Extension guide rail

Abstract

The invention relates to an extension rail (1) for mounting a movable furniture part that can be moved linearly in an extension direction (2), comprising a framework rail (10) which can be fixed to a furniture framework, a drawer rail (50) which can be fixed to the movable furniture part, a linearly movable central rail (30) which is arranged between the framework rail (10) and the drawer rail (50), and a guide rail (30) for guiding the central rail (30) and for guiding the drawer rail (50) transversely to the extension direction (2), first guide means (72) supporting the central rail (30), in particular in the horizontal direction. As the first guide device (72) is indirectly or directly connected to the skeleton rail (10) in a stationary manner, an improved transverse guide and support of the central rail (30) on the skeleton rail (10) is achieved.

Description

Field of the Invention

[0001] The present invention relates to an extension guide rail for mounting a movable furniture part that can linearly move along an extension direction. The extension guide rail includes a skeleton rail that can be fixed to a furniture skeleton, a drawer rail that can be fixed to the movable furniture part, a linearly movable central rail disposed between the skeleton rail and the drawer rail, and a first guiding device that is used to guide the central rail transversely to the extension direction, particularly in the horizontal direction, and support the central rail.

[0002] An extension guide rail of the type mentioned above can be used to mount a movable furniture component (such as a drawer) to a furniture skeleton (such as a cabinet). Thus, the drawer can be fixed to the drawer rail, and the skeleton rail can be fixed to the cabinet. To enable the opening and closing of the drawer, the relative movement between the cabinet and the drawer can be achieved through the extension guide rail. That is to say, the drawer can linearly move along the extension direction so as to allow the drawer to be opened by extending the drawer and closed by retracting the drawer. For this purpose, the drawer rail can be mounted in a linearly movable manner relative to the skeleton rail.

[0003] The linearly movable central rail disposed between the skeleton rail and the drawer rail can contribute to the way the drawer can be pulled out. For example, it may be desirable for the drawer to be fully pulled out so that the entire interior of the drawer becomes accessible.

[0004] The relative movement between the drawer rail and the central rail can be facilitated by suitable means, such as rollers, which can be provided between the central rail and the drawer rail. Thus, these means can guide the drawer rail on the central rail and further transfer the load from the drawer (such as the weight of the drawer and / or the contents of the drawer) to the central rail. For this purpose, the extension guide rail according to the present invention can include at least one load-transferring outer carriage disposed between the drawer rail and the central rail. The outer carriage can linearly move in the extension direction.

[0005] The central rail can move relative to the skeleton rail. To facilitate the movement of the central rail relative to the skeleton rail, suitable means, such as rollers, can be provided between the central rail and the skeleton rail. Thus, these means can guide the central rail on the skeleton rail and further transfer the load from the central rail (such as the load transferred from the drawer rail) to the skeleton rail. For this purpose, the extension guide rail according to the present invention can include at least one load-transferring inner carriage disposed between the skeleton rail and the central rail. The inner carriage can linearly move in the extension direction.

[0006] While the main load to be transferred from the drawer to the cabinet may be a vertical load generated by the weight of the drawer and / or its contents, it may also be desirable to guide and support the central rail on the skeleton rail in the horizontal direction to ensure reliable operation of the telescopic rail. For this purpose, a first guiding device may be provided.

[0007] The telescopic rails may be provided on opposite lateral sides of the drawer relative to the extension direction. The telescopic rails on the opposite sides may be designed in a mirror-inverted manner with respect to each other. Background Art

[0008] A telescopic rail of the type mentioned at the beginning is known from EP 2 538 818 B1. The telescopic rail includes a skeleton rail, a central rail, and a first carriage arranged therebetween. The telescopic rail further includes a drawer rail and a second carriage arranged between the central rail and the drawer rail. In addition, a synchronizing device is provided which acts between the first carriage and the drawer rail. The synchronizing device includes two pinions which are rotatably fixed to each other and rotatably mounted on the central rail. The first pinion meshes with a rack provided at the first carriage, and the second pinion meshes with a rack provided at the drawer rail. The first carriage further includes rollers which are rotatably mounted about a vertical axis for guiding the central rail on the skeleton rail and for supporting the central rail in a horizontal direction transverse to the extension direction.

[0009] The disadvantage of the known telescopic rail is that the spacing of the guiding means (such as rollers) which can provide lateral support for the central rail on the skeleton rail is limited by the length of the carriage on which the guiding means are mounted. In addition, during the extension and retraction of the movable furniture part, the carriage moves relative to the central rail and the skeleton rail. This means that depending on the current state of the extension device (retracted, extended or intermediate state), the ability to transfer lateral loads between the skeleton rail and the central rail is variable and thus cannot be optimal in each state.

[0010] If a push-out mechanism acting between the furniture carcass and the movable furniture part (such as a drawer) is provided in addition to the extension guide rails, particularly high requirements for lateral support and guidance may arise. The push-out mechanism can be used to automatically push out the drawer once an overtravel has been applied to the movable furniture part in the closed state. The overtravel can be caused by the user further pushing the closed drawer in the closing direction. The push-out mechanism can be provided on both lateral sides of the drawer. It is conceivable that the user may not apply the overtravel to the center of the drawer or only to one side. In both cases, it may be necessary for the overtravel applied by the user to be reliably transmitted to the push-out mechanism. For example, the user may not always apply the overtravel to the center of the drawer. If the drawer is not guided rigidly enough in the lateral direction, the eccentric application of the overtravel may cause only one push-out mechanism to be triggered because the necessary travel for triggering the push-out mechanism is not reached on both sides of the drawer. For example, the drawer may become distorted to a certain extent between its extension guide rails. If only one push-out mechanism is provided, the eccentric application of the overtravel may not trigger the push-out event at all. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to provide an extension guide rail having improved lateral guidance and support of the central rail on the carcass rail.

[0012] The solution to this problem lies in that the first guiding means are connected to the carcass rail either indirectly or directly in a stationary manner. In the present application, a fixed connection means that the first guiding means do not change their position relative to the carcass rail during the extension or retraction of the movable furniture part. However, a connection allowing rotation about a stationary axis is considered a stationary connection.

[0013] The first guiding means connected to the carcass rail in a stationary manner offer the following advantages: They can be freely spaced apart according to the requirements for lateral guidance that the extension guide rails need to meet. In particular, they can be spaced apart independently of the size of the inner carriage that may be provided between the carcass rail and the central rail. Furthermore, according to the present invention, during extension or retraction, the first guiding means do not change their position relative to the carcass rail. This can provide optimal guidance and load transfer between the carcass rail and the central rail, regardless of the state of the extension guide rails (retracted, extended or intermediate state).

[0014] In the present application, it may preferably be provided that the frame rail has a fastening section for fastening to a furniture frame, wherein the bottom of the frame rail abuts against the fastening section at an angle (preferably at a right angle), wherein the side section of the frame rail abuts against the bottom at an angle (preferably at a right angle), and the first guiding means is arranged in the region of the outer side of the side section facing away from the fastening section. However, alternatively or additionally, the first guiding means may be arranged in the region of the inner side of the side section.

