Automatically retractable movable seat frame and sofa

Abstract

Disclosed in the present application are an automatically retractable movable seat frame and a sofa. The automatically retractable movable seat frame comprises at least one extension device, which comprises: a linkage mechanism comprising an elastic driving member, a rotary bracket and a linkage bracket, the elastic driving member being assembled between the rotary bracket and the linkage bracket; a leg mechanism hinged to a front end of the linkage bracket, wherein a traction connecting rod member is hinged between the rotary bracket and the leg mechanism; a seat mechanism, which is hinged to a rear end of the leg mechanism; and a rotating mechanism, which is connected to the rotary bracket, and is configured to drive the rotary bracket to rotate, such that the extension device is switched between a sitting-posture state and a TV-posture state. The elastic driving member can extend and retract along with the rotation of the rotary bracket, and when the rotary bracket rotates to a predetermined position, the elastic driving member can drive the rotary bracket to rotate, thereby retracting the leg mechanism.

Description

Automatic recovery movable seat frame and sofa TECHNICAL FIELD

[0001] The present application relates to the technical field of furniture, in particular to an automatic recovery movable seat frame and sofa. BACKGROUND

[0002] With the improvement of people's living standards, multifunctional sofas have become widely used furniture in home life, among which multifunctional sofas can usually be adjusted to a sitting posture state, a TV posture state with only leg stretching, and a lying posture state with both legs and back fully stretched. The multifunctional sofas on the market can be divided into electric type and manual type according to their driving modes, among which the cost of the electric type is relatively high. The manual type has obvious defects: it is laborious to fold the leg mechanism, which easily brings poor user experience.

[0003] SUMMARY

[0004] In order to overcome at least one of the defects of the prior art described above, the present application provides an automatic recovery movable seat frame, which can automatically fold the leg mechanism and improve user experience.

[0005] An automatic recovery movable seat frame, comprising at least one stretching device, the stretching device comprising: a linkage mechanism comprising a driving elastic element, a rotating frame and a linkage frame, the driving elastic element being assembled between the rotating frame and the linkage frame; a leg mechanism, the leg mechanism being hinged to the front end of the linkage frame, a traction connecting rod being hinged between the rotating frame and the leg mechanism; a seat mechanism, the seat mechanism being hinged to the rear end of the leg mechanism; a rotating mechanism, the rotating mechanism being connected with the rotating frame, for driving the rotating frame to rotate, so as to switch the stretching device between a sitting posture state and a TV posture state; wherein the driving elastic element can stretch and contract following the rotation of the rotating frame, and when the rotating frame rotates to a predetermined position, the driving elastic element can drive the rotating frame to rotate, so as to fold the leg mechanism.

[0006] In the automatic recovery movable seat frame, the driving elastic element stretches and contracts following the rotation of the rotating frame, so that when the rotating frame rotates to a predetermined position, the driving elastic element can drive the rotating frame to rotate, thereby automatically folding the leg mechanism and improving user experience.

[0007] According to some embodiments of the present application, the leg mechanism comprises a first front connecting rod, a second front connecting rod, a leg mounting frame, a third front connecting rod and a fourth front connecting rod, one end of the first front connecting rod is hinged to the front end of the seat mechanism, the second front connecting rod is hinged between the other end of the first front connecting rod and the leg mounting frame, the third front connecting rod is hinged between the leg mounting frame and one end of the fourth front connecting rod, the other end of the fourth front connecting rod is hinged to the front end of the linkage frame, the traction connecting rod is hinged to the middle part of the fourth front connecting rod, and the other end of the fourth front connecting rod extends towards the seat mechanism to form an extension hinged to the seat mechanism.

[0008] According to some embodiments of the present application, the automatic recovery movable seat frame further comprises a front extension mounting frame, the second front connecting rod and the third front connecting rod are both hinged to the front extension mounting frame.

