Door leaf with continuous handle strip and door equipped with it

Abstract

Door leaf (14) for an interior door, comprising a first panel (18) based on wood-based material and a second panel (20) based on wood-based material, wherein the panels (18, 20) form different areas of the door leaf (14), wherein the panels (18, 20) have a substantially V-shaped profile (24) on their mutually facing narrow end faces (22), a groove (26) being provided at the base of which, facing inwards into the panel (18, 20), the first and the second panel (18, 20) being connected by a connecting strip (28) which is inserted into the groove (26) of the first panel (18) and into the groove of the second panel (20), so that a handle recess extending over the door leaf (14) is provided on each broad side (30a, 30b) of the door leaf (14). (32) is formed, wherein grip areas (36) are formed on the V-flanks (34a-34d) and the connecting strip (28) forms a visible contrast strip area of ​​the broad side (30a, 30b) of the door leaf (14),wherein each V-flank (34a-34d) is covered by a handle profile (40) mounted on the respective panel (18, 20), so that the handle areas (36) are formed on the handle profiles (40).

Description

The invention relates to a door leaf for an interior door, in particular based on wood-based materials. The invention also relates to a door provided with such a door leaf and a frame, also preferably based on wood-based materials. For technological background and definitions, reference is made to the following sources, upon whose knowledge the following disclosure is based:[1] BASIC KNOWLEDGE DOORS - Hörmann Technical Handbook, Edition 1 / 2019, Publisher: Hörmann KG Sales Company, available since January 2019 at https: / / cdn.hoermann-cloud.de / fileadmin / _country / kataloge / pdf / HOERHANDBUCH-Bd-01-Grundwissen_2019_.pdf[2] HUGA - The Program, company brochure of HUGA KG, downloaded on November 14, 2023 at https: / / www.huga.de / fileadmin / huga / Media / Medien / Downloads / PDF_Fach haendler / Gesamtprogramm / AD_DasProgramm_06-2023_WEB.pdf[3] DE 40 2017 000 136-0001[4] Interior Doors, company brochure of Hörmann KG Sales company, downloaded on 14.02.2025 from https: / / www.hoermann.de / mediacenter / download / 286536de / Zimmertueren_86734_DE.pdf?20240806121643[5] Wooden commercial doors, company brochure of Hörmann KG Sales Company, downloaded on 14.02.2025 from https: / / www.hoermann.de / mediacenter / download / 287875de / Holz_Objekttu eren_DE.pdf?20240910114822[6] Interior Door Technology, company brochure of Hörmann KG Sales Company, downloaded on 14.02.2025 from https: / / www.hoermann.de / mediacenter / download / 310819de / Zimmertueren_Technik.pdf?20241105112648. Interior doors made of wood-based materials, as well as their door leaves, are known from references [2] and [4] to [6]. The interior door described in [3] features a recessed handle extending vertically across the door leaf, created by connecting two spaced-apart panels of the door leaf with a connecting strip. This connecting strip serves as a visual element, lending the door a distinctive appearance. The facing edges of the panels act as handles. The invention aims to create a door leaf for an interior door with a continuous handle strip that gives a special look, is particularly cost-effective to manufacture in large industrial series and offers special grip comfort. To solve this problem, the invention provides a door leaf according to claim 1. A door provided therewith and the use of handle profile strips are the subject of the dependent claim. Advantageous embodiments are the subject of the dependent claims. The invention provides a door leaf for an interior door, comprising a first panel based on wood-based material and a second panel based on wood-based material, wherein the panels form different areas of the door leaf, wherein the panels have a V-shaped profile on their narrow end faces facing each other, a groove is provided at the base of which, facing inwards into the panel, the first and second panels are connected by a connecting strip which is inserted into the groove of the first panel and into the groove of the second panel, so that a recessed handle extending transversely across the door leaf is formed on each broad side of the door leaf, wherein handle areas are formed on the V-flanks and the connecting strip forms a visible contrast strip area on the broad side of the door leaf, wherein each V-flank is covered by a handle strip profile mounted on the respective panel.so that the gripping areas are formed on the grip strip profiles. In some embodiments, it is provided that at least one, several or all of the handle strip profiles are selected from the