Method for manufacturing a flush toilet

Abstract

Method for manufacturing a flush toilet (10) with a flush water inlet opening (20) arranged centrally at the rear in a state of use and a flush water discharge device (50) arranged decentrally in a rear area (40) located laterally to an imaginary center line (30) of the flush toilet (10), wherein the method comprises the following steps: - Providing a multi-part porous casting mold for producing a green part (12) of the flush toilet (10), wherein the green part (12) - has a manufacturing access opening (60) that allows access to the decentrally arranged flush water dispensing device (50) from the rear of the flush toilet (10), - has the centrally located flush water inlet opening (20), - has a side channel (80) extending from the rinse water inlet opening (20) towards the manufacturing access opening (60); - Filling the mold with a liquid slip to produce a ceramic sanitary fitting; - Solidifying the slurry by removing liquid through the wall of the porous mold for a period of time sufficient to solidify the slurry to a predetermined thickness on its surface adjacent to the mold; - Draining of unsolidified slip from the green body through openings provided in the mold; - Opening and removing the mold; - Providing at least one fluid communication opening (90) between the production access opening (60) and the side channel (80), in particular in a section of the production access opening (60) adjacent to the rinsing water discharge device (50), and - Closing the production access opening (60) by forming a flushing water channel, so that during operation of the flush toilet (10) flushing water can flow to the flushing water dispensing device (50).

Description

[0001] The invention relates to a method for producing a flush toilet according to claim 1.

[0002] Flush toilets and their manufacturing processes have been known for a long time. A distinction is usually made between flush toilets with a more or less closed rim and rimless toilets. A rim helps guide and distribute flush water and reduces splashing. Without such rims, water distribution is significantly more complex and the risk of splashing is higher because the water must be released more precisely from a water outlet on the toilet bowl side. Therefore, with rimless toilets, the functional requirements and, consequently, the design of a flush water distribution component are significantly more difficult, and such complex components can often no longer be realized using traditional ceramic manufacturing methods alone.Therefore, the state of the art includes additional components made of ceramic and / or plastic or metal that can better reflect the complex geometries of distributor components. However, such components appear like unsightly foreign bodies in rimless toilets and are prone to contamination.

[0003] Furthermore, in certain designs of rimless toilets, there is a splash guard around the bowl, which at least partially defines a water channel upwards and sometimes looks like a kind of reduced “rim”, but has no function in the distribution of flush water, but is only there to prevent splashing.

[0004] There are essentially two variants of their manufacturing process, which differ significantly in terms of the structure of the respective flush toilet. The first option for producing a flush toilet is to first produce two separate molded parts, which are then joined together, i.e. trimmed. The first molded part relates to the actual toilet body, while the second molded part forms the upper surface of the later flush toilet, i.e. the rim / splash guard including the seat. These two parts are cast separately in their own molds, then demolded and finally joined together in the green state with slip, with the slip acting as a ceramic adhesive, so that the two individual molded parts and the slip are combined to form a one-piece flush toilet body after firing. Such processes are described, for example, in JP 2001-279789 A or DE 10 2017 127 190 A1.described.

[0005] Because the upper surface of the flush toilet is manufactured separately and only attached to the lower toilet body at a later stage, the lower toilet body is initially freely accessible from above. This makes it possible to create complex shapes in the still-green toilet body, for example for later water guidance. In a similar way, it is also possible to give the upper surface of the flush toilet a complex design, as this component is initially freely accessible from all sides, i.e. before it is attached to the lower toilet body. In this way, it is possible to create a flush toilet that has complex, three-dimensional flush water channels in the ceramic that is later produced by firing.

[0006] A disadvantage of this manufacturing process for a flush toilet, which involves two or more molded parts that are then trimmed together, is that the production of the individual molded parts is time-consuming and sometimes very complex, as the molded parts must be manufactured in such a way that they fit exactly after trimming and are precisely coordinated with one another, for example for water guidance to avoid any turbulence and flow resistance. Furthermore, a multi-part construction of a flush toilet generally entails a loss of quality. This is due to the fact that the trim seam may be visible after firing, which can also result in any misalignment of the trimmed parts. Furthermore, it is possible that gaps, excess material, cracks or other visually unsightly artifacts may appear at the trim seam.Thus, while such a manufacturing process based on multiple molded parts makes it possible to produce flush toilets with complex geometries and shapes within the ceramic, this is offset by a complex and time-consuming manufacturing process that sometimes leads to unsightly results.

[0007] A second alternative manufacturing process, however, involves producing a flush toilet from a single molded part, with the toilet body and the rim / splash guard of the subsequent, optionally rimless, flush toilet being cast in one piece. This process has the advantage that casting such a flush toilet is a relatively simple operation, which in particular avoids trimming and all associated errors, such as undesirable misalignment of the parts to be joined, cracking, and excess slip. However, it only allows the production of simple geometries, both with regard to the flush toilet body and the rim of the flush toilet. The production of complex flush water distribution paths, which are necessary for the effective flushing of a rimless toilet, is not possible in ceramics using this process.

[0008] To enable complex flush water distribution paths in a toilet body manufactured using this latter process, it is necessary to use additional components, such as ceramic and / or plastic or metal, which is only possible after firing. However, this in turn leads to unsightly and soil-prone fittings in the toilet bowl of the manufactured flush toilet.

[0009] The invention is based on the object of specifying a method for producing a flush toilet and a flush toilet produced by this method, wherein the manufacturing method avoids the above-mentioned disadvantages and leads to a flush toilet which is perfect from an aesthetic point of view, which has flush water distribution paths formed in the ceramic and avoids unsightly fittings in the toilet bowl of the manufactured flush toilet.

