Multi-link lumbar support device

Abstract

The application discloses a multi-connecting-rod waist rest device which comprises a waist rest body, two waist pieces, two transmission rods and a support frame, the two waist pieces are arranged on the left and right sides of the waist rest body respectively, and each waist piece is arranged to rotate forward and backward relative to the waist rest body, the waist rest body is arranged to move forward and backward relative to the support frame, the left and right sides of the support frame are provided with transverse support parts, each support part and the waist piece are connected through the transmission rod, the rear end of the transmission rod is hinged to the support part, and the front end of the transmission rod is hinged to the waist piece. The multi-connecting-rod waist rest device has the advantages that the waist rest body, the waist pieces, the transmission rods and the support frame are hinged to each other to form a multi-connecting-rod structure, when the waist pieces have a tendency to rotate inward, the transmission rods are pulled to rotate inward, so that the waist pieces can rotate inward by a larger angle, and the waist pieces have a wider angle adjusting range and a higher activity freedom.

Description

Technical Field

[0001] This utility model relates to the field of lumbar support technology, specifically to a multi-link lumbar support device. Background Technology

[0002] To alleviate lower back fatigue caused by prolonged sitting, existing chairs typically include a lumbar support on the backrest to support the user's lower back and maintain its health. Furthermore, to further enhance lumbar support, a lumbar-hugging support has emerged on the market. This type of lumbar support uses a lumbar support panel hinged to each side of the main body. The support frame connecting to the backrest has a U-shaped structure, with both sides of the support frame hinged to the rear of the lumbar support panels. When the lumbar support is supported by the user's lower back, it moves towards the support frame, causing the lumbar support panels on both sides to rotate inward and converge simultaneously. This allows the lumbar support panels to automatically clamp onto the user's lower back, achieving a comfortable lumbar-hugging support effect.

[0003] However, the aforementioned lumbar support has the following drawbacks: the lumbar support body alone drives the lumbar plate to rotate, and the range and amplitude of the lumbar plate's rotation are relatively small. For some users with a slender build, such as children, the lumbar plate may not be able to rotate to a position that fits the user's waist, affecting the lumbar support's lumbar support effect. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a multi-link lumbar support device, which forms a multi-link structure by hinges between the lumbar support body, lumbar plate, transmission rod and support frame. When the lumbar plate has a tendency to rotate inward, it will pull the transmission rod to rotate inward as well, so that the lumbar plate can rotate inward by a larger angle, that is, the lumbar plate has a wider angle adjustment range and a higher degree of freedom of movement.

[0005] The effect of this utility model is achieved as follows: This application provides a multi-link lumbar support device, including a lumbar support body, two symmetrical lumbar pieces, two transmission rods, and a support frame. The two lumbar pieces are respectively disposed on the left and right sides of the lumbar support body, and each lumbar piece is rotatably disposed relative to the lumbar support body. The lumbar support body is movable relative to the support frame. The support frame is provided with transverse support parts on the left and right sides. Each support part and the lumbar piece are connected by a transmission rod. The rear end of the transmission rod is hinged to the support part, and the front end of the transmission rod is hinged to the lumbar piece. When the lumbar support body is supported, the lumbar support body moves toward the support frame. The lumbar support body pulls the waist pieces on both sides backward and pulls them inward in sync. The transmission rods on both sides are driven by the waist pieces to rotate in sync in sync, which in turn causes the waist pieces to rotate inward to a greater angle.

[0006] Furthermore, connecting parts are provided on both the left and right sides of the lumbar support body, extending towards the rear of the lumbar piece and hinged to the rear end of the lumbar piece. This not only hides the connection structure between the lumbar support body and the lumbar piece at the rear, enhancing the aesthetics of the multi-link lumbar support device, but also allows the lumbar piece to rotate smoothly using the connecting parts as a fulcrum.

