| 摘要 |
For carrying out a method to displace an object from a resting position to a working position or vice versa, a device (1) is arranged comprising a screw (3) with two threads (7, 9) with different pitches and a body (2, 4) with internal threads matching the threads of screw (3). The body is shaped in two parts (2) and (4), which are arranged to be able to be displaced relative to one another in the axial direction of the screw (3), whereby a changing from one thread to another thread can be done by changing the distance between said parts (2, 4) of the body. The screw (3) is arranged to a first object and the body (2, 4) to a second object. In utilization of the method the object can be rapidly displaced to the resting position or working position by the fact that the screw and body are in engagement with one another in the one thread or a coarse thread and when necessary the screw and body are brought to change to an engagement with one another in the other thread or a fine thread, for example by an increased voltage. |
