EP1097275B1

EP1097275B1 - Assembly, to be used within a waste water system, being composed of a receptacle, a removable coating and means to connect the coating to the receptacle

Info

Publication number: EP1097275B1
Application number: EP99928918A
Authority: EP
Inventors: Fernando Alberto Grazziotin
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-05-28
Filing date: 1999-05-10
Publication date: 2005-11-23
Anticipated expiration: 2019-05-10
Also published as: AR018406A1; DE69928535T2; ATE310857T1; BR9801250A; ES2253896T3; EP1097275A1; BR9801250C1; CN1303455A; WO1999061714A1; UY25531A1; AU4593599A; DE69928535D1

Description

Field of the Invention

The present invention relates to an assembly composed of a receptacle connected to a water waste line, a removable coating coupled to said receptacle and means to couple the coating to the receptacle. The waste products from the water waste line travel through a pipeline into the receptacle. The waste products are retained in the receptacle due to their different density from the water passing through the receptacle. The capture of the waste products minimizes the burden of waste products flowing to a waste removal system. Also, due to the sealing of the receptacle unpleasant smelling gases are minimized and prevented from passing through the waste water system.

Background of the Invention

Present grease trap systems receive wastewater from an outlet pipe and retain heavier particles due to settling and lighter particles by flotation. The grease portion contained in the water floats on the surface of the water and is retained in the trap. Retention of the waste particles other than water minimizes the chances of clogging of the pipelines of a wastewater removal system.

Most systems make use of a removable trap which once filled is disconnected from the inlet and outlet pipes and is entirely removed. The removed trap is either replaced with a new trap or the old trap is removed, cleaned and replaced in its original position.

Other waste water systems fail to include a trap and are therefore subjected to the presence of foul smelling gases. These devices retain elements that are lighter than water and only retain particles denser than water through settling, time permitting.

With use in combination with sinks or toilets for example, traps are sometimes installed by bending of a pipeline of an outlet. These types of traps prevent passage of gases but, however, require extensive maintenance for removal of particles denser than water.

In addition, commercial products are sold which are capable of partially dissolving grease and other waste products, for example. These commercial products are poured down a drain with the expectation of removal of particles denser than water. However, the requirement for complete removal of particles denser than water is only postponed due to the only partial removal of denser than water particles from the drainage system. Over time these particles build up and will eventually clog a drain.

Therefore, it appears that in all prior known embodiments, the cleaning of some type of trap for particles denser than water or those that float on water can only be postponed. Eventually, cleaning of the container trapping particles having a different density than water must ultimately be performed.

As this task is distasteful to homeowners professionals ultimately must carry it out. Even for professionals, the task of cleaning the trapping container is difficult and takes considerable time. The removal of liquids or particles having a density different than water requires the operator to wear gloves and the use of various tools. If the level of liquid is low, even with the use of tools makes such a task unpleasant and difficult.

In environments where sand is present, such as at the beach, the cleaning of the traps is not only difficult, but is required to be performed quite often due to the accumulating presence of sand. Over time, these systems also fail.

Attempts have been made to use removable screens and/or receptacles placed in the containers. These alternatives only facilitate the removal of part of the particles having a different density from water. They do not solve the problem of requiring a complete cleaning of the entrapping container.

US Patent A-4419232 granted to Oscar S. Artntyr et al. discloses a "FILTERING AND COLLECTING DEVICE FOR WATER DRAINS".

However, the filtering device of the above-mentioned invention is intended for outdoor environments, e.g., outdoor water drains in paved roadways and it does not comprise its own receptacle. It comprises an outer protective grating, located at the pavement level, an holder member adapted to be mounted beneath the drain grating to hold a downwardly depending coarse-filtering wire basket having downwardly depending sides, and a fine-filtering bag made of flexible and water-permeable cloth or fabric material removably disposed around the outside of said holder member, said filter device serving to separate and collect particulate impurities (cf. claim 1).

On the other hand, the filtering device of the above-mentioned US patent is made of a water permeable material and therefore it only partially retains the flowing grease and oily materials flowing in the water. Accordingly, part of said material still passes through the filtering device and will stick to the drain walls and bottom with the result that the removal or emptying of the filter bag does not solve the problem of that material accumulated at the walls and bottom of the drain, which must still be cleaned up from time to time.

