Handling: hand and hoist-line implements – Grapple – Fixed and moveable jaw
Patent
1980-02-07
1981-03-03
Cherry, Johnny D.
Handling: hand and hoist-line implements
Grapple
Fixed and moveable jaw
B66C 144
Patent
active
042536960
ABSTRACT:
A motorized lever-action vertical axis coil grab manipulated in suspended disposition from an overhead crane by a single operator from a remote control location for clampably engaging for lifting and displacement from one location to another upright standing wrapped metal material coils of various size and dimension, with initial grab engagement of any particular coil to be moved by a motor-driven compressive clamping of the coil overply wall thickness to remove therefrom any wrap slack sponginess preparatory to tong latch release of the grab lever-acting self-gripping force translating tong linkage assembly such that no extension of the tong linkage assembly thereof will be wasted in taking up coil wrap slack but rather be substantially translated as increasing clamp compression on the coil wall thickness in a gripping force transmission sufficient to lift the coil without the convoluted laminate wrap structure thereof slipping apart upon coil elevation for movement, wherein the grab hereof further embodies as a feature thereof a tong latch load sensing switch assembly automatically operable to cut crane hoist motor power in an event where the tong latch does not properly cycle and release the lever-acting tong linkage assembly to effect a self-gripping force translation upon grab elevation of the motor-driven compressively clamped coil.
REFERENCES:
patent: 2803489 (1957-08-01), Zito et al.
patent: 2830842 (1958-04-01), Heppenstall et al.
patent: 2906555 (1959-09-01), Heppenstall
patent: 3037806 (1962-06-01), Anderson
patent: 3076674 (1963-02-01), Anderson
patent: 3153555 (1964-10-01), Kaplan et al.
Bradley Lifting Corp.
Cherry Johnny D.
Learned Jr. Samuel M.
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