EP3839157B1 - Drain fitting for a sanitary tub or shower tray - Google Patents

Description

The invention relates to a drain fitting for a sanitary tub or shower tray, with a drain housing having an inlet opening and a connection for a drain pipe, with a flange surrounding the inlet opening, which has a connection surface intended for arrangement in an edge region of a drain opening of the tub or shower tray, and with a cover, which is detachably connected to the flange and / or the drain housing and, in the assembled state, covers the inlet opening while delimiting an inlet gap, the flange, which is preferably annular, having a horizontal external dimension which is larger than a relative to Horizontal external dimension of the cover, which is the same as the external dimension of the flange. The flange is designed in such a way that it can be connected to the underside of the tub or shower tray without a connecting counterpart resting on the top of the tub or shower tray base. The flange and/or the drain housing has an inlet surface which is lower than the connecting surface of the flange and which, when the drain fitting is assembled, surrounds the inlet opening and is spaced from the underside of the cover, the cover having spacers on its underside with which it is on the inlet surface rests. The invention relates in particular to the use of such a drain fitting in combination with a sanitary tub or shower tray, the drain fitting being attached to a drain opening of the tub or shower tray.

Such a drain fitting is known (cf. WO 2010/083568 A2 ). There is also a similar drain fitting for a sanitary tub or shower tray DE 20 2008 001 013 U1 known.

A shower tray in the context of the present invention can also be referred to as a shower tray.

Conventional bathtubs and shower trays are made of steel enamel or fiber-reinforced plastic and have a trough or circumferential recess in an edge area of the drain opening of the tub or shower tray (see e.g. DE 10 2006 030 481 A1 ). The circumferential recess serves to fix a drain fitting using a connecting counterpart in the form of a flange. In the case of bathtubs and shower trays made of sheet steel, the circumferential recess is produced by forming, usually by embossing the edge area of the drain opening of the tub or shower tray. After forming the steel sheet and cutting it out, e.g. B. Punching out the drain opening - and if necessary cutting out an overflow opening - the tub or shower tray body is enamelled.

Especially with shower trays made of steel enamel, the circumferential recess in the edge area of the drain opening can usually only be achieved with relatively large bending radii. Because of the forming properties of sheet steel suitable for bathtubs or shower trays and the forming process, there is a need for material-dependent minimum bending radii. Relatively small bending radii, in particular angular contours at the drain opening and small drain gap dimensions, cannot or can hardly be produced using the usual forming process for tubs and shower trays made of steel enamel. The scope for the design of a tub and shower tray made of steel enamel is considerably limited due to the minimum radii required for production.

The DE 20 2018 104 241 U1 discloses a drain cover for a drain fitting intended for shower trays. The drain hood has a base body made of non-metallic material. A cover made of a metal or a metal alloy is releasably attached to the top of the base body. The drain fitting includes a drain housing with threaded sleeves cast into it for attaching the drain housing to the floor drain opening of the shower tray. Fastening screws are screwed into the threaded sleeves in order to connect a drain flange (mounting flange) located on the top of the shower tray base to the drain housing. For releasably attaching the drain hood to the assembled drain fitting, receptacles for the heads of the fastening screws are formed on the underside of the base body of the drain hood.

The DE 10 2012 215 761 A1 discloses a drain fitting for arrangement on a drain flange of a basin. The drain fitting comprises a drain bowl, a sealing element and a clamping device for clamping the sealing element against the drain flange of the basin, the drain bowl having a sealing element receptacle which, in the assembled state of the drain fitting, overlaps the sealing element at least in sections. To connect this drain fitting to the basin, it requires a special drain flange that protrudes downwards from the underside of the basin.

Proceeding from this, the invention is based on the object of creating a drain fitting of the type mentioned, which significantly expands the scope for the shape of the shower trays, particularly in shower trays made of steel enamel, and thereby allows the cover to be rotated about a vertical axis relative to the flange prevents or blocks the drain housing.

This task is solved by a drain fitting with the features specified in claim 1. Advantageous embodiments of the drain fitting according to the invention are specified in the subclaims referring back to claim 1.

The present invention is based on the idea of producing design parts of a bathtub or shower tray, in particular one made of steel enamel, in the area of the drain opening using flat components or base sections without a strong degree of deformation. All or almost all functional parts in the area of the drain opening should be arranged in the invisible area under the cover (drain hood) and thus hidden.

The drain fitting according to the invention is characterized in that the flange has a plurality of projections, with the spacers engaging in recesses delimited by the projections, or in that the inlet surface is delimited to the outside by a circumferential shoulder or a circumferential inner wall, with the shoulder or the Wall has a plurality of projections, and wherein the spacers engage in recesses delimited by the projections. This positive connection prevents or blocks the cover from rotating about a vertical axis relative to the flange and the drain housing.

The drain fitting according to the invention significantly expands the scope for the design of a shower tray, in particular a shower tray made of steel enamel. Because the drain fitting according to the invention does not require a circumferential recess in an edge region of the drain opening of the shower tray or tub in order to be fixed to a shower tray or tub. Rather, the drain fitting according to the invention offers the possibility of producing the design parts in the area of the drain opening of the shower tray or tub using flat components without a strong degree of deformation. All functional parts in the area of the drain opening can be arranged in the invisible area under the cover and thus hidden.

