Drain fitting for a sanitary bathtub or shower tray

Abstract

Drain fitting for a sanitary bathtub 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 area (3) of a drain opening (2) of the bathtub or shower tray, and with a cover (10) which is detachably connected to the flange (4) and / or the drain housing (9) and, when installed, 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 with the outer dimension (A1) of the flange (4), wherein the flange (4) is designed such that it can be connected to the underside of the tub or shower tray in a liquid-tight manner without a connecting counterpart abutting the top of the tub or shower tray base (1), wherein the flange (4) has an inlet surface (4.2) that is lower relative to the connection surface (4.1) of the flange (4), which in the installed state of the drain fitting (5) surrounds the inlet opening (6) of the drain housing (9) and is spaced apart from the underside of the cover (10), wherein an annular shoulder (4.21) is formed on the inlet surface (4.2) for the positive locking reception of a flange section (21.1) of a screw flange (21), and wherein the inlet surface (4.2) is connected to the drain housing (9) by means of the screw flange (21).

Description

[0001] The invention relates to a drain fitting for a sanitary bathtub or shower tray, comprising a drain body having an inlet opening and a connection for a drain pipe, a flange surrounding the inlet opening which has a connection surface intended for arrangement in an edge area of ​​a drain opening of the bathtub or shower tray, and a cover which is detachably connected to the flange and / or the drain body and, in the assembled state, covers the inlet opening while limiting an inlet gap.

[0002] Such drain fittings are known (see, e.g., DE 20 2008 001 013 U1).

[0003] A shower tray in the context of the present invention can also be referred to as a shower base.

[0004] Conventional bathtubs and shower trays are made of enamelled steel or fiber-reinforced plastic and feature a recess or circumferential indentation around the drain opening (see, e.g., DE 10 2006 030 481 A1). This circumferential indentation serves to secure a drain fitting by means of a connecting piece in the form of a flange. In the case of bathtubs and shower trays made of sheet steel, the circumferential indentation is produced by forming, usually by embossing, the edge of the drain opening. After forming the sheet steel and cutting out the opening—e.g., punching out the drain opening—and, if necessary, cutting out an overflow opening, the bathtub or shower tray body is enamelled.

[0005] Especially with steel enamel shower trays, the circumferential recess around the drain opening can generally only be achieved with relatively large bending radii. This is because the forming properties of steel sheet suitable for bathtubs or shower trays, and the forming process itself, necessitate material-dependent minimum bending radii. Relatively small bending radii, particularly sharp contours around the drain opening and narrow drain gaps, cannot be produced, or can only be produced with great difficulty, using the standard forming process for steel enamel bathtubs and shower trays. The design possibilities for steel enamel bathtubs and shower trays are therefore significantly limited by these manufacturing-related minimum radii.

[0006] DE 10 2012 215 764 A1 describes a sieve element for a drain of a basin comprising a base body with at least one sieve opening and a multi-part handle, wherein the handle comprises a handle top part and a handle bottom part connected to the handle top part.

[0007] EP 2 258 905 A1 relates to a drain, in particular for sanitary installations, with a housing, wherein an inlet channel and a drainage collection channel are formed inside the housing, which are separated from each other by a backwater area to form a siphon.

[0008] Based on this, the invention aims to create a drain fitting of the type mentioned at the outset, which significantly expands the scope for the design of shower trays, particularly in the case of steel enamel shower trays.

[0009] This problem 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 dependent claims referring back to claim 1.

[0010] The present invention is based on the idea of ​​manufacturing design elements of a bathtub or shower tray, particularly one made of steel enamel, in the area of ​​the drain opening using flat components or base sections without a high degree of deformation. All or nearly all functional parts in the area of ​​the drain opening are to be arranged in the non-visible area under the cover (drain cover) and thus concealed.

[0011] The drain fitting according to the invention is characterized in that the flange, which is preferably ring-shaped, has a horizontal outer dimension which is larger than a horizontal outer dimension of the cover which is aligned with the outer dimension of the flange, wherein 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 floor.

