Seat base assembly and sofa seat

Abstract

The utility model discloses a seat base assembly and a sofa seat. The seat base assembly comprises a fixed seat frame, the fixed seat frame comprises a fixed supporting mechanism, the fixed supporting mechanism comprises two symmetrically-arranged fixed supporting frames, and each fixed supporting frame comprises a fixed bearing part extending in the front-back direction and fixed supporting parts arranged on the front side and the rear side of the fixed bearing part; and the fixed seat frame mechanism comprises two cross beams which are arranged in a spaced mode, and the cross beams extend in the transverse direction and are fixedly connected between the two fixed bearing parts. According to the sofa seat, the cross beam and the fixed supporting part are directly and fixedly connected to form the closed frame structure, the overall bending resistance or torsional rigidity is remarkably enhanced, meanwhile, the ground supporting force can directly act on the closed frame structure through the fixed supporting part, and the shaking risk during rotation or state switching of the sofa seat is effectively restrained; furthermore, the whole sofa seat is more stable, the shaking phenomenon is effectively reduced, and the use experience of consumers is optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of furniture, in particular to a seat base assembly and a sofa seat. BACKGROUND

[0002] At present, the sofa base assembly is generally composed of a frame and a sofa seat frame which is detachably connected to the frame. However, whether it is a traditional solid wood frame or a modified metal frame, the detachable connection design between the frame and the sofa seat frame is a key short board. Specifically, the solid wood frame is insufficient in strength, which leads to loose connection nodes under long-term load. Although the metal frame improves rigidity, it forms multiple stress concentration points at the detachable connection interface. The core contradiction of this connection mode is that there is an irreconcilable conflict between the dynamic adaptability required by modular design and the structural stability, and there is a obvious weak point in the detachable connection. In addition, the mechanical wear in frequent disassembly and assembly and daily use (rotation or state switching) will gradually expand the connection gap, eventually causing the sofa base assembly with detachable connection to inevitably have a seat shaking problem, which seriously affects the stability of the sofa base assembly and causes poor user experience for consumers. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a seat base assembly and a sofa seat, which effectively suppresses the shaking risk of the sofa seat in daily use, thereby making the whole sofa seat more stable, effectively reducing the occurrence of shaking phenomenon, and optimizing the user experience of consumers.

[0004] In order to achieve the above-mentioned purpose, the utility model discloses a seat base assembly, which comprises a fixed seat frame, wherein the fixed seat frame comprises: a fixed support mechanism, the fixed support mechanism comprises two symmetrically arranged fixed support frames, the fixed support frame comprises a fixed supporting part extending along the front-back direction and a fixed support part arranged on the front and back sides of the fixed supporting part, and the fixed support part is used for supporting on the ground; a fixed seat frame mechanism, the fixed seat frame mechanism comprises two spaced apart cross beams, the cross beam extends along the transverse direction, and the cross beam is fixedly connected between the two fixed supporting parts.

[0005] As an optional implementation, the fixed supporting part and the fixed support part are integrally formed.

[0006] As an optional implementation, at least one of the fixed support frames is connected with an armrest fixed support; the armrest fixed support comprises at least one first armrest fixed plate, the first armrest fixed plate is fixedly connected to the fixed supporting part, and the upper and lower ends of the first armrest fixed plate are provided with first armrest fixed parts.

[0007] As an optional implementation, the handrail fixing support further comprises at least one second handrail fixing plate, the second handrail fixing plate is fixedly connected to the fixing support part, and the front and rear ends of the second handrail fixing plate are provided with second handrail fixing parts.

[0008] As an optional implementation, the rear baffle support comprises a rear beam extending in the transverse direction, and the rear beam is fixedly connected to the rear ends of the two fixing support frames.

[0009] As an optional implementation, the sofa further comprises a splicing mechanism for splicing two adjacent fixing seat frames, the splicing mechanism comprises: a first splicing buckle, the first splicing buckle is arranged at the rear end of the fixing support part of one of the fixing seat frames; a second splicing buckle, the second splicing buckle is arranged at the front end of the fixing support part of one of the fixing seat frames; a third splicing buckle, the third splicing buckle is arranged at the rear end of the fixing support part of the other fixing seat frame, and the third splicing buckle is used for clamping the first splicing buckle; and a fourth splicing buckle, the fourth splicing buckle is arranged at the front end of the fixing support part of the other fixing seat frame, and the fourth splicing buckle is used for clamping the second splicing buckle.

