Crane claw tilt sensing and recovery

Details Crane claw tilt sensing and recovery Crane claw tilt sensing and recovery

1991-12-20

1994-10-25

Crowder, Clifford D.

Implements or apparatus for applying pushing or pulling force

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

Device includes rotatably driven, cable contacting drum

212147, 212153, 273448, B66C 1306, B66D 156, A63H 1712

Patent

active

053582195

ABSTRACT:
A crane claw tilt switch in addition to a cable tension switch is used to prevent a crane claw from becoming entangled in its suspending cable. When the claw lands on the floor or some other object, it either comes to rest or starts to tilt. If it comes to rest, further lowering creates cable slack, operating the tension switch. If it starts to tilt, the tilt switch operates before the claw tilts enough to allow an arm of the claw to catch on the cable. In response to the operation of either switch, a system processor commands the claw to automatically raise, ensuring that it does not become entangled in its cable.

REFERENCES:
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patent: 3043444 (1962-07-01), Melton
patent: 3743107 (1973-07-01), Verschoof
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patent: 4376487 (1983-01-01), Van Soest et al.
patent: 4684128 (1987-08-01), Verstraeten
patent: 4710819 (1987-12-01), Brown
patent: 4842150 (1989-06-01), Potocnjak
patent: 4883184 (1989-11-01), Albus

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