Handling: hand and hoist-line implements – Grapple – Pivoted jaws
Patent
1982-02-03
1984-10-23
Cherry, Johnny D.
Handling: hand and hoist-line implements
Grapple
Pivoted jaws
294 86R, 294DIG2, B25J 1500, B66C 142
Patent
active
044784511
ABSTRACT:
Mechanically operated tongs for gripping round objects comprise a pair of uniformly swivelable tong arms the forward ends of which have gripping surfaces adapted to engage the round objects. The gripping surfaces of each tong are comprised by two surfaces disposed at an obtuse angle to each other. The surface farthest from the pivot point of the tong is concave and the surface closest to the pivot point of the tong is convex, with such a configuration that the distance from a line interconnecting the contact points of the two concave surfaces to the center of the round object is substantially equal to the distance from the center of the object to a line interconnecting the contact points of the two convex surfaces, over a wide range of different diameters of round objects. The convex and concave surfaces can be smoothly curved or else comprised of a plurality of short linear portions. In this way, what would otherwise be the centering error of tongs whose pivot points are fixed, when used to grip round objects of various diameters, is overcome.
REFERENCES:
patent: 2665162 (1954-01-01), Moore et al.
patent: 3521923 (1970-07-01), Noel
patent: 3697115 (1972-10-01), La Beck
Brucher Eberhard
Schussler Karl-Heinz
Cherry Johnny D.
Dango & Dienenthal Maschinenbau GmbH
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