[0012] The drain fitting according to the invention significantly expands the design possibilities for shower trays, particularly those made of steel enamel. This is because the drain fitting according to the invention does not require a circumferential recess in the edge area of ​​the drain opening of the shower tray or bathtub for its attachment. Instead, the drain fitting according to the invention offers the possibility of manufacturing the design elements in the area of ​​the drain opening of the shower tray or bathtub using flat components without a high degree of forming. All functional parts in the area of ​​the drain opening can be arranged in the non-visible area under the cover and thus concealed.

[0013] Preferably, the horizontal outer dimension of the flange of the drain fitting according to the invention is larger by at least 5%, preferably by at least 10%, particularly preferably by at least 15% than the horizontal outer dimension of the cover hood which is aligned with the outer dimension of the flange.

[0014] The drain opening of the shower tray or bathtub, as well as the cover, are preferably circular. The horizontal outer dimension specified above can then also be referred to as the horizontal outer diameter.

[0015] The flange has an inlet surface that is recessed relative to the flange's connection surface. When the drain fitting is installed, this inlet surface surrounds the inlet opening of the drain body and is spaced apart from the underside of the cover. This allows functional components of the drain fitting to be conveniently arranged and thus concealed beneath the cover. In particular, this design enables simple and functional storage and vertical positioning of the cover. For this purpose, the cover preferably has spacers on its underside that allow it to rest on the inlet surface.

[0016] The flange's connection surface features a circumferential annular groove for receiving a ring seal, such as an annular elastomer seal. The annular groove surrounds the inlet surface and is preferably positioned relatively close to it, for example, at a distance of 2 mm to 15 mm, and particularly at a distance of 3 mm to 10 mm. A ring seal inserted into the annular groove ensures a reliable liquid seal between the shower tray or bathtub and the drain fitting, especially when the flange's connection surface is subsequently bonded to the underside of the bathtub or shower tray base. This design, in particular, ensures that the adhesive is effectively sealed against the drain area of ​​the drain fitting, preventing shower or bath water from reaching the adhesive.

[0017] In a further advantageous embodiment of the drain fitting according to the invention, the connection surface of the flange is integrally connected to the inlet surface surrounding the inlet opening of the drain housing via a conical inlet surface. The conical inlet surface facilitates the flow of water into the drain housing and largely prevents dirt from adhering to the inlet surface. Furthermore, the cover can be easily and reliably centered in the drain opening of the tub by means of the conical inlet surface. For this purpose, the spacers formed on the underside of the cover preferably have chamfered edges on their outer sections, with each chamfered edge defining an angle relative to a horizontal plane that 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.

[0018] Another advantageous embodiment of the drain fitting according to the invention is characterized in that the inlet surface, which is lower relative to the connection surface of the flange, is inclined, preferably conically, towards the inlet opening of the drain housing. The inlet surface is bounded externally 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 and reliably centered relative to the drain opening of the tub on the circumferential shoulder or the circumferential inner wall. For this purpose, the cover has, for example, a plurality of spacers on its underside, such as rib- or rib-shaped spacers, which project radially beyond the outer edge of the cover.The outer end faces of the spacers abut the surrounding shoulder or inner wall, or terminate with very little clearance relative to the shoulder or inner wall. Furthermore, the spacers are preferably designed such that their ends, which project radially beyond the outer edge of the cover or beyond the outer edge of a support for a decorative panel of the cover, are inclined or stepped towards the outer end face. This makes the spacers barely visible through the inlet gap, which is advantageous for the aesthetic design of the inlet gap. However, this design also optimizes the drainage capacity of the drain fitting when the inlet gap is narrow.

[0019] The cover or the decorative panel mounted on the carrier preferably has a closed or substantially closed top surface. In this context, a substantially closed top surface means a top surface that optionally has one or more through-openings, wherein the area of ​​the through-opening(s) is a maximum of 2% of the total area of ​​the top surface of the cover or decorative panel.

[0020] A further advantageous embodiment of the drain fitting according to the invention provides that the flange has a plurality of projections, wherein the spacers engage in recesses bounded by the projections. For example, the inlet surface is bounded to the outside by a circumferential shoulder or a circumferential inner wall, wherein the shoulder or wall has a plurality of projections, and wherein the spacers engage in recesses bounded by the projections. This positive-locking connection prevents or locks the cover from rotating about a vertical axis relative to the flange and the drain housing.

