Seat frame and sofa assembly

Abstract

A seat frame (100) and a sofa assembly. The seat frame (100) comprises a back plate (1), a first side wall (2), and a second side wall (3), wherein the first side wall (2) and the second side wall (3) are both arranged in a length direction (D1); in a width direction (D2) perpendicular to the length direction (D1), the back plate (1) is connected between the first side wall (2) and the second side wall (3) and near rear ends of the first side wall (2) and the second side wall (3); and the back plate (1), the first side wall (2), and the second side wall (3) are selected from one or more of a blow-molded member, an injection-molded member, an extrusion-molded member, and a wood plastic member. As compared with traditional wooden frames, the total number of components can be reduced by manufacturing components of the seat frame by means of blow molding, injection molding, extrusion molding, or wood-plastic processes. Moreover, the manufacturing process can rely on industrial automatic production, and therefore, the produced components often have relatively high consistency.

Description

Seat frames and sofa components Technical Field

[0001] The present invention relates to a seat frame and a sofa assembly, in particular to a seat frame used on a sofa. Background Art

[0002] Sofas are an essential piece of furniture in people's daily lives. With the development of society and the improvement of both material and spiritual well-being, people are increasingly valuing the user-friendly design and aesthetics of sofas. However, traditional wooden sofas typically consist of multiple wooden boards assembled to form the frame supporting the main body of the sofa. These boards are connected using nail guns, making the installation process rather cumbersome. Because the wooden frame consists of numerous and dispersed components, it requires a large number of skilled workers to complete the assembly. This is a time-consuming and labor-intensive process, resulting in low production efficiency and high labor costs. Furthermore, because the shapes and structures of the boards may vary, the production process requires individual drawings and layouts for each board, which are then processed according to the layout. This results in low efficiency and high costs for sofa board manufacturing. Furthermore, when the sofa is multi-row or modular, the installation and fastening of adjacent sofa components is often complex.

[0003] Therefore, it is necessary to improve the structure of the traditional sofa in the prior art, especially to improve the frame of the traditional wooden sofa, so as to simplify the manufacturing and assembly process of the frame, improve the aesthetics of the frame, and improve production efficiency and reduce production costs.

[0004] Summary of the Invention

[0005] The object of the present invention is to provide a seat frame to simplify the manufacturing and assembly process of the seat frame, improve the aesthetics of the frame, and improve production efficiency and lower production costs.

[0006] According to one aspect of the present invention, a seat frame is provided, which includes a back panel, a first side wall and a second side wall, the first side wall and the second side wall are both arranged along the length direction, and the back panel is connected between the first side wall and the second side wall at the rear end near the first side wall and the second side wall along the width direction perpendicular to the length direction; the back panel, the first side wall and the second side wall are selected from one or more of blow molding parts, injection molding parts, extrusion parts and wood plastic parts.

[0007] According to the above solution, compared with traditional wooden frames, the total number of parts can be reduced by manufacturing the various components of the seat frame through blow molding, injection molding, extrusion molding, or wood plastic molding. Moreover, the manufacturing process can be automated through industrial production, so the produced parts are often more consistent.

[0008] In one embodiment, the seat frame further includes at least one first connecting member and at least one second connecting member that can be detachably connected, the at least one first connecting member being arranged on the first outer side surface of the first side wall, and the at least one second connecting member being arranged on the second outer side surface of the second side wall opposite to the at least one first connecting member.

[0009] According to the above solution, by providing detachably connected first and second connectors on the side walls of the seat frames, two adjacent seat frames can be quickly connected and disconnected. Therefore, when assembling a sofa with multiple seat frames, the first and second connectors can be easily connected to complete the splicing of the two adjacent seat frames.

[0010] In one embodiment, embedded nuts are further provided in the first side wall and the second side wall, and the embedded nuts are used to install the first connecting member or the second connecting member.

[0011] According to the above solution, by pre-placing the embedded nuts in the preform, the first and second sidewalls can be directly obtained with the embedded nuts at the end of the processing. The embedded nuts are integrally formed with the first or second sidewall, eliminating the need to create separate threaded holes in the first or second sidewall, which would compromise the structural integrity of the first or second sidewall, thereby ensuring and improving the overall strength of the first and second sidewalls. Furthermore, the embedded nuts reduce the number of parts required for seat frame assembly, thereby reducing the complexity of the assembly process, improving assembly efficiency, and lowering labor costs.

[0012] In one embodiment, the first connecting member includes a bottom plate and a connecting piece, the bottom plate is fixed to the first outer surface of the first side wall, the connecting piece is fixed to the bottom plate, and a cavity for accommodating the second connecting member is formed between the bottom plate and the connecting piece.

[0013] In one embodiment, the bottom plate is in a flat plate shape, and the connecting piece is in a smoothly transitioned bent shape.

[0014] In one embodiment, the connecting piece is provided with a notch for receiving the second connecting member.

[0015] In one embodiment, the notch has a locking groove and a sliding groove.

[0016] In one embodiment, the second connecting member includes a fastener connected to the second side wall, and the fastener is configured to slide along the sliding groove and reach the locking groove.

[0017] In one embodiment, the connecting piece further has a stop portion.

