Overload protection device in air-operated lifting devices

Details Overload protection device in air-operated lifting devices Overload protection device in air-operated lifting devices

1978-11-17

1980-10-07

McCarthy, Edward J.

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

B66D 148

Patent

active

042264030

ABSTRACT:
An overload protection device for preventing excess of allowed workload in air-operated lifting devices. A braking device is associated with a drum around which a wire is wound. Upon actuation of a control valve which controls the supply of air to a drive motor, the braking device is released. If the lifting device is overloaded, then a main valve is adjusted by means of a load sensing device and the braking device is applied by venting through the main valve.

REFERENCES:
patent: 1019851 (1912-03-01), Single
patent: 2512055 (1950-06-01), Dillon
patent: 2908853 (1959-10-01), Laky
patent: 3309066 (1967-03-01), Carlson

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