Sofa iron stand with compact structure

Abstract

The utility model discloses a sofa iron stand with a compact structure. The iron stand comprises two supporting plates which are arranged in a bilateral symmetry mode and two stretching assemblies which are symmetrically installed on the supporting plates. The supporting plate comprises a horizontal supporting panel and a supporting side plate perpendicular to the lower portion of the supporting panel. The supporting side plate is sequentially provided with a first leg hinge point, a second leg hinge point, a first supporting hinge point and a second supporting hinge point from the front end to the rear end. The stretching assembly comprises a leg assembly arranged at the front end of the supporting plate, a transmission connecting rod assembly arranged in the middle of the supporting plate and a backrest assembly arranged at the rear end of the supporting plate. The secondary transmission connecting rod is arranged on the inner side of the supporting side plate, and the mounting side plate, the first transmission connecting rod set and the second transmission connecting rod set are arranged on the outer side of the supporting side plate. The first transmission connecting rod set and the second transmission connecting rod set are bent, the leg assemblies and the transmission connecting rod assemblies are arranged in a partitioned mode, the space of the transmission structure is reduced, and the utilization rate of materials is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture manufacturing, in particular to a sofa iron frame with a compact structure. Background Art

[0002] Existing sofas and reclining chairs can realize the transformation of the sofa functional form through the extension component, and the push rod motor drives the driving rods on the front and rear sides to realize the shape change of the extension component, thereby obtaining different postures of the sofa iron frame.

[0003] Existing sofa iron frames, such as the utility model "A new sofa iron frame with extended seat depth" with patent application number 202222121863.7, provide a new sofa iron frame with extended seat depth that prevents the seat frame from sinking and ensures that the extension device can work smoothly.

[0004] The utility model further optimizes the iron frame by changing the placement position of the connecting rod assembly and the bending position and angle of each connecting rod, thereby further reducing the structural space of the iron frame and reducing the use of materials. Utility Model Content

[0005] The utility model aims to solve the deficiencies in the prior art and provide a sofa iron frame which reduces the transmission structure space and consumables by bending different parts of the transmission connecting rod and has a compact structure.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is: a sofa iron frame with a compact structure, comprising two left-right symmetrically arranged support plates and two sets of extension components symmetrically installed on the support plates;

[0007] The support plate comprises a horizontal support panel and a support side panel perpendicular to the support panel, wherein the support side panel is provided with a first leg hinge point, a second leg hinge point, a first support hinge point, and a second support hinge point in sequence from the front end to the rear end;

[0008] The extension assembly includes a leg assembly arranged at the front end of the support plate, a transmission connecting rod assembly arranged in the middle of the support plate, and a backrest assembly arranged at the rear end of the support plate;

[0009] The leg assembly includes a first leg link, a second leg link, a third leg link, a fourth leg link, a fifth leg link, a main footrest link, and a secondary footrest link;

[0010] The tail end of the first leg connecting rod is bent outward and hinged to the second leg hinge point;

[0011] The tail end of the second leg connecting rod is bent outward and hinged to the first leg hinge point, the head end of the second leg connecting rod is bent outward, and the upper part of the second leg connecting rod is provided with a second leg limiting groove;

[0012] The tail end of the third leg connecting rod is bent outward and hinged to the head end of the first leg connecting rod, the head end of the third leg connecting rod is bent inward, and a third leg limiting pin corresponding to the second leg limiting groove is provided on the inner side of the middle section of the third leg connecting rod;

[0013] The tail end of the fourth leg connecting rod is bent outward and hinged to the head end of the second leg connecting rod, the middle and upper section of the fourth leg connecting rod is bent outward and provided with a fourth leg hinge point, and the head end of the fourth leg connecting rod is bent inward;

[0014] The main footstool comprises a horizontal main foot panel and a main foot side panel perpendicular to the main foot panel, the tail end of the main foot side panel is hinged to the head end of the third leg connecting rod, and the lower end of the main foot side panel is hinged to the fourth leg connecting rod through the fourth leg hinge point;

[0015] The auxiliary footrest connecting rod comprises a horizontal auxiliary foot panel and an auxiliary foot side connecting rod perpendicular to the auxiliary foot panel, the tail end of the auxiliary foot side connecting rod is bent inwardly and hinged to the head end of the fourth leg connecting rod, and the middle section of the auxiliary foot side connecting rod is bent outwardly and provided with an auxiliary foot hinge point;

