Sofa armrest and sofa seat frame

Abstract

The utility model provides a sofa armrest and a sofa seat frame. The sofa armrest comprises an armrest body and a supporting plate connected to the armrest body, the armrest body and the supporting plate are hollow blow molding parts, one of the armrest body and the supporting plate is provided with a protruding structure, and the other one of the armrest body and the supporting plate is provided with a concave structure capable of being matched with the protruding structure. The convex structure and the concave structure are configured to be assembled with each other so as to enable the armrest main body to be fixedly connected with the supporting plate, the convex structure comprises a dovetail buckle, the cross section of the dovetail buckle along the transverse direction of the sofa armrest is trapezoidal, and the concave structure comprises a dovetail groove matched with the dovetail buckle. According to the scheme, the weight of the sofa can be reduced under the condition that the strength of the sofa armrests and the sofa seat frame is ensured, and the sofa can be conveniently disassembled and assembled.

Description

Technical Field

[0001] The utility model relates to a sofa armrest and a sofa seat frame. Background Art

[0002] The main structure of existing sofas (such as sofa armrests or the seat frame at the bottom of the sofa) is usually made of wood or metal. Taking the sofa armrest as an example, in order to provide users with sufficient support, the sofa armrest is mostly made of solid wood or a metal frame, and in order to increase the stability of the installation, the various components are often connected together by screws or welding. This not only increases the overall weight of the sofa, but also makes it inconvenient to move the sofa and disassemble and assemble the components.

[0003] Therefore, it is necessary to provide a sofa armrest and a sofa seat frame to at least partially solve the above problems. Utility Model Content

[0004] The utility model provides a sofa armrest and a sofa seat frame, which can solve the problems of low production efficiency and difficult assembly of sofas made of wood or metal materials in the prior art.

[0005] The utility model provides a sofa armrest on one hand. The sofa armrest comprises an armrest body and a support plate connected to the armrest body, the armrest body and the support plate are both constructed as hollow blow-molded parts, one of the armrest body and the support plate is provided with a protruding structure, and the other of the armrest body and the support plate is provided with a concave structure capable of cooperating with the protruding structure, the protruding structure and the concave structure are constructed to be able to be assembled with each other so that the armrest body is fixedly connected to the support plate,

[0006] Wherein, the protruding structure includes a dovetail buckle, the cross section of the dovetail buckle along the transverse direction of the sofa armrest is trapezoidal, and the recessed structure includes a dovetail groove capable of cooperating with the dovetail buckle.

[0007] Preferably, the armrest body has a first facing side facing the support plate, the support plate has a second facing side facing the armrest body, the protruding structure is arranged on one of the first facing side and the second facing side, and the recessed structure is arranged on the other of the first facing side and the second facing side.

[0008] Preferably, the protruding structure includes a protruding portion, and the concave structure includes a concave portion matching the shape of the protruding portion.

[0009] Wherein, the protrusion includes a first boss, the cross-section of the first boss along the transverse direction of the sofa armrest is trapezoidal, the first boss has a first side and a second side opposite to the first side, the spacing between the first side and the second side gradually increases along the protruding direction toward the protruding portion, and the recessed portion includes a first groove that can cooperate with the first boss.

[0010] Preferably, the recessed portion has an introduction port located on a bottom edge of the other of the first facing side and the second facing side.

[0011] Preferably, the protruding structure includes two recessed portions symmetrically arranged relative to the longitudinal center line of the armrest body and two protruding portions corresponding to the two recessed portions.

[0012] Preferably, the distance between the first side edge and the second side edge gradually increases in a direction from the top to the bottom of the sofa armrest.

[0013] Preferably, the protruding portion further includes a second boss disposed below the first boss, and an outer surface of the first boss and an outer surface of the second boss are located in the same plane.

[0014] Preferably, the first boss and the second boss are formed integrally.

[0015] Preferably, the second boss has a third side and a fourth side, the spacing between the third side and the fourth side gradually decreases along the protruding direction toward the protruding portion, and the recessed portion includes a second groove arranged below the first groove and capable of cooperating with the second boss.

