Jack

Details Jack Jack

1982-11-30

1985-01-15

Smith, James G.

Implements or apparatus for applying pushing or pulling force

Single throw lever

Mechanically actuated

744248R, B66F 300

Patent

active

044934785

ABSTRACT:
A jack comprising a screw and a nut member, the displacement of which along the screw produces a change in the distance between the active portions of the jack. The jack has a catch which prevents collapse if the nut member, due to worn threads, loses its grip on the screw. The catch is achieved by dividing the nut member into a threaded load-carrying portion and a threaded portion which is axially unloaded during normal thread engagement and which follows the load-carrying portion and serves as a stop if the latter should lose its grip on the screw.

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