Base frame for a seat

Abstract

The invention relates to a base frame (2) for a piece of seating furniture, comprising a base part for setting up the base frame (2), a seat part (4) connected to the base part in a force-transmitting manner, a back part (6) articulated to the seat part (4), a foot part (8) articulated to the seat part (4), and a plurality of linear actuators (10, 12) for electrically adjusting the inclination of the seat part (4) relative to the base part, the back part (6) relative to the seat part (4), and the foot part (8) relative to the seat part (4), wherein the foot part (8) has several foot part segments and the foot part segments are movably connected to each other such that the foot part segments can be extended by means of at least one of the linear actuators (12) from a stowable length of the foot part (8), in which the foot part segments are folded and / or pushed together along a longitudinal axis of the foot part (8), to a stowable length exceeding the stowable length. Extension length of the foot section (8),in which the foot section segments are unfolded and / or pushed apart along the longitudinal axis of the foot section (8) and can be moved back and forth, characterized in that the base frame (2) has two linear actuators (10, 12) and is designed such that, on the one hand, a seat depth adjustment for setting a seat depth and, on the other hand, a heart-balance adjustment can be achieved solely by means of the two aforementioned linear actuators (10, 12).

Description

[0001] The invention is defined in claim 1 and relates to a base frame for a piece of seating furniture, comprising a base part for setting up the base frame on a mounting surface, a seat part connected to the base part in a force-transmitting manner, a back part articulated to the seat part, a foot part articulated to the seat part, and a plurality of linear actuators for electromechanically adjusting an inclination of the seat part relative to the base part, an inclination of the back part relative to the seat part, and an inclination of the foot part relative to the seat part, wherein the linear actuators are connected to a control unit of the base frame in a signal-transmitting and energy-transmitting manner and to a remainder of the base frame in a force-transmitting manner, and wherein the foot part has several foot part segments and the foot part segments are movably connected to one another in such a way that the foot part segments can be moved by means of at least one of the linear actuators from a storage length of the foot part,in which the foot section segments are folded and / or pushed together along a longitudinal axis of the foot section, and can be moved back and forth into an extension length of the foot section exceeding the storage length, in which the foot section segments are unfolded and / or pushed apart along the longitudinal axis of the foot section, and wherein the base frame has two linear actuators and is designed such that, on the one hand, a seat depth adjustment for setting a seat depth on the base frame and, on the other hand, a heart-balance adjustment of the base frame can be achieved solely by means of the two aforementioned linear actuators.

[0002] The base frame is designed such that, using only the two aforementioned linear actuators, the base frame can be adjusted, in a first step, to a lounge setting with a backrest lowered further back and a seat more inclined relative to the base, compared to the seat setting, and in a second step to a lounge comfort setting with a greater second seat depth compared to the lounge setting with the first seat depth.In a third step, the base frame can be converted into a television-style position with the footrest extended relative to the seat section and within its extended length, compared to the lounge comfort position. In a fourth step, the base frame can be converted into a zero-gravity position with the backrest lowered further and the seat section inclined more steeply relative to the base section compared to the television-style position. This allows users of the equipped seating furniture to realize essential functions of the seating furniture and thus of the base frame, for example, using only two linear actuators. Furthermore, this is achieved in a very simple manner from a design and manufacturing perspective. The aforementioned parts of the base frame are thus connected to each other and can be moved relative to each other by means of the linear actuators.that the base frame, starting from its seat setting, can be moved to any of the aforementioned further settings without any additional means. This also applies, of course, in the reverse direction, i.e., when moving the base frame from its zero-gravity setting or any of the other aforementioned settings towards the seat setting of the base frame. The aforementioned lounge setting, lounge comfort setting, and television setting are intermediate positions, i.e., intermediate settings, of the base frame located between the seat setting and the zero-gravity setting.

