Guide rail of a guide system, guide system and furniture

Abstract

Guide rail (17) of a guide system for a sliding element, in particular for a sliding element (3) of a piece of furniture (1) or a household appliance, such as a kitchen appliance, wherein the guide rail (17) comprises a rail body (31) and a fastening element (33, 34), wherein the fastening element (33, 34) is configured to fasten the guide rail (17) to a counterpart section in the operating state of the guide system, wherein the fastening element (33, 34) is connected to the rail body (31), and wherein the fastening element (33, 34) has a flat material section with opposing main sides and a narrow end-face edge section (46) between the main sides, wherein, in the connected state of the fastening element (33, 34) with the rail body (31), the edge section (46) of the fastening element (33, 34)34) is butt-jointed with a surface side (41) of the guide rail (17) which is oriented upright in the operating state, wherein the edge section (46) has straight sections offset from one another which are connected to each other via a step located between the straight sections, characterized in that the straight sections comprise two lower sections and one straight section offset upwards thereto, wherein the edge section (46) has a hat-shaped profile in front view of the edge section (46) with two lateral sub-areas and a raised central sub-area.

Description

State of the art Guide rails or guide systems for a drawer element, in particular a drawer element of a piece of furniture or a household appliance, such as a kitchen appliance, are known in different designs. For example, so-called partial extensions with two guide rails or full extensions with three guide rails are used as guide systems in an extension unit, whereby the rails can be moved telescopically relative to each other. Typically, a drawer element, such as a drawer, shelf, cooking tray, or the like, is slidably mounted on exactly two separate, identical partial-extension or full-extension runners. The respective runner runner unit is preferably attached to the inside of a furniture carcass or the housing of a household or kitchen appliance. Since a guidance system or guide rail must meet high technical and economic requirements, further optimizations in this regard are necessary. The AT 518 077 B1 standard is cited as the state of the art. Purpose and advantages of the invention The object of the present invention is to further improve the aforementioned guide rails or guide systems formed therewith, their provision, and corresponding furniture and household appliances, such as kitchen appliances, particularly with regard to technical and economic aspects, as well as material-saving and automated manufacturing. The guide or guide rail should be compact and possess a comparatively high mechanical load-bearing capacity. This problem is solved by the independent claims. The dependent claims address advantageous further developments of the invention. The invention relates to a guide rail of a guide system for a sliding element, e.g., a drawer, in particular for a sliding element of a piece of furniture or a household appliance, such as a kitchen appliance, wherein the guide rail comprises a rail body and a fastening element, wherein the fastening element is designed to fasten the guide rail to a counterpart in the operating state of the guide system, wherein the fastening element is connected to the rail body, and wherein the fastening element has a flat material section with opposing main sides and a narrow end-face edge section between the main sides. Accordingly, the guide rail is a fixed rail or cabinet rail that is fixed in position to the counterpart, such as a cabinet, by means of the fastening element in the operating state. In particular, the invention relates to a furniture element guide rail or a guide rail of a furniture element guide system or a guide rail of a furniture partial extension or a furniture full extension. In the manufacture of the guide rail, the rail body and the fastening element are each provided as separate, pre-produced components, which are then firmly joined together to complete the guide rail. Preferably, the fastening element is manufactured from an initially flat, flat or strip material, such as sheet metal or steel sheet, through a forming process, such as bending. The rail body can be manufactured from sheet metal or, for example, be a rolled, drawn, or pressed metal profile. Preferably, the fastening element, which is also referred to as an adapter bracket or mounting bracket, is formed from a flat sheet material that is at least approximately rectangular in its initial form, using processes such as punching and cold forming to achieve its final angular shape. In its basic form, the fastening element is preferably L-shaped.It has two legs that are angular, in particular right-angled, to each other. The rail body is the part of the guide rail which interacts with another guide rail such as a center rail or a push element rail, or with bearing means of the guide system acting between the rails. The core of the invention lies in the fact that, when the fastening element is connected to the rail body, the edge section of the fastening element is butt-jointed to the rail body with a surface that is oriented upright in the operating state of the guide rail. The fastening element is preferably bonded to the rail body by a material-fit connection. The fastening element preferably comprises two legs that are connected to each other along a bending line and are oriented at an angle to each other. The fastening element is preferably formed in one piece from a sheet metal material. The guide rail or rail body preferably has a surface that is oriented upright or vertically