Communications: radio wave antennas – Antennas – Rod type
Patent
1988-06-22
1989-10-17
Hille, Rolf
Communications: radio wave antennas
Antennas
Rod type
343715, 343900, H01Q 110
Patent
active
048750530
ABSTRACT:
A drive control device for an electrically-driven extending and retracting antenna such as an antenna on an automobile including a motor-driven rotary plate which makes approximately one revolution during the time for complete extension or retraction and has attached, on one side, a disk-shaped conducting part with a small cut-out. Of the three contacts, the first is ordinarily in contact with the disk-shaped conducting part, maintaining a state of electrical continuity, the second contact contacts the small cut-out when extension of the antenna is completed; and the third contact contacts the small cut-out when retraction of the antenna is completed. As a result, electrical continuity is maintained during extension or retraction of the antenna, but not when extension or retraction has been completed. The first and second contacts thus constitute a limit switch for antenna extension; and the first and third contacts constitute a limit switch for antenna retraction. As a result, the extension and retraction operating wire never sustains any unreasonable tensile or compressive forces as would be the case with a step-type drive control, where the drive motor operates for longer periods than required.
REFERENCES:
patent: 4330782 (1982-05-01), Hashimoto et al.
patent: 4506266 (1985-03-01), Mizuno et al.
patent: 4649398 (1987-03-01), Yamamoto et al.
Harada Kogyo Kabushiki Kaisha
Hille Rolf
Johnson Doris J.
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