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), the extension rail (1) comprises 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, and a linearly movable central rail (30) which is arranged between the framework rail (10) and the drawer rail (50) and which is arranged between the framework rail (10) and the central rail (30). At least one load-transmitting inner carriage (20) therebetween, and at least one load-transmitting outer carriage (40) arranged between the central rail (30) and the drawer rail (50). The extension rail 1 can be easily and cost-effectively adapted to different rail lengths because the inner carriage (20) and / or the outer carriage (40) is formed from a plurality of segments (21, 24, 40.1, 41, 42) connected to each other, preferably detachably connected.

Description

Technical Field

[0001] The present invention relates to an extension guide rail for mounting a movable furniture part that can linearly move in an extending direction. The extension guide rail includes a frame rail that can be fixed to a furniture frame, a drawer rail that can be fixed to the movable furniture part, a linearly movable central rail disposed between the frame rail and the drawer rail, at least one load-transfer inner carriage disposed between the frame rail and the central rail, and at least one load-transfer outer carriage disposed between the central rail and the drawer rail.

[0002] An extension guide rail of the type mentioned above can be used to mount a movable furniture part (such as a drawer) to a furniture frame (such as a cabinet). Thus, the drawer can be fixed to the drawer rail, and the frame 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, the drawer can linearly move in the extending direction to allow the drawer to be opened by extending the drawer and to allow the drawer to be closed by retracting the drawer. For this purpose, the drawer rail can be mounted in a linearly movable manner relative to the frame rail.

[0003] To extend the way the drawer can be pulled out, for example, to enable it to be fully pulled so that the entire interior of the drawer becomes accessible, a linearly movable central rail can be disposed between the frame rail and the drawer rail.

[0004] The relative movement between the drawer rail and the central rail can be facilitated by an outer carriage that can roll between the drawer rail and the central rail. The outer carriage can linearly move in the extending direction. Thus, the outer carriage 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.

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

[0006] To achieve a reproducible and uniform movement of the rails relative to each other, the extension device according to the present invention can include a synchronization device that can enable the definition of the position and / or speed relationship between the single, multiple, or all rails and / or carriages of the extension guide rail.

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

[0008] Extension guides of the type mentioned at the beginning are known from EP 2 538 818 B1. The extension guide includes a carcass track, a central track, and a first carriage arranged between the two. The extension guide further includes a drawer track and a second carriage arranged between the central track and the drawer track. In addition, synchronizing means are provided effective between the first carriage and the drawer track. The synchronizing means include two pinions which are rotatably fixed to each other and rotatably mounted on the central track. The first pinion meshes with a rack provided at the first carriage, and the second pinion meshes with a rack provided at the drawer track. The first carriage further includes rollers rotatably mounted about a vertical axis for laterally guiding the central track on the carcass track.

[0009] The carriages of the known extension guides are formed as one-piece bodies, such that for different track lengths and / or different desired travel lengths of the tracks and / or the carriages, different carriages must be used. Summary of the Invention

[0010] The technical problem to be solved by the present invention is thus: to provide an extension guide which can be easily and cost-effectively adapted to different track lengths.

[0011] The solution to this problem lies in that the inner carriage is formed by a plurality of segments connected to each other (preferably detachably connected), and / or the outer carriage is formed by a plurality of segments connected to each other (preferably detachably connected).

[0012] Extension guides are typically mass-produced, so it may be particularly desirable to minimize the production costs of the extension guides. An effective way to reduce production costs is to design parts such that they can be used in different applications. In the context of extension guides, in order to account for the different lengths of the tracks of extension guides for different purposes (e.g., for larger and smaller drawers), it may thus be desirable to be able to use carriage segments of the same design. In addition, the requirements regarding mechanical robustness may vary between different applications, for example based on the weight of the drawer and / or the weight of the expected contents of the drawer.

[0013] According to the present invention, an appropriate number of segments can be selected to meet the load transfer and guiding requirements of the extension guide. In addition, for example based on the length of the track of the extension guide and / or the desired travel distance of the carriage on the track, an appropriate spacing can be provided between the segments of the carriage.

[0014] If it is stipulated that the inner carriage has at least two carriage segments that are indirectly or directly connected to each other, the total length of the inner carriage can be selected based on the desired stroke and / or length of the track without the need to redesign the carriage segments. For example, for short tracks and / or travel distances, the two carriage segments can be directly connected to each other. For longer tracks and / or travel distances, the two carriage segments can be indirectly connected to each other. For example, a spacer can be provided between the carriage segments, and the carriage segments are indirectly connected to each other through the spacer. It is also conceivable that the extension guide rail is configured to be used with heavy movable furniture parts, such that more than two carriage segments can be directly or indirectly connected to each other to increase the load-bearing capacity.

[0015] If the connection between the carriage segments is established through a connecting element and a connection mating element, a quick and simple connection of the carriage segments can be achieved, which preferably enables form-locking force transmission, friction-locking force transmission, or friction-locking and form-locking force transmission. Preferably, the connection can be established without using tools.

[0016] In the present invention, the connection of the carriage segments can preferably be designed such that the connecting element has a connection insert, the connection mating element has a connection receiving portion, which is designed to at least partially correspond to the connection insert, and the connection insert can be at least partially received in the connection receiving portion. This can particularly provide firmness between the connecting element and the connection mating element.

[0017] If it is stipulated that the connecting element has a connection neck, the cross-section of the connection neck is smaller than that of the connection insert, the connection mating element has a connection recess in the wall of the connection receiving portion, the connection recess is designed to at least partially correspond to the connection neck, and the connection neck can be at least partially received in the connection recess, a space-saving design can be achieved.

[0018] If it is stipulated that the connection mating element has at least one connection protrusion and / or at least one connection recess in the region of the connection receiving portion, the connecting element has at least one connection recess that at least partially corresponds to the connection protrusion of the connection mating element, and / or has at least one connection protrusion that at least partially corresponds to the connection protrusion of the connection mating element, wherein the connection protrusion can be at least partially received in the respective corresponding connection recess, enhanced connection reliability can be achieved. In this way, the workload and time required to establish the connection can be increased without. Particularly, the connection can still be established without using tools. However, the connection protrusion and the connection recess can provide additional connection strength.