[0009] According to some embodiments of the present application, the linkage frame comprises a base, a first linkage rod, a second linkage rod, a third linkage rod and a fourth linkage rod, a front support arm is hinged between the front end of the base and the first linkage rod, a rear support arm is hinged between the rear end of the base and the first linkage rod, the rear support arm is provided with a limiting pin, the front end of the second linkage rod is hinged to the fourth front connecting rod, the rear end of the second linkage rod is hinged to one end of the third linkage rod, the other end of the third linkage rod is hinged to the first linkage rod through the fourth linkage rod, and the fourth linkage rod is provided with a limiting slot for clamping the limiting pin; if the included angle between the leg mounting frame in the current state and the leg mounting frame in the sitting state is less than or equal to 40°, the limiting pin and the limiting slot are separated, and the driving elastic member can drive the rotating frame to rotate, so that the leg mechanism is folded.

[0010] According to some embodiments of the present application, the seat mechanism comprises a seat mounting frame, the seat mounting frame is hinged to the rear end of the first front connecting rod, and the extension of the fourth front connecting rod is hinged to the seat mounting frame.

[0011] According to some embodiments of the present application, the automatic recovery movable seat frame further comprises a backrest mechanism, the backrest mechanism comprises a backrest mounting frame, a first rear connecting rod and a second rear connecting rod, the front end of the backrest mounting frame is hinged to the rear end of the seat mounting frame, one end of the first rear connecting rod and one end of the second rear connecting rod are sequentially hinged to the backrest mounting frame in the direction away from the seat mechanism, the other end of the first rear connecting rod is provided with a movable long slot, a sliding pin is slidably connected in the movable long slot, and the other end of the second rear connecting rod and the rear end of the second linkage rod are both hinged to the sliding pin.

[0012] According to some embodiments of the present application, the automatic-retractable movable seat frame further comprises a seat connecting rod hingedly connected between the front end of the backrest mounting frame and the front end of the first linkage rod, and the middle part of the seat connecting rod is hingedly connected with the middle part of the seat mounting frame.

[0013] According to some embodiments of the present application, the driving elastic member comprises at least one driving spring arranged between the rotating frame and the linkage frame.

[0014] According to some embodiments of the present application, the rotating mechanism comprises a rotating rod fixedly connected with the rotating frame.

[0015] The present application further provides a sofa comprising the automatic-retractable movable seat frame as described above.

[0016] In summary, the automatic-retractable movable seat frame provided by the present application has the following technical effects:

[0017] By the driving elastic member stretching and contracting following the rotation of the rotating frame, the driving elastic member can drive the rotating frame to rotate when the rotating frame rotates to a predetermined position, so as to automatically retract the leg mechanism and improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a structural schematic view of the automatic-retractable movable seat frame in a sitting position according to an embodiment of the present application;

[0019] Fig. 2 is another structural schematic view of the automatic-retractable movable seat frame in a sitting position according to an embodiment of the present application;

[0020] Fig. 3 is a structural schematic view of the automatic-retractable movable seat frame in a critical state according to an embodiment of the present application;

[0021] Fig. 4 is another structural schematic view of the automatic-retractable movable seat frame in a critical state according to an embodiment of the present application;

[0022] Fig. 5 is a structural schematic view of the linkage frame in a critical state according to an embodiment of the present application;

[0023] Fig. 6 is a structural schematic view of the automatic-retractable movable seat frame in a TV position according to an embodiment of the present application;

[0024] Fig. 7 is a structural schematic view of the automatic-retractable movable seat frame in a lying position according to an embodiment of the present application.

[0025] In the drawings, the reference signs have the following meanings:

[0026] 1 linkage mechanism; 11 driving elastic member; 12 rotating frame; 13 linkage frame; 131 base; 132 first linkage rod member; 133 second linkage rod member; 134 third linkage rod member; 135 fourth linkage rod member; 1351 limiting groove; 136 front support arm; 137 rear support arm; 1371 limiting pin; 14 traction connecting rod member; 2 leg mechanism; 21 first front connecting rod member; 22 second front connecting rod member; 23 leg mounting frame; 24 third front connecting rod member; 25 fourth front connecting rod member; 26 extension part; 27 front extension mounting frame; 3 seat mechanism; 31 seat mounting frame; 32 seat connecting rod member; 4 rotating mechanism; 41 rotating rod member; 5 backrest mechanism; 51 backrest mounting frame; 52 first rear connecting rod member; 521 movable long groove; 53 second rear connecting rod member. DETAILED DESCRIPTION

[0027] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application.