[0016] The fifth leg connecting rod is bent in the middle, the head end of the fifth leg connecting rod is hinged to the auxiliary leg side connecting rod through the auxiliary leg hinge point, and the tail end of the fifth leg connecting rod is hinged to the front end of the main leg side plate;

[0017] The transmission connecting rod assembly includes a mounting side plate, a main transmission side plate, a first transmission connecting rod group, and a second transmission connecting rod group;

[0018] The first transmission link group includes a first side link, a second side link, and a transmission support plate, and the transmission support plate is provided with a first transmission hinge point, a second transmission hinge point, a third transmission hinge point, and a fourth transmission hinge point in sequence from the beginning to the end;

[0019] The head end of the first side link is hinged to the supporting side plate through the second supporting hinge point, the middle of the first side link is provided with a first side connecting hinge point, and the tail end of the first side link is hinged to the transmission support plate through the second transmission hinge point;

[0020] The head end of the second side connecting rod is hinged to the supporting side plate through the first supporting hinge point, and the tail end of the second side connecting rod is hinged to the transmission support plate through the fourth transmission hinge point;

[0021] The head end of the main transmission side plate is hinged to the tail end of the first leg connecting rod, and the tail end of the main transmission side plate is hinged to the first side connecting rod through the first side connecting hinge point;

[0022] The mounting side plate is provided with a first main transmission hinge point, a second main transmission hinge point, a main transmission positioning pin, a third main transmission hinge point, and a fourth main transmission hinge point in sequence from the beginning to the end;

[0023] The second transmission connecting rod group includes a third side connecting rod, a fourth side connecting rod, a fifth side connecting rod, a sixth side connecting rod, a seventh side connecting rod, and an eighth side connecting rod;

[0024] The head end of the third side connecting rod is bent inward and hinged to the transmission support plate through the third transmission hinge point;

[0025] The head end of the fourth side connecting rod is hinged to the mounting side plate through the fourth main transmission hinge point, and the tail end of the fourth side connecting rod is bent inwardly and hinged to the tail end of the third side connecting rod;

[0026] The head end of the fifth side connecting rod is hinged to the tail end of the fourth side connecting rod, and the tail end of the fifth side connecting rod is hinged to the head end of the sixth side connecting rod;

[0027] The tail end of the sixth side connecting rod is hinged to the mounting side plate through the third main transmission hinge point, and the middle section of the sixth side connecting rod is provided with a sixth side connecting groove corresponding to the main transmission locating pin;

[0028] The head end of the seventh side connecting rod is hinged to the middle section of the fifth side connecting rod, and the tail end of the seventh side connecting rod is bent inward;

[0029] The head end of the eighth side connecting rod is hinged to the middle section of the sixth side connecting rod, the middle section of the eighth side connecting rod is hinged to the tail end of the seventh side connecting rod, and the tail end of the eighth side connecting rod is bent inward and hinged to the transmission support plate through the first transmission hinge point;

[0030] The backrest assembly comprises a backrest mounting plate, a backrest supporting plate, a backrest fixing plate, a first backrest connecting rod and a second backrest connecting rod.

[0031] Preferably, the second leg connecting rod is hinged to a front drive rod bending piece, and the front drive rod bending piece is hinged to a front motor drive rod.

[0032] Preferably, the backrest mounting plate is respectively hinged to the backrest support plate and the backrest fixing plate, the backrest fixing plate is fixed to the supporting side plate, the first backrest connecting rod is respectively hinged to the backrest support plate, the backrest fixing plate and the second backrest connecting rod, and the second backrest connecting rod is hinged to the mounting side plate through the first main transmission hinge point.

[0033] Preferably, the mounting side plate is hinged with a rear drive rod bending piece through a second main transmission hinge point, and the rear drive rod bending piece is fixedly connected with a rear motor drive rod.

[0034] Preferably, the main transmission side plate is located on the inner side of the supporting side plate in both the moving state and the non-moving state.

[0035] Preferably, the installation side plate, the first transmission link group and the second transmission link group are all located on the outside of the supporting side plate in a moving state or a non-moving state.

[0036] Preferably, the leg assembly is located on the inner side of the supporting side plate in both the moving state and the non-moving state.

