ZERO GRAVITY AND ZERO WALL SOFA FRAME

Abstract

A zero gravity and zero wall sofa frame, comprising a base, a seat frame, a first drive mechanism, a backrest assembly, a foot rest assembly, a push rod and a second drive mechanism, wherein the seat frame is movably arranged on the base, the base and the seat frame are hinged with the backrest assembly, the seat frame and the push rod are hinged with the foot rest assembly, and the second drive mechanism is connected with the push rod to drive the push rod to move back and forth relative to the seat frame. Since the sofa frame is provided with the first drive mechanism and the second drive mechanism, the foot rest assembly and the seat frame can act respectively during the state transition of the sofa frame to make the movement of the sofa consistent with the body movement habit to provide a better user experience.

Claims

1. A zero gravity and zero wall sofa frame which can be switched between a sitting position and a lying position, comprising: A base; A seat frame movably arranged on the base; A first drive mechanism to drive the base to move back and forth relative to the base, wherein the first drive mechanism is provided on the base; A backrest assembly convertible between an upright state and an inclined state, wherein the base and the seat frame are hinged with the backrest assembly, and when the seat frame moves forward relative to the base, the backrest assembly changes from the upright state to the inclined state, and when the seat frame moves backward relative to the base, the backrest assembly changes from the inclined state to the upright state; A foot rest assembly convertible between a retracted state and an extended state; and A push rod, wherein both the seat frame and the push rod are hinged to the foot rest assembly; when the push rod moves forward relative to the seat frame, the foot rest assembly is converted from the contracted state to the extended state, and when the push rod moves backward relative to the seat frame, the foot rest assembly is converted from the extended state to the contracted state; wherein, the sofa frame further comprises: A second drive mechanism that is connected with the push rod to drive the push rod to move back and forth relative to the seat frame.

2. The zero gravity and zero wall sofa frame according to claim 1, wherein the first drive mechanism is a linear module, comprising a module motor, a module rail and a module sliding block, wherein the module rail is arranged in a forward and backward direction, the module sliding block is removable on the module rail, the module rail is provided with a transmission assembly, the module motor and the module sliding block are connected through the transmission assembly to drive the module sliding block to move back and forth, and the module sliding block is fixedly connected with the seat frame.

3. The zero gravity and zero wall sofa frame according to claim 2, wherein the base is provided with two rails arranged oppositely on the left and right, and the seat frame is provided with at least two guide blocks arranged oppositely on the left and right, which are respectively in sliding fit with the two rails.

4. The zero gravity and zero wall sofa frame according to claim 3, wherein the rail is V-shaped, the rear section of the rail is arranged horizontally, and the front section of the rail is arranged obliquely upward from back to front; the seat frame is provided with at least four guide blocks, which are arranged in pairs on the left and right sides, the two guide blocks on the left are respectively in sliding fit with the front section and the rear section of the left rail, and the two guide blocks on the right are respectively in sliding fit with the front section and the rear section of the right rail.

5. The zero gravity and zero wall sofa frame according to claim 1, wherein the second drive mechanism is an electric telescopic rod, a motor of which is arranged on the seat frame, and the telescopic rod body is hinged with the push rod.

6. The zero gravity and zero wall sofa frame according to claim 1, wherein the second drive mechanism is a drive rod; The first drive mechanism is connected with the rear end of the drive rod to drive the drive rod to move back and forth, and the front end of the drive rod is hinged with the push rod.

7. The zero gravity and zero wall sofa frame according to claim 6, wherein there are two drive rods, which are arranged on the left and right oppositely.

8. The zero gravity and zero wall sofa frame according to claim 6, wherein the module sliding block is hinged with a rear end of the drive rod.

9. The zero gravity and zero wall sofa frame according to claim 1, wherein there are two foot rest assemblies which are arranged oppositely on the left and right.

