A sofa seat frame

Abstract

The present invention discloses a sofa seat frame, including a seat frame and a secondary leg support retracting mechanism installed at the front of the seat frame, the seat frame including a mounting plate, a rear transverse tube and two side plates, the two side plates are arranged opposite to each other, the front parts of the two side plates are fixedly connected by the mounting plate, the rear parts of the two side plates are fixedly connected by the rear transverse tube, the mounting plate and the rear transverse tube are arranged opposite to each other, the secondary leg support retracting mechanism includes two seat frame connecting rod mechanisms and two leg support connecting rod mechanisms, the seat frame connecting rod mechanism is hinged at the front part of the corresponding side plate, and the leg support connecting rod mechanism is hinged at the front part of the corresponding seat frame connecting rod mechanism. A sofa seat frame of the present invention is adopted, and a secondary leg support retracting mechanism is installed at the front part of the seat frame, which can reduce the distance that the driving connecting rod is advanced or retracted during the process of unfolding or retracting the leg support, and enhance the rate of unfolding or retracting the leg support. The mounting seat is graded and segmented during the adjustment process, which can reduce the space occupied by the mounting seat, and reduce the external matching space during the unfolding and retracting process, so as to make the structure more compact.

Description

Technical Field

[0001] The invention relates to a sofa accessory, in particular to a sofa seat frame. Background Art

[0002] Functional sofas are becoming more and more popular among consumers because of their various functions of leisure and soothing the human body. Existing functional sofas generally have the following functions:

[0003] 1. Rocking chair function, which provides users with functions similar to swings;

[0004] 2. Leg support function, which selectively supports the user's legs by opening or storing the leg support;

[0005] 3. The lying function allows the user to lie back by flipping the sofa backrest.

[0006] The above functions can be combined in different ways to form sofas of various configurations. In addition, the existing technology related to functional sofas is relatively mature.

[0007] However, since the use space of furniture products is relatively large, and existing sofa manufacturers generally believe that functional sofas should be made "large" to create a visual impact on consumers and thus achieve better sales. Therefore, the existing technology does not integrate multiple functions of sofas to a high degree, and the space utilization rate of the sofa frame structure needs to be improved.

[0008] When integrating the functional sofa frame to a higher degree, on the one hand, it is necessary to adjust or redesign the combination of different functions; on the other hand, it is necessary to make adaptive new designs for some structural parts. Summary of the invention

[0009] In view of this, the present invention provides a sofa seat frame which improves telescopic efficiency and reduces occupied space.

[0010] The technical solution is as follows:

[0011] A sofa seat frame, the key of which is that it comprises a seat frame and a secondary leg support retracting mechanism installed at the front of the seat frame, the seat frame comprises a mounting plate, a rear transverse tube and two side plates, the two side plates are arranged opposite to each other, the front parts of the two side plates are fixedly connected by the mounting plate, the rear parts of the two side plates are fixedly connected by the rear transverse tube, and the mounting plate and the rear transverse tube are arranged opposite to each other;

[0012] The secondary leg support extension and retraction mechanism includes two seat frame connecting rod mechanisms and two leg support connecting rod mechanisms. The seat frame connecting rod mechanisms correspond one-to-one to the leg support connecting rod mechanisms, and the seat frame connecting rod mechanisms correspond one-to-one to the side panels. The seat frame connecting rod mechanisms are hinged at the corresponding front portions of the side panels, and the leg support connecting rod mechanisms are hinged at the corresponding front portions of the seat frame connecting rod mechanisms.

[0013] The effect of adopting the above solution: installing a two-stage leg rest extension and retraction mechanism at the front of the seat frame can reduce the distance that the driving connecting rod needs to advance or retract during the leg rest deployment or retraction process, increase the rate of deployment or retraction of the leg rest, and adopt graded and segmented adjustment in structure to reduce the installation space and make the structure more compact.

[0014] The hanging plate includes a hanging plate body, the hanging plate body is in a long strip shape, the connecting plate body is arranged horizontally, a bending line is arranged on the hanging plate body along its length direction, and the front part of the hanging plate body is bent downward along the bending line to form an "L"-shaped structure;

[0015] The horizontal side of the hanging plate body is the hanging side, the vertical side of the hanging plate body is the installation side, the middle part of the hanging side is inclined to form a hanging slope, and the lower edge of the hanging slope faces the rear of the hanging plate body;

[0016] A plurality of hanging units are also provided on the upper surface of the hanging slope, and all the hanging units are evenly arranged along the length direction of the hanging plate body.