[0016] Preferably, the protruding portion is provided with a first snap-on, the first snap-on is arranged on the outer surface of the first boss, the first snap-on has a first snap-on surface, the first snap-on surface extends transversely to the first side edge and the first side edge, and the recessed portion is provided with a second snap-on capable of cooperating with the first snap-on, the second snap-on is arranged on the outer surface of the first groove, the second snap-on has a second snap-on surface, and when the protruding portion and the recessed portion are assembled together, the second snap-on surface abuts against the first snap-on surface at the bottom.

[0017] Preferably, the protruding structure also includes an additional protruding portion, the cross-section of the additional protruding portion along the transverse direction of the sofa armrest is trapezoidal, and the recessed structure also includes an additional recessed portion capable of cooperating with the additional protruding portion, the additional protruding portion is arranged above the protruding portion, and the additional recessed portion is arranged above the recessed portion.

[0018] Preferably, the protruding structure includes two additional protruding portions, which are arranged on both sides of the two protruding portions in the transverse direction of the sofa armrest, and the recessed structure includes two additional recessed portions corresponding to the positions of the two additional protruding portions.

[0019] Preferably, the distance between the two side edges of the additional protrusion gradually increases along the direction from the top to the bottom of the sofa armrest.

[0020] Preferably, the additional recessed portion includes a first recessed area and a second recessed area located below the first recessed area and connected to the first recessed area, the shape of the first recessed area matches the shape of the additional protruding portion, and the width of the second recessed area along the transverse direction of the sofa armrest is greater than the width of the first recessed area along the transverse direction.

[0021] The utility model provides a sofa seat frame on the other hand. The sofa seat frame includes a back plate and a side plate connected to the back plate, the back plate and the side plate are both hollow blow-molded parts, one of the back plate and the side plate is provided with a recessed part, the other of the back plate and the side plate is provided with a protrusion matching the shape of the recessed part, the protrusion and the recessed part are configured to be assembled with each other so that the side plate is fixedly connected to the back plate,

[0022] Wherein, the protrusion is configured as a dovetail buckle, the cross section of the protrusion along the transverse direction of the sofa seat frame is trapezoidal, the protrusion has a first side and a second side opposite to the first side, the spacing between the first side and the second side gradually increases along the protruding direction toward the protruding portion, and the recessed portion is configured as a dovetail groove capable of cooperating with the dovetail buckle.

[0023] Preferably, the side plate includes a first side plate and a second side plate respectively connected to both ends of the rear plate.

[0024] Preferably, the side plate has a first facing side facing the rear plate, the rear plate has a second facing side facing the side plate, the recess is arranged on the first facing side or the second facing side and has an introduction port located on the bottom edge of the first facing side or the second facing side.

[0025] Preferably, the side plate comprises a side plate body and a bending portion arranged perpendicular to the side plate body, and the first facing side is arranged on the bending portion.

[0026] Preferably, the distance between the first side edge and the second side edge gradually increases along a direction from the top to the bottom of the sofa seat frame.

[0027] Preferably, the sofa seat frame further comprises a pin reinforcement member, wherein the pin reinforcement member extends through the bent portion and the rear plate to fasten the bent portion and the rear plate together.

[0028] Preferably, the protruding portion is provided with a first buckle, the first buckle is arranged on the outer surface of the protruding portion, the first buckle has a first engaging surface, the first engaging surface extends transversely to the first side edge and the second side edge, and the recessed portion is provided with a second buckle capable of cooperating with the first buckle, the second buckle is arranged on the outer surface of the recessed portion, the second buckle has a second engaging surface, and when the protruding portion and the recessed portion are assembled together, the second engaging surface abuts against the first engaging surface at the bottom

[0029] The sofa armrest and sofa seat frame according to the above scheme have at least the following advantages: simple structure, easy to assemble and disassemble, and the disassembled sofa armrest or sofa seat frame is convenient for storage and transportation, which greatly saves storage and transportation space, and the above scheme can also reduce the weight of the sofa while ensuring the strength of the sofa armrest and the sofa seat frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. The same or similar reference numerals in the accompanying drawings refer to the same or similar components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0031] Figure 1 It is a three-dimensional diagram of a sofa armrest according to a preferred embodiment of the utility model.

