Device for a seat and seat

Abstract

The invention relates to a device (6) for a piece of seating furniture (2), comprising a base frame (10) for attaching the device (6) to an underside of a seat part (4) of the seating furniture (2), a leg rest (8), and an adjustment device (14) comprising an electric motor (12) for attaching the leg rest (8) to the base frame (10) and for electrically moving the leg rest (8) from a rest position to a working position and vice versa, wherein the leg rest (8) is arranged completely below the seat part (4) in the rest position and completely in front of the seat part (4) in the working position, and wherein the adjustment device (14) has at least one actuating arm (18) having a roller (16) at its free end and two guide ramps (20, 22) for force-transmitting guidance of the respective roller (16), wherein the at least one actuating arm (18) with the roller (16) and the corresponding guide ramps (20, 22)22) are designed and arranged in such a way that the roller (16) is in force-transmitting contact with one of the two guide ramps (20, 22) only at the beginning and end of the respective movement when the leg support (8) is moved from the rest position to the operating position and vice versa, and is otherwise without any force-transmitting guidance. Furthermore, the invention relates to a piece of seating furniture (2).

Description

[0001] The invention relates to a device for a piece of seating furniture, comprising a base frame for attaching the device to an underside of a seat part of the seating furniture, a leg rest for supporting the legs of a user of the seating furniture, and an adjustment device comprising an electric motor for attaching the leg rest to the base frame and for electrically moving the leg rest from a rest position to a working position and vice versa, wherein the leg rest is arranged completely below the seat part in the rest position and completely in front of the seat part in the working position, and wherein the adjustment device has at least one actuating arm having a roller at its free end and two guide ramps for force-transmitting guidance of the respective roller.

[0002] Furthermore, the invention relates to a piece of seating furniture with such a device.

[0003] Such devices for seating furniture and seating furniture equipped with them are already known from the prior art in a multitude of different embodiments.The known devices for seating furniture are designed to provide foot support to a user of the seating furniture and comprise a base frame for attaching the device to an underside of a seat part of the seating furniture, a leg rest for supporting the legs of a user of the seating furniture, and an adjustment device comprising an electric motor for attaching the leg rest to the base frame and for electrically moving the leg rest from a rest position to a working position and vice versa, wherein the leg rest is arranged completely below the seat part in the rest position and completely in front of the seat part in the working position, and wherein the adjustment device has at least one actuating arm having a roller at its free end and two guide ramps for force-transmitting guidance of the respective roller.

[0004] The object of the present invention is to improve a device for a piece of seating furniture and a piece of seating furniture.

[0005] To solve this problem, the invention, in conjunction with the preamble of claim 1, is characterized in that the at least one actuating arm with the roller and the corresponding guide ramps are designed and arranged in such a way that, when the leg rest is moved from the rest position to the operating position and vice versa, the roller is only in force-transmitting contact with one of the two guide ramps at the beginning and end of each movement and is otherwise without any force-transmitting guidance. Furthermore, this problem is solved by a piece of seating furniture with the features of claim 12.

[0006] The particular advantage of the invention lies in the fact that both a device for a seat and the seat itself are improved. Due to the inventive design of the device and the seat, it is possible to achieve very good guidance when transferring the leg rest between the resting position and the operating position, even with a structurally and manufacturing-wise simplified design of the device. Accordingly, the material requirements and the weight of the device according to the invention are reduced compared to the prior art.Despite the aforementioned reduction in design, the leg rest can be reliably moved back and forth. The leg rest is guided by at least one operating arm with a roller and corresponding guide ramps only when stowed beneath the seat of the furniture and when finally positioned in front of the seat. Accordingly, the leg rest can be stored largely invisibly beneath the seat in its resting position and positioned completely in front of the seat in its use position, for example, at a height essentially the same as the seat surface.

[0007] In principle, the device according to the invention and the seating furniture according to the invention equipped with it can be freely selected within wide suitable limits with regard to type, function, material and dimensions.

