ELECTROSHOCK TYPE INSECT-PROOF DEVICE

Abstract: Electroshock type insect-proof device consisting of a chamber (2) having an opening (3), at least a pair of electrodes (5a), (5b), to which a voltage is applied, arranged in parallel with each other via an insulating gap (W) on a wall surface (1a) around the opening (3), and a stopper member provided between the chamber (2) and electrode (5b) so as to project beyond the surface of the electrode (5b). This device is adapted to give an electroshock to a cockroach entering the chamber (2), and thereby reliably prevent the entry of the cockroach into the chamber (2).

Description: The invention relates to an apparatus for preventing invasion of sanitarily harmful small-size creeping animals into a storing space having a vertical wall on the periphery of the opening thereof as well as a door, said door having a vertical wall opposite to the said vertical wall on the periphery of the opening of the storage space when the door is closed. Storing spaces of the type in question are kitchen furnitures, wash basin cabinets, various storing cabinets, as well as living spaces such as living rooms, bath rooms and others. It is known that, when a voltage is applied between arbitrary two legs of a cockroach, since cockroaches secrete adhesive substance on the underside of tip parts of their legs, they are very sensitive to the electric shock. The below-described experiment examined, by applying various values of voltages between two legs of cockroaches, what degree of electric shocks they have to those various voltages. In the experimental setup shown in Fig. 1, 1a and 1b (Examined Japanese Utility Model Publication 57-8701) are band shaped electrodes made of aluminum plates or the likes, they are disposed in parallel to each other keeping an insulation spacing W on an insulator plate 2. Then, dc voltages are applied by a dry cell 3 between those electrodes 1a and 1b. Hereupon, letting a cockroach 4 creeping around over the insulator plate 2, when any two legs of the cockroach 4 touch with the electrodes 1a and 1b thereacross, a dc voltage by the dry cell 3 is applied between those two legs of the cockroach 4. Then, by varying the voltage of the dry cell 3 to various values, degrees of reactions to the electric shock at those various applied voltages were examined and the obtained results are as shown in the following Table 1. From the above results, it is understood that cockroaches start to feel the electric shock at about 6 volts. And from measurements of resistances between two legs of these cockroaches, they were found to be about 2 MΩ for black cockroaches while about 1 MΩ for brown wing cockroaches. From the above-described experiment, since cockroaches start to react at about 6 volts, in current values, it is understood that the electric shock starts at about 3 µA for black cockroach and 6 µA for brown wing cockroach, respectively. From the above cockroach electric shock test, it was found that the cockroaches sensitively feel the electric shock; in the experiment described below, wherein an experimental setup of Fig.1 is held in a vertical plane keeping the direction of the electrodes 1 and 2 laterally, when tested cockroaches were set free on an insulation plate 2 at the part below the electrodes 1 and 2, letting them creep crossing the electrodes 1 and 2 upward, it was tested, at various voltages, whether the cockroaches can pass across the electrodes 1 and 2 or not. In Table 2, the result is shown. In this manner, it is possible to let cockroaches fall down by giving them appropriate electric shocks, and therefore, by applying voltages of about 10 volts or higher for brown wing cockroach and about 20 volts or higher for black cockroach on a vertical plane, the movement of cockroaches across the electrodes can be prevented. After giving the cockroaches experiences of electric shocks several times as described above, soon they become to stop in front of the electrodes and intend to go back in the opposite direction, and finally they never intend to come to the vicinity of the electrodes. This is because the cockroaches gain a kind of learning effect after they experienced electric shocks several times, and they start to defend themselves when they infer something dangerous in their sights. This is also understood from the fact that, after their experience of electric shocks, they react on a dummy electrode made of the same material but having no voltages at all. Therefore, with this kind of apparatus, besides giving electric shocks, a kind of evasive effect to make cockroaches kept out from the apparatus is also be obtainable. The principle of using two spaced electrodes for emitting an electric shock to creeping animals is also disclosed in DE-A-2 930 171, applied to a floor ledge. According to the practical embodiments shown in said document an electric shock is applied to any animals creeping from the floor upwardly in a gap formed between a plate or the like supporting the two spaced electrodes and a cover plate. Thus, any shocked animals fall downwardly back to the floor of the room. Finally, the same principle of using two spaced electrodes for emitting an electric shock to creeping animals is disclosed in GB-A-1 604 155. In this document there is disclosed a barrier having a base portion buried into ground and at least one vertical or inclined wall portion on