[0028] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application.

[0030] Referring to FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7, the application discloses an automatic recovery movable seat frame, which comprises at least one stretching device, the stretching device comprises a linkage mechanism 1, a leg mechanism 2, a seat mechanism 3 and a rotating mechanism 4, in some embodiments, the linkage mechanism 1 comprises a driving elastic member 11, a rotating frame 12 and a linkage frame 13, the driving elastic member 11 is assembled between the rotating frame 12 and the linkage frame 13; the leg mechanism 2 is hinged to the front end of the linkage frame 13, a traction connecting rod 14 is hinged between the rotating frame 12 and the leg mechanism 2; the seat mechanism 3 is hinged to the rear end of the leg mechanism 2; the rotating mechanism 4 is connected with the rotating frame 12, which is used to drive the rotating frame 12 to rotate, so as to switch the stretching device between the sitting state and the TV state; wherein the driving elastic member 11 can stretch and contract following the rotation of the rotating frame 12, when the rotating frame 12 rotates to a certain position, the driving elastic member 11 can drive the rotating frame 12 to rotate, so as to fold the leg mechanism 2. In some embodiments, by stretching and contracting of the driving elastic member 11 following the rotation of the rotating frame 12, when the rotating frame 12 rotates to a certain position, the driving elastic member 11 can drive the rotating frame 12 to rotate, so as to automatically fold the leg mechanism 2, and improve the user experience.

[0031] Referring to FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7, in some embodiments, the leg mechanism 2 comprises a first front connecting rod 21, a second front connecting rod 22, a leg mounting bracket 23, a third front connecting rod 24 and a fourth front connecting rod 25, one end of the first front connecting rod 21 is hinged to the front end of the seat mechanism 3, the second front connecting rod 22 is hinged between the other end of the first front connecting rod 21 and the leg mounting bracket 23, the third front connecting rod 24 is hinged between the leg mounting bracket 23 and one end of the fourth front connecting rod 25, the other end of the fourth front connecting rod 25 is hinged to the front end of the linkage bracket 13, the traction connecting rod 14 is hinged to the middle of the fourth front connecting rod 25, and the other end of the fourth front connecting rod 25 extends towards the seat mechanism 3 to form an extension 26 hinged to the seat mechanism 3. In some embodiments, corresponding foot pads can be installed on the leg mounting bracket 23. For the convenience of description, in this application, it is defined that when the rotating bracket 12 rotates clockwise, the stretching device switches from the sitting state to the TV state, and when the rotating bracket 12 rotates counterclockwise, the stretching device switches from the TV state to the sitting state. In some embodiments, when switching from the sitting state to the TV state, the rotating mechanism 4 drives the rotating bracket 12 to rotate clockwise, the hinged section 121 drives the fourth front connecting rod 25 to rotate upwards through the traction connecting rod 14, the third front connecting rod 24 extends forward under the drive of the fourth front connecting rod 25, at the same time, drives the first front connecting rod 21 to rotate upwards, the second front connecting rod 22 extends forward under the drive of the first front connecting rod 21, so as to make the leg mounting bracket 23 overturn upwards, so that the corresponding foot pads overturn upwards, and in the process of the rotating bracket 12 rotating clockwise, the rotating bracket 12 drives the drive elastic member 11 to stretch and contract, so that the drive elastic member 11 can provide a force along the stretching and contracting direction to the rotating bracket 12; when the rotating mechanism 4 drives the rotating bracket 12 to rotate to a predetermined position, the force provided by the drive elastic member 11 to the rotating bracket 12 along the stretching and contracting direction can drive the rotating bracket 12 to rotate counterclockwise by itself, the rotating bracket 12 drives the fourth front connecting rod 25 to rotate downwards through the traction connecting rod 14, the third front connecting rod 24 retracts backwards under the drive of the fourth front connecting rod 25, at the same time, drives the first front connecting rod 21 to rotate downwards, the second front connecting rod 22 retracts backwards under the drive of the first front connecting rod 21, so as to make the leg mounting bracket 23 and the front extension mounting bracket 27 both overturn downwards, thereby realizing automatic retraction of the leg mechanism 2 and improving the user experience.

