Patent ID: 7070367
Filing Date: 2006-07-04
Classification: B23B,Y10S,Y10T

Abstract:
1. A replaceable drill insert configured to be removably attached to a drill shaft, said drill insert comprising: a drill tip being configured to cut an object; an extending portion being configured to extend into a recess in a drill shaft to removably attach said drill insert to a drill shaft and to hold said drill insert in a drill shaft during drilling; said extending portion comprising at least one projection; said at least one projection being in the shape of a portion of a screw thread and being disposed to run less than 180 degrees around a section of the perimeter of said extending portion; said at least one projection being configured to project into and engage a grooved portion in a recess in a drill shaft; and said drill insert being configured to be relatively rotated with a drill shaft, upon insertion of said drill insert into a recess in a drill shaft, less than 180 degrees to engage a grooved portion of a recess in a drill shaft with said at least one projection to screw together said drill insert and a drill shaft to tighten and sufficiently firmly seat said drill insert in a drill shaft to prepare a drill for drilling; and said at least one projection forms a substantial portion of said extending portion.