[0017] A plurality of hooks are also provided on the upper surface of the rear transverse tube, and the hooks are evenly arranged along the length direction of the rear transverse tube, and the hooks correspond to the hanging units one by one and are arranged opposite to each other;

[0018] The hook includes a hook plate body, one end of which is fixed to the upper surface of the rear transverse tube, and the other end of which extends forward from the upper surface of the rear transverse tube, and the extended end of the hook plate body is bent downward to form an anti-slip slope and then bent upward to the top of the anti-slip slope. The advantage of adopting the above technical solution is that when the serpentine spring is subjected to pressure from above, the ends of both ends of the serpentine spring will abut against the corresponding hanging slope or anti-slip slope to prevent the spring from falling off.

[0019] The hanging unit comprises a hanging piece, the hanging piece is arranged in an arc shape, the hanging piece is buckled on the upper surface of the hanging slope, and a hanging hole is formed between the hanging piece and the upper surface of the hanging slope.

[0020] The side plate comprises a side plate body, the side plate body is in the shape of a channel steel, the side plate body is in the shape of an elongated strip, a front support is provided at the front end of the side plate body, a rear support is provided at the rear end of the side plate body, a middle support is further provided between the front support and the rear support, the front support, the middle support and the rear support are all located in the notch of the side plate body, and the front support, the middle support and the rear support are respectively fixedly connected to the inner wall of the side plate body;

[0021] The two ends of the hanging side surface are attached to and fixedly connected with the outer wall of the front part of the side plate body, and the two ends of the rear cross pipe extend into the rear support member respectively and are fixedly connected.

[0022] The front support member is in a "U"-shaped structure, and includes a front connecting plate and two front supporting plates, the two front supporting plates are parallel to each other and are arranged opposite to each other, the front connecting plates are respectively perpendicular to and connected to the two front supporting plates, the opening direction of the front support member is arranged opposite to the notch of the side plate body, the two front supporting plates are respectively fitted with the inner groove wall of the side plate body, and the front connecting plate is located outside the notch of the side plate body;

[0023] The middle support member is in a "U"-shaped structure, and includes a middle connecting plate and two middle supporting plates. The two middle supporting plates are parallel to each other and are arranged opposite to each other. The middle connecting plate is perpendicular to and connected to the two middle supporting plates respectively. The opening direction of the middle support member is arranged opposite to the notch of the side plate body. The two middle supporting plates are respectively fitted with the inner groove wall in the middle of the side plate body, and the middle connecting plate is located outside the notch of the side plate body.

[0024] The rear support member is in a "U"-shaped structure, comprising a rear connecting plate and two rear support plates, the two rear support plates are parallel to each other and opposite to each other, the rear connecting plate is perpendicular to and connected to the two rear support plates respectively, the opening direction of the rear support member is toward the front support member, the two rear support plates are respectively pressed against the inner groove walls at the rear of the side plate body, the rear connecting plate is perpendicular to the groove bottom surface of the side plate body, the two ends of the rear cross tube are respectively extended between the two rear support plates, and the end of the rear cross tube is pressed against and fixedly connected to the rear support plate.

[0025] The seat frame connecting rod mechanism includes two root connecting rods, one end of each root connecting rod is hinged to the front connecting plate, a driving connecting rod is also hinged to the middle connecting plate, and a reversing connecting rod is also provided on any of the root connecting rods, one end of each driving connecting rod is hinged to the middle connecting plate, the other end of each driving connecting rod is hinged to one end of each reversing connecting rod, and the other end of each reversing connecting rod is hinged to the middle of the corresponding root connecting rod;

[0026] A rocker arm is also fixed on the driving connecting rod, the rocker arm is vertically arranged, and the upper end of the rocker arm is fixedly connected to the driving connecting rod;

[0027] The rocker arm is fixed on the end where the driving connecting rod is hinged to the middle connecting plate.

[0028] The hinge point between the driving connecting rod and the seat frame is located behind the hinge points between all the root connecting rods and the seat frame;

[0029] A rocker arm synchronization rod is also provided between the two side plate bodies, and the two ends of the rocker arm synchronization rod are respectively oriented toward the seat frame connecting rod mechanisms on the two side plate bodies, and the two ends of the rocker arm synchronization rod are respectively fixedly connected to the corresponding rocker arms;

[0030] The rear cross tube is located behind the rocker arm synchronization rod, and a propulsion linear motor is connected between the rear cross tube and the rocker arm synchronization rod. The housing of the propulsion linear motor is hinged to the rear cross tube, and the end of the piston rod of the propulsion linear motor is hinged to the rocker arm synchronization rod.

