US PATENT SUBCLASS 227 / 134
.~.~ Spring-retracting means

Current as of: June, 1999
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227 /   HD   ELONGATED-MEMBER-DRIVING APPARATUS

107  DF  WITH MEANS TO MOVE OR GUIDE MEMBER INTO DRIVING POSITION {11}
120  DF  .~ Including supply magazine for constantly urged members {8}
134.~.~ Spring-retracting means

DEFINITION

Classification: 227/134

(under subclass 120) Device comprising a resilient element which opposes the motion of the driver during the driving stroke and which returns the driver to its initial or nondriving position.