Importance

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Abstract

A device for automatically expanding and contracting an antenna having a rotary member for moving a flexible rodlike member that is coupled to the antenna for expanding and contracting the antenna. A worm is driven by a motor to rotate about a motor axis and an intermediate gear unit having a worm wheel is formed unitarily with a small diameter gear, the worm wheel being engaged with the worm and the small diameter gear being engaged with the rotary member for rotatably driving the rotary member. A gear unit support frame is provided for supporting the intermediate gear unit and a support shaft is fixed to a casing member and coupled to the intermediate gear unit, the intermediate gear unit and the gear unit support frame being axially movable along the support shaft in a direction substantially perpendicular to the motor axis. A limit switch means is provided for interrupting a power-feed circuit that supplies power to drive the motor in either a forward or reverse direction, and a switch operation means operates the limit switch means responsive to a movement of the gear unit support frame along the support shaft.

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First Claim