US PATENT SUBCLASS 81 / 473
.~.~ Rotatable, coaxial, clutching components

Current as of: June, 1999
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81 /   HD   TOOLS

52  DF  WRENCH, SCREWDRIVER, OR DRIVER THEREFOR {27}
467  DF  .~ Responsive to torque on work {7}
473.~.~ Rotatable, coaxial, clutching components {3}
474  DF  .~.~.~> Having intermediate, disparate, interlock element
475  DF  .~.~.~> Having complementary formations
476  DF  .~.~.~> Having friction type contact surfaces

DEFINITION

Classification: 81/473

Rotatable, coaxial, clutching components:

(under subclass 467) Wrench or screwdriver in which a portion of the tool-transmitting force from an input source to the work-contacting portion includes at least two coacting rotatable components, one of the components either (a) impels the other component to rotate about the same axis of rotation with it when force is transmitted to the work below the selected value of torque, or (b) allows the other component to rotate relative to it preventing the transmittal of force from the source to the work when the selected torque is exceeded.