Seat extension bracket, seat extension device and seat

Abstract

The present invention relates to the field of furniture, and discloses a seat extension bracket, a seat extension device, and a seat. The seat extension bracket provided by the present invention hinges the two ends of the front support plate of the seat frame to the seat frame member and the leg extension assembly respectively, and adds a seat frame lifting support member, so that the two ends of the seat frame lifting support member are respectively rotatably connected to the middle part of the front support plate of the seat frame and the seat frame fixing member, so that when the leg extension assembly is unfolded, the seat can be switched to a zero-gravity posture in cooperation with the seat frame lifting support member. The seat extension device provided by the present invention limits the angle a between the seat frame surface of the seat frame assembly and the backrest, and the angle b between the seat frame surface of the seat frame assembly and the horizontal plane when the backrest drive assembly is at the maximum stroke, so as to achieve a zero-gravity state, so that the legs of the user lying on the seat are not lower than the heart, and the discomfort of special users is alleviated.

Description

Technical Field

[0001] The invention relates to the field of furniture, and in particular to a seat extension bracket, a seat extension device and a seat. Background Art

[0002] In order to meet the diversified functions of modern sofas and realize multi-functional transformation, a multi-functional sofa seat has gradually been born. It can smoothly transform from sitting, leisure to lying position, meet various requirements such as sitting, leisure and sleeping, and has greater advantages than traditional sofas.

[0003] The multifunctional sofa seat is designed by combining ergonomics, planar rod kinematics and other methods to make the sofa more comfortable and beneficial to the body's blood circulation.

[0004] However, when the existing multifunctional sofa seats are in a lying position, the user's legs will be lower than the chest and heart. For some special groups such as those with low blood pressure and the elderly, maintaining a lying position for a long time will cause certain discomfort. Summary of the invention

[0005] The object of the present invention is to provide a seat extension bracket, a seat extension device and a seat, which can ensure that the user's legs are not lower than the heart when the seat is in a lying state, thereby alleviating the discomfort of special users.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A seat extension device having a zero-gravity posture, comprising a chassis, a seat extension bracket, a backrest and a backrest drive assembly, wherein the seat extension bracket comprises a leg extension assembly capable of extending or contracting relative to the chassis, and a seat frame assembly hinged to the leg extension assembly at a first hinge point and rotatably connected to the backrest; the backrest drive assembly can drive the backrest to rotate relative to the seat frame assembly;

[0008] When the seat extension device is in a zero-gravity posture, the backrest drive assembly is in a maximum stroke, and the angles between the seat frame surface of the seat frame assembly and the backrest and the horizontal plane are a and b respectively, 20°≤a≤30°, 120°≤b≤150°.

[0009] As a preferred technical solution of the above-mentioned seat extension device, the seat frame assembly includes a seat frame member, a seat frame front support plate, a seat frame lifting support member and a seat frame fixing member, and one end of the seat frame front support plate is hinged to the seat frame member at a second hinge point;

[0010] The rear end of the leg extension assembly is hinged to the front end of the seat frame at a first hinge point, and is also hinged to the other end of the seat frame front support plate. One end of the seat frame lifting support is hinged to the seat frame fixing member, and the other end is hinged to the middle of the seat frame front support plate.

[0011] The seat frame is provided with a leg opening limiter capable of abutting against the leg extension assembly, and the leg opening limiter, the first hinge point and the second hinge point are distributed from front to back along the seat frame.

[0012] As a preferred technical solution of the above-mentioned seat extension device, a first mounting column is provided on the seat frame fixing member for supporting and limiting the seat frame lifting support member.

[0013] As a preferred technical solution of the above-mentioned seat extension device, a second mounting column is provided on the seat frame member, and the second hinge point is located at the front end of the second mounting column;

[0014] The first mounting column and the second mounting column are connected by a first spring. When the seat frame lifting support member abuts against the first mounting column, the first spring is in a tensioned state.

[0015] As a preferred technical solution of the above-mentioned seat extension device, the seat frame assembly also includes:

[0016] A seat frame rear support rod, one end of which is hinged to the seat frame fixing member at a third hinge point, and the other end of which is hinged to the seat frame member at a fourth hinge point;

[0017] The seat frame lifting support member and the seat frame fixing member are hinged at the fifth hinge point, and the fifth hinge point is located at the front end of the third hinge point. The second hinge point, the second mounting column and the fourth hinge point are distributed from front to back along the seat frame member.