in the operating state and faces the opposite section, such as the inside of a cabinet side wall. This surface is particularly a longitudinal surface or a surface extending over the entire or substantial length of the rail body, preferably in a strip shape, such as a side wall of the guide rail or rail body. The upright surface on the rail body or the rail body side wall is preferably an outer surface of, for example, an L-shaped or U-shaped rail body in cross-section, or a wall of a four- or polygonal rail body in cross-section. It is advantageous that the fastening element is designed symmetrically. Preferably, the fastening element is mirror-symmetrical. The fastening element is advantageously symmetrical about a plane of symmetry that is perpendicular to the two legs of the fastening element and passes through the central axis of the fastening element. This central axis, when connected to the rail body, is oriented along the longitudinal axis of the rail body, thus defining the center of the fastening element in the longitudinal direction of the rail body or guide rail. This direction coincides with the direction of the bending line, along which the two legs of the fastening element are perpendicular to each other. The advantage here is that the fastening element can be used identically as a front or rear fastening element on a guide rail, as well as for a right-hand guide system unit or a right-hand partial or full extension unit, or for a left-hand guide system unit or a left-hand partial or full extension unit. This is particularly advantageous economically with regard to the manufacture, supply, storage, and processing of the fastening element. Only one embodiment of the fastening element is required, which is universally applicable. It is advantageous that the connection between the fastening element and the rail body is achieved solely through a butt joint between the edge section of the fastening element and the flat surface of the rail body. This is advantageous from a manufacturing perspective. Another advantage is that the fastener is designed in its basic form as an angled element with two legs oriented at an angle to each other, one leg comprising the flat material section with the opposing main sides and the narrow edge section. This simplifies the manufacturing of the fastener from sheet metal. Up to now, connecting the fastener to the rail body requires a comparatively large surface area on both the rail body and the fastener. For the known connection of the fastener to the rail body, the relevant sheet metal sections, for example, are overlapped and joined together. The surface sections are in contact with each other, and the two opposing sheet metal sections are connected, for example, by fasteners such as rivets or by a clinching process. The invention proposes a completely different approach, whereby only comparatively much smaller areas of the sheet metal sections on the rail body and the fastening element are brought into contact with each other and welded, bonded, or soldered together, preferably by laser welding. The resulting weld seam can be formed on both sides along the upper boundary of the edge section and / or along the lower boundary of the edge section. For maximum connection stability, the weld seam at the top or bottom can preferably be continuous or be formed with an interruption along the length of the edge section's boundary. The interconnected surface sections according to the invention comprise only a fraction of the area that comes into contact or is connected in known connections between the guide rail and the fastening element. For example, in the guide rail according to the invention, the area required for the connection on a single fastening element is approximately 15 mm², and thus the area required for the connection on the rail body is also approximately 15 mm². Two identical fastening elements are provided on the guide rail. In contrast, in known comparable guide rails with two fastening elements on the guide rail, the area required for the connection is on one fastening element or the rail body, on the order of approximately 120 mm². This area is provided, for example, by the top surface of a horizontal leg of the fastening element. This means that the guide rail according to the invention requires a connection surface that is only approximately 12% of the connection surface of known guide rails. The saved area means, among other things, that the fastening element, or a horizontal leg of the fastening element, can be made smaller by this amount. Thus, the invention advantageously allows for material savings and a corresponding weight reduction with respect to the fastening element. Accordingly, the extension of the horizontal leg of the fastening element, from, for example, the right-angled bend to the free end where the edge section is located, is comparatively much shorter than is the case with known fastening elements or adapter brackets. Preferably, the fastening element has an approximately L-shaped cross-section with one leg oriented horizontally and one leg oriented vertically in the operating state. At least one leg has a raised section relative to the plane formed by the leg, which is created from the strip material by deformation. This raised section advantageously provides mechanical stiffening of the fastening element compared to a flat or planar form. The raised section is preferably formed substantially in the leg facing the rail body or horizontally oriented leg. The raised section preferably extends into the angled area and beyond it, somewhat into the area of ​​the other or vertical leg. The length of the rail-side leg, specifically its extension from the bend to the free end, determines the distance between the rail body and the opposing