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US 8,002,054 B2Granted
Roof drill bit, roof drill bit body and hard cutting insert for roof drill bit
AssigneeKennametl Inc.
InventorsChad A. Swope, Douglas E. Bise, Kris E. Strothmann, Tod D. Hill
Life of this patent
Estimating the term…
Abstract
A roof drill bit has an elongate roof drill bit body, which has a forward end and a rearward end. The roof drill bit body contains a slot at the forward end. The roof drill bit body contains a dust port wherein the dust port has a central longitudinal dust axis. The roof drill bit further has a hard insert received within the slot wherein the hard insert has a leading surface. The leading surface of the hard insert is rotationally forward of the central longitudinal dust axis of the dust port.
Claims17
A roof drill bit comprising:
- an elongate roof drill bit body having a forward end and a rearward end, the roof drill bit body containing a slot at the forward end, and the roof drill bit body containing a dust port wherein the dust port having a central longitudinal dust axis;
- the roof drill bit further having a hard insert received within the slot, and the hard insert having a leading surface;
- and
- the leading surface of the hard insert being rotationally forward of the central longitudinal dust axis of the dust port for the entire axial length of the dust port wherein the leading surface of the hard insert being in direct operative communication with the dust port.
1 more element
A roof drill bit body comprising:
- an elongate body member having a forward end and a rearward end, the elongate body member containing a slot in the forward end thereof whereby the slot bisects the forward end of the elongate body member into opposite symmetric portions;
- the roof drill bit body further containing an interior bore therein wherein the interior bore having an inside transverse dimension;
- the roof drill bit body containing a pair of dust ports wherein each one of the dust ports corresponds with a corresponding symmetric portion;
- each of the symmetric portions having a twisted helical surface, and the twisted helical surface having an axial rearward termination at the dust port corresponding with the twisted helical surface;
- each one of the twisted helical portions having a minimum transverse dimension at the axial rearward termination of the twisted helical portion;
- and
- the sum of the minimum transverse dimensions of the pair of the twisted helical portions being less than or equal to the inside transverse dimension of the interior bore in the roof drill bit body.
4 more elements
A roof drill bit comprising:
- an elongate body member having a forward end and a rearward end, the elongate body member containing a slot in the forward end thereof whereby the slot bisects the forward end of the elongate body member into opposite symmetric portions;
- the roof drill bit body further containing an interior bore therein wherein the interior bore having an inside transverse dimension;
- the roof drill bit body containing a pair of dust ports wherein each one of the dust ports corresponds with a corresponding symmetric portion;
- each of the symmetric portions having a twisted helical surface, and the twisted helical surface having an axial rearward termination at the dust port corresponding with the twisted helical surface;
- each one of the twisted helical portions having a minimum transverse dimension at the axial rearward termination of the twisted helical portion;
- the sum of the minimum transverse dimensions of the pair of the twisted helical portions being equal to less than the inside transverse dimension of the interior bore in the roof drill bit body;
- the roof drill bit further having a hard insert received within the slot, and the hard insert having a leading surface;
- and
- the leading surface of the hard insert being rotationally forward of the central longitudinal dust axis of the dust port for the entire axial length of the dust port.
6 more elements
Dependencies are inferred from the claim text.