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
1985-04-26
1990-07-03
Hail, III, Joseph J.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
188 822, 188 8234, 188134, 254378, B66D 316, B66D 508, F16D 6300
Patent
active
049384546
ABSTRACT:
A pair of axially aligned input and output shafts are jornalled from a frame supporting a brake drum about the output shaft and the output shaft mounts two pairs of diametrically opposite brake shoes therefrom spring biased into friction braking relation with the inner surfaces of the drum. One pair of brake shoes are of the self-energizing type to brake the output shaft against rotation in one direction relative to the drum and the other pair of shoes are of the self-energizing type for frictionally braking the shaft against rotation in the other direction relative to the drum. Connecting structure is provided establishing a limited loss motion connection between the shafts and includes control structure to release one pair of the brake shoes responsive to torque input to the input shaft above a predetermined minimum in the first direction and to release the other pair of brake shoes responsive to an equal amount of torque input to the input shaft in the opposite direction. Further, brake release structure is provided for shifting all of the brake shoes toward release positions thereof only when torque loading on the output shaft in either direction is below a predetermined low value.
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Hail III Joseph J.
Jones Maurice
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