Work holders – Relatively movable jaws – Jaw features
Patent
1980-05-27
1982-09-21
Godici, Nicholas P.
Work holders
Relatively movable jaws
Jaw features
269131, 269168, 408121, 408138, B23G 504
Patent
active
043499317
ABSTRACT:
A tool couple which is used with a manually-operated threading die to aid in cutting the initial threads on a pipe or bolt. The device is used to force the anterior cutting edge of the die firmly against the outer, unthreaded surface of the workpiece at the outset of a threading operation. The die is kept wedged, as the initial threads are being cut, between the workpiece and a rotatable member of the tool couple so that the die cannot slip backward toward the leading edge of the workpiece. To keep the die so wedged, the rotatable member is advanced in the direction of the end of the workpiece at approximately the same rate as the die is moved along the longitudinal axis of the workpiece. By maintaining the anterior cutting edge of the die in juxtaposition to the advancing edge of the thread, the device prevents a chamfering of the leading edge of the workpiece as the threading die is turned. The rotatable member, which rotates at substantially the same rate as the die, dissipates torque developed during the threading operation which would otherwise tend to twist the frame of the tool couple. The frame is pivotally connected to the tail-piece of a base which may be attached to the workpiece itself; alternately, the base may be bolted to a work bench on which a bench chain vise is mounted. The frame can be swung out of the way once sufficient threads have been cut on the end of the workpiece to hold the threading die in place without additional support.
REFERENCES:
patent: 705932 (1902-07-01), Kennedy
patent: 1783713 (1930-12-01), Holman
patent: 2168126 (1939-08-01), Kane
patent: 2492783 (1949-12-01), Chamberlain
patent: 2549820 (1951-04-01), Kinzle
patent: 2551652 (1951-05-01), Vreeland
patent: 2821775 (1958-02-01), Pauelka
patent: 2916812 (1959-12-01), Milo
patent: 3675303 (1972-07-01), McKinnon
patent: 4083624 (1978-04-01), Timmer
Godici Nicholas P.
Leon V. L.
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