Pull-out guide for a piece of furniture

Abstract

A pull-out guide (1) has a drive device (100) which is intended for performing electromotive pulling-out and pushing-in operations and is coupled to a central rail (4) and has an electric motor with a housing (101) and a drive shaft (102). The electromotive drive device (100) is secured in position on a cabinet rail (2), and the drive shaft (102) is coupled to a linear drive (110), which is designed to convert rotational movements of the drive shaft (102) into linear movements of the central rail (4), and / or the electromotive drive device (100) and the synchronization device (5) are formed separately from one another on the rails of the pull-out guide (1).

Description

[0001] Drawer guide for a piece of furniture

[0002] The present invention relates to a drawer guide according to the preamble of claim 1 and a piece of furniture with such a drawer guide.

[0003] A drawer slide of a known type is disclosed in DE 10 2010 060 583 A1. This drawer slide comprises a body rail and a running rail. The drawer slide further includes a center rail arranged between the body rail and the running rail, with rolling bearing devices arranged between the body rail and the center rail on the one hand, and between the center rail and the running rail on the other. The movement of the rails is synchronized by a synchronizing device such that the rails move synchronously and in such a way that, when the drawer slide is extended, retracted, or pushed in, the running rail moves twice as far as the center rail. A wrap-around drive with a rope as the wrap-around element is provided, which is guided circumferentially over two pulleys on the center rail.

[0004] A similar extraction mechanism is also disclosed in AT 505 562 A1. Its disadvantages include the relatively large installation space requirement and the relatively complex design.

[0005] The object of the invention is to provide the generic extension guide with a compactly constructed and highly reliable electromechanical drive device due to its simple design.

[0006] This problem is solved by a drawer slide with the features of claim 1. The invention also provides the furniture or household appliance of claim 21.

[0007] According to claim 1, a drawer guide, in particular for a piece of furniture or household appliance, is created which comprises at least the following:

[0008] - a cabinet rail, in particular attachable to the body of a piece of furniture or a household appliance, a running rail, in particular attachable to a movable part, in particular to a drawer, and a center rail arranged between the cabinet rail and the running rail, wherein sliding bearing devices, in particular rolling bearing devices, are arranged between the cabinet rail and the center rail on the one hand and between the center rail and the running rail on the other hand, so that the drawer slide can be extended and retracted, a synchronization device with which the movement of the center rail and the running rail is synchronized relative to the cabinet rail in such a way that the running rail is not synchronized when being extended or retracted.The drawer slide is moved further each time, preferably twice as far, as the center rail, while the cabinet rail remains stationary, and a drive device for the electromechanical extension and retraction of the drawer slide is coupled to the center rail and has an electric motor with a housing and a drive shaft, wherein the electromechanical drive device is fixed to the cabinet rail and the drive shaft is coupled to a linear drive designed to convert rotary movements of the drive shaft into linear movements of the center rail, and wherein the drive unit and the synchronization device are formed separately from each other on the rails of the drawer slide.

[0009] The latter two features, both individually and especially in combination, result in a particularly compact and, due to its simple design, highly reliable electrically driven drawer slide. This is because these two features—the use of the linear drive and the functional decoupling of the drive unit from the synchronization device, particularly when the latter incorporates a wrap-around gear—have proven highly advantageous for continuous operation, both individually and in combination.

[0010] The piece of furniture can be, for example, a cabinet with one or more drawers. The household appliance can be, for example, a refrigerator, a dishwasher, an oven, or the like. The drawer can then be any type of extendable component. The term "drawer" should therefore be interpreted broadly.

[0011] In terms of design, it is simple if the linear drive has a linear motion element that is attached to the center rail at two mounting points spaced apart in the extension direction of the extension guide. The drive shaft and the linear motion element are coupled between these mounting points, so that when the drive shaft rotates, the linear motion element moves the center rail linearly in or against the extension direction, depending on the direction of rotation of the drive shaft. Attaching the linear motion element to the end regions of the center rail, and thus its essentially elongated and non-circumferential design, eliminates the need for additional components articulated to the center rail and circulating around it.

[0012] It may be expedient, following optional further development, to provide that the fastening areas on the center rail are spaced far apart in the extension direction and that the linear motion device is dimensioned accordingly so that it is possible to move the center rail linearly over half the extension path, whereby the synchronization device moves the guide rail twice as far as the center rail, so that the guide rail is electrically movable over the entire intended extension path.

[0013] In preferred optional embodiments, it can be advantageously provided that a friction-fit or positive-fit connection between the rotatable or rotating but otherwise stationary drive shaft and the linear motion element causes the linear motion element, together with the center rail, to move linearly when the drive shaft rotates. The invention has the advantage in that it can be implemented in a simple manner using various means for the drive shaft or the linear motion element.

