Implements or apparatus for applying pushing or pulling force – Step-by-step traveling bar – Pawl actuated
Patent
1976-04-02
1976-11-30
Smith, Al Lawrence
Implements or apparatus for applying pushing or pulling force
Step-by-step traveling bar
Pawl actuated
B66F 108
Patent
active
039944751
ABSTRACT:
A jacking apparatus comprises a rail with an attached vertical rack having teeth with a steep front face and a sloping back. A notch is arranged in the back of each of the rack teeth. A pair of cars are slidably mounted on the rail with each car carrying a pair of latches, one of which is engageable with the front face of a rack tooth and the other with the notch in the back of that tooth. Reciprocal motion, away from and toward each other, is imparted to the cars while the latches selectively engage teeth in the rack to cause progressive incremental travel of the cars along the rail, to move a load attached to one of them.
REFERENCES:
patent: 2043141 (1936-06-01), Wilmesherr
patent: 2437078 (1948-03-01), Crane
patent: 3273859 (1966-09-01), Walli
Allen Clement H.
Hydranautics
Smith Al Lawrence
Watson Robert C.
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