Leg and back stretching device and leisure sofa

Abstract

The utility model provides a leg and back stretching device and a leisure sofa. The leg and back stretching device comprises a base frame; the pedal assembly and the backrest assembly are respectively connected with the base frame in an extensible or retractable manner; the linkage assembly is movably connected with the base frame, and the pedal assembly and the backrest assembly are respectively connected with at least part of the linkage assembly; the driving assembly comprises a driving part, a first driving part and a second driving part, the first driving part and the second driving part are connected with the driving part, the first driving part is connected with at least one part of the pedal assembly or the linkage assembly, the second driving part is connected with at least the other part of the backrest assembly or the linkage assembly, and the first driving part is connected with the driving end of the driving part; the driving component drives the pedal component to extend to the first preset position and then drives the backrest component to extend to the second preset position, so that the problems that in the prior art, a sofa with a leg and back extending device is complex and tedious in overall structure and high in production cost are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of functional furniture, in particular to a leg and back stretching device and a leisure sofa. Background Art

[0002] At present, a functional sofa refers to a sofa with a shape-changing and posture-adjustable function (the common postures of a sofa are two-position and three-position, two-position is sitting and lying, three-position is sitting, TV and lying). Its posture adjustment is mainly achieved by a mechanical extension device (also called an iron frame structure) inside the sofa, and market demand has promoted the improvement that the mechanical extension device can be installed on the frame or armrest of the sofa, and the sofa frame or armrest is in contact with the ground to support the entire sofa, such as a leisure sofa with changeable posture, a sofa with floor-standing armrests, etc.

[0003] However, the prior art has an armrest floor-standing iron frame structure including a footrest rod group, a lumbar support rod group, a transmission rod and a cushion bracket, and the matching connection relationship between the footrest rod group, the lumbar support rod group, the transmission rod and the cushion bracket makes it possible to switch back and forth between a sitting position, a TV position and a lying position to have functionality, but its seat portion includes multiple structural connections such as an armrest mounting plate and a suspension mechanism, and its structure is complex and cumbersome, requires a high level of production and processing, and has a high production cost. Utility Model Content

[0004] The main purpose of the utility model is to provide a leg and back stretching device and a leisure sofa, so as to solve the problems that the sofa with the leg and back stretching device in the prior art has a complicated overall structure and a high production cost.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a leg back stretching device is provided, comprising: a base frame; a footrest assembly and a backrest assembly, which are respectively connected to the base frame in an extendable or retractable manner; a linkage assembly, which is movably connected to the base frame, and the footrest assembly and the backrest assembly are respectively connected to at least a part of the linkage assembly; a driving assembly, comprising a driving component and a first driving member and a second driving member connected to the driving component, the first driving member being connected to at least a part of the footrest assembly or the linkage assembly, the second driving member being connected to at least another part of the backrest assembly or the linkage assembly, and the first driving member or the second driving member being connected to the driving end of the driving component, so that the driving component drives the footrest assembly to extend to a first preset position, and then drives the backrest assembly to extend to a second preset position.

[0006] Furthermore, the linkage assembly includes: a movable part, which is movably arranged, and the backrest assembly is connected to at least a part of the movable part; a linkage member, one end of the linkage member is connected to at least another part of the movable part, and the other end of the linkage member is connected to the foot pedal assembly, so that after the driving assembly drives the foot pedal assembly to move to the first preset position, the backrest assembly is driven to move to the second preset position through the movable part.

[0007] Furthermore, the movable parts include: a first movable part, a second movable part and a third movable part, which are hinged in sequence along the direction from the foot pedal assembly to the backrest assembly, the first movable part and the third movable part are respectively hinged to the base frame, and the backrest assembly is hinged to the third movable part; a fourth movable part, which is hinged to the base frame and located between the first movable part and the third movable part, the fourth movable part is connected to the second movable part in a limiting cooperation manner, one end of the linkage part is connected to the fourth movable part, and the other end of the linkage part is connected to the foot pedal assembly, so that the linkage part drives the fourth movable part to move when the foot pedal assembly is extended or contracted.