Focusing on the current situation, the goal of the present invention is to solve the problems of the prior art in an attempt to answer the following questions:

1. How to clean the dirt receptacles without touching the dirt?

2. How to minimize the discomfort caused to people so as to promote a more frequent maintenance of the boxes, avoiding putrefaction and formation of uncomfortable bad smelling gases?

3. How to make easier the removing of the dirt glued to the bottom and walls of the receptacle, sometimes difficult to reach as it happens with a non-removable siphon?

Summary of the Invention

The object of the present invention is to allow the cleaning of a waste receptacle.

A complete cleaning of a receptacle is achieved by the use of a removable coating, which removes all dirt and avoids contact of the dirt with the receptacle at all times. Therefore the cleanup of the receptacle is quick, easy and simple.

The coating may be made of polyethylene. The coating has suffcient elasticity and flexibility to allow accommodation of an internal shape of the receptacle while being water tight and fitting around the outlet and inlet.

The coating is preformed to allow for a perfect lining of the entire receptacle. The removable coating has the possibility of accommodating multiple openings for connection with one or more inlet pipes and one or more outlet pipes. The coating includes a series of prefabricated portions, which may be weakened and removed to selectively accommodate multiple inlets and/or outlets. Only the desired portion of a desired inlet or outlet is removed from the coating to accommodate a friction fit with an exterior surface of the inlet or outlet pipe to the receptacle. Alternatively, a compressive force is exerted on the coating between a pipe and a coupling portion to hold the coating in its place.

The present invention provides an assembly comprised by a receptacle and an impermeable coating that retains all the materials flowing in the water, making quite easy the removal or cleaning of the coating.

The assembly of the present invention comprises three main parts:

1) A receptacle prepared to receive a coating for collection of dirt;

2) A coating to collect the dirt that if continues flowing inside the pipes can clog them due to decantation and/or floatation;

3) Connection means to connect the coating to the receptacle in order to minimize the flow of liquids and stench gases that can pass through the joints.

The usual receptacle of dirt that receives the waste waters is changed into a model designed to have a coating, i.e., a receptacle that collects dirt, connected in its interior through connection means that connect the coating around its external or inter surfaces at the ends of entrances and exit to a receptacle to collect dirt that can be a whole or divisible shaped to allow the accommodation of the receptacle.

In the state of the art, receptacles of multiple inlets pose a problem due to their many possibilities of use. When one does not know beforehand which inlets will be used, the external ends of the inlets that are likely to be used are open and the internal ends are closed. This situation creates some difficulty for the opening of the inlets that will be used, since it requires the use, not only of a saw, but also other tools, such as drills, rasps, files, and alike.

In order to ease the job of plumbers, the design of the receptacle was changed: the internal ends of the inlets of the receptacle are open and their external ends are closed; the thickness of the wall in the place designed for sectioning is preferably reduced in order to facilitate its opening with cutting tools so as to reduce cross-section and to direct it perpendicularly; the tool to be used, then, may be the same saw used to cut the pipes.

Moreover, the internal ends of the devices are to be protected by movable caps so as to prevent the excessive entering of the pipes where waters will flow and to protect against other damages, such as excessive paste and abrasion marks. The caps will close unused inlets internally and will be removed from the inlets to be used.

In the devices of the prior the art the diameter of the receptacle inlets is the same as the diameter of the pipes, and said inlets are closed internally. This is an obstacle for the proper fitting of the coating because it implies a reduction of the section of passage of waters at the inlets.

In order to improve the receptacle and maintain inlets closed internally and not externally, the solution found was to supply the receptacle with a connection device only in the outlet, leaving to the plumbers the option of placing the devices-for-connection in the inlets. In this case, the diameter of the inlets will be larger than the diameter of the respective pipes through which waters will flow; their diameter is to be large enough to enable the fitting of the corresponding coating and pipes connection devices.

