JP3781747B2 - Bird repellent device - Google Patents

Description

  The present invention relates to a bird repellent device, and more particularly to a repellent device for birds such as crows, sparrows, ducks, and seagulls that gather in farmland, fishing ports, bone meal manufacturing factories and the like that serve as bird feeding grounds.

  Needless to say, Japan's agriculture is centered on rice cultivation, and until now, various efforts have been made to reduce the effects of weeds and damage caused by birds. For example, seedlings are made according to the season when raining moderately, transplantation is controlled by using the growth stage difference with weeds, and weeds are suppressed by warming rice paddies, or current seedling box seedlings or paper pot seedlings. Hazard has been suppressed. With the progress of technology, weed control has been able to achieve almost sufficient results with herbicides, but at present, sufficient results have not been achieved with bird damage control.

  For this reason, recently, various bird repelling devices utilizing the ability of birds to detect geomagnetism have been proposed. For example, in JP-A-7-67513 (Patent Document 1), a rod-like MnAlC magnet with a flag suspended is hung on a fixed object with a wire, and the magnetic field is changed by rotating the magnet with wind power or a motor. Discloses a bird repelling device configured to detect and escape a change in magnetic field (fluctuating magnetic field). In addition, as a bird repelling apparatus which changes a magnetic field, Unexamined-Japanese-Patent No. 7-250608 (patent document 2), Unexamined-Japanese-Patent No. 8-38023 (patent document 3), etc. are mentioned.

However, in such a conventional bird repellent device, when it was first installed at a place where birds gathered, it can be felt that birds have not gathered at the installation place and a repellent effect was obtained, but the effect did not always last long. The causes are: (1) the birds get used to the fluctuating magnetic field generated at a certain location, (2) the magnet deteriorates due to the natural environment such as wind and rain, sunlight, etc., and (3) the strong attraction force When a magnet is used, if there is a metal (magnetic) structure around the installation location, the magnet swayed by the wind will be attracted to the metal structure and the like, and a fluctuating magnetic field can no longer be obtained.
JP-A-7-67513 JP-A-7-250608 JP-A-8-38023

  In view of the above-described problems, an object of the present invention is to provide a bird repelling device that can reliably prevent birds from flying to an installation site for a long period of time.

Thus, according to the present invention, a magnet, a nonmagnetic magnet housing body, a covering member made of a foamed polystyrene box that wraps the magnet in the magnet housing body and suppresses the attraction force, and a magnet wrapped by the covering member are enclosed. There is provided a bird repelling device comprising suspension means for suspending the magnet housing so as to be swingable and movably installed.

  According to the bird repellent device of the present invention, the problems (1), (2), and (3) that this type of conventional device has have been solved, and the magnet housing is swung by natural forces such as wind power. By utilizing the change in the magnetic field, it is possible to reliably prevent birds from flying to the installation site for a long period of time. That is, for the problems (1), (2), and (3), the installation position of the magnet housing body in which the magnet is enclosed can be moved by the hanging means, so that the familiarity with the bird magnet (same as above) (Accustomed to the fluctuating magnetic field generated at the installation position), the magnet housing prevents deterioration of the magnet due to the natural environment, enables long-term performance maintenance, and suppresses the magnet's adsorption force to make it metallic ( It can be made difficult to adsorb to a magnetic structure.

In the present invention, the magnet is not particularly limited, and examples thereof include neodymium (Nd—Fe—B) magnets, Sm—Co based magnets, and Fe—Cr—Co based magnets. What has is preferable, and a neodymium magnet is specifically preferable. As this neodymium magnet, a commercially available magnet whose surface is nickel-plated for rust prevention can be used. The shape of the neodymium magnet is not particularly limited, and examples thereof include a flat plate shape, a rod shape, and a granular shape, but a shape that generates as high a magnetic energy as possible is preferable.
In addition, as the bird repellent device of the present invention, it is preferable that at least a radius of about 20 to 30 m from the installation position is a range of the deterrence force against the bird, so that magnetic energy can be secured to the extent that the deterrence force in this range can be obtained It is preferable to devise the size, shape, number, and arrangement of magnets in the magnet housing. For example, when a neodymium magnet having a diameter of 12 to 14 mm and a thickness of 10 mm and having a magnetic flux density of 500 mT is used, placing one magnet at a substantially central position in the magnet housing can increase the range of the deterrence force. It is effective to enlarge.

