A seat frame

Abstract

The present invention provides a chair frame, characterized in that it includes: a base, which includes a transverse support rod and a longitudinal support rod; a lifting unit, which includes a support, a first lifting rod, a second lifting rod and a connecting piece; an extension unit, which includes a base plate, a lifting unit, a foot adjustment unit and a backrest adjustment unit, wherein the base plate is fixed to the connecting piece; and a power unit, which is arranged on the base and is respectively connected to the lifting unit and the extension unit, the power unit includes a driving unit, a connecting seat and a driving connecting rod, one end of the driving unit is hinged to the base, and the other end of the driving unit is hinged to the connecting seat; the lifting unit includes a first lifting link, a second lifting link, a third lifting link, a fourth lifting link and a seat surface mounting portion; the first lifting link and the second lifting link are provided with a first rotating fulcrum.

Description

Technical Field

[0001] The invention relates to a seat frame, in particular to a seat frame suitable for an elderly chair. Background Art

[0002] Chairs are commonly used in daily life. Seats usually include backrests, armrests, etc. With the improvement of living standards and the demand for seats by special groups, especially the elderly, special chairs for the elderly have emerged. The elderly chair has an adjustment function, which allows it to be adjusted between multiple usage states.

[0003] The application publication number is CN 112089241 A. A Chinese invention application with the application publication date of December 18, 2020 discloses a seat frame and a seat driven by dual motors, comprising a base frame (1), a lifting assembly (2), a driving assembly (3) and a telescopic link assembly (4); the telescopic link assembly (4) is connected to a foot connection member (5) and a backrest connection member (6); the driving assembly (3) is used to drive the telescopic link assembly (4) under the drive of a first driving motor to change the telescopic state of the foot connection member (5) and drive the lifting and lowering of the lifting assembly (2); and is used to drive the backrest connection member (6) to adjust the angle under the drive of a second motor; the driving assembly (3) comprises a first driving rod (31), and the first driving rod (31) is provided with a first driving connection member (32); the lifting assembly (2) comprises a lifting connection plate (21), and the lifting connection plate (21) is respectively connected to the driving assembly (3) and the telescopic link assembly (4), and the base frame (1) is provided with A second driving connecting member (11), the first driving connecting member (32) and the second driving connecting member (11) are used to connect a first driving motor; the telescopic connecting rod assembly (4) comprises a foot connecting rod assembly (41), a back connecting rod assembly (42) and an intermediate connecting rod assembly (43), the back connecting rod assembly (42) comprises a first back connecting rod assembly (421) and a second back connecting rod assembly (422), the first back connecting rod assembly (421) is connected to the foot connecting rod assembly (41) through the intermediate connecting rod assembly (43), the second back connecting rod assembly (422) is connected to a third driving rod (423), the lifting connecting plate (21) is also connected to a fourth driving rod (424), the third driving rod (423) is provided with a third driving connecting member (425), the fourth driving rod (424) is provided with a fourth driving connecting member (426), the third driving connecting member (425) and the fourth driving connecting member (426) are used to connect a second driving motor. In this invention application, the state of the seat frame is adjusted by driving the first drive motor and the second drive motor, and its structure is relatively complex and the cost is relatively high. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a seat frame with a reasonable structural design.

[0005] The technical solution adopted by the embodiment of the present invention to solve the above problem is: a seat frame, characterized in that it includes:

[0006] A base, comprising a transverse support rod and a longitudinal support rod, wherein the transverse support rod is extended along a first direction, the longitudinal support rod is extended along a second direction, and the transverse support rod is connected to the longitudinal support rod;

[0007] A lifting unit, comprising a support, a first lifting rod, a second lifting rod and a connecting piece, wherein one end of the first lifting rod is hinged to the support, and the other end thereof is hinged to the connecting piece; one end of the second lifting rod is hinged to the support, and the other end thereof is hinged to the connecting piece, wherein the hinge points of the first lifting rod and the second lifting rod at the support are at different positions, and the hinge points of the first lifting rod and the second lifting rod at the connecting piece are at different positions;

[0008] an extension unit, comprising a base plate, a lifting unit, a foot adjustment unit and a backrest adjustment unit, wherein the base plate is fixed to the connecting piece; and

[0009] A power unit, which is arranged on the base and connected to the lifting unit and the extension unit respectively, the power unit comprises a driving unit, a connecting seat and a driving connecting rod, one end of the driving unit is hinged to the base, and the other end of the driving unit is hinged to the connecting seat;

[0010] The lifting unit includes a first lifting link, a second lifting link, a third lifting link, a fourth lifting link and a seat surface mounting portion, wherein the first end of the first lifting link is hinged to the base plate, and the second end thereof is hinged to the first end of the third lifting link, the second end of the third lifting link is hinged to the first end of the seat surface mounting portion, the second end of the seat surface mounting portion is hinged to the first end of the fourth lifting link, the second end of the fourth lifting link is hinged to the first end of the second lifting link, and the second end of the second lifting link is connected to the base plate; the first lifting link and the second lifting link are provided with a first rotating fulcrum, and the first rotating fulcrum is located in the middle area of ​​the first lifting link and / or the second lifting link.