[0032] Referring to FIG. 3, in some embodiments, the driving elastic member comprises at least one driving spring, which is arranged between the rotating frame 12 and the linkage frame 13. In some embodiments, a first assembly pin is arranged between one end of the driving spring and the rotating frame 12, and a second assembly pin is arranged between the other end of the driving spring and the linkage frame 13. In this embodiment, when the rotating mechanism 4 rotates the rotating frame 12, the rotating frame 12 can drive the driving spring to stretch, i.e., to elastically deform, so that the driving spring can provide an action force in the stretching direction to the rotating frame 12 through the first assembly pin, thereby driving the rotating frame 12 to rotate, achieving automatic folding of the leg mechanism 2. Further, the predetermined position can be any one or more positions corresponding to the rotating frame 12 during switching between the sitting state and the TV state.

[0033] Referring to FIGS. 1, 2, 3, 4, 5, 6 and 7, in some embodiments, a front extension mounting frame 27 is further included, and the second front connecting rod 22 and the third front connecting rod 24 are both hinged to the front extension mounting frame 27. In some embodiments, an extension pad is arranged on the front extension mounting frame 27. When switching from the sitting state to the TV state, the rotating mechanism 4 drives the rotating frame 12 to rotate clockwise, the rotating frame 12 drives the fourth front connecting rod 25 to rotate upward through the traction connecting rod 14, the third front connecting rod 24 is driven by the fourth front connecting rod 25 to extend forward, and the first front connecting rod 21 is driven by the third front connecting rod 24 to rotate upward, the second front connecting rod 22 is driven by the first front connecting rod 21 to extend forward, so that the leg mounting frame 23 and the front extension mounting frame 27 are flipped upward, the foot pad and the extension pad are flipped upward, the extension pad is arranged between the foot pad and the seat mechanism 3, thereby lengthening the leg mechanism 2, providing longer support to the user's legs, and further optimizing the user's experience.

[0034] Referring to FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7, in some embodiments, the linkage frame 13 comprises a base 131, a first linkage rod 132, a second linkage rod 133, a third linkage rod 134 and a fourth linkage rod 135, a front support arm 136 is hinged between the front end of the base 131 and the first linkage rod 132, a rear support arm 137 is hinged between the rear end of the base 131 and the first linkage rod 132, the rear support arm 137 is provided with a limiting pin 1371, the front end of the second linkage rod 133 is hinged to the fourth front connecting rod 25, the rear end of the second linkage rod 133 is hinged to one end of the third linkage rod 134, the other end of the third linkage rod 134 is hinged to the first linkage rod 132 through the fourth linkage rod 135, and the fourth linkage rod 135 is provided with a limiting slot 1351 for clamping the limiting pin 1371; if the included angle between the leg mounting frame 23 in the current state and the leg mounting frame 23 in the sitting state is less than or equal to 40°, the limiting pin and the limiting slot 1351 are separated, and the driving elastic member 11 can drive the rotating frame 12 to rotate, so as to fold the leg mechanism 2. In some embodiments, during the folding or unfolding of the leg mounting frame 23, the leg mounting frame 23 is flipped under the driving of the rotating frame 12 and the corresponding connecting rod; if the included angle between the leg mounting frame 23 in the current state and the leg mounting frame 23 in the sitting state is less than or equal to 40°, the driving elastic member 11 can drive the rotating frame 12 to rotate counterclockwise automatically, so as to automatically fold the leg mechanism 2; that is, when the included angle between the leg mounting frame 23 in the current state and the leg mounting frame 23 in the sitting state is less than or equal to 40°, the corresponding rotating frame 12 is in a predetermined position, specifically, referring to FIG. 3, the included angle α in FIG. 3 is the included angle between the leg mounting frame 23 in the current state and the leg mounting frame 23 in the sitting state, when the included angle α is equal to 40°, the movable seat frame is in a critical state, at this time, the driving elastic member 11 can drive the rotating frame 12 to rotate counterclockwise automatically, so as to automatically fold the leg mechanism 2; further, the included angle α can be adjusted according to actual needs, so the above-mentioned included angle can be less than or equal to 30°, 35°, 50°, 60°, etc.