[0021] The inlet surface features an annular shoulder for the positive-locking engagement of a flange section of a bolted flange. This allows the transition from the inlet surface to the mounting or bolted flange to be essentially flush, preferably without an upward-projecting protrusion. This largely prevents deposits from accumulating at the transition between the inlet surface and the bolted flange.

[0022] The inlet surface surrounding the drain housing's inlet opening is connected to the drain housing by means of a screw flange. This design allows for a reduction in the number of components of the drain fitting, as instead of a mounting flange with multiple mounting screws and a corresponding number of threaded inserts cast into the drain housing, only a single screw flange is used, which is screwed into an internal thread formed on the drain housing's inlet opening.

[0023] Preferably, the screw flange has gripping elements. This allows the screw flange to be screwed into the internal thread formed at the inlet opening of the drain housing without tools. The gripping elements are, for example, in the form of ribs arranged on the inside and / or the top of the screw flange. The screw flange has, for example, two, three, or four such gripping elements (ribs) that are evenly spaced apart. Preferably, the ribs project radially from the inside of the screw flange and each has a leading edge that curves downwards from the upper end of the respective rib in the direction of the central axis of the screw flange.

[0024] A further advantageous embodiment of the drain fitting according to the invention is characterized in that the flange has several through-holes in the area of ​​its connection surface for receiving fastening elements connected to the underside of the shower tray or bathtub, or for anchoring adhesive. This allows for a particularly reliable fixation of the drain fitting to the shower tray or bathtub. The fastening elements connected to the underside of the shower tray or bathtub can be, for example, screw bolts or locking bolts.

[0025] According to a further advantageous embodiment of the drain fitting according to the invention, the horizontal outer dimension of the cover is, for example, at least 130 mm, preferably at least 150 mm, and particularly preferably at least 180 mm. The drain opening of the shower tray or bathtub has a slightly larger outer dimension than the cover. This allows for high drainage capacity with a relatively narrow inlet gap. The gap width (gap dimension) of the inlet gap is, for example, in the range of 1.0 mm to 2.5 mm, particularly around 2 mm. Preferably, the cover and the drain opening of the shower tray or bathtub are each circular. The resulting circular inlet gap is ideal from a fluid dynamics perspective.

[0026] A further advantageous embodiment of the drain fitting according to the invention provides that the cover has an enamelled decorative panel on its upper surface. When installed, the cover thus conveys a high-quality impression. The cover comprises a support on the upper surface of which the decorative panel is arranged and firmly connected. The support, which is provided with the aforementioned spacers on its underside, can be made cost-effectively, for example, from plastic. The enamelled decorative panel has excellent hygienic properties. The decorative panel can match the color of the visible surface of the shower tray or bathtub, so that the shower tray or bathtub then has an unobtrusive, discreet design in the area of ​​the drain opening.

[0027] According to a further embodiment, the carrier of the cover hood has on its underside a downwardly tapered liquid guiding element, which is preferably designed in the form of a cone, truncated cone, hyperbolic cone or hyperbolic truncated cone, wherein the tip or taper of the liquid guiding element preferably projects into the inlet opening of the drain housing.

[0028] A further advantageous embodiment of the drain fitting according to the invention is characterized in that several holes or receptacles for attaching adjustable feet, preferably height-adjustable feet, are provided on the underside of the flange. The adjustable feet allow the base of the shower tray or bathtub to be optimally supported on a bare concrete or screed floor at the installation site.

[0029] In 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 installed. This embodiment of the drain fitting is advantageous both in terms of manufacturing and assembly.

[0030] A further embodiment of the drain fitting according to the invention provides that a removable hair strainer is inserted into the inlet opening. This prevents blockages of a trap formed in the drain housing. The hair strainer preferably has a substantially cup- or bowl-shaped form and features a plurality of small openings. Preferably, the small openings are slit-shaped. For cleaning the hair strainer, it is preferably provided with a handle, preferably a centrally located, knob- or pin-shaped handle, so that the hair strainer can be easily removed from the inlet opening for cleaning purposes and reinserted into the inlet opening after cleaning.