[0014] In preferred optional embodiments, it may be advantageously provided that the drive shaft is designed as a driven friction wheel, a driven toothed belt pulley, a driven gear, or a driven pulley. Correspondingly, it may be provided that the linear motion element is designed as a friction belt, a toothed belt, a rack, or a cable.

[0015] To ensure particularly reliable operation, the synchronization device can further be designed with a synchronization gear – such as a wrap-around drive with a rope or belt, or a rack and pinion – and with the linear drive and the synchronization device each having separate, independent gear elements. Since the linear drive and the synchronization device thus do not share any gear elements such as wheels or rollers, nor a common linear motion element or wrap-around drive, mutual negative influence between the synchronization device and the drive unit during operation is effectively and reliably prevented. This also ensures easy retrofitting, maintenance, and replacement.

[0016] It can further be advantageously provided, according to an optional embodiment, that at least one leg, in particular a vertical leg, of one of the rails, in particular the center rail, lies between the fastening areas of the linear motion means on the center rail and the at least one gear element of the synchronization gear of the synchronization device, so that the linear motion means is safely separated from the gear element(s) of the synchronization device.

[0017] The decoupling of the synchronization device and the linear motion means is particularly advantageously promoted if at least one vertical leg of one of the rails, preferably the center rail, of the extension guide is arranged between the synchronization device and the linear motion means.

[0018] It may then be provided that the linear drive, in addition to the drive shaft and the actual linear motion element, has one or more deflection rollers, which can, for example, serve as tension rollers and which can further optimize the running characteristics.

[0019] It can then be advantageously optional for the electric motor to have a housing with a flat, disc-shaped contour. This housing can be attached to the cabinet rail in a simple, stable, and compact manner using a mounting plate, which may be designed as a mounting bracket. In particular, the housing can be fixed to the cabinet rail in the extension direction between the two mounting areas of the linear motion element on the center rail. This is advantageous compared to mounting the electric motor to the cabinet rail at one end, as suitable installation space is generally not available in this latter area. The mounting plate can be designed separately from the housing or as an integral part of it.The mounting plate, which can be designed as a mounting bracket, can be advantageously and compactly positioned between two mounting brackets for attaching the cabinet rail to the cabinet, particularly in the extension direction. According to a preferred embodiment, the drive unit housing can be mounted on the side of the mounting plate opposite the guide rollers, allowing the mounting plate to serve as bearings for the guide rollers and enabling the drive shaft to pass through the mounting plate, or allowing for additional support of the drive shaft within the mounting plate. This design also facilitates easy installation and replacement of the motor.

[0020] The flat, disc-like design can be implemented particularly well with an electric motor, either an internal or external rotor motor with a height between 8 mm and 15 mm. This offers especially advantageous options for space-saving and compact integration of the drive unit into drawer slides of various designs. A further advantage is that this reduces the complexity of the assembly or keeps it relatively simple. Noise is also minimized when a gearbox is omitted (direct drive).

[0021] This makes it easy to implement a design in which the housing is arranged on the drawer guide in such a way that, when assembled, it lies entirely or substantially below a drawer bottom.

[0022] It is easy to implement a design in which the housing is arranged on the drawer guide in such a way that, in the assembled state, it lies on a side of the drawer guide oriented towards the drawer, preferably such that, in the assembled state, its main sides lie parallel to a drawer bottom, or such that, in the assembled state, it lies between the cabinet wall and the rails of the drawer guide, wherein the main sides of the housing can be aligned parallel to a cabinet wall to which the drawer guide is attached.

[0023] In an optional embodiment, it can be further advantageous that the mounting plate and / or the housing project no more than 5 mm beyond one or more mounting sections for attaching the drawer slide to a cabinet in the horizontal and / or vertical direction, perpendicular to the extension direction. This ensures a particularly compact design. The mounting plate and the housing can thus preferably lie within a curve defined in the Y and Z directions by the maximum extent of the mounting sections, in particular mounting brackets, for attaching the drawer slide, and extending past the drive device in the X direction. In an optional embodiment, it can also be advantageous that the mounting plate is designed as a mounting bracket.Then, by appropriately dimensioning the legs of this mounting bracket, it can be ensured particularly easily that the drive device can lie within the defined envelope area.

[0024] Advantageously, the drive unit can be coupled with a control unit, or this unit can even be an integral part of the electric motor. This control unit can perform several functions, such as integration into a smart home system. For this purpose, the control unit can be designed to connect to other proprietary devices via various communication protocols and execute commands, for example, via voice or gesture control. Furthermore, the motor's control unit can be designed, either instead or additionally, to process motor parameters to provide additional functions. For example, it can determine the drawer's position, control its speed, or prevent collisions. Alternatively or additionally, the data acquisition can be used to draw conclusions about wear and tear and usage patterns.

