Power boring bits and method of making same

Details Power boring bits and method of making same Power boring bits and method of making same

B - Operations, Transporting

23

B

77/37

B23B 29/02 (2006.01) B23P 15/28 (2006.01) B27G 15/00 (2006.01)

Patent

CA 1062050

ABSTRACT A power boring bit is fabricated from a shaft member and a disc which has a channel extending from the circumference thereof to a coaxial aperture through which the shaft extends. The shaft has a pointed tip portion at one end which provides cutting surfaces extending from the point of the tip portion and circumsoribing a circle of rotation of maximum radtus. A generally axially extending planar shoulder portion is provided on the tip portion with the radial distance to the shoulder pertion being less thatn the maximum radius. One edge portion of the disc bonding the channel is bent to extend from the plane of the body of the disc towards the point and thereby define a cutting lip portion which has a free and providing a cutting edge extending from the periphery of the disc to closely adjacent the axial shoulder portion intermediate the width thereof and inwardly of the circle of rotation of maximum radius.

266058

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