Drive control apparatus for an electrically-driven type extensib

Details Drive control apparatus for an electrically-driven type extensib Drive control apparatus for an electrically-driven type extensib

1992-08-06

1993-08-10

Hill, Rolf

Communications: radio wave antennas

Antennas

Rod type

343715, 318603, H01Q 110

Patent

active

052353443

ABSTRACT:
A drive control apparatus for an electrically-driven type extensible/retractable antenna comprises a control circuit connected to a power supply, a motor controllable by the control circuit to be rotated in a normal or a reverse direction, a multi-threaded type worm provided on an output shaft of the motor, a worm wheel engaging with the worm, a drive gear receiving a rotational force of the worm wheel to allow it to be rotatably driven, a drive rope having a rack in mesh with the drive gear and adapted to be moved in a longitudinal direction upon the rotation of the drive gear, an extensible/retractable antenna element driven by the drive rope to allow it to be extended or retracted, stopper means for mechanically stopping an extending or a retracting motion of the antenna element when the antenna element reaches an extension or a retraction limit, a shock absorber made up principally of an elastic member for alleviating an impact force by which the antenna element is stopped upon collision with the stopper means, the elastic member being placed partway on a movable system from the output shaft of the motor to impact portions colliding with the stopper means, and switching means provided in the control circuit and adapted to cut off the power supply to the motor when an elastic deformation of the shock absorber is stopped.

REFERENCES:
patent: 4514670 (1985-04-01), Fassel et al.
patent: 4591868 (1986-05-01), Cusey et al.
patent: 4749924 (1988-06-01), Watanabe et al.
patent: 4864322 (1989-09-01), Yamamoto et al.
patent: 4990836 (1991-02-01), Nakase et al.

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