[0008] Furthermore, a first limiting member is provided on the fourth movable member, and a second limiting member coordinated and connected with the first limiting member is provided on the second movable member, and the second limiting member has a first limiting state and a second limiting state relative to the first limiting member, so that when the second limiting member is in the first limiting state, the first limiting member limits the movement of the second limiting member along the first direction, and when the second limiting member is in the second limiting state, the second limiting member limits the movement of the first limiting member along the second direction.

[0009] Furthermore, a limiting groove is arranged on the fourth movable member toward the pedal assembly, and the first limiting member includes a second limiting surface which is an inner side wall of the limiting groove and a first limiting surface connected to the groove edge of the limiting groove, so that when the second limiting member is in the first limiting state, the second limiting member contacts the first limiting surface and moves along its extension direction, and when the second limiting member is in the second limiting state, the second limiting member contacts the second limiting surface and moves along its extension direction.

[0010] Further, a third limiter is provided on the first movable member, and the third limiter is connected to the base frame in a limit-matching manner; and / or a fourth limiter is provided on the third movable member, and the fourth limiter is connected to the base frame in a limit-matching manner.

[0011] Furthermore, the pedal assembly includes: two groups of connecting rod members, which are arranged alternately, one group of connecting rod members includes a first connecting rod and a second connecting rod that are hinged to each other, and the other group of connecting rod members includes a third connecting rod and a fourth connecting rod that are hinged to each other, the middle part of the second connecting rod is hinged to the middle part of the third connecting rod, the first connecting rod and the third connecting rod are respectively hinged to the base frame, and the first driving member is selectively connected to one of the connecting rods in the two groups of connecting rod members; a first footrest member and a second footrest member, the second connecting rod and the fourth connecting rod are respectively hinged to the first footrest member at one end away from the base frame, and the second footrest member is respectively hinged to the second connecting rod and the fourth connecting rod.

[0012] Furthermore, the foot pedal assembly also includes: a fifth limit member, which can be optionally arranged on one of the connecting rods of the two groups of connecting rods, the first footrest, the second footrest and the base frame, so that when the foot pedal assembly is extended to the first preset position, the fifth limit member cooperates with a limit member close to it among the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod.

[0013] Furthermore, the backrest assembly includes: a backrest mounting member, which is hinged to the base frame and is used to connect to the backrest frame; a backrest connecting member, one end of which is hinged to the backrest mounting member, and the other end of the backrest connecting member is hinged to at least a portion of the linkage assembly, so that the driving assembly drives the backrest connecting member to drive the backrest mounting member to move to a second preset position through the linkage assembly.

[0014] According to another aspect of the utility model, a leisure sofa is provided, comprising the above-mentioned leg and back stretching device.

[0015] By applying the technical solution of the utility model, the leg back stretching device includes a base frame, a pedal assembly, a backrest assembly, a linkage assembly and a driving assembly; the pedal assembly and the backrest assembly are respectively connected to the base frame in an extendable or contractible manner; the linkage assembly is movably connected to the base frame, and the pedal assembly and the backrest assembly are respectively connected to at least a part of the linkage assembly; the driving assembly includes a driving component and a first driving component and a second driving component connected to the driving component, the first driving component is connected to at least a part of the pedal assembly or the linkage assembly, the second driving component is connected to at least another part of the backrest assembly or the linkage assembly, and the first driving component or the second driving component is connected to the driving end of the driving component, so that the driving component drives the pedal assembly to extend to the first preset position, and then drives the backrest assembly to extend to the second preset position. In the above arrangement, the first driving member and the second driving member are respectively connected to the driving member in opposite directions, so that the footrest assembly and the backrest assembly are respectively connected to the base frame through the linkage assembly, and driven by the first driving member and the second driving member, the footrest assembly and the backrest assembly are moved to the first preset position and the second preset position in sequence to realize the sequential conversion among the three postures of sitting, TV and lying. In addition, by improving the setting method of the overall structure, the structure of the overall iron frame is simplified without changing the functionality of the three-posture conversion, making its structure simpler and the production cost lower, but still having the functionality of the three-posture conversion, and relying on the reasonable setting of the single driving member, the production cost can also be saved during manufacturing, thereby solving the problem that the overall structure of the sofa with a leg and back extension device in the prior art is complicated and cumbersome, and the production cost is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of an embodiment of the leg back stretching device according to the utility model in a first viewing angle of a TV posture is shown;

