Low profile jack construction

Details Low profile jack construction Low profile jack construction

1982-09-30

1985-02-19

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Rack and pinion

74412TA, B66F 300

Patent

active

045000727

ABSTRACT:
A mechanical jack construction is provided comprising a load-bearing rack which is adapted to be moved in the vertical plane by an engaging pinion. The pinion is connected to a lever-driven ratchet wheel by means of shear pins. Application of an excessive load to the load-bearing rack will result in fracture of the shear pins, disengagement of the pinion from the ratchet wheel and substantially instantaneous lowering of the rack. Such construction lends itself to use in track repair and similar applications in which immediate jack retraction is desired upon engagement of excessive loads.

REFERENCES:
patent: 556625 (1896-03-01), Gilchrist
patent: 1475057 (1923-11-01), Ellingsen
patent: 1706361 (1929-03-01), Newkirk
patent: 1805879 (1931-05-01), McKenny
patent: 3435695 (1969-04-01), Rivers
patent: 3466011 (1969-09-01), Mewes et al.

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