[0031] The leg support link mechanism includes two extending links, the extending links are hinged to the corresponding root links, the free ends of the two extending links are hinged to the same primary mounting seat, the free end of any of the extending links extends forward to form a secondary mounting portion, a secondary mounting seat is provided on the secondary mounting portion, the secondary mounting seat is hinged to the secondary mounting portion, and a secondary push link is also connected to the primary mounting seat, one end of the secondary push link is hinged to the primary mounting seat, and the other end of the secondary push link is hinged to the secondary mounting seat;

[0032] The secondary mounting seat is located at the inner side of the primary mounting seat, the secondary mounting portion comprises a secondary extension plate and a secondary hinge plate, the secondary extension plate is perpendicular to the secondary hinge plate, the secondary extension plate is perpendicular to and connected to the free end of the extended connecting rod, and the secondary hinge plate is hinged to the secondary mounting seat;

[0033] The middle part of the secondary push connecting rod is bent, the front part of the secondary push connecting rod is inwardly close to the secondary mounting seat and is hinged thereto, and the rear part of the secondary push connecting rod is outwardly close to the primary mounting seat and is hinged thereto.

[0034] The primary mounting seat is provided with a primary mounting lug, and the primary mounting lug extends toward the inner side of the primary mounting seat;

[0035] The secondary mounting seat is provided with a secondary mounting lug, and the secondary mounting lug extends toward the inner side of the secondary mounting seat.

[0036] Beneficial effects: The present invention installs a two-stage leg rest extension and retraction mechanism at the front of the seat frame, which can reduce the distance that the driving connecting rod needs to advance or retract during the process of expanding or retracting the leg rest, thereby increasing the rate of expanding or retracting the leg rest. The mounting seat is graded and segmented during the adjustment process, which can reduce the space it occupies and the external matching space during the expansion and retraction process, making the structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the present invention;

[0038] Figure 2 It is a schematic diagram of the seat frame and the secondary leg rest extension and retraction mechanism in the unfolded state;

[0039] Figure 3 It is a structural schematic diagram of the secondary leg support extension and retraction mechanism;

[0040] Figure 4 It is a schematic diagram of the matching relationship between the primary mounting seat 1a and the secondary mounting seat 1b;

[0041] Figure 5 is a schematic structural diagram of the rear cross pipe 15;

[0042] Figure 6 is a schematic structural diagram of the side panel 3 at a first viewing angle;

[0043] Figure 7 is a schematic structural diagram of the side panel 3 at a second viewing angle;

[0044] Figure 8 It is a structural schematic diagram of the lower mounting plate 28 at the first observation position;

[0045] Fig. 9 It is a structural schematic diagram of the lower mounting plate 28 at the second observation position;

[0046] Fig.10 It is a schematic structural diagram of the lower mounting plate 28 at the third observation position. DETAILED DESCRIPTION

[0047] The present invention is further described below in conjunction with embodiments and drawings.

[0048] like Figures 1 to 10 As shown, a sofa seat frame comprises a seat frame and a secondary leg support retracting mechanism installed at the front of the seat frame, the seat frame comprises a mounting plate 28, a rear transverse tube 15 and two side panels 3, the two side panels 3 are arranged opposite to each other, the front parts of the two side panels 3 are fixedly connected by the mounting plate, the rear parts of the two side panels 3 are fixedly connected by the rear transverse tube 15, and the mounting plate and the rear transverse tube 15 are arranged opposite to each other;

[0049] The secondary leg support extension and retraction mechanism includes two seat frame connecting rod mechanisms and two leg support connecting rod mechanisms. The seat frame connecting rod mechanisms correspond one to one with the leg support connecting rod mechanisms, and the seat frame connecting rod mechanisms correspond one to one with the side panels 3. The seat frame connecting rod mechanisms are hinged at the corresponding front portions of the side panels 3, and the leg support connecting rod mechanisms are hinged at the corresponding front portions of the seat frame connecting rod mechanisms. A mounting seat is hinged on the leg support connecting rod mechanisms.

[0050] in:

[0051] The hanging plate 28 includes a hanging plate body, which is in the shape of a long strip. The connecting plate body is arranged horizontally. A bending line is arranged on the hanging plate body along its length direction. The front part of the hanging plate body is bent downward along the bending line to form an "L"-shaped structure.