[0031] The invention is explained in more detail below with reference to a drawing illustrating several exemplary embodiments. The drawing shows: Fig. 1 a section of a shower tray with a drain fitting in a first vertical sectional view; Fig. 1a a drain fitting according to Fig. 1 with a hair strainer inserted therein, again in a vertical sectional view; Fig. 2. Remove the section of the shower tray with the drain fitting. Fig. 1 in a second vertical section view, which runs perpendicular to the first vertical section view; Fig. 3. Remove the section of the shower tray with the drain fitting from the Fig. 1 and Fig. 2 in a perspective top view; Fig. 4. Remove the section of the shower tray with the drain fitting from the Fig. 1 and Fig. 2 in a perspective bottom view; Fig. 5 a section of a shower tray with a drain fitting in a further embodiment, in a perspective bottom view; Fig. 6 a shower tray with a drain fitting according to the invention in a further embodiment, in a perspective top view; Fig. 7. Remove 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 longitudinal side view; Fig. 9 the drain fitting Fig. 8 with shower tray in a vertical section view; Fig. 10 the drain fitting Fig. 8, without shower tray, in a vertical section view; Fig. 11 the drain fitting Fig. 8, without shower tray, in top view; Fig. 12 the drain fitting from the Fig. 8 and Fig. 11 in a perspective exploded view; Fig. 13 a shower tray section with a drain fitting in a further embodiment, in a perspective bottom view; Fig. 14 the drain fitting Fig. 13, without shower tray, in a longitudinal 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 section view; Fig. 17 the drain fitting Fig. 14, without shower tray, top view; and Fig. 18 the drain fitting from the Fig. 14 and Fig. 17 in a perspective exploded view.

[0032] The drawing shows a section of the base 1 of a shower tray D. The shower tray D is, for example, a steel enamel shower tray. The shower tray D has a drain opening 2, which is preferably circular. Unlike conventional steel enamel shower trays, where the edge of the shower tray base surrounding the drain opening has a conical embossing that projects downwards from the underside of the base, the one shown in the drawing has a different embossing. Fig. 1 to 5 partially depicted shower tray in which the drain opening 2 is surrounded by a ring-shaped edge area 3, which extends away from the drain opening 2, has no embossing.

[0033] The upper surface of the shower tray disclosed herein is thus essentially flat in a perimeter area 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 upper surface or base 1 of the shower tray D is preferably slightly inclined towards the drain opening 2, so that water on the base 1 flows towards the drain opening 2. The angle of inclination of the upper surface of the shower tray relative to the horizontal is, for example, in the range of 1° to 5°, preferably in the range of 1° to 3°.

[0034] The drain opening 2 of the shower tray D is produced, for example, by laser cutting or punching. The drain opening 2 has relatively sharp edges and is bounded 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.

[0035] An annular flange 4 is arranged on the underside of the shower tray D, surrounding the drain opening 2. The flange 4 is associated with 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 designed for attachment to the underside of the shower tray.

[0036] The flange 4 is designed such 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 Fig. In the embodiment shown in Figures 1 to 4, the flange 4 is bonded to the shower tray. This bond can be achieved, for example, by applying adhesive around the circumference of the annular connection surface 4.1 or by using a double-sided adhesive ring.

[0037] The drain fitting 5 comprises a drain body 9 having an inlet opening 6 and a connection 7 for a drain pipe 8. The drain fitting 5 also comprises a cover 10. The cover 10 is detachably connected to the flange 4 and / or the drain body 9 and, when assembled, covers the inlet opening 6 of the drain body 9, limiting an inlet gap 11. The flange 4 has a horizontal outer dimension or an outer diameter A1, which is significantly larger than a horizontal outer dimension (e.g., outer diameter A2) of the cover 10 that is oriented in the same direction relative to the outer dimension of the flange. For example, the horizontal outer dimension or 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 that is oriented in the same direction relative to the outer dimension of the flange.