10. The zero gravity and zero wall sofa frame according to claim 1, wherein the foot rest assembly comprises: a first support rod, a second support rod, a third support rod, a fourth support rod, a fifth support rod, a sixth support rod, a seventh support rod, a bracket and a swing link, wherein the starting ends of the first support rod and the fifth support rod are both hinged with the seat frame, the starting end of the second support rod is hinged with the driven end of the first support rod, the starting end of the third support rod is hinged with the driven end of the second support rod, and the starting end of the fourth support rod is hinged with the driven end of the third support rod, the starting end of the sixth support rod is hinged with the driven end of the fifth support rod, the starting end of the seventh support rod is hinged with the driven end of the sixth support rod, and the second support rod is provided with a rear fulcrum and a front fulcrum; the rear fulcrum is hinged with the middle part of the fifth support rod, the starting end of the bracket is hinged with the front fulcrum of the support rod, the starting end of the swing link is hinged with the driven end of the bracket, and the driven end of the swing link is hinged with the middle part of the sixth support rod, the fourth support rod is hinged with a middle part of the seventh support rod.

11. The zero gravity and zero wall sofa frame according to claim 10, wherein the third support rod, the seventh support rod and the bracket are all provided with support plates, and when the foot rest assembly is in the extended state, the support plates of the third support rod, the seventh support rod and the bracket are flush with each other.

12. The zero gravity and zero wall sofa frame according to claim 1, wherein the foot rest assembly comprises: a first supporting rod, a second supporting rod, a third supporting rod, a fourth supporting rod, a fifth supporting rod, a sixth supporting rod and a seventh supporting rod, wherein the starting ends of the first supporting rod and the fifth supporting rod are both hinged with the seat frame, the starting end of the second supporting rod is hinged with the driven end of the first supporting rod, the starting end of the third supporting rod is hinged with the driven end of the second supporting rod, and the starting end of the fourth supporting rod is hinged with the driven end of the third supporting rod, the starting end of the sixth supporting rod is hinged with the driven end of the fifth supporting rod, the starting end of the seventh supporting rod is hinged with the driven end of the sixth supporting rod, the middle part of the second supporting rod is hinged with the middle part of the fifth supporting rod, the middle part of the third supporting rod is hinged with the middle part of the sixth supporting rod, and the driven end of the fourth supporting rod is hinged with the middle part of the seventh supporting rod.

13. The zero gravity and zero wall sofa frame according to claim 12, wherein the third supporting rod and the seventh supporting rod are both provided with support plates, and when the foot rest assembly is in the extended state, the support plates of the third supporting rod and the seventh supporting rod are flush with each other.

14. The zero gravity and zero wall sofa frame according to claim 1, wherein there are two backrest assemblies which are arranged oppositely on the left and right.

15. The zero gravity and zero wall sofa frame according to claim 1, wherein the backrest assembly comprises: a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a sixth connecting rod and a backrest, wherein the first connecting rod is fixed on the seat frame and provided with a front fulcrum and a rear fulcrum; the starting end of the second connecting rod is hinged with the front fulcrum of the first connecting rod, the starting end of the third connecting rod is hinged with the rear fulcrum of the first connecting rod, and the starting end of the fourth connecting rod is hinged with the driven end of the third connecting rod, the driven end of the fourth connecting rod is hinged with the base, and the third connecting rod is provided with an upper fulcrum and a lower fulcrum; the connection line between the upper fulcrum, the starting end of the third connecting rod and the lower fulcrum is L-shaped; the starting end of the fifth connecting rod is hinged with the middle part of the second connecting rod; the driven end of the fifth connecting rod is hinged with the upper fulcrum, and the driven end of the sixth connecting rod is hinged with the lower fulcrum; the backrest is provided with a front fulcrum and a rear fulcrum, the driven end of the second connecting rod is hinged to the front fulcrum, and the starting end of the sixth connecting rod is hinged to the rear fulcrum of the backrest.

16. The zero gravity and zero wall sofa frame according to claim 1, wherein the sofa frame comprises a damping element, wherein the base and the seat frame are both connected with the damping element to provide a backward force to the seat frame.

