DE20307233U1 - Stop device for preventing rodents, especially rats from entering residential buildings from sewer pipes or refuse chutes, with sewer pipe having tube section, the inner wall of which is fitted with electric conductors - Google Patents

Abstract

A tube section (16) is provided in the sewer pipe (10). The inner wall of the tube section is fitted with electric conductors (36,46), which are either individually or collectively supplied with electric voltage. The distance between the conductors is smaller than the body length of the rodent, so that an electric bridge is formed through the rodent between two electric conductors which will either kill or paralyze the rodent.

Description

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May 8, 2003 II '. *I'. I'I I.!

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DESCRIPTION

Barrier device for rodents, especially rats TECHNICAL FIELD

The invention relates to a blocking device in sewage pipes, household waste pipes and similar lines, by means of which rodents, such as in particular rats, are to be blocked from entering buildings through such lines.

In buildings, especially residential buildings, there is a risk that rodents, such as rats in particular, can enter the buildings through the sewage pipes or household waste pipes or similar pipes.

STATE OF THE ART

DE 689 10 518 T2 discloses a rodent barrier that is intended for use in vertical sewer lines to prevent rodents such as rats from entering residential buildings or other buildings via such sewer lines. This rodent barrier has a frame with a flange on which a cone made of spring wires or rods is arranged, which tapers in the direction of the sewage flow. This rodent barrier uses mechanical blocking elements. Such mechanical blocking elements taper sewer lines and therefore pose an increased risk of blockages in the corresponding drain line.

In addition to mechanical rat barriers, electrical devices are also known to deter rats or similar animals

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can be destroyed. Such an electrical device, known from DD-PS 74 159, consists of an insulating base on which a system of several parallel bare electrical conductors is applied in such a way that the distance between two adjacent conductors corresponds to the size of the animal to be killed, in that the animal to be killed must touch two of these electrical conductors at the same time when crossing the base. The base with its electrical conductors is laid out in the room to be protected and connected to an alternating or direct voltage, with a protective voltage that is harmless to humans but lethal to rats, for example, being used. Such a base, like the rodent barrier mentioned above, would also reduce the clear interior of a drainpipe and thus pose the risk of pipe blockage if used in drainpipes.

DESCRIPTION OF THE INVENTION

Based on this previously known prior art, the invention is based on the object of providing an improved blocking device for rodents, such as in particular rats, in sewage pipes, household waste pipes and similar lines.

This invention is defined by the features of claim 1. Useful developments of the invention are the subject of subsequent further claims.

According to the invention, the pipeline preventing the entry of rodents or rats into buildings 35

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has a section of pipe that acts as a blocking device and in particular does not narrow the interior of the pipe in question. The section of pipe that is designed as a blocking device has electrical conductors in its inner wall that are arranged flush with the inside of the pipe or section of pipe. When crawling through the pipe, the electrical conductors, as is known per se, represent a deadly barrier for rodents, such as rats in particular, in that the animal in question triggers a fatal electric shock when it touches two of these conductors at the same time.

In order to prevent water flowing through the pipe and past the electrical conductors from creating an electrical bridge across the water with other electrically conductive pipe parts or objects, whether present or absent as part of the design, the end areas of the pipe section designed as a blocking device are electrically protected against earth.

The electrical conductors can be connected to either a direct current or an alternating current.

If more than two electrical conductors are provided, at least the middle of these conductors will be connected to the positive conductor of an electrical voltage source. 30

Further embodiments and advantages of the invention can be taken from the features further listed in the claims and the following embodiments.

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SHORT DESCRIPTION OF THE DRAWING

The invention is described and explained in more detail below with reference to the embodiments shown in the drawing. They show:

Fig. 1 is a longitudinal section through a sewer pipe containing the blocking device according to the invention,

Fig. 2 is a view similar to that of Fig. 1, with a further embodiment of the locking device according to the invention.

WAYS TO CARRY OUT THE INVENTION

Fig. 1 shows a section of a sewage pipe arranged in a vertical orientation from a sewage pipe system. Between an upper pipe section 12 and a lower pipe section 14, a middle pipe section 16 is installed, which is equipped with an electrical blocking device for rodents, such as rats in particular.

Just like the other pipe sections 12, 14, the pipe section 16 also has a ring-shaped bead 20 that curves outwards at its head end 18. A circumferential O-ring 22 is located inside the bead as a sealing element. The foot end 24 of the pipe section 16 in the present case has an annular cross-section that corresponds to the circular cylindrical cross-section of the rest of the pipe section 16 and thus also to the cross-section of the other pipe sections 12, 14 present in the wastewater pipe 10. In this way, the inside 26 of the wastewater pipe 10 and thus also of the pipe section 16 has a circular cylindrical shape that extends in a straight line along the central axis 30.

