US PATENT SUBCLASS 175 / 298-- .~ Continuous unidirectional rotary motion of one telescoping member effects consecutive impacts

US PATENT SUBCLASS 175 / 298
.~ Continuous unidirectional rotary motion of one telescoping member effects consecutive impacts

Current as of: June, 1999
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175 /	HD	BORING OR PENETRATING THE EARTH

293	DF	BELOW-GROUND (1) HAMMER, OR (2) IMPACT MEMBERS {7}
298		.~ Continuous unidirectional rotary motion of one telescoping member effects consecutive impacts

DEFINITION

Classification: 175/298

(under subclass 293) Apparatus in which the telescoping members are provided with means which cooperate to cause repetitive reciprocation of said members relative to each other when one member is continuously turned in the same direction about its axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

322, for telescoping shaft sections of a nonjarring type provided with cooperating means for reciprocating said sections relative to each other when one of said sections is continuously rotated in one direction.