DRAWER PULL-OUT VERSION

Description

[0001] The present invention relates to a drawer pull-out guide for the movable mounting of a drawer on a furniture body, comprising: a carcass rail to be fastened to the furniture carcass, at least one drawer rail to be connected to the drawer, which is mounted displaceably in a longitudinal direction relative to the carcass rail, optionally at least one middle rail which is arranged between the carcass rail and the at least one drawer rail, wherein the drawer pull-out guide has a dead weight and a maximum load capacity.

[0002] The rails of a drawer slide are often made from a flat sheet of metal, which is then bent and / or formed into a profile rail. The finished profiles absorb the loads of the drawer slide in both horizontal and vertical directions, ensuring stable movement of the drawer connected to the drawer slide. Relevant prior art can be found in document EP2241218A1.

[0003] A general problem is the amount of metal required to manufacture drawer slides. High material usage leads to high weight and increased costs in serial production. It is therefore desirable to use as little metal as possible, especially since resource-efficient use of raw materials brings both ecological and economic benefits.

[0004] The object of the present invention is to provide a drawer pull-out guide of the type mentioned at the outset, in which the problems of the prior art mentioned are at least partially avoided.

[0005] This is achieved according to the invention by the features of patent claim 1. Further advantageous embodiments of the invention are specified in the dependent claims.

[0006] According to the invention, it is provided that the ratio of the dead weight of the drawer pull-out guide to the maximum load capacity of the drawer pull-out guide is less than 1 to 50, preferably less than 1 to 57, particularly preferably less than 1 to 65.

[0007] Until now, experts in the furniture fittings industry have assumed that a specific material requirement is required to create a drawer slide that exhibits a certain level of stability at a given maximum load capacity. For example, conventional drawer slides from the applicant have a ratio of the drawer slide's own weight to its maximum load capacity of 1 to 40 or more. Lower ratios appeared to be impractical.

[0008] In the context of the invention, the applicant's experts have surprisingly discovered, contrary to this expectation, that it is possible to move towards a completely different regime in the design of drawer slides.

[0009] In this way, the use of materials can be significantly reduced, for example by halving it, which, particularly in view of the high volumes common in the furniture fittings industry, is accompanied by a considerable reduction in production costs and, at the same time, a considerable conservation of resources.

[0010] It should be noted that the technical testing and evaluation of drawer slides is standardized, at least in Europe. In this context, reference should be made to the DIN EN 15338 standard, which specifies the strength and durability of slides and their components. However, this standard does not specify the ratio of dead weight to the maximum load capacity of a drawer slide.

[0011] The maximum load capacity is not an arbitrary value, but rather determined by a specialist. The maximum load capacity is usually also indicated on the drawer slide, e.g., by embossing.

[0012] According to the invention, the at least one drawer rail is displaceable relative to the carcass rail over an extension length between a retracted end position and an extended end position, the at least one drawer rail has a front end to be connected to a front panel of the drawer and the front end of the at least one drawer rail is in the extended end position

[0013] Can be lowered by a maximum of 4% of the extension length at a load corresponding to the maximum load capacity.

[0014] The invention is particularly advantageously suited for a drawer slide that, when fully retracted, has a length between 200 mm and 650 mm, and / or a dead weight between 125 g and 550 g, and / or a maximum load capacity between 15 kg and 35 kg, and / or is made at least predominantly of steel. According to a specific embodiment, the drawer slide can have a maximum load capacity of 25 kg, a length of 500 mm, and a dead weight of approximately 350 g.

[0015] Alternatively or additionally, it can be provided that at least one rolling body is arranged between the carcass rail and the at least one drawer rail, preferably wherein the at least one rolling body is mounted so as to be rotatable about an axis of rotation, particularly preferably wherein the axis of rotation is aligned transversely to the longitudinal direction, and / or at least one carriage, in particular made of plastic, is provided, in which the at least one rolling body is arranged, and / or the at least one rolling body is essentially cylindrical, and / or the at least one rolling body consists at least predominantly of plastic. Such a drawer pull-out rail differs significantly in its design from other drawer pull-out rails, such as heavy-duty pull-outs or ball bearing guides.

[0016] It has proven advantageous that the drawer slide is formed, at least in sections, from a flat sheet metal with a material thickness between 0.5 mm and 1.0 mm, preferably 0.7 mm. This allows for a significantly thinner sheet metal to be used than in a conventional drawer slide with a comparable design.

[0017] According to the invention, the low ratio of the dead weight of the drawer pull-out guide to the maximum load capacity of the drawer pull-out guide compared to the prior art can be achieved by the drawer pull-out guide having at least one, preferably more than one, property selected from the following group of properties i. to v.: Property i.: At least one of the rails has, in a cross-section normal to the longitudinal direction, at least one profile formed from at least one flat sheet with two parallel longitudinal edges, wherein the profile has at least one fold with at least twice the material thickness on at least one longitudinal edge, preferably on both longitudinal edges. Property ii.: the carcass rail has at least one fastening section with a fastening side which can be placed at least partially against the furniture carcass when the drawer pull-out guide is mounted on the furniture carcass, wherein the at least one fastening section has at least one, preferably circular, opening for the passage of a fastening means, preferably a screw, wherein the at least one opening is surrounded on a second side spaced from the fastening side by a material thickness of the fastening section by a bead which projects transversely from the second side of the fastening section. Property iii.: at least one of the rails has, in a cross-section normal to the longitudinal direction, a profile formed from at least one flat sheet metal, wherein at least one, in particular two, end faces of the profile are designed with a taper. Property iv.: at least one of the rails has, in a cross-section normal to the longitudinal direction, at least one profile formed from at least one flat sheet with two longitudinal edges running parallel to one another, wherein at least one embossing extending at least partially over at least two side surfaces of the profile arranged essentially orthogonally to one another is arranged to stiffen the profile, wherein the side surfaces are arranged in the longitudinal direction and the at least one embossing is arranged essentially orthogonally to the longitudinal direction. Property v.: at least one of the rails has, in a cross-section normal to the longitudinal direction, at least one profile formed from at least one flat sheet with two longitudinal edges running parallel to one another, wherein at least two embossed portions are provided, preferably arranged at least in regions on at least two substantially orthogonally oriented and / or adjacent side surfaces and / or extending over at least two side surfaces, wherein the at least two embossed portions point alternately in the direction of an inner region and in the direction of an outer region of the at least one rail, in particular wherein the at least two embossed portions are adjacent to one another in the longitudinal direction.

