The present invention relates to a pipe plug for blocking liquid flow in a pipeline, such as an inlet or outlet pipeline. More specifically, the presently disclosed pipe plug is able to prevent overflow from a discharge / drainage pipe, e.g. a toilet, for example due to heavy rain such as cloudbursts.

Background of invention

In recent years there has been an increase in severe cloudbursts, leading to streets and basements being flooded. Flooding leads in some instances to toilets and drainage pipes being filled by water, thereby causing overflow with contaminated water in for example basements. Toilets are being filled by water due to being connected to sewer tubes, meaning that the water is coming from the sewer tubes. This is not a nice situation for any household and leaves hours of cleaning. In severe instances, the toilet overflow also gives rise to water damages, not only near the toilet, but also further away from the toilet, in particular in all the areas where water is able to pass. Clearly, such situations are not desirable, and definitely worth avoiding. Consequently, there is a need for a device to block a sewer tube.

To date, there exist some solutions to this problem. For example US 300,636 discloses an apparatus comprising a hollow air-tight collapsible ball attached to the end of a rubber pipe, the apparatus being adapted to be inserted in the outlet of a water trap whereby the water trap can be closed by inflating the ball with an air-pump.

Summary of invention

The present disclosure relates to a pipe plug for blocking liquid flow in a pipeline, comprising: an inflatable unit for insertion into the pipeline; a pump unit configured for inflating the inflatable unit; a connecting member for connecting the inflatable unit and the pump unit. I.e. the present disclosure relates to an inflatable pipe plug. The preferred embodiment comprises a pressure sensing unit for indicating the air pressure in the inflatable unit. A pressure sensing unit addresses the problem of how to determine the pressure of the inflatable unit that is typically hidden inside the tube. The pipe plug preferably comprises at least one valve, preferably located near the pump, for releasing air in the inflatable unit. The pump unit together with the valve(s) can thereby control the pressure in the inflatable unit.

The plug can be arranged such that the inflatable unit is placed in a first opening of a pipeline, such as a discharge / drainage pipe or the S-bended pipe of a toilet. Hereafter the inflatable unit can be inflated by means of the pump unit in order to block the pipeline. The pressure in the inflatable unit can be assessed by means of the pressure sensing unit. As it is important that the presently disclosed pipe plug is inflated to a point where the liquid is completely blocked in the pipeline, the presently disclosed pipe plug provides a great advantage by comprising a pressure sensing unit for indicating the pressure in the inflatable unit.

In a preferred embodiment, the inflatable unit is able to be pumped up to 100 times, such as between 10 and 90 times, such as between 20 and 80 times, such as between 30 and 70 times, such as between 40 and 50 times, before the internal pressure in the inflatable unit, or the size thereof, is as desired.

Examples of pressure sensing units that can be used are pressure gauges, like a manometer, which can be analog or digital. However, a more low cost solution is a pressure sensing unit where the pressure can be sensed merely by pressing the unit, for example in the case of a pilot balloon. An advantage of such a solution is that it is low cost and provides a device where the pressure can be assessed in a very easy manner. The inflatable unit is configured to provide a liquid tight seal, such that water, for example coming from the sewer, is not able to pass the inflatable unit when installed and inflated in the pipeline. In other words, after the inflatable unit has been inflated, the inflatable unit is able to withstand an outer pressure from water in the pipe, for example coming from an overflown sewer. The inflatable unit may therefore be manufactured in an elastomeric material, such as rubber, in order to be strong, soft and elastic.

The first opening or a part thereof may comprise a container, such as a toilet bowl but can be any container having an opening which is suitable for being blocked by the inflatable unit. The presently disclosed pipe plug may also be configured and used for blocking the fluid flow, such as gas flow, in a pipeline.

The presently disclosed pipe plug is configured to at least block the liquid flow in a pipeline and can as such be used for various applications. As stated above one application is to prevent overflowing, i.e. blocking sewage water flowing backwards in the drainage tubes after heavy rain. Another application is as a cleaning device. The presently disclosed pipe plug may be used for cleaning a container having at least a first opening. The pipe plug may be used as cleaning device by arranging the inflatable unit in the first opening, such as an S-bend of a toilet; expanding the inflatable unit in order to seal the first opening; applying a cleaning process to the container; contracting the inflatable unit, and removing the inflatable unit from the first opening. The container is preferably a toilet bowl but can be any container having an opening which is adapted to be closed by the inflatable unit. This is also disclosed in more detail in WO

2010/102624 which is incorporated herein in its entirety.

