| 摘要 |
This invention relates to an apparatus and method for actuating arms, and in particular to an apparatus and method for the controlled actuation of a plurality of arms as may be used on a borehole data-logging tool such as a measuring sonde, and be used to deploy measuring instruments against a borehole wall. According to the invention, there is provided an apparatus for actuating arms comprising: a mandrel, at least one arm carried by the mandrel, the or each arm being mounted to the mandrel to move between an expanded position in which a part of the arm projects from the mandrel, and a retracted position, resilient biassing means associated with the or each arm for biassing the arm towards its expanded position, restraining means associated with the or each arm for restraining the arm against movement towards its expanded position, and drive means acting upon the resilient biassing means for adjusting the resilient biassing force acting upon the arm(s). There is also disclosed a method of actuating the arms of a data-logging tool.
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