[0018] The property i. is associated with the following technical advantages: on the one hand, a simple bending process of the sheet metal is possible, and on the other hand, the rigidity of the profile in the area of ​​the fold can be increased. The fold creates a rounded edge which reduces the risk of injury from an otherwise sharp longitudinal edge. Thinner sheets than usual can be used to manufacture the drawer slide (e.g. sheets with a thickness of 0.7 mm instead of sheets with a thickness of 1.5 mm). The at least one fold can increase the rigidity of the highly stressed areas of the carcass rail and / or the drawer rail and / or the middle rail.The highly stressed areas include in particular the raceways of the cabinet rail and / or the drawer rail and / or the center rail, on which rolling elements (in particular rolling elements of a carriage) can roll. Assuming, for example, that a thinner sheet metal with a thickness of 0.7 mm is used, the highly stressed areas have a thickness of 1.4 mm due to the fold over. The resilient raceways allow the rolling elements to be guided optimally along the rails. The remaining areas of the rails, which are not exposed to great loads, can, however, be made with a simple, reduced material thickness (i.e. 0.7 mm thick). These measures can significantly reduce the material used, the weight and the costs for manufacturing the drawer pull-out guide.

[0019] In connection with property i., it has proven advantageous that the at least one turn-up is arranged on at least one longitudinal edge of the carcass rail, wherein the turn-up can be placed on the furniture carcass when the carcass rail is fastened, and / or has at least two sheet metal sections which at least partially abut one another on the at least one longitudinal edge, preferably wherein the at least two sheet metal sections have at least one common punching, and / or has at least one kink running in the longitudinal direction on the at least one longitudinal edge in a cross-section normal to the longitudinal direction, preferably wherein the at least one turn-up is formed on at least one longitudinal edge of the carcass rail.

[0020] Alternatively or additionally, it can be provided that the drawer pull-out guide has at least one rolling element which can be moved at least in sections in the longitudinal direction along the at least one cover.

[0021] Furthermore, in connection with property i., it may be advantageous for the at least one drawer rail to have at least one cover with at least twice the material thickness on both longitudinal edges, wherein the two covers are aligned transversely, preferably substantially at right angles, to one another and / or wherein one of the two covers faces inwards and the other of the two covers faces outwards.

[0022] Property ii. is associated with the following technical advantages: The opening is surrounded on the side of the fastening section facing the screw head by a preferably annular bead, which is intended to at least partially accommodate the screw head. The screw head can therefore be at least partially, preferably substantially completely, countersunk within the bead. The bead reinforces the peripheral edge of the opening, i.e., the force emanating from the underside of the screw head can be distributed over a larger area. The bead can reduce the sinking of the screw head into the thin-walled metal of the fastening section.The risk of damage to the peripheral edge of the opening can therefore be reduced in this way. If the bead is produced, for example, in the form of an embossed portion, a corresponding recess is created on the fastening side of the fastening section, into which the chip material protruding from the furniture part can be at least partially accommodated. This also reduces the risk of the chip material penetrating between the fastening side of the fastening section and the furniture part, thus leading to an undesirable spacing of the fastening section from the furniture part.

[0023] In connection with property ii., it has proven advantageous that the bead is substantially toroidal in cross-section and / or is formed integrally with the at least one fastening section and / or is produced by embossing in the at least one fastening section.

[0024] Property iii. is associated with the following technical advantages: the taper can be generated without a machining process with a resulting cutting width - for example by mechanical breaking, bending and / or splitting - whereby material in the form of cutting scrap can be saved and / or a degree of deformation during a cutting process for the production of the drawer pull-out guide can be reduced, a risk of injury, in particular due to burrs, is reduced for a user of the drawer pull-out guide and / or a fitter during installation or maintenance work on the drawer pull-out guide, whereby machining post-processing steps are not absolutely necessary.

[0025] In connection with property iii., it has proven advantageous that the taper comprises an angle in the range between 60° and 140°, preferably between 75° and 105°, particularly preferably substantially 90°, wherein it is preferably provided that at least one, preferably both, end surfaces are designed to be substantially burr-free, and / or has a tapered cross-section parallel to the longitudinal extent of the sheet, substantially in the form of a, preferably isosceles, triangle, wherein it is preferably provided that the tapered cross-section is designed to be convex and / or concave.

[0026] For example, identical or different depths and / or geometries can be used for at least one notch in the sheet metal, which manifests itself as a taper in the drawer slide. The taper geometry can be flexibly adjusted via the notch geometry. The taper can act as a defined predetermined breaking point for tearing and / or breaking off.