[0025] In an application with multiple motors on different drawer slides, the control unit can also be used to synchronize the different drawer slides.

[0026] The moving parts (especially rollers) of the drive can be covered with a cover cap to prevent interference and / or damage and / or contamination.

[0027] The invention also provides a piece of furniture or a household appliance comprising a body, a part movable relative to it (for example, a furniture part), and one or two drawer slides according to one or more of the preceding claims, wherein the body rail(s) is / are attached to the body and the running rail^) is / are attached to the movable part. If the part is a drawer, preferably one of the drawer slides is attached to each side of the drawer, each adapted to the orientation of its respective side.

[0028] The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings. The invention is not limited to these exemplary embodiments. It is also not necessary to implement all of the features shown in combination in order to realize the invention. Furthermore, individual features of the following exemplary embodiments can also be advantageously combined with features of the other exemplary embodiments or of other parts of this description and the figures. The figures show:

[0029] Figs. 1a to 1f show several different views of a first extractor guide according to the invention with a drive device;

[0030] Figs. 2a to 2b: Fig. 2a shows a perspective view of a central rail of the extension guide from Fig. 1a with elements of the drive device arranged on it, and Fig. 2b shows an exploded view of the elements from Fig. 2a rotated by 90°;

[0031] Fig. 3 shows a top view of an extension guide of the type shown in Fig.

[0032] 1a-d and 2a-b without a running rail;

[0033] Figs. 4a to 4c show several different views of a second extension guide according to the invention with a drive device;

[0034] Fig. 5 shows a perspective view of the second extension guide according to the invention from Fig. 4, here without mounting brackets for attachment to a body, without mounting plate and electric motor;

[0035] Fig. 6 shows an exploded view of the elements from Fig. 5, including the mounting plate and electric motor;

[0036] Fig. 7 shows a top view of a central rail of the second extension guide according to the invention, including elements of the drive device and elements of a synchronization device;

[0037] Figs. 8a and 8b show different perspective views of the elements from Fig. 7; Figs. 9a to 9c show several different views of a third extension guide according to the invention with a drive device; and

[0038] Figs. 10a to d show different views of a piece of furniture with and without

[0039] Drawer.

[0040] Figures 1a to 1d disclose a first drawer slide 1. This drawer slide 1 has a body rail 2 and a running rail 3. The drawer slide 1 further comprises a center rail 4 (see in particular Figure 1d as well as Figures 2a, 2b and 3), which is arranged between the body rail 2 and the running rail 3, wherein sliding bearing devices, in particular rolling bearing devices (not shown in detail here), are arranged at least between the body rail 2 and the center rail 4 on the one hand and between the center rail 4 and the running rail 3 on the other.

[0041] These sliding bearing devices, in particular rolling bearing devices, are designed such that the rails 2, 3, and 4 are linearly displaceable relative to each other, allowing the drawer slide 1 to be extended and retracted. The drawer slide 1 accordingly has a fully extended state (Figs. 1e and 1f) and a fully retracted state (Figs. 1a to 1d) and can be moved back and forth between these two states. The drawer slide 1 is generally used in a piece of furniture 200 (see Figs. 10a to 10d) or a household appliance—as explained above—to enable the extension of a part, in particular a drawer 202, relative to a cabinet 201. For this purpose, the cabinet rail 2 can be attached to the cabinet and the running rail 3 to the drawer (the running rail 3 can therefore also be referred to as the drawer slide).The cabinet rail 2 can accordingly have at least one mounting section, for example a mounting bracket 21, by which it is preferably fixed to the cabinet. And the running rail 3 can have one or more fastening elements 31 by which it is fixed to the actual drawer.

[0042] The mounting section(s), in particular the mounting bracket(s) 21, can be formed integrally with the cabinet rail 2, as in the first embodiment shown in Figs. 1a to 1f. Alternatively, they can also be connected to it (see, for example, the second and third embodiments described below). In a Cartesian coordinate system, the extension direction of the drawer and that of the extension guide 1 is the X direction in Figs. 1 and 10a. The extension guide 1 is typically horizontally extendable. A corresponding drawer 201 (see Figs. 10a to 10c), on which the extension guide 1 could be arranged, would typically have a base 2011 oriented horizontally in the X / Y plane. The vertical direction would then be the Z direction. These directions X, Y, Z transform in space if the extension guide 1 is oriented differently.

[0043] The movement of rails 2, 3, and 4 is synchronized by a synchronization device 5 such that rails 3 and 4 move together in such a way that, when the drawer slide 1 is extended, retracted, or pushed in, the running rail 3 moves further, preferably twice as far, as the center rail 4, while the cabinet rail 2 remains stationary. The synchronization mechanism 5 can be designed in various ways, for example, as described in DE 10 2010 060 583 A1. However, it can also be designed in other ways, as long as it fulfills at least the function described above.

