US PATENT SUBCLASS 269 / 253
.~.~.~.~.~.~ Plural traveling elements coplanar with screw

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

86  DF  RELATIVELY MOVABLE JAWS {25}
216  DF  .~ Means to actuate jaw(s) (i.e., apply holding force) {10}
240  DF  .~.~ Screw-nut type {6}
246  DF  .~.~.~ Screw travels with jaw {4}
250  DF  .~.~.~.~ Means to keep faces parallel and/or translate jaw {2}
252  DF  .~.~.~.~.~ Traveling means parallel to screw {1}
253.~.~.~.~.~.~ Plural traveling elements coplanar with screw

DEFINITION

Classification: 269/253

(under subclass 252) Device including two or more traveling elements parallel to the screw and also lying in a common straight plane.

(1) Note. In the illustration below bars 2 and 3 are the traveling elements used to maintain parallelism. [figure]