Electrical system adapted to keep pigeons away from buildings

Abstract: This invention concerns an electrical system adapted to keep pidgeons and other birds away from buildings in general, and in particular from the fronts of churches, architectural buildings, hospitals, residential buildings and so on. Said system substantially comprises a static electrical pulse generator which supplies one or more conductors with pulses having a high voltage but a low electrical power and a short duration, whereby this voltage applied to said conductors, comprising protective lines adapted to be fastened to portions of the buildings to be protected, keeps away the pidgeons when the latter try to perch on said protective lines.

Description: This invention concerns mainly an electrical system for keeping pigeons or other birds away from buildings, in particular from the fronts and from the architectural details of said buildings while, on the other hand, the pidgeons or other birds are not subjected to any material damage nor to even the slightest shock. As it is known, there is a remarkable damage caused to the buildings by the deposits left by pigeons, in particular to the artistic public property comprising churches, monumental buildings and other public buildings, hospitals and residential buildings. There are embodiments and methods already practiced in this art for keeping pigeons away from buildings, but they have not provided final results and some of them have proved damaging to the pigeons while others, in the long run, have proved damaging to the architectural details they were supposed to protect. Among the above embodiments, it deserves a particular attention the one based on ultrasonic waves. After a certain time though this method becomes ineffective, because the pigeons get accustomed and in addition the use thereof is not advisable in cities where it can become a nuisance if it is desired to have such an intensity to become at least slightly bothersome for the pigeons. There should also be recalled herein the passive protection method, based on tight wires, spikes and so on. This method acquires a certain value if it is used as a support for an active protective method, but it can be used only for moderate importance protections. A further method which was used at least in the past is the deposition of sticky pastes on the parts to be protected. Today it is not even allowed and furthermore, as the months go by its effectiveness gets strongly reduced whereby eventually, after a little longer than one year, the action thereof becomes insignificant. Therefore, after a certain time, it is necessary to protect again the architectural details with the paste, and meanwhile they remain all smeared in that the pastes blacken and melt down. Eventually, the method of the slippery silicon pastes does not have the disadvantage of entangling the pidgeons, but with this system as well, as time goes by, the protective action is progressively reduced, until it becomes ineffective. These pastes as well blacken, they melt and definitely smear the datails they are supposed to protect. An electrical system is also known, as disclosed in DE-A-39 14894, adapted to keep away the pigeons when the latter go to perch with their legs on protective lines located a short distance from each other and fastened to the buildings to be protected. This system comprises a pulse generator producing high voltage pulses of short duration and therewith also low power connected to the protective lines. But this system has the drawback that no means are provided to enable the most appropriate voltage in relation to the length and configuration of the protective lines. It is an object ot this invention to eliminate the above mentioned drawbacks, by providing an electric system comprising a pulse generator producing high voltage pulses of short duration and therewith also low power and connected to protective lines which are fastened to the building characterized in that at the outlet from the pulse generator there is provided a pair of electrical circuits having a voltage different from each other and adapted to be alternatively connected to said protective lines in order to enable the most appropriate voltage to be used, according to the lenght and configuration of the protective lines. The features and the advantages of this invention will become apparent from the following detailed description of a non exclusive preferred embodiment of the subject system, shown for purely exemplary and non limiting purposes in the attached drawing, wherein: Figure 1 shows the electrical block diagram of the subject electrical system; Figure 2 shows the application of the subject electrical system to various architectural details to be protected; and Figures 3, 4, 5 show three examples of protective lines of the subject electrical system. Referring now to Figure 1, the block diagram of the electrical circuit for the subject system shows, connected to each other, an electrical pulse generator 1 and two electrical circuits comprising common conductor 2 and conductors 3 and 4 respectively. Both conductor 3 and conductor 4 may be connected to conductor 5 by means of switch 6, whereby the circuit comprising conductors 2 and 5 feeds protective lines 7 at different voltages. Electrical pulse generator 1, fed from the alternate current grid, or by direct current batteries, provides said electrical circuit 2, 5 with high voltage pulses having a low electrical power and a short duration. In particular this circuit may be operated at different voltages in order to be able to use the voltage which is most appropriate relative to the length and configuration of protective lines 7. For instance, the operation voltage for circuit 3, 5, 2 used for an average size protective system is approximately 6000V, while it is 5000V if used in a large size protective system. In the same way, the operating voltage of circuit 4, 5, 2 in the case of a medium size system is about 4500V, while in the case of a large size system it is about 3800V. Nevertheless it should be noted that in some particular cases said voltages may be reduced also drastically. The frequency of the high voltage pulses is approximately 50 pulses per minute while each pulse duration is about 0,55 to 0,7 milliseconds, according to a lower or upper limit of the protective line length. The power involved is very low, in that a pulse electrical charge is about 0,3 to 0,4 millicoulomb, since the pulse generator comprises a static electronic apparatus and is based on a charge and discharge sequence, at the frequency of 50 pulses per minute, of suitable capacity condensers. Protective lines 7 may be different types and in Figures 3, 4 and 5 three types are shown, for exemplary purposes. Referring now to Figure 3, conductor 5 comprises strap wire 5A which is fastened to the portion of building to be protected by means of screws 8 and it is connected to the negative terminal of generator 1. Strap wire 5A carries pins 9, uniformly spaced from each other, and bearing special purpose insulators 10, adapted to prevent surface discharge and leakage currents also in the most adverse weather conditions. On said insulators there is fastened conductor 6A, connected to the positive terminal of generator 2. Referring now to Figure 4, the pair of conductors 5B and 6B comprising part of protective line 7, are supported by pass-through insulators 11 made of transparent and insulating material. The lower position conductor, shown at 5B in the Figure, is connected to the negative terminal of generator 1, while the one in the upper position, shown at 6B, is connected to the positive terminal of generator 1. For fastening the protective line to the architectural structures, lower conductor 5B is mounted on said structures by means of screws and bands 12. Referring now to Figure 5, conductors 5C and 6C of protective line 7 are led through pairs of grooves 13 and 14 respectively, provided on the upper part of insulators 15, only one of which is shown in Figure 5. Each said insulators 15 are comprised of a slab 16 and a small plate 17, both of them being made of an insulating and transparent material. Small plate 17 closes up the top of grooves 13 and 14 and is locked on top of the slab by a screw 18 which at the same time is used to fasten insulator 15 to the building portion to be protected. Fastening of protective lines 7 onto the architectural details to be protected may be performed as well by means of special corrosion resitant resins, replacing the screws. The subject electrical system may be comprised of multiple sections, each including a set of protective lines, and in such a case each section is fed by its own pulse generator. The latter approach enbles as well the system operation to be partitioned, by keeping in operation only selected sections, according to need, or by switching the generators from one section to the other, since they are interchangeable. In addition, the above system is supposed to be completed by providing timers 19, one of which is shown in the diagram of Figure 9, connected to generator 1, in order to connect or disconnect electrical power to the various sections, according to an operating schedule which may be pre-arranged. Furthermore, there is provided an alerting or warning, visually or acoustically operating device 20 (Figure 1), which is in turn connected to the pulse generator, in order to give a warning in case the latter goes off. In Figure 2 it is apparent how protective lines 7 are fastened to the various details of building 21, in such a way that the voltage applied to the conductors of protective lines 7 keeps away the pidgeons when they try to perch with their legs on said lines which are installed close to each other, their distance being such that both conductors come in contact with the pidgeon legs. Practical or embodimental modifications may be made to this invention while not exceeding the scope thereof, as defined in the attached claims.

