Fastening device for fixing the push element

Abstract

A fastening device for fixing a sliding element on a movable rail (2, 22) of a pull-out guide (20), comprising a web-shaped holding portion (6, 24) and a clamping mechanism with a receptacle (7, 33), the clamping mechanism being provided with at least one self-locking clamping element (10, 30), by means of which the web-shaped holding portion (6, 24) fitted into the receptacle (7, 33) is fixed in a friction-fit manner against being pulled out, wherein the web-shaped holding portion (6, 24) has at least one stamping (6, 25) formed thereon, against which the clamping element (10, 30) abuts. This enables the web-shaped holding portion (6, 24) to be fixed to the receptacle in a stable manner and to be easily removed.

Description

Technical Field

[0001] The present application relates to a fastening device for fixing a pushing element to a movable rail of a pull-out guide, which comprises a web-shaped retaining portion and a clamping mechanism having a receptacle, on which at least one self-locking clamping element is provided, which fixes the web-shaped retaining portion inserted into the receptacle in a frictional manner to prevent it from being pulled out. Background Art

[0002] EP 3 291 705 B1 discloses a device for securing a drawer to a pull-out guide, using a clamping mechanism into which a web-shaped retaining portion is inserted. This clamping mechanism comprises a pivotally mounted clamping lever, which secures the web-shaped retaining portion in a self-locking and frictionally engaging manner to prevent it from being pulled out. This allows the web-shaped retaining portion to be fixed continuously with a high holding force. While this type of fixing has proven successful, very high pulling forces can cause the web-shaped retaining portion to tear from the holder, resulting in a loose connection.

[0003] DE 10 2018 114 712 A1 shows an improved clamping mechanism. In this document, a web-shaped retaining part is pushed into a receptacle in the housing. The web-shaped retaining part is surrounded by two clamping bodies, which are supported on the inclined walls of the housing. The clamping force can thus prevent the web-shaped retaining part from being pulled out. A torn web-shaped retaining part can also cause problems here. If the spherical clamping element penetrates deeply into the material of the web-shaped retaining part, this tearing is prevented, but the problem then arises that the release of the clamping mechanism becomes more difficult, in particular, the lifting of the web-shaped retaining part perpendicular to the insertion direction is prevented by the recess in the web-shaped retaining part. Summary of the Invention

[0004] It is therefore an object of the present invention to provide a fastening device for fixing a push element to a movable rail, which avoids the above-mentioned problems and makes it more difficult for the web-shaped retaining portion to be torn apart.

[0005] This object is achieved by a fastening device having the features of claim 1 .

[0006] The fastening device according to the invention comprises a web-shaped retaining part and a clamping mechanism having a receptacle and at least one self-locking clamping element, into which the web-shaped retaining part can be inserted so as to be subsequently fixed by friction against withdrawal by the clamping element. At least one embossing is formed on the web-shaped retaining part, against which the clamping element can be placed. Due to the embossing, the web-shaped retaining part no longer has a completely smooth design on the surface, but has a certain contour, which can be used in particular to prevent the web-shaped retaining part from being torn apart. In particular, when very high tensile forces act on the web-shaped retaining part and would release the retaining part from the self-locking connection with the at least one clamping element, the embossing makes such tearing more difficult. The at least one embossing has the advantage that the coating on the web-shaped retaining part is retained by the forming process.

[0007] Preferably, at least one of the embossments is formed by a depression. The stamping die can thereby slightly depress the material of the web-shaped retaining portion to form such a depression. The depth of the depression can be between 0.05 mm and 0.4 mm, in particular between 0.1 mm and 0.3 mm. This relatively small depression is sufficient to significantly increase the holding force of the connection to the clamping mechanism.

[0008] Alternatively, the embossing can also be in the form of a protuberance. In particular, the protuberance is beveled in the longitudinal direction. In both embodiments, the embossing forms an interference edge, which further increases the clamping effect.

[0009] The at least one embossment is preferably formed as a groove. The groove may extend in a longitudinal direction substantially perpendicular to the insertion direction of the web-shaped retaining portion. Thus, the edge of the groove forms a small step that, in the event of the web-shaped retaining portion being torn away from the clamping mechanism, constitutes an obstacle and prevents such tearing.