[0052] The horizontal side of the hanging plate body is the hanging side 20a, and the vertical side of the hanging plate body is the installation side 20b. The middle part of the hanging side 20a is inclined to form a hanging slope, and the lower edge of the hanging slope faces the rear of the hanging plate body;

[0053] A plurality of hanging units 21 are further provided on the upper surface of the hanging slope, and all the hanging units 21 are evenly arranged along the length direction of the hanging plate body.

[0054] The upper surface of the rear cross tube 15 is also provided with a plurality of hooks, which are evenly arranged along the length direction of the rear cross tube 15 , and the hooks correspond to the hanging units 21 one by one and are arranged opposite to each other;

[0055] The hook includes a hook plate body 29, one end of which is fixed to the upper surface of the rear transverse tube 15, and the other end of the hook plate body 29 extends forward from the upper surface of the rear transverse tube 15. The extended end of the hook plate body 29 is bent downward to form an anti-slip slope and then bent upward to above the anti-slip slope.

[0056] The hanging unit 21 includes a hanging piece, which is arranged in an arc shape and is buckled on the upper surface of the hanging slope. A hanging hole is formed between the hanging piece and the upper surface of the hanging slope.

[0057] The side plate 3 includes a side plate body 30, the side plate body 30 is in the shape of a channel steel, the side plate body 30 is in the shape of an elongated strip, a front support member 31 is provided at the front end of the side plate body 30, a rear support member 33 is provided at the rear end of the side plate body 30, a middle support member 32 is further provided between the front support member 31 and the rear support member 33, the front support member 31, the middle support member 32 and the rear support member 33 are all located in the notch of the side plate body 30, and the front support member 31, the middle support member 32 and the rear support member 33 are respectively fixedly connected to the inner wall of the side plate body 30;

[0058] The two ends of the hanging side surface 20a are attached to and fixedly connected with the outer wall of the front part of the side plate body 30, and the two ends of the rear cross pipe 15 extend into the rear support member 33 respectively and are fixedly connected.

[0059] The front support member 31 is in a "U"-shaped structure, and includes a front connecting plate and two front supporting plates. The two front supporting plates are parallel to each other and are arranged opposite to each other. The front connecting plates are respectively perpendicular to and connected to the two front supporting plates. The opening direction of the front support member 31 is arranged opposite to the notch of the side plate body 30. The two front supporting plates are respectively fitted with the inner groove wall of the side plate body 30, and the front connecting plate is located outside the notch of the side plate body 30.

[0060] The middle support member 32 is in a "U"-shaped structure, and includes a middle connecting plate and two middle supporting plates. The two middle supporting plates are parallel to each other and are arranged opposite to each other. The middle connecting plate is perpendicular to and connected to the two middle supporting plates respectively. The opening direction of the middle support member 32 is arranged opposite to the notch of the side plate body 30. The two middle supporting plates are respectively fitted with the inner groove wall in the middle of the side plate body 30, and the middle connecting plate is located outside the notch of the side plate body 30.

[0061] The rear support member 33 is in a "U"-shaped structure, and includes a rear connecting plate and two rear support plates. The two rear support plates are parallel to each other and are arranged opposite to each other. The rear connecting plate is perpendicular to and connected to the two rear support plates respectively. The opening direction of the rear support member 33 is toward the front support member 31. The two rear support plates are respectively pressed against the inner groove walls at the rear of the side plate body 30. The rear connecting plate is perpendicular to the groove bottom surface of the side plate body 30. The two ends of the rear cross tube 15 are respectively extended between the two rear support plates, and the end of the rear cross tube 15 is tightly pressed against and fixedly connected to the rear support plate.

[0062] The seat frame connecting rod mechanism includes two root connecting rods 11, one of which is a first root connecting rod 111, and the other is a second root connecting rod 112;

[0063] The leg support link mechanism includes two extending links 18, one of which is a first extending link 181, and the other is a second extending link 182;

[0064] One end of the first root connecting rod 111 is hinged to the front connecting plate, the other end of the first root connecting rod 111 is hinged to one end of the first extending connecting rod 181, and one end of the first extending connecting rod 181 is hinged to the mounting seat;

[0065] One end of the second root connecting rod 112 is hinged to the front connecting plate, the other end of the second root connecting rod 112 is hinged to one end of the second extending connecting rod 182, and one end of the second extending connecting rod 182 is hinged to the mounting seat;

[0066] The second root connecting rod 112 is also hinged to the first extending connecting rod 181 .

