Telescopic fitting

Abstract

Telescope fitting (1), having a plurality of telescopic rails (2, 3, 4), wherein a first telescopic rail (2) is slidably guided on one longitudinal side of a second telescopic rail (4) and a third telescopic rail (3) is slidably guided on the other longitudinal side of the second telescopic rail (4) via rollers (5', 6; 5; 6') respectively, such that the first and the third telescopic rails (2; 3) can be displaced relative to the second telescopic rail (4) in opposite directions, wherein the first and / or the third telescopic rail (2; 3) has or is predominantly or completely formed of wood or a wood substitute, and wherein the second telescopic rail has or is formed of a wood material, a wood substitute material or a metal material, preferably aluminium.

Description

[0001] The invention relates to a telescopic fitting.

[0002] Fittings are used on tables to extend tabletop sections and increase the usable table surface. Typically, an additional section is inserted or folded into the table, which can be exposed after the tabletop sections are extended and attached to the extended tabletop sections.

[0003] The tabletop components are usually connected to the table base via a telescopic fitting. Telescopic fittings typically consist of steel rails that are mounted on roller bearings for easy movement.

[0004] The disadvantage of conventional fittings is that they are relatively heavy and the extension process is relatively noisy. Furthermore, due to their weight, high demands are placed on the stability of the guides and the rollers used. This also means that the overall width of such a telescopic fitting, i.e., the width perpendicular to the extension direction, is relatively large to ensure the stability of the fitting. Especially when used in wooden tables, additional components must be provided to conceal the fitting from the outside.

[0005] The object of the present invention is therefore to provide a telescopic fitting with which the disadvantages mentioned can be largely avoided.

[0006] This object is achieved by a telescopic fitting having the features of claim 1 and a table having the features of claim 11. Advantageous embodiments can be found in the subclaims.

[0007] The telescopic fitting according to the invention has a plurality of telescopic rails, wherein a first telescopic rail on one longitudinal side of a second telescopic rail and a third telescopic rail on the other longitudinal side of the second telescopic rail are each guided displaceably via rollers. This allows the first and third telescopic rails to be displaced in opposite directions relative to the second telescopic rail. The first and / or third telescopic rails comprise / comprise wood or a wood substitute material. However, the first and / or third telescopic rails can also be formed predominantly or entirely from wood or a wood substitute material. The second telescopic rail comprises or is formed from a wood material, wood substitute material or metal material, preferably aluminum.

[0008] In this way, a sustainable telescopic fitting is created, since a renewable raw material, namely wood, can be used at least in the area of ​​the first and third telescopic rails. Furthermore, the weight of such an arrangement can be significantly reduced compared to the prior art, since steel profiles are no longer required. This weight reduction results in a whole series of other advantages. When used as intended, the telescopic fitting according to the invention can be extended much more easily. Transport costs are also reduced due to the lower weight. The use of wood or a wood substitute also offers further advantages. For example, a guide for rollers can be incorporated into such telescopic rails by milling.Compared to steel profiles, which are usually tubes with a rectangular cross-section, this also allows essential parts of the second telescopic rail to be almost completely enclosed by the other telescopic rails, provided they are designed accordingly. This reduces the overall width of the telescopic fitting. Furthermore, it reduces the likelihood of contaminants entering the fitting. Furthermore, it provides effective finger protection, since the design according to the invention eliminates any gaps between the second telescopic rail and the other telescopic rails, or such gaps can be minimized.

[0009] In addition, the appearance of the telescopic fitting can be varied much more easily if the outer telescopic rails are constructed from wood or wood substitute. While with metal rails, a wood look must be achieved by laminating or gluing appropriate wooden strips to the outer sides of the telescopic rails, the wood look is already present; a more metallic look can be achieved, for example, by simply painting the telescopic rails. Furthermore, the components can be installed much more flexibly, eliminating the need to keep the fittings pre-assembled in stock. This reduces the required storage volume for the corresponding fittings.

[0010] Preferably, the first and third telescopic rails are coupled to one another via a traction mechanism, preferably a traction cable, or via a rack and pinion gear device. In this way, both telescopic rails can be moved synchronously in opposite directions relative to the second telescopic rail. Such a traction mechanism can also be subjected to a preload, so that the individual tabletop parts of a table are always pushed into a preferred position. Advantageously, the preload acts in such a way that the two outer telescopic rails are preloaded towards a retracted position. In general, an advantage can be achieved with the solution according to the invention due to the lower weight, even with the aforementioned preload, since the force required for the preload can also be reduced compared to steel fittings.

