US PATENT SUBCLASS 470 / 76
.~.~.~.~.~ Forming taper thread

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

57  DF  APPARATUS FOR MAKING EXTERNALLY THREADED FASTENER OR ARTICLE, E.G., SCREW, BOLT, ETC. {2}
58  DF  .~ Screw fastener making {6}
66  DF  .~.~ Having thread cutting means {8}
73  DF  .~.~.~ Having collapsible die {4}
75  DF  .~.~.~.~ And cam operator {1}
76.~.~.~.~.~ Forming taper thread

DEFINITION

Classification: 470/76

Forming taper thread:

(under subclass 75) Subject matter wherein the apparatus is further provided with structure capable of producing a gradually smaller diameter thread from a shank portion to an end portion of the fastener.