which two spaced electrodes are arranged in the longitudinal direction of said wall. In this manner a fence like structure of obtained. The object of the present invention is to provide an apparatus for preventing an invasion of sanitarily harmful small-size creeping animals into a storing space having an opening on the periphery of which a vertical wall is provided, and a door for closing the opening. Said object is achieved by the features that at least a pair of electrodes, to which a voltage is to be applied, is provided on the vertical wall of the periphery of the opening of the storage space and /or on the opposite vertical wall of the door, said pair of electrodes defining an insulation space therebetween, and an obstructor element is disposed adjacent said electrodes between said opening of said storage space and said electrodes and projecting from the plane of at least one of said electrodes. By providing the above features invasions of small-size creeping animals into the storing space can substantially be prevented. Such animals like cockroaches creeping from outside touch the electrodes, thereby receiving an electric shock, so that they fall down outside the storing space as it is shown by arrow A in Fig. 2. At the same time by providing the obstructor element occasional falling of a cockroach inside the storing space as indicated by an arrow B in Fig. 2 is prevented. Below preferred embodiments of the present invention are described referring to the drawings. Fig. 1 is a plan view showing an electric shock insecticide apparatus that becomes a premise of the present invention; Fig. 2 is a sectional view of the above-mentioned apparatus for explaining a problem arising when this apparatus is installed into a storing cabinet; and Fig. 3 through Fig. 9 are perspective views and sectional views of principal part showing embodiments of the present invention. In Fig. 3 and Fig. 4, 1 is a storing body providing a storing space 2 in which tableware, food, or people are accomodated; in this embodiment, although it is shown as a storing cabinet, it may be a kitchen furniture, a wash basin cabinet and others, and further may be a wall body of a building constituting a living space such as a living room or a bath room. 3 is an opening formed on a part of the storing body 1, in a storing cabinet, it is a door part through which stored stuffs are put in and out, and in case of on a wall body of a building, it is a window or a room entrance for people. 5a and 5b are a pair of electrodes made of an electro-conductive material disposed in parallel to each other keeping a small insulation spacing W (about 2 mm) on a wall part 1a on a periphery of the opening 3, and it is made integral with an insulation material 6, so that a part of the insulation material 6 exist in the insulator spacing W between electrodes 5a and 5b and thereby preventing their touching and electric conduction. In the above installation, installation means such as adhesive and tackers are used adequately. 7 is an obstructer formed, near one of electrode 5b, on the wall part 1a between the storing space 2 and electrodes 5a, 5b, and it is formed with a projection from the plane of the electrode 5b, 8 is a power source for applying a voltage to the electrodes 5a and 5b, and although for which either a commercial power line or a dry cell may be used, in the present embodiment a dry cell is used, and its positive side is connected through electric wires 9 to the one side electrode 5a and its negative side is to the other side electrode 5b, respectively. As for the voltages of the above-mentioned power source 8, a voltage of about 6 volts or higher than that is sufficient for giving electric shocks to a cockroach 4; although much higher voltages may also be used, if it is made as much higher as giving electric shocks to human bodies, the electrodes 5a and 5b can not be disposed at those places where the fear of giving electric shocks to human bodies, and therefore suppressing the voltage less than about 30 volts is most suitable in view of giving sufficiently strong electric shocks to the cockroach 4 while preventing to give electric shocks to human bodies. However, when the electrodes 5a and 5b are installed to those places where no fear of giving electric shocks to human bodies, voltages higher than 100 volts can be used. And, for the case of using the suitable voltage of 30 volts from the commercial power line, a transformer (not shown) can be used for dropping the voltage. In the constitution described above, as shown in Fig.4, since a current flows from the power source 8 to the cockroach 4 touching across the electrodes 5a and 5b, the cockroach 4 which feels the electric shock tries to run away the electrodes 5a and 5b, but it is hit with the obstructer 7 and is bounced therefrom as indicated by an arrow mark A, then falls down as an arrow mark B, hence, it is very seldom to reach the storing space 2. That is, by this bouncing, since the cockroach 4 becomes to fall down in the posture or in the direction more distant from the opening 3, or becomes to fall from a more distant position, even when the air flow is present, it is very seldom to fall down inside the storing space 2. In the above-described embodiment, although an example wherein the electrodes 5a and 5b are disposed in a vertical plane has been explained, those electrodes 5a and 5b may