[0018] Figure 2 A schematic structural diagram of an embodiment of the leg back stretching device according to the utility model in a sitting position is shown;

[0019] Figure 3 A schematic structural diagram of an embodiment of the leg back stretching device according to the utility model in a second viewing angle of a TV posture is shown;

[0020] Figure 4 The schematic diagram shows the structure of the embodiment of the leg back stretching device according to the utility model in a lying position.

[0021] The above drawings include the following reference numerals:

[0022] 10. Base frame;

[0023] 20. Footrest assembly; 21. First connecting rod; 22. Second connecting rod; 23. Third connecting rod; 24. Fourth connecting rod; 25. First footrest; 26. Second footrest; 27. Fifth stopper;

[0024] 30. Backrest assembly; 31. Backrest mounting piece; 32. Backrest connecting piece;

[0025] 40. linkage assembly; 41. movable part; 410. first movable part; 4101. third limiting part; 411. second movable part; 4110. second limiting part; 412. third movable part; 4120. fourth limiting part; 413. fourth movable part; 4130. first limiting part; 4131. limiting groove; 4132. second limiting surface; 4133. first limiting surface; 42. linkage part;

[0026] 50. Driving assembly; 51. Driving member; 52. First driving member; 53. Second driving member. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] In order to solve the problems in the prior art that the sofa with a leg and back stretching device has a complicated overall structure and a high production cost, the utility model provides a leg and back stretching device and a leisure sofa.

[0029] Please refer to Figures 1 to 4 As shown, one aspect of the technical solution of the utility model is applied, the leg back stretching device includes a base frame 10, a footrest assembly 20, a backrest assembly 30, a linkage assembly 40 and a driving assembly 50; the footrest assembly 20 and the backrest assembly 30 are respectively connected to the base frame 10 in an extendable or retractable manner; the linkage assembly 40 is movably connected to the base frame 10, and the footrest assembly 20 and the backrest assembly 30 are respectively connected to at least a part of the linkage assembly 40; the driving assembly 50 includes a driving component 51 and a first driving component 52 and a second driving component 53 connected to the driving component 51, the first driving component 52 is connected to at least a part of the footrest assembly 20 or the linkage assembly 40, the second driving component 53 is connected to at least another part of the backrest assembly 30 or the linkage assembly 40, and the first driving component 52 or the second driving component 53 is connected to the driving end of the driving component 51, so that the driving component 51 drives the footrest assembly 20 to extend to the first preset position, and then drives the backrest assembly 30 to extend to the second preset position.

[0030] By applying the technical solution of an embodiment of the utility model, the first driving member 52 and the second driving member 53 are respectively connected to the driving member 51 in opposite directions. At the same time, the footrest assembly 20 and the backrest assembly 30 are respectively connected to the base frame 10 through the linkage assembly 40, and driven by the first driving member 52 and the second driving member 53, the footrest assembly 20 and the backrest assembly 30 are moved to the first preset position and the second preset position in sequence to achieve the sequential conversion among the three postures of sitting, TV and lying. In addition, by improving the setting method of the overall structure, the structure of the overall iron frame is simplified without changing the functionality of the three-posture conversion, making its structure simpler and the production cost lower, but still having the functionality of the three-posture conversion, and relying on the reasonable setting of the single driving assembly 50, the production cost can also be saved during production, thereby solving the problem that the overall structure of the sofa with a leg and back stretching device in the prior art is complicated and cumbersome, and the production cost is high.

[0031] In this embodiment, the driving component 51 is a linear driver, and the first driving component 52 and the second driving component 53 are driving rods respectively and are hinged to two connection points on the driving component 51 respectively.