[0008] A particularly advantageous embodiment of the device according to the invention provides that the at least one actuating arm is movably arranged on a retaining linkage of the adjustment device for holding the leg support such that the actuating arm with the roller is, on the one hand, movable in engagement with the respective guide ramp following a contour of this guide ramp and can be held in both the rest and operating positions, and, on the other hand, is held on the retaining linkage by gravity by means of a stopping device of the retaining linkage, preferably that the stopping device is designed as a stop bolt of the retaining linkage. In this way, the device according to the invention can be implemented in a particularly simple manner from a design and manufacturing perspective. This applies in particular to the especially preferred embodiment of this embodiment.

[0009] A further advantageous embodiment of the device according to the invention provides that the base frame is designed in a frame-like manner, preferably that the base frame has two side parts, each designed as a U-profile, and particularly preferably that the adjustment mechanism is arranged at least partially within the U-profiles. This significantly improves the stability of the adjustment mechanism and thus of the seating furniture according to the invention, while simultaneously resulting in only a minimal increase in material and therefore weight. Furthermore, the combination of the U-profiles with the adjustment mechanism results in a simple yet highly reliable, robust, and space-saving design of the invention.Accordingly, the space available below the seat of the seating furniture can be used to a large extent for storing the leg rest in its resting position, so that the leg rest can be arranged essentially invisibly below the seat in its resting position.

[0010] Another advantageous embodiment of the device according to the invention provides that the electric motor is fixedly arranged at a rear end of the seating furniture on the base frame, preferably that the electric motor is arranged essentially centrally between two sides of the base frame. In this way, the space available below the seat of the seating furniture can also be used to a large extent for storing the leg rest in its resting position, so that the leg rest can be arranged essentially invisibly below the seat in its resting position. Accordingly, the combination of this embodiment with the particularly preferred embodiment of the aforementioned embodiment results in a very advantageous spatial situation below the seat of the seating furniture according to the invention for storing the leg rest in its resting position.The single electric motor of the adjustment device, due to its stationary position, does not need to move along with the leg rest as is usually the case. This allows for either greater stability of the device according to the invention compared to the prior art, or, with comparable stability, a less material-intensive and / or more space-saving design. Furthermore, the essentially central positioning of the single electric motor in the preferred embodiment of this further development ensures that unwanted torque input into the device according to the invention due to this electric motor is easily avoided. Moreover, the aforementioned advantages can be realized in a very simple and robust manner from a design and manufacturing perspective using the invention.

[0011] A further advantageous embodiment of the device according to the invention provides that the electric motor is connected to a residual element of the adjusting device, which has at least one actuating arm, by means of at least one drive rod in a torque-transmitting manner. Preferably, the drive rod is designed as a polygonal rod, and particularly preferably, the polygonal rod is designed as a hexagonal rod. This enables a structurally reduced and robust implementation of the adjusting device and thus of the device according to the invention. This applies particularly to the preferred and especially to the particularly preferred embodiment of this embodiment. In this context, it is very advantageous if the at least one drive rod is designed as a single drive rod.

[0012] An advantageous further development of the aforementioned further development of the device according to the invention provides that the aforementioned remaining part of the adjusting device has two bevel gears, wherein the bevel gears are each connected to the electric motor on the drive side in a torque-transmitting manner and to a spindle on the output side in a torque-transmitting manner, and wherein each spindle interacts force-transmittingly with a spindle nut corresponding to this spindle and mechanically connected to a retaining linkage having at least one actuating arm for holding the leg support. In this way, a very reliable gear technology for redirecting a torque by 90° is provided, which is available on the market in many embodiments. For example, reference is made here to bevel gears designed as bevel gears.On the other hand, the combination of the respective angle gear on one side and the corresponding spindle with the respective spindle nut on the other side provides a very simple implementation of this torque redirection, both in terms of design and manufacturing technology.

[0013] An advantageous embodiment of the device according to claim 6 or 7, referring back to claim 3, provides that the respective spindle is arranged in the U-profile of the device extending along the spindle axis, and the respective spindle nut, or the respective spindle nut and guide sleeve, is / are guided in the corresponding U-profile perpendicular to and / or along the spindle axis with essentially no play. This significantly improves the stability of the adjustment mechanism and thus of the device according to the invention, on the one hand, by means of the U-profiles, while simultaneously resulting in only a minimal increase in material and therefore weight. On the other hand, the combination of the U-profiles with the respective spindle nut provides a simple yet very reliable and robust transverse guidance of the spindle nut to and / or longitudinal guidance of the spindle nut along the spindle axis during movement of the leg support.