[0067] The seat frame includes two side plates 3 arranged opposite to each other, the leg brackets are respectively arranged on the two side plates 3, and a rocker arm synchronization rod 16 is also arranged between the two side plates 3, the two ends of the rocker arm synchronization rod 16 are respectively facing the leg brackets on the two side plates 3, and the two ends of the rocker arm synchronization rod 16 are respectively driven by mechanisms corresponding to the leg brackets;

[0068] The driving mechanism includes a driving link 12 and a reversing link 13. The reversing link 13 is provided on any of the root links 11 of the same leg bracket. One end of the driving link 12 is hinged to the corresponding side panel 3, the other end of the driving link 12 is hinged to one end of the corresponding reversing link 13, the other end of the reversing link 13 is hinged to the middle of the corresponding root link 11, and the hinge point between the driving link 12 and the side panel 3 is located behind the hinge points between all the root links 11 and the side panels 3.

[0069] In order to facilitate driving, a rocker arm 14 is also fixed on the driving connecting rod 12. The rocker arm 14 is vertically arranged, and the upper end of the rocker arm 14 is fixedly connected to the driving connecting rod 12. The rocker arm 14 is fixed to the end where the driving connecting rod 12 and the middle connecting plate are hinged, and the two ends of the rocker arm synchronization rod 16 are respectively fixedly connected to the corresponding rocker arm 14.

[0070] The mounting seat includes a primary mounting seat 1a and a secondary mounting seat 1b, the free ends of two extending connecting rods 18 are hinged to the same primary mounting seat 1a, the free end of the second extending connecting rod 182 extends forward to form a secondary mounting portion, a secondary mounting seat 1b is provided on the secondary mounting portion, and the secondary mounting seat 1b is hinged to the secondary mounting portion, and a secondary pushing connecting rod 19 is also connected to the primary mounting seat 1a, one end of the secondary pushing connecting rod 19 is hinged to the primary mounting seat 1a, and the other end of the secondary pushing connecting rod 19 is hinged to the secondary mounting seat 1b.

[0071] The secondary mounting seat 1b is located on the inner side of the primary mounting seat 1a, and the secondary mounting portion includes a secondary extension plate 18a and a secondary hinged plate 18b, the secondary extension plate 18a is perpendicular to the secondary hinged plate 18b, the secondary extension plate 18a is perpendicular to and connected to the free end of the extended connecting rod 18, and the secondary hinged plate 18b is hinged to the secondary mounting seat 1b.

[0072] The middle part of the secondary push link 19 is bent, the front part of the secondary push link 19 is inwardly close to the secondary mounting seat 1b and hinged thereto, and the rear part of the secondary push link 19 is outwardly close to the primary mounting seat 1a and hinged thereto.

[0073] The primary mounting seat 1a is provided with a primary mounting lug 1c, which extends inwardly of the primary mounting seat 1a; the secondary mounting seat 1b is provided with a secondary mounting lug 1d, which extends inwardly of the secondary mounting seat 1b.

[0074] The rear parts of the two side plates 3 are fixedly connected by a rear cross tube 15, and the rear cross tube 15 is located behind the rocker arm synchronization rod 16. A propulsion linear motor 17 is connected between the rear cross tube 15 and the rocker arm synchronization rod 16. The housing of the propulsion linear motor 17 is hinged to the rear cross tube 15, and the end of the piston rod of the propulsion linear motor 17 is hinged to the rocker arm synchronization rod 16.

[0075] The piston rod of the propulsion linear motor 17 extends and retracts forward and backward, driving the driving connecting rod 12 to rotate forward and reverse, and then drives the first root connecting rod 111 to rotate through the reversing connecting rod 13, so that the leg bracket is unfolded or retracted, and the first-level mounting seat 1a is hinged and the second-level mounting seat 1b is unfolded or retracted.

[0076] Furthermore, a primary leg support strip and a secondary leg support strip (not shown) are provided between the two side panels 3, and both ends of the primary leg support strip are respectively fixed on the primary mounting lug 1c, and both ends of the secondary leg support strip are respectively fixed on the secondary mounting lug 1d.

[0077] The side plate body 30 is further provided with a plurality of reinforcing grooves 34 , all of which are arranged along the length direction of the side plate body 30 , and all of which are located at the outer wall of the groove bottom of the side plate body 30 .