The top of the cover is typically clearly visible to an observer when the drain fitting is installed and in the intended state. The top of the cover can therefore also be referred to as a decorative top or is designed as a decorative top. The decorative top of the cover can be realized, for example, by a decorative plate arranged on the top of the cover. The top of the cover or decorative panel can be essentially flat or slightly curved upwards. In the When the drain fitting is assembled, as intended, the top of the cover or decorative plate and the top of the edge area of the sanitary tub or shower tray surrounding the drain opening are essentially level with the floor, preferably essentially flush with one another.

Preferably, the horizontal external dimension of the flange of the drain fitting according to the invention is at least 5%, preferably at least 10%, particularly preferably at least 15% larger than the horizontal external dimension of the cover, which is oriented in the same direction relative to the external dimension of the flange.

The drain opening of the shower tray or tub as well as the cover are preferably circular. The horizontal outside dimension specified above can then also be referred to as the horizontal outside diameter.

According to the invention, the flange and/or the drain housing has an inlet surface which is lower relative to the connecting surface of the flange and which, in the assembled state of the drain fitting, surrounds the inlet opening of the drain housing and is spaced from the underside of the cover. This allows functional parts of the drain fitting to be conveniently arranged under the cover and thus hidden. In particular, this configuration enables simple and functional storage and vertical positioning of the cover. For this purpose, the cover has spacers on its underside with which it rests on the inlet surface.

An advantageous embodiment of the drain fitting according to the invention is characterized in that a circumferential annular groove for receiving an annular seal, for example an annular elastomer seal, is formed in the connecting surface of the flange. The annular groove surrounds the inlet surface and is preferably arranged in the connection surface of the flange at a relatively small distance from the inlet surface, for example with a distance in the range of 2 mm to 15 mm, in particular in the range of 3 to 10 mm. One inserted into the ring groove The ring seal ensures a reliable liquid seal between the shower tray or tub and the drain fitting, especially when the connecting surface of the flange is subsequently glued to the underside of the tub or shower tray base. In particular, this configuration can ensure that the adhesive is effectively sealed from the water drain area of the drain fitting, so that shower or bath water cannot reach the adhesive.

According to a further advantageous embodiment of the drain fitting according to the invention, the connecting surface of the flange is connected in one piece to the inlet surface surrounding the inlet opening of the drain housing via a conical inlet surface. The conical inlet surface promotes the flow of water into the drain housing and largely prevents dirt from sticking to the inlet surface. Furthermore, the cover can be easily and reliably centered in the drain opening of the tub using the conical inlet surface. For this purpose, the spacers formed on the underside of the cover preferably have beveled edges on their outer sections, the respective beveled edge defining an angle relative to a horizontal plane which essentially corresponds to the angle of inclination of the conical inlet surface. In other words, the beveled edge of the spacer runs essentially parallel to the contour of the conical inlet surface.

Another advantageous embodiment of the drain fitting according to the invention is characterized in that the inlet surface, which is lower relative to the connecting surface of the flange, is designed to be inclined, preferably conical, towards the inlet opening of the drain housing. The inlet surface is limited to the outside by a circumferential shoulder or a circumferential inner wall. The inclined, preferably conical inlet surface facilitates the flow of water into the drain housing and largely prevents dirt from adhering to the inlet surface. The cover can also be easily attached to the surrounding shoulder or to the surrounding inner wall center reliably relative to the drain opening of the tub. For this purpose, the cover has, for example, a large number of spacers on its underside, for example rib-shaped or web-shaped spacers, which protrude radially beyond the outer edge of the cover. The outer end faces of the spacers abut against the circumferential shoulder or the circumferential inner wall or end with very little play relative to the shoulder or the inner wall. Furthermore, the spacers are preferably designed in such a way that their ends protruding radially beyond the outer edge of the cover or beyond the outer edge of a support of a decorative plate of the cover are inclined or stepped towards the outer end face. As a result, the spacers are barely visible through the inlet gap, which is an advantage for the aesthetic design of the inlet gap. However, this design also optimizes the drain performance of the drain fitting with a small width of the inlet gap.

The cover or the decorative panel attached to the carrier preferably has a closed or substantially closed top side. In the present context, a substantially closed top side means a top side which optionally has a single or multiple through-openings, whereby the surface area of the through-opening or through-openings in the total area of the top of the cover or decorative panel is a maximum of 2%.

A further advantageous embodiment of the drain fitting according to the invention is characterized in that on the inlet surface there is an annular shoulder for positively receiving a flange section of a fastening flange, in particular a screw flange is formed. As a result, the transition from the inlet surface to the fastening or screw flange can be carried out essentially flush with the surface, preferably without an upwardly projecting projection. This means that deposits at the transition from the inlet surface to the screw flange can be largely prevented.

According to a further embodiment of the invention, the inlet surface surrounding the inlet opening of the drain housing is connected to the drain housing by means of a screw flange. This configuration makes it possible to reduce the number of components of the drain fitting by using only a single screw flange instead of a fastening flange with several fastening screws and a corresponding number of threaded sleeves cast into the drain housing, which is screwed into an internal thread formed at the inlet opening of the drain housing.