[0038] The flange 4 has an inlet surface 4.2 that is recessed relative to its connection surface 4.1. When the drain fitting 5 is installed, this inlet surface surrounds the inlet opening 6 of the drain housing 9 and is spaced apart from the underside of the cover 10. The connection surface 4.1 of the flange is integrally connected 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, which allow it to rest on the inlet surface 4.2.

[0039] Preferably, the cover 10 has an enamelled decorative panel 10.1 on its upper surface. The decorative panel 10.1 is attached, for example by gluing, to a carrier 10.2 which has spacers 12. The carrier 10.2 with the downwardly projecting spacers 12 can be made of plastic in a cost-effective manner.

[0040] The spacers 12 are dimensioned such that the top surface of the decorative panel 10.1 of the cover 10 and the top surface of the edge area 3 of the shower tray surrounding the drain opening 2 are flush with each other, preferably with the surface. The cover 10 or the decorative panel 10.1 is preferably slightly curved upwards.

[0041] The drain opening 2 of the shower tray and the cover 10 are relatively large. For example, the horizontal outer dimension or outer diameter of the decorative panel 10.1 of the cover 10 is at least 130 mm, preferably at least 150 mm, and particularly preferably at least 180 mm. The drain opening 2 and the cover 10 define a circumferential upper 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.

[0042] The drain housing 9 has a pot-shaped housing section 9.1, to which a substantially S-shaped or corrugated drain channel 9.2 is laterally attached. The drain channel 9.2 is shaped such that it has an overflow edge 9.3 that is significantly higher than a lower inlet edge 9.4, which is formed at the transition from the pot-shaped housing section 9.1 to the drain channel 9.2. The vertical distance between the lower inlet edge 9.4 and the overflow edge 9.3, which follows in the direction of flow, defines a water seal height and is, for example, approximately 50 mm. Water standing in the corrugated drain channel 9.2 acts as a water seal and serves as a trap. The drain channel 9.2 has a shallow channel cross-section between the lower inlet edge 9.4 and the overflow edge 9.3, the width B of which, or horizontal internal dimension, is a multiple of the channel height H measured orthogonally to it (cf. Fig. 1, Fig. 1a and Fig. 2) The width B of the drainage channel 9.2 essentially corresponds to that in Fig. 1 largest inner width (inner diameter) of the pot-shaped housing section 9.1 shown.

[0043] The connection 7 for a drain pipe 8, which follows the overflow edge 9.3 of the drain channel in the direction of flow, is preferably designed as a circular cylindrical connection spigot. A drain pipe 8, for example in the form of a pipe elbow, 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 a force-fit connection of the drain pipe 8.

[0044] The drain body 9 is preferably detachably mounted to the flange (adapter flange) 4. The detachable connection is, for example, designed as a screw connection. For this purpose, 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 that are arranged at equal intervals on a partial circle surrounding the through-opening 4.5 defined by the flange 4, through which water flowing from the shower tray base 1 enters the drain body 9. The fastening holes are formed in the flange 4 or in an additional fastening flange that can be inserted into the flange 4, which is connected or connectable to the shower tray. The diameter of these fastening holes is smaller than the diameter of the head of the fastening screws inserted therein.The spacers 12 of the cover include recesses 16 which serve to positively engage the heads of the fastening screws which protrude upwards relative to the inlet surface 4.2 of the flange.

[0045] The cup-shaped housing section 9.1 of the drain housing has an annular connection surface on its upper side, on which a sealing ring 17 made of elastomer rests. The flange 4 has a ribbed structure 4.6 on its underside facing the sealing ring 17. The ribbed structure 4.6 can, for example, comprise several annular ribs arranged coaxially and radially spaced from one another, which press into the elastic sealing ring 17 to create a seal after the flange 4 and drain housing 9 are connected.

[0046] A hair strainer 18 can be arranged below the removable cover 10. The hair strainer 18 is preferably removable and inserted into the inlet opening 6 of the drain housing 9. For this purpose, the hair strainer 18 is preferably provided with a cone-shaped, centrally located handle 19 (see figure). Fig. 1a).

