Blast hole grooving bit and wear resistant compact
AssigneeKennametal Inc.
InventorClyde H. Hutzell
Life of this patent
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Abstract
A blast hole drill bit is disclosed for forming longitudinally extending grooves in already drilled blast holes, having a body with a forward face and a rearwardly extending pilot diameter. One or more radially extending wings are located at the rearmost part of the pilot diameter and are V-shaped when viewed in plan. Wear resistant compacts form a part of the wings and have a V-shaped cutting edge.
Claims19
A blast hole drill bit which comprises an elongate body with opposing ends with one end adapted to be attached and driven by a drill and the other end having a face that extends foremost into the hole, a pilot diameter extending rearwardly from said face, and a grooving wing extending radially outwardly from said pilot diameter, said grooving wing comprising a recess formed longitudinally from said forward face rearwardly in said body and ending in a seat that is transverse to the longitudinal axis of said body, and a wear compact mounted on said seat and in said recess and extending radially outwardly from said pilot diameter.
A hard wear resistant compact designed to be mounted on the periphery of a grooving bit which is to be nonrotatably driven in a blast hole so as to form a V-shaped notch in the wall of a blast hole, said compact comprising:
- a forward impact face;
- a side clearance face angularly related to, and extending rearwardly from, said forward impact face;
- said side clearance face having a V-shaped configuration as viewed from a forward direction;
- a cutting edge which determines the shape of the notch, and forms a juncture between said forward impact face and said side clearance face;
- a side mounting face adjacent said side clearance face, joining and extending rearwardly from said forward impact face and joining said side clearance face;
- and a rear mounting face joining portions of said side clearance face and said side mounting face.
Dependencies are inferred from the claim text.