[0032] like Figures 1 to 3 As shown, the linkage assembly 40 includes a movable part 41 and a linkage member 42; the movable part 41 is movably arranged, and the backrest assembly 30 is connected to at least a part of the movable part 41; one end of the linkage member 42 is connected to at least another part of the movable part 41, and the other end of the linkage member 42 is connected to the footrest assembly 20, so that after the driving assembly 50 drives the footrest assembly 20 to move to the first preset position, the backrest assembly 30 is driven to move to the second preset position through the movable part 41. In the above arrangement, in one embodiment of the present application, the first driving member 52 is connected to the footrest assembly 20, and the second driving member 53 is connected to the movable part 41 of the linkage assembly 40, while in another embodiment of the present application, the first driving member 52 is connected to the linkage member 42 of the linkage assembly 40, and the second driving member 53 is connected to the movable part 41 of the linkage assembly 40. In this way, after the driving component 51 drives the first driving component 52 to move forward to drive the footrest assembly 20 to extend to the first preset position, at this time, the footrest assembly 20 is limited and reaches the limit state, and the iron frame of the leg back extension device switches from the sitting position to the TV position; and when the iron frame switches from the TV position to the lying position, driven by the driving component 51, the first driving component 52 of the footrest assembly 20 is extended to the limit state and is stationary relative to the base frame 10, and then the second driving component 53 connected to the driving component 51 relative to the first driving component 52 moves, so that the movable component 41 moves backward to drive the backrest assembly 30 to extend to the second preset position, so as to realize the flexible switching of the iron frame of the leg back extension device among the three positions of sitting position, TV position and lying position, and during the extension or contraction process, the overall structure runs smoothly.

[0033] Specifically, the movable member 41 includes a first movable member 410, a second movable member 411 and a third movable member 412, which are hinged in sequence along the direction from the footrest assembly 20 to the backrest assembly 30. The first movable member 410 and the third movable member 412 are respectively hinged to the base frame 10, and the backrest assembly 30 is hinged to the third movable member 412; the fourth movable member 413 is hinged to the base frame 10 and is located between the first movable member 410 and the third movable member 412, and the fourth movable member 413 is connected to the second movable member 411 in a limited position. One end of the linkage member 42 is connected to the fourth movable member 413, and the other end of the linkage member 42 is connected to the footrest assembly 20, so that the linkage member 42 drives the fourth movable member 413 to move when the footrest assembly 20 is extended or contracted. With the above arrangement, the base frame 10, the fourth movable member 413, the linkage member 42 and the footrest assembly 20 form a planar quadrilateral structure. In this way, when the iron frame switches from the sitting position to the TV position, the first driving member 52 drives the linkage member 42 or directly drives the footrest assembly 20 to stretch to the first preset position. At this time, the other end of the linkage member 42 drives the fourth movable member 413 to move, so that the fourth movable member 413 and the second movable member 411 move in a limited position to prevent the movable member 41 from driving the backrest assembly 30 to move when the footrest assembly 20 stretches. When the iron frame switches from the TV position to the lying position, the second driving member 53 drives the third movable member 412 to move, so that the second movable member 411 once again moves in a limited position to prevent the footrest assembly 20 that has been stretched to the first preset position from being retracted during the stretching process.

[0034] In order to achieve the limiting cooperation between the second movable member 411 and the fourth movable member 413, the fourth movable member 413 is provided with a first limiting member 4130, and the second movable member 411 is provided with a second limiting member 4110 that is matched and connected with the first limiting member 4130. The second limiting member 4110 has a first limiting state and a second limiting state relative to the first limiting member 4130, so that when the second limiting member 4110 is in the first limiting state, the first limiting member 4130 limits the movement of the second limiting member 4110 along the first direction, and when the second limiting member 4110 is in the second limiting state, the second limiting member 4110 limits the movement of the first limiting member 4130 along the second direction. In the above arrangement, the first direction is the backward direction, and the second direction is the circumferential direction of the second limiting member 4110. In this way, when the iron frame switches from the sitting position to the TV position and the footrest assembly 20 is extended and opened, the second limiter 4110 is in the first limiter state and cooperates with the first limiter 4130, so that the second limiter 4110 on the second movable member 411 moves along the circumferential direction of the fourth movable member 413, and restricts the second movable member 411 with the second limiter 4110 to move backward, so as to prevent the backrest assembly 30 from also extending during the extension process of the footrest assembly 20. When the iron frame switches from the TV position to the lying position and the backrest assembly 30 is extended and opened, the second limiter 4110 is in the second limiter state and cooperates with the first limiter 4130, so that the second limiter 4110 on the second movable member 411 moves backward, and restricts the fourth movable member 413 with the first limiter 4130 to rotate around the axis direction of the second limiter 4110, so as to prevent the footrest assembly 20 that has been extended to the first preset position during the extension process of the backrest assembly 30 from being retracted.