[0047] The in Fig. The embodiment shown in section 5 differs from the one described in the Fig. In the embodiment shown in Figures 1 to 4, the flange 4 is modified by having several through holes 4.7 in the area of ​​its connection surface 4.1 for receiving fastening elements 20 connected to the underside of the shower tray base 1. These fastening elements 20 are, for example, screw bolts connected to the underside of the shower tray D, onto which fastening nuts are screwed. Thus, the flange 4 can alternatively or additionally be connected to the shower tray D by frictional connection.

[0048] According to another 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.

[0049] In the Fig. Figures 6 to 12 illustrate a further embodiment of the invention. In particular, in the Fig. 6 and Fig. Figure 7 shows a shower tray D that is particularly shallow, with the base 1 of the shower tray D having a slight slope 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, for example, circular.

[0050] Unlike conventional shower trays, where the edge of the shower tray base surrounding the drain opening has a conical embossing that projects downwards from the underside of the base, the one in Fig. 6, Fig. 7 and Fig. The shower tray D shown in Figure 9 has no downwardly projecting indentation in the edge area 3 immediately surrounding the drain opening 2, the radial edge width of which is, for example, at least 80 mm. Rather, the edge area 3 surrounding the drain opening 2 is essentially flat.

[0051] 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 for connection to the underside of the shower tray base 1 (see figure). Fig. 10, Fig. 11 and Fig. 12).

[0052] The flange 4 is designed such that it can be connected to the shower tray D in a liquid-tight manner without a connecting piece resting on the top of the shower tray base 1. In the embodiment according to the Fig. 6 to 12, the flange 4 is or will be bonded to the underside of the shower tray base 1. The bonded, 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.

[0053] The flange 4 is preferably designed as a cast part and made of plastic or metal. Reinforcing ribs 4.81, 4.82 are formed on the underside of the flange 4, comprising, for example, a central, annular reinforcing rib 4.81 and several radially extending reinforcing ribs 4.82.

[0054] Furthermore, several holes or receptacles 4.85 are provided on the underside of the flange 4 for attaching height-adjustable feet. These feet allow the base 1 of the shower tray D or bathtub to be supported on a bare or screed floor at the installation site.

[0055] The drain fitting 5 has a drain body 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 body 9 and, when installed, covers the inlet opening 6 of the drain body 9, limiting an inlet gap 11. The flange 4 has a horizontal outer dimension or an outer diameter A1 that is significantly larger than the outer diameter A2 of the cover 10, or a horizontal outer dimension of the cover 10 that is oriented in the same direction relative to the outer dimension of the flange. For example, the horizontal outer dimension or outer diameter A1 is 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 oriented in the same direction relative to the outer dimension of the flange 4.

[0056] The flange 4 defines an inlet surface 4.2 that is lower relative to the connection surface 4.1. When the drain fitting 5 is installed, this inlet surface surrounds the inlet opening 6 of the drain body 9 and is spaced apart from the underside of the cover 10. The cover 10 is provided with spacers 12 on its underside, which allow it to rest on the inlet surface 4.2.

[0057] A circumferential annular groove 4.30 for receiving a ring seal 26 is formed in the connection surface 4.1 of the flange 4. The annular groove 4.30 surrounds the 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 at a distance in the range of 2 mm to 15 mm.

[0058] The inlet surface 4.2, which is lower than the connection surface 4.1, is inclined, preferably conically, towards the inlet opening 6 of the drain housing. The inlet surface 4.2 is bounded on the outside by a circumferential step or a circumferential inner wall 4.9. The slope of the inlet surface 4.2 facilitates the flow of water into the drain housing 9.

[0059] Also in the one in the Fig. 6 and Fig. In the embodiment shown in Figure 9, the cover 10 has a decorative panel 10.1. The decorative panel 10.1, which is preferably enamelled, is in turn attached to a carrier 10.2 which has spacers 12 and which can be made cost-effectively from plastic.

[0060] 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- or web-shaped and project radially beyond the outer edge of the cover 10. At least some of the spacers 12 abut the circumferential shoulder or the circumferential wall 4.9 with their outer end faces 12.1. Furthermore, the spacers 12 are, for example, designed such that their ends, which project radially beyond the outer edge of the support 10.2 of the decorative panel 10.1 of the cover 10, are inclined towards the outer end face 12.1.

