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 back assembly, a linkage assembly, a leg assembly, a folding and unfolding assembly, a leg auxiliary part and a reset elastic part, and the machine body assembly is provided with a folding and unfolding driver; the linkage assembly, the hip assembly and the back assembly form a first connecting rod mechanism, and the linkage assembly, the fuselage assembly and the back assembly form a second connecting rod mechanism. The leg component is rotatably arranged on the hip component and is connected with the unfolding driver; the folding and unfolding assembly is movably arranged on the hip assembly and comprises a driven end and a folding and unfolding acting end connected with the leg assembly, and the driven end moves backwards along with the stretching of the leg assembly and the forward movement of the folding and unfolding acting end, and moves forwards along with the backward movement of the folding and unfolding acting end driven by the leg assembly; the leg auxiliary part is connected with the driven end and the machine body assembly, and the leg auxiliary part is lengthened along with forward movement of the driven end and shortened along with backward movement of the driven end; the reset elastic piece comprises an installation end connected with the machine body assembly and further comprises a reset end connected with the hip assembly and / or the back assembly.

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] The multifunctional seat can provide at least three usage postures including a sitting posture, a leisure posture and a lying posture. The sitting posture, the leisure posture and the lying posture are respectively for the user to sit down, lift the legs to relax and lie down to rest. When the user intends to lie down to rest, the multifunctional seat first extends the leg assembly to switch from the sitting posture to the leisure posture, and then reclines the back assembly to switch from the leisure posture to the lying posture. After the rest is over, the seat in the lying posture first resets the back assembly to the upright state to return to the leisure posture, and then retracts the leg assembly to return from the leisure posture to the sitting posture so that the user can get up and leave the seat.

[0003] However, some existing multifunctional seats have the problem of disordered posture transformation. When recovering from the lying posture to the sitting posture, the leg assembly may retract before the back assembly resets and stands upright, and the transformation from the lying posture to the sitting posture cannot be carried out as expected when designing the product. Summary of the Utility Model

[0004] In view of this, the utility model provides a seat frame and a multifunctional seat that can reasonably and orderly transform from the lying posture to the sitting posture to overcome the defect of disordered posture transformation of the seat frame.

[0005] The seat frame of the utility model includes a fuselage assembly, a hip assembly, a back assembly, a linkage assembly, a leg assembly, a retracting and extending assembly, a leg auxiliary and a reset elastic member; the fuselage assembly is provided with a retracting and extending driver; the back assembly is rotatably connected to the fuselage assembly and the hip assembly; the linkage assembly forms a first link mechanism with the hip assembly and the back assembly, and forms a second link mechanism with the fuselage assembly and the back assembly; the leg assembly is rotatably arranged on the hip assembly and connected to the retracting and extending driver; the retracting and extending assembly is movably arranged on the hip assembly, including a retracting and extending acting end and a driven end. The retracting and extending acting end is connected to the leg assembly, and the driven end moves backward as the leg assembly drives the retracting and extending acting end to move forward, and moves forward as the leg assembly drives the retracting and extending acting end to move backward; the leg auxiliary is connected to the driven end and the fuselage assembly, and the leg auxiliary is stretched as the driven end moves forward and shortened as the driven end moves backward; the reset elastic member includes an installation end connected to the fuselage assembly and a reset end connected to the hip assembly and / or the back assembly.

[0006] Compared with the prior art, the seat frame of the present utility model can reasonably and orderly transform from a lying position to a leisure position, and then from the leisure position to the lying position, and ensure that when transforming from the lying position to the sitting position, the back component is reset first. After transforming to the leisure position state and the back component stands upright, the leg component is then retracted. The posture transformation of the seat frame adapts to the process of the human body transforming from the lying state to the sitting state, where the human body first stands up the upper body and then bends the knee joints to get up and leave the seat.

[0007] In some embodiments, when the leg component extends and the back component reclines, the leg auxiliary member is in the first stretching state, and the potential energy of the reset elastic member has a tendency to drive the back component to swing forward until the back component stands upright; when the leg component extends and the back component stands upright, the reset elastic member contracts, and the leg auxiliary member is in the contracted state; when the leg component retracts and the back component stands upright, the reset elastic member contracts, and the leg auxiliary member is in the second stretching state.

[0008] In some embodiments, the linkage assembly includes a shared link, the shared link is located between the hip component and the fuselage component, and the shared link is shared by the first link mechanism and the second link mechanism.

[0009] In some embodiments, the linkage assembly further includes a second link and a third link. The two ends of the second link are respectively hinged to the hip component and the shared link, and the two ends of the third link are respectively hinged to the fuselage component and the shared link.

[0010] In some embodiments, the fuselage component includes a backrest seat, the back component includes a pivot part, a backrest part and a link part. The pivot part is located between the backrest part and the link part and is hinged to the backrest seat. The middle section of the link part is hinged to the hip component, and the end of the link part is hinged to the shared link.

[0011] In some embodiments, the expansion and retraction assembly includes an expansion and retraction rocker and an expansion and retraction link. The middle section of the expansion and retraction rocker is hinged to the hip component. One end of the expansion and retraction rocker is hinged to the expansion and retraction link, and the other end of the expansion and retraction rocker forms a driven end. The end of the expansion and retraction link away from the expansion and retraction rocker forms an expansion and retraction acting end.

