Seat framework and multifunctional seat

Abstract

The utility model relates to a seat framework and a multifunctional seat, the seat framework comprises a machine body assembly, a hip assembly, a folding and unfolding assembly, a linkage assembly and a leg assembly, and the hip assembly is installed on the machine body assembly; the folding and unfolding assembly comprises a driving rod group, and the driving rod group is movably connected with the hip assembly to form a first connecting rod mechanism; the linkage assembly comprises a linkage rod set and a connecting rod fixing piece, the linkage rod set, the driving rod set and the connecting rod fixing piece are movably connected and form a second connecting rod mechanism, and the connecting rod fixing piece is installed on the driving rod set; the leg assembly comprises a shelf and a leg connecting rod, the shelf, the leg connecting rod and the driving rod set are movably connected and form a third connecting rod mechanism, and the leg connecting rod, the linkage rod set and the driving rod set are connected and share a connecting rod component.

Description

Technical Field

[0001] The utility model relates to the technical field of chairs, in particular to a seat frame and a multifunctional seat. Background Art

[0002] Multifunctional seats are very popular because they can provide multiple postures for users to sit, lie down or lift their legs to relax. Existing multifunctional seats usually include a retractable and extendable leg rest. The leg rest extends outward relative to the hip assembly to support the user's legs. When the multifunctional seat switches to a conventional sitting posture, the leg rest is retracted under the hip assembly, and the leg rest remains in a vertical state approximately perpendicular to the ground. Therefore, it is necessary to reasonably design the distance between the hip assembly and the ground. If the hip assembly is too close to the ground, the leg rest cannot be retracted, and a higher hip assembly will sacrifice a certain degree of use comfort. Summary of the Utility Model

[0003] In view of this, it is necessary to provide an improved seat frame and a multifunctional seat.

[0004] The seat frame of the utility model includes a fuselage assembly, a hip assembly, a retractable and extendable assembly, a linkage assembly and a leg assembly. The hip assembly is installed on the fuselage assembly; the retractable and extendable assembly includes a driving rod group, and the driving rod group is movably connected to the hip assembly to form a first linkage mechanism; the linkage assembly includes a linkage rod group and a link fixing member, and the linkage rod group, the driving rod group and the link fixing member are movably connected to form a second linkage mechanism, and the link fixing member is installed on the driving rod group; the leg assembly includes a shelf and a leg link, and the shelf, the leg link and the driving rod group are movably connected to form a third linkage mechanism, and the leg link, the linkage rod group and the driving rod group are connected and share link members.

[0005] The seat frame and the multifunctional seat of the utility model have the following beneficial effects:

[0006] During the process of the seat frame switching from a leisure or lying posture to a sitting posture, both the shelf and the leg rest carried by the shelf can maintain a substantially stable posture, and the leg rest approximately remains parallel to the ground. The first linkage mechanism, the second linkage mechanism and the third linkage mechanism are linked and coordinated to move the shelf, and the rotation amplitude of the shelf is very small or hardly rotates. Finally, the leg rest is retracted under the hip assembly in a posture approximately parallel to the ground. Therefore, the distance between the hip assembly and the ground can be shortened to accommodate the leg rest, and the decrease in the height of the hip assembly improves the comfort of the multifunctional seat. The surface of the leg rest for supporting the legs is hidden under the hip assembly, reducing the probability of the surface of the leg rest being bruised or scratched by foreign objects.

[0007] In some embodiments, the drive rod group includes a first rocker, a second rocker, and a first connecting rod. The first rocker and the second rocker are hinged to the hip assembly, and both are rotatably connected to the first connecting rod. The four-bar mechanism formed by the first rocker, the first connecting rod, the second rocker, and the hip assembly is the first connecting rod mechanism.

[0008] In some embodiments, the connecting rod fixing member is fixedly connected to the second rocker or the first rocker.

[0009] In some embodiments, the expansion and contraction assembly further includes an extension assisting member connecting the first rocker and the second rocker. The extension assisting member is used for elastic deformation to promote and limit the outward rotation of the first rocker and the second rocker relative to the hip assembly, and can maintain the outward expansion of the first rocker and the second rocker relative to the hip assembly.

[0010] In some embodiments, the first rocker includes a first rod segment and a second rod segment connected by bending. The second rocker includes a third rod segment and a fourth rod segment connected by bending. The first rod segment and the third rod segment are hinged to the hip assembly, and the second rod segment and the fourth rod segment are hinged to the first connecting rod. When the first rocker and the second rocker are folded towards the hip assembly: the first rod segment and the third rod segment rest on the side of the hip assembly, an angle is formed between the fourth rod segment and the third rod segment to avoid the first rocker, and an angle is formed between the second rod segment and the first rod segment to avoid the leg assembly.

[0011] In some embodiments, the linkage rod group includes a third rocker and a second connecting rod. The drive rod group includes a second rocker and a first connecting rod. The second rocker is hinged between the first connecting rod and the hip assembly. The connecting rod fixing member is fixed to the second rocker. The third rocker is hinged to the connecting rod fixing member and the second connecting rod. The first connecting rod is hinged to the second connecting rod. The four-bar mechanism formed by the third rocker, the second connecting rod, the first connecting rod, and the connecting rod fixing member is the second connecting rod mechanism.

[0012] In some embodiments, the second connecting rod includes a main body segment and a fork rod fixedly connected. The main body segment is hinged to the third rocker and the first connecting rod. The leg connecting rod includes a fourth rocker hinged to the shelf and the fork rod. The first connecting rod includes a leg support segment hinged to the shelf. The four-bar mechanism formed by the fourth rocker, the shelf, the fork rod, and the leg support segment is the third connecting rod mechanism. The component formed by the fork rod and the second connecting rod fixedly connected is used as a shared connecting rod component between the leg connecting rod and the linkage rod group.

[0013] In some embodiments, the fork rod and the second connecting rod are integrally formed connecting rod components.