[0014] An advantageous embodiment of the device according to any one of claims 6 to 8, referring back to claim 3, provides that the respective spindle nut is designed to compensate for tolerances perpendicular to a spindle axis and / or along the spindle axis, preferably that the respective spindle nut is biconvex along the spindle axis. This ensures that the respective spindle nut is guided reliably in the corresponding U-profile, i.e., without tilting or the like, despite unavoidable component and assembly tolerances perpendicular to the spindle axis and / or along the spindle axis. This applies particularly to the preferred embodiment of this embodiment.Due to the aforementioned biconvex design of the respective spindle nut, i.e., a spindle nut with a convex shape along the spindle axis, a close, force-transmitting contact is achieved between the spindle nut and the corresponding U-profile, thus compensating for any play between the spindle on one side and the spindle nut on the other. This also applies in particular to a reversal of the spindle nut's movement, i.e., when switching from a movement of the leg support towards the operating position to a movement towards the resting position and vice versa.

[0015] An advantageous further development of the latter embodiment of the device according to the invention provides that the respective spindle nut is designed to be reversibly deformable perpendicular to and / or along the spindle axis, preferably that the respective spindle nut has a slot on both sides, and particularly preferably that the slot extends along the spindle axis. This makes the respective spindle nut particularly suitable for the present application. This applies especially to the preferred embodiment of this further development, by means of which the respective spindle nut can be implemented in a particularly simple manner from a design and manufacturing perspective.The particularly preferred embodiment of this further development is especially suitable for the application because it enables the very important compensation of the play between the respective spindle and the corresponding spindle nut along the spindle axis in a simple and reliable manner.

[0016] Further advantages, features, and details of the invention can be found in the dependent claims and the following description. Features mentioned therein can be essential to the invention individually or in any combination. The drawings serve only as examples to clarify the invention and are not intended to be limiting.

[0017] They show: Fig. 1 shows an embodiment of the seating furniture according to the invention with the device according to the invention, with the leg rest in the rest position; Fig. 2 shows an embodiment in analogous representation to the Fig. 1 , with the leg rest in the operating position, Fig. 2b the embodiment according to the Fig. 2a in a perspective bottom view, Fig. 3a, b the embodiment in five sectioned side views, during the transfer of the leg support from the rest position to the operating position, Fig. 3c the embodiment according to the middle illustration in the Fig. 3a , with a detailed view in the area of ​​one of the rollers, Fig. 4adie the device of the exemplary embodiment with the leg support in the rest position, with a lateral sectional view in the area of ​​one of the rollers, Fig. 4b the device according to Fig. 4a in a perspective view, Fig. 4c the device in analogous representation to Fig. 4b , without leg rest, Fig. 4d the device in analogous representation to the Fig. 4c , in a partially enlarged view and in a partially exploded view, Fig. 5 the device in analogous representation to the Fig. 4a , with the leg rest in the operating position, Fig. 5b the device in analogous representation to Fig. 4b , with the leg rest in the operating position, additionally with a detailed view, Fig. 6 one of the spindle nuts of the exemplary embodiment in four corresponding views and Fig. 7 one of the guide sleeves of the exemplary embodiment in four views corresponding to the Fig. 6 analog representations.

[0018] In the Fig. 1 bis 7 An embodiment of the seating furniture according to the invention, including a device according to the invention, is shown purely by way of example.

[0019] The seating furniture 2 is designed as an armchair and comprises a seat 4 for a user (not shown) to sit on and a device 6 associated with the seat 4, including a leg rest 8 for supporting the user's feet. The term "foot-side" is to be interpreted broadly and, according to the invention, includes both support for the user's feet only and support for both the user's feet and legs, as is the case in the present embodiment. See the Fig. 1 bis 2b in a summary.