[0015] By providing a particularly large support length, particularly good lateral guiding and support of the central rail on the frame rail can be achieved. Thus, according to a preferred variant of the invention, it is proposed that the first guiding means is arranged along the extending direction, and the distance between the first guiding means that are furthest apart from each other in the extending direction is at least half, preferably at least two-thirds, more preferably at least three-quarters of the longitudinal extension of the frame rail measured in the extending direction.

[0016] If the first guiding means is designed as a first guiding roller which is rotatably mounted about a rotation axis (which is preferably aligned transversely, in particular vertically, with respect to the extending direction), the first guiding means preferably each have a first guiding roller, and further preferably, the first guiding roller is supported on the frame rail indirectly or directly by a roller pin, reliable lateral support of the central rail relative to the frame rail and easy and smooth movement can be achieved.

[0017] If it is provided that the first guiding means are each at least partly received in a first guiding means receiving part, preferably, the roller pins of the first guiding means are at least partly received in the pin receiving parts of the first guiding means receiving part at their ends, the first guiding means can be supported reliably and space-savingly.

[0018] According to a preferred embodiment of the invention, it may be provided that the central rail has a top wall and two opposite side walls that are angled (preferably perpendicularly angled) with respect to the top wall, wherein the outer side of the first side wall and the inner side of the second side wall face a fastening section of the frame rail, and the inner side of the second side wall contacts at least one first guiding means, in particular during the linear movement of the movable furniture part. In this way, reliable guiding and support of the central rail on the frame rail can always be provided during extension and / or retraction.

[0019] In the present application, it may be particularly advantageous that at least one of the first guiding means rolls on the inner side of the second side wall during the linear movement of the movable furniture part.

[0020] According to a preferred variant of the invention, it can be provided that an attachment element is provided, which is preferably detachably connected to the framework track, and the first guiding means is arranged on the attachment element. Thus, the attachment element can be manufactured separately from the framework track. This enables different types of attachment elements to be designed and manufactured for use with the same type of framework track in different applications. For example, different types of attachment elements can include different numbers and / or spacings of the first guiding means for different guiding and / or load transfer requirements. In addition, for example, if the first guiding means is worn, the attachment element can be replaced without the need to replace the entire extension guide or the framework track.

[0021] In the present application, the attachment element can also be designed in multiple parts, preferably having at least two attachment segments, and at least one first guiding means is preferably arranged on at least one attachment segment. In this way, the same parts can be used for framework tracks of different lengths and / or different required support lengths between the framework track and the central track. For example, as viewed in the extension direction, a longer track may require a longer distance between the outermost first guiding means and thus more than one attachment segment can be provided, while one attachment segment may be sufficient for a shorter track.

[0022] According to an advantageous variant of the invention, it can be provided that a first guiding means receiving portion is provided on the attachment element, in particular on at least one attachment segment.

[0023] The attachment element can be easily and firmly mounted to the framework track if it is provided that: the attachment element is detachably connected to the framework track by means of a latching connection, preferably at least one receiving element is provided on the framework track, which receiving element is particularly hook-shaped and is received in a receiving portion of the attachment element that at least partially corresponds to the receiving element, and further preferably at least one latching projection is provided on the attachment element, which latching projection is received in a positioning receiving portion of the framework track, which positioning receiving portion is designed to at least partially correspond to the latching projection.

[0024] The lateral support and smooth running of the central track on the framework track can be further improved if at least one load-transferring inner carriage is provided between the framework track and the central track, wherein the inner carriage has at least one first lateral guiding means for guiding the central track and for laterally supporting the central track relative to the extension direction, particularly in the horizontal direction, and the first lateral guiding means is preferably designed as a roller that is rotatably mounted about a rotation axis, which rotation axis is preferably aligned transversely to the extension direction, particularly vertically.

[0025] In the present application, it can be further stipulated that the inner side of the first side wall of the central track and / or the inner side of the side section of the skeleton track come into contact with at least one first lateral guiding device of the inner carriage, especially during the linear movement of the movable furniture part. Thus, it can be envisaged that the first lateral guiding device of the inner carriage can be arranged on the side of the side section of the skeleton track opposite to the first guiding device. Thus, the central track can be guided on the skeleton track and supported in two horizontal directions transverse to the extending direction.

[0026] According to a preferred embodiment of the invention, it is proposed that during the linear movement of the movable furniture part, at least a part of the first lateral guiding device rolls on the inner side of the first side wall of the central track and / or on the inner side of the side section of the skeleton track.

[0027] According to an advantageous further development of the invention, a synchronizing device is proposed which is configured to set the position and / or speed relationship between the single, multiple or all tracks and / or carriages of the extending guide rail. The synchronizing device has at least a first running surface, a second running surface and at least one synchronizing wheel which rolls on at least one running surface, and the first running surface is indirectly or directly connected to the skeleton track in a stationary manner, preferably, wherein the first running surface is at least partly arranged in the area of the first guiding device, especially at least partly arranged on the attachment element. Description of the Drawings

[0028] The present invention will be explained in more detail below with reference to the examples of the embodiments shown in the drawings. The drawings show:

[0029] Figure 1 : A schematic exploded view of the extending guide rail 1;

[0030] Figure 2 : According to Figure 1 The enlarged view of detail II;

[0031] Figure 3 : Figure 3 The schematic exploded view of the components shown in;

[0032] Figure 4 : A schematic view of the central track 30 combined with the synchronizing device 60;

[0033] Figure 5 : According to Figure 4 The cross-sectional view at position V;

[0034] Figure 6 : A schematic exploded view of the outer carriage 40;

[0035] Figure 7 : A schematic exploded view of the inner carriage 20;

[0036] Figure 8 : Enlarged view of detail VIII according to Figure 7 ;

[0037] Figure 9 : Cropped schematic view of the attachment element 70;

[0038] Figure 10 : Enlarged view of detail X according to Figure 1 ;

[0039] Figure 11 : Schematic side view of the extension rail 1;

[0040] Figure 12 : Cross-sectional view at position XII according to Figure 11 ; DETAILED DESCRIPTION

[0041] Figure 1 shows a schematic exploded view of the extension rail 1. Accordingly, the extension rail 1 may include a drawer rail 50 and a skeleton rail 10.

[0042] The drawer rail 50 may be fixed to a movable furniture part, in particular a drawer. As Figure 1 shown, for this purpose, a drawer stop 54 may be provided on the drawer rail 50. Additional connection points or fastening structures may be provided for direct or indirect connection to the movable furniture part.

[0043] The skeleton rail 10 may be fixed to a furniture skeleton, for example, fixed to a cabinet. As Figure 1 shown, the skeleton rail 10 may include a fastening section 11 provided with mounting holes 11.1. In this case, the skeleton rail 10 may be fixed to the furniture skeleton with suitable fixing means, for example, with screws passing through the mounting holes 11.1 and engaging with the furniture skeleton.