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A circumferential ring plate 34 is arranged in the upper third of the wall 32 of the pipe section 16. This ring plate 34 is recessed into the wall 32 and runs flush with the inner side 26. The ring plate 34 is made of electrically conductive material. The ring plate 34 is connected to an electrical voltage source, which is not shown in the drawing, via a positive conductor 36 leading out of the outside of the pipe section 16.

At a central distance 40 below the ring plate 34, another such ring plate 44 is sunk into the pipe section 16 and is also flush with the inner side 26. This ring plate 44 is also connected to the aforementioned electrical voltage source via a neutral conductor 46. The distance 40 is such that a rat or similar rodent crawling through the sewage pipe 10 and thus through the pipe section 16 must at some point touch the two ring plates 34, 44 simultaneously. Such a rat then forms an electrical bridge between the two conductors 36, 46. When electrical voltage is applied to the positive conductor 36, an electrical current will flow through the rat. This electrical current will be designed in such a way that this rat is killed. However, the current intensity could also be designed so that the rat is not killed, but only paralyzed. In the latter case, the rat would also fall down through the sewer pipe 10 in the same way as if it were killed and would not be able to clog the sewer pipe 10. In any case, the electrical voltage applied would not be so great as to be dangerous to humans.

For safety reasons, a 35 mm clearance is provided above the ring plate 34 and below the ring plate 44.

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further ring plates 54 and 64 are arranged. These two ring plates are also electrically conductive and are flush with the inner side 26 in the pipe section 16. These two ring plates 54, 64 are connected as protective conductors to earth 56 and 66, respectively. In this way, it can be prevented that water flowing through the wastewater pipe 10 or other electrical line bridges can form in neighboring pipe sections.

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In the sewage pipe 10.2 shown in Fig. 2, a ring plate 34 is also connected to an electrical voltage source via a positive conductor. In contrast to the sewage pipe 10, a left and right ring plate 44, 44.2 are arranged on both sides of the ring plate 34 at a distance of 40 in Fig. 2. These two ring plates 44 and 44.2 are also connected to the electrical voltage source via a respective neutral conductor 46 and 46.2. A rat crawling through the sewage pipe 10.2 would therefore trigger an electrical current flowing through its body via the conductors 34 and 44.2, both if it crawled through this pipe 10.2 from the right as shown in Fig. 2. If the rate from - to the left in Fig. 2 - crawls through the sewage pipe 10.2, it would trigger this electric current via the ring plates 34 and 44. The sewage pipe 10.2 is therefore preferably used in non-vertical sewage pipe systems, but rather in slightly inclined sewage pipe systems, for example.

Claims (7)

1. A blocking device in sewage pipes ( 10 , 10.2 ), household waste pipes and similar pipes in buildings, in particular residential buildings, by means of which rodents, in particular rats, are prevented from entering these buildings through such pipes, characterized in that - in the sewage pipe ( 10 ) there is a pipe section ( 16 , 16.2 ), the inner wall of which is equipped at least in regions with electrical conductors ( 34 , 44 , 54 , 64 , 44.2 ) which can be individually or jointly charged with electrical voltage and which are arranged at a mutual distance ( 40 ) which is smaller than the body length of a rodent, so that such a rodent can create an electrical bridge between at least two electrical conductors ( 34 , 44 , 44.2 ) and cause the flow of an electrical current which kills or paralyzes this rodent. 2. Locking device according to claim 1, characterized in that - the two line ends of the pipe section ( 16 ) are electrically insulating ( 54 , 64 , 56 , 66 ). 3. Locking device according to one of the preceding claims, characterized in that - the electrical conductors ( 34 , 44 , 44.2 ) can be connected to an alternating voltage. 4. Locking device according to one of the preceding claims, characterized in that - the electrical conductors ( 34 , 44 , 44.2 ) can be connected to the positive conductor or to the neutral conductor ( 46 , 46.2 ) of an electrical voltage source. 5. Locking device according to one of the preceding claims, characterized in that - if there are more than two electrical conductors, at least one conductor can be connected to a positive conductor ( 36 ) of an electrical voltage source. 6. Locking device according to one of the preceding claims, characterized in that - at the two line ends of the pipe sections ( 16 , 16.2 ) there is an annular plate ( 54 , 64 ) designed as an earthing line, which is countersunk in each case and flush with the inner side ( 26 ) in the pipe section ( 16 ). 7. Locking device according to one of the preceding claims, characterized in that - the electrical conductors ( 34 , 44 , 44.2 ) are provided on the inside of the wall ( 32 ) as a ring plate ( 34 , 44 , 44.2 ), - these ring plates ( 34 , 44 , 44.2 ) are flush with the inner side ( 26 ) of the pipe section ( 16 , 16.2 ) in the wall ( 32 ) of the pipe section in question.