[0018] As a preferred technical solution of the above-mentioned seat stretching device, the seat frame assemblies are provided with two, and the leg stretching assemblies are provided in one-to-one correspondence with the seat frame assemblies;

[0019] The front ends of the two seat frame members are connected through a seat frame front support member, and the rear ends of the two seat frame members are respectively hinged to the two ends of the lower end of the backrest in the width direction;

[0020] One end of the backrest drive assembly is connected to the middle part of the seat frame front support member, and the other end is hinged to the lower end of the backrest. The hinge point between the seat frame and the backrest is located above the hinge point between the backrest drive assembly and the backrest.

[0021] As a preferred technical solution of the above-mentioned seat extension device, it also includes:

[0022] The chassis is rotatably connected to the middle part of the bottom support of the seat frame through a rotating shaft.

[0023] As a preferred technical solution of the above-mentioned seat stretching device, the seat stretching device also includes:

[0024] A seat frame bottom support member, the two ends of which are respectively connected to the rear ends of the two seat frame fixing members;

[0025] A seat frame driving front support member, one end of which is simultaneously connected to the seat frame front support plate and the seat frame fixing member rotatably connected to one of the seat frame assemblies, and the other end of which is rotatably connected to the seat frame front support plate and the seat frame fixing member of another seat frame assembly;

[0026] A seat frame driving assembly, one end of which is rotatably connected to the seat frame driving front support, and the other end of which is rotatably connected to the seat frame bottom support, and the seat frame driving assembly is used to drive the seat frame driving front support and the seat frame bottom support to move closer to or away from each other.

[0027] As a preferred technical solution of the above-mentioned seat extension device, the seat extension device also includes:

[0028] a first seat frame driving member, one end of which is hinged to the middle portion of the seat frame front support plate;

[0029] A second seat frame driving member, one end of the second seat frame driving member is hinged to the seat frame fixing member, and the other end is hinged to the other end of the first seat frame driving member, and the fifth hinge point is located between the sixth hinge point and the third hinge point; two of the second seat frame driving members are connected through the seat frame driving front support member.

[0030] As a preferred technical solution of the above-mentioned seat extension device, it also includes:

[0031] An armrest is fixed on the outer side of each seat frame fixing member.

[0032] As a preferred technical solution of the above-mentioned seat extension device, a third mounting column is provided on the seat frame member, and the third mounting column is located between the first hinge point and the second hinge point;

[0033] The leg extension assembly is provided with a fourth mounting column, and the fourth mounting column and the third mounting column are connected via a second spring. When the leg extension assembly is separated from the leg opening limiter, the second spring is in a tensioned state.

[0034] Seat extension bracket, including:

[0035] A seat frame assembly, the seat frame assembly comprising a seat frame member, a seat frame front support plate, a seat frame lifting support member and a seat frame fixing member, one end of the seat frame front support plate being hinged to the seat frame member at a second hinge point;

[0036] A leg extension assembly, wherein the rear end of the leg extension assembly is hinged to the front end of the seat frame at a first hinge point and is hinged to the other end of the seat frame front support plate, one end of the seat frame lifting support member is hinged to the seat frame fixing member, and the other end is hinged to the middle of the seat frame front support plate;

[0037] The seat frame is provided with a leg opening limiter capable of abutting against the leg extension assembly, and the leg opening limiter, the first hinge point and the second hinge point are distributed from front to back along the seat frame.

[0038] As a preferred technical solution of the above-mentioned seat extension bracket, the seat frame fixing member is provided with a first mounting column for supporting and limiting the seat frame lifting support member;

[0039] The maximum spacing distance between the first hinge point and the leg extension assembly is L1, 500mm≤L1≤520mm.

[0040] As a preferred technical solution of the above-mentioned seat extension bracket, a second mounting column is provided on the seat frame member, and the second hinge point is located at the front end of the second mounting column;

[0041] The first mounting column and the second mounting column are connected by a first spring. When the seat frame lifting support member abuts against the first mounting column, the first spring is in a tensioned state.

[0042] As a preferred technical solution of the above-mentioned seat extension bracket, the seat frame assembly also includes:

[0043] A seat frame rear support rod, one end of which is hinged to the seat frame fixing member at a third hinge point, and the other end of which is hinged to the seat frame member at a fourth hinge point;

[0044] The seat frame lifting support member and the seat frame fixing member are hinged at the fifth hinge point, and the fifth hinge point is located at the front end of the third hinge point. The second hinge point, the second mounting column and the fourth hinge point are distributed from front to back along the seat frame member.

[0045] The present invention further provides a seat, comprising the seat extension bracket described in any one of the above schemes, or the seat extension device described in any one of the above schemes.