[0044] The skeleton rail may further include a bottom 12, and the bottom 12 may be adjacent to the fastening section 11 at a right angle. Side sections 13 may be adjacent to the bottom 12 at right angles on its opposite sides. Adjacent to the side sections 13 at right angles, an upper section of the skeleton rail 10 may be provided, and the upper section may be provided with a support surface 14 on its upper side.

[0045] As can be further seen in Figure 1 the extension rail 1 may additionally include a central rail 30 arranged between the skeleton rail 10 and the drawer rail 50.

[0046] To allow linear movement of the movable furniture part in the extension direction 2, for example to allow opening and closing of a drawer, the drawer track 50 can move linearly relative to the skeleton track 10 along the extension direction 2. The central track 30 can also move linearly relative to the skeleton track 10 along the extension direction 2. In addition, the central track 30 and the drawer track 50 can move linearly relative to each other in the extension direction 2.

[0047] Preferably and according to the illustrated embodiment, the linear movement of the central track 30 relative to the skeleton track 10 can be achieved and / or facilitated by an inner carriage 20 arranged between the central track 30 and the skeleton track 10. The inner carriage 20 can transfer loads between the central track 30 and the skeleton track 10, such as loads caused by the weight of the drawer. The inner carriage 20 can move linearly along the extension direction 2 and can move relative to the skeleton track 10 and / or the central track 30.

[0048] Similarly, the linear movement of the drawer track 50 relative to the central track 30 can be achieved and / or facilitated by an outer carriage 40 arranged between the central track 30 and the drawer track 50. The outer carriage 40 can transfer loads between the drawer track 50 and the central track 30, such as loads caused by the weight of the drawer. The outer carriage 40 can move linearly along the extension direction 2 and can move relative to the central track 30 and / or the drawer track 50.

[0049] Figure 1 It is also shown that the extension guide 1 can include a first running surface 61 and a second running surface 65 as well as a first synchronizing wheel 62 and a second synchronizing wheel 63, which can be understood as part of a synchronizing device 60 (see Figure 4 and Figure 5 ). A synchronizing device 60 can be provided for setting the position and / or speed relationship between two or more of the skeleton track 10, the inner carriage 20, the central track 30, the outer carriage 40, and / or the drawer track 50. Preferably, and as shown in the embodiment according to the drawings, the synchronizing device 60 enables a defined speed and position relationship between the skeleton track 10, the central track 30, and the outer carriage 40. In other words, the synchronizing device 60 can be effective between the skeleton track 10 and the outer carriage 40. The synchronizing device 60 will be discussed in further detail below.

[0050] As Figure 1As shown, the first running surface 61 can be provided on the attachment element 70, which can be detachably connected to the skeleton rail 10. In other words, the first running surface 61 of the embodiment shown in the figure is indirectly connected to the skeleton rail 10. However, it is conceivable to provide a first running surface 61 that is directly connected to the skeleton rail 10, for example, integrally provided with the skeleton rail 10. In any case, preferably, the first running surface 61 is connected to the skeleton rail 10 in a stationary manner. That is to say, preferably, during the movement of the movable furniture part, the central rail 30, the inner carriage 20, the outer carriage 40, and / or the drawer rail 50, the first running surface 61 does not move relative to the skeleton rail 10.

[0051] In addition, Figure 1 it is shown that the second running surface 65 can be directly connected to the outer carriage 40. As in the embodiment shown, preferably, the second running surface 65 is integrally designed with the outer carriage 40. However, it is conceivable that the second running surface 65 is indirectly connected to the outer carriage 40, for example, separately provided from and connected to the outer carriage 40, especially similar to the first running surface 61 (which is preferably indirectly connected to the skeleton rail 10).

[0052] The first running surface 61 and the second running surface 65 can preferably both be designed as racks. However, it is also conceivable that the running surfaces 61, 65 are designed in another way, for example, designed to have a smooth surface. In addition, the running surfaces 61, 65 do not need to be designed in the same way. For example, only one of the running surfaces 61, 65 can be designed as a rack.

[0053] As described above, the synchronization device 60 can further include a first synchronization wheel 62 and a second synchronization wheel 63. As can be seen from Figure 1 the figure, the first synchronization wheel 62 and the second synchronization wheel 63 can be rotatably mounted on the central rail 30.

[0054] Preferably, the second synchronization wheel 63 and the first synchronization wheel 62 are arranged on opposite sides of the wall of the central rail 30. In the embodiment shown, the synchronization wheels 62, 63 are arranged on opposite sides of the second side wall 33 of the central rail 30, with the second synchronization wheel 63 on the outer side and the first synchronization wheel 62 on the inner side. As Figure 2 shown in the figure, the first synchronization wheel 62 can partially pass through the synchronization wheel breakthrough portion 32.1 provided in the top wall 32 of the central rail 30.

[0055] Near the breakthrough portion 32.1 of the synchronous pulley, the support plate 36 can also be arranged on the central track 30. As shown in the figure, the support plate 36 can be substantially formed as a small plate. The support plate 36 can be fixed to the top wall 32 in any suitable manner and can protrude partially above the edge formed between the top wall 32 and the second side wall 33. Thus, as Figure 2 shown, the support plate 36 can be partially located above the second synchronous pulley 63.

[0056] The preferred way to mount the synchronous pulleys 62, 63 to the central track 30 may be referable to Figure 3 explained optimally by Figure 3 shown Figure 2 the schematic exploded view of the components shown in

[0057] Correspondingly, the second synchronous pulley 63 can include a head portion 63.1 adjacent to the shaft portion 63.2. The head portion 63.1 can be configured to interact with the second running surface 65 and preferably roll on the second running surface 65. In the present application, the second synchronous pulley 63 can preferably be designed as a pinion, which is configured to mesh with the second running surface 65, and the second running surface 65 is preferably designed as a rack as described above.

[0058] Similarly, the first synchronous pulley 62 can be configured to interact with the first running surface 61 and preferably roll on the first running surface 61. In the present application, the first synchronous pulley 62 can preferably be designed as a pinion, which is configured to mesh with the first running surface 61, and the first running surface 61 is preferably designed as a rack as described above.

[0059] However, if the first running surface 61 and / or the second running surface 65 are designed in a different way, such as having a smooth surface, the first synchronous pulley 62 and / or the second synchronous pulley 63 can be configured accordingly.

[0060] As in the shown embodiment, the diameter of the first synchronous pulley 62 can preferably be about twice the diameter of the second synchronous pulley 63. The diameters of the synchronous pulleys 62, 63 can be the diameters measured in the regions where the synchronous pulleys 62, 63 are configured to interact with the corresponding running surfaces 61, 65. For example, the diameter of the second synchronous pulley 63 can be measured at the head portion 63.1. The diameters of the synchronous pulleys 62, 63 can be the outer diameters. When the synchronous pulleys 62, 63 are designed as pinions, the diameter can be the inner diameter, outer diameter or pitch diameter of the pinion.

