| 摘要 |
A jar provided with an adjustable triggering load has a housing defining an anvil surface and a mandrel, movable relative to the housing under an applied load, defining a hammer surface to impact the anvil surface. A trigger mechanism for releasing the mandrel to cause the hammer surface to impact the anvil surface includes a trigger sleeve axially positioned within the housing and a collet that engages the mandrel during application of a load to the mandrel. The collet releases the mandrel to cause the hammer surface to impact the anvil surface upon being moved into registration with the trigger sleeve against the resistance of the spring disposed within the housing. The triggering load is adjusted by an adjustment mechanism carried by the housing and coupled to the trigger sleeve to selectively position the trigger sleeve within the housing in establishment of a required applied load in order for the collet to be moved against the spring resistance and into registration with the trigger sleeve to thereby release the mandrel and cause the hammer surface to impact the anvil surface.
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