| 摘要 |
A prevailing type torque nut, and method and apparatus for manufacturing such a nut. The nut is formed with two locally deformed locking portions which are formed in such a way that the remainder of the threads extending between the locking portions is substantially continuous, uninterrupted and undeformed. As a result, the nut offers greater control over the locking torque characteristics and permits a wider latitude of tolerances. In accordance with the method of forming the nut, the nut is locally deformed by applying pressure to its outer surface so that the threads will be displaced radially inwardly at localized portions. Means cooperate with the threads intermediate the locking portions to internally support the intermediate thread portions and thereby preclude any substantial deformation thereof during the forming operation. An apparatus for forming such lock nuts is disclosed which consists of an inner mandrel having a tapered outer section which corresponds in diameter to the crest diameter of the nut threads. Two reliefs are formed in the mandrel and a cooperating crimping tool is provided which engaged the outer surface of the nut in alignment with the recesses for deforming the nut material into the recesses of the mandrel.
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