section, such as the inside of a furniture carcass side panel. The length of this leg dictates how the fastener can be connected to the rail body. The size or area of ​​the other leg, the one facing the carcass, determines the section or area of ​​the fastener used for attachment to the opposing section, such as the furniture carcass side panel. Preferably, the thickness of the edge section of the rail-side leg, i.e., the height of the end-face strip-shaped surface via which the butt joint with the upright surface of the rail body is realized, corresponds to the material thickness of the flat material of the fastening element. The flat material or the formed sheet metal preferably has a thickness between 0.4 and 1.5 millimeters. Preferably, the material thickness of the fastening element over its substantially entire design is 0.8 millimeters. For the butt joint, the edge section has an end face or surface that is flat or oriented perpendicular to the two opposing main or surface faces of the fastening angle. The surface of the edge section, which is created, for example, by stamping or laser cutting of the strip material, is accordingly flat or lies in a plane.This makes the edge section, or rather its flat end face, advantageously suited for a butt joint or abutting contact with the similarly flat surface of the rail body. The adjacent surfaces of the end face of the fastening element's edge section and the surface of the rail body are therefore in full contact, which is particularly advantageous for a material-bonded connection. The vertically oriented leg of the fastening element advantageously has connecting means or connecting sections, e.g. through openings such as screw holes for screwing the fastening element with an attached guide rail to a counterpart section, such as a side wall of a furniture carcass. Another advantage lies in the strip-like design of the edge section of the fastening element, which is butt-jointed to the vertically oriented surface of the rail body. The strip-like shape of the interconnected sections allows for advantageous adjustment of the connection, depending on the edge section's orientation. In particular, the connection to the edge section can be established over a relatively small area on the surface. This also results in a multitude of different possibilities for attaching the edge section to the surface along its linear path. In other words, the fastening element can be selectively attached to the rail body or its surface at different heights or in different vertical positions. It is also advantageous that the shape of the edge section is determined by the shape of the flat material section of the fastener adjacent to the edge section. In particular, the shape of the edge section can be influenced by an indentation in the relevant horizontal leg of the fastener. The shape of the edge section refers to the line along its length, viewed from the front or perpendicular to the plane of the narrow end face of the edge section. In the case of a simple L-shaped fastener made from a flat sheet bent at a right angle, the shape of the edge section is a straight line. If, for example, an indentation such as a depression or raised area is present in the horizontal leg of the fastener, the shape of the edge section, due to the indentation, deviates from the straight line of the flat leg without an indentation, following a curve, for example, downwards or upwards. An advantageous modification of the invention is provided in that the flat material section adjacent to the edge section comprises a recessed and / or raised area relative to adjacent areas of the flat material section. This is advantageous from a mechanical point of view, particularly with regard to static and dynamic loads acting on the guide rail and transferred to the opposite section via the fastening element. The recessed and / or raised area, such as a groove or indentation, is preferably formed offset upwards relative to the operating state on the relevant leg of the fastening element connected to the rail body. The upwardly deformed or offset area preferably has an inclined material section that slopes downwards from the other leg towards the edge section or is shaped like a ramp, the upper surface of which is flat but inclined. The stabilization and / or stiffening of the fastening element achieved by the recessed and / or raised area is advantageous in use, for example, when a drawer with a comparatively large storage volume is heavily loaded on the associated guide system, adding an additional mass of, for example, over 50 kilograms to the weight of the empty drawer. The resulting considerable bending and / or torsional loads on the guide system are absorbed by one or preferably two fastening elements and transferred to the opposite section or a cabinet side panel. Preferably, two or more fastening elements are present on a guide rail, i.e., on a component of a partial or full extension slide. Drawers are generally mounted to the cabinet in a slidable manner by two components of a partial or full extension slide, i.e., one component on each long side of the drawer.It is also advantageous that the flat material section adjacent to the edge section has a lateral area, with both lateral areas lying on a common plane, and a raised flat material area between the two lateral areas. This is perpendicular to the end face of the edge section when viewed from the front. In this view, the edge profile resembles a cross-section of a hat or a "hat shape," with the lateral areas resembling a brim and the raised flat material area representing the crown of the hat. Compared to, for example, a straight line shape for the edge section, i.e., when the leg is a flat horizontal surface in its operating state, a particularly stable or