[0078] The side plate body 30 is also penetrated by a plurality of strip holes, all of which are evenly arranged along the length direction of the side plate body 30 and parallel thereto, and all of which are located at the connection between the same groove wall and the groove bottom of the side plate body 30 .

[0079] The side plate body 30 is also provided with a plurality of hanging openings, all of which are arranged along the length direction of the side plate body 30, all of which are located on the outer wall of the groove bottom of the side plate body 30, and all of which are close to the strip holes.

[0080] Three of the hanging openings and one of the strip holes are provided between any two adjacent reinforcing grooves 34 , and a stress dissipation opening is provided at each end of the strip hole, and the stress dissipation opening is close to the corresponding hanging opening.

[0081] The hanging inclined surface is also penetrated by a plurality of punching holes, the punching holes correspond to the hanging holes one by one, and the punching holes are connected to the corresponding hanging holes.

[0082] A plurality of stress relief openings are also provided on the inner circle edge of the punching hole, and one of the stress relief openings is provided on both sides of the end of the hanging piece.

[0083] A first reinforcement groove 22 is further provided between any two adjacent hanging units 21 , and the bottom of the first reinforcement groove 22 protrudes toward the bottom of the connecting plate body.

[0084] The connecting side surface 20a and the mounting side surface 20b have an arc-shaped transition and form a sloping surface, and the sloping surface is located in the middle of the connecting plate body;

[0085] At least one mounting hole 23 is respectively formed at both ends of the hanging side surface 20a.

[0086] The upper surface of the yielding slope is further provided with a plurality of second reinforcing grooves 24 , all of which are evenly arranged along the length direction of the hanging plate body, and the bottoms of the second reinforcing grooves 24 protrude toward the bottom of the connecting plate body.

[0087] A third strip-shaped reinforcing groove 25 is also provided on the upper surface of the hanging side surface 20a. The third strip-shaped reinforcing groove 25 is parallel to the length direction of the hanging plate body, the third strip-shaped reinforcing groove 25 is close to the bending line, and the bottom of the third strip-shaped reinforcing groove 25 protrudes toward the bottom of the connecting plate body.

[0088] The hanging side surfaces 20a around all the mounting holes 23 protrude downward.

[0089] The installation side surface 20 b is further provided with a plurality of positioning openings 26 , all of which are evenly distributed along the length direction of the mounting plate body, and all of which are close to the edge of the longer side of the installation side surface 20 b .