also be disposed in a horizontal plane 1a as is shown in Fig.5 and Fig.6. In this example, although the cockroach 4, which feels an electric shock and collides with the obstructer 7 jumps up and thereafter occasionally falls down inside the storing space 2, normally it is bounced back outside the storing space 2 as an arrow mark A, and hence the invasion of the cockroach 4 into the storing space 2 can be made less. In the above, since after the cockroach 4 jumps up, it occasionally reaches inside the storing space 2, in order to prevent this, by extending the obstructer 7 up to the part above the electrodes 5a and 5b as shown by a broken line 7' in Fig.6, the cockroach 4 collides further with this extended part 7', and thereby the above-mentioned inconvenience hardly happen. Examples after Fig.7 show embodiments having a door 10 which opens and shuts the opening 3, and in those examples, even if a gap T arises between a wall plane 1a of a storing body 1 and the door 10 due to a warp of the door 10 or due to an error caused on its production, owing to the disposition of the electrodes 5a and 5b similarly to the above-mentioned example as well as the formation of the obstructer 7, the invasion of the cockroach 4 into the storing space 2 can be made less. That is, although the cockroach 4 which feels the electric shock and collide with the obstructer 7 occasionally reaches the storing space 2 through the gap T, mostly it is bounced back as an arrow A shown in the figure and runs away toward outside. Hereupon, Fig.7 through Fig.9 show examples wherein the obstructer 7 is provided on the storing body, and in these examples, regardless of the open or shut state of the door 10, the invasion of the cockroaches into the storing body 1 can be prevented. And, among these examples, in Fig.7 and Fig.8 the obstructer 7 is formed with a flexible material such as rubber having a buffer effect, and in Fig.9, the obstructer 7 is formed by making the wall plane 1a itself project. The reason of making the obstructer 7 with a flexible material is for the consideration for preventing accidentally happening damages caused by hitting the obstructer 7 with stuffs to be stored at the occasion of storing those stuffs into the storing space 2. And in the examples shown in Fig.8 and Fig.9, by setting the peripheral plane level L close to the level of the obstructer 7, escapes of the cockroach 4 toward outside is made easier. As is clear from the explanations given to those embodiments described above, since the electric shock insecticide apparatus of the present invention comprises a constitution having an obstructer projecting from the electrode plane in the vicinity of those electrodes, after cockroaches feeling the electric shock, they collide with the obstructer and is mostly bounced back outward, thereby the invasion of cockroaches can be made less. Besides, although it is sufficient to provide at least a pair of electrodes, if necessary, two pairs or more may be provided.

Claims: Apparatus for preventing invasion of sanitarily harmful small-size creeping animals into a storing space (2) having a vertical wall on the periphery of the opening (3) thereof as well as a door (10), said door having a vertical wall opposite to the said vertical wall on the periphery of the opening (3) of the storage space (2) when the door is closed, wherein at least a pair of electrodes (5a, 5b), to which a voltage is to be applied, is provided on the vertical wall of the periphery of the opening (3) of the storage space (2) and/or on the opposite vertical wall of the door (10), said pair of electrodes (5a,5b) defining an insulation space (B) therebetween, and an obstructor element (7) is disposed adjacent said electrodes (5a,5b) between said opening (3) of said storage space (2) and said electrodes (5a,5b) and projecting from the plane of at least one of said electrodes (5a,5b) to prevent the animals from falling into said opening (3). Apparatus in accordance with claim 1, characterized by means for applying a voltage between about 6 volts and about 30 volts across said electrodes (5a,5b). Apparatus according to claim 1 or 2, characterized in that said at least one pair of electrodes (5a,5b) is disposed on the vertical wall on the periphery of the opening (3) of the storage space (2). Apparatus according to claim 1 or 2, characterized in that said at least one pair of electrodes (5a,5b) is disposed on the vertical wall of the door (10) opposite to the vertical wall on the periphery of the opening (3) of the storage space (2). Apparatus according to claim 1 or 2, characterized in that one (5a) of said electrodes is disposed on the vertical wall of the periphery of the opening (3) of the storage space (2), and the other electrode (5b) is disposed on the door (10). Apparatus according to any one of claims 1 to 5, characterized in that said obstructor (7) is made of a flexible material. Apparatus according to any one of claims 1 to 6, characterized in that in the insulation space (W) between said pair of electrodes (5a,5b) there is disposed an insulation material so as to form an integral structure comprising said electrodes (5a, 5b) and said insulation material.

Inventors: MURAKAMI, RYOHEI, OKA, JIRO
Applicants: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Application year: 1985
Main classification: A01M1
IPC codes: A01M29, A47B77, A01M19, A01M1