[0037] Compared with the prior art, the utility model has the following advantages: through the cooperation of the first transmission connecting rod group, the second transmission connecting rod group, the installation side plate and the main transmission side plate, the sixth side connecting rod, the seventh side connecting rod, the eighth side connecting rod and the main transmission locating pin are staggered and combined in the same space, and the third side connecting rod and the fourth side connecting rod are staggered and combined in the same space, thereby reducing the structural space of the iron frame; the fixation of the auxiliary footrest connecting rod and the main footrest connecting rod is enhanced by the fifth leg connecting rod and the third leg locating pin, so that the leg assembly is more secure after being extended; the secondary transmission connecting rod is arranged on the inner side of the supporting side plate, and the installation side plate, the first transmission connecting rod group and the second transmission connecting rod group are arranged on the outer side of the supporting side plate, so that the leg assembly and the transmission connecting rod assembly of the sofa iron frame are arranged in a smaller structural space when the sofa iron frame is in a sitting state. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a first structural schematic diagram of the utility model in a lying state.

[0039] Figure 2 It is a structural schematic diagram of the support plate in the utility model.

[0040] Figure 3 It is a structural schematic diagram of the utility model in the TV posture state.

[0041] Figure 4 It is a first structural schematic diagram of the support plate and the transmission connecting rod assembly in the utility model.

[0042] Figure 5 This is a second structural schematic diagram of the support plate and the transmission connecting rod assembly in the utility model.

[0043] Figure 6 It is a second structural schematic diagram of the utility model in a lying state.

[0044] Figure 7 It is a structural schematic diagram of the utility model in a sitting state.

[0045] Among them, 1-support plate, 11-support panel, 12-support side plate, 13-first leg hinge point, 14-second leg hinge point, 15-first support hinge point, 16-second support hinge point, 2-extension component, 21-leg component, 211-first leg connecting rod, 212-second leg connecting rod, 2121-second leg limiting groove, 213-third leg connecting rod, 2131-third leg limiting pin, 214-fourth leg connecting rod, 21 41-the fourth leg hinge point, 215-the fifth leg connecting rod, 216-the main footrest connecting rod, 2161-the main foot panel, 2162-the main foot side panel, 217-the auxiliary footrest connecting rod, 2171-the auxiliary foot panel, 2172-the auxiliary foot side connecting rod, 2173-the auxiliary foot hinge point, 218-the front drive rod bending part, 22-the transmission connecting rod assembly, 221-the installation side panel, 222-the main transmission side panel, 2231-the first side connecting rod, 2232-the second side connecting rod, 2233-third side connecting rod, 2234-fourth side connecting rod, 2235-fifth side connecting rod, 2236-sixth side connecting rod, 2237-seventh side connecting rod, 2238-eighth side connecting rod, 224-first transmission connecting rod group, 225-first transmission connecting rod group, 226-transmission support plate, 227-main transmission positioning pin, 228-sixth side connecting groove, 2291-first transmission hinge point, 2292-second transmission hinge point, 2293-third transmission hinge Contact point, 2294-fourth transmission hinge point, 2295-first main transmission hinge point, 2296-second main transmission hinge point, 2297-third main transmission hinge point, 2298-fourth main transmission hinge point, 23-backrest assembly, 231-backrest mounting plate, 232-backrest support plate, 233-backrest fixing plate, 234-first backrest connecting rod, 235-second backrest connecting rod, 236-drive rod bending part, 3-front motor drive rod, 4-rear motor drive rod. DETAILED DESCRIPTION

[0046] The present invention is further explained below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that these implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0047] like Figures 1 to 7 The sofa iron frame with a compact structure shown comprises two support plates 1 arranged symmetrically on the left and right and two sets of extension components 2 symmetrically mounted on the support plates 1;

[0048] The support plate 1 includes a horizontal support panel 11 and a support side panel 12 perpendicular to the bottom of the support panel 11, and the support side panel 12 is provided with a first leg hinge point 13, a second leg hinge point 14, a first support hinge point 15, and a second support hinge point 16 in sequence from the front end to the rear end; the extension assembly 2 includes a leg assembly 21 provided at the front end of the support plate 1, a transmission connecting rod assembly 22 provided in the middle of the support plate 1, and a backrest assembly 23 provided at the rear end of the support plate 1;

