Cistern, in particular flush-mounted cistern, for a toilet or urinal

Abstract

The invention relates to a cistern (1), in particular a flush-mounted cistern, for a toilet or urinal, comprising a cistern body (1.1) made of plastic for receiving water, a drain valve (3) which has a closure body (3.1) that can be moved from a closing position into a flushing position, wherein the closure body (3.1) has a seal (12) which sealingly lies on a valve seat (2) in the closed position, and an actuation device (15) for actuating the drain valve (3). The aim of the invention is to provide such a cistern (1) in a particularly inexpensive manner using little material. According to the invention, this is achieved in that the cistern body (1.1) has at least two, preferably at least three, substantially parallel elongated depressions (1.15) in the front wall (1.13) and / or rear wall (1.14) of the cistern body when viewed from the outside.

Description

[0001] Cistern, especially concealed cistern, for a toilet or urinal

[0002] The invention relates to a cistern, in particular a concealed cistern, for a water closet or urinal, with a cistern body made of plastic for receiving water (flush water), with a drain valve which has a closure body which can be moved from a closed position into a flushing position, wherein the closure body has a seal which rests sealingly on a valve seat in the closed position, and with an actuating device for actuating the drain valve.

[0003] According to current standards, flush toilets and urinals must be emptied using flushing devices connected to a water pipe. These are usually cisterns or pressure flush valves.

[0004] Cisterns for water closets or urinals are available in numerous designs, including high-hung cisterns, low-hung cisterns, cisterns mounted on the toilet bowl, and concealed cisterns; the latter are also known as concealed cisterns.

[0005] The flush water volume of toilet cisterns is typically approximately 6 to 9 liters. In contrast, the flush water volume of urinal cisterns is typically approximately 2 to 4 liters.

[0006] Cisterns with cistern bodies made of enameled cast iron or porcelain are known, for example, in the form of high-hanging or surface-mounted cisterns. For cost reasons, cistern bodies for toilet cisterns are now mostly made of plastic. However, even with conventional plastic cistern bodies, material consumption is high. Furthermore, with conventional plastic cisterns, the cooling times required for the plastic to solidify during the molding of the cistern body are long.

[0007] Storing and transporting conventional cisterns requires a lot of relatively expensive packaging material. Accordingly, a lot of packaging waste is generated.

[0008] When it comes to cisterns, drinking water consumption plays an important role alongside the quality and ease of installation of the products. In many countries, a relatively high proportion of drinking water flows through the toilet. By reducing drinking water consumption using water-saving flushing technologies, consumers can protect the environment and their wallets. The well-known "dual-flush technology" can save considerable quantities of drinking water. With this flushing technology, a small flush is fixed at, for example, around 3 liters and is usually based on the full flush water volume. With known drain valves of the dual-flush technology, the full flush volume can be variably set on the drain valve to approx. 9 liters, 6 liters or 4.5 liters. The two different flush volumes are typically assigned flush buttons of different sizes or with differently marked labels.Pressing the large flush button triggers the full flush volume, pressing the small button triggers the small flush volume.

[0009] As an alternative to dual-flush technology, cisterns can be converted to the equally well-known flush-stop technology. This flushing technology allows the flush duration and thus the flush volume to be individually controlled. Pressing the flush button initiates the flushing process, while pressing the stop button or pressing the flush button in the opposite direction ends the flushing process before the entire amount of water has been drained.

[0010] However, implementing dual-flush technology, in particular, requires complex drain valve technology. This applies particularly to the components used to select one of the preset full flush volumes. In addition, conventional actuator plates use springs to reset the flush buttons or pressure pieces, which are complex to manufacture and assemble.

[0011] Another problem that sometimes occurs with conventional cisterns is excessive flush flow, which causes water to splash out of the toilet bowl during the flushing process. To solve this problem, flush flow restrictors have been developed, particularly flush flow restrictors that can be adjusted in terms of their cross-sectional area and are located, for example, below the valve seat. However, adjusting such flush flow restrictors is cumbersome.