[0090] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A sofa seat frame, characterized in that: The invention comprises a seat frame and a secondary leg support retracting mechanism installed at the front of the seat frame, wherein the seat frame comprises a mounting plate (28), a rear transverse tube (15) and two side plates (3), wherein the two side plates (3) are arranged opposite to each other, the front parts of the two side plates (3) are fixedly connected via the mounting plate, the rear parts of the two side plates (3) are fixedly connected via the rear transverse tube (15), and the mounting plate and the rear transverse tube (15) are arranged opposite to each other; The secondary leg support retracting mechanism comprises two seat frame link mechanisms and two leg support link mechanisms, the seat frame link mechanisms correspond to the leg support link mechanisms one-to-one, the seat frame link mechanisms correspond to the side panels (3) one-to-one, the seat frame link mechanisms are hinged to the front portions of the corresponding side panels (3), and the leg support link mechanisms are hinged to the front portions of the corresponding seat frame link mechanisms; The hanging plate (28) comprises a hanging plate body, the hanging plate body is in the shape of an elongated strip, the connecting plate body is arranged horizontally, a bending line is arranged on the hanging plate body along its length direction, and the front part of the hanging plate body is bent downward along the bending line to form an "L"-shaped structure; The horizontal side of the hanging plate body is a hanging side (20a), the vertical side of the hanging plate body is a mounting side (20b), the middle part of the hanging side (20a) is inclined to form a hanging inclined surface, and the lower edge of the hanging inclined surface faces the rear of the hanging plate body; A plurality of hanging units (21) are also provided on the upper surface of the hanging slope, and all the hanging units (21) are evenly arranged along the length direction of the hanging plate body; A plurality of hooks are also provided on the upper surface of the rear transverse tube (15), the hooks being evenly arranged along the length direction of the rear transverse tube (15), the hooks corresponding to the hanging units (21) one by one and being arranged opposite to each other; The hook comprises a hook plate body (29), one end of the hook plate body (29) is fixed to the upper surface of the rear transverse tube (15), the other end of the hook plate body (29) extends forward from the upper surface of the rear transverse tube (15), and the extended end of the hook plate body (29) is bent downward to form an anti-slip slope and then bent upward to above the anti-slip slope; The hanging unit (21) comprises a hanging piece, the hanging piece is arranged in an arc shape, the hanging piece is buckled on the upper surface of the hanging slope, and a hanging hole is formed between the hanging piece and the upper surface of the hanging slope; The side plate (3) comprises a side plate body (30), the side plate body (30) is in the shape of a channel steel, the side plate body (30) is in the shape of an elongated strip, a front support member (31) is provided at the front end of the side plate body (30), a rear support member (33) is provided at the rear end of the side plate body (30), a middle support member (32) is further provided between the front support member (31) and the rear support member (33), the front support member (31), the middle support member (32) and the rear support member (33) are all located in a notch of the side plate body (30), and the front support member (31), the middle support member (32) and the rear support member (33) are respectively fixedly connected to the inner wall of the side plate body (30); The two ends of the hanging side surface (20a) are attached to and fixedly connected to the outer wall of the front part of the side plate body (30), and the two ends of the rear transverse tube (15) respectively extend into the rear support member (33) and are fixedly connected; The front support member (31) is in a "U"-shaped structure, comprising a front connecting plate and two front supporting plates, the two front supporting plates are parallel to each other and arranged opposite each other, the front connecting plates are respectively perpendicular to and connected to the two front supporting plates, the opening direction of the front support member (31) is arranged opposite to the notch of the side plate body (30), the two front supporting plates are respectively fitted with the inner groove wall of the side plate body (30), and the front connecting plate is located outside the notch of the side plate body (30); The middle support member (32) is in a "U"-shaped structure. The middle support member (32) comprises a middle connecting plate and two middle supporting plates. The two middle supporting plates are parallel to each other and arranged opposite to each other. The middle connecting plate is perpendicular to and connected to the two middle supporting plates respectively. The opening direction of the middle support member (32) is arranged opposite to the notch of the side plate body (30). The two middle supporting plates are respectively fitted with the inner groove wall in the middle of the side plate body (30). The middle connecting plate is located outside the notch of the side plate body (30). The rear support member (33) is in a "U"-shaped structure. The rear support member (33) comprises a rear connecting plate and two rear supporting plates. The two rear supporting plates are arranged parallel to each other and face each other. The rear connecting plate is perpendicular to and connected to the two rear supporting plates respectively. The opening direction of the rear support member (33) faces the front support member (31). The two rear supporting plates are respectively pressed against the inner groove wall of the rear part of the side plate body (30). The rear connecting plate is perpendicular to the groove bottom surface of the side plate body (30). The two ends of the rear transverse tube (15) respectively extend between the two rear supporting plates. The end of the rear transverse tube (15) is pressed against and fixedly connected to the rear supporting plate. The seat frame connecting rod mechanism comprises two root connecting rods (11), one end of each root connecting rod (11) is hinged to the front connecting plate, a driving connecting rod (12) is also hinged to the middle connecting plate, and a reversing connecting rod (13) is also provided on any one of the root connecting rods (11), one end of each driving connecting rod (12) is hinged to the middle connecting plate, the other end of each driving connecting rod (12) is hinged to one end of each reversing connecting rod (13), and the other