Brakes – Internal-resistance motion retarder – Resistance alters relative to direction of thrust member
Patent
1997-03-10
1999-07-27
Oberleitner, Robert J.
Brakes
Internal-resistance motion retarder
Resistance alters relative to direction of thrust member
188280, F16F 950
Patent
active
059274484
ABSTRACT:
A shock absorber capable of exhibiting increased shock absorbing characteristics and constantly ensuring desired characteristics irrespective of applications intended. A cylinder is formed therein with a first hollow section of a large diameter and a second hollow section of a small diameter. A piston includes an end wall and a peripheral wall and is formed into a size sufficient to be moved in the second hollow section. The peripheral wall is formed with a plurality of orifices and the end wall is formed with a piston rod insertion through-hole and at least one viscous fluid passage hole. The piston rod is provided thereon with first and second flanges, which are spaced from each other at an interval larger than a thickness of the end wall of the piston and arranged so as to interpose the end wall therebetween. When the piston is moved in a direction in which shock absorbing characteristics are exhibited, the first flange closes the passage hole of the end wall, to thereby cause transfer of viscous fluid to be carried out via only the orifices. The passage hole is open during return movement of the piston, so that a large amount of viscous fluid may be transferred.
REFERENCES:
patent: 4588054 (1986-05-01), LeBaron
patent: 4874066 (1989-10-01), Siberstein
patent: 5219414 (1993-06-01), Yamaoka
patent: 5249652 (1993-10-01), Leitzman et al.
patent: 5495923 (1996-03-01), Bruski et al.
Fuji Seiki Kabushiki Kaisha
Oberleitner Robert J.
Salavera Melanie
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