In the state of the art, only the type of receptacles used in outlets of lavatories can be sectioned. In the case of grease-boxes and similar, the receptacle is fixed, which makes its cleaning much more difficult. Besides, the receptacle is a whole watertight unit in order to avoid leakage.

The solution found to make cleaning easier and to preserve tightness, which is already guaranteed by the coating, is to use a removable coating in addition to the sectioning of the receptacle. As a result, the part comprising the coating connection devices is fixed and the remaining parts are made movable. Thus, the receptacle may be removed almost entirely, giving support to the coating even when it is displaced for replacement. The coating is connected in the fixed parts and the movable part is placed to give support to the coating. In this case, the receptacle may be located in a high position to allow that the removal with the coating filled with dirty waters is done from below. Vertically, below the points for connection, the coating is preferably larger than the receptacle-for-dirt. This enable the receptacle to be lowered before the coating is disconnected.

Still in drain boxes the receptacle may have a water displacer for those waters flowing from the top, which should be located at a given distance but not far from the coating connection devices. This given distance will avoid the need for coatings of different sizes; and not far so that, after the upper edge of the coating is placed between the walls of the receptacle and the displacer, it stays there, at a higher level than the flow of waters.

As we could notice, among other problems, in the prior art the dirty waters have direct contact with the receptacle, so that, besides part of the dirt to be deposited on the bottom and the other part is floating, still other part sticks to the walls of the receptacle. The problem of removing all the dirty water from the bottom to the top and to remove the dirt stuck to the walls is both difficult and disgusting, requires a considerable amount of cleaning products and, even so, it is very difficult bleach. Due to these difficulties, there is a tendency for postponing the cleaning, thus increasing the problems, mainly with the inconveniences of the rotting.

To solve the above-mentioned problems the present invention provides a removable coating, a receptacle to receive the dirt that flow in piping or come from the surface to interrupt their way for decantation and/or for flotation. Said receptacle may have the form of a sack or curved tube, in elastic or flexible material, polyethylene film, for example, so that in the first case (a sack) the connection is accomplished by pressuring its holes against the surface of the connector-for-connection-of-coating-around-its-external-surface or around the external surface of the intermediate-connector-for-connection-of-coating, and in the second (a curved tube) the pressure of the liquid and dirt will adapt to the shape of the receptacle; besides, they are both, useful as stanching between connector-for-connection-of coating-in-its-internal-part and the respective intermediate-connector-for-connection-of-coating. Still, the coating is provided with areas for fitting it in the receptacle through connection means.

Together with the creation of the coating for receptacle of dirt there is also the problem that in receptacle of multiple entrances most times it is not possible to anticipate which one will be used, specially when the intended areas of coupling/fitting are simply holes, resulting in the need of a different coating for each combination of connections.

In order to solve this problem the coating has two films in the areas designed for connection: one of the films has perforations in the areas designed for connection, and the other film, less resistant, is glued on it around and above its holes in order to isolate them. In the connection places the thinner film is easily broken open with no need for auxiliary tools.

Another alternative created is to provide coating with projections in the areas designed for connection, preferably, in cylindrical form or cone log, closed in the external extremity. In the connection places the coating is cut in the projections and thus ready for fitting. An improvement of this solution is a less thickness of the projection walls, so that there will be no need of auxiliary instruments.

The coating may be in the form of a siphon to function as trap due to the curvature (26) between the entrance and the exit, so that there is no need for a trap.

The coating can be also supplied with a siphon.

Since in some cases the removal of the coating is difficult and may cause damages, the coating, when filled with liquids, will be narrower in its lower part, in order to facilitate its removal from the bottom up; this can be obtained by folding the coating to form six edges, that is, two folds in the central region, and another two folds in each end, before gluing them and closing the lower part.

In the case of drain-boxes where it is intended that the coating is higher, i.e., far from the connection devices, it may be necessary to fix the upper edge of the coating to the walls of the dirt receptacle. An adhesive belt with enough flexibility to allow that itfunctions as a ring may be used to adhere, not only to the coating but, optionally, to the box.

In the state of the art, the receptacles of dirt are not appropriately prepared to receive a removable coating. To solve this problem the present invention provides connections means to connect the removable coating to the receptacle.

