Dual hydraulic lifts

Details Dual hydraulic lifts Dual hydraulic lifts

1982-09-03

1985-02-19

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Vehicle attached jack

Hydraulic or pneumatic

B66F 712

Patent

active

045000719

ABSTRACT:
A dual lift for large loads such as vehicles has two lifting units set in opposition to each other to straddle the load. Each of the lifting unit has a vertical standard, cantilevered arms mounted on the standard for movement therealong, and a hydraulic actuator for raising and lowering said arm. A source of fluid under pressure such as a motor, pump, and reservoir provides fluid under pressure, transferred first to one of the actuators, and from this first actuator between it and the other in a reversible series. The first actuator functions as a master and the other actuator as a slave thereto so that actuation of the slave is synchronized directly with the operation of said master.

REFERENCES:
patent: 2909358 (1959-10-01), Southerwick
patent: 2940262 (1960-06-01), Pfitzenmeier
patent: 3143924 (1964-08-01), Pearson et al.
patent: 3355993 (1967-12-01), Williamson
patent: 3476016 (1969-11-01), Dixon et al.
patent: 4212449 (1980-07-01), Tsujimura

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