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) fixable to a furniture framework, a drawer rail (50) fixable to a movable furniture part, a linearly movable central rail (30) arranged between the framework rail (10) and the drawer rail (50), at least one load-transmitting outer carriage (40) arranged between the central rail (30) and the drawer rail (50), and a synchronization device (60). As a result of the synchronization device (60) acting between the skeleton rail (10) and the outer carriage (40), improved wear resistance is obtained.

Description

Technical Field

[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, at least one load-transfer outer carriage disposed between the central rail and the drawer rail, and a synchronization device.

[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 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, the drawer can linearly move along the extension 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 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 the outer carriage. The outer carriage can include suitable means for relative movement, such as rollers that can roll between the drawer rail and the central rail. The outer carriage can linearly move in the extension 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 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 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-transfer inner carriage disposed between the skeleton rail and the central rail. The inner carriage can linearly move in the extension direction.

[0006] To achieve a reproducible and uniform movement of the rails relative to each other, a synchronization device capable of achieving synchronization can be provided, that is, defining the position and / or speed relationship between a single, multiple, or all of the rails and / or carriages that define 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 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 guides include a carcass track, a central track, and a first carriage arranged therebetween. The extension guides further include a drawer track and a second carriage arranged between the central track and the drawer track. In addition, synchronizing means are provided which are 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] Even if the extension guides are provided with synchronizing means, the tracks and / or carriages of the extension guides which are not directly synchronized by the synchronizing means may eventually deviate from their defined positions. This is clearly undesirable in one aspect.

[0010] However, on the other hand, allowing the components to deviate from their defined positions can be used in some cases to protect the extension guides from excessive wear or even failure. For example, the user may pull out or push in the drawer very forcefully. Or, as another example, the user may accidentally bump into the drawer in its open state. In both cases, there will be large forces acting on the extension guides, mainly in the extension direction or the opposite direction of the extension direction. Such forces can be dissipated at least in part by components of the extension guides that are able to yield to a certain extent. For example, the sliding of the carriage between the two tracks can allow one track of the extension guides to move relative to the other track. That is to say, the sliding can dissipate the impact to a certain extent. Obviously, this cannot be achieved between two tracks connected to each other by the synchronizing means.

[0011] In the extension guides known in the art, in the case where the synchronizing means act between the inner carriage and the drawer track, following the manner of the impact force, the synchronizing means will face the entire impact force because it is directly connected to the drawer track. The first component that can yield is the inner carriage that can slide on the carcass guide. This means that the impact will act directly on the synchronizing means, which may include mechanically rather delicate components and may therefore wear or even fail prematurely. Summary of the Invention

[0012] The technical problem to be solved by the present invention is to provide an extension guide with improved wear resistance.

[0013] The solution to this task lies in the fact that the synchronizing device acts between the carcass rail and the outer carriage.

[0014] In this way, the drawer rail does not need to be directly connected to the synchronizing device. In the situation described above, extreme forces may act on the extension guide in the extension direction, and the drawer rail may thus yield to some extent due to sliding on the outer carriage. This means that the synchronizing device is protected from impacts that may act on the movable furniture part. This allows the synchronizing device to be better protected against premature wear (mechanical failure in the worst case).

[0015] Furthermore, the carcass rail can be considered as a preferred reference basis for synchronization. Compared with other rails and carriages of the extension guide, the carcass rail can be fixedly attached to the cabinet in a stationary manner. Therefore, the extension guide according to the present invention can provide enhanced synchronization capabilities because the synchronizing device has a fixed stationary basis.

[0016] If it is stipulated that the synchronizing device includes at least a first running surface and a second running surface, at least one synchronizing wheel rolls on at least one running surface, and the first running surface is indirectly or directly connected to the carcass rail in a stationary manner, reliable and accurate synchronization can be achieved through a compact design. In the present application, direct connection may mean that the first running surface is integrally connected to the carcass rail. For example, the carcass rail and the first running surface can be formed as an integral part. Indirect connection may mean that the first running surface is designed as a separate part or a component of a separate part, and this separate part can be connected to the carcass rail.

