US PATENT SUBCLASS 81 / 457
.~.~.~.~ Member spring biased for axial movement

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  DF  .~.~.~ Having member with work underlying portion {2}
457.~.~.~.~ Member spring biased for axial movement

DEFINITION

Classification: 81/457

Member spring biased for axial movement:

(under subclass 456) Guiding means in which the member is attached to a spring and and shifts along a line parallel to the axis about which the wrench turns or twists when strain is exerted on the work, the spring returning the member to its initial position after the strain-exerting operation is concluded.