[0007] Furthermore, a guide structure is provided between the lumbar support body and the support frame. The guide structure includes a guide member and a movable member. The guide member is a hollow sleeve-shaped structure, and the hollow part of the guide member is configured with a guide groove. The movable member is slidably connected to the guide member through the guide groove. The movable member is located in one of the lumbar support body and the support frame, and the guide member is located in the other. The guide structure guides the lumbar support body and restricts its direction of movement, making the lumbar support device's lumbar support operation more stable and smooth.

[0008] Furthermore, a limiting structure is provided between the guide component and the movable component. The limiting structure includes a screw and a limiting groove. The guide component has a limiting groove formed on its side wall, extending in the front-to-back direction. The screw passes through the limiting groove and is screwed to the movable component. When the movable component moves back and forth, the screw moves back and forth along the limiting groove. The screw restricts the range of motion of the movable component, making the lumbar support device's lumbar support operation more stable and smooth.

[0009] Furthermore, the lumbar support body has a square frame structure, including a lower crossbeam arranged horizontally on the lower side, with movable parts located on the upper side of the lower crossbeam. This not only makes the movable parts less likely to be exposed in the lumbar support device, improving its aesthetics, but also makes the upper side of the lumbar support body more prone to elastic deformation, thereby providing users with stronger elastic support and further enhancing comfort.

[0010] Furthermore, an elastic element is also provided within the guide groove. The elastic force of the elastic element acts on the movable element, causing the movable element to always tend to move away from the guide element. This ensures that the lumbar support body also tends to move forward under the push of the movable element, meaning that the lumbar support body always remains in close contact with the user's waist, and provides comfortable elastic support for the user's waist with the help of the elastic force of the elastic element.

[0011] Furthermore, an elastic element is provided between the lumbar support and the lumbar support body, and / or an elastic element is provided between the lumbar support and the transmission rod. The elastic force of the elastic element acts on the lumbar support, causing the lumbar support on both sides to always have an outward tendency. This ensures that the lumbar support body also always has a forward tendency under the action of the lumbar support, and provides comfortable elastic support for the user's waist with the help of the elastic force of the elastic element.

[0012] Furthermore, an elastic element is provided between the transmission rod and the waist plate, and / or an elastic element is provided between the transmission rod and the support part. The elastic force of the elastic element acts on the transmission rod, so that the transmission rods on both sides always have an outward tendency. This ensures that the waist plate always has an outward tendency under the drive of the transmission rod, which in turn drives the lumbar support body to always have a forward tendency, and provides comfortable elastic support for the user's waist with the help of the elastic force of the elastic element.

[0013] Furthermore, the multi-link lumbar support device also includes a mounting base, which is configured to connect to the backrest, with a support frame slidingly connected to the front side of the mounting base. This allows the lumbar support body and lumbar support panels to be adjusted vertically to meet the needs of users of various body types, further enhancing the adjustability of the multi-link lumbar support device and making it more practical.

[0014] Furthermore, the front end of the mounting base is tilted from front to back and from low to high. As the support frame slides up and down, its depth in the horizontal direction also changes synchronously, making the position of the lumbar support body and the lumbar piece more in line with the human body's curved back curve, thus conforming to ergonomics.

[0015] The multi-link lumbar support device provided in this application forms a multi-link structure through the hinged connection of the lumbar support body, lumbar panels, transmission rod, and support frame. The lumbar panels on both sides synchronously converge inward as the lumbar support body moves backward. That is, when the user's waist leans against the lumbar support body, the lumbar panels on both sides automatically converge inward and clamp the user's waist, providing a comfortable lumbar support effect. Furthermore, the lumbar panels and the support are connected by the transmission rod. When the lumbar panels tend to rotate inward, they pull the transmission rod to rotate inward as well, allowing the lumbar panels to rotate at a greater angle. This means the lumbar panels have a wider angle adjustment range and a higher degree of freedom of movement, providing a comfortable lumbar support effect even for slender users. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A three-dimensional structural schematic diagram of the multi-link lumbar support device provided in the embodiments of this application; Figure 2 A top view of the lumbar support device when the lumbar support body is in a forward position, as provided in the embodiments of this application. Figure 3 A top view of the lumbar support device when the lumbar support body is in a rearward position, as provided in the embodiments of this application. Figure 4 This is a schematic diagram of the connection structure between the support frame and the mounting base provided in an embodiment of this application; Figure 5A schematic diagram of the connection structure between the lumbar support body, lumbar piece, transmission rod and support frame provided in the embodiments of this application; Figure 6 A cross-sectional structural diagram of the lumbar support device when the lumbar support body is in a forward position, as provided in the embodiments of this application; Figure 7 This is a cross-sectional structural diagram of the lumbar support device when the lumbar support body is in a rearward position, as provided in the embodiments of this application.

