Rotary hammerdrill bit

Details Rotary hammerdrill bit Rotary hammerdrill bit

2007-08-21

2007-08-21

Gay, Jennifer H (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S420000, C175S420100

Reexamination Certificate

active

10978463

ABSTRACT:
A rotary hammerdrill bit for use with a percussion drilling device or a hammer drilling device, with a shank and a drill head attached to or configured on the shank, wherein a front side pointing in the advance direction of the drill head has a main cutting plate forming a main cutting axis. The main cutting plate extends over the diameter of the drill head and has a tip or tip-edge lying in the longitudinal axis of the drill bit and forms drill blades that are substantially roof-shaped and are inclined radially from the tip or tip-edge. The front side of the drill head has at least one pair of cutting pins, wherein the cutting pins are arranged on the drill head in essentially the same radial positions.

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