[0035] It should be noted that the rearward direction is the direction from the footrest assembly 20 to the backrest assembly 30 , and the forward direction is the direction from the backrest assembly 30 to the footrest assembly 20 .

[0036] In this embodiment, the second limiting member 4110 is a limiting column or a limiting wheel.

[0037] Specifically, a limiting groove 4131 is set on the fourth movable member 413 toward the pedal assembly 20, and the first limiting member 4130 includes a second limiting surface 4132 which is the inner wall of the limiting groove 4131 and a first limiting surface 4133 connected to the edge of the groove of the limiting groove 4131, so that when the second limiting member 4110 is in the first limiting state, the second limiting member 4110 contacts with the first limiting surface 4133 and moves along its extension direction, and when the second limiting member 4110 is in the second limiting state, the second limiting member 4110 contacts with the second limiting surface 4132 and moves along its extension direction. According to the above arrangement, when the iron frame is converted from a sitting position to a TV position, the driving component 51 drives the first driving component 52 to move forward, thereby driving the footrest assembly 20 to extend, and also driving the linkage component 42 to extend forward, so that the fourth movable component 413 rotates under the drive of the linkage component 42. At this time, the second limiting component 4110 on the second movable component 411 is slidably connected to the first limiting surface 4133. Since the first limiting surface 4133 limits the backward movement of the second limiting component 4110, the second limiting component 4110 can only move along the extension direction of the first limiting surface 4133, and the fourth movable component 413 cannot move backward, which limits the third movable component 412 from rotating. The third movable component 412 does not move to achieve the effect of not extending the backrest assembly 30. During this process, the first driving component 52 moves forward and the second driving component 53 is stationary.

[0038] When the iron frame is in the TV posture, the second limiting member 4110 has moved to the edge of the limiting groove 4131 and is located between the second limiting surface 4132 and the first limiting surface 4133 .

[0039] When the iron frame is converted from the TV posture to the lying posture, the second limiting member 4110 is slidably connected to the second limiting surface 4132 and moves toward the bottom of the limiting groove 4131 along the extension direction of the second limiting surface 4132, so that the second limiting member 4110 is limited by the second limiting surface 4132, and the fourth movable member 413 cannot continue to rotate clockwise around the axis of the second limiting member 4110 (see the attached manual). Figure 2 , 3 , 4 (clockwise direction as defined by the perspective of FIG. 4), and the fourth movable member 413 cannot continue to rotate, thereby restricting the footrest assembly 20 from continuing to extend, and also restricting the first driving member 52 from remaining stationary at this time, while the driving member 51 continues to extend, thereby being able to drive the second driving member 53 to move backward, and drive the third movable member 412 to move backward to realize the rearward extension of the backrest assembly 30.

[0040] In this embodiment, when the driving component 51 is retracted, the limiting function of the first limiting member 4130 and the second limiting member 4110 still exists, so that the iron frame of the leg back stretching device retracts the backrest assembly 30 first and then retracts the footrest assembly 20.

[0041] In this embodiment, the first movable member 410 is provided with a third stopper 4101, and the third stopper 4101 is connected to the base frame 10 in a stoppered manner. In this way, when the sitting posture is converted to the TV posture, the driving component 51 drives the linkage member 42 to drive the footrest assembly 20 or directly drives the footrest assembly 20 to perform an extension movement, and at the same time, the first movable member 410 also moves. When the footrest assembly 20 extends to the first preset position, the third stopper 4101 on the first movable member 410 abuts against the base frame 10 for position limiting. At this time, the footrest assembly 20 is extended to the limit state, and the third stopper 4101 also enhances the stability of the footrest assembly 20 in the extended state.

