.~ Rotary drive and advance originate from same mechanical element {1}
146
.~.~ Friction clutch or torque yielding couple in connecting train
DEFINITION
Classification: 173/146
(under subclass 145) Apparatus in which the means connecting the mechanical motion converting element to the means to cause tool rotation or cause or control forward movement is provided with (1) a clutch having frictionally engaging elements or (2) a coupling which yields without breaking the drive train in response to the imposition of an excessive torque load.