[0049] The leg assembly 21 includes a first leg link 211, a second leg link 212, a third leg link 213, a fourth leg link 214, a fifth leg link 215, a main footrest link 216, and a secondary footrest link 217; the tail end of the first leg link 211 is bent outward and hinged to the second leg hinge point 14; the tail end of the second leg link 212 is bent outward and hinged to the first leg hinge point 13, the head end of the second leg link 212 is bent outward, and the upper part of the second leg link 212 is provided with a second leg The second leg connecting rod 212 is hinged with a front drive rod bending piece 236218, and the front drive rod bending piece 236218 is hinged with a front motor driving rod 3; the tail end of the third leg connecting rod 213 is bent outward and hinged to the head end of the first leg connecting rod 211, the head end of the third leg connecting rod 213 is bent inward, and the inner side of the middle section of the third leg connecting rod 213 is provided with a third leg limiting pin 2131 corresponding to the second leg limiting groove 2121; the tail end of the fourth leg connecting rod 214 is bent outward and hinged to the second leg The head end of the connecting rod 212, the middle and upper section of the fourth leg connecting rod 214 is bent outward and provided with a fourth leg hinge point 2141, and the head end of the fourth leg connecting rod 214 is bent inward; the main footrest includes a horizontal main foot panel 2161 and a main foot side panel 2162 perpendicular to the main foot panel 2161, the tail end of the main foot side panel 2162 is hinged to the head end of the third leg connecting rod 213, and the lower end of the main foot side panel 2162 is hinged to the fourth leg connecting rod 214 through the fourth leg hinge point 2141; the auxiliary footrest connecting rod 217 includes A horizontal auxiliary foot panel 2171 and an auxiliary foot side connecting rod 2172 perpendicular to the auxiliary foot panel 2171, the tail end of the auxiliary foot side connecting rod 2172 is bent inwardly and hinged to the head end of the fourth leg connecting rod 214, the middle section of the auxiliary foot side connecting rod 2172 is bent outwardly and is provided with an auxiliary foot hinge point 2173; the middle of the fifth leg connecting rod 215 is bent, the head end of the fifth leg connecting rod 215 is hinged to the auxiliary foot side connecting rod 2172 through the auxiliary foot hinge point 2173, and the tail end of the fifth leg connecting rod 215 is hinged to the front end of the main foot side panel 2162;

[0050] The transmission connecting rod assembly 22 includes a mounting side plate 221, a main transmission side plate 222, a first transmission connecting rod group 225224, and a second transmission connecting rod group;

[0051] The first transmission link group 225224 includes a first side link 2231, a second side link 2232, and a transmission support plate 226. The transmission support plate 226 is provided with a first transmission hinge point 2291, a second transmission hinge point 2292, a third transmission hinge point 2293, and a fourth transmission hinge point 2294 in sequence from the beginning to the end; the head end of the first side link 2231 is hinged to the support side plate 12 through the second support hinge point 16, the middle of the first side link 2231 is provided with a first side connection hinge point, and the tail end of the first side link 2231 is hinged to the transmission support plate 226 through the second transmission hinge point 2292; the head end of the second side link 2232 is hinged to the support side plate 12 through the first support hinge point 15, and the tail end of the second side link 2232 is hinged to the transmission support plate 226 through the fourth transmission hinge point 2294;

[0052] The head end of the main transmission side plate 222 is hinged to the tail end of the first leg connecting rod 211, and the tail end of the main transmission side plate 222 is hinged to the first side connecting rod 2231 through the first side connecting hinge point;

[0053] The installation side plate 221 is provided with a first main transmission hinge point 2295, a second main transmission hinge point 2296, a main transmission positioning pin 227, a third main transmission hinge point 2297, and a fourth main transmission hinge point 2298 in sequence from the beginning to the end. The installation side plate 221 is hinged with a rear drive bending piece through the second main transmission hinge point, and the rear drive rod bending piece 236 is fixedly connected to the rear motor drive rod 4. The installation side plate 221 is hinged with a rear drive bending piece through the second main transmission hinge point, and the rear drive rod bending piece 236 is fixedly connected to the rear motor drive rod 4.

[0054] The second transmission link group includes a third side link 2233, a fourth side link 2234, a fifth side link 2235, a sixth side link 2236, a seventh side link 2237, and an eighth side link 2238; the head end of the third side link 2233 is bent inwardly and is hinged to the transmission support plate 226 through a third transmission hinge point 2293; the head end of the fourth side link 2234 is hinged to the mounting side plate 221 through a fourth main transmission hinge point 2298, and the tail end of the fourth side link 2234 is bent inwardly and hinged to the tail end of the third side link 2233; the head end of the fifth side link 2235 is hinged to the tail end of the fourth side link 2234, and the tail end of the fifth side link 2235 is hinged to the sixth side link 2238; The head end of the side link 2236 is hinged; the tail end of the sixth side link 2236 is hinged to the mounting side plate 221 through the third main transmission hinge point 2297, and the middle section of the sixth side link 2236 is provided with a sixth side connection groove 228 corresponding to the main transmission positioning pin 227; the head end of the seventh side link 2237 is hinged to the middle section of the fifth side link 2235, and the tail end of the seventh side link 2237 is bent inwardly; the head end of the eighth side link 2238 is hinged to the middle section of the sixth side link 2236, and the middle section of the eighth side link 2238 is hinged to the tail end of the seventh side link 2237, and the tail end of the eighth side link 2238 is bent inwardly and hinged to the transmission support plate 226 through the first transmission hinge point 2291;