These connection means consist of coupling/fitting. means to connect the coating to the receptacle to minimize the passage of liquids and stinky gases through the joints in the entrance(s) and exit. The connection means have a diameter, in the place where the coating is inserted, larger than the diameter of the corresponding area of the coating foreseen for fitting, because the fitting of the coating is done around the external surface of the connection means.

This is so, because, in case the connection of the coating is done around the external surface of the connection means, the sealing between the coating and the device will be a result of the pressure that the elastic and flexible coating will exert in a given area of the connection means, as a result of the forced increase in the diameters of the corresponding part designed to pressure the area of the coating connection. If the coating connection is in the internal part of the connection means, the sealing will happen as a result of the compression of the coating between the connection means and the intermediary part of the connection means.

Using the intermediary part of the connection means, the first step is to insert coating around its external surface up to before the larger diameter of the extremity. This intermediate-connector presents an end that will be inserted in the internal part of the coating connection means. The external diameter of this end is slightly smaller than the internal diameter of the internal connection device to which it will be connected. In other words, the thickness of the coating times two, plus the diameter, equals a dimension smaller than the diameter of the internal-device, so that the parts have clearance and the insertion is easy; next, the external diameters of the intermediary-device increase gradually until they match the internal diameter of the internal connection device; this happens because, when the intermediary-device is inserted already connected to the coating, this latter is subjected to compression between the two devices, and, since it is made of a flexible and elastic material, it accommodates under pressure, functioning as a sealant.

The external surface of both the device for external connection and the intermediary device have an increased diameter in the end attached to the coating to prevent it from breaking loose, and in the case of the device for external connection, it also facilitates the fitting of the coating in the moment of its placement, when the increase of the diameter of the hole foreseen for connection is provoked.

In the case of the intermediary connection means the increase of the diameter of the hole of the coating, in the area foreseen for connection, can be made using a tool with the same shape of that for the intermediary connection means, but with a reduced size in the cylindrical part, larger at the end of larger diameter and with the end of smaller diameter continued in form of stalk of cone and shut, to proceed to put the tool inside the intermediary connection means, which however, is positioned in the fitting hole of the coating and moves the coating for the conical stalk area of the tool up to the hole increases of diameter and passes for the intermediary connection means, positioning the coating close to the end of larger diameter, resulting in that the coating is prepared to be connected in the internal part of the connection means.

In order for a good sealing to be obtained via coating between the internal connection device and the intermediary connection device, without damaging the coating, it is important that the place where the internal connection device meets the intermediary connection device is such that all points closer to the center are within the same circumference whose center coincides with the axis of the device in any perpendicular section that passes through the center of the device; this will allow the pressure on the part of the coating that works as a sealant to be uniform. From its end to its center, the internal connection device presents internal diameters larger in its initial segment; the diameters gradually reduce up to a segment of constant diameter; this will facilitate the entering of the intermediary connection device already connected to the coating, and the part of the coating working as a sealant will not be sectioned due to pressure being exerted on a very reduced area.

The external diameter of the coating external connection means does not need to be constant in the end of the larger diameter and may have a projection that further facilitates the fixing of the connection point of the coating when its diameter is increased, facilitating that the connection can be done, for example, only with one hand.

Still in relation to the external surface of the coating connection means, regarding places where a connection that supports larger pressure of water is desired, after the connection of the coating to the connectors, rings of elastic materials, as rubber, may be used in the part of the coating fitting to the connector in order to tighten the connection.

When necessary, the siphon (11) will be, preferably, disposable, and in the case of the coating is inserted in the external surface of the coating connection means, the siphon can be inserted soon after the fixing of the coating, without contacting it, directly in the internal part of the connection means, and if the coating is intended to be fitted at the exit of the internal part of the coating connection means, it is necessary that the siphon possesses the same characteristics of the coating connection means, so that it can already be supplied coupled to the coating, as a whole.

The internal part of the coating connection means should foresee that the area suitable to the coupling of the intermediary connector, or of the siphon, is prevented to be invaded by a tube of entrance/exit or eventual glue excess; this can be done using a cap over at the area or internal projection to be protected.

