Implements or apparatus for applying pushing or pulling force – Single throw lever – Lazy tongs
Patent
1988-12-08
1990-02-13
Hartman, Judy
Implements or apparatus for applying pushing or pulling force
Single throw lever
Lazy tongs
254124, B66F 322
Patent
active
048999873
ABSTRACT:
The scissor lift has two parallel sets of legs. Each set has one end of an inner leg pivoted on a base and the other end slideable on the elevating platform. One end of the outer leg of each set is pivotally connected to the platform while the other end slides on the base. The mid portion of the legs are pivotally connected on a pin which also supports a crank which can rotate about 90.degree. between a first generally horizontal position in which the actuated end of the crank is eccentric to an imaginary line connecting the pivot pin and the pivot of a ram which actuates the end of the crank. Initial actuation of the crank 90.degree. raises the pivot pin and the actuated end of the crank to increase the mechanical advantage of the ram. The angle of the ram now has adequate uplift to be as effective as the prior art while requiring about 1/2 the storage height. A stop bar is pivoted on the pivot pin and has a free end or tail slideable along the base as the pivot pin rises. A plurality of spaced stops are welded on the base along the path of the tail and are engaged by the stop bar as the lift is lowered due to pressure loss or failure to actuate a control cable to lift the lock bar over the stops.
REFERENCES:
patent: 3150784 (1964-09-01), Rothe
patent: 4221280 (1980-09-01), Richards
patent: 4447042 (1984-05-01), Masui
patent: 4753419 (1988-06-01), Johansson
Hartman Judy
Hein-Werner Corporation
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