[0010] This object is achieved by a method for producing a flush toilet according to patent claim 1.

[0011] In particular, this object is achieved by a method for producing a flush toilet with a flush water inlet opening arranged centrally at the rear in a state of use and a flush water dispensing device arranged decentrally in a rear area of ​​the flush toilet located to the side of an imaginary center line, the method comprising the following steps: - Providing a multi-part porous casting mold for producing a green body (12) of the flush toilet (10), wherein the green body (12) - a manufacturing access opening (60) which allows access to the decentrally arranged flush water dispenser (50) from the rear of the flush toilet (10), - has a centrally arranged flushing water inlet opening (20), - has a side channel (80) extending from the flushing water inlet opening (20) towards the production access opening (60); - Filling the mold with a liquid slip to produce a ceramic sanitary unit; - solidifying the slip by withdrawing liquid through the wall of the porous casting mould for a period of time sufficient to solidify the slip to a predetermined thickness on its surface adjacent to the casting mould; - Draining of unsolidified slip from the green body through openings provided in the casting mould; - Opening and removing the mold; - Producing at least one fluid communication opening (90) between the production access opening (60) and the side channel (80), in particular in a section of the production access opening (60) adjacent to the rinsing water discharge device (50), and - closing the production access opening (60) to form a flushing water channel so that flushing water can flow to the flushing water dispensing device (50) during operation of the flushing toilet (10).

[0012] An essential point of the invention is that a green body for the flush toilet to be produced is first cast in one step using a multi-part porous casting mold, wherein the green body is formed according to the desired flush water distribution, namely in the present case with a centrally arranged flush water inlet opening and a basic structure for a decentrally arranged flush water discharge device.

[0013] A further important point of the invention lies in the fact that it was recognized according to the invention that a complex geometry can be produced within a ceramic by using a porous casting mold into which liquid slip is poured and this slip is solidified along the wall of the porous casting mold by withdrawing liquid through the wall of the porous casting mold to such an extent that the slip solidifies to a certain thickness, while slip which exceeds this thickness, i.e. is at a greater distance from the wall of the mold than the desired thickness, remains liquid and can be removed from the casting mold. For this purpose, openings are provided in the casting mold through which the remaining liquid, or at least unsolidified slip, can be drained off and, if desired, rinsed out.It was recognized according to the invention that it is possible in this way to create cavities in a green body which are initially filled with unsolidified slip, which can then be drained off, so that an empty cavity remains which can be used as a water guide channel when the flush toilet produced according to the invention has been fired.

[0014] For this purpose, the invention further provides that this cavity has, on the one hand, a flushing water inlet opening, while, on the other hand, an opening to be formed serves to form a fluid communication with the flushing water dispensing device.

[0015] According to the invention, these two openings to be formed are produced, in particular exclusively, from the rear of the flush toilet by piercing the flush water inlet opening, or cutting or punching it with a circular knife, for example, and by piercing the opening associated with the fluid communication with the flush water dispensing device through a production access opening arranged at the rear of the flush toilet, or cutting or punching it with a circular knife or a blade.

[0016] The aforementioned cavity extends in the form of a side channel to be formed from the centrally arranged rinsing water inlet opening in the direction of the rinsing water discharge device arranged decentrally in a rear side of an imaginary center line, so that the side channel serves as a connecting channel between the rinsing water inlet opening and the rinsing water discharge device after the unsolidified slurry has been drained off.

[0017] Since the production access opening, through which an opening for enabling fluid communication between the flush water inlet opening and the flush water discharge device was created by means of a tool, namely through the side channel, is open towards the rear of the flush toilet, this production access opening is closed from the rear of the flush toilet, i.e. on the production access opening side, after the flush water discharge device-side end of the side channel has been opened, in order to form the flush water channel from the flush water inlet opening to the flush water discharge device in such a way that it is sealed against the rear of the flush toilet and flush water can flow unhindered from the flush water inlet opening through the side channel to the flush water discharge device.

[0018] In this way, it is possible according to the invention to produce a flush toilet which has a central flush water inlet opening, as is usual in known toilets, so that the flush toilet produced according to the invention can be easily connected to an existing water supply system for toilets.

[0019] Furthermore, the manufacturing method according to the invention makes it possible to produce a flush toilet which, despite the central flush water inlet opening, has a decentrally arranged flush water discharge device, without the need for unsightly fittings in the toilet bowl, as was disadvantageously necessary in the prior art, since, according to the invention, flush water is guided exclusively within the ceramic of the flush toilet manufactured according to the invention and only one or more flush water discharge openings open into the toilet bowl, as desired.

[0020] According to one embodiment of the invention, the closure of the production access opening is carried out with a preferably prefabricated, green-ceramic closure component, which is concavely rounded in particular towards the flushing water channel and which is inserted through the production access opening adjacent to the fluid communication opening into the production access opening and is secured there.

[0021] The use of a prefabricated closure component to close the production access opening is advantageous because the closure component can be precisely manufactured in advance and only needs to be inserted into the production access opening and secured there, so that the flushing water channel is both sealed and smooth, allowing flow without obstructions or turbulence. For this purpose, the closure component can have an optimal concave curve adapted to the flushing water channel, ensuring a smooth transition, i.e., without corners and edges, from the side channel to the closure component and further to the flushing water outlet opening, or flushing water discharge device.

