US PATENT SUBCLASS 81 / 443
.~.~.~ Having camming or wedging element for moving components

Current as of: June, 1999
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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}
442  DF  .~.~ Inserted portion having relatively movable components {3}
443.~.~.~ Having camming or wedging element for moving components {2}
444  DF  .~.~.~.~> Axially shiftable element located between and wedging against components {1}
446  DF  .~.~.~.~> Rotatable element located between and camming against components

DEFINITION

Classification: 81/443

Having camming or wedging element for moving components:

(under subclass 442) Wrench or screwdriver including either a rotatable camming or shiftable wedging element having a surface which slides against and moves a cooperating surface on or attached to at least one of the components when a rotating or shifting force is applied to the element, the relative orientation or contour of one of the contacting surfaces causing the movement transmitted to the component by the element to be in a direction other than that of the element.