Communications: radio wave antennas – Antennas – With support for antenna – reflector or director
Reexamination Certificate
1999-06-15
2001-05-22
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
With support for antenna, reflector or director
C343S766000, C248S183300
Reexamination Certificate
active
06236376
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a suspension device for rotating appliances, such as antennas, of the type which for rotation is connectible with a frame-mounted shaft which extends through a power operated disk or a similar antenna mounting and which, beyond the antenna mounting, has a free end mounted in a stationary part, which is capable of limited motion generated by insufficient concentricity between the antenna mounting and the shaft, for which an angle-transducing device is arranged.
BACKGROUND ART
From frame-mounted rotatable antennas, signals are transmitted to a stationary installation for processing and evaluation. In, for instance, radar antennas, the rotational angular position of the antenna is relevant for the evaluation of the signals. The transmission occurs via a transmitter, a rotating member, which is theoretically coaxial with the axis of rotation of the antenna, to a stationary installation for processing the signals. Therefore, in such antennas there is at least one angle-transducing device connected to one of the rotary parts of the antenna.
The prior-art technique of suspending the rotating member is inaccurate owing to the fact that in actual practice it is very difficult to mount the shaft of the rotating member concentrically with the antenna shaft, so that the angle-transducing device provides correct information on the rotational angular position of the antenna. There will always be a certain eccentric and inclination error between the antenna shaft and the mounting of the shaft, which causes errors in the angle transducing.
If the stationary part is rigidly fixed to the frame, forces will arise, which are a great stress on the components included in the antenna suspension. This results in a short service life, short service intervals and great expenses for repair and spare parts.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the above deficiency in connection with angle transducing of the prior-art suspension devices for rotatable appliances and to achieve the extremely great accuracy in angle reproduction that is necessary for, for instance, modern radar systems, and to keep the expenses down for repair, maintenance and spare parts.
According to the invention, this object is achieved by a device according to the introductory part, which comprises a connector which is arranged adjacent to or round the rotating member and directs components of force on the stationary part, which have arisen owing to insufficient concentricity, to merely displacement in the X-Y direction in a plane perpendicular to the shaft by the connector being displaceably fixed in the X direction to the stationary part and displaceably fixed in the Y direction of the frame, or by the connector being displaceably fixed in the X direction to the antenna shaft and displaceably fixed in the Y direction to the antenna mounting.
Further developments of the invention are evident from the features that are stated in the dependent claims.
REFERENCES:
patent: 4988963 (1991-01-01), Shirosaka et al.
patent: 5140289 (1992-08-01), Andrieu et al.
patent: 5212493 (1993-05-01), Cluniat et al.
patent: 6023247 (2000-02-01), Rodeffer
patent: 771728 (1934-10-01), None
patent: 07326452 (1995-12-01), None
patent: WO94/26001 (1994-11-01), None
patent: WO95/18471 (1995-07-01), None
Burns Doane , Swecker, Mathis LLP
Ho Tan
Sivers Lab AB
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