Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Adapted to 'form' recession in work
Patent
1988-09-21
1989-11-07
Bilinsky, Z. R.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Adapted to 'form' recession in work
408211, 408225, B23B 5104
Patent
active
048787868
ABSTRACT:
A drill bit is provided which has a central tine and first and second cutting tines, provided one on each side of the central tine. The lowermost end of each of the cutting tines is sharpened for cutting the stock. Thus the drill bit cores the material to form a hole thereby reducing the amount of material that must be cutaway. Further, the cutting tines are formed so as to have an enlarged distal head so that the main body portion of each of the tines has a slightly smaller cross-section than the cutting head. In this manner, friction can be reduced between the edges of the tines and the edges of the material being worked. Even further, the tine bit includes cutting blades between the central tine and the cutting tines in the event the stock is thicker than the length of the cutting tines.
REFERENCES:
patent: 613132 (1898-10-01), Fellows
patent: 679406 (1901-07-01), Watson
patent: 1359965 (1920-11-01), Claudon
patent: 1628887 (1927-05-01), Spengler
patent: 1647395 (1927-11-01), Costello
patent: 4147464 (1979-04-01), Watson et al.
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