In one embodiment, the cleaning process comprises a step wherein the container is filled with a cleaning agent which may comprise cleaning tablets or a solution of acetic acid. Cleaning of a toilet is thereby easily accomplished. The time needed by the operator is short since the operator only needs to position the inflatable unit in the toilet drain and fill the toilet bowl with the cleaning agent, an operation which may take less than 5 minutes for the experienced user. Afterwards, the cleaning agent is active for a period which is defined by the operator and which may depend on the amount and character of the dirt and impurity in the toilet bowl. Description of drawings

Fig. 1 shows an embodiment of the pipe plug 1 according to the present invention. The pipe plug 1 has an inflatable unit 2 for insertion into a pipeline. A pump unit 9 is configured for inflating the inflatable unit 2 by manual operation. A connecting member in the form of the hose 6 is provided for connecting the inflatable unit 2 and the pump unit 9. The pipe plug 1 also comprises a pressure sensing unit 7 for indicating the air pressure in the inflatable unit. In this embodiment, the pressure sensing unit 7 is a pilot balloon, here shown in a spherical form. The pressure sensing unit 7 is directly connected to the hose 6, in close vicinity to the pump unit 9, so as to allow for easy handling of pumping and pressure sensing. The pipe plug further has a valve unit 8, here a three-port valve connected to the inflatable unit 2, and for contracting the inflatable unit 2. The hose 6 is connected to the valve unit 8 using a clamp 10, such that the clamp 10 is tied is around the hose 6 and a part of the valve unit 8. A coupling 3 is connecting the inflatable unit 2 with the hose 6. The coupling 3 has a wide tube part connected to the inflatable unit 2, and a narrow tube part connected to the hose 6. A clamp 5 is tied around the hose 6 and the narrow tube part. The wide tube part of the coupling 3 is fastened to the inflatable unit 2 using two clamps 4. A movable length indicator 11 is provided around the hose 6. The movable length indicator 11 is translatable along the hose such that a user can determine how far the inflatable unit 2 is inside a pipeline when installed in said pipeline. More the one length indicator 11 can be provided on the hose 6. A fixed length indicator 12 is provided on the hose 6 fixed to the coupling 3 such that it is abutting the inflatable unit 2. The fixed length indicator 12 is formed as a second tube member overlying the hose 6 and can be used to determine the position of the inflatable unit 2 when installed in a pipeline, such as the s- shaped drain of a toilet, where the inflatable unit 2 itself is invisible once installed, but where the fixed length indicator 12 then provides an indication of the position of the inflatable unit 2 inside the pipeline.

Fig. 2 shows an embodiment of the coupling 3 with the wide tube part 13 at the bottom of the figure and the narrow tube part 14 at the top of the figure. The wide tube part 13 has two indentations in the form of grooves 15 for fastening the inflatable unit 2 to the coupling 3 using clamps. Similarly, the narrow tube part 14 has an indentation in the form of groove 16 for fastening the hose 6 to the coupling 3 using a clamp. In some embodiments the indentations in the narrow tube part 14 and/or wide tube part 13 may furthermore have one or more layers of rubber, like a rubber ring, in order to create a better seal to the connecting member and/or the inflatable unit 2. An attachment element 17 in the form of a flat piece of material extends from the top of the coupling 3 with a hole 18 through the material. A string may be tied to the coupling 3 through the hole 18 such that the pipe plug 1 may be released from the pipe after use by pulling the string. Detailed description of the invention

In the following, several features and embodiments of the plug are described in further detail. Pressure sensing unit

In one embodiment of the present invention, the pressure sensing unit comprises a compressible unit. The pressure sensing unit may for example comprise an air filled compressible unit fluidly connected to the inflatable unit, the pipe plug configured such that the air pressure in the inflatable unit is indicated by the air pressure in the compressible unit, e.g. such that the pressure in the compressible unit is substantially proportional to the air pressure in the inflatable unit. The air pressure may be indicated visually, for example by means of a pilot balloon that inflates along with inflation of the inflatable unit. The air pressure may alternatively and/or additionally be assessed non- visually, for example in a balloon that maintains its volume during inflation of the inflatable unit. In this way, the air pressure may be assessed by feeling the pressure of the pilot balloon, for example by pressing with fingers on the balloon.

In a preferred embodiment of the present invention, the pressure sensing unit is a pilot balloon. A pilot balloon is a guide balloon, meaning that it acts as a guide to the pressure in the inflatable unit. By the feel of the pilot balloon, a user of the pipe plug may thereby be guided such that the user can determine the pressure in the inflatable unit. The pressure sensing unit may be capable of being squeezed by hand and/or finger(s).