[0018] According to the above-described solutions, by providing detachably connected first and second connectors on the sidewalls of the seat frames, respectively, two adjacent seat frames can be quickly connected and disconnected. Therefore, when assembling a sofa with multiple seat frames, the connection between the two adjacent seat frames can be easily completed by sliding the fasteners of the second connector into the sliding slots and locking slots of the first connector. Furthermore, once the fasteners are securely connected, the stopper located above the fasteners of the first connector prevents the fasteners from accidentally disengaging from the locking slots.

[0019] In one embodiment, the first side wall has a first fixing portion.

[0020] In one embodiment, the first fixing portion is a recessed portion.

[0021] In one embodiment, the second side wall has a second fixing portion.

[0022] In one embodiment, the second fixing portion is a recessed portion.

[0023] In one embodiment, a shaping piece is further provided in the recess, and the shaping piece has a contour matching the recess.

[0024] In one embodiment, the first side wall and the second side wall further have other recesses.

[0025] According to the above-mentioned solutions, recesses are provided at the positions where the first side wall and the second side wall are connected to the main structure of the sofa or at other positions, which can strengthen the structural strength of the first side wall and the second side wall at these positions and effectively prevent the hollow cavities of the first side wall and the second side wall from being deformed or even broken after being subjected to force.

[0026] Before the shaping sheet was installed, the connection between the first or second side wall and the main structure of the sofa was typically achieved by bolts passing directly through the recess. In this case, the main structure of the sofa would directly apply shear force to the connection point of the recess, which is usually the mounting hole for allowing the bolt to pass through. As a result, the mounting hole may break under the direct action of the shear force. However, in the exemplary embodiment provided by the present invention, a shaping sheet is also provided in the recess. The shaping sheet can effectively support the contour of the recess and convert the shear force originally exerted on the connection between the recess and the main structure of the sofa into a component force distributed along the contour of the recess. This can effectively protect the recess and thereby reduce or avoid the risk of fracture at the connection point of the recess.

[0027] In one embodiment, the first and second ends of the back panel are provided with protrusions, the first end of the first side wall is provided with a first receiving portion that can be clipped with the protrusion on the first end of the back panel, and the first end of the second side wall is provided with a second receiving portion that can be clipped with the protrusion on the second end of the back panel.

[0028] According to the above solution, the back panel is connected to the first and second side walls via matching protrusions and receiving portions, simplifying the installation process. Simply snapping the protrusions into place with the receiving portions is sufficient, allowing for quick and secure installation even by untrained personnel. This connection method simplifies the structure of the back panel, first and second side walls, reducing production costs and improving efficiency. Furthermore, the connection between the back panel, first and second side walls eliminates the need for fasteners such as screws, improving the product's aesthetics while reducing component costs.

[0029] In one embodiment, the back plate is further provided with a card slot.

[0030] In one embodiment, the back plate is further provided with a decorative cover, and the decorative cover is configured to be able to be engaged with the card slot at an edge.

[0031] In one embodiment, the slot has an opening and at least one protrusion located inside the opening.

[0032] In one embodiment, the decorative cover has a clip strip configured to be engageable with the at least one protrusion.

[0033] According to the above-mentioned solutions, by providing a slot on the back panel and a clip strip on the decorative cover, the decorative cover can be easily mounted on the back panel to partially wrap or cover the back panel. Furthermore, the slot is provided with a protrusion that can engage with the clip strip, thereby ensuring that the decorative cover is securely mounted on the back panel.

[0034] In one embodiment, the seat frame further includes a support beam disposed between the first side wall and the second side wall.

[0035] According to another aspect of the present invention, a sofa assembly is provided, which includes the seat frame described in any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] To better understand the above and other objects, features, advantages, and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. Like reference numerals in the accompanying drawings refer to like components. Those skilled in the art should understand that the accompanying drawings are intended to illustrate preferred embodiments of the present invention by way of illustration and are not intended to limit the scope of the present invention. The components in the drawings are not drawn to scale.

[0037] FIG1 is a perspective view of a seat frame according to an exemplary embodiment of the present invention;

[0038] FIG2 is another perspective view of the seat frame according to the exemplary embodiment of the present invention;

[0039] FIG3 is a front view of a back plate of a seat frame according to an exemplary embodiment of the present invention;

[0040] 4 is a cross-sectional view of a back plate of a seat frame according to an exemplary embodiment of the present invention;

[0041] FIG5 is a partial enlarged view of region G in FIG4 ;

[0042] 6 is a perspective view of a back plate with a decorative cover of a seat frame according to an exemplary embodiment of the present invention;

[0043] 7 is a cross-sectional view of a back plate with a decorative cover of a seat frame according to an exemplary embodiment of the present invention;

[0044] FIG8 is a partial enlarged view of area H in FIG7;

[0045] 9 is a perspective view of a first side wall of a seat frame according to an exemplary embodiment of the present invention;

[0046] FIG10 is a perspective view of a second side wall of a seat frame according to an exemplary embodiment of the present invention;

[0047] FIG11 is a partial enlarged view of area E in FIG1 ;

[0048] FIG12 is a partial enlarged view of region F in FIG2 ;

[0049] 13 is a perspective view of a first connector of a seat frame according to an exemplary embodiment of the present invention;

[0050] 14 is a top view of a first connector of a seat frame according to an exemplary embodiment of the present invention;

[0051] 15 is a perspective view of a second connecting member of a seat frame according to an exemplary embodiment of the present invention;

[0052] FIG16 is a perspective view of a first side wall of a seat frame according to an exemplary embodiment of the present invention;

[0053] FIG17 is a perspective view of a second side wall of the seat frame of an exemplary embodiment of the present invention;

