Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1985-06-26
1986-09-16
Levy, Stuart S.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
254333, 254342, 254356, 254371, B66D 114, B66D 130, B66D 504, F16H 128
Patent
active
046117873
ABSTRACT:
This scaffold hoist uses a transmission mechanism whose output shafts are fastened to the hoist housing, and whose case rotates, carrying a sheave which impels the mechanism along the cable. The transmission mechanism is advantageously a quadrant drive for extremely high torque-to-weight ratio.
The sheave has a peripheral groove, tapered and deep enough to seat a cable having any of three different diameters, at different depths in the groove.
The cable wraps around three-fourths of the sheave. Around five-eighths of the sheave, a chain presses the cable into the groove. The chain rollers enter the groove deeply enough to engage even the smallest-diameter cables of interest, while clearing the sheave periphery. The chain side bars ride along the sides of the sheave, holding the chain and cable in position.
A resettable overspeed brake uses a rotary cam that jams a cable of any of the three sizes, at correspondingly various cam angles. The cam is cocked out of contact with the cable, and immediately spring-driven against the cable when triggered by a centrifugal sensor. A backup block--which keeps the cable from retreating from the cam--slides away from the cable at an angle during resetting, to facilitate unjamming the cable by moderate force.
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Bayorgeon Jeffrey T.
Billings Robert C.
Kendall Harry A.
May Marvin M.
Hail III Joseph J.
Levy Stuart S.
Power Climber, Incorporated
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