[0020] The device 6 for the seating furniture 2 further comprises a base frame 10 for attaching the device 6 to an underside of the seat part 4 of the seating furniture 2 and an adjustment device 14 comprising an electric motor 12 for attaching the leg rest 8 to the base frame 10 and for electrically transferring the leg rest 8 from, for example, a position in the Fig. 1 and 4a bis 4d depicted resting position in, for example, the Fig. 2a , 2b , 5a and 5b The device has two operating positions, one in the depicted position and vice versa, wherein the leg rest 8 is arranged completely below the seat part 4 in the rest position and completely in front of the seat part 4 in the operating position, and wherein the adjusting device 14 has a total of two actuating arms 18, each with a roller 16 at its free end, and two guide ramps 20, 22 assigned to each roller 16 for force transmission. See, for example, the Fig. 3a bis 3c , which in a combined view show the seating furniture 2 during the transfer of the leg rest 8 from the resting position, in the image plane of the Fig. 3a above, over several intermediate layers, in the image plane of the Fig. 3a center and bottom as well as in the image plane of the Fig. 3b above, up to the operating position, in the image plane of the Fig. 3b The transition of the leg rest 8 from the operating position to the resting position is carried out in reverse order. Each transition is stepless. However, embodiments of the invention are also conceivable in which the transition from the resting position to the operating position and vice versa can be carried out in stages. Accordingly, the at least one intermediate layer can also serve as a support for the feet and / or legs of the user of the seating furniture according to the invention.

[0021] According to the invention, the two actuating arms 18 with their respective rollers 16 and the corresponding guide ramps 20, 22 are designed and arranged in such a way that, when moving the leg support 8 from the rest position to the operating position and vice versa, the respective roller 16 is only in force-transmitting contact with one of the two corresponding guide ramps 20, 22 at the beginning and end of the respective movement and is otherwise without any force-transmitting guidance. See in particular the illustration in the plane of the Fig. 5a Section BB shown above illustrates the path of movement of the roller 16 depicted therein by means of a dashed line. Between the two guide ramps 20, 22 corresponding to this roller 16, the roller 16 moves along the aforementioned path without force-transmitting contact and thus without any guidance; instead, the roller 16 is merely moved along with the corresponding actuating arm 18 without itself exerting any force on this actuating arm 18. The above statements also apply accordingly to the actuating arm 18 (not shown) with its roller 16 and the corresponding guide ramps 20, 22. The same applies to the further statements in which only a part of the entire mechanism is shown in figures and / or described in text, since the two sides of the device 6 are mirror images of each other.

[0022] The respective actuating arm 18 is movably arranged on a retaining linkage 24 of the adjusting device 14 for holding the leg support 8 such that the respective actuating arm 18 with the roller 16 is movable on the one hand in engagement with the respective guide slope 20, 22 following a contour of this guide slope 20, 22 and can be held in the rest position and operating position respectively, and on the other hand is held on the retaining linkage 24 by gravity by means of a stop device of the retaining linkage 24, namely in such a way that the stop device is designed here as a stop bolt 26 of the retaining linkage 24.

[0023] In the present embodiment, the base frame 10 is designed as a frame, with the base frame 10 having two side parts 28, 30, each designed as a U-profile, such that the adjustment device 14 is arranged at least partially within the U-profiles 28, 30. See, for example, the Fig. 4a bis 4d .

[0024] The electric motor 12 is fixedly mounted at the rear end of the seat 2 on the base frame 10, positioned essentially centrally between two sides of the base frame 10, namely between the two U-profiles 28 and 30. Furthermore, the electric motor 12 is connected to a portion of the adjustment device 6, which includes the two actuating arms 18, by means of at least one drive rod 32, transmitting torque. The drive rod 32 is designed as a polygonal rod, specifically a hexagonal rod. With a suitable selection of the electric motor, the drive rod can be configured as a single drive rod.