[0054] 18 is a right side view of the first side wall of the seat frame of an exemplary embodiment of the present invention;

[0055] 19 is a partial cross-sectional view of a first side wall of a seat frame according to an exemplary embodiment of the present invention;

[0056] FIG20 is a perspective view of a shaped piece of a seat frame according to an exemplary embodiment of the present invention;

[0057] 21 is a left side view of the second side wall of the seat frame of an exemplary embodiment of the present invention;

[0058] 22 is a partial cross-sectional view of the second side wall of the seat frame of an exemplary embodiment of the present invention;

[0059] 23 is a left side view of the first side wall of the seat frame of an exemplary embodiment of the present invention;

[0060] 24 is a partial cross-sectional view of a first side wall of a seat frame according to an exemplary embodiment of the present invention;

[0061] 25 is a right side view of the second side wall of the seat frame of an exemplary embodiment of the present invention;

[0062] 26 is a partial cross-sectional view of a second side wall of a seat frame according to an exemplary embodiment of the present invention.

[0063] Explanation of the reference numerals: 100 – seat frame 1 – back plate 11 – first end of back plate 12 – second end of back plate 13 – protrusion 14 – hole 15 – reinforcing rib 16 – slot 161 – opening 162 – protrusion 17 – decorative cover 171 – decorative cover body 172 – clip strip 2 – first side wall 21 – first end of first side wall 22 – second end of first side wall 23 – first receiving portion 24 – first inner surface 25 – first outer surface 26 – first fixing portion 27 – first fixing groove 3 – second side wall 31 – first end of second side wall 32 – second end of second side wall 33 – second receiving portion 34 – second inner surface 35 – second outer surface 36 – second fixing portion 37 – second fixing groove 4 – first Connecting member 41 – bottom plate 42 – connecting piece 421 – first section 422 – second section 423 – middle section 4231 – top end of middle section 4232 – bottom end 424 of middle section – first bent portion 425 – second bent portion 426 – locking groove 4261 – first end 4262 of locking groove – second end 427 – sliding groove 4271 – first end 4272 of sliding groove – second end 428 – stopper 5 – second connecting member 51 – washer 52 – fastener 521 – head 522 – first rod 523 – second rod 524 – step portion 6 – embedded nut 7 – shaping piece 8 – supporting beam A – recess AB – recess BC – recess CD – recess D D1 – length direction D2 – width direction D3 – height direction E – area EF – area FG – area GH – area H DETAILED DESCRIPTION

[0064] Now referring to the accompanying drawings, the specific embodiments of the present invention will be described in detail. What is described here is only the preferred embodiment of the present invention. Those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and the other ways also fall within the scope of the present invention.

[0065] It should be noted that the terms "up", "down", "left", "right", "above", "below", "inside", "outside", "inner side", "outer side", "top" and "bottom" used in this document are only for the convenience of clearly describing the various exemplary embodiments provided by the present invention, and are not intended to limit or restrict the present invention.

[0066] 1 and 2 are perspective views of a seat frame 100 according to an exemplary embodiment of the present invention. As shown in the figures, the seat frame 100 includes a back plate 1, a first side wall 2, and a second side wall 3.

[0067] To facilitate description of the exemplary embodiment of the present invention, the length, width, and height of the seat frame 100 are labeled D1, D2, and D3, respectively. Furthermore, the lengths of the first and second side walls 2 and 3 are parallel to the length D1 of the seat frame 100, the length of the back panel 1 is parallel to the width D2 of the seat frame 100, and the heights of the back panel 1, the first and second side walls 2 and 3 are parallel to the height D3 of the seat frame 100.

[0068] Continuing with Figures 1 and 2 , both the first sidewall 2 and the second sidewall 3 extend along a lengthwise direction D1. Furthermore, the first sidewall 2 and the second sidewall 3 may be generally L-shaped. That is, along the lengthwise direction D1, the first sidewall 2 and the second sidewall 3 generally have a smooth portion and an elevated portion. The elevated portion is at the rear ends of the first sidewall 2 and the second sidewall 3.

[0069] The back panel 1 extends along the width direction D2. The back panel 1 is disposed between the first side wall 2 and the second side wall 3 and is connected to the rear ends of the first side wall 2 and the second side wall 3, respectively. The back panel 1, together with the first side wall 2 and the second side wall 3, encloses a space for accommodating the main structure of the sofa (not shown).

[0070] Specifically, as shown in the figure, first end 11 of back plate 1 is connected to first end 21 of first side wall 2, and second end 12 of back plate 1 is connected to first end 31 of second side wall 3. Second end 22 of first side wall 2 and second end 32 of second side wall 3 each form a free end.

[0071] The back panel 1, first side wall 2, and second side wall 3 may have a hollow cavity. They may be manufactured using a molding process. For example, the back panel 1, first side wall 2, and second side wall 3 may be selected from one or more of blow molded parts, injection molded parts, extruded parts, and wood-plastic parts. Preferably, the back panel 1, first side wall 2, and second side wall 3 are blow molded parts.

[0072] Referring now to Figures 3, 9, and 10, the back panel 1 has at least one protrusion 13 at its first end 11 and second end 12, respectively. Furthermore, the first side wall 2 and second side wall 3 have at least one first receiving portion 23 and second receiving portion 33 at their respective first ends 21 and first ends 31, respectively. The protrusion 13 and the first receiving portion 23 and second receiving portion 33 are configured to match in number and to be detachably connected to each other.

