Extendable upholstered furniture

Abstract

The invention relates to an extendable upholstered piece of furniture (100) which can be moved by motor into a lying position (A) or a sitting position (B). The upholstered furniture (100) comprises: - a motor (10), - a stationary base frame (20) with at least two substantially horizontal stabilizing guides (25), - a backrest (30) with a storage compartment (35), - at least one seat element (40), - at least one head element (50) with at least one guide element (55), wherein the seat element (40) and / or the head element (50) can be moved horizontally forwards and backwards relative to the base frame (20) along the stabilizing guides (25) by the motor (10), wherein the seat element (40) and the head element (50) are coupled to each other by a joint mechanism (60) and are forcibly adjustable, wherein in the reclining position (A) the seat element (40) and the head element (50) together form a substantially common flat lying surface,wherein in the seated position (B) only the seat element (40) forms a substantially flat seat surface, wherein in the seated position (B) the head element (50) can be stowed in a substantially vertical position within the storage space (35) of the backrest (30), wherein a central lifting and stowing guide (70), which is preferably decoupled from the stabilizing guides (25), is provided for lifting the head element (50) from the stabilizing guides (25) and for stowing the head element (50) in the storage space (35), wherein the central lifting and stowing guide (70) has a support surface (75) on which the guide element (55) of the head element (50) can rest and be moved.

Description

[0001] The present invention relates to an extendable upholstered piece of furniture which can be moved by motor into a lying position or a sitting position.

[0002] A wide variety of upholstered furniture in numerous designs is already known from current technology. In particular, there are chaise lounges and beds that can be converted into seating, either manually or electrically, or vice versa. Such convertible upholstered furniture represents an extremely practical solution for small apartments or guest rooms and is therefore highly sought after.

[0003] There are various solutions available in the current state of the art for converting such upholstered furniture.

[0004] Most convertible upholstered furniture typically features a fold-out, tiltable and / or movable top section and a stationary bottom section, with the top section usually forming a reclining or seating surface and being able to be folded out, tilted or moved relative to the stationary bottom section.

[0005] The major problem with currently known convertible upholstered furniture is that it has a mechanically very disadvantageous conversion mechanism. This major problem stems primarily from the fact that the different kinematic movements, especially the horizontal and vertical movements, are not decoupled from each other in the conversion mechanism.

[0006] In other words, the horizontal and vertical movement sequences in currently known convertible upholstered furniture are not functionally separated, but are carried out by one and the same conversion mechanism.

[0007] The horizontal and vertical movements are achieved primarily via two lateral guides. These two lateral guides are located at the edges of the upper surface of the lower part. To facilitate the relative movement between the movable upper part and the stationary lower part, rollers are typically provided on the underside of the movable upper part, which are movable along the two lateral guides located on the upper surface of the lower part.

[0008] The inseparated execution of the different kinematic movements, especially the horizontal and vertical movements, via the same two lateral guides means that a great deal of skill, time, and muscle power or motor power is required during conversion, especially when moving from a lying position to a sitting position or vice versa, since the two lateral guides must bear the entire weight of the movable upper part as well as all loads exerted on the lying or sitting surface of the movable upper part, especially the body weight of the person sitting or lying down.

[0009] Furthermore, the two lateral guides are often very fragile, so that the two lateral guides, especially with frequent conversion, bend or become damaged due to the high stress resulting from the simultaneous or unseparated different kinematic movements.

[0010] The bending or damage to the two side guides severely impairs or even blocks the movement of the casters, leading to tilting and a significant amount of noise, which the customer finds very disturbing. However, the technically far more problematic issue is that the upholstered furniture can no longer remain securely in its reclining or sitting position.

[0011] In summary, it can be stated that due to the inseparated execution of the different kinematic movement sequences, especially the horizontal and vertical movement sequences, by only two lateral guides, the technical functionality can no longer be guaranteed with frequent conversion.

[0012] It is therefore an object of the present invention to at least partially overcome the disadvantages described above in convertible upholstered furniture. In particular, it is an object of the present invention to create an improved convertible upholstered furniture that, compared to the prior art, can be converted more reliably, quietly, quickly, comfortably, and above all more efficiently from a reclining position to a sitting position or vice versa, even after frequent conversion.

[0013] The above problem is solved by an extendable upholstered furniture with the features of claim 1.

[0014] Further features and details of the invention can be found in the dependent claims, the description and the drawings.

[0015] According to the invention, the problem is solved by an extendable upholstered piece of furniture which can be moved into a lying position or a sitting position by motor.

[0016] The extendable upholstered furniture includes: a motor, a stationary base frame with at least two essentially horizontal stabilizing guides, a backrest with a storage compartment, at least one seat element, at least one head element with at least one guide element, wherein the seat element and / or the head element can be moved horizontally forwards and backwards relative to the base frame along the stabilizing guides by the motor, wherein the seat element and the head element are coupled to each other by a joint mechanism and are forcibly adjustable, wherein in the reclining position the seat element and the head element together form a substantially common flat lying surface, wherein in the sitting position only the seat element forms a substantially flat sitting surface, wherein in the sitting position the head element can be stowed in a substantially vertical position within the storage space of the backrest, wherein a central lifting and stowing guide is provided for lifting the head element from the stabilizing guides and for stowing the head element in the storage space, wherein the central lifting and stowing guide has a support surface on which the guide element of the head element can rest and move.

[0017] A convertible upholstered piece of furniture, in particular one that can be extended and retracted by a motor, is thus provided, which can be converted into a reclining or a sitting position. In other words, the upholstered furniture according to the invention can be adapted to various needs and thus used multifunctionally, so that the upholstered furniture according to the invention can, in particular, provide a reclining or sleeping option or a seating option.

[0018] The core idea of ​​the invention is to functionally separate or decouple the different kinematic movement sequences, in particular the horizontal movement sequence and the vertical movement sequence, which determine the conversion mechanism, in order to ensure a significant minimization of forces.

[0019] The horizontal movement sequence describes in particular a movement in which all points of the seat element and / or the head element experience essentially the same translational horizontal displacement relative to the base frame.

[0020] According to the invention, the base frame has at least two essentially horizontal stabilizing guides along which the seat element and / or the head element can be moved horizontally forwards and backwards.