[0014] In some embodiments, the fourth rocker and the leg support segment cross. The leg support segment is hinged to the front end of the shelf, and the fourth rocker is hinged to the rear end of the shelf.

[0015] In some embodiments, the connecting rod fixing member includes two fixing member hinge portions that respectively hinge the third rocker and the first connecting rod, and the second connecting rod includes two connecting rod hinge portions that respectively hinge the third rocker and the first connecting rod. The distance between the two connecting rod hinge portions is greater than the distance between the two fixing member hinge portions.

[0016] In some embodiments, the seat frame further includes a driving assembly. The driving assembly is mounted on the fuselage assembly and connected to the retractable assembly, and is used to drive the retractable assembly to extend and retract so as to send out and withdraw the shelf.

[0017] In some embodiments, the fuselage assembly includes a support unit and a linkage rocker. The seat frame further includes a posture-changing rod group and a backrest rocker. The posture-changing rod group, the backrest rocker and the hip assembly are connected to form a fourth link mechanism. The support unit hinges the linkage rocker and the backrest rocker, and the support unit, the linkage rocker, the posture-changing rod group and the backrest rocker form a fifth link mechanism.

[0018] In some embodiments, the support unit is hinged between the two ends of the backrest rocker. One end of the backrest rocker protrudes above the top of the hip assembly, and the other end extends to the bottom of the hip assembly and is connected to the posture-changing rod group.

[0019] In some embodiments, the posture-changing rod group includes a posture-changing rocker and a posture-changing connecting rod. The posture-changing rocker is hinged to the hip assembly and the posture-changing connecting rod, and the posture-changing connecting rod is hinged to the linkage rocker and the backrest rocker. The four-bar mechanism formed by connecting the support unit, the linkage rocker, the posture-changing connecting rod and the backrest rocker is the fifth link mechanism.

[0020] In some embodiments, the fourth link mechanism is a four-bar mechanism. The seat frame further includes an elastic auxiliary member connecting the fourth link mechanism and the support unit. The elastic auxiliary member has a first stretched state and a second stretched state with a decreasing length. When the elastic auxiliary member is in the first stretched state, the driving rod group abducts relative to the hip assembly and the backrest rocker reclines. When the elastic auxiliary member is in the second stretched state, the driving rod group abducts relative to the hip assembly and the backrest rocker resets.

[0021] In some embodiments, the number of the backrest rockers is two. The two backrest rockers are spaced apart in the left-right orientation of the seat frame. The seat frame further includes a balance connecting rod, and the two ends of the balance connecting rod are respectively fixedly connected to the two backrest rockers.

[0022] The multifunctional seat provided by the present utility model includes a seat frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of the seat frame according to an embodiment of the present utility model;

[0024] Figure 2 is a structural schematic diagram of the seat frame according to Embodiment 1 of the present utility model in a sitting posture state;

[0025] Figure 3 is Figure 2 a schematic structural view of the shown seat frame from another perspective;

[0026] Figure 4 is a schematic structural view of the seat frame of the first embodiment of the present utility model in a transitional state;

[0027] Figure 5 is Figure 4 a schematic structural view of the shown seat frame from another perspective;

[0028] Figure 6 is a schematic structural view of the seat frame of the first embodiment of the present utility model in a leisure position state;

[0029] Figure 7 is Figure 6 a schematic structural view of the shown seat frame from another perspective;

[0030] Figure 8 is a schematic structural view of the seat frame of the second embodiment of the present utility model in a sitting position state;

[0031] Figure 9 is a schematic structural view of the seat frame of the second embodiment of the present utility model in a transitional state;

[0032] Figure 10 is a schematic structural view of the seat frame of the second embodiment of the present utility model in a leisure position state;

[0033] Figure 11 is a schematic structural view of the seat frame of the second embodiment of the present utility model in a lying position state;

[0034] Figure 12 is a diagram of the mechanism connection relationship of the seat frame of the second embodiment of the present utility model in a lying position state;

[0035] Figure 13 is a three - dimensional structural view of the seat frame of the second embodiment of the present utility model in a lying position state.

[0036] Description of reference numerals: 100, seat frame; 10, fuselage assembly; 11, support unit; 111, mounting side plate; 1111, third limiting portion; 112, backrest load-bearing member; 1121, fourth limiting portion; 12, linkage rocker; 20, hip assembly; 21, first limiting portion; 22, second limiting portion; 30, retractable assembly; 31, first rocker; 311, first rod segment; 312, second rod segment; 32, second rocker; 321, third rod segment; 322, fourth rod segment; 33, first link; 331, leg support segment; 40, linkage assembly; 41, third rocker; 42, second link; 421, link hinge portion; 422, fork rod; 423, main body segment; 43, link fixing member; 431, fixing member hinge portion; 50, leg assembly; 51, shelf; 52, leg rest; 54, fourth rocker; 60, drive assembly; 61, motor body; 62, push rod; 71, posture-changing rocker; 72, posture-changing link; 73, back support rocker; 81, extension assist member; 82, elastic auxiliary member; 90, balance link. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0039] The present invention provides a seat frame 100 and a multifunctional seat. The multifunctional seat includes the seat frame 100 and further includes a soft material wrapped outside the seat frame 100. The soft material includes a seat cushion, a leg rest 52, a backrest cushion, etc. The morphological structure of the seat frame 100 determines what structural form the multifunctional seat is in. The multifunctional seat switches to different structures and forms through the active deformation of the seat frame 100. These forms at least include a sitting posture and a leisure posture. The sitting posture allows the user to sit on the multifunctional seat in a conventional sitting posture with both feet on the ground and the torso straight. The leisure posture allows the user to sit on the multifunctional seat with both feet lifted off the ground. Compared with the sitting posture, the leisure posture allows the user to relax the leg muscles and stretch the knee joints and ankle joints.