[0061] Returning to the second synchronous pulley 63, the shaft portion 63.2 can preferably be configured to be at least partially received in the hub 62.1 of the first synchronous pulley 62. In other words, by at least partially receiving the shaft portion 63.2 of the second synchronous pulley 63 in the hub 62.1 of the first synchronous pulley 62, the synchronous pulleys 62, 63 can be attached to each other.

[0062] More preferably, both the shaft portion 63.2 and the hub 62.1 are provided with at least partially matching profiles so that torque can be transmitted between them at least partially in a form - locked manner. For this purpose, as shown in the figure, preferably, a spline 63.3 can be provided at the shaft portion 63.2, and the spline 63.3 is configured to engage with at least a partially corresponding mating spline 62.2 provided at the hub 62.1. The spline 63.3 and the mating spline 62.2 can be of any suitable type.

[0063] In addition, the central track 30 can include a shaft opening 33.4, and the shaft portion 63.2 can be guided through the shaft opening 33.4. The shaft opening 33.4 can be designed as a hole in the wall of the central track 30, preferably as a hole in the second side wall 33 as shown.

[0064] As can be seen from Figure 3 A synchronizer retainer 64 can be provided to mount the first synchronizer 62 and the second synchronizer 63 to the central track 30. The synchronizer retainer 64 can include a retaining projection 64.3, which, as shown in the figure, can be designed as a tongue. The retaining projection 64.3 can be held at a retaining means 33.3 provided at the second side wall 33 of the central track 30. When the retaining projection 64.3 is designed as a tongue, the retaining means 33.3 can be appropriately shaped as a hook to hold the retaining projection 64.3 to the second side wall 33.

[0065] The synchronizer retainer 64 can also include a retaining lug 64.5, which can be received in a latch hole 33.5 of the central track 30. As can be seen from Figure 3 it, the retaining lug 64.5 can preferably be designed as a hook that engages through the latch hole 33.5. To further firmly fix the position of the synchronizer retainer 64 against the central track 30, additionally or alternatively, a latch projection 64.4 can be provided on the synchronizer retainer 64, which is configured to be received in a latch receptacle 33.6 of the central track 30. Preferably, the latch receptacle 33.6 is provided on the second side wall 33 of the central track 30.

[0066] The synchronous pulley retainer 64 may include a receiving space 64.1, and the first synchronous pulley 62 may be partially received in the receiving space 64.1. Inside the receiving space 64.1, a bearing receiving portion 64.6 may be provided, and a bearing protrusion 63.4 protruding from the shaft portion 63.2 of the second synchronous pulley 63 may be received in the bearing receiving portion 64.6 and rotatably supported therein. In addition, the synchronous pulley retainer 64 may include a bearing portion 64.2, and the bearing portion 64.2 may be configured to support the area of the shaft portion 63.2 that is not inserted into the hub 62.1. As shown in this embodiment, the bearing portion 64.2 may preferably be designed as a hole and may be further preferably positioned opposite to the bearing receiving portion 64.6.

[0067] In this way, the synchronous pulley retainer 64 can be firmly fixed to the central track 30 first by engaging the retaining protrusion 64.3 with the retaining device 33.3 and / or by engaging the retaining lug 64.5 with the latch hole 33.5 and / or by engaging the latch protrusion 64.4 with the latch receiving portion 33.6. It should be noted that the bearing portion 64.2 of the synchronous pulley retainer 64 may at least partially protrude into the shaft opening 33.4, as can be best seen in Figure 5 . This can provide additional support for the synchronous pulley retainer 64 on the central track 30.

[0068] Once the synchronous pulley retainer 64 is fixed to the central track 30, the first synchronous pulley 62 can be partially inserted into the receiving space 64.1. Then, the second synchronous pulley 63 can be guided with its shaft portion 63.2 through the shaft opening 33.4, the bearing portion 64.2, and the hub 62.1 toward the bearing receiving portion 64.6, and the bearing protrusion 63.4 of the second synchronous pulley 63 can be received at the bearing receiving portion 64.6. The synchronous pulleys 62, 63 can be rotatably mounted on the central track 30 in this state.

[0069] Figure 4 A schematic perspective view showing the central track 30 combined with the synchronizing device 60 is shown, and Figure 5 a cross-sectional view taken at position V according to Figure 4 is shown.

[0070] As can be clearly seen from the cross-sectional view taken at Figure 4 , the second synchronous pulley 63 can engage with the second running surface 65 provided on the outer carriage 40, and the first synchronous pulley 62 can engage with the first running surface 61 provided on the attachment element 70. Note that Figure 4 and Figure 5 the backbone track 10 is not shown, and the attachment element 70 can be attached to the backbone track 10. As described above, in an alternative, it can be envisaged that the first running surface 61 can also be directly provided on the backbone track 10.

[0071] As can be seen from Figure 5 As shown therein, the outer carriage 40 may be provided with a groove 49 which may be arranged along the extension direction 2. The groove 49 may partially accommodate the support plate 36. This can ensure that the outer carriage 40 does not lift off the central track 30. When the second running surface 65 is connected to the outer carriage 40 and the second synchronous pulley 63 is connected to the central track 30, the interaction between the support plate 36 and the groove 49 can ensure proper rolling of the second synchronous pulley 63 on the second running surface 65, in particular proper engagement of the synchronous pulley 63 with the second running surface 65.

[0072] Figure 6 Schematic exploded view showing the outer carriage 40. As Figure 6 shown, the outer carriage 40 may be formed by a plurality of segments 40.1, 41, 42 which may be detachably connected to each other. Preferably, the outer carriage 40 may include a first running segment 41, a second running segment 42 and a base segment 40.1.

[0073] The running segments 41, 42 may be provided with third guiding means 46. The third guiding means 46 may preferably be designed as rollers, as in the embodiment shown. The third guiding means 46 may be held within a third guiding means receiving portion 46.1 which may be designed as an opening within the running segments 41, 42. The third guiding means 46 may rotate about an axis (preferably a horizontal axis) perpendicular to the extension direction 2. In this way, the running segments 41, 42 may be guided in the extension direction 2 and supported in the transverse direction (preferably in the vertical direction). In other words, the running segments 41, 42 may be supported by the third guiding means 46 against the top wall 32 of the central track 30 (see Figure 5 ).

[0074] As Figure 6 shown, the running segments 41, 42 may each include more than one third guiding means receiving portion 46.1. However, not all of the third guiding means receiving portions 46.1 need to be equipped with the third guiding means 46. Instead, the number of third guiding means 46 to be provided within the third guiding means receiving portion 46.1 may be selected based on the expected load transmitted by the running segments 41, 42. In this way, the same design of the running segments 41, 42 may be used with different extension rails 1 which may face different load requirements.

