Communications: radio wave antennas – Antennas – Rod type
Patent
1981-04-09
1982-10-05
Moore, David K.
Communications: radio wave antennas
Antennas
Rod type
343901, H01Q 110
Patent
active
043530753
ABSTRACT:
A telescoping, multi-tube, vehicle radio antenna adapted for power extension and retraction includes an outer metallic tube having inward bent upper end defining an inner annular bearing surface and an inner metallic cylindrical member in telescoping relationship within the outer tube, the cylindrical member having an expanded diameter rigid lower end which defines an outer annular bearing surface and further being slidably supported in the first tube by the axially separated bearing surfaces. The cylindrical member further has a circumferential shoulder spaced upwardly from its lower end and a circumferential sealing element carried on the upper side of the shoulder for compression between the shoulder and the inward bent upper end of the outer tube when the antenna is extended to prevent the entry of water into the antenna interior. The sealing element thus separates from the outer tube and contributes no sliding friction during the antenna extension and retraction.
REFERENCES:
patent: 2172117 (1939-09-01), Beaufort et al.
patent: 2173095 (1939-09-01), Byrne
patent: 2593432 (1952-04-01), Freas
patent: 3253799 (1966-05-01), Till
patent: 3929357 (1975-12-01), De Vincent et al.
patent: 4062156 (1977-12-01), Roth
General Motors Corporation
Moore David K.
Sigler Robert M.
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