| 摘要 |
An internal, positive engagement lock locks a tool (18), such as a hydraulic drilling jar, in the fully open position when the tool (18) is racked back and when tripping in and out of the hole close to the surface. A lock mechanism (10) is spring biased into a locked position that provides a positive engagement between two axially translatable components, thus preventing any actuation of the tool (18). As the tool (18) is run in the hole, increasing hydrostatic pressure within the tool (18) will cause the locking mechanism (10) to shift to a disengaged position and the tool (18) will operate normally. The spring-biased locking mechanism (10) will return to the locked position as hydrostatic pressure decreases as the tool (18) is retrieved to the surface. <IMAGE>
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