[0011] In the embodiment of the present invention, a slide groove is disposed on the second end of the second lifting link, and a corresponding hinge shaft is disposed on the base plate, and the hinge shaft is disposed in the slide groove.

[0012] The seat surface mounting portion of the embodiment of the present invention is provided with a mounting component which is a separate structure from the seat surface mounting portion, and the mounting component includes a first sheet portion and a second sheet portion, wherein the first sheet portion is mounted to the seat surface mounting portion, and the second sheet portion is provided with a plurality of mounting holes.

[0013] The foot adjustment unit described in the embodiment of the present invention includes a first foot adjustment rod, a second foot adjustment rod, a third foot adjustment rod, a fourth foot adjustment rod and a foot mounting portion, wherein the first end of the first foot adjustment rod is hinged to the first end of the third lifting link, the second end of the first foot adjustment rod is hinged to the first end of the second foot adjustment rod, the second end of the second foot adjustment rod is hinged to the foot mounting portion, the first end of the third foot adjustment rod is hinged to the first end of the seat surface mounting portion, the second end of the third foot adjustment rod is hinged to the first end of the fourth foot adjustment rod, and the second end of the fourth foot adjustment rod is hinged to the foot mounting portion.

[0014] In the embodiment of the present invention, the second foot adjustment rod and the third foot adjustment rod are provided with a second rotation fulcrum, and the second rotation fulcrum is located in the middle area of ​​the second foot adjustment rod and / or the third foot adjustment rod.

[0015] The foot adjustment unit of the embodiment of the present invention further includes a fifth foot adjustment rod, one end of which is hinged to the first end of the third lifting link, and the other end of which is hinged to the middle area of ​​the third foot adjustment rod.

[0016] The backrest adjustment unit described in the embodiment of the present invention includes a backrest adjustment rod and a backrest mounting portion, wherein the first end of the backrest adjustment rod is hinged to the base plate, and the second end of the backrest adjustment rod is hinged to the backrest mounting portion, and the backrest mounting portion is hinged to the second end of the seat surface mounting portion.

[0017] The backrest adjustment rod of the embodiment of the present invention comprises a main body, wherein the first end and the second end of the backrest adjustment rod are respectively located at two ends of the main body, and the main body is bent with the first end of the backrest adjustment rod and the second end of the backrest adjustment rod respectively.

[0018] The power unit described in the embodiment of the present invention also includes a first driving rod and a second driving rod, one end of the first driving rod is hinged to the driving connecting rod, and the other end of the first driving rod is hinged to the second driving rod, and the other end of the second driving rod is hinged to the seat surface mounting part relative to the first driving rod.

[0019] A first anti-dumping portion and a second anti-dumping portion are provided on the base in the embodiment of the present invention, and one end or both ends of the transverse support rod extend beyond the longitudinal support rod to form the first anti-dumping portion; the second anti-dumping portion is protruding from the base in the second direction, and the second anti-dumping portion is "U"-shaped, and the ratio of the width dimension of the second anti-dumping portion in the second direction to the width dimension of the support frame of the base is 1:3.5~4.5.

[0020] In the embodiment of the present invention, the first lifting link has a first bent portion to have an accommodation space in the width direction of the seat frame, and a part or all of the third lifting link is located in the accommodation space in the width direction of the seat frame.

[0021] The foot adjustment unit of the embodiment of the present invention further includes a fifth foot adjustment rod, one end of which is hinged to the middle area of ​​the first foot adjustment rod, and the other end of which is hinged to the middle area of ​​the third foot adjustment rod.

[0022] Compared with the prior art, the present invention has one or more of the following advantages or effects: simple structure and reasonable design; the seat frame can be adjusted to four states by only one power unit, and the cost is relatively low; the second anti-dumping part is "U"-shaped and fixed on one set of transverse support rods, and forms a closed structure with the transverse support rods, so that the structure of the second anti-dumping part is more stable and can withstand greater force; when the first lifting link and the second lifting link rotate relative to the first rotating fulcrum, the first end of the first lifting link and the first end of the second lifting link can be lifted. The relative position of the seat surface mounting portion can be lifted, thereby the seat surface mounting portion can be lifted. Compared with the multi-link lifting structure, the above structure is simpler in structure and has higher structural stability. A slide groove is arranged at the second end of the second lifting link, and a corresponding hinge shaft is arranged on the base plate, and the hinge shaft is arranged in the slide groove. Therefore, the second end of the second lifting link and the base plate can realize relative rotation and relative deflection, which is beneficial to the design of the motion structure. The structure of the backrest adjustment rod avoids force concentration when bearing weight, thereby improving the bearing capacity, and can also avoid the wooden frame cross bar arranged on the seat frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 these drawings without paying creative labor.