[0035] Further, if the included angle between the leg mount 23 in the current state and the leg mount 23 in the sitting state is greater than 40°, the limiting pin 1371 is engaged with the limiting slot 1351. Specifically, in the process of unfolding the leg mount 23 forward, the rotating mechanism 4 drives the rotating frame 12 to rotate clockwise, drives the second linkage 133 to move forward under the driving of the fourth front linkage 25 and the driving elastic element 11, so as to drive the second linkage 133 to rotate the fourth linkage 135 through the third linkage 134. If the included angle between the leg mount 23 in the current state and the leg mount 23 in the sitting state is greater than 40°, the limiting pin 1371 is engaged in the limiting slot 1351, so that the driving force provided by the driving elastic element 11 to the rotating frame 12 cannot continue to drive the rotating frame 12 to rotate, and referring to FIGS. 6 and 7, with the rotation of the rotating frame 12, the driving force provided by the driving elastic element 11 to the rotating frame 12 can prevent the rotating frame 12 from rotating counterclockwise, so that the leg mount 23 can be reliably stopped at the corresponding position, so that the leg mount 23 has sufficient supporting force to support the user's legs.

[0036] Referring to FIGS. 2, 3, 4, 6 and 7, in some embodiments, the seat mechanism 3 includes a seat mount 31 hinged to the rear end of the first front linkage 21, and the extension part 26 of the fourth front linkage 25 is hinged to the seat mount 31. In some embodiments, a seat cushion can be assembled on the seat mount 31, and in some embodiments, the seat mount 31 is located above the linkage frame 13; in some embodiments, when the stretching device switches between the sitting state and the TV state, the leg mount 23 and the front extension mount 27 can be flipped up or down under the drive of the rotating frame 12, so as to adjust the slope between the foot pad and the extension pad and the seat cushion, so as to provide a comfortable sitting position for the user.

[0037] Referring to FIG. 2, FIG. 3, FIG. 4, FIG. 6 and FIG. 7, in some embodiments, a backrest mechanism 5 is further included, which comprises a backrest mounting frame 51, a first rear connecting rod 52 and a second rear connecting rod 53, a front end of the backrest mounting frame 51 is hinged to a rear end of the seat mounting frame 31, one end of the first rear connecting rod 52 and one end of the second rear connecting rod 53 are sequentially hinged to the backrest mounting frame 51 away from the seat mechanism 3, the other end of the first rear connecting rod 52 is provided with a movable long slot 521, a sliding pin is slidably connected in the movable long slot 521, the other end of the second rear connecting rod 53 and the rear end of the second connecting rod are both hinged to the sliding pin. In some embodiments, a back cushion is assembled on the backrest mounting frame 51; specifically, when the stretching device is switched from the sitting state to the TV state, the second connecting rod is driven by the fourth front connecting rod 25 and the driving elastic member 11 to drive the sliding pin to slide along the movable long slot 521, so that the backrest mounting frame 51 can remain unchanged when the stretching device is switched from the sitting state to the TV state; further, when the stretching device is switched between the TV state and the lying state, the second connecting rod drives the first rear connecting rod 52 to rotate through the sliding pin, drives the backrest mounting frame 51 to rotate backward or forward around the hinged point of the backrest mounting frame 51 and the second rear connecting rod 53, and adjusts the state of the backrest mounting frame 51.