17. The zero gravity and zero wall sofa frame according to claim 16, wherein the damping element is a tension spring; The base and the seat frame are fixedly connected with both ends of the tension spring respectively, and the tension spring provides backward force to the seat frame.

18. The zero gravity and zero wall sofa frame according to claim 16, wherein there are two damping elements, which are arranged oppositely on the left and right.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0033] FIG. 1 is a schematic view of a sofa frame in sitting position according to Embodiment 1;

[0034] FIG. 2 is a schematic view of a sofa frame in half-lying position according to Embodiment 1;

[0035] FIG. 3 is a schematic view of a sofa frame in lying position according to Embodiment 1;

[0036] FIG. 4 is a schematic view of a sofa frame in sitting position according to Embodiment 2;

[0037] FIG. 5 is a schematic view of a sofa frame in half-lying position according to Embodiment 2;

[0038] FIG. 6 is a schematic view of a sofa frame in lying position according to Embodiment 2;

[0039] FIG. 7 is a schematic view of a sofa frame in sitting position according to Embodiment 3;

[0040] FIG. 8 is a schematic view of a sofa frame in half-lying position according to Embodiment 3;

[0041] FIG. 9 is a schematic view of a sofa frame in lying position according to Embodiment 3.

[0042] The reference symbols in the drawing are as follows: 1first drive mechanism; 2second drive mechanism; 3base; 4seat frame; 5push rod; 6foot rest assembly; 60support plate; 61first support rod; 62second support rod; 621rear fulcrum of support rod; 622front fulcrum of support rod; 63third support rod; 64fourth support rod; 65fifth support rod; 66sixth support rod; 67seventh support rod; 68bracket; 69swing link; 61first supporting rod; 62second supporting rod; 63third supporting rod; 64fourth supporting rod; 65fifth supporting rod; 66sixth supporting rod; 67seventh supporting rod; 7backrest assembly; 71first connecting rod; 711front fulcrum of connecting rod; 712rear fulcrum of connecting rod; 72second connecting rod; 73third connecting rod; 731upper fulcrum of connecting rod; 732lower fulcrum of connecting rod; 74fourth connecting rod; 75fifth connecting rod; 76sixth connecting rod; 77backrest; 771front fulcrum of backrest; 772rear fulcrum of backrest; 773seat back; 8damping element.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The technical solution of the present invention is further described by embodiments below:

Embodiment 1

[0044] As shown in FIGS. 13, the present disclosure proposes a zero gravity and zero wall sofa frame, comprising: a first drive mechanism 1, a second drive mechanism 2, a base 3, a seat frame 4, a push rod 5, a foot rest assembly 6 convertible between a retracted state and an extended state, and a backrest assembly 7 convertible between an upright state and an inclined state. The first drive mechanism 1 is arranged on the base 3, the seat frame 4 is movable on the base 3, and the first drive mechanism 1 is connected with the seat frame 4 to drive the seat frame 4 to move forward and backward relative to the base 3; the second drive mechanism 2 is arranged on the seat frame 4, and the second drive mechanism 2 is connected with the push rod 5 to drive the push rod 5 to move back and forth relative to the seat frame 4. Both the seat frame 4 and the push rod 5 are hinged with the foot rest assembly 6. When the push rod 5 moves forward relative to the seat frame 4, the foot rest assembly 6 is converted from the contracted state to the extended state, and when the push rod 5 moves backward relative to the seat frame 4, the foot rest assembly 6 is converted from the extended state to the contracted state, and both the base 3 and the seat frame 4 are hinged with the backrest assembly 7. When the seat frame 4 moves forward relative to the base 3, the backrest assembly 7 changes from the upright state to the inclined state. When the seat frame 4 moves backward relative to the base 3, the backrest assembly 7 changes from the inclined state to the upright state.

