Mechanical lifting jack

Details Mechanical lifting jack Mechanical lifting jack

1984-12-05

1986-02-04

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

74581, B66F 104

Patent

active

045680647

ABSTRACT:
A mechanical lifting jack has an upper lifting assembly and a lower follower assembly slidably mounted on a vertical support and engageable therewith at predetermined positions over its height. An operating handle is pivotally connected at one end to the lifting assembly for upward and downward angular movement, and a safety link is pivotally connected at an upper end to the handle and at a lower end to the follower assembly. The lifting assembly carries a reversing member operable in one position to cause a load engaged by the lifting assembly to be raised by alternate upward movement of the lifting assembly and follower assembly up the support when the handle is moved upwardly and downwardly, and operable in another position to cause a load to be lowered by alternate downward movement of the lifting assembly and follower assembly with similar movement of the handle. The safety link has a portion yieldable by deformation when the handle is moved downwardly with the reversing member in the up position and the load engaged by the lifting assembly is above a predetermined value to prevent further raising or lowering of the load.

REFERENCES:
patent: 1384270 (1921-07-01), Murphy
patent: 4379546 (1983-04-01), McIntosh

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