Wedge barrel for a twin cable mine roof bolt
AssigneeDywidag-Systems International, U.S.A., Inc.
InventorsAlexander I. Wallstein, Richard Pope
Life of this patent
Estimating the term…
Abstract
A twin cable mine roof bolt includes a barrel having a first end, a generally dome-shaped second end, and an outer surface, a pair of angled and narrowing bores extending through the barrel, with each bore sized to receive a cable, a pair of wedges sized for placement in each of the bores to secure the cables, and a protrusion extending from the first end of the barrel and sized for insertion into a socket wrench.
Claims27
A twin cable mine roof bolt comprising:
- a barrel, the barrel having a first end, a generally dome-shaped second end, and an outer surface;
- a pair of bores extending through the barrel between the first end and the second end, each of the bores including a generally conical portion narrowing toward the second end, each of the bores sized to receive a cable;
- a pair of wedges sized for placement in the conical portion of each of the bores, each of the pair of wedges adapted to engage the cable in the corresponding bore with progressively greater force in response to movement of the wedges toward the second end;
- and
- a protrusion extending from the first end of the barrel, the protrusion sized for insertion into a socket wrench.
A twin cable mine roof bolt for use with a bearing plate and comprising:
- a barrel, the barrel having a first end, a second end sized and shaped to engage the bearing plate, and an outer surface;
- a pair of bores extending through the barrel between the first end and the second end, each of the bores including a generally conical portion narrowing toward the second end;
- each of the bores sized to receive a cable and pair of wedges;
- and
- a platform defined between the first end and the second end;
- a protrusion extending from the platform, the protrusion recessed radially from the outer surface of the barrel, the protrusion sized for insertion into a socket wrench.
A twin cable mine roof bolt comprising:
- a barrel, the barrel defining a longitudinal axis and having a first end, a generally dome-shaped second end, and an outer surface;
- a pair of bores extending through the barrel between the first end and the second end and angled in opposite directions relative to the longitudinal axis of the barrel, each of the bores including a generally conical portion narrowing toward the second end;
- a pair of cables, each of the cables disposed in a corresponding one of the bores;
- a pair of wedges sized for placement in the conical portion of each of the bores, each of the pair of wedges adapted to engage a corresponding one of the cables in a corresponding one of the bores with progressively greater force in response to movement of the wedges toward the second end;
- a platform;
- and
- a protrusion extending from the platform, the protrusion including a plurality of driving surfaces set back relative to the outer surface of the barrel, the protrusion further including a pair of recessed positioned to accommodate the pair of bores, the protrusion sized for insertion into a socket wrench.
A method of installing a mine roof bolt comprising the steps of:
- providing a barrel having a pair of tapered bores;
- providing a cable disposed through each of the bores;
- securing each of the cables in a corresponding one of the bores;
- inserting the cables in a prepared hole;
- applying a drive socket to a protrusion extending from the barrel;
- and
- rotating the barrel and the pair of cables about a longitudinal axis using the drive socket.
Dependencies are inferred from the claim text.