[0021] The vertical movement sequence generally describes a movement that can result from rising, twisting, folding, tilting, turning, leaning, or a combination thereof. The vertical movement sequence specifically describes a movement in which all points of the head element can be moved forwards and backwards around a hypothetical turning point from an essentially horizontal position to an essentially vertical position. The vertical movement sequence specifically describes a movement to lift the head element from the stabilizing guides and to stow the head element in a storage compartment of the backrest.

[0022] According to the invention, an additional and separate central lifting and stowing guide is provided for this purpose, wherein the central lifting and stowing guide has a support surface on which a guide element of the head element can rest and be moved.

[0023] The essential technical advantage of the upholstered furniture according to the invention is that, due to the deliberate and targeted separation or decoupling of the horizontal and vertical movement sequences from each other, the conversion of the upholstered furniture according to the invention, in particular when transitioning from a lying position to a sitting position or vice versa, requires significantly less skill, time, and muscle power or motor power compared to the prior art, since the forces occurring during the conversion are broken down into horizontal and vertical force components, which can now be absorbed separately on the one hand by the stabilizing guides and on the other hand by the additional central lifting and storage guide according to the invention.

[0024] This ensures that the stabilizing guides do not bend or become damaged even after frequent conversion, so that the technical functionality of the upholstered furniture according to the invention can be guaranteed for a long time.

[0025] Decoupling the horizontal and vertical movements also significantly improves the rolling performance of the casters, as they are no longer blocked, thus preventing jamming. This improved rolling performance, in turn, drastically reduces noise, which is perceived as very positive by the customer. Furthermore, decoupling the horizontal and vertical movements ensures that the upholstered furniture according to the invention can now remain firmly in its reclining or sitting position.

[0026] Preferably, the base frame is box-shaped, in particular a base box with a cavity, and has a first end and a second end, with the stabilizing guides extending from the first end to a point spaced a certain length away from the second end. According to the invention, it is explicitly provided that the stabilizing guides serve to stabilize the seat element and / or the head element and exclusively to execute the horizontal movement, in particular the uniform translational, essentially horizontal displacement of the seat element and / or the head element relative to the base frame. A vertical movement by the stabilizing guides is deliberately and intentionally not provided for and is not desired.The stabilizing guides are essentially provided laterally, particularly at the edges, of the base frame, such that one stabilizing guide is arranged to the left and one to the right of the central lifting and stowing guide, respectively, spaced apart. In other words, the central lifting and stowing guide is arranged between the stabilizing guides, with one stabilizing guide positioned to the left and one to the right of the central lifting and stowing guide, respectively, and also at the edges of the base frame. The central lifting and stowing guide according to the invention is arranged centrally such that it is spaced evenly or substantially evenly from the lateral, particularly edge-side, stabilizing guides. Or, to put it another way, the central lifting and stowing guide according to the invention is arranged centrally, symmetrically, and spaced apart from the lateral, particularly edge-side, stabilizing guides.

[0027] Preferably, the base frame has at least two upper stabilizing guides and at least two lower stabilizing guides, with the upper stabilizing guides being located on a top surface of the base frame and the lower stabilizing guides on an inner surface of the base frame. This allows for a further improvement in the translational, essentially horizontal displacement of the seat element and / or the head element relative to the base frame by further decomposing the horizontal movement. In other words, not only are the horizontal and vertical movements decoupled from each other, but the horizontal movement itself is also further divided into two subordinate, separate horizontal movements, so that a separate horizontal movement is provided for the seat element and the head element.In other words, separate stabilizing guides are provided for the seat element and the head element, with the seat element preferably being horizontally movable forwards and backwards along the lower stabilizing guides and the head element along the upper stabilizing guides, thus allowing for better distribution of the forces that occur. The separate provision of the upper and lower stabilizing guides offers the technical advantage that they can be flexibly designed and dimensioned differently, independently of each other, taking into account the forces that occur.

[0028] For example, it is conceivable that the lower stabilizing guides could be longer, larger, and / or more robust, and made of a different material than the upper stabilizing guides. This is because the lower stabilizing guides are responsible for supporting the entire weight of the comparatively larger and heavier seat element, as well as all loads exerted on the seat's lying or sitting surface, particularly the body weight of the person sitting or lying down. In other words, this takes into account that the upper and lower stabilizing guides are subjected to different loads, preventing them from bending or becoming damaged, even after frequent conversions, as is the case in the prior art. This, in turn, ensures the long-term technical functionality of the upholstered furniture according to the invention. The separate provision of the upper and lower stabilizing guides...The lower stabilizing guides offer the further technical advantage that, in the event of maintenance, the stabilizing guides can be replaced independently of each other. Individual defective stabilizing guides can be replaced easily and cost-effectively without affecting the other stabilizing guides.

[0029] Preferably, the upper stabilizing guides are open and the lower stabilizing guides are closed. The upper stabilizing guides serve to stabilize and execute the horizontal movement of the head element. The lower stabilizing guides serve to stabilize and execute the horizontal movement of the seat element. The open design of the upper stabilizing guides has the technical advantage that the head element can be lifted from the upper stabilizing guides, and in particular, the head element can be stowed in the storage space by means of the central lifting and stowing guide according to the invention.The lifting action can be understood as the head element either being completely separated from the stabilizing guides and no longer touching them, or being partially separated from the stabilizing guides while still being partially guided on the surface of the upper stabilizing guides. The closed design of the lower stabilizing guides has the technical advantage that the seat element is guided within the lower stabilizing guides and is therefore, in particular, precisely guided, so that tilting and / or disengagement—i.e., displacement of the seat element relative to the base frame transversely to the direction of the lower stabilizing guides—is prevented.

[0030] Preferably, the central lifting and stowing guide (for the head element) has a curved path. The central lifting and stowing guide according to the invention is arranged between the lateral, particularly edge-side, stabilizing guides. The central lifting and stowing guide according to the invention serves exclusively to execute the vertical movement sequence, in particular to lift the head element from the stabilizing guides and to stow the head element in the (cavity-like) storage space of the backrest. The curved path ensures, in particular, a seamless transition between the horizontal and vertical movements of the head element, thus decoupling the horizontal and vertical movements from each other. The curved path allows moments and forces to be absorbed evenly, enabling stable and precise guidance.Due to its continuously rising curve, the curved track allows the moments and forces acting during the transition between horizontal and vertical motion to be transmitted smoothly and without sudden changes in direction, thus drastically reducing wear and stress. In other words, the curved track enables a precise and harmonious, and especially decoupled, vertical motion, while simultaneously avoiding abrupt changes in direction, particularly stops and starts.

