Overload protection apparatus for hoisting machine

Details Overload protection apparatus for hoisting machine Overload protection apparatus for hoisting machine

B - Operations, Transporting

66

D

254/87

B66D 1/00 (2006.01) B66D 1/58 (2006.01)

Patent

CA 1062232

OVERLOAD PROTECTION APPARATUS FOR HOISTING MACHINE Abstract of the Disclosure An overload protection apparatus for a hoisting machine such as a rope hoist or chain block employs a gear mechanism in the reduction gear train of the machine. Such gear mechanism is composed of outer and inner gear units be- tween which torque is transmitted by means of springs there- between. The springs are compressed upon transmission of an excessively large torque, i.e. in case of an overload. This allows relative rotational movement between the outer and the inner gear units. This relative rotational movement is then converted into an axial movement. A detecting switch, upon detecting this axial movement, open an electric circuit to stop the lifting operation. -1-

275300

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