Abstract: A change-over switch for the switching of two electric circuits is disclosed, including a housing, a tappet, two contacts of a first electric circuit, two contacts of a second electric circuit, and a switching contact which comprises in an initial state a first shape in which said first electric circuit is closed and said second electric circuit is opened, and which by actuating said tappet may be transferred into a second shape in which said first electric circuit is opened and said second electric circuit is closed.

Abstract: A change-over switch for the switching of two electric circuits is disclosed, including a housing, a tappet, two contacts of a first electric circuit, two contacts of a second electric circuit, and a switching contact which comprises in an initial state a first shape in which said first electric circuit is closed and said second electric circuit is opened, and which by actuating said tappet may be transferred into a second shape in which said first electric circuit is opened and said second electric circuit is closed.

Abstract: A winding apparatus for winding webs of paper, textile fabric, synthetic plastic material or other similar webs into tight rolls comprising a winding chamber having an inlet opening at the top and a pair of drive rollers for frictionally driving a roll of material arranged at the bottom, substantially diametrically opposite the inlet opening. One side of the winding chamber is defined by concave surfaces of a plurality of parallel wall elements, and the other side of the winding chamber is defined by a pivotally mounted shell body. In preferred embodiments, alternate devices for fastening a wound roll with an adhesive strip are disclosed. The winding apparatus of the invention can be manufactured at reasonable cost, does not require excessive space, and functions with a high degree of reliability.

Abstract: In a motor-driven cutter for the cutting open of plaster casts with a motor housing, a fixed center blade and two oscillatingly motor-driven blades disposed either side of the fixed blade and both interacting with said fixed blade and moving the cutter forward along the cut, in order to prevent unitentional contacting of the blades, it is proposed that a cover hood be displaceably mounted on the motor housing and be displaced by a flexible force storage means into a position covering the three blades whereby the cover hood exhibits glide-on surfaces which, as the cutter is pushed forward, glide on the plaster, thereby displacing the cover hood against the action of the flexible force storage means into a position exposing the blades.

Abstract: For the purpose of fastening instruments in an opening in a front panel or switchboard, connectors are provided which have tongue parts which are inserted from the rear into corresponding grooves along the side edges of the casing of each instrument. A cover plate projecting laterally beyond the casing abuts from the outside against the edge of the opening and the connectors press from the interior against the front panel or switchboard and pull the casing backwardly. The locking between the tongue parts and the grooves is effected by anchoring parts, preferably rows of teeth which are adapted to snap resiliently into one another and which act in the longitudinal direction.