[0024] Figure 1It is a schematic diagram of the main structure of the seat frame in Example 1 of the present invention, showing that the seat frame is in a standing position.

[0025] Figure 2 The three-dimensional structure of the seat frame in the first embodiment of the present invention is shown in FIG. Figure 1 , showing the seat frame in a standing position.

[0026] Figure 3 The three-dimensional structure of the seat frame in the first embodiment of the present invention is shown in FIG. Figure 2 , showing the seat frame in a standing position.

[0027] Figure 4 yes Figure 3 A magnified schematic diagram of point B in the middle.

[0028] Figure 5 It is a schematic diagram of the main structure of the seat frame in Example 1 of the present invention, showing that the seat frame is in a sitting position.

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of the seat frame in Example 1 of the present invention, showing the seat frame in a sitting position.

[0030] Figure 7 It is a schematic diagram of the main structure of the seat frame in Example 1 of the present invention, showing that the seat frame is in a TV posture.

[0031] Figure 8 It is a schematic diagram of the three-dimensional structure of the seat frame in Example 1 of the present invention, showing that the seat frame is in a TV posture.

[0032] Fig. 9 It is a schematic diagram of the front structural view of the seat frame in Example 1 of the present invention, showing that the seat frame is in a lying state.

[0033] Fig.10 It is a schematic diagram of the three-dimensional structure of the seat frame in Example 1 of the present invention, showing that the seat frame is in a TV posture.

[0034] Fig.11 yes Fig.10 Enlarged view of point C in FIG.

[0035] Fig.12 This is a schematic diagram of the three-dimensional structure of the stretching unit. Figure 1 .

[0036] Fig.13 yes Fig.12 Enlarged view of point A in the middle.

[0037] Fig.14 This is a schematic diagram of the three-dimensional structure of the stretching unit. Figure 2 .

[0038] Fig.15 This is a schematic diagram of the three-dimensional structure of the stretching unit. Figure 3 .

[0039] Fig.16 It is a schematic diagram of the main structure of the seat frame in Example 2, showing that the seat frame is in a standing position.

[0040] Fig.17 It is a schematic diagram of the front structural view of the seat frame in Example 2, showing the seat frame in a sitting position.

[0041] Fig.18 It is a schematic diagram of the main structure of the seat frame in Example 2, showing that the seat frame is in a TV posture.

[0042] Fig.19 It is a schematic diagram of the front structural view of the seat frame in Example 2, showing that the seat frame is in a lying position. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0044] Example 1

[0045] See also Figures 1 to 15 The seat frame of this embodiment is suitable for an elderly chair and includes a base 1, a lifting unit 2, a stretching unit 3 and a power unit 4.

[0046] The base 1 in this embodiment includes a transverse support rod 11 and a longitudinal support rod 12, which are connected to form a support frame. Two groups of transverse support rods 11 are provided, and two groups of longitudinal support rods 12 are provided. The transverse support rods 11 extend along a first direction X, and the longitudinal support rods 12 extend along a second direction Y. The first direction X is perpendicular or substantially perpendicular to the second direction Y.

[0047] The longitudinal support rod 12 can be welded to the transverse support rod 11. The longitudinal support rod 12 can also be fixed to the transverse support rod 11 by bolts. In the first direction X, one or both ends of the transverse support rod 11 exceed the longitudinal support rod 12 to form a first anti-dumping portion 111. The lifting unit 2 in this embodiment is provided with two groups and is arranged on the base 1. Specifically, the two groups of lifting units 2 are respectively arranged on the two groups of longitudinal support rods 12. The distance between the two groups of longitudinal support rods 12 defines the distance between the two groups of lifting units 2, which ultimately determines the width of the seat surface of the seat, and the width of the seat is within a fixed range to a certain extent. Therefore, one or both ends of the transverse support rod 11 exceed the longitudinal support rod 12 to form the first anti-dumping portion 111, which can prevent the seat from tipping over in the first direction X and ensure the safety of the seat when in use, especially when used as an elderly chair.

[0048] A second anti-dumping portion 13 may also be provided on the base 1 in this embodiment, and the second anti-dumping portion 13 is protruded from the base 1 in the second direction Y. The second anti-dumping portion 13 is "U"-shaped, and is fixed to one group of transverse support rods 11, and forms a closed structure with the transverse support rods 11, so that the structure of the second anti-dumping portion 13 is more stable and can withstand greater force. The second anti-dumping portion 13 in this embodiment is located in the middle area of ​​the base 1 in the first direction X. The second anti-dumping portion 13 includes a tube portion, which is bent to form a "U" shape, and both ends of the tube portion are directly welded and fixed to the transverse support rods 11.

[0049] In this embodiment, the ratio of the width dimension a of the second anti-dumping portion 13 in the second direction Y to the width dimension b of the support frame of the base 1 is 1:3-6. Further, the ratio of the width dimension a of the second anti-dumping portion 13 in the second direction Y to the width dimension b of the support frame of the base 1 is 1:3.5-4.5. Thus, the anti-dumping performance in the second direction Y can be improved.

