Annular bit having a center drill

Details Annular bit having a center drill Annular bit having a center drill

1997-03-19

1999-08-03

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

With work-engaging structure detachable from cutting edge

408206, 175386, B23B 5104

Patent

active

059316144

ABSTRACT:
An annular bit (1) having an attachable center drill (6) is proposed, in which annular bit (1), on the one hand, reliable holding of the center drill (6) in the annular bit (1) is ensured and, in particular, distributions of the cutting segments (3) on the annular bit (1) differing from the 90.degree. symmetry are made possible. This is achieved according to the invention in that the center-drill holder (4) has at least one push-in pin (11) and the wall of the annular bit (1) has at least one recess (14, 15, 16) for accommodating the push-in pin (11), which pin and recess are formed in such a way that the push-in pin (11) is retained in the recess (14, 15, 16) in the axial direction relative to the annular-bit axis in the locked state of the center-drill holder (4).

REFERENCES:
patent: 2673717 (1954-03-01), Bacon
patent: 2816737 (1957-12-01), Kinard et al.
patent: 2853904 (1958-09-01), Mackey
patent: 2972389 (1961-02-01), Green et al.

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