[0045] In actual application, the sofa frame is installed inside the sofa. Wherein, the base 3 is located inside the sofa base and fixed relative to the sofa base; the seat frame 4 is located inside the sofa cushion for driving the sofa cushion to move; the foot rest assembly 6 is located inside the sofa foot rest for driving the sofa foot rest to lift and lower; the backrest assembly 7 is located inside the sofa backrest for driving the sofa backrest to change the support angle. In this embodiment, there are two foot rest assemblies 6, and the two foot rest assemblies 6 are arranged oppositely on the left and right; there are also two backrest assemblies 7, and the two backrest assemblies 7 are also arranged oppositely on the left and right. The sofa foot rest and the sofa backrest can be driven to move more stably by setting two oppositely arranged foot rest assemblies 6 and two backrest assemblies 7. In other embodiments, the number of the foot rest assembly 6 and the backrest assembly 7 may be different.

[0046] In order to be more consistent with the movement habit of human body, the sofa frame can move according to the following sequence: When the sofa frame is changing from a sitting position to a lying position, the second drive mechanism 2 is first used to drive the push rod 5 to move forward relative to the seat frame 4, so that the foot rest assembly 6 changes from the contracted state to the extended state. At this time, the sofa frame is half lying, and then the first drive mechanism 1 is used to drive the seat frame 4 to move forward relative to the base 3, so that the backrest assembly 7 changes from the upright state to the inclined state. When the sofa frame is changing from a lying position to a sitting position, the first drive mechanism 1 is used to drive the seat frame 4 to move backward relative to the base 3, so that the backrest assembly 7 can change from the inclined state to the upright state. At this time, the sofa frame is half lying, and then the second drive mechanism 2 is used to drive the push rod 5 to move backward relative to the seat frame 4, so that the foot rest assembly 6 can change from the extended state to the contracted state.

[0047] As shown in FIG. 1, in this embodiment, the first drive mechanism 1 is a linear module, comprising a module motor 11, a module rail 12 and a module sliding block 13, wherein the module rail 12 is arranged in a forward and backward direction, the module sliding block 13 is removable on the module rail 12, the module rail 12 is provided with a transmission assembly (not shown in the figure), the module motor 11 and the module sliding block 13 are connected through the transmission assembly to drive the module sliding block 13 to move forward and backward, and the module sliding block 13 is fixedly connected with the seat frame 4. When working, the module motor 11 drives the module sliding block 13 to move on the module rail 12 through the transmission assembly, thereby driving the seat frame 4 to move. Wherein, the transmission assembly may be a transmission structure of a lead screw and a lead screw nut or a belt transmission. The transmission structure mentioned above is an existing transmission assembly structure and will not be described in detail here.

[0048] In this embodiment, the second drive mechanism 2 is an electric telescopic rod, a motor of which is arranged on the seat frame 4, and the telescopic rod body is hinged with the push rod 5. When working, the motor of the electric telescopic rod drives the rod body to move through a reducer, thus driving the push rod 5 to move. It is worth mentioning that, in this embodiment, since both the first drive mechanism 1 and the second drive mechanism 2 are power sources, the sofa frame may act according to the above order or in a reverse order, and the user is free to choose it.