[0012] In some embodiments, the expansion and retraction rocker includes a swing hinge part, a linkage hinge part and a driven hinge part. The swing hinge part is located between the linkage hinge part and the driven hinge part and is hinged to the hip component. The expansion and retraction link is hinged to the linkage hinge part, and the leg auxiliary member is hinged to the driven hinge part.

[0013] The length of the expansion and retraction link is greater than the distance from the linkage hinge part to the swing hinge part; and / or, the distance from the linkage hinge part to the swing hinge part is less than the distance from the driven hinge part to the swing hinge part.

[0014] In some embodiments, the fuselage assembly includes mounting side plates extending in the front-rear direction, the leg assist member includes a leg assist spring, one end of the leg assist spring is connected to the driven end, and the other end is connected to the rear end of the mounting side plate.

[0015] In some embodiments, the leg assembly includes a first rod, a second rod, a third rod, a fourth rod, a fifth rod, a sixth rod, and a seventh rod; the first rod and the second rod are hinged to the hip assembly; the third rod is hinged to the first rod and the second rod; the fourth rod is hinged to the second rod; the fifth rod is hinged to the third rod and the fourth rod; the sixth rod is hinged to the fifth rod; the seventh rod is hinged to the third rod and the sixth rod; the deployment and retraction action end is hinged to the first rod or the second rod.

[0016] In some embodiments, the deployment and retraction assembly includes a deployment and retraction rocker and a deployment and retraction link. The middle section of the deployment and retraction rocker is hinged to the hip assembly. One end of the deployment and retraction rocker is hinged to the deployment and retraction link, and the other end forms a driven end. The end of the deployment and retraction link away from the deployment and retraction rocker forms a deployment and retraction action end and is hinged to the second rod; the distance from the hinge point between the second rod and the hip assembly to the deployment and retraction action end is less than the length of the deployment and retraction link. Description of the Drawings

[0017] Figure 1 Structural schematic diagram of the seat frame in the reclined state according to an embodiment of the present invention;

[0018] Figure 2 Side view of a partial structure of the seat frame according to an embodiment of the present invention;

[0019] Figure 3 Side view of the seat frame in the sitting state according to an embodiment of the present invention;

[0020] Figure 4 Side view of the seat frame in the leisure state according to an embodiment of the present invention;

[0021] Figure 5 Side view of the seat frame in the reclined state according to an embodiment of the present invention;

[0022] Figure 6 Schematic diagram of the connection relationship of the seat frame according to an embodiment of the present invention.

[0023] Description of the Reference Numerals:

[0024] 10, fuselage assembly; 11, mounting side plate; 111, third spring hanging point; 112, link limiting portion; 12, backrest seat; 121, fourth spring hanging point; 122, back limiting portion; 13, first connecting pipe; 14, spring connecting seat; 15, motor mounting seat;

[0025] 20. Hip assembly; 21. Hip and leg bracket; 211. First spring hanging point; 212. Second spring hanging point; 213. Leg limiting part; 22. Rocker seat

[0026] 30. Back assembly; 31. Pivoting part; 32. Backrest; 33. Link part; 34. Third connecting pipe

[0027] 41. Shared link; 42. Second link; 43. Third link

[0028] 50. Leg assembly; 501. Second connecting pipe; 51. First rod; 52. Second rod; 53. Third rod; 54. Fourth rod; 55. Fifth rod; 56. Sixth rod; 57. Seventh rod

[0029] 60. Expansion and contraction assembly; 61. Expansion and contraction rocker; 611. Rocking hinge part; 612. Driven end; 613. Linkage hinge part; 62. Expansion and contraction link; 621. Expansion and contraction acting end

[0030] 70. Leg auxiliary part

[0031] 81. First return spring; 82. Second return spring

[0032] 90. Expansion and contraction driver; 91. Motor body; 92. Motor telescopic rod Detailed implementation mode

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. The term "or / and" used herein includes any and all combinations of one or more of the related listed items

[0035] The present utility model provides a seat frame and a multi-functional seat. The multi-functional seat includes a seat frame and a soft material covering the seat frame. The soft material includes a seat cushion, a leg rest, a backrest, etc. The seat frame of the present utility model can provide at least three use postures including a sitting posture, a leisure posture, and a lying posture. The sitting posture allows the user to sit down with the legs bent and the feet on the ground and the torso straight. The leisure posture allows the user to sit down with the legs extended and the feet off the ground and the torso straight. The lying posture allows the user to lie down with the legs extended and the feet off the ground and the torso reclined.

[0036] Referring to Figures 1 - 2 , Figure 6 , the seat frame of the present utility model includes a fuselage assembly 10, a hip assembly 20, a back assembly 30, a linkage assembly, a leg assembly 50, a reset elastic member, and an expansion and retraction driver 90. The fuselage assembly 10 serves as the installation base for the hip assembly 20, the back assembly 30, and the expansion and retraction driver 90. The hip assembly 20 includes a hip and leg bracket 21 and a rocker seat 22 fixedly connected. The hip and leg bracket 21 is used to support the user's hips and thighs. The back assembly 30 is used to support the user's waist and back. The linkage assembly forms a first link mechanism with the hip assembly 20 and the back assembly 30, and forms a second link mechanism with the fuselage assembly 10 and the back assembly 30. The first link mechanism and the second link mechanism are connected in series and can cooperate with each other so that when the seat frame switches between the lying posture and the leisure posture, the hip assembly 20 and the back assembly 30 can move relative to the fuselage assembly 10 simultaneously. The leg assembly 50 is rotatably connected to the hip and leg bracket 21 and is connected to the expansion and retraction driver 90. The reset elastic member includes an installation end and a reset end. The installation end is connected to the fuselage assembly 10, and the reset end is connected to at least one of the hip assembly 20 and the back assembly 30. The expansion and retraction driver 90 is used to provide the power required for the seat frame to deform and switch postures. The soft material includes a seat cushion provided on the hip and leg bracket 21.