group consisting of a plastic strip, a rubber strip, a metal strip, a stainless steel strip, an aluminum strip, and a profile strip that is designed to contrast in color with the panel and / or the connecting strip. In some embodiments, the handle profile has a strip area extending over the side of the V-flank facing the other panel and an edge area formed at the transition from the V-flank to the broad side of the panel, forming an edge projecting from the strip area to protect against the user's fingers slipping out of the handle recess. In some embodiments, the outer circumference of the edge area is essentially rectangular. In some embodiments, a mounting groove is formed inside the edge area, with which the handle profile sits on a corner edge formed between the V-flank and the broad side of the panel. In some embodiments, the handle profile is glued onto the panel. In some embodiments, it is provided that an identically constructed handle profile is applied to each of the first to fourth V-flanks. In some embodiments, the groove at the base of the V-shape of the panels has a uniform width. Such designs are particularly suitable for inserting connecting strips made of wood-based materials or plastic. In some embodiments, the groove at the base of the V-shape of the panels has a wider opening for inserting sealing strips or glazing beads and a narrower base area for holding the connecting strip. Such designs are particularly suitable for connecting strips made of glass or the like, for example, opaque or transparent. In some embodiments, the groove at the base of the V-shape of the panels is designed to be shallower at the ends of the handle recess than in the middle section. This results in only a minimal penetration of the connecting strip into the panel on the narrow ends visible when the door is open, creating a high-quality appearance. In the middle section, the connecting strip can engage more deeply into the panel, resulting in a stronger and more stable connection. In some embodiments, the connecting strip is made of wood-based material. In some embodiments, the connecting strip is provided with a surface veneer to form the visible surfaces or In some embodiments, the connecting strip is made of glass. In some embodiments, the connecting strip is provided to have concavely rounded corner areas and / or the panels are each glued to the connecting strip. In some embodiments, the connecting strip is designed to extend horizontally across the door leaf during intended use. In particular, the door leaf is designed with a flush profile, which allows for a particularly high-quality appearance of a flush-closing door. According to another aspect, the invention provides a door comprising a frame and a door leaf pivotably attached to the frame by means of door hinges about a lateral vertical axis according to one of the preceding embodiments, wherein magnets are provided on the frame and / or the door leaf in such a way that the door leaf is held in its closed position by magnetic force. In some embodiments, it is provided that both the first and the second panel are pivotally hinged to the frame by means of at least one hinge. In some embodiments, at least one of the panels is hinged to the frame by several vertically spaced hinges, and the other panel is hinged to the frame by only one hinge. In some embodiments, the frame is provided to have a frame rebate in which the door leaf is flush when closed. According to another aspect, the door enables the use of handle profiles in the manufacture of a door leaf, in particular a door leaf according to one of the preceding embodiments, wherein a first panel and a second panel are provided, which have a V-shaped profile on their narrow end faces facing each other, a groove being provided at the base of which is directed inwards into the panel, wherein the V-profiles are machined into the panels by computer control, wherein after manufacture handle profiles are applied to each of the V-flanks to cover them and provide a handle strip with a grip edge, wherein the panels are connected to each other at a distance by means of a connecting strip inserted into the respective groove, so that a grip recess is created in the area of ​​the connecting strip on each broad side of the door leaf. The door leaf can thus be manufactured in large series from simple wood-based panels, including wood-based materials that only have a visually high-quality surface on the outside, e.g. veneer or coating, by machining. The V-shaped edges, where the handles are formed, can thus remain untreated. No measures need to be taken during the manufacturing of the narrow end faces of the panels to ensure a comfortable grip or a high-quality