[0003] Furthermore, the base frame is designed such that the transition of the base frame from its seat position to its lounge position is effected solely by means of a first linear actuator of the two aforementioned linear actuators, from its lounge position to its lounge comfort position solely by means of a second linear actuator of the two aforementioned linear actuators, from its lounge comfort position to its television position solely by means of the second linear actuator, and from its television position to its heart-balance position solely by means of the first linear actuator, wherein the first linear actuator is arranged to transmit force between a rear crossbar of the seat section and a front crossbar of the seat section, and the second linear actuator is arranged to transmit force between the front crossbar of the seat section and a crossbar of the foot section.In this way, a highly efficient and therefore advantageous embodiment of the base frame, requiring only two linear actuators, is presented, both in terms of circuit technology and motion sequence. Furthermore, this embodiment allows for a particularly simple and robust design and manufacturing process.

[0004] Such basic frames for seating furniture are already known in the prior art in a variety of embodiments and are referred to, among other things, as recliner chairs or TV chairs.

[0005] See, for example, DE 299 17 299 U1 and WO 2023 046 239 A1.

[0006] The object of the present invention is to improve a basic frame for a piece of seating furniture.

[0007] To solve this problem, the invention, in conjunction with the preamble of claim 1, is characterized in that the seat part has two side assemblies arranged parallel to each other and connected by means of the rear and front crossbars, wherein the base frame, in addition to the aforementioned crossbars, has a rear synchronization strut and a front synchronization strut for synchronizing the movement of individual parts of the two side assemblies, and wherein the rear synchronization strut is arranged on a coupling element of each side assembly which pivotally connects the backrest to the seat part, and the front synchronization strut is arranged on the seat part such that, in the seat position of the base frame, the front synchronization strut is arranged essentially directly adjacent to the front crossbar. Preferably, the plurality of linear actuators is designed as only the two aforementioned linear actuators.

[0008] The particular advantage of the invention lies in the improved basic frame for seating furniture. Consequently, the seating furniture equipped with this basic frame is also improved. Due to the inventive design of the basic frame for seating furniture, the construction of the seat component is, on the one hand, very simple in terms of design and manufacturing, as well as weight-saving, and on the other hand, very robust. This is ensured in particular by the two aforementioned synchronization struts and their positioning relative to the rest of the seat component, which guarantees very good synchronization of the aforementioned individual parts of the two side assemblies when the inventive basic frame is moved between the individual settings of this basic frame. Accordingly, the seat component, which is essential for the aforementioned movements, is designed to be very reliable.Furthermore, it is possible to implement, using only the two aforementioned linear actuators, both a seat depth adjustment for setting the seat depth of the base frame and a zero-balance adjustment of the base frame. It is particularly advantageous that the majority of linear actuators are designed as just the two aforementioned linear actuators. Accordingly, only two linear actuators are required to implement the individual settings of the base frame according to the invention, in particular the seat depth adjustment for setting the seat depth of the base frame and the zero-balance adjustment of the base frame. Thus, the base frame according to the invention for seating furniture can be realized with less design and manufacturing effort compared to known base frames for seating furniture.

[0009] In principle, the basic frame according to the invention can be freely selected within wide suitable limits with regard to its type, function, material, and dimensions. Similarly, the settings of the basic frame according to the invention, i.e., the movement of the basic frame into different positions with predefined positions of the individual aforementioned parts of the basic frame relative to each other, can also be freely selected within wide suitable limits.

[0010] An advantageous further development of the base frame according to the invention provides that the aforementioned settings of the base frame can be controlled separately, preferably that each of the aforementioned transitions can be executed as a continuous movement. This embodiment also has the further advantage that the desired setting of the base frame can be selected directly by a user of the base frame and the seating furniture equipped with it, for example by means of a control unit of the base frame according to the invention that is connected to the control system via a signal transmission.Furthermore, the preferred embodiment of this further development has the additional advantage that the transition from the currently existing setting of the base frame according to the invention to a future setting of the base frame according to the invention desired by the user is designed as an essentially fluid movement of the base frame according to the invention, which is therefore perceived as very pleasant by the user.