[0075] As can be seen from Figure 6As can be further seen, the second running section 42 may include a third lateral guiding device 45.1. The third lateral guiding device 45.1 may be provided on the lateral running section 45 of the second running section 42. Preferably, the third lateral guiding device 45.1 is designed as a roller. The third lateral guiding device 45.1 may be held at the second running section 42 in substantially the same manner as the third guiding device 46. However, the third lateral guiding device 45.1 may guide the second running section 42 in the extending direction 2 and provide support in the lateral direction, preferably in the horizontal direction. In other words, the second running section 42 may be supported by the third lateral guiding device 45.1 against the first side wall 31 of the central track 30 (reference Figure 5 ). Thus, the third lateral guiding device 45.1 may rotate about a vertical axis.

[0076] Although not visible in the figure, preferably, the first running section 41 is also provided with the third lateral guiding device 45.1.

[0077] The running sections 41, 42 may be detachably connected to the base section 40.1 and thus may be detachably connected to each other via the base section 40.1. As Figure 6 shown, the connection may be established by means of a latch projection 40.2 protruding from the body of the running sections 41, 42 and / or the base section 40.1 and a correspondingly designed latch receptacle 41.1 provided on the respective other section 41, 42, 40.1 to be connected. The latch projection 40.2 may be received in the latch receptacle 41.1.

[0078] Preferably, the latch projection 40.2 further includes a latch element 40.3, as Figure 6 shown, the latch element 40.3 may be designed as a latch nose. The latch element 40.3 may at least partially engage or snap behind a corresponding latch stop 41.2 provided at the latch receptacle 41.1.

[0079] In the illustrated embodiment, the first running section 41 is equipped with two latch receptacles 41.1 and the base section 40.1 is equipped with two matching latch projections 40.2. In addition, the second running section 42 is equipped with two latch projections 40.2 and the base section 40.1 is equipped with two matching latch receptacles 41.1. However, different combinations may be conceivable.

[0080] The outer carriage 40 may be configured such that the running sections 41, 42 are located at opposite end regions of the base section 40.1 in the extending direction 2. Preferably, when observed in the extending direction 2, the first extending section 41 may be connected to the base section 40.1 in the first end region and the second extending section 42 may be connected to the base section 40.1 in the second end region.

[0081] The base section 40.1 may include a top portion 40.4 which may be configured to be at least partially disposed above the top wall 32 of the central track 30 (see reference Figure 5 ). As previously discussed, the second running surface 65 may be directly or indirectly connected to the outer carriage 40. In the illustrated embodiment, the second running surface 65 is integrally formed with the base section 40.1 of the outer carriage 40 and is angled away from the top portion 40.4 such that it faces the second synchronous pulley 63, as can be best seen in Figure 4 and Figure 5 .

[0082] In addition, the outer carriage 40 may be equipped with a fourth lateral guiding device 48. As in the presented embodiment, the fourth lateral guiding device 48 may be held on a side guide rail 47 which is angled away from the top portion 40.4. Similar to the third lateral guiding device 45.1 of the second running section 42, the fourth lateral guiding device 48 may preferably be designed as a roller rotatable about a vertical axis. The fourth lateral guiding device 48 may be partially received in a fourth lateral guiding device receiving portion 48.1. The fourth lateral guiding device receiving portion 48.1 may be arranged at the side guide rail 47 of the base section 40.1.

[0083] By means of the fourth lateral guiding device 48, it is possible to guide the base section 40.1 in the extending direction 2 and to support the base section 40.1 in a horizontal direction transverse to the extending direction 2. For example, as in the presented embodiment, the fourth lateral guiding device 48 may roll on the outside of the second side wall 33 (see reference Figure 5 ). In other words, the fourth lateral guiding device 48 and the third lateral guiding device 45.1 may be arranged on opposite sides of the central track 30.

[0084] Preferably, the outer carriage 40 may be configured such that the side guide rails 47 are located at opposite end regions of the base section 40.1 in the extending direction 2. In this way, the side guide rails 47 may not interfere with the engagement of the second synchronous pulley 63 and the second running surface 65.

[0085] As can be further seen from Figure 6 , the second running section 42 may also be equipped with elastically deformable spring attachments 42.1, 42.2. One spring attachment 42.1 may be connected to the lateral extension section 45 of the second extension section 42. This spring attachment 42.1 may be used to cushion the impact between the second running section 42 and the stop 31.2 which is located on the first side wall 31 of the central track 30 (see reference Figure 1 and Figure 4)。In addition, a spring attachment 42.2 can be arranged such that it is located above the top wall 32 of the central track 30. This spring attachment 42.2 can be used to cushion the impact between the second running section 42 and the stop 56, which is located on the side wall 51 of the drawer track 50 (reference Figure 12 ).

[0086] Figure 7 Schematic exploded view showing the inner carriage 20, and Figure 8 provides an enlarged view of Detail VIII according to Figure 7 . As depicted, the inner carriage 20 can be formed by a plurality of segments 21, 24, which can be detachably connected to each other. Preferably, the inner carriage 20 can include two carriage segments 21 and include a link segment 24.

[0087] The carriage segment 21 can be provided with a second guiding device 26. The second guiding device 26 can preferably be designed as a roller, as in the illustrated embodiment. The second guiding device 26 can be held within a roller receiving portion 26.1, which can be designed as an opening within the upper portion 23 and the base portion 22 of the carriage segment 21. The second guiding device 26 can rotate about an axis perpendicular to the extending direction 2 (preferably a horizontal axis). In this way, the carriage segment 21 can be guided in the extending direction 2 and supported in the transverse direction (preferably in the vertical direction). In other words, the carriage segment 21 can be supported by the second guiding device 26 against the support surface 14 of the frame track 10 (reference Figure 12 ).

[0088] As Figure 7 shown, each carriage segment 21 can include more than one roller receiving portion 26.1. However, not all of the roller receiving portions 26.1 need to be equipped with the second guiding device 26. Instead, the number of second guiding devices 26 to be provided within the roller receiving portions 26.1 can be selected based on the expected load to be transmitted by the carriage segment 21. In this way, carriage segments 21 of the same design can be used with different extension guide rails 1 that may face different load requirements.

[0089] As can be further seen from Figure 7 and Figure 8 , the carriage segment 21 can include a first lateral guiding device 28. The first lateral guiding device 28 can be provided on the base portion 22 of the carriage segment 21. Preferably, the first lateral guiding device 28 is designed as a roller that can rotate about a vertical axis. The first lateral guiding device 28 can guide the carriage segment 21 in the extending direction 2 and provide support in the transverse direction, preferably in the horizontal direction. In other words, the carriage segment 21 can be supported by the first lateral guiding device 28 against the side section 13 of the central track 30 (reference Figure 12 ).

[0090] As Figure 8 seen, the base portion 22 and the upper portion 23 of the carriage section 21 can be connected by a wall portion 23.1 on one lateral side of the carriage section 21. In this way, an orbit receiving portion 27 can be formed between the base portion 22 and the upper portion 23. The orbit receiving portion 27 can be used to receive a part of the upper wall of the frame rail 10 (see reference Figure 12 ). The upper wall can include a support surface 14 on its upper side.