[0073] As shown in FIG3 , the protrusion 13 may be a dovetail-shaped or trapezoidal tenon. The tenon protrudes outward from the first end 11 or the second end 12 of the back panel 1 and extends along the height direction D3 over at least a portion of the back panel 1. The length of the tenon on the side away from the first end 11 or the second end 12 of the back panel 11 is greater than the length of the tenon on the side adjacent to the first end 11 or the second end 12 of the back panel 11.

[0074] As shown in Figures 9 and 10, the first receiving portion 23 and the second receiving portion 33 may be grooves that match the shape of the tenon. The grooves are formed on the first inner surface 24 of the first side wall 2 or the second inner surface 34 of the second side wall 3, and extend inward from the first inner surface 24 or the second inner surface 34 into the interior of the first side wall 2 or the second side wall 3. Furthermore, the grooves extend along the height direction D3 over at least a portion of the first side wall 2 or the second side wall 3.

[0075] In addition, those skilled in the art should understand that, when the back panel 1 and the first side wall 2 and the second side wall 3 can be matched with each other and detachably connected to each other, the protrusion 13 can also be a groove, and correspondingly, the first receiving portion 23 and the second receiving portion 33 can also be a tenon.

[0076] Connecting the back panel 1 to the first and second side walls 2 and 3 through matching tenons and grooves simplifies the installation process. Simply snapping the tenons and grooves into place allows for quick and secure installation, even by untrained personnel. The simple and reliable tenon-and-groove connection structure simplifies the structure of the back panel 1, first and second side walls 2 and 3, reducing production costs and improving efficiency. Furthermore, the connection between the back panel 1, first and second side walls 2 and 3 eliminates the need for fasteners such as screws, improving the product's aesthetics while reducing component costs.

[0077] Furthermore, compared to traditional wooden frames, the blow molding process can reduce the total number of components of the seat frame 100. Furthermore, the manufacturing process can be automated by industrial production, so the components produced tend to have a high degree of consistency.

[0078] Returning to Figures 1 to 3, the back panel 1 may also be provided with a hole 14 and a reinforcing rib 15. The hole 14 extends from the inner surface of the back panel 1 to its outer surface, forming a hole 14 that passes through the thickness direction of the back panel 1. The hole 14 is used to mount the sofa's power switch. The reinforcing rib 15 may extend along the width direction D2 over at least a portion of the back panel 1 to strengthen the structural strength of the back panel 1. Furthermore, the reinforcing rib 15 may extend along the height direction D3 or extend at an angle to the width direction D2 or the height direction D3. As an example, as shown in the figure, the hole 14 is provided near the second end 12 of the back panel 1 and is substantially located in the center of the back panel 1 along the height direction D3. The back panel 1 also has three reinforcing ribs 15 extending along the width direction D2. Two of the reinforcing ribs 15 are located near the upper and lower sides of the back panel 1, respectively, and extend from near the first end 11 of the back panel 1 to near the second end 12 of the back panel 1. The third reinforcing rib 15 is aligned with the hole 14 in the width direction D2 and extends from near the first end 11 of the back plate to a position close to the hole 14 .

[0079] As shown in Figures 3 to 5 , a slot 16 may also be provided on the lower edge of the backplate 1. Figure 5 is a partially enlarged view of area G in Figure 4 . The slot 16 may extend along the width direction D2 over at least a portion of the lower edge of the backplate 1. For example, as shown, the slot 16 extends along the width direction D2 from near the first end 11 of the backplate 1 to near the second end 12 of the backplate 1. The slot 16 intersects the lower edge of the backplate 1 to form an opening 161 of the slot 16. The slot 16 then continues to slope downward into the interior of the backplate 1 at an angle to the height direction D3. Viewed from the width direction D2, the slot 16 forms a cavity with a generally rectangular cross-section. Within the opening 161 of the slot 16, at least one protrusion 162 may be provided extending from the inner wall. Multiple protrusions 162 may be evenly distributed along the inner wall along the width direction D2. Preferably, each protrusion 162 may have a wedge shape. That is, the height of each protrusion 162 protruding from the inner wall gradually increases from the opening of the slot 16 toward the inside of the slot 16 .

[0080] As shown in Figures 6 to 8, Figure 8 is a partially enlarged schematic view of area H in Figure 7. The back panel 1 may also be provided with a decorative cover 17 that partially encloses the back panel 1. The decorative cover 17 comprises a decorative cover body 171 and a retaining strip 172. The retaining strip 172 is disposed on a side edge of the decorative cover body 171. The retaining strip 172 has a hook-shaped engaging portion. The engaging portion is configured to engage with and engage with a plurality of protrusions 162 when the edge of the decorative cover 17 with the retaining strip 172 is inserted into the retaining slot 16. Providing the retaining slot 16 on the back panel 1 and the retaining strip 172 on the decorative cover 17 facilitates installation of the decorative cover 17 on the back panel 1, partially enclosing or covering the back panel 1. Furthermore, the retaining slot 16 also includes a protrusion 162 that engages with the retaining strip 172, thereby ensuring that the decorative cover 17 is securely mounted on the back panel 1.