[0046] Beneficial effects of the present invention: The seat extension bracket provided by the present invention, on the basis of the existing seat extension device, hinges the two ends of the seat frame front support plate to the seat frame member and the leg extension assembly respectively, and adds a seat frame lifting support member, so that the two ends of the seat frame lifting support member are respectively rotatably connected to the middle part of the seat frame front support plate and the seat frame fixing member, so that when the leg extension assembly is unfolded, it cooperates with the seat frame lifting support member, and the multifunctional sofa seat can be switched to a zero-gravity posture.

[0047] The seat extension device provided by the present invention limits the angle a between the seat frame surface of the seat frame assembly and the backrest, and the angle b between the seat frame surface of the seat frame assembly and the horizontal plane when the backrest driving assembly is at the maximum stroke, so that 20°≤a≤30°, 120°≤b≤150°, thereby achieving a zero gravity state, so that the legs of a user lying on the seat are not lower than the heart, and the discomfort of special users is alleviated.

[0048] The seat provided by the present invention adopts the above-mentioned seat extension bracket or the above-mentioned seat extension device, and can achieve a zero-gravity posture without making major changes to the existing seat structure, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0050] Figure 1 is a side view of a seat extension device in a zero-gravity posture provided by the first embodiment of the present invention;

[0051] Figure 2 is a schematic structural diagram of a seat extension device in a zero-gravity posture provided by Embodiment 1 of the present invention;

[0052] Figure 3 is a side view of the seat extension device in a sitting position provided by the first embodiment of the present invention;

[0053] Figure 4 is a side view of a seat extension device in a TV posture provided by Embodiment 1 of the present invention;

[0054] Figure 5 is a side view of a seat extension device in a lying position provided by the first embodiment of the present invention;

[0055] Figure 6 The structure of the seat extension device provided in the first embodiment of the present invention is shown in FIG. Figure 1 ;

[0056] Figure 7 The structure of the seat extension device provided in the first embodiment of the present invention is shown in FIG. Figure 2 ;

[0057] Figures 8 to 10 is a side view of a seat extension bracket provided in Embodiment 1 of the present invention;

[0058] Fig.11 It is a side view of the seat extension bracket provided in the second embodiment of the present invention.

[0059] In the figure:

[0060] 10. Seat frame assembly; 1001. Seat frame member; 1002. Seat frame front support plate; 1003. Seat frame lifting support member; 1004. Seat frame rear support rod; 1005. Seat frame fixing member; 1006. First seat frame driving member; 1007. Second seat frame driving member; 1008. Mounting plate;

[0061] 11. Leg extension assembly; 1101. Small footrest; 1102. Footrest; 1103. First connecting rod; 1104. Second connecting rod; 1105. Third connecting rod; 1106. Fourth connecting rod; 1107. Fifth connecting rod; 1108. Sixth connecting rod;

[0062] 12. Front support of seat frame; 13. Rear support of seat frame; 14. Front support of backrest drive; 15. Bottom support of seat frame; 16. Front support of seat frame drive; 17. Drive assembly of seat frame; 18. Drive assembly of backrest;

[0063] 2. Backrest; 3. Rotating shaft; 4. Chassis;

[0064] 51. Leg opening limiter; 52. Third mounting column; 53. Fourth mounting column; 54. Second spring; 55. Second mounting column; 56. First mounting column; 57. First spring;

[0065] 601, the eleventh hinge point; 602, the twelfth hinge point; 603, the thirteenth hinge point; 604, the fourteenth hinge point; 605, the fifteenth hinge point; 606, the sixteenth hinge point; 607, the seventeenth hinge point; 608, the eighteenth hinge point; 609, the nineteenth hinge point; 610, the twentieth hinge point; 611, the first hinge point; 612, the eighth hinge point; 613, the second hinge point; 614, the seventh hinge point; 615, the fifth hinge point; 616, the third hinge point; 617, the fourth hinge point; 618, the sixth hinge point; 619, the tenth hinge point; 620, the ninth hinge point. DETAILED DESCRIPTION

[0066] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0067] Embodiment 1

[0068] like Figures 1 to 7 As shown, this embodiment provides a seat extension bracket and a seat extension device, and the seat extension device includes the above-mentioned seat extension bracket. The seat in this embodiment mainly refers to a multifunctional sofa seat, but is certainly not limited to a multifunctional sofa seat, and can also be other multifunctional seats.

[0069] The seat extension device has a sitting posture, a TV posture, a lying posture and a zero gravity posture, and can be switched between various postures. Specifically, the seat extension device includes a chassis 4, a seat extension bracket, a backrest 2 and a backrest drive assembly 18, wherein the seat extension assembly includes a leg extension assembly 11 that can be extended or retracted relative to the chassis 4, and a seat frame assembly 10 that is hinged to the leg extension assembly at a first hinge point and is rotatably connected to the backrest 2, and the backrest drive assembly 18 can drive the backrest 2 to rotate relative to the seat frame assembly 10.

