| 摘要 |
A torque nut (20) for a mine roof or rock bolt (12) intended for sse with a multi-component, rapid curing resin that is mixed by rotation of the bolt through the torque nut having a threaded bore including threads of uniform lead and threads of progressively decreasing lead whereby the threads of decreasing lead create an interference between the nut threads and the bolt threads to permit transmittal of a predetermined torque through the nut into the bolt to mix the resin in a bore hole. The threads of decreasing lead in the torque nut are created by a coining process that does not affect the geometry of the threads other than the thread leads, which are affected in a progressive manner as the distance from the coined end of the nut increases.
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