US PATENT SUBCLASS 29 / 258
.~.~.~ Central screw, work-engagers around screw

Current as of: June, 1999
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29 /   HD   METAL WORKING

700  DF  MEANS TO ASSEMBLE OR DISASSEMBLE {55}
244  DF  .~ Puller or pusher means, contained force multiplying operator {11}
256  DF  .~.~ Having screw operator {2}
258.~.~.~ Central screw, work-engagers around screw {3}
259  DF  .~.~.~.~> Work-engager arms along or parallel to screw {3}
263  DF  .~.~.~.~> Tubular or tube segment forms work-engager {2}
266  DF  .~.~.~.~> Plate or bar forms work-engager

DEFINITION

Classification: 29/258

Central screw, work-engagers around screw:

(under subclass 256) Apparatus in which a central screw develops the assembling or disassembling force, whether motivated by turning the nut or screw, and which have work engagers on opposite sides of, adjacent to, and around the screw, the screw acting on one part of the article and the engagers acting on another part of the article.

(1) Note. The side engagers may be arms on each side of the screw or constitute tubular or tube segment engagers encircling a major part of the screw, and the same may be secured to or have reaction contact with the article.