[0022] According to one embodiment, the flushing water dispensing device is advantageously designed such that the flushing water dispensing device has at least one first flushing water outlet opening through which the flushing water can be dispensed in a first initial flushing direction, and furthermore has at least one second flushing water outlet opening through which flushing water can be dispensed in a second initial flushing direction.

[0023] To produce such first and second flushing water outlet openings with a respective desired, defined initial flushing direction, the at least one first flushing water outlet opening and / or the at least one second flushing water outlet opening is / are opened, in particular pierced, before firing the green body and the prefabricated component, namely the closure component. Alternatively, at least one of the flushing water outlet openings, in particular the first flushing water outlet opening, can also be created during the production of the toilet body green body.

[0024] Furthermore, to form the flush water discharge device, a prefabricated, in particular green-ceramic, distributor component can be used, if desired, which has at least one flush water inlet opening and at least two flush water outlet openings for discharging the flush water into the toilet bowl.

[0025] According to the invention, such a distributor component in the form of a prefabricated pre-cast component is placed precisely in the casting mold and cast with slip before the casting mold is filled with slip.

[0026] As mentioned above, a feature of the flush water dispensing device is that the flush water outlet is arranged asymmetrically in the toilet body, so that it is possible to dispense flush water asymmetrically through the flush water outlet with respect to an imaginary center line which extends substantially centrally from a front end of the toilet body facing a user during flushing operation to an opposite rear end of the toilet body.Another important point is that the asymmetrical arrangement of the flush water outlet makes it possible to flush the inside surface of the toilet bowl in such a way that part of the flush water is not directed directly from the flush water outlet towards the siphon, as was previously the case, but is first directed over a side wall on the inside of the toilet bowl, so that a gyratory or circular flow is created, which wets and thus cleans the inside surface of the toilet bowl with flush water better and more completely than with a central location of the flush water outlet on the back of the inside of the toilet bowl.

[0027] Furthermore, the asymmetrical arrangement of the flush water distributor with the respective flush water outlet openings in the toilet body ceramic itself prevents, in an extremely advantageous and at the same time extremely simple manner, the flush water outlet from becoming dirty during use of the toilet produced according to the invention, since the flush water outlet is no longer arranged directly behind a user in the toilet bowl.

[0028] For this purpose, the flush water outlet is arranged according to the invention in a rear lateral area, in particular in a rear lateral corner area, of the toilet bowl, wherein the flush water is discharged tangentially into the toilet bowl in a substantially horizontal direction, rather than downwards. Due to the tangential discharge of the flush water, the flush water circulates in the form of a circular flow within the toilet bowl and overflows a significant portion of the interior surface of the toilet bowl before flowing into the siphon, which serves as an odor trap, and through a drain hole arranged in the siphon, further toward a wastewater pipe.

[0029] The drain hole is located in the lower part of the siphon, i.e., the odor trap, and is limited on the one hand by the curvature of the odor trap and on the other hand by a tongue and / or wall of the toilet body. Visually, the drain hole is the section of the siphon that is perceived by a user standing in front of the toilet when observing the siphon as the area through which the contents draining from the toilet flow from the visible to the invisible area of ​​the siphon.

[0030] Within the scope of this invention, a rear lateral corner region of the toilet bowl is defined as a lateral rear region of the toilet bowl which, depending on the shape of the toilet body, actually represents a corner, possibly a rounded corner of the toilet bowl or a rear region of the toilet bowl which, in the toilet bowl at the level of the first flush water outlet opening, has a distance from the imaginary center line which lies in the range of 40% to 100%, preferably 45% to 100%, and particularly preferably 50% to 100% of a maximum distance of a rear lateral inner surface of the toilet bowl from the imaginary center line. Depending on the shape and design of the toilet bowl, the maximum distance of a rear lateral inner surface of the toilet bowl from the imaginary center line of the toilet bowl can be

[0031] The sides may be different from the centerline. In this context, it should be noted that the flush water outlet is not considered a lateral interior surface of the toilet bowl for the purposes of this definition.

[0032] At this point it should be noted that the rear side wall is to be understood as the area of ​​the toilet bowl in which a tangent drawn to the inner wall of the toilet bowl at the level of the lower limit of the second flush water outlet opening encloses an angle of between 90° and 45° with the imaginary center line. Analogously, within the scope of the invention, the area of ​​a front side wall of the toilet bowl is to be understood as the area of ​​a lateral side wall of the toilet bowl. The area of ​​the toilet bowl in which a tangent drawn to the inner wall of the toilet bowl at the level of the lower limit of the second flush water outlet opening encloses an angle of between less than 45° and 0° with the imaginary center line, where an angle of 0° between the tangent and the imaginary center line denotes a parallel course of the tangent and the imaginary center line.In this context, only the angles between the applied tangent and the imaginary center line, which lie in a range between 0° and 90°, are considered within the scope of this invention. The inner periphery of the toilet bowl is understood to be a line at the level of the lower boundary of the second flush water outlet opening along the inner wall of the toilet bowl, which extends circumferentially along the inner wall of the toilet bowl.

[0033] According to a preferred embodiment of the invention, the flush water outlet, as already mentioned above, comprises at least one first flush water outlet opening through which the flush water can be discharged in a first initial flushing direction, and at least one second flush water outlet opening through which flush water can be discharged in a second initial flushing direction. In this way, it is possible to flush the toilet bowl in the opposite direction, with flush water discharged through the first flush water outlet opening initially being directed along a lateral inner side wall of the toilet bowl, and flush water discharged through the second flush water outlet opening initially flowing along a rear inner side wall of the toilet bowl.The flush water, which is directed along the inner side wall of the toilet bowl, flows from the first flush water outlet opening provided in the flush water dispenser, initially along the side wall of the toilet bowl into a front area of ​​the toilet bowl, then continues as a gyratory or circular flow toward the rear wall of the toilet bowl, and continues until it circles into the odor trap. The water discharged from the second flush water outlet opening is initially directed toward the inner rear wall of the toilet bowl, also in the form of a partial circular or circular flow.

