Pressure tube piston unit

Details Pressure tube piston unit Pressure tube piston unit

1990-09-18

1992-08-11

Oberleitner, Robert J.

Brakes

Internal-resistance motion retarder

Resistance alters relative to direction of thrust member

F16F 950

Patent

active

051371243

ABSTRACT:
A pressure tube piston unit (10) with a pressure tube (11) which is subdivided into a first working space (14) and a second working space (15) by a piston (12) adapted to be extended and retracted on a piston rod (13). The two working spaces are adapted to be in a lockable flow connection with each other via an externally actuable valve arrangement (18). The piston (12) is radially externally provided with an encircling groove (19) and a packing ring (20) is inserted into the groove. The groove (19) is provided with a radially inwardly directed widened portion, the widening being of a predeterminable height. The packing ring (20) inserted into the bottom of the groove (19) is capable of being displaced axially into the widened portion.

REFERENCES:
patent: 2595426 (1952-03-01), Thornhill
patent: 3976287 (1976-08-01), Kendall et al.
patent: 4307875 (1981-12-01), Schnitzuis
patent: 4632228 (1986-12-01), Oster et al.
patent: 4796871 (1989-01-01), Bauer et al.

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