[0055] The backrest assembly 23 includes a backrest mounting plate 231, a backrest support plate 232, a backrest fixing plate 233, a first backrest connecting rod 234, and a second backrest connecting rod 235. The backrest mounting plate 231 is respectively hinged to the backrest support plate 232 and the backrest fixing plate 233. The backrest fixing plate 233 is fixed to the supporting side plate 12. The first backrest connecting rod 234 is respectively hinged to the backrest support plate 232, the backrest fixing plate 233, and the second backrest connecting rod 235. The second backrest connecting rod 235 is hinged to the mounting side plate 221 through the first main transmission hinge point 2295.

[0056] The moving state or non-moving state of the main transmission side plate 222 is located on the inner side of the supporting side plate 12, the moving state or non-moving state of the installation side plate 221, the first transmission connecting rod group 225224 and the second transmission connecting rod group are located on the outer side of the supporting side plate 12, and the moving state or non-moving state of the leg assembly 21 is located on the inner side of the supporting side plate 12.

[0057] The working process and principle of this embodiment are as follows: through the cooperation of the first transmission connecting rod group, the second transmission connecting rod group, the mounting side panel and the main transmission side panel, the sixth side connecting rod, the seventh side connecting rod, the eighth side connecting rod and the main transmission locating pin are staggered and combined in the same space, and the third side connecting rod and the fourth side connecting rod are staggered and combined in the same space, thereby reducing the structural space of the iron frame; the fixation of the auxiliary footrest connecting rod and the main footrest connecting rod is enhanced through the fifth leg connecting rod and the third leg locating pin, so that the leg assembly is more secure after extension; the secondary transmission connecting rod is arranged on the inner side of the supporting side panel, and the mounting side panel, the first transmission connecting rod group and the second transmission connecting rod group are arranged on the outer side of the supporting side panel, so that the leg assembly and the transmission connecting rod assembly of the sofa iron frame are arranged in a smaller structural space when the sofa iron frame is in a sitting state.