[0034] According to a preferred embodiment, a free cross-section of the first flush water outlet opening is larger than a free cross-section of the second flush water outlet opening, so that a first flush water quantity discharged from the first flush water outlet opening is greater than a second flush water quantity discharged from the second flush water outlet opening. This is particularly advantageous because the first flush water quantity is intended to clean a significantly larger surface area of ​​the inner surface of the toilet bowl, while the second flush water quantity only flushes and cleans the rear inner back wall of the toilet bowl, which is not flooded by the first flush water quantity.

[0035] The water is discharged from the first flush water outlet opening and / or the second flush water outlet opening with an initial flush direction, wherein the first and / or the second initial flush direction, when the flush toilet is in use, extends in a substantially horizontal direction ± 0° to 5° with respect to the horizontal, and the flush water is thus discharged substantially horizontally. Depending on the requirements, the initial flush direction can be directed slightly upwards in order to somewhat counteract a gravitational effect, which inevitably directs the flush water downwards towards the siphon, in order to ensure that the first flush water stream reaches the rear part of the toilet bowl at the highest possible position.

[0036] According to an alternative embodiment of the invention, the initial flushing direction may also be slightly downward, which may be particularly desirable in the case of rimless toilet bowls in order to reliably prevent splashing over the rim.

[0037] According to the invention, the first and second initial flushing directions are aligned at the level of the inner periphery of the toilet bowl at an angle in the range of 30° to 140°, preferably at an angle in the range of 60° to 110°, and particularly preferably at an angle in the range of 75° to 110°.

[0038] In this way, depending on the shape of the toilet, it can be optimally adjusted so that the first flushing water flow is initially discharged tangentially along a lateral inner side wall of the toilet bowl, and that the flushing water discharged through the second flushing water outlet opening initially and also flows tangentially along a rear inner side wall of the toilet bowl.

[0039] According to a further embodiment, one or more steps and / or one or more strips can be provided in the interior, ie on the inner surface, of the toilet bowl, which, optionally in combination, act as water guiding device(s), wherein the flushing water emerging from the first flushing water outlet opening and / or the flushing water emerging from the second flushing water outlet opening is guided along such water guiding devices.

[0040] In this way, the water emerging from the respective flush water outlet openings can, in particular initially, be released into the toilet bowl at a certain, predefined level and maintained at this level, which is predetermined by the water guiding device. The water guiding device(s) provided according to the invention, i.e. in particular the step(s) and / or the strip(s), taper from an end close to the respective flush water outlet opening to an end remote from the respective flush water outlet opening, in particular down to zero. The taper can be designed such that the step or the strip merely becomes narrower, so that the guiding surface for the flush water on the step or the strip decreases with increasing distance from the respective flush water outlet opening.In addition, the taper may initially have an edge directed towards the inside of the toilet bowl, which may be sharp, and which may be increasingly rounded at its inner end facing the inside of the toilet bowl with increasing distance from the respective flush water outlet opening.

[0041] Furthermore, it should be noted in this context that at least one water guiding device formed on the inner surface of the toilet bowl, for example also in the form of a step, can also be formed and defined in that the inner surface of the toilet bowl has a bulge which runs essentially horizontally or, if desired, also slightly inclined, which forms the "step", wherein the bulge has a continuously smooth course with, viewed vertically, two turning points in which an inner contour of the toilet bowl first changes from a concave into a convex shape and then back into a concave shape, which may optionally run convex again in the area of ​​the siphon and opens into the siphon.

[0042] According to a further embodiment of the invention, the "step" can also be formed in that an initially concave inner contour of the toilet bowl, seen in the vertical direction from top to bottom in an upright flush toilet, merges into a convex inner contour of the bowl, which, depending on the embodiment, continues to be convex or straight-conical up to the odor trap of the flush toilet.

[0043] According to the invention, the water guiding device extends to different distances over the inner surface of the toilet bowl with respect to the respective first flush water outlet opening and the second flush water outlet opening.

[0044] According to an alternative embodiment of the invention, it is also possible for the respective water guiding device not to be directly adjacent to a respective associated flushing water outlet opening, but for the flushing water to initially flow "freely" from the respective flushing water outlet opening, namely in the horizontal and / or vertical direction, before being "caught" at a certain, predetermined distance from the flushing water outlet opening and guided into and around the sanitary bowl at a certain level.Such an embodiment inventively enables a bifurcal tangential flush of the toilet bowl, whereby the distance of the water guiding device from the flush water outlet determines how much flush water is to be directed via the water guiding device and how much flush water is to be directed directly into the areas of the toilet bowl below the water guiding device, as well as the angle at which the respective flush water streams are to be divided. The latter can also be adjusted via a more or less pointed end of the water guiding device facing the respective flush water outlet.

[0045] According to the invention, the free cross-section of the first flushing water opening lies in a range from 4 mm to 35 mm, preferably in a range from 10 mm to 32 mm, and particularly preferably in a range from 15 mm to 30 mm, and the free cross-section of the second flushing water opening lies in a range from 4 mm to 35 mm, preferably in a range from 4 mm to 15 mm, and particularly preferably in a range from 4 mm to 12 mm. The amount of flushing water emerging from these flushing water outlet openings can be adjusted by selecting the size of the opening, or rather the free cross-section of the flushing water outlet openings. The flushing water outlet openings can have a round or oval cross-section, but can also have a square cross-section if desired.

