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US 8,007,206 B1Granted
Low profile cable bolt headers
AssigneeExcel Mining Systems LLC
InventorAnthony John Spencer Spearing
Life of this patent
Estimating the term…
Abstract
Improved roof cable bolts with reduced protrusion from a mine roof. Particularly, a roof cable bolt head can preferably be dimensioned such that most of its length fits inside a drilled hole in the mine roof.
Claims4
A low profile roof bolt head comprising:
- a first section adapted for insertion into a roof hole, said first section having a first end surface of the roof bolt head;
- a second section adapted for accommodating a tightening tool, said second section having a second end surface of the roof bolt head;
- and
- a first throughhole portion extending through said first section and forming an opening in said first end surface for accommodating a first bolt portion;
- a second throughhole portion extending through said second section and forming an opening in said second end surface for accommodating a second bolt portion;
- said first section having an end portion opposite said first end surface, said first section tapering in outer cross-sectional dimension from said end portion to said first end surface;
- wherein said second section has a roof plate contacting portion disposed adjacent said end portion of said first section for contacting a roof plate upon initial insertion of said first section into the roof hole and having a diameter larger than the outer cross-sectional dimension of said first section;
- wherein said second section has a height dimension, in parallel to a central longitudinal axis of said roof bolt head, that is less than or equal to 0.75 inch;
- wherein said first and second sections have a combined height dimension, in parallel to the central longitudinal axis of said roof bolt head, that is less than or equal to 1.75 inches;
- wherein said first throughhole portion and said second throughhole portion form a common throughhole extending through said first and second sections;
- and
- wherein said throughhole has a constant slope of 3° from vertical extending from said first end surface to said second end surface.
9 more elements
A low profile roof cable bolt comprising:
- a cable bolt body;
- a cable bolt head disposed at an end of said cable bolt body;
- said cable bolt head comprising:
- a first section adapted for insertion into a roof hole, said first section having a first end surface of the roof bolt head;
- a second section adapted for accommodating a tightening tool, said second section having a second end surface of the roof bolt head;
- and
- a first throughhole portion extending through said first section and forming an opening in said first end surface for accommodating a first bolt portion;
- a second throughhole portion extending through said second section and forming an opening in said second end surface for accommodating a second bolt portion;
- said first section having an end portion opposite said first end surface, said first section tapering in outer cross-sectional dimension from said end portion to said first end surface;
- a roof plate contacting portion disposed adjacent said end portion of said first section for contacting the roof plate upon initial insertion of said first section into a roof hole and having a diameter larger than the outer cross-sectional dimension of said first section;
- wherein said second section has a height dimension, in parallel to a central longitudinal axis of said roof bolt head, that is less than or equal to 0.75 inch;
- wherein said first and second sections have a combined height dimension, in parallel to the central longitudinal axis of said roof bolt head, that is less than or equal to 1.75 inches;
- wherein said first throughhole portion and said second throughhole portion form a common throughhole extending through said first and second sections;
- and
- wherein said throughhole has a constant slope of 3° from vertical extending from said first end surface to said second end surface.
12 more elements
A method of installing a low profile roof cable bolt, said method comprising the steps of:
- providing a low profile roof cable bolt comprising:
- a cable bolt body;
- and
- a cable bolt head disposed at an end of the cable bolt body, the cable bolt head comprising a first section adapted for insertion into a roof hole, said first section having a first end surface of the roof bolt head, a second section adapted for accommodating a tightening tool, said second section having a second end surface of the roof bolt head, and a first throughhole portion extending through said first section and forming an opening in said first end surface which accommodates the cable bolt body, a second throughhole portion extending through said second section and forming an opening in said second end surface for accommodating a bolt portion, said first section having an end portion opposite said first end surface, said first section tapering in outer cross-sectional dimension from said end portion to said first end surface, a roof plate contacting portion disposed adjacent said end portion of said first section for contacting a roof plate upon initial insertion of said first section into the roof hole and having a diameter larger than the outer cross-sectional dimension of said first section, wherein said second section has a height dimension, in parallel to the central longitudinal axis of said roof bolt head, that is less than or equal to 0.75 inch, wherein said first and second sections have a combined height dimension, in parallel to a central longitudinal axis of said roof bolt head, that is less than or equal to 1.75 inches, wherein said first throughhole portion and said second throughhole portion form a common throughhole extending through said first and second sections;
- and wherein said throughhole has a constant slope of 3° from vertical extending from said first end surface to said second end surface;
- disposing the cable bolt body and the first section of the cable bolt head into the roof hole;
- and
- rotating the second section of the cable bolt head with the tightening tool thereby rotating the cable bolt body within the roof hole.
5 more elements
A low profile roof cable bolt comprising:
- a cable bolt body;
- a cable bolt head disposed at an end of said cable bolt body;
- said cable bolt head comprising:
- a first section adapted for insertion into a roof hole, said first section having a first end surface of the roof bolt head;
- a second section, said second section having a second end surface of the roof bolt head;
- and
- a first throughhole portion extending through said first section and forming an opening in said first end surface for accommodating a first bolt portion;
- a second throughhole portion extending through said second section and forming an opening in said second end surface for accommodating a second bolt portion;
- said first section having an end portion opposite said first end surface, said first section tapering in outer cross-sectional dimension from said end portion to said first end surface;
- wherein said second section has a roof plate contacting portion disposed adjacent said end portion of said first section for contacting a roof plate upon initial insertion of said first section into the roof hole and having a diameter larger than the outer cross-sectional dimension of said first section;
- wherein said second section has a height dimension, in parallel to a central longitudinal axis of said roof bolt head, that is less than or equal to 0.75 inch;
- and
- wherein a portion of said second section has a diameter dimension, perpendicular to and centered on the central longitudinal axis of said roof bolt head, that is greater than or equal to 1.75 inches.
10 more elements
Dependencies are inferred from the claim text.