[0058] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A sofa iron frame with a compact structure, characterized by: It includes two left-right symmetrically arranged support plates and two sets of extension components symmetrically installed on the support plates; The support plate includes a horizontal support panel and a support side panel perpendicular to the support panel, wherein the support side panel is provided with a first leg hinge point, a second leg hinge point, a first support hinge point, and a second support hinge point in sequence from the front end to the rear end; The extension assembly includes a leg assembly arranged at the front end of the support plate, a transmission connecting rod assembly arranged in the middle of the support plate, and a backrest assembly arranged at the rear end of the support plate; The leg assembly includes a first leg link, a second leg link, a third leg link, a fourth leg link, a fifth leg link, a main footrest link, and a secondary footrest link; The tail end of the first leg connecting rod is bent outward and hinged to the second leg hinge point; The tail end of the second leg connecting rod is bent outward and hinged to the first leg hinge point, the head end of the second leg connecting rod is bent outward, and the upper part of the second leg connecting rod is provided with a second leg limiting groove; the tail end of the third leg connecting rod is bent outward and hinged to the head end of the first leg connecting rod, the head end of the third leg connecting rod is bent inward, and the inner side of the middle section of the third leg connecting rod is provided with a third leg limiting pin corresponding to the second leg limiting groove; The tail end of the fourth leg connecting rod is bent outward and hinged to the head end of the second leg connecting rod, the middle and upper section of the fourth leg connecting rod is bent outward and provided with a fourth leg hinge point, and the head end of the fourth leg connecting rod is bent inward; The main footstool comprises a horizontal main foot panel and a main foot side panel perpendicular to the main foot panel, the tail end of the main foot side panel is hinged to the head end of the third leg connecting rod, and the lower end of the main foot side panel is hinged to the fourth leg connecting rod through the fourth leg hinge point; The auxiliary footrest connecting rod comprises a horizontal auxiliary foot panel and an auxiliary foot side connecting rod perpendicular to the auxiliary foot panel, the tail end of the auxiliary foot side connecting rod is bent inwardly and hinged to the head end of the fourth leg connecting rod, and the middle section of the auxiliary foot side connecting rod is bent outwardly and provided with an auxiliary foot hinge point; The fifth leg connecting rod is bent in the middle, the head end of the fifth leg connecting rod is hinged to the auxiliary leg side connecting rod through the auxiliary leg hinge point, and the tail end of the fifth leg connecting rod is hinged to the front end of the main leg side plate; The transmission connecting rod assembly includes a mounting side plate, a main transmission side plate, a first transmission connecting rod group, and a second transmission connecting rod group; The first transmission link group includes a first side link, a second side link, and a transmission support plate, and the transmission support plate is provided with a first transmission hinge point, a second transmission hinge point, a third transmission hinge point, and a fourth transmission hinge point in sequence from the beginning to the end; The head end of the first side link is hinged to the supporting side plate through the second supporting hinge point, the middle of the first side link is provided with a first side connecting hinge point, and the tail end of the first side link is hinged to the transmission support plate through the second transmission hinge point; The head end of the second side connecting rod is hinged to the supporting side plate through the first supporting hinge point, and the tail end of the second side connecting rod is hinged to the transmission support plate through the fourth transmission hinge point; The head end of the main transmission side plate is hinged to the tail end of the first leg connecting rod, and the tail end of the main transmission side plate is hinged to the first side connecting rod through the first side connecting hinge point; The mounting side plate is provided with a first main transmission hinge point, a second main transmission hinge point, a main transmission positioning pin, a third main transmission hinge point, and a fourth main transmission hinge point in sequence from the beginning to the end; The second transmission connecting rod group includes a third side connecting rod, a fourth side connecting rod, a fifth side connecting rod, a sixth side connecting rod, a seventh side connecting rod, and an eighth side connecting rod; The head end of the third side connecting rod is bent inward and hinged to the transmission support plate through the third transmission hinge point; The head end of the fourth side connecting rod is hinged to the mounting side plate through the fourth main transmission hinge point, and the tail end of the fourth side connecting rod is bent inwardly and hinged to the tail end of the third side connecting rod; The head end of the fifth side connecting rod is hinged to the tail end of the fourth side connecting rod, and the tail end of the fifth side connecting rod is hinged to the head end of the sixth side connecting rod; The tail end of the sixth side connecting rod is hinged to the mounting side plate through the third main transmission hinge point, and the middle section of the sixth side connecting rod is provided with a sixth side connecting groove corresponding to the main transmission locating pin; The head end of the seventh side connecting rod is hinged to the middle section of the fifth side connecting rod, and the tail end of the seventh side connecting rod is bent inward; The head end of the eighth side connecting rod is hinged to the middle section of the sixth side connecting rod, the middle section of the eighth side connecting rod is hinged to the tail end of the seventh side connecting rod, and the tail end of the eighth side connecting rod is bent inward and hinged to the transmission support plate through the first transmission hinge point; The backrest assembly comprises a backrest mounting plate, a backrest supporting plate, a backrest fixing plate, a first backrest connecting rod and a second backrest connecting rod.

2. A sofa iron frame with a compact structure according to claim 1, characterized in that: The second leg connecting rod is hinged with a front drive rod bending piece, and the front drive rod bending piece is hinged with a front motor drive rod.

3. The sofa iron frame with a compact structure according to claim 1, characterized in that: The backrest mounting plate is respectively hinged to the backrest support plate and the backrest fixing plate, the backrest fixing plate is fixed to the supporting side plate, the first backrest connecting rod is respectively hinged to the backrest support plate, the backrest fixing plate and the second backrest connecting rod, and the second backrest connecting rod is hinged to the mounting side plate through the first main transmission hinge point.

4. The sofa iron frame with a compact structure according to claim 1, characterized in that: The mounting side plate is hinged with a rear drive rod bending piece through a second main transmission hinge point, and the rear drive rod bending piece is fixedly connected with a rear motor drive rod.

5. The sofa iron frame with a compact structure according to claim 1 is characterized in that: The main transmission side plate is located on the inner side of the supporting side plate in a moving state or a non-moving state.

6. The sofa iron frame with a compact structure according to claim 1, characterized in that: The installation side plate, the first transmission link group and the second transmission link group are all located on the outside of the supporting side plate in a moving state or a non-moving state.

7. The sofa iron frame with a compact structure according to claim 1, characterized in that: The leg assembly is located on the inner side of the supporting side plate in a moving state or a non-moving state.

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