[0081] Now referring to Figures 1, 2, 11, and 12, Figure 11 is a partial enlarged view of area E in Figure 1, and Figure 12 is a partial enlarged view of area F in Figure 2. The first sidewall 2 and the second sidewall 3 have a first outer surface 25 and a second outer surface 35, respectively. Furthermore, the seat frame 100 may further include at least one first connecting member 4 disposed on the first outer surface 25, and at least one second connecting member 5 disposed on the second outer surface 35 and opposite to the first connecting member 4. The first connecting members 4 and the second connecting members 5 are configured to match in number and to be detachably connected to each other. The first connecting members 4 and the second connecting members 5 may be secured to the first sidewall 2 and the second sidewall 3, respectively, by, for example, threading, riveting, or bonding.

[0082] In an exemplary embodiment of the present invention, there may be two first connectors 4. The two first connectors 4 are disposed at the same height of the first sidewall 2 along the height direction D3 and are located near the first end 21 and the second end 22 of the first sidewall 2, respectively.

[0083] The first connector 4 can include a base plate 41 and a connecting piece 42. The base plate 41 is fixed to the first outer surface 25, and the connecting piece 42 is fixed to the base plate 41. The base plate 41 can be flat, and the connecting piece 42 can be smoothly curved. Thus, a cavity is formed between the base plate 41 and the connecting piece 42 for accommodating the second connector 5.

[0084] Specifically, as shown in Figures 11, 13, and 14, the connecting piece 42 may include a first section 421, a second section 422, and a middle section 423 located therebetween. The first section 421 and the second section 422 are coplanar, while the middle section 423 is convex relative to the first and second sections 421, 422. The ends of the middle section 423 extend obliquely toward the first and second sections 421, 422, respectively, and connect to the ends of the first and second sections 421, 422, forming a first bend 424 and a second bend 425 located between the middle section 423 and the first and second sections 421, 422. When the connecting piece 42 is secured to the base plate 41, the middle section 423, the first bend 424, and the second bend 425 of the connecting piece 42 together form a cavity for accommodating the second connector 5.

[0085] Furthermore, the connecting piece 42 may be provided with a notch for receiving the second connecting member 5. Preferably, the notch may be provided on the middle section 423 of the connecting piece 42.

[0086] As shown in Figures 11 and 13, the notch may include a locking groove 426 and a sliding groove 427. Both the locking groove 426 and the sliding groove 427 extend from the outer side of the middle section 423 to the inner side thereof, forming a through-groove. The locking groove 426 also extends along the height direction D3 from a first end 4261 of the locking groove 426 to a second end 4262 thereof. The first end 4261 of the locking groove 426 is located near the bottom end 4231 of the middle section 423, while the second end 4262 of the locking groove 426 is located near the top end 4232 of the middle section 423. From the second end 4262 of the locking groove 426, the locking groove 426 continues to extend along the middle section 423 at an angle to the horizontal, thereby forming the sliding groove 427 that engages with the locking groove 426 and is inclined relative to the locking groove 426. Consequently, a stopper 428 is formed between the second end 4262 of the locking groove 426 and the top end 4232 of the middle section 423. The first end 4271 of the sliding slot 427 overlaps with the second end 4262 of the locking slot 426. The second end 4272 of the sliding slot 427 can intersect with the top end 4232 of the middle section 423, thereby forming an opening at the top end 4232 of the middle section 423 for allowing the second connector 5 to slide in. Preferably, the sliding slot 427 can extend all the way to the second bent portion 425 to form a larger opening.

[0087] The first section 421 and the second section 422 of the connecting piece 42 may also be provided with mounting holes, respectively. The bottom plate 41 may also be provided with mounting holes corresponding to the mounting holes of the connecting piece 42. When installing the first connector 4, bolts may be sequentially passed through the mounting holes of the connecting piece 42 and the bottom plate 41 to secure them to the first side wall 2.

[0088] 2 and 12 , there may be two second connecting members 5 . The two second connecting members 5 are disposed at the same height of the second side wall 3 along the height direction D3 and are located near the first end 31 and the second end 32 of the second side wall 3 , respectively.

[0089] As shown in Figures 12 and 15, the second connector 5 may include a washer 51 and a fastener 52. The fastener 52 includes, along its length, a head 521, a first rod 522, and a second rod 523. Both the first rod 522 and the second rod 523 are cylindrical in shape. The diameter of the first rod 522 is larger than that of the second rod 523. Consequently, a step 524 is formed at the junction of the first and second rods 522 and 523. When the second rod 523 passes through the inner hole of the washer 51, the step 524 can abut against the washer 51. Furthermore, at least a portion of the outer surface of the second rod 523 is threaded for connection to the second sidewall 3. The head 521 is located at the end of the first rod 522 away from the second rod 523. The head 521 may be circular, with a diameter greater than the dimensions of the locking groove 426 along the height direction D3 and the length direction D1. Alternatively, the head 521 may have an elliptical, triangular, rectangular, polygonal, or other irregular shape. In an embodiment of the present invention, the head 521 is shaped like a regular hexagon. Furthermore, the diameter of the inscribed circle of the regular hexagon is greater than the dimensions of the locking groove 426 along the height direction D3 and the length direction D1. Preferably, the head 521, the first rod 522, and the second rod 523 are coaxially disposed.

[0090] When the second connecting member 5 is installed, the gasket 51 is close to the second side wall 3, and the second rod body 523 of the fastener 52 passes through the inner hole of the gasket 51 and is threadedly connected to the second side wall 3, so that the head 521 and the first rod body 522 of the fastener 52 protrude outward from the second side wall 3 for detachable connection with the first connecting member 4 on the adjacent seat frame.

