| 摘要 |
A torque nut for a mine roof or rock bolt intended for use with a multi-component, rapid curing resin that is mixed by rotation of the bolt through the torque nut includes a nut body 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 when the nut is threaded on the bolt to permit transmittal of a predetermined torque through the nut into the bolt to mix the resin in a bore hole associated with the bolt. 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. The interference between the nut threads and the bolt threads is not so great as to prevent advancement of the nut along the bolt after the resin has cured to permit tensioning of the bolt through continued advancement of the nut up to its final installed position.
|
