Technical field of the invention

The present invention relates to monitoring equipment in rat traps for positioning in sewers, shafts, and wells.

Background of the invention

Today, monitoring means, such as sensors, are positioned in rat traps for use in sewers and shafts to measure many different conditions. Signals produced by a sensor are relayed above the ground to a sensor monitoring and control unit via cables. However, such a communication system is time consuming to install, and the cables are susceptible to the sometimes very hostile environment within the sewer or shaft. To avoid the latter, very expensive cables are used. However, rodents present in sewers and shafts tend to gnaw in cables, thereby ruining the communication path. Furthermore, the cables are not suitable for drawing through the well or shaft opening and across a road, for obvious reasons.

It is therefore desirable to provide a transmission system that avoids or at least alleviates the above-mentioned problems.

Summary of the invention

A first aspect relates to a wireless transmission system for monitoring equipment in rat traps positioned in sewers, shafts and wells comprising:

- a transmitter unit embedded in a rat trap, and configured for receiving monitoring data from a monitoring equipment embedded within said rat trap, and for transmitting the received monitoring data;

- a wireless repeater or a wireless relay configured for receiving the monitoring data from said monitoring equipment; and

- a receiver unit adapted for being positioned within a range of 0-100 meters from the well or shaft cover, and configured for receiving a monitoring data signal from a monitoring equipment repeated by the wireless repeater and/or the wireless relay.

A second aspect relates to a wireless transmission system for monitoring equipment in rat traps positioned in sewers, shafts and wells comprising:

- a transmitter unit embedded in a rat trap, and configured for receiving monitoring data from a monitoring equipment embedded within said rat trap, and for transmitting the received monitoring data;

- a wireless repeater or a wireless relay configured for receiving the monitoring data from said monitoring equipment;

- positioning means adapted for positioning and/or attaching the wireless repeater or wireless relay 5-100 cm below the well or shaft cover; and

- a receiver unit adapted for being positioned within a range of 0-100 meters from the well or shaft cover, and configured for receiving a monitoring data signal from a monitoring equipment repeated by the wireless repeater and/or the wireless relay.

In the present context, the term "repeater" means a system that receives, amplifies, and re-transmits a wireless signal without extracting the user information or converting the communications protocol. The term "relay" refers to a system that receives, decodes, data regenerates, data transmits, encodes, amplifies, and re-transmits a wireless signal.

The terms "monitoring means" or "monitoring equipment" should be understood very broadly in this context. However, some monitoring means or monitoring equipment are given preference, such as sensors, and flowmeters, e.g. a rat kill monitoring means e.g. embodied as a shock sensor, or a motion sensor.

In one or more embodiments, the transmission system comprises positioning means adapted for positioning and/or attaching the wireless repeater or wireless relay 5-100 cm below the well or shaft cover, such as within the range of 10-95 cm, e.g. within the range of 15-90 cm, such as within the range of 20-85 cm, e.g. within the range of 25-80 cm, such as within the range of 30-75 cm, e.g. within the range of 35-70 cm, such as within the range of 40-65 cm, e.g. within the range of 45-60 cm. This position is important to avoid shielding from the well or shaft cover that is often made of metal. Furthermore, the surrounding soil layer around the well or shaft must not be too thick in order for the emitted signal to pass through. This is why the transmission system cannot work without the wireless repeater or wireless relay, as the emitted signal from the transmitter unit, positioned in close relation to the monitoring equipment within the sewer or on the bottom of the well or shaft, cannot penetrate the surrounding soil layer around the well or shaft; and the well or shaft cover will block the remaining signal. In one or more embodiments, the transmission system comprises a receiver unit adapted for being positioned and/or attached within a range of 0-100 meters from the well or shaft cover, such as within the range of 1 -95 meters, e.g. within the range of 2-90 meters, such as within the range of 3-85 meters, e.g. within the range of 4-80 meters, such as within the range of 5-85 meters, e.g. within the range of 10-70 meters, such as within the range of 15-65 meters, e.g. within the range of 20-60 meters, such as within the range of 25-55 meters, e.g. within the range of 30-50 meters, such as within the range of 35-45 meters. Often the well is positioned below a road, and hence, the receiver unit cannot be blocking the road. Thus, the receiver unit should be configured to receive the signal from the wireless repeater or wireless relay at a distance from the well cover. On the other hand, it is preferred that the battery life of the repeater or wireless relay is as long as possible to reduce underground service. Hence, the receiver unit should be positioned as close as possible to the well cover to avoid spending too much energy on transmission from the repeater or wireless relay. This leads to an overall energy reduction of the entire system, which increases the battery life of all components. In one or more embodiments, the positioning means comprises an extendable rod with means provided for locking said extendable rod in a determined length wherein the extendable rod further comprises means arranged in both ends of for engaging the side wall of a well.

In one or more embodiments, the transmitter unit is configured for transmitting with a wavelength and frequency that cannot penetrate the water when the transmitter is positioned under water, such as under 10-100 cm of water.

