Roof drill bit

Details Roof drill bit Roof drill bit

1978-05-30

1979-08-28

Pate, III, William

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175411, E21B 902, E21C 114

Patent

active

041657900

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 rotary 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 suctioning 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 clearance and designed to overlap centrally to provide tip strength and central support for the blade.

REFERENCES:
patent: 2756967 (1956-07-01), Meutsch
patent: 3106972 (1963-10-01), Thornsberry
patent: 3163246 (1964-12-01), Vagins et al.
patent: 3187825 (1965-06-01), Bower, Jr.
patent: 3434554 (1969-03-01), Bower, Jr.
patent: 3867515 (1974-04-01), Evans

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