Traversing hoists – Overhead – Cable
Patent
1974-11-12
1976-06-15
Werner, Frank E.
Traversing hoists
Overhead
Cable
212 50, 214 1BC, 214152, B65G 4790
Patent
active
039631354
ABSTRACT:
In a method of subordinating the orientation of a grab on a Public Works machine to the angle of rotation of the turret three directions are chosen, the first two being determined by the desired orientation of the grab in the loading and unloading zones, respectively, and the third passing through the axis of rotation of the turret 2, the angle of rotation of the turret starting from the third direction is measured and compared with the angle between a straight line, passing through the point of intersection of the first two directions and the axis of rotation of the turret, makes and the third direction, the desired angle of the grab with respect to the boom in the loading or unloading zones is determined and the angle that the grab actually makes with the boom is measured and compared with the appropriate desired angle, the results of this comparison being used to control rotation of the grab to reduce the difference to zero.
REFERENCES:
patent: 2770141 (1956-11-01), Dinsmore
patent: 3007097 (1961-10-01), Shelley et al.
patent: 3337071 (1967-08-01), Clark
patent: 3698580 (1972-10-01), Carlson et al.
patent: 3840128 (1974-10-01), Swoboda, Jr. et al.
patent: 3880304 (1975-04-01), Strickland, Jr.
Eslinger Lewis H.
Sinderbrand Alvin
Societe Anonyme: Poclain
Werner Frank E.
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