[0091] In addition, the carriage section 21 can be equipped with a guiding projection 23.2 that projects from the upper portion 23 in a lateral direction and downward toward the base portion 22. The guiding projection 23.2 can be configured to engage at least partially and / or temporarily with the lateral section 13 of the frame rail 10 to improve the lateral guidance of the carriage section 21, as Figure 12 can be seen.

[0092] The carriage section 21 can be detachably connected to the link section 24, and thus can be detachably connected to each other via the link section 24. As Figure 7 and Figure 8 shown, the connection can be established by a connection element 24.2 and a connection mating element 21.3. In the embodiment according to the drawings, the connection mating element 21.3 is arranged at the carriage section 21, and the connection element 24.2 is arranged at the link section 24. However, different arrangements can be envisioned.

[0093] As best seen in Figure 8 , the connection mating element 21.3 can be provided at the base portion 22 of the carriage section 21.

[0094] The connection mating element 21.3 can include a connection receiving portion 21.4, and a connection insert 24.4 of the connection element 24.2 can be received in the connection receiving portion 21.4. Thus, the connection receiving portion 21.4 can be designed to at least partially correspond to the connection insert 24.4.

[0095] As can be further seen in Figure 8 , adjacent to the connection insert 24.4, the connection element 24.2 can include a connection neck 24.6. The connection neck 24.6 can have a smaller cross-section than the connection element 24.2. In this way, the connection neck 24.6 can be received in a connection recess 21.6 that can be formed in the wall of the connection receiving portion 21.4.

[0096] In addition, one or more connecting protrusions 21.5 may be present within the connecting receiving portion 21.4. The connecting protrusions 21.5 may protrude from the wall of the connecting receiving portion 21.4 towards its interior. Accordingly, the connecting insert 24.4 may include one or more connecting retraction portions 24.5, and the one or more connecting retraction portions 24.5 may be shaped to partially correspond to the connecting protrusions 21.5. During insertion of the connecting insert 24.4 into the connecting receiving portion 21.4, the connecting protrusions 21.5 may snap into the connecting retraction portions 24.5.

[0097] In the above-described manner, the force transmission between the connecting element 24.2 and the connecting mating element 21.3 may be achieved substantially in a form-locking manner. However, it is conceivable that, at least in part, the force transmission may be achieved in a friction-locking manner. In particular, an interference fit may be provided between the connecting element 24.2 and the connecting mating element 21.3 at least to a certain extent. This may be a supplement to the components of the connecting element 24.2 and the connecting mating element 21.3 described above, which may provide form-locking force transmission to a large extent.

[0098] In the illustrated embodiment, the carriage section 21 and the link section 24 are arranged continuously with respect to each other in the extending direction 2. As can be seen from the figure, the first carriage section 21 is followed by the link section 24, and the link section 24 is followed by the second carriage section 21. In this way, the same type of carriage section 21 can be used for tracks of different lengths of the extending guide rail 1. In order to adapt the inner carriage 20 to a longer or shorter track, it may only be necessary to adjust the length of the link section 24.

[0099] As can be further seen from Figure 7 the carriage section 21 may also be equipped with an elastically deformable spring attachment 21.2. The spring attachment 21.2 may be connected to the base portion 22 of the carriage section 21. The spring attachment 21.2 of the carriage section 21 shown on the Figure 7 left side of Figure 1 can be used to mitigate the impact of the carriage section 21 against the first stop portion 14.1 located below the support surface 14 of the frame rail 10 (refer to Figure 7 ). The spring attachment 21.2 of the carriage section 21 shown on the Figure 1 right side of

[0100] can be used to mitigate the impact of the carriage section 21 against the second stop portion 13.3 provided at the side section 13 of the frame rail 10 (refer to Figure 1As shown, the attachment element 70 may include a first attachment section 71 and a second attachment section 75, and the first attachment section 71 and the second attachment section 75 may follow one another in the extension direction 2. Accordingly, the first running surface 61 may be arranged on the two attachment sections 71, 75.

[0101] A preferred way of detachably connecting the attachment element 70 to the framework track 10 may be as follows: As Figure 1 shown, a receiving element 13.1 may be provided on the side section 13 of the framework track 10. The receiving element 13.1 may be of a hook shape. Corresponding to the receiving element 13.1, the attachment element 70 may include a receiving portion 73 (reference Figure 5 ) that can receive the receiving element 13.1. The receiving portion 73 may be accessible from below, such that the attachment element 70 can be connected to the framework track 10 by placing the receiving portion 73 above the receiving element 13.1 and then lowering the attachment element 70. Due to the hook-shaped design of the receiving element 13.1 and the corresponding design of the receiving portion 73, the attachment element 70 can be supported against the framework track 10 at least in the extension direction 2 and in the lateral horizontal direction perpendicular to the extension direction 2.

[0102] In addition, the attachment element 70 may include a latch projection 74 (reference Figure 5 ) that projects towards the side section 13 of the framework track 10. The latch projection 74 may be received in a correspondingly designed positioning receiving portion 13.2 provided on the side section 13. The latch projection 74 may snap into the positioning receiving portion 13.2 during the lowering of the attachment element 70, i.e., simultaneously inserting the receiving element 13.1 into the receiving portion 73.

[0103] As can be seen from Figure 1 , the extension guide 1 may include a first guiding device 72 for guiding the central track 30 and for supporting the central track 30 in the horizontal direction. The first guiding device 72 may be designed as a first guiding roller 72.2 that can rotate about a vertical axis. The first guiding device 72 may be connected to the framework track 10. Preferably, and as shown in the figure, the first guiding device 72 is provided on the attachment element 70.

[0104] For this purpose, the attachment element 70 may include a first guiding device receiving portion 72.1. The first guiding device receiving portion 72.1 may partially accommodate the first guide roller 72.2. Preferably, the first guide roller 72.2 is rotatably mounted by a roller pin 72.3, and the roller pin 72.3 may be rotatably received in a pin receiving portion 72.4, and the pin receiving portion 72.4 may be provided within the first guiding device receiving portion 72.1.

[0105] As Figure 1As shown, the attachment element 70 may include more than one first guide device receiving portion 72.1. In addition, each of the attachment segments 71, 75 may include more than one first guide device receiving portion 72.1. However, not all of the first guide device receiving portions 72.1 need to be equipped with the first guide device 72. Instead, the number of the first guide devices 72 to be disposed within the first guide device receiving portions 72.1 may be selected based on the expected load to be transferred between the frame rail 10 and the central rail 30. In this way, the same design of the attachment element 70 and / or the attachment segments 71, 75 can be used with different extension rails 1 that may face different load requirements.

[0106] As Figure 12 best seen, at least a portion of the first guide device 72 may contact the inner side of the second side wall 33 of the central rail 30. In particular, they may roll on the inner side of the second side wall 33 during the linear movement of the movable furniture part.