mechanically robust guide rail can be achieved.to achieve a more durable connection between the fastening element and the surface of the rail body with the same amount of material. According to the invention, the edge profile has offset straight sections that are connected to each other via a step located between the straight sections. According to the invention, the straight sections comprise two lower straight sections and one straight section offset above them. The transition between two straight sections can be angular or curved. Such a shape also increases the stability of the guide rail or guide system. Furthermore, it is advantageous if the rail body is designed as a hollow profile enclosed by wall sections of the rail body. The hollow profile is preferably slotted or open at the top in its operating state. Preferably, the hollow profile has a bottom surface or a flat lower horizontal wall section, to which a wall section, preferably vertical in its operating state, projects upwards at right angles along each of its two longitudinal edges. At least one fastening element is firmly attached to the outside of one of the vertical wall sections. At the upper edge of each of the two vertical wall sections, an upper web section, angled inwards at, for example, 45 degrees, extends over the substantial length of the rail body.The free ends of the two web sections converge but remain separated by a width gap, so that the rail body is open along its length via a longitudinal slot at the top. Within the volume enclosed by the rail body, sections of a center rail are accommodated during full extension, with the center rail extending upwards through the longitudinal slot. A carriage with bearing elements is also housed between the walls of the hollow profile rail body and the walls of the center rail. With respect to the height of the vertical wall section that forms the upright surface of the rail body, two sections of the edge section, or rather its narrow end faces, are preferably located in the lower region, and one section is located slightly higher up on the upright surface. The lower boundary of the two lower sections of the edge section is preferably offset slightly upwards relative to the lower edge of the vertical wall section and thus to the underside of the horizontal wall section of the rail body. This advantageously ensures that the underside of the horizontal leg of the fastening element is offset slightly upwards relative to the underside of the rail body or the horizontal wall section. The underside of the horizontal leg of the fastener and the underside of the horizontal wall section can also be flush. According to the invention, the edge section has a hat-shaped profile in front view of the edge section with two lateral sub-areas and a raised central sub-area, such that the raised central sub-area of ​​the edge section is attached slightly upwards to the vertical wall section or the upright surface side of the rail body in comparison to the lateral sub-areas of the edge section. According to an advantageous embodiment, at least two fastening elements are attached to the rail body. Preferably, exactly two fastening elements are provided on the rail body, spaced apart from each other over a central section of the rail body. This allows the guide rail to be fixed to the opposite section with sufficient stability along its length. Preferably, one fastening element is provided in a rear end section of the rail body and another fastening element in a front end section of the rail body. The front fastening element is preferably mounted on the rail body with its front edge offset a short distance to the rear from the front edge of the rail body. Similarly, the rear fastening element is preferably mounted on the rail body with its rear edge offset a short distance to the front from the rear edge of the rail body. Furthermore, it is advantageous that the guide rail is made from a formed strip material. In particular, the guide rail is manufactured from sheet metal that is initially strip-shaped or rectangular through cold forming. The invention further relates to a guide system for a sliding element, in particular a linear guide system for a sliding element of a piece of furniture or a household appliance, such as a kitchen appliance, wherein the guide system comprises a unit with exactly two guide rails, wherein the unit has a cabinet rail and a sliding element rail slidably mounted on the cabinet rail, which is designed for connection with the sliding element, wherein a bearing arrangement is provided between sections of the cabinet rail and sections of the sliding element rail for relative movement of the cabinet rail and the sliding element rail, wherein the cabinet rail is designed as a guide rail according to one of the above-mentioned embodiments. This concerns a guidance system designed as a so-called partial extension. The partial extension thus offers the advantages discussed above, particularly regarding the stability of the guidance system. The invention relates in particular to a furniture guide system or a furniture drawer guide system, such as a furniture drawer guide system or a household appliance drawer guide system, such as a kitchen appliance guide system. The bearing arrangement is in contact with the cabinet rail on one side and with the drawer rail on the other. For example, carriages with bearing bodies, such as rolling bearings, are used as the bearing arrangement. The invention further relates to a guide system for a sliding element, in particular a linear guide system for a sliding element of a piece of furniture or a household appliance, such as a kitchen appliance, wherein the guide system comprises a cabinet rail, a sliding element rail designed for connection with the sliding