[0040] Refer to Figure 1 and Figure 11 The seat frame 100 of the present utility model includes a fuselage assembly 10, a hip assembly 20, an expansion and retraction assembly 30, a linkage assembly 40, a leg assembly 50 and a drive assembly 60. The hip assembly 20 and the drive assembly 60 are installed on the fuselage assembly 10. The hip assembly 20 is used to carry a seat cushion to support the user's hips. The expansion and retraction assembly 30, the linkage assembly 40 and the leg assembly 50 form a footrest device. The footrest device is used to carry a leg rest 52 to support the user's legs and feet. The drive assembly 60 is drivingly connected to the expansion and retraction assembly 30 and is used to drive the expansion and retraction of the expansion and retraction assembly 30 to change the form of the footrest device. The shelf 51 is sent to a position at a certain height from the ground and at a certain distance from the hip assembly 20 to support the legs and feet as the expansion and retraction assembly 30 expands, and is withdrawn as the expansion and retraction assembly 30 retracts. Finally, the shelf 51 and the leg rest 52 are withdrawn below the hip assembly 20, that is, to the side of the hip assembly 20 close to the ground.

[0041] Refer to Figure 2 、 Figure 4 and Figure 6 The expansion and retraction assembly 30 includes a drive rod group. The drive rod group is movably connected to the hip assembly 20 and forms a first link mechanism. The linkage assembly 40 includes a linkage rod group and a link fixing member 43. The linkage rod group, the drive rod group and the link fixing member 43 are movably connected and form a second link mechanism. The link fixing member 43 is installed on some link members of the drive rod group. The leg assembly 50 includes a shelf 51 and a leg link. The shelf 51, the leg link and the drive rod group are movably connected and form a third link mechanism. The leg link is connected to the linkage rod group and can be deformed in association, that is, when one of the leg link and the linkage rod group is deformed, it will inevitably drive the other to deform. The leg link and the linkage rod group share some link members.

[0042] Optionally, refer to Figure 3 、 Figure 5 and Figure 7 The drive assembly 60 includes a push rod 62 motor. The push rod 62 motor includes a motor body 61 and a push rod 62. The motor body 61 is installed on the fuselage assembly 10. The push rod 62 extends from the motor body 61 and is connected to the drive rod group. During the operation of the push rod 62 motor, the push rod 62 can move relative to the motor body 61, so as to change the length of the push rod 62 extending from the motor body 61, and further apply a thrust or a pull force to the drive rod group.

[0043] Figures 2 - 3Schematically shows the structure of the seat frame 100 of the first embodiment in the sitting posture state. The retractable and extendable assembly 30 is in the curled state, the drive rod group is curled under the hip assembly 20. At this time, the length of the push rod 62 extending out of the motor body 61 is the shortest. The linkage assembly 40 and the leg assembly 50 are also curled under the hip assembly 20. The leg rest 52 installed on the shelf 51 is located in the gap between the leg link and the side of the hip assembly 20 close to the ground at this time;

[0044] Figures 4 - 5 Schematically shows the structure of the seat frame 100 of the first embodiment in the transitional state. The transitional state is the intermediate state when the seat frame 100 transitions from the sitting posture state to the leisure posture state. At this time, the length of the push rod 62 extending out of the motor body 61 increases somewhat, the retractable and extendable assembly 30 extends somewhat, the drive rod group is still under the hip assembly 20, and the linkage assembly 40 and the leg assembly 50 generate a forward displacement, and then move out from under the hip assembly 20;

[0045] Figures 6 - 7 Schematically shows the structure of the seat frame 100 of the first embodiment in the leisure posture state. The length of the push rod 62 extending out of the motor body 61 further increases, the retractable and extendable assembly 30 extends further, the drive rod group moves out from under the hip assembly 20, the linkage assembly 40 and the leg assembly 50 are further displaced forward compared to the transitional state, the height of the leg assembly 50 from the ground further rises, and the shelf 51 is brought by the leg link to a height not lower than that of the hip assembly 20.

[0046] Specifically, referring to Figures 10 - 11 , the drive rod group includes a first rocker 31, a second rocker 32 and a first link 33. The drive assembly 60 is drivingly connected to the drive rod group. As shown in Figure 4 and Figure 6 , the end of the push rod 62 is hinged to the first rocker 31. The first rocker 31 and the second rocker 32 are hinged to the hip assembly 20, and both are rotatably connected to the first link 33. The first rocker 31, the first link 33, the second rocker 32 and the hip assembly 20 form a first link mechanism, and the first link mechanism is a four-bar mechanism.

[0047] Referring to Figures 1 - 2 , Figure 6 , Figure 11 , the link fixing member 43 is fixedly connected to the second rocker 32. The whole formed by the link fixing member 43 and the second rocker 32 is an independent link member for the first link mechanism. The link fixing member 43 is fixedly riveted and installed on the second rocker 32. In other embodiments, the link fixing member 43 can also be fixedly connected to the first rocker 31.

[0048] Referring again to Figure 1 , Figure 4 , Figure 7 , Figures 10 - 11, the linkage rod group includes a third rocker 41 and a second connecting rod 42. The third rocker 41 is hinged to a connecting rod fixing member 43 and the second connecting rod 42. The first connecting rod 33 is also hinged to the second connecting rod 42. Therefore, the third rocker 41, the second connecting rod 42, the first connecting rod 33 and the connecting rod fixing member 43 form a second connecting rod mechanism, and the second connecting rod mechanism is a four-bar mechanism.

[0049] As described above, since the connecting rod fixing member 43 has been fixedly connected to the second rocker 32, the integral formed by the connecting rod fixing member 43 and the second rocker 32 is an independent connecting rod member for the second connecting rod mechanism. Therefore, two connecting rod members are shared between the first connecting rod mechanism and the second connecting rod mechanism. One of the connecting rod members shared by the first connecting rod mechanism and the second connecting rod mechanism is the integral formed by the connecting rod fixing member 43 and the second rocker 32, and the other connecting rod member shared by the first connecting rod mechanism and the second connecting rod mechanism is the first connecting rod 33.