[0017] The reference numerals in the attached drawings are as follows: 1-lumbar support body, 110-connecting part, 120-moving part, 121-connecting groove, 130-lower crossbeam, 2-lumbar piece, 210-hinge seat, 3-transmission rod, 4-support frame, 410-support part, 420-guide part, 421-guide groove, 422-limiting groove, 430-sliding protrusion, 5-elastic part, 6-mounting seat, 610-slide groove, 7-fixing part, 8-tension spring. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0019] Please refer to the attached document. Figure 1-7 This application provides a multi-link lumbar support device, including a lumbar support body 1, two symmetrical lumbar pieces 2, two transmission rods 3, and a support frame 4. The two lumbar pieces 2 are respectively disposed on the left and right sides of the lumbar support body 1, and each lumbar piece 2 is rotatably disposed relative to the lumbar support body 1. The lumbar support body 1 is movable relative to the support frame 4. The support frame 4 is provided with transverse support parts 410 on the left and right sides. Each support part 410 and the lumbar piece 2 are connected by a transmission rod 3. The rear end of the transmission rod 3 is hinged to the support part 410, and the front end of the transmission rod 3 is hinged to the lumbar piece 2. When the lumbar support body 1 is supported, the lumbar support body 1 moves toward the support frame 4. The lumbar support body 1 pulls the waist pieces 2 on both sides backward and pulls them inward in sync. The transmission rods 3 on both sides are driven by the waist pieces 2 to rotate inward in sync, which in turn causes the waist pieces 2 to rotate inward by a larger angle.

[0020] In this embodiment, the lumbar support body 1, lumbar pieces 2, transmission rod 3, and support frame 4 are hinged together to form a multi-link structure. The lumbar pieces 2 on both sides move inward synchronously as the lumbar support body 1 moves backward. That is, when the user's waist leans against the lumbar support body 1, the lumbar pieces 2 on both sides automatically move inward and hug the user's waist, providing a comfortable lumbar support effect. Furthermore, the lumbar pieces 2 and the support part 410 are connected by the transmission rod 3. When the lumbar pieces 2 tend to rotate inward, it pulls the transmission rod 3 to rotate inward as well, allowing the lumbar pieces 2 to rotate inward at a larger angle. This means the lumbar pieces 2 have a wider angle adjustment range and a higher degree of freedom of movement, providing a comfortable lumbar support effect even for slender users.

[0021] Please refer to the attached document. Figure 2-3 In some embodiments of this application, the left and right sides of the lumbar support body 1 are provided with connecting portions 110, which extend toward the rear side of the lumbar piece 2 and are hinged to the rear end of the lumbar piece 2.

[0022] In this embodiment, the connecting parts 110 on both sides of the lumbar support body 1 extend to the rear side of the lumbar piece 2 and are hinged to the lumbar piece 2. This not only hides the connection structure between the lumbar support body 1 and the lumbar piece 2 on the rear side and does not expose it, thus improving the aesthetics of the multi-link lumbar support device, but also allows the lumbar piece 2 to be rotated smoothly with the connecting parts 110 as the rotation fulcrum.