[0070] The chassis 4 is connected to the seat frame assembly 10 through the rotating shaft 3. The chassis 4 mainly plays a supporting role. The rotation of the seat frame assembly 10 is realized through the rotating shaft 3, thereby realizing the rotation of the seat; the backrest 2 is driven to rotate relative to the seat frame assembly 10 by the extension or contraction of the leg extension assembly 11 and the backrest drive assembly 18 to adjust the angle between the seat frame surface of the seat frame assembly 10 and the horizontal plane and the angle between the seat frame surface of the seat frame assembly 10 and the backrest 2, thereby realizing the switching of the seat between the sitting position, TV position, lying position and zero gravity position.

[0071] It should be noted that the zero-gravity posture means that when the above-mentioned seat extension device is applied, after the seat extension device is adjusted to the zero-gravity posture, if the user lies on it, the user's legs will not be lower than the heart.

[0072] In this embodiment, the angle between the seat frame surface of the seat frame assembly 10 and the horizontal plane is recorded as a, 3°≤a≤30°; the angle between the seat frame surface of the seat frame assembly 10 and the backrest 2 is recorded as b, 90°≤b≤150°. When the backrest drive assembly 18 is at the maximum stroke, 20°≤a≤30°, 120°≤b≤150° is defined, so that the seat extension device has a zero-gravity posture, so that the legs of the user lying on the seat are not lower than the heart, and the discomfort of special users is alleviated.

[0073] like Figures 8 to 10 As shown, the seat frame assembly 10 includes a seat frame member 1001, a seat frame front support plate 1002, a seat frame lifting support member 1003 and a seat frame fixing member 1005; the leg extension assembly 11 includes a small footrest 1101, a footrest 1102, a first connecting rod 1103, a second connecting rod 1104, a third connecting rod 1105, a fourth connecting rod 1106, a fifth connecting rod 1107 and a sixth connecting rod 1108, wherein the small footrest 11 01 and one end of the second link 1104 are hinged at the eleventh hinge point 601, the small footrest 1101 and one end of the footrest 1102 are hinged at the twelfth hinge point 602, the middle of the second link 1104 and one end of the third link 1105 are hinged at the thirteenth hinge point 603, the middle of the third link 1105 and the middle of the footrest 1102 are hinged at the fourteenth hinge point 604, and the other end of the third link 1105 One end of the first link 1103 is hinged at the fifteenth hinge point 605, the other end of the second link 1104 is hinged to one end of the fourth link 1106 at the sixteenth hinge point 606, the middle part of the first link 1103 and the middle part of the fourth link 1106 are hinged at the seventeenth hinge point 607, the other end of the fourth link 1106 and one end of the sixth link 1108 are hinged at the eighteenth hinge point 608, the other end of the first link 1103 and one end of the fifth link 1107 are hinged at the nineteenth hinge point 609, the middle part of the sixth link 1108 and the middle part of the fifth link 1107 are hinged at the twentieth hinge point 610, the other end of the fifth link 1107 is hinged to the seat frame member 1001 at the first hinge point 611, and the other end of the sixth link 1108 is hinged to one end of the seat frame lifting support member 1003 at the eighth hinge point 612.

[0074] One end of the seat frame front support plate 1002 is hinged to the seat frame member 1001 at the second hinge point 613, one end of the seat frame lifting support member 1003 is hinged to the seat frame fixing member 1005 at the fifth hinge point 615, and the other end is hinged to the middle of the seat frame front support plate 1002 at the seventh hinge point 614. The leg opening limiter 51 capable of abutting against the leg extension assembly 11 is provided on the seat frame member 1001, and the leg opening limiter 51, the first hinge point 611 and the second hinge point 613 are distributed from front to back along the seat frame member 1001.

[0075] It should be noted that the upper surface of the seat frame assembly 10 refers to the upper surface of the seat frame member 1001 .

[0076] In this embodiment, two seat frame assemblies 10 are provided, and the leg extension assembly 11 corresponds to the seat frame assembly 10 one by one. The front ends of the two seat frame members 1001 are connected through the seat frame front support member 12, and the rear ends of the two seat frame members 1001 are respectively hinged to the two ends in the width direction of the lower end of the backrest 2; one end of the backrest drive assembly 18 is connected to the middle of the seat frame front support member 12, and the other end is hinged to the lower end of the backrest 2. The hinge point of the seat frame member 1001 and the backrest 2 is located above the hinge point of the backrest drive assembly 18 and the backrest 2. The backrest is rotated relative to the seat frame assembly 10 through the backrest drive assembly 18.