[0091] In order to better understand the detachable connection between the first connecting member 4 and the second connecting member 5 , the process of connecting the second connecting member 5 to the first connecting member 4 and removing the second connecting member 5 from the first connecting member 4 will be described exemplarily below.

[0092] When connecting the second connecting member 5 to the first connecting member 4, first, the fastener 52 of the second connecting member 5 is placed above the connecting piece 42 of the first connecting member 4, while keeping the head 521 of the fastener 52 located on the inner side of the connecting piece 42. Then, the first rod 522 of the fastener 52 is passed through the opening of the connecting piece 42 and enters the sliding groove 427. Then, the fastener 52 is slid obliquely along the sliding groove 427 to the junction of the sliding groove 427 and the locking groove 426. Finally, the fastener 52 is slid along the extension direction of the locking groove 426 to the first end 4261 of the locking groove 426, that is, to the bottom end of the notch of the connecting piece 42. At this point, the second connecting member 5 is connected in place.

[0093] The process of removing the second connecting member 5 from the first connecting member 4 is opposite to the above-mentioned connecting process, and will not be described in detail here.

[0094] By providing detachably connected first and second connectors 4 and 5 on the sidewalls of the seat frame 100, respectively, quick connection and disconnection between two adjacent seat frames 100 can be achieved. Therefore, when assembling a sofa comprising multiple seat frames 100 according to the present invention, the connection between two adjacent seat frames 100 can be easily completed by sliding the second connector 5 into the first connector 4. Furthermore, when the second connector 5 is securely attached, the stopper 428 of the first connector 4, located above the second connector 5, prevents the second connector 5 from accidentally detaching from the first connector 4. Furthermore, the head 521 of the fastener 52 is located in the cavity between the base plate 41 and the connecting piece 42. Since the diameter of the head 521 is larger than the locking groove 426 of the connecting piece 42, the head 521 also limits the movement of the second connector 5 relative to the first connector 4 along the width direction D2. Thus, a secure connection between two adjacent seat frames 100 is ensured.

[0095] In an embodiment of the present invention, as shown in Figures 16 and 17 , embedded nuts 6 may be provided in the first side wall 2 and the second side wall 3 to secure the first connecting member 4 or the second connecting member 5 to the first side wall 2 or the second side wall 3. As an example, when a blow molding process is used to manufacture the first side wall 2 and the second side wall 3, the embedded nuts 6 may be pre-placed into the parison and directly integrated into the first side wall 2 or the second side wall 3 of the finished product upon completion of the blow molding process.

[0096] As shown in Figure 16, the embedded nut 6 on the first side wall 2 is arranged in the hollow cavity of the first side wall 2 and is tightly attached to the first outer surface 25. A through hole is provided on the first outer surface 25, which is aligned with the embedded nut 6 to expose the internal threaded hole of the embedded nut 6. As shown in the figure, two embedded nuts 6 are arranged side by side near the first end 21 of the first side wall 2. Therefore, when installing the first connecting member 4, two bolts can be respectively passed through the mounting holes of the connecting piece 42 and the bottom plate 41 in sequence and threadedly connected to the embedded nuts 6, thereby fixing the first connecting member 4 to the first side wall 2. Similarly, two embedded nuts 6 are also arranged side by side near the second end 22 of the first side wall 2. The first connecting member 4 can be fixed to the first side wall 2 by two bolts that pass through the connecting piece 42 and the bottom plate 41 in sequence and threadedly connected to the embedded nuts 6.

[0097] As shown in Figure 17, the embedded nut 6 on the second side wall 3 is disposed within the hollow cavity of the second side wall 3 and is in close contact with the second outer surface 35. A through hole is formed in the second outer surface 35, aligned with the embedded nut 6 to expose the internal threaded hole of the embedded nut 6. As shown in the figure, an embedded nut 6 is disposed near the first end 31 and the second end 32 of the second side wall 3. When installing the second connector 5, the second rod 523 of the fastener 52 can be threadedly connected to each embedded nut 6 to secure the second connector 5 to the second side wall 3.

[0098] By pre-placing the embedded nuts 6 in the preform, the first and second sidewalls 2 and 3 can be directly obtained with the embedded nuts 6 at the end of the blow molding process. The embedded nuts 6 are integrally formed with the first or second sidewall 2 or 3, eliminating the need for separately threaded holes in the first or second sidewall 2 or 3, which would compromise the structural integrity of the first or second sidewall 2 or 3. This ensures and enhances the overall strength of the first and second sidewalls 2 and 3. Furthermore, the provision of the embedded nuts 6 reduces the number of parts required to assemble the seat frame 100, thereby reducing the complexity of the assembly process, improving assembly efficiency, and lowering labor costs.

[0099] In addition, the first side wall 2 may further have at least one first fixing portion 26, and the second side wall 3 may have at least one second fixing portion 36 opposite to the first fixing portion 26. The first fixing portion 26 and the second fixing portion 36 are used together to fix the seat frame 100 to the sofa main structure.

[0100] As shown in Figures 16, 18 and 19, the first side wall 2 has two first fixing portions 26, which can be spaced apart along the length direction D1 and disposed at different heights along the height direction D3.