In the present invention, the suspending means is not particularly limited. For example, the suspension means includes a nonmagnetic hook and a nonmagnetic thread for swingably mounting a magnet housing in which a magnet is sealed in the hook. It is preferable in that it can be easily manufactured at low cost. The rod is not particularly limited as long as it is non-magnetic. For example, a bamboo, glass fiber, or carbon fiber expandable fishing rod that is strong and light and easily available can be used. The yarn is not particularly limited as long as it is non-magnetic. For example, a strong and easily available plastic yarn (for example, a fishing rod made of nylon) can be used.
According to the suspension means having such a configuration, the magnet housing suspended by the thread can be shaken by, for example, wind power, and the magnet can be shaken to change the magnetic field. At this time, if the rod is a highly flexible rod, it is preferable because the variation of the magnetic field becomes more complicated because the rod is greatly shaken. It should be noted that the wrinkles and threads do not interfere with the magnetic energy because they are non-magnetic. In addition, if the magnetic field is continuously changed at a fixed installation position, the bird gets used to it. However, according to the suspension means in the present invention, the installation position can be easily changed by moving the entire apparatus with a hook. Therefore, the place where the fluctuating magnetic field is generated can be easily changed, and it is possible to prevent the birds from getting used to the fluctuating magnetic field.
In addition, as another suspension means, the structure which provided the wheel member which moves a rail and a rail manually under the eaves of a building, and put the magnet accommodating body which put the magnet in this wheel member with the said thread | yarn may be sufficient. In this case, it is effective for installing this apparatus in a long building. The rail and the wheel member are preferably made of a nonmagnetic material.

  The bird repellent device of the present invention may further include a covering member made of a nonmagnetic material that wraps the magnet in the magnet housing. This covering member can further suppress the magnet's adsorption force, so even if this device is installed in the vicinity of eaves and pillars made of steel, the magnet can be reliably prevented from being attracted. Oscillation can be maintained. The form of the covering member is not particularly limited as long as it covers the entire magnet, and examples thereof include a bag shape, a box shape, and a sheet shape. In addition, examples of the nonmagnetic material constituting the covering member include plastics such as foamed polystyrene, synthetic or natural rubber, wood, paper such as corrugated cardboard, etc., among which foamed polystyrene that is lightweight and effective as a protective material for magnets. Is preferred.

  In the present invention, the magnet housing body is not particularly limited as long as it is made of a non-magnetic material and can enclose a magnet. It is preferable in terms of ease of manufacture, easy weight reduction, and large sway even in light winds. The bag is preferably made of a non-magnetic sheet and made of an aluminum foil capable of reflecting external light and a plastic film laminated on the aluminum foil. According to such a bag, since the aluminum foil reflects outside light and shines, the alertness of the bird is increased, so that the repelling effect can be further enhanced. Further, since the magnet is protected from the natural environment such as wind and rain and sunlight by the bag, deterioration such as rusting of the magnet can be prevented, and the performance of the magnet can be maintained for a long time. The shape and size of the bag is not particularly limited, but it is preferable that the bag containing the magnet is shaken by a breeze and is not blown by a strong wind, for example, an envelope shape of 9 cm × 12 cm to 22 cm × 33 cm. Things.

  Hereinafter, embodiments of the bird repelling apparatus of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to an Example.