[0050] In this embodiment, the length dimension of the second anti-dumping portion 13 in the first direction x accounts for at least 50% of the length dimension of the supporting frame, thereby improving the anti-dumping performance in the first direction x.

[0051] In this embodiment, a plurality of support pads 14 are provided at the bottom of the base 1. Specifically, a support pad 14 is provided at both sides of the bottom of the transverse support rod 11 (or a support pad 14 is provided at the bottom of the first anti-dumping portion 121 of the transverse support rod 11), and a support pad 14 is provided at both sides of the bottom of the longitudinal support rod 12. Furthermore, a support pad 14 is provided at the bottom of the second anti-dumping portion 13 so that the second anti-dumping portion 13 can provide support when in use.

[0052] The lifting unit 2 in this embodiment includes a support 21, and the support 21 is fixed to the base 1. Specifically, the support 21 is fixed to the longitudinal support rod 12. The support 21 includes a sheet 211, a portion of which is attached to the inner side of the longitudinal support rod 12 relative to the base 1 and fixed. In some embodiments, the sheet 211 is fixed to the longitudinal support rod 12 by welding. In some embodiments, the sheet 211 is fixed to the longitudinal support rod 12 by bolts.

[0053] The support 21 is provided with a first limiting portion 212, and the first limiting portion 212 abuts against the top of the longitudinal support rod 12, thereby completing the positioning of the support 21 and the longitudinal support rod 12, and making it more convenient to perform subsequent fixation. In this embodiment, the first limiting portion 212 is formed by bending the side of the sheet 211, and the first limiting portion 212 is convexly arranged on the sheet 211 in the first direction X. The first limiting portion 212 has the advantages of simple structure and convenient processing.

[0054] The lifting unit 2 in this embodiment may further include a lifting part, which is connected to the support 21. Specifically, the lifting part (lifting unit 2) includes a first lifting rod 22, a second lifting rod 23 and a connecting piece 24, one end of the first lifting rod 22 is hinged to the support 21, and the other end thereof is hinged to the connecting piece 24; one end of the second lifting rod 23 is hinged to the support 21, and the other end thereof is hinged to the connecting piece 24. Among them, the first lifting rod 22 and the second lifting rod 23 have different hinge point positions at the support 21, and the first lifting rod 22 and the second lifting rod 23 have different hinge point positions at the connecting piece 24, so that the structural stability is better and the structural strength is higher. When the connecting piece 24 moves relative to the first lifting rod 22 and the second lifting rod 23, the movement mode is more controllable. The first lifting rod 22 and the second lifting rod 23 in this embodiment are both sheet-shaped and are extended along a plane.

[0055] The connecting piece 24 in this embodiment is a sheet-like structure and includes a first part 241 and a second part 242, wherein the first lifting rod 23 and the second lifting rod 24 are both hinged to the first part 241 of the connecting piece 24. The support 21 and the connecting piece 24 are arranged on the same side of the first lifting rod 22 and / or the second lifting rod 23. The vertical distance from the second part 242 to the first lifting rod 22 and / or the second lifting rod 23 is greater than the vertical distance from the first part 241 to the first lifting rod 22 and / or the second lifting rod 23. In other words, the second part 242 maintains a spacing with the first lifting rod 22 and / or the second lifting rod 23 in the thickness direction of the connecting piece 24, and the support 21 is arranged within the spacing in the thickness direction of the connecting piece 24. By setting the spacing, it is possible to prevent the support 21 from affecting the movement of the connecting piece 24 during movement.

[0056] The extension unit 3 in this embodiment includes a base plate 31, a lifting unit 32, a foot adjustment unit 33 and a backrest adjustment unit 34, wherein the base plate 31 is fixed to the connecting piece 24 (i.e., the extension unit 3 is fixed to the lifting unit 2 through the base plate 31). Two groups of extension units 3 are provided in this embodiment, and the two groups of extension units 3 are located on both sides of the seat frame in the first direction X.

[0057] The lifting unit 32 is connected to the base plate 31, and the lifting unit 32 includes a first lifting link 321, a second lifting link 322, a third lifting link 323, a fourth lifting link 324 and a seat surface mounting portion 325, wherein the first end 3211 of the first lifting link 321 is hinged to the base plate 31, and the second end 3212 thereof is hinged to the first end 3231 of the third lifting link 323, the second end 3232 of the third lifting link 323 is hinged to the first end 3251 of the seat surface mounting portion 325, the second end 3252 of the seat surface mounting portion 325 is hinged to the first end 3241 of the fourth lifting link 324, the second end 3242 of the fourth lifting link 324 is hinged to the first end 3221 of the second lifting link 322, and the second end 3222 of the second lifting link 322 is connected to the base plate 31. In this embodiment, the first lifting link 321 , the second lifting link 322 , the third lifting link 323 , the fourth lifting link 324 and the seat surface mounting portion 325 are all sheet-like structures.