[0019] If it is stipulated that the inner carriage has at least one linking section through which the carriage sections are connected to each other, and the carriage sections and the linking section are preferably arranged continuously in the extending direction, the total length of the inner carriage, especially the total length in the extending direction, can be easily adjusted adaptively. The linking section can be designed taking into account the desired length of the carriage section. In particular, compared with the carriage section, the linking section can have a relatively simple design. Therefore, compared with providing carriage sections with different designs and / or sizes, it may be more cost-effective to provide linking sections with different designs and / or sizes for different applications (e.g., the length of the track).

[0020] Preferably, along the extending direction, a linking section can follow the first carriage section, and another carriage section can follow the linking section. However, it can be envisaged that the carriage sections and the linking section overlap to some extent along the extending direction. In this case, it can be stipulated that the centers (e.g., volume center, area center, and / or centroid) of the carriage section and the linking section can follow each other in the extending direction.

[0021] Additionally or alternatively, it can be stipulated that the linking section connects more than two carriage sections to each other. Substantially, any number, combination, and / or arrangement of carriage sections and connecting sections can be provided. For example, it can be envisaged that more than one linking section is provided between two or more carriage sections, i.e., two or more carriage sections are connected by more than one linking section.

[0022] A feature of a variant of the present invention can be that, when observed with respect to the extending direction, at least one carriage section and / or at least one linking section has a connecting element or a connecting mating element at the front end and / or the rear end. The front end can face the extending direction, and the rear end can face away from the extending direction.

[0023] According to a preferred variant of the present invention, it can be stipulated that at least one carriage section is provided with at least one second guiding device, which is preferably designed as a roller. Through the second guiding device, guiding of the carriage section in the direction of the extending direction and support transverse to the extending direction (especially in the vertical direction) can be achieved. In the present application, it can be stipulated that the second guiding device at least partially contacts the supporting surface of the skeleton track. Therefore, the second guiding device can transfer a load caused, for example, by the weight of the drawer and / or its contents to the skeleton track. For example, the inner carriage can transfer the load from the central track to the skeleton track at least partially through the second guiding device. If the second guiding device is designed as a roller, smooth running of the carriage section on the skeleton track and / or the central track can be achieved.

[0024] The support surface may be the upper surface of the upper wall of the skeletal track. It is conceivable that the second guiding means is arranged to contact at least partially with the support surface, and / or the second guiding means is arranged to contact at least partially with the lower surface of the upper wall (which is opposite to the support surface). For example, the carriage section may include an upper part and a base part, and a track receiving portion may be arranged between the upper part and the base part. The upper wall of the skeletal track may be received at least partially in the track receiving portion. In this case, it may be stipulated that one or both of the base part and the upper part are equipped with the second guiding means.

[0025] Additionally or alternatively, the carriage section may be provided with at least one first lateral guiding means, which is preferably designed as a roller and may be further preferably rotatable about a vertical axis. By means of the first lateral guiding means, it is possible to guide the carriage section in the direction of the extension direction and support it laterally (especially in the horizontal direction) with respect to the extension direction. The first lateral guiding means may contact at least partially with the side section of the skeletal track. The first lateral guiding means may provide lateral support and smooth running of the central track on the skeletal track. For this purpose, the first lateral guiding means may contact at least partially with the first side wall of the central track.

[0026] It is conceivable that the first lateral guiding means is arranged on the base part of the carriage section.

[0027] If it is stipulated that the outer carriage has at least two running sections that are indirectly or directly connected to each other, the total length of the outer carriage can be selected based on the desired stroke and / or length of the track without the need to redesign the carriage section. For example, for a short track and / or travel distance, the two first running sections may be directly connected to each other. For a longer track and / or travel distance, the two running sections may be indirectly connected to each other. For example, a spacer may be arranged between the running sections, and the running sections are indirectly connected to each other through the spacer. It is also conceivable that the extension guide rail is configured to be used with heavy movable furniture parts, such that more than two running sections can be directly or indirectly connected to each other to increase the load-bearing capacity.

[0028] It may also be stipulated that the connection enables form-locking force transmission, friction-locking force transmission, or friction and form-locking force transmission. In this way, the running sections can be quickly and easily connected to each other. Preferably, the connection can be established without the use of tools.

[0029] In the present application, a preferred design of the connection of the running segments can enable the establishment of a connection by means of at least one latching projection and at least one latching receptacle that at least partially corresponds to the latching projection. The latching projection is preferably of tongue shape, wherein the latching projection can be at least partially received in the latching receptacle, and wherein at least one running segment has at least one latching projection and / or at least one latching receptacle. In this way, a firm connection can be achieved.

[0030] According to an advantageous variant of the invention, it can be provided that the latching projection has at least one latching element, which is preferably designed as a latching nose, the latching receptacle has at least one latching stop, and the latching connection between the latching projection and the latching receptacle is established at least in part by the latching element engaging at least in part behind the latching stop. The latching stop can be designed as an edge, preferably as a straight edge.

[0031] If it is provided that the outer carriage has at least one base segment by means of which the running segments are connected to each other, and the running segments are preferably arranged in the opposite end regions of the base segment with respect to the extension direction, the total length of the outer carriage, in particular the total length in the extension direction, can be easily adapted.

[0032] Additionally or alternatively, it can be provided that the base segment connects more than two extension segments to each other. In essence, any number, combination and / or arrangement of running segments and base segments can be provided. For example, it can also be envisaged that two or more running segments are connected to each other by more than one base segment.

[0033] A feature of a variant of the invention can be that the base segment has at least one latching projection and / or at least one latching receptacle.

[0034] According to a preferred variant of the invention, it can be provided that at least one running segment has at least one third guiding device, which is preferably designed as a roller and can further preferably rotate about a horizontal axis. By means of the third guiding device, guiding of the running segment in the direction of the extension direction and support transverse to the extension direction (in particular in the vertical direction) can be achieved. In the present application, it can be provided that the third guiding device at least partially contacts the top wall of the central track. Thus, the third guiding device can transfer a load, for example caused by the weight of the drawer and / or its contents, to the central track. For example, the outer carriage can transfer the load from the drawer track to the central track at least in part by means of the third guiding device. If the third guiding device is designed as a roller, smooth running of the running segment on the central track and / or the drawer track can be achieved.