[0037] Figure 3 , Figure 4 and Figure 5Schematically show the structural forms of the seat frame in the sitting position, the reclined position, and the lying position respectively. When the seat frame is in the sitting position, the leg assembly 50 is retracted to the side of the hip assembly 20 close to the ground, and the back assembly 30 stands upright; when the seat frame is in the reclined position, the leg assembly 50 rotates forward relative to the hip assembly 20 to the extended state, at this time the leg assembly 50 is suspended relative to the ground, and the back assembly 30 stands upright; when the seat frame is in the lying position, the leg assembly 50 remains in the extended and suspended state relative to the ground, the hip assembly 20 is displaced forward relative to the fuselage assembly 10, and the front end of the hip-leg bracket 21 away from the back assembly 30 is lifted relative to the rear end of the hip-leg bracket 21 close to the back assembly 30, and the back assembly 30 rotates relative to the hip assembly 20 to the reclined state. When the seat frame switches from the sitting position to the reclined position and then to the lying position, the power of the retraction and extension actuator 90 first acts on the leg assembly 50 to switch the seat frame to the reclined position, and then acts on the first link mechanism and the second link mechanism; when the seat frame switches from the lying position to the reclined position and then to the sitting position, the power of the retraction and extension actuator 90 first acts on the first link mechanism and the second link mechanism to switch the seat frame to the reclined position, and then acts on the leg assembly 50.

[0038] To ensure that the seat frame smoothly switches from Figure 5 the lying position shown to Figure 4 the reclined position shown, and then the seat frame switches from Figure 4 the reclined position shown to Figure 3 the sitting position shown, the seat frame of the present invention further includes a retraction and extension assembly 60 and a leg auxiliary member 70. The retraction and extension assembly 60 is movably disposed on the hip assembly 20, and includes a retraction and extension acting end 621 and a driven end 612. The retraction and extension acting end 621 is connected to the leg assembly 50, and the driven end 612 is connected to one end of the leg auxiliary member 70, and the other end of the leg auxiliary member 70 is connected to the fuselage assembly 10. The leg auxiliary member 70 includes a leg auxiliary spring, and both ends of the leg auxiliary spring respectively form both ends of the leg auxiliary member 70. When the leg assembly 50 starts to switch from the retracted state to the extended state under the external force of the retraction and extension actuator 90, the leg assembly 50 drives the retraction and extension acting end 621 to move forward. During this process, the driven end 612 moves backward and the leg auxiliary member 70 is shortened; when the leg assembly 50 starts to switch from the extended state to the retracted state under the external force of the retraction and extension actuator 90, the leg assembly 50 drives the retraction and extension acting end 621 to move backward. During this process, the driven end 612 moves forward and the leg auxiliary member 70 is elongated.

[0039] It should be noted here that the orientation indicators of "front" and "rear" involved in this specific embodiment are based on the orientation perception of the user when sitting on the seat frame / multi-functional seat. The leg assembly 50 in the extended state is located in front of the user's torso, and the back assembly 30 is located behind the user. When the retraction / extension action end 621 moves forward, that is, the retraction / extension action end 621 moves along the front as perceived by the user when sitting on the seat frame. In other words, the retraction / extension action end 621 moves leftward within the Figures 2 - 6 shown drawing. When the retraction / extension action end 621 moves backward, that is, the retraction / extension action end 621 moves along the back as perceived by the user when sitting on the seat frame. In other words, the retraction / extension action end 621 moves rightward within the Figures 2 - 6 shown drawing. Specific explanations for the orientations and moving directions of other components will not be elaborated here.

[0040] Specifically, referring to Figure 1 、 Figure 5 and Figure 6 , the linkage assembly includes a shared link 41, a second link 42, and a third link 43. The shared link 41 is located between the hip assembly 20 and the fuselage assembly 10. The two ends of the second link 42 are respectively hinged to the hip assembly 20 and the shared link 41. The two ends of the third link 43 are respectively hinged to the fuselage assembly 10 and the shared link 41. The fuselage assembly 10 includes a mounting side plate 11 and a backrest seat 12. The backrest seat 12 is fixedly connected to the rear end of the mounting side plate 11. The back assembly 30 includes a pivoting portion 31, a backrest portion 32, and a link portion 33. The pivoting portion 31 is located between the backrest portion 32 and the link portion 33 and is hinged to the backrest seat 12. One end of the link portion 33 is connected to the pivoting portion 31, and the other end of the link portion 33 is hinged to the shared link 41. The middle section of the link portion 33 between the two ends of the link portion 33 is hinged to the rear end of the hip and leg bracket 21. The four-bar mechanism formed by the hip assembly 20, the second link 42, the shared link 41, and the back assembly 30 is the first link mechanism, and the four-bar mechanism formed by the third link 43, the shared link 41, the back assembly 30, and the fuselage assembly 10 is the second link mechanism. The soft material includes a back cushion provided on the backrest portion 32.

