US PATENT SUBCLASS 269 / 181
.~.~.~ Half nut type

Current as of: June, 1999
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269 /   HD   WORK HOLDERS

86  DF  RELATIVELY MOVABLE JAWS {25}
165  DF  .~ Means for direct manual adjustment of jaw(s) {5}
172  DF  .~.~ With relative axial shift of screw-nut actuating means {4}
181.~.~.~ Half nut type {1}
182  DF  .~.~.~.~> With separate means for lateral nut-screw motion {1}

DEFINITION

Classification: 269/181

(under subclass 172) Device wherein the screw-nut type actuating means includes a threaded cylindrical member (hollow or solid) engaging a segment bearing a mating thread portion, with means to move the segment into and out of thread interengagement with the cylindrical member.

(1) Note. The segment is generally moved radially away from the threaded cylinder to permit relative axial shift of segment and cylinder.

(2) Note. An annular member bearing a segment (less than 180 deg.) of thread, relatively rotated to align nonthreaded portions, is not considered as an interrupted thread for subclasses 184+.

SEE OR SEARCH THIS CLASS, SUBCLASS:

173, for patents to a holder utilizing plural annular segments.