Overload preventing apparatus in hoist

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

Reexamination Certificate

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Details

C254S358000, C254S342000, C254S347000, C254S350000

Reexamination Certificate

active

07575223

ABSTRACT:
An overload preventing apparatus of a hoist characterized in including a drive shaft2for driving a load sheave1, a pressure receiving member4outwardly fitted to the drive shaft2, a drive member10for transmitting a drive force from operating means14to the drive shaft2by way of the pressure receiving member4, a rotation drive member12including means of transmitting the drive force from the operating means14to the drive member10and releasing an engagement with the drive portion10when the operating means14is applied with a torque equal to or larger than a predetermined torque value and an elastic member13mounted along an axial direction of the drive member between a back face of the rotation drive member12and an inner side end face of the operating means14to pose a problem that a belleville spring is obliged to be used as urging means, and therefore, a stroke in the axial direction of the urging means is small, also a height of an engaging claw becomes small in accordance with the stroke of the belleville spring and a variation in a load relative to a height of the claw becomes large.

REFERENCES:
patent: 4664357 (1987-05-01), Nishimura
patent: 5899441 (1999-05-01), Kuivamaki et al.
patent: 6352243 (2002-03-01), Samejima
patent: 6517054 (2003-02-01), Samejima
patent: 14-8107 (1939-06-01), None
patent: 56-165695 (1981-12-01), None
patent: 60-202093 (1985-10-01), None
patent: 3096290 (2000-08-01), None
patent: 2000-351584 (2000-12-01), None
International Search Report for PCT/JP2006/303981 mailed Jun. 20, 2006.

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