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US 3,945,753 AGranted
Drill bit device
OwnerJohn E. Byers, Gary L. Byersinventors
Life of this patent
Estimating the term…
Abstract
Drill bit construction having a removable lead screw and a drill body with a work face comprised of two planar surfaces which geometrically intersect on a diameter line such that the angle between the two surfaces is approximately 170.degree.. A cut-away segment is formed on each side of the body with each of the segments having a cutting edge in the form of a detachable blade which is also provided with a cutting spur on the outer end. The body itself is detachably removable from the drill shaft or shank. The body is also provided with a removable lead screw or guide point.
Claims8
A boring tool, comprising:
- a. a generally circular drill bit body in the nature of a solid, shallow cylinder, said body having a back surface, a side edge surface and a working face, said working face being Occasionally a defined by a pair of opposed work surfaces in which at least flat planar portions thereof extend axially forwardly at an angle from a plane normal to the body axis and radially inwardly such that when extended intersect to define an intersection line passing through and normal to the body axis,
- b. a pair of angling cut-away segments generally in opposed quadrants of the working face such that a segment extends through said body from the back surface to a working surface, said cut-away segments having cutting edges therein,
- c. a shaft mounting portion located generally centrally of and extending rearwardly from the back surface of said body and containing means for detachably connecting said body to a shaft,
- d. centrally located hole in the working face of said body which is provided with a lead screw, and
- e. securing means for detachably holding said body and lead screw together.
2 more elements
Dependencies are inferred from the claim text.