[0058] Furthermore, the first lifting link 321 and the second lifting link 322 are provided with a first rotation fulcrum 301, and the first rotation fulcrum 301 is located in the middle area of ​​the first lifting link 321 and / or the second lifting link 322. When the first lifting link 321 and the second lifting link 322 rotate relative to the first rotation fulcrum 301, the relative positions of the first end 3211 of the first lifting link 321 and the first end 3221 of the second lifting link 322 can be raised, so that the seat surface mounting portion 325 can be raised. Compared with the lifting structure of multiple links, the above structure is simpler in structure and has higher structural stability.

[0059] Furthermore, a slide groove 3223 is provided at the second end 3222 of the second lifting link 322, and a corresponding hinge shaft 311 is provided on the base plate 31, and the hinge shaft 311 is provided in the slide groove 3223. Therefore, the second end 3222 of the second lifting link 322 and the base plate 31 can realize relative rotation and relative deflection, which is beneficial to the design of the motion structure.

[0060] In this embodiment, a second limiting portion 312 is disposed on the base plate 31 . The second limiting portion 312 is configured corresponding to the first lifting link 322 to limit the sinking limit of the first lifting link 322 .

[0061] In this embodiment, a third limiting portion 3253 is disposed on the seat surface mounting portion 325 , and the third limiting portion 3253 is configured correspondingly to the fourth lifting link 324 to limit the sinking limit of the seat surface mounting portion 325 .

[0062] In this embodiment, a mounting member 3254 may be further provided on the seat surface mounting portion 325 for mounting the seat surface. The mounting member 3254 may be directly welded and fixed to the seat surface mounting portion 325, or may be fixed to the seat surface mounting portion 325 by bolts. In general, the mounting member 3254 and the seat surface mounting portion 325 are split structures, and their mounting position and structural configuration are more flexible. The mounting member 3254 includes a first sheet portion 32541 and a second sheet portion 32542, wherein the first sheet portion 32541 is used to be mounted to the seat surface mounting portion 325 (mounted by bolts), and the second sheet portion 32542 plays a supporting and mounting role, and is provided with a plurality of mounting holes. The first sheet portion 32541 and the second sheet portion 32542 are integrally formed by bending.

[0063] The fourth lifting link 324 in this embodiment is in an "L" shape or a substantially "L" shape, so that its structural strength can be improved, thereby improving the supporting capacity. Similarly, the third lifting link 323 can also be in an "L" shape or a substantially "L" shape, so that its structural strength can be improved, thereby improving the supporting capacity.

[0064] The first lifting link 321 in this embodiment has a first bent portion 3213 to have an accommodation space in the width direction of the seat frame (in the first direction X), and a part or all of the third lifting link 323 is located in the accommodation space in the width direction of the seat frame. The first lifting link 321 in this embodiment has a second bent portion 3214, and the second bent portion 3214 forms the first end 3211 of the first lifting link 321, so that it can be more conveniently connected to the base plate 31.

[0065] The foot adjustment unit 33 in this embodiment is connected to the lifting unit 32, and includes a first foot adjustment rod 331, a second foot adjustment rod 332, a third foot adjustment rod 333, a fourth foot adjustment rod 334 and a foot mounting portion 335. The foot mounting portion 335 is configured to mount a foot support pedal. The first end 3311 of the first foot adjustment rod 331 is hinged to the first end 3231 of the third lifting link 323, the second end 3312 of the first foot adjustment rod 331 is hinged to the first end 3321 of the second foot adjustment rod 332, and the second end 3322 of the second foot adjustment rod 332 is hinged to the foot mounting portion 335. The first end 3331 of the third foot adjustment rod 333 is hinged to the first end 3251 of the seat surface mounting portion 325 , the second end 3332 of the third foot adjustment rod 333 is hinged to the first end 3341 of the fourth foot adjustment rod 334 , and the second end 3342 of the fourth foot adjustment rod 334 is hinged to the foot mounting portion 335 .

[0066] In this embodiment, the second foot adjustment rod 332 and the third foot adjustment rod 333 are provided with a second rotation fulcrum 3201, and the second rotation fulcrum 3201 is located in the middle area of ​​the second foot adjustment rod 332 and / or the third foot adjustment rod 333. The middle area in this embodiment refers to the area between the first end 3321 and the second end 3322 of the second foot adjustment rod 332 and / or the area between the first end 3331 and the second end 3332 of the third foot adjustment rod 333. The second foot adjustment rod 332 and the third foot adjustment rod 333 can rotate relative to each other through the second rotation fulcrum 3201, so that the foot adjustment unit 33 can be expanded or retracted to achieve adjustment, and the above structure is simple.