[0025] The aforementioned remainder of the adjusting device 6 comprises two bevel gears 34, 36, wherein the bevel gears 34, 36 are each connected on the drive side to the electric motor 12 in a torque-transmitting manner and on the output side to a spindle 38, 40 in a torque-transmitting manner, and wherein each spindle 38, 40 interacts in a force-transmitting manner with a spindle nut 42, 44 corresponding to this spindle 38, 40 and mechanically connected to the retaining linkage 24, which has the two actuating arms 18, for holding the leg support 8. See in particular the Fig. 4a bis 5b In summary, the two angle gears 34, 36 are largely made of plastic parts and each is designed as a bevel gear bearing.

[0026] The adjusting device 14 further comprises, in addition to the spindle nuts 42, 44, two guide sleeves 46, 48, each longitudinally guided by the corresponding spindle 38, 40, wherein the two guide sleeves 46, 48 are also mechanically connected to the retaining linkage 24, and wherein the guide sleeves 46, 48 are identical to the spindle nuts 42, 44, except for an internal thread meshing with the spindle 38, 40. See in particular the Fig. 4d as well as the Fig. 6 und 7 .

[0027] The spindle 40, the spindle nut 44 and the guide sleeve 48 are, for example, in the Fig. 4c merely indicated, since these components of the device 6 differ from other components of the device 6 in the respective figure, for example the U-profile 30 in the Fig. 4c , are concealed. As already stated above, the graphic representations and textual explanations also apply to the components that are not explicitly shown but are appropriately designed and functioning.

[0028] The respective spindle 38, 40 is arranged in the U-profile 28, 30 of the device 6 running along the spindle axis and the respective spindle nut 42, 44 and guide sleeve 46, 48 is guided in the corresponding U-profile 28, 30 perpendicular to and / or along the spindle axis essentially without play.

[0029] For this purpose, the respective spindle nut 42, 44 is designed to compensate for tolerances perpendicular to the spindle axis of the spindle 38, 40 and / or along the spindle axis, wherein the respective spindle nut 42, 44 and guide sleeve 46, 48 are biconvex along the spindle axis. See in particular the Fig. 6 und 7 Although it is in the Fig. 6 und 7 Only one of the two spindle nuts 42, 44 and guide sleeves 46, 48 is shown. However, the spindle nuts 42, 44 and the guide sleeves 46, 48 are identical in design. Furthermore, each spindle nut 42, 44 and guide sleeve 46, 48, which is made of plastic, is reversibly deformable perpendicular to and along the spindle axis of the spindle 38, 40, with each spindle nut 42, 44 and guide sleeve 46, 48 having a slot 50, 52 on both sides, such that the slot 50, 52 runs along the spindle axis.

[0030] Furthermore, the respective spindle nut 42, 44 is designed to match the corresponding U-profile 28, 30 in such a way that the play between the spindle nut 42, 44 on one side and the corresponding spindle 38, 40 on the other side along the spindle axis can be compensated in such a way that when the leg support 8 is moved between the rest position and the operating position, a substantially synchronous movement of the two sides of the retaining linkage 24 takes place.

[0031] The following describes the functioning of the seating furniture according to the invention with the device according to the invention, as illustrated in the present exemplary embodiment. Fig. 1 bis 7 explained in more detail.

[0032] As explained above, the seating furniture 2 is an armchair or multi-seater with the seat part 4 and the corresponding device 6 with the leg rest 8.