FIG. 1 is an overall view showing an embodiment of a bird repellent device according to the present invention, and FIG. 2 is a partial sectional front view showing a bag and its internal configuration in the embodiment.
This bird repellent device includes a glass fiber stretchable cocoon 1, a nylon thread 2 with one end fastened to the tip of the heel 1, and an aluminum foil laminate film attached to the other end of the thread 2. And a single neodymium magnet 4 enclosed in the bag 3 and a foamed polystyrene covering member 5 that encloses the neodymium magnet 4.

  The length of the kite 1 is about 4.5 m in the stretched state, and the length of the yarn 2 is 0.5 to 1.0 m. The bag 3 has a rectangular shape of 9 cm × 15 cm, and the outer peripheral edge is sealed by welding or adhesion. A hole 6 for tying the yarn 2 is provided on the upper edge of the bag 3, and reinforcing tape 7 is attached to both surfaces around the hole 6. The neodymium magnet 4 has a cylindrical shape with a diameter of 12 to 14 mm and a thickness of 10 mm, and the magnetic flux density is 500 mT. The neodymium magnet 4 is fixed to the inner surface of the covering member 5 by being wrapped in the covering member 5 made of styrene foam.

[Experimental example]
The bird repelling device of the embodiment configured as described above was installed in a place where crows gathered, and an experiment was conducted to test the repelling effect on crows. The installation location is around the electric pole near Honda Oil & Fat Factory, 1-38 Nagarakucho, Takaoka City, Toyama Prefecture, and five sets of this equipment were installed around the electric pole at intervals of 30m from April 8th to August 30th, 2003. The number of crows was observed visually at around 7-8 am every day. The results are shown in Table 1. In Table 1, the blank part is not observed.

As shown in Table 1, about 100 crows gathered on the day before the installation of this device (April 7), but on the first day of installation (April 8), the number dropped dramatically to three. After that, there was a day when the number of crows jumped and increased, but from the observation for about 5 months, the number of crows has been declining in general, and in the period from mid-July to the end of August, no one bird has come. It turns out that the day was increasing. It was also confirmed that the droppings under the electric wires were disappearing as the number of flying crows decreased.
From this experimental result, it has been found that the bird repellent device of the present invention can reliably and effectively provide a repellent effect on crows over a long period of time.

[Other experimental examples]
1. In order to confirm the extent of the range of deterrence against birds of the avian repellent device of the present invention, 6 sets of this device were installed at approximately equal intervals in a 4-hectare paddy field (1287 Akakura, Oyabe City, Toyama Prefecture) Each device was moved every 10 days. The observation period is from April 20th to August 31st, 2003.
As a result of the observation, it was found that crows and ducks were hardly accessible, so it was possible to eliminate the effects of ducks and crows on paddy fields.
2. This set of equipment was installed at 20 m intervals in the fish parcel market adjacent to the Himi fishing port where crows and seagulls frequently invaded. The observation period is from May 20th to August 31st 2003.
As a result of observation, crows and seagulls no longer invade, and no stool damage.
Three sets of this apparatus were installed in a 3.5 are fig field (Akakura 1287, Oyabe City, Toyama Prefecture) and moved every 20 days. The observation period is from August 10 to October 15, 2003.
As a result of the observation, there was no damage caused by crows or starlings in the fig field.

It is a general view which shows the Example of the bird repellent apparatus which concerns on this invention. It is a partial cross section front view which shows the bag and its internal structure in the Example.

Explanation of symbols

1 Firewood (made of bamboo, glass fiber or carbon fiber)
2 Thread 3 Bag (Magnet housing)
4 Magnet 5 Covering member

Claims (1)

A magnet, a nonmagnetic magnet housing, a covering member made of a foamed polystyrene box that wraps the magnet in the magnet housing and suppresses the attraction force, and swings the magnet housing that encloses the magnet wrapped by the covering member A bird repelling device comprising suspension means for suspending the installation position so as to be movable.

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