[0012] Based on the prior art described above, the object of the invention is to provide a cistern of the type mentioned at the outset which reduces one or more of the problems mentioned and is preferably characterized by lower costs.

[0013] This object is achieved by a cistern having the features specified in claim 1. Advantageous embodiments of the cistern according to the invention are specified in the subclaims referring back to claim 1.

[0014] The cistern according to the invention is characterized in that its cistern body has, as seen from the outside, at least two, preferably at least three elongated recesses running essentially parallel to one another in its front wall and / or rear wall.

[0015] The invention considerably increases the structural strength and dimensional stability of the cistern body, so that its wall thickness can be significantly reduced without a critical loss of stability occurring. A reduction in the wall thickness of the cistern body while maintaining the same stability due to the inventive design of the cistern body wall leads to material and cooling time savings and thus to an advantageous reduction in the manufacturing and transport costs of cisterns of the type mentioned above. Due to its high structural strength and dimensional stability, the cistern body of the cistern according to the invention can, for example, have an average wall thickness in the range of only approximately 0.8 mm to 2.5 mm, preferably in the range of only approximately 1.0 mm to 2.2 mm, and particularly preferably in the range of only approximately 1.4 mm to 2.0 mm.

[0016] An additional advantage of the design of the box body according to the invention is that its elongated recesses ensure better plaster and mortar adhesion and thus enable simplified wet construction installation of the box body with cost-effective fastening means without a pre-wall mounting frame.

[0017] Preferably, the or at least some of the mutually parallel elongated recesses formed in the front wall and / or rear wall of the box body form a rib structure.

[0018] The cistern body of the cistern according to the invention is preferably designed as a one-piece plastic container and manufactured by blow molding. Alternatively, it can also be made in two parts and / or by plastic injection molding.

[0019] The elongated recesses, which run essentially parallel to one another in the front and / or rear walls of the box body, preferably run essentially horizontally in the specified use position (assembly position) of the box body. Furthermore, at least some of the elongated recesses are preferably designed as circumferential recesses in the form of grooves, troughs, or beads in the wall of the box body.

[0020] According to a further advantageous embodiment of the invention, at least one or more of the recesses have a varying depth along their length. This allows the ratio of the structural strength or dimensional stability of the box body to be optimized with respect to a reduced wall thickness of the box body, resulting in particularly low material consumption and particularly short cooling times for the production of the box body while maintaining or sufficient stability of the box body.

[0021] With regard to this technical effect, it is also advantageous if, in a further embodiment of the invention, at least one or more of the recesses have / have an arcuate or convex channel base along their length and / or if, in a further embodiment of the invention, at least one or more of the recesses have / have a varying width along their length. Preferably, the width of at least one of the recesses increases from the center of the box body in a lateral direction.

[0022] A further advantageous embodiment of the invention provides that the box body has one or more beads in its front and / or rear wall, extending into the base of the box body. This design allows the wall thickness of the box body and the material consumption for its production to be further reduced without critically compromising stability.

[0023] For cost-effective and stable installation of the cistern, it is also advantageous if, according to a further embodiment of the invention, the cistern body has at least one fastening hole in its rear wall, which is arranged above the closure body of the drain valve at a vertical distance relative to the closure body, based on its closed position, and / or if the cistern body has at least one front-side fastening means, preferably in the form of a fastening tab, wherein the fastening means preferably protrudes upward relative to the top side of the cistern body. This creates one or more advantageous screwing options for cost-effective and stable installation of the cistern.The at least one fastening hole arranged in the rear wall of the cistern body is preferably located, in the specified position of use of the cistern, at the height of an inspection opening formed in the front wall of the cistern body, for example, at the height of the upper half, particularly preferably at the height of the uppermost third of the inspection opening. Furthermore, this configuration(s) contribute(s) to a reduction in the number of components of the cistern according to the invention.