[0035] Additionally or alternatively, the running section may have at least one third lateral guiding device, which is preferably designed as a roller and, more preferably, can rotate about a vertical axis. By means of the third lateral guiding device, improved guiding of the running section in the direction of the extension direction and support transverse to the extension direction (especially in the horizontal direction) can be achieved. The third lateral guiding device may be in contact with at least part of the first side wall of the central track. The third lateral guiding device can enhance the lateral support and smooth running of the drawer track on the central track. For this purpose, the third lateral guiding device may be in contact with at least part of the side wall of the drawer track.

[0036] It is conceivable that the third lateral guiding device is provided on a lateral running section, which may preferably deviate from the running section at a right angle and may preferably be integrally formed with the running section.

[0037] According to an advantageous embodiment of the invention, it is proposed that the base section has at least one fourth lateral guiding device, which is preferably designed as a roller. By means of the fourth lateral guiding device, guiding of the base section in the direction of the extension direction and support transverse to the extension direction (especially in the horizontal direction) are achieved, and the fourth lateral guiding device is in contact with at least part of the second side wall of the central track. Similar to the third lateral guiding device, the fourth lateral guiding device can provide lateral support and smooth running of the drawer track on the central track. For this purpose, the fourth lateral guiding device may be in contact with at least part of the side wall of the drawer track, which may be opposite to the side wall with which the third lateral guiding device may be at least partly in contact.

[0038] It is conceivable that the fourth lateral guiding device is provided on the base section. In particular, the base section may include a top part and a side guide rail, which may be angled, preferably at a right angle, with respect to the top part. Preferably, the side guide rail may be integrally manufactured with the base section. The fourth lateral guiding device may be arranged at the side guide rail. Description of the Drawings

[0039] 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:

[0040] Figure 1 : A schematic exploded view of the extension guide rail 1;

[0041] Figure 2 : According to Figure 1 Detail II enlarged view;

[0042] Figure 3 : Figure 3 The schematic exploded view of the components shown in;

[0043] Figure 4: Schematic diagram of the central track 30 combined with the synchronization device 60;

[0044] Figure 5 : Cross-sectional view at position V according to Figure 4 ;

[0045] Figure 6 : Schematic exploded view of the outer carriage 40;

[0046] Figure 7 : Schematic exploded view of the inner carriage 20;

[0047] Figure 8 : Enlarged view of detail VIII according to Figure 7 ;

[0048] Figure 9 : Cropped schematic diagram of the attachment element 70;

[0049] Figure 10 : Enlarged view of detail X according to Figure 1 ;

[0050] Figure 11 : Schematic side view of the extension rail 1;

[0051] Figure 12 : Cross-sectional view at position XII according to Figure 11 ; Detailed implementation

[0052] 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.

[0053] 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.

[0054] The skeleton rail 10 may be fixed to a furniture skeleton, for example, fixed to a cabinet. As Figure 1 shown, the skeleton rail 110 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.

[0055] 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. The side section 13 may be adjacent to the bottom 12 at a right angle on its opposite sides. Adjacent to the side section 13 at a right angle, 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.

[0056] As can be further seen in Figure 1 it, the extension guide rail 1 may further include a central rail 30 disposed between the skeleton rail 10 and the drawer rail 50.

[0057] To allow the movable furniture part to linearly move in the extension direction 2, for example, to allow the opening and closing of a drawer, the drawer rail 50 may linearly move relative to the skeleton rail 10 along the extension direction 2. The central rail 30 may also linearly move relative to the skeleton rail 10 along the extension direction 2. In addition, the central rail 30 and the drawer rail 50 may linearly move relative to each other in the extension direction 2.

[0058] Preferably and according to the illustrated embodiment, the linear movement of the central rail 30 relative to the skeleton rail 10 may be achieved and / or facilitated by an inner carriage 20 disposed between the central rail 30 and the skeleton rail 10. The inner carriage 20 may transfer loads between the central rail 30 and the skeleton rail 10, such as loads caused by the weight of the drawer. The inner carriage 20 may linearly move along the extension direction 2 and may move relative to the skeleton rail 10 and / or the central rail 30.

[0059] Similarly, the linear movement of the drawer rail 50 relative to the central rail 30 may be achieved and / or facilitated by an outer carriage 40 disposed between the central rail 30 and the drawer rail 50. The outer carriage 40 may transfer loads between the drawer rail 50 and the central rail 30, such as loads caused by the weight of the drawer. The outer carriage 40 may linearly move along the extension direction 2 and may move relative to the central rail 30 and / or the drawer rail 50.

[0060] Figure 1 It is also shown that the extension guide rail 1 may 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 may 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 positional and / or velocity relationship between two or more of the carcass 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 embodiments according to the figures, the synchronizing device 60 enables a defined velocity and positional relationship between the carcass track 10, the central track 30, and the outer carriage 40. In other words, the synchronizing device 60 can be effective between the carcass track 10 and the outer carriage 40. The synchronizing device 60 will be discussed in further detail below.

[0061] As Figure 1 shown, a first running surface 61 can be provided on an attachment element 70 which can be detachably connected to the carcass track 10. In other words, the first running surface 61 of the embodiment shown in the figure is indirectly connected to the carcass track 10. However, it is conceivable to provide a first running surface 61 which is directly connected to the carcass track 10, for example integrally provided with the carcass track 10. In any case, preferably, the first running surface 61 is connected to the carcass track 10 in a stationary manner. That is to say, preferably, during the movement of the movable furniture part, the central track 30, the inner carriage 20, the outer carriage 40, and / or the drawer track 50, the first running surface 61 does not move relative to the carcass track 10.

[0062] In addition, Figure 1 it is shown that a 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 carcass track 10).

[0063] 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.

[0064] As described above, the synchronizing device 60 can also include a first synchronizing wheel 62 and a second synchronizing wheel 63. As can be seen from Figure 1 it, the first synchronizing wheel 62 and the second synchronizing wheel 63 can be rotatably mounted on the central track 30.

[0065] Preferably, the second synchronizing wheel 63 and the first synchronizing wheel 62 are arranged on opposite sides of the wall of the central track 30. In the illustrated embodiment, the synchronizing wheels 62, 63 are arranged on opposite sides of the second side wall 33 of the central track 30, with the second synchronizing wheel 63 on the outer side and the first synchronizing wheel 62 on the inner side. As Figure 2 shown, the first synchronizing wheel 62 may partially pass through a synchronizing wheel breakthrough portion 32.1 provided in the top wall 32 of the central track 30.