[0017] If it is further stipulated that the second running surface is directly or indirectly connected to the outer carriage, an effective synchronizing device between the carcass rail and the outer carriage can be achieved in an advantageous manner. In the present application, direct connection may mean that the first and second running surfaces are integrally connected to the carcass rail. For example, the outer carriage and the second running surface can be formed as an integral part. Indirect connection means that the second running surface is designed as a separate part or a component of a separate part, and this separate part can be connected to the outer carriage.

[0018] If it is stipulated that at least one synchronizing wheel is rotatably mounted on the central rail, the central rail can also be synchronized by the synchronizing device. Furthermore, the central rail can be designed as a mechanically robust component and thus provide a reliable mounting base for at least one synchronizing wheel.

[0019] Preferably, the at least one synchronizing wheel is rotatable about an axis perpendicular to the extension direction, in particular about a horizontal axis. In this case, the rolling direction of the at least one synchronizing wheel can be aligned with the extension direction.

[0020] According to a preferred embodiment of the present invention, it can be provided that the first running surface and / or the second running surface is designed to be toothed, in particular designed as a rack, and at least one synchronizing wheel is designed as a pinion. Thus, the synchronizing wheel can mesh with the corresponding running surface. The rack and pinion design of the running surface and the synchronizing wheel running on the running surface enables precise synchronization and reliable force transmission between the running surface and the synchronizing wheel, especially the force acting in the extending direction.

[0021] If a first synchronizing wheel and a second synchronizing wheel are provided, the first synchronizing wheel rolls on the first running surface, and the second synchronizing wheel rolls on the second running surface, then the position and / or speed relationship between the single, multiple or all tracks and / or carriages of the extending guide rail can be set by appropriately designing the first synchronizing wheel and the second synchronizing wheel (for example, by selecting the appropriate diameters of the first synchronizing wheel and the second synchronizing wheel). In other words, the transmission ratio of the synchronizing device can be selected according to the application requirements.

[0022] In the present application, if the synchronizing wheels are connected to each other in a rotationally fixed manner, a mechanically robust and kinematically simple transmission can be achieved.

[0023] If it is provided that the second synchronizing wheel has a head portion and a shaft portion, the first synchronizing wheel has a hub, the hub is designed to at least partially correspond to the shaft portion, and the synchronizing wheels are connected to each other in a rotationally fixed manner by at least partially receiving the shaft portion in the hub, then the synchronizing wheels can be easily and firmly connected to each other during assembly.

[0024] In an alternative, it can be provided that the first synchronizing wheel has a head portion and a shaft portion, and the second synchronizing wheel has a hub.

[0025] If the shaft portion is provided with splines at least in a region, the hub is provided with mating splines at least in a region that at least partially correspond to the splines, and torque can be transmitted between the second synchronizing wheel and the first synchronizing wheel through the splines and the mating splines (preferably in a form-locking manner), then reliable transmission of torque between the synchronizing wheels and defined angular positioning of the synchronizing wheels relative to each other can be achieved.

[0026] If it is provided that the shaft portion is guided through a shaft opening in the wall of the central track, a robust mounting of the synchronizing wheel can be achieved.

[0027] In the present application, if it is further specified that the first synchronizing pulley and the second synchronizing pulley are arranged on opposite sides of the wall, a compact design of the synchronizing device can be achieved. For example, the central track may include a vertical first side wall and a second side wall, which may be connected by a horizontal top wall, forming an internal space between the walls. In this case, the synchronizing pulleys may preferably be arranged on opposite sides of the side walls. In addition, the top wall may be provided with a synchronizing pulley breakthrough portion, which may be an opening in the top wall, such that the synchronizing pulley located on the inner side may partially extend through the synchronizing pulley breakthrough portion, which may provide a space-saving design.

[0028] Easy and firm installation of the synchronizing pulleys and good rotatability can be achieved because the first synchronizing pulley and the second synchronizing pulley are detachably mounted on the central track by means of a synchronizing pulley holder, the synchronizing pulley holder having a receiving space in which the first synchronizing pulley is partially received, the synchronizing pulley holder having a bearing portion through which the shaft portion is guided, and in the receiving space, relative to the first synchronizing pulley and opposite to the bearing portion, a bearing accommodation portion is provided in which the bearing projection of the shaft portion is rotatably received.