[0011] A further advantageous embodiment of the base frame according to the invention provides that the individual parts of the base frame, which are movable relative to each other, are connected to one another by means of the two linear actuators in such a way that corresponding end positions of these individual parts can be achieved by means of corresponding mechanical stops of these individual parts. Preferably, a travel range of the base frame is mechanically limited by means of the aforementioned mechanical stops. Particularly preferably, the mechanical stops of these individual parts are designed as a pairing of bolt and through-hole and / or of bolt and recess. This allows the base frame according to the invention to be moved to its respective end position in a very simple manner in terms of design, manufacturing, and circuitry.Furthermore, this improved design effectively prevents the base frame according to the invention from unintentionally exceeding its respective end position, even in the event of a malfunction. This applies particularly to the preferred embodiment of this improved design, where the travel range can be defined, i.e., limited, on one side by the seat setting and on the other side by the balance setting of the base frame according to the invention. The particularly preferred embodiment of this improved design also features mechanical stops that are very simple to implement in terms of construction and manufacturing, and are robust.

[0012] Another advantageous embodiment of the base frame according to the invention provides that the base frame is designed such that the transition from the seated position of the base frame to the zero-gravity position of the base frame, or to an intermediate position of the base frame positioned between the seated position and the zero-gravity position, is achieved in combination with a forward movement of the seat parallel to the support surface. In this way, a so-called "wall-away" function can also be implemented in the base frame according to the invention, and thus in the seating furniture equipped with it, so that the seating furniture with the base frame according to the invention can be positioned very close to a wall in its seated position without affecting the other settings of the base frame according to the invention that deviate from the seated position.This is because, when the base frame according to the invention is moved from its seat position to one of the further positions of the base frame according to the invention, in which the backrest is lowered further backward compared to the seat position, the seat is also moved forward and thus away from the aforementioned wall. The aforementioned wall-away function is also made possible, for example, solely by means of the two aforementioned linear actuators for adjusting the seat depth and, on the other hand, for realizing the zero-gravity position. According to the invention, a forward movement of a part or component of the base frame means a movement toward the foot section of the base frame, while a backward movement of a part or component of the base frame means a movement toward the back section of the base frame.Parts of the basic frame are those parts of the basic frame explicitly mentioned above, namely base part, seat part, back part, foot part, while individual parts of the basic frame are not explicitly mentioned or described.

[0013] 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. Thus, the disclosure relating to the individual aspects of the invention can always be referenced reciprocally. The drawings serve only as examples to clarify the invention and are not limiting in nature. They show: Fig. 1a - an embodiment of the base frame according to the invention in four different views, with the base frame in its seating position, Fig. 2a, b - the embodiment in two different views, with the base frame in its lounge position, Fig. 3a, b - the embodiment in two different views, with the base frame in its lounge comfort position, Fig. 4a, b - the embodiment in two different views, with the base frame in its television position, Fig. 5a, b - the embodiment in two different views, with the base frame in its zero-gravity position, Fig. 6a-c - the embodiment in a perspective view and two corresponding detail views, with the base frame in its seating position, Fig.7a, b the embodiment in a perspective view with the base frame in its seated position and in a corresponding perspective detail view of a slide part, Fig. 8a-d the embodiment in a perspective view with the base frame in its seated position and three corresponding detail views, Fig. 9a-g the embodiment in a perspective view with the base frame in its seated position and six corresponding detail views, Fig. 10a-d the embodiment in a perspective view with the base frame in its seated position and three corresponding detail views, Fig. 11a-c the embodiment in a partial side view with the base frame in its seated position and two corresponding detail views, Fig.Figures 12a-c show an exemplary embodiment in a partial side view with the base frame in its lounge setting and two corresponding detail views; Figures 13a-c show an exemplary embodiment in a partial side view with the base frame in its lounge comfort setting and two corresponding detail views; Figures 14a-c show an exemplary embodiment in a partial side view with the base frame in its television setting and two corresponding detail views; and Figures 15a-c show an exemplary embodiment in a partial side view with the base frame in its zero-gravity setting and two corresponding detail views.

