Communications: radio wave antennas – Antennas – With support for antenna – reflector or director
Reexamination Certificate
1999-10-07
2001-02-06
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
With support for antenna, reflector or director
C343S878000, C343S880000, C343S901000
Reexamination Certificate
active
06184843
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to antennas using extended and stowed positions.
More particularly, the present invention relates to apparatus for positioning an antenna from a stowed position to an extended position and for maintaining the antenna in either position.
BACKGROUND OF THE INVENTION
This invention applies to antennas using extended and stowed positions or other mechanisms using multiple detent positions. Existing technology incorporates separate bearings into the antenna which include anti-rotation and detent features. However, the addition of the separate bearings between an antenna stem and the antenna results in additional tolerance stackup and assembly difficulties. Because the bearings are separate parts, additional features are required in the antenna to contain the bearings. The tolerance stackups can permit malfunction of the anti-rotation features, poor sliding performance, and poor detenting performance. Further, the separate components and additional assembly steps add substantially to the cost. In addition, because of the separate bearing the antenna cannot physically accommodate a smaller antenna element because the bearing fits inside of the element and, therefore, the bearing size controls the element diameter.
Accordingly it is highly desirable to provide apparatus which overcomes these problems and which is inexpensive and easy to install and use.
REFERENCES:
patent: 4283836 (1981-08-01), Janisiewicz et al.
patent: 4739236 (1988-04-01), Burkenpas
patent: 5613929 (1997-03-01), Bayer
patent: 5795093 (1998-08-01), Seaton et al.
Henderson Gordon Craig
Isbell James Lee
Minks Dan Earl
Bogacz Frank J.
Motorola Inc.
Phan Tho
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