The screw flange preferably has grip elements. The screw flange can thus be screwed into the internal thread formed at the inlet opening of the drain housing without tools. The grip elements are designed, for example, in the form of ribs which are arranged on the inside and/or the top of the screw flange. The screw flange has, for example, two, three or four such grip elements (ribs) that are evenly spaced from one another. Preferably, the ribs protrude radially from the inside of the screw flange and each have an end edge which arcs downwards from the upper end of the respective rib in the direction of the central axis of the screw flange.

A further advantageous embodiment of the drain fitting according to the invention is characterized in that the flange has a plurality of through holes in the area of its connection surface for receiving fasteners connected to the underside of the shower tray or tub or for anchoring adhesive. This allows a particularly reliable fixation of the drain fitting on the Shower tray or tub. The fasteners connected to the underside of the shower tray or tub can be, for example, screw bolts or locking bolts.

According to a further advantageous embodiment of the drain fitting according to the invention, the horizontal external dimension of the cover is, for example, at least 130 mm, preferably at least 150 mm, particularly preferably at least 180 mm. The drain opening of the shower tray or tub has a slightly larger external dimension than the cover. This allows a high drainage performance to be achieved with a relatively narrow inlet gap. The gap width (gap dimension) of the inlet gap is, for example, in the range from 1.0 mm to 2.5 mm, in particular approximately 2 mm. Preferably, the cover and the drain opening of the shower tray or tub are each circular. The then circular inlet gap is ideal from a flow perspective.

A further advantageous embodiment of the drain fitting according to the invention provides that the cover has an enamelled decorative plate on the top side. When installed, the cover gives a high-quality impression. The cover includes a support, on the top of which the decorative panel is arranged and is firmly connected to the support. The carrier, which is provided on the underside with the above-mentioned spacers, can be made inexpensively, for example from plastic. The enameled decorative panel has excellent hygiene properties. The color of the decorative plate can match the visible surface of the shower tray or tub, so that the shower tray or tub then has an inconspicuous, subtle design in the area of the drain opening.

According to a further embodiment, the support of the cover has on its underside a downwardly tapering liquid guide element, which is preferably designed in the form of a cone, truncated cone, hyperbolic cone or hyperbolic truncated cone, the tip or taper of the liquid guide element preferably entering the inlet opening of the drain housing protrudes.

A further advantageous embodiment of the drain fitting according to the invention is characterized in that several holes or receptacles for connecting adjustable feet, preferably height-adjustable adjustable feet, are formed on the underside of the flange. Using the adjustable feet, the base of the shower tray or tub can be optimally supported on a raw or screed floor at the installation site.

According to a further embodiment of the drain fitting according to the invention, the flange is detachably connected to the drain housing when the drain fitting is assembled. This design of the drain fitting is advantageous both in terms of production technology and in terms of assembly technology.

A further embodiment of the drain fitting according to the invention provides that a removable hair strainer is inserted into the inlet opening. This makes it possible to prevent blockages of an odor trap formed in the drain housing. The hair sieve preferably has a substantially cup or bowl-shaped shape and has a large number of small through openings. The small through openings are preferably designed to be gap-shaped. For cleaning the hair sieve, it is preferably provided with a handle, preferably a centrally arranged, button or peg-shaped handle, so that the hair sieve can be easily removed from the inlet opening for cleaning purposes and can be reinserted into the inlet opening after cleaning.

The drain housing of the drain fitting according to the invention preferably has a siphon or odor trap, for example a substantially S-shaped or wave-shaped drain channel.

As explained above, the present invention is particularly aimed at using the drain fitting according to the invention in combination with a sanitary tub or shower tray, the tub or shower tray being in has a drain opening at its base, wherein an edge region of the base extending away from the drain opening is essentially flat and/or has no circumferential embossing, and wherein the drain fitting rests on the drain opening without resting on the top of the tub or shower tray base Connection counterpart is connected to the underside of the tub or shower tray.

Fig. 1

einen Abschnitt einer Duschtasse mit einer erfindungsgemäßen Ablaufarmatur in einer ersten vertikalen Schnittansicht;

Fig. 1a

eine Ablaufarmatur gemäß Fig. 1 mit einem darin eingesetzten Haarsieb, wiederum in einer vertikalen Schnittansicht;

Fig. 2

den Abschnitt der Duschtasse mit der Ablaufarmatur aus Fig. 1 in einer zweiten vertikalen Schnittansicht, die rechtwinklig zu der ersten vertikalen Schnittansicht verläuft;

Fig. 3

den Abschnitt der Duschtasse mit der Ablaufarmatur aus den Figuren 1 und 2 in einer perspektivischen Draufsicht;

Fig. 4

den Abschnitt der Duschtasse mit der Ablaufarmatur aus den Figuren 1 und 2 in einer perspektivischen Unteransicht;

Fig. 5

einen Abschnitt einer Duschtasse mit einer erfindungsgemäßen Ablaufarmatur in einem weiteren Ausführungsbeispiel, in einer perspektivischen Unteransicht;

Fig. 6

eine Duschtasse mit einer erfindungsgemäßen Ablaufarmatur in einem weiteren Ausführungsbeispiel, in einer perspektivischen Draufsicht;

Fig. 7

die Duschtasse mit der Ablaufarmatur aus Fig. 6 in einer perspektivischen Unteransicht;

Fig. 8

die Ablaufarmatur aus Fig. 7, ohne Duschtasse, in einer Längsseitenansicht;

