Abstract: For automatically returning a pickup arm to a predetermined starting position on the perimeter of a record disc on a motor-driven turntable upon completion of playback, a drive gear is mounted on a turntable shaft for simultaneous rotation with the turntable. A driven gear, integrally formed with a cam, is mounted on a pivotal arm for movement into and out of engagement with the drive gear. When the pickup arm travels to a terminal position on the record discs, during playback, the driven gear is thereby urged into engagement with the drive gear and is, thus, set in rotation with the cam. The rotating cam causes the pickup arm to be lifted off the record disc and, then, to be spring returned from the terminal to the starting position. The record disc used herein is of the type having a plurality of grooves formed therein in the shape of nested spirals, for successive or random playback.

Abstract: A simplified sound-reproducing device including a constant-torque spiral spring for driving a turntable on which a phonograph record is irreplaceably mounted. The spiral spring is unwound as a manual pull is exerted on a string extending out of the device, and upon release of the string, is rewound to its initial configuration, thereby causing the turntable to rotate in a predetermined direction. A reproducing stylus on a pivotal pickup arm rides in the groove on the record, and the vibrations set up in the stylus and pickup arm during record rotation are directly transmitted to a diaphragm to cause the same to emanate audible sound. Measures are taken against diaphragm deformation due to heat or shock which may be caused through the pickup arm.

Abstract: A phonograph wherein the vibrations set up by a record groove in a reproducing stylus on a tone arm are transmitted, without conversion into electric signals, to a diaphragm overlying the tone arm. Arranged between the tone arm and diaphragm is an intermediate vibrator which has a vibrator rod extending upwardly therefrom. The diaphragm is conical in shape, is secured to the phonograph casing at the periphery of its base, and has an aperture at its vertex to receive the vibrator rod with clearance. The intermediate vibrator is spring biased into contact with the tone arm, and the vibrator rod also spring biased into contact with the edge of the diaphragm bounding the aperture. This aperture can be reinforced with a hollow member which will receive the vibrator rod with clearance.