Communications: radio wave antennas – Antennas – Rod type
Patent
1991-07-11
1992-08-25
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Rod type
343715, H01Q 110
Patent
active
051422956
ABSTRACT:
A compact direct drive system for an extensible and retractable antenna assembly uses a one-piece antenna and no threads or gears. The one-piece antenna is supported so as to slide axially up and down, but is restrained against turning. It runs through the hollow drive shaft of a coaxially supported electric motor. Traction rollers supported on skewed shafts fixed to the end of the drive shaft drive the antenna up and down.
REFERENCES:
patent: 2838953 (1958-06-01), Cone
patent: 2925743 (1960-02-01), Wise
patent: 3017780 (1962-01-01), Keinhofer
patent: 4153825 (1979-05-01), Flora
patent: 4789867 (1988-12-01), Lee
Brochure from Zero-Max Industries published in 1982.
General Motors Corporation
Griffin Patrick M.
Le Hoang-anh
Wimer Michael C.
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