[0044] In a preferred embodiment, the synchronization device 5 comprises a wrap-around drive with a rope or belt or the like and two or more rollers (of which two rollers 51, 52 are visible in Fig. 2b and which are rotatably mounted on the central rail 4) and coupling means on the running rail 3 and on the body rail 2, wherein the wrap-around drive is designed such that when the extension guide 1 is pulled out, the running rail 3 is moved more or further, preferably twice as far, as the central rail 4, while the body rail 2 (in a state installed in a body 201) remains stationary.

[0045] The extension and retraction of the drawer slide 1 (including any fixed drawer) can be effected by means of an electric motor drive device 100. The drive device 100 can be fixed in place, preferably directly or indirectly, on the cabinet rail 2. It comprises an electric motor with a housing 101 and a drive shaft 102, which is coupled to a linear actuator 110 designed to convert rotary movements of the drive shaft 102 into linear movements of the center rail 4. The linear actuator 110 includes a linear motion element 111, which can be fixed in place at two mounting points 41, 42 of the center rail 4 spaced apart in the extension direction.

[0046] A friction-fit or positive-fit connection between the rotatable (or rotating during operation, but otherwise stationary) drive shaft 102 and the linear motion element 111 causes the linear motion element 111, along with the center rail 4, to move linearly when the drive shaft 102 rotates. This results in the center rail 4 being moved electrically, either in the extension direction X or against the extension direction X, depending on the direction of rotation of the electric motor or the drive shaft 102.

[0047] The mounting areas 41, 42 (which can also be considered mounting points in a coordinate system) of the linear motion device 111 on the center rail 4 are spaced apart from each other, and the linear motion device 111 can be dimensioned accordingly, such that it is possible to move the center rail 4 linearly by electric motor over half the extension travel of the guide rail 3. Since the center rail 4 is also coupled to the cabinet rail 2 and the guide rail 3 via the synchronization device 5 to ensure synchronous movement of the rails 3, 4, in which the guide rail 3 is moved further relative to the guide rail 2, preferably twice as far as the center rail 4, the guide rail 3 is thus driven by electric motor to move the entire intended extension travel.

[0048] The linear drive 110 and the synchronization device 5 do not share any common drive elements such as wheels or rollers, nor do they share a common linear motion element. Instead, they are separate from each other, each with its own drive elements mounted on the rails of the extension guide 1. Therefore, they cannot negatively influence each other. Furthermore, the design of the entire mechanism is simplified and made particularly reliable, as the synchronization and electromechanical drive functions are separated.

[0049] Preferably, the linear drive may include one or more—here two—deflection rollers 103, 104 in addition to the drive shaft 102 and the actual linear motion element 111. This optimizes the movement of the linear motion element 111. Preferably, the deflection rollers 103, 104 are spring-loaded and mounted in the Y-direction to keep the linear motion element 111 tensioned against the drive shaft 102. The linear motion element 111 can be attached to the mounting areas 41 and 42 in various ways. Clamps 411 and 412 are provided for this purpose. These are attached to the center rail 4. The linear motion element 111, here a belt or tape, can be clamped and, if necessary, additionally secured within them. The clamps 411, 412 can be made of metal or plastic, for example.They can have one or more folds so that they can be guided around an edge of the guide rail and enclose the belt, thus protecting it at these points (see, for example, Fig. 1b and 2b).

[0050] The drive shaft 102 can be designed as a drive wheel that interacts with the linear motion element 111 in a form-fit and / or force-fit manner.

[0051] For this purpose, the drive shaft 102 is preferably profiled on its outer circumference in such a way as to correspond to the linear motion means 111, so that the linear motion means 111 is guided particularly securely on this outer circumference.

[0052] The drive shaft 102, which is designed as a wheel or has one, can, for example, have teeth on its outer circumference if the linear motion element 111 has corresponding teeth. It can, in particular, be designed as a toothed belt pulley, a gear, a friction wheel, or a pulley.

[0053] The linear motion device 111 can be designed, for example, as a toothed belt, rack and pinion, friction belt, or cable, in particular as a pull cable. The essential feature is the conversion of the rotary motion of the drive shaft 102 into a linear motion of the linear motion device 111, which results in a linear motion of the center rail 4 attached to it.

[0054] According to a preferred embodiment, this can be achieved as follows.

[0055] The drive device 100 includes the electric motor, which has the housing 101, from which the drive shaft 102 (here in the sense of a drive pin with a wheel fixed to it in a rotationally fixed manner) protrudes.

