Cutting by use of rotating axially moving tool – With means to apply transient – fluent medium to work or product – Including tool with duct
Patent
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.
Cantor Frederick R.
Howell Daniel W.
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