[0031] The vertical movement sequence generally describes a movement that can result from lifting, rising, twisting, tilting, turning, inclining, or a combination thereof. In particular, the vertical movement sequence can describe a movement in which all points of the head element can be moved forwards and backwards around a fictitious turning point from an essentially horizontal position to an essentially vertical position. The steeper the curve of the curved track or the central lifting and stowing guide according to the invention, the faster the head element can be moved from an essentially horizontal position to an essentially vertical position. In other words, the steeper the curve of the curved track or the central lifting and stowing guide according to the invention, the faster the head element can be lifted from the stabilizing guides and stowed in the storage compartment of the backrest.The inventive central lifting and stowing guide is designed in various ways. It is conceivable that the curved path or the inventive central lifting and stowing guide has a ramp-like shape with a steep incline. It is also conceivable that the curved path or the inventive central lifting and stowing guide has a different curved shape suitable for enabling a smooth transition between the horizontal and vertical movements without a sudden change of direction.Since the central lifting and stowing guide according to the invention serves exclusively for executing the vertical movement sequence, in particular for lifting the head element from the stabilizing guides and stowing the head element in the storage compartment of the backrest, the central lifting and stowing guide according to the invention has no or only a very small horizontal section, this very small horizontal section being provided solely for docking or transitioning during the lifting of the head element from the stabilizing guides. Preferably, the curved track or the central lifting and stowing guide according to the invention runs in a semicircular shape. This allows the curved track or the central lifting and stowing guide according to the invention to be designed in a very space-saving manner, particularly in confined spaces, without the need for additional mechanical guide and deflection rail systems.In other words, this enables a very compact and cost-effective construction of the upholstered furniture according to the invention, particularly the backrest. The semicircular curve is especially suitable for repetitive movement cycles, particularly for repeated transitions from a reclining position to a sitting position or vice versa. It is also conceivable that the curved path or the central lifting and storage guide according to the invention only approximates a semicircle. It is conceivable that the curved path or the central lifting and storage guide according to the invention is essentially S-shaped, arc-shaped, wave-shaped, parabolic, meandering, vertical, or orthogonal, or has sections that vary in some areas and are combined in combination, such that the vertical movement sequence has combined movement components.

[0032] According to the invention, the central lifting and stowing guide explicitly provides a support surface on which the guide element of the head element can rest (roll) and move. Preferably, the guide element of the head element is designed as a roller or a sliding element. The guide element of the head element is specifically designed to control the vertical movement along the predetermined path, in particular along the curved path or the central lifting and stowing guide according to the invention. In other words, the guide element of the head element ensures precise movement along a defined path, which is of great technical importance for the precise and comfortable extension and retraction of the upholstered furniture according to the invention, especially for transitioning from a reclining position to a sitting position or vice versa.The guide element of the head element is advantageously made of a robust material such as hardened steel or high-strength plastic, enabling it to absorb, and in particular bear, high loads. In other words, the guide element of the head element has a very high load-bearing capacity. Particularly when the guide element is designed as a roller, preferably a ball- or needle-bearing roller, and more preferably a rubberized roller, shocks and vibrations can be cushioned or dampened, resulting in excellent running characteristics and reducing or eliminating noise. Furthermore, when the guide element is designed as a roller, the high loads can be distributed relatively evenly across the contact surface of the central lifting and stowing guide according to the invention.It is conceivable that the head element has several guide elements. It is also conceivable that the guide element is multi-part and has several components, in particular several rollers and / or sliding elements, whereby the components can be arranged parallel, in series, or offset from one another.

[0033] Preferably, the sliding element is designed as a roller, a sliding block, or a nonwoven element. Rollers are particularly characterized by their ability to both roll and slide. The combination of rolling and sliding reduces resistance, resulting in smoother movement along the curved track or the central lifting and storage guide according to the invention. Rollers can also absorb or bear very high loads and distribute them evenly across the contact surface of the central lifting and storage guide according to the invention. Sliding blocks offer even smoother running. In other words, designing the guide element as a sliding block ensures even smoother and less vibrational, and in particular very quiet, movement along the curved track or the central lifting and storage guide according to the invention.Due to their special material structure or weave, nonwoven elements exhibit a particularly effective damping effect, absorbing shocks and vibrations even more effectively and thus ensuring smoother operation. Furthermore, nonwoven elements are very cost-effective and easy to install. They can be attached to the head element by means of a form-fit or force-fit connection, for example, using rivets, clamps, screws, or even by bonding, such as adhesive bonding.

[0034] Preferably, the contact surface of the central lifting and storage guide is made of plastic, metal, wood, or a similar material. The contact surface is formed, in particular, by a curved sheet of metal with a specific length, width, and thickness, wherein the length and width are advantageously defined by the curve of the curved track or the central lifting and storage guide according to the invention. It is conceivable that the width of the contact surface corresponds to the width, or substantially to the width, of the guide element of the head element. It is conceivable that the width of the contact surface is substantially, preferably twice, and particularly preferably three times, as wide as the width of the guide element of the head element. It is conceivable that the contact surface is open. It is conceivable that the contact surface is semi-open or closed, in particular as a guide rail.It is conceivable that the support surface extends over the entire area of ​​the central lifting and stowing guide or is provided only in certain sections of the central lifting and stowing guide. It is also conceivable that the support surface is interrupted or composed of several individual surfaces. The support surface serves as a rolling or sliding surface and simultaneously as a bearing for load bearing, which is exerted during the vertical movement sequence or during the transition from a lying to a sitting position or vice versa. Particularly when the support surface is made of metal, preferably hardened metal, a guide surface can be provided that is highly resistant to abrasion.In other words, the contact surface is very stable and dimensionally stable due to the high stiffness and strength of the metal, so that the contact surface, especially the sheet metal, does not deform and therefore does not negatively affect the vertical movement in any way. The plastic design of the contact surface offers the advantage of further reducing frictional resistance, as plastic has natural sliding properties. Furthermore, plastic is resistant to dust, dirt, and moisture, which can accumulate, especially over extended periods. In addition, plastic is significantly less expensive to manufacture and easier to adapt to the geometry of the curved track or the central lifting and storage guide according to the invention.