element, and a central rail located between the cabinet rail and the sliding element rail, wherein a bearing arrangement is provided between sections of the cabinet rail and the central rail and a bearing arrangement between sections of the central rail and the sliding element rail for relative movement between the rails, wherein the cabinet rail serves as a guide rail according to one of the embodiments described above. This provides a so-called full extension with telescopically movable rails, whereby the aforementioned advantages of the guide system can be realized. The invention relates in particular to a furniture drawer guide system and a household appliance drawer guide system designed as a full extension. It is advantageous that the guide system is designed as an underfloor guide system, wherein the drawer element rail is designed such that an underside of a drawer element's base can be supported on the drawer element rail in the guide system's operating state, preferably on an upper side of the drawer element rail. The lateral distance between an inner side of a cabinet side panel and the opposite, adjacent side panel of the drawer element, such as a drawer side panel, can thus be advantageously minimized. Finally, it is advantageous that the guide system is designed as a hollow-chamber drawer guide system, wherein the guide system is designed such that it can be accommodated, at least substantially, within the internal volume of a hollow-chamber drawer frame. The hollow-chamber drawer frame is specifically designed as a sheet metal component for furniture drawers and has a cavity open from below in its lower section, so that essential sections of the guide rail or guide system can be recessed into the drawer frame cavity. This results in a particularly compact design. Only a narrow lower part of the cabinet rail and the fastening element, for example, are located outside the surface of the hollow-chamber drawer frame. The invention further relates to a piece of furniture or household appliance, such as a kitchen appliance, comprising a body and a drawer element, wherein the drawer element is movably mounted on the body by means of a guide system, and wherein a guide system according to the invention is provided for the drawer element according to one of the embodiments discussed above. This allows the advantages outlined above to be achieved in the furniture or household appliance. Character description Further features and advantages of the invention are explained in more detail with reference to the exemplary embodiments of the invention shown in the figures. Specifically: Fig. 1 shows a schematic representation of a piece of furniture according to the invention in a perspective view from above, with a drawer slidably mounted thereon; Fig. 2 shows a cross-sectional perspective view of a piece of furniture according to the invention in the area of ​​a drawer side, adjacent to a furniture carcass wall and a furniture carcass base; Fig. 3 shows the section according to Fig. 2 in an end view; Fig. 4 shows an exploded view of a component of a guide system according to the invention; Fig. 5 shows one of the guide rails shown in Fig. 4 in an end view; Fig. 6 shows the guide rail according to Fig. 5 in a perspective view from above; Fig. 7 shows an end section of the guide rail according to Figs. 5 and 6 in perspective; Fig. 8 shows the guide rail shown in Figs. 5, 6 to 7 in the view according to Fig. 6.4 in the state before a joining process of the elements of the guide rail and Fig. 9 the rail body according to Fig. 8 in side view. For corresponding elements of different embodiments, the same reference symbols are sometimes used below. Fig. 1 shows a highly schematic representation of a piece of furniture 1 according to the invention in a functional state, comprising a hollow, cuboid furniture body 2 and a drawer element designed as a drawer 3, wherein the drawer 3 is slidably mounted on the furniture body 2. The furniture body 2 includes two opposing vertical side walls 4 and 5, between which the drawer 3 can be pulled out of the furniture body 2 in a horizontal direction according to P1 and pushed in in the opposite direction according to P2 via a guide system according to the invention with telescopic guide elements or a first full-extension rail 6 and a second full-extension rail 7. In Fig. 1, the drawer 3 is shown in the state of being maximally or completely extended from the interior of the furniture body 2. This allows almost unimpeded access to the storage volume of the drawer 3 from above. If drawer 3 uses partial extension slides instead of full extension slides 6 and 7, it cannot be moved as far out of the interior of the furniture carcass 2 towards P1 when fully extended, as is possible with full extension slides 6 and 7 as shown in Fig. 1. The front element 12 is then closer to the open front of the furniture carcass 2 than shown for drawer 3 in Fig. 1. The full extension rail 6, screwed to the inside of the side wall 4, is located opposite at the same vertical height as the full extension rail 7, which is screwed to the side wall 5 and hidden in Fig. 1, and which is indicated by dashed lines. In the furniture body 2, above the drawer 3, a further drawer can be accommodated, guided accordingly by rail full extensions 8 and 9, which is not shown in Fig. 1. Drawer 3 has opposing drawer side walls 10, 11, each comprising a constructed hollow chamber frame. Drawer 3 also includes a front element 12, a back wall 13 horizontally opposite it, and a horizontally extending drawer base 14, which extends to or is connected with the drawer side walls 10, 11, the front element 12, and the back wall 13. Figures 2 and 3 show a section of a drawer 3 in the area of ​​a cabinet side panel 5, comprising a drawer