In one or more embodiments, the transmitter unit is configured for transmitting with a wavelength and frequency that is at least partly absorbed in water or in water comprising conducting contaminants, such as salts, and wherein the wireless repeater and/or the receiver unit are configured for measuring the time period between received monitoring data signals. The time period will give an indirect indication on whether the well or shaft is flooded. When flooded, the signal is unable to pass through the water or the contaminated water, as it is poorly conducting, and furthermore may reflect the signal.

In one or more embodiments, wherein when the time period between received monitoring data signals exceeds a predetermined threshold, the wireless repeater and/or the receiver unit are configured for logging an alarm and/or creating and transmitting an alarm signal. This is important, as a time period exceeding e.g. 20 minutes is an indication of a blockage of the sewer, which will cause sewage water to rise and escape the sewage system through any possible opening, such as into e.g. a basement of a household.

The transmission system is particularly useful for rodent traps (especially rat traps), as there is no system available for continuous wireless communication with a trap mounted within a well and sewer system. Cables are not suitable for drawing through the well opening and across a road, for obvious reasons; and the rats will gnaw on the cables. Therefore, some traps are connected via cables to a control box positioned right below the well cover. The control box comprises a GSM module configured for transmitting monitoring data. However, this setup does not provide a stabile communication to a receiver, as the GSM signal is blocked by the cover and the surrounding soil layer around the well.

The monitoring equipment is embedded in a rat trap. Such equipment may monitor the release of the trap, or the presence of a rat in or near the trap. If the killing means in the trap is released by use of pressurized gas, such as carbon dioxide, the monitoring equipment may be a shock sensor, such as a G-sensor.

The transmitter unit is embedded in a rat trap. This configuration will avoid external cabling.

In one or more embodiments, the receiver unit is configured for transmitting the received monitoring data and potential alarm signals to a server at a network location. This configuration will allow for a continuous connection with the monitoring equipment. The signal may be transmitted by e.g. satellite, 4G, 3G, 5G, radio link, GSM, LTE, and/or UMTS.

A third aspect relates to the use of a transmission system according to the present invention for rodent control in sewers or shafts, wherein the wireless repeater or wireless relay is positioned 5-100 cm below a) the well cover of a well in fluid communication with a sewer or b) the shaft cover, and wherein the receiver unit is positioned on the ground within a range of 0-100 meters from said well cover or shaft cover.

In one or more embodiments, the monitoring data comprises information about the activity of the killing means of a rat trap.

In one or more embodiments, the monitoring data comprises information about the presence of rats within the sewer, well or shaft.

In one or more embodiments, the wireless repeater and/or the wireless relay and/or the transmitter unit and/or the receiver unit are configured to emit an ON/OFF synchronizing signal. Synchronization of the different units reduces the energy consumption, and the battery within the different units will last longer. This is important, as the service frequency of the individual units is thereby also reduced. In one or more embodiments, the wireless repeater and/or the wireless relay is configured to ON/OFF synchronize with the transmitter unit.

In one or more embodiments, the transmitter unit is configured to ON/OFF synchronize with the wireless repeater and/or the wireless relay.

In one or more embodiments, the wireless repeater and/or the wireless relay is configured to ON/OFF synchronize with the transmitter unit; and the transmitter unit is configured to ON/OFF synchronize with the wireless repeater and/or the wireless relay.

It should be noted that embodiments and features described in the context of one of the aspects of the present invention also apply to the other aspects of the invention.

Brief description of the figures

Figure 1 shows a transmission system in accordance with various embodiments of the invention; and

Figure 2 shows the positioning means in accordance with various embodiments of the invention. Detailed description of the invention

Referring to Figure 1 , the general scheme of the invention is shown. Figure 1 shows a transmission system for monitoring equipment 10 embedded in a rat trap 30. The transmission system comprises a transmitter unit 100, a wireless repeater or wireless relay 200, positioning means 300, and a receiver unit 400.

The transmitter unit 100 is configured for receiving monitoring data from a monitoring equipment 10 embedded in a rat trap 30, and for transmitting the received monitoring data. The wireless repeater or wireless relay 200 is configured for receiving the monitoring data from the monitoring equipment 10. The positioning means 300 is adapted for positioning the wireless repeater or wireless relay 200 at a position below the well cover 20, preferably 5-100 cm below the well cover 20. The receiver unit 400 is adapted for being positioned within a range of 0-100 meters from the well or shaft cover 20, and configured for receiving a monitoring data signal from a monitoring equipment 10 repeated by the wireless repeater and/or the wireless relay 200. The receiver unit 400 is also configured for transmitting the received monitoring data to a server 500 at a network location.

Figure 2 shows the positioning means 300 in accordance with various

embodiments of the invention. The positioning means 300 comprises an extendable rod 310 with means provided for locking said extendable rod 310 in a determined length. Furthermore, means 312 are arranged in both ends of the extendable rod 310 for engaging the side wall of a well. The positioning means 300 are also adapted as anchoring means for anchoring the rat trap 30 with a wire 32 (Figure 1 ). References

10 Monitoring equipment

20 Well cover

30 Rat trap

32 Wire

40 Well

50 Sewer

100 Transmitter unit

200 Wireless repeater or wireless relay

300 Positioning means

310 Extendable rod

312 Means for engaging the side wall of a well or shaft

400 Receiver unit

500 Server