[0056] The torque of the electric motor is tapped via the drive shaft 102, which is coupled to the linear motion element 111. In this way, the necessary translational movement of the extension guide 1 can be generated from the rotary motion of the electric motor within a relatively flat, compact installation space. Position measurement can be performed, as an option, by determining the angle of rotation, for example, at the drive shaft 102 or at one of the optional deflection rollers 103, 104, and / or, as another option, directly from one or more parameters of the electric motor, and / or, as yet another option, from control parameters of the electric motor.

[0057] The housing 101 can be designed to be relatively flat, so that it has two opposing main sides 1011, 1012 and several narrow sides 1013. It thus has a disc-shaped contour, as defined in this document. An internal rotor motor is preferably used as the electric motor, which facilitates this compact design and enables simple power transmission via the drive shaft 102. Here, the main sides 1011, 1012 are designed to be almost rectangular and are aligned in the X,Y plane or parallel thereto, while the narrow sides 1013 extend in the Z direction.

[0058] Furthermore, according to the design shown in Figs. 1a to 1f and 2a and 2b, the housing 101 is arranged on the side (in the Y direction) of the guide rail 3 facing away from the mounting bracket 21 of the extension guide 1.

[0059] The housing 101 can be fixed to the cabinet rail 2 by means of an angled mounting plate 105. Here, this is implemented such that the mounting plate 105 is designed as a mounting bracket. This mounting bracket can be fixed to one of the main sides 1011, 1012 of the housing 101 (here, on top of it) or be integrally formed with one of the main sides 1011, 1012. Alternatively, it can be fixed to the cabinet rail 2, here on the underside of the cabinet rail 2 (Fig. 1d). For fastening, mounting tabs are suitable, which can be made of the same material as the mounting plate 105 and engage in recesses on the cabinet rail 2.

[0060] The drive device 100 and in particular the housing 101 can be arranged according to the preferred embodiment of Figs. 1a to 1f and 2a to 2b such that it lies virtually inside the furniture towards the extension guide 1 and below the (not shown here) drawer bottom 2021 of the drawer 202 (see in particular Figs. 1d, 1f and 10a to 10d for this arrangement).

[0061] It may also be provided that the entire drive device

[0062] 100 in relation to the Z-direction, not at all, and only very slightly, e.g., by only less than

[0063] The drive unit 100 projects 5 mm downwards (see Fig. 1d) beyond the lower edge of the cabinet rail 2 and upwards beyond the upper edge of the running rail 3 (see Fig. 1d and the dashed lines shown therein). In this way, the drive unit 100 is accommodated in a surprisingly space-saving manner on the drawer guide 1 and within the furniture. Space envelopes can be easily defined on the drawer guide 1 and on the furniture within which the drive unit 100 can be housed.

[0064] From the upper main surface 1011 of the housing 101, which is oriented in the Z-direction and can also be part of the mounting plate 105 or on which the mounting plate 105 is placed, a drive shaft of the electric motor can project upwards (again in the Z-direction). A drive wheel is arranged on this drive shaft, forming the driven drive shaft 102. Accordingly, in one embodiment, the drive shaft 102 can penetrate the mounting plate 105.

[0065] Rotatable guide rollers 103, 104 can also be arranged on the housing 101 and / or the mounting plate 105. The two guide rollers 103, 104 can have the same diameter and a smaller diameter compared to the drive shaft wheel. They can optimize the movement of the linear motion element 111 and can optionally also be designed as tension rollers for a belt-type linear motion element 111.

[0066] The torque of the electric motor is derived via the drive shaft 102, which is coupled to the linear motion element 111. In this way, the necessary translational movement of the drawer slide 1 can result from the rotary motion of the electric motor within a relatively flat, compact installation space. The individual rails or the corresponding profiles of the drawer slide 1 are preferably synchronized by means of a wire rope synchronization device 5.

[0067] The two deflection rollers 103, 104 can further be offset in the X direction on the drive device 101, whereby the distance to the center rail 4 in the Y direction can be the same. The drive shaft 102 can preferably have a position in the X direction that lies between the X coordinates of the two deflection rollers 103, 104, but can be located further away from the center rail 4 in the Y direction than the two deflection rollers 103, 104.

[0068] In a possible preferred embodiment, the linear motion means 111 is guided around the two deflection rollers 103, 104 at the outer circumferential areas pointing towards the central rail 4, is guided between these rollers and placed around the drive shaft 102.

[0069] In plan view, the linear motion means 111 encircles the drive wheel 103, 104 by approximately 160° to 220° (here by approximately 200°), and then runs essentially in the Y direction towards the two mounting areas 41, 42 and thus the two clamps 411, 421 (see Fig. 2a and b).

[0070] The linear motion device 111 can advantageously be arranged on the side of the mounting plate 105 facing away from the actual electric motor.

[0071] This ensures a compact design with defined, safe guidance of the linear motion element 111.