bottom 14, a drawer side panel 11 designed as a hollow chamber frame 15, and a back panel 13. The drawer 3 is mounted on the cabinet body 2 via two components of a guide system according to the invention, or via a full-extension slide 16 according to the invention on the side panel 5, and in the same way via a further hollow chamber frame of the drawer 3 on the side panel 4 (not shown in Figure 2). On the side panel 4, the drawer 3 is mounted via a further component or a further full-extension slide according to the invention, allowing it to be linearly displaceable horizontally in directions P1 and P2. The hollow chamber frame 15, preferably made of bent sheet metal, has an outer housing 15a and an inner structure 15b, such that the full extension 16 can be recessed within the inner volume of the hollow chamber frame 15. On an inner surface of the hollow chamber frame 15 in its lower section, this surface is designed to receive a longitudinal edge of the drawer base 14. The full extension 16 according to the invention, formed as a component of the guide system, comprises three mutually telescopic guide rails or a body rail 17, a middle rail 18 and a sliding element rail 19. The middle rail 18 is designed as a hollow profile according to the invention. A movable drawer element, such as the drawer 3, is coupled or connected to the drawer element rail 19, for example, fixed to the hollow chamber frame 15, whereas the cabinet rail is connected to the fixed part of the furniture. If the full extension 16 is used as an under-mount guide, the underside of a drawer element, or its bottom, rests on a top surface 19a of the drawer element rail 19. A hook element 19b projecting upwards from the rear end of the drawer element rail 19 forms a stop for a section of the rear outer surface of the drawer element. For precise positioning, a section of the hook element 19b angled parallel to the top surface 19a engages in a correspondingly prepared recess in the rear outer surface of the drawer element. Thus, in Fig. 4, the rear portion of the full extension 16, shown on the left side, is also defined in the operating state.A front area of ​​the full extension 16 is defined in the operating state, on the right side in Fig. 4. A horizontal linear sliding direction 30 of the rails 18 and 19 forwards and backwards in the operating state of the full extension 16 is indicated in Fig. 4 by a double arrow. Furthermore, the full extension 16 includes a first or lower carriage 20 with bearing bodies arranged on it, wherein the carriage 20 acts between the body rail 17 and the middle rail 18 for a load-transmitting relative movement of the rails 17, 18. Furthermore, the full extension 16 comprises a second or upper carriage 21 with bearing bodies arranged on it, wherein the carriage 21 acts between the middle rail 18 and the push element rail 19 for a load-transmitting relative movement of the rails 18, 19. Pins 32 are provided on a vertically oriented, inwardly pointing narrow side of a rail body 31 of the cabinet rail 17, via which a movement mechanism 22 of the full extension 16, for example for pushing out and / or pulling in the drawer 3, can be attached. The cabinet rail 17 includes two L-shaped fastening elements 33 and 34, the fastening elements 33 and 34 serving to fasten or fix the full extension 16 to an inside of the side wall of a cabinet, such as the inside 5a of the side wall 5 of the cabinet 2 of the furniture 1. In the embodiment shown in Fig. 3, the fastening elements 33 and 34 have a significantly shortened horizontal leg with a width B0. This minimizes the distance between the outside of the hollow chamber frame 15 and an inside 5a of the side wall 5, thus maximizing the storage volume of the drawer 3. The guide rails 17, 18, 19 preferably consist of a sheet metal material which, starting from the flat sheet metal material, is formed into the final product of the respective guide rail, for example by a punching and bending process. To limit the relative movement of the lower carriage 20 and the upper carriage 21 along the longitudinal extension of the central rail 18 in relation to a central longitudinal axis L (see Fig. 4), upper stops 35 and lower stops 36 are provided on the central rail 18. In the assembled full extension 16, the bearing bodies mounted on the carriages 20, 21 run on the outwardly facing sides of the center rail 18 or the horizontal wall sections 23, 24 and the side wall sections 25-28. The lower carriage 20, with its sections 20a and 20b carrying the bearing bodies, encompasses the horizontal wall section 24 and the side wall sections 27, 28 on the outside. The upper carriage 21, with its sections 21a and 21b which support the bearing bodies, surrounds the horizontal wall section 23 and the side wall sections 25, 26. Accordingly, the respective associated bearing bodies of the lower carriage 20 roll on the distal side of the lower horizontal wall section 24, on the outside of the side wall section 27 and on the outside of the side wall section 28. The respective associated bearing bodies of the upper carriage 21 roll on the distal side or outside of the upper horizontal wall section 23, on the outside of the side wall section 25 and on the outside of the side wall section 26. The bearing bodies of the carriages 20, 21 are preferably externally cylindrical bearing bodies or rolling bearing bodies such as bearing rollers or bearing needles. The central rail 18, originally formed from a flat sheet metal, is shaped as a hollow profile and has a material-bonded connection, a welded joint, or a narrow weld seam 29 along its length along the longitudinal axis L. The weld seam 29, preferably created using a continuous laser process, joins narrow, butt-jointed edges of a lower and an upper section of the