Implements or apparatus for applying pushing or pulling force – Hoisting truck – Rack and pinion or segment
Patent
1977-11-09
1978-10-17
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Hoisting truck
Rack and pinion or segment
214 1SW, B60P 112
Patent
active
041204840
ABSTRACT:
A device for hoisting and positioning drywall panels and the like comprising a maneuverable base, a raising and lowering mechanism extending from the base, and a panel supporting arrangement pivotally connected to the mechanism and including a pair of curved, resilient panel supporting elements each of which contacts the panel as spaced-apart locations. The raising and lowering mechanism includes three cylinders in a telescopic arrangement extending from the base, a rack and pinion combination for extending and retracting one cylinder relative to the other, and a coupling line connected at one end to a third cylinder, at the other end to the fixed one of the other cylinders, and operatively engaging the cylinder moved by the rack and pinion arrangement. Operation of the rack and pinion arrangement extends and retracts the one cylinder relative to the other and the coupling line simultaneously causes the third cylinder to be extended and retracted relative to the one cylinder.
REFERENCES:
patent: 1762397 (1930-06-01), Kinser
patent: 2983474 (1961-05-01), Hanna
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