[0066] Near the synchronizing wheel breakthrough portion 32.1, a support plate 36 may also be provided on the central track 30. As shown in the figure, the support plate 36 may be substantially shaped like a small plate. The support plate 36 may be fixed to the top wall 32 in any suitable manner and may partially protrude above the edge formed between the top wall 32 and the second side wall 33. Thus, as Figure 2 shown, the support plate 36 may be partially located above the second synchronizing wheel 63.

[0067] The preferred way to mount the synchronizing wheels 62, 63 to the central track 30 may be best explained with reference to Figure 3 the schematic exploded view of the components shown Figure 3 in Figure 2 the figure.

[0068] Correspondingly, the second synchronizing wheel 63 may include a head portion 63.1 adjacent to the shaft portion 63.2. The head portion 63.1 may be configured to interact with the second running surface 65, preferably to roll on the second running surface 65. In the present application, the second synchronizing wheel 63 may 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.

[0069] Similarly, the first synchronizing wheel 62 may be configured to interact with the first running surface 61, preferably to roll on the first running surface 61. In the present application, the first synchronizing wheel 62 may 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.

[0070] 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 synchronizing wheel 62 and / or the second synchronizing wheel 63 may be correspondingly configured respectively.

[0071] In the illustrated embodiment, the diameter of the first synchronizing wheel 62 may preferably be approximately twice the diameter of the second synchronizing wheel 63. The diameters of the synchronizing wheels 62, 63 may be the diameters measured in the regions of the synchronizing wheels 62, 63 configured to interact with the respective running surfaces 61, 65. For example, the diameter of the second synchronizing wheel 63 may be measured at the head portion 63.1. The diameters of the synchronizing wheels 62, 63 may be outer diameters. When the synchronizing wheels 62, 63 are designed as pinions, the diameter may be the inner diameter, outer diameter or pitch diameter of the pinion.

[0072] Returning to the second synchronizing wheel 63, the shaft portion 63.2 may preferably be configured to be received at least partially in the hub 62.1 of the first synchronizing wheel 62. In other words, by receiving the shaft portion 63.2 of the second synchronizing wheel 63 at least partially in the hub 62.1 of the first synchronizing wheel 62, the synchronizing wheels 62, 63 may be attached to each other.

[0073] Further preferably, both the shaft portion 63.2 and the hub 62.1 are provided with at least partially matching profiles such that torque can be transferred between the two at least partially in a form - locked manner. For this purpose, as shown in the figure, preferably, a spline 63.3 may be provided at the shaft portion 63.2, which spline 63.3 is configured to engage at least partially corresponding mating splines 62.2 provided at the hub 62.1. The spline 63.3 and the mating splines 62.2 may be of any suitable type.

[0074] In addition, the central track 30 may include a shaft opening 33.4 through which the shaft portion 63.2 may be guided. The shaft opening 33.4 may 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.

[0075] As can be further seen from Figure 3 a synchronizing wheel retainer 64 may be provided to mount the first synchronizing wheel 62 and the second synchronizing wheel 63 to the central track 30. The synchronizing wheel retainer 64 may include a retaining projection 64.3 which, as shown, may be designed as a tongue. The retaining projection 64.3 may 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 may be appropriately shaped as a hook in order to hold the retaining projection 64.3 to the second side wall 33.

[0076] The synchronizing wheel retainer 64 may further include a retaining lug 64.5 which may be received in a latch hole 33.5 of the central track 30. As can be seen from Figure 3As can be seen, 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 synchronous pulley retainer 64 against the central track 30, additionally or alternatively, a latch projection 64.4 can be provided on the synchronous pulley retainer 64, which is configured to be received in the latch receiving portion 33.6 of the central track 30. Preferably, the latch receiving portion 33.6 is provided on the second side wall 33 of the central track 30.

[0077] The synchronous pulley retainer 64 can include a receiving space 64.1, and the first synchronous pulley 62 can be partially received in the receiving space 64.1. Inside the receiving space 64.1, a bearing receiving portion 64.6 can be provided, and a bearing projection 63.4 protruding from the shaft portion 63.2 of the second synchronous pulley 63 can be received in the bearing receiving portion 64.6 and rotatably supported in the bearing receiving portion 64.6. In addition, the synchronous pulley retainer 64 can include a bearing portion 64.2, and the bearing portion 64.2 can be configured to support the region 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 can preferably be designed as a hole and can be further preferably positioned opposite to the bearing receiving portion 64.6.

[0078] In this way, the synchronous pulley retainer 64 can be firmly fixed to the central track 30 first by engaging the retaining projection 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 projection 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 can 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.

[0079] 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 second synchronous pulley 63 can have its bearing projection 63.4 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.

[0080] Figure 4 A schematic perspective view showing the central track 30 combined with the synchronous device 60, and Figure 5 showing a cross-sectional view at position V according to Figure 4 of.

[0081] From Figure 4As can be clearly seen from the cross-sectional view, the second synchronizing wheel 63 can engage with the second running surface 65 provided on the outer carriage 40, and the first synchronizing wheel 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.

[0082] As can be seen from Figure 5 the outer carriage 40 can be provided with a groove 49, which can be arranged along the extension direction 2. The groove 49 can 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 synchronizing wheel 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 synchronizing wheel 63 on the second running surface 65, in particular proper engagement of the synchronizing wheel 63 with the second running surface 65.

[0083] Figure 6 A schematic exploded view of the outer carriage 40 is shown. As Figure 6 shown, the outer carriage 40 can be formed by a plurality of segments 40.1, 41, 42 that can be detachably connected to each other. Preferably, the outer carriage 40 can include a first running segment 41, a second running segment 42, and a base segment 40.1.

[0084] The running segments 41, 42 can be provided with third guiding means 46. The third guiding means 46 can preferably be designed as rollers, as in the shown embodiment. The third guiding means 46 can be held within a third guiding means receiving portion 46.1, which can be designed as an opening within the running segments 41, 42. The third guiding means 46 can rotate about an axis perpendicular to the extension direction 2 (preferably a horizontal axis). In this way, the running segments 41, 42 can 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 can be supported by the third guiding means 46 against the top wall 32 of the central track 30 (refer to Figure 5 ).

