Implements or apparatus for applying pushing or pulling force – Single throw lever – Mechanically actuated
Patent
1988-12-05
1990-04-24
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Single throw lever
Mechanically actuated
254DIG2, B66F 312
Patent
active
049193929
ABSTRACT:
Disclosed is a vehicle jack comprising a stand having an upper and a lower end and a lift arm having one end pivotably connected to the stand intermediate the upper and lower ends, the lift arm is moveable between a first position and a second position, and has a free end with a vehicle contact plate connected thereto. A lift arm drive assembly is connected between the stand and the lift arm and includes first and second housings and an elongate screw operative therebetween. The first housing is elongate and has an end pivotally connected to the lift arm between its ends and includes thread for operative cooperation with the screw. The second housing is pivotally connected to the upper end of the stand, the elongate screw having an axis and having one end rotatably but non-translationally connected to the second housing for rotation about the axis. The other end of the screw is threadably connected to the first housing. Drive means is connectible to the screw one end for selectively causing rotation of the screw in either direction, whereby selective rotation of the screw causes telescopic movement between the screw and the first housing and controls movement of the lift arm between the two positions.
REFERENCES:
patent: Re30640 (1981-06-01), Keiholz
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patent: 3997143 (1976-12-01), Rose
patent: 4093182 (1978-06-01), Rutenbeck
patent: 4194725 (1980-03-01), Erschens
patent: 4289300 (1981-09-01), Weisser et al.
patent: 4366948 (1983-01-01), Hafner
patent: 4557355 (1985-12-01), Wilke et al.
patent: 4653727 (1987-03-01), Chang et al.
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