Masonry drill bit

Details Masonry drill bit Masonry drill bit

1997-08-06

1999-04-13

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

175394, 1754201, 408228, B23B 5102

Patent

active

058936882

ABSTRACT:
A masonry drill bit having an improved insert geometry, insert orientation, and interface clearance for providing improved drill speed and penetration rate. The drill bit is adapted for use in drilling masonry or other hard, brittle material. The drill bit has an axially elongated body with a leading front end portion and a rear end portion. The rear end portion is adapted to be held by a tool holder. The body has at least one spiral groove cast in its exterior surface substantially along its length. The insert is embedded in the leading end of the body, extending generally diametrically across the leading end of the body, and centered about a latitudinal plane of the insert. The geometric design of the insert, the orientation of the insert relative to the drill bit, and the interface clearance between the insert and the grooves, reduces friction and heat; resists wear, fractures, and abrasive actions of the chips; increases design life of the elements; and enhances debris elimination.

REFERENCES:
patent: 3447616 (1969-06-01), Granat
patent: 3469643 (1969-09-01), Ter Horst
patent: 4314616 (1982-02-01), Rauckhorst et al.
patent: 4984944 (1991-01-01), Pennington, Jr. et al.
patent: 5746095 (1998-05-01), Sohnlein

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