US PATENT SUBCLASS 470 / 188
.~.~.~ Taper threading

Current as of: June, 1999
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470 /   HD   THREADED, HEADED FASTENER, OR WASHER MAKING: PROCESS AND APPARATUS

183  DF  IMPLEMENT, E.G., DIE, ETC. {10}
185  DF  .~ Screw threading die {2}
187  DF  .~.~ Radial chaser {2}
188.~.~.~ Taper threading {1}
189  DF  .~.~.~.~> Having die-blade adjuster

DEFINITION

Classification: 470/188

Taper threading:

(under subclass 187) Subject matter wherein the device comprises a structure are capable of gradually receding during a threading operation thereby producing a tapered thread wherein said receding is effected either by a mechanism which moves the device away from the blank or stock material or which controls the withdrawal of the device from the blank or stock material due to pressure created by the threading operation.