[0024] A further embodiment of the invention provides that the cistern body has a base inclined toward the valve seat. Preferably, the base is inclined toward the valve seat from the narrow sides of the cistern body, i.e., is formed with a gradient. The gradient is preferably more than 10°, particularly preferably more than 15°. This embodiment is advantageous for achieving a relatively high flush flow toward the end of the flushing process and thus a high flushing and cleaning power. At the same time, this embodiment is advantageous for optimizing material consumption during the manufacture of the cistern, with regard to the flush water volume of the cistern specified by standardization.

[0025] The above-derived object underlying the invention is also achieved in that the cistern body is designed such that it can be used as packaging for a variety of components of the cistern, in particular as packaging for the actuating device, the closure body of the drain valve, a filling valve, a flush pipe to be connected to the valve seat, a flush pipe extension piece and / or a positioning piece with an integrated lever mechanism for actuating the drain valve. The cistern body thus also serves as packaging. Preferably, during transport to a point of sale or an assembly location of the cistern according to the invention, all of the aforementioned components of the cistern are accommodated in its cistern body. In this case, one can also speak of an "all-in-one packaging" design. The components can be accommodated loosely or at least partially secured in the cistern body.This design of the aforementioned cistern saves on expensive packaging and significantly reduces packaging waste. The invention thus relates in particular to the use of a cistern body of the aforementioned type as packaging, preferably as a so-called "all-in-one package," in which all components of the cistern are or are packaged in its body.

[0026] According to a further advantageous embodiment of the invention, the valve seat is integrally connected to the cistern body, preferably welded. This reduces the number of components of the cistern according to the invention. For example, compared to conventional cisterns, a sealing ring between the cistern body and the valve seat, as well as a nut for attaching the valve seat to the cistern body, can be eliminated.

[0027] The above-derived object underlying the invention is also achieved by providing the valve seat with vertically extending guide elements for guiding the closure body, wherein the guide elements are preferably formed integrally with the valve seat. This enables particularly cost-effective production of the drain valve with reliable function, in particular a reliable closing function.

[0028] The closure body of the drain valve is preferably designed as an overflow pipe.

[0029] According to a further embodiment of the invention, the closure body is coupled to a lever of a lever mechanism for actuating the drain valve, wherein the lever is pivotably mounted on a positioning piece. Preferably, the positioning piece has at least one integrally formed leg or web on which the lever is pivotally mounted. Such a mechanism can be manufactured cost-effectively and is characterized by high functional reliability. Preferably, the lever is pivotally mounted in a fork formed from at least two legs or webs, wherein the legs or webs are integrally formed with the positioning piece.The positioning piece can preferably be detachably connected to the box body in a form-fitting manner, with the box body having at least one form-fitting element associated with the positioning piece on its rear wall inside, and the box body having an inspection opening in its front wall that defines an edge to which the positioning piece can be connected in a form-fitting manner. The positioning piece, which has the lever mechanism, can thus be quickly and easily mounted on the box body and just as easily removed for maintenance purposes.

[0030] A further advantageous embodiment of the invention is that the closure body has a larger-diameter lower end, which is preferably cylindrical. This design improves the closing function of the drain valve. The larger-diameter lower end of the closure body defines a radial shoulder, the outer surface of which is preferably conical. When the closure body is in its raised flushing position and the flushing process is subsequently terminated, water in the box body flowing toward the valve seat presses against the outer surface of the radial shoulder of the closure body (or overflow pipe), thus supporting the closing function of the drain valve.

[0031] According to a further advantageous embodiment of the invention, the closure body is provided at its lower end with a funnel-shaped or spherical-shell-shaped seal. This further optimizes the closing function of the drain valve. The spherical-shell-shaped or funnel-shaped seal of the closure body compensates for any misalignment or angular error of the closure body, so that when the closure body is in the closed position, the drain valve reliably prevents water from accidentally draining into the connected toilet bowl. Furthermore, the spherical-shell-shaped or funnel-shaped seal of the closure body prevents water droplets from forming on the valve seat. This significantly reduces limescale buildup on the valve seat and requires less maintenance to eliminate leaks caused by limescale.In addition, the spherical shell or funnel-shaped seal is aerodynamically favorable; it sometimes supports the lifting of the closure body from its closed position to its flushing position.