[0072] For control or regulation, the electric motor can be connected to a control device 120 via a connection 121 (wired or wireless), or the control device can be installed in the housing 105. The control device 120 preferably has a microprocessor and a memory on which a control program can be stored. Furthermore, the control device 120 can be coupled to an input and / or output device (not shown here), either on the furniture or at another location (e.g., remote control, mobile phone, buttons or control panel on the furniture, integration into a smart home control system, into the environment of a service robot, gesture control device, possibility of networking with other end devices, etc.).

[0073] Because the drive unit 100 is stationary and attached to the cabinet rail 2, it is easy to provide power to the electric motor, e.g., via cable or other means (e.g., inductive charging or DLG). This avoids any mechanical stress on cables. The use of a (replaceable) energy storage device is also conceivable.

[0074] When the electric motor is started, the linear motion element 104 can be moved in the directions +X and -X by rotating the drive shaft 102, depending on the direction of rotation. This moves the center rail 4 in these directions, whereby the guide rail 3 is also extended and retracted at approximately twice the speed via the synchronization device 5, thus moving the drawer 202 connected to the guide rail 3 in the installed state. Figures 4a to 4c show a second extension guide 1 and figures 9a to 9c show a third extension guide 1.

[0075] These drawer slides 1 each also have a cabinet rail 2 and a running rail 3. These drawer slides 1 also further comprise a center rail 4, which is arranged between the cabinet rail 2 and the running rail 3, wherein sliding bearing devices, in particular rolling bearing devices (not shown in detail here), are arranged at least between the cabinet rail 2 and the center rail 4 on the one hand and between the center rail 4 and the running rail 3 on the other.

[0076] The linear drive 110 also provided here again includes in particular the linear motion means 111, which can be fixed in place on the two fastening areas 41, 42 of the center rail 4 which are spaced apart in the extension direction.

[0077] A friction-fit or positive-fit connection between the rotatable (or rotating during operation, but otherwise stationary) drive shaft 102 and the linear motion element 111 causes the linear motion element 111, along with the center rail 4, to move linearly when the drive shaft 102 rotates. This causes the center rail 4 to be moved electrically, either in the extension direction X or against the extension direction X, depending on the direction of rotation of the electric motor or the drive shaft 102. Two deflection rollers 103, 104 are again provided for this purpose. The preferred belt, as one of the possible linear motion elements 111, as well as the drive shaft 102 and the two deflection rollers 103, 104, can be oriented essentially perpendicular to the functionally equivalent elements of the first embodiment.

[0078] In the illustrated embodiments, the deflection rollers 103, 104 could also each be spring-loaded to ensure tension on the linear motion means 111.

[0079] The mounting areas 41 and 42 on the center rail 4 are again spaced apart from each other in the extension direction X, and the linear motion device 101 is dimensioned accordingly such that it is possible to move the center rail 4 linearly over half its extension path. The synchronization device 5 moves the guide rail 3 twice as far as the center rail 4, so that the guide rail 3 is electrically driven and movable over its entire intended extension path. The linear drive 110 and the synchronization device 5 again do not share any wheels or rollers, nor do they share a linear motion device.

[0080] The drawer guides 1 of the second and third embodiments are generally relatively narrow in the Y direction, with the three rails 2, 3, 4 lying essentially vertically on top of each other, with the middle rail 4 also being able to engage in the cabinet rail 2 on one side and in the running rail 3 on the other.

[0081] Furthermore, one or more mounting brackets 21 – for example, two – are attached to the cabinet rail 2 as mounting sections and are firmly connected to it. Each mounting bracket 21 can have a horizontal web 211 and a vertical web 212. The cabinet rail 2 can be fixed to the horizontal web 211. The vertical web 212 can be used to fix the cabinet rail 2 to the cabinet 201.

[0082] The two (or possibly two of three or more) mounting brackets 21 shown here are offset from each other in the X direction and preferably spaced apart. In the X-coordinate region between these two mounting brackets 21, the housing 101 of the drive device 100 and its mounting plate 105 are arranged on the cabinet rail 2. They then extend a certain distance in the X direction and horizontally and vertically perpendicular to it in the Y and Z directions.

[0083] In an optional embodiment, the angled mounting plate 105 may not project at all (third embodiment) or at least by less than 5 mm (second embodiment) beyond the mounting brackets 21 for attaching the drawer slide 1 to the body 201 in the horizontal Y-direction and / or in the vertical Z-direction, perpendicular to the extension direction. This ensures a particularly compact design, and especially in the third embodiment, a recess for engagement of the mounting plate 105 or the drive device 100 is generally not required in the body 201. The mounting plate 105 and the housing 101, or even the entire drive device 100, can thus preferably lie virtually within an envelope of the drawer slide 1, which is defined in the Y- and Z-directions by the respective maximum extension of the mounting sections.Mounting bracket 21 is defined for attaching the extension guide 1 and extends past the drive device 100 in the X direction. The housing 101, in turn, has a substantially disc-shaped or relatively flat structure. The main sides 1011, 1012 of the housing extend in or parallel to the X / Z plane. Mounting plate 105 is provided for securing the housing 101. This plate can also be designed as a mounting bracket. The mounting bracket 105 can have a horizontal crossbar 1051 and a vertical web 1052.