[0042] In this embodiment, a fourth limiting member 4120 is provided on the third movable member 412, and the fourth limiting member 4120 is connected to the base frame 10 in a limiting manner. In this way, when the backrest assembly 30 is extended from the TV posture to the lying posture, the third movable member 412 drives the backrest assembly 30 to extend, and when the backrest assembly 30 extends to the second preset position, the fourth limiting member 4120 on the third movable member 412 abuts against the base frame 10 for limiting. At this time, the backrest assembly 30 is in the extension limit state, and the fourth limiting member 4120 also enhances the stability of the backrest assembly 30 in the extended state.

[0043] like Figure 1 , Figure 3 and Figure 4 As shown, the footrest assembly 20 includes two groups of connecting rod members, a first footrest member 25 and a second footrest member 26; the two groups of connecting rod members are arranged alternately, one group of connecting rod members includes a first connecting rod 21 and a second connecting rod 22 which are hinged to each other, and the other group of connecting rod members includes a third connecting rod 23 and a fourth connecting rod 24 which are hinged to each other, the middle part of the second connecting rod 22 is hinged to the middle part of the third connecting rod 23, the first connecting rod 21 and the third connecting rod 23 are respectively hinged to the base frame 10, and the first driving member 52 can be selectively connected to one of the connecting rods in the two groups of connecting rod members; the second connecting rod 22 and the fourth connecting rod 24 are respectively hinged to the first footrest member 25 at one end away from the base frame 10, and the second footrest member 26 is respectively hinged to the middle part of the second connecting rod 22 and the middle part of the fourth connecting rod 24. In the above arrangement, the first connecting rod 21 and the second connecting rod 22 are arranged at a preset angle with the third connecting rod 23 and the fourth connecting rod 24, and the preset angle L1 satisfies: 30°≤L1≤120°, and the two groups of connecting rods together form two planar quadrilateral structures. In this way, after the driving force is applied to the pedal assembly 20 by the first driving member 52 through the driving component 51, when the pedal assembly 20 is extended or contracted, the first connecting rod 21 and the third connecting rod 23 are infinitely close to parallel with the second connecting rod 22 and the fourth connecting rod 24 respectively, and when the pedal assembly 20 moves to the extended state, the first footrest 25 and the second footrest 26 are also infinitely close to parallel, and the overall structure is stable and runs smoothly.

[0044] In this embodiment, the first footrest 25 and the second footrest 26 are respectively connected to the connecting rod in a detachable manner by bolts, self-tapping screws or other means.

[0045] It should be noted that, in this embodiment, the number of connecting rod groups is not limited thereto, and can be selected accordingly according to usage requirements and actual working conditions. Optionally, the connecting rod groups are one group, three groups, four groups, five groups, or more groups.

[0046] Specifically, the pedal assembly 20 further includes a fifth stopper 27, which can be selectively arranged on one of the connecting rods of the two groups of connecting rods, the first footrest 25, the second footrest 26 and the base frame 10, so that when the pedal assembly 20 is extended to the first preset position, the fifth stopper 27 cooperates with a stopper close to it among the first connecting rod 21, the second connecting rod 22, the third connecting rod 23 and the fourth connecting rod 24. In this way, when the pedal assembly 20 is extended to the first preset position and the first connecting rod 21 and the second connecting rod 22 are in an extreme state of 120° with the third connecting rod 23 and the fourth connecting rod 24, the fifth stopper 27 abuts against any one of the connecting rods to keep the pedal assembly 20 in an extreme extension state and enhance the overall stability of the pedal assembly 20.

[0047] Specifically, the backrest assembly 30 includes a backrest mounting member 31 and a backrest connecting member 32; the backrest mounting member 31 is hinged to the base frame 10, and the backrest mounting member 31 is used to connect to the backrest frame of the sofa; one end of the backrest connecting member 32 is hinged to the backrest mounting member 31, and the other end of the backrest connecting member 32 is hinged to at least part of the linkage assembly 40, so that the driving assembly 50 drives the backrest connecting member 32 to drive the backrest mounting member 31 to move to the second preset position through the linkage assembly 40. In this way, under the drive of the second driving member 53, the third movable member 412 rotates, thereby driving the backrest connecting member 32 to rotate, thereby driving the backrest mounting member 31 to extend to the second preset position, realizing the conversion of the lying position of the leg back extension device iron frame.