[0014] In the Fig. 1a bis 15c An embodiment of the basic frame according to the invention for a piece of seating furniture is shown purely as an example.

[0015] The base frame 2 for a seating furniture not shown comprises a base part (not shown) for setting up the base frame 2 on a mounting surface (also not shown), a seat part 4 connected to the base part in a force-transmitting manner, a back part 6 articulated to the seat part 4, a foot part 8 articulated to the seat part 4, and a plurality of linear actuators 10, 12 for electrically adjusting the inclination of the seat part 4 relative to the base part, the inclination of the back part 6 relative to the seat part 4, and the inclination of the foot part 8 relative to the seat part 4. The linear actuators 10, 12 are connected to a control unit of the base frame 2 (not shown) for signal and energy transmission and to a remainder of the base frame 2 for force transmission. The foot part 8 has several foot section segments (not described in detail), and the foot section segments are movably connected to each other.that the foot section segments are moved by means of at least one of the linear actuators 12 from, for example, in the , Fig. 1a the illustrated stowage length of the foot section 8, in which the foot section segments are folded and / or pushed together along a longitudinal axis of the foot section 8, into a stowage length exceeding the stowage length and, for example, in the Fig. 4a The illustrated extension length of the foot section 8, in which the foot section segments are unfolded and / or pushed apart along the longitudinal axis of the foot section 8, can be moved back and forth.

[0016] Furthermore, the base frame 2 has two linear actuators 10, 12, namely exactly two linear actuators 10, 12, wherein the base frame 2 is designed such that, on the one hand, a seat depth adjustment for setting a seat depth on the base frame 2 and, on the other hand, a [missing information] in the Fig. 5a, 5b The heart-balance setting of the base frame 2 shown is achievable. The two different seat depths adjustable by means of the aforementioned seat depth adjustment are, for example, on the one hand in the Fig. 1a, 1b and on the other hand in the Fig. 3a, 3b depicted.

[0017] The base frame 2 is designed such that the base frame 2 can be moved solely by means of the two aforementioned linear actuators 10, 12, starting from the point in the Fig. 1a bis 1d The illustrated seat setting of the base frame 2 with a first seat depth and the foot section 8 folded in relative to the seat section 4 and located within its stowable length, in a first step into a position in the Fig. 2a, 2b The lounge setting of the base frame 2, shown with a backrest 6 lowered further back compared to the seat setting and a seat section 4 inclined more steeply relative to the base, is in a second step converted into a position in the Fig. 3a, 3b The lounge comfort setting of the basic frame 2, shown here, features a second seat depth that is greater than the lounge setting with the first seat depth, and in a third step, is adjusted to a position that is... Fig. 4a, 4b The television setting of the base frame 2 is shown with a footrest 8 that is unfolded relative to the seat section 4 and is within its extended length, compared to the lounge comfort setting, and in a fourth step into a position that is in the Fig. 5a, 5b The depicted heart-balance setting of the base frame 2 can be converted to a position with a backrest 6 lowered further backwards compared to the television setting and a seat section 4 inclined more steeply relative to the base, whereby the aforementioned settings of the base frame 2 can be controlled separately, namely in such a way that each of the aforementioned conversions can be executed as a continuous movement. See here a summary of the Fig. 1a bis 5b A user of the seating unit equipped with base frame 2 (not shown) can therefore access each of the aforementioned settings of base frame 2 separately, for example, by selecting the desired setting using a control unit (not shown) that is connected to the control system via a signal transmission. Naturally, the respective setting can be accessed not only in the sequence mentioned above, but also in reverse order.The base frame 2 is additionally designed such that the transition from the seated position of the base frame 2 to the zero-gravity position of the base frame 2, or to one of the aforementioned intermediate positions of the base frame 2 positioned between the seated position and the zero-gravity position, occurs in combination with a forward movement of the seat section 4 parallel to the mounting surface, in order to simultaneously implement a so-called wall-away function for the base frame 2. See also the relevant explanations in the introductory section of the description. Fig. 2a , 3a , 4a and 5a each correspond to the Fig. 1b and the Fig. 2b , 3b , 4b and 5b correspond to each of the Fig. 1d .