[0041] Referring to Figure 6, the hinge point of the second link 42 and the hip and leg bracket 21 is point N, the hinge point of the second link 42 and the shared link 41 is point O, the hinge point of the third link 43 and the shared link 41 is point P, the hinge point of the third link 43 and the mounting side plate 11 is point Q, the hinge point of the shared link 41 and the end of the link part 33 is point R, the hinge point of the middle section of the link part 33 and the hip and leg bracket 21 is point S, and the hinge point of the pivot part 31 and the backrest seat 12 is point T. The four hinge points of the first link mechanism are point N, point O, point R, and point S respectively, and the four hinge points of the second link mechanism are point P, point Q, point T, and point R respectively. The link part 33 of the backrest assembly 30 and the shared link 41 are shared by the first link mechanism and the second link mechanism. With such a setting, the first link mechanism and the second link mechanism can move and deform simultaneously. When the seat frame is in the leisure position state, the leg assembly 50 has been fully extended. If the retraction and extension drive 90 continues to generate a driving force, the leg assembly 50 will remain in a state fixed relative to the hip assembly 20. Then, the hip assembly 20 moves forward relative to the fuselage assembly 10, and at the same time, the front end of the hip assembly 20 is lifted upward. Driven by the shared link 41, the backrest assembly 30 rotates backward relative to the backrest seat 12, and the backrest 32 swings backward, finally realizing the switching of the seat frame to the lying position state.

[0042] Further, referring to Figure 1 , Figures 4 - 5 , the reset elastic member includes a first reset spring 81 and a second reset spring 82. The hip and leg bracket 21 includes a first spring hanging point 211 and a second spring hanging point 212. The mounting side plate 11 includes a third spring hanging point 111. The backrest seat 12 includes a fourth spring hanging point 121. The two ends of the first reset spring 81 are respectively connected to the first spring hanging point 211 and the third spring hanging point 111, and the two ends of the second reset spring 82 are respectively connected to the second spring hanging point 212 and the fourth spring hanging point 121. The functions of the first reset spring 81 and the second reset spring 82 are the same, and both are used to apply a pulling force to the hip assembly 20 so that the hip assembly 20 obtains a movement tendency to move backward relative to the fuselage assembly 10. When the seat frame switches from the Figure 5 -shown lying position state to the Figure 4 -shown leisure position state, on the one hand, the hip assembly 20 moves backward relative to the fuselage assembly 10. On the other hand, the front end of the hip and leg bracket 21 drops somewhat, and the shared link 41 moves backward relative to the fuselage assembly 10, thus driving the backrest assembly 30 to return to the upright state. Therefore, the pulling forces of the first reset spring 81 and the second reset spring 82 acting on the hip assembly 20 contribute to the backward movement of the hip assembly 20 relative to the fuselage assembly 10, thereby contributing to the switching of the seat frame from the lying position to the leisure position and ensuring the priority reset of the backrest assembly 30.

[0043] In some other embodiments, the first return spring 81 can be cancelled and only the second return spring 82 is retained, or the second return spring 82 can be cancelled and only the first return spring 81 is retained.

[0044] Refer to Figures 1 - 2 、 Figures 4 - 5 , in some embodiments, the leg assembly 50 includes a first rod 51, a second rod 52, a third rod 53, a fourth rod 54, a fifth rod 55, a sixth rod 56 and a seventh rod 57. The first rod 51 and the second rod 52 are hinged to the front end of the hip and leg bracket 21. The third rod 53 is hinged to the first rod 51 and the second rod 52. The fourth rod 54 is hinged to the second rod 52. The fifth rod 55 is hinged to the third rod 53 and the fourth rod 54. The sixth rod 56 is hinged to the fifth rod 55. The seventh rod 57 is hinged to the third rod 53 and the sixth rod 56. The expansion and contraction action end 621 of the expansion and contraction assembly 60 is hinged to the first rod 51 or the second rod 52. The hip and leg bracket 21, the first rod 51, the second rod 52 and the third rod 53 form a four-bar linkage mechanism, and the connection lines of the four hinge points of the four-bar linkage mechanism are approximately parallelograms. Refer to Figure 6 , the hinge point of the first rod 51 and the hip and leg bracket 21 is point A, the hinge point of the second rod 52 and the hip and leg bracket 21 is point B, the hinge point of the second rod 52 and the fourth rod 54 is point C, the hinge point of the fourth rod 54 and the fifth rod 55 is point D, the hinge point of the first rod 51 and the third rod 53 is point E, the hinge point of the third rod 53 and the second rod 52 (not shown in the figure) is close to but does not coincide with point C, the hinge point of the fifth rod 55 and the third rod 53 is point F, the hinge point of the sixth rod 56 and the fifth rod 55 is point G, the hinge point of the seventh rod 57 and the sixth rod 56 is point H, and the hinge point of the seventh rod 57 and the third rod 53 is point I. The soft material includes a leg support provided on the seventh rod 57.