[0027] Properties iv. and v. are associated with the following technical advantages: The drawer slide is stiffened beyond a local increase in strength / stability, whereby in particular section moduli and / or moments of inertia are increased and / or vibrations as well as deformations generated by pressure, tension, torsion, bending, etc. are reduced. The positioning of the at least one embossing in the longitudinal direction can be flexibly adapted to the requirements of the drawer slide, so that areas of the drawer slide with particularly high loads are also provided with particularly high stability or strength due to the structural design via the at least one embossing. The degree of possible weight reduction of the drawer slide is higher than the degree of the weight class reduction (or weight reduction) of the furniture parts to be moved by the drawer slide resulting from the weight reduction.which are in mechanical interaction with the drawer slide, whereby, for a given weight class (or weight) of furniture parts to be moved by the drawer slide, material savings can be exploited by reducing the wall thickness of the sheet metal used to form the drawer slide and / or heavier furniture parts can be moved compared to conventional drawer slides - especially with the same service life and proper use - a force distribution, especially during a bending process to form the drawer slide and / or during use of the rail, can be influenced particularly favorably in regions of the drawer slide subject to high stress, whereby, in particular, a geometric accuracy of the drawer slide can be ensured to a particularly high degree,With an alternating arrangement of embossments (relative to adjacent side surfaces and / or relative to the interior / exterior area), the bending process from a flat sheet to a profile shape of the drawer pull-out guide can be facilitated in order to be able to produce a profile with particularly high geometric precision, which can be maintained over the duration of the drawer pull-out guide's use, gaping transversely to the longitudinal direction of the drawer pull-out guide, whereby an angle between the side surfaces of the profile increases undesirably under load, and / or deformation detrimental to the functionality of the drawer pull-out guide, particularly in the longitudinal direction, is effectively counteracted, whereby no additional components are required to achieve the technical effects.

[0028] The embossing can also be referred to as a beading or as a stiffening bead in the sense of a plastic deformation as work hardening, which is driven into a sheet or a profile in order to increase stability or strength - in particular by increasing section moduli and / or moments of inertia and / or reducing vibrations as well as deformations generated by pressure, tension, torsion, bending, etc.

[0029] In connection with the properties iv. and v. it has proven advantageous that at least one carriage with at least one rolling element and / or sliding element is arranged or can be arranged on the drawer pull-out guide, wherein the at least one embossing is arranged on the at least one carcass rail and / or the at least one drawer rail in such a way that the at least one embossing can be passed through the at least one carriage and / or the at least one rolling element and / or sliding element in the longitudinal direction without contact.

[0030] This ensures user-friendly guidance of the drawer pull-out guide, wherein the movement of at least one carriage is not impaired by the at least one embossing.

[0031] Alternatively or additionally, it can be provided that exactly three embossments for stiffening the profile are arranged at least in regions on at least two substantially orthogonally arranged side surfaces of the at least one rail.

[0032] In the current state of the art, thin material thicknesses are associated with significant performance losses and / or reduced service life during rail operation. By using three alternating thicknesses relative to adjacent side surfaces and / or relative to an inner and an outer area of ​​at least one rail—in particular, drawer rails, cabinet rails, and / or center rails—thin material thicknesses can also be used for rails with high load requirements or heavy, movable furniture components.

[0033] It has proven particularly advantageous that the at least two embossments are arranged on the same side surface or extending over at least two side surfaces on the same side surfaces and / or alternately on the at least two side surfaces, wherein it is preferably provided that the at least two embossments are arranged in a transition region of the at least two side surfaces alternately relative to the inner region and the outer region.

[0034] For example, embossments can be arranged on a side surface that are alternately oriented toward the interior and exterior areas. Alternatively or additionally, one of the embossments can extend across two side surfaces and / or an alternating arrangement of the embossments can be provided relative to the side surfaces, with two adjacent embossments being oriented substantially orthogonally to each other.

[0035] According to one embodiment, it can be provided that at least, preferably in the case of groups present, exactly two embossments point in the direction of the inner region of the at least one rail and one embossment is arranged centrally between the at least two embossments and points in the direction of the outer region of the at least one rail in order to increase a tensile / compressive load capacity.

[0036] By increasing the number of embossings, the tensile / compressive load capacity of the rail is successively increased. Alternating embossings, and in particular a embossing oriented centrally between two embossings in opposite directions (inside or outside), allow a rail to withstand particularly high forces without plastic and / or improper elastic deformation. Furthermore, the at least one embossing can serve as a support during assembly of the drawer slide.

[0037] And finally, in connection with properties iv. and v., it is advisable for the at least one embossing to extend in the orthogonal direction relative to the longitudinal direction of the at least one rail over an area between one third and three quarters of the side surface and / or over an area of ​​less than one third, preferably one quarter, of a side surface adjacent to this side surface.

[0038] In general, the at least one embossed portion can extend orthogonally to the longitudinal direction across an entire side surface, whereby such a structural design is generally not necessary due to lower loads on free longitudinal edges. In particular, with an alternating arrangement of embossed portions with respect to the side surfaces, the extent of the individual embossed portions with respect to a side surface can be reduced, since both side surfaces are reinforced by embossed portions. This can enhance an aesthetic appearance and / or reduce manufacturing costs. The at least one embossed portion can end in a transition region of the side surfaces or extend beyond it.