[0033] Initially, the leg rest 8 is in its resting position, i.e., in a stowed position beneath the seat section 4 of the seating unit 2. Due to the design of the device 6, the leg rest 8 has ample space in its resting position. Furthermore, the adjustment mechanism 14 positions the leg rest 8 almost flush with the underside of the seat section 4 of the seating unit 2, so that it is essentially concealed beneath the seat section 4 when not in use. The respective spindle nut 42, 44, which is firmly screwed to the retaining rod 24, is located in a first end position at the rear end of the respective U-profile 28, 30.If the user (not shown) wishes to move the leg rest 8 from its rest position to its operating position, the user can initiate control of the electric motor 12 in a manner known to those skilled in the art, for example, by actuating an actuating element (not shown). A rotor of the electric motor 12 (not shown) is rotated in a predetermined direction of rotation according to this control, so that the drive rod 32, which is coupled to this rotor in a torque-transmitting manner, rotates such that the torque, deflected by 90° by means of the respective bevel gear 34, 36, moves the spindle nut 42, 44, which is guided on the respective spindle 38, 40 in a force-transmitting manner, from the aforementioned first end position to a second end position corresponding to the operating position of the leg rest 8 at the front end of the respective U-profile 28, 30. See, for example, the [reference missing]. Fig. 3a and 3bIn summary, the same applies to the guide sleeves 46, 48 arranged in the U-profiles 28, 30, which, however, do not engage with the respective spindles 38, 40 in a driving manner. The respective end position of the spindle nut 42, 44 can be controlled in a manner known to those skilled in the art. Preferably, the limit switches used for this purpose can be integrated into the electric motor 12. This results in simple control of a stroke length corresponding to the first and second end positions. However, it is also conceivable that the aforementioned limit switches are installed in the sides of the device, for example in the U-profiles, and are controlled by means of the respective spindle nut or guide sleeve.Due to the design of the two spindle nuts 42, 44 and the guide sleeves 46, 48 described above, namely their essentially backlash-free guidance at least along the spindle axis of the respective spindles 38, 40, the spindle nuts 42, 44 and the two guide sleeves 46, 48 move essentially synchronously along the spindle axes of the two spindles 38, 40. This is because, due to their specific design, the respective spindle nut 42, 44 and guide sleeve 46, 48 must first be reversibly deformed with a predetermined force before the actual movement of the spindle nut 42, 44 and the guide sleeve 46, 48 from the first end position towards the second end position begins.By means of this deformation, the existing play on both sides of the adjusting device 14 is compensated in such a way that the two spindle nuts 42, 44 and the two guide sleeves 46, 48 move essentially synchronously to each other from the first end position to the second end position.

[0034] Here, the retaining rod 24, which is firmly screwed to the two spindle nuts 42, 44 and the two guide sleeves 46, 48, is shown in the respective image plane of the Fig. 3a and 3b moved from right to left, so that the leg support 8, which is firmly screwed to the retaining rod 24, is in the respective image plane of the Fig. 3a and 3balso moved from right to left. Firstly, the guide ramp 20 ensures that the leg support 8 is lowered from its rest position sufficiently at the beginning of its movement to allow it to be moved from back to front below the seat section 4 without collision by means of the adjusting device 14. The leg support 8 is initially lowered by gravity using the retaining linkage 24 with the actuating arms 18 and the rollers 16 until the respective roller 16 is no longer engaged with the corresponding guide ramp 20. During this process, the respective actuating arm 18 is pivoted about a corresponding pivot axis 25. The leg support 8 is then moved forward by means of the adjusting device 14, with the respective actuating arm 18 resting on the corresponding stop bolt 26 due to gravity.Subsequently, the guide ramp 22 ensures that the leg support 8 is lifted into the operating position without collision at the end of its movement by means of the adjusting device 14. In this process, the respective actuating arm 18 with the roller 16 engages with the corresponding guide ramp 22, so that the respective actuating arm 18 is pivoted against gravity about the respective pivot axis 25.

[0035] If the user wishes to return the leg rest 8 from the operating position to the resting position, this is done in the same manner as described above for the return from the resting position to the operating position. The electric motor 12 can be activated accordingly, for example, by re-actuating the operating element. Alternatively, it is also conceivable that different operating elements are provided for each direction of movement. Furthermore, other methods of operating such a piece of seating furniture that are generally known to those skilled in the art are also applicable.

[0036] Of course, embodiments of the invention are also possible in which the leg rest can be moved from its resting position to its operating position and vice versa by means of intermediate layers, either in steps or continuously. The intermediate layers are positioned between the resting position and the operating position of the leg rest 8. Accordingly, the user can move the leg rest 8 not only into the two extreme positions, but also into at least one desired intermediate position, in which the leg rest 8 is then held to support the user's feet and / or legs. This holding of the leg rest 8 in the resting position and the operating position, as well as, if applicable, in the at least one intermediate position, is achieved solely by means of the mechanism described above.Approaching one of the aforementioned positions can be achieved, for example, by means of a number of actuations of the actuating element corresponding to the respective position, by means of different actuating elements, or by means of other suitable operating concepts.

