US 5,074,176 AGranted

Threading machine chuck

AssigneeEmerson Electric Co.

InventorsJames C. Redman, Michael R. Sanner, Paul W. Gress

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Abstract

A rotatable chuck for supporting a plastic coated workpiece in a power driven threading machine is disclosed comprising workpiece engaging jaws mounted on the machine spindle for rotation therewith and for pivotal movement relative thereto radially inwardly and outwardly of the spindle axis. Each jaw pivotally supports an insert holder provided with a pair of inserts for engaging the outer surface of the workpiece. Each of the insert holders pivotally supports a centering link associated with an adjacent jaw so as to be actuated in response to pivotal displacement of the jaws radially inwardly of the spindle axis to control the attitude of the insert holders so that the inserts are directed radially inwardly of the spindle axis to assure a uniform gripping action by the two inserts of each holder upon engagement with the workpiece. The centering links also displace the workpiece to a centered position coaxial with the spindle axis during inward displacement of the jaws.

Claims39

Dependent claims

In a workpiece chuck having a first axis and including tubular support means having a workpiece receiving opening coaxial with said first axis, a plurality of jaws circumferentially spaced apart about said first axis, means supporting each said jaw on said tubular support means for pivotal movement inwardly and outwardly of said first axis about a corresponding jaw axis parallel to said first axis and radially and circumferentially fixed relative to said tubular support means, each said jaw including workpiece engaging means, and means to pivot said jaws about said jaw axes, the improvement comprising:

each said workpiece engaging means being mounted on the corresponding jaw for displacement therewith about said corresponding jaw axis and for pivotal displacement relative thereto about a second axis parallel to said corresponding jaw axis, each said workpiece engaging means having workpiece engaging end means facing said first axis, and means to position said workpiece engaging means relative to said second axes during pivotal movement of said jaws inwardly and outwardly of said first axis to confine each said workpiece engaging end means to move along a radial path toward said first axis.

Dependencies are inferred from the claim text.