Claims: An electrical system adapted to keep pigeons or other birds away from buildings comprising a static electrical pulse generator (1) producing high voltage pulses of short duration and low electrical power whereby said voltage, applied to protective lines (7) adapted to be fastened to portions of the buildings to be protected, keeps the pigeons away when the latter try to perch with their legs on said protective lines (7) located a short distance from each other, characterized in that at the outlet from the electrical pulse generator (1) there is provided a pair of electrical circuits (3, 5, 2; 4, 5, 2) adapted to be alternatively connected to said protective lines (7) and said electrical circuit have a voltage different from each other in order to enable the most appropriate voltage to be used, according to the length and configuration of the protective lines (7). The electrical system of Claim 1, characterized in that said protective lines (7) comprise a strap wire (5A) fastened to the portion of the building to be protected and connected to the negative terminal of the generator (1), said strap wire (5A) carrying insulators (10) fastened thereto and bearing a conductor (6A) connected to the positive terminal of the generator (1). The electrical system of Claim 1, characterized in that said protective lines (7) comprise a pair of conductors (5B, 6B) supported by pass-through type insultors (11) of an insulating transparent material, wherein the lower positioned conductor (5B) is fastened to the portion of the building to be protected and is connected to the negative terminal of the generator (2), while the conductor (6B) in the upper position is connected to the positive terminal of the generator (2). The electrical system of Claim 1, characterized in that said protective lines (7) comprise a pair of conductors (5C, 6C) respectively connected to the negative and to the positive terminal, passing through a pair of grooves (13, 14) provided in the top portion of the insulators (15) comprising insulating and transparent material slabs (16) and small plates (17) of insulating and transparent material adapted to top off said grooves (13, 14) and locked on said slab (16) by means of a screw (18) which in turn fastens the insulator (15) to the portion of the building to be protected. The electrical system according to the previous Claims, characterized in that it includes several sections, each comprising protective lines (7), each section being fed by a generator (1). The electrical system of Claim 5, characterized in that a timer (19) is connected to the generators (1) in order to switch on or off the electrical supply to the various sections, according to a predetermined schedule. The electrical system of the previous Claims, characterized in that a visual or acoustical alerting or warning device (20) is connected to the generator (1) in order to give a warning if the latter should fail. The electrical system of Claim 1, characterized in that the operating voltage of said electrical circuits (3, 5, 2; 4, 5, 2) is normally about 3800V to 6000V, the high voltage pulse frequency is about 50 pulses per minute, the duration of each pulse is 0,55 to 0,7 milliseconds depending upon the shorter or longer extension of the protective lines (7), the electrical power used is low since the pulse electrical discharge is about 0,3 to 0,4 millicoulomb and the pulse generator (1) comprises a static electronic device based on a sequence of charge and discharge of suitable capacitors, at a frequency of 50 pulses per minute.

Inventors: GALLIANI ETTORE, GALLIANI, ETTORE
Applicants: GALLIANI ETTORE, DITTA ETTORE GALLIANI
Application year: 1990
Main classification: H05C1
IPC codes: H05C1, A01M29