Piston assembly

Details Piston assembly Piston assembly

1996-04-09

1998-08-18

Nguyen, Hoag

Expansible chamber devices

Piston

Side wall portion includes peripheral axially extending...

92245, 92181P, 92249, 29888047, 29888049, F16J 900

Patent

active

057945179

ABSTRACT:
A piston assembly that is movable back and forth parallel to its axis in a cylindrical housing, comprising a piston-like support part made of a hard material and a guide ring made of a polymer. The guide ring surrounds the support part along a portion of the axial length of the piston. The support part and the guide ring are joined to each other via frictional and/or form locking provided by mating between grooves on the support part and a corresponding number of radial projections on the guide ring. A set of axially spaced apart sealing lips, integrally molded with the guide ring, extends axially beyond the grooves to provide a seal with respect to the cylinder wall.

REFERENCES:
patent: 1802281 (1931-04-01), Shimer
patent: 3212411 (1965-10-01), Storms
patent: 4484512 (1984-11-01), Dechavanne
patent: 5345860 (1994-09-01), Bowell
patent: 5435233 (1995-07-01), Bowell
patent: 5520092 (1996-05-01), Iida et al.

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