Fig. 9

die Ablaufarmatur aus Fig. 8 mit Duschtasse in einer vertikalen Schnittansicht;

Fig. 10

die Ablaufarmatur aus Fig. 8, ohne Duschtasse, in einer vertikalen Schnittansicht;

Fig. 11

die Ablaufarmatur aus Fig. 8, ohne Duschtasse, in Draufsicht;

Fig. 12

die Ablaufarmatur aus den Figuren 8 und 11 in einer perspektivischen Explosionsdarstellung;

Fig. 13

einen Duschtassenabschnitt mit einer erfindungsgemäßen Ablaufarmatur in einem weiteren Ausführungsbeispiel, in einer perspektivischen Unteransicht;

Fig. 14

die Ablaufarmatur aus Fig. 13, ohne Duschtasse, in einer Längsseitenansicht;

Fig. 15

die Ablaufarmatur aus Fig. 14 mit Duschtassenabschnitt in einer vertikalen Schnittansicht;

Fig. 16

die Ablaufarmatur aus Fig. 14, ohne Duschtasse, in einer vertikalen Schnittansicht;

Fig. 17

die Ablaufarmatur aus Fig. 14, ohne Duschtasse, in Draufsicht; und

Fig. 18

die Ablaufarmatur aus den Figuren 14 und 17 in einer perspektivischen Explosionsdarstellung.

The invention is explained in more detail below using a drawing showing several exemplary embodiments. Show it:

Fig. 1

a section of a shower tray with a drain fitting according to the invention in a first vertical sectional view;

Fig. 1a

a drain fitting in accordance with Fig. 1 with a hair sieve inserted therein, again in a vertical sectional view;

Fig. 2

the section of the shower tray with the drain fitting Fig. 1 in a second vertical sectional view that is perpendicular to the first vertical sectional view;

Fig. 3

Remove the section of the shower tray with the drain fitting Figures 1 and 2 in a perspective top view;

Fig. 4

Remove the section of the shower tray with the drain fitting Figures 1 and 2 in a perspective bottom view;

Fig. 5

a section of a shower tray with a drain fitting according to the invention in a further exemplary embodiment, in a perspective bottom view;

Fig. 6

a shower tray with a drain fitting according to the invention in a further exemplary embodiment, in a perspective top view;

Fig. 7

the shower tray with the drain fitting Fig. 6 in a perspective bottom view;

Fig. 8

the drain fitting Fig. 7 , without shower tray, in a long side view;

Fig. 9

the drain fitting Fig. 8 with shower tray in a vertical sectional view;

Fig. 10

the drain fitting Fig. 8 , without shower tray, in a vertical sectional view;

Fig. 11

the drain fitting Fig. 8 , without shower tray, top view;

Fig. 12

the drain fitting from the Figures 8 and 11 in a perspective exploded view;

Fig. 13

a shower tray section with a drain fitting according to the invention in a further exemplary embodiment, in a perspective bottom view;

Fig. 14

the drain fitting Fig. 13 , without shower tray, in a long side view;

Fig. 15

the drain fitting Fig. 14 with shower tray section in a vertical sectional view;

Fig. 16

the drain fitting Fig. 14 , without shower tray, in a vertical sectional view;

Fig. 17

the drain fitting Fig. 14 , without shower tray, top view; and

Fig. 18

the drain fitting from the Figures 14 and 17 in a perspective exploded view.

The drawing shows a section of the floor 1 of a shower tray D. Shower tray D, for example, is a shower tray made of steel enamel. The shower tray D has a drain opening 2, which is preferably circular. In contrast to conventional shower trays made of steel enamel, in which the edge area of the shower tray base surrounding the drain opening has a conical embossing that projects downwards relative to the underside of the base, the in Figures 1 to 5 Shower tray partially shown in the edge region 3 surrounding the drain opening 2 in a ring shape, which extends away from the drain opening 2, does not have any embossing.

The top of the shower tray disclosed here is thus essentially flat in an edge region 3 surrounding the drain opening 2, which has a circumferential or radial edge width of at least 50 mm, preferably at least 80 mm. However, the top or bottom 1 of the shower tray D is preferably slightly inclined towards the drain opening 2, so that water on the floor 1 flows away towards the drain opening 2. The angle of inclination of the bottom top of the shower tray relative to the horizontal is, for example, in a range of 1° to 5°, preferably in the range of 1° to 3°.

The drain opening 2 of the shower tray D is produced, for example, by laser cutting or punching. The drain opening 2 is relatively sharp-edged and delimited by a hole edge 2.1, which has an edge radius in the range of approximately 0.25 mm to 1.25 mm, preferably in the range of approximately 0.5 mm to 1.0 mm.

An annular flange 4 is arranged on the underside of the shower tray D and surrounds the drain opening 2. The flange 4 is assigned to a drain fitting 5 or is part of a drain fitting 5. The flange 4 can also be referred to as an adapter flange. It has a connection surface 4.1 intended for placement on the underside of the shower tray.

The flange 4 is designed in such a way that it can be connected to the shower tray D in a liquid-tight manner without a connecting counterpart resting on the top of the shower tray base 1. In the in the Figures 1 to 4 In the exemplary embodiment shown, the flange 4 is cohesively connected to the shower tray. The cohesive connection can be achieved, for example, by applying adhesive all around the annular connection surface 4.1 or by using a double-sided adhesive ring.

