US PATENT SUBCLASS 269 / 240
.~.~ Screw-nut type

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.~.~ Screw-nut type {6}
241  DF  .~.~.~> Differentially threaded
242  DF  .~.~.~> Right and left threaded
243  DF  .~.~.~> Rotating nut means
244  DF  .~.~.~> Screw held at ends for rotation only
245  DF  .~.~.~> With means for relative rotation of elements
246  DF  .~.~.~> Screw travels with jaw {4}

DEFINITION

Classification: 269/240

(under subclass 216) Device wherein the actuating* means includes mating concentrically threaded elements which elements are relatively rotatable about a common axis to cause relative axial movement of said elements, which relative movement is imparted to associated jaws*.

(1) Note. Included here are patents for a holder with elements of less than 360 deg. mating concentric extent. For example, the nut portion may only be a thread segment or the screw may be interrupted.

(2) Note. A worm-gear, though similar to screw-nut, does not

provide for relative rotation of mating elements about a common axis. A patent to a holder with a worm-gear actuator is therefor excluded from this subclass.

(3) Note. See (3) Note under subclass 229.

SEE OR SEARCH THIS CLASS, SUBCLASS:

172+, for patents for a holder with screw-nut actuating means including means to adjust jaws by relative axial shift of the threaded elements. 189, for patents for a holder with screw-nut actuating means which also lock the jaw adjustment.

223, for patents for a holder with plural actuating means for one jaw, one of which is of the screw-nut type.

225+, for patents for a holder with gear type (other than screw-nut) actuating means.

SEE OR SEARCH CLASS

74, Machine Element or Mechanism,

424.8, for patents for screw-nut type gearing, per se.