| 摘要 |
A jar comprises a housing including an anvil. In addition, the jar comprises a mandrel telescopically disposed within the housing and including a hammer. Further, the jar comprises an annular chamber radially positioned between the mandrel and the housing. Still further, the jar comprises an actuation assembly disposed in the annular chamber. The actuation assembly includes a first collet disposed about the mandrel, a first trigger sleeve disposed about the first collet and adapted to releasably engage the first collet, and a first biasing member adapted to exert an axial force on the mandrel. Moreover, the jar comprises a lock assembly disposed in the annular chamber. The lock assembly includes a second collet disposed about the mandrel, a second trigger sleeve disposed about the second collet and adapted to releasably engage the second collet, and a second biasing member adapted to exert an axial force on the mandrel.
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