[0029] If it is further specified that the synchronizing pulley holder has a retaining projection, which is preferably designed as a tongue, the central track has a retaining device, which preferably has a hook-shaped design, the retaining projection is held between the retaining device and the wall of the central track, the synchronizing pulley holder further includes a retaining lug, which is preferably hook-shaped, and the retaining lug is held at the latch hole of the central track, wherein the retaining lug preferably penetrates the latch hole to establish a latching connection, the synchronizing pulley holder can be easily and firmly attached to the central track during assembly.

[0030] According to a preferred embodiment of the present invention, it may be specified that the ratio of the diameter of the first synchronizing pulley to the diameter of the second synchronizing pulley is greater than or equal to 1, preferably greater than or equal to 1.5, and particularly preferably 2.

[0031] During the retraction or extension of the extension guide, i.e., during the pulling out or pushing in of the movable furniture part, the drawer track, the outer carriage, the central track, and / or the inner carriage may move relative to the skeleton track at a corresponding speed in the extension direction / against the extension direction.

[0032] Assume that the synchronous pulley is installed on the central track, the second running surface is connected to the outer carriage, and the inner carriage is arranged between the skeleton track and the central track. If the above diameter ratio is selected as 1, the speed relationships among the skeleton track, the inner carriage, the central track, the outer carriage, and the drawer track can be 0, 1 / 6, 1 / 3, 2 / 3, 1 (assuming the speed of the drawer track is 1). If the above diameter ratio is selected as 2, the speed relationships among the skeleton track, the inner carriage, the central track, the outer carriage, and the drawer track can be 0, 1 / 4, 1 / 2, 3 / 4, 1, which 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 during extension and retraction.

[0033] In the present application, if the synchronous pulley is designed as a pinion, the tooth number ratio set on the synchronous pulley can correspond to the diameter ratio. For example, the first synchronous pulley can be provided with twelve teeth, while the second synchronous pulley can be provided with six teeth.

[0034] It can be conceived that if the above assumptions are not met, for example, if the synchronous pulley is not installed on the central track but on another track or carriage, the speed relationship may be different from the mentioned speed relationship. However, in any case, the ratio of the diameter of the first synchronous pulley to the diameter of the second synchronous pulley can be designed in a way to achieve a favorable speed and travel relationship among the components of the extension guide.

[0035] According to an advantageous further development of the present invention, it is proposed to provide an attachment element which is preferably detachably connected to the skeleton track, and the first running surface is at least in part provided on the attachment element. In particular, the first running surface is integrally designed with the connecting element in the area. Thus, the first running surface can be manufactured separately from the skeleton track. This enables different types of first running surfaces to be designed and manufactured, which can be used with the same type of skeleton track for different applications. In addition, for example, if the first running surface is worn, the attachment element can be replaced without the need to replace the entire extension guide or the skeleton track.

[0036] In the present application, the attachment element can also be designed in multiple parts, in particular having at least two attachment segments, and the first running surface is particularly preferably at least in part provided on the attachment segments. In this way, the same parts can be used for skeleton tracks of different lengths and / or first running surfaces of different lengths. For example, a longer track may require a longer first running surface and thus more than one attachment segment can be provided, while for a shorter track, one connecting segment is sufficient.

[0037] An attachment element can be easily and firmly mounted to a carcass rail if it is provided that the attachment element is detachably connected to the carcass rail by means of a latch connection, preferably at least one receiving element is provided on the carcass rail, which receiving element is in particular hook-shaped and is received in a receiving portion of the attachment element, which receiving portion at least partially corresponds to the receiving element, and further preferably at least one latch projection is provided on the attachment element, which latch projection is received in a positioning receiving portion of the carcass rail, which positioning receiving portion is designed to at least partially correspond to the latch projection.

[0038] According to an advantageous embodiment of the invention, it is proposed to provide a first guiding device for guiding a central rail and supporting the central rail transversely to the extending direction, and the first guiding device is indirectly or directly connected to the carcass rail in a stationary manner. In the present application, a stationary connection means that the first guiding devices do not change their position relative to the carcass rail during the extension or retraction of the movable furniture part. However, rotation about a stationary axis is considered to be stationary.

[0039] The first guiding devices connected to the carcass rail in a stationary manner offer the advantage that they can be freely spaced apart according to the requirements for lateral guidance that the extension guide needs 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 invention, the first guiding devices do not change their position relative to the carcass guide during extension or retraction. This can provide optimal guidance and load transfer between the carcass guide and the central rail, regardless of the state of the extension guide (retracted, extended or intermediate state).