Besides, in order to prevent reduction in its discharge cross-section, the diameters of the internal part of the connection means in the inlets have to be such as to allow the connection of the intermediary part of the connection means with an internal diameter larger or similar to the smallest diameter of the inlet pipe.

For receptacles that receive waters from the top, in order to avoid the entrance of waters between the border of the coating and the walls of the receptacle, a displacer of waters (18) was created consisting in a central passage with a slope towards its center. The displacer of waters may be either part of the receptacle, if an exact height of the coating is estimated, or it may be also part of the receptacle extension and, still, part of the base as a support for the grate. In the base it may serve as a support for a movable displacer (17).

The movable displacer will be suitable to move the waters to a more central point of the receptacle, and thus, the inclination of the displacer and its support are the same and aim at the non-detachment of the drops that pass between the two displacers before reaching the more central part. Besides, its smallest diameter must be smaller than the smallest diameter of its support, and the other end has to rest completely on the fixed displacer. The movable displacer may also become a strainer when closed and has small holes in its central part to retain the more solid dirt that pass through the grate.

In case of impermeability of floors that might enter in the receptacle, or in case of a projection of it, it is important for the displacer of waters to be located below the area of impermeability in order to avoid infiltration in the surroundings of the coating.

In some cases the displacer of waters can still serve to fix the edges of the coating close to the walls of the receptacle.

With the purpose of disposing the liquid part and the remaining of the dirt in different ways, mainly in boxes where greases and larger amount of liquid is present, another accessory, a strainer in format of coating of the receptacle was created, with small holes out of the connection points, below the entrances and exit, the size of the holes being such that determine the retention of the thickest parts of the dirt and allow the passage to the liquid.

The system of removal the coating varies according to the type of receptacle of dirt; to facilitate the retreat minimizing the risks of breaking the coating or the receptacle of dirt can be fixed and whole and the coating is removed from the bottom to the top, or when required or more convenient, it can be removed from top to bottom. It is enough for this, that the receptacle of dirt is totally or partially movable. This is possible because the receptacle is designed not to contact directly the dirt; it works only as support for the coating, which works as receptacle; it has not to be totally hermetic and may be separable. For the same reason, the coating 7 may be removed horizontally, if the receptacle is opened laterally; such flexibility allows, for example, the use of passage-boxes built in walls, or even inside closets, counters, cabinets, etc., and that they have small wheels in case of very big and/or heavy boxes, so that they can be moved elsewhere for maintenance to be carried out in a service area instead of, for example, in a kitchen.

The advantages of the invention regarding the state of the art, besides solving the problems related to it, are still as follows:

a) it promotes the cleaning of the receptacles of dirt without direct contact with them; the points that recommended to be cleaned will be only the edges of the coating connection means and the siphon contact/coupling points, that is, much smaller areas than the total area in contact with the dirt in the receptacles of the prior art.

b) as there is no direct contact with the dirt, which in some cases are not even visualized when non transparent coating is used, the repulse of handling of receptacles of dirt decreases, promoting a more frequent maintenance, also avoiding the rotting and formation of gases, and the resulting unpleasant smells;

c) it avoids the direct contact of the dirt with the receptacle, thus preventing the dirt to adhere to the receptacle;

d) when a siphon is needed, it can be disposable like the coating and therefore it does not need to be cleaned; besides, as it is disposable it is removed and does not disturb the change of the coating, and allows the use of a siphon made low cost recycled material, less resistant and less durable, since any damage made to it during the maintenance is irrelevant;

e) due to the coating removal of the dirt there is no need of large mugs, cloths, not even will need gloves;

f) it allows different shapes of receptacles of dirt and its locations, since they do no longer need to be hermetic and may be separable and movable around;

g) it allows the use of double coating, so that additional coating, disposable or not, pick up dirt in the case of eventual connection fails or same negligence during the coating change; it also allows multiple coatings, which can be removed one by one until the last one is remove and replaced by a new one, in which case, if the siphon were disposable, could be replaced in removal or just in the last;

