US PATENT SUBCLASS 81 / 58.4
.~.~ Positive two-way drive (e.g., dog clutch)

Current as of: June, 1999
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81 /   HD   TOOLS

52  DF  WRENCH, SCREWDRIVER, OR DRIVER THEREFOR {27}
58  DF  .~ Handle clutched to head {7}
58.4.~.~ Positive two-way drive (e.g., dog clutch)

DEFINITION

Classification: 81/58.4

(under subclass 58) Wrench or screwdriver wherein the interengaging means when engaged rigidly connect the two parts to provide for positively driving the head in either or both directions of rotation.