[0032] Furthermore, the object derived above and underlying the invention is also achieved in that the actuating device has a fastening frame on which an operating element (pressure piece) for actuating the drain valve is movably mounted, wherein at least one spring is integrally formed on the fastening frame, which spring returns the operating element to an initial position after being relieved of load from an actuating position. By designing the at least one spring, preferably at least two springs, as spring(s) integrally formed on the fastening frame, the number of individual parts of the cistern is reduced and thus the manufacturing effort, in particular when assembling the components of the cistern, is advantageously reduced. The at least one spring can, for example, be designed in the form of a spring arm or a spring tab.

[0033] The desired flush volume can be continuously controlled by the operating time (pressing time) of the control element. As soon as the manually operated control element or pressure piece of the actuating device is manually released, at least one spring returns the control element (pressure piece) from the respective actuating position to its original position. This return preferably occurs immediately, for example, without any significant delay.

[0034] According to a further advantageous embodiment of the invention, the actuating device is provided with an adjustment device for variably limiting the stroke of the drain valve or closure body. This allows the flush flow to be conveniently adjusted to prevent any flush water from splashing out of the toilet bowl during the flushing process. By arranging such a flush flow adjustment device on the actuating device, the adjustment device is easily and conveniently accessible.

[0035] A further embodiment of the invention provides that the adjustment device has a screw for continuously adjusting the range of motion of a push plate acting as an operating element. The screw, which can also be referred to as a set screw, defines an adjustable stop. By screwing the screw in or out, the flush flow can be continuously adjusted. The respective position of the screw limits the range of motion of the operating element or the stroke of the push plate, and thus the stroke of the drain valve's closure body. This means that depending on the position of the screw, the closure body can be raised more or less.

[0036] The invention is explained in more detail below with reference to a drawing illustrating exemplary embodiments. In the drawings:

[0037] Fig. 1 shows a cistern according to the invention with a flush pipe connected thereto and a plate-shaped actuating device shown above the cistern body, in front view, the cistern body being shown partially broken away;

[0038] Fig. 2a to 2d the box body in front view (Fig. 2a), side view (Fig. 2b), a perspective front view (Fig. 2c) and a perspective bottom view (Fig. 2d);

[0039] Fig. 2e the box body in a horizontal cross-sectional view along the section line He-lle in Fig. 2a;

[0040] Fig. 3a to 3c show the valve seat of the drain valve of a cistern according to the invention with the associated closure body in the closed position and with a lever mechanism for lifting the closure body from the valve seat, in a front view (Fig. 3a), a side view (Fig. 3b) and a perspective view (Fig. 3c);

[0041] Fig. 3d shows the valve seat with the lower end of the closure body in a vertical longitudinal sectional view along the section line lld-lld in Fig. 3a;

[0042] Fig. 4a to 4d show the actuating device in the form of an actuating plate, in a front view, a rear view, a perspective rear view and a perspective front view, in which the plate-shaped operating element (pressure piece) is unlocked from the fastening frame and pivoted forward; and

[0043] Fig. 5 shows a cistern according to the invention, the cistern body of which is used as packaging for a plurality of the components of the cistern, in a perspective view, the cistern body being shown in dashed lines to better illustrate the components accommodated therein.

[0044] The cistern 1 shown in the drawing is designed for wall installation, particularly for wet-wall installation in a pre-wall or wall niche. Alternatively, the cistern 1 can also be used for drywall installation in a pre-wall installation.