[0040] In contrast, if the first guiding devices are provided on the carriage, as according to the prior art, the spacing of the guiding devices is limited by the length of the carriage on which the guiding devices are mounted. Furthermore, during the extension and withdrawal of the movable furniture part, the carriage moves relative to the central rail and the carcass 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 carcass rail and the central rail is variable and thus not optimal in each state.

[0041] If, in addition to the extension guide rails, a push-out mechanism acting between the furniture carcass and the movable furniture part (such as a drawer) is provided, 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 arranged on both lateral sides of the drawer. It is conceivable that the user does not apply the overtravel to the center of the drawer or only applies it to one side. In both cases, the overtravel applied by the user needs 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 has not been reached on both sides of the drawer. For example, the drawer can 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.

[0042] These problems can be overcome by the advantageous embodiments of the present invention described above by providing improved lateral guidance.

[0043] If the first guiding device is also provided at least in the region of the first running surface adjacent thereto, a compact design is achieved. Preferably, the first guiding device can be arranged on an attachment element which is preferably detachably connected to the carcass rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be explained in more detail below with reference to examples of embodiments shown in the drawings. The drawings show:

[0045] Figure 1 : A schematic exploded view of the extension guide rail 1;

[0046] Figure 2 : According to Figure 1 The enlarged view of detail II;

[0047] Figure 3 : Figure 3 The schematic exploded view of the components shown in;

[0048] Figure 4 : A schematic view of the central rail 30 in combination with the synchronizing device 60;

[0049] Figure 5 : According to Figure 4 The cross-sectional view at position V;

[0050] Figure 6 : A schematic exploded view of the outer carriage 40;

[0051] Figure 7 : Schematic exploded view of the inner carriage 20;

[0052] Figure 8 : According to Figure 7 Enlarged view of detail VIII;

[0053] Figure 9 : Cropped schematic view of the attachment element 70;

[0054] Figure 10 : According to Figure 1 Enlarged view of detail X;

[0055] Figure 11 : Schematic side view of the extension guide 1;

[0056] Figure 12 : According to Figure 11 Cross-sectional view at position XII; Detailed implementation

[0057] Figure 1 Shows a schematic exploded view of the extension guide 1. Accordingly, the extension guide 1 may include a drawer track 50 and a frame track 10.

[0058] The drawer track 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 track 50. Additional connection points or fastening structures may be provided for direct or indirect connection to the movable furniture part.

[0059] The frame track 10 may be fixed to a furniture frame, for example fixed to a cabinet. As Figure 1 shown, the frame track 10 may include a fastening section 11 provided with mounting holes 11.1. In this case, the frame track 10 may be fixed to the furniture frame with a suitable fixing device, for example with screws passing through the mounting holes 11.1 and engaging with the furniture frame.

[0060] The frame track may further include a bottom 12, 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 their opposite sides. Adjacent to the side section 13 at a right angle, an upper section of the frame track 10 may be provided, which may be provided with a support surface 14 on its upper side.

[0061] As can be further seen in Figure 1 the extension guide 1 may additionally include a central track 30 arranged between the frame track 10 and the drawer track 50.

[0062] 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.

[0063] 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 disposed 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.

[0064] 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 disposed 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.

[0065] 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.

[0066] 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 track 10. In other words, the first running surface 61 of the embodiment shown in the figure is indirectly connected to the skeleton track 10. However, it is conceivable to provide the first running surface 61 which is directly connected to the skeleton track 10, for example, integrally provided with the skeleton track 10. In any case, preferably, the first running surface 61 is connected to the skeleton 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 skeleton track 10.

[0067] 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 the outer carriage 40 and connected to the outer carriage 40, especially similar to the first running surface 61 (which is preferably indirectly connected to the skeleton track 10).

[0068] 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.

[0069] 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 track 30.

[0070] Preferably, the second synchronization wheel 63 and the first synchronization wheel 62 are arranged on opposite sides of the wall of the central track 30. In the embodiment shown, the synchronization wheels 62, 63 are arranged on opposite sides of the second side wall 33 of the central track 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 track 30.

