US PATENT SUBCLASS 81 / 453
.~.~.~.~ With camming or wedging element for moving members

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}
452  DF  .~.~.~ Having resilient, relatively movable, work gripping members {1}
453.~.~.~.~ With camming or wedging element for moving members

DEFINITION

Classification: 81/453

With camming or wedging element for moving members:

(under subclass 452) Gripping means including either a rotatable camming or a shiftable wedging element having a surface which slides against and moves a cooperating surface on or attached to at least one of the members when a rotating or shifting force is applied to the element, the relative orientation or contour of one of the surfaces causing the movement transmitted to the member by the element to be in a direction other than that of the element.