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(11)Patent Number: KE 153
(45) Date of grant:
(51) Int.C1.4:C 11D 3/00
(21) Application Number: 1999/000286
(22) Filing Date: 02/08/1999
(73) Owner: PAUL MBURU WAINAINA of, P 0 BOX 30304 NAIROBI, Kenya
(57) Abstract:
The invention relates to a micro switchoperation, normally opened contact closes and supplies to the tuner. The neutral and earth wires are directly connected to plug.The tuner has an automatic reversing mechanism designed by taking advantage of alternating current flow phenomenon ana few motor features i.e. motor winding is designed to provide a bi-directional rotation. Also, has a projection on its casing, which has assisted in providing affirm motorstopper.Another" L" shaped projection has been designed and secured on the shaft to lock at the stopper. This provides instant reversing of motor whenever the rotating projection on shaft locks at the stopper due to the above principle. The aerial rotating angle is 355 degrees and the motor speed is 2.5 revolt
The present invention relates to an aerial rotator consisting its controlling means and more particularly for applications such as rotating domestic television aerials. The device enables the user to electrically turn an aerial which is mounted on its rotatable member to track wave directions easily. It's particularly ideal where signals have designated directions due to differently located transmitting stations.
Summary of the invention
Among the several objects of this invention may be noted as the provision of an aerial rotator that is able to rotate an aerial to a desired heading conveniently; provision of such aerial rotator that is simply constructed with minimal controlling means; provision of an aerial rotator that is easily operated; finally provision of aerial rotator that is easily installed on masts.
Briefly, in a first aspect, of the aerial rotator of this invention includes a single phase geared electric induction motor. The second aspect is aerial rotator's controller which includes a none locking switch for energizing the electric motor of the aerial rotator to rotate a rotatable member of the rotator, on which aerial to be rotated is mounted, in either of two opposite directions. The third aspect is aerial rotator's rotatable member, rotation controlling means. This includes provisions of configurations for limiting rotatable member's rotation and to facilitate it with automatic rotation direction reversal in a second opposite direction.
Other objects and features will be in part apparent and in part pointed out hereinafter.
Brief description of the drawings
Fig. 1 is a three dimensional view of the aerial rotator.
Fig. 2 is a cross sectional view of Fig. 1 along point XX facing side AA.
Fig. 3 is aerial rotator controller.
Fig. 4 is electrical circuitry of aerial rotator controller of Fig. 3.
Fig. 5 is a photograph of the whole aerial rotating unit with the aerial fixed.
Description of preferred embodiment
Referring to Figs. 1-2 there is shown an aerial rotator of this invention which includes an electric single phase alternating current induction geared motor 26 underneath cover 12 of rotator.
15 It also includes a metallic rotatable member 8 on which is mounted an aerial 40 (See Fig. 5) to be rotated. The rotatable member S protrudes through hole 11 of aerial rotator cover 12 from motor drive 26 and comprise metallic clamp 2 on its upper portion for securing an aerial to be rotated. The aerial clamp 2 includes two insulators 6 sandwiched between its two metallic plates for insulating the aerial to prevent signal grounding. Aerial 40 is fastened on clamp 2 in a horizontal position by four bolts 4 (as illustrated in Fig. 5).
The aerial rotator rotatable member's 8 lower portion consists the invention's rotation limiting and direction reversing means. The means comprise a metallic L-shaped configuration 10 provided on the side of motor 26 rotatable member 8 and meant to be rotated during its rotation. It also comprises an associated I-shaped stationary configuration 28 provided on motor 26 body to fall along L-shaped configuration 10 rotating path (stopper).
The above configurations arrangement is intended to limit rotation of rotatable member 8 when motor 26 operation is initiated. Motor 26 is energized by switch means 34 (Fig. 3) and rotates the rotatable member 8 and the L-shaped configuration 10 attached to it which locks at the stationary 1-shaped configuration 28. The configurations locking prevents further rotation of rotatable
member 8 in the first rotation direction hence limits the rotation.
