Leica Camera Ag

Peter Schmidt

Gerhard Kranz

Rolf Crema

Screw mechanism having a spindle (,) which is secured in the axial direction and has a spindle axis (,&prime;), and a spindle nut (,) which is connected to a slide (,) which can be driven and is guided in the axial direction, a joint being provided between the spindle nut (,) and the slide (,) in order to compensate for relative transverse movements and tilting between the spindle nut (,) and slide (,), said joint being formed symmetrically to the spindle axis (,&prime;) and having two joint axes which are perpendicular to each other, intersect on the spindle axis (,&prime;) and are assigned at one end to the transverse movement of a bearing plate (,), which is connected to the spindle nut (,), and at the other end to the transverse movement of a bearing plate (,), which is connected to the slide (,), and said joint containing an intermediate plate (,) via which the bearing plates (,) are connected pivotably to each other in order to compensate for any tilting of their joint axes. The joint axes are each formed by two balls (,&prime;) which are arranged aligned with one another on opposite sides of the spindle axis (,&prime;), are mounted in mutually opposite prism grooves (,&prime;) in the bearing plates (,) and the intermediate plate (,), and bear against one another under spring pressure (,&prime;).

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Huttenberg, Germany

Peter Schmidt