US PATENT SUBCLASS 173 / 177
.~.~ Fluid pressure change controls drive

Current as of: June, 1999
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173 /   HD   TOOL DRIVING OR IMPACTING

2  DF  AUTOMATIC CONTROL OF POWER OPERATED MEANS {4}
176  DF  .~ Drive means responsive to torque or speed condition {5}
177.~.~ Fluid pressure change controls drive

DEFINITION

Classification: 173/177

Fluid pressure change controls drive:

(under subclass 176) Apparatus wherein the torque or speed of the device is measured by sensing the force exerted on a surface by a gas or liquid, the sensed condition effecting a valve which modifies the tool operation.