However, in addition to rotation limiting of rotatable member 8 and that of motor 26, configuration 'I' and V locking is also intended to facilitate the use of alternating current bi-directional flow nature to reverse motor 26 rotation to a second opposite rotation direction. The motor rotation reversal is promptly achieved at the instant of configurations locking as a result of its magnetization pattern reversal due to alternating current (a.c.) flow mentioned above. Its rotatable member 8 consequently also reverses its rotation direction and the second object of
configurations locking is attained. A controlled bi-direction rotating aerial is therefore achieved which rotation may be continuous as long as motor 26 energization is maintained. The rotatable member 8 lower end portion consists its driving gear 30 which is driven by gear 32. Other gears are not illustrated in the drawings. The gears provide speed reduction to facilitate easy tracking of signal which quality is judged by the operator. They also lock rotatable member 8 on whose rests an aerial to be rotated in the selected heading preventing wind interference. The gap around the entry of rotatable member 8 to motor housing is insulated by suitable means like using rubber or self-amalgamating tape to prevent water drip.
The aerial rotator motor 26 is protected from weather effects by rectangular shaped aluminium cover 12 which is fastened to motor 26 and aerial rotator mounting plate 16 by two bolts 18. The base of motor 26 rests on four spacer studs 14 which provide room for turning ravel bolt 20 which fastens the aerial rotator unit on supporting pipe mast 44. The aerial rotator is mounted on supporting pipe mast 44 by inserting raw bolt 20 into pipe to fasten it. The ravel bolt 20 expands and grips pipe's inner surface and firmly secures the unit on mast 44. Other means of mounting the whole system could also be used.
The preferred aerial rotator controller of this invention includes a manually operated non-locking switch 34 (Fig.3 and 4) which is connected to power plug 36 by cable 22. The plug is
connected to preferred alternating current voltage source and control switch 34 plunger is depressed by the operator to extend power to aerial rotator motor 26 through cables 22 and 38.
The two cable 22 portions consists connectors 24 for flexibility of connecting a desired field cable 38 when linking the controller to remote located aerial rotator unit.
The controlling switch 34 is placed at signal monitoring location for example, near television set. Its operation results to rotator motor energization hence rotation of motor's rotatable member 8 on which is mounted aerial 40 (Fig. 5) to be rotated. The aerial is rotated in both clockwise and counter clockwise directions as long as control switch 34 remains operated without the risk of damaging aerial cable 42 (Fig.5). This continuous rotation is enabled by rotation reversing means mentioned above. The facility enables the operator to easily track desired signals by simply depressing controlling switch 34, observing signal quality and releasing the switch to stop aerial rotation. The provision of an easily operated aerial rotator is therefore achieved.
In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.
As various changes could be made in the above constructions and methods without departing from the scope of the invention. It is intended that all matters contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
An apparatus for rotating an aerial to track signals. Its driving means (motor), comprises an automatic rotation direction reversing and limiting means provided on its rotatable member and on the motor body. These two configurations lock at each other during motor rotation and facilitate change in its magnetization pattern which consequently reverses its rotation. This enables easy tracking of signals by simply energizing the motor drive with a switch means. The aerial rotator unit comprising an aerial is installed on pipe mast.

1. An aerial rotator which comprises a rotatable member on which is mounted an aerial to be rotated, and motor adapted to rotate said member and aerial in either of two opposite directions to a desired heading and automatically reverse the rotation on  completing a full rotation.
2.A method according to Claim 1 where the said aerial rotator motor's rotatable member has an L-shaped configuration designed to lock at an associated I-shaped configuration provided on motor body to facilitate rotation limiting and reversing means achieved because of the alternating current flow phenomenon.
3. A method according to Claims 1 and 2, where the said aerial rotator rotation reversing and limiting means provide a continuous clockwise and counter clockwise rotation of rotatable member and aerial mounted on it when motor energization is maintained un- interrupted.
4. A method according to Claim 1 and 3 where aerial rotator is controlled by depressing none locking switch means to energize its motor and to fix the aerial in a particular direction when released.


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