Drill bit tube

Details Drill bit tube Drill bit tube

1996-04-09

1997-10-14

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having axial, core-receiving central portion

408206, 408703, B23B 5105

Patent

active

056765010

ABSTRACT:
A drill bit includes a one-piece cylindrical drill bit tube having a longitudinal axis and defining cylindrical surfaces including an inner cylindrical surface and an outer cylindrical surface. At least one of the cylindrical surfaces is configured to include deformations comprising at least one of embossments and recesses, all of the deformations appear over an entire length of the tube. At least some of the deformations are finite over the at least one of the cylindrical surfaces, the deformations further being adapted to stiffen the tube in the longitudinal direction without additional material reinforcements being disposed on the tube. The drill bit further includes hard-metal cutting elements disposed on a front face of the tube.

REFERENCES:
patent: 1887374 (1932-11-01), Emmons
patent: 3382743 (1968-05-01), Trevathan
patent: 3495359 (1970-02-01), Smith et al.
patent: 5007777 (1991-04-01), Itokazu
patent: 5205685 (1993-04-01), Herbert
patent: 5417526 (1995-05-01), Stock et al.
patent: 5429457 (1995-07-01), Asano et al.

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