[0085] As Figure 6As shown, the running segments 41, 42 may each include more than one third guide device receiving portion 46.1. However, not all of the third guide device receiving portions 46.1 need to be equipped with a third guide device 46. Instead, the number of third guide devices 46 to be provided within the third guide device receiving portions 46.1 may be selected based on the expected loads transmitted by the running segments 41, 42. In this way, the same design of the running segments 41, 42 can be used with different extension guide rails 1 that may face different load requirements.

[0086] As can be further seen Figure 6 the second running segment 42 may include a third lateral guide device 45.1. The third lateral guide device 45.1 may be provided on the lateral running segment 45 of the second running segment 42. Preferably, the third lateral guide device 45.1 is designed as a roller. The third lateral guide device 45.1 may be held at the second running segment 42 in substantially the same manner as the third guide device 46. However, the third lateral guide device 45.1 may guide the second running segment 42 in the extension direction 2, providing support in the lateral direction, preferably in the horizontal direction. In other words, the second running segment 42 may be supported by the third lateral guide device 45.1 against the first side wall 31 of the central track 30 (reference Figure 5 ). Accordingly, the third lateral guide device 45.1 may rotate about a vertical axis.

[0087] Although not visible in the figure, it is preferred that the first running segment 41 is also provided with a third lateral guide device 45.1.

[0088] The running segments 41, 42 may be detachably connected to the base segment 40.1 and may thus be detachably connected to each other via the base segment 40.1. As Figure 6 shown, the connection may be established by means of a latch projection 40.2 protruding from the bodies of the running segments 41, 42 and / or the base segment 40.1 and a correspondingly designed latch receiving portion 41.1 provided on the respective other segment 41, 42, 40.1 to be connected. The latch projection 40.2 may be received in the latch receiving portion 41.1.

[0089] 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 receiving portion 41.1.

[0090] In the illustrated embodiment, the first running section 41 is provided with two latch receiving portions 41.1, and the base section 40.1 is provided with two mating latch projections 40.2. In addition, the second running section 42 is provided with two latch projections 40.2, and the base section 40.1 is provided with two mating latch receiving portions 41.1. However, different combinations are conceivable.

[0091] 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 extension direction 2. Preferably, when viewed in the extension direction 2, the first extension section 41 may be connected to the base section 40.1 in the first end region, and the second extension section 42 may be connected to the base section 40.1 in the second end region.

[0092] The base section 40.1 may include a top portion 40.4, and the top portion 40.4 may be configured to be at least partially disposed above the top wall 32 of the central track 30 (see 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 synchronizing pulley 63, as best seen in Figure 4 and Figure 5 .

[0093] In addition, the outer carriage 40 may be provided with a fourth lateral guiding device 48. As in the presented embodiment, the fourth lateral guiding device 48 may be held on a lateral guide 47 that 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 lateral guide 47 of the base section 40.1.

[0094] By means of the fourth lateral guiding device 48, it is possible to guide the base section 40.1 in the extension direction 2 and to support the base section 40.1 in a horizontal direction transverse to the extension 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 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.

[0095] Preferably, the outer carriage 40 can be configured such that the side guide rails 47 are located at opposite end regions of the base section 40.1 in the extension direction 2. In this way, the side guide rails 47 can avoid interfering with the engagement of the second synchronizing pulley 63 and the second running surface 65.

[0096] As can be further seen from Figure 6 , the second running section 42 can also be equipped with elastically deformable spring attachments 42.1, 42.2. One spring attachment 42.1 can be connected to the lateral extension section 45 of the second extension section 42. This spring attachment 42.1 can be used to mitigate 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 (refer to Figure 1 and Figure 4 ). Additionally, one 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 mitigate 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 (refer to Figure 12 ).

[0097] Figure 7 A schematic exploded view of the inner carriage 20 is shown, 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 sections 21, 24, which can be detachably connected to each other. Preferably, the inner carriage 20 can include two carriage sections 21 and include a link section 24.

[0098] The carriage section 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 section 21. The second guiding device 26 can rotate about an axis perpendicular to the extension direction 2 (preferably a horizontal axis). In this way, the carriage section 21 can be guided in the extension direction 2 and supported in the lateral direction (preferably in the vertical direction). In other words, the carriage section 21 can be supported by the second guiding device 26 against the support surface 14 of the frame track 10 (refer to Figure 12 ).

[0099] As Figure 7As shown, the carriage segments 21 may each 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 means 26. Instead, the number of the second guiding means 26 to be provided within the roller receiving portion 26.1 may be selected based on the expected load to be transmitted by the carriage segments 21. In this way, the carriage segments 21 of the same design can be used with different extension guide rails 1 that may face different load requirements.

[0100] As can be seen from Figure 7 and Figure 8 it can be further seen that the carriage segment 21 may include a first lateral guiding means 28. The first lateral guiding means 28 may be provided on the base portion 22 of the carriage segment 21. Preferably, the first lateral guiding means 28 is designed as a roller rotatable about a vertical axis. The first lateral guiding means 28 may guide the carriage segment 21 in the extending direction 2 and provide support in the lateral direction, preferably in the horizontal direction. In other words, the carriage segment 21 may be supported by the first lateral guiding means 28 against the side section 13 of the central track 30 (refer to Figure 12 ).

[0101] As Figure 8 can be seen, the base portion 22 and the upper portion 23 of the carriage segment 21 may be connected by a wall portion 23.1 on one lateral side of the carriage segment 21. In this way, a track receiving portion 27 may be formed between the base portion 22 and the upper portion 23. The track receiving portion 27 may be used to receive a part of the upper wall of the frame track 10 (refer to Figure 12 ). The upper wall may include a support surface 14 on its upper side.

[0102] Furthermore, the carriage segment 21 may be equipped with a guiding projection 23.2 that projects from the upper portion 23 in the lateral direction and downward toward the base portion 22. The guiding projection 23.2 may be configured to at least partially and / or temporarily engage with the side section 13 of the frame track 10 to improve the lateral guiding of the carriage segment 21, as Figure 12 can be seen.

[0103] The carriage segment 21 may be detachably connected to the link segment 24, and thus may be detachably connected to each other via the link segment 24. As Figure 7 and Figure 8 shown, the connection may 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 segment 21, and the connection element 24.2 is arranged at the link segment 24. However, different arrangements can be envisioned.