[0046] Furthermore, the first and / or second flush water outlet openings can either consist of a single outlet opening or be divided, for example by a grid, into a plurality of separate but adjacent individual outlet openings. In this way, the invention makes it possible to fan out the escaping flush water into a jet-like pattern and thus wet the surface area of ​​the inner surface of the toilet bowl exposed to the flush water in a defined and selectively adjustable manner.

[0047] The prefabricated closure component is preferably made of a ceramic material and is inserted in the green state into the ceramic material intended for the production of the sanitary fixture, precisely positioned therein, and then fired and finished together with the ceramic material intended for the production of the sanitary fixture. Thus, the entire flush water-conducting section of the flush toilet produced according to the invention is formed in one piece and made of ceramic. As mentioned above, the flush water outlet is designed as a flush water distributor that is integrated in one piece into the toilet body, which is particularly preferred from a design perspective.

[0048] A significant advantage of such a flushing water distributor, or rather such a water supply device, which is installed in the form of a prefabricated component, is that this prefabricated component can be manufactured in a separate manufacturing process with very high precision and enables extremely precise flushing water distribution and thus flushing water guidance.

[0049] The method according to the invention thus enables the production of a flush toilet with an optimized flushing of the sanitary bowl and thus an optimal removal of any residues from the toilet bowl, since the interior of the flush bowl can be targeted with flushing water, which flows from the flushing water distributor into the sanitary bowl according to a predefined flow pattern.

[0050] According to one embodiment, the flushing water distributor is manufactured as a prefabricated component which is composed of hollow elements which are formed from a first hollow element and a second hollow element connected to the first hollow element, wherein the first and the second hollow element together form a fluid channel which opens into two fluid outlet openings pointing in different directions, which respectively form the first flushing water outlet opening and the second flushing water outlet opening, and wherein the flushing water distributor further comprises a fluid inlet opening which communicates with the fluid channel and which is a flushing water inlet opening.

[0051] The flush water distributor could be composed of hollow elements that are either subsequently joined to create the prefabricated component or manufactured directly as a single piece. This offers the advantage that the hollow elements used to manufacture the flush water distributor can, on the one hand, be manufactured simply and with high dimension accuracy, and, on the other hand, can be combined with one another in an extremely flexible manner, allowing the formation of fluid channels that are either very simple and largely straight, or very complex and provided with bends and curves. In this way, even complicated flush water supply devices can be manufactured simply yet very precisely using conventional ceramic methods, which are then installed and integrated into the flush toilet produced according to the invention.It should be noted that the flush water distributor can also have more than two flush water outlet openings if required.

[0052] A further advantage of the use according to the invention of a flush water distributor designed as a prefabricated component that should not be neglected is that such a flush water distributor can be arranged very close to the wall of the inner surface of the toilet bowl in the flush toilet body, so that the flushing liquid emerging from the flush water outlet openings can be directed tangentially to the inside of the toilet bowl in an optimal manner and with an almost laminar flow, which contributes to a further inventively optimized flushing of the flush toilet produced according to the invention.

[0053] The flushing water distributor has a distance of the first and second flushing water outlet openings in the range of 30 mm to 90 mm, preferably 40 mm to 80 mm and particularly preferably 50 mm to 80 mm, relative to their nearest mutually facing hole-to-hole edges.

[0054] As already mentioned, the flush water distributor is particularly suitable for a rimless flush toilet.

[0055] Thus, the flush water distributor is compactly designed and directs the flush water in two opposing directions. The main flush water is directed forward from a large spout, and a small jet of flush water is directed backward to clean the surface of the inside of the toilet bowl in this often neglected area. Both the main flush water stream and the counter-flowing, smaller flush water stream flow in a circular or circular pattern that essentially corresponds to or is adapted to the internal geometry of the toilet bowl.

[0056] The toilet is connected to a water source, such as a water tank, located in the ceramic behind the surface of a wall-hung toilet bowl via a centrally located water inlet. The water flows through the flush water inlet through the side channel to the flush water distributor, where the water flow is split and flows into the toilet bowl through two differently sized flush water outlet openings in different directions. The large flush water outlet opening opens into a rear, side "corner" at the top of the toilet bowl and directs a large portion of the flush water forward, i.e. tangentially along an edge running along the side of the inside of the toilet bowl into the toilet bowl, so that the flush water essentially flows along the periphery of the toilet bowl.The flushing water constantly loses flow energy and flows down the inner side walls of the toilet bowl, cleaning them in the process. According to the invention, the edge tapers to zero before it almost reaches the imaginary centerline of the rear wall of the toilet bowl. According to an alternative embodiment of the invention, the edge or ledge can also extend completely and with the same thickness around the entire inner surface of the toilet bowl. An embodiment without such an edge and without such a ledge is also possible according to the invention.

[0057] The small, backward-directed flushing water jet is specifically designed to flush the toilet bowl in this area, thus entering tangentially along the smooth, rear part of the bowl at an angle to the main stream. This is the part of the bowl that normally cannot be cleaned with a standard water distributor, or can only be cleaned with a torrential main stream. According to the invention, the water flows along a ledge or ledge that tapers almost to the imaginary centerline of the toilet bowl. In some cases, no ledge or ledge is necessary in this area.