[0018] The base frame 2 is further designed such that the transition of the base frame 2 from its seat position to its lounge position is carried out solely by means of the first linear actuator 10 of the two linear actuators 10, 12, from its lounge position to its lounge comfort position solely by means of the second linear actuator 12 of the two linear actuators 10, 12, from its lounge comfort position to its television position solely by means of the second linear actuator 12, and from its television position to its heart-balance position solely by means of the first linear actuator 10, wherein the first linear actuator 10 is arranged to transmit force between a rear cross member 14 of the seat section 4 and a front cross member 16 of the seat section 4, and the second linear actuator 12 is arranged to transmit force between the front cross member 16 of the seat section 4 and a cross member 18 of the foot section 8.

[0019] According to the invention, the seat part 4 of the base frame 2 has two side assemblies 20, 22 arranged parallel to each other and connected by means of the rear and front cross braces 14, 16, wherein the base frame 2, in addition to the aforementioned cross braces 14, 16, has a rear synchronization brace 24 and a front synchronization brace 26 for synchronizing a movement of individual parts of the two side assemblies 20, 22, and wherein the rear synchronization brace 24 is arranged on a coupling element 28 of each side assembly 20, 22 which pivotally connects the back part 6 to the seat part 4, and the front synchronization brace 26 is arranged on the seat part 4 such that, in the seat position of the base frame 2, the front synchronization brace 26 is arranged substantially directly adjacent to the front cross brace 16. See in particular the Fig. 6a bis 6c , the respective position of the details according to the Fig. 6b und 6c in the Fig. 6a Each is marked with a circle. In the present embodiment, the crossbars 14, 16 and the synchronization bars 24, 26 are force-transmittingly connected to a remaining part of the seat section 4 by thread-forming screws 30, i.e., self-tapping screws 30. See, for example, the Fig. 10a bis 10d , the respective position of the details according to the Fig. 10b bis 10d in the Fig. 10a Each is marked with a circle. Furthermore, each side assembly 20, 22 has a stabilizing device designed as a welded construction, comprising a stabilizing element 32 and a longitudinally movable slide element 33 for articulated connection of the seat element 4 to the foot element 8. The slide element 33 has a base body with an L-shaped cross-section extending parallel to the side assembly 20, 22, and a rectangular tube welded to this base body for mounting a scissor mechanism of the foot element 8. For bolting the slide element 33 to the corresponding scissor mechanism, the rectangular tube has a flange at its free end. See, for example, the Fig. 7a, 7b , whereby in the Fig. 7b Only one of the two slide parts 33 is shown individually. However, both stabilizing parts 32 and both slide parts 33 are each mirror-symmetrical to each other, so that the Fig. 7b This also applies to the slide part 33, which is not shown separately. The same applies to the stabilizing part 32, which is shown separately, according to the Fig. 9f und 9g .