[0061] Especially based on the Fig. 9, Fig. 10 and Fig. Figure 12 shows that the circumferential shoulder or the circumferential inner wall 4.9 has a plurality of projections 4.10, wherein the spacers 12 engage in recesses 4.11 bounded by the projections 4.10. This positive-locking connection prevents or locks the cover 10 from rotating about a vertical axis relative to the flange 4.

[0062] The cover 10 or the support 10.2 of the cover has on its underside a tapered fluid guide element 10.3, which is designed, for example, in the form of a hyperbolic cone or hyperbolic truncated cone, wherein the tip or taper of the fluid guide element 10.3 projects into the inlet opening 6 of the drain housing 9.

[0063] To connect flange 4 and drain housing 9, flange 4 has a cylindrical receptacle 4.12 into which a cylindrical connecting piece 9.5 formed on the drain housing 9 is inserted. The receptacle 4.12 is defined by an inner cylindrical annular web 4.13 of flange 4. The connecting piece 9.5 has parallel circumferential ribs or annular grooves 9.6 on its outer surface, into which, for example, a sealing ring (O-ring) can be inserted. At the upper end of the receptacle 4.12, a circumferential, radially inwardly projecting projection 4.14 is formed, which serves as an axial stop for the connecting piece 9.5 (see figure). Fig. 9 and Fig. 12).

[0064] Furthermore, a screw flange 21 is provided for connecting flange 4 and drain housing 9, by means of which the inlet surface 4.2 of flange 4 is connected to the drain housing 9. For this purpose, the connection spigot 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 positive-locking reception of the flange section 21.1 of the screw flange 21.

[0065] The screw flange 21 is provided with grip elements 21.2. The grip elements 21.2 enable the screw flange 21 to be screwed into the internal thread 9.7 formed at the inlet opening 6 of the drain housing 9 without tools. The grip elements 21.2 are, for example, in the form of ribs and are arranged on the inside of the screw flange 21. Preferably, the ribs 21.2 project radially from the inside of the screw flange 21 and have end faces that extend downwards in an arc from the upper end of the respective rib 21.2 in the direction of the central axis of the screw flange 21.

[0066] 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 the one in the Fig. The dimensions shown in the exemplary embodiments 1 to 5 are given, so that reference is made to the preceding description to avoid repetition.

[0067] 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 bonded or welded together (see Fig. 12).

[0068] The in the Fig. The embodiment shown in sections 13 to 18 differs from the one shown in the Fig. The embodiment shown in Figures 6 to 12 is connected to the flange 4 and the drain housing 9. Similar to the embodiment shown in the Fig. The embodiments shown in 1 to 5 are also present in the embodiment described in the Fig. In the embodiment shown in Figures 7 to 18, threaded sleeves 15 are integrated into 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 mounting flange 24, which has mounting holes for inserting the fastening screws 23. The mounting holes are provided, for example, in radially inwardly projecting lugs 24.2 of the mounting flange 24, which is preferably made of stainless steel. The fastening screws 23 are countersunk screws. Accordingly, the mounting holes of the mounting flange 24 are essentially conical.

[0069] The cup-shaped housing section 9.1 of the drain housing has an annular connection surface 9.5' on its upper side, on which a sealing ring 17 made of elastomer rests. The flange 4 has a contact surface 4.6' on its underside facing the sealing ring 17. The contact surface 4.6' can be essentially smooth or in the form of a ribbed structure, for example a ribbed structure 4.6 according to Fig. 1a, be trained.

[0070] The inlet surface 4.2 of the flange 4 is similar to the embodiment shown in the Fig. 9 and Fig. 12 a ring-shaped shoulder 4.21 is formed for the positive locking reception of a flange section 24.1 of the mounting flange 24.

[0071] The cover 10 is provided on its underside with spacers 12, which allow it to rest on the inlet surface 4.2 of the flange. The spacers 12 are rib- or web-shaped and project beyond the outer edge of the cover 10. At least some of the spacers 12 abut the circumferential shoulder or the circumferential wall 4.9 of the flange with their outer end faces 12.1. The spacers 12 are designed, for example, such that their ends, which project radially beyond the outer edge of the support 10.2 of the decorative plate 10.1 of the cover, have a stepped reduction in height towards the outer end face 12.1. In contrast to the one described in the Fig. The spacers shown in examples 6 to 12 are 12 according to Fig. 18 wider and define a comparatively coarse star-shaped spoke structure with larger gaps between the spokes or spacers 12.