[0104] As in Figure 8As can best be seen, the connection mating element 21.3 can be provided at the base portion 22 of the carriage section 21.

[0105] 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.

[0106] 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, and the connection recess 21.6 can be formed in the wall of the connection receiving portion 21.4.

[0107] Furthermore, one or more connection protrusions 21.5 can be present within the connection receiving portion 21.4. The connection protrusions 21.5 can protrude from the wall of the connection receiving portion 21.4 towards its interior. Thus, the connection insert 24.4 can include one or more connection retractions 24.5, and the one or more connection retractions 24.5 can be shaped to at least partially correspond to the connection protrusions 21.5. During insertion of the connection insert 24.4 into the connection receiving portion 21.4, the connection protrusions 21.5 can snap into the connection retractions 24.5.

[0108] In the above-described manner, the force transmission between the connection element 24.2 and the connection mating element 21.3 can be achieved substantially in a form-locked manner. However, it can be envisioned that, at least partially, the force transmission can be achieved in a friction-locked manner. In particular, an interference fit can be provided at least to some extent between the connection element 24.2 and the connection mating element 21.3. This can be a complement to the above-described components of the connection element 24.2 and the connection mating element 21.3, which can provide form-locked force transmission to a large extent.

[0109] In the illustrated embodiment, the carriage section 21 and the link section 24 are arranged continuously with respect to each other in the extension 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, carriage sections 21 of the same type can be used for tracks of different lengths of the extension guide 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.

[0110] As can be seen from Figure 7As can be further seen, the carriage section 21 can also be equipped with an elastically deformable spring attachment 21.2. The spring attachment 21.2 can be connected to the base portion 22 of the carriage section 21. At the Figure 7 left side of the carriage section 21 shown, the spring attachment 21.2 of the carriage section 21 can be used to mitigate the impact of the carriage section 21 against the first stop 14.1 located below the support surface 14 of the frame rail 10 (refer to Figure 1 ). At the Figure 7 right side of the carriage section 21 shown, the spring attachment 21.2 of the carriage section 21 can be used to mitigate the impact of the carriage section 21 against the second stop 13.3 provided at the side section 13 of the frame rail 10 (refer to Figure 1 ).

[0111] As discussed above, the first running surface 61 can be provided on the attachment element 70, which can be detachably connected to the frame rail 10. The attachment element 70 can be a single part. However, preferably and according to the embodiment shown in the figures, the attachment element 70 can be designed as multiple parts. For example, as Figure 1 shown, the attachment element 70 can include a first attachment section 71 and a second attachment section 75, and the first attachment section 71 and the second attachment section 75 can follow each other in the extending direction 2. Thus, the first running surface 61 can be arranged on the two attachment sections 71, 75.

[0112] The preferred way to detachably connect the attachment element 70 to the frame rail 10 can be as follows: As Figure 1 shown, a receiving element 13.1 can be provided on the side section 13 of the frame rail 10. The receiving element 13.1 can be in a hook shape. Corresponding to the receiving element 13.1, the attachment element 70 can include a receiving portion 73 that can receive the receiving element 13.1 (refer to Figure 5 ). The receiving portion 73 can be accessed from below, such that the attachment element 70 can be connected to the frame rail 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 frame rail 10 at least in the extending direction 2 and in the lateral horizontal direction perpendicular to the extending direction 2.

[0113] In addition, the attachment element 70 can include a latch projection 74 that projects towards the side section 13 of the frame rail 10 (refer to Figure 5 ). The latch projection 74 can be received in a correspondingly designed positioning receiving portion 13.2 provided on the side section 13. The latch projection 74 can snap into the positioning receiving portion 13.2 during the lowering of the attachment element 70, that is, while inserting the receiving element 13.1 into the receiving portion 73.

[0114] As can be seen from Figure 1 As can be seen from Figure 1 , the extension guide rail 1 may include a first guiding device 72 for guiding the central rail 30 and for supporting the central rail 30 in the horizontal direction. The first guiding device 72 may be designed as a first guiding roller 72.2 rotatable about a vertical axis. The first guiding device 72 may be connected to the frame rail 10. Preferably, and as shown in the figure, the first guiding device 72 is provided on the attachment element 70.

[0115] 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 receive 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.

[0116] As Figure 1 As shown in Figure 1 , the attachment element 70 may include more than one first guiding device receiving portion 72.1. In addition, each of the attachment segments 71, 75 may include more than one first guiding device receiving portion 72.I. However, not all of the first guiding device receiving portions 72.1 need to be equipped with the first guiding device 72. Instead, the number of first guiding devices 72 to be provided within the first guiding device receiving portion 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 guide rails 1 that may face different load requirements.

[0117] As Figure 12 As best seen in Figure 12 , at least a portion of the first guiding 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.

[0118] Returning to Figure 1 Figure 1 , it can be seen that the first guiding device 72 may be substantially provided 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 guiding device 72, for example designed in consideration of the requirements for guiding the central rail 30.

[0119] Figure 11 shows a schematic side view of the extension guide rail 1, and Figure 12 shows a cross-sectional view at position XII according to Figure 11 Perhaps based onFigure 12 Best explains the way in which the load (e.g., the load due to the weight of the drawer) is transferred to the furniture frame.

[0120] As described above, the drawer track 50 can be attached to the movable furniture part. The vertical load can be transferred between the top wall 52 of the drawer track 50 and the top wall 32 of the central track 30 through the third guiding means 46 of the outer carriage 40. The horizontal load can be transferred between one side wall 51 of the drawer track 50 and the first side wall 31 of the central track 30 through the third lateral guiding means 45.1 of the outer carriage 40. In addition, the horizontal load can be transferred between the other side wall 51 of the drawer track 50 and the second side wall 33 of the central track 30 through the fourth lateral guiding means 48 of the outer carriage 40. Additionally, the vertical load that may cause the drawer track 50 to lift off from the central track 30 can be compensated for by the lifting rollers 35 provided on the side walls 31, 33 of the central track 30, and the lifting rollers 35 can engage with the curved portions 51.1, 53.1 of the side wall 53 adjacent to the drawer track 50 (refer to Figure 1 ).