[0039] Further details and advantages of the present invention will become apparent from the following description of the figures. Fig. 1a shows a piece of furniture with drawers in a perspective view, Fig. 1b shows a piece of furniture with an extended drawer in a side view, Fig. 2 shows a drawer pull-out guide in a perspective view, Fig. 3a, 3b show a cross-section of the drawer pull-out guide without and with carriage, Fig. 4a, 4b show the body rail of the drawer pull-out guide in a perspective view from a first angle and in a cross-sectional view, Fig. 5a, 5b, 5c show the body rail of the drawer pull-out guide in a perspective view from a second angle, in a side view from the front and in a side view from the rear, Fig. 6a, 6b show the drawer rail of the drawer pull-out guide in a perspective view and in a side view from the front, and Fig. 7a, 7b, 7c show a method for producing a profile of a rail of the Drawer pull-out guide.

[0040] Fig. 1a shows a perspective view of a piece of furniture 1 with a furniture body 2, wherein drawers 3 are mounted so as to be movable relative to the furniture body 2 via drawer guides 4. For clarity, the top drawer 3 is not shown. The drawers 3 each have a front panel 5, a drawer bottom 6, drawer side walls 7, and a rear wall 8.

[0041] The drawer extension guides 4 comprise a cabinet rail 9, which is to be attached to the furniture carcass 2 via a fastening section 11. Furthermore, at least one drawer rail 10 is provided, which is to be connected to the drawer 3 and which is mounted so as to be movable relative to the stationary cabinet rail 9.

[0042] If necessary, the drawer pull-out guide 4 can also have a central rail which can be moved between the carcass rail 9 and the drawer rail 10 and by means of which a full extension of the drawer 3 in relation to the furniture carcass 2 is possible.

[0043] The drawer side walls 7 can each have a hollow chamber profile 7a, which is connected or connectable to the at least one drawer rail 10 of the drawer pull-out guide 4.

[0044] Fig. 1b shows a side view of a piece of furniture 1 with an extended drawer 3. The at least one drawer rail 10 of the drawer extension guides 4, on which the drawer 3 is mounted, is displaceable relative to the cabinet rail 9 over an extension length (n) between a retracted end position and an extended end position.

[0045] The at least one drawer rail 10 has a front end connected to the front panel 5 of the drawer 3. In the extended end position, the front end of the at least one drawer rail 10 can be lowered by a maximum of 4% of the extension length (n) under a load corresponding to the maximum load capacity. The lowering of the front end is indicated by an arrow.

[0046] Fig. 2 shows a drawer slide 4 in a perspective view, showing the cabinet rail 9 to be attached to the furniture carcass 2 and the drawer rail 10 movable in the longitudinal direction (L). The cabinet rail 9 is attached to the furniture carcass 2 via a fastening section 11.

[0047] The fastening section 11 has a fastening side 19 which can be applied to the furniture body 2 at least in sections when the drawer pull-out guide 4 is mounted on the furniture body 2.

[0048] The fastening section 11 can have at least one, preferably circular, opening 12 for the passage of a fastening means 28, in particular a screw 28a, through which the fastening section 11 is to be fastened to the furniture body 2a.

[0049] The at least one opening 12 is surrounded on a second side 20 facing away from the fastening side 19 by a preferably annular bead 21 which projects transversely from the second side 20 of the fastening section 11.

[0050] This bead 21 allows the screw head of the screw 28a to be at least partially countersunk. Furthermore, the peripheral edge of the opening 12 is reinforced by the bead 21, reducing the risk of damage to the peripheral edge of the opening 12.

[0051] The fastening section 11 and / or the cabinet rail 9 and / or the drawer rail 10 can each have at least one embossed portion 13 (also called a bead or stiffening bead). At least one opening 12 for the passage of a screw 28a can be arranged between two embossed portions 13, thereby increasing the section modulus in this area.

[0052] Fig. 3a, 3b show a cross-section of the drawer pull-out guide 4 without and with carriage 22. Fig. 3a shows the drawer slide 4 in a cross-section perpendicular to the longitudinal direction (L). Visible are the cabinet rail 9, which is to be attached to the furniture carcass 2, and the drawer rail 10, which can be moved relative to the cabinet rail 9.

[0053] The fastening section 11 of the carcass rail 9 has a fastening side 19 which can be applied to the furniture carcass 2 at least in sections when the carcass rail 9 is fastened to the furniture carcass 2.

[0054] The cabinet rail 9 and / or the drawer rail 10 is or are made of a flat sheet metal with two longitudinal edges 14a, 14b (drawer rail 10) and 15a, 15b (cabinet rail 9) bent into a profile 9a, 10a. The flat sheet metal has a material thickness (X).

[0055] The flat sheet from which the profile 9a, 10a is formed can, for example, have a material thickness (X) between 0.5 mm and 1.0 mm, preferably a material thickness (X) of 0.7 mm.

[0056] The profile 9a of the cabinet rail 9 and / or the profile 10a of the drawer rail 10 has or have at least one turn-up 16, 17 with at least twice the material thickness (2X) on at least one longitudinal edge 14a, 14b, 15a, 15b, preferably on both longitudinal edges 14a, 14b, 15a, 15b. Preferably, the at least one turn-up 16, 17 has exactly twice the material thickness (2X).

[0057] If appropriate, the cover 16, 17 can also be folded three or more times, resulting in a three-fold or multiple-fold material thickness (X).

[0058] At least one cover 16, 17 can be arranged on a longitudinal edge 15b of the carcass rail 9, wherein this cover 16, 17 can be applied when the carcass rail 9 is fastened to the furniture carcass 2.

