Brakes – Internal-resistance motion retarder – Resistance alters relative to direction of thrust member
Reexamination Certificate
2000-10-24
2001-11-13
Schwartz, Christopher P. (Department: 3613)
Brakes
Internal-resistance motion retarder
Resistance alters relative to direction of thrust member
C267S034000, C188S268000
Reexamination Certificate
active
06315093
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a small hydraulic shock absorber to be used for a door of a furniture or the like.
BACKGROUND ART
Generally, a hydraulic shock absorber is composed of a piston which partitions the inside of a cylinder into an extension side oil room and a compression side oil room, an orifice for connecting the extension side oil room and the compression side oil room, a piston rod which extends from the cylinder interlocking with the piston, and an accumulator which allows entrance and exit of a hydraulic operating fluid equivalent to the volume of an entered portion of the piston rod in the cylinder.
SUMMARY OF THE INVENTION
However, conventional hydraulic shock absorbers have complicated inner structure. Thus, the problem is such that miniaturization is difficult and moreover high precision in processing is required and an increase in cost of products involves in order to realize the miniaturization.
An object of the present invention is to provide structure suitable for small hydraulic shock absorbers.
In order to achieve above the object the present invention provides a hydraulic shock absorber comprising: a piston which partitions an inside of a cylinder into an extension side oil room and a compression side oil room; throttling means for connecting the extension side oil room and the compression side oil room; a piston rod which is provided separately from the piston and extends from the cylinder interlocking with the piston; an accumulator which allows entrance and exit of a hydraulic operating fluid equivalent to volume of an entered portion of the piston rod in the cylinder; and a spring which pushes the piston against the piston rod.
The present invention further provides a hydraulic shock absorber comprising: a groove formed at an end surface of the piston with which the piston rod comes into contact, wherein the throttling means are formed at a center section of the piston and open at the groove.
The present invention further provides a hydraulic shock absorber comprising: an annular passage which is formed between an outer circumference of the piston and an inner circumference of the cylinder and connects the extension side oil room and the compression side oil room; and a piston ring which is provided at an outer circumference of the piston and opens and closes the annular passage, wherein the piston ring operates as a compression side check valve which opens for a flow of a hydraulic operating fluid from the extension side oil room to the compression side oil room.
The present invention further provides a hydraulic shock absorber having: the accumulator comprising: an elastic body room in which an elastic body is stored; and a gas chamber which is partitioned by the elastic body, and the gas chamber is connected with the extension side oil room via the elastic body room.
The present invention further provides a hydraulic shock absorber comprising: a bearing member which is provided at the cylinder and supports the piston rod slidably, wherein the elastic body room and the gas chamber are provided between the bearing member and the cylinder, and the elastic body is cylindrical and provided between the bearing member and the cylinder.
The present invention further provides a hydraulic shock absorber comprising: a bush composed of an elastic member installed at a tip of the piston rod which is extending from the cylinder.
The details as well as other features and advantages of the invention are set forth in the remainder of specification and are shown in accompanying drawings.
REFERENCES:
patent: 3919509 (1975-11-01), Schnitzius
patent: 4044865 (1977-08-01), Tournen
patent: 4342447 (1982-08-01), Marx
patent: 4474271 (1984-10-01), Molders et al.
patent: 4632228 (1986-12-01), Oster et al.
patent: 4749071 (1988-06-01), Taylor
patent: 6129343 (2000-10-01), Ecarnot
Miura Toshiya
Miyazawa Tadashi
Kayaba Industry Co. Ltd.
Rabin & Berdo P.C.
Schwartz Christopher P.
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