[0045] The cistern 1 has a cistern body 1.1 made of plastic. The cistern body 1.1 is constructed in one piece and preferably by blow molding. A drain opening 1.11 is formed in the base 1.10 of the cistern body 1.1, which is provided with a valve seat 2 of a drain valve 3 (Fig. 1 and Fig. 2d). The valve seat 2 is formed on a pipe socket 2.1, to which a flush pipe 4 for conveying flush water into a toilet bowl (not shown) is or is connected. The pipe socket (connecting socket) 2.1 has a funnel- or flange-shaped section 2.11, to which it is or is watertightly connected to an annular collar 1.12 surrounding the drain opening 1.11 and projecting downwards from the base 1.10 of the cistern body 1.1. This connection is preferably designed as a material connection in that the funnel-shaped or flange-shaped section 2.11 of the pipe socket 2.1 is connected to the base 1.10 and / or the collar 1.12 of the box body 1.1 is glued or welded all around.

[0046] The valve seat 2 is provided with guide elements 2.2 for guiding the closure body 3.1 of the drain valve 3. The guide elements 2.2 extend vertically and are designed, for example, as web-shaped annular wall segments that are substantially evenly spaced from one another along the edge of the annular valve seat surface 2.3. Preferably, the guide elements 2.2 are formed integrally with the valve seat 2. The valve seat 2 with the pipe socket 2.1 and guide elements 2.2 is manufactured as a single-piece plastic injection-molded part.

[0047] The outside of the pipe socket 2.1 is provided with ring seals 5, preferably rubber O-rings, which serve to provide a watertight seal between the pipe socket 2.1 and the flushing pipe 4 attached to it. The ring seals 5 are inserted, for example, in axially spaced annular grooves 2.12, which are defined by radial projections 2.13, preferably circumferential ribs. The length of the flushing pipe 4 or its vertical position can be adjusted by axial displacement along the pipe socket 2.1 of the valve seat 2.

[0048] The cistern body 1.1 of the cistern 1 shown in Figures 1 to 2d, for example, has a flush water volume of approximately 6 liters. The average wall thickness of the cistern body 1.1 is preferably only approximately 2 mm or less. This results in considerable material savings compared to conventional cisterns and a significant reduction in the cooling times of the hot-formed plastic material. To ensure that the cistern body 1.1 has sufficiently high structural strength and dimensional stability despite its low wall thickness, at least two, preferably at least three, essentially parallel elongated recesses 1.15 are formed in its front wall 1.13 and / or rear wall 1.14.

[0049] In the embodiment shown in Figures 1 to 2d, the box body

[0050] 1.1 has, among other things, four such recesses 1.15, which are preferably formed as circumferential recesses in both the front wall 1.13 and rear wall 1.14, as well as in the narrow side walls 1.161, 1.162 of the box body 1.1. Furthermore, additional recesses 1.17, 1.18 are preferably formed laterally next to and at the level of the inspection opening 6 in the wall of the box body 1.1, of which a relatively short recess 1.17 extends from the front wall 1.13 into the narrow side wall 1.161, which has a through-opening 7 for arranging and securing a filling valve 8. The elongated recess 1.18 at the level of the inspection opening 6 extends from the front wall 1.13 over the other narrow or right side wall 1.162 and the rear wall 1.14 into the side wall 1.161 having the through opening 7.

[0051] The filling valve 8 is a float-operated valve which has an external thread

[0052] 9.1, a plastic connecting pipe section 9 is attached to the through-hole 7. The water inlet, which has the filling valve 8, is preferably designed inside the cistern body 1.1 without an additional shut-off valve. The elimination of the shut-off valve otherwise typically arranged here reduces the component costs of the cistern 1.

[0053] The circumferential recesses 1.15 in the wall of the box body 1.1 formed below the inspection opening 6 have a varying depth along their length. For example, they each have an arcuate or convex channel base surface 1.151 along their length in the front wall 1.13 and also in the narrow side walls 1.161, 1.162 (see in particular Figs. 2b, 2d, and 2e). Furthermore, it can be seen in Figs. 2b and 2c that at least one of the recesses 1.15 has a varying width along its length. In particular, it can be seen that the width of at least one of the recesses 1.15 increases from the center of the box body 1.1 in a lateral direction.