[0107] Returning to Figure 1 , it can be seen that the first guide device 72 may be disposed substantially along the entire length of the frame rail 10. In this way, improved lateral guidance of the central rail 30 on the frame rail 10 is achieved. However, it is also conceivable that only at least two-thirds or at least three-quarters of the length of the frame rail 10 is equipped with the first guide device 72, for example designed in consideration of the requirements for guiding the central rail 30.

[0108] Figure 11 shows a schematic side view of the extension rail 1, and Figure 12 shows a cross-sectional view at position XII according to Figure 11 . Perhaps based on Figure 12 best explains the way the load (such as the load caused by the weight of the drawer) is transferred to the furniture frame.

[0109] As described above, the drawer rail 50 may be attached to the movable furniture part. The vertical load may be transferred between the top wall 52 of the drawer rail 50 and the top wall 32 of the central rail 30 through the third guide device 46 of the outer carriage 40. The horizontal load may be transferred between one side wall 51 of the drawer rail 50 and the first side wall 31 of the central rail 30 through the third lateral guide device 45.1 of the outer carriage 40. In addition, the horizontal load may be transferred between the other side wall 51 of the drawer rail 50 and the second side wall 33 of the central rail 30 through the fourth lateral guide device 48 of the outer carriage 40. Additionally, the vertical load that may cause the drawer rail 50 to lift off the central rail 30 may be compensated by the lifting rollers 35 provided on the side walls 31, 33 of the central rail 30, and the lifting rollers 35 may engage with the curved portions 51.1, 53.1 of the side wall 53 adjacent to the drawer rail 50 (referenceFigure 1 )。

[0110] Between the top wall 32 of the central track 30 and the support surface 14 of the skeleton track 10, the vertical load can be transmitted through the second guiding device 26 of the inner carriage 20. In addition, the vertical load can be transmitted between the first bending portion 31.1 and the upper section of the skeleton track 10 by the second guiding device 26 provided on the base 22 of the inner carriage 20, and the first bending portion 31.1 is angularly offset from the first side wall 31 of the central track 30 at the bottom side of the first side wall 31 of the central track 30. The horizontal load can be transmitted between the first side wall 31 of the central track 30 and the side section 13 of the skeleton track 10 through the first lateral guiding device 28 of the inner carriage 20. In addition, the horizontal load can be transmitted between the second side wall 33 of the central track 30 and the side section 13 of the skeleton track 10 through the first guiding device 72 that can be provided on the attachment element 70.

[0111] Hereinafter, based on the extension (opening) and retraction (closing) operations of the movable furniture part, the functions of the presented embodiment of the extension guide rail 1 according to the present invention will be explained.

[0112] When the movable furniture part is in the closed state, the extension guide rail 1 can be in the retracted state. The retracted state can correspond to Figure 11 the state shown in

[0113] In the retracted state, the movement of the inner carriage 20 against the extension direction 2 can be suppressed by the spring attachment 21.2 that rests against the first stop portion 14.1 of the skeleton track 10 in the extension direction 2.

[0114] The movement of the central track 30 against the extension direction 2 can be suppressed by resting the outer carriage 40 against the stop portion 32.2 provided on the central track 30 (refer to Figure 4 ). This can suppress the movement of the outer carriage 40 against the extension direction 2. Therefore, the rotation of the second synchronous wheel 63 in the counterclockwise direction as seen in Figure 1 can be suppressed. Therefore, since the first synchronous wheels 62, 63 can be connected in a rotationally fixed manner, the rotation of the first synchronous wheel 62 in the counterclockwise direction can be suppressed. Based on this, the relative movement between the first synchronous wheel 62 and the first running surface 61 can be suppressed, thereby suppressing the relative movement between the central track 30 and the skeleton track 10.

[0115] The movement of the drawer track 50 against the extension direction 2 can be suppressed by resting the stop portion 56 of the drawer track 50 against the mating stop portion 41.3 located at the first running section 41 (refer to Figure 1 , Figure 4 and Figure 6 ).

[0116] During the opening movement of the drawer, the drawer track 50 can move relative to the central track 30 in the extending direction 2. The outer carriage 40 can move relative to the central track 30 by means of a third guiding device 46, a fourth lateral guiding device 48 and a third lateral guiding device 45.1 that roll between the respective walls of the outer carriage 40 and the central track 30. The outer carriage 40 can move relative to the central track 30 at half the speed of the relative movement between the drawer track 50 and the central track 30.

[0117] The relative movement between the outer carriage 40 and the central track 30 can cause the second synchronous wheel 63 to roll on the second running surface 65. In this way, the second synchronous wheel 63 can rotate by the relative movement between the outer carriage 40 and the central track 30.

[0118] The rotation of the second synchronous wheel 63 can be transmitted to the first synchronous wheel 62, which can be connected to the first synchronous wheel 62 in a rotationally fixed manner. The resulting rotation of the first synchronous wheel 62 can cause the first synchronous wheel 62 to roll on the first running surface 61. That is, the rotation of the first synchronous wheel 62 can cause a relative movement between the central track 30 and the first running surface 61, and thus can cause a relative movement between the central track 30 and the frame track 10.

[0119] The inner carriage 20 can move relative to the frame track 10 by means of a second guiding device 26 and a first lateral guiding device 28 that roll inside between the respective walls of the central track 30 and the frame track 10. The inner carriage 20 can move relative to the frame track 10 at half the speed of the relative movement between the central track 30 and the frame track 10.

[0120] The speed relationship between the moving tracks and / or the carriages can depend on the ratio of the diameter of the first synchronous wheel 62 to the diameter of the second synchronous wheel 63.

[0121] In the illustrated embodiment, the synchronous wheels 62, 63 are mounted on the central track 30, the second running surface 65 is connected to the outer carriage 40, and the inner carriage 20 is disposed between the frame track 10 and the central track 30. If the above-mentioned diameter ratio is selected to be 2, the speed relationship between the frame track 10, the inner carriage 20, the central track 30, the outer carriage 40 and the drawer track 50 can be 0∶1 / 6∶1 / 3∶2 / 3∶1 (the speed of the drawer track 50 is assumed to be 1). If the ratio is selected to be 2.0, as is preferred and as in the embodiment shown in the figure, the relationship can be 0∶1 / 4∶1 / 2∶3 / 4∶1. This can be a preferred relationship because it provides a uniform distribution of the speeds and travel lengths of the tracks and carriages of the extension guide 1 during extension and retraction.

[0122] When the movable furniture part is in the fully open state, the extension guide rail 1 can be in the fully extended state.

[0123] In the extended state, the further movement of the inner carriage 20 in the extension direction 2 can be suppressed by placing the spring attachment 21.2 facing the extension direction 2 on the second stop portion 13.3 of the frame rail 10.