[0101] The first fixing portion 26 can be configured to be formed by making the first outer side surface 25 of the first side wall 2 recessed toward the first inner side surface 24 and engaging with the first inner side surface 24. As shown in the figure, the first fixing portion 26 forms a recess A on the first outer side surface 25, and the recess A can have a window-shaped or "D"-shaped profile. The portion of the first inner side surface 24 corresponding to the recess A can still remain planar. Preferably, a shaping piece 7 can also be provided in the recess A. As shown in Figure 20, the shaping piece 7 can be provided with a through hole or a nut for fixing it to the first fixing portion 26 or the main structure of the sofa. The outer contour of the shaping piece 7 can match the contour of the recess A, and is used to support the recess A to strengthen the structural strength of the first fixing portion 26.

[0102] As shown in Figures 17, 21 and 22, the second side wall 3 has two second fixing portions 36, which can be arranged at intervals along the length direction of the second side wall 3. In addition, in the height direction of the second side wall 3, the two second fixing portions 36 can be arranged at different heights of the second side wall 3.

[0103] Similar to the first fixing portion 26, the second fixing portion 36 can be configured to be formed by recessing the second outer surface 35 of the second side wall 3 toward the second inner surface 34 and engaging with the second inner surface 34. The second fixing portion 36 forms a recess B on the second outer surface 35. Preferably, the recess B can have the same window-shaped or "D"-shaped profile as the recess A. The portion of the second inner surface 34 corresponding to the recess B can remain planar. Preferably, a shaping piece 7 can also be provided in the recess B.

[0104] A recess is provided at the position where the sofa main structure is connected, which can strengthen the structural strength of the first side wall 2 and the second side wall 3 at this location, and effectively prevent the hollow cavities of the first side wall 2 and the second side wall 3 from being deformed or even broken after being subjected to force.

[0105] Before the shaping sheet 7 is installed, the connection between the first side wall 2 or the second side wall 3 and the main structure of the sofa is typically achieved by bolts that pass directly through the recess. In this case, the main structure of the sofa will directly apply shear force to the connection point of the recess, which is usually the mounting hole for allowing the bolt to pass through. As a result, the mounting hole may break under the direct action of the shear force. However, in the exemplary embodiment provided by the present invention, the shaping sheet 7 is also provided in the recess. The shaping sheet 7 can effectively support the contour of the recess and convert the shear force originally exerted on the connection between the recess and the main structure of the sofa into a component force distributed along the contour of the recess. This can effectively protect the recess and thereby reduce or avoid the risk of fracture at the connection point of the recess.

[0106] In addition to the recess A and the recess B described in the above embodiment, the first side wall 2 and the second side wall 3 may further have other recesses.

[0107] As an example, the first sidewall 2 may further have at least one recess C located on its first inner surface 24. As shown in FIG23 , there are six recesses C. Two recesses C are disposed at intervals near the first end 21 of the first sidewall 2, another three recesses C are disposed at intervals in the middle portion of the first sidewall 2, and the last recess C is located near the second end 22 of the first sidewall 2.

[0108] As shown in FIG24 , the recess C can be formed by recessing the first inner surface 24 of the first sidewall 2 toward the first outer surface 25 and engaging with the first outer surface 25. Thus, the recess C forms a depression on the first inner surface 24. The recess C can have a circular profile. Those skilled in the art will appreciate that the recess C can also have other non-circular profiles, such as an elliptical, triangular, rectangular, polygonal, or other irregular shapes.

[0109] The second sidewall 3 may further include at least one recess D on its second inner surface 34. As shown in FIG25 , the number of recesses D is the same as the number of recesses C. Furthermore, the positions of the plurality of recesses D on the second sidewall 3 correspond to the positions of the recesses C on the first sidewall 2. Those skilled in the art will appreciate that the number and positions of the recesses D on the second sidewall 3 may differ from those of the recesses C on the first sidewall 2.

[0110] In Figures 25 and 26 , recess D can be formed by recessing the second inner surface 34 of the second sidewall 3 toward the second outer surface 35 and engaging with the second outer surface 35. The contour of recess D can be the same as that of recess C, that is, both have circular contours. However, the contour of recess D can also be different from that of recess C. For example, recess C can have a non-circular contour, such as an elliptical, triangular, rectangular, polygonal, or other irregular shape.

[0111] By making the inner surface of the first side wall 2 or the second side wall 3 concave toward the outer surface to form a recess C or a recess D on the inner surface, the structural strength near the recess C or the recess D can be effectively enhanced, thereby preventing the hollow cavity of the first side wall 2 or the second side wall 3 from being deformed or even broken after being subjected to force.

[0112] Furthermore, the seat frame 100 may further include a support beam 8 disposed between the first side wall 2 and the second side wall 3. As shown in Figures 1 and 2, there are two support beams 8. One support beam 8 extends from near the first end 21 of the first side wall 2 to near the first end 31 of the second side wall 3, and the other support beam 8 extends from near the second end 22 of the first side wall 2 to near the second end 32 of the second side wall 3. The two support beams 8 are parallel to each other and extend along the width direction D2.

[0113] As shown in the figure, rectangular first and second fixing grooves 27, 37 for receiving and fixing the ends of the support beam 8 are respectively provided on the first inner surface 24 and the second inner surface 34 at positions where they engage with the support beam 8. Preferably, additional fixing grooves may also be provided on the first and second outer surfaces 25, 35 at positions opposite to the first and second fixing grooves 27, 37 to accommodate screws for fixing the support beam 8 to the first side wall 2 or the second side wall 3.

