Rotary cutting bit with material-deflecting ledge
AssigneeSandvik AB
InventorsKent Peay, Timothy J. Shean
Life of this patent
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Abstract
A cutting bit includes a steel body on which a carbide cutting tip is brazed. Disposed rearwardly of a rearwardmost end of the tip, on a tapered side surface of a head of the bit body is an annular ledge which extends laterally outwardly sufficiently far to deflect cuttings laterally away from the bit. The ledge can be formed integrally with the bit body as the result of a machining operation, or the ledge can comprise a split ring that is elastically held in a groove formed in the tapered side surface. The ledge extends perpendicularly to a center axis of the bit, or is inclined slightly forwardly, in order to trap cuttings, such as asphalt, to cause a protective ring of asphalt to be formed in front of the ledge.
Claims21
A cutting bit comprising:
- a body including a shank and a head disposed at a front end of the shank,
- the head including a forwardly facing front surface, and a tapered side surface disposed behind the front surface, the tapered side surface having a cross section which increases in a rearward direction of the head;
- and
- a cutting tip attached to the front surface of the head and formed of a harder material than the body,
- the head including a ledge projecting from the tapered surface in a laterally outward direction relative to a longitudinal axis of the body, wherein the ledge projects from the tapered surface at a location spaced rearwardly from a rearwardmost end of the tip and is oriented substantially perpendicularly to the longitudinal axis.
A cutting bit comprising:
- a body including a shank and a head disposed at a front end of the shank,
- the head including a forwardly facing front surface, and a tapered side surface disposed behind the front surface, the tapered side surface having a cross section which increases in a rearward direction of the head;
- and
- a cutting tip attached to the front surface of the head and formed of a harder material than the body,
- the head including a ledge projecting in a laterally outward direction relative to a longitudinal axis of the body, wherein the ledge projects from the tapered surface at a location spaced rearwardly from a rearwardmost end of the tip, a laterally outer end of the ledge being disposed no farther rearwardly than a laterally inner end of the ledge.
A cutting bit comprising:
- a body including a shank and a head disposed at a front end of the shank,
- the head including a forwardly facing front surface, and a tapered side surface disposed behind the front surface, the tapered side surface having a cross section which increases in a rearward direction of the head;
- and
- a cutting tip attached to the front surface of the head and formed of a harder material than the body,
- the head including a ledge projecting from the tapered surface in a laterally outward direction relative to a longitudinal axis of the body, the ledge formed by machining the bit body, wherein the ledge is of integral one-piece construction with the head, the ledge being inclined forwardly from the tapered surface and extending from the tapered surface at a location spaced rearwardly from the rearwardmost end of the tip, the ledge projecting from the tapered surface by a distance greater than 10% of a radius of the tapered surface as measured at an intersection of the ledge with the tapered surface.
Dependencies are inferred from the claim text.