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

B - Operations, Transporting

23

B

B23B 51/02 (2006.01) E21B 10/44 (2006.01)

Patent

CA 2048412

ABSTRACT OF THE DISCLOSURE 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° to form a cross member with cutting edges on the drilling dust grooves. - 1 -

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