US PATENT SUBCLASS 81 / 456
.~.~.~ Having member with work underlying portion

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}
451  DF  .~.~ With separate means for guiding or gripping work {3}
456.~.~.~ Having member with work underlying portion {2}
457  DF  .~.~.~.~> Member spring biased for axial movement
458  DF  .~.~.~.~> Resilient member

DEFINITION

Classification: 81/456

Having member with work underlying portion:

(under subclass 451) Guiding means having at least one member provided with a work-contacting portion which is intended to be located beneath a section of the work (e.g., screw head) during the strain-exerting operation.