[0045] In Figures 1 - 6 the illustrated embodiment, the expansion and contraction action end 621 is hinged to the second rod 52, and the hinge point of the expansion and contraction action end 621 and the second rod 52 is located at point J.

[0046] Further, refer to Figure 1, the fuselage assembly 10 further includes a first connecting pipe 13 located at the rear end of the mounting side plate 11 and fixedly connected to the backrest seat 12. A spring connecting seat 14 and a motor mounting seat 15 are fixedly provided on the first connecting pipe 13. One end of the leg auxiliary spring relatively far from the driven end 612 is hinged to the spring connecting seat 14. The leg assembly 50 further includes a second connecting pipe 501 fixedly connected to the first rod 51. The back assembly 30 further includes a third connecting pipe 34 fixedly connected to the backrest 32. The retractable actuator 90 is a push rod motor, including a motor body 91 and a motor telescopic rod 92. The motor body 91 is rotatably connected to the motor mounting seat 15. One end of the motor telescopic rod 92 is located inside the motor body 91, and the other end extends out of the motor body 91 and is hinged to the second connecting pipe 501. The push rod motor can control the length of the motor telescopic rod 92 extending out of the motor body 91. When the user attempts to switch the seat frame from the sitting position to the lying position, the extension length of the motor telescopic rod 92 increases. The motor telescopic rod 92 applies a thrust to the first rod 51 through the second connecting pipe 501, thereby driving the leg assembly 50 to gradually extend from the retracted state. After the leg assembly 50 is fully extended and switched to the leisure position, the extension length of the motor telescopic rod 92 continues to increase. The motor telescopic rod 92 applies a thrust to the leg assembly 50 and the hip assembly 20 through the second connecting pipe 501, thereby driving the leg assembly 50 and the hip assembly 20 to move forward as a whole. When the user attempts to switch the seat frame from the lying position to the sitting position, the extension length of the motor telescopic rod 92 shortens. The motor telescopic rod 92 applies a pulling force to the leg assembly 50 and the hip assembly 20 through the second connecting pipe 501, thereby driving the leg assembly 50 and the hip assembly 20 to move backward as a whole and switch to the leisure position. During the process of switching from the lying position to the leisure position, the leg assembly 50 remains extended, and the leg assembly 50 is fixed relative to the hip assembly 20. Then the extension length of the motor telescopic rod 92 continues to shorten. The motor telescopic rod 92 applies a pulling force to the leg assembly 50 through the second connecting pipe 501. Next, the hip assembly 20 is fixed relative to the fuselage assembly 10, and the leg assembly 50 gradually retracts from the extended state. Finally, the seat frame is switched to the sitting position.

[0047] In some embodiments, the retractable assembly 60 includes a retractable rocker 61 and a retractable connecting rod 62. One end of the retractable rocker 61 is hinged to the retractable connecting rod 62. The other end of the retractable rocker 61 forms a driven end 612 and is connected to one end of the leg auxiliary member 70. The middle section of the retractable rocker 61 between the two ends of the retractable rocker 61 is hinged to the rocker seat 22. The end of the retractable connecting rod 62 away from the retractable rocker 61 forms a retractable acting end 621 and is hinged to the leg assembly 50. Refer to Figures 1 - 2 , Figures 5 - 6, the retractable rocker 61 includes a linkage hinge portion 613 at one end of the retractable rocker 61, a driven hinge portion at the other end of the retractable rocker 61, and a swing hinge portion 611 in the middle section of the retractable rocker 61. The hinge point between the swing hinge portion 611 and the rocker seat 22 is point L, the hinge point between the linkage hinge portion 613 and the retractable link 62 is point K, the driven hinge portion is located at the driven end 612, and the hinge point between the end of the leg auxiliary member 70 and the driven hinge portion is located at point M. The hinge point between the retractable action end 621 and the leg assembly 50 is located at point J. The length of the retractable link 62 is greater than the distance from point K to point L, and the length of the retractable link 62 is greater than the distance from point B to point J. The distance from point K to point L is less than the distance from point M to point L.

[0048] Thus, when the leg assembly 50 rotates relative to the hip assembly 20, the retractable link 62 moves substantially along the length direction of the hip-leg bracket 21, and the retractable link 62 is approximately parallel to the hip-leg bracket 21. When the leg assembly 50 switches from the retracted state to the extended state to switch the seat frame from the sitting position to the leisure position, the leg assembly 50 drives the retractable link 62 to move forward relative to the hip-leg bracket 21. Therefore, the retractable action end 621 moves forward, and the retractable rocker 61 is driven by the retractable link 62 to rotate relative to the rocker seat 22. Driven by the retractable link 62, the driven end 612 moves backward. Therefore, during the process of switching from the lying position to the leisure position, the leg auxiliary spring shortens as the driven end 612 moves backward, and the leg auxiliary spring releases a part of its elastic potential energy to assist the extension of the leg assembly 50. When the user attempts to continue to control the seat frame to switch to the lying position, the leg assembly 50 remains fully extended and fixed relative to the hip assembly 20. The leg assembly 50 and the hip assembly 20 move forward relative to the fuselage assembly 10 as a whole, and the leg assembly 50 is lifted upward. During this period, both the retractable link 62 and the retractable rocker 61 are fixed relative to the hip assembly 20, and the leg auxiliary spring is stretched again as the retractable assembly 60 moves forward. Therefore, from the sitting position to the leisure position, and then from the leisure position to the lying position, the leg auxiliary spring experiences a process of first shortening and then being stretched by the driven end 612. The retractable link 62 experiences a process of first moving forward relative to the hip bracket and then remaining stationary relative to the hip bracket. The retractable rocker 61 experiences a process of first rotating relative to the hip assembly 20 and then remaining stationary relative to the hip assembly 20.