[0114] In addition, the present invention also provides a sofa assembly, which includes a sofa main structure and any one of the seat frames 100 described in the above embodiments, wherein the sofa main structure is fixedly connected to the seat frame 100 .

[0115] The above description of various embodiments of the present invention is provided for the purpose of description to one of ordinary skill in the relevant art. It is not intended to exclude or limit the present invention to a single disclosed embodiment. As above, a person of ordinary skill in the field of the above teachings will understand the various substitutions and variations of the present invention. Therefore, although some alternative embodiments are specifically described, a person of ordinary skill in the art will understand or relatively easily develop other embodiments. The present invention is intended to include all substitutions, modifications and variations of the present invention described herein, as well as other embodiments that fall within the spirit and scope of the present invention described above.

Claims

1. A seat frame (100), characterized in that: The seat frame (100) comprises a back plate (1), a first side wall (2) and a second side wall (3), wherein the first side wall (2) and the second side wall (3) are both arranged along a length direction (D1), and the back plate (1) is connected between the first side wall (2) and the second side wall (3) at a rear end close to the first side wall (2) and the second side wall (3) along a width direction (D2) perpendicular to the length direction (D1); The back plate (1), the first side wall (2) and the second side wall (3) are selected from one or more of blow-molded parts, injection-molded parts, extruded parts and wood-plastic parts.

2. The seat frame (100) according to claim 1, characterized in that: The seat frame (100) further comprises at least one first connecting member (4) and at least one second connecting member (5) which can be detachably connected, wherein the at least one first connecting member (4) is arranged on the first outer side surface (25) of the first side wall (2), and the at least one second connecting member (5) is arranged on the second outer side surface (35) of the second side wall (3) opposite to the at least one first connecting member (4).

3. The seat frame (100) according to claim 2, characterized in that: Embedded nuts (6) are also provided in the first side wall (2) and the second side wall (3), and the embedded nuts (6) are used to install the first connecting member (4) or the second connecting member (5).

4. The seat frame (100) according to claim 2 or 3, characterized in that: The first connecting member (4) comprises a bottom plate (41) and a connecting piece (42); the bottom plate (41) is fixed on the first outer surface (35) of the first side wall (3); the connecting piece (42) is fixed on the bottom plate (41); a cavity for accommodating the second connecting member (5) is formed between the bottom plate (41) and the connecting piece (42).

5. The seat frame (100) according to claim 4, characterized in that: The bottom plate (41) is in the shape of a flat plate, and the connecting piece (42) is in the shape of a smoothly transitioned bend.

6. The seat frame (100) according to claim 5, characterized in that: The connecting piece (42) is provided with a notch for receiving the second connecting member (5).

7. The seat frame (100) according to claim 6, characterized in that: The notch has a locking groove (426) and a sliding groove (427).

8. The seat frame (100) according to claim 7, characterized in that: The second connecting member (5) comprises a fastener (52) connected to the second side wall (3), and the fastener (52) is configured to be able to slide along the sliding groove (427) and reach the locking groove (426).

9. The seat frame (100) according to any one of claims 5 to 8, characterized in that: The connecting piece (42) also has a stopper (428).

10. The seat frame (100) according to any one of claims 1 to 3, characterized in that: The first side wall (2) has a first fixing portion (26).

11. The seat frame (100) according to claim 10, characterized in that: The first fixing portion (26) is a recessed portion (A).

12. The seat frame (100) according to any one of claims 1 to 3, characterized in that: The second side wall (3) has a second fixing portion (36).

13. The seat frame (100) according to claim 12, characterized in that: The second fixing portion (36) is a recessed portion (B).

14. The seat frame (100) according to claim 11 or 13, characterized in that: A shaping sheet (7) is also provided in the recess (A) or the recess (B), and the shaping sheet (7) has a contour matching the recess (A) or the recess (B).

15. The seat frame (100) according to any one of claims 1 to 3, characterized in that: The first side wall (2) and the second side wall (3) also have other recessed portions (C, D).

16. The seat frame (100) according to any one of claims 1 to 3, characterized in that: The first end (11) and the second end (12) of the back plate (1) are provided with protrusions (13); the first end (21) of the first side wall (2) is provided with a first receiving portion (23) capable of being snap-fitted with the protrusion (13) on the first end (11) of the back plate (1); and the first end (31) of the second side wall (3) is provided with a second receiving portion (33) capable of being snap-fitted with the protrusion (13) on the second end (21) of the back plate (1).

17. The seat frame (100) according to any one of claims 1 to 3, characterized in that: The back plate (1) is also provided with a card slot (16).

18. The seat frame (100) according to claim 17, characterized in that: The back plate (1) is also provided with a decorative cover (17), and the decorative cover (17) is configured to be capable of being mutually engaged with the card slot (16) at an edge.

19. The seat frame (100) according to claim 18, characterized in that: The card slot (16) has an opening (161) and at least one protrusion (162) located inside the opening (161).

20. The seat frame (100) according to claim 19, characterized in that: The decorative cover (17) has a clamping strip (172), and the clamping strip (172) is configured to be capable of being clamped with the at least one protrusion (162).

21. The seat frame (100) according to any one of claims 1 to 3, characterized in that: The seat frame (100) further comprises a support beam (8), wherein the support beam (8) is arranged between the first side wall (2) and the second side wall (3).

22. A sofa assembly, comprising the seat frame (100) according to any one of claims 1 to 21.

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