Rotatable cutting bit assembly
AssigneeKennametal Inc.
InventorDaniel C. Sheirer
Life of this patent
Estimating the term…
Abstract
A roof drill bit assembly comprising a roof drill bit and a chuck. The roof bit contains a cavity which opens at the rearward end thereof. Upon assembling the bit and the chuck, the cavity receives the axially forward end of the chuck. A sealing member is between the roof drill bit and the chuck so as to provide a fluid-tight connection between the chuck and the roof bit.
Claims26
A rotatable cutting bit assembly comprising:
- a cutting bit having an axially forward end and an axially rearward end, at least one cutting insert at the axially forward end of the cutting bit;
- the cutting bit containing a cavity therein;
- the cavity having an opening at the rearward end of the cutting bit, a cavity wall defining the cavity;
- the cutting bit further containing at least one passage at the axially forward end thereof, the passage communicating with the cavity;
- a chuck having an axially forward end and an axially rearward end, and
- upon assembling the bit and the chuck, the axially forward end of the chuck being received within the cavity of the bit, a sealing member being between the chuck and the cavity wall.
A chuck for assembly to a drill bit having a rearwardly opening cavity defined by a cavity wall, the chuck comprising:
- an axially forward end and an axially rearward end, the chuck having a central longitudinal bore therethrough, the chuck carrying a seal adjacent the axially forward end thereof;
- and
- upon assembling the bit and the chuck, the axially forward end of the chuck being received within the rearwardly opening cavity of the bit whereby the seal providing a fluid-tight seal between the cavity wall and the chuck.
A drilling assembly for connection to a rotational driver and a source of pressurized fluid, the assembly comprising:
- a drill bit having a cutting element at the forward end thereof and containing a cavity opening at the rearward end thereof, the drill bit further containing a passage at the forward end thereof, the passage being in fluid communication with the cavity;
- a chuck having opposite forward and rearward ends, the chuck having a central longitudinal bore in fluid communication with the cavity, the chuck carrying a forward seal at the forward end thereof, the forward end of the chuck being received within the cavity of the drill bit, a forward sealing member being between the chuck and the drill bit so that the forward seal providing a fluid-tight seal between the drill bit and the chuck, the chuck having a mediate external abutment limiting the distance the chuck can be inserted into the cavity;
- and
- a drill rod having opposite forward and rearward ends, the rearward end of the drill rod being connected to the rotational driver, the drill rod containing a central longitudinal bore with an opening at the forward end thereof, the drill rod bore being in fluid communication with the source of pressurized fluid, the drill rod bore being in fluid communication with the bore of the chuck, the opening in the drill rod bore receiving the rearward end of the chuck, a rearward sealing member being between the drill rod and the chuck so that the rear sealing member providing a fluid-tight seal between the chuck and the drill rod, and the abutment limiting the distance the chuck can be inserted into the drill rod bore.
Dependencies are inferred from the claim text.