h) it allows the use of a recipient to separate just the solid dirt inside the coating, which works as strainer; after coupling the tight coating, other coating is coupled, this one with several holes; at the cleaning moment removing first the coating having several holes, the particulate material with a size larger than the holes will be removed, just remaining inside the tight coating the most liquid part; this facilitates several destinies to each one; for example, the solid part could be thrown in the basket of organic garbage, while the liquid part could be emptied, through one of the holes previously connected to the receptacle of dirt, on the ground or in another point of the sewer net and after the change of the coating, to return in the same place;

i) if receptacles of dirt with entrances shut externally are used, the plumber's work is quite simplified for the opening of the entrances where pipes will be connected, because it is enough to saw in the external extremity of the connectors of connection, in the narrowing point, with the same instrument used for cutting the pipes to be connected therein;

j) it facilitates the hermetic closing of the dirt inside the passage boxes connected to lavatories or kitchens, because it is possible to close the coating in its upper part;

k) As the dirt is removed by the removal of the coating, the use of cleaning material, such as detergents, disinfectants, etc.... is minimized and as the removed dirt is composed of organic material, which is disposed off appropriately, it favors environment cares;

l) Given the easy removal of dirt, which will result in more frequent maintenance, it will not be necessary to take so much care not to pour dirt down kitchen sinks at homes and restaurants, for example, allowing for the optimization of time spent in washing dishes, pans, etc.

m) it allows that the movable part of the divisible receptacle is replaced in case of damage, or to change the model, material type, color, etc;

In sum the invention presents the creation of an assembly that can facilitate the plumbers task of opening the entrances in the receptacles of dirt, at the construction or remodeling time, as also and mainly, the periodic work of maintenance, cleaning of the receptacles, because the receptacle of dirt of the prior art may be partially replace by the coating and the dirt recipient, which no longer receives the dirt and becomes the support for the removable coating.

The enclosed drawings relate to a preferred embodiment of the present invention:

Fig. 1 shows, in a passage box with a coupled coating, a front view of a vertical cutting made in Fig. 2,

Fig. 2 shows the upper view of a horizontal cutting made in Fig. 1;

Fig. 3 shows a front view of the coating before the placement in the passage box of Figs. 1 and 2;

Fig. 4 shows a horizontal cutting in the coating showed in Fig. 3,

Fig. 5 shows a vertical cutting in the coating showed in Fig. 3;

Figs. 6 to 10 show other coating alternatives for the passage box showed in Figs. 1 to 5;

Fig. 11 shows an alternative coating for those cases where there is only an entrance and an exit, both in the same direction, side by side; in this case the coating has an entrance hole and an exit hole, without any other opening. The receptacle of dirt should be partially separable and the format of its internal volume allows total support of the coating in its walls, in order to avoid rupture or leaks in weak points of the coating due to pressure. The shape of the coating, together with the receptacle of dirt that accommodates it, results in closed water that works as siphon.

Figs. 12 and 13 show a passage box whose main block was molded with shut entrances and open exit, all with larger diameter, to receive connectors for coating connection; in this case the exit coating connection means would have been placed before supplying the box to the user, while the entrance coating connection means would have been placed in agreement with the user's need according to the case, using only one of five possibilities, the other four remaining shut;

Fig. 14 shows an enlarged view of a fitting area of a receptacle of dirt, with two coupled coatings, one connected in the external surface of the connection means and another connected between internal part of the connection means and the intermediary part of the connection means.

Referring to the drawings, Figures 1 to 5 show an alternative with projections (21 ) in the coating (7), in the areas of connection of the receptacle (1); these projections (21) have thinner walls (6) in their contour, which, besides facilitating the cutting with scissors or other instrument, also allows, due to the weakening provoked by the narrowing, that the rupture is made, besides, carefully, for stretching, manually without the use of any instrument.

Referring to Figures 6 to 10 there is shown another coating alternative, that is, coating (7) is made of two sheets, one of larger thickness (27) with holes (5) in the places where the receptacle of dirt can fit, the other one of smaller thickness (23), a fifth, for example inside the sheet of larger thickness (27), so that it can be broken manually without affecting the thickest sheet (27), agglutinated one each other in vertical lines (25) between the holes (5), isolating them; in this case the fitting can be made without breaking the sheet of smaller thickness, but it must be broken in the places where there are entrance and exit pipes of the receptacle of dirt;

According to the Figures of the present invention, the dirt receptacle (1) is provided in its interior with connector devices (2) that consist of an internal projection in the entrances and exit, which end (20) could have or not, an increased external diameter. The increase in the external diameter need not to be necessarily continuous; for example, it may be only from the inferior half to down or with abrupt projection, for the placement of the coating with only one hand; it imports the easiness of placement of the coating mainly and the seizing to avoid accidental uncoupling.