[0032] Figure 2 for Figure 1 A three-dimensional view of the armrest body of one of the sofa armrests shown.

[0033] Figure 3 for Figure 2 A schematic diagram of one of the recessed portions of the armrest body is shown.

[0034] Figure 4 for Figure 1 A perspective view of the support plate of one of the sofa armrests shown.

[0035] Figure 5 for Figure 4 A three-dimensional view of the support plate from another angle is shown.

[0036] Figure 6 for Figure 4A schematic diagram of one of the protrusions of the support plate is shown.

[0037] Figure 7 for Figure 1 A perspective view of one of the sofa arms shown.

[0038] Figure 8 for Figure 7 A cross-sectional view of the sofa armrest shown in FIG. 1 taken along line AA.

[0039] Fig. 9 for Figure 7 A cross-sectional view of the sofa armrest shown in FIG. 1 taken along line CC.

[0040] Fig.10 It is a three-dimensional diagram of a sofa seat frame according to a preferred embodiment of the utility model.

[0041] Fig.11 for Fig.10 A perspective view of the sofa seat frame shown in after omitting one of the side panels.

[0042] Fig.12 for Fig.11 A schematic diagram of the protrusion on the back plate of the sofa seat frame shown.

[0043] Fig.13 for Fig.10 A perspective view of one of the side panels of the sofa seat frame shown in FIG.

[0044] Fig.14 for Fig.13 Schematic diagram of the recessed portion on the side panel shown. DETAILED DESCRIPTION

[0045] Below, the retaining mechanism according to the preferred embodiment of the utility model will be described in detail with reference to the accompanying drawings. It can be understood that what is given below is only the preferred embodiment of the utility model, and those skilled in the art can think of other ways to implement the utility model based on the preferred embodiment, and other ways also fall within the scope of the utility model.

[0046] First of all, it should be explained that the directional terms and positional terms in the present invention should be understood as relative directions and positions, rather than absolute directions and positions.

[0047] The following will refer to Figure 1-Figure 14 The sofa armrest and the sofa seat frame according to the preferred embodiment of the utility model are described in detail.

[0048] Figure 1-Figure 9The sofa armrest 100 according to the preferred embodiment of the utility model is shown. The sofa armrest 100 includes a left armrest 120 and a right armrest 110, and the left armrest 120 and the right armrest 110 have substantially the same structure and are mirror images of each other. Therefore, for the sake of brevity, only the structure of one of the sofa armrests 100 is described in detail below.

[0049] like Figure 1-Figure 2 as well as Figure 4-Figure 5 As shown, the sofa armrest 100 includes an armrest body 111 and a support plate 112 connected to the armrest body 111. The armrest body 111 is the main structure for supporting the user's arm. It has a roughly inverted L-shaped structure, mainly composed of a vertical plate and a horizontal plate connected above the vertical plate and roughly perpendicular to the vertical plate. The center of the horizontal plate is slightly bent downward relative to its two ends to make the user's arm more comfortable when placed on it. Preferably, the vertical plate and the horizontal plate are integrally formed. The connecting portion between the vertical plate and the horizontal plate can be in an arc shape with a natural transition. Further preferably, the armrest body 111 is a hollow plastic part formed by a blow molding process. This solution can reduce the weight of the armrest body 111 while ensuring the hardness and strength of the armrest body 111.

[0050] like Figure 4 and Figure 5 As shown, the support plate 112 is generally configured as a flat plate, which is connected to the vertical plate below the horizontal plate of the armrest body 111. Preferably, the support plate 112 is also a hollow plastic part formed by a blow molding process, so that the weight of the support plate 112 can be reduced while ensuring the hardness and strength of the support plate 112.

[0051] like Figure 2-Figure 6 As shown, a plurality of protruding structures are provided on the support plate 112, and a plurality of recessed structures are provided at positions corresponding to the protruding structures on the armrest body 111, and the protruding structures can be cooperatively assembled into the recessed structures to connect the armrest body 111 to the support plate 112. It can be understood that in other embodiments not shown, the positions of the protruding structures and the recessed structures can also be reversed, that is, the recessed structures can be provided on the support plate 112, and the protruding structures can be provided on the armrest body 111.

