| 摘要 |
For moving an element relative to an object a plurality of screw members having polygonal heads are screwed in threaded openings on the element and arranged around an axis so as to be circumferentially spaced from one another, an action drive and a reaction drive arranged coaxially to the axis and with one another and turnable in opposite directions apply opposite turning forces to the screw members on an outer circumference and on an inner circumference correspondingly so as to turn the screw members in one and the same direction to thereby move the element in an axial direction, and a plurality of transmitting members engage by first engaging formations both with the action drive and the reaction drive turnable in the opposite directions so as to be turned in one and the same direction and engage by second engaging formations with the polygonal heads of the screw members for transmitting the turning of the transmitting members in one and the same direction into turning of the screw members in one and the same direction.
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