When the external surface of the connection means is not used and the coating is accompanied of intermediary connection means to be connected in its internal part, it can be released, because the internal progress of the connectors for connection in the entrances and exit of the box, could just remain the necessary to maintain the end of each one perpendicular to its axis.

The coating (7) should be of material that presents flexibility, to adjust to the form of the receptacle (1), and elasticity, for joining, with pressure of the coating in its holes (5), in the connector devices (2). The polyethylene sheets used in the making of packs, "plastic sacks for garbage", for example, assist to theses requirements. Besides, in order to obtain a good accommodation of the coating (7) in the receptacle of dirt (1), that serves as support, the coating in polyethylene sheet (7) should be of bigger dimensions to the internal dimensions of the receptacle (1).

For some applications of the coating (7), in the inferior part, the narrowing is recommended, provoked by the closing (8) with folds (19) to facilitate the retreat for between the devices connectors (2) and in the superior opening of the receptacle.

The coating (7) may be simple, with holes in the places where it is previously known that the connection will be made. Instead, it may also be prepared for breaking in the connection places (6) or still doubled, with holes in the external sheet (27), more resistant, and without in the intern (23), to hinder, even so, weaker, a fifth of the thickness of the other, for example, for being easily broken without damaging the main (27), when necessary for connection. In this last case it is necessary that the two sheets are agglutinated (25) to each other, between the holes (5), isolating them, to preserve the tightness in the holes (5) where there is no connection.

A way to prepare the coating so that it is weak, for breaking in the points where connection is needed, is fastening it around the places that will be marked, in a support base with holes in said points, being followed with the forced stretching, from the walls of the sheet that are in the place of the holes, for displacement, preferably, of cylinders with a less external diameter than the inside diameter of the holes. The purpose is with the forced displacement, the point of elasticity is surpassed being proceeded to before the point of breaking of the sheets, so that it happens the narrowing of the same ones, in definitive deformation, forming projections shaped as cone stalks. The space between the diameter of the hole of the support base and the external diameter of the cylinder defines the parts that will suffer deformation, defining the as of displacement in relation to the used material.

For coatings with two sheets, the holes are made in the most resistant sheet (27); later joins with the weakest sheet (23), gluing them in vertical lines (25) between the holes (5), optionally also above and below them in horizontal lines and in points of the lateral extremities, for they are not free; in the sequence, it is joined the opposed lateral ends in order that the thinnest sheet (23) is in the internal part; next, they are agglutinated, the sheets making a tubular closing; soon after, if necessary, the folds are made (19) to provoke the narrowing of the base (8); finally, the sheets are glued in the base (8) and, in case of continuous sheets, the cutting is done to separate the units of coating.

The preferred embodiment of the invention is as follows:

Preferably the receptacle of dirt will be molded with the entrances closed externally, to facilitate the plumber's work.

Preferably the receptacle will be provided with coating connections means around its external surface and coating connections means in its internal part, except in those cases where the receptacle has a reduced diameter, in which case it will be preferred to provide coating connection means in its internal part.

For receptacles of dirt receiving waters from the top, a displacer of waters will be provided in their upper region.

Regarding the coating connection means, the best alternative is to provide the coating connection means in its internal part, together with intermediary coating connection means, because it offers better stanch and they do not use the internal space of the receptacle. However, in receptacles having enough internal space, it will be better to add coating connection means around its external surface, as it allows the simultaneous use of additional coating. The first coating may be in a more resistant washable and re-usable material, having the internal shape of the receptacle, giving a warranty against fails, while the coating that will receive the dirt may be in disposable material.