[0072] The Fig. 15, Fig. 16 and Fig. Figure 18 shows 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 bounded by the projections 4.10. This positive locking prevents or locks the cover 10 from rotating about a vertical axis relative to the flange 4.

[0073] 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 those in the Fig. The embodiment shown in 13 to 18 also has the dimensions already specified above with reference to the other embodiments, so that, to avoid repetition, particular reference is made to the description of the Fig. 1 to 5 are referred to.

[0074] The same applies to the S-shaped or wave-shaped design of the drain channel 9.2 of the drain housing 9, as well as to the construction of the drain housing 9 from a housing lower part 9' and a housing upper part 9", which are or will be bonded or welded together.

[0075] The embodiment of the invention is not limited to the exemplary embodiments shown in the drawing. Rather, numerous variants are possible, which, even in embodiments differing from those shown, make use of the invention specified in the appended claims. 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

[1] Drain fitting for a sanitary bathtub 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 area (3) of a drain opening (2) of the bathtub or shower tray, and with a cover (10) which is detachably connected to the flange (4) and / or the drain housing (9) and, when installed, 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 with the outer dimension (A1) of the flange (4), wherein the flange (4) is designed such that it can be connected to the underside of the tub or shower tray in a liquid-tight manner without a connecting counterpart abutting the top of the tub or shower tray base (1), wherein the flange (4) has an inlet surface (4.2) that is lower relative to the connection surface (4.1) of the flange (4), which in the installed state of the drain fitting (5) surrounds the inlet opening (6) of the drain housing (9) and is spaced apart from the underside of the cover (10), wherein an annular shoulder (4.21) is formed on the inlet surface (4.2) for the positive locking reception of a flange section (21.1) of a screw flange (21), and wherein the inlet surface (4.2) is connected to the drain housing (9) by means of the screw flange (21). [2] Drain fitting according to claim 1, characterized by , 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 with the outer dimension (A1) of the flange (4). [3] Drain fitting according to claim 1 or 2, characterized by , that a circumferential annular groove (4.30) for receiving a ring seal (26) is formed in the connection surface (4.1) of the flange (4). [4] Drain fitting according to one of claims 1 to 3, characterized by , that the cover (10) has spacers (12) on its underside with which it rests on the inlet surface (4.2). [5] Drain fitting according to claim 4, characterized by, that the flange (4) has a plurality of projections (4.10), wherein the spacers (12) engage in recesses (4.11) bounded by the projections (4.10). [6] Drain fitting according to claim 4, characterized by , that the inlet surface (4.2) is bounded to the outside by a circumferential shoulder or a circumferential inner wall (4.9), wherein the shoulder or wall (4.9) has a plurality of projections (4.10), and wherein the spacers (12) engage in recesses (4.11) bounded by the projections (4.10). [7] Drain fitting according to any one of claims 1 to 6, characterized by , that the connection surface (4.1) of the flange (4) is integrally connected via a conical inlet surface (4.3) to the inlet surface (4.2) surrounding the inlet opening (6) of the drain housing (9). [8] Drain fitting according to any one of claims 1 to 7, characterized by, that the inlet surface (4.2) is inclined towards the inlet opening (6) of the drain housing (9), preferably conical. [9] Drain fitting according to any one of claims 1 to 8, characterized by , that the screw flange (21) has handle elements (21.2). [10] Drain fitting according to any one of claims 1 to 9, characterized by , that the flange (4) has several through holes (4.7) in the area 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. [11] Drain fitting according to any one of claims 1 to 10, characterized by , 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. [12] Drain fitting according to any one of claims 1 to 11, characterized by , that the cover (10) has an enamelled decorative plate (10.1) on its upper side. [13] Drain fitting according to any one of claims 1 to 12, characterized by , that on the underside of the flange (4) one or more receptacles (4.85) are formed for attaching one or more leveling feet.

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