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
1984-09-04
1985-06-04
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
254376, 242 99, 188185, 188218A, B66D 504, F16D 6510
Patent
active
045209987
ABSTRACT:
A cam following roller is one arm while a latching member is the other arm of a two-armed lever. The roller rides on the surface of a cam disk. The latch is supported by a spring in a released position relative to the stopping points of the sprocket as long as the predetermined speed limit of lowering a hoist is not exceeded. The sprocket is formed of two segments which are releasably connected with each other by screws. Brake pressure springs are arranged in the shape of a cup-spring package between the screw head and support surfaces of the sprocket segments.
When the lowering speed of the hoist is exceeded, the latch is pressed into one of the stopping points of the sprocket, said sprocket arresting, by way of a brake lining, the brake drum and the cable drum connected therewith. In order to lower the load, one of the screws is slowly released and the contact pressure of the segments and of the sprocket with its glued-on brake lining on the brake drum slowly relaxes, such that the frictional resistance of the brake lining is slowly overcome. The heat generated during the braking process leads to an expansion of the brake drum and, thereby, again to increased braking, possibly again up to the point of arrest of the lowering motion. By again slowly releasing the screws holding the sprocket segments together, the load may be easily controlled and safely brought down.
REFERENCES:
patent: 2546202 (1951-03-01), Trouin
patent: 3901478 (1975-08-01), Peterson
patent: 4058271 (1977-11-01), Ubukata et al.
German Reference DE-OS 19 85 283, issue 19 from May 9, 1968, p. 1162.
Hail III Joseph J.
Levy Stuart S.
Mannesmann Aktiengesellschaft
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