[0067] The foot adjustment unit 33 in this embodiment may further include a fifth foot adjustment rod 336, one end of which is hinged to the middle area of ​​the first foot adjustment rod 331 (the middle area here refers to the area between the first end 3311 and the second end 3312 of the first foot adjustment rod 331), and the other end of which is hinged to the middle area of ​​the third foot adjustment rod 333 (the middle area here refers to the area between the first end 3331 and the second end 3332 of the third foot adjustment rod 333). By setting the fifth foot adjustment rod 336, on the one hand, the first foot adjustment rod 331 and the third foot adjustment rod 333 can have mutual support through the fifth foot adjustment rod 336, and on the other hand, the stability of the structure is improved.

[0068] In this embodiment, a fourth position limiting portion 3333 is disposed on the third foot adjustment rod 333 , and the fourth position limiting portion 3333 is configured corresponding to the second foot adjustment rod 332 to limit the folding limit of the foot adjustment portion 33 .

[0069] The backrest adjustment unit 34 in this embodiment is connected to the lifting unit 32, and the backrest adjustment unit 34 is used to install the backrest. Specifically, the backrest adjustment unit 34 includes a backrest adjustment rod 341 and a backrest mounting portion 342, and the backrest mounting portion 342 is used to install the backrest. Among them, the first end 3411 of the backrest adjustment rod 341 is hinged to the base plate 31, and the second end 3412 of the backrest adjustment rod 341 is hinged to the backrest mounting portion 342. The backrest mounting portion 342 is hinged to the second end 3252 of the seat surface mounting portion 325. The movement of the seat surface mounting portion 325 can drive the backrest mounting portion 342 to rotate and adjust, and the setting of the backrest adjustment rod 341, on the one hand, plays a role in adjusting the backrest mounting portion 342, and on the other hand, provides support for the backrest mounting portion 342.

[0070] A turning portion 3253 is provided at the second end 3252 of the seat surface mounting portion 325 in this embodiment, and the turning portion 3253 forms an angle with the main part of the seat surface mounting portion 325 (the angle is approximately 70 degrees to 120 degrees), and the backrest mounting portion 342 is hinged at the turning portion 3253. When in use, the turning portion 3253 plays a certain supporting role, so the turning portion 3253 forms an angle with the main part of the seat surface mounting portion 325, which can improve its structural stability and strength, and improve the supporting capacity.

[0071] The backrest adjustment rod 341 in this embodiment is concave on the outer side of the seat frame in the second direction Y, so that the structural strength of the backrest adjustment rod 341 can be improved. In addition, the concave structure can also play a role of avoiding position (avoiding the wooden frame cross bar set on the seat frame) or positioning. The backrest adjustment rod 341 in this embodiment includes a main body 3413, and the first end 3411 and the second end 3412 of the backrest adjustment rod 341 are respectively located at the two ends of the main body 3413. There is an obtuse angle between the main body 3413 and the first end 3411, and there is an obtuse angle between the main body 3413 and the second end 3412. That is, the main body 3413 is bent with the first end 3411 and the second end 3412 respectively. The structure of the backrest adjustment rod 341 can avoid force concentration when bearing weight, thereby improving the load-bearing capacity.

[0072] The extension unit 3 in this embodiment is a separate component, which can realize the opening and closing of the foot adjustment unit 33, the angle adjustment of the backrest adjustment unit 34 and the lifting or lowering of the lifting unit 32, so as to realize the switching between sitting position, TV position and lying position. The structure is simpler and the structural stability is strong.

[0073] The power unit 4 in this embodiment is disposed on the base 1 and is connected to the lifting unit 2 and the extension unit 3 respectively, and can control the lifting and lowering of the lifting unit 2 and the movement of the extension unit 3 .

[0074] The specific power unit 4 includes a drive unit 41, a connecting seat 42 and a driving connecting rod 43. The drive unit 41 can be extended and retracted, and it can adopt a cylinder structure, an oil rod structure or a motor structure in the prior art to achieve the extension and retraction function. In this embodiment, the drive unit 41 is driven by a motor to achieve its extension and retraction, thereby adjusting the state of the seat frame. One end of the drive unit 41 is hinged to the base 1, and specifically, a first hinge seat 44 is fixed on one group of lateral support rods 11 of the base 1, and the first end of the drive unit 41 is hinged to the first hinge seat 44. The other end of the drive unit 41 is hinged to the connecting seat 42, and specifically, a second hinge seat 45 is fixed on the driving connecting rod 43, and the other end of the drive unit 41 is hinged to the second hinge seat 45.

[0075] One end of the driving connecting rod 43 in this embodiment is directly hinged to the connecting piece 24 , so that when the driving unit 41 is actuated, the connecting piece 24 can be raised or lowered by driving the connecting rod 43 .