central rail 18 on one side. The hollow profile shape of the center rail 18 enables a mechanically highly stable center rail 18, in particular one that is stiff in bending and torsion. Furthermore, the middle rail 18 is designed to be compact, space-saving and material-saving. The fastening element 33 is materially bonded to the rail body 31, preferably by a welding process such as a laser welding process. In the embodiment shown in Figs. 2, 3, 4, 5, 6, 7, 8 to 9, exactly two identical fastening elements 33, 34 are provided on the rail body 31 of the cabinet rail 17. The fastening elements 33, 34 are L-shaped in their basic form. The following description of fastening element 33 applies accordingly to fastening element 34. The fastening element 33 has a length L, height H, and a greater width B than the fastening element 33 shown in Fig. 3 (see Fig. 5, Fig. 8). The material thickness a (see Fig. 5) of the fastening element 33 is, for example, preferably in the range of approximately 1 to approximately 1.5 millimeters. The width of the rail body 31 is comparable to the width B of the fastening element 33. The two-pronged fastening element 33 has a leg 37 that is horizontally oriented in the usable state of the full extension 16 and a vertical leg 38. The vertical leg 38 and the horizontal leg 37 preferably form an angle α of 90 degrees with their planar main plane. The fastening element 33 is mirror-symmetrical with respect to the plane of mirror symmetry E (see Fig. 8), which is transverse or perpendicular to the longitudinal axis A of the fastening element 33 and bisects the fastening element 33 exactly at its midpoint. The longitudinal axis A of the fastening element 33 is parallel to the longitudinal axis of the full extension 16 or to the longitudinal axis A1 of the rail body 31. In the upper section of the vertical leg 38, six adjacent mounting holes 39, such as screw holes for screwing onto a counter section, such as the vertically standing side wall 5 of the furniture body 2, are provided along the longitudinal extension of the fastening element 33. The rail body 31 comprises a base section 40, vertical wall sections 41 and 42 angled upwards at right angles in cross-section along both longitudinal sides of the base section 40, and longitudinal webs 43, 44, which are each angled inwards towards the wall section 41 and 42 at the upper end of the associated wall section 41 and 42 respectively. At the front and rear ends of the rail body 31, two stops 45 are formed by bent tongues on the longitudinal webs 43, 44. The fastening element 33 is butt-jointed to the rail body 31 via an end-face edge section 46, which belongs to an edge 48 of the horizontal leg 37. The edge 48 defines a free end of the leg 37, located away from a bend 47 of the fastening element 33. The edge section 46 is formed by a flat, narrow end face of the edge 48, which is perpendicular to the upper and lower surfaces of the horizontal leg, which are opposite surfaces. The edge section 46 butts against the vertical wall section 41, or rather its vertical outer surface. The fastening element 33 is welded to the wall section 41 via this butt-jointing contact. The weld is established via the welding areas 49, 50 and 51 shown in Fig. 9. Along the hat-shaped edge section 46, which is approximated in frontal view, the fastening element 33 and the rail body 31 are connected to each other. The rim section 46, with its hat-like shape when viewed from the front, is formed by two lateral flat areas 53, 54 and an upwardly deformed or raised area 52 located between them, which extends to the bend 47 or to the vertical leg 38. The upper surface of area 52 on the horizontal leg 37 slopes down from the vertical leg 38 towards the free rim 48 or is slightly obliquely oriented. Advantageously, this results in two different heights for the weld areas 49 and 50 on the one hand, and the weld area 51 on the other, on the outside of the wall section 41, where the edge section 46 is welded. At a lower height, the two sections of the edge section 46 formed laterally by the area 52 are connected to the weld areas 49 and 50. The section of the edge section 46 belonging to the area 52 is connected to the weld area 51 at a higher height on the wall section 41. The fastening elements 33, 34 are set back from the end of the rail body 31 by the amount or offset V1 (see Fig. 6). One underside of the leg 37 and one underside of the bottom section 40 have an offset V2. The offsets V1, V2 are advantageous for manufacturing and stability reasons. Reference symbol list: 1 Furniture 2 Furniture carcass 3 Drawer 4 Side panel 5 Side panel 5a Inside 6 Full extension slide 7 Full extension slide 8 Full extension slide 9 Full extension slide 10 Drawer side panel 11 Drawer side panel 12 Front element 13 Back panel 14 Drawer bottom 15 Hollow chamber frame 15a Housing 15b Internal structure 16 Full extension 17 Carcass rail 18 Center rail 19 Drawer element rail 19a Top 19b Hook element 20 Trolley 20a Section 20b Section 21 Trolley 21a Section 21b Section 22 Movement mechanism 23 Horizontal wall section 24 Horizontal wall section 25 Side panel section 26 Side panel section 27 Side panel section 28 Side panel section 29 Weld 30 Sliding direction 31 Rail body 32 Pin 33 Fastener 34 Fastener 35 Stop 36 Stop 37 Leg 38 Leg 39 Mounting hole 40 Bottom section 41 Wall section 42 Wall section 43 Longitudinal web 44 Longitudinal web 45 Stop 46 Edge section 47 Bend 48 Edge 49 Weld area 50 Weld area 51Welding area 52 Area 53 Flat area 54 Flat area

Claims

