US PATENT SUBCLASS 81 / 461
.~.~ Inserted portion having plural, separate, work-engaging projections

Current as of: June, 1999
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81 /   HD   TOOLS

52  DF  WRENCH, SCREWDRIVER, OR DRIVER THEREFOR {27}
436  DF  .~ Having work engaging and force exerting portion inserted into cavity (e.g., allen wrench, screwdriver) {10}
461.~.~ Inserted portion having plural, separate, work-engaging projections

DEFINITION

Classification: 81/461

Inserted portion having plural, separate, work engaging projections:

(under subclass 436) Work-engaging and strain-exerting portion having a periphery which includes two or more separate (i.e., having no common bridging structure normally contacting the contour of the cavity during the straining operation) projections which are intended to cooperate with the contour of the cavity.

SEE OR SEARCH THIS CLASS, SUBCLASS:

176.1+, for a spanner having two spaced projections adapted to engage in spaced recesses in the work to exert a twisting strain thereto.