The drain fitting 5 comprises a drain housing 9 which has an inlet opening 6 and a connection 7 for a drain pipe 8. Furthermore, the drain fitting 5 comprises a cover 10. The cover 10 is detachably connected to the flange 4 and/or the drain housing 9 and covers it when installed State the inlet opening 6 of the drain housing 9 with the limitation of an inlet gap 11. The flange 4 has a horizontal external dimension or an external diameter A1, which is significantly larger than a horizontal external dimension (e.g. external diameter A2) of the cover 10 that is aligned in the same direction relative to the external dimension of the flange. For example, the horizontal external dimension or the outer diameter A1 is at least 5%, preferably at least 15% larger than the horizontal outer dimension (e.g. outer diameter A2) of the cover 10, which is aligned relative to the outer dimension of the flange.

The flange 4 has a lower inlet surface 4.2 relative to its connection surface 4.1, which, in the assembled state of the drain fitting 5, surrounds the inlet opening 6 of the drain housing 9 and is spaced from the underside of the Cover 10 lies. The connection surface 4.1 of the flange is connected in one piece to the inlet surface 4.2 surrounding the inlet opening 6 of the drain housing via a conical inlet surface 4.3. The cover 10 has spacers 12 on its underside, with which it rests on the inlet surface 4.2.

The cover 10 preferably has an enameled decorative panel 10.1 on the top side. The decorative panel 10.1 is attached, for example glued, to a support 10.2 having the spacers 12. The carrier 10.2 with the downwardly projecting spacers 12 can be made inexpensively from plastic.

The spacers 12 are dimensioned so that the top of the decorative plate 10.1 of the cover 10 and the top of the edge region 3 of the shower tray surrounding the drain opening 2 are level with each other, preferably flush with each other. The cover 10 or the decorative plate 10.1 is preferably slightly curved upwards.

The drain opening 2 of the shower tray and the cover 10 are relatively large. For example, the horizontal external dimension or the external diameter of the decorative panel 10.1 of the cover 10 is at least 130 mm, preferably at least 150 mm, particularly preferably at least 180 mm. The drain opening 2 and the cover 10 delimit a circumferential top-side inlet gap 11.1, which has a gap width, for example, in the range of approximately 1.0 mm to 4 mm, preferably in the range of approximately 1.5 mm to 2.5 mm.

The drain housing 9 has a cup-shaped housing section 9.1, which is adjoined laterally by a substantially S-shaped or wave-shaped drain channel 9.2. The drain channel 9.2 is shaped in such a way that it has an overflow edge 9.3, which is significantly higher than a lower inlet edge 9.4, which is formed at the transition from the cup-shaped housing section 9.1 into the drain channel 9.2. The vertical distance between the lower inlet edge 9.4 and the overflow edge 9.3 following in the direction of flow defines a sealing water height and is for example approx. 50 mm. Water present in the wave-shaped drain channel 9.2 acts as a sealing water and serves as an odor trap. The drain channel 9.2 has a flat channel cross-section between the lower inlet edge 9.4 and the overflow edge 9.3, the width B or horizontal internal dimension of which is a multiple of the channel height H measured orthogonally relative thereto (cf. Figures 1 , 1a and 2 ). The width B of the drain channel 9.2 essentially corresponds to that in Fig. 1 shown largest inner width (inner diameter) of the cup-shaped housing section 9.1.

The connection 7 for a drain pipe 8, which follows the overflow edge 9.3 of the drain channel in the flow direction, is preferably designed as a circular cylindrical connecting piece. A drain pipe 8, for example in the form of a pipe angle, is inserted into the connection 7. An external thread is formed on the outer circumference of the connection 7, onto which a union nut 14 comprising a sealing ring 13 is screwed for the non-positive connection of the drain pipe 8.

The drain housing 9 can preferably be detachably mounted on the flange (adapter flange) 4. The detachable connection is designed, for example, as a screw connection. For example, vertically extending threaded sleeves 15 are integrated into the wall of the cup-shaped housing section 9.1, into which fastening screws are screwed. The fastening screws are inserted into fastening holes which are arranged evenly spaced apart on a partial circle which surrounds the through opening 4.5 defined by the flange 4, through which water draining from the shower tray base 1 flows into the drain housing 9. The fastening holes are formed in the flange 4 or an additional fastening flange that can be inserted into the flange 4 that is connected or connectable to the shower tray. The diameter of these mounting holes is smaller than the diameter of the head of the mounting screws inserted therein. The spacers 12 of the cover include recesses 16, which form the positive reception of the opposite Inlet surface 4.2 of the flange serves as the heads of the fastening screws protruding upwards.

The cup-shaped housing section 9.1 of the drain housing has an annular connection surface on its top, on which a sealing ring 17 made of elastomer lies. The flange 4 has on its underside a rib structure 4.6 facing the sealing ring 17. The rib structure 4.6 can, for example, comprise a plurality of annular, radially spaced, coaxially arranged ribs which press sealingly into the elastic sealing ring 17 after the flange 4 and drain housing 9 have been connected.