appearance. Previously, this was only possible through very complex manual processing in specialized carpentry workshops. Instead, a handle profile suitable for large-scale industrial production is now available. This profile can be supplied as a strip or rolled up and can be cut to the appropriate dimensions of the door leaf (depending on the orientation of the recessed handle, either the height or width of the door leaf) by machine or manually, and easily applied to each of the four V-edges. The handle profile covers the V-edge, allowing it to remain completely untreated; even a lower-quality interior material can remain, concealed by the handle profile. The handle profile can be optimized for comfortable gripping and adds visual appeal. A grip edge may be provided to prevent fingers from slipping off the V-flank, so that the door leaf can be gripped comfortably and securely and opened, for example, against magnetic resistance. A high-quality look can be achieved, for example through color accents or contrasts in the handle strip. The material can also be made non-slip and / or rubbery / elastic. An exemplary embodiment is explained in more detail below with reference to the accompanying drawings. These show: Fig. 1 a front view of a door according to an exemplary embodiment of the invention with a door leaf according to an embodiment of the invention; Fig. 2 a front view of the door leaf of the door of Fig. 1; Fig. 3 a side view of a central area of ​​a narrow end face of the door leaf as seen from the right in Fig. 2; Fig. 4 a side view of a handle profile used four times in the area of ​​a recessed handle on the door leaf; Fig. 5 a front view of a connecting strip that is used instead of a connecting strip shown in Fig. 3 in a further embodiment of the door leaf; Fig. 6 a partially cut-away front view of the door, indicating the fastening of the connecting strip and the position of door fittings; and Fig. 7 a view as in Fig.3 of a door leaf according to a comparative example not covered by the invention. Fig. 1 shows a front view of a door 10 with a frame 12 and a door leaf 14. The door 10 is a hinged interior door, with the door leaf 14 and the frame 12 constructed from wood-based materials, as described in references [2] and [4] to [6]. For further details on possible materials and surface finishes of the door leaf panels and frame, please refer to these references. The door leaf 14 is flush, i.e., without a rebate. The frame 12 has a rebate 16 in which the door leaf 14 fits flush when the door 10 is closed. The door leaf 14 is shown in front view in Fig. 2, and a central area of ​​the door leaf 14, seen from the right in Fig. 2, is shown in Fig. 3. The door leaf 14 comprises a first panel 18 made of wood-based material and a second panel 20 made of wood-based material, such that the panels 18 and 20 are spaced apart vertically and form different sections of the door leaf 14. The first and second panels 18 and 20 each have a V-shaped profile 24 on their narrow end face 22, which faces the other panel 20 and 18. At the apex of the V-shape, which faces inwards into the panel 18 and 20, and thus at the narrower base of the V-shaped profile 24, a groove 26 is provided on each panel 18 and 20. The first and second panels 18, 20 are connected by a connecting strip 28, which is inserted into the groove 26 of the first panel 18 and into the groove 26 of the second panel 20. This creates a handle recess 32 extending transversely across each broad side 30a, 30b of the door leaf 14. In the preferred embodiment shown, the connecting strip 28 extends horizontally during normal use of the door leaf 14, so that the handle recess 32, which extends along the connecting strip 28 and is bounded inwards by it, also extends horizontally. In other embodiments, not shown here, the connecting strip 28 and the handle recess 32 can also extend vertically. Each of the recessed handles 32 formed on the front broad side 30a and the rear broad side 30b is bounded inwards in the thickness direction of the door leaf 14 by the connecting strip 28. In the illustrated horizontal extension of the recessed handle 32, it is bounded upwards and downwards by the respective V-flank 34a-34d (sloping area of ​​the upper and lower V-shape). Fig. 7 shows a comparative example of a door based on a previous technology, made of wood-based materials, with such a recessed handle 32. A grip area 36 is formed on the V-shaped flank 34a-34d of the panels 18, 20. Accordingly, the V-shaped flank 34a-34d has the same surface coating as the broad side of the panels 18, 20. Furthermore, a grip edge 38 is formed at the transition between the V-shaped flank 34a-34d and the broad side 30a, 30b