[0054] To achieve sufficiently high structural strength with a low wall thickness, beads 1.19 are also formed in the lower area of ​​the front wall 1.13 and in the lower area of ​​the rear wall 1.14, extending into the bottom 1.10 of the box body 1.1. The bottom 1.10 of the box body 1.1 is inclined from the narrow sides 1.161, 1.162 toward the valve seat 2, i.e., it has a gradient. The gradient is preferably in a range of 10° to 25°, particularly preferably in a range of 15° to 20°.

[0055] The box body 1.1 offers several screwing options for its installation. One screwing option is that the box body 1.1 has, for example, two fastening holes 10 in its rear wall 1.14, which are arranged above the drain valve 3 at a vertical distance relative to the closure body 3.1, based on its closed position. These fastening holes 10 are preferably arranged in the uppermost third of the height range of the inspection opening 6 (see Figs. 1 and 2a). A further or alternative screwing option is provided on the front of the box body 1.1. There, for example, two fastening means 11 are designed, preferably in the form of fastening tabs. In the illustrated embodiment, these fastening means 11 protrude upwards relative to the top of the box body 1.1. The fastening means 11 are preferably substantially flush with the front of the front wall 1.13 of the box body (Fig. 2a to 2d).

[0056] The closure body 3.1 of the drain valve 3 is designed as an overflow body. It has a cylindrical, enlarged lower end 3.11. This lower end 3.11 is provided with a funnel-shaped or at least partially spherical-shell-shaped seal 12. The seal 12 is assigned to the valve seat surface 2.3. It is connected to the lower end 3.11 of the closure body 3.1 in a circumferentially fluid-tight manner, for example, by a material fit or a form-fitting and force-fitting connection. The lower end 12.1 of the seal 12, which is made of rubber or a soft plastic, for example, has a significantly smaller diameter (outer diameter and inner diameter) than the circumferential valve seat surface 2.3.

[0057] The closure body 3.1, designed as an overflow pipe, is coupled to a lever mechanism 13 for actuating the drain valve 3. The closure body 3.1 has a bow-shaped crosspiece at its upper end, under which the lever 13.1 engages to lift the closure body 3.1. The lever 13.1 is pivotally mounted on a positioning piece 14. For this purpose, the positioning piece 14 has two legs or webs 14.1 defining a bearing fork, which are formed integrally with the positioning piece. The positioning piece 14 is detachably connected to the box body 1.1 in a form-fitting manner. For this purpose, the box body 1.1 has a form-fitting element 1.141 assigned to the positioning piece 14 on the inside of its rear wall 1.14. In addition to this form-fitting connection, the lower edge 6.1 of the inspection opening 6 is used to also connect the positioning piece 14 in a form-fitting manner.The positioning piece 14 has, for example, a rear plug-in section 14.2, which is inserted into the form-locking element 1.141 of the box body rear wall 1.14, and a front hook-in section 14.3, which is hooked onto the lower edge 6.1 of the inspection opening 6.

[0058] The inspection opening 6 is closed by an actuating device 15 for actuating the drain valve 3. The actuating device 15 is essentially plate-shaped and can therefore also be referred to as an actuating plate. It has a mounting frame 15.1, on which an operating element (pressure piece) 15.2 for actuating the drain valve 3 is movably mounted. The mounting frame 15.1 is fastened to the edge of the inspection opening 6. For this purpose, fastening tabs 6.2 are formed on the inspection opening 6, for example, into which fastening screws (not shown) connected to the mounting frame 15.1 can be screwed. The operating element 15.2 is pivotally mounted on the mounting frame 15.1, for example. The pivot axis preferably runs horizontally and is arranged near the upper cross member 15.11 of the mounting frame 15.1, below the cross member 15.11. From the rear of the operating element 15.2, flexible hooks or spacers 15.21 project rearward, which have nose-shaped projections 15.22 at their ends. Stops or web edges 15.13 formed in a rear wall 15.12 of the mounting frame 15.1 are associated with the projections 15.22, which are engaged behind by the projections 15.22. The stops or web edges 15.13 are formed, for example, in through-openings 15.14 of the rear wall 15.12 of the mounting frame 15.1. By lateral, elastic bending, the projections 15.22 can be disengaged from the stops or web edges 15.13. In addition, the mounting frame 15.1 features integrally formed spring arms or spring tabs 15.16, which return the plate-shaped, manually operated operating element (push plate) 15.2 to its original position after being released from an actuating position. This spring-loaded mounting of the pressure piece (push plate) is thus directly integrated into the actuating device 15.The spring tabs (spring arms) 15.16 press with their free ends 15.17 against the rear of the plate-shaped operating element 15.2. The free ends (heads) 15.17 of the spring tabs 15.16 are preferably rounded, for example, spherical.

