Brakes – Internal-resistance motion retarder – Position of thrust member relative to chamber
Patent
1996-08-20
1998-09-01
Butler, Douglas C.
Brakes
Internal-resistance motion retarder
Position of thrust member relative to chamber
188315, 18832213, 188318, F16F 948
Patent
active
057997586
ABSTRACT:
A double-acting hydraulic cylinder for use in an exercising apparatus to provide a resistance to a user of the exercising apparatus is disclosed. The hydraulic cylinder comprises a cylindrical body having an inner wall and an outer wall, 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 hermetically mounted on a rear end of the body and defining a first bypass communicating a space between the inner and outer walls with the rear chamber, a first disk normally closing the first bypass, a resistance adjusting mechanism rotatably mounted in the rear seat, a front cap hermetically mounted on a front end of the body, a front seat mounted between the front cap and the body and defining a second bypass communicating the space between the inner and outer walls with the front chamber, and a communicating tube extending between the inner and outer walls and communicating the front chamber with the rear chamber and the space between the inner and outer walls via the resistance adjusting mechanism.
REFERENCES:
patent: 4291787 (1981-09-01), Brentham
patent: 4709791 (1987-12-01), Houghton
patent: 5070970 (1991-12-01), Johnston et al.
patent: 5172794 (1992-12-01), Ward
patent: 5618248 (1997-04-01), Huang
Butler Douglas C.
Pelton, Esq. William E.
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