Drill bit having bulb-like shank enlargements to reduce jamming

Details Drill bit having bulb-like shank enlargements to reduce jamming Drill bit having bulb-like shank enlargements to reduce jamming

1991-07-26

1992-03-17

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

175323, 175394, B23B 5102

Patent

active

050963449

ABSTRACT:
The drill bit for producing a cylindrical drilled hole, especially in concrete, has a shank and a drilling head at one end of the shank provided with at least one helically extending drilling dust groove. At least two bulb-like shank enlargements (6,7) are provided on the shank (5) arranged in succession axially. Each of the shank enlargements (6,7) has the same maximum diameter and the drilling head has a drilling head diameter which is at least as great as the maximum diameter of the shank enlargements (6,7). Advantageously two drilling dust grooves with semicircular cross sections are provided on the shank displaced from each other radially by about 180.degree. to form a cross member with cutting edges on the drilling dust grooves.

REFERENCES:
patent: 4080093 (1978-03-01), Maier

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