 (2006-01-01), Sas et al.
patent: 2008/0110710 (2008-05-01), Berberich
patent: 296808 (1988-12-01), None
patent: 59-110708 (1984-07-01), None
patent: 04-071114 (1992-06-01), None
patent: H04-78505 (1992-07-01), None
patent: 09-329462 (1997-12-01), None
patent: 2006-273222 (2006-10-01), None

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