Excessive load prevention apparatus employable for a hoist or th

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

188 653, 188 827, 188 8277, 254376, B66D 158, B66D 532, F16D 6300

Patent

active

046714944

ABSTRACT:
An overload prevention apparatus includes a geared member with a number of teeth formed thereon, an engagement member including an engagement portion of which dimensions are determined so as to allow the latter to enter the valley on the geared member, a supporting member for turnably supporting the engagement member so as to allow the latter to turn toward and away from the geared member and a resilient member disposed between the engagement member and the supporting member to thrust the engagement portion on the engagement member toward the geared member. Either the geared member or the supporting member is arranged to move relative to the other. The direction of movement of the movable member is determined by the direction of extension of the teeth on the geared member. When hoisting ropes pull the movable member with excessively high force, the geared member is caused to move against thrusting force of the engagement member generated by the resilient member whereby the hoisting ropes are unreeled further. As a result, excessive energy can be successfully absorbed.

REFERENCES:
patent: 219367 (1879-09-01), Schmitt
patent: 757272 (1904-04-01), Conner
patent: 884776 (1908-04-01), Tanner
patent: 1174280 (1916-03-01), Ragsdale
patent: 2136596 (1938-11-01), Smith
patent: 3827649 (1974-08-01), Payen
patent: 4025055 (1977-05-01), Strolenberg
patent: 4542883 (1985-09-01), Rutzki

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