[0049] For the existing seat frame, when the user attempts to control the seat frame to switch and reset from the lying position state to the sitting position state, the seat frame will have problems of disordered attitude transformation. There are two situations for the attitude transformation of the seat frame, which are respectively ① the back assembly 30 first resets to the upright state, and then the leg assembly 50 resets from the extended state to the retracted state; ② the leg assembly 50 first resets from the extended state to the retracted state, and then the back assembly 30 resets to the upright state. In most cases, the existing seat frame does not have a definite attitude transformation sequence, and the above two attitude transformation situations are both possible.

[0050] The seat frame of the present utility model has a definite posture transformation sequence. When the user controls the seat frame of the present utility model to switch and reset from the lying posture state to the sitting posture state, the seat frame of the present utility model can strictly follow the above-mentioned first transformation situation, that is, the back component 30 first resets to the upright state and thus switches to the leisure posture, and then the leg component 50 resets from the extended state to the retracted state and finally switches to the sitting posture. The following combines Figure 3 , Figure 4 and Figure 5 to introduce the principle of the present utility model having a definite posture transformation sequence:

[0051] Based on the structure of the seat frame of the present utility model, and referring to Figure 3 and Figure 5 simultaneously, it can be known that in hypothetical situation A: when the seat frame in the lying posture state starts to retract the leg component 50 first during the process of resetting to the sitting posture state, the pulling force of the retractable drive 90 acting on the leg component 50 will be preferentially converted into the deformation activity of the retractable component 60. The deformation activity of the retractable component 60 includes the backward movement of the retractable link 62 relative to the hip and leg bracket 21, and the rotation of the retractable rocker 61 relative to the rocker seat 22. Assuming that the retractable link 62 moves backward relative to the hip and leg bracket 21, it will drive the driven end 612 to move forward relative to the hip and leg bracket 21, thereby stretching the leg auxiliary spring. Obviously, stretching the leg auxiliary spring will consume a part of the power of the retractable drive 90;

[0052] In hypothetical situation B: when the seat frame in the lying posture state starts to reset the back component 30 to the upright state first during the process of resetting to the sitting posture state, the pulling force of the retractable drive 90 acting on the leg component 50 will be preferentially converted into the backward movement of the hip component 20 relative to the fuselage component 10. At this time, the first reset spring 81 and the second reset spring 82 can just shorten and release the elastic potential energy to help the hip component 20 move backward relative to the fuselage component 10, and during this period, the leg auxiliary spring will not be stretched. In other words, the retractable drive 90 does not need to do additional work to overcome the elastic force of the leg auxiliary spring after it is stretched.

[0053] It can be determined that, compared with the above hypothetical scenario A, hypothetical scenario B is more in line with the principle of minimum energy consumption. That is to say, the energy consumption required for the back component 30 to reset prior to the leg component 50 is less than the energy consumption required for the leg component 50 to reset prior to the back component 30. For the seat frame of the present utility model, if the leg component 50 is forced to reset prior to the back component 30, then while the driven end 612 stretches the leg auxiliary spring, it is also necessary to control the first reset spring 81 and the second reset spring 82 not to contract to ensure that the hip component 20 does not move backward, thereby ensuring that the shared link 41 does not drive the back component 30 to reset when the leg component 50 has not completed its retraction. In this case, the deployment and retraction drive 90 also needs to additionally increase the power output to maintain the shape of the first reset spring 81 and the second reset spring 82. Therefore, the seat frame of the present utility model must adopt the posture transformation sequence in which the back component 30 resets prior to the leg component 50. After the seat frame switches to the leisure position, the deployment and retraction drive 90 only needs to continue applying a pulling force to the leg component 50 and act on the deployment and retraction component 60 through the leg component 50 to move the driven end 612 forward and stretch the leg auxiliary spring. The deployment and retraction acting end 621 will move backward as the driven end 612 moves forward, thereby pulling the leg component 50 to complete its retraction.

[0054] Refer to Figure 2 and Figure 6 , in order to ensure that the deployment and retraction link 62 moves approximately in the front-rear direction parallel to the hip and leg bracket 21, the rocker seat 22 protrudes from the side of the hip and leg bracket 21 close to the ground. The hinge point L of the rocker seat 22 and the deployment and retraction rocker 61 is located below the hip and leg bracket 21. The four-bar mechanism formed by the deployment and retraction link 62, the second rod 52, the hip component 20 and the deployment and retraction rocker 61 is always a concave quadrilateral. The four hinge points of the four-bar mechanism formed by the deployment and retraction link 62, the second rod 52, the hip component 20 and the deployment and retraction rocker 61 are respectively point B, point J, point K and point L.

