Lift device of the scissor-jack type

Details Lift device of the scissor-jack type Lift device of the scissor-jack type

1984-12-07

1986-04-29

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Single throw lever

Lazy tongs

B66F 322

Patent

active

045852120

ABSTRACT:
A lifting device of the scissor-jack type comprises two arms that are midway connected by a pivot and carry a platform. One arm carries a pulley between the pivot and one end. On the other side of the pivot is a slideable cam follower. This cam follower rides on a cam surface provided on the other arm. A cable is attached to the cam follower, guided around a pulley and back to the lower end of the cam surface carrying arm. The contour of the cam surface, and the position and diameter of the pulley are chosen such that a predetermined, preferably constant, ratio between input and output is obtained.

REFERENCES:
patent: 2862689 (1958-12-01), Dalrymple et al.
patent: 3222032 (1965-12-01), Schneider
patent: 3472183 (1969-10-01), Goodman
patent: 3785462 (1974-01-01), Coad et al.

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