US PATENT SUBCLASS 175 / 295
.~ With noncutting portion forwardly of sleeve impact member having a cutting portion (e.g., reamer)

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}
295.~ With noncutting portion forwardly of sleeve impact member having a cutting portion (e.g., reamer)

DEFINITION

Classification: 175/295

(under subclass 293) Apparatus in which the hammer or impact device comprises an outer sleeve provided with cutting edges and mounted for longitudinal sliding movement on a shaft, said shaft having a portion extending forwardly of said sleeve which has a noncutting function.

SEE OR SEARCH THIS CLASS, SUBCLASS:

406+, and the search there noted for a device having a noncutting portion forwardly of a cutting portion.