of the panel 18, 20, which makes the grip area 36 easier to grasp. This prevents fingers from slipping. Since the door leaf 14 is advantageously designed without a handle for aesthetic reasons, it is held in place by suitable means to generate a holding force, such as a jamming mechanism or magnets. In order to overcome the holding force, the grip area 36 should be able to be held comfortably and securely. To create such a handle area 36, ​​the comparative example currently requires complex manual manufacturing in specialized carpentry workshops. This makes the visually very high-quality door 10 exorbitantly expensive, so that it has not found widespread use on the market, but is only available as a luxury special feature. In embodiments according to the invention, an example of which is shown in Fig. 3, the grip areas 36 are also formed on the V-flanks 34a-34d, wherein here too the connecting strip 28 forms a visible contrast strip area of ​​the broad side 30a, 30b of the door leaf 10, so that the door leaf 10 looks very high-quality and clean. To form the grip area 36, ​​each V-flank 34a-34d is covered by a grip strip profile 40 attached to the respective panel 18, 20. Thus, the grip areas 36 are formed on the grip strip profiles 40. This has several advantages. The panels 18, 20 can be made from cost-effective wood materials, with only the broad sides 30a, 30b having higher-quality coatings, such as veneers or plastic surface coatings, as shown in references [2] and [4] to [6]. For example, the panels 18, 20 are parts from the large-scale industrial production of the doors according to [2] and [4] to [6], wherein a panel that is otherwise used in one piece to form a known door leaf is divided in a method for manufacturing the door leaf according to embodiments of the invention in order to form the panels 18, 20. The V-shaped profile with the groove is then machined into the respective cut side by computer-controlled machining in industrial series production. The panels 18, 20 thus formed can be used without any further complex surface treatments; only the handle profiles 40 are applied to the V-shaped edges and, for example, glued in place. The handle profiles 40 of all V-shaped edges 34a-34d can be identical and cut to length from a long raw profile. Cut edges are covered by the handle profiles 40, thus preventing the risk of splintering when gripping the handle area 36, ​​even on the untreated end faces of the panels. Fig. 4 shows such a handle profile 40 from the side. The handle profile 40 can be selected from various materials. For example, it can be made of a plastic strip, a rubber strip, or a metal strip. High-quality appearances can be achieved. For example, the handle profile can also be made of a stainless steel strip or an aluminum strip. A profile strip can be obtained that contrasts in color with the panel 18, 20 and / or with the connecting strip 28. This allows for the creation of additional visual accents. In some embodiments, the handle profile 40 is color-matched to the surface of the broad sides 30a, 30b of the panels 18, 20. This is also easily achievable, for example, with plastic strips that can be manufactured with the same appearance as plastic coatings. For instance, a range of strips is kept on hand from which the handle profile 40 is selected depending on the appearance of the panels 18, 20. In some embodiments, the handle profile 40 has a strip section 42 extending across the side of the V-flank 34a-34d facing the other panel and an edge section 44 formed at the transition from the V-flank 34a-34d to the broad side 30a, 30b of the panel 18, 20. The edge section 44 forms an edge projecting from the strip section 42 to prevent a user's fingers from slipping out of the handle recess, so that the handle edge 38 does not need to be formed on the panel itself, but is provided by the handle profile 40. This also greatly simplifies the manufacture of the door and reduces costs. Correspondingly different shapes of the handle edge can be easily produced by providing an assortment of strips. Strip area 42 and / or edge area 44 can be selected according to the desired feel. For example, the surface of strip area 42 is made of non-slip material. Some versions also feature a foamed plastic surface that is particularly comfortable to grip. In some embodiments, a mounting groove 46 is formed inside the edge area 44, with which the handle strip profile 40 sits on a corner edge 49 formed between the V-flank 34a-34d and the broad side 30a, 30b of the panel 18, 20. This covers the sharp corner edge 49. Only the broad side 30a, 30b of the panel 18, 20 with the desired surface appearance is visible. Furthermore, the fit of the handle