[0071] Near the breakthrough part 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 into a small plate. The support plate 36 can be fixed to the top wall 32 in any suitable manner and can partially protrude above the edge formed between the top wall 32 and the second side wall 33. Therefore, as Figure 2 shown, the support plate 36 can be partially located above the second synchronous pulley 63.

[0072] The preferred way to install the synchronous pulleys 62, 63 onto the central track 30 may be referred to Figure 3 for the best explanation, Figure 3 shown Figure 2 in the schematic exploded view of the components shown.

[0073] 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, preferably to 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.

[0074] Similarly, the first synchronous pulley 62 can 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 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.

[0075] 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.

[0076] 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 diameters can be the inner diameters, outer diameters or pitch diameters of the pinions.

[0077] 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.

[0078] 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 can be provided at the shaft portion 63.2, and the spline 63.3 is configured to engage with at least partially corresponding mating splines 62.2 provided at the hub 62.1. The spline 63.3 and the mating splines 62.2 can be of any suitable type.

[0079] In addition, the central track 30 can include a shaft opening 33.4 through which the shaft portion 63.2 can be guided. 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.

[0080] As can be further seen Figure 3 A synchronous pulley retainer 64 can be provided to mount the first synchronous pulley 62 and the second synchronous pulley 63 to the central track 30. The synchronous pulley retainer 64 can include a retaining projection 64.3 which, as shown, 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.

[0081] The synchronous pulley 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 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 a 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.

[0082] The synchronizing wheel holder 64 may include a receiving space 64.1, and the first synchronizing wheel 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 synchronizing wheel 63 may be received in the bearing receiving portion 64.6 and rotatably supported therein. In addition, the synchronizing wheel holder 64 may include a bearing portion 64.2, and the bearing portion 64.2 may be configured to support a 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 may preferably be designed as a hole and may be further preferably positioned opposite to the bearing receiving portion 64.6.

[0083] In this way, the synchronizing wheel holder 64 may 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 synchronizing wheel holder 64 may at least partially protrude into the shaft opening 33.4, as can be best seen in Figure 5 . This may provide additional support for the synchronizing wheel holder 64 on the central track 30.

[0084] Once the synchronizing wheel holder 64 is fixed to the central track 30, the first synchronizing wheel 62 may be partially inserted into the receiving space 64.1. Then, the second synchronizing wheel 63 may 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 synchronizing wheel 63 may be received at the bearing receiving portion 64.6. The synchronizing wheels 62, 63 may be rotatably mounted on the central track 30 in this state.

[0085] Figure 4 A schematic perspective view showing the central track 30 combined with the synchronizing device 60, and Figure 5 shows a cross-sectional view at position V according to Figure 4 .

[0086] From Figure 4 's cross-sectional view, it can be clearly seen that the second synchronizing wheel 63 may engage with the second running surface 65 provided on the outer carriage 40, and the first synchronizing wheel 62 may 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 may be attached to the backbone track 10. As described above, in an alternative, it can be envisioned that the first running surface 61 may also be directly provided on the backbone track 10.

[0087] As can be seen from Figure 5 as shown in, 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 synchronizing wheel 63 is connected to the central track 30, the interaction between the support plate 36 and the groove 49 can ensure the proper rolling of the second synchronizing wheel 63 on the second running surface 65, in particular the proper engagement of the synchronizing wheel 63 with the second running surface 65.

[0088] Figure 6 Schematic exploded view showing the outer carriage 40. As Figure 6 shown in, the outer carriage 40 may be formed by a plurality of segments 40.1, 41, 42 that 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.

[0089] 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 illustrated embodiment. 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 perpendicular to the extension direction 2 (preferably a horizontal axis). 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 ).

[0090] As Figure 6 shown in, each of the running segments 41, 42 may 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 that may face different load requirements.

[0091] 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 (refer to Figure 5 ). Accordingly, the third lateral guiding device 45.1 may rotate about a vertical axis.

[0092] Although not visible in the figure, it is preferred that the first running section 41 is also provided with the third lateral guiding device 45.1.

[0093] The running sections 41, 42 may be detachably connected to the base section 40.1 and may thus 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 receiving portion 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 receiving portion 41.1.

[0094] 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.

[0095] 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 matching 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 matching latch receiving portions 41.1. However, different combinations are conceivable.

[0096] 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.

[0097] 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 (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 best seen in Figure 4 and Figure 5 .