[0058] The partial flush flow that flows out of the smaller flush water outlet opening during a flushing process is diverted by the geometry of the water distributor and the resulting back pressure. Thus, the incoming flush water forces the partial flush flow through the smaller flush water outlet opening without the water having to be directed through U-shaped bends, a disadvantageous design known from the prior art.

[0059] According to a preferred embodiment of the invention, the water distributor, if it protrudes slightly from the toilet body, is approximately 35 mm to 50 mm high, 50 mm to a maximum of 80 mm wide, and approximately 25 mm to 40 mm deep. The two holes are arranged, for example, at a distance of approximately 70 mm and have an internal angle of approximately 90 degrees.

[0060] The position of the distributor is located in the corner area of ​​the flush toilet produced according to the invention, i.e. approximately 45 degrees, in particular 30° to 60°, offset to the side in the toilet bowl, in relation to the center line, wherein the angle results from the intersection point of a straight line with the center line at its center on the inside of the bowl, or half, wherein the straight line extends from the flush water distributor to the center of the center line on the inside of the bowl, i.e. its center on the inside of the bowl.

[0061] The two flushing water streams meet, with the smaller stream being carried along by the main stream, and both flushing water streams are directed into the siphon. The entire flushing water flow, which is directed into the siphon, then flushes the siphon.

[0062] Furthermore, the flush toilet is manufactured with a drain hole positioned eccentrically with respect to the imaginary centerline. This drain hole is located in a pipe that acts as a siphon, which acts as an odor trap. When the flush toilet is in operation, the drain hole is located below the water line of the siphon or odor trap. The flush toilet is manufactured in such a way that the water line in the flush toilet is positioned centrally and symmetrically with respect to the imaginary centerline. Given the central and symmetrical water line of the siphon, the appearance of the flush toilet is reminiscent of familiar flush toilets with a drain hole that is also positioned centrally and symmetrically.

[0063] The part of the siphon on the flush toilet body side extends asymmetrically from the symmetrical waterline toward the drain hole. The symmetrical shape of the siphon at the waterline, i.e., the uppermost part of the siphon on the flush toilet body side, transitions into an asymmetrical, approximately elliptical, slightly oval, compressed shape rotated toward the drain hole. Thus, a horizontal cross-section of the siphon on the drain hole side is rotated relative to a horizontal cross-section of the siphon on the waterline side. Furthermore, the horizontal cross-section of the siphon on the drain hole side has a shorter circumferential length than the horizontal cross-section of the siphon on the waterline side.

[0064] At this point it should be clarified again that in the context of this invention the term "siphon" is to be understood as an odor trap with the functionality of an odor trap based on a water column. The siphon is divided into a first part, which begins in the toilet body and is limited by a water line towards the toilet bowl, and a final part that forms a connection to a waste pipe. Between the first part of the siphon and the last part of the siphon there is at least a middle part of the siphon, which has a U-shaped and at least one further lateral bend and which, in order to fulfill the function of an odor trap, is filled with water during operation at least in the U-shaped part. This at least one middle part of the siphon also serves to compensate for the eccentricity of the drain hole relative to the waste pipe connection.

[0065] The geometry of the drain hole produced according to the invention is round, oval and / or has a cross-section formed from at least two assembled circular segments and / or straight segments.

[0066] Furthermore, the part of the siphon adjoining the drain hole is manufactured in an arcuate and / or diagonal manner and / or with at least a single, in particular double, curve. In this way, it is easily possible to design the part of the odor trap adjoining the drain hole, which is not visible from the outside to a user of the flush toilet, in such a way that it can be connected on the one hand to the eccentrically arranged drain hole and on the other hand to a conventional connection to a wastewater pipe, which is centrally arranged as in conventional toilets. Adapting the siphon or odor trap pipe to compensate for the eccentricity of the drain hole to a connection to a wastewater pipe that is centrally arranged with respect to the flush water inlet opening of the flush toilet, which is centrally arranged at the rear, is achieved by curving the part of the odor trap pipe adjoining the drain hole.In this way, the flush toilet manufactured according to the invention can be connected to any conventional water supply and drainage connection for flush toilets. For this purpose, the odor trap pipe has a cross-section that corresponds to the cross-section of the drain hole and a round cross-section.

[0067] The drain hole is therefore positioned eccentrically with respect to the flush water inlet connection, which is located centrally at the rear of the flush toilet.

[0068] The connection of the eccentrically arranged drain hole to the waste water pipe, which is also located centrally, namely below the flush water inlet connection, is made via the curved siphon.

[0069] Furthermore, it should be noted that the green body, the closure component, if applicable the distributor component and if applicable the siphon are fired together and formed in one piece to form a one-piece flush toilet.

[0070] Advantageously, it is thus possible according to the invention to arrange the drain hole in the siphon of the sanitary device produced according to the invention in such a way that the swirling flushing water with its entire momentum and thus its entire flushing power can flow directly into the eccentrically arranged drain hole and in this way residues in the sanitary bowl are disposed of completely and residue-free through the drain hole in the direction of the wastewater pipe.

[0071] A further advantage of the invention is that the respective arrangement of the drain hole and the respective geometry of the sanitary fixture, or rather the sanitary bowl, can be adapted to each other in such a way that optimal circulating flushing within the sanitary bowl and optimal flushing from the sanitary bowl are possible. This allows both the flush water inlet and the flush water outlet to be optimally matched to the geometry of the sanitary bowl, something that was previously not possible with conventional toilets with a centrally located drain hole.