[0059] According to one embodiment, it can be provided that the at least one fold 16, 17 has at least two sheet metal sections 24a, 24b that are at least partially adjacent to one another on the at least one longitudinal edge 14a, 14b, 15a, 15b.

[0060] The at least one drawer rail 10 can have at least one turn-up 16, 17 with at least twice the material thickness (2X) on both longitudinal edges 14a, 14b, wherein the two turn-ups 16, 17 are aligned transversely, preferably substantially at right angles, to one another and / or wherein one of the two turn-ups 16, 17 faces inwards and the other of the two turn-ups 16, 17 faces outwards.

[0061] At least one turn-up 16, 17 can have at least one kink 18 running in the longitudinal direction (L) on the at least one longitudinal edge 14a, 14b, 15a, 15b in a cross-section normal to the longitudinal direction (L), preferably wherein the at least one turn-up 16, 17 is formed on at least one longitudinal edge 15a of the carcass rail 9.

[0062] The at least one fastening section 11 can have at least one, preferably circular, opening 12 for the passage of a fastening means 28 ( Fig. 2 ), preferably a screw 28a.

[0063] According to one embodiment, it can be provided that the at least one opening 12 on a second side 20 spaced from the fastening side 19 by a material thickness (X) of the fastening section 11 is surrounded by a bead 21 which projects transversely from the second side 20.

[0064] Due to the bead 21 surrounding the opening 12, the rigidity of the fastening section 11 in the area of ​​the opening 12 can be considerably improved, which is particularly advantageous when used with sheets with a thin material thickness (X).

[0065] At least one embossment 13 can have a longitudinal direction extending transversely to the longitudinal direction (L) of the cabinet rail 9. At least one embossment 13 or several embossments 13 can be arranged on the vertical leg of the fastening section 11 and / or on the transverse leg of the fastening section 11.

[0066] Fig. 3b shows the drawer guide 4 according to Fig. 3a in a cross-section with fitted rolling elements 23a, 23b, 23c.

[0067] It is preferably provided that the rolling elements 23a, 23b, 23c are mounted in a common carriage 22, wherein the carriage 22 is mounted so as to be movable between the body rail 9 and the at least one drawer rail 10.

[0068] According to possible embodiments, it can be provided that at least one rolling body 23a has a cylindrical shape in the assembled position, is rotatable about a horizontal axis and can be moved along the cover 16 of the drawer rail 10.

[0069] At least one further rolling element 23a is rotatable about a horizontal axis in the assembly position and can be moved along the cover 17 of the body rail 9.

[0070] At least one further rolling element 23c is rotatable about a vertical axis in the assembled position and is movable along a section of the body rail 9 with a double wall thickness (2X).

[0071] The carriage 22 with the rolling elements 23a, 23b, 23c (which can alternatively or additionally also be designed as sliding elements) are arranged on the drawer pull-out guide 4, wherein the embossments 13 are arranged on the carcass rail 9 and the drawer rail 10 in such a way that the embossments 13 can be passed through the carriage 22 and the rolling elements 23a, 23b, 23c in the longitudinal direction L without contact.

[0072] Fig. 4a, 4b show the body rail 9 of the drawer pull-out guide 4 in a perspective view from a first viewing angle and in a cross-sectional view.

[0073] Fig. 4a shows the profile 9a of the cabinet rail 9 in a perspective view. The fastening section 11 for fastening the cabinet rail 9 has a fastening side 19 for engagement with the furniture carcass 2. At least one opening 12 is arranged on the fastening section 11 for the passage of a fastening means 28, in particular a screw 28a, through which the cabinet rail 9 is to be fastened to the furniture carcass 2.

[0074] The at least one opening 12 is surrounded on a second side 20, spaced apart from the fastening side 19 by a material thickness (X), by a bead 21, which projects transversely from the second side 20 of the fastening section 11. The screw head of a screw 28a for fastening the fastening section 11 to the furniture body 2 is, in an assembled state, at least partially, preferably substantially completely, received within the annular bead 21.

[0075] The adjacent sheet metal sections 24a, 24b of the cover 16, 17 are connected to each other by at least one common punch 25, 26. In this way, the cover 16, 17 can be further stabilized.

[0076] According to one embodiment, two punches 25, 26 spaced apart from each other in the longitudinal direction (L) are provided.

[0077] According to preferred embodiments, it can be provided that the at least one punching 25, 26 is arranged at one end of the profile 9a of the carcass rail 9 and / or the profile 10a of the at least one drawer rail 10, and / or at least two common punchings 25, 26 are provided, preferably wherein the at least two punchings 25, 26 are mirror-inverted to one another, and / or at least one carriage 22 ( Fig. 3b ) is provided and the at least one punching 25, 26 forms a stop for limiting a travel path of the at least one carriage 22, and / or the at least one punching 25, 26 is designed as an angled tab.

[0078] The at least one punch 25, 26 can thus perform a dual function. On the one hand, the punch 25, 26 serves to stabilize the adjacent sheet metal sections 24a, 24b of the cover 16, 17. On the other hand, the laterally projecting punch 25, 26 is provided to limit the travel path of the carriage 22 in the longitudinal direction (L). The punch 25, 26 provides the carriage 11 with a defined end position and thus cannot extend beyond one end of the cabinet rail 9 and / or the at least one drawer rail 10.