[0049] As shown in FIG. 2, in this embodiment, the foot rest assembly 6 comprises: a first support rod 61, a second support rod 62, a third support rod 63, a fourth support rod 64, a fifth support rod 65, a sixth support rod 66, a seventh support rod 67, a bracket 68 and a swing link 69, wherein the starting ends of the first support rod 61 and the fifth support rod 65 are both hinged with the seat frame 4, the starting end of the second support rod 62 is hinged with the driven end of the first support rod 61, the starting end of the third support rod 63 is hinged with the driven end of the second support rod 62, and the starting end of the fourth support rod 64 is hinged with the driven end of the third support rod 63, the starting end of the sixth support rod 66 is hinged with the driven end of the fifth support rod 65, the starting end of the seventh support rod 67 is hinged with the driven end of the sixth support rod 66, and the second support rod 62 is provided with a rear fulcrum 621 and a front fulcrum 622; the rear fulcrum 621 is hinged with the middle part of the fifth support rod 65, the starting end of the bracket 68 is hinged with the front fulcrum 622 of the support rod, the starting end of the swing link 69 is hinged with the driven end of the bracket 68, and the driven end of the swing link 69 is hinged with the middle part of the sixth support rod 66, the fourth support rod 64 is hinged with a middle part of the seventh support rod 67. When the foot rest assembly 6 changes from the extended state to the contracted state, the first support rod 61, the second support rod 62, the third support rod 63, the fourth support rod 64, the fifth support rod 65, the sixth support rod 66, the seventh support rod 67, the bracket 68 and the swing link 69 are folded backwards. When the foot rest assembly 6 changes from the contracted state to the extended state, the first support rod 61, the second support rod 62, the third support rod 63, the fourth support rod 64, the fifth support rod 65, the sixth support rod 66, the seventh support rod 67, the bracket 68 and the swing link 69 are deployed forward. Wherein, the foot rest assembly 6 in the extended state is relatively long and can be applied to a long sofa foot rest. It should be noted that the starting end is the stressed end of the rod, and the driven end is the end that moves after the rod is stressed.

[0050] Specifically, the third support rod 63, the seventh support rod 67 and the bracket 68 are all provided with support plates, and when the foot rest assembly 6 is in the extended state, the support plates of the third support rod 63, the seventh support rod 67 and the bracket 68 are flush with each other. Wherein, the support plates of the third support rod 63, the seventh support rod 67 and the bracket 68 are all used to support the sofa foot rest. It should be noted that, when the support plates are flush with each other, it means that the supporting planes of the support plates are at the same level.

[0051] As shown in FIG. 3, specifically, the base 3 is provided with two rails 31 arranged oppositely on the left and right, and the seat frame 4 is provided with at least two guide blocks 41 arranged oppositely on the left and right, which are respectively in sliding fit with the two rails 31. In operation, the rail 31 is used to guide the movement of the guide block 41 and thus of the seat frame 4.

[0052] More specifically, the rail 31 is V-shaped, the rear section of the rail 31 is arranged horizontally, and the front section of the rail 31 is arranged obliquely upward from back to front; the seat frame 4 is provided with at least four guide blocks 41, which are arranged in pairs on the left and right sides, the two guide blocks 41 on the left are respectively in sliding fit with the front section and the rear section of the left rail 31, and the two guide blocks 41 on the right are respectively in sliding fit with the front section and the rear section of the right rail 31. When the sofa frame is changing from a sitting position to a lying position, the seat frame 4 moves forward and upward such that it changes from a horizontal state to an inclined upward state, thereby allowing the human body to be supported more comfortably; when the sofa frame is changing from a lying position to a sitting position, the seat frame 4 is moved backward and downward such that it changes from an inclined upward state to a horizontal state.