[0072] Depending on the selected cross-sectional geometry of the drain hole, the cross-section of the drain hole has a longest extension. A section of this longest extension of the drain hole is oriented essentially transversely or, alternatively, essentially perpendicularly to the flushing water flow flowing into the drain hole. In this way, the drain hole can be designed according to the invention so that the flushing water reaching the drain hole enters the drain hole optimally and without pressure loss, thus allowing the maximum flushing force of the flushing water to be utilized.

[0073] According to the invention, the longest extension of the drain hole is in the range from 20 mm to 120 mm, preferably in the range from 30 mm to 100 mm and particularly preferably in the range from 45 mm to 85 mm, wherein a ratio of the longest extension extending across the cross section of the drain hole to a maximum shortest extension extending across the cross section of the drain hole is in the range from 1:1 to 1:10, preferably in the range from 1:1 to 1:5. According to the invention, the drain hole is thus deformed from round to oval.

[0074] According to the invention, a sanitary fixture is provided that has a drain hole that is arranged asymmetrically and, in particular, eccentrically with respect to a center line. The invention provides significant improvements, primarily based on the fact that the asymmetrical and eccentric design of the drain hole enables the best possible utilization of the flushing performance of the circulating flush water.

[0075] Furthermore, the invention relates to a flush toilet with a flush water inlet opening arranged centrally at the rear in a state of use and a flush water dispensing device arranged decentrally in a rear area of ​​the flush toilet located to the side of an imaginary center line, which is manufactured according to the above embodiments.

[0076] Further embodiments of the invention emerge from the subclaims.

[0077] The invention is described below using an exemplary embodiment, which is explained in more detail with reference to the figures. Herein: Fig. 1 to 3 are schematic representations of an embodiment of a manufacturing method of the invention, and Fig. 4 is a schematic perspective view of a flush toilet equipped with the Fig. 1 to 3.

[0078] In the Fig. 1 to Fig. 3 shows the manufacturing method according to the invention for producing the flush toilet 10. Within the scope of this manufacturing method, a green compact 12 is first cast using a porous casting mold, which has a flush water inlet opening 20 located centrally on the rear side 15 of the green compact 12 with respect to an imaginary center line 30, as well as an eccentric production access opening 60, also accessible from the rear side 15. After casting the green compact 12, it has an initially closed flush water inlet opening 20, which closes off a cavity, which later forms a side channel 80, in the direction of a later flush water supply line. In the direction of a flush water discharge device 50, this cavity, or later side channel 80, is also closed, wherein Fig. 1, the location is marked by reference numeral 90 which will represent a later fluid communication opening and through which fluid communication opening 90 flushing water will flow through the flushing water inlet opening 20 through the side channel 80, through the fluid communication opening 90 to the flushing water discharge device 50.

[0079] After casting the green compact 12, it is produced by solidifying a liquid slip, which is poured into the porous casting mold, adjacent to the wall of the casting mold until the desired wall thickness of the future flush toilet 10 is achieved for the green compact 12 and the green compact has solidified to a dimensionally stable level. The still-liquid slip located in the cavity, i.e., in the future side channel 80, is then removed through openings provided in the casting mold, thereby creating the side channel 80. In addition to opening the fluid communication opening 90, according to the invention, a second flush water outlet opening 44 is also opened, unless it was already left open during the production of the green compact 12, like the first flush water outlet opening 42.

[0080] The first flush water outlet opening 42 and the second flush water outlet opening 44 together form the flush water discharge device 50, which is arranged in a rear lateral region 40 of the green body 12, or of the later flush toilet 10.

[0081] After opening the fluid communication opening 90, which is in Fig. 1 in closed position and in Fig. 2 is shown in the open state, a closure component 100 in the form of a precisely fitting prefabricated component is attached through the production access opening 60 adjacent to the opened side channel 80 so that the production access opening 60 is closed fluid-tight to the rear and water can flow from the flush water inlet opening 20 through the side channel 80 in the direction of the flush water discharge device 50 and from there into the toilet bowl 70. This is shown in Fig. 3 shown schematically.

[0082] Fig. 3 thus represents a schematic view of the fully formed green compact 12, from which the subsequent flush toilet 10 is produced by firing. In addition to the described flush water supply path, the green compact further comprises a water guiding device 120 in the form of a strip that extends along an inner periphery of the toilet bowl 70 and serves to specifically guide the flush water flowing from the first flush water outlet opening 42 and the second flush water outlet opening 44. Furthermore, it should be mentioned in this context that the flush water dispensing device 50 can be in the form of a precisely prefabricated distributor component 110, which is either inserted into the casting mold with precise positioning and then encapsulated before the green compact 12 is cast, or alternatively inserted into the green compact 12 with precise positioning and fit.

[0083] Furthermore, in the Fig. 1 to Fig. 3 that the flush toilet produced according to the invention has an eccentrically arranged drain hole 140, which is arranged in a siphon 150 serving as an odor trap, which defines a water line 130 on the flush toilet side, and defines the hole for a user standing in front of the flush toilet 10, from which the contents of the flush toilet 10 are discharged through a pipe defining the odor trap, or siphon 150, whose U-shaped curvature in Fig. 4 is clearly visible in the direction of a wastewater pipe (not shown). The water line 130 is formed at the upper flush toilet side boundary of the siphon 150 and, as in conventional toilets, is symmetrical with respect to the center line 30, while the siphon 150 itself extends asymmetrically in the direction of the eccentrically arranged drain hole 140, which is due to the Fig. 1 to Fig. 3 the drain hole 140 is indicated by a line approximately in the shape of an oval.

