Roof drill bit

Details Roof drill bit Roof drill bit

E - Fixed Constructions

21

B

255/62

E21B 17/00 (2006.01)

Patent

CA 1097332

ABSTRACT: An improved drill bit for the mining field for use as a roof drill, tunnel drill, rock boring and highway construction, both as a rotary and a ro- tary percussion drill, which includes a drill head with a diametrical slot positioning a brazed cutting blade, the head having a male drive shank to interfit with a female driver tube and having axial passages leading to chip slash pockets for removal of chips either by incoming pressure fluid or outgoing suc- tioning action. The supporting prongs of the drill head on opposite sides and at opposite ends of the blade are narrowed in thickness to provide chip clear- ance and designed to overlap centrally to provide tip strength and central support for the blade.

310232

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