[0050] Refer to Figure 4 , Figure 6 , Figures 8 - 9 , Figure 11 , the leg connecting rod includes a fourth rocker 54. The second connecting rod 42 includes a main body section 423 and a fork rod 422 which are fixedly connected. The main body section 423 is hinged to the third rocker 41 and the first connecting rod 33. The fourth rocker 54 is hinged to a shelf 51 and the fork rod 422. The first connecting rod 33 includes a leg support section 331. The leg support section 331 is hinged to the shelf 51 and is also hinged to the second connecting rod 42, that is, the hinging of the first connecting rod 33 and the second connecting rod 42 is realized by the leg support section 331 hinging to the second connecting rod 42. The fourth rocker 54, the shelf 51, the second connecting rod 42 and the leg support section 331 form a third connecting rod mechanism, and the third connecting rod mechanism is a four-bar mechanism.

[0051] The second connecting rod 42 formed by the fork rod 422 and the main body section 423 is an independent connecting rod member for the third connecting rod mechanism. The leg support section 331 is a part of the first connecting rod 33. Therefore, the first connecting rod 33 is a connecting rod member shared by the first connecting rod mechanism, the second connecting rod mechanism and the third connecting rod mechanism, and the second connecting rod 42 is a connecting rod member shared by the second connecting rod mechanism and the third connecting rod mechanism.

[0052] Refer to Figure 7 and Figure 10 , the second connecting rod 42 is approximately T-shaped. The fork rod 422 protrudes from the side of the main body section 423 relatively far from the third rocker 41. One end of the fourth rocker 54 relatively far from the shelf 51 is hinged to one end of the fork rod 422 relatively far from the main body section 423.

[0053] Refer to Figures 11 - 12, for the hinge point between the first rocker 31 and the hip assembly 20, refer to point A1; for the hinge point between the first rocker 31 and the first link 33, refer to point A2; for the hinge point between the third rod segment 321 of the second rocker 32 and the hip assembly 20, refer to point B1, the first link 33 is rotatably connected to the fourth rod segment 322 of the second rocker 32, and the connection point is at B2; the third rocker 41 is rotatably connected to the link fixing member 43, and the connection point is at C1, and the link fixing member 43 is fixedly connected to the fourth rod segment 322 of the second rocker 32; for the hinge point between the third rocker 41 and the second link 42, refer to point C2; for the hinge point between the second link 42 and the first link 33, refer to point D1; for the hinge point between the fourth rocker 54 and the fork rod 422, refer to point E1; for the hinge point between the fourth rocker 54 and the shelf 51, refer to point E2, and for the hinge point between the shelf 51 and the leg support segment 331, refer to point F1.

[0054] Refer to Figures 8 - 10 , optionally, the fork rod 422 and the second link 42 are an integrally formed link member.

[0055] Figures 2 - 7 The shown seat frame 100 has a sitting posture state, a transition state and a leisure posture state; Figure 1 、 Figures 8 - 12 The shown seat frame 100 further includes a backrest assembly, and the backrest assembly is movably arranged relative to the hip assembly 20, and has a sitting posture state, a transition state, a leisure posture state and a lying posture state. Figures 2 - 7 The shown seat frame 100 and Figure 1 、 Figures 8 - 12 The shown seat frame 100 has the same expansion and retraction assembly 30, linkage assembly 40 and leg assembly 50. In two embodiments, the connection relationships of the hip assembly 20, expansion and retraction assembly 30, linkage assembly 40 and leg assembly 50 are the same. Taking Figure 1 、 Figures 8 - 12 the shown seat frame 100 as an example, when the seat frame 100 is in the sitting posture state, transition state or leisure posture state, the relative position between the backrest assembly and the hip assembly 20 restricts the user's upper torso to be straight. When the seat frame 100 is in the lying posture, the backrest assembly tilts backward relative to the hip assembly 20, thereby allowing the user's upper torso to lie down.

[0056] As Figures 8 - 11As shown, the fuselage assembly 10 includes a support unit 11 and a linkage rocker 12. The support unit 11 includes an installation side plate 111 and a backrest load-bearing member 112 that are fixedly connected. The backrest assembly includes a posture-changing rod group and a backrest rocker 73. The posture-changing rod group, the backrest rocker 73, and the hip assembly 20 are connected to form a fourth link mechanism. The installation side plate 111 is hinged to the linkage rocker 12, and the backrest load-bearing member 112 is hinged to the backrest rocker 73. The support unit 11, the linkage rocker 12, the posture-changing rod group, and the backrest rocker 73 form a fifth link mechanism. Both the fourth link mechanism and the fifth link mechanism are four-link mechanisms.

[0057] Specifically, the backrest load-bearing member 112 is hinged between the two ends of the backrest rocker 73. One end of the backrest rocker 73 protrudes above the top of the hip assembly 20, that is, the side of the hip assembly 20 facing away from the ground. The other end extends below the bottom of the hip assembly 20 and is connected to the posture-changing rod group. And the backrest rocker 73 is hinged to the hip assembly 20. The posture-changing rod group includes a posture-changing rocker 71 and a posture-changing link 72. The posture-changing rocker 71 is hinged to the hip assembly 20 and the posture-changing link 72. The posture-changing link 72 is hinged to the linkage rocker 12 and the backrest rocker 73. Thus, the four-link mechanism formed by the hip assembly 20, the posture-changing rocker 71, the posture-changing link 72, and the backrest rocker 73 is the fourth link mechanism, and the four-link mechanism formed by the posture-changing link 72, the linkage rocker 12, the support unit 11, and the backrest rocker 73 is the fifth link mechanism.