[0076] The driving connecting rod 43 can be directly or indirectly connected to the seat surface mounting portion 325. In this embodiment, the driving connecting rod 43 is indirectly connected to the seat surface mounting portion 325. Specifically, the power unit 4 also includes a first driving rod 46 and a second driving rod 47, one end of the first driving rod 46 is hinged to the driving connecting rod 43, and the other end thereof is hinged to the second driving rod 47, and the second driving rod 47 is hinged to the seat surface mounting portion 325 relative to the other end of the first driving rod 46. When the driving unit 41 is in motion, the extension unit 3 can be moved by driving the seat surface mounting portion 325.

[0077] In this embodiment, the seat frame can be adjusted to four states by only one power unit, so the structure is simple and the cost is relatively low.

[0078] The seat frame in this embodiment has several states to provide different postures. Specifically, the seat frame has a sitting state (can be used as a normal seat), a TV posture state (the seat is laid down, suitable for watching TV), a lying state (the backrest is laid down further than the TV posture state, and can be in a lying position), and a standing state (raised compared to the sitting state, which can assist the user to stand up).

[0079] like Figure 1 As shown, the standing posture of the seat frame is shown, which assists the user (especially the elderly) to stand up. At this time, the lifting unit 2 is raised to the highest or highest position. The foot adjustment unit 33 is retracted relative to the lifting unit 32. The lifting unit 32 is relatively lowered. The angle of the backrest adjustment unit 34 relative to the seat surface mounting portion 325 is a1. The length dimension of the drive unit 41 is L1.

[0080] like Figure 5As shown, it shows the sitting state of the seat frame, at this time, the lifting unit 2 is lowered to a low position. The first lifting rod 22 of the lifting unit 2 is supported on the lateral support rod 11. The first lifting link 321 is supported on the second limit portion 312 of the base plate 31, and the foot adjustment unit 33 is retracted relative to the lifting unit 32. The lifting unit 32 is relatively lowered. The angle of the backrest adjustment unit 34 relative to the seat surface mounting portion 325 is a2 (a1 is equal to or approximately equal to a2). The length dimension of the drive unit 41 is L2 (L2 is less than L1).

[0081] like Figure 7 As shown, the TV posture state of the seat frame is shown, and the lifting unit 2 is lowered to a lower position. The first lifting rod 22 of the lifting unit 2 is supported by the lateral support rod 11. The foot adjustment unit 33 is unfolded relative to the lifting unit 32. The lifting unit 32 is relatively lowered. The angle of the backrest adjustment unit 34 relative to the seat surface mounting portion 325 is a3 (a3 is greater than a2, that is, the backrest adjustment unit 34 is unfolded to a greater extent in the TV posture state than in the sitting posture state). The length dimension of the drive unit 41 is L3 (L3 is less than L2).

[0082] like Fig. 9 As shown, the lying state of the seat frame is shown, and the lifting unit 2 is lowered to a lower position. The first lifting rod 22 of the lifting unit 2 is supported on the lateral support rod 11. The foot adjustment unit 33 is unfolded relative to the lifting unit 32. The lifting unit 32 is relatively lifted, and the foot adjustment unit 33 is lifted accordingly, which can produce a function similar to zero gravity. The angle of the backrest adjustment unit 34 relative to the seat surface mounting portion 325 is a4 (a4 is greater than a3, that is, the backrest adjustment unit 34 is unfolded to a greater extent in the lying state than in the TV state). The length dimension of the drive unit 41 is L4 (L4 is less than L1).

[0083] When the driving unit 41 is in the extended state, the seat frame is in the standing state, and when the driving unit 41 is gradually retracted, it switches to the sitting state, the TV state and the lying state in sequence. In addition, the lifting unit 2 is only raised when the standing state is switched, and remains stationary in other states.

[0084] Example 2

[0085] See also Figures 16 to 19 The seat frame of this embodiment is suitable for an elderly chair, and includes a base 1, a lifting unit 2, an extension unit 3 and a power unit 4. The basic structure of the seat frame in this embodiment is the same as the seat frame in Example 1. The difference is that one end of the fifth foot adjustment rod 336 of the foot adjustment unit 33 is hinged to the first end 3231 of the third lifting link 323, and the other end thereof is hinged to the middle area of ​​the third foot adjustment rod 333 (the middle area here refers to the area between the first end 3331 and the second end 3332 of the third foot adjustment rod 333).

[0086] Example 3

[0087] The elderly chair of this embodiment includes the seat frame of embodiment 1 or 2.