[0010] To ensure particularly stable fixation of the web-shaped retaining portion, it preferably has at least one embossing on opposite sides. The embossings can be arranged in the same area when viewed in the longitudinal direction, so that the web-shaped retaining portion is symmetrical in the longitudinal direction. Alternatively, multiple embossings can be formed successively on at least one side of the web-shaped retaining portion in the direction of insertion of the retaining portion, in particular on opposite sides. In this way, the clamping body can be retained at multiple embossings. For example, the distance between two adjacent embossings can be between 1 mm and 5 mm.

[0011] In one embodiment, the web-shaped retaining portion is integral with the movable rail of the pull-out guide. This eliminates the need for an additional retaining portion attached to the pull-out guide rail. Alternatively, the retaining portion can also be formed from a separate component that is fixed, in particular welded, to the movable rail of the pull-out guide.

[0012] The web-shaped holding portion is preferably made of a steel sheet (eg a coated steel sheet).The thickness of the steel sheet may be between 1 mm and 3 mm and is therefore significantly thicker than the shallow depth of the embossing.

[0013] The at least one clamping element can be designed as a pivotable lever that rests on the web-shaped retaining portion at one or more contact points in a self-locking manner. Alternatively or additionally, the at least one clamping element can also be formed by a rolling element that is movable in the housing and supported on a wall arranged obliquely with respect to the insertion direction. Such a rolling element can be designed as a ball or cylinder and clamps the web-shaped retaining portion.

[0014] The fastening device according to the invention is particularly used for furniture, in which at least one push element is held movably on a furniture carcass by a pull-out guide and is fixed to a movable rail of the pull-out guide by means of such a fastening device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The invention is explained in more detail below by means of two exemplary embodiments with reference to the drawings.

[0016] Figure 1 shows a perspective view of a first embodiment of a fastening device according to the present invention;

[0017] Figure 2A and Figure 2B Partially shown in cross-section Figure 1 Two views of the fastening device;

[0018] Figure 3A and Figure 3B Partially shown in cross-section Figure 1 Two views of the fastening device;

[0019] Figure 4A and Figure 4B Two views showing the movable rail of the pull-out guide in the end region;

[0020] Figure 5 shows a perspective view of a second embodiment of a fastening device according to the invention;

[0021] Figure 6 Shown Figure 5 A view of the fastening device during assembly, and

[0022] Figure 7 Shown Figure 5 View of the fastening device in the assembled position. DETAILED DESCRIPTION

[0023] In this example, a fastening device 1 for securing a push element, particularly a drawer, to a movable rail 2 comprises a mounting portion 3, which can be attached to the push element, for example, to the underside of a drawer. The mounting portion 3 is adjustable to an actuator 4 in a horizontal direction perpendicular to the longitudinal direction of the pull-out guide's movable rail 2, wherein the adjustment mechanism comprises a swivel portion 5. The rail 2 is secured to the actuator 4. Alternatively, this adjustment mechanism can be omitted. In this case, the rail 2 is secured directly to the mounting element.

[0024] Figure 2A and Figure 2B A clamping mechanism for securing the rail 2 to the actuator 4 is shown. The rail 2 has a web-shaped retaining portion 6 integrally formed with the rail 2 via an end portion of a web, for example, a wall portion of the rail 2 that is vertical in the installed position. The web-shaped retaining portion 6 is inserted into a receptacle 7 of the clamping mechanism formed in the housing. The receptacle 7 includes two walls 8 that are designed to flare in the insertion direction of the web-shaped retaining portion 6 and extend obliquely relative to the insertion direction. Within the receptacle 7 is a clamping element 10, such as a ball or cylinder, that is held on a retaining frame 9. One side of the clamping element 10 is supported on one of the walls 8, while the other side is supported on the web-shaped retaining portion 6. The clamping mechanism can be designed as described in DE 10 2018 114 712 A1. In particular, the clamping mechanism can include a spring element that acts on one end of the web-shaped retaining portion 6. However, unlike the clamping mechanism in this document, the web-shaped retaining portion includes an embossing.

