Patent ID: 6736225
Filing Date: 2004-05-18
Classification: E21B,E21D

Abstract:
A guide for converting a mine roof bolter having a pair of guide members mounted for shifting toward and away from each other to receive and guide a drill rod or bolt of a selected diameter into a mine roof coring apparatus suitable for receiving and guiding a coring rod having a coring diameter greater than said selected diameter, said guide comprisinga pair of jaws, each jaw having an adapter end and a pivot end, with the pivot end of each jaw being pivotally coupled to the pivot end of the other jaw, means coupled to the jaws operable to yieldably bias the jaws to an open position with respect to each other, the adapter end of each jaw includes a jaw cavity that faces the jaw cavity included in the adapter end of the other jaw with each jaw cavity having a cross section that forms an arc of a circle with a central axis, wherein when the jaws are closed to a maximal extent, the jaw cavities form between them at least a major portion of a cylindrical coring cavity in which the central axes of the jaw cavities are disposed substantially on a common cylinder axis, the coring cavity having a cavity cylinder diameter substantially equal to said coring diameter, the pair of jaws being pivotable to an open position in which a cylindrical coring rod may be disposed between the jaws at their adapter ends, the jaws being pivotable to a closed position such that a cylindrical coring rod placed within the coring cavity is enclosed or grasped, and each jaw includes means for holding the guide within the mine roof bolter such that when the coring rod is positioned between the jaws and the jaws are closed such that they enclose or grasp the rod, the roof bolter may engage the coring rod causing it to penetrate the mine roof and obtain a core sample, thereby converting the mine roof bolter into a mine roof coring apparatus.