[0053] Specifically, the backrest assembly 7 comprises: a first connecting rod 71, a second connecting rod 72, a third connecting rod 73, a fourth connecting rod 74, a fifth connecting rod 75, a sixth connecting rod 76 and a backrest 77, wherein the first connecting rod 71 is fixed on the seat frame 4 and provided with a front fulcrum 711 and a rear fulcrum 712; the starting end of the second connecting rod 72 is hinged with the front fulcrum 711 of the first connecting rod, the starting end of the third connecting rod 73 is hinged with the rear fulcrum 712 of the first connecting rod, and the starting end of the fourth connecting rod 74 is hinged with the driven end of the third connecting rod 73, the driven end of the fourth connecting rod 74 is hinged with the base 3, and the third connecting rod 73 is provided with an upper fulcrum 731 and a lower fulcrum 732; the connection line between the upper fulcrum 731, the starting end of the third connecting rod 73 and the lower fulcrum 732 is L-shaped; the starting end of the fifth connecting rod 75 is hinged with the middle part of the second connecting rod 72; the driven end of the fifth connecting rod 75 is hinged with the upper fulcrum 731, and the driven end of the sixth connecting rod 76 is hinged with the lower fulcrum 732; the backrest 77 is provided with a front fulcrum 771 and a rear fulcrum 772, the driven end of the second connecting rod 72 is hinged to the front fulcrum 771, and the starting end of the sixth connecting rod 76 is hinged to the rear fulcrum 772 of the backrest. The backrest 77 is further provided with a seat back 773 for supporting the sofa backrest. When the sofa frame is changing from a sitting position to a lying position, the first connecting rod 71, the second connecting rod 72, the third connecting rod 73, the fourth connecting rod 74, the fifth connecting rod 75, and the sixth connecting rod 76 are folded backward, and the seat back 773 changes from the upright state to the inclined state; when the sofa frame is changing from a lying position to a sitting position, the first connecting rod 71, the second connecting rod 72, the third connecting rod 73, the fourth connecting rod 74, the fifth connecting rod 75, and the sixth connecting rod 76 are deployed forward, and the seat back 773 changes from the inclined state to the upright state.

Embodiment 2

[0054] As shown in FIGS. 46, the difference between this embodiment and Embodiment 1 is that the second drive mechanism 2 is a drive rod. The first drive mechanism 1 is connected with the rear end of the drive rod to drive the drive rod to move back and forth, and the front end of the drive rod is hinged with the push rod 5.

[0055] The sofa frame will act in the following sequence: When the sofa frame is changing from a sitting position to a lying position, the first drive mechanism 1 is used to drive the second drive mechanism 2 to move forwards to drive the push rod 5 to move forwards relative to the seat frame 4, so that the foot rest assembly 6 changes from the contracted state to the extended state. At this time, the sofa frame is half lying, and then the first drive mechanism 1 is used to drive the second drive mechanism 2 to continue to move forwards to drive the seat frame 4 to move forward relative to the base 3 through the foot rest assembly 6, so that the backrest assembly 7 changes from the upright state to the inclined state. When the sofa frame is changing from a lying position to a sitting position, firstly, the second drive mechanism 2 is driven by the first drive mechanism 1 to move backward, and the base frame 4 moves backward relative to the base 3 through the foot rest assembly 6, so that the backrest assembly 7 can change from the inclined state to the upright state. At this time, the sofa frame is half lying, and then the second drive mechanism 2 is driven by the first drive mechanism 1 to continue moving backwards, thus driving the push rod 5 to move backwards relative to the seat frame 4, so that the foot rest assembly 6 can change from the extended state to the contracted state. It is worth mentioning that in this embodiment, since there is only one power source, that is, the first drive mechanism 1, and the second drive mechanism 2 is driven by the first drive mechanism 1 to move, the sofa frame can only move according to the above order. Compared with Embodiment 1, although the user has less freedom of choice, the cost is also lower.

[0056] Specifically, the module sliding block 13 is hinged with a rear end of the drive rod. During the movement of the drive rod, the drive rod rotates relative to the module sliding block 13 so as to cooperate with the forward and upward movement of the seat frame 4.

[0057] In this embodiment, there are two drive rods, which are arranged on the left and right oppositely. Wherein, the arrangement of two drive rods on the left and right can make more balanced transmission of force and more stable movement of the sofa frame. In other embodiments, the number of drive rods may be different.

[0058] In this embodiment, other structures of the sofa frame are the same as those in Embodiment 1, and will not be described here.

