Piston for a piston-cylinder unit

Details Piston for a piston-cylinder unit Piston for a piston-cylinder unit

2011-01-18

2011-01-18

Lazo, Thomas E (Department: 3745)

Expansible chamber devices

Piston

With fluid passage in piston face

C188S322150

Reexamination Certificate

active

07870818

ABSTRACT:
A piston-cylinder assembly includes a working cylinder, and a one-piece stamped and formed piston body which is attached to a piston rod, the piston body being axially movable in the cylinder and dividing the cylinder into two working spaces. The piston body has at least one first opening provided with a first valve for passing fluid when the piston moves in a pull direction, and at least one second opening provided with a second valve for passing fluid when the piston moves in a push direction. A circumferential surface of the piston body is formed with a shallow groove which holds a seal between the circumferential surface and the working cylinder.

REFERENCES:
patent: 2953223 (1960-09-01), Dillenburger et al.
patent: 3093891 (1963-06-01), Karlgaard
patent: 4635909 (1987-01-01), Gold
patent: 6817454 (2004-11-01), Nezu et al.
patent: 6886670 (2005-05-01), Holiviers et al.
patent: 6968930 (2005-11-01), Shibao
patent: 7011193 (2006-03-01), Lemmens et al.
patent: 1 968 391 (1967-09-01), None

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