[0077] In order to guide and support the movement of the backrest driving assembly 18 , one of the seat frame members 1001 is connected to the backrest driving front support member 14 , and the middle portion of the backrest driving assembly 18 is fixedly connected to the backrest driving front support member 14 .

[0078] In order to improve the stability of the connection between the two seat frame assemblies 10, the seat extension device further includes a seat frame rear support member 13, and both ends of the seat frame rear support member 13 are respectively connected to the rear ends of the two seat frame members 1001.

[0079] The above-mentioned seat extension device also includes a seat frame bottom support member 15, a seat frame drive front support member 16 and a seat frame drive assembly 17, wherein the two ends of the seat frame bottom support member 15 are respectively connected to the rear ends of the two seat frame fixing members 1005, one end of the seat frame drive front support member 16 is rotatably connected to the seat frame front support plate 1002 and the seat frame fixing member 1005 of one seat frame assembly 10, and the other end is rotatably connected to the seat frame front support plate 1002 and the seat frame fixing member 1005 of another seat frame assembly 10; one end of the seat frame drive assembly 17 is rotatably connected to the seat frame drive front support member 16, and the other end is rotatably connected to the seat frame bottom support member 15, and the seat frame drive assembly 17 is used to drive the seat frame drive front support member 16 and the seat frame bottom support member 15 to move closer to or away from each other, so as to realize the extension or contraction of the leg extension assembly 11 relative to the chassis 4, and to realize the adjustment of the angle between the seat frame surface of the seat frame member 1001 and the horizontal plane.

[0080] It should be noted that, in the present embodiment, the chassis 4 is fixedly connected to the middle portion of the seat frame bottom support member 15 so as to connect the chassis 4 to the seat frame assembly 10 .

[0081] In order to rotatably connect the seat frame driving front support member 16 to the seat frame assembly 10, the above-mentioned seat extension device also includes a first seat frame driving member 1006 and a second seat frame driving member 1007, and the first seat frame driving member 1006 and the second seat frame driving member 1007 both correspond to the seat frame assembly 10 one by one, one end of the first seat frame driving member 1006 is hinged to the middle part of the seat frame front support plate 1002 at the ninth hinge point 620, one end of the second seat frame driving member 1007 is hinged to the seat frame fixing member 1005 at the sixth hinge point 618, and the other end is hinged to the other end of the first seat frame driving member 1006 at the tenth hinge point 619, and the fifth hinge point 615 is located between the sixth hinge point 618 and the third hinge point 616; the two second seat frame driving members 1007 are connected through the seat frame driving front support member 16.

[0082] It should be noted that the structures of the seat frame driving assembly 17 and the backrest driving assembly 18 are both electric structures in the prior art and will not be described in detail here.

[0083] Furthermore, the seat frame fixing member 1005 is provided with a first mounting column 56 for supporting and limiting the seat frame lifting support member 1003. The seat frame lifting support member 1003 is supported and limited by the first mounting column 56 to support the seat frame member 1001 and prevent the seat frame member 1001 from sinking.

[0084] The specific process of switching the seat extension device to the zero gravity posture is as follows:

[0085] The seat frame driving assembly 17 pushes the seat frame driving front support member 16, and the seat frame driving front support member 16 is connected to the first seat frame driving member 1006. The first seat frame driving member 1006 pushes the seat frame front support plate 1002 forward around the second seat frame driving member 1007 as a radius. The seat frame front support plate 1002 contacts the first mounting column 56, and the seat frame member 1001 is driven to rotate by the seat frame front support plate 1002 around the hinge axis connecting the seat frame front support plate 1002 and the seat frame lifting support member 1003, and at the same time drives the fifth connecting rod 1107 to move backward, so that the leg extension assembly 11 gradually extends until the fifth connecting rod 1107 contacts the leg opening limit member 51 to switch the seat to the leg opening state.

[0086] The first seat frame driving member 1006 continues to push the seat frame front support plate 1002 upward around the second seat frame driving member 1007 as a radius, and the seat frame front support plate 1002 drives the seat frame lifting support member 1003 to move upward, so that the seat frame front support plate 1002 is separated from the first mounting column 56, so as to switch the seat to a zero-gravity posture, so that the legs of the user lying on the seat are not lower than the heart, thereby alleviating the discomfort of special users.

[0087] In summary, by using the seat extension device provided in this embodiment, the two ends of the seat frame front support plate 1002 are respectively hinged to the seat frame part 1001 and the leg extension component 11, and a seat frame lifting support member 1003 is additionally provided, so that the two ends of the seat frame lifting support member 1003 are respectively rotatably connected to the middle part of the seat frame front support plate 1002 and the seat frame fixing member 1005, so that the leg extension component 11 cooperates with the seat frame lifting support member 1003 when unfolded, and the seat can be switched to a zero-gravity posture, so that the legs of the user lying on the seat are not lower than the heart, thereby alleviating the discomfort of special users.

