US PATENT SUBCLASS 173 / 4
.~ Tool advance causing or controlling 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.~ Tool advance causing or controlling means {2}
5  DF  .~.~> Responsive to torque or speed condition of drive {3}
10  DF  .~.~> Responsive to length of stroke of means reciprocating hammer head or tool

DEFINITION

Classification: 173/4

(under subclass 2) Apparatus in which the sensed condition of operation controls a power operated means to initiate, modify, or terminate the operation of the means to positively cause or progressively control the forward movement of the tool into or along the work.

SEE OR SEARCH CLASS

408, Cutting by Use of Rotating Axially Moving Tool,

5+, and 8+ for a boring or drilling machine having automatic or tool position control of tool movement.