[0084] The housing 101 can then be arranged essentially with its main sides 1011, 1012 parallel to a wall of a carcass 201 and to a side rail of the drawer between them. It can also be arranged between the carcass 201 and between the superimposed rails 2, 3, 4.

[0085] If necessary, the installation space for the drive device 100 can be easily adjusted by adjusting the length of the horizontal webs 211 of the mounting sections 21.

[0086] Thus, the extension of the horizontal web 211 in the Y-direction differs between the second and third embodiments, which are otherwise identical. This makes it possible to position the housing 101 in such a way that it does not project beyond the mounting bracket 21 in the transverse direction (here Y), which can simplify its attachment to the body 201 (see in particular Fig. 9c).

[0087] In a preferred embodiment, the drive device 100 and the linear drive 110 can be located essentially between the rails 2, 3, 4 and the vertical webs 211 of the mounting sections 21, and the synchronization device 5 can be located essentially on the opposite side of the quasi-vertically superimposed rails 2, 3, and 4, i.e., on the side of the drawer slide 1 that typically faces the drawer. The synchronization device 5 and the drive device 100 with the linear drive 110 each engage the center rail 4. However, apart from this engagement, they do not have any common drive elements and are separated by at least one vertical leg of the center rail 4.The axes of rotation of the deflection rollers 103, 104 (which may preferably form tension rollers) and the drive shaft 102 can be aligned, wherein the linear motion means 111 can be guided a section around the circumference of the drive shaft 102, which is arranged centrally relative to the deflection rollers 103, 104, and around each of the deflection rollers 103, 104.

[0088] In the second and third embodiments, it can optionally be provided that the linear motion element 111, here again a band or belt, is fastened in the fastening areas 41, 42 by means of shaped elements 412, 422, which are fixed to a vertical central web of the center rail 4 and project laterally from a gap between the body rail 2 and the guide rail 3 in the direction of the housing 101 (see in particular Fig. 9c). The drive shaft 102 and one or more deflection rollers 103, 104 are preferably provided there. Otherwise, the operating principle of the second and third embodiments corresponds to that of the first embodiment.

[0089] Reference symbol list

[0090] Extraction guide 1

[0091] Cabinet rail 2

[0092] Mounting bracket 21 horizontal web 211 vertical web 212

[0093] Drawer slide 3

[0094] Fasteners 31

[0095] Middle rail 4

[0096] Mounting areas 41, 42

[0097] brackets 411, 421

[0098] Form elements 412, 422

[0099] Synchronization device 5 rollers 51, 52

[0100] Drive device 100

[0101] Case 101

[0102] Main pages 1011, 1012

[0103] Narrow sides 1013

[0104] Drive shaft 102

[0105] Pulleys 103, 104

[0106] Mounting plate 105

[0107] Crossbar 1051

[0108] Vertical bridge 1052.

[0109] Linear drive 110

[0110] Linear motion devices 111

[0111] Control unit 120

[0112] Connecting route 121

[0113] Furniture 200

[0114] Corpus 201

[0115] Drawer 202

[0116] Soil 2021

[0117] Directions X, Y, Z

Claims

Claims 1. Extraction procedure (1) comprising: - a cabinet rail (2) that can be attached to the body of a piece of furniture (200) or a household appliance, a running rail (3) that can be attached to a movable part and a center rail (4) that is arranged between the cabinet rail (2) and the running rail (3), wherein sliding bearing devices, in particular roller bearing devices, are also provided in each case, so that the extension guide (1) can be extended and retracted, - a synchronization device (5) with which the movement of the center rail (4) and the guide rail (3) relative to the cabinet rail (2) is synchronized such that the guide rail (3) is moved further, preferably twice as far as the center rail (4), when the drawer slide (1) is extended, retracted, or pushed in, while the cabinet rail (2) remains stationary, and - a drive device (100) for electrically extending and retracting the extension guide (1), which is coupled to the center rail (4) and has an electric motor with a housing (101) and a drive shaft (102), characterized in that - the electromechanical drive device (100) is fixed in place on the cabinet rail (2), and that the drive shaft (102) is coupled to a linear drive (110) which is designed to convert rotary movements of the drive shaft (102) into linear movements of the center rail (4), and - the electromechanical drive device (100) and the synchronization device (5) are formed separately from each other on the rails of the extension guide (1 ).

