| 摘要 |
The present invention provides an apparatus ( 10 ) and method for transmitting torque to a downhole device. The apparatus ( 10 ) comprises a first part and a second part adapted for connection to the downhole device. The apparatus ( 10 ) also comprises an engagement means ( 100, 120 ). The first and second parts are connected together such that relative axial movement between the first and second parts is constrained on a helical path. The engagement means ( 100, 120 ) are arranged to rotationally connect the first and second parts to thereby transmit torque from the first part to the second part when a coupling point is reached on the helical path.
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