A hair sieve 18 can be arranged below the removable cover 10. The hair sieve 18 is preferably inserted into the inlet opening 6 of the drain housing 9 in a removable manner. For this purpose, the hair sieve 18 is preferably provided with a cone-shaped, centrally arranged handle 19 (cf. Fig. 1a ).

This in Fig. 5 The illustrated embodiment differs from that in the Figures 1 to 4 shown embodiment in that the flange 4 in the area of its connection surface 4.1 has several through holes 4.7 for receiving fasteners 20 connected to the underside of the shower tray base 1. The fastening centers 20 are, for example, screw bolts connected to the underside of the shower tray D, onto which fastening nuts are screwed. The flange 4 can therefore alternatively or additionally also be non-positively connected to the shower tray D.

According to a further exemplary embodiment, not shown, the through holes 4.7 of the flange 4 can also be used to anchor adhesive arranged between the underside of the shower tray base 1 and the connection surface 4.1 of the flange 4.

In the Figures 6 to 12 a further exemplary embodiment of the invention is shown. Especially in the Figures 6 and 7 a shower tray D is shown which is particularly flat, with the bottom 1 of the shower tray D being designed with a slight gradient from the outer edges towards the drain opening 2. The angle of inclination of the slope is, for example, in the range of 1° to 3°. The drain opening 2 is circular, for example.

In contrast to conventional shower trays, in which the edge area of the shower tray base surrounding the drain opening has a conical embossing that projects downwards relative to the underside of the base, the in Figures 6 , 7 and 9 Shower tray D shown in the edge region 3 immediately surrounding the drain opening 2, the radial edge width of which is, for example, at least 80 mm, does not have any downwardly projecting embossing. Rather, the edge region 3 surrounding the drain opening 2 is essentially flat.

A flange 4 is attached to the underside of the shower tray D in the area of the drain opening 2. The flange 4 is part of a drain fitting 5 and has an annular connection surface 4.1 intended for connection to the underside of the shower tray base 1 (cf. Fig. 10 , 11 and 12 ).

The flange 4 is in turn designed in such a way that it can be connected to the shower tray D in a liquid-tight manner without a connecting counterpart resting on the top of the shower tray base 1. In the exemplary embodiment according to Fig. 6 to 12 The flange 4 is or will be cohesively connected to the underside of the shower tray base 1. The cohesive, liquid-tight connection can be achieved, for example, by applying adhesive in a ring shape to the connection surface 4.1 or by using a double-sided adhesive ring.

The flange 4 is preferably designed as a molded part and made of plastic or metal. On the underside of the flange 4 there are reinforcing ribs 4.81, 4.82 formed, which include, for example, a central, annular reinforcing rib 4.81 and a plurality of radially extending reinforcing ribs 4.82.

Furthermore, several holes or receptacles 4.85 are formed on the underside of the flange 4 for connecting height-adjustable feet. Using the adjustable feet, the floor 1 of the shower tray D or tub can be supported on a raw or screed floor at the installation site.

The drain fitting 5 has a drain housing 9, which has an inlet opening 6 and a connection 7 for a drain pipe. The drain fitting 5 also includes a cover 10. The cover 10 is detachably connected to the flange 4 or the drain housing 9 and, in the assembled state, covers the inlet opening 6 of the drain housing 9, delimiting an inlet gap 11. The flange 4 has a horizontal external dimension or an external diameter A1, which is significantly larger than the external diameter A2 of the cover 10 or a horizontal external dimension of the cover 10 that is aligned in the same direction relative to the external dimension of the flange. For example, the horizontal external dimension or the external diameter is A1 at least 10%, preferably at least 20% larger than the outer diameter A2 of the cover 10 or a horizontal outer dimension of the cover 10 that is aligned in the same direction relative to the outer dimension of the flange 4.

The flange 4 defines a lower inlet surface 4.2 relative to the connection surface 4.1, which surrounds the inlet opening 6 of the drain housing 9 in the assembled state of the drain fitting 5 and is spaced from the underside of the cover 10. The cover 10 is provided on its underside with spacers 12 with which it rests on the inlet surface 4.2.

A circumferential annular groove 4.30 for receiving an annular seal 26 is formed in the connection surface 4.1 of the flange 4. The ring groove 4.30 surrounds it Inlet surface 4.2 and is preferably arranged in the connection surface 4.1 of the flange 4 at a relatively small distance from the inlet surface 4.2, for example with a distance in the range of 2 mm to 15 mm.

The inlet surface 4.2, which is lower relative to the connection surface 4.1, is inclined, preferably conical, towards the inlet opening 6 of the drain housing. The inlet surface 4.2 is limited to the outside by a circumferential shoulder or a circumferential inner wall 4.9. The inlet surface 4.2, which is designed with a slope, promotes the flow of water into the drain housing 9.

Also in the in the Figures 6 and 9 In the exemplary embodiment shown, the cover 10 has a decorative plate 10.1. The preferably enameled decorative panel 10.1 is in turn attached to a support 10.2 which has the spacers 12 and which can be made inexpensively from plastic.

The cover 10 can be centered on the circumferential wall 4.9 of the flange 4 relative to the drain opening 2 of the shower tray D. For this purpose, the spacers 12 are, for example, rib-shaped or web-shaped and protrude radially beyond the outer edge of the cover 10. At least some of the spacers 12 abut with their outer end faces 12.1 against the circumferential shoulder or the circumferential wall 4.9. Furthermore, the spacers 12 are designed, for example, in such a way that their ends protruding radially beyond the outer edge of the carrier 10.2 of the decorative plate 10.1 of the cover 10 are inclined towards the outer end face 12.1.