[0098] 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 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 disposed at the side guide rail 47 of the base section 40.1.

[0099] 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 (reference Figure 5 ). In other words, the fourth lateral guiding device 48 and the third lateral guiding device 45.1 may be disposed on opposite sides of the central track 30.

[0100] 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.

[0101] 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 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 (reference Figure 1 and Figure 4) Additionally, a spring attachment 42.2 can be arranged such that it is located above the top wall 32 of the central track 30. The 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 (refer to Figure 12 ).

[0102] 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.

[0103] 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 lateral 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 (refer to Figure 12 ).

[0104] As Figure 7 shown, each carriage segment 21 can include more than one roller receiving portion 26.1. However, not all 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 portion 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 extending guide rails 1 that may face different load requirements.

[0105] 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 lateral 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 (refer to Figure 12 ).

[0106] 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 (refer to Figure 12 ). The upper wall can include a support surface 14 on its upper side.

[0107] In addition, the carriage section 21 can be provided with a guiding protrusion 23.2 which protrudes from the upper portion 23 in a lateral direction and downwardly towards the base portion 22. The guiding protrusion 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.

[0108] 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 envisaged.

[0109] As best visible in Figure 8 , the connection mating element 21.3 can be provided at the base portion 22 of the carriage section 21.

[0110] 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. Therefore, the connection receiving portion 21.4 can be designed to at least partially correspond to the connection insert 24.4.

[0111] 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 which can be formed in the wall of the connection receiving portion 21.4.

[0112] 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 which may be shaped to at least 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.

[0113] 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 at least to some extent between the connecting element 24.2 and the connecting mating element 21.3. This may be supplementary 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.

[0114] 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 in turn followed by the second carriage section 21. In this way, carriage sections 21 of the same type may 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.

[0115] As can be further seen from Figure 7 the carriage section 21 may also be provided 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 may 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 7 ). The spring attachment 21.2 of the carriage section 21 shown on the Figure 1 right side of

[0116] may 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 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.

[0117] A preferred way to detachably connect the attachment element 70 to the frame rail 10 may be as follows: As Figure 1 shown, a receiving element 13.1 may be provided on the side section 13 of the frame rail 10. The receiving element 13.1 may be hook-shaped. Corresponding to the receiving element 13.1, the attachment element 70 may include a receiving portion 73 that can receive the receiving element 13.1 (refer to Figure 5 ). The receiving portion 73 may be accessible 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 extension direction 2 and in the lateral horizontal direction perpendicular to the extension direction 2.

[0118] In addition, the attachment element 70 may 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 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., while inserting the receiving element 13.1 into the receiving portion 73.

[0119] 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 that can rotate 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.

[0120] 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 guiding roller 72.2. Preferably, the first guiding 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 that may be provided within the first guiding device receiving portion 72.1.

[0121] 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 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.

[0122] As Figure 12 best seen, at least a portion of the first guide device 72 may contact the inner side of the second sidewall 33 of the central rail 30. In particular, they may roll on the inner side of the second sidewall 33 during the linear movement of the movable furniture part.

[0123] 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.

[0124] 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 best explained based on Figure 12 is the way the load (such as the load due to the weight of the drawer) is transferred to the furniture frame.

[0125] 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 sidewall 51 of the drawer rail 50 and the first sidewall 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 sidewall 51 of the drawer rail 50 and the second sidewall 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 can be compensated for by the lifting rollers 35 provided on the sidewalls 31, 33 of the central rail 30, and the lifting rollers 35 may engage with the curved portions 51.1, 53.1 of the sidewall 53 adjacent to the drawer rail 50 (referenceFigure 1 )。

[0126] 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 means 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 means 26 provided on the base 22 of the inner carriage 20. 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 means 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 means 72 that can be provided on the attachment element 70.

[0127] Hereinafter, the functions of the presented embodiment of the extension guide rail 1 according to the present invention will be explained based on the extension (opening) and retraction (closing) operations of the movable furniture part.

[0128] 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

[0129] 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 skeleton track 10 in the direction opposite to the extension direction 2.

