Static structures (e.g. – buildings) – Including component designed to receive a disparate article... – On shaft or tower
Reexamination Certificate
1996-06-13
2001-01-16
Callo, Laura A. (Department: 3635)
Static structures (e.g., buildings)
Including component designed to receive a disparate article...
On shaft or tower
C052S749100, C052S749100, C052S749100, C052S749100, C343S890000
Reexamination Certificate
active
06173537
ABSTRACT:
This invention relates to a tower intended to serve as an antenna carrier.
Traditionally masts employed as antenna carriers within radio-, data- and telecommunication have been of the lattice type which in addition to being well tested has the advantage that its surface exposed to wind is comparatively small and that it may therefore be built having a considerable height. The traditional lattice type masts do however suffer from several disadvantages. Among these may be mentioned that the lattice type masts are relatively exposed when it comes to danger of sabotage, since the cables run comparatively unprotected in the masts and especially at their passage to the required electronic equipment, such as radio equipment, for which a separate building or container must be provided, which is either isolated at the side of the mast or on which the mast is erected. Furthermore, expensive and energy consuming air-conditioning plants are almost always required in order to maintain the electronic equipment at an acceptable temperature, that is usually at a maximum of 40-50° C.; the ground space requirement is relatively great on account of the stay wires; in some countries it is difficult to aquire a building permit; this type of mast is disturbing from an aesthetical point of view.
Certain efforts have been made to replace the traditional lattice type mast by concrete towers, like before in combination with a separate container accomodating the electronic equipment. However, apart from the fact that these solutions do not eliminate the problems of the danger of sabotage and of the demand for air-conditioning plants, they give rise to considerably increased costs in addition to the fact that the very high weight of the tower in itself and the large surface exposed to wind give rise to further problems.
Swedish printed and published specification 333 959 discloses a so called turnstile antenna mounted on a concrete base. Although this prior art antenna is referred to as a tubular mast antenna it does in practice have a central, supporting stem serving as an antenna carrier and being surrounded by tube sections consisting of an insulating material, such as glass fibre material, serving as a weather protection. Thus, the tube sections do each only carry their own weight, whereas the central stem in the shape of tubes or rods constitute the actual supporting mast. The structure is complex and comparatively expensive and in addition thereto this antenna, which is intended for television broadcast, cannot replace the lattice type mast desribed in the introduction.
The basic object of the invention is therefore to provide a tower of the kind indicated in the introduction, which generally may replace the traditional lattice type masts and which eliminates the above discussed problems associated therewith.
According to the invention this object is achieved by means of a tower having the features indicated in the claims.
Preferred embodiments of the invention are indicated in the dependent claims.
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Davidsson Mikael
Miettinen Heikki
Callo Laura A.
Henderson & Sturm LLP
Mafi AB
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