[0059] The operating element 15.2 acts on a push rod 16 having a thread 16.1, which is detachably connected to a threaded sleeve 17. The threaded sleeve 17 is pivotally connected to the lever 13.1 of the lever mechanism 13, with the pivot axis of the lever 13.1 and the pivot axis of the threaded sleeve 17 spaced apart and running parallel to each other (Figs. 3a to 3c).

[0060] Furthermore, the actuating device 15 is provided with an adjustment device 18 for variably limiting the stroke of the drain valve 3. For this purpose, the adjustment device 18 comprises an adjusting screw 18.1, by means of which the movement or pivoting range of the operating element (push plate) 15.2 can be continuously adjusted and thus limited. The screw 18.1 is screwed, for example, into a threaded hole 15.18 on a vertically extending rear wall web 15.19 of the mounting frame 15.1. The head of the screw 18.1 defines a stop for the operating element.

[0061] The drawing and the description of the figures clearly demonstrate that the cistern 1 according to the invention is advantageously composed of relatively few components. The cistern 1 according to the invention is therefore characterized by significantly reduced technical complexity.

[0062] In order to reduce packaging material and avoid packaging waste, according to an independent teaching of the invention, the cistern body 1.1 of a cistern of the type mentioned at the outset or of a cistern 1 of the type disclosed here is designed such that it can be used as packaging for a large number of components of the cistern 1, in particular as packaging for the actuating device 15, the closure body 3.1 of the drain valve 3, the filling valve 8, the flush pipe 4, optionally a flush pipe extension piece 20 and / or the positioning piece 14 with integrated lever mechanism 13 for actuating the drain valve 3. This inventive idea of ​​using the cistern body 1.1 as packaging is shown schematically in Fig. 5. It can be seen in Fig. 5 that, apart from the cistern body 1,1, the valve seat 2 is firmly connected to the cistern body 1. All other previously described components (components) of the cistern 1 are accommodated in the cistern body 1.1 for transport and / or storage purposes. The cistern body thus also serves as packaging, preferably as an "all-in-one package."

[0063] The implementation of the invention is not limited to the embodiments described above. Rather, numerous variants are conceivable, which are encompassed by the subject matter of the appended claims.

Claims

Claims 1. Cistern (1), in particular concealed cistern, for a toilet or urinal, - with a plastic box body (1.1) for holding water, - with a drain valve (3) which has a closure body (3.1) that can be moved from a closed position to a flushing position, wherein the closure body (3.1) has a seal (12) which rests sealingly on a valve seat (2) in the closed position, and - with an actuating device (15) for actuating the drain valve (3), characterized in that the box body (1.1) has at least two, preferably at least three, elongated recesses (1.15, 1.18) running essentially parallel to each other in its front wall (1.13) and / or rear wall (1.14) as seen from the outside.

2. Cistern according to claim 1, characterized in that at least one or more of the recesses (1.15) have / have a varying depth along their length.

3. Cistern according to claim 1 or 2, characterized in that at least one or more of the recesses (1.15) have / have an arcuate or convex channel base (1.151) along their length.

4. Cistern according to one of claims 1 to 3, characterized in that at least one or more of the recesses (1.15) have / have a varying width along their length.

