US PATENT SUBCLASS 173 / 9
.~.~.~ Fluid flow or pressure operated advance means

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

2  DF  AUTOMATIC CONTROL OF POWER OPERATED MEANS {4}
4  DF  .~ Tool advance causing or controlling means {2}
5  DF  .~.~ Responsive to torque or speed condition of drive {3}
9.~.~.~ Fluid flow or pressure operated advance means

DEFINITION

Classification: 173/9

(under subclass 5) Apparatus in which the means which causes or controls forward movement of the tool comprises a motor operated by fluid.

(1) Note. Included under this definition are those motors which derive power solely from the pressure or flow of a fluid stream. An internal combustion engine, for example, which may utilize a fluid fuel, but requires a chemical reaction to operate, is excluded from this definition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

8, for automatic control of tool advance causing or controlling means in response to motive fluid pressure or current sensed torque or speed condition of a drive.