end of each reversing connecting rod (13) is hinged to the middle of the corresponding root connecting rod (11); A rocker arm (14) is also fixed to the driving connecting rod (12); the rocker arm (14) is arranged vertically, and the upper end of the rocker arm (14) is fixedly connected to the driving connecting rod (12); The rocker arm (14) is fixed to the end portion of the driving connecting rod (12) hinged to the middle connecting plate; The hinge point between the driving connecting rod (12) and the seat frame is located behind the hinge points between all the root connecting rods (11) and the seat frame; A rocker arm synchronization rod (16) is further provided between the two side plate bodies (30), and two ends of the rocker arm synchronization rod (16) are respectively oriented toward the seat frame connecting rod mechanisms on the two side plate bodies (30), and two ends of the rocker arm synchronization rod (16) are respectively fixedly connected to the corresponding rocker arms (14); The rear transverse tube (15) is located behind the rocker arm synchronization rod (16), and a propulsion linear motor (17) is connected between the rear transverse tube (15) and the rocker arm synchronization rod (16), the housing of the propulsion linear motor (17) is hinged to the rear transverse tube (15), and the end of the piston rod of the propulsion linear motor (17) is hinged to the rocker arm synchronization rod (16); The leg support link mechanism comprises two extending links (18), the extending links (18) being hinged to the corresponding root links (11), the free ends of the two extending links (18) being hinged to the same primary mounting seat (1a), the free end of any of the extending links (18) extending forward to form a secondary mounting portion, a secondary mounting seat (1b) being provided on the secondary mounting portion, the secondary mounting seat (1b) being hinged to the secondary mounting portion, and a secondary pushing link (19) being connected to the primary mounting seat (1a), one end of the secondary pushing link (19) being hinged to the primary mounting seat (1a), and the other end of the secondary pushing link (19) being hinged to the secondary mounting seat (1b); The secondary mounting seat (1b) is located on the inner side of the primary mounting seat (1a), the secondary mounting portion comprises a secondary extension plate (18a) and a secondary hinge plate (18b), the secondary extension plate (18a) is perpendicular to the secondary hinge plate (18b), the secondary extension plate (18a) is perpendicular to and connected to the free end of the extended connecting rod (18), and the secondary hinge plate (18b) is hinged to the secondary mounting seat (1b); The middle portion of the secondary push connecting rod (19) is bent, the front portion of the secondary push connecting rod (19) is inwardly close to the secondary mounting seat (1b) and is hinged thereto, and the rear portion of the secondary push connecting rod (19) is outwardly close to the primary mounting seat (1a) and is hinged thereto; The primary mounting seat (1a) is provided with a primary mounting lug (1c), and the primary mounting lug (1c) extends toward the inside of the primary mounting seat (1a); The secondary mounting seat (1b) is provided with a secondary mounting lug (1d), and the secondary mounting lug (1d) extends toward the inner side of the secondary mounting seat (1b); The side plate body (30) is further provided with a plurality of fourth reinforcement grooves (34), all of the fourth reinforcement grooves (34) are arranged along the length direction of the side plate body (30), and all of the fourth reinforcement grooves (34) are located on the outer wall of the groove bottom of the side plate body (30); The side plate body (30) is also penetrated by a plurality of strip holes, all of which are evenly arranged along the length direction of the side plate body (30) and parallel thereto, and all of which are located at the connection between the same groove wall and the groove bottom of the side plate body (30); The side plate body (30) is also provided with a plurality of hanging openings, all of which are arranged along the length direction of the side plate body (30), all of which are located on the outer wall of the groove bottom of the side plate body (30), and all of which are close to the strip-shaped holes; Three of the hanging openings and one of the strip-shaped holes are provided between any two adjacent fourth reinforcing grooves (34), and a first stress dissipation opening is provided at each end of the strip-shaped hole, the first stress dissipation opening being close to the corresponding hanging opening; The hanging inclined surface is also penetrated by a plurality of punching holes, the punching holes correspond to the hanging holes one by one, and the punching holes are connected to the corresponding hanging holes; A plurality of second stress dissipation openings are also provided on the inner circle edge of the punching hole, and a second stress dissipation opening is respectively provided on both sides of the end of the hanging piece; A first reinforcement groove (22) is further provided between any two adjacent hanging units (21), and the bottom of the first reinforcement groove (22) protrudes toward the bottom of the connecting plate body; An arc-shaped transition is formed between the hanging side surface (20a) and the installation side surface (20b) to form a paving inclined surface, and the paving inclined surface is located in the middle of the hanging plate body; At least one mounting hole (23) is also respectively provided at both ends of the hanging side surface (20a); The upper surface of the yielding slope is also provided with a plurality of second reinforcing grooves (24), all of which are evenly arranged along the length direction of the hanging plate body, and the bottoms of the second reinforcing grooves (24) protrude toward the bottom of the connecting plate body; A third strip-shaped reinforcement groove (25) is also provided on the upper surface of the hanging side surface (20a), the third strip-shaped reinforcement groove (25) is parallel to the length direction of the hanging plate body, the third strip-shaped reinforcement groove (25) is close to the bending line, and the groove bottom of the third strip-shaped reinforcement groove (25) protrudes toward the bottom of the connecting plate body; The hanging side surfaces (20a) around all the mounting holes (23) protrude downwards; A plurality of positioning openings (26) are also provided on the installation side surface (20b), and all the positioning openings (26) are evenly distributed along the length direction of the hanging plate body, and all the positioning openings (26) are close to the edge of the longer side of the installation side surface (20b).

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