Especially based on the Figures 9 , 10 and 12 It can be seen that the circumferential shoulder or the circumferential inner wall 4.9 has a large number of projections 4.10, with the spacers 12 engaging in recesses 4.11 delimited by the projections 4.10. This positive connection prevents or blocks the cover 10 from rotating about a vertical axis relative to the flange 4.

The cover 10 or the carrier 10.2 of the cover has a tapered liquid guide element 10.3 on the underside, which is designed, for example, in the form of a hyperbolic cone or hyperbolic truncated cone, the tip or taper of the liquid guide element 10.3 protruding into the inlet opening 6 of the drain housing 9.

To connect the flange 4 and the drain housing 9, the flange 4 has a cylindrical receptacle 4.12, into which a cylindrical connecting piece 9.5 formed on the drain housing 9 is or is inserted. The receptacle 4.12 is defined by an inner cylindrical ring web 4.13 of the flange 4. The connecting piece 9.5 has ribs or annular grooves 9.6 running parallel to one another on its outside, into which, for example, a sealing ring (O-ring) can be inserted. At the upper end of the receptacle 4.12 there is a circumferential, radially inwardly projecting projection 4.14, which serves as an axial stop for the connecting piece 9.5 (cf. Fig. 9 and 12 ).

Furthermore, to connect the flange 4 and the drain housing 9, a screw flange 21 is provided, by means of which the inlet surface 4.2 of the flange 4 is or will be connected to the drain housing 9. For this purpose, the connecting piece 9.5 of the drain housing 9 has an internal thread 9.7 into which the screw flange 21 is screwed. An annular shoulder 4.21 is formed on the inlet surface 4.2 for the form-fitting reception of the flange section 21.1 of the screw flange 21.

The screw flange 21 is provided with handle elements 21.2. The handle elements 21.2 enable the screw flange 21 to be screwed without tools into the internal thread 9.7 formed at the inlet opening 6 of the drain housing 9. The handle elements 21.2 are designed, for example, in the form of ribs and are arranged on the inside of the screw flange 21. The ribs 21.2 preferably protrude radially from the inside of the screw flange 21 and have end edges which from the upper end of the respective rib 21.2 in the direction of the central axis of the screw flange 21 run arcuately downwards.

The dimensions of the drain opening 2, the cover 10, in particular the decorative plate 10.1, the inlet gap 11.1 and the gap width correspond to those above with reference to those in the Figures 1 to 5 Dimensions shown in the exemplary embodiments shown, so that reference is made to the above description to avoid repetition.

The same applies with regard to the S-shaped or wave-shaped design of the drain channel 9.2 of the drain housing 9. The drain housing 9 is essentially composed of a lower housing part 9 'and an upper housing part 9", which are or are glued or welded together (cf. Fig. 12 ).

That in the Figures 13 to 18 The illustrated embodiment differs from that in the Figures 6 to 12 shown embodiment in the connection of flange 4 and drain housing 9. Similar to that in Figures 1 to 5 The exemplary embodiment shown is also in the one in the Figures 7 to 18 shown embodiment threaded sleeves 15 integrated in the wall of the cup-shaped housing section 9.1, into which fastening screws 23 are screwed. The fastening screws 23 are combined with a fastening flange 24 which has fastening holes for inserting the fastening screws 23. The fastening holes are provided, for example, in radially inwardly projecting ears 24.2 of the fastening flange 24, which is preferably made of stainless steel. The fastening screws 23 are countersunk screws. Accordingly, the fastening holes of the fastening flange 24 are essentially conical.

The cup-shaped housing section 9.1 of the drain housing again has an annular connection surface 9.5' on its upper side, on which a sealing ring 17 made of elastomer lies. The flange 4 has one on its underside the sealing ring 17 facing contact surface 4.6 '. The contact surface 4.6' can be essentially smooth or in the form of a rib structure, for example a rib structure 4.6 according to Fig. 1a , be trained.

On the inlet surface 4.2 of the flange 4 is similar to the embodiment according to Fig. 9 and 12 an annular shoulder 4.21 is designed to positively accommodate a flange section 24.1 of the fastening flange 24.

The cover 10 is again provided with spacers 12 on its underside, with which it rests on the inlet surface 4.2 of the flange. The spacers 12 are rib-shaped or web-shaped and protrude beyond the outer edge of the cover 10. At least some of the spacers 12 abut with their outer end faces 12.1 the circumferential shoulder or the circumferential wall 4.9 of the flange. The spacers 12 are, for example, designed in such a way that their ends protruding radially beyond the outer edge of the carrier 10.2 of the decorative plate 10.1 of the cover have a step-shaped reduced height towards the outer end face 12.1. In contrast to that in the Figures 6 to 12 The example shown is the spacers 12 according to Fig. 18 wider and define a comparatively coarse star-shaped spoke structure with larger recesses between the spokes or spacers 12.