[0088] Furthermore, a second mounting column 55 is provided on the seat frame 1001, and the second hinge point 613 is located between the first hinge point 611 and the second mounting column 55; the first mounting column 56 and the second mounting column 55 are connected by a first spring 57, and when the seat frame lifting support 1003 abuts against the first mounting column 56, the first spring 57 is in a tensioned state.

[0089] With the above arrangement, the first spring 57 is used to first expand the leg extension assembly 11 in the contracted state to switch the multifunctional seat to the leg opening state, and then the seat frame 1001 is controlled to be lifted to switch the multifunctional seat to the zero gravity posture. It should be noted that when the seat is in the sitting state, the first spring 57 is in a natural state, and after the leg extension assembly 11 is extended to switch the seat to the TV posture or the lying position, the first spring 57 is in a tensioned state; when the seat is in the zero gravity posture, the tensioning force of the first spring 57 is greater than the tensioning force of the first spring 57 when the seat is in the TV posture or the lying position.

[0090] It should be further explained that the first spring 57 can be eliminated, and the leg extension assembly 11 can be expanded and the seat frame 1001 can be lifted by relying on the gravity of the seat frame assembly 10 or an external force, and the leg extension assembly 11 can be contracted and the seat frame 1001 can be lowered by relying on an external force.

[0091] Furthermore, the seat frame assembly 10 also includes a seat frame rear support rod 1004, one end of which is hinged to the seat frame fixing member 1005 at the third hinge point 616, and the other end is hinged to the seat frame member 1001 at the fourth hinge point 617; the fifth hinge point 615 and the third hinge point 616 are distributed front and rear along the seat frame fixing member 1005, and the second mounting column 55 is located between the second hinge point 613 and the fourth hinge point 617. The seat frame rear support rod 1004 improves the stability of the multifunctional seat during switching to the zero gravity posture.

[0092] Furthermore, if Figure 6As shown, the seat extension device further includes an armrest, and an armrest is fixed to the outer side of each seat frame fixing member 1005. The armrest can be directly fixed to the outer side of the seat frame fixing member 1005, or the armrest can be fixed to the mounting plate 1008, and then the mounting plate 1008 is fixedly mounted to the outer side of the seat frame fixing member 1005.

[0093] When the seat extension device is in a sitting state, the height between the seat frame surface of the seat frame assembly 10 and the lower surface of the chassis 4 is H1, H1>320mm; when the seat extension device is in a TV posture and a zero gravity posture, the interval distance between the first hinge point 611 and the small footrest 1101 is the largest, and the interval distance is recorded as L1, 500mm≤L1≤520mm.

[0094] The seat extension bracket provided in this embodiment is based on the existing seat extension device, in which the two ends of the seat frame front support plate are respectively hinged to the seat frame member and the leg extension assembly, and a seat frame lifting support member is additionally provided, so that the two ends of the seat frame lifting support member are respectively rotatably connected to the middle part of the seat frame front support plate and the seat frame fixing member, so that when the leg extension assembly is unfolded, it cooperates with the seat frame lifting support member, and the multifunctional sofa seat can be switched to a zero-gravity posture.

[0095] The seat extension device provided in this embodiment limits the angle a between the seat frame surface of the seat frame assembly and the backrest, and the angle b between the seat frame surface of the seat frame assembly and the horizontal plane when the backrest drive assembly is at the maximum stroke, so that 20°≤a≤30°, 120°≤b≤150°, thereby achieving a zero gravity state, so that the legs of a user lying on the seat are not lower than the heart, and the discomfort of special users is alleviated.

[0096] This embodiment also provides a seat, including the above-mentioned seat extension device, or the above-mentioned seat extension device, which can achieve a zero-gravity posture without making major changes to the existing seat structure and is low in cost.

[0097] Embodiment 2

[0098] The difference between this embodiment and the first embodiment is that the seat extension device is a structure with manual control action.

[0099] Specifically, Fig.11 As shown, the seat frame driving front support member 16, the seat frame driving assembly 17, the first seat frame driving member 1006 and the second seat frame driving member 1007 in the first embodiment are eliminated, and the backrest driving assembly 18 in the first embodiment is replaced by a gas spring.

[0100] The seat frame 1001 is provided with a third mounting post 52, which is located between the first hinge point 611 and the second hinge point 613. The leg extension assembly 11 is provided with a fourth mounting post 53, which is connected to the third mounting post 52 via a second spring 54. When the leg extension assembly 11 is separated from the leg opening limiter 51, the second spring 54 is in a tensioned state. When the seat is switched to a sitting position, the tension provided by the second spring 54 is used to keep the entire leg extension assembly 11 in a folded state.