In one embodiment of the present invention, the pressure sensing unit is attached directly to the connecting member. This may facilitate easy access to the compressible unit, and provide for a simple and low cost device. In a second embodiment of the present invention, the pressure sensing unit is formed as a limited length of the connecting member having a larger cross sectional diameter than the rest of the connecting member. Such a solution may also provide for a simple and low cost device. In some embodiments, the pressure sensing unit is inflatable. In this way, the pressure may for example be indicated visually. The pressure may be indicated directly by the compressible unit being inflatable, or indirectly, for example by pressing upon a mechanical unit that is configured for providing a qualitative measure of the pressure. In other embodiments, the pressure sensing unit is positioned between 1 cm and 20 cm from the pump unit, such as between 2 cm and 10 cm, such as between 3 cm and 7 cm, such as between 4 cm and 6 cm, such as 5 cm from the pump unit. An advantage of this embodiment is that the user may be able to pump up the inflatable unit and easily access the pressure sensing unit. In other words, the embodiment provides a practical device.

The pressure sensing unit may have a spherical form. In relation hereto, the pressure sensing unit may have a maximum diameter between 5 mm and 50 mm, such as between 6 mm and 40 mm, such as between 7 mm and 30 mm, such as between 8 mm and 20 mm, or such as between 9 and 10 mm. These dimensions may be optimal for feeling the pressure of the pressure sensing unit with for example two fingers.

In alternative embodiments, the compressible unit has an elliptical form.

As already described, the pressure sensing unit may be configured for providing a qualitative indication of the internal pressure in the inflatable unit.

Various materials can be used to manufacture the pressure sensing unit, and in most embodiments, the compressible unit is made of latex. This material is typically low cost and provides for an optimal feel of the pressure.

As also stated previously the pressure sensing unit may be some sort of pressure gauge, e.g. a manometer. However, compared to a pilot balloon a pressure gauge is a much more complicated and less cost efficient solution.

Inflatable unit

According to the objective of the present invention, the inflatable unit is in one embodiment dimensioned to block a drainage pipe, such as a drain pipe having a diameter between 20 mm and 150 mm, such as 32 mm, 40 mm, 50 mm, 75 mm, or 1 10 mm.

In preferred embodiments of the present invention, the inflatable unit has a diameter between 20 mm and 150 mm, such as 32 mm, 40 mm, 50 mm, 75 mm, or 1 10 mm. Using these dimensions, may provide for optimal blocking of pipes. Many types and pipe diameters of drainage pipes and toilets exist and the inflatable unit of the presently disclosed pipe plug may come in many sizes, such that a user can select the appropriate size inflatable unit to the specific application with the specific pipeline having a specific diameter in his home / building. In a most preferred embodiment, the pipe plug is configured to withstand an outer liquid (e.g. water) pressure of up to 0.1 bar, more preferably up to 0.2 bar, even more preferably up to 0.3 bar, yet more preferably up to 0.5 bar, yet even more preferably up to 1 bar, most preferably up to 3 bar, when installed in a pipeline and inflated by means of the pump unit. Thereby is provided a device that is able to effectively block rain burst overflow in for example toilets and drain pipes.

In various embodiments of the pipe plug, the inflatable unit comprises a reinforced portion. By such a reinforced portion, an advantage is gained in that the portion of the connection means close to the inflatable unit, and the portion of the inflatable unit close to the connection means, are prevented from developing sharp bends that may act as barriers when the inflatable unit is expanded or contracted. Further, in another embodiment, the pipe plug comprises a valve unit, such as a three-port valve, for controlling the pressure in the inflatable unit. Such a valve unit is advantageous in contracting the expandable member by pressure release.

The inflatable unit may be connected to the connecting member by means of a coupling. Compared to the inflatable unit the coupling is preferably rigid. The coupling 3 may be provided with a wide part connected to the inflatable unit 2, and a narrow tube part connected to the connecting member 6. The narrow tube part and/or the wide tube part of the coupling may be circular in cross section and they may comprise circular indentations. One or more, such as two or more, clamps may then be provided to secure the inflatable part to the wide part of the coupling and/or to secure the connecting member to the narrow part of the coupling. The combination of an inflatable unit in for example rubber or latex and a substantially rigid round coupling, for example manufactured in plastic, with indentations in the rounded edge and clamps, such as cable ties around the indentations, to secure the inflatable unit to the coupling, has turned out to be a low cost solution that is sufficiently strong and airtight to maintain the necessary pressure that the inflatable unit must be able to withstand in the pipeline. The coupling may furthermore have one or more layers of elastomeric material, such as rubber, in at least one, or all, of the indentations in the narrow tube part and/or wide tube part. For example in the form of rings of elastomeric material located in the indentations. The elastomeric layers may help to improve the airtight seal between the coupling and the inflatable unit and/or between the coupling and the connecting member, because elastomeric material is thereby located between the coupling and the inflatable unit. The shore hardness of the elastomeric layers may substantially correspond to the shore hardness of the material of the inflatable unit.