[0020] The base frame 2 additionally features a plurality of springs (not shown) which are arranged to transmit force to individual parts of the base frame 2 that are movable relative to each other by means of the two linear actuators 10, 12, wherein the spring holders 34 required for this purpose are each formed from the corresponding individual part of the base frame 2. See, for example, the Fig. 8a bis 8d , the respective position of the details according to the Fig. 8b bis 8d in the Fig. 8a Each is marked with a circle. The spring holders 34 can, for example, be stamped out of the respective individual part, as in the present embodiment. Analogous to the aforementioned spring holders 34, the following are also present in the Fig. 8a bis 8d The side assembly 20 is formed with concealed spring holders. In the present embodiment, plate-like components of the base frame 2 are at least partially stiffened by beads 35 and / or struts 36 welded onto the respective component. See the Fig. 9a bis 9g The respective plate-like component can, for example, be deep-drawn for the purpose of producing a groove 35. Analogous to the aforementioned grooves 35 and struts 36, the following are also present in the Fig. 9a bis 9g Invisible beads and struts are formed on the individual parts of the opposite side assembly 20, 22 corresponding to the illustrated individual parts. In the present embodiment, the individual parts of the base frame 2, which are movable relative to each other by means of the two linear actuators 10, 12, are connected to each other in such a way that corresponding end positions of these individual parts can be achieved by means of corresponding mechanical stops of these individual parts, whereby a travel range of the base frame 2 is mechanically limited by means of the aforementioned mechanical stops, namely in such a way that the mechanical stops of these individual parts are designed as a pairing of, on the one hand, bolt 38 and through hole 40 and, on the other hand, bolt 42 and recess 44. See the Fig. 11a bis 11c , 12a bis 12c , 13a bis 13c , 14a bis 14c and 15a bis 15c , the respective position of the details according to the Fig. 11b und 11c , 12b and12c , 13b and 13c , 14b und 14c as well as 15b und 15c in the corresponding Fig. 11a , 12a , 13a , 14a and 15a Each is marked with a circle.

[0021] The following describes the functioning of the basic frame according to the invention and the seating furniture equipped therewith, according to the present embodiment, with reference to the Fig. 1a bis 15c briefly explained.

[0022] Initially, the base frame 2 is located in the Fig. 1a bis 1d The seat position shown is as follows, with the footrest 8 folded under the seat section 4 to its stowed length. Furthermore, the base frame 2 is in one end position of its travel range; see the figure below. Fig. 11a bis 11c The respective pistons 13, 15 of the linear actuators 10, 12 are each in a retracted position, so that the respective linear actuator 10, 12 has a stroke of 0%, i.e., 0 cm. The pistons 13, 15 and their mechanical connection with the respective crossbar 16, 18 are in the Fig. 1a bis 1d not shown. For the purpose of transferring the base frame 2, for example from its seated position to its zero-gravity position according to the Fig. 5a, 5b The user then activates the control unit of the base frame 2 (not shown) accordingly, so that initially only the first linear actuator 10 is controlled such that the piston 13 of the linear actuator 10 is extended by approximately 1 / 3 of its total stroke. The base frame 2 is in its lounge position according to the Fig. 2a, 2b and the Fig. 12a bis 12c After the base frame 2 reaches the lounge setting, the second linear actuator 12 is controlled by the controller such that the piston 15 of the second linear actuator 12 is also extended to approximately 1 / 3 of the total stroke of the linear actuator 12. The base frame 2 is in its lounge comfort setting according to the Fig. 3a, 3b and the Fig. 13a bis 13c The linear actuator 12 is then controlled by the controller such that the piston 15 of the linear actuator 12 extends further, namely until the total stroke of the linear actuator 12 is achieved. The base frame 2 is in its television setting according to the Fig. 4a, 4b and the Fig. 14a bis 14c , whereby the foot section 8 has been moved from its folded position to an unfolded position and from its stowed length to its extended length. Finally, the piston 13 of the linear actuator 10 is extended further, namely until the total stroke of the linear actuator 10 is also achieved. The base frame 2 is in its heart-balance position according to the Fig. 5a, 5b and the Fig. 15a bis 15c As can be seen from the Fig. 15a bis 15c Furthermore, it can be seen that the base frame 2 is simultaneously in its other end position of the travel range of the base frame 2.

