(under subclass 327) Apparatus provided with (1) means on the bit for centralizing or stabilizing the bit in the bore or (2) a device to smooth or compress together the material which makes up the wall surface of the bore.
(1) Note. For classification under this definition the guide or compacting device must be an element other than the body of the bit which may incidentally function as a guide or compacting device. However, a modification of the bit body such as ribs or projections which are disclosed as for the purpose set forth herein is classified under this definition.
SEE OR SEARCH THIS CLASS, SUBCLASS:
325.1+, and the search there noted for tool shafts having bore wall engaging means.
394, for a bit provided with a peripheral helical conveying portion which incidentally functions as a bit guide.
399, for a nonsymmetrical bit provided with a bore wall engaging guide.
406+, for a bit having a noncutting portion forwardly of the cutting portion, and in which said noncutting portion functions as a guide.