The coupling may furthermore be equipped with at least one attachment element, for example in the form of a hole and/or hook and/or eye, configured for mounting a string, such that the pipe plug can be released after use by pulling the string instead of the connecting member. For the case of an eye in the coupling, this may be a screw eye, an eyebolt or an eye integrated as part of the coupling. In one embodiment, the attachment element may be in form of a flat piece of material extending from the coupling with a hole through the material for attaching a string. Pulling the string attached to the coupling is provided as a safer means for releasing the pipe plug from the pipe after use instead of pulling the hose, as this may become damaged or detached from the coupling.

Connecting member

In one embodiment of the present invention, the connecting member comprises a first tube member, such as a hose. The inflatable unit may thereby easily be inflated for instance by use of air. The tube member may be made of latex. The tube member may have a diameter between 3 mm and 50 mm, such as between 4 mm and 40 mm, such as between 5 and 20 mm. The connecting member is in most embodiments a flexible member. Thereby is provided for a device that is able to be inserted into bended pipes, for example S-shaped pipes.

In a preferred embodiment of the pipe plug, the pipe plug comprises a measuring means, preferably provided on the connecting member. The measuring means comprises a length measuring means. The measuring means can thus be a position means for positioning the inflatable unit. In a related embodiment, the measuring means comprises a length measuring means, such as a ruler having at least one length indicator. The length measuring means may preferably comprise a second tube member extending from the inflatable unit and said second tube member being adapted for engagement with the first tube member as exemplified as the fixed length indicator 12 in fig. 1 . The second tube member may be shorter than the first tube member, and said second tube member may encapsulate a portion of the first tube member. Further, the second tube member may have an end portion being provided at a predetermined lengthwise position on a portion of the first tube member. The predetermined lengthwise position can be used to place the inflatable unit in a correct position, for example when used as a pipe plug or in a cleaning process. The predetermined lengthwise position is useful for instance when the pipe plug is used in a toilet. The inflatable member is thus adapted for precise arrangement in the trap of a toilet, such as a water lock of a toilet, which often is an S-shaped pipe.

Pump unit

In one embodiment of the present invention, the pump unit is attached to the connecting member via a funnel unit, wherein the funnel unit has a wide tube part connected to the pump unit, and a narrow tube part connected to the connecting member. This embodiment provides for an effective pumping of air into the connecting member. The pump unit may be a hand operated plastic or rubber pump unit that can be operated with one hand, i.e. the inflatable unit can be inflated by the user continuously pumping the pump unit with one hand. With the other hand / fingers the user can assess the pressure in the inflatable unit that is inflated inside the pipeline.

In a second embodiment of the present invention, the wide tube part is connected to the pump unit such that a part of the pump unit is covering the wide tube part. In this way a rigid and solid connection may be provided, in particular a connection whereby it is possible to pump air into the connecting member and the inflatable member without breaking. In a most preferred embodiment, the wide tube part is fastened to the pump unit using one or more clip(s) and/or clamp(s). Thereby is provided a device that is properly secured, in particular such that it can withstand high pressures and is able to be used many times.

Cleaning example

The operator may choose if the water standing in a toilet has to be removed or not, to remove the water, the operator may use a toilet brush to push the water past the S- bend of the toilet. The inflatable unit, as may be a deflated balloon, is positioned in the toilet trap in such a way that a reinforced part of the tube extending from the balloon is just visible. The balloon is now inflated by use of the hand pump, which has to be pushed approximately 50 times, until it shuts the toilet drain. If acetic acid is used for cleaning, the following steps are carried out. 1 liter of acetic acid is poured into the toilet bowl followed by water from the tap with a temperature of approximately 40 - 50 'Ό until the toilet bowl is filled up with water. The resulting acetic acid solution is left to work on the calcareous sediments for minimum 30 min. Next, the water is emptied from the toilet bowl by deflating the balloon which is carried out by opening the pressure release valve. The operator needs to retain the balloon from getting flushed out by applying a firm grip on the reinforced part of the tube extending from the balloon or by applying a firm grip of a string attached to the coupling of the pipe plug, e.g. by means of an attachment element on the coupling. When the water has been flushed out the balloon is removed by pulling the reinforced part of the tube extending from the balloon or by pulling the string attached to the coupling. The string may be part of the pipe plug. The toilet bowl can optionally be scoured by a sponge with a cleaning agent. If tablets are used, the following steps are performed. The toilet bowl is filled with water having a temperature of approximately 40 °C whereafter the tablets (preferably 8 tablets) are added. The solution is left alone for 6 hours, for instance overnight. Next, the water is emptied from the toilet bowl in the same way as described above for the case of acetic acid as a cleaning agent.