US PATENT SUBCLASS 81 / 442
.~.~ Inserted portion having relatively movable components

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.~.~ Inserted portion having relatively movable components {3}
443  DF  .~.~.~> Having camming or wedging element for moving components {2}
447  DF  .~.~.~> Having cooperating threaded element type actuating means
448  DF  .~.~.~> Having resilient or spring biased component {1}

DEFINITION

Classification: 81/442

Inserted portion having relatively movable components:

(under subclass 436) Wrench or screwdriver wherein the cavity-engaging and strain-exerting portion includes two or more relatively movable components which firmly engage the cavity when moved.

SEE OR SEARCH CLASS

166, Wells,

117.7, for means anchored against rotation in one well conduit section for relatively rotating another section.