[0038] Specifically, when switched from the sitting state to the TV state, the rotating mechanism 4 drives the rotating frame 12 to rotate clockwise, the rotating frame 12 drives the fourth front connecting rod 25 to rotate upward around the hinged point of the rotating frame 12 and the seat mounting frame 31 through the traction connecting rod 14, the third front connecting rod 24 is driven by the fourth front connecting rod 25 to stretch forward, at the same time drives the first front connecting rod 21 to rotate upward around the hinged point of the first front connecting rod 21 and the seat mounting frame 31, the second front connecting rod 22 is driven by the first front connecting rod 21 to stretch forward, so that the leg mounting frame 23 and the front extension mounting frame 27 are both turned upward, so that the corresponding foot pad and extension pad are turned upward, at the same time, the second connecting rod is driven by the fourth front connecting rod 25 and the driving elastic member 11 to drive the sliding pin to slide along the movable long slot 521, that is, when the foot pad is turned upward, the backrest mounting frame 51 can remain unchanged; when switched from the TV state to the lying state, the rotating mechanism 4 continues to drive the rotating frame 12 to rotate clockwise, the rotating frame 12 drives the leg mechanism 2 to move forward through the traction connecting rod 14, at the same time, the second connecting rod is driven to move forward, so that the second connecting rod drives the first rear connecting rod 52 to rotate through the sliding pin, drives the backrest mounting frame 51 to rotate backward around the hinged point of the backrest mounting frame 51 and the second rear connecting rod 53, and completes the change from the seat to the bed.

[0039] Referring to FIG. 4 and FIG. 7, in some embodiments, a seat connecting rod 32 is further included, which is hinged between the front end of the backrest mounting frame 51 and the front end of the first linkage rod 132, and the middle part of the seat connecting rod 32 is hinged with the middle part of the seat mounting frame 31. Specifically, when switching from the TV posture state to the lying posture state, the seat connecting rod 32 is driven by the backrest mounting frame 51 to rotate upward around the hinge point between the seat connecting rod 32 and the first linkage rod 132, so that the seat mounting frame 31 is lifted upward during the rotation of the seat connecting rod 32 and the backrest mounting frame 51, reducing the height difference between the foot pad and the seat pad and the back pad, and providing a better user experience.

[0040] Referring to FIG. 1, FIG. 2, FIG. 3 and FIG. 4, in some embodiments, the rotating mechanism 4 includes a rotating rod 41 fixedly connected with the rotating frame 12. In some embodiments, the rotating rod 41 can be externally connected with a handle or the like, and the user can manually rotate the rotating rod 41 through the handle or the like to rotate the rotating frame 12, so as to switch the stretching device between the sitting posture state, the TV posture state and the lying posture state. Further, in order to improve the structural strength and stability of the automatically retractable movable seat frame, the number of the stretching devices can be two, and the two stretching devices are arranged in parallel with each other. The two ends of the rotating rod 41 pass through the seat mounting frame 31 and are fixedly connected with the corresponding rotating frames 12, respectively, so that the two stretching devices are switched synchronously. In some embodiments, the driving elastic member can be arranged in any one of the stretching devices, and when the leg mechanism is automatically retracted, the driving elastic member drives the rotating frame 12 on the stretching device to rotate, and at the same time, the rotating frame 12 drives the rotating frame 12 on the other stretching device to rotate through the rotating rod 41.

[0041] The application also provides a sofa including the automatically retractable movable seat frame as described above. Specifically, the automatically retractable movable seat frame constitutes the main frame of the sofa, and the state switching of the stretching device corresponds to the state switching of the sofa.

[0042] The technical means disclosed in the application scheme is not limited to the technical means disclosed in the above embodiments, but also includes the technical solutions composed of any combination of the above technical features. It should be noted that, for ordinary skilled persons in the art, without departing from the principles of the application, some improvements and refinements can be made, which are also considered within the protection scope of the application.

Claims

1. An automatically retractable movable seat frame, comprising at least one extension device, the extension device comprising: The linkage mechanism (1) includes a driving elastic element (11), a rotating frame (12) and a linkage frame (13), wherein the driving elastic element (11) is assembled between the rotating frame (12) and the linkage frame (13); Leg mechanism (2), the leg mechanism (2) is hinged to the front end of the linkage frame (13), and a traction link (14) is hinged between the rotating frame (12) and the leg mechanism (2); A seat mechanism (3) is hinged to the rear end of the leg mechanism (2); Rotating mechanism (4), which is connected to the rotating frame (12), is used to drive the rotating frame (12) to rotate so that the extension device can switch between a sitting position and a TV position. The driving elastic element (11) can extend and retract as the rotating frame (12) rotates. When the rotating frame (12) rotates to a predetermined position, the driving elastic element (11) can drive the rotating frame (12) to rotate so that the leg mechanism (2) retracts.

