Drill bit for use in concrete and asphalt

Details Drill bit for use in concrete and asphalt Drill bit for use in concrete and asphalt

1993-09-02

1995-01-17

Howell, Daniel W.

Cutting by use of rotating axially moving tool

With means to apply transient, fluent medium to work or product

Including tool with duct

175323, 175395, 408230, B23B 5102

Patent

active

053821211

ABSTRACT:
A drill bit for drilling holes in concrete and asphalt, or the like, includes a circular drill bit body having two helical grooves in its cylindrical side surface. Pressurized air is injected into the drilled hole through a passage system extending longitudinally within the drill bit. The injected air is forced out of the drilled hole through the helical grooves, such that particulates formed by the drilling process are flushed with the air out of the hole. The flushing action prevents the bit from becoming immobilized by heated asphalt sticking against the drill bit side surface.

REFERENCES:
patent: 2733943 (1956-02-01), Nater
patent: 4210215 (1980-07-01), Peetz et al.
Tool and Manufacturing Engineers Handbook, Fourth Edition, vol. 1, Machining, Society of Manufacturing Engineers, 1983, p. 9.14.

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