[0010] As an optional implementation, the clamping directions of the first splicing buckle and the third splicing buckle and the clamping directions of the second splicing buckle and the fourth splicing buckle are arranged in intersecting directions.

[0011] As an optional implementation, at least one of the fixing seat frames is provided with an extension mechanism, and the extension mechanism can be switched between a sitting position and a lying position.

[0012] As an optional implementation, the extension mechanism comprises a backrest support, a linkage support, a leg support and a linear electric actuator, the backrest support is rotationally connected to the rear end of the linkage support, the leg support is rotationally connected to the front end of the linkage support, the output end of the linear electric actuator is connected to the leg support, the linear electric actuator is used for driving the leg support to extend or retract, and the extension or retraction of the leg support drives the linkage support to rotate the backrest support.

[0013] Based on the same inventive concept, the application further provides a sofa seat, comprising the seat base assembly as described above.

[0014] Compared with the prior art, the sofa seat has the beneficial effects that:

[0015] The closing frame structure is formed by directly fixing and connecting the cross beam and the fixed support part, the structural weak point of the original detachable connection is eliminated, the overall bending or torsional stiffness is significantly enhanced, the ground support force can directly act on the closing frame structure through the fixed support part, the mechanical wear caused by detachable assembly is avoided, the shaking risk during the rotation or state switching of the sofa seat is effectively inhibited, and the overall sofa seat is driven to be more stable, the shaking phenomenon is effectively reduced, and the use experience of the consumer is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 is a structural schematic view of a seat base assembly (one fixed seat frame) of the present application;

[0018] Figure 2 is a structural schematic view of a seat base assembly (two fixed seat frames spliced) of the present application;

[0019] Figure 3 is another structural schematic view of a seat base assembly (two fixed seat frames spliced) of the present application;

[0020] Figure 4 is an assembly schematic view of a splicing mechanism of the present application.

[0021] Main figure mark explanation:

[0022] 1, fixed support mechanism; 11, fixed support frame; 111, fixed support part; 112, fixed support part; 12, armrest fixed support; 121, first armrest fixed plate; 122, first armrest fixed part; 123, second armrest fixed plate; 124, second armrest fixed part; 13, back plate support; 131, back beam; 2, fixed seat frame mechanism; 21, cross beam; 3, splicing mechanism; 31, first splicing buckle; 32, second splicing buckle; 33, third splicing buckle; 34, fourth splicing buckle; 4, extension mechanism; 41, backrest support; 42, linkage support; 43, leg support; 44, linear electric actuator. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0024] In the present application, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like are the directions or positional relationships shown based on the drawings. These terms are mainly used for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0025] In addition, in addition to being used to indicate directions or positional relationships, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate an attachment relationship or a connection relationship in some cases. Those skilled in the art can understand the specific meanings of these terms in the present application according to specific circumstances.

[0026] In addition, the terms "mount", "set", "provided with", "connect", "connected" should be understood broadly. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication between two devices, elements or components. Those skilled in the art can understand the specific meanings of the above-mentioned terms in the present application according to specific circumstances.

[0027] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific types and structures can be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0028] The technical solutions of the present application will be further described below with reference to the embodiments and drawings.

[0029] Embodiment one:

[0030] Please refer to Figure 1 , Figure 2 and Figure 3The embodiment of the present application provides a seat base assembly applied to a sofa seat. The seat base assembly comprises a fixed seat frame, the fixed seat frame comprises a fixed support mechanism 1 and a fixed seat frame mechanism 2, and optionally, the fixed support mechanism 1 comprises two symmetrical fixed support frames 11, the fixed support frame 11 comprises a fixed supporting part 111 extending in the front-rear direction and a fixed support part 112 arranged on the front and rear sides of the fixed supporting part 111, and the fixed support part 112 is used for supporting on the ground; the fixed seat frame mechanism 2 comprises two spaced apart cross beams 21, the cross beam 21 extends in the transverse direction, and the cross beam 21 is fixedly connected between the two fixed supporting parts 111. Preferably, the closed frame structure is formed by directly fixing and connecting the cross beam 21 and the fixed supporting part 111, the structural weak point of the original detachable connection is eliminated, the overall bending or torsional stiffness is significantly enhanced, at the same time, the ground support force can directly act on the closed frame structure through the fixed support part 112, the mechanical wear caused by detachable assembly is avoided, the shaking risk during sofa seat rotation or state switching is effectively inhibited, and then the whole sofa seat is driven to be more stable, the shaking phenomenon is effectively reduced, and the use experience of consumers is optimized.