[0048] Another aspect of the technical solution of the utility model provides a leisure sofa, including the above-mentioned leg and back stretching device, and also includes a sofa frame. The base frame 10 of the leg and back stretching device is fixedly connected to the sofa frame. The sofa frame can be a wooden armrest set on the ground, or a base set on the ground (such as an office chair-style base), etc. It is only necessary that the sofa frame is fixed relative to the ground and has space for the drive mechanism to move.

[0049] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0050] The leg back stretching device includes a base frame, a footrest assembly, a backrest assembly, a linkage assembly and a driving assembly; the footrest assembly and the backrest assembly are respectively connected to the base frame in an extendable or retractable manner; the linkage assembly is movably connected to the base frame, and the footrest assembly and the backrest assembly are respectively connected to at least a part of the linkage assembly; the driving assembly includes a driving component and a first driving component and a second driving component connected to the driving component, the first driving component is connected to at least a part of the footrest assembly or the linkage assembly, the second driving component is connected to at least another part of the backrest assembly or the linkage assembly, and the first driving component or the second driving component is connected to the driving end of the driving component, so that the driving component drives the footrest assembly to extend to the first preset position, and then drives the backrest assembly to extend to the second preset position. In the above arrangement, the first driving member and the second driving member are respectively connected to the driving member in opposite directions, so that the footrest assembly and the backrest assembly are respectively connected to the base frame through the linkage assembly, and driven by the first driving member and the second driving member, the footrest assembly and the backrest assembly are moved to the first preset position and the second preset position in sequence to realize the sequential conversion among the three postures of sitting, TV and lying. In addition, by improving the setting method of the overall structure, the structure of the overall iron frame is simplified without changing the functionality of the three-posture conversion, making its structure simpler and the production cost lower, but still having the functionality of the three-posture conversion, and relying on the reasonable setting of the single driving member, the production cost can also be saved during manufacturing, thereby solving the problem that the overall structure of the sofa with a leg and back extension device in the prior art is complicated and cumbersome, and the production cost is high.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0053] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0055] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0056] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A leg back stretching device, characterized in that: include: Base frame (10); A footrest assembly (20) and a backrest assembly (30) are respectively connected to the base frame (10) in an extendable or retractable manner; A linkage assembly (40) is movably connected to the base frame (10), and the footrest assembly (20) and the backrest assembly (30) are respectively connected to at least a portion of the linkage assembly (40); The driving assembly (50) comprises a driving component (51) and a first driving component (52) and a second driving component (53) connected to the driving component (51), wherein the first driving component (52) is connected to at least a part of the footrest component (20) or the linkage component (40), and the second driving component (53) is connected to at least another part of the backrest component (30) or the linkage component (40), and the first driving component (52) or the second driving component (53) is connected to a driving end of the driving component (51), so that the driving component (51) drives the footrest component (20) to extend to a first preset position, and then drives the backrest component (30) to extend to a second preset position.

2. The back stretching device according to claim 1, characterized in that: The linkage assembly (40) comprises: A movable component (41) is movably arranged, and the backrest assembly (30) is connected to at least a portion of the movable component (41); A linkage member (42), one end of the linkage member (42) is connected to at least another part of the movable component (41), and the other end of the linkage member (42) is connected to the footrest assembly (20), so that after the driving assembly (50) drives the footrest assembly (20) to move to the first preset position, the movable component (41) drives the backrest assembly (30) to move to the second preset position.