[0035] Preferably, the contact surface has a coating. This coating can be, in particular, a low-friction coating. Especially when the contact surface is made of metal, such a low-friction coating can drastically reduce the frictional resistance between the guide element of the head element and the contact surface, thus ensuring a virtually frictionless and therefore very energy-efficient vertical movement with excellent rolling characteristics. Due to the extremely low frictional resistance, optimal contact surface properties prevail, resulting in virtually no wear between the guide element of the head element and the contact surface.This extends both the service life of the guide element of the head element and the service life of the support surface, so that in turn the technical functionality of the upholstered furniture according to the invention can be guaranteed for a long time.

[0036] Preferably, the central lifting and stowing guide according to the invention has several webs. It is also conceivable that the central lifting and stowing guide according to the invention has only a single web. The preferably multiple webs constitute, in particular, structural elements of the central lifting and stowing guide according to the invention in order to increase the strength and stiffness of the support surface. In other words, the multiple webs serve as a support structure for structural stabilization and a supporting effect on the support surface, so that the support surface is not deflected or only deflected minimally during the vertical movement sequence. In particular, the multiple webs significantly increase the stiffness and force transmission of the central lifting and stowing guide according to the invention, so that the acting forces can be absorbed and dissipated evenly.In other words, a targeted arrangement and design of the multiple struts can ensure force minimization, enabling the central lifting and storage guide according to the invention, and in particular the support surface, to withstand the external forces resulting from the vertical movement without deforming or bending. It is conceivable that the support surface of the central lifting and storage guide according to the invention is formed by the multiple struts themselves. In other words, this eliminates the need for a metal or plastic sheet, which in turn leads to significant cost savings and simplified construction, especially in mass production. The support surface formed by the multiple struts can, in turn, have a previously described low-friction coating, either partially or completely. Preferably, the multiple struts are each made of wood, plastic, or metal.Preferably, the geometric shape of each bridge or a section of a bridge corresponds to the curve shape of the curved track or the central lifting and stowing guide according to the invention.

[0037] In principle, the base frame and the backrest form a single unit, which can be either one-piece or multi-piece. A one-piece unit can be understood as a single, continuous component in which the base frame and the backrest are formed from a single, continuous component, whereas a multi-piece unit is characterized by the fact that the base frame and the backrest are each formed from several individual structural elements that can be permanently and / or detachably connected to one another. Preferably, the base frame and the backrest form a unit with a rear panel. The rear panel serves, on the one hand, as a boundary surface for the storage space of the backrest and, on the other hand, as a mounting surface for the central lifting and storage guide according to the invention.

[0038] Preferably, the back panel has a reinforcement in certain areas. Preferably, the reinforcement is provided in the area of ​​the central lifting and stowing guide according to the invention. By specifically designing and arranging the reinforcement in the area of ​​the central lifting and stowing guide according to the invention, less material can be used to achieve the same or even increased stability, which in turn leads to significant weight and cost savings. The reinforcement constitutes, in particular, a structural element of the back panel to significantly increase its strength and stiffness. In other words, the reinforcement serves as an additional support structure for structural stabilization and provides support for the back panel, preventing it from buckling or breaking during vertical movement.The reinforcement significantly increases the stiffness and force transmission of the back wall, so that the forces acting during the vertical movement sequence can be absorbed evenly.

[0039] It is conceivable that the back panel is interrupted, in particular formed from several individual panels or individual slats, thus achieving further weight and cost savings. It is conceivable, for example, that the back panel is formed from three individual panels or three individual slats. Thus, two individual panels or two individual slats can be positioned laterally, particularly at the edges, and one individual panel or individual slat can be positioned centrally in the area of ​​the central lifting and storage mechanism according to the invention. The two lateral, particularly edge-mounted, individual panels or slats can therefore be understood as the boundary surfaces of the storage space of the backrest, and the central individual panel or individual slat as the mounting surface for the central lifting and storage mechanism according to the invention.The multiple individual walls or strips can have the same geometric dimensions and material properties or be designed differently from one another. For example, it is conceivable that the two lateral, especially edge, individual walls or strips are thinner than the central individual wall or strip. It is conceivable that the rear wall has several individual cross braces to further increase the strength and rigidity of the rear wall, especially the mounting surface of the central lifting and storage guide according to the invention. The multiple individual cross braces can have the same geometric dimensions and material properties or be designed differently from one another. It is conceivable that the multiple individual walls and / or the individual cross braces are preferably each made of wood.It is also conceivable that the multiple individual walls and / or the individual crossbars are each made of plastic, metal, or a similar material. To completely close the back wall and prevent dirt from entering the storage compartment, a panel, particularly a board-like one, can be provided. It is also conceivable that the entire back wall or the multiple individual walls or slats each have a stop or stop surface, so that when the headrest is stowed in the backrest's storage compartment, it abuts the stop or stop surface upon reaching a predetermined end position. In other words, the stop or stop surface can limit or define the end position of the vertical movement.

[0040] Preferably, the seat element has support rollers. Preferably, the seat element has at least two support rollers, which are provided laterally in a front area of ​​the seat element. The support rollers can be understood as floor casters by means of which the seat element is supported on the floor, in particular in a way that allows it to roll. In other words, the support rollers, preferably small load-bearing casters, which are specifically designed to support the seat element on the floor, are intended to facilitate, in particular, the horizontal forward and backward movement of the seat element relative to the base frame during a transition from a lying position to a sitting position or vice versa. Put another way, the support rollers enable easier extension and retraction of the seat element relative to the base frame.It is conceivable that each support roller has a braking mechanism to lock the rollers in the reclining or sitting position. It is conceivable that the braking mechanism could be activated mechanically by a lever, either by foot or by hand. It is conceivable that the braking mechanism could be activated electrically, automatically or semi-automatically, by sensors or a switch. It is conceivable that the braking mechanism is based on the operating principle of a total brake, whereby the braking mechanism blocks both the rotation of the individual support rollers and the rotation of the support roller housing. It is conceivable that the braking mechanism is based on the operating principle of a wheel brake, whereby only the rotation of the individual support rollers is blocked, while allowing rotation of the housing, particularly the roller holder, of the support rollers.In other words, the braking mechanism prevents the support rollers, or a single support roller, from unintentionally moving or rolling in a specific direction, thereby causing instability of the upholstered furniture according to the invention. Put another way, the braking mechanism also ensures that the upholstered furniture according to the invention remains fixed in its reclining or sitting position. However, it is also conceivable that the braking mechanism is based on the operating principle of a directional brake, whereby the rotation of the individual support rollers is permitted, but rotation of the housing, in particular the roller holder, of the support rollers is blocked, so that the support rollers can execute a targeted, controlled movement in a specific direction, preferably only straight ahead in the longitudinal direction of the seat element or parallel to the stabilizing guides.