[0058] Refer to Figures 11 - 12 , the hinge point of the posture-changing rocker 71 and the hip assembly 20 is referred to as point G1, the hinge point of the posture-changing rocker 71 and the posture-changing link 72 is referred to as point G2, the hinge point of the backrest rocker 73 and the backrest load-bearing member 112 is referred to as point H2, the hinge point of the backrest rocker 73 and the hip assembly 20 is referred to as point H1, the hinge point of the backrest rocker 73 and the posture-changing link 72 is referred to as point H3, the hinge point of the linkage rocker 12 and the posture-changing link 72 is referred to as point J1, and the hinge point of the linkage rocker 12 and the installation side plate 111 is referred to as point J2. Point G2 and point H3 are respectively located at the two ends of the posture-changing link 72. Point J1 is located between point G2 and point H3. Point H1 is located between point H2 and point H3.

[0059] For Figure 1 , Figures 8 - 12For the seat frame 100 shown, when the drive assembly 60 drives the footrest device to fully extend so that the seat frame 100 switches to the leisure position state, the drive assembly 60 can continue to output power to the drive rod group. After that, the footrest device will maintain a fixed form and be relatively fixed to the hip assembly 20, that is, the hip assembly 20, the retractable assembly 30, the linkage assembly 40 and the leg assembly 50 are relatively fixed. The power of the drive assembly 60 acting on the drive rod group will drive the hip assembly 20, the retractable assembly 30, the linkage assembly 40 and the leg assembly 50 to move forward synchronously relative to the support unit 11. The linkage rocker 12 also rotates as the posture-changing rod group and the hip assembly 20 move forward, and drives the backrest rocker 73 to rotate relative to the backrest load-bearing member 112 through the posture-changing link 72, thereby driving the backrest load-bearing member 112 to recline backward. Finally, the seat frame 100 switches to Figures 11 - 12 the lying posture state shown.

[0060] Referring to Figure 6 and Figures 11 - 12 , the link fixing member 43 includes two fixing member hinge portions 431. One of the fixing hinge portions serves as the hinge position between the third rocker 41 and the link fixing member 43, and the other fixing hinge portion serves as the hinge position between the first link 33 and the link fixing member 43; referring to Figure 6 and Figures 11 - 12 , the main body section 423 includes two link hinge portions 421. One of the link hinge portions 421 serves as the hinge position between the third rocker 41 and the second link 42, and the other link hinge portion 421 serves as the hinge position between the first link 33 and the second link 42. Among them, the distance between the two link hinge portions 421 is greater than the distance between the two fixing member hinge portions 431.

[0061] Referring to Figures 3 - 4 and Figures 6 - 7 and Figures 9 - 11 , the fourth rocker 54 is arranged crosswise with the leg support section 331. The leg support section 331 is hinged to the front end of the shelf 51, and the fourth rocker 54 is hinged to the rear end of the shelf 51. When the seat frame 100 switches to the leisure position or the lying posture, the end of the shelf 51 relatively far from the hip assembly 20 is the front end of the shelf 51, and the end of the shelf 51 relatively close to the hip assembly 20 is the rear end of the shelf 51. The seat frame 100 of the present invention has the following morphological characteristics: when the seat frame 100 is in any one of the sitting posture, the leisure position or the lying posture state, the posture of the shelf 51 generally remains stable. The top surface of the shelf 51 is used to carry the leg rest 52. Generally speaking, the top surface of the shelf 51 always remains substantially parallel to the ground. Even when the seat frame 100 switches to the lying posture state, the top surface of the shelf 51 only tilts slightly relative to the horizontal direction. Therefore, the front end of the shelf 51 is always the end of the shelf 51 far from the hip assembly 20, and the rear end of the shelf 51 is always the end of the shelf 51 close to the hip assembly 20.

[0062] Refer to Figures 1 - 3 、 Figure 8 and, at the same time, also refer to Figure 5 and Figure 7 、 Figure 9 and Figure 10 When the seat frame 100 is in the sitting posture state, a receiving gap for receiving the shelf 51 and the leg rest 52 is formed between the leg support section 331 and the hip assembly 20. The reason for the formation of this receiving gap is that in the sitting posture state, the first link 33 is the member of the first link mechanism that is closest to the ground and farthest from below the hip assembly 20, and the leg support section 331 is an extended rod section of the first link 33. The third rocker 41 is always arranged side by side with the first link 33, so that the dimensional span of the second link mechanism in the vertical direction is maintained stable. The second link 42, the fork rod 422 and the fourth rocker 54 cooperate to slightly change the angle of the shelf 51, so as to stably maintain the posture of the shelf 51 and the leg rest 52 approximately parallel to the horizontal plane.

[0063] Among the three four-link mechanisms formed by the seat frame 100, the first link mechanism is generally closest to a parallelogram link mechanism. The first link mechanism refers to the four-link mechanism sequentially connected by points A1 - A2 - B2 - B1 as shown in Figure 12 ; the second link mechanism refers to the four-link mechanism sequentially connected by points B2 - C1 - C2 - D1 as shown in Figure 12 ; the third link mechanism refers to the four-link mechanism sequentially connected by points E1 - E2 - F1 - D1 as shown in Figure 12 . The distance between points E1 and E2 is less than the distance between points F1 and D1. During the process of the footrest device changing its form, the third rocker 41 almost always remains arranged side by side with the first link 33, that is, the length directions of the third rocker 41, the first link 33 and the hip assembly 20 are almost always the same. The rotation of the second link 42 relative to the first link 33 and the third rocker 41 is the key to causing the deformation of the third link mechanism. The fourth rocker 54 and the leg support section 331 are cross-arranged to control the deformation amplitude of the third link mechanism, specifically to control the pitching swing amplitude of the shelf 51, so that the shelf 51 and the hip assembly 20 tend to be as parallel as possible. If the seat frame 100 is observed from the side, the shelf 51 and the leg rest 52 approximately move along a curved trajectory in the vertical plane. The change amplitude of the angle between the shelf 51 and the ground is limited, and the change amplitude of the angle between the leg rest 52 and the ground is also limited. From the leisure posture state to the sitting posture state, the shelf 51 mainly moves in the vertical and horizontal directions, and the leg rest 52 generally remains approximately parallel to the ground. From the leisure posture state to the lying posture state, the footrest device and the hip assembly 20 remain relatively fixed, and the two swing backward relative to the ground as a whole, and the swing angle is limited.

