Mine roof bearing plate

A bearing plate for supporting a portion of a mine roof or similar surface, said bearing plate comprising:

• roof-bearing means including a substantially planar roof-bearing surface for supporting said portion of said mine roof;
• bolt-head bearing means defining an aperture adapted to receive a roof bolt having a bolt head, said aperture being concentric about an axis that is perpendicular to said planar roof-bearing surface;
• a reinforcing wall including a first substantially frusto-conical portion concentric about said axis, said first frusto-conical portion having a base connected to and surrounded by said planar roof-bearing surface of said roof-bearing means and a distal end spaced therefrom, a second substantially frusto-conical portion concentric about said axis, said second frusto-conical portion having a base and a distal end spaced therefrom, and first wall means connecting the base of the second frusto-conical portion with the distal end of said first frusto-conical portion, the diameter of the base of said second frusto-conical portion being less than the diameter of the distal end of said first frusto-conical portion;
• and
• second wall means connecting the distal end of said second frusto-conical portion with said bolt-head bearing means for translating a bearing force applied to said bolt-head bearing means by said bolt head to said bearing surface for supporting said portion of said mine roof.

A bearing plate for supporting a portion of a mine roof or similar surface, said bearing plate comprising:

• a substantially planar roof-bearing portion including a roof-bearing surface and an outer surface;
• a substantially planar circumferential portion having a bolt-head bearing surface and an opposite surface, said bolt-head bearing surface terminating in a perimeter, said bolt-head surface being concentric about an axis that is perpendicular to said planar roof-bearing portion, said circumferential portion including a concentrically located aperture adapted to receive a roof bolt having a bolt head, said opposite surface facing said outer surface, said circumferential portion spaced from and substantially parallel to said roof-bearing portion;
• a perimeter wall extending from said perimeter of said bolt-head bearing surface completely around said perimeter to define a cylindrical portion having a distal end spaced from said bolt-head bearing surface, said perimeter wall being normal to said bolt-head bearing surface;
• means for connecting said cylindrical portion to said perimeter of said bolt-head bearing surface;
• and
• a reinforcing wall extending radially outward from the distal end of said cylindrical portion and toward the outer surface of said roof-bearing portion to merge with said roof-bearing portion, wherein a bearing force applied to said bolt-head bearing surface by said bolt head is translated to said roof-bearing surface to support said portion of said mine roof.

A bearing plate for supporting a portion of a mine roof or similar surface, said bearing plate comprising:

• a substantially planar roof-bearing portion including a roof-bearing surface and an outer surface;
• an embossed area extending outwardly from said outer surface, said embossed area defining,
• a substantially planar circumferential portion having a bolt-head bearing surface and an opposite surface, said bolt-head bearing surface terminating in a perimeter, said bolt-head surface being concentric about an axis that is perpendicular to said planar roof-bearing surface, said circumferential portion including an aperture adapted to receive a roof bolt having a bolt-head, said aperture being concentric about said axis, said opposite surface facing said outer surface, said circumferential portion spaced from and substantially parallel to said roof-bearing portion,
• a reinforcing wall extending outwardly from said outer surface, said reinforcing wall including a first substantially frusto-conical portion having a base which is conterminous with said outer surface and a distal end spaced therefrom, and a second substantially frusto-conical portion having a base which merges with the distal end of said first frusto-conical portion and a distal end spaced therefrom, the diameter of the base of said second frusto-conical portion being less than the diameter of the distal end of said first frusto-conical portion;
• and
• a wall extending from said bolt-head bearing surface completely around said perimeter of said circumferential portion to the distal end of said second frusto-conical portion, said wall being oriented normal to said bolt-head bearing surface, wherein a bearing force applied to said bolt-head bearing surface by said bolt head is translated to said roof-bearing surface to support said portion of said mine roof.