[0052] The armrest body 111 has a first facing side 111a facing the support plate 112 in the assembled state, and the support plate 112 has a second facing side 112a facing the armrest body 111 in the assembled state. In the illustrated embodiment, the recessed structure is provided on the first facing side 111a and is recessed inwardly from the first facing side 111a, and the protruding structure is provided on the second facing side 112a and protrudes outwardly substantially perpendicularly to the second facing side 112a.

[0053] In a preferred embodiment, the protruding structure includes a protruding portion 114 disposed in the lower area of ​​the support plate 112, and the recessed structure includes a recessed portion 113 disposed in the lower area of ​​the armrest body 111. The shape of the protruding portion 114 matches the shape of the recessed portion 113, and the protruding portion 114 can be matched to the recessed portion 113 to connect the armrest body 111 to the support plate 112. Figure 2 As shown, the recessed portion 113 is further provided with an introduction port 113a located on the bottom edge of the first facing side 111a. During assembly, the protrusion 114 on the support plate 112 can be assembled into the recessed portion 113 on the armrest body 111 via the introduction port 113a.

[0054] Further references Figure 4-Figure 8 Preferably, the protrusion 114 includes a first boss 115, the cross section of the first boss 115 cut along the horizontal direction of the armrest body 111 is trapezoidal, the first boss 115 has a first side 115a and a second side 115b, the first side 115a is opposite to the second side 115b, and the distance between the first side 115a and the second side 115b gradually increases along the direction protruding toward the protrusion 114, so that the cross section of the first boss 115 is roughly trapezoidal. Figure 2-Figure 3 as well as Figure 8 As shown, the recessed portion 113 includes a first groove 117, the shape of the first groove 117 matches the shape of the first boss 115, and the first boss 115 can be fitted to the first groove 117. The mutual cooperation between the first boss 115 and the first groove 117 can prevent the armrest body 111 from lateral shedding from the support plate 112.

[0055] In order to further improve the stability of the connection between the armrest body 111 and the support plate 112, preferably, as Figure 2 As shown, two recessed portions 113 are provided on the first facing side 111a of the armrest body 111. Figure 4 and Figure 5 As shown, two protrusions 114 corresponding to the number of recesses 113 are provided on the second facing side 112a of the support plate 112. Further preferably, the two recesses 113 on the armrest body 111 are arranged roughly symmetrically with respect to the longitudinal center line of the armrest body 111. And the two protrusions 114 on the support plate 112 are arranged roughly symmetrically with respect to the longitudinal center line of the support plate 112. It should be noted that the "longitudinal" mentioned in this article refers to the height direction of the armrest body or the sofa seat frame, and accordingly, the "longitudinal center line" refers to the center line extending in the height direction of the armrest body or the sofa seat frame. It can be understood that in other embodiments not shown, other numbers of recesses 113 or protrusions 114, such as three, four or more, may also be provided on the armrest body 111 or the support plate 112.

[0056] like Figure 4-Figure 6 as well as Fig. 9 As shown, preferably, the protrusion 114 also includes a second boss 116 arranged below the first boss 115. The outer surface of the first boss 115 and the outer surface of the second boss 116 are located in the same plane. The protrusion method of the second boss 116 is different from that of the first boss 115. Specifically, the second boss 116 has a third side 116a and a fourth side 116b, and the distance between the third side 116a and the fourth side 116b gradually decreases along the protruding direction toward the protrusion 114, so that the two sides of the protrusion 114 respectively form a step portion 114b at the connection between the second boss 116 and the first boss 115. The first boss 115 and the second boss 116 can be formed integrally. Accordingly, as Figure 2-Figure 3 as well as Fig. 9 As shown, the recessed portion 113 includes a second groove 118 disposed below the first groove 117 and capable of cooperating with the second boss 116. By arranging the second boss 116 and the second groove 118 on the protruding portion 114 and the recessed portion 113, a certain draft angle can be formed on the support plate 112 and the armrest body 111, thereby facilitating demoulding of the support plate 112 and the armrest body 111 during the blow molding manufacturing process, thereby reducing the defective rate of the product.