profile on the panel can be improved with the mounting groove, as a form-fit connection is added to the fabric or friction fit. In some versions, the connecting strip 28 is made of wood-based material and finished with a contrasting surface veneer to form the visible surfaces. Other suitable materials, such as plastic, are also possible for the connecting strip 28, depending on the desired appearance. Figure 5 shows a version of the connecting strip 28 made of glass. The connecting strip 28 advantageously has concavely rounded or chamfered corner regions 48. The base of the groove 26 is advantageously designed to be complementary to the top and bottom surfaces of the connecting strip 28, as indicated in Fig. 6, so that the connecting strip 28 can be secured in the groove 26 against lateral displacement by means of a positive fit. In particular, the groove is less deep in side regions 50 at the narrow end faces than in a central region 52. As shown in Fig. 3, the groove 26 has a wider opening area 53, so that sealing profiles and / or retaining profiles 62 can be inserted on both sides between the groove flanks and the connecting strip 28. For example, silicone sealing or retaining profiles 54 are used. At the groove base 51, the groove 26 is narrower to tightly enclose the top and bottom of the connecting strip 28, for example by clamping. As indicated in Fig. 6, the connecting strip 28 is bonded to the respective panel 18, 20 in the side areas 50 and in a smaller central area with a suitable adhesive 56, such as Construct PUR-Express, while in between a more flexible connection with a more elastic adhesive connector 58 or the like, such as Sikiaflex-252, is provided. Figure 6 also shows the position of the door hardware. On the hinge side, the upper first panel 18 is hinged to the frame 12 by a first and a second hinge 58a, 58b. The lower second panel 20 is hinged to the frame 12 by a third hinge 58c. The use of at least one additional hinge 58b compensates for the reduced stiffness of the door leaf 14, caused by the thinner central connecting strip, compared to a door leaf made from a single panel. Magnets 60 are provided on the narrow end face away from the hinge of the door leaf 14 and / or the frame 12, which cooperate with a corresponding counter bearing on the other of the door elements 12, 14 to keep the door in the closed position. A door leaf (14) for an interior door has been described, comprising a first panel (18) based on wood-based material and a second panel (20) based on wood-based material, wherein the panels (18, 20) form different areas of the door leaf (14), wherein the panels (18, 20) have a substantially V-shaped profile (24) on their mutually facing narrow end faces (22), a groove (26) is provided at the base of which, directed inwards into the panel (18, 20), the first and the second panel (18, 20) are connected by a connecting strip (28) which is inserted into the groove (26) of the first panel (18) and into the groove of the second panel (20), so that on each broad side (30a, 30b) of the door leaf (14) a groove extending over the door leaf (14) is provided. A grip recess (32) is formed, wherein grip areas (36) are formed on the V-flanks (34a-34d) and the connecting strip (28) has a visible contrast strip area on the broad side (30a,30b) of the door leaf (14), wherein each V-flank (34a-34d) is covered by a handle profile (40) mounted on the respective panel (18, 20), so that the handle areas (36) are formed on the handle profiles (40). Furthermore, a door (10) equipped in this way and the use of a handle profile (40) for manufacturing the door leaf (14) have been described. Reference symbol list: 10 Door 12 Frame 14 Door leaf 16 Rebate 18 First panel, e.g., upper panel 20 Second panel, e.g., lower panel 22 Narrow end face 24 V-shaped profile (V-shape) 26 Groove 28 Connecting strip 30a First broad side (facing the opening direction of the door, front broad side) 30b First broad side (facing the closing direction of the door, rear broad side) 32 Recessed handle 34a First V-flank 34b Second V-flank 34c Third V-flank 34d Fourth V-flank 36 Grip area (area gripped by the fingers) 38 Handle edge 40 Handle strip profile 42 Strip area 44 Edge area 46 Surface groove 49 Corner edge 48 Corner area 50 Side area (of the groove) 51 Base area (of the groove) 52 Middle area (of the groove) 53 Groove opening area 54 Adhesive 56 Elastomer / flexible adhesive connector 58a First hinge 58b Second hinge 58c Third hinge 60 Magnet 62 Retaining profile QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited non-patent literature https: / / cdn.hoermann-cloud.de / fileadmin / _country / kataloge / pdf / HOERHANDBUCH-Bd-01-Grundwissen_2019_.pdf