[0130] The movement of the central track 30 against the extension direction 2 can be inhibited by resting the outer carriage 40 against the stop portion 32.2 provided on the central track 30 (refer to Figure 4 ). This can inhibit the movement of the outer carriage 40 against the extension direction 2. Therefore, the rotation of the second synchronous pulley 63 in the counterclockwise direction as seen in Figure 1 can be inhibited. Therefore, since the first synchronous pulleys 62, 63 can be connected in a rotationally fixed manner, the rotation of the first synchronous pulley 62 in the counterclockwise direction can be inhibited. Based on this, the relative movement between the first synchronous pulley 62 and the first running surface 61 can be inhibited, thereby inhibiting the relative movement between the central track 30 and the skeleton track 10.

[0131] The movement of the drawer track 50 against the extension direction 2 can be inhibited 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 ).

[0132] 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 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 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.

[0133] The relative movement between the outer carriage 40 and the central track 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 by the relative movement between the outer carriage 40 and the central track 30.

[0134] 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 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.

[0135] The inner carriage 20 can move relative to the frame track 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 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.

[0136] The speed relationship between the moving tracks and / or carriages can depend on the ratio of the diameter of the first synchronizing wheel 62 to the diameter of the second synchronizing wheel 63.

[0137] 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 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 extending guide rail 1 during extension and retraction.

[0138] When the movable furniture part is in the fully open state, the extension guide rail 1 can be in the fully extended state.

[0139] In the extended state, the further movement of the inner carriage 20 in the extension direction 2 can be inhibited by placing the spring attachment 21.2 facing the extension direction 2 on the second stop portion 13.3 of the frame rail 10.

[0140] The further movement of the central rail 30 in the extension direction 2 can be inhibited by placing the outer carriage 40 with its spring attachment 42.1 against the stop portion 31.2 provided on the central rail 30 (refer to Figure 4 ). This can inhibit the further movement of the outer carriage 40 in the extension direction 2. Therefore, the further clockwise rotation of the second synchronizing wheel 63 as seen in Figure 1 can be inhibited. Therefore, since the first synchronizing wheels 62, 63 can be connected in a rotationally fixed manner, the clockwise rotation of the first synchronizing wheel 62 can be inhibited. Therefore, the relative movement between the first synchronizing wheel 62 and the first running surface 61 can be inhibited, thereby inhibiting the further relative movement between the central rail 30 and the frame rail 10 in the extension direction 2.

[0141] The further movement of the drawer rail 50 in the extension direction 2 can be inhibited 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 (refer to Figure 1 , Figure 4 and Figure 6 ).

[0142] 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 made 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 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 outer carriage (40) arranged between the central rail (30) and the drawer rail (50); and A synchronizing device (60); Characterized in that: The synchronizing device (60) acts between the frame rail (10) and the outer carriage (40).

2. The extension guide rail (1) according to claim 1, Characterized in that, The synchronizing device (60) includes at least a first running surface (61) and a second running surface (65); At least one synchronizing wheel (62, 63) rolls on at least one of the running surfaces (61, 65); and The first running surface (61) is indirectly or directly connected to the frame rail (10) in a stationary manner.

3. The extension guide rail (1) according to claim 2, Characterized in that, The second running surface (65) is directly or indirectly connected to the outer carriage (40).

4. The extension guide rail (1) according to claim 2 or 3, Characterized in that, The at least one synchronizing wheel (62, 63) is rotatably mounted on the central rail (30).

5. The extension guide rail (1) according to any one of claims 2 to 5, Characterized in that, The first running surface (61) and / or the second running surface (65) are designed to be toothed, in particular designed as a rack, and The at least one synchronizing wheel (62, 63) is designed as a pinion.

6. The extension guide rail (1) according to any one of claims 2 to 5, Characterized in that, A first synchronizing wheel (62) and a second synchronizing wheel (63) are provided; The synchronizing wheels (62, 63) are preferably connected to each other in a rotationally fixed manner; The first synchronizing wheel (62) rolls on the first running surface (61); and The second synchronizing wheel (63) rolls on the second running surface (65).

7. The extension guide rail (1) according to claim 6, Characterized in that, The second synchronizing wheel (63) has a head portion (63.1) and a shaft portion (63.2), The first synchronizing wheel (62) has a hub (62.1), Or the first synchronizing wheel (62) has a head portion (63.1) and a shaft portion (63.2), The second synchronizing wheel (63) has a hub (62.1), The hub (62.1) is designed to at least partially correspond to the shaft portion (63.2), and The synchronizing wheels (62, 63) are connected to each other in a rotationally fixed manner by at least partially accommodating the shaft portion (63.2) in the hub (62.1).

