US PATENT SUBCLASS 269 / 173
.~.~.~ Split 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}
173.~.~.~ Split nut type {2}
174  DF  .~.~.~.~> With separate means for lateral motion of segments {3}
178  DF  .~.~.~.~> With screw mounted means for lateral segment motion

DEFINITION

Classification: 269/173

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

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

(2) Note. While the segments may not encompass more than 180 deg. of the threaded cylindrical member, at least two of the segments are so arranged as to lie in antipodal hemispheres.

(3) Note. In the illustration shown below jaw 3 is tilted so as to separate the nut-like thread 1 from the screw 2. [figure]

SEE OR SEARCH THIS CLASS, SUBCLASS:

181+, for patents to a holder utilizing only one segment, or plural segments all lying in a common hemisphere.