Scissor jack

Details Scissor jack Scissor jack

1993-11-24

1994-11-15

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

254124, 254 93H, B66F 300

Patent

active

053640713

ABSTRACT:
A scissor jack includes a base, an oil reservoir, a pumping unit, an oil pressure cylinder, two lift arm units, a connecting rod provided between a lower arm of each lift arm unit and the top of a piston rod of the oil pressure cylinder, a handle provided to operate the pumping unit to send the oil in the reservoir to the oil pressure cylinder to move the two lift arm units up for lifting an object on the jack, two rollers fixed at both ends of a shaft sustained at an intermediate portion of each lower arm to sit on the ground when the lift arm units are lowered down to the lowest position to roll on the ground, and a spring being provided between an upper arm and each lower arm for stabilizing going-down movement of the lift arm units.

REFERENCES:
patent: 2937850 (1960-05-01), Winkler et al.
patent: 3806093 (1974-04-01), Itazu
patent: 4681299 (1987-07-01), Siebert

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