8. The extension guide rail (1) according to claim 7, It is characterized in that the shaft portion (63.2) is provided with splines (63.3) at least in a region, the hub (62.1) is provided with mating splines (62.2) at least in a region that at least partially correspond to the splines (63.3), and by means of the splines (63.3) and the mating splines (62.2), torque can be transmitted between the second synchronous pulley (63) and the first synchronous pulley (62), preferably in a form-locking manner.

9. The extension guide rail (1) according to claim 7 or 8, It is characterized in that the shaft portion (63.2) is guided through a shaft opening (33.4) in the walls (31, 32, 33) of the central track (30), preferably such that the first synchronous pulley (62) and the second synchronous pulley (63) are arranged on opposite sides of the walls (31, 32, 33).

10. The extension guide rail (1) according to any one of claims 7 to 9, It is characterized in that the first synchronous pulley (62) and the second synchronous pulley (63) are detachably mounted on the central track (30) by means of a synchronous pulley retainer (64), the synchronous pulley retainer (64) has a receiving space (64.1), and the first synchronous pulley (62) is partially received in the receiving space, the synchronous pulley retainer (64) has a bearing portion (64.2), and the shaft portion (63.2) is guided through the bearing portion (64.2), and in the receiving space (64.1), relative to the first synchronous pulley (62) opposite to the bearing portion (64.2), there is a bearing accommodation portion (64.6), and a bearing projection (63.4) of the shaft portion (63.2) can be rotatably received in the bearing accommodation portion (64.6).

11. The extension guide rail (1) according to claim 10, It is characterized in that the synchronous pulley retainer (64) has a retaining projection (64.3), the retaining projection (64.3) is preferably designed as a tongue, the central track (30) has a retaining device (33.3), the retaining device (33.3) preferably has a hook-shaped design, the retaining projection (64.3) is held between the retaining device (33.3) and the walls (31, 32, 33) of the central track (30), the synchronous pulley retainer (64) further includes a retaining lug (64.5) preferably in a hook shape, and the retaining lug (64.5) is held at a latch hole (33.5) of the central track (30), wherein the retaining lug (64.5) preferably penetrates the latch hole (33.5) to establish a latching connection.

12. The extension guide rail (1) according to any one of claims 6 to 11, It is characterized in that the ratio of the diameter of the first synchronous pulley (62) to the diameter of the second synchronous pulley (63) is greater than or equal to 1, preferably greater than or equal to 1.5, particularly preferably 2.

13. The extension guide rail (1) according to any one of claims 2 to 12, It is characterized in that An attachment element (70) is provided, which is preferably detachably connectable to the skeleton rail (10), and the first running surface (61) is provided at least in the region on the attachment element (70), in particular, the first running surface (61) is integrally designed with the attachment element (70) in the region, the attachment element (70) is preferably designed in multiple parts, in particular having at least two attachment segments (71, 75), and the first running surface (61) is particularly preferably provided at least in the region on the attachment segments.

14. The telescopic guide rail (1) according to claim 13, characterized in that the attachment element (70) is detachably connected to the skeleton rail (10) by means of a latching connection, preferably, at least one receiving element (13.1) is provided on the skeleton rail (10), the receiving element (13.1) is particularly hook-shaped and is received in the receiving portion (73) of the attachment element (70), and the receiving portion (73) at least partially corresponds to the receiving element (13.1), and further preferably, at least one latching projection (74) is provided on the attachment element (70), and the latching projection (74) is received in the positioning seat (13.2) of the skeleton rail (10), and the positioning seat (13.2) is designed to at least partially correspond to the latching projection.

15. The telescopic guide rail (1) according to any one of claims 2 to 14, characterized in that a first guiding device (72) is provided for guiding the central rail (30) and supporting the central rail (30) transversely to the extending direction (2), and the first guiding device (72) is indirectly or directly connected to the skeleton rail (10) in a stationary manner, the first guiding device (72) is preferably provided at least in the region near the first running surface (61) thereof, the first guiding device (72) is particularly preferably provided on the attachment element (70), which is preferably detachably connected to the skeleton rail (10).

Images