Drill with disposable inserts

Details Drill with disposable inserts Drill with disposable inserts

1982-09-27

1985-12-17

Briggs, William R.

Cutting by use of rotating axially moving tool

Tool-support with means to permit positioning of the tool...

407113, 408223, 408713, B23B 5100

Patent

active

045589755

ABSTRACT:
The present invention provides a drilling tool having a shank and at least one pair of identical cutting inserts, the inserts having an octagonal shape having alternate equal obtuse angles. Each of the inserts is arranged such that they each have a different radial displacement from the turning axis of the drill, the inner insert having a cutting path which overlaps the turning axis of the drill and the next outer insert having a cutting path which overlaps the cutting path of the inner insert. The cutting path of each insert is formed by the cutting edges either side of the obtuse angles of the insert.

REFERENCES:
patent: 3187406 (1965-06-01), Franko
patent: 3271842 (1966-09-01), Breuning
patent: 3381349 (1968-05-01), Mewcomer
patent: 3802041 (1974-04-01), Swann
patent: 3878905 (1975-04-01), Schaumann
patent: 4105357 (1978-08-01), Kehl
patent: 4124328 (1978-11-01), Hopkins
patent: 4149821 (1979-04-01), Faber
patent: 4215957 (1980-07-01), Holma et al.
patent: 4220429 (1980-09-01), Powers et al.
patent: 4230429 (1980-10-01), Eckle
patent: 4268198 (1981-05-01), Peters
patent: 4359300 (1982-11-01), Hazra et al.

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