Embodiment 3

[0059] As shown in FIGS. 79, the difference between this embodiment and Embodiment 2 is that the sofa frame further comprises a damping element 8, and the base 3 and the seat frame 4 are connected with the damping element 8 to provide a backward force to the seat frame 4. When the sofa frame is changing from a sitting position to a lying position, and the push rod 5 moves forward relative to the seat frame 4, since the damping element 8 provides a backward force to the seat frame 4, the seat frame 4 can remain stationary until the foot rest assembly 6 is in the extended state. At this time, the first drive mechanism 1 drives the second drive mechanism 2 to continue to move forward against the acting force of the damping element 8, so as to drive the seat frame 4 to move forward relative to the base 3; when the sofa frame is changing from a lying position to a sitting position, since the damping element 8 provides a backward force to the seat frame 4, the seat frame 4 is first driven to move backward relative to the base 3, and then the push rod 5 is driven to move backward relative to the seat frame 4. It can be seen that the damping element 8 provides a backward force to the seat frame 4, so that the sofa frame will act in sequence conforming to human body movement habit.

[0060] In this embodiment, there are two damping elements 8, which are arranged oppositely on the left and right. Wherein, the arrangement of two damping elements 8 oppositely on the left and right can provide more balanced force and more stable movement of the sofa frame. In other embodiments, the number of damping elements 8 may be different.

[0061] In this embodiment, the damping element 8 is a tension spring. The base 3 and the seat frame 4 are fixedly connected with both ends of the tension spring respectively, and the tension spring provides backward force to the seat frame 4. When the seat frame 4 moves forward relative to the base 3, the tension spring is stretched, thereby producing an elastic restoring force. In other embodiments, the damping element 8 may be any other elastic component, such as an elastic band and a spring. When the damping element 8 is a spring, two ends of the spring press forward against the base 3 and backward against the seat frame 4 respectively.

[0062] As shown in FIG. 8, in this embodiment, the foot rest assembly 6 comprises: a first supporting rod 61, a second supporting rod 62, a third supporting rod 63, a fourth supporting rod 64, a fifth supporting rod 65, a sixth supporting rod 66 and a seventh supporting rod 67. The starting ends of the first supporting rod 61 and the fifth supporting rod 65 are hinged with the seat frame 4, and the starting end of the second supporting rod 62 is hinged with the driven end of the first supporting rod 61; the starting end of the third supporting rod 63 is hinged with the driven end of the second supporting rod 62, the starting end of the fourth supporting rod 64 is hinged with the driven end of the third supporting rod 63, the starting end of the sixth supporting rod 66 is hinged with the driven end of the fifth supporting rod 65, the starting end of the seventh supporting rod 67 is hinged with the driven end of the sixth supporting rod 66, and the middle part of the second supporting rod 62 is hinged with the middle part of the fifth supporting rod 65, the middle part of the third supporting rod 63 is hinged to a middle part of the sixth supporting rod 66, and the driven end of the fourth supporting rod 64 is hinged to the middle part of the seventh supporting rod 67. When the foot rest assembly 6 changes from the extended state to the contracted state, the first supporting rod 61, the second supporting rod 62, the third supporting rod 63, the fourth supporting rod 64, the fifth supporting rod 65, the sixth supporting rod 66 and the seventh supporting rod 67 are folded backwards; when the foot rest assembly 6 changes from the contracted state to the extended state, the first supporting rod 61, the second supporting rod 62, the third supporting rod 63, the fourth supporting rod 64, the fifth supporting rod 65, the sixth supporting rod 66 and the seventh supporting rod 67 are deployed forward. In this embodiment, the seventh supporting rod 67 is used to replace the fourth supporting rod 64 and the seventh supporting rod 67 in Embodiment 1, so that the overall length of the foot rest assembly 6 when it is in the extended state is shortened, and the structure is simplified, which can be applied to a shorter sofa foot rest.

[0063] Specifically, the third supporting rod 63 and the seventh supporting rod 67 are both provided with support plates, and when the foot rest assembly 6 is in the extended state, the support plates of the third supporting rod 63 and the seventh supporting rod 67 are flush with each other. Wherein, the support plates of the third supporting rod 63 and the seventh supporting rod 67 are both used for supporting the sofa foot rest.

[0064] In this embodiment, other structures of the sofa frame are the same as those in Embodiment 2, and will not be described here.