[0057] In order to further strengthen the stability of the vertical connection between the armrest body 111 and the support plate 112, preferably, the protrusion 114 is further provided with a first buckle 1141, which is provided on the outer surface of the first boss 115 and protrudes outward from the outer surface. Figure 6 As described above, the first buckle 1141 has a first transition surface 1143 and a first engaging surface 1142. The distance between the first transition surface 1143 and the outer surface of the first boss 115 gradually increases along the direction from the top to the bottom of the first boss 115. The first engaging surface 1142 is connected to the bottom of the first transition surface 1143 and extends approximately transversely to the first side edge 115a and the second side edge 115b. The recessed portion 113 is provided with a second buckle 1131 that can cooperate with the first buckle 1141. The shape of the second buckle 1131 is approximately matched with the shape of the first buckle 1141. The second buckle 1131 is provided on the outer surface of the first groove 117 and is recessed inward from the outer surface. Specifically, as Figure 3The second buckle 1131 has a second transition surface 1133 and a second engaging surface 1132, the distance between the second transition surface 1133 and the outer surface of the first groove 117 gradually increases along the direction from the top to the bottom of the first groove 117, and the second engaging surface 1132 is connected to the bottom of the second transition surface 1133 and extends substantially transversely to the two side edges of the first groove 117. When the support plate 112 is installed on the armrest body 111 through the introduction port 113a on the armrest body 111, the second engaging surface 1132 of the second buckle 1131 will abut against the bottom of the first engaging surface 1142 of the first buckle 1141, thereby preventing the support plate 112 from falling off the armrest body 111.

[0058] Return to reference Figure 2 and Figure 5 In order to facilitate the mutual installation between the armrest body 111 and the support plate 112, and to enhance the tightness between the two in the connected state, preferably, the spacing between the first side 115a and the second side 115b gradually increases along the direction from the top to the bottom of the sofa armrest 100. In other words, the lateral width of the recessed portion 113 on the armrest body 111 gradually increases from top to bottom, and becomes the largest at the introduction port 113a, thereby forming an expansion form from top to bottom. Correspondingly, the protrusion 114 on the support plate 112 is also constructed so that its lateral width gradually increases from top to bottom, thereby also forming an expansion form from top to bottom. This solution allows the protrusion 114 on the support plate 112 to be assembled in the recessed portion 113 via the larger introduction port 113a below, thereby facilitating the assembly of the armrest body 111 and the support plate 112.

[0059] like Figure 2 as well as Figure 4-Figure 5 As shown, the protruding structure further includes an additional protruding portion 121 disposed above the protruding portion 114, and the cross section of the additional protruding portion 121 along the transverse direction of the sofa armrest 100 is also trapezoidal. Correspondingly, the recessed structure further includes an additional recessed portion 122 capable of being assembled with the additional protruding portion 121, and the additional recessed portion 122 is disposed above the recessed portion 113.

[0060] Preferably, the protruding structure includes two additional protruding portions 121, which are arranged on both sides of the two protruding portions 114 in the lateral direction of the sofa armrest 100, and the recessed structure also includes two additional recessed portions 122, and the positions of the two additional recessed portions 122 correspond to the positions of the two additional protruding portions 121 respectively.

[0061] Return to reference Figure 2, the additional recessed portion 122 includes a first recessed area 122a and a second recessed area 122b, and the second recessed area 122b is located below the first recessed area 122a and communicates with the first recessed area 122a. The shape of the first recessed area 122a matches the shape of the additional protrusion 121, and when the armrest body 111 and the support plate 112 are assembled, the additional protrusion 121 is assembled in the first recessed area 122a. The second recessed area 122b is roughly square, and its width along the transverse direction of the sofa armrest is greater than the width of the first recessed area 122a along the transverse direction. This solution allows the additional protrusion 121 to enter the first recessed area 122a through the second recessed area 122b during the process of sliding the support plate 112 from the introduction port 113a of the armrest body 111 to the armrest body 111, thereby facilitating the assembly of the support plate 112.

[0062] Similar to the protrusion 114, preferably, the spacing between the two side edges of the additional protrusion 121 also gradually increases from the top to the bottom of the sofa armrest 100. In other words, the lateral width of the additional protrusion 121 gradually increases from top to bottom, thereby forming an expansion form from top to bottom. This solution can enhance the connection tightness between the additional protrusion 121 and the additional recessed portion 122, thereby enhancing the tightness between the armrest body 111 and the support plate 112 in the connected state.