[0101] Specifically, the first hinge point 611 , the second mounting column 55 , and the second hinge point 613 are distributed in sequence, and the fourth mounting column 53 is located between the twentieth hinge point 610 and the first hinge point 611 .

[0102] It should be noted that, for a manually controlled seat extension device, the armrest must be directly fixed to the outside of the seat frame fixing member 1005 .

[0103] The specific process of switching the seat extension device to the zero gravity posture is as follows:

[0104] The seat frame 1001 and the fifth connecting rod 1107 are pushed to move backward simultaneously by the reaction force of the armrest until the fifth connecting rod 1107 contacts the leg opening limiter 51, thereby completing the leg opening state.

[0105] Continue to push the armrest, the seat frame front support plate 1002 drives the seat frame lifting support member 1003 to move upward, so that the seat frame front support plate 1002 is separated from the first mounting column 56, so as to switch the seat extension device to a zero gravity posture.

[0106] When the seat extension device is in a zero-gravity posture, the first spring 57 is in a natural state.

[0107] It should be further explained that the fixed connection mentioned in the present invention is bolt connection or welding, and the rotating connection is hinged.

[0108] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

[0109] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0110] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A seat extension device, the seat extension device having a zero-gravity posture, comprising a chassis (4), a seat extension bracket, a backrest (2) and a backrest drive assembly (18), the seat extension bracket comprising a leg extension assembly (11) capable of extending or contracting relative to the chassis (4), and a seat frame assembly (10) hinged to the leg extension assembly (11) at a first hinge point (611) and rotatably connected to the backrest (2); the backrest drive assembly (18) is capable of driving the backrest (2) to rotate relative to the seat frame assembly (10); characterized in that: When the seat extension device is in a zero-gravity posture, the backrest drive assembly (18) is in a maximum stroke, and the angles between the seat frame surface of the seat frame assembly (10) and the backrest (2) and the horizontal plane are respectively a and b, 20°≤a≤30°, and 120°≤b≤150°; The seat frame assembly (10) comprises a seat frame member (1001), a seat frame front support plate (1002), a seat frame lifting support member (1003) and a seat frame fixing member (1005), wherein one end of the seat frame front support plate (1002) is hingedly connected to the seat frame member (1001) at a second hinge point (613); The rear end of the leg extension assembly (11) is hinged to the front end of the seat frame member (1001) at a first hinge point (611), and is also hinged to the other end of the seat frame front support plate (1002); one end of the seat frame lifting support member (1003) is hinged to the seat frame fixing member (1005), and the other end is hinged to the middle of the seat frame front support plate (1002); The seat frame (1001) is provided with a leg opening limiter (51) capable of abutting against the leg extension assembly (11), and the leg opening limiter (51), the first hinge point (611) and the second hinge point (613) are distributed from front to back along the seat frame (1001); The seat frame (1001) is provided with a second mounting column (55), and the second hinge point (613) is located at the front end of the second mounting column (55); The seat frame assembly (10) further comprises: A seat frame rear support rod (1004), one end of the seat frame rear support rod (1004) being hinged to the seat frame fixing member (1005) at a third hinge point (616), and the other end of the seat frame rear support rod (1004) being hinged to the seat frame member (1001) at a fourth hinge point (617); The seat frame lifting support member (1003) and the seat frame fixing member (1005) are hinged at a fifth hinge point (615), the fifth hinge point (615) is located at the front end of the third hinge point (616), and the second hinge point (613), the second mounting column (55) and the fourth hinge point (617) are distributed from front to back along the seat frame member (1001); The seat extension device further comprises: A first seat frame driving member (1006), one end of the first seat frame driving member (1006) being hinged to the middle portion of the seat frame front support plate (1002); a second seat frame driving member (1007), one end of the second seat frame driving member (1007) being hinged to the seat frame fixing member (1005) at a sixth hinge point (618), and the other end of the second seat frame driving member (1007) being hinged to the other end of the first seat frame driving member (1006), the fifth hinge point (615) being located between the sixth hinge point (618) and the third hinge point (616); The seat frame fixing member (1005) is provided with a first mounting column (56) for supporting and limiting the seat frame lifting support member (1003); It also includes: an armrest, and the armrest is fixed on the outer side of each seat frame fixing member (1005).

2. The seat extension device according to claim 1, characterized in that: The first mounting column (56) and the second mounting column (55) are connected via a first spring (57); when the seat frame lifting support member (1003) abuts against the first mounting column (56), the first spring (57) is in a tensioned state.

