Masonry drill bit

Details Masonry drill bit Masonry drill bit

1996-07-25

2000-08-15

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

175389, 175395, 175415, 1754201, 408230, B23B 5102

Patent

active

061026344

ABSTRACT:
A masonry drill bit 1 having an active diameter of D, comprising a shaft 3 and a tip 5 for engaging a workpiece, the tip 5 including a central portion 11 extending ahead of an outer portion 13, wherein the central portion 11 has a width of at least 0.25 D and is shaped to act as a chisel during percussion drilling, and wherein the outer portion 13 is shaped to cut a workpiece as the drill bit rotates. By virtue of the drill bit tip 5 configuration as described and claimed herein, a masonry drill bit 1 having improved performance is provided.

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