US PATENT SUBCLASS 81 / 448
.~.~.~ Having resilient or spring biased component

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}
442  DF  .~.~ Inserted portion having relatively movable components {3}
448.~.~.~ Having resilient or spring biased component {1}
449  DF  .~.~.~.~> Biased component rotated about axis collinear to rotational axis of tool

DEFINITION

Classification: 81/448

Having resilient or spring biased component:

(under subclass 442) Wrench or screwdriver in which at least one of the components is either (a) constructed to be resilient, (b) made from a resilient material, or (c) is attached to a spring which pulls it toward its initial position before relative movement.