[0037] Due to the inventive design of the device 6 and the seating furniture 2, it is possible to achieve very good guidance when transferring the leg rest 8 between the rest position and the operating position, even with a structurally and manufacturing-wise simplified design of the device 6. Accordingly, the material requirements and the weight of the device 6 are reduced compared to the prior art. Despite the aforementioned reduction in design, the leg rest 8 can be moved reliably back and forth, with the leg rest 8 being guided by the at least one actuating arm 18 with the roller 16 and the corresponding guide ramps 20, 22 only when the leg rest 8 is stowed below the seat part 4 of the seating furniture 2 and when the leg rest 8 is finally positioned in front of the seat part 4 of the seating furniture 2.Accordingly, the leg rest 8 can be stored largely invisibly beneath the seat section 4 in its resting position and positioned completely in front of the seat section 4 in its operating position, for example, at a height essentially equal to that of the seat surface of the seat section 4. The excellent synchronization of the two sides of the support rod 24 for holding and moving the leg rest 8 relative to the base frame 10 of the device 6 effectively prevents tilting and thus stiffness, blockage, or even damage to the adjustment mechanism 14 during movement of the aforementioned leg rest 8, i.e., during its movement from the resting position to the operating position and vice versa. The device 6 according to the invention, with the adjustment mechanism 14, is therefore designed to be functionally reliable and durable.The single electric motor 12 of the adjustment device 14, due to its stationary position, does not need to move along with the leg support 8 as is usually the case. This allows for either greater stability of the device 6 compared to the prior art, or, with comparable stability, a less material-intensive and / or more space-saving design. Furthermore, the essentially central positioning of the single electric motor 12 ensures that unwanted torque input into the device 6 due to this motor 12 is easily avoided. Moreover, the aforementioned advantages can be achieved with the device 6 in a very simple and robust manner from a design and manufacturing perspective.

[0038] The invention is not limited to the present embodiment. See, for example, the relevant explanations in the introductory section of the description and the optional and alternative features in the specific description section. Bezugszeichenliste

[0039] 2 Seating furniture 4 Seat parts 6 Device 8 Leg rest 10 Base frame 12 Electric motor 14 Adjustment device 16 Caster 18 Actuating arms 20 Guide ramp 22 Guide ramp 24 Support rod 25 Swivel axis 26 Stop bolt 28 Side panel (U-profile) 30 Side panel (U-profile) 32 Drive rod 34 Angle gear 36 Angle gear 38 Spindle 40 Spindle 42 Spindle nut 44 Spindle nut 46 Guide sleeve 48 Guide sleeve 50 Slot 52 Slot

Claims

1. Device (6) for a piece of seating furniture (2), comprising a base frame (10) for attaching the device (6) to an underside of a seat part (4) of the seating furniture (2), a leg rest (8) for supporting the legs of a user of the seating furniture (2), and an adjustment device (14) comprising an electric motor (12) for attaching the leg rest (8) to the base frame (10) and for electrically moving the leg rest (8) from a rest position to a working position and vice versa, wherein the leg rest (8) is arranged completely below the seat part (4) in the rest position and completely in front of the seat part (4) in the working position, and wherein the adjustment device (14) has at least one actuating arm (18) having a roller (16) at its free end and two guide ramps (20, 22) for force-transmitting guidance of the respective roller (16), characterized by the fact thatthe at least one actuating arm (18) with the roller (16) and the corresponding guide ramps (20, 22) are designed and arranged in such a way that the roller (16) is in force-transmitting contact with one of the two guide ramps (20, 22) only at the beginning and at the end of the respective movement when the leg support (8) is moved from the rest position to the operating position and vice versa, and is otherwise without any force-transmitting guidance.