[0121] Between the top wall 32 of the central track 30 and the support surface 14 of the frame track 10, the vertical load can be transferred through the second guiding means 26 of the inner carriage 20. In addition, the vertical load can be transferred between the first curved portion 31.1 and the upper section of the frame track 10 through the second guiding means 26 provided on the base 22 of the inner bracket 20, and the first curved portion 31.1 is angled away 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 transferred between the first side wall 31 of the central track 30 and the side section 13 of the frame track 10 through the first lateral guiding means 28 of the inner carriage 20. In addition, the horizontal load can be transferred between the second side wall 33 of the central track 30 and the side section 13 of the frame track 10 through the first guiding means 72 that can be provided on the attachment element 70.

[0122] Hereinafter, the functions of the presented embodiments of the extension guide rail 1 according to the present invention are explained based on the extension (opening) and retraction (closing) operations of the movable furniture part.

[0123] 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

[0124] In the retracted state, the movement of the inner carriage 20 against the extension direction 2 can be inhibited by the spring attachment 21.2 resting against the first stop portion 14.1 of the frame track 10 in the extension direction 2.

[0125] The movement of the central rail 30 against the extending direction 2 can be suppressed by resting the outer carriage 40 against the stopper 32.2 provided on the central rail 30 (refer to Figure 4 ). This can suppress the movement of the outer carriage 40 against the extending direction 2. Therefore, the rotation of the second synchronizing wheel 63 in the counterclockwise direction as seen in Figure 1 can be suppressed. Therefore, since the first synchronizing wheels 62, 63 can be connected in a rotationally fixed manner, the rotation of the first synchronizing wheel 62 in the counterclockwise direction can be suppressed. Based on this, the relative movement between the first synchronizing wheel 62 and the first running surface 61 can be suppressed, thereby suppressing the relative movement between the central rail 30 and the frame rail 10.

[0126] The movement of the drawer rail 50 against the extending direction 2 can be suppressed by resting the stopper 56 of the drawer rail 50 against the mating stopper 41.3 located at the first running section 41 (refer to Figure 1 , Figure 4 and Figure 6 ).

[0127] During the opening movement of the drawer, the drawer rail 50 can move relative to the central rail 30 in the extending direction 2. The outer carriage 40 can move relative to the central rail 30 through the third guiding device 46, the fourth lateral guiding device 48, and the third lateral guiding device 45.1 that roll between the corresponding walls of the outer carriage 40 and the central rail 30. The outer carriage 40 can move relative to the central rail 30 at half the speed of the relative movement between the drawer rail 50 and the central rail 30.

[0128] The relative movement between the outer carriage 40 and the central rail 30 can cause the second synchronizing wheel 63 to roll on the second running surface 65. In this way, the second synchronizing wheel 63 can rotate through the relative movement between the outer carriage 40 and the central rail 30.

[0129] The rotation of the second synchronizing wheel 63 can be transmitted to the first synchronizing wheel 62, which can be connected to the first synchronizing wheel 62 in a rotationally fixed manner. The resulting rotation of the first synchronizing wheel 62 can cause the first synchronizing wheel 62 to roll on the first running surface 61. That is, the rotation of the first synchronizing wheel 62 can cause the relative movement between the central rail 30 and the first running surface 61, and thus can cause the relative movement between the central rail 30 and the frame rail 10.

[0130] The inner carriage 20 can move relative to the frame rail 10 by means of the second guiding device 26 and the first lateral guiding device 28 that roll inside between the corresponding walls of the central rail 30 and the frame rail 10. The inner carriage 20 can move relative to the frame rail 10 at half the speed of the relative movement between the central rail 30 and the frame rail 10.

[0131] The speed relationship between the moving track and / or the carriage may depend on the ratio of the diameter of the first synchronizing wheel 62 to the diameter of the second synchronizing wheel 63.

[0132] In the illustrated embodiment, the synchronizing 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 skeleton track 10 and the central track 30. If the above-mentioned diameter ratio is selected to be 2, the speed relationship between the skeleton track 10, the inner carriage 20, the central track 30, the outer carriage 40, and the drawer track 50 may 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 figures, the relationship may be 0∶1 / 4∶1 / 2∶3 / 4∶1. This may be the preferred relationship because it provides a uniform distribution of the speed and the travel length of the track and the carriage of the extension guide 1 during extension and retraction.

[0133] When the movable furniture part is in the fully open state, the extension guide 1 may be in the fully extended state.

[0134] In the extended state, further movement of the inner carriage 20 in the extension direction 2 can be inhibited by resting the spring attachment 21.2 on the second stop portion 13.3 of the skeleton track 10 facing the extension direction 2.

[0135] Further movement of the central track 30 in the extension direction 2 can be inhibited by resting the outer carriage 40 against the stop portion 31.2 provided on the central track 30 using its spring attachment 42.1 (refer to Figure 4 ). This can inhibit further movement of the outer carriage 40 in the extension direction 2. Therefore, further rotation of the second synchronizing wheel 63 in the clockwise direction as seen in Figure 1 can be inhibited. Therefore, since the first synchronizing wheels 62, 63 can be connected in a rotationally fixed manner, rotation of the first synchronizing wheel 62 in the clockwise direction can be inhibited. Therefore, relative movement between the first synchronizing wheel 62 and the first running surface 61 can be inhibited, thereby inhibiting further relative movement between the central track 30 and the skeleton track 10 in the extension direction 2.

[0136] Further movement of the drawer track 50 in the extension direction 2 can be inhibited by resting a stop portion (not shown in the figures) of the drawer track 50 located inside the side wall 51 on the spring attachment 42.2 located at the second running section 42 (refer to Figure 1 , Figure 4 and Figure 6 ).

[0137] From the open state, the closing of the movable furniture part can guide the extension guide rail 1 back to the retracted state described above. For the closing process, the same explanations as given above for the opening process apply analogously.

Claims

1. An extension guide rail (1) for mounting a movable furniture part that can move linearly in an extension direction (2), the extension guide rail (1) comprising: A frame rail (10) that can be fixed to a furniture frame; A drawer rail (50) that can be fixed to the movable furniture part; A central rail (30) that can move linearly and is arranged between the frame rail (10) and the drawer rail (50); At least one load-transfer inner carriage (20) arranged between the frame rail (10) and the central rail (30); and At least one load-transfer outer carriage (40) arranged between the central rail (30) and the drawer rail (50); Characterized in that The inner carriage (20) is formed by a plurality of segments (21, 24) connected to each other, preferably detachably connected; and / or The outer carriage (40) is formed by a plurality of segments (40.1, 41, 42) connected to each other, preferably detachably connected.