[0011] According to an advantageous embodiment, the traction means is guided via deflection elements, preferably deflection rollers, provided on the second telescopic rail. Two deflection elements can each be arranged on the second telescopic rail in an area between an end face of the second telescopic rail and the center of the second telescopic rail. The deflection of the traction means therefore does not occur at the ends of the second telescopic rail, but rather at a distance therefrom. In principle, however, it is also conceivable for the deflection elements to be placed at the respective ends of the second telescopic rail. This also makes it possible to avoid grinding noises that occur when guiding the traction means when adjusting the telescopic fitting. These grinding noises, which in the prior art arise from the traction means grinding over the axes of rotation of the rollers used.This is achieved in the invention in that the deflection elements are arranged in an area of ​​the second telescopic rail which is not overrun by the rollers used when the telescopic fitting is pulled out or pushed together.

[0012] For this purpose, the above-mentioned bearing on rollers is designed in a particularly preferred manner. For this purpose, first rollers are preferably mounted on the first telescopic rail and on the second telescopic rail, respectively, and are guided, preferably in a form-fitting manner, in a corresponding guide on the second telescopic rail. The form-fitting arrangement has the advantage that the guidance is largely free of play. For this purpose, it can be provided that the first rollers have a running surface with a concave cross-section and the corresponding guides have a convex cross-section. The reverse design or a different profile is also possible. In this way, the guide and running surface of the roller are always centered.

[0013] Furthermore, it can be provided that the guides for the first rollers on the second telescopic rail are arranged below or above the deflection elements, preferably below or above the rotation plane of the deflection rollers. This arrangement of the guides ensures that parts of the rollers do not come into contact with the traction mechanism when the telescopic fitting is extended or retracted, thus avoiding disturbing noises.

[0014] A further advantageous embodiment provides that guides are provided on the first telescopic rail and on the second telescopic rail, in which guides second rollers mounted on the second telescopic rail are guided, preferably in a form-fitting manner. Here, too, the same applies as already mentioned above. The second rollers can have a running surface with a convex cross-section and the corresponding guides can have a concave cross-section. Here, too, the profiling of the rollers can be the opposite of that described. Other profilings are also conceivable. This also ensures that play is avoided. Due to the design of the second telescopic rail from metal, it is also possible to make the width of the second rollers smaller than the width of the first rollers.Also, in principle, the first rollers and the second rollers are different rollers from each other, which preferably also differ from each other in terms of their material (in one case a running surface guided in a wooden profile, in the other case a running surface guided on a metal profile).

[0015] To prevent the second rollers from interfering with the traction mechanism during the sliding movement of the telescopic fitting, the deflection elements can be arranged between the second rollers, preferably on the second telescopic rail. The rotation axes of these rollers should, if possible, be located below or above the deflection elements.

[0016] The invention further relates to a table with a base frame and a first and a second extendable tabletop part, wherein the table has at least one telescopic fitting as described above. It is preferred that, of the at least one telescopic fitting or each telescopic fitting, the first telescopic rail is connected to the first tabletop part, the second telescopic rail is connected to the base frame, and the third telescopic rail is connected to the second tabletop part.

[0017] It is also possible to use the telescopic fitting according to the invention for tables in which a tabletop extension part is not attached in the middle between a first and a second tabletop part, as described above, but rather in front of the tabletop. Accordingly, the present invention also relates to a table with a base frame and a first tabletop part and a tabletop extension part, wherein the table has at least one telescopic fitting described above. It can be provided that of the at least one telescopic fitting or each telescopic fitting, the first telescopic rail is connected to the first tabletop part and the third telescopic rail is connected to the tabletop extension part.

[0018] The invention is described below with reference to the Fig. 1 to 10 are explained in more detail. Fig. 1 shows a perspective view of a telescopic fitting according to the invention in the extended position. Fig. 2 shows a top view of the Fig. 1 shown telescopic fitting. Fig. 3 shows an enlarged detail of the Fig. 2 shown top view with interruptions. Fig. 4 shows a plan view of a Fig. 1 shown telescopic fitting in the retracted position. Fig. Figure 5 shows a cross-sectional view along the line AA of Fig. 4. Fig. 6 shows a cross-sectional view along the line BB of Fig. 4. Fig. Figure 7 shows a cross-sectional view along line CC of Fig. 4. Fig. Figure 8 shows a longitudinal section view along the line DD of Fig. 4. Fig. Figure 9 shows a longitudinal section view along the line EE of Fig. 4. Fig. 10 shows a longitudinal section view along the line FF of Fig. 4.

