Telescopic rod antenna and method for manufacturing the same

Details Telescopic rod antenna and method for manufacturing the same Telescopic rod antenna and method for manufacturing the same

1998-03-10

1999-10-19

Wong, Don

Communications: radio wave antennas

Antennas

Rod type

343740, H01Q 110

Patent

active

059696940

ABSTRACT:
A telescopic rod antenna according to the present invention includes an antenna element and a waterproof ring-shaped seal member which is inserted in a ring-shaped gap in a joint between two rods of the antenna element. The ring-shaped seal member is obtained by shaping a thermoplastic resin film strip, on which at least one projecting portion is formed in its longitudinal direction, like a ring and compressing and inserting a ring-shaped film into the ring-shaped gap. A plurality of ring-shaped contact portions are formed on both sides of the film strip in its longitudinal direction while the projecting portion of the film strip serves as a basic contact portion. The ring-shaped contact portions are adhered to the inner surface of the larger-diameter rod and the outer surface of the smaller-diameter rod at a predetermined pressure. The tip portion of the smallest-diameter rod is provided with a short cylinder member fitted to the outer periphery of the tip portion of the smallest-diameter rod, and a stopper member for sealing an open end of a hollow of the short cylinder member.

REFERENCES:
patent: 4331339 (1982-05-01), Reinsma
patent: 5072230 (1991-12-01), Taniyoshi et al
patent: 5079562 (1992-01-01), Yarsunas et al.
patent: 5189435 (1993-02-01), Yarsunas et al.

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