[0064] Furthermore, refer toFigures 1 - 11 , the first rocker 31 includes a first rod segment 311 and a second rod segment 312 that are bent and connected. The second rocker 32 includes a third rod segment 321 and a fourth rod segment 322 that are bent and connected. The first rod segment 311 and the third rod segment 321 are hinged to the hip assembly 20, and the second rod segment 312 and the fourth rod segment 322 are hinged to the first link 33. As Figures 1 - 3 , Figure 8 shown, when the seat frame 100 is in the sitting position, the first rocker 31 and the second rocker 32 are folded in the hip assembly 20. At this time, the first rod segment 311 and the third rod segment 321 rest on the side of the hip assembly 20, and the second rod segment 312 and the fourth rod segment 322 extend away from the hip assembly 20 and towards the ground. A rocker avoidance angle is formed between the fourth rod segment 322 and the third rod segment 321 to avoid the first rocker 31, and a leg rest 52 avoidance angle is formed between the second rod segment 312 and the first rod segment 311 to avoid the leg rest 52. The openings of the rocker avoidance angle and the leg rest 52 avoidance angle both open towards the front of the seat frame 100.

[0065] With such a setting, when the seat frame 100 is in the sitting position, the drive rod group constructs two U-shaped gaps with openings facing forward. Among them, the first U-shaped gap is formed between the first rod segment 311 and the first link 33, and the second U-shaped gap is formed between the third rod segment 321 and the first link 33. The second U-shaped gap accommodates at least a part of the first rocker 31 through the rocker avoidance angle, and the first U-shaped gap accommodates at least a part of the leg assembly 50 including the leg rest 52 through the leg rest 52 avoidance angle. The first U-shaped gap is suitable for the shelf 51 and the leg rest 52 to retract below the hip assembly 20 in a posture approximately parallel to the ground, and it will not cause interference between the leg rest 52 and the drive rod group.

[0066] See Figure 1 , Figures 8 - 10 , in some embodiments, the deployment and retraction assembly 30 further includes an extension assist member 81 connecting the first rocker 31 and the second rocker 32. The extension assist member 81 can be a spring. When the seat frame 100 is in Figure 1 and Figure 8When in the sitting posture shown, the first rocker 31 and the second rocker 32 are folded towards the hip assembly 20. That is, when the first rod segment 311 and the third rod segment 321 are juxtaposed and docked on the side of the hip assembly 20, the extension assist member 81 elastically elongates and reaches its maximum length. At this time, the pulling force of the extension assist member 81 acting on the first rocker 31 causes the first rod segment 311 to be closer to the hip assembly 20, and the line of action of the pulling force of the extension assist member 81 acting on the second rocker 32 coincides with the third rod segment 321. Thus, the extension assist member 81 locks the third rod segment 321, restricting the abduction rotation of the first rocker 31 and the second rocker 32 relative to the hip assembly 20. With such a setting, the stability of the seat frame 100 in the sitting posture can be ensured, preventing the seat frame 100 from accidentally changing its shape. When the drive assembly 60 applies power to the drive rod group, causing the line of action of the pulling force of the extension assist member 81 acting on the second rocker 32 to no longer coincide with the third rod segment 321, the extension assist member 81 elastically retracts and deforms to promote the abduction rotation of the first rocker 31 and the second rocker 32 relative to the hip assembly 20, thereby causing the drive rod group to gradually extend and deform from the curled state. When the seat frame 100 switches to the leisure posture and the lying posture, the extension assist member 81 can play a role in maintaining the abduction of the first rocker 31 and the second rocker 32 relative to the hip assembly 20, thus having the effect of keeping the leg assembly suspended to stably support the legs and feet.

[0067] Furthermore, the seat frame 100 further includes an elastic auxiliary member 82 connecting the fourth link mechanism and the support unit 11. Specifically, the elastic auxiliary member 82 can be a spring, and the two ends of the elastic auxiliary member 82 are respectively connected to the hip assembly 20 and the backrest load-bearing member 112. The elastic auxiliary member 82 has a first elongated state and a second elongated state, and the length of the elastic auxiliary member 82 changes from long to short from the first elongated state to the second elongated state. When the elastic auxiliary member 82 is in the first elongated state, the seat frame 100 is in the Figure 11 lying posture shown, at this time the drive rod group abducts relative to the hip assembly 20, the footrest device is fully extended and the backrest rocker 73 reclines backward, and the upper torso of the user can lie down. When the elastic auxiliary member 82 is in the second elongated state, the seat frame 100 is in the Figure 10 leisure posture shown, at this time the drive rod group abducts relative to the hip assembly 20, the footrest device is fully extended and the backrest rocker 73 is reset, and the upper torso of the user is straightened. Subsequently, the backrest rocker 73 is fixed relative to the backrest load-bearing member 112, and the shapes of the fourth link mechanism and the fifth link mechanism are kept fixed, while the footrest device will move relative to the hip assembly 20 under the drive of the drive assembly 60 until the seat frame 100 switches to the sitting posture. The elastic auxiliary member 82 drives the fourth link mechanism to deform by contraction, causing the hip assembly 20 to move backward, and the backrest rocker 73 rotates relative to the backrest load-bearing member 112 to reset the backrest.