[0063] The following will refer to Figure 10-Figure 14 The sofa seat frame 200 according to the preferred embodiment of the present invention is described in detail.

[0064] The sofa seat frame 200 is usually arranged at the bottom of the sofa and acts as a support frame for supporting the sofa. Fig.10 As shown, the sofa seat frame 200 includes a back plate 230 and a side plate 280 connected to the back plate 230, and the side plate 280 includes a first side plate 210 and a second side plate 220 respectively connected to both ends of the back plate 230. Preferably, the back plate 230 and the two side plates are hollow plastic parts formed by a blow molding process. This solution can reduce the weight of the sofa seat frame 200 while ensuring the hardness and strength of the sofa seat frame 200.

[0065] The first side plate 210 and the second side plate 220 have substantially the same structure and are mirror images of each other. Therefore, for the sake of brevity, only the structure of the first side plate 210 is described in detail below.

[0066] In a preferred embodiment, a recessed portion 240 is provided on the first side plate 210, and a protruding portion 250 is provided at a position on the rear plate 230 corresponding to the recessed portion 240. The shape of the protruding portion 250 matches the shape of the recessed portion 240, and the protruding portion 250 can be assembled to the recessed portion 240 to connect the first side plate 210 to the rear plate 230. It can be understood that in other embodiments not shown, the positions of the protruding portion 250 and the recessed portion 240 can also be reversed, that is, the recessed portion 240 can be provided on the rear plate 230, and the protruding portion 250 can be provided on the first side plate 210.

[0067] like Figure 10-13 As shown, the first side plate 210 includes a side plate body 211 and a bent portion 212 arranged substantially perpendicular to the side plate body, the bent portion 212 having a first facing side 212a facing the rear plate 230, and the rear plate 230 having a second facing side 230a facing the bent portion 212. The recessed portion 240 is disposed on the first facing side 212a and has an introduction port 240a located on the bottom edge of the first facing side 212a, and the protruding portion 250 is disposed on the second facing side 230a. During the assembly process, the protruding portion 250 on the rear plate 230 can be assembled into the recessed portion 240 on the bent portion 212 of the first side plate 210 via the introduction port 240a.

[0068] Preferably, the protrusion 250 is configured as a dovetail buckle, that is, the cross section of the protrusion 250 cut along the transverse direction of the sofa seat frame 200 is trapezoidal, and the protrusion 250 has a first side 251 and a second side 252, the first side 251 is opposite to the second side 252, and the spacing between the first side 251 and the second side 252 gradually increases along the direction protruding toward the protrusion 250, so that the cross section of the protrusion 250 is roughly trapezoidal. The recessed portion 240 is configured as a dovetail groove, the shape of the dovetail groove matches the shape of the dovetail buckle, and the dovetail buckle can be fitted to the dovetail groove. The mutual cooperation between the dovetail buckle and the dovetail groove can prevent the first side plate 210 from lateral shedding with the rear plate 230.

[0069] In order to further strengthen the stability of the vertical connection between the first side plate 210 and the rear plate 230, preferably, the protruding portion 250 is further provided with a first buckle 2501, which is provided on the outer surface of the protruding portion 250 and protrudes outward from the outer surface. Fig.12As described, the first buckle 2501 has a first transition surface 2503 and a first engaging surface 2502. The distance between the first transition surface 2503 and the outer surface of the protrusion 250 gradually increases along the direction from the top to the bottom of the protrusion 250. The first engaging surface 2502 is connected to the bottom of the first transition surface 2503 and extends approximately transversely to the first side edge 251 and the second side edge 252. The recessed portion 240 is provided with a second buckle 2401 that can cooperate with the first buckle 2501. The shape of the second buckle 2401 is approximately matched with the shape of the first buckle 2501. The second buckle 2401 is provided on the outer surface of the recessed portion 240 and is recessed inward from the outer surface. Specifically, as Fig.14 The second buckle 2401 has a second transition surface 2403 and a second engaging surface 2402, the distance between the second transition surface 2403 and the outer surface of the recessed portion 240 gradually increases along the direction from the top to the bottom of the recessed portion 240, and the second engaging surface 2402 is connected to the bottom of the second transition surface 2403 and extends substantially transversely to the two side edges of the recessed portion 240. When the rear panel 230 is mounted on the first side panel 210 via the introduction port 240a on the first side panel 210, the second engaging surface 2402 of the second buckle 2401 will abut against the bottom of the first engaging surface 2502 of the first buckle 2501, thereby preventing the rear panel 230 from falling off from the first side panel 210.

