| 摘要 |
A shock sub for absorbing torsional impact loads includes a tubular housing having an interior surface and an inner mandrel telescopically received within the tubular housing. The inner mandrel has an outer surface. A spiral engagement is provided between the inner surface of the housing and the outer surface of the mandrel allowing unfetterd relative rotational movement of the housing and the mandrel along a spiral guide path defined by the spiral engagement. Springs are provided for dampening relative rotation of the housing and the mandrel, such that torsional impact loads result in relative rotational movement of the housing and the mandrel along the spiral guide path, with the relative rotational movement being resisted and absorbed by the springs.
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