[0031] Please refer to Figure 1 、 Figure 2 and Figure 3 In the embodiment, the fixed supporting part 111 and the fixed support part 112 are integrally formed. Optionally, the fixed support frame 11 and the cross beam 21 are made of metal material. Optionally, the fixed supporting part 111 and the fixed support part 112 are integrally bent and formed, so that the fixed support frame 11 is a continuous metal structure formed by bending, the weak nodes of traditional welding or bolt connection are eliminated, the local stress concentration caused by welding heat effect or assembly gap is avoided, the overall fatigue strength is improved, and especially under frequent dynamic load (such as seat rotation, human body shaking or state switching), the fixed support frame 11 is not easy to break; further, since the fixed supporting part 111 and the fixed support part 112 are integrally bent and formed, the intersection of the fixed supporting part 111 and the fixed support part 112 forms a circular arc transition, so that the load transmission from the fixed supporting part 111 to the fixed support part 112 is smoother, and the risk of stress mutation at the bending part is reduced.

[0032] Please refer to Figure 1 、 Figure 2 and Figure 3In the embodiment, the rear baffle support 13 is further included, which comprises a rear beam 131 extending in the transverse direction and fixedly connected to the rear ends of the two fixed support frames 11. Optionally, the rear baffle support 13 is used for assembling a rear baffle, which is used for shielding the internal mechanism of the seat base assembly, preventing foreign matters from being stuck, and avoiding mechanical failure or safety hazard. Optionally, the rear beam 131 is fixedly connected to the two fixed support portions 112 at the rear ends, so that the rear beam 131 and the two fixed support portions 112 at the rear ends are fixedly connected to form a bottom layer frame, and the upper layer frame formed by the transverse beam 21 and the fixed support portion 111 constitutes a double-layer torsion system, which further reduces the risk of shaking of the sofa seat, and further drives the whole sofa seat to be more stable.

[0033] Embodiment two:

[0034] Please refer to Figure 1 , Figure 2 and Figure 3 , the embodiment also discloses a seat base assembly applied to a sofa seat. The main difference between the seat base assembly in the embodiment and the seat base assembly in the above-mentioned embodiments is that at least one of the fixed support frames 11 is connected with an armrest fixed support 12; the armrest fixed support 12 comprises at least one first armrest fixed plate 121, the first armrest fixed plate 121 is fixedly connected to the fixed support portion 111, and the upper and lower ends of the first armrest fixed plate 121 are provided with first armrest fixed portions 122. Optionally, the armrest fixed support 12 is used for assembling an armrest, and specifically, the first armrest fixed plate 121 is fixedly connected to the fixed support portion 111 by means of bolt connection, welding and riveting, and the first armrest fixed portions 122 are fixedly connected with the armrest by means of bolt connection, welding and riveting, so as to assemble the armrest to the fixed support frame 11.

[0035] Please refer to Figure 1 , Figure 2 and Figure 3In the embodiment, the handrail fixing support 12 further comprises at least one second handrail fixing plate 123 fixedly connected to the fixing support part 112, and second handrail fixing parts 124 are arranged at the front and rear ends of the second handrail fixing plate 123. In this way, the first handrail fixing plate 121 is fixedly connected to the handrail through the first handrail fixing parts 122 at the upper and lower ends thereof, and the second handrail fixing plate 123 is fixedly connected to the handrail through the second handrail fixing parts 124 at the front and rear ends thereof, so that the handrail is fixed in multiple dimensions, the handrail is prevented from shaking up and down or swinging back and forth, and the stability of the handrail is improved. Optionally, the first handrail fixing plate 121 is fixed to the rear end of the fixing support part 112, and the second handrail fixing plate 123 is arranged on the fixing support part 112 at the front end. In this way, the first handrail fixing plate 121 is fixedly connected to the handrail through the first handrail fixing parts 122 at the upper and lower ends thereof, so that the compression resistance in the height direction is achieved, the vertical load applied by the elbow when the human body leans back is resisted, the second handrail fixing plate 123 is fixedly connected to the handrail through the second handrail fixing parts 124 at the front and rear ends thereof, so that the stop in the front and rear directions is achieved, and the horizontal shear force generated by the arm when the person gets up and supports the handrail is resisted.