[0023] Of course, it is not absolutely necessary to adjust the base frame 2 in the manner described above, from its seat position to its zero-gravity position. Instead, according to the present embodiment, the invention makes it possible to approach, i.e., adjust, each of the aforementioned settings of the base frame 2 analogously. Accordingly, the base frame 2 can, for example, be moved from any previous setting of the base frame 2 to any other desired setting of the base frame 2 by means of a corresponding operation on the control unit. For example, the adjustment can also be carried out in reverse order, i.e., from the zero-gravity position of the base frame 2 to its seat position. The aforementioned adjustment steps are then performed in reverse order.

[0024] The invention is not limited to the present embodiment. See, for example, the related descriptions of optional or alternative embodiments of the invention in the introductory section and in the textual explanation of the embodiment. Reference symbol list

[0025] 2 Base frame 4 Seat section of base frame 2 6 Back section of base frame 2 8 Foot section of base frame 2 10 Linear actuator 12 Linear actuator 13 Linear actuator piston 10 14 Rear crossbar of seat section 4 15 Linear actuator piston 12 16 Front crossbar of seat section 4 18 Crossbar of foot section 8 20 Side assembly of seat section 4 22 Side assembly of seat section 4 24 Rear synchronization strut 26 Front synchronization strut 28 Coupling element 30 Screw 32 Stabilizing part of side assembly 20, 22 33 Slide part of side assembly 20, 22 34 Spring holder 35 Bead 36 Welded-on strut 38 Bolt 40 Through hole 42 Bolt 44 Recess

Claims

1. Base frame (2) for a piece of seating furniture, comprising a base part for setting up the base frame (2) on a set-up area, a seat part (4) connected to the base part in a force-transmitting manner, a back part (6) connected to the seat part (4) in an articulated manner, a foot part (8) connected to the seat part (4) in an articulated manner and a plurality of linear actuators (10, 12) for the electromotive adjustment of an inclination of the seat part (4) relative to the base part, of an inclination of the back part (6) relative to the seat part (4) and of an inclination of the foot part (8) relative to the seat part (4), wherein the linear actuators (10, 12) are connected to a controller of the base frame (2) in a signal-transmitting and energy-transmitting manner and to a rest of the base frame (2) in a force-transmitting manner, and wherein the foot part (8) has several foot part segments and the foot part segments are connected to one another so as to be movable relative to one another in such a way that the foot part segments is transferable to and fro by means of at least one of the linear actuators (12) from a stowage length of the foot part (8), in which the foot part segments are folded together and / or pushed together along a longitudinal axis of the foot part (8), into an extension length of the foot part (8), which extension length exceeds the stowage length and in which the foot part segments are folded apart and / or pushed apart along the longitudinal axis of the foot part (8), and wherein the base frame (2) has two linear actuators (10, 12) and is formed in such a way that, on the one hand, a seat depth adjustment for setting a seat depth in the base frame (2) and, on the other hand, a heart balance setting of the base frame (2) can be embodied merely by means of the two aforementioned linear actuators (10, 12), specifically in such a way that the base frame (2) is formed in such a way that, starting from a seat setting of the base frame (2) with a first seat depth and foot part (8) folded in relative to the seat part (4) and located in the stowage length thereof, the base frame (2) is transferable merely by means of the two aforementioned linear actuators (10, 12), in a first step, into a lounge setting of the base frame (2) with a back part (6) lowered further to the rear in comparison to the seat setting and seat part (4) inclined more strongly relative to the base part, in a second step, into a lounge comfort setting of the base frame (2) with a second seat depth greater in comparison to the lounge setting with the first seat depth, in a third step, into a television setting of the base frame (2) with a foot part (8) folded out in comparison to the lounge comfort setting relative to the seat part (4) and located in the extension length thereof, and in a fourth step, into a heart balance setting of the base frame (2) with a back part (6) lowered further to the rear in comparison to the television setting and seat part (4) inclined more strongly relative to the base part, wherein the base frame (2) is formed in such a way that the transfer of the base frame (2) from its seat setting into its lounge setting is effected merely by means of a first linear actuator (10) of the two aforementioned linear actuators (10, 12), from its lounge setting into its lounge comfort setting merely by means of a second linear actuator (12) of the two aforementioned linear actuators (10, 12), from its lounge comfort setting into its television setting merely by means of the second linear actuator (12), and from its television setting into its heart balance setting merely by means of the first linear actuator (10), and wherein the first linear actuator (10) is arranged in a force-transmitting manner between a rear cross-bar (14) of the seat part (4) and a front cross-bar (16) of the seat part (4) and the second linear actuator (12) is arranged in a force-transmitting manner between the front cross-bar (16) of the seat part (4) and a cross-bar (18) of the foot part (8), characterized in that the seat part (4) has two side assemblies (20, 22) which are arranged parallel to one another and are connected by means of the rear and the front cross-bar (14, 16), wherein the base frame (2) has, in addition to the aforementioned cross-bars (14, 16), a rear synchronization bar (24) and a front synchronization bar (26) for synchronizing a movement of individual parts of the two side assemblies (20, 22), and wherein the rear synchronization bar (24) is arranged on a coupling element (28) of each side assembly (20, 22), which coupling element connects the back part (6) to the seat part (4) in an articulated manner, and the front synchronization bar (26) is arranged on the seat part (4) in such a way that the front synchronization bar (26) is arranged substantially directly adjacent to the front cross-bar (16) in the seat setting of the base frame (2).