[0055] During the switch from the leisure position to the lying position, the leg auxiliary spring is stretched by the driven end 612. The elongation of the leg auxiliary spring is related to the structure of the deployment and retraction rocker 61. Refer to Figure 6 , the greater the ratio of the length of the line connecting point L to point M to the length of the line connecting point L to point K, the greater the elongation of the leg auxiliary spring. That is to say, the deployment and retraction link 62 only needs to move slightly along the length direction of the hip and leg bracket 21 to drive the driven end 612 to move forward or backward significantly. The greater the ratio of the length of the line connecting point L to point M to the length of the line connecting point L to point K, the more conducive it is to ensuring that the back component 30 resets to the upright state prior to the leg component 50 during the switch from the lying position to the sitting position.

[0056] Furthermore, refer to Figure 1 , Figures 3 - 6, the hip assembly 20 further includes a leg limiting portion 213 fixed to the hip and leg bracket 21, and the leg limiting portion 213 is located between point A and point B; the fuselage assembly 10 further includes a link limiting portion 112 fixed to the mounting side plate 11 and a back limiting portion 122 fixed to the backrest seat 12. The leg limiting portion 213 is used to abut against the first rod 51 when the leg assembly 50 is fully retracted, and is used to abut against the second rod 52 when the leg assembly 50 is fully extended; the link limiting portion 112 is used to abut against the third link 43 to limit the deformation movement of the first link mechanism and the second link mechanism; the back limiting portion 122 is used to abut against the link portion 33 to limit the deformation movement of the first link mechanism and the second link mechanism. During the process of the seat frame switching from the sitting position to the leisure position, the link limiting portion 112 abuts against the third link 43, and the back limiting portion 122 abuts against the link portion 33. The retraction and extension driver 90 first drives the leg assembly 50 to gradually extend, and the first rod 51 disengages from the leg limiting portion 213 until the second rod 52 abuts against the leg limiting portion 213 and then switches to the leisure position. Subsequently, the leg assembly 50 is fixed relative to the hip assembly 20, and the retraction and extension driver 90 drives the hip assembly 20 to move forward and rise, thereby driving the deformation of the first link mechanism and the second link mechanism, so that the third link 43 leaves the link limiting portion 112 and the link portion 33 leaves the back limiting portion 122. During the process of the seat frame switching from the lying position to the leisure position, the leg assembly 50 is fixed relative to the hip bracket, and the retraction and extension driver 90 drives the hip assembly 20 to move backward and descend, thereby driving the deformation of the first link mechanism and the second link mechanism until the third link 43 abuts against the link limiting portion 112 and the link portion 33 abuts against the back limiting portion 122. Subsequently, the back assembly 30 and the hip assembly 20 are fixed relative to the fuselage assembly 10, and the retraction and extension driver 90 drives the leg assembly 50 to retract so that the second rod 52 leaves the leg limiting portion 213 until the first rod 51 abuts against the leg limiting portion 213 and then switches to the sitting position state.

[0057] In some embodiments, when the seat frame is in the lying position state, the leg auxiliary member 70 is in the first stretching state, and the elastic potential energy of the reset elastic member has a tendency to drive the back assembly 30 to swing forward and reset to the upright state, and at this time the elastic potential energy of the reset elastic member reaches the maximum; when the seat frame is in the leisure position state, the reset elastic member contracts compared with the lying position state, and the leg auxiliary member 70 is in the contracted state; when the seat frame is in the sitting position state, the reset elastic member basically does not change compared with the leisure position state, and the leg auxiliary member 70 is in the second stretching state. Refer to Figures 3 - 5 , the leg auxiliary member 70 includes a leg auxiliary spring; Figure 3 In the seat frame shown, the leg auxiliary spring is in the second stretching state; Figure 4 In the seat frame shown, the leg auxiliary spring is in the contracted state; Figure 5In the seat frame shown, the leg auxiliary spring is in the first drawing state, and the length of the leg auxiliary spring in the second drawing state > the length of the leg auxiliary spring in the first drawing state > the length of the leg auxiliary spring in the contracted state. With such a setting, the leg auxiliary spring can accumulate more elastic potential energy in the sitting posture state. The leg auxiliary spring has a pulling force on the driven end 612, and the driven end 612 has a tendency to move backward. Further, the expansion and contraction link 62 has a tendency to move forward. Under this tendency, the expansion and contraction acting end 621 has a pushing force on the second rod 52, which helps the leg assembly 50 to extend.

[0058] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of 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.

[0059] Those of ordinary skill in the art of this technology should recognize that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. As long as it is within the scope of the essential spirit of the present invention, appropriate changes and variations made to the above embodiments fall within the scope of protection required by the present invention.

Claims

1. A seat frame, characterized in that, including a fuselage assembly (10) provided with an unfolding and folding driver (90); a hip assembly (20); a back assembly (30) rotatably connected to the fuselage assembly (10) and the hip assembly (20); a linkage assembly that forms a first linkage mechanism with the hip assembly (20) and the back assembly (30), and forms a second linkage mechanism with the fuselage assembly (10) and the back assembly (30); a leg assembly (50) rotatably provided on the hip assembly (20) and connected to the unfolding and folding driver (90); an unfolding and folding assembly (60) movably provided on the hip assembly (20), including an unfolding and folding acting end (621) and a driven end (612), the unfolding and folding acting end (621) is connected to the leg assembly (50), and the driven end (612) moves forward and backward as the leg assembly (50) drives the unfolding and folding acting end (621) to move forward, and moves backward and forward as the leg assembly (50) drives the unfolding and folding acting end (621) to move backward; a leg auxiliary member (70) connecting the driven end (612) and the fuselage assembly (10), the leg auxiliary member (70) is stretched as the driven end (612) moves forward, and is shortened as the driven end (612) moves backward; a reset elastic member including a mounting end connected to the fuselage assembly (10), and a reset end connected to the hip assembly (20) and / or the back assembly (30).

