Abstract: The electromagnetic disk-free clutch includes a cylindrical rotor supported on one rotary part and defining at one end face a frictional disk and at the other end face an annular groove which accommodates a tubular stator with an electromagnetic coil. The frictional ring of the rotor faces a corresponding frictional ring of a spring-biased armature which is supported for joint rotation and for an axial displacement on the other rotary part. The stator part adjoining the open end of the annular gap is radially extended to form a covering flange having a cross section substantially equal to the cross section of the axially directed parts of the stator and the rotor. The face of the rotor forming the frictional ring is provided with uniformly distributed openings and the axial dimension of the annular groove in the rotor exceeds that of the stator.

Abstract: A motion picture sound camera wherein a chamber in the camera housing can receive relatively small containers for regular motion picture film or relatively large containers for sound film. When the chamber receives a large container, the latter deforms a leaf spring which is thereby disengaged from a lever serving to move a component of the sound recording mechanism into engagement with an accessible portion of sound film in the inserted container. The lever can be moved in the opposite direction by a knob which is accessible from without the housing and is turnable by hand between a first and a second position. When moved from the first to the second position, the knob moves the lever and the component to a retracted position while simultaneously stressing a resilient ejector for containers in the chamber, unlocking the door for the chamber and resetting a film frame counter to starting position.

Abstract: A motion picture camera for use with regular motion picture film or with motion picture film having a sound track and being stored in containers larger than those for the storage of regular film so that, when the chamber in the body of the camera received a small container, such small container leaves unoccupied a portion of the chamber which is occupied when the chamber receives a large container. A properly inserted large container deforms a leaf spring which extends into the aforementioned portion of the chamber whereby the thus deformed leaf spring enables a first lever to permit the pivoting of a second lever under the action of a torsion spring. The second lever moves a roller into engagement with film in a properly inserted large container opposite a rotary element which is adjacent to a sound head of the sound recording mechanism in the camera body.