[0025] Figure 3A and Figure 3B A rail 2 is shown with a web-shaped retaining portion 6, with an indentation 11 formed on the web-shaped retaining portion 6. The indentation is elongated perpendicularly to the insertion direction and has essentially the shape of a groove. The indentation has a height extension of between 0.05 mm and 0.4 mm, i.e., up to the surface of the web-shaped retaining portion. Figure 3B A cross-section of a clamping element 10 is shown, which is designed as a ball and rests on the web-shaped holding part 6 in the area of ​​the embossing 11. If a very high force is applied to the thrust element, the clamping element 10 begins to tear apart under a certain force, i.e. slides along the surface of the web-shaped holding part 6 or the embossing 11. In order to stop this tearing process, the embossing 11 is provided, which forms a small obstacle at one edge where the clamping element 10 stops. Thus, by means of the embossing 11, this tearing process can be terminated. In addition, the embossing 11 prevents the clamping elements 10 from penetrating into the material of the web-shaped holding part 6, in which they form a hollow that makes it more difficult to tear off the thrust element vertically in an upward direction.

[0026] exist Figure 4A and Figure 4B In FIG, a web-shaped retaining portion 6 is shown on a movable rail 2. It can be seen that in each case, embossments 11 are formed on opposite sides of the web-shaped retaining portion 6, said embossing being produced by pressing and shaping the web-shaped retaining portion 6. This embossing leaves the coating on the web-shaped retaining portion 6 largely intact. Furthermore, the shape and arrangement of the embossings 11 can be freely selected. Preferably, a plurality of such embossings 11 are provided in the insertion direction of the web-shaped retaining portion 6, so that embossings 11 are present for limiting the tearing movement regardless of the positioning of the clamping element 10. The thickness d of the web-shaped retaining portion 6 can be in the range of between 1 mm and 3 mm, so that the embossings 11 change the thickness d of the web-shaped retaining portion 6 by less than 20%, in particular by less than 15%.

[0027] Figure 5 Another embodiment of a fastening device for securing a push element to a pull-out guide 20 is shown. The pull-out guide 20 comprises a fixed rail 21 that can be secured to the furniture body and a movable rail 22. Optionally, one or more center rails may be provided between the fixed rail 21 and the movable rail 22 to extend the pull-out guide. A fastening portion 23 is secured to the movable rail 22, for example by welding, and is formed with a web-shaped retaining portion 24. The web-shaped retaining portion 24 engages a receptacle in a fastening portion 31, which is formed with a clamping mechanism having a lever 30. The clamping mechanism comprises a receptacle into which the web-shaped retaining portion 24 can be inserted and secured by a self-locking clamping element in the form of the lever 30. Such a clamping mechanism is disclosed, for example, in EP 3 291 705 B1, which is hereby incorporated by reference. The lever 30 can be released from the clamped position by a release element 32, which is designed as a pusher and can move the lever 30 from the clamped position to the released position.

[0028] exist Figure 6 In FIG, the web-shaped retaining portion 24 is shown disengaged from the clamping mechanism. It can be seen that an indentation 25 is formed on the web-shaped retaining portion 24. The indentation 25 is formed by a depression extending perpendicularly to the longitudinal direction of the rail 22 and perpendicularly to the insertion direction of the web-shaped retaining portion 24. The indentation 25 is formed as a groove extending over the entire height of the web-shaped retaining portion 24.

[0029] exist Figure 7 middle, Figure 5The fastening device is shown in the assembled position, and it can be seen that one end of the lever 30 engages the surface of the web-shaped holding portion 24. The end engages in the embossing 25, wherein the web-shaped holding portion 24 is held in a clamping manner in the receptacle 33. If a very high pulling force is now applied to the fastening portion 31 in the pulling direction and the lever 30 begins to slide on the web-shaped holding portion 24, the embossing 25 ensures that the tearing is terminated by a stepped edge.

[0030] The embossing 25 may also be optionally provided on opposite sides of the web-shaped holding portion 24. In addition, a plurality of embossings 25 may be arranged one after the other in the insertion direction. In the illustrated embodiment, the embossing 25 is only shown on one side of the web-shaped holding portion 24.

