Friction fit drill bit assembly for a self-drilling rock bolt
AssigneeInnovative Mining Products (Pty) Ltd
InventorPaolo Ettore Pastorino
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Abstract
The invention provides an adaptor for connecting a drill bit to a hollow shank of a self-drilling rock bolt, the adaptor including a body which extends in an axial direction between a distal end and a proximal end, a tubular conduit which extends between the ends, an abutment surface formed in an outer surface of the body that divides the body into a proximal portion and a distal portion, wherein at least a part of the proximal portion includes a first taper which tapers towards the proximal end, wherein at least a part of the distal portion includes a second taper which tapers towards the distal end, and wherein the first taper and the second taper are adapted for friction fit in a bore of the shank and a recess in the drill bit respectively.
Claims2
An adaptor for connecting a drill bit to a hollow shank of a self-drilling rock bolt, the adaptor comprising:
- a body which extends in an axial direction between a distal end and a proximal end;
- a tubular conduit which extends between the distal and proximal ends;
- and
- an abutment surface formed in an outer surface of the body that divides the body into a proximal portion and a distal portion,
- wherein at least a part of the proximal portion includes a first taper with a first taper angle which tapers towards the proximal end,
- wherein at least a part of the distal portion includes a second taper with a second taper angle which tapers towards the distal end, and
- wherein the first taper angle is smaller than the second taper angle to provide friction fit of the first taper and the second taper with a bore of the shank and a recess in the drill bit respectively.
A friction fit drill bit kit comprising:
- a drill bit which has a drill bit body which extends in an axial direction between a drill face end and a trailing end, the drill bit body comprising a tapered recess in the trailing end and at least one tubule which opens the tapered recess to the drill face end;
- and
- an adaptor configured to connect the drill bit to a hollow shank of a self-drilling rock bolt, the adaptor comprising:
- a body which extends in the axial direction between a distal end and a proximal end;
- a tubular conduit which extends between the distal and proximal ends;
- and
- a surface formed in an outer surface of the body that divides the body into a proximal portion and a distal portion,
- wherein at least a part of the proximal portion includes a first taper with a first taper angle which tapers towards the proximal end,
- wherein at least a part of the distal portion includes a second taper with a second taper angle which tapers towards the distal end, and
- wherein first taper angle is smaller than the second taper angle to provide friction fit of the first taper and the second taper in a bore of the shank and the tapered recess of the drill bit respectively.
Dependencies are inferred from the claim text.