2. The automatically retractable movable seat frame according to claim 1, wherein: The leg mechanism (2) includes a first front link (21), a second front link (22), a leg mounting bracket (23), a third front link (24), and a fourth front link (25). One end of the first front link (21) is hinged to the front end of the seat mechanism (3). The second front link (22) is hinged between the other end of the first front link (21) and the leg mounting bracket (23). The third front link (24) is hinged between the leg mounting bracket (23) and one end of the fourth front link (25). The other end of the fourth front link (25) is hinged to the front end of the linkage frame (13). The traction link (14) is hinged to the middle of the fourth front link (25), and the other end of the fourth front link (25) extends toward the seat mechanism (3) to form an extension (26) hinged to the seat mechanism (3).

3. The automatically retractable movable seat frame according to claim 2 further includes a front extension mounting bracket (27), wherein the second front connecting rod (22) and the third front connecting rod (24) are both hinged to the front extension mounting bracket (27).

4. The automatically retractable movable seat frame according to claim 2, wherein: The linkage frame (13) includes a base (131), a first linkage rod (132), a second linkage rod (133), a third linkage rod (134), and a fourth linkage rod (135). A front support arm (136) is hinged between the front end of the base (131) and the first linkage rod (132). A rear support arm (137) is hinged between the rear end of the base (131) and the first linkage rod (132). The rear support arm (137) is provided with a limit pin. 1371), the front end of the second linkage rod (133) is hinged to the fourth front linkage rod (25), the rear end of the second linkage rod (133) is hinged to one end of the third linkage rod (134), the other end of the third linkage rod (134) is hinged to the first linkage rod (132) through the fourth linkage rod (135), and the fourth linkage rod (135) is provided with a limiting groove (1351) that engages with the limiting pin (1371); If the angle between the leg mounting bracket (23) in the current state and the leg mounting bracket (23) in the sitting state is less than or equal to 40°, then the positioning pin separates from the limiting groove (1351), and the driving elastic element (11) can drive the rotating frame (12) to rotate so that the leg mechanism (2) retracts.

5. The automatically retractable movable seat frame according to claim 4, wherein: The seat mechanism (3) includes a seat mounting bracket (31) which is hinged to the rear end of the first front link (21), and the extension (26) of the fourth front link (25) is hinged to the seat mounting bracket (31).

6. The automatically retractable movable seat frame according to claim 5 further includes a backrest mechanism (5), the backrest mechanism (5) including a backrest mounting frame (51), a first rear connecting rod (52) and a second rear connecting rod (53), the front end of the backrest mounting frame (51) is hinged to the rear end of the seat mounting frame (31), one end of the first rear connecting rod (52) and one end of the second rear connecting rod (53) are sequentially hinged to the backrest mounting frame (51) in a direction away from the seat mechanism (3), the other end of the first rear connecting rod (52) is provided with a movable long groove (521), a sliding pin is slidably connected in the movable long groove (521), and the other end of the second rear connecting rod (53) and the rear end of the second linkage rod are both hinged to the sliding pin.

7. The automatically retractable movable seat frame according to claim 6 further includes a seat link (32), which is hinged between the front end of the backrest mounting frame (51) and the front end of the first linkage link (132), and the middle part of the seat link (32) is hinged to the middle part of the seat mounting frame (31).

8. The automatically retractable movable seat frame according to any one of claims 1-7, wherein: The driving elastic element includes at least one driving spring, which is assembled between the rotating frame (12) and the linkage frame (13).

9. The automatically retractable movable seat frame according to any one of claims 1-7, wherein: The rotating mechanism (4) includes a rotating rod (41), which is fixedly connected to the rotating frame (12).

10. A sofa comprising an automatically retractable movable seat frame as described in any one of claims 1-9.

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