[0036] Embodiment three:

[0037] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , the seat base assembly of the embodiment also comprises a splicing mechanism 3 for splicing two adjacent fixing seat frames. The splicing mechanism 3 comprises a first splicing buckle 31, a second splicing buckle 32, a third splicing buckle 33 and a fourth splicing buckle 34. The first splicing buckle 31 is arranged at the rear end of the fixing support part 111 of one of the fixing seat frames, the second splicing buckle 32 is arranged at the front end of the fixing support part 111 of one of the fixing seat frames, the third splicing buckle 33 is arranged at the rear end of the fixing support part 111 of the other fixing seat frame and is used for clamping the first splicing buckle 31, and the fourth splicing buckle 34 is arranged at the front end of the fixing support part 111 of the other fixing seat frame and is used for clamping the second splicing buckle 32.

[0038] In the embodiment, the number of the fixed seat frames is two or more than two, and a splicing mechanism 3 is arranged between two adjacent fixed seat frames to splice the two adjacent fixed seat frames with each other, so as to expand the seat base assembly. Optionally, the splicing buckles are mountain-shaped buckles, that is, the first splicing buckle 31 and the third splicing buckle 33 are mountain-shaped buckles that are mutually buckled, and correspondingly, the second splicing buckle 32 and the fourth splicing buckle 34 are mountain-shaped buckles that are mutually buckled. In this way, the two adjacent fixed seat frames can be spliced by aligning and buckling the first splicing buckle 31 and the third splicing buckle 33 and aligning and buckling the second splicing buckle 32 and the fourth splicing buckle 34, so that the splicing or separation can be quickly completed without tools, the operation process is simplified, and since the front and rear ends of the fixed supporting part 111 are provided with splicing buckles, the two independent fixed seat frames form a continuous force frame after being spliced, the overall torsion and bending resistance is improved, and asymmetric deformation during use by two people is prevented.

[0039] In the embodiment, the buckling directions of the first splicing buckle 31 and the third splicing buckle 33 and the buckling directions of the second splicing buckle 32 and the fourth splicing buckle 34 are arranged in intersecting directions. Optionally, the buckling directions of the first splicing buckle 31 and the third splicing buckle 33 are parallel to the front-rear direction, and the buckling directions of the second splicing buckle 32 and the fourth splicing buckle 34 are parallel to the height direction. In this way, the mutual buckling of the first splicing buckle 31 and the third splicing buckle 33 locks the two fixed seat frames in the height direction, and the mutual buckling of the second splicing buckle 32 and the fourth splicing buckle 34 locks the two fixed seat frames in the front-rear direction, so that the two fixed seat frames are prevented from shaking up and down or swinging back and forth, and the stability of the expanded seat base assembly is improved.

[0040] Embodiment Four

[0041] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4The embodiment also discloses a seat base assembly applied to a sofa seat. The seat base assembly in the embodiment is mainly different from the seat base assembly in the above embodiment in that at least one of the fixed seat frames is provided with an extension mechanism 4, and the extension mechanism 4 can be transformed between a sitting position and a lying position. Optionally, in the fixed seat frame without the extension mechanism 4, the rear end of the fixed supporting part 111 is fixedly connected with a back cushion, the fixed supporting part 111 is fixedly connected with a seat cushion, and the front end of the fixed supporting part 111 is fixedly connected with a foot cushion. In the fixed seat frame with the extension mechanism 4, the back cushion, the seat cushion and the foot cushion are all assembled on the extension mechanism 4, and the extension mechanism 4 can drive the back cushion, the seat cushion and the foot cushion to move synchronously when the extension mechanism 4 is transformed between the sitting position and the lying position, so that the fixed seat frame is transformed between the sitting state and the lying state. In this way, the fixed seat frame with the extension mechanism 4 and the fixed seat frame without the extension mechanism 4 are spliced, and the diversification of the seat base assembly can be realized.