[0068] Therefore, the morphological transformation process of the seat frame 100 is as follows:

[0069] 1. When the seat frame 100 is sequentially switched from the sitting position to the leisure position and the lying position, first, the footrest device extends relative to the hip assembly 20, and the expansion and contraction assembly 30 extends to drive the linkage assembly 40 and the leg assembly 50. The first link mechanism, the second link mechanism, and the third link mechanism deform synchronously. The fourth link mechanism and the fifth link mechanism are constrained by the elastic auxiliary member 82 and remain fixed until the leisure position is switched. Then, the first link mechanism, the second link mechanism, and the third link mechanism remain fixed, the footrest device is fixed relative to the hip assembly 20, and the power of the driving assembly 60 acting on the driving rod group overcomes the elastic force of the elastic auxiliary member 82. The elastic auxiliary member 82 is stretched passively, and the fourth link mechanism and the fifth link mechanism deform, so that the seat frame 100 is switched from the leisure position state to the lying position state;

[0070] 2. When the seat frame 100 is sequentially switched from the lying position state to the leisure position and the sitting position state, first, the elastic auxiliary member 82 contracts first and applies a force to the fourth link mechanism. The fourth link mechanism and the fifth link mechanism deform and move, driving the backrest rocker 73 to rotate and reset relative to the backrest load-bearing member 112, while the footrest device is fixed relative to the hip assembly 20, and the first link mechanism, the second link mechanism, and the third link mechanism do not deform until the leisure position is switched. Then, the fourth link mechanism and the fifth link mechanism are both fixed under the constraint of the elastic auxiliary member 82, the footrest device is pulled by the driving assembly 60 and retracts, and the first link mechanism, the second link mechanism, and the third link mechanism deform synchronously, so that the seat frame 100 is switched from the leisure position state to the sitting position state.

[0071] Further, referring to Figures 1 - 11 , the hip assembly 20 includes a first limiting portion 21 and a second limiting portion 22, and the support unit 11 includes a third limiting portion 1111 provided on the mounting side plate 111 and a fourth limiting portion 1121 provided on the backrest load-bearing member 112. When the seat frame 100 is in the leisure position and the lying position states, the first limiting portion 21 stops the driving rod group, as shown in Figure 6 and Figure 10 . At this time, the outward expansion amplitude of the driving rod group relative to the hip assembly 20 reaches the maximum; when the seat frame 100 is in the sitting position state, the second limiting portion 22 stops the driving rod group, as shown in Figures 1 - 2 , Figure 8 . At this time, the driving rod group is fully curled relative to the hip assembly 20, and the first rocker 31 and the second rocker 32 are retracted into the hip assembly 20; when the seat frame 100 is in the sitting position, the transition state, and the leisure position, the third limiting portion 1111 stops the linkage rocker 12, and the fourth link mechanism and the fifth link mechanism are both fixed, as shown in Figure 1 , Figures 9 - 10As shown; when the seat frame 100 switches from the leisure position to the reclining position, the linkage rocker 12 leaves the third limiting portion 1111, and the fourth link mechanism and the fifth link mechanism deform. Until the seat frame 100 switches to the reclining position, the fourth limiting portion 1121 stops the backrest rocker 73, and the fourth link mechanism and the fifth link mechanism are fixed again in a new form.

[0072] The effects of the present utility model are as follows: The first link mechanism, the second link mechanism and the third link mechanism are interrelated. When the first link mechanism deforms, it drives the second link mechanism and the third link mechanism to deform synchronously. During the process of the seat frame 100 switching from the leisure position or the reclining position to the sitting position, the shelf 51 and the leg rest 52 carried by the shelf 51 can both maintain a substantially stable posture. The leg rest 52 approximately remains parallel to the ground. The shelf 51 is moved through the linkage and cooperation of the first link mechanism, the second link mechanism and the third link mechanism. The rotation amplitude of the shelf 51 is very small or hardly rotates. Finally, the leg rest 52 is retracted under the hip assembly 20 in a posture approximately parallel to the ground. Therefore, the distance from the hip assembly 20 to the ground can be shortened to accommodate the leg rest 52. The decrease in the height of the hip assembly 20 improves the comfort of the multifunctional seat. The surface of the leg rest 52 for supporting the legs is hidden under the hip assembly 20, reducing the probability of the surface of the leg rest 52 being bruised or scratched by external objects.

[0073] Refer to Figure 1 and Figure 13 , in some embodiments, the seat frame 100 further includes a balance link 90. The number of backrest assemblies is two. The two backrest assemblies are spaced apart and arranged facing each other in the left and right orientations of the seat frame 100. The two backrest assemblies each have a backrest rocker 73. The two backrest rockers 73 are spaced apart and arranged facing each other in the left and right orientations of the seat frame 100. Both ends of the balance link 90 are fixedly connected to the backrest rockers 73 of the two backrest assemblies respectively. With such a setting, the two backrest assemblies can achieve synchronous flipping and synchronous reclining, that is, the backrest assembly on the left side of the hip assembly 20 and the backrest assembly on the right side of the hip assembly 20 can maintain synchronous movement, and the amplitudes of the flipping and reclining movements of the two backrest assemblies are equal. Furthermore, in the front-rear direction of the seat frame 100, the left and right sides of the backrest cushion are ensured to be in the same position, eliminating the jerks when the backrest assembly and the backrest cushion move, and helping to maintain the balance and stability of the user's upper body trunk. Both ends of the balance link 90 are fixedly connected to the two backrest rockers 73 respectively by self-tapping screws. Of course, they can also be fixedly connected by welding, riveting and other methods.

[0074] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0075] Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. As long as appropriate changes and modifications are made within the scope of the spirit of the present utility model, they fall within the scope of protection required by the present utility model.

Claims

1. A seat frame, characterized in that: include Fuselage assembly (10); A hip assembly (20) mounted on the body assembly (10); The stowage and extension assembly (30) comprises a drive rod assembly, wherein the drive rod assembly is movably connected to the hip assembly (20) to form a first connecting rod mechanism; A linkage assembly (40) comprises a linkage rod group and a connecting rod fixing member (43), wherein the linkage rod group, the driving rod group and the connecting rod fixing member (43) are movably connected to form a second connecting rod mechanism, and the connecting rod fixing member (43) is installed on the driving rod group; The leg assembly (50) comprises a shelf (51) and a leg connecting rod, wherein the shelf (51), the leg connecting rod and the driving rod group are movably connected to form a third connecting rod mechanism, and the leg connecting rod, the linkage rod group and the driving rod group share a connecting rod component.