2. Extension guide (1) according to claim 1, characterized in that the linear drive (101) has a linear motion means (111) which is attached to the center rail (4) at two mounting areas (41, 42) spaced apart in an extension direction (X) of the extension guide (1), and that the drive shaft (102) and the linear motion means (111) are coupled to each other between these mounting areas, so that when the drive shaft (102) rotates, the linear motion means (111 ) depending on the direction of rotation of the drive shaft (102) the center rail (4) is moved linearly in or against the extension direction (X).

3. Extension guide (1) according to claim 2, characterized in that the fastening areas (41, 42) on the center rail (4) are spaced apart from each other in the extension direction (X) and that the linear motion means (111) is dimensioned accordingly such that it is possible to move the center rail (4) linearly over half the extension path, wherein the synchronization device (5) moves the guide rail (3) twice as far as the center rail (4), so that the guide rail (3) is electrically driven and can be moved electrically over the entire intended extension path.

4. Extension guide (1 ) according to claim 2 or 3, characterized in that a force-locking connection or a form-locking connection between the rotatable or rotating in operation but otherwise stationary drive shaft (102) and the linear motion means (111 ) causes the linear motion means (111 ) together with the center rail (4) to move linearly when the drive shaft (102) is rotated.

5. Extraction guide (1 ) according to claim 4, characterized in that the drive shaft (102) is designed or has a driven friction wheel, a driven toothed belt wheel, a driven gear or a driven pulley.

6. Extension guide (1 ) according to claim 4 or 5, characterized in that the linear motion means (111 ) is designed as a belt, in particular a flat belt or a strap, or as a rack or as a rope.

7. Extraction guide (1) according to one of the preceding claims, characterized in that the synchronization device (5) has a synchronization gear.

8. Extension guide (1) according to one of the preceding claims, characterized in that the linear drive (110) and the synchronization device (5) each have separate gear elements.

9. Extension guide (1 ) according to one of the preceding claims, characterized in that at least one leg, preferably a vertical leg, of one of the rails, preferably the center rail (4), of the extension guide (1 ) is arranged between the synchronization device (5) and the linear motion means (111 ).

10. Extension guide (1 ) according to one of the preceding claims, characterized in that the linear drive (110) has, in addition to the drive shaft (102) and the actual linear motion means (111 ), one or more deflection rollers (103, 104).

11. Extraction guide (1) according to one of the preceding claims, characterized in that the electric motor has a housing (101) which has a flat, disc-shaped contour, the thickness of which is preferably between 8 and 15 mm.

12. Drawer guide (1 ) according to one of the preceding claims, characterized in that the housing (101 ) is fixed to the body rail (2) by means of a mounting plate (105), in particular designed to be substantially flat or angled.

13. Extraction guide (1 ) according to one of the preceding claims, characterized in that the electric motor of the drive device (100) is designed as an internal or external rotor motor.

14. Drawer guide (1 ) according to one of the preceding claims, characterized in that the housing (101 ) is arranged on the drawer guide (1 ) such that, in the assembled state, it lies entirely or substantially below a drawer bottom in the furniture.

15. Drawer guide (1 ) according to one of the preceding claims, characterized in that the housing (101 ) is arranged on the drawer guide (1 ) such that, in the assembled state, it lies on a side of the rails (2, 3, 4) of the drawer guide (1 ) facing away from the body (201 ) towards the drawer.

16. Extension guide (1) according to claim 15, characterized in that the housing (101) is arranged on the extension guide (1) such that the The main sides (1011 , 1012) of the housing (101 ) lie parallel to a body wall in the assembled state, to which the respective drawer guide (1 ) is attached.

17. Drawer guide (1 ) according to claim 15, characterized in that the housing (101 ) is arranged on the drawer guide (1 ) such that in the assembled state it lies between the cabinet wall and the rails (2, 3, 4) of the drawer guide (1 ).

18. Drawer guide (1 ) according to one of the preceding claims, characterized in that the housing (101 ) with the mounting plate (105) is fixed between two mounting brackets (21 ) for attaching the cabinet rail (2) to the cabinet (201 ) on the cabinet rail (2).

19. Drawer guide (1 ) according to one of the preceding claims, characterized in that the mounting plate (105) does not project, or projects, beyond one or more mounting sections, in particular mounting brackets (21 ) for attaching the drawer guide (1 ) to the body (201 ) in the horizontal direction and / or in the vertical direction (Y, Z) transversely to the extension direction (X) by less than 5 mm.

20. Extension guide (1 ) according to one of the preceding claims, characterized in that the drive device (100) is coupled to a control device (120).

21. Furniture or household appliance comprising a body, a part movable relative to it, in particular a pull-out drawer, and comprising one or two pull-out guides (1) according to one or more of the preceding claims, wherein the body rail(s) is / are attached to the body (201) and the running rail(s) is / are attached to the movable part.

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