[0031] Reference Signs List

[0032] 1 Fastening device

[0033] 2 tracks

[0034] 3 Installation

[0035] 4 Actuators

[0036] 5 Rotating part

[0037] 6. Keep part

[0038] 7 Seats

[0039] 8 walls

[0040] 9 Cage

[0041] 10 Clamping elements

[0042] 11 Imprint

[0043] 20 Pull out the guide

[0044] 21 tracks

[0045] 22 tracks

[0046] 23 Fastening part

[0047] 24 Keep part

[0048] 25 Imprint

[0049] 30 Leverage

[0050] 31 Fastening part

[0051] 32 Release element

[0052] 33 seats

[0053] d thickness.

Claims

1. A fastening device for fixing a pushing element to a movable track (2, 22) of a pull-out guide (20), comprising a web-shaped holding portion (6, 24) and a clamping mechanism having a receptacle (7, 33), wherein the web-shaped holding portion is formed integrally with the track (2, 22), or the web-shaped holding portion is fixed to the track (2, 22), at least one self-locking clamping element (10, 30) is provided on the clamping mechanism, the at least one clamping element (10) being formed by a rolling element movably arranged in a housing, the self-locking clamping element fixing the web-shaped holding portion (6, 24) inserted in the receptacle (7, 33) in a frictional manner to prevent it from being pulled out, characterized in that At least one embossing (11, 25) is formed on the web-shaped holding portion (6, 24), against which the clamping element (10, 30) rests.

2. The fastening device according to claim 1, characterized in that The at least one embossing (11, 25) is formed by a depression.

3. The fastening device according to claim 2, characterized in that The height of the depression is between 0.05 mm and 0.4 mm.

4. The fastening device according to claim 2, characterized in that The height of the depression is between 0.1 mm and 0.3 mm.

5. Fastening device according to any one of the preceding claims, characterized in that The at least one embossing (11, 25) is formed as a groove.

6. The fastening device according to claim 5, characterized in that The groove extends substantially perpendicularly to the insertion direction of the web-shaped retaining portion (6, 24).

7. The fastening device according to claim 1, characterized in that At least one embossing (11, 25) is formed on opposite sides of the web-shaped holding portion (6, 24).

8. The fastening device according to claim 1, characterized in that A plurality of embossings (11, 25) are formed successively on at least one side of the web-shaped holding portion (6, 24) in the insertion direction of the holding portion (6, 24).

9. The fastening device according to claim 8, characterized in that The distance between adjacent embossings (11, 25) is between 1 mm and 5 mm.

10. The fastening device according to claim 1, wherein: The web-shaped retaining portion (6) is formed integrally with the movable rail (2) of the pull-out guide.

11. The fastening device according to claim 1, characterized in that The web-shaped retaining portion (6, 24) is made of steel plate.

12. The fastening device according to claim 1, characterized in that The rolling elements are designed as balls or cylinders.

13. The fastening device according to any one of claims 1 or 6 to 12, characterized in that The embossings are formed as ridges.

14. A fastening device for fixing a push element to a movable rail (2, 22) of a pull-out guide (20), comprising a web-shaped holding portion (6, 24) and a clamping mechanism having a receptacle (7, 33), wherein the web-shaped holding portion is formed integrally with the rail (2, 22) or is fixed to the rail (2, 22), and at least one self-locking clamping element (10, 30) is provided on the clamping mechanism, which fixes the web-shaped holding portion (6, 24) inserted in the receptacle (7, 33) in a frictional manner to prevent it from being pulled out, wherein The receptacle (7) comprises two walls (8) which are designed to open in the insertion direction of the web-shaped holding portion (6) and extend obliquely to the insertion direction, at least one stamping (11, 25) being formed on the web-shaped holding portion (6, 24), against which the clamping element (10, 30) abuts, and is characterized in that the clamping element (30) is designed as a pivotable lever.

15. A piece of furniture having a furniture carcass and at least one push element which is movably mounted on the furniture carcass via a pull-out guide and is held on the pull-out guide by at least one fastening device according to any of the preceding claims.

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