2. The seat frame according to claim 1, characterized in that: The driving rod group comprises a first rocking rod (31), a second rocking rod (32) and a first connecting rod (33). The first rocker (31) and the second rocker (32) are hinged to the hip assembly (20), and both are rotatably connected to the first connecting rod (33). A four-bar mechanism formed by the first rocker (31), the first connecting rod (33), the second rocker (32) and the hip assembly (20) is the first connecting rod mechanism.

3. The seat frame according to claim 2, characterized in that: The connecting rod fixing member (43) is fixedly connected to the second rocking arm (32) or the first rocking arm (31).

4. The seat frame according to claim 2, characterized in that: The retraction and extension assembly (30) also includes an extension assist member (81) connecting the first rocker (31) and the second rocker (32), and the extension assist member (81) is used for elastic deformation to promote the first rocker (31) and the second rocker (32) to rotate outward relative to the hip assembly (20), and can maintain the first rocker (31) and the second rocker (32) to be abducted relative to the hip assembly (20).

5. The seat frame according to claim 2, characterized in that: The first rocker (31) comprises a first rod segment (311) and a second rod segment (312) which are bent and connected, the second rocker (32) comprises a third rod segment (321) and a fourth rod segment (322) which are bent and connected, the first rod segment (311) and the third rod segment (321) are hinged to the hip assembly (20), and the second rod segment (312) and the fourth rod segment (322) are hinged to the first connecting rod (33); When the first rocker (31) and the second rocker (32) are folded into the hip assembly (20): The first rod segment (311) and the third rod segment (321) are parked at the side of the hip component (20), the fourth rod segment (322) and the third rod segment (321) form an angle to avoid the first rocker (31), and the second rod segment (312) and the first rod segment (311) form an angle to avoid the leg component (50).

6. The seat frame according to claim 1, characterized in that: The linkage rod group comprises a third rocker (41) and a second connecting rod (42). The driving rod group comprises a second rocking rod (32) and a first connecting rod (33), the second rocking rod (32) is hinged between the first connecting rod (33) and the hip assembly (20), the connecting rod fixing member (43) is fixed to the second rocking rod (32), the third rocking rod (41) is hinged to the connecting rod fixing member (43) and the second connecting rod (42), the first connecting rod (33) is hinged to the second connecting rod (42), A four-bar mechanism formed by the third rocker (41), the second connecting rod (42), the first connecting rod (33) and the connecting rod fixing member (43) is the second connecting rod mechanism.

7. The seat frame according to claim 6, characterized in that: The second connecting rod (42) includes a main body section (423) and a fork rod (422) which are fixedly connected, the main body section (423) is hinged to the third rocker (41) and the first connecting rod (33), the leg connecting rod includes a fourth rocker (54) hinged to the shelf (51) and the fork rod (422), the first connecting rod (33) includes a leg supporting section (331) hinged to the shelf (51), The fourth rocker (54), the shelf (51), the fork rod (422) and the leg support section (331) are movably connected to form a four-bar mechanism, which is the third connecting rod mechanism. The component formed by the fixed connection between the fork rod (422) and the second connecting rod (42) is used as a shared connecting rod component of the leg connecting rod and the linkage rod group.

8. The seat frame according to claim 7, characterized in that: The fork rod (422) and the second connecting rod (42) are integrally formed connecting rod components; and / or, The fourth rocker (54) intersects with the leg support section (331), the leg support section (331) is hinged to the front end of the shelf (51), and the fourth rocker (54) is hinged to the rear end of the shelf (51).

9. The seat frame according to claim 1, characterized in that: The fuselage assembly (10) comprises a support unit (11) and a linkage rocker (12); the seat frame further comprises a posture changing lever group and a back support rocker (73); the posture changing lever group, the back support rocker (73) and the hip assembly (20) are connected to form a fourth connecting rod mechanism; the support unit (11) is hinged to the linkage rocker (12) and the back support rocker (73); the support unit (11), the linkage rocker (12), the posture changing lever group and the back support rocker (73) form a fifth connecting rod mechanism.

10. The seat frame according to claim 9, characterized in that: The support unit (11) is hinged between the two ends of the back support rocker (73), one end of the back support rocker (73) protrudes from the top of the hip component (20), and the other end extends to the bottom of the hip component (20) and is connected to the posture changing rod group; and / or, The posture-changing rod group comprises a posture-changing rocker (71) and a posture-changing connecting rod (72); the posture-changing rocker (71) is hinged to the hip assembly (20) and the posture-changing connecting rod (72); the posture-changing connecting rod (72) is hinged to the linkage rocker (12) and the back-supporting rocker (73); and a four-bar mechanism formed by connecting the support unit (11), the linkage rocker (12), the posture-changing connecting rod (72) and the back-supporting rocker (73) is the fifth connecting rod mechanism; and / or, The fourth connecting rod mechanism is a four-bar mechanism, and the seat frame also includes an elastic auxiliary member (82) connecting the fourth connecting rod mechanism and the support unit (11), and the elastic auxiliary member (82) has a first elongated state and a second elongated state with a decreasing length. When the elastic auxiliary member (82) is in the first elongated state, the drive rod group is abducted relative to the hip component (20) and the back support rocker (73) is tilted back. When the elastic auxiliary member (82) is in the second elongated state, the drive rod group is abducted relative to the hip component (20) and the back support rocker (73) is reset.

11. The seat frame according to claim 9, characterized in that: The number of the back support rockers (73) is two, and the two back support rockers (73) are spaced apart in the left-right orientation of the seat frame. The seat frame also includes a balancing link (90), and the two ends of the balancing link (90) are respectively fixedly connected to the two back support rockers (73).

12. A multifunctional seat, characterized in that: It comprises a seat frame as described in any one of claims 1 to 11, and also comprises a driving assembly (60), wherein the driving assembly (60) is installed on the fuselage assembly (10) and connected to the stowage and deployment assembly (30), and is used for driving the stowage and deployment assembly (30) to extend and retract to send out and retract the shelf (51).

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