[0042] In the embodiment, the extension mechanism 4 comprises a backrest support 41, a linkage support 42, a leg support 43 and a linear electric actuator 44. The backrest support 41 is rotationally connected to the rear end of the linkage support 42, the leg support 43 is rotationally connected to the front end of the linkage support 42, the output end of the linear electric actuator 44 is connected to the leg support 43, the linear electric actuator 44 is used for driving the leg support 43 to extend or retract, and the extension or retraction of the leg support 43 will drive the linkage support 42 to rotate the backrest support 41. Optionally, the linear electric actuator 44 is a driving device such as a motor or a pneumatic cylinder. The back cushion is assembled on the backrest support 41, the seat cushion is assembled on the linkage support 42, and the foot cushion is assembled on the leg support 43. In this way, when the linear electric actuator 44 drives the leg support 43 to extend or retract, the foot cushion synchronously extends or retracts, and the linkage support 42 and the backrest support 41 synchronously move under the driving of the leg support 43, so that the fixed seat frame is transformed between the sitting state and the lying state.

[0043] Embodiment five

[0044] The embodiment discloses a sofa seat, which comprises the seat base assembly in any of the above embodiments. Figure 1Optionally, the seat base assembly only includes one fixed seat frame, which is directly fixed and connected through the cross beam 21 and the fixed support part 111 to form a closed frame structure, eliminating the structural weakness of the original detachable connection, significantly enhancing the overall bending or torsional stiffness, and at the same time, the ground support force can be directly applied to the closed frame structure through the fixed support part 112, avoiding mechanical wear caused by detachable assembly, effectively suppressing the risk of shaking during sofa seat rotation or state switching, and further driving the overall sofa seat to be more stable, effectively reducing the occurrence of shaking, and optimizing the user experience; further, the fixed seat frame is provided with the fixed support frame 11 on one side or both sides in the transverse direction, the first armrest fixed plate 121 is fixed to the rear end of the fixed support part 111, and the second armrest fixed plate 123 is located on the front end of the fixed support part 112; in this way, the first armrest fixed plate 121 is fixedly connected with the armrest through the first armrest fixed part 122 at the upper and lower ends thereof, realizing compression resistance in the height direction and resisting the vertical load applied by the elbow downward when the human body leans backward, and the second armrest fixed plate 123 is fixedly connected with the armrest through the second armrest fixed part 124 at the front and rear ends thereof, constructing a front and rear stop and resisting the horizontal shear force generated by the arm pushing backward when getting up. Figure 2 、 Figure 3 and Figure 4Optionally, the seat base assembly includes two or more fixed seat frames, and the seat base assembly includes three fixed seat frames as an exemplary illustration, and for the convenience of description, the fixed seat frames are defined as fixed seat frame A, fixed seat frame B and fixed seat frame C, wherein the fixed seat frame A, the fixed seat frame B and the fixed seat frame C are arranged in sequence along the transverse direction, the first splicing buckle 31 on the side of the fixed seat frame A facing the fixed seat frame B is aligned and connected with the third splicing buckle 33 on the side of the fixed seat frame B facing the fixed seat frame A, the second splicing buckle 32 on the side of the fixed seat frame A facing the fixed seat frame B is aligned and connected with the fourth splicing buckle 34 on the side of the fixed seat frame B facing the fixed seat frame A, so as to splice the fixed seat frame A and the fixed seat frame B, then the first splicing buckle 31 on the side of the fixed seat frame B facing the fixed seat frame C is aligned and connected with the third splicing buckle 33 on the side of the fixed seat frame C facing the fixed seat frame B, and the second splicing buckle 32 on the side of the fixed seat frame B facing the fixed seat frame C is aligned and connected with the fourth splicing buckle 34 on the side of the fixed seat frame C facing the fixed seat frame B, so as to splice the fixed seat frame A, the fixed seat frame B and the fixed seat frame C into an integrated whole, thereby expanding the seat base assembly, and further, the above splicing steps can be repeated according to actual needs to continue expanding the seat base assembly, and further, when any fixed seat frame needs to be disassembled, the first splicing buckle 31 on the side of the fixed seat frame B facing the fixed seat frame C is separated from the third splicing buckle 33 on the side of the fixed seat frame C facing the fixed seat frame B, and the second splicing buckle 32 on the side of the fixed seat frame B facing the fixed seat frame C is separated from the fourth splicing buckle 34 on the side of the fixed seat frame C facing the fixed seat frame B, so as to remove the fixed seat frame C from the seat base assembly composed of the fixed seat frame A and the fixed seat frame B, and further, the above splicing steps can be repeated according to actual needs to continue removing the fixed seat frame A or the fixed seat frame B, and further, one or more of the fixed seat frame A, the fixed seat frame B and the fixed seat frame C are provided with an extension mechanism 4, so that one or more of the fixed seat frame A, the fixed seat frame B and the fixed seat frame C can be transformed between a sitting state and a lying state, thereby diversifying the expansion of the seat base assembly.