[0019] The Fig. The telescopic fitting 1 according to the invention shown in Figure 1 has three telescopic rails 2, 3, 4, of which the second telescopic rail 4 forms the inner or middle telescopic rail 4, on which the first and third telescopic rails 2, 3 are arranged. The second telescopic rail 4 is preferably made of metal or consists largely of metal, preferably aluminum, while the two outer telescopic rails 2, 3 are preferably formed, predominantly or entirely, from wood or a wood substitute. Since the first and third telescopic rails 2, 3 enclose the second telescopic rail 4 more or less depending on the extension state, the telescopic fitting 1 does not need to be further covered on the piece of furniture on which it is arranged if the wood or wood substitute has been adapted to the material of the furniture.

[0020] The telescopic fitting 1 according to the invention shown here is suitable for an extendable table. Of the two parts of the base table top, one part is arranged on the first telescopic rail 2, the other on the third telescopic rail 3, whereby they preferably meet centrally above the second telescopic rail 4 and thus form the table top. If the table top surface is to be enlarged, the two parts, preferably halves, are pulled apart by means of the telescopic fitting 1, thus creating a space for a shelf, thereby increasing the table surface. In principle, the fitting presented is also suitable for a front-end extension, in which a table top extension part is attached to only one side of a table top.

[0021] Fig. 2 shows the Fig. 1 shows a top view of the telescopic fitting 1. The two outer telescopic rails 2, 3 are guided along the telescopic rail 4. Fig. 3 shows an enlargement of the Fig. 2, whereby interruptions in the X-direction have been made to keep the illustration clear. A detail shown compared to the Fig. 1 and Fig. 2 are the deflection elements 7 arranged on the second telescopic rail 4 between each of the ends 4a, 4b and the center M thereof, which in the preferred embodiment are designed as deflection rollers. Other deflection elements, such as sliding elements made of aluminum or plastic, are also conceivable as deflection elements. It has proven advantageous to arrange the axis of the deflection rollers perpendicular to the direction of displacement X and perpendicular to the axial direction of the rollers 5, 5', 6, 6'. This allows for a compact design, wherein the traction means 8, which is guided around the deflection elements 7, and the rollers 5, 5', 6, 6' do not interfere with each other.

[0022] Fig. Figure 4 shows a further top view of the illustrated embodiment of the telescopic fitting 1 according to the invention, in which the telescopic fitting 1 is in the retracted position. The sections shown are discussed with reference to the following figures.

[0023] Fig. 5 shows the section through the telescopic fitting 1 along the line AA. On the right side of the Fig. 5 shows the first telescopic rail 2. A recess 21 is machined into the left side of the first telescopic rail 2 so that the upper part of the telescopic rail 2 largely covers the space between the first telescopic rail 2 and the second telescopic rail 4, thus preventing unintentional engagement that could lead to injuries. If the first telescopic rail 2 is made of wood or wood substitute, the recess 21 can be created simply by milling. In the lower third of the first telescopic rail 2, within the recess, a bearing for the first roller 6 is machined into the telescopic rail 2. A circumferential groove is machined into the running surface 6a of the first roller 6, in which groove the guide 42a, 42b of the second telescopic rail 4 holds the rollers.The arrangement can in principle also be reversed, so that the first roller is mounted on the second telescopic rail and guided in the telescopic rail 2 and / or the telescopic rail 3. On the left side of the second telescopic rail 4, approximately at the height of the middle of the third telescopic rail 3, a bearing is incorporated into the second telescopic rail 4, to which the second roller 5 is held. The running surface 5a of the roller 5 is convex and engages in a corresponding concave recess 31 in the third telescopic rail 3, which forms the guide 32a, b for the second roller 5 and holds the second roller 5 securely.

[0024] The second roller 5 is arranged on the same telescopic rail 4 as the deflection elements 7 and therefore does not come into conflict with the deflection element 7 when the telescopic rails 3 are moved. This means that the second roller 5 can be designed to be more robust and arranged more securely. The situation is different with the end of the first telescopic rail 2 shown in section AA. Here, the first roller 6 is not arranged on the same telescopic rail as the deflection element 7; when extended, it moves along the guide 42a, b towards the center M of the second telescopic rail 4 and may have to pass through at least one of the deflection elements 7. For this reason, the first roller 6 is offset downwards compared to the second roller 5 and can therefore easily pass through the deflection element 7.Furthermore, the recess 21 of the first telescopic rail 2 is further open upwards to allow the passage of the deflection element 7 and, if necessary, to provide space for the traction means 8. This allows for a relatively silent displacement of the telescopic rails 2, 3, 4 relative to one another.