Guide rail (17) of a guide system for a sliding element, in particular for a sliding element (3) of a piece of furniture (1) or a household appliance, such as a kitchen appliance, wherein the guide rail (17) comprises a rail body (31) and a fastening element (33, 34), wherein the fastening element (33, 34) is configured to fasten the guide rail (17) to a counterpart section in the operating state of the guide system, wherein the fastening element (33, 34) is connected to the rail body (31), and wherein the fastening element (33, 34) has a flat material section with opposing main sides and a narrow end-face edge section (46) between the main sides, wherein, in the connected state of the fastening element (33, 34) with the rail body (31), the edge section (46) of the fastening element (33, 34)34) is butt-jointed with a surface side (41) of the guide rail (17) which is oriented upright in the operating state, wherein the edge section (46) has straight sections offset from one another which are connected to each other via a step located between the straight sections, characterized in that the straight sections comprise two lower sections and one straight section offset upwards thereto, wherein the edge section (46) has a hat-shaped profile in front view of the edge section (46) with two lateral sub-areas and a raised central sub-area. Guide rail according to claim 1, characterized in that the connection of the fastening element (33, 34) with the rail body (31) is provided exclusively by the butt joint connection of the edge section (46) of the fastening element (33, 34) with the surface side (41) on the rail body (31). Guide rail according to claim 1 or claim 2, characterized in that the fastening element (33, 34) in its basic form is designed as an angle element with two legs (37, 38) oriented at an angle to each other, wherein one leg (37) has the flat material section with the opposite main sides and the narrow edge section (46). Guide rail according to one of the preceding claims, characterized in that the edge section (46) of the fastening element (33, 34), which is butt-jointed with the upright oriented surface side (41) on the rail body (31), is designed in a strip shape. Guide rail according to one of the preceding claims, characterized in that the shape of the edge section (46) is determined by the shape of the flat material section of the fastening element (33, 34) adjacent to the edge section (46). Guide rail according to one of the preceding claims, characterized in that the flat material section adjacent to the edge section (46) comprises a recessed and / or raised area compared to adjacent areas of the flat material section. Guide rail according to one of the preceding claims, characterized in that the flat material section adjacent to the edge section (46) has a lateral area (53, 54) in each case, wherein the two lateral areas (53, 54) lie on a common plane, and between the two lateral areas (53, 54) there is a raised flat material area (52). Guide rail according to one of the preceding claims, characterized in that the rail body (31) is designed as a hollow profile enclosed by wall sections (40, 41, 42, 43, 44) of the rail body (31). Guide rail according to one of the preceding claims, characterized in that at least two fastening elements (33, 34) are attached to the rail body (31). Guide rail according to one of the preceding claims, characterized in that the guide rail (17) is formed from a formed strip material. Guide system for a sliding element, in particular a linear guide system for a sliding element (3) of a piece of furniture (1) or a household appliance, such as a kitchen appliance, wherein the guide system comprises a unit with exactly two guide rails, wherein the unit has a cabinet rail and a sliding element rail slidably mounted on the cabinet rail, which is designed for connection with the sliding element (3), wherein a bearing arrangement is provided between sections of the cabinet rail and sections of the sliding element rail for relative movement of the cabinet rail and the sliding element rail, characterized in that the cabinet rail is designed as a guide rail according to one of the preceding claims. Guide system (16) for a sliding element, in particular a linear guide system for a sliding element (3) of a piece of furniture (1) or a household appliance, such as a kitchen appliance, wherein the guide system (16) has a cabinet rail (17), a sliding element rail (19) designed for connection with the sliding element (3), and a central rail (18) located between the cabinet rail (17) and the sliding element rail (19), wherein a bearing arrangement (20) between sections of the cabinet rail (17) and the central rail (18) and a bearing arrangement (21) between sections of the central rail (18) and the sliding element rail (19) are provided for relative movement between the rails (17-19), characterized in that the cabinet rail (17) is designed as a guide rail according to one of claims 1 to 10. Guide system according to one of the preceding claims 11 and 12, characterized in that the guide system is designed as an underfloor guide system, wherein the push element rail is designed such that an underside of a bottom (14) of the push element (3) can be supported on the push element rail in the operating state of the guide system. Guide system according to one of the preceding claims 11 and 12, characterized in that the guide system (16) is designed as a hollow chamber frame guide system, wherein the guide system (16) is designed such that the guide system (16) can be accommodated at least substantially within an inner volume of a hollow chamber frame (15). Furniture (1) or household appliance, such as a kitchen appliance, comprising a body (2) and a drawer element (3), wherein the drawer element (3) is movably received on the body (2) by means of a guide system (16), characterized in that a guide system (16) for the drawer element (3) according to one of claims 11 to 14 is provided.

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