[0084] Furthermore, it is particularly clear from the Fig. 2 to Fig. 4 that the first flushing water outlet opening 42 is arranged so that a flushing water flow, which, as in Fig. 3 is schematically shown, in a first initial flushing direction 52 from this first flushing water outlet opening 42 into the toilet bowl 70, first following the inner periphery of the flushing toilet 10 over the water guiding device 120 in the direction of the front end of the flushing toilet 10 and then being redirected along the wall of the toilet bowl 70 in the direction of the rear end of the flushing toilet 10, while at the same time a second flushing water flow which, as in Fig.3, flows in a second initial flushing direction 54 from the second flush water outlet opening 44 along the rear wall of the toilet bowl 70, counter to the first flush water stream, in order to clean the surface not overflowed by the first flush water stream, before it hits it and continues to circulate with it towards the siphon 150. With the two different water jets, the complete internal geometry of the toilet bowl 70 is combined, and the water jets are redirected towards the siphon 150.

[0085] At this point, it should be noted that all parts described above, viewed individually and in any combination, particularly the details shown in the drawings, are claimed as essential to the invention. Modifications to these are familiar to those skilled in the art. List of reference symbols 10 flush toilet 12 greenfinch 15 Back 20 Flushing water inlet opening 30 imaginary center line 40 rear side area 42 first flushing water outlet opening 44 second flushing water outlet opening 50 Rinse water dispenser 52 first initial flush direction 54 second initial flush direction 60 Production access opening 70 toilet bowl 80 side channel 90 Fluid communication opening 100 locking component 110 Distributor component (pre-cast part) 120 Water guiding device, bar 130 waterline 140 drain hole 150 Siphon = odor trap

Claims

[1] Method for producing a flush toilet (10) with a flush water inlet opening (20) arranged centrally at the rear in a state of use and a flush water dispensing device (50) arranged decentrally in a rear region (40) of the flush toilet (10) located to the side of an imaginary center line (30), the method comprising the following steps: - Providing a multi-part porous casting mold for producing a green body (12) of the flush toilet (10), wherein the green body (12) - a manufacturing access opening (60) which allows access to the decentrally arranged flush water dispenser (50) from the rear of the flush toilet (10), - has a centrally arranged flushing water inlet opening (20), - has a side channel (80) extending from the flushing water inlet opening (20) towards the production access opening (60); - Filling the mold with a liquid slip to produce a ceramic sanitary unit; - solidifying the slip by withdrawing liquid through the wall of the porous casting mould for a period of time sufficient to solidify the slip to a predetermined thickness on its surface adjacent to the casting mould; - Draining of unsolidified slip from the green body through openings provided in the casting mould; - Opening and removing the mold; - Producing at least one fluid communication opening (90) between the production access opening (60) and the side channel (80), in particular in a section of the production access opening (60) adjacent to the rinsing water discharge device (50), and - closing the production access opening (60) to form a flushing water channel so that flushing water can flow to the flushing water dispensing device (50) during operation of the flushing toilet (10). [2] Method according to claim 1, characterized by that the closure of the production access opening (60) is carried out with a prefabricated green-ceramic closure component (100), in particular one which is concavely rounded towards the flushing water channel, which is inserted through the production access opening (60) adjacent to the fluid communication opening (90) into the production access opening (60) and is secured there. [3] Method according to one of the preceding claims, characterized by that the rinse water dispensing device (50) is designed such that the rinse water dispensing device (50) comprises at least one first rinse water outlet opening (42) through which rinse water can be dispensed in a first initial rinse direction (52), and at least one second rinse water outlet opening (44) through which rinse water can be dispensed in a second initial rinse direction (54). [4] Method according to claim 3, characterized bythat the first rinsing water outlet opening (42) and / or the at least one second rinsing water outlet opening (44) are opened, in particular pierced, before a joint firing of the green compact and the first prefabricated component (100), or at least one of the rinsing water outlet openings (42, 44), in particular the first rinsing water outlet opening (42), was already produced during the production of the green compact (12). [5] Method according to one of the preceding claims 3 to 4, characterized by that the first flushing water outlet opening (42) and / or the at least one second flushing water outlet opening (44) are arranged such that the flushing water emerging from them is guided along a water guiding device formed in the interior of the toilet bowl (70), in particular along a step and / or along a strip (120) formed in the interior of the toilet bowl (70). [6] Method according to one of the preceding claims, characterized byin that a prefabricated, in particular green-ceramic, distributor component (110) is used to form the rinsing water discharge device (50), which has at least one rinsing water inlet opening and at least two rinsing water outlet openings (42, 44), is placed in the casting mold with an exact fit before loading the casting mold and is cast with slip while leaving the respective openings (42, 44) free. [7] Method according to one of the preceding claims, characterized by that the flush toilet (10) is manufactured with a drain hole (140) arranged eccentrically with respect to the imaginary center line (30), wherein the drain hole (140) is arranged in a siphon (150) serving as an odor trap and lies below a water line (130) during operation of the flush toilet (10). [8] Method according to claim 7, characterized by that the water line (130) in the flush toilet (10) is formed centrically and symmetrically with respect to the imaginary center line (30). [9] Method according to one of the preceding claims 7 to 8, characterized by that the drain hole (140) is manufactured with a round, oval and / or a cross-section formed from at least two assembled circular segments and / or straight segments. [10] Method according to one of the preceding claims 7 to 9, characterized by that the siphon adjoining the drain hole (140) is made arcuate and / or oblique and / or at least single, in particular double, curved. [11] Method according to one of the preceding claims 6 to 10, characterized by that the green body (12), the closure component (100), optionally the distributor component (110) and optionally the siphon are fired together and formed in one piece to form a one-piece flush toilet (10).

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