[0023] The waist piece 2 has two hinge seats 210 on the rear side. The hinge seat 210 closer to the waist support body 1 is hinged to the connecting part 110, and the hinge seat 210 further away from the waist support body 1 is hinged to the transmission rod 3. This makes the waist support body 1, waist piece 2 and transmission rod 3 form a lever-like structure. When the waist support body 1 moves, it can more smoothly and steadily pry the waist piece 2 and transmission rod 3 to move synchronously.

[0024] Preferably, the middle part of the connecting part 110 is recessed backward, and the recessed part of the connecting part 110 provides the waist piece 2 with a space for movement. This not only allows the waist piece 2 to fit more tightly with the waist support body 1, but also allows the connecting part 110 to avoid the waist piece 2 when the waist piece 2 is rotated in a large range, so that the rotation adjustment operation of the waist piece 2 is stable and smooth.

[0025] Of course, in other embodiments of this application, a connecting part 110 may be provided on the rear side of the waist piece 2, and the connecting part 110 extends toward the rear side of the waist support body 1 and is hinged to the rear side of the waist support body 1.

[0026] Please refer to the attached document. Figure 5-7In some embodiments of this application, a guide structure is provided between the lumbar support body 1 and the support frame 4. The guide structure includes a guide member 420 and a movable member 120. The guide member 420 is a hollow sleeve-shaped structure. The hollow part of the guide member 420 is configured as a guide groove 421. The movable member 120 is slidably connected to the guide member 420 through the guide groove 421. The movable member 120 is disposed in one of the lumbar support body 1 and the support frame 4, and the guide member 420 is disposed in the other of the lumbar support body 1 and the support frame 4.

[0027] In this embodiment, by setting a guide structure, the sleeve-shaped guide 420 is sleeved on the movable part 120 and restricts the movable part 120 to slide only in the front-back direction, thereby making the lumbar support body 1 slide only in the front-back direction relative to the support frame 4, which plays a guiding role for the lumbar support body 1 and restricts the movement direction of the lumbar support body 1. At the same time, it also makes the waist pieces 2 on both sides always rotate at the same tilt angle, making the waist-wrapping operation of the lumbar support device more stable and smooth, and avoiding the waist pieces 2 on both sides from not being able to synchronously close and clamp the user's waist due to the skewed movement direction of the lumbar support body 1.

[0028] Please refer to the attached document. Figure 5 In some embodiments of this application, a limiting structure is provided between the guide member 420 and the movable member 120. The limiting structure includes a screw and a limiting groove 422. The guide member 420 has a limiting groove 422 formed on its side wall, which extends in the front-back direction. The screw passes through the limiting groove 422 and is screwed to the movable member 120. When the movable member 120 moves back and forth, the screw moves back and forth along the limiting groove 422.

[0029] In this embodiment, by setting a limiting structure, the screw passes through the limiting groove 422, so that the guide 420 and the movable part 120 are also relatively fixed in the circumferential direction, and the movable part 120 cannot slide until the screw is disengaged from the limiting groove 422. That is, the range of motion of the movable part 120 is limited by the screw, so that the waist support device can be operated more smoothly and stably.

[0030] Please refer to the attached document. Figure 5 In some embodiments of this application, the lumbar support body 1 has a square frame structure. The lumbar support body 1 includes a lower crossbeam 130 arranged horizontally on the lower side, and a movable member 120 is arranged on the upper side of the lower crossbeam 130.

[0031] In this embodiment, by setting the lumbar support body 1 as a square frame, with the edges of the lumbar support body 1 covered with mesh fabric, and using the breathable and elastic mesh fabric to support the user's waist, the comfort level is high. Furthermore, by placing the movable part 120 on the upper side of the lower crossbeam 130, not only is the movable part 120 less likely to be exposed in the lumbar support device, improving aesthetics, but the upper side of the lumbar support body 1 is also more likely to undergo elastic deformation when subjected to a leaning force, thereby providing the user with stronger elastic support and further enhancing comfort.

