EP3574802B1 - Wall for an element of a piece of furniture or for a piece of furniture - Google Patents

Description

The invention relates to a wall, e.g. as a front wall, inner front wall, rear wall, side wall or panel, in particular for an extension, such as a drawer or the like, consisting of metal, in particular steel, as an L, U, C or hollow profile at least one edge, the outer radius of which is equal to or smaller than the material thickness of the profile, a bead being embossed on the inner surface of the edge.

A wall of the type mentioned is from the DE 94 02 770 U1 known, in which a plate-shaped drawer element is disclosed, which has a drawer bottom and a drawer rear wall. A rectangular, conical or wedge-shaped bead extends on the underside of the drawer element over its entire width. When the drawer element is bent, a radius is formed on the outside if there is a bead on the inside.

It is generally known to produce a wall, which is used visibly or concealed as a piece of furniture, from aluminum using an extrusion process. Relatively small radii are possible at the edges.

It is also known that in the plumbing and shopfitting industry, molded parts, in particular cassettes and covers with lateral upstands, are produced from sheet metal, which are usually bent. For optical reasons, it is desirable that the outer bending edges are as sharp as possible and the corners are pointed. With the conventional Bending results in outer radii that are at least as large as the sheet metal thickness. The outer radii are usually 1.5 to 2 times the sheet thickness. In order to achieve the desired appearance, the edges are currently being reworked, or the angles are assembled from individual sheets cut with sharp edges. In the DE 20 2014 005 638 U1 sharp-edged and pointed-cornered sheet metal parts are disclosed, the outer radius of the bending edge being smaller than the sheet metal thickness of the starting material. From the WO 2017/106890 A1 a drawer side wall is known, the sheet steel of which is bent accordingly and then welded to a metal carrier profile, so that the side wall has sufficient torsional rigidity. DE 10 2009 004 674 A1 relates to a device for bending a U or L sheet metal profile to form an angular, in particular right-angled, corner. From the AT 402 593 B a drawer frame made of sheet steel with several webs is known. The DE 39 34 419 A1 discloses a metal drawer side panel with a web panel forming the vertical side panel of the drawer. A side wall profile is made from at least two partial profiles folded from sheet metal, one of which includes the upper part of the partition wall and the upper strip-shaped leg section and the other partial profile comprises the lower part of the partition wall and the lower strip-shaped leg holding the drawer base. The partial profiles are placed one on top of the other in a strip-shaped area and connected to one another.

The EP 0 692 208 A1 shows a drawer with metallic drawer frames, the vertical bars of which form the side boundary of the drawer at least in the area of the drawer bottom and which have a horizontal support bar at the bottom, on which a base plate rests, with several tabs being punched out and bent out of the drawer frames are perforated at their free ends and the tabs have a crease between their junction with the support web and the hole, and the tabs are stiffer at the crease than at the junction with the support web.

The DE 20 2014 005 638 U1 discloses a sheet metal part bent with sharp edges and pointed corners, the outer radius of the bending edge being smaller than the sheet metal thickness of the starting material.

The object of the invention is to provide a wall for a piece of furniture that was not produced using an extruded profile, but which nevertheless has small radii, particularly at the edges and corners.

According to the invention, this object is achieved in that the bead runs at a small distance from the edge after bending, in that the distance to the bending center is between 10% and 90% of the material thickness (d).

The use of an L, U, C or hollow profile produced by forming as a front wall, inner front wall, rear wall, side wall or panel, which consists of metal, in particular steel, according to the invention has the significant advantage over extruded profiles that it is thin-walled can be formed and are therefore light, and that their edges and corners have radii equal to or smaller than the wall thickness.

A bead is embossed on the inner surface of the edge. In this way, the edge or corner area is provided with a smaller radius than usual during the subsequent bending.

It is possible that the material will be cold compacted during bending.

According to the invention, the material has greater strength in the bent area. The material is pressed before or during bending at room temperature and leads to additional material compression in the area to be bent.

