Exercise devices – User manipulated force resisting apparatus – component... – Utilizing fluid resistance
Patent
1996-08-20
1997-04-08
Donnelly, Jerome
Exercise devices
User manipulated force resisting apparatus, component...
Utilizing fluid resistance
482111, 482113, A63B 21008
Patent
active
056182481
ABSTRACT:
A double-acting hydraulic cylinder consists of a cylindrical body having an inner wall and an outer wall and a piston rod attached with a piston movably mounted within the inner wall and dividing a space within the inner wall into a rear chamber and a front chamber. A rear seat is mounted on a rear end of the body and defines a first bypass communicating a first space between the inner and outer walls with the rear chamber. A front seat is mounted on a front end of the body and defines a second bypass communicating the first space and the front chamber and a first control channel and a second control channel which communicate with each other at a common end by a communicating channel in communication with the first space. A sleeve is rotatably mounted on the piston rod and comprises a first passage in communication with the front chamber, a second passage in communication with first passage and the first control channel and a third passage in communication with the second control channel and a communicating tube which extends in the first space and communicates the third passage with the rear chamber.
REFERENCES:
patent: 4801139 (1989-01-01), Vanhoutte et al.
patent: 5011142 (1991-04-01), Eckler
patent: 5397287 (1995-03-01), Lindfors
Donnelly Jerome
Pelton William E.
Richman Glenn E.
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