[0032] Please refer to the attached document. Figure 5-7 In some embodiments of this application, an elastic element 5 is also provided in the guide groove 421. The elastic force of the elastic element 5 acts on the movable element 120, so that the movable element 120 always tends to move away from the guide element 420. This also causes the lumbar support body 1 to always tend to move forward under the push of the movable element 120, that is, the lumbar support body 1 always keeps in contact with the user's waist, and provides comfortable elastic support for the user's waist with the help of the elastic force of the elastic element 5.

[0033] Preferably, the elastic element 5 is a spring, which has good elasticity and low cost. The movable element 120 is also a sleeve-shaped structure. The hollow part of the movable element 120 is configured as a connecting groove 121. The front side of the elastic element 5 is inserted into the connecting groove 121, which makes the connection stability between the elastic element 5, the movable element 120 and the guide 420 better.

[0034] In some embodiments of this application, an elastic element 5 is provided between the waist piece 2 and the waist support body 1, and / or an elastic element 5 is provided between the waist piece 2 and the transmission rod 3. The elastic force of the elastic element 5 acts on the waist piece 2, so that the waist pieces 2 on both sides always have the tendency to expand outward.

[0035] In this embodiment, the elastic element 5 can also be a torsion spring, and is set at the hinge position between the waist piece 2 and the waist support body 1 or the transmission rod 3, so that the waist support body 1 always has a tendency to move forward under the drive of the waist piece 2, that is, the waist support body 1 always keeps in close contact with the user's waist, and provides comfortable elastic support for the user's waist with the help of the elastic force of the elastic element 5.

[0036] In some embodiments of this application, an elastic element 5 is provided between the transmission rod 3 and the waist piece 2, and / or an elastic element 5 is provided between the transmission rod 3 and the support portion 410. The elastic force of the elastic element 5 acts on the transmission rod 3, so that the transmission rods 3 on both sides always have a tendency to extend outward.

[0037] In this embodiment, the elastic element 5 can also be a torsion spring, and is set at the hinge position between the transmission rod 3 and the waist piece 2 or the support part 410, so that the waist piece 2 always has an outward tendency under the drive of the transmission rod 3, thereby driving the waist support body 1 to always have a forward tendency, that is, the waist support body 1 always keeps in close contact with the user's waist, and provides comfortable elastic support for the user's waist with the help of the elastic force of the elastic element 5.

[0038] Please refer to the attached document. Figure 4 In some embodiments of this application, the multi-link lumbar support device further includes a mounting base 6, which is configured to connect to the backrest. The support frame 4 is slidably connected to the front side of the mounting base 6. This allows the lumbar support body 1 and the lumbar support 2 to be adjusted vertically to meet the needs of users of various body types, further enhancing the adjustment freedom of the multi-link lumbar support device and making it more practical.

[0039] Please refer to the attached document. Figure 4 In some embodiments of this application, the front end face of the mounting base 6 is inclined, and the inclination direction is from front to back and from low to high.

[0040] In this embodiment, the front end face of the mounting base 6 is inclined, that is, when the support frame 4 slides up and down, its depth in the horizontal direction will also change synchronously, so that the position change of the lumbar support body 1 and the waist piece 2 is more in line with the human body's curved back curve, which is ergonomic.

[0041] The support frame 4 has four diagonally distributed sliding protrusions 430 on its rear side. The mounting base 6 has two vertically extending grooves 610 formed on its hollowed-out surface. The sliding protrusions 430 pass through the grooves 610 and can slide up and down along the grooves 610. The mounting base 6 has a fixing member 7 on its rear side. After the sliding protrusions 430 pass through the grooves 610, they are screwed together with the fixing member 7, so that the mounting base 6 is clamped between the support frame 4 and the fixing member 7. The three are relatively fixed in the horizontal direction. The fixing member 7 and the mounting base 6 are connected by a tension spring 8. The tension of the tension spring 8 acts on the fixing member 7, so that the support frame 4 and the fixing member 7 always have a tendency to slide upward relative to the mounting base 6.