[0045] The seat base assembly and the sofa seat disclosed in the embodiments of the present application are described in detail, and the principles and implementation modes of the present application are described by applying specific examples; the above embodiment description is only used to help understand the seat base assembly and the sofa seat and the core idea thereof; meanwhile, for those skilled in the art, the specific implementation modes and application ranges will be changed according to the idea of the present application, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A seat base assembly characterized by, The fixed seat frame comprises a fixed seat frame mechanism (2) and a rear baffle support (13). The fixed seat frame mechanism (2) comprises two spaced apart cross beams (21) extending in the transverse direction, and the cross beams (21) are fixedly connected between the two fixed supporting portions (111). The fixed supporting portion (111) and the fixed supporting portion (112) are integrally formed.

2. The seat base assembly of claim 1, wherein: At least one of the fixed supporting frames (11) is connected with a handrail fixed support (12).

3. The seat base assembly of claim 1, wherein: The handrail fixed support (12) comprises at least one first handrail fixed plate (121) fixedly connected to the fixed supporting portion (111), and the upper and lower ends of the first handrail fixed plate (121) are provided with first handrail fixed portions (122). The handrail fixed support (12) further comprises at least one second handrail fixed plate (123) fixedly connected to the fixed supporting portion (112), and the front and rear ends of the second handrail fixed plate (123) are provided with second handrail fixed portions (124).

4. The seat base assembly of claim 3, wherein: The rear baffle support (13) comprises a rear beam (131) extending in the transverse direction, and the rear beam (131) is fixedly connected to the rear ends of the two fixed supporting frames (11).

5. The seat base assembly of claim 1, wherein: The fixed seat frame further comprises a splicing mechanism (3) for splicing two adjacent fixed seat frames, and the splicing mechanism (3) comprises:

6. The seat base assembly of any of claims 1-5, wherein: A first splicing buckle (31) is arranged at the rear end of the fixed supporting portion (111) of one of the fixed seat frames; A second splicing buckle (32) is arranged at the front end of the fixed supporting portion (111) of one of the fixed seat frames; A third splicing buckle (33) is arranged at the rear end of the fixed supporting portion (111) of the other fixed seat frame, and is used for clamping with the first splicing buckle (31); A fourth splicing buckle (34) is arranged at the front end of the fixed supporting portion (111) of the other fixed seat frame, and is used for clamping with the second splicing buckle (32). The clamping directions of the first splicing buckle (31) and the third splicing buckle (33) and the clamping directions of the second splicing buckle (32) and the fourth splicing buckle (34) are intersected.

7. The seat base assembly of claim 6, wherein: At least one of the fixed seat frames is provided with an extension mechanism (4) capable of being transformed between a sitting position and a lying position.

8. The seat base assembly of claim 6, wherein: ​ 9. The seat base assembly of claim 8, wherein: The stretching mechanism (4) comprises a backrest support (41), a linkage support (42), a leg support (43) and a linear electric actuating device (44), the backrest support (41) is rotatably connected to the rear end of the linkage support (42), the leg support (43) is rotatably connected to the front end of the linkage support (42), the output end of the linear electric actuating device (44) is connected with the leg support (43), the linear electric actuating device (44) is used for driving the leg support (43) to stretch or contract, and the stretching or contraction of the leg support (43) will drive the linkage support (42) to rotate the backrest support (41).

10. A sofa seat, characterized by Comprising: A seat base assembly as claimed in any of claims 1 to 9.

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