The bead is laterally offset at a small distance from the diagonal of the edge. In this way, the shaping of the radius can be influenced in a targeted manner. The radius in the direction of one side surface can be made larger than the radius to the other side surface, so that the curvature of the edge changes from one side surface of the wall to the other. The transition from one curvature to the other is advantageously continuous. In other words, the bend is offset to the bead.

The shape of the edge is varied in that the distance is between 10% and 90%, in particular between 25% and 75% of the wall thickness.

The curvature or the radius of the edge is influenced by the depth of the bead, which corresponds to 5% to 90%, in particular 20% to 80%, preferably 30% to 70% of the material thickness. Sharp-edged transitions are achieved through very deep beads.

Another way of shaping the edge is achieved in that the width of the bead corresponds to 2% to 20%, in particular 4% to 10%, preferably 6% to 8% of the material thickness. With wider beads, more material can be re-pressed during forming, ie pressed into a smaller radius of the die because the wall thickness or material thickness is more deformable.

The invention also relates to a piece of furniture or a piece of furniture with a wall according to claim 1.

Such furniture can be manufactured inexpensively and replace the aluminum variants. The design of the furniture or furniture parts according to the invention are the same as those made of aluminum, so that both embodiments can be used in combination. The sizes of the radii of both variants made of steel and aluminum are the same and do not differ.

Further features and advantages result from the following decision, in which reference is made to the drawing.

Figur 1

eine perspektivische Ansicht einer nicht erfindungsgemäßen Frontwand einer Schublade;

Figur 2

einen Querschnitt II - II durch die Frontwand der Schublade gemäß Figur 1;

Figur 3

eine vergrößerte Ansicht eines Ausschnitts III gemäß Figur 2 nach einem nicht zur Erfindung gehörenden ersten Ausführungsbeispiel;

Figur 4

eine vergrößerte Ansicht eines Ausschnitts IV gemäß Figur 2 nach einem nicht erfindungsgemäßen, zweiten Ausführungsbeispiel;

Figur 5

eine vergrößerte Ansicht eines Ausschnitts V gemäß Figur 4 nach dem zweiten Ausführungsbeispiel; und

Figur 6

eine vergrößerte Ansicht ähnlich wie in Figur 5, gemäß einer erfindungsgemäßen Variante des zweiten Ausführungsbeispiels.

Show in the drawing:

figure 1

a perspective view of a front wall of a drawer not according to the invention;

figure 2

according to a cross section II - II through the front wall of the drawer figure 1 ;

figure 3

according to an enlarged view of a detail III figure 2 according to a first embodiment not belonging to the invention;

figure 4

an enlarged view of a section according to IV figure 2 according to a non-inventive, second embodiment;

figure 5

an enlarged view of a section V according to FIG figure 4 according to the second embodiment; and

figure 6

an enlarged view similar to that in figure 5 , According to an inventive variant of the second embodiment.

Extracts, in particular drawers or the like from furniture or pieces of furniture usually have a wall that is formed by a front wall, inner front wall, rear wall, side wall or panel. In the figure 1 For example, a front wall 10 is shown, which is not intended to limit the invention. The front wall 10 is made of sheet steel and has an inside 12, an outside 14, a top 16 and a bottom 18, with the sheet steel being bent over at the edges 20 in such a way that the free legs forming the bottom 18 face each other, so that they can be welded, crimped, beaded, glued, screwed or riveted, for example. The inside 12 and the underside 18 have openings 22 for attaching the front wall 10 or for mounting fittings or other furniture parts.

Out of figure 2 , which is a cross section through the front wall 10 of figure 1 shows, it can be seen that the formed sheet steel forms a hollow profile and the inside 12 and outside 14 and the top 16 and bottom 18 each run parallel to one another. The shape of the formed steel sheet shown is exemplary and other shapes are possible. The invention relates primarily to the design of at least one of the edges 20 or one of the figure 1 shown corners 24.

