Abstract: The invention concerns a mounting arrangement for an arc-quenching chute cover upon a base of a switching device. For that purpose it includes resilient clamping elements, such as a quick-release fastener which guides a coil spring and a rubber bushing. The anchoring of the quick-release fastener in the base is achieved by twisting a pin into a widened region. When excess pressures arise inside the arc-quenching chute cover, the rubber bushing is compressed and has a damping effect on the shaft portion of the quick-release fastener passing through it.

Abstract: A sound recording and reproducing apparatus utilizing replaceable magnetic tape cassettes. The sound recording and reproducing apparatus includes an arrangement for the detection of a specified position of the tape utilizing a light detection unit which is installed in the apparatus. The light detection unit consists of a light emitting device together with a light receiving device. The casing of the cassette includes a reflective portion thereon which is placed in reflective alignment between the light emitting device and the light receiving device. Light can only be transmitted between the light emitting device and the light receiving device once a specified position of the tape is achieved.

Abstract: In sound recording and reproducing apparatus of the magnetic tape type, two pivotal levers of similar form are provided, each with a wing and two guide flanges, arranged in the assembled condition with their guide flanges on a mounting pin and pivotally biased by a torsion spring so that the wings press the magnetic tape against the magnetic heads. Each pivotal lever has an abutment nose which is pressed by the torsion spring surrounding the mounting pin against an abutment surface on the other pivotal lever, such that the two levers, the torsion spring and the mounting pin constitute a group which is a closed system as regards forces and shape. The mounting pin has an intermediate portion of reduced diameter, and the openings in the guide flanges and the torsion spring bear against generally opposite sides of the mounting pin, thus preventing accidental dislodgement of the levers in the longitudinal direction of the mounting pin.