[0025] Fig. 6 shows section BB, which is slightly more centrally offset than section AA. In comparison with section AA in Fig. 5, the upper part of the recess 21 is identical, while the lower part does not have a recess for a roller 6, but merely recesses so that the first telescopic rail 2 engages between the guides 42a, 42b without touching them. The deflection element 7 is shown in the upper part of the recess, the vertically arranged axis of which is arranged centrally on the second telescopic rail 4. The running surface of the deflection element 7 has a circumferential groove in which the traction means 8 is guided. Symmetrical to the guide 42a, 42b of the first roller 6 (shown in the background), a further guide 41a, 41b is shown on the opposite side of the second telescopic rail 4.

[0026] The Fig. The sectional view CC shown in Figure 7 corresponds to the counterpart of the sectional view AA. When the telescopic rails 2, 3, 4 are pulled apart, the end of the telescopic rail 2 moves away from the center of the second telescopic rail 4, so that this end does not come into conflict with the deflection element 7 and the traction means 8, whereby it is aligned with the end of the third telescopic rail 3 in Fig. 5. The end of the third telescopic rail 3 corresponds to the design of the first telescopic rail 2 in section AA. In the background, in addition, in comparison with the Fig. 5 shows the deflection element 7 with the traction means 8: It projects into the free space above the first roller 6' and is covered on the other side by the second roller 5'.

[0027] Fig. Figure 8 shows section DD, which lies between the second and third telescopic rails 4, 3. For the sake of clarity, only individual sections are shown. Elements of the third telescopic rail 3 are marked with longitudinal stripes, while elements of the second telescopic rail 4 are shown with diagonal hatching. The second rollers 5, which are arranged on the second telescopic rail 4, are guided in the guide 32a, 32b arranged on the third telescopic rail 3, whereby the end of the guide 32a, b shown in the third section (from above) indicates the stop for the extension, which is intended to prevent the telescopic rails 2, 3, 4 from being pulled apart into an unstable state. The fifth section shows the first roller 6', which is arranged on the third telescopic rail 3 and is guided in the guide 41a, 41b of the second telescopic rail 4.

[0028] (In the Z direction) above the guide 41a, the recess 31 is shown as a hollow space in which the traction means 8 is guided. The hollow space is preferably present so that the third telescopic rail 3 can pass the deflection elements 7 without problems.

[0029] The Fig. 9 shown section EE runs almost centrally through the second telescopic rail 4. In the upper and lower part of the Fig. 9 shows two axle holes in each of which the axles of the second rollers 5, 5' are held. Cross-sectional views of the deflection elements 7 are shown in the middle area. The guides 32a, b of the third telescopic rail 3 for the second rollers 5 are shown in dashed lines in the upper area. The guides 41a, 41b of the second telescopic rail 4 for guiding the first rollers 6' of the third telescopic rail 3 are shown in the lower area.

[0030] Fig. 10 shows the sectional view FF, which is arranged in the overlap area of ​​the first and second telescopic rails 2, 4. The Fig. 10 corresponds in principle to the Fig. 8: The longitudinal hatching corresponds to the first telescopic rail 2, the diagonally hatched elements to those of the second telescopic rail 4. The first roller 6 shown in the upper area is arranged on the first telescopic rail 2 and is guided by the guides 42a, 42b of the second telescopic rail 4. In the lower area of ​​the Fig.10 shows two second rollers 5', which are arranged on the second telescopic rail 4 and guided by the guides 22a, b of the first telescopic rail 2. Since the second rollers 5' are arranged on the same telescopic rail 4 as the deflection elements 7, the rollers 5' and the deflection elements 7 cannot come into conflict, so that the second rollers 5' can also be designed robustly here. In the middle area of ​​the sectional view, deflection elements 7 are shown, over which traction means 8 are guided. The traction means 8 are guided above the movement path of the first rollers 6 so that they do not interfere with each other during the sliding movement.