[0079] Fig. 4b shows the drawer guide 4 according to Fig. 4a in a cross-section. On the fastening side 19 of the fastening section 11 and adjacent to the at least one opening 12, at least one recess 27 is arranged for the partial reception of accumulating chip material. In this way, an undesired lifting of the fastening section 11 from the furniture part 2 can be prevented when screwing on the fastening section 11.

[0080] Fig. 5a, 5b, 5c show the body rail 9 of the drawer pull-out guide 4 in a perspective view from a second angle, in a side view from the front and in a side view from the rear.

[0081] Fig. 5a shows the carcass rail 9 with two groups of three embossments 13 each, which are spatially spaced from one another in an edge region of the carcass rail 9. The carcass rail 9 has, in a cross-section normal to the longitudinal direction L, a profile 9a formed from a flat sheet with two parallel longitudinal edges 15a, 15b, wherein each group has three embossments 13 arranged on two orthogonally oriented and adjacent side surfaces 31, wherein the embossments 13 point alternately in the direction of an inner region 32 and in the direction of an outer region 33 of the carcass rail 9. The embossments 13 of the groups border one another in the longitudinal direction L.

[0082] The outermost embossments 13 in the group each extend between one-third and three-quarters of the side surface 31 and end in the transition area of ​​the adjacent side surface 31, with the centrally arranged embossment 13 extending across the entire side surface 31 and ending in the transition area. An extension of embossments 13 beyond the transition area is also conceivable.

[0083] The embossments 13 have a cross-section tapering in the direction of the longitudinal edges 15a, 15b, with three embossment surfaces being oriented towards each other in the manner of a truncated pyramid, since greater stresses generally occur in the region of a transition of the side surfaces 31 than in the region of the longitudinal edges 15a, 15b.

[0084] Fig. 5b und Fig. 5c differ from Fig. 5a merely by changing the viewing angle, whereby the cabinet rail 9 is visible from a rear and a front side. For each group, exactly three embossments 13 are arranged in regions on two orthogonally arranged side surfaces 31 of the cabinet rail 9 to stiffen the profile 9a.

[0085] For each group, two embossments 13 are arranged on the same side surface 31 and end in a transition region of the adjacent side surface 31. The embossments are arranged alternately on the two adjacent side surfaces 31, with the three embossments 13 of the respective group being arranged alternately in a transition region of the two side surfaces 31 relative to the inner region 32 and the outer region 33. The three embossments 13 of the groups point alternately into the inner region 32 and the outer region 33, with two embossments 13 pointing towards the inner region 32 of the carcass rail 10 and one embossment 13 being arranged centrally between the two embossments 13 and pointing towards the outer region 33 of the carcass rail 9 to increase tensile / compressive load capacity.

[0086] In Fig. 5c it can be seen that embossments 13 extend over a step in the profile 9a of the carcass rail 9.

[0087] Fig. 6a, 6b show the drawer rail 10 of the drawer pull-out guide 4 in a perspective view and in a side view from the front.

[0088] Fig. 6a shows a drawer rail 10, which, in a cross-section normal to the longitudinal direction L, has a profile 10a formed from a flat sheet with two parallel longitudinal edges 14a, 14b, and a stamping 13 extending over two orthogonally arranged side surfaces 31 of the profile 10a for stiffening the profile 10a. The side surfaces 31 are arranged in the longitudinal direction L, and the stamping 13 is arranged orthogonally to the longitudinal direction L. The stamping 13 of the drawer rail has three stamping surfaces arranged orthogonally to one another.

[0089] Fig. 6b shows the drawer rail 10 in a side view, wherein the embossed portion 13 extends in an orthogonal direction relative to the longitudinal direction L of the drawer rail 10 over two adjacent side surfaces 31, and a cutout is provided on the drawer rail 10, which faces the inner region 32 and serves as a stop for the carriage 22. The cutout is integrally connected to two adjacent side surfaces 31 of the drawer rail 10, wherein one of these side surfaces 31 has the embossed portion 13 and the other side surface 31 has a fold 16. The embossed portion 13 extends over two side surfaces 31 shortly before a transition region of the associated side surfaces 31. The embossed portion 13 faces toward the outer region 33.

[0090] Fig. 7a, 7b, 7c show a method for producing a profile 9a, 10a of a rail of the drawer pull-out guide 4.

[0091] Fig. 7a shows a drawer rail 10 of the drawer extension guide 4, wherein the drawer rail 10 has a profile 10a formed from a flat sheet metal in a cross-section normal to the longitudinal direction L. One of the two end surfaces 29 of the profile 10a has a taper 30 caused by mechanical breaking off from a semi-finished product, wherein generally both end surfaces 29 can have a taper 30.

[0092] To form the taper 30, two notches 36 were made in the flat sheet metal, which extend over a width of the sheet metal oriented orthogonally to the longitudinal direction L and are arranged on both cover surfaces of the sheet metal. The cross-section of the notch 36 is generally arbitrary and can, for example, be triangular or an elliptical section, as in the schematic detailed sections of a cross-section of a sheet metal. The geometry and depths of a plurality of notches 36 can generally vary, with four notches 36 being particularly preferably used to form a drawer rail 10, a carcass rail 9 or a center rail, each with a taper 30 per end surface 30, by means of non-cutting mechanical cutting.

[0093] In Fig. 7b A sheet metal with two notches 36 with a trapezoidal cross-section is visible, which, after cutting the drawer rail 10 to length, results in two tapers 30 - one taper per drawer rail 10. Generally, however, only one notch 36 can be used on a cover surface of the sheet metal. Advantageously, the notches 36 are introduced before a bending process, although this is not mandatory.

