.~ Symmetrical forked rotary type (e.g., fishtail)
DEFINITION
Classification: 175/421
(under subclass 327) Apparatus comprising a rotary type bit provided with at least two axially extending branches terminating in cutting edges, the configuration of said axially extending branches and cutting edges being such that (1) more than one plane of bilateral symmetry may be passed through an axis coinciding with the rotary axis of the bit or (2) radial symmetry is presented about an axis coinciding with the rotary axis of the bit.
(1) Note. See (1) Note of subclass 398 for definition of bilateral and radial symmetry.
SEE OR SEARCH THIS CLASS, SUBCLASS:
331+, for a rolling cutter bit in which the rolling cutters form axially extending branches.
392, for a rotary bit having a forked forwardly extending portion forming a smaller diameter initial bore.
397, for a nontracking rotary type bit having axially extending branches terminating in cutting edges.
398+, for a nonsymmetrical forked bit. 403+, and the search there noted for a core type bit having axially extending symmetrical forked portions.
414+, for an impact type bit comprising axially extending, symmetrical branches terminating in cutting edges.