[0088] The above contents described in this specification are merely examples of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, as long as they do not deviate from the contents of the present specification or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A seat frame, characterized in that: include: A base, comprising a transverse support rod and a longitudinal support rod, wherein the transverse support rod is extended along a first direction, the longitudinal support rod is extended along a second direction, and the transverse support rod is connected to the longitudinal support rod; A lifting unit, comprising a support, a first lifting rod, a second lifting rod and a connecting piece, wherein one end of the first lifting rod is hinged to the support, and the other end thereof is hinged to the connecting piece; one end of the second lifting rod is hinged to the support, and the other end thereof is hinged to the connecting piece, wherein the hinge points of the first lifting rod and the second lifting rod at the support are at different positions, and the hinge points of the first lifting rod and the second lifting rod at the connecting piece are at different positions; an extension unit, comprising a base plate, a lifting unit, a foot adjustment unit and a backrest adjustment unit, wherein the base plate is fixed to the connecting piece; and A power unit, which is arranged on the base and connected to the lifting unit and the extension unit respectively, the power unit comprises a driving unit, a connecting seat and a driving connecting rod, one end of the driving unit is hinged to the base, and the other end of the driving unit is hinged to the connecting seat; The lifting unit includes a first lifting link, a second lifting link, a third lifting link, a fourth lifting link and a seat surface mounting portion, wherein the first end of the first lifting link is hinged to the base plate, and the second end thereof is hinged to the first end of the third lifting link, the second end of the third lifting link is hinged to the first end of the seat surface mounting portion, the second end of the seat surface mounting portion is hinged to the first end of the fourth lifting link, the second end of the fourth lifting link is hinged to the first end of the second lifting link, and the second end of the second lifting link is connected to the base plate; the first lifting link and the second lifting link are provided with a first rotating fulcrum, and the first rotating fulcrum is located in the middle area of ​​the first lifting link and / or the second lifting link.

2. The seat frame according to claim 1, characterized in that: A slide groove is arranged at the second end of the second lifting link, and a corresponding hinge shaft is arranged on the base plate, and the hinge shaft is arranged in the slide groove.

3. The seat frame according to claim 1, characterized in that: The foot adjustment unit includes a first foot adjustment rod, a second foot adjustment rod, a third foot adjustment rod, a fourth foot adjustment rod and a foot mounting portion, wherein the first end of the first foot adjustment rod is hinged to the first end of the third lifting link, the second end of the first foot adjustment rod is hinged to the first end of the second foot adjustment rod, the second end of the second foot adjustment rod is hinged to the foot mounting portion, the first end of the third foot adjustment rod is hinged to the first end of the seat surface mounting portion, the second end of the third foot adjustment rod is hinged to the first end of the fourth foot adjustment rod, and the second end of the fourth foot adjustment rod is hinged to the foot mounting portion.

4. The seat frame according to claim 3, characterized in that: The second foot adjustment rod and the third foot adjustment rod are provided with a second rotation fulcrum, and the second rotation fulcrum is located in the middle area of ​​the second foot adjustment rod and / or the third foot adjustment rod.

5. The seat frame according to claim 3 or 4, characterized in that: The foot adjustment unit further includes a fifth foot adjustment rod, one end of which is hinged to the first end of the third lifting link, and the other end of which is hinged to the middle area of ​​the third foot adjustment rod.

6. The seat frame according to claim 1, characterized in that: The backrest adjustment unit includes a backrest adjustment rod and a backrest mounting portion, wherein the first end of the backrest adjustment rod is hinged to the base plate, and the second end of the backrest adjustment rod is hinged to the backrest mounting portion, and the backrest mounting portion is hinged to the second end of the seat surface mounting portion.

7. The seat frame according to claim 6, characterized in that: The backrest adjustment rod comprises a main body, the first end and the second end of the backrest adjustment rod are respectively located at two ends of the main body, and the main body is bent with the first end of the backrest adjustment rod and the second end of the backrest adjustment rod respectively.

8. The seat frame according to claim 1, characterized in that: The power unit also includes a first driving rod and a second driving rod, one end of the first driving rod is hinged to the driving connecting rod, and the other end of the first driving rod is hinged to the second driving rod, and the other end of the second driving rod is hinged to the seat surface mounting portion relative to the first driving rod.

9. The seat frame according to claim 1, characterized in that: A first anti-dumping portion and a second anti-dumping portion are provided on the base, and one end or both ends of the transverse support rod extend beyond the longitudinal support rod to form the first anti-dumping portion; the second anti-dumping portion is protruding from the base in the second direction, and the second anti-dumping portion is "U"-shaped, and the ratio of the width dimension of the second anti-dumping portion in the second direction to the width dimension of the support frame of the base is 1:3.5~4.

5.

10. The seat frame according to claim 1, characterized in that: The first lifting link has a first bent portion to have an accommodation space in the width direction of the seat frame, and a part or all of the third lifting link is located in the accommodation space in the width direction of the seat frame.

11. The seat frame according to claim 1, characterized in that: The seat surface mounting portion is provided with a mounting component which is a separate structure from the seat surface mounting portion, and the mounting component includes a first sheet portion and a second sheet portion, wherein the first sheet portion is mounted to the seat surface mounting portion, and the second sheet portion is provided with a plurality of mounting holes.

12. The seat frame according to claim 3 or 4, characterized in that: The foot adjustment unit further includes a fifth foot adjustment rod, one end of which is hinged to the middle area of ​​the first foot adjustment rod, and the other end of which is hinged to the middle area of ​​the third foot adjustment rod.

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