US PATENT SUBCLASS 173 / 17
.~.~.~ Motor piston movement modified relative to motive fluid port

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

13  DF  DRIVE CONTROLLED BY RELATIVE AXIAL MOVEMENT OF TOOL {2}
15  DF  .~ Drive motor controlled {1}
16  DF  .~.~ Modified internal motor operation {1}
17.~.~.~ Motor piston movement modified relative to motive fluid port

DEFINITION

Classification: 173/17

(under subclass 16) Apparatus in which the tool drive motor is of the cyclically operable, expansible chamber type and the path of reciprocatory movement of a motor piston is altered relative to a port which supplies fluid to a working chamber of the motor or a fluid operated distributor motor.