Implements or apparatus for applying pushing or pulling force – Vehicle attached jack – Hydraulic or pneumatic
Patent
1991-05-21
1993-07-27
Swann, J. J.
Implements or apparatus for applying pushing or pulling force
Vehicle attached jack
Hydraulic or pneumatic
B60S 902
Patent
active
052304990
ABSTRACT:
A telescoping assembly includes an inner tubular member and an outer tubular member, each defining an internal passage. The inner and outer tubular members are mounted to each other for telescoping movement therebetween, and a pair of coaxial springs are mounted within the internal passages defined by the inner and outer tubular members. The springs act to bias the tubular members toward a retracted position. The tubular members are movable to an extended position against the force of the springs, by introduction of pressurized fluid into the internal passages defined by the inner and outer tubular members. A valve is mounted to an end of one of the tubular members, for introducing pressurized fluid into the internal passages defined by the tubular members, and for allowing fluid to be expelled therefrom under the force of the springs, for allowing the inner and outer tubular members to move to their retracted position.
REFERENCES:
patent: 1323688 (1919-12-01), Graham et al.
patent: 1548182 (1925-08-01), Burgin
patent: 1557385 (1925-10-01), Tastenhoye
patent: 1873116 (1932-08-01), Dessaint
patent: 4377190 (1983-03-01), Pierrat
patent: 4523743 (1985-06-01), Wang
Swann J. J.
Versa Technologies, Inc.
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