[0041] Preferably, the upholstered furniture according to the invention has at least one stabilizing and tensioning strap with a first end and a second end, wherein the first end is attached to the head element and the second end to the base frame. Preferably, the upholstered furniture according to the invention has at least two stabilizing and tensioning straps. The upholstered furniture according to the invention can be converted into a reclining position or a sitting position. In the reclining position, the seat element and the head element together form a substantially common flat lying surface, whereas in the sitting position, only the seat element forms a substantially flat sitting surface, and the head element can be stored in a substantially vertical position within the storage space of the backrest. The stabilizing and tensioning straps essentially fulfill two technical functions.On the one hand, the stabilizing and tensioning straps can preferably serve to provide additional stabilizing support to the head element during the vertical movement sequence, thus ensuring an even smoother transition from a lying to a sitting position or vice versa. For this purpose, the stabilizing and tensioning straps are preferably arranged laterally. On the other hand, the stabilizing and tensioning straps also serve to fix the head element horizontally, particularly in the lying position, such that the head element rests under tension on the stabilizing guides or is pulled taut against them.This is a significant advantage because the headrest cushion, especially when stored in a largely vertical position within the backrest's storage compartment for extended periods, can easily deform, particularly compress, and thus, without the stabilizing and tensioning straps, detach from or lift away from the stabilizing guides when the chair is reclined. These straps eliminate this problem.

[0042] Preferably, the upholstered furniture according to the invention has at least one armrest that can be attached to the left and / or right side of the furniture. This allows the upholstered furniture according to the invention to be understood as a single piece of upholstered furniture or as a modularly expandable, multifunctional piece of upholstered furniture that can be flexibly and individually adapted to different furniture designs, personal needs, rooms, and usage requirements. In other words, the upholstered furniture according to the invention can include further individual elements such as an armrest or a headrest, so that the upholstered furniture can be designed as a type of armchair, corner sofa, or sofa bed.It is also conceivable that the upholstered furniture according to the invention comprises further individual elements, such as an extendable chaise longue seat element, in particular one that can be moved forward of the seat element, so that the chaise longue seat element can provide an extended lying surface, in particular the length of a standard bed mattress. In other words, the upholstered furniture according to the invention can be combined, extended, or modified with further individual elements or even with other upholstered furniture. The modular system design can be understood as meaning that the upholstered furniture according to the invention can consist of, for example, five or six individual upholstered furniture elements, which can be arranged by the user as desired, for example, in a U-shape or an S-shape, and which can preferably be detachably connected to one another, for example, by means of at least one clamp.

[0043] According to the invention, the seat element and the head element are coupled to each other by a joint mechanism and are forcibly adjustable. Preferably, the joint mechanism has at least one axis of rotation, preferably several axes of rotation. This allows, in particular, complex and diverse kinematic movement sequences to be realized, while simultaneously enabling a seamless transition between the horizontal and vertical movements, so that the horizontal and vertical movements are decoupled from each other precisely and with minimal effort. The preferably multi-axis joint mechanism allows, in particular, the curved shape of the path or the central lifting and stowing guide according to the invention to be taken into account, so that the moments acting during the transition between the horizontal and vertical movements are minimized.Forces can be transmitted, especially smoothly and without sudden changes in direction, without any tilting or blockage occurring.

[0044] According to the invention, the upholstered furniture can be moved into a reclining or sitting position, preferably by motor. The motor for this is preferably an electric motor, in particular an electric rotary motor. The motorized movement, or extending and retracting, of the upholstered furniture according to the invention offers numerous advantages, especially with regard to comfort, efficiency, and safety. Motorized movement reduces the effort required, which is of enormous importance, especially for the elderly, children, or people with limited mobility. Furthermore, motorized movement ensures a fast and precise sequence of movements, which in turn significantly improves comfort. Motorized movement also increases safety, as it minimizes the risk of incorrect operation, in particular tilting or abrupt movements.Preferably, the motorized transfer can be remotely controlled by means of a remote control or a hand switch.

[0045] Preferably, the motor has a self-locking effect. The self-locking effect of the motor means that the motor is explicitly configured and designed to maintain its rotational position without requiring any additional energy input. In other words, no electrical holding or quiescent current is required. The motor does not need electrical energy to maintain its rotational position, thus drastically reducing energy consumption in stationary states, i.e., in the lying or sitting position. The self-locking effect of the motor is primarily due to a specially designed internal mechanical mechanism in which the friction between the motor components is significantly greater than the reverse force, i.e., the load, exerted to move the motor into a lying or sitting position.In other words, the self-locking effect of the motor ensures that unintentional movement is prevented. Preferably, the motor is designed as a brake motor or has an integrated brake that is automatically activated in the event of a power failure. This additionally ensures that the upholstered furniture according to the invention remains fixed in its reclining or sitting position, even when the electrical plug of the upholstered furniture according to the invention is not connected to the socket.

[0046] Preferably, the upholstered furniture according to the invention has a movement mechanism, wherein the movement mechanism is coupled to both the motor and the seat element. The movement mechanism is preferably coupled to the motor and the seat element via connecting means, in particular a fastening interface. The movement mechanism serves in particular to convert a rotational movement of the motor into a translational movement, so that the movement mechanism enables the upholstered furniture to be extended and retracted, in particular to be moved from a reclining position to a sitting position or vice versa.