[0031] The telescopic fitting 1 is primarily intended for extending tables. However, it is also conceivable to use the telescopic fitting according to the invention for other applications. List of reference symbols 1 telescopic fitting 2 first telescopic rail 3 third telescopic rail 4 second telescopic rail 4a Front side / end of 4 4b Front side / end of 4 5, 5' second roles 5a, 5a' running surface of 5, 5' 6, 6' first roles 6a, 6a' Running surface of 6, 6' 7 Deflection element 8 traction devices 21 Recess of 2 22a, 22b Lead of 2 for 5' 31 Recess of 3 32a, 32b lead of 3 for 5 41a, 41b Lead of 4 for 6' 42a, 42b lead of 4 for 6 X direction parallel to the displacement direction of 1 Y direction perpendicular to the shift direction of 1 Z direction perpendicular to X and Y M Center of the telescopic fitting 1 in X-direction

Claims

[1] Telescopic fitting (1), comprising a plurality of telescopic rails (2, 3, 4), wherein a first telescopic rail (2) on one longitudinal side of a second telescopic rail (4) and a third telescopic rail (3) on the other longitudinal side of the second telescopic rail (4) are each displaceably guided via rollers (5', 6; 5; 6'), so that the first and the third telescopic rail (2; 3) can be displaced in opposite directions relative to the second telescopic rail (4), wherein the first and / or the third telescopic rail (2; 3) comprises wood or a wood substitute material or is formed predominantly or completely therefrom and wherein the second telescopic rail comprises or is formed from a wood material, wood substitute material or metal material, preferably aluminum. [2] Telescopic fitting (1) according to claim 1, characterized bythat the first and the third telescopic rail (2, 3) are coupled to one another via a traction means (8), preferably a traction cable, or via a rack and pinion gear device. [3] Telescopic fitting (1) according to claim 2, characterized by that the traction means (8) is guided via deflection elements, preferably deflection rollers (7), provided on the second telescopic rail (4). [4] Telescopic fitting (1) according to claim 3, characterized by that two deflection elements (7) are arranged on the second telescopic rail (4) in a region between an end face (4a, 4b) of the second telescopic rail (4) and the center (M) of the second telescopic rail (4). [5] Telescopic fitting (1) according to one of the preceding claims, characterized bythat first rollers (6, 6') are mounted on the first telescopic rail (2) and on the third telescopic rail (3), which are guided, preferably in a form-fitting manner, in a corresponding guide (42a, 42b; 41a, 41b) on the second telescopic rail (4). [6] Telescopic fitting (1) according to claim 5, characterized by that the first rollers (6, 6') have a running surface which is concave in cross-section and the corresponding guides (42a, 42b; 41a, 41b) have a shape which is convex in cross-section. [7] Telescopic fitting (1) according to claim 5 or 6, characterized by that the guides (42a, 42b; 41a, 41b) for the first rollers (6, 6') on the second telescopic rail (4) are arranged below or above the deflection elements (7), preferably below the plane of rotation of the deflection rollers. [8] Telescopic fitting (1) according to one of the preceding claims, characterized bythat guides (22a, 22b; 32a, 32b) are provided on the first telescopic rail (2) and on the third telescopic rail (3), in which guides second rollers (5, 5') mounted on the second telescopic rail (4) are guided, preferably in a form-fitting manner. [9] Telescopic fitting (1) according to claim 8, characterized by that the second rollers (5, 5') have a running surface which is convex in cross-section and the corresponding guides (22a, 22b; 32a, 32b) have a concave shape in cross-section. [10] Telescopic fitting (1) according to claim 8 or 9, characterized by that the deflection elements (7) are arranged between the second rollers (5, 5') on the second telescopic rail (4), preferably with an axis of rotation below or above the deflection elements. [11] Table with a base frame and a first and a second extendable table top part, wherein the table has at least one telescopic fitting (1) according to one of the preceding claims [12] Table according to claim 11, characterized by that of the at least one telescopic fitting (1) or each telescopic fitting (1), the first telescopic rail (2) is connected to the first table top part, the second telescopic rail (4) is connected to the base frame and the third telescopic rail (3) is connected to the second table top part. [13] Table with a base frame and a first table top part and a table top supplementary part, wherein the table has at least one telescopic fitting (1) according to one of the preceding claims. [14] Table according to claim 13, characterized by that of the at least one telescopic fitting (1) or each telescopic fitting (1), the first telescopic rail (2) is connected to the first table top part and the third telescopic rail (3) is connected to the table top supplementary part.

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