3. The back stretching device according to claim 2, characterized in that: The movable part (41) comprises: The first movable member (410), the second movable member (411) and the third movable member (412) are hingedly connected in sequence along the direction from the footrest assembly (20) to the backrest assembly (30); the first movable member (410) and the third movable member (412) are hingedly connected to the base frame (10) respectively, and the backrest assembly (30) is hingedly connected to the third movable member (412); A fourth movable member (413) is hinged to the base frame (10) and is located between the first movable member (410) and the third movable member (412). The fourth movable member (413) is connected to the second movable member (411) in a limited position. One end of the linkage member (42) is connected to the fourth movable member (413), and the other end of the linkage member (42) is connected to the foot pedal assembly (20), so that the linkage member (42) drives the fourth movable member (413) to move when the foot pedal assembly (20) is extended or contracted.

4. The back leg stretching device according to claim 3, characterized in that: The fourth movable part (413) is provided with a first limiting part (4130), and the second movable part (411) is provided with a second limiting part (4110) which is cooperatively connected with the first limiting part (4130), and the second limiting part (4110) has a first limiting state and a second limiting state relative to the first limiting part (4130), so that when the second limiting part (4110) is in the first limiting state, the first limiting part (4130) limits the movement of the second limiting part (4110) along the first direction, and when the second limiting part (4110) is in the second limiting state, the second limiting part (4110) limits the movement of the first limiting part (4130) along the second direction.

5. The back stretching device according to claim 4, characterized in that: A limiting groove (4131) is provided on the fourth movable member (413) toward the pedal assembly (20), and the first limiting member (4130) includes a second limiting surface (4132) which is the inner side wall of the limiting groove (4131) and a first limiting surface (4133) connected to the edge of the groove of the limiting groove (4131), so that when the second limiting member (4110) is in the first limiting state, the second limiting member (4110) contacts with the first limiting surface (4133) and moves along its extension direction, and when the second limiting member (4110) is in the second limiting state, the second limiting member (4110) contacts with the second limiting surface (4132) and moves along its extension direction.

6. The back leg stretching device according to claim 3, characterized in that: The first movable member (410) is provided with a third limiting member (4101), and the third limiting member (4101) is connected to the base frame (10) in a limiting manner; and / or, The third movable member (412) is provided with a fourth position-limiting member (4120), and the fourth position-limiting member (4120) is connected to the base frame (10) in a position-limiting manner.

7. The back leg stretching device according to claim 1, characterized in that: The pedal assembly (20) comprises: Two groups of connecting rods are arranged alternately, one group of connecting rods comprises a first connecting rod (21) and a second connecting rod (22) which are hinged to each other, and the other group of connecting rods comprises a third connecting rod (23) and a fourth connecting rod (24) which are hinged to each other, the middle part of the second connecting rod (22) is hinged to the middle part of the third connecting rod (23), the first connecting rod (21) and the third connecting rod (23) are respectively hinged to the base frame (10), and the first driving member (52) can be selectively connected to one of the connecting rods in the two groups of connecting rods; A first footrest (25) and a second footrest (26), one end of the second connecting rod (22) and the fourth connecting rod (24) away from the base frame (10) are respectively hinged to the first footrest (25), and the second footrest (26) is respectively hinged to the second connecting rod (22) and the fourth connecting rod (24).

8. The back stretching device according to claim 7, characterized in that: The pedal assembly (20) further comprises: A fifth limiting member (27) is selectively arranged on one of the connecting rods of the two groups of connecting rod members, the first footrest member (25), the second footrest member (26) and the base frame (10), so that when the footrest assembly (20) is extended to the first preset position, the fifth limiting member (27) cooperates with a limiting member close to the first connecting rod (21), the second connecting rod (22), the third connecting rod (23) and the fourth connecting rod (24).

9. The back stretching device according to claim 1, characterized in that: The backrest assembly (30) comprises: A backrest mounting member (31) connected to the base frame (10), wherein the backrest mounting member (31) is used to be connected to the backrest frame; A backrest connecting member (32), one end of the backrest connecting member (32) is hinged to the backrest mounting member (31), and the other end of the backrest connecting member (32) is hinged to at least a portion of the linkage assembly (40), so that the driving assembly (50) drives the backrest connecting member (32) through the linkage assembly (40) to drive the backrest mounting member (31) to move to the second preset position.

10. A leisure sofa, characterized in that: A back leg stretching device comprising the device described in any one of claims 1 to 9.

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