[0047] Preferably, the motion mechanism comprises a gearbox, chain drive, or belt drive. The gearbox can be designed, for example, as a screw drive or worm gear. Particularly in the screw drive configuration, the self-locking effect of the motor can be further enhanced, since screw drives typically have a trapezoidal thread and therefore cannot reverse on their own, especially not slip. The special thread structure thus securely holds the load, so that in the event of a power failure, the load remains in its last position. Furthermore, screw drives are ideally suited for constant and precise linear movements and also have a very good transmission ratio, so that very high forces can be transmitted even with very low drive torque from the motor.Thus, the person does not have to get down from the upholstered furniture according to the invention to move it from a lying position to a sitting position or vice versa. The person can remain comfortably lying or sitting on the upholstered furniture. Furthermore, spindle drives are mechanically simple in design and therefore very easy to maintain. With proper lubrication, spindle drives are very durable and exhibit low wear.

[0048] An upholstered piece of furniture according to the invention is explained in more detail below with reference to drawings.

[0049] They each show schematically: Figure 1 shows an upholstered piece of furniture in a reclining position according to an embodiment of the present invention, Figure 2 shows an upholstered piece of furniture in a sitting position according to an embodiment of the present invention, Figure 3 shows an upholstered piece of furniture in a reclining position without the head element according to an embodiment of the present invention, Figure 4 shows a central lifting and storage guide with a curved track according to a further embodiment of the present invention, Figure 5 shows a central lifting and storage guide with a substantially semicircular track according to a further embodiment of the present invention, and Figure 6 shows a transition between a horizontal and vertical movement sequence according to a further embodiment of the present invention.

[0050] Fig. 1 Figure 1 shows a perspective view of an upholstered furniture 100 according to the invention in a reclining position A according to an exemplary embodiment of the invention. The upholstered furniture 100 can be motor-driven from a reclining position A to a sitting position B, as shown in Figure 1. Fig. 2 depicted, or conversely, moved from a sitting position A to a lying position B using motors.

[0051] The upholstered furniture 100 according to the invention can be understood as a single piece of upholstered furniture or as a modularly expandable, multifunctional piece of upholstered furniture that can be flexibly and individually adapted to different furniture designs, personal needs, spaces, and usage requirements. In other words, the upholstered furniture 100 according to the invention can include further individual elements not shown, such as a headrest or a chaise longue seat element, or it can be combined with, expanded, or modified by other upholstered furniture. For modular expansion, the upholstered furniture 100 has a connection system. The connection system can, for example, include several individual hooks 26 or connecting rails.

[0052] The upholstered furniture 100 comprises a motor 10, a base frame 20, a backrest 30 with a storage compartment 35, a seat element 40, and a head element 50. Depending on the configuration, the upholstered furniture 100 may have one or two armrests 80. It is also conceivable that the upholstered furniture 100 may not have armrests 80 in a particular configuration.

[0053] The backrest 30, the seat element 40 and the head element 50 can each have integrated upholstery or separate upholstery elements that can be attached to them.

[0054] The padding of the head element 50 preferably has several vertical incisions so that the head element 50 can be stowed away more easily.

[0055] The seat element 40 and / or the head element 50 can be moved forwards and backwards relative to the base frame 20 by motor, in particular extended and retracted.

[0056] In lying position A, the seat element 40 and the head element 50 together form an essentially shared, flat lying surface. In sitting position B, as in Fig. 2 As shown, only the seat element 40 forms an essentially flat seating surface.

[0057] The seat element 40 and the head element 50 are coupled to each other by a joint mechanism 60 and are forcibly adjustable, so that in the seat position B, as in Fig. 2 The head element 50 is shown to be stowed in an essentially vertical position within the storage space 35 of the backrest 30.

[0058] The seat element 40 preferably has at least two support rollers 45, which are provided, in particular, on each side in a front area of ​​the seat element 40. The support rollers 45 can be understood as floor rollers by means of which the seat element 40 is supported on the floor, in particular in a way that allows it to roll.

[0059] Fig. 3 Figure 1 shows a perspective view of an upholstered piece of furniture 100 according to the invention in a reclining position A according to an exemplary embodiment of the invention. For better understanding, the head element 50 is hidden.

[0060] The basic idea of ​​the invention is to functionally separate or decouple the different kinematic movement sequences, in particular the horizontal movement sequence and the vertical movement sequence, which determine the conversion mechanism of the upholstered furniture 100 according to the invention, in particular the transition from the lying position A to the sitting position B or vice versa the transition from the sitting position A to the lying position B.

[0061] The horizontal movement sequence describes in particular a movement in which all points of the seat element 40 and / or the head element 50 experience essentially the same translational horizontal displacement relative to the base frame 20. According to the invention, the base frame 20 is provided to have at least two essentially horizontally extending stabilizing guides 25 along which the seat element 40 and / or the head element 50 can be moved horizontally forwards and backwards.

[0062] The vertical movement sequence describes, in particular, a movement in which all points of the head element 50 can be moved forwards and backwards around a fictitious turning point W from a substantially horizontal position to a substantially vertical position. The vertical movement sequence describes, in particular, a movement for lifting the head element 50 from the stabilizing guides 25 and for stowing the head element 50 in a storage compartment 35 of the backrest 30. For this purpose, according to the invention, an additional, in particular separate, central lifting and stowing guide 70 is provided, wherein the central lifting and stowing guide 70 has a support surface 75 on which a guide element 55 of the head element 50 can rest and be moved.

[0063] The base frame 20 is box-shaped, in particular designed as a bed box, and has a first end 21 and a second end 22, wherein the stabilizing guides 25 each extend from the first end 21 to a point P which is arranged a length L away from the second end 22.

[0064] In principle, the base frame 20 and the backrest 30 form a unit, which can be designed as a single piece or in multiple parts. A single-piece unit can be understood as one in which the base frame 20 and the backrest 30 are formed from a single continuous component, whereas a multi-part unit is characterized by the fact that the base frame 20 and the backrest 30 are each formed from several individual structural elements that can be permanently and / or detachably connected to one another. The unit formed by the base frame 20 and the backrest 30 has a rear wall 23. The rear wall 23 serves, on the one hand, as a boundary surface of the storage space 35 of the backrest 30 and, on the other hand, as a mounting surface for the central lifting and storage guide 70 according to the invention. The rear wall 23 has a reinforcement 24 in certain areas.The reinforcement 24 is provided in particular in the area of ​​the central lifting and stowing guide 70 according to the invention.