[0094] Fig. 7c illustrates an embossing process for introducing the notches 36 using an embossing die 37 and an embossing roller 38, wherein two embossing rollers or two embossing dies 37 are particularly preferably provided. The material thickness X of the sheet metal is locally reduced, so that the taper 30 manifests itself on the rail to be formed with an angle 34 of 90° and a burr-free end surface 29.

[0095] A tapered cross-section 35 parallel to the longitudinal extension of the sheet has the shape of an isosceles triangle, whereby, depending on the notches 36, other geometries in the tapered cross-section 35 are possible - for example, a right-angled triangle with a one-sided notch 36. The taper 30 can have a manufacturing-related tapered bead and can be concave or convex.

Claims

1. Drawer pull-out guide (4) for movably mounting a drawer (3) on a furniture carcass (2), comprising: - a carcass rail (9) to be fastened to the furniture carcass (2), - at least one drawer rail (10) to be connected to the drawer (3), which drawer rail is mounted displaceable relative to the carcass rail (9) in a longitudinal direction (L), - possibly at least one center rail, which is arranged between the carcass rail (9) and the at least one drawer rail (10), - wherein the drawer pull-out guide (4) has a dead weight and a maximum load-bearing capacity, characterized in that the ratio of the dead weight of the drawer pull-out guide (4) to the maximum load-bearing capacity of the drawer pull-out guide (4) is less than 1 to 50, preferably less than 1 to 57, particularly preferably less than 1 to 65, wherein the at least one drawer rail (10) is displaceable relative to the carcass rail (9) over a pull-out length (n) between a pushed-in end position and a pulled-out end position, the at least one drawer rail (10) has a front end to be connected to a front panel (5) of the drawer (3), and in the pulled-out end position the front end of the at least one drawer rail (10) can drop by a maximum of 4% of the pull-out length (n) in the case of a load which corresponds to the maximum load-bearing capacity, wherein the drawer pull-out guide (4) has at least one property, preferably more than one, selected from the following group of properties i. to v.: i. at least one of the rails (9, 10) has, in a cross section normal to the longitudinal direction (L), at least one profile (9a, 10a) formed from at least one flat metal sheet with two longitudinal edges (14a, 14b, 15a, 15b) running parallel to each other, wherein the profile (9a, 10a) has at least one foldover (16, 17) with at least a double material thickness (2X) on at least one longitudinal edge (14a, 14b, 15a, 15b), preferably on both longitudinal edges (14a, 14b, 15a, 15b), ii. the carcass rail (9) has at least one fastening portion (11) with a fastening side (19) which, during installation of the drawer pull-out guide (4) on the furniture carcass (2), can be attached to the furniture carcass (2) at least in portions, wherein the at least one fastening portion (11) has at least one, preferably circular, opening (12) for a fastening means, preferably a screw, to pass through, wherein the at least one opening (11), on a second side (20) spaced apart from the fastening side (19) by a material thickness (X) of the fastening portion (11), is surrounded by a ridge (21) which protrudes transversely from the second side (20) of the fastening portion (11), iii. at least one of the rails (9, 10) has, in a cross section normal to the longitudinal direction (L), a profile (9a, 10a) formed from at least one flat metal sheet, wherein at least one end surface (29) of the profile (9a, 10a), in particular two, is formed with a taper (30), iv. at least one of the rails (9, 10) has, in a cross section normal to the longitudinal direction (L), at least one profile (9a, 10a) formed from at least one flat metal sheet with two longitudinal edges (14a, 14b, 15a, 15b) running parallel to each other, wherein at least one embossing (13) extending at least in areas over at least two lateral surfaces (31) of the profile (9a, 10a) arranged substantially orthogonal to each other is arranged for reinforcing the profile (9a, 10a), wherein the lateral surfaces (31) are arranged in the longitudinal direction (L) and the at least one embossing (13) is arranged substantially orthogonal to the longitudinal direction (L), v. at least one of the rails (9, 10) has, in a cross section normal to the longitudinal direction (L), at least one profile (9a, 10a) formed from at least one flat metal sheet with two longitudinal edges (14a, 14b, 15a, 15b) running parallel to each other, wherein at least two embossings (13) are provided, which are preferably arranged on at least two lateral surfaces (31) oriented substantially orthogonal to and / or adjoining each other and / or extend over at least two lateral surfaces (31) at least in areas, wherein the at least two embossings (13) face in the direction of an inner area (32) and in the direction of an outer area (33) of the at least one rail (9, 10) in an alternating manner, in particular wherein the at least two embossings (13) adjoin each other in the longitudinal direction (L).

2. Drawer pull-out guide (4) according to claim 1, wherein the drawer pull-out guide (4) - has a length of between 200 mm and 650 mm in a completely pushed-in state, and / or - has a dead weight of between 125 g and 550 g, and / or - has a maximum load-bearing capacity of between 15 kg and 35 kg, and / or - is manufactured at least predominantly from steel.

3. Drawer pull-out guide (4) according to one of claims 1 or 2, wherein at least one rolling body (23a, 23b, 23c) is arranged between the carcass rail (9) and the at least one drawer rail (10), preferably wherein - the at least one rolling body (23a, 23b, 23c) is mounted rotatable about an axis of rotation, particularly preferably wherein the axis of rotation is aligned transverse to the longitudinal direction (L), and / or - at least one carriage (22) is provided, in which the at least one rolling body (23a, 23b, 23c) is arranged, and / or - the at least one rolling body (23a, 23b, 23c) is formed substantially cylindrical, and / or - the at least one rolling body (23a, 23b, 23c) consists at least predominantly of plastic.

