Abstract: For carrying out a method to displace an object from a resting position to to a working position or vice verse, 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.

Abstract: The invention is a screw and nut assembly having a particular thread configuration. The externally threaded spindle has both a spiral threaded portion and a spiral non-threaded portion which separates the convolutions of the threaded portion. The threaded portion includes a plurality of individual threads, each individual thread extending only over a part of the periphery of the spindle body. The nut member also includes a spiral threaded portion and a spiral non threaded portion which nut portions match the respective portions of the spindle. Because of this arrangement, the nut may be rapidly moved along the spindle body when their respective non-threaded portion are engaged. Thereafter, the nut may be turned so as to engage its threaded portion with the threaded portion of the spindle.