[0124] The further movement of the central rail 30 in the extension direction 2 can be suppressed by placing the outer carriage 40 against the stop portion 31.2 provided on the central rail 30 using its spring attachment 42.1 (reference Figure 4 ). This can suppress the further movement of the outer carriage 40 in the extension direction 2. Therefore, the further rotation of the second synchronous pulley 63 in the clockwise direction as seen in Figure 1 can be suppressed. Therefore, since the first synchronous pulleys 62, 63 can be connected in a rotationally fixed manner, the clockwise rotation of the first synchronous pulley 62 can be suppressed. Therefore, the relative movement between the first synchronous pulley 62 and the first running surface 61 can be suppressed, thereby suppressing the further relative movement between the central rail 30 and the frame rail 10 in the extension direction 2.

[0125] The further movement of the drawer rail 50 in the extension direction 2 can be suppressed by placing the stop portion (not shown in the figure) of the drawer rail 50 located inside the side wall 51 on the spring attachment 42.2 located at the second running section 42 (reference Figure 1 , Figure 4 and Figure 6 ).

[0126] From the open state, the closing of the movable furniture part can guide the extension guide rail 1 back to the above-mentioned retracted state. For the closing process, the same explanations as those given above for the opening process are similarly valid.

Claims

1. An extension guide rail (1) for mounting a movable furniture part that can move linearly along an extension direction (2), the extension guide rail (1) comprising: A skeleton rail (10) that can be fixed to a furniture skeleton; A drawer rail (50) that can be fixed to the movable furniture part; A central rail (30) that can move linearly, which is arranged between the skeleton rail (10) and the drawer rail (50); A first guiding device (72) for guiding the central rail (30) and for supporting the central rail (30) transversely to the extension direction (2), in particular for supporting the central rail (30) in the horizontal direction; Characterized in that: The first guiding device (72) is indirectly or directly connected to the skeleton rail (10) in a stationary manner.

2. The extension guide rail (1) according to claim 1, Characterized in that, The skeleton rail (10) has a fastening section (11) for fastening to the furniture skeleton; The bottom (12) of the skeleton rail (10) abuts the fastening section (11) at an angle, preferably at a right angle; The side section (13) of the skeleton rail (10) abuts the bottom (12) at an angle, preferably at a right angle; and The first guiding device (72) is arranged in a region on the outer side of the side section (13) facing away from the fastening section (11).

3. The extension guide rail (1) according to claim 1 or 2, Characterized in that, The first guiding device (72) is arranged along the extension direction (2), and the distance between the first guiding devices (72) that are farthest apart from each other in the extension direction (2) is at least half of the longitudinal extension of the skeleton rail (10) measured in the extension direction (2), Preferably at least two-thirds, More preferably at least three-quarters.

4. The extension guide rail (1) according to any one of claims 1 to 3, Characterized in that, The first guiding device (72) is designed as a first guide roller (72.2), and the first guide roller (72.2) is rotatably mounted around a rotation axis, and the rotation axis is preferably transversely aligned with respect to the extension direction (2), in particular vertically aligned; The first guiding device (72) preferably all has a first guide roller (72.2); And further preferably, the first guide roller (72.2) is indirectly or directly supported on the skeleton rail (10) by means of a roller pin (72.3).

5. The extension guide rail (1) according to any one of claims 1 to 4, Characterized in that, The first guiding device (72) is all at least partially received in a first guiding device receiving portion (72.1); Preferably, the roller pin (72.3) of the first guiding device (72) is at least partially received in a pin receiving portion (72.4) of the first guiding device receiving portion (72.1) at its end.

6. The extension guide rail (1) according to any one of claims 1 to 5, Characterized in that, The central track (30) has a top wall (32) and two opposite side walls (31, 33), the side walls (31, 33) being angled, preferably perpendicularly angled, with respect to the top wall (32); The outer side of the first side wall (31) and the inner side of the second side wall (33) face the fastening section (11) of the skeleton track (10); and The inner side of the second side wall (33) contacts at least one of the first guiding devices (72), in particular during the linear movement of the movable furniture part.

7. The extension guide rail (1) according to claim 6, characterized in that During the linear movement of the movable furniture part, at least one of the first guiding devices (72) rolls on the inner side of the second side wall (33).

8. The extension guide rail (1) according to any one of claims 1 to 7, characterized in that An attachment element (70) is provided, which is preferably detachably connectable to the skeleton track (10); and The first guiding device (72) is arranged on the attachment element (70); The attachment element (70) is particularly designed in multiple parts, preferably having at least two attachment segments (71, 75); At least one first guiding device (72) is further preferably arranged on at least one of the attachment segments (71, 75).

9. The extension guide rail (1) according to claims 5 and 8, characterized in that The first guiding device receiving portion (72.1) is provided on the attachment element (70), in particular on at least one attachment segment (71, 75).

10. The extension guide rail (1) according to claim 13, characterized in that The attachment element (70) is detachably connectable to the skeleton track (10) by means of a latch connection; Preferably, at least one receiving element (13.1) is provided on the skeleton track (10); The receiving element (13.1) is particularly hook-shaped and is received in the receiving portion (73) of the attachment element (70), the receiving portion (73) at least partially corresponding to the receiving element (13.1); Further preferably, at least one latch projection (74) is provided on the attachment element (70), the latch projection (74) being received in the positioning receiving portion (13.2) of the skeleton track (10); The positioning receiving portion (13.2) is designed to at least partially correspond to the latch projection.

11. The extension guide rail (1) according to any one of claims 1 to 10, characterized in that At least one load-bearing inner carriage (20) is provided, which is arranged between the skeleton track (10) and the central track (30); The inner carriage (20) has at least one first lateral guiding device (28) for guiding the central track (30) and for laterally supporting, in particular horizontally, the central track (30) relative to the extension direction (2). The first lateral guiding device (28) is preferably designed as a roller which is rotatably mounted about a rotation axis which is preferably aligned transversely to the extension direction (2), in particular vertically.

12. The telescopic guide rail (1) according to claim 11, characterized in that the inner side of the first side wall (31) of the central track (30) and / or the inner side of the side section (13) of the frame track (10) are in contact with at least one first lateral guiding device (28) of the inner carriage (20), in particular during the linear movement of the movable furniture part.

13. The telescopic guide rail (1) according to any one of claims 11 or 12, characterized in that during the linear movement of the movable furniture part, at least a part of the first lateral guiding device (28) rolls on the inner side of the first side wall (31) of the central track (30) and / or the inner side of the side section (13) of the frame track (10).

14. The telescopic guide rail (1) according to any one of claims 1 to 13, characterized in that a synchronizing device (60) is provided for setting the position and / or speed relationship between individual, multiple or all of the tracks (10, 30, 50) and / or carriages (20, 40) of the telescopic guide rail (1); the synchronizing device (60) has at least a first running surface (61), a second running surface (65) and at least one synchronizing wheel (62, 63); the at least one synchronizing wheel (62, 63) rolls on at least one of the running surfaces (61, 65), the first running surface (61) is indirectly or directly connected to the frame track (10) in a stationary manner; preferably, the first running surface (61) is at least partially arranged in the region of the first guiding device (72); in particular, at least partially arranged on the attachment element (70).

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