[0070] like Figure 11-Figure 14 As shown, in order to facilitate the mutual installation between the first side plate 210 and the rear plate 230, and to strengthen the tightness of the connection between the two, preferably, the lateral width of the recessed portion 240 on the first side plate 210 gradually increases from top to bottom, and becomes the largest at the introduction port 240a to form an expansion form from top to bottom. Correspondingly, the lateral width of the protruding portion 250 on the rear plate 230 is also configured to gradually increase from top to bottom to form an expansion form from top to bottom. This solution can facilitate the protruding portion 250 on the rear plate 230 to be assembled in the recessed portion 240 via the larger introduction port 240a on the first side plate 210.

[0071] Further preferably, the sofa seat frame 200 further includes a pin reinforcement 260, which further connects the bending portion 212 of the first side panel 210 and the back panel 230. The pin reinforcement 260 extends through the bending portion 212 of the first side panel 210 and the back panel 230, so that the bending portion 212 and the back panel 230 can be more firmly connected together. In the illustrated embodiment, the pin reinforcement 260 is arranged above the protrusion 250 of the back panel 230 and the recessed portion 240 of the first side panel 210. It can be understood that in other embodiments not shown, the pin reinforcement 260 can also be arranged at other positions of the first side panel 210 or the back panel 230.

[0072] The above description of various embodiments of the present invention is provided to a person of ordinary skill in the relevant art for the purpose of description. 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 sofa armrest, characterized in that: The sofa armrest comprises an armrest body and a support plate connected to the armrest body, the armrest body and the support plate are both constructed as hollow blow-molded parts, one of the armrest body and the support plate is provided with a protruding structure, and the other of the armrest body and the support plate is provided with a concave structure capable of cooperating with the protruding structure, the protruding structure and the concave structure are constructed to be able to be assembled with each other so that the armrest body is fixedly connected to the support plate, Wherein, the protruding structure includes a dovetail buckle, the cross section of the dovetail buckle along the transverse direction of the sofa armrest is trapezoidal, and the recessed structure includes a dovetail groove capable of cooperating with the dovetail buckle.

2. The sofa armrest according to claim 1, characterized in that: The armrest body has a first facing side facing the support plate, the support plate has a second facing side facing the armrest body, the protruding structure is arranged on one of the first facing side and the second facing side, and the recessed structure is arranged on the other of the first facing side and the second facing side.

3. The sofa armrest according to claim 2, characterized in that: The protruding structure includes a protruding portion, and the concave structure includes a concave portion that matches the shape of the protruding portion. Wherein, the protrusion includes a first boss, the cross-section of the first boss along the transverse direction of the sofa armrest is trapezoidal, the first boss has a first side and a second side opposite to the first side, the spacing between the first side and the second side gradually increases along the protruding direction toward the protruding portion, and the recessed portion includes a first groove that can cooperate with the first boss.

4. The sofa armrest according to claim 3, characterized in that: The recessed portion has an introduction port located on a bottom edge of the other of the first facing side and the second facing side.

5. The sofa armrest according to claim 4, characterized in that: The protruding structure includes two recessed parts symmetrically arranged relative to the longitudinal center line of the armrest body and two protruding parts corresponding to the two recessed parts.

6. The sofa armrest according to claim 3, characterized in that: The distance between the first side edge and the second side edge gradually increases along a direction from the top to the bottom of the sofa armrest.

7. The sofa armrest according to claim 3, characterized in that: The protruding portion further includes a second boss disposed at a lower portion of the first boss, and an outer surface of the first boss and an outer surface of the second boss are located in the same plane.

8. The sofa armrest according to claim 7, characterized in that: The first boss and the second boss are formed integrally.