4. Drawer pull-out guide (4) according to one of claims 1 to 3, wherein the drawer pull-out guide (4) is formed at least in portions from a flat metal sheet, which has a material thickness (X) of between 0.5 mm and 1.0 mm, preferably a material thickness (X) of 0.7 mm.

5. Drawer pull-out guide (4) according to one of claims 1 to 4, wherein the drawer pull-out guide (4) has at least property i., and wherein the at least one foldover (16, 17) - is arranged on at least one longitudinal edge (14a, 14b, 15a, 15b) of the carcass rail (9), wherein the foldover (16, 17) can be attached during fastening of the carcass rail (9) to the furniture carcass (2), and / or - has at least two metal sheet portions (24a, 24b) resting against each other at least in areas on the at least one longitudinal edge (14a, 14b, 15a, 15b), preferably wherein the at least two metal sheet portions (24a, 24b) have at least one common punching (25, 26), and / or - has at least one crack (18) running in the longitudinal direction (L) on the at least one longitudinal edge (14a, 14b, 15a, 15b) in a cross section normal to the longitudinal direction (L), preferably wherein the at least one foldover (16, 17) is formed on at least one longitudinal edge (15a, 15b) of the carcass rail (9).

6. Drawer pull-out guide (4) according to one of claims 1 to 5, wherein the drawer pull-out guide (4) has at least property i., and wherein the drawer pull-out guide (4) has at least one rolling body (23a, 23b, 23c), which is mobile at least in portions in the longitudinal direction (L) along the at least one foldover (16, 17).

7. Drawer pull-out guide (4) according to one of claims 1 to 6, wherein the drawer pull-out guide (4) has at least property i., and wherein the at least one drawer rail (9) has at least one foldover (16, 17) with at least a double material thickness (2X) on both longitudinal edges (14a, 14b), wherein the two foldovers (16, 17) are aligned transverse, preferably substantially at right angles, to each other and / or wherein one of the two foldovers (16, 17) is turned inwards and the other of the two foldovers (16, 17) is turned outwards.

8. Drawer pull-out guide (4) according to one of claims 1 to 7, wherein the drawer pull-out guide (4) has at least property ii., and wherein the ridge (21) - is formed substantially toroidal in a cross section, and / or - is formed in one piece together with the at least one fastening portion (11), and / or - is produced in the at least one fastening portion (11) by embossing.

9. Drawer pull-out guide (4) according to one of claims 1 to 8, wherein the drawer pull-out guide (4) has at least property iii., and wherein the taper (30) - includes an angle (34) in the range between 60° and 140°, preferably between 75° and 105°, particularly preferably of substantially 90°, wherein it is preferably provided that at least one end surface (29), preferably both, is formed substantially burr-free, and / or - has a taper cross section (35), parallel to the longitudinal extent of the metal sheet, substantially in the shape of a, preferably isosceles, triangle, wherein it is preferably provided that the taper cross section (35) is formed convex and / or concave.

10. Drawer pull-out guide (4) according to one of claims 1 to 9, wherein the drawer pull-out guide (4) has at least property iv. and / or v., and wherein at least one carriage (22) with at least one rolling body (23a, 23b, 23c) and / or sliding body is arranged or arrangeable on the drawer pull-out guide (4), wherein the at least one embossing (13) is arranged on the at least one carcass rail (9) and / or the at least one drawer rail (10) in such a way that the at least one embossing (13) is traversable contactlessly in the longitudinal direction (L) by the at least one carriage (22) and / or the at least one rolling body (23a, 23b, 23c) and / or sliding body.

11. Drawer pull-out guide (4) according to one of claims 1 to 10, wherein the drawer pull-out guide (4) has at least property iv. and / or v., and wherein precisely three embossings (13) for reinforcing the profile (9a, 10a) are arranged at least in areas on at least two substantially orthogonally arranged lateral surfaces (31) of the at least one rail (9, 10).

12. Drawer pull-out guide (4) according to one of claims 1 to 11, wherein the drawer pull-out guide (4) has at least property iv. and / or v., and wherein the at least two embossings (13) are arranged on the same lateral surface (31) or on the same lateral surfaces (31) extending over at least two lateral surfaces (31) and / or on the at least two lateral surfaces (31) in an alternating manner, wherein it is preferably provided that the at least two embossings (13) are arranged in a transition area of the at least two lateral surfaces (31) in an alternating manner relative to the inner area (32) and the outer area (33).

13. Drawer pull-out guide (4) according to one of claims 1 to 12, wherein the drawer pull-out guide (4) has at least property iv. and / or v., and wherein at least, preferably in the case of possibly present groups precisely, two embossings (13) face in the direction of the inner area (32) of the at least one rail (9, 10) and one embossing (13) is arranged in the middle between the at least two embossings (13) and faces in the direction of the outer area (33) of the at least one rail (9, 10) to increase a tensile / compressive strength.

14. Drawer pull-out guide (4) according to one of claims 1 to 13, wherein the drawer pull-out guide (4) has at least property iv. and / or v., and wherein the at least one embossing (13) extends in the orthogonal direction relative to the longitudinal direction (L) of the at least one rail (9, 10) over an area of between one third and three quarters of the lateral surface (31) and / or extends over an area of less than one third, preferably one quarter, of a lateral surface (31) adjoining this lateral surface (31).