2. The seat frame according to claim 1, characterized in that, When the leg assembly (50) extends and the back assembly (30) reclines backward, the leg auxiliary member (70) is in a first stretching state, and the potential energy of the reset elastic member has a tendency to drive the back assembly (30) to swing forward until the back assembly (30) stands upright; When the leg assembly (50) extends and the back assembly (30) stands upright, the reset elastic member contracts, and the leg auxiliary member (70) is in a contracted state; When the leg assembly (50) folds and the back assembly (30) stands upright, the reset elastic member contracts, and the leg auxiliary member (70) is in a second stretching state.

3. The seat frame according to claim 1, characterized in that, The linkage assembly includes a shared link (41), the shared link (41) is located between the hip assembly (20) and the fuselage assembly (10), and the shared link (41) is shared by the first linkage mechanism and the second linkage mechanism.

4. The seat frame according to claim 3, characterized in that, The linkage assembly further includes a second link (42) and a third link (43), two ends of the second link (42) are respectively hinged to the hip assembly (20) and the shared link (41), and two ends of the third link (43) are respectively hinged to the fuselage assembly (10) and the shared link (41).

5. The seat frame according to claim 3, wherein, The fuselage assembly (10) includes a backrest seat (12). The back assembly (30) includes a pivot part (31), a backrest part (32) and a connecting rod part (33). The pivot part (31) is located between the backrest part (32) and the connecting rod part (33) and is hinged to the backrest seat (12). The middle section of the connecting rod part (33) is hinged to the hip assembly (20), and the end of the connecting rod part (33) is hinged to the shared connecting rod (41).

6. The seat frame according to claim 1, characterized in that, The expansion and contraction assembly (60) includes an expansion and contraction rocker (61) and an expansion and contraction connecting rod (62). The middle section of the expansion and contraction rocker (61) is hinged to the hip assembly (20). One end of the expansion and contraction rocker (61) is hinged to the expansion and contraction connecting rod (62), and the other end of the expansion and contraction rocker (61) forms the driven end (612). The end of the expansion and contraction connecting rod (62) away from the expansion and contraction rocker (61) forms the expansion and contraction acting end (621).

7. The seat frame according to claim 6, wherein, The expansion and contraction rocker (61) includes a swinging hinge part (611), a linkage hinge part (613) and a driven hinge part. The swinging hinge part (611) is located between the linkage hinge part (613) and the driven hinge part and is hinged to the hip assembly (20). The expansion and contraction connecting rod (62) is hinged to the linkage hinge part (613), and the leg auxiliary part (70) is hinged to the driven hinge part. The length of the expansion and contraction connecting rod (62) is greater than the distance from the linkage hinge part (613) to the swinging hinge part (611); and / or The distance from the linkage hinge part (613) to the swinging hinge part (611) is less than the distance from the driven hinge part to the swinging hinge part (611).

8. The seat frame according to claim 1, wherein, The fuselage assembly (10) includes a mounting side plate (11) extending in the front-rear direction. The leg auxiliary part (70) includes a leg auxiliary spring. One end of the leg auxiliary spring is connected to the driven end (612), and the other end is connected to the rear end of the mounting side plate (11).

9. The seat frame according to claim 1, characterized in that, The leg assembly (50) includes a first rod (51), a second rod (52), a third rod (53), a fourth rod (54), a fifth rod (55), a sixth rod (56), and a seventh rod (57). The first rod (51) and the second rod (52) are hinged to the hip assembly (20). The third rod (53) is hinged to the first rod (51) and the second rod (52). The fourth rod (54) is hinged to the second rod (52). The fifth rod (55) is hinged to the third rod (53) and the fourth rod (54). The sixth rod (56) is hinged to the fifth rod (55). The seventh rod (57) is hinged to the third rod (53) and the sixth rod (56). The expansion and contraction acting end (621) is hinged to the first rod (51) or the second rod (52).

10. The seat frame according to claim 9, characterized in that, The retractable and extendable assembly (60) includes a retractable and extendable rocker (61) and a retractable and extendable connecting rod (62). The middle section of the retractable and extendable rocker (61) is hinged to the hip assembly (20). One end of the retractable and extendable rocker (61) is hinged to the retractable and extendable connecting rod (62), and the other end of the retractable and extendable rocker (61) forms the driven end (612). The end of the retractable and extendable connecting rod (62) far from the retractable and extendable rocker (61) forms the retractable and extendable acting end (621) and is hinged to the second rod (52). The distance from the hinge point between the second rod (52) and the hip assembly (20) to the retractable and extendable acting end (621) is less than the length of the retractable and extendable connecting rod (62).

11. A multifunctional seat, characterized in that, The seat frame includes the seat frame according to any one of claims 1 to 10.

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