2. Device (6) according to claim 1, characterized by the fact thatthe at least one actuating arm (18) is movably arranged on a retaining linkage (24) of the adjusting device (14) for holding the leg support (8) such that the actuating arm (18) with the roller (16) is on the one hand movable in engagement with the respective guide ramp (20, 22) following a contour of this guide ramp (20, 22) and can be held in the rest position and operating position respectively and is otherwise held on the retaining linkage (24) by gravity by means of a stop device of the retaining linkage (24), preferably that the stop device is designed as a stop bolt (26) of the retaining linkage (24).

3. Device (6) according to claim 1 or 2, characterized by the fact that the base frame (10) is designed in a frame-like manner, preferably that the base frame (10) has two side parts (28, 30) each designed as a U-profile, particularly preferably that the adjustment device (14) is arranged at least partially within the U-profiles (28, 30).

4. Device (6) according to any one of claims 1 to 3, characterized by the fact that the electric motor (12) is fixedly arranged at a rear end of the seating furniture (2) on the base frame (10), preferably that the electric motor (12) is arranged substantially centrally between two sides of the base frame (10).

5. Device (6) according to any one of claims 1 to 4, characterized by the fact that the electric motor (12) is connected by means of at least one drive rod (32) to a remainder of the adjusting device (14) having at least one actuating arm (18) in a torque-transmitting manner, preferably that the drive rod (32) is designed as a polygonal rod, particularly preferably that the polygonal rod is designed as a hexagonal rod.

6. Device (6) according to claim 5, characterized by the fact thatthe aforementioned remainder of the adjusting device (14) comprises two bevel gears (34, 36), wherein the bevel gears (34, 36) are each connected on the drive side to the electric motor (12) in a torque-transmitting manner and on the output side to each spindle (38, 40) in a torque-transmitting manner, and wherein the respective spindle (38, 40) cooperates in a force-transmitting manner with a spindle nut (42, 44) corresponding to this spindle (38, 40) and mechanically connected to a retaining linkage (24) having at least one actuating arm (18) for holding the leg support (8).

7. Device (6) according to claim 6, characterized by the fact thatThe adjusting device (14) has, in addition to the spindle nuts (42, 44), two guide sleeves (46, 48) which are each longitudinally guided by the corresponding spindle (38, 40), wherein the two guide sleeves (46, 48) are also mechanically connected to the retaining linkage (24), preferably that the guide sleeves (46, 48), except for an internal thread cooperating with the spindle (38, 40), are identical to the spindle nuts (42, 44).

8. Device (6) according to claim 6 or 7, referring back to claim 3, characterized by the fact that the respective spindle (38, 40) is arranged in the U-profile (28, 30) of the device (6) running along the spindle axis and the respective spindle nut or the respective spindle nut (42, 44) and guide sleeve (46, 48) is / are guided in the corresponding U-profile (28, 30) perpendicular to and / or along the spindle axis essentially without play.

9. Device (6) according to any one of claims 6 to 8, referring back to claim 3, characterized by the fact that the respective spindle nut (42, 44) is designed to compensate for tolerances perpendicular to a spindle axis of the spindle (38, 40) and / or along the spindle axis (38, 40), preferably that the respective spindle nut (42, 44) is biconvex along the spindle axis.

10. Device (6) according to claim 9, characterized by the fact that the respective spindle nut (42, 44) is designed to be reversibly deformable perpendicular to and / or along the spindle axis, preferably that the respective spindle nut (42, 44) has a slot (50, 52) on both sides, particularly preferably that the slot (50, 52) runs along the spindle axis.

11. Device (6) according to any one of claims 6 to 10, characterized by the fact thatthe respective spindle nut (42, 44) is designed to match the corresponding U-profile (28, 30) in such a way that the play between the spindle nut (42, 44) on one side and the corresponding spindle (38, 40) on the other side along the spindle axis can be compensated in such a way that when the leg support (8) is moved between the rest position and the operating position, the two sides of the retaining linkage (24) move in a substantially synchronous manner.

12. Seating furniture (2), comprising at least one seat part (4) for a user of the seating furniture (2) to sit on and at least one device (6) associated with the at least one seat part (4) with a leg rest (8) for foot support of the user, characterized by the fact that the device (6) is designed according to one of claims 1 to 11.

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