Abstract: There is provided an electric antenna apparatus which is mounted on a vehicle such as an automobile, and in which the rotation of a DC motor drives and rotates a pinion through a reducing mechanism, and a cable coupled to the base end portion of an antenna rod is coupled to this pinion so as to come into engagement therewith. The cable is driven in its longitudinal direction due to the pinion, rotated in response to the rotation of the motor, and the antenna rod coupled to this cable is driven, thereby allowing the antenna rod to be extended or retracted. In this case, a magnetic disk, formed with a plurality of magnetic poles in its outer peripheral portion, is mounted to a worm wheel constituting the reducing mechanism so that the magnetic disk is rotated coaxially with the worm wheel. Also, a reed switch is attached to a circuit board set adjacent to the motor, thereby allowing a pulse-like signal from the reed switch to be detected in response to the rotation of the magnetic disk.

Abstract: A driving apparatus which includes a driving and driven belt pulleys at least one of which is constructed to change the effective diameter thereof, in response to the rotational speed of a driving power source. An endless v-belt serves as the driving connection between the driving and driven pulleys. The belt pulley with a changeable effective diameter has a first fixed pulley plate, a second slidable pulley plate and at least one weight operated by the centrifugal force acting thereon. The weight serves to shift the second pulley plate relative to the first pulley plate thereby to change the effective diameter of an annular groove defined between the first and second pulley plates with the increase of the centrifugal force. Therefore, the speed ratio of a driven unit to the driving power source is varied in response to the speed of the driving power source.

Abstract: A mixed yarn having a uniform dyeability to an acid dye, which comprises at least two kinds of polyamide filaments differing in shrinkage, each consisting mainly of repeating units represented by the following general formula: ##SPC1##