The Figures 15 , 16 and 18 show that the circumferential inner wall 4.9 of the flange has a plurality of projections 4.10, and that the spacers 12 engage in recesses 4.11 delimited by the projections 4.10. This positive connection prevents or blocks the cover 10 from rotating about a vertical axis relative to the flange 4.

The dimensions of the drain opening 2, the cover 10, the decorative plate 10.1, the inlet gap 11.1 and the gap width correspond to that in the Figures 13 to 18 The exemplary embodiment shown also corresponds to the dimensions already given above with reference to the other exemplary embodiments, so that to avoid this of repetitions, particularly in the description of the Figures 1 to 5 is referred.

The same applies with regard to the S-shaped or wave-shaped design of the drain channel 9.2 of the drain housing 9 and with regard to the structure of the drain housing 9 from a lower housing part 9 'and an upper housing part 9", which are or will be glued or welded together.

The implementation of the invention is not limited to the exemplary embodiments shown in the drawing. Rather, numerous variants are possible which make use of the invention specified in the appended claims even in an embodiment that deviates from the examples shown. For example, the drain opening 2 of the shower tray D and the cover 10 can also be rectangular, in particular square, or oval.

Claims (12)

1. Drain fitting for a sanitary tub or shower tray (D),

   with a drain housing (9) having an inlet opening (6) and a connection (7) for a drain pipe,

   with a flange (4) surrounding the inlet opening (6), which has a connection surface (4.1) intended for arrangement in an edge region (3) of a drain opening (2) of the tub or shower tray, and

   with a cover (10), which is detachably connected to the flange (4) and/or the drain housing (9) and, in the assembled state, covers the inlet opening (6) while limiting an inlet gap (11), wherein the flange (4) has a horizontal outer dimension (A1) which is larger than a horizontal outer dimension (A2) of the cover (10) which is aligned in the same direction relative to the outer dimension (A1) of the flange (4), the flange (4) being designed in such a way that it can be connected to the underside of the tub base or shower tray base (1) in a liquid-tight manner without a connecting counterpart resting against the upper side of the tub or shower base, the flange (4) and/or the drain housing (9) having an inlet surface (4.2) which is lower relative to the connection surface (4.1) of the flange (4), surrounds the inlet opening (6) of the drain housing (9) in the assembled state of the drain fitting (5) and is at a distance from the underside of the cover (10), and wherein the cover (10) has spacers (12) on its underside, with which it rests on the inlet surface (4.2),

   characterized in that the flange (4) has a plurality of projections (4.10), the spacers (12) engaging in recesses (4.11) delimited by the projections (4.10), or in that the inlet surface (4.2) is bounded on the outside by a circumferential shoulder or a circumferential inner wall (4.9), the shoulder or the wall (4.9) having a plurality of projections (4.10), and the spacers (12) engaging in recesses (4.11) bounded by the projections (4.10).
2. Drain fitting according to claim 1, characterized in that the horizontal outer dimension (A1) of the flange (4) is at least 5%, preferably at least 10%, particularly preferably at least 15% larger than the horizontal outer dimension (A2) of the cover (10), which is aligned in the same direction relative to the outer dimension (A1) of the flange (4).
3. Drain fitting according to claim 1 or 2, characterized in that a circumferential annular groove (4.30) for receiving an annular seal (26) is formed in the connecting surface (4.1) of the flange (4).
4. Drain fitting according to any one of claims 1 to 3, characterized in that the connection surface (4.1) of the flange (4) is connected in one piece via a conical inlet surface (4.3) to the inlet surface (4.2) surrounding the inlet opening (6) of the drain housing (9).
5. Drain fitting according to any one of claims 1 to 4, characterized in that the inlet surface (4.2) is inclined, preferably conical, towards the inlet opening (6) of the drain housing (9).
6. Drain fitting according to any one of claims 1 to 5, characterized in that an annular shoulder (4.21) is formed on the inlet surface (4.2) for the form-fitting reception of a flange section (21.1) of a fastening flange, in particular a screw flange (21).
7. Drain fitting according to any one of claims 1 to 6, characterized in that the inlet surface (4.2) is connected to the drain housing (9) by means of a screw flange (21).
8. Drain fitting according to any one of claims 1 to 7, characterized in that the flange (4) has a plurality of through-holes (4.7) in the region of its connection surface (4.1) for receiving fasteners (20) connected to the underside of the shower tray (D) or tub or for anchoring adhesive.
9. Drain fitting according to any one of claims 1 to 8, characterized in that the horizontal outer dimension of the cover (10) is at least 130 mm, preferably at least 150 mm, particularly preferably at least 180 mm.
10. Drain fitting according to any one of claims 1 to 9, characterized in that the cover (10) has an enamelled decorative plate (10.1) on the top.
11. Drain fitting according to any one of claims 1 to 10, characterized in that one or more receptacles (4.85) for connecting one or more adjustable feet are formed on the underside of the flange (4).
12. Use of the drain fitting (5) according to any one of claims 1 to 11 in combination with a sanitary tub or shower tray (D), wherein the tub or shower tray (D) has a drain opening (2) in its base (1), wherein an edge region (3) of the base (1) extending away from the drain opening (2) is substantially flat and/or has no circumferential embossing, and wherein the drain fitting (5) at the drain opening (2) is connected to the underside of the tub or shower tray (D) without a connecting counterpart resting against the upper side of the tub or shower tray base (1).

Images