[0065] As in the Fig. 3 As can be clearly seen, the stabilizing guides 25 are essentially provided laterally, particularly at the edges, on the base frame 20, such that one stabilizing guide 25 is arranged to the left and right of the central lifting and stowing guide 70. The central lifting and stowing guide 70 according to the invention is arranged centrally such that it is spaced evenly or substantially evenly from the lateral, particularly edge-side, stabilizing guides 70. The central lifting and stowing guide 70 according to the invention is arranged centrally such that it is aligned directly or substantially directly above the motor 10 and / or along a translational axis of movement of the drive train.

[0066] The upholstered furniture 100 according to the invention has a movement mechanism 15, wherein the movement mechanism 15 is coupled to both the motor 10 and the seat element 40. The movement mechanism 15 is coupled to the motor 10 and the seat element, in particular via fastening interfaces 15.1 and 15.2. The movement mechanism 15 serves, in particular, to convert a rotational movement of the motor 10 into a translational movement, so that the movement mechanism 15 enables the upholstered furniture 10 to be extended and retracted, in particular to be moved from the reclining position A to the sitting position B or vice versa.

[0067] Fig. 4 Figure 1 shows a central lifting and stowing guide 70 with a curved track 71 according to a further embodiment of the present invention.

[0068] According to this embodiment, the base frame 20 has at least two upper stabilizing guides 25.1 and at least two lower stabilizing guides 25.2, wherein the upper stabilizing guides 25.1 are provided on a top side of the base frame 20 and the lower stabilizing guides 25.2 are provided on an inside side of the base frame 20. This further improves the translational, essentially horizontal displacement of the seat element 40 and / or the head element 50 relative to the base frame 20 by further decomposing the horizontal movement sequence.

[0069] The upper stabilizing guides 25.1 are open, and the lower stabilizing guides 25.2 are closed. The upper stabilizing guides 25.1 serve to stabilize and execute the horizontal movement of the head element 50. The lower stabilizing guides 25.2 serve to stabilize and execute the horizontal movement of the seat element 40.

[0070] As in the Fig. 4 As can be clearly seen, the lower stabilizing guides 25.2 are longer than the upper stabilizing guides 25.1, so that the lower stabilizing guides 25.2 extend beyond point P.

[0071] The lower stabilizing guides 25.2 have a constant horizontal course. The upper stabilizing guides 25.1 also have a constant horizontal course. It is conceivable that the upper stabilizing guides 25.1 run essentially horizontally at a constant rate (see figure). Fig. 4 ) and / or a slightly rising and slightly falling section (see below). Fig. 5 / in the area of ​​the stabilizing element shown (50.1).

[0072] The seat element 40 is precisely guided within the lower stabilizing guides 25.2 by stabilizing elements 40.1, so that tilting and / or disengagement, i.e., displacement of the seat element 40 relative to the base frame 20 transversely to the direction of the lower stabilizing guides 25.2, is prevented. The stabilizing elements 40.1 are connected to a support 42, which in turn is connected to the underside of the seat element 40.

[0073] The head element 50 is guided freely by stabilizing elements 50.1 on the surface of the upper stabilizing guides 25.1 in such a way that it is possible to lift the head element 50 from the upper stabilizing guides 25.1, in particular to stow the head element 50 in the storage space 35 of the backrest 30.

[0074] The stabilizing elements 40.1 and 50.1 can, for example, each be designed as a roller, sliding element or wooden block.

[0075] As further in the Fig. 4 As can be clearly seen, the upholstered furniture 100 according to the invention has two stabilizing and tensioning straps 36, each having a first end and a second end. The first end is attached to the head element 50 and the second end to the base frame 20. Preferably, the upholstered furniture according to the invention has at least two stabilizing and tensioning straps. The stabilizing and tensioning straps 36 are made of a tear-resistant and highly resilient material, preferably high-strength polyester, nylon, or aramid.

[0076] What's next in the Fig. 4 As can be clearly seen, the central lifting and stowing guide 70 has a curved track 71. The central lifting and stowing guide 70 according to the invention serves exclusively for the execution of the vertical movement sequence, in particular for lifting the head element 50 from the upper stabilizing guides 25.1 and for stowing the head element 50 in the storage compartment 35 of the backrest 30. The curved track 71 ensures a seamless transition between the horizontal and vertical movements, thus decoupling the horizontal and vertical movements from each other. The curved track 71 also absorbs moments and forces evenly, enabling stable and precise guidance. Due to its continuously rising curve, the curved track 71 absorbs the moments and forces acting during the transition between the horizontal and vertical movements.Forces are transmitted smoothly and without sudden changes in direction, drastically reducing wear and tear.

[0077] It is conceivable that the curved track 71 or the central lifting and stowing guide 70 according to the invention has a different curve shape, as in the Fig. 5 and Fig. 6 shown, which is suitable to allow a smooth transition without sudden changes in direction between the horizontal and vertical movement sequence.

[0078] Fig. 5 Figure 1 shows a central lifting and stowing guide 70 according to a further embodiment of the present invention. According to this embodiment, the central lifting and stowing guide 70 has a substantially semicircular path. The steeper the curve of the curved path 71 or the central lifting and stowing guide 70 according to the invention, the faster the head element 50 is moved from a substantially horizontal position to a substantially vertical position. In other words, the steeper the curve of the curved path 71 or the central lifting and stowing guide 70 according to the invention, the faster the head element 50 can be lifted from the upper stabilizing guides 25.1 and stowed in the storage compartment 35 of the backrest 30.

[0079] Fig. 6 shows a central lifting and stowing guide 70 according to a further embodiment of the present invention.

[0080] By means of the central lifting and stowing guide 70 according to the invention, all points of the head element 50 can be moved forward and backward about a fictitious turning point W from an essentially horizontal position to an essentially vertical position.

[0081] The central lifting and stowing guide 70 according to the invention serves exclusively to execute the vertical movement sequence, in particular to lift the head element 50 from the upper stabilizing guides 25.1 and to stow the head element 50 in the storage space 35 of the backrest 30.

[0082] Therefore, the central lifting and stowing guide 70 according to the invention has no or only a very small horizontal section, this very small horizontal section being provided only for docking the head element 50.

[0083] As in the Fig. 6 As can be clearly seen, the curved track 71 of the central lifting and storage guide 70 according to the invention runs essentially in a semicircle. This allows the central lifting and storage guide 70 according to the invention to be designed in a very space-saving manner, particularly in confined spaces, without the need for additional mechanical guide and deflection rail systems. In other words, this enables a very compact and cost-effective overall design of the upholstered furniture 100 according to the invention, especially the backrest 30.

