Modular drill

Details Modular drill Modular drill

2007-10-09

2008-12-23

Fridie, Willmon (Department: 3724)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

C408S144000, C408S713000

Reexamination Certificate

active

07467915

ABSTRACT:
A drill having a replaceable cutting head, modified to eliminate forces which would distort the pocket of the drill shank and otherwise concentrate stresses which would cause failure of the drill. The cutting head has a frustoconical depending connecting member received in a receptacle formed in the shank. In different embodiments, contact between the pocket formed in the shank and the cutting head connecting member is limited. In one embodiment, angle of drive surfaces is modified from prior art practice. In another embodiment, transition of at curved joints between vertical and horizontal surfaces is made more gradual. The drill preferably has flutes formed collectively by the shank and cutting head when assembled.

REFERENCES:
patent: 5957631 (1999-09-01), Hecht
patent: 6059492 (2000-05-01), Hecht
patent: 6276879 (2001-08-01), Hecht
patent: 6485235 (2002-11-01), Mast et al.
patent: 7306410 (2007-12-01), Borschert et al.
patent: 7360974 (2008-04-01), Borschert et al.

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