5. Cistern according to one of claims 1 to 4, characterized in that the width of at least one of the recesses ( 1.15) increases from the center of the cistern body (1.1) in a lateral direction.

6. Cistern according to one of claims 1 to 5, characterized in that the cistern body (1.1) has one or more beads (1.19) in its front wall (1.13) and / or rear wall (1.14) which extend to the bottom of the cistern body.

7. Cistern according to one of claims 1 to 6, characterized in that the cistern body (1.1) has an average wall thickness in the range of 0.8 mm to 2.5 mm, preferably in the range of 1.0 mm to 2.2 mm, particularly preferably in the range of 1.4 mm to 2.0 mm.

8. Cistern according to one of claims 1 to 7, characterized in that the cistern body (1.1) is designed such that it can be used as packaging for a plurality of components of the cistern (1), in particular as packaging for the actuating device (15), the closing body (3.1) of the flush valve (3), a filling valve (8), a flush pipe (4) to be connected to the valve seat (2), a flush pipe extension piece (20) and / or a positioning piece (14) with integrated lever mechanism (13) for actuating the flush valve (3).

9. Cistern according to one of claims 1 to 8, characterized in that the cistern body (1.1) has at least one fastening hole (10) in its rear wall (1.14) which is arranged above the closing body (3.1) of the drain valve (3) at a vertical distance relative to the closing body (3.1) with respect to its closed position.

10. Cistern according to one of claims 1 to 9, characterized in that the cistern body (1.1) has at least one front fastening means (11), preferably in the form of a fastening tab (11), wherein the fastening means (11) preferably projects upwards relative to the top of the box body (1.1).

11. Cistern according to one of claims 1 to 10, characterized in that the cistern body (1.1) has a bottom (1.10) inclined towards the valve seat (2).

12. Cistern according to one of claims 1 to 11, characterized in that the valve seat (2) is materially bonded to the cistern body (1.1), preferably welded.

13. Cistern according to one of claims 1 to 12, characterized in that the valve seat (2) is provided with vertically extending guide elements (2.2) for guiding the closure body (3.1), wherein the guide elements (2.2) are preferably formed integrally with the valve seat (2).

14. Cistern according to one of claims 1 to 13, characterized in that the closure body (3.1) is coupled to a lever (13.1) of a lever mechanism for (13) actuating the drain valve (3), wherein the lever (13.1) is pivotably mounted on a positioning element (14).

15. Cistern according to claim 14, characterized in that the positioning element (14) has at least one integrally formed leg or web (14.1) on which the lever (13.1) is pivotably mounted.

16. Cistern according to claim 14 or 15, characterized in that the positioning element (14) is detachably positively connected to the cistern body (1.1), wherein the cistern body (1.1) has at least one positive locking element (1.141) on its rear wall (1.14) on the inside, associated with the positioning element (14), and wherein the cistern body (1.1) is its front wall (1.13) has an inspection opening (6) which defines an edge (6.1) to which the positioning piece (14) can be positively connected.

17. Cistern according to one of claims 1 to 16, characterized in that the closure body (3.1) has a diameter-enlarged lower end (3.11) which is preferably cylindrical.

18. Cistern according to one of claims 1 to 17, characterized in that the closure body (3.1) is provided at its lower end (3.11) with a seal (12) that is at least partially spherical or funnel-shaped.

19. Cistern according to one of claims 1 to 18, characterized in that the actuating device (15) has a mounting frame (15.1) on which an operating element (15.2) for actuating the flush valve (3) is movably mounted, wherein at least one spring (15.16) is integrally formed on the mounting frame (15.1), which returns the operating element (15.2) from an actuating position to a starting position after being released.

20. Cistern according to one of claims 1 to 19, characterized in that the actuating device (15) is provided with an adjusting device (18) for variably limiting the stroke of the flush valve (3).

21. Cistern according to claim 20, characterized in that the adjusting device (18) has a screw (18.1) for stepless adjustment of a movement range of a push plate functioning as an operating element (15.2).

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