Roof bolt anchor with camming element

A mining roof bolt system comprising:

• a bolt comprising external threads;
• a camming element comprising:
• opposing ends and a midsection between said ends;
• said opposing ends being a proximal end and a distal end;
• the outer diameter of said midsection being greater than the outer diameters of said
• opposing ends, the camming element generally tapering from said midsection toward said ends and having at least one port on the exterior surface of said midsection;
• said camming element further comprising an axial bore and threads disposed therein;
• at least one stop depending from said camming element near said distal end;
• a deformable sleeve receiving and engaging said distal end of said camming element, said
• sleeve comprising a plurality of leaves parallel to the axis of said sleeve,
• said sleeve having an inner circumference and an outer circumference;
• wherein said at least one stop maintains said camming element and said sleeve in engagement.

A bolt anchor comprising:

• a camming element comprising:
• opposing ends and a midsection between said ends;
• said opposing ends being a proximal end and a distal end;
• the outer diameter of said midsection being greater than the outer diameters of said
• opposing ends, the camming element generally tapering from said midsection toward said ends and having at least one port on the exterior surface of said midsection;
• said camming element further comprising an axial bore and threads disposed therein;
• at least one stop depending from said camming element near said distal end;
• a plurality of parallel longitudinal leaves defining a void about an axis, each said
• leaf being attached to any adjacent leaf on at least one end, said leaves being deformable out from said axis, and said plurality of leaves receiving in one end of said void said distal end of said camming element;
• wherein said at least one stop maintains said distal end of said camming element in said void.

A bolt anchor comprising:

• a camming element comprising:
• opposing ends and a midsection between said ends;
• said opposing ends being a proximal end and a distal end;
• the outer diameter of said midsection being greater than the outer diameters of said
• opposing ends, the camming element generally tapering from said midsection toward said ends and having at least one port on the exterior surface of said midsection;
• said camming element further comprising an axial bore and threads disposed therein;
• at least one stop depending from said camming element near said distal end;
• a plurality of parallel longitudinal leaves defining a void about an axis, said
• leaves being maintained around said void about said axis by a collar, said leaves being deformable out from said axis, and said plurality of leaves receiving in one end of said void said distal end of said camming element;
• wherein said at least one stop maintains distal end of said camming element in said void.

A camming element for a mine roof bolt anchor employing a camming element and expansion sleeve, said camming element comprising:

• opposing ends and a midsection between said ends;
• said opposing ends being a proximal end and a distal end;
• the outer diameter of said midsection being greater than the outer diameters of said opposing ends, the camming element generally tapering from said midsection toward said ends and having at least one port on the exterior surface of said midsection;
• said camming element further comprising an axial bore and threads disposed therein and sized to fit a respective mine roof bolt.