Handling: hand and hoist-line implements – Grapple – Pivoted jaws
Patent
1988-01-22
1989-03-07
Marbert, James B.
Handling: hand and hoist-line implements
Grapple
Pivoted jaws
294 864, 294902, B25J 1500, B66L 142
Patent
active
048100196
ABSTRACT:
Mechanically operated collet chuck for gripping round objects. Especially in automatic, program-controlled installations for the successive machining of round workpieces, a centered gripping of the round objects, which are changing in diameter, is important. The centering error occurring in case of a collet-carrying machine which remains stationary is compensated for by means of link quadrilaterals (3, 8, 10, 12) which latter cause collet jaws (9) pivotably mounted to the front ends of the collet arms (4) and forming four contact points to pivot with respect to the collet arms (4) in such a way that the contact points or contact lines come into contact with the round object (1) simultaneously, without a change in position of the machine or of the round object. The special structure of the collet chuck simplifies program control of the machining unit since the change in diameter undergone by the round object (1) is taken into account in a rugged and purely mechanical fashion by the collet which occupies only a small amount of space.
REFERENCES:
patent: 4452479 (1984-06-01), Terai et al.
patent: 4718709 (1988-01-01), Myers et al.
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