2. Base frame (2) according to claim 1, characterized in that the aforementioned settings of the base frame (2) can be controlled separately, preferably in that the respective aforementioned transfer can be carried out as a continuous movement.

3. Base frame (2) according to claim 1 or 2, characterized in that the cross-bars (14, 16) and the synchronization bars (24, 26) are connected to a rest of the seat part (4) in a force-transmitting manner by means of self-tapping screws (30).

4. Base frame (2) according to any of claims 1 to 3, characterized in that the respective side assembly (20, 22) has a stabilizing device formed as a welded construction with a stabilizing part (32) and a carriage part (33) guided longitudinally movable with respect thereto for the articulated connection of the seat part (4) to the foot part (8), preferably in that the respective carriage part (33) has a basic body which runs parallel to the side assembly (20, 22) with an L-shaped cross section and a rectangular tube welded to this basic body for holding a scissors mechanism of the foot part (8).

5. Base frame (2) according to any of claims 1 to 4, characterized in that the base frame (2) has a plurality of springs which are arranged in a force-transmitting manner on individual parts of the base frame (2) movable with respect to one another by means of the two aforementioned linear actuators (10, 12), wherein spring holders (34) of these individual parts which are required for this purpose are formed in each case from the corresponding individual part of the base frame (2).

6. Base frame (2) according to any of claims 1 to 5, characterized in that plate-like individual parts of the base frame (2) have in each case a bead (35) and / or a bar (36) welded onto the respective individual part.

7. Base frame (2) according to any of claims 1 to 6, characterized in that individual parts of the base frame (2) movable with respect to one another by means of the two aforementioned linear actuators (10, 12) are connected to one another in such a way that end positions of these individual parts which correspond to one another can be embodied by means of mechanical stops of these individual parts which correspond to one another, preferably in that a travel range of the base frame (2) is mechanically limited by means of the aforementioned mechanical stops, particularly preferably in that the mechanical stops of these individual parts are formed as a pairing of bolt (38) and through-hole (40) and / or of bolt (42) and recess (44).

8. Base frame (2) according to any of claims 1 to 7, characterized in that the base frame (2) is formed in such a way that the transfer from the seat setting of the base frame (2) into the heart balance setting of the base frame (2) or an intermediate setting of the base frame (2) positioned between the seat setting and the heart balance setting is effected in combination with a forward movement of the seat part (4) parallel to the set-up area.

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