3. The seat extension device according to claim 1, characterized in that: The seat frame assemblies (10) are provided with two, and the leg extension assemblies (11) are arranged in one-to-one correspondence with the seat frame assemblies (10); The front ends of the two seat frame members (1001) are connected via a seat frame front support member (12), and the rear ends of the two seat frame members (1001) are respectively hinged to the two ends of the lower end of the backrest (2) in the width direction; One end of the backrest drive assembly (18) is connected to the middle part of the seat frame front support member (12), and the other end is hinged to the lower end of the backrest (2), and the hinge point between the seat frame member (1001) and the backrest (2) is located above the hinge point between the backrest drive assembly (18) and the backrest (2).

4. The seat extension device according to claim 3, characterized in that: The seat extension device also includes: A seat frame bottom support member (15), wherein two ends of the seat frame bottom support member (15) are respectively connected to the rear ends of the two seat frame fixing members (1005); A seat frame driving front support member (16), one end of the seat frame driving front support member (16) being rotationally connected to the seat frame front support plate (1002) and the seat frame fixing member (1005) of one seat frame assembly (10), and the other end of the seat frame driving front support member (16) being rotationally connected to the seat frame front support plate (1002) and the seat frame fixing member (1005) of another seat frame assembly (10); A seat frame driving component (17), one end of the seat frame driving component (17) is rotatably connected to the seat frame driving front support member (16), and the other end is rotatably connected to the seat frame bottom support member (15), and the seat frame driving component (17) is used to drive the seat frame driving front support member (16) and the seat frame bottom support member (15) to move closer to or farther from each other.

5. The seat extension device according to claim 4, characterized in that: The two second seat frame driving members (1007) are connected via the seat frame driving front support member (16).

6. The seat extension device according to claim 1, characterized in that: The seat frame member (1001) is provided with a third mounting column (52), and the third mounting column (52) is located between the first hinge point (611) and the second hinge point (613); The leg extension assembly (11) is provided with a fourth mounting column (53), the fourth mounting column (53) and the third mounting column (52) are connected via a second spring (54), and when the leg extension assembly (11) is separated from the leg opening limiter (51), the second spring (54) is in a tensioned state.

7. Seat extension bracket, characterized in that: include: A seat frame assembly (10), the seat frame assembly (10) comprising a seat frame member (1001), a seat frame front support plate (1002), a seat frame lifting support member (1003) and a seat frame fixing member (1005), one end of the seat frame front support plate (1002) being hinged to the seat frame member (1001) at a second hinge point (613); A leg extension component (11), wherein the rear end of the leg extension component (11) is hinged to the front end of the seat frame component (1001) at a first hinge point (611), and is also hinged to the other end of the seat frame front support plate (1002); one end of the seat frame lifting support component (1003) is hinged to the seat frame fixing component (1005), and the other end is hinged to the middle of the seat frame front support plate (1002); The seat frame (1001) is provided with a leg opening limiter (51) capable of abutting against the leg extension assembly (11), and the leg opening limiter (51), the first hinge point (611) and the second hinge point (613) are distributed from front to back along the seat frame (1001); The maximum spacing distance between the first hinge point (611) and the leg extension assembly (11) is L1, 500 mm ≤ L1 ≤ 520 mm; The seat frame (1001) is provided with a second mounting column (55), and the second hinge point (613) is located at the front end of the second mounting column (55); The seat frame assembly (10) further comprises: A seat frame rear support rod (1004), one end of the seat frame rear support rod (1004) being hinged to the seat frame fixing member (1005) at a third hinge point (616), and the other end of the seat frame rear support rod (1004) being hinged to the seat frame member (1001) at a fourth hinge point (617); The seat frame lifting support member (1003) and the seat frame fixing member (1005) are hinged at a fifth hinge point (615), the fifth hinge point (615) is located at the front end of the third hinge point (616), and the second hinge point (613), the second mounting column (55) and the fourth hinge point (617) are distributed from front to back along the seat frame member (1001); It also includes: an armrest, and the armrest is fixed to the outer side of each seat frame fixing member (1005).

8. The seat extension bracket according to claim 7, characterized in that: The seat frame fixing member (1005) is provided with a first mounting column (56) for supporting and limiting the seat frame lifting support member (1003).

9. The seat extension bracket according to claim 8, characterized in that: The first mounting column (56) and the second mounting column (55) are connected via a first spring (57); when the seat frame lifting support member (1003) abuts against the first mounting column (56), the first spring (57) is in a tensioned state.

10. A seat, characterized in that: It comprises the seat extension device according to any one of claims 1 to 6, or the seat extension bracket according to any one of claims 7 to 9.

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