In the figure 3 Enlarged edge 20, via which the inside 12 is connected to the top 16 or the top 16 to the outside 14, has an outer radius 26 and an inner radius 28, the outer radius 26 being primarily visible to the user. The outer radius 26 represents a design element of the wall and in particular of the piece of furniture or the furniture part. The edge 20 is produced by pressing in a correspondingly small outer radius 26 during bending. The material of the sheet steel is compressed and the desired profile is created in the forming area. The size of the outer radius 26 results from the shape of the die into which the sheet steel is pressed during stamping. The shape of the inner radius 28 is determined by the die. In this way, ie with embossing, smaller radii can be produced than with simple bending. The smaller radii then correspond to the radii, as in the case of aluminum profiles produced by means of an extrusion process.

The figure 4 shows an embodiment of the wall 10 not according to the invention, the edge 20 having been produced by other or additional measures. The wall 10 also consists of a formed sheet steel and also has an inner side 12 and an outer side 14 as well a top 16 and a bottom 18 and forms a hollow profile, only a part of which is shown. The production of the edge 20 and in particular the outer radius 26 is described in the following Figures 5 and 6 explained in more detail. In the figure 5 becomes the section V according to figure 4 shown, with the solid line of the outer radius 26 is shown. An outer radius 30 is shown with a dashed line, as is produced by simply bending the steel sheet. Before the bending process, the inner surface 32 of the steel sheet is provided with a bead 34, via which the thickness D of the steel sheet is reduced. The deeper the bead 34 penetrates into the sheet steel, the smaller the outer radius 26 can be produced in the subsequent forming process. There is also the possibility that the bead 34 will be sawn into the inner surface 32 of the steel sheet, thereby removing material. Material is punched out in the area of a corner 24, thereby creating the possibility of producing a corner 24 with a smaller outer radius 26 during forming. In the figure 5 it can also be seen that the bead 34 is opposite the outer radius 26 and thus runs parallel to the edge 20 . The edge 20 has the same outer radius 26 both in the direction of the outer surface 36 of the upper side 16 and in the direction of the outer surface 38 of the inner side 12. The edge 20 is thus mirror-symmetrical with respect to the diagonal 40.

The figure 6 shows a variant according to the invention of the second embodiment of an edge 20, in which the outer radius 26A in the direction of the outer surface 36 of the upper side 16 is smaller than the outer radius 26B in the direction of the outer surface 38 of the inner side 12. In this variant, the size of the outer radius is 26A about one-fifth the size of the outer radius 26B. In addition, the outer surfaces 36 and 38 smoothly transition into the radii 26A and 26B.

According to the invention, the bead 34 is offset in the direction of the outer radius 26A, i.e. it has a distance A to the bending center or diagonal 40 of the edge 20. This distance A also causes an offset of the bead 34 to the center of the bending area, so that different outer radii 26 arise when the The bending tool is offset with respect to the bead 34, i.e. the bead 34 is not centered in the tool.

Claims (4)

1. Wall, designed as a front wall (10), interior front wall, rear wall, side wall or blind, for a push-out element, e.g. a drawer or the like, consisting of metal, in particular of steel, as a formed L-, U-, C- or hollow section, having at least one edge (20) the outer radius (26) of which is equal to or smaller than the material thickness (D) of the section, wherein a crimp (34) is impressed into the edge (20) on the inner surface (32), characterised in that the crimp (34) extends at a small distance from the edge (20) after bending, the distance from the bending centre being between 10% and 90% of the material thickness (d).
2. Wall according to claim 1, characterised in that the depth of the crimp (34) corresponds to 5% to 90% of the material thickness (D).
3. Wall according to any of the preceding claims, characterised in that the width of the crimp (34) corresponds to 2% to 20% of the material thickness (D).
4. Piece of furniture or element of a piece of furniture having a wall (10) according to any of the preceding claims.

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