[0002] https: / / www.huga.de / fileadmin / huga / Media / Medien / Downloads / PDF_Fach haendler / Gesamtprogramm / AD_DasProgramm_06-2023_WEB.pdf

[0002] https: / / www.hoermann.de / mediacenter / download / 286536de / Zimmertueren_86734_DE.pdf?20240806121643

[0002] https: / / www.hoermann.de / mediacenter / download / 287875de / Holz_Objekttueren_DE.pdf?20240910114822

[0002] https: / / www.hoermann.de / mediacenter / download / 310819de / Zimmertueren_Technik.pdf?20241105112648

[0002]

Claims

Door leaf (14) for an interior door, comprising a first panel (18) based on wood-based material and a second panel (20) based on wood-based material, wherein the panels (18, 20) form different areas of the door leaf (14), wherein the panels (18, 20) have a substantially V-shaped profile (24) on their mutually facing narrow end faces (22), a groove (26) being provided at the base of which, facing inwards into the panel (18, 20), the first and the second panel (18, 20) being connected by a connecting strip (28) which is inserted into the groove (26) of the first panel (18) and into the groove of the second panel (20), so that a handle recess extending over the door leaf (14) is provided on each broad side (30a, 30b) of the door leaf (14). (32) is formed, wherein grip areas (36) are formed on the V-flanks (34a-34d) and the connecting strip (28) forms a visible contrast strip area of ​​the broad side (30a, 30b) of the door leaf (14),wherein each V-flank (34a-34d) is covered by a handle profile (40) mounted on the respective panel (18, 20), so that the handle areas (36) are formed on the handle profiles (40). Door leaf (14) according to claim 1, characterized in that at least one, several or all of the handle strip profiles (40) are selected from the group comprising a plastic strip, a rubber strip, a metal strip, a stainless steel strip, an aluminum strip, and a profile strip which is designed to be colour-contrasting with respect to the panel and / or the connecting strip. Door leaf (14) according to one of the preceding claims, characterized in that the handle strip profile (40) has a strip area (42) extending over the side of the V-flank (34a-34d) facing the other panel (20, 18) and an edge area (44) which is formed at the transition from the V-flank (34a-34d) to the broad side (30a, 30b) of the panel (18, 20) and forms an edge (38) projecting from the strip area (42) to protect against the fingers of a user slipping out of the handle recess (32). Door leaf (14) according to claim 3, characterized in that the outer circumference of the edge area (44) is essentially rectangular on the outside and / or that a mounting groove (46) is formed inside the edge area (44) with which the handle strip profile (40) sits on a corner edge (49) formed between the V-flank (34a-34d) and the broad side (30a-30d) of the panel (18, 20). Door leaf (14) according to one of the preceding claims, characterized in that the handle strip profiles (40) are each glued onto the associated panel (18, 20) and / or that an identically constructed handle strip profile (40) is applied to each of the first to fourth V-flank (34a-34d). Door leaf (14) according to one of the preceding claims, characterized in that the groove (26) at the base of the V-shape of the panels (18, 20)6.1 has the same width everywhere or6.2 has a wider opening (53) for inserting sealing strips or glazing beads and a narrower base area (51) for holding the connecting strip and / or6.3 has a lesser depth at the lateral end areas (50) of the handle recess (32) than at a central area (52). Door leaf (14) according to one of the preceding claims, characterized in that the connecting strip (28)7.1 is made of wood-based material or7.2 is formed with a surface veneer to form the visible surfaces or7.3 is made of glass. Door leaf (14) according to one of the preceding claims, characterized in that the connecting strip (28) has concave rounded or chamfered corner areas (48) and / or that the panels (18, 20) are each bonded to the connecting strip (28). Door leaf (14) according to one of the preceding claims, characterized in that the connecting strip (28) extends in a horizontal direction across the door leaf (14) during intended use. Door leaf (14) according to one of the preceding claims, designed as a flush door leaf. Door (10) comprising a frame (12) and a door leaf (14) pivotally mounted on the frame (12) by means of door hinges (58a-58c) about a lateral vertical axis according to one of the preceding claims, wherein magnets (60) are provided on the frame (12) and / or the door leaf (14) such that the door leaf (14) is held in its closed position by magnetic force. Door (10) according to claim 11, with a door leaf (14) according to claim 9, characterized in that both the first and the second panel (18, 20) are pivotally hinged to the frame (12) by means of at least one hinge (58a-58c), or that at least one of the panels (18) is hinged to the frame (12) by means of several hinges (58a, 58b) spaced apart in the vertical direction and the other panel is hinged to the frame (12) by means of at least one hinge (58c), preferably exactly one hinge (58c). Door (10) according to one of claims 11 or 12, characterized in that the frame (12) has a frame rebate (16) in which the door leaf (14) is flush received in the closed state. Use of handle profiles (40) in the manufacture of a door leaf (14) according to any one of claims 1 to 10, wherein a first panel (18) and a second panel (20) are provided, in which V-shaped profiles (24) with a groove (26) at the base of the V-profile (24) are machined into the panels (18, 20) on their narrow end faces (22) facing each other, wherein, after the manufacture of the respective V-profile (24), handle profiles (40) are applied to each of the V-flanks (34a-34d) to cover them and provide a handle area (36) with a handle edge (38), wherein the panels (18) are connected to each other at a distance by means of a connecting strip (28) inserted into the respective groove (26), so that in the area of ​​the connecting strip (28) on each broad side (30a, 30b) of the door leaf (14) a handle recess (32) is created.

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