2. The extension guide rail (1) according to claim 1, Characterized in that The inner carriage (20) has at least two carriage segments (21) connected to each other indirectly or directly.

3. The extension guide rail (1) according to claim 2, Characterized in that The connection between the carriage segments (21) is established through a connection element (24.2) and a connection mating element (21.3), and the connection preferably realizes form-locking force transmission, friction-locking force transmission, friction locking and form-locking force transmission.

4. The extension guide rail (1) according to claim 3, Characterized in that The connection element (24.2) has a connection insert (24.4); The connection mating element (21.3) has a connection receiving portion (21.4) designed to at least partially correspond to the connection insert (24.4); and The connection insert (24.4) can be at least partially received in the connection receiving portion (21.4).

5. The extension guide rail (1) according to claim 4, Characterized in that The connection element (24.2) has a connection neck (24.6), and the connection neck (24.6) has a smaller cross-section than the connection insert (24.4); The connection mating element (21.3) has a connection recess (21.6) in the wall of the connection receiving portion (21.4); The connection recess (21.6) is designed to at least partially correspond to the connection neck (24.6); and The connection neck (24.6) can be at least partially received in the connection recess (21.6).

6. The extension guide rail (1) according to claim 4 or 5, Characterized in that The connection mating element (21.3) has at least one connection protrusion (21.5) and / or at least one connection retraction (24.5) in the region of the connection receiving portion (21.4); The connecting element (24.2) has at least one connecting recess (24.5) that at least partially corresponds to the connecting projection (21.5) of the connecting mating element (21.3), and / or has at least one connecting projection (21.5) that at least partially corresponds to the connecting recess (24.5) of the connecting mating element (21.3); wherein the connecting projection (21.5) can be at least partially received in the respectively corresponding connecting recess (24.5).

7. The telescopic guide rail (1) according to any one of claims 2 to 6, characterized in that the inner carriage (20) has at least one linking section (24), and the carriage sections (21) are connected to each other by means of the linking section (24); the carriage sections (21) and the linking section (24) are preferably arranged continuously in the telescopic direction (2); in particular, a linking section (24) follows the first carriage section (21), and another carriage section (21) follows the linking section (24).

8. The telescopic guide rail (1) according to any one of claims 3 to 7, characterized in that at least one carriage section (21) and / or at least one linking section (24) has a connecting element (24.2) or a connecting mating element (21.3) at the front end and / or the rear end when observed with respect to the telescopic direction (2).

9. The telescopic guide rail (1) according to any one of claims 1 to 8, characterized in that at least one carriage section (21) is provided with at least one second guiding device (26); the second guiding device (26) is preferably designed as a roller; by means of the second guiding device (26), guiding of the carriage section (21) in the direction of the telescopic direction (2) and support transverse to the telescopic direction (2) are achieved, in particular support in the vertical direction; the second guiding device (26) is at least partially in contact with the support surface (14) of the frame rail (10); and / or the carriage section (21) is provided with at least one first lateral guiding device (28); the first lateral guiding device (28) is preferably designed as a roller; by means of the first lateral guiding device (28), guiding of the carriage section (21) in the direction of the telescopic direction (2) and support transverse to the telescopic direction (2) are achieved, in particular support in the horizontal direction; and the first lateral guiding device (28) is at least partially in contact with the side section (13) of the frame rail (10).

10. The telescopic guide rail (1) according to any one of claims 1 to 9, characterized in that the outer carriage (40) has at least two running sections (41, 42), and the at least two running sections are connected to each other indirectly or directly; wherein the connection preferably enables form-locking force transmission, friction-locking force transmission, or friction-locking and form-locking force transmission.

11. The telescopic guide rail (1) according to claim 10, characterized in that: Said connection is established by means of at least one latching projection (40.2), preferably in the shape of a tongue, and a latching receptacle (41.1) which at least partly corresponds to said latching projection (40.2); wherein said latching projection (40.2) can be at least partly received in said latching receptacle (41.1); and wherein at least one of said running segments (41, 42) has at least one latching projection (40.2) and / or at least one latching receptacle (41.1).

12. The telescopic guide rail (1) according to claim 11, characterized in that said latching projection (40.2) has at least one latching element (40.3), which is preferably designed as a latching nose; said latching receptacle (41.1) has at least one latching stop (41.2); and the latching connection between said latching projection (40.2) and said latching receptacle (41.1) is established at least partly by said latching element (40.3) engaging at least partly behind said latching stop (41.2).

13. The telescopic guide rail (1) according to any one of claims 10 to 12, characterized in that said outer carriage (40) has at least one base segment (40.1), by means of which said running segments (41, 42) are connected to one another; said running segments (21) are preferably arranged in opposite end regions of said base segment (40.1) with respect to said extending direction (2).

14. The telescopic guide rail (1) according to claim 13, characterized in that said base segment (40.1) has at least one latching projection (40.2) and / or at least one latching receptacle (41.1).

15. The telescopic guide rail (1) according to any one of claims 10 to 14, characterized in that at least one of said running segments (41, 42) has at least one third guiding means (46), which is preferably designed as a roller; by means of said third guiding means (46), guiding of said running segments (41, 42) in the direction of said extending direction (2) and support transverse to said extending direction (2), in particular support in the vertical direction, are achieved; said third guiding means (46) is in contact at least partly with the top wall (32) of said central track (30); and / or said running segments (41, 42) have at least one third lateral guiding means (45.1), which is preferably designed as a roller; by means of said third lateral guiding means (45.1), guiding of said running segments (41, 42) in the direction of said extending direction (2) and support transverse to said extending direction (2), in particular support in the horizontal direction, are achieved; and said third lateral guiding means (45.1) is in contact at least partly with the first side wall (31) of said central track (30).

16. The telescopic guide rail (1) according to any one of claims 13 to 15, characterized in that The base section (40.1) has at least one fourth lateral guiding device (48), which is preferably designed as a roller; The guiding of the base section (40.1) in the direction of the extension direction (2) and the support transverse to the extension direction (2), in particular in the horizontal direction, are achieved by means of the fourth lateral guiding device (48); and The fourth lateral guiding device (48) is at least partially in contact with the second side wall (33) of the central track (30).

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