In a preferred embodiment the coating (7) may be made of a double sheet glued to each other. The external sheet (27) is more resistant and provided with connection holes (5) the internal one (23) being thinner and located between the holes of the most resistant, isolating them. The thinnest sheet breaks up easily in the connection locations .

If it is desired to separate the solid dirt of the remaining liquid, a strainer with coating form may be fitted after the coating, so that when the coating is removed, it takes together the solid dirt, and the remaining liquid may directed to the exit before the total removal of the coating.

In those cases where the grade is the only entrance of waters, besides using of the removable coating it is preferred to join a fixed displacer of waters (18) sloping to the center, close to the inferior part of the base (15) to support the grate (13) and over it a movable strainer. Thus, the waters enter through the grate, move to the most central area of the receptacle, standing back of the upper edge of the coating and facilitating the periodic removal of the thickest dirt that retained in the strainer.

Claims

Assembly to be used within a waste water system in ombination with sinks, toilets and other installations, the assembly being composed of a receptacle (1) for collection of dirt, a removable coating (7) coupled to the receptacle (1) and means (2) to connect the coating to the receptacle (1) whereby in use all the waste water passes through said coating (7).
characterized in that the receptacle (1) has one or more waste water inlets and one outlet (3); the removable coating (7) is from a material endowed with elasticity and flexibility, and with a format that allows it, in use, to assume the internal form of the receptacle (1); and in that the coating is provided with one or more openings (5) with peripheral edges being able to removably secure to both said receptacle inlets and the receptacle outlet (3).
Assembly according to claim 1, characterized in that the means for the connection (2) of the removable coating (7) in the receptacle (1) of dirt has a diameter, in the place where the coating is fitted, larger than the smallest diameter of the respective foreseen area (5) for fitting of the coating.
Assembly according to claim 1, comprising a fixed displacer (18) for waste water that enters from the top (13) of the receptacle characterized by presenting, in its superior surface, a downward inclination (18) towards to the center of the receptacle (1).
Assembly according to claim 1, characterized in that a movable displacer (17) of the assembly presents a slope with the same inclination of the fixed displacer (18), the movable displacer having e smallest diameter smaller than the diameter of the fixed displacer (18) presenting its supports and the other extremity in dimension that guarantees support in the whole border.
Assembly according to claim 1, characterized in that the coating has double sheet in the possible points of connection (5), where the coating (7) has a first sheet (27) provided with holes (5) in the possible areas of connection and a second sheet (23), less resistant, agglutinated (25) in said first sheet (27), between its holes (5), isolating them.
Assembly according to claim 1, characterized in that the coating is provided with projections (21), in the possible places of connection (5), preferably with a cylindrical shape or a tail of cone shape, and closed in the extremity.
Assembly according to claim 1, characterized in that the coating works as siphon (11), for example, as a result of the curvature (26) between the inlet and the outlet.
Assembly according to claim 1, characterized in that collapsing (8) of the coating (7), in the inferior part, is achieved through folds (19), being two in the central area of the closing portion, and two more in each extremity of the same.
Assembly according to claim 1, characterized in that the coating (7) has a common siphon (11) in the outlet (3).
Assembly according to claim 1, characterized in that the coating (7) presents a smaller thickness of the walls (6) of the projection (21) to facilitate the connection to the inlet(s) and the outlet (3).
Assembly according to claim 1, characterized in that the coating (7) is provided with a filter or a strainer in its interior, between the inlets and the outlet.
Assembly according to claim 1, characterized in that the means (2) for connecting the coating (7) to the receptacle (1) by connecting the coating around the external surface of the means is provided with an external surface with an increased external diameter in the extremity (20) and, when coupled in the receptacle (1) or being part of it, it is constituted as an internal improvement in the inlets and outlet of the same.
Assembly according to claim 1, characterized in that the coating (7) is provided with entrances with larger diameters than those of the inlet/outlel:
Assembly according to claim 1, characterized in that the receptacle (1) can be divided in parts, so that the part that embraces the inlets and outlet of waste water is fixed and the remaining is mobile.
Assembly according to claim 5, characterized in that the closing of the central part of the mobile displacer (17) with a strainer forms a whole with several holes below and/or in the lateral sides.