9. The sofa armrest according to claim 7, characterized in that: The second boss has a third side and a fourth side, and the distance between the third side and the fourth side gradually decreases along the protruding direction toward the protruding portion. The recessed portion includes a second groove arranged below the first groove and capable of cooperating with the second boss.

10. The sofa armrest according to claim 3, characterized in that: The protruding portion is provided with a first buckle, the first buckle is arranged on the outer surface of the first boss, the first buckle has a first engaging surface, the first engaging surface extends transversely to the first side edge and the first side edge, the recessed portion is provided with a second buckle capable of cooperating with the first buckle, the second buckle is arranged on the outer surface of the first groove, the second buckle has a second engaging surface, when the protruding portion and the recessed portion are assembled together, the second engaging surface abuts against the first engaging surface at the bottom.

11. The sofa armrest according to claim 5, characterized in that: The protruding structure also includes an additional protruding portion, the cross-section of the additional protruding portion along the transverse direction of the sofa armrest is trapezoidal, and the recessed structure also includes an additional recessed portion capable of cooperating with the additional protruding portion, the additional protruding portion is arranged above the protruding portion, and the additional recessed portion is arranged above the recessed portion.

12. The sofa armrest according to claim 11, characterized in that: The protruding structure includes two additional protruding parts, which are arranged on both sides of the two protruding parts in the transverse direction of the sofa armrest, and the recessed structure includes two additional recessed parts corresponding to the positions of the two additional protruding parts.

13. The sofa armrest according to claim 11, characterized in that: The distance between the two side edges of the additional protrusion gradually increases along the direction from the top to the bottom of the sofa armrest.

14. The sofa armrest according to claim 11, characterized in that: The additional recessed portion includes a first recessed area and a second recessed area located below the first recessed area and connected to the first recessed area, the shape of the first recessed area matches the shape of the additional protruding portion, and the width of the second recessed area along the transverse direction of the sofa armrest is greater than the width of the first recessed area along the transverse direction.

15. A sofa seat frame, characterized in that: The sofa seat frame comprises a back plate and a side plate connected to the back plate, the back plate and the side plate are both hollow blow-molded parts, one of the back plate and the side plate is provided with a recessed portion, the other of the back plate and the side plate is provided with a protrusion matching the shape of the recessed portion, the protrusion and the recessed portion are configured to be assembled with each other so that the side plate is fixedly connected to the back plate, Wherein, the protrusion is configured as a dovetail buckle, the cross section of the protrusion along the transverse direction of the sofa seat frame is trapezoidal, the protrusion has a first side and a second side opposite to the first side, the spacing between the first side and the second side gradually increases along the protruding direction toward the protruding portion, and the recessed portion is configured as a dovetail groove capable of cooperating with the dovetail buckle.

16. The sofa seat frame according to claim 15, characterized in that: The side plate includes a first side plate and a second side plate respectively connected to both ends of the rear plate.

17. The sofa seat frame according to claim 15, characterized in that: The side plate has a first facing side facing the rear plate, the rear plate has a second facing side facing the side plate, the recess is arranged on the first facing side or the second facing side and has an introduction port located on the bottom edge of the first facing side or the second facing side.

18. The sofa seat frame according to claim 17, characterized in that: The side plate includes a side plate body and a bending portion arranged perpendicular to the side plate body, and the first facing side is arranged on the bending portion.

19. The sofa seat frame according to claim 15, characterized in that: The distance between the first side edge and the second side edge gradually increases along a direction from the top to the bottom of the sofa seat frame.

20. The sofa seat frame according to claim 18, characterized in that: The sofa seat frame further includes a pin reinforcement member extending through the bent portion and the rear plate to fasten the bent portion and the rear plate together.

21. The sofa seat frame according to claim 15, characterized in that: The protruding portion is provided with a first buckle, which is arranged on the outer surface of the protruding portion and has a first snap-fitting surface, which extends transversely to the first side edge and the second side edge. The recessed portion is provided with a second buckle capable of cooperating with the first buckle, which is arranged on the outer surface of the recessed portion and has a second snap-fitting surface. When the protruding portion and the recessed portion are assembled together, the second snap-fitting surface abuts against the first snap-fitting surface at the bottom.

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