Rope tension damper

Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum

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Details

242155R, 254392, 254394, B65H 5926

Patent

active

047609923

ABSTRACT:
A novel rope tension damper device is adapted to be installed, for example, at a location between a winch and the fairlead that guides the rope. The device comprises a co-planar pair of sheaves respectively mounted at opposite ends of a rotatable arm. The two sheaves are oriented with their respective rotational axes parallel to the rotational axis of the arm such that with the rope entering the device tangential to a point on the periphery of the first sheave and exiting the device tangential to a second point on the periphery of the second sheave, and with the arm's longitudinal axis more or less perpendicular to the orientation of the rope as it enters and exits from the device prior to the application of any tension, the rope within the device will be guided by the two sheaves into a generally S-shaped configuration which will be gradually distorted into a relatively straight configuration as the tension in the rope applies a torque couple to the arm and thereby causes it to rotate to an orientation more parallel to that of the rope outside the device. Preferably, a pair of such elastomeric torsional members are provided, one on either side of the rotatable arm and concentric with its rotational axis. Shearing forces within the elastomer serve to generate a counter-torque on the rotating inner arm, thereby causing a variable damping force to be applied to the rope as the arm and sheave assembly is rotated from its zero load position.

REFERENCES:
patent: Re30842 (1982-01-01), Speer
patent: 171354 (1875-12-01), Cooley
patent: 959667 (1910-05-01), White
patent: 2087253 (1937-07-01), Herold
patent: 3043566 (1962-07-01), Grise
patent: 3481584 (1969-12-01), Conry et al.
patent: 3511492 (1970-05-01), Galbato
patent: 3777672 (1973-12-01), Schneider
patent: 3817113 (1974-06-01), Pfarrwaller
patent: 4108508 (1978-08-01), Clinard
patent: 4349184 (1982-09-01), Peterson et al.

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