[0042] It should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used above to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means three or more.

[0043] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A multi-link lumbar support device, comprising a lumbar support body (1), two symmetrical lumbar pieces (2), two transmission rods (3), and a support frame (4). The two lumbar pieces (2) are respectively disposed on the left and right sides of the lumbar support body (1), and each lumbar piece (2) is rotatably disposed relative to the lumbar support body (1). The lumbar support body (1) is movable relative to the support frame (4). The support frame (4) is provided with transverse support parts (410) on the left and right sides. Each support part (410) and the lumbar piece (2) are connected by a transmission rod (3). The rear end of the transmission rod (3) is hinged to the support part (410), and the front end of the transmission rod (3) is hinged to the lumbar piece (2). When the lumbar support body (1) is subjected to a leaning force, the lumbar support body (1) moves toward the support frame (4), and the lumbar support body (1) pulls the waist pieces (2) on both sides backward to pull them inward in sync. The transmission rods (3) on both sides are driven by the waist pieces (2) to rotate inward in sync, thereby causing the waist pieces (2) to rotate inward by a larger angle.

2. The multi-link lumbar support device according to claim 1, characterized in that, The lumbar support body (1) is provided with connecting parts (110) on both the left and right sides. The connecting parts (110) extend toward the rear side of the waist piece (2) and are hinged to the rear end of the waist piece (2).

3. The multi-link lumbar support device according to claim 1, characterized in that, A guide structure is provided between the lumbar support body (1) and the support frame (4). The guide structure includes a guide member (420) and a movable member (120). The guide member (420) is a hollow sleeve-shaped structure. The hollow part of the guide member (420) is configured as a guide groove (421). The movable member (120) is slidably connected to the guide member (420) through the guide groove (421). The movable member (120) is provided in one of the lumbar support body (1) and the support frame (4), and the guide member (420) is provided in the other of the lumbar support body (1) and the support frame (4).

4. The multi-link lumbar support device according to claim 3, characterized in that, A limiting structure is provided between the guide member (420) and the movable member (120). The limiting structure includes a screw and a limiting groove (422). The limiting groove (422) is formed on the side wall of the guide member (420) by hollowing out along the front-back direction. The screw passes through the limiting groove (422) and is screwed to the movable member (120). When the movable member (120) moves back and forth, the screw moves back and forth along the limiting groove (422).

5. The multi-link lumbar support device according to claim 3, characterized in that, The lumbar support body (1) has a square frame structure. The lumbar support body (1) includes a lower crossbeam (130) arranged horizontally on the lower side, and the movable part (120) is arranged on the upper side of the lower crossbeam (130).

6. The multi-link lumbar support device according to claim 3, characterized in that, An elastic element (5) is also provided in the guide groove (421). The elastic force of the elastic element (5) acts on the movable element (120), so that the movable element (120) always has a tendency to move away from the guide element (420).

7. The multi-link lumbar support device according to claim 1, characterized in that, An elastic element (5) is provided between the waist piece (2) and the waist support body (1), and / or an elastic element (5) is provided between the waist piece (2) and the transmission rod (3). The elastic force of the elastic element (5) acts on the waist piece (2), so that the waist pieces (2) on both sides always have the tendency to expand outward.

8. The multi-link lumbar support device according to claim 1, characterized in that, An elastic element (5) is provided between the transmission rod (3) and the waist piece (2), and / or an elastic element (5) is provided between the transmission rod (3) and the support part (410). The elastic force of the elastic element (5) acts on the transmission rod (3), so that the transmission rods (3) on both sides always have the tendency to expand outward.

9. The multi-link lumbar support device according to claim 1, characterized in that, The multi-link lumbar support device also includes a mounting base (6), which is configured to connect to the backrest, and the support frame (4) is slidably connected to the front side of the mounting base (6).

10. The multi-link lumbar support device according to claim 9, characterized in that, The front end face of the mounting base (6) is inclined, and the inclination direction is from front to back and from low to high.

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