[0084] According to the invention, it is explicitly provided that the central lifting and stowing guide 70 has a support surface 75 on which a guide element 55 of the head element 50 can rest and move. The guide element 55 of the head element 50 can preferably be a roller 51 or a sliding element 52, as shown in the Fig. 4 The guide element 55 of the head element 50 is specially designed to control the vertical movement sequence along the predetermined path, in particular along the curved path 71 or the central lifting and stowing guide 70 according to the invention, without sudden changes of direction or tilting.

[0085] The support surface 75 of the central lifting and stowing guide 70 can be made of plastic or metal. The support surface 75 is in particular formed by a bent sheet metal part.

[0086] The contact surface 75 has a special coating. This coating is, in particular, a low-friction coating. Such a special low-friction coating drastically reduces the frictional resistance between the guide element 55 of the head element 50 and the contact surface 75, thus ensuring a virtually frictionless and therefore very energy-efficient vertical movement with excellent rolling characteristics. Due to the extremely low frictional resistance, optimal contact surface properties prevail, resulting in virtually no wear between the guide element 55 of the head element 50 and the contact surface 75. This extends the service life of both the guide element 55 of the head element 50 and the service life of the contact surface 75, thereby ensuring the long-term technical functionality of the upholstered furniture 100 according to the invention.

[0087] The central lifting and storage guide 70 according to the invention has several webs 72. It is also conceivable that the central lifting and storage guide 70 according to the invention has only a single web 72. The several webs 72 represent, in particular, structural elements of the central lifting and storage guide 70 according to the invention in order to increase the strength and stiffness of the support surface 75. In other words, the several webs 72 serve as a support structure for structural stabilization and a supporting effect on the support surface 75, so that the support surface 75 is not bent during the vertical movement sequence. Bezugszeichenliste

[0088] 10 Motor 15 Movement mechanism 20 Base frame 21 First end of base frame 22 Second end of base frame 23 Back panel 24 Reinforcement 25 Stabilizing guides 25.1 Upper stabilizing guides 25.2 Lower stabilizing guides 26 Hook 30 Backrest 35 Storage space 36 Stabilizing and tensioning strap 40 Seat element 40.1 Stabilizing elements of the seat element 42 Support 45 Support rollers 50 Head element 50.1 Stabilizing elements of the head element 51 Roller 52 Sliding element 55 Guide element 60 Joint mechanism 70 Lifting and storage guide 71 Curved track 72 Webs 75 Support surface of the lifting and storage guide 80 Armrest 100 Upholstered furniture Reclining position B seating position L length P point W fictitious turning point

Claims

1. Extendable upholstered furniture (100) which can be moved by motor into a reclining position (A) or a sitting position (B), the upholstered furniture (100) comprising: - a motor (10), - a stationary base frame (20) with at least two substantially horizontal stabilizing guides (25), - a backrest (30) with a storage compartment (35), - at least one seat element (40), - at least one head element (50) with at least one guide element (55), wherein the seat element (40) and / or the head element (50) can be moved horizontally forwards and backwards relative to the base frame (20) along the stabilizing guides (25) by the motor (10), wherein the seat element (40) and the head element (50) are coupled to each other by a joint mechanism (60) and are forcibly adjustable, wherein in the reclining position (A) the seat element (40) and the head element (50) together form a substantially common plane form a lying surfacewherein in the seated position (B) only the seat element (40) forms a substantially flat seat surface, wherein in the seated position (B) the head element (50) can be stowed in a substantially vertical position within the storage space (35) of the backrest (30), wherein a central lifting and stowing guide (70), which is preferably decoupled from the stabilizing guides (25), is provided for lifting the head element (50) from the stabilizing guides (25) and for stowing the head element (50) in the storage space (35), wherein the central lifting and stowing guide (70) has a support surface (75) on which the guide element (55) of the head element (50) can rest and be moved.

2. Extendable upholstered furniture (100) according to claim 1, characterized by the fact thatthe base frame (20) is box-shaped and has a first end (20) and a second end (22), wherein the stabilizing guides (25) each extend from the first end (21) to a point (P) which is spaced a length (L) away from the second end (22).

3. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact that the base frame (20) has at least two upper stabilizing guides (25.1) and at least two lower stabilizing guides (25.2), wherein the upper stabilizing guides (25.1) are provided on a top side of the base frame (20) and the lower stabilizing guides (25.2) are provided on an inside side of the base frame (20), and / or the upper stabilizing guides (25.1) are open and the lower stabilizing guides (25.2) are closed.

4. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact thatthe central lifting and stowing guide (70) has a curved track (71), and / or the curved track (71) is semicircular or substantially semicircular, and / or the central lifting and stowing guide (70) has several webs (72), wherein in particular several webs (72) are made of wood.

5. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact that the guide element (55) of the head element (50) is designed at least as a roller (51) or as a sliding element (52), and / or the sliding element (52) is designed as a sliding roller, a sliding block or a nonwoven element.

6. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact that the support surface (75) of the central lifting and storage guide (70) is made of plastic, metal or wood.

7. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact thatthe contact surface (75) has a coating.

8. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact that the base frame (20) and the backrest (30) form a unit with a back panel (23), and / or the back panel (23) has a reinforcement (24) in certain areas.

9. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact that the seat element (40) has support rollers (45).

10. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact that the upholstered furniture (100) has at least one stabilizing and tensioning strap (36) with a first end and a second end, wherein the first end is attached to the head element (50) and the second end is attached to the base frame (20).

11. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact thatthe upholstered furniture (100) has at least one armrest (80) which can be attached to the left and / or right side of the upholstered furniture (100).

12. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact that the joint mechanism (60) has at least one axis of rotation, preferably several axes of rotation.

13. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact that the motor (10) is designed as an electric motor, in particular an electric rotary motor, wherein in particular the motor (10) has a self-locking effect.

14. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact that the upholstered furniture (100) has a movement mechanism (15), wherein the movement mechanism (15) is coupled to the motor (10) and the seat element (40).

15. Extendable upholstered furniture (100) according to one of the preceding claims, characterized by the fact thatthe movement mechanism (15) comprises a gearbox, a chain drive or a belt drive.

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