Lumbar support seat with elastic locking function

Abstract

The present invention relates to the field of seat design and manufacturing, and specifically to the component design of elastic seats. The above technical purpose of the present invention is achieved through the following technical solutions: a lumbar support seat with an elastic locking function, comprising a seat body, a main back body and a lumbar support, and also comprising a base, a rotating arm rotatably connected to the base, and an elastic body 1 that provides elastic force for the rotating arm to rotate relative to the base; the lumbar support is connected to the rotating arm through an elastic body 2; and also comprises a locking device for locking the relative position of the rotating arm relative to the base. The purpose of the present invention is to overcome the shortcomings of the prior art and provide a lumbar support seat with an elastic locking function, which can not only track the back of the human body in real time, but also has a good elastic experience, a simple locking function structure, convenient operation, and controllable cost.

Description

Technical Field

[0001] The invention relates to the field of seat design and manufacturing, and in particular to the component design of an elastic seat. Background Art

[0002] Chairs are a type of furniture that is widely used in daily life and work. They usually include a base, backrest, support structure, armrests and other parts. In order to meet people's personalized needs and bring a more comfortable and healthy use experience, the structure and function of the chair are constantly improving. When users use chairs, they often rely on the base and backrest to support their hips and back, while the support of the waist is relatively weak. The muscles and spine of the waist and back of the human body will bear the pressure of the upper body weight. In the long run, lumbar muscle strain and spinal lesions will occur, causing inconvenience to people in learning, life and work.

[0003] In recent years, in order to provide support for the waist, seats with lumbar supports are appearing on the market. For example, the Chinese patent document with publication number CN201620974125.9 discloses a lumbar support device for a seat. This technical solution connects the lumbar support to the backrest to provide good support for the user's waist, making the user sit upright and having a good protective function for the lumbar spine. However, the existing lumbar support seats have the defect that the lumbar support does not fit tightly to the human body. That is, when the user's sitting posture is adjusted, such as leaning forward, the lumbar support often cannot be retracted and adjusted with the movement of the human body, and cannot continue to effectively fit the human body to support the waist, and the use effect of the lumbar support is less than ideal.

[0004] In this context, there are also improved technical solutions. For example, a Chinese patent document with publication number CN201711381616.8 discloses a lumbar support seat, in which the lumbar support can follow the forward and backward movement of the human body to provide supporting force.

[0005] Then this solution has certain defects in the actual market: first, the support of this kind of seat is relatively rigid, and the human comfort needs to be improved; second, the structure of this kind of seat is complex, and its elasticity and back-chasing functions are provided by gas springs, and the manufacturing and assembly costs of gas springs are high, which leads to high manufacturing costs at the production end and high sales prices at the sales end; third, and most importantly, under this structure, the locking of the lumbar support relies on the cooperation of the valve and the pawl. On the one hand, the cooperation structure of the valve and the pawl further increases the manufacturing cost, and on the other hand, the valve must be close to the hydraulic rod, and the pawl as the user's operating component must be set on the outside of the seat, which makes the arrangement positions of the valve and the pawl far apart, requiring third-party components to connect, further increasing the complexity and cost of the components. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a lumbar support seat with an elastic locking function. The lumbar support can not only follow the back of the human body in real time, but also has a good elastic experience, a simple locking function structure, convenient operation and controllable cost.

[0007] The above technical purpose of the present invention is achieved through the following technical solutions: a lumbar support chair with elastic locking function, comprising a seat body, a main back body and a lumbar support, and also comprising a base, a rotating arm rotatably connected to the base, and an elastic body 1 that provides elastic force for the rotating arm to rotate relative to the base; the lumbar support is connected to the rotating arm through an elastic body 2; and it also comprises a locking device for locking the relative position of the rotating arm relative to the base.

[0008] As a preferred embodiment of the present invention, the rotating arm includes a matching tooth, and the locking device includes a locking plate that moves closer to and away from the matching tooth under the operation of an operating member, and the locking plate is provided with a locking tooth for engaging with the matching tooth.

[0009] As a preferred embodiment of the present invention, the rotating arm includes a connecting cylinder rotatably connected to the base and an arm body connected to the connecting cylinder, the elastic body 2 is connected to the arm body, the mating teeth are located on the lower surface of the connecting cylinder and arranged in a circular array, and the locking device is located below the connecting cylinder.

[0010] As a preferred embodiment of the present invention, the locking device further includes a resilient member for providing elastic force for the locking disk to approach the connecting tube.

[0011] As a preferred embodiment of the present invention, the rotating arm includes an extension disc, and the locking device includes a clamping member for clamping the extension disc to prevent the rotating arm from rotating.

[0012] As a preferred embodiment of the present invention, the waist support is connected to a fixed shaft, and the fixed shaft is inserted into the second elastic body.

[0013] As a preferred embodiment of the present invention, the second elastic body is in the shape of a long cylinder, and an avoidance groove is opened on the second elastic body, and a plurality of the avoidance grooves are arranged in the circumferential direction of the second elastic body.

[0014] As a preferred embodiment of the present invention, the waist support includes a connecting arm, and the connecting arm is connected to the second elastic body; the waist support includes an outer frame and an inner frame, and the outer frame and the inner frame are respectively connected to different positions of the connecting arm in the length direction.

[0015] As a preferred embodiment of the present invention, there is one waist support, and the two rotating arms are connected to the one waist support.

[0016] As a preferred embodiment of the present invention, there are two waist supports, and the two rotating arms are respectively connected to the two waist supports.

[0017] In summary, the present invention has the following beneficial effects:

[0018] 1. The locking device and the rebound member have simple structures, and the production cost and installation cost are controllable.

[0019] 2. In addition, the present invention performs a locking operation on the rotating arm, and the rotating arm itself is located near the main back body and close to the human hand, so the connection cost is low and the user operation is more convenient.

[0020] 3. The locking structure allows the rotating arm to switch between the locked state and the free state, allowing the user to switch between the two support modes of "one-stage elastic support" and "two-stage elastic support", giving the user a different experience.

[0021] 4. When the user squeezes the lumbar support against the backrest, the lumbar support will be subjected to two elastic forces from elastic body 2 and elastic body 1, and the elastic force is more reliable.

[0022] 5. The elastic force direction of elastic body 2 is the front-to-back direction, and the elastic force direction of elastic body 1 is the horizontal rotation direction. The elastic forces in different directions cooperate with each other, and can provide elastic feedback to the user's different movements and different pressures, thereby improving the comfort of the chair back.

[0023] 6. Elastic components such as torsion springs, springs, elastic columns, etc. can be selected, and the cost is controllable.

[0024] 7. Double frame and double connection can provide better lateral fixing force for the connecting arm and increase the stability of the connection.

[0025] 8. The connecting arm is designed in an arc shape, and the center of the arc is close to the user's body, which can better fit the waist and back curve of the human body.

[0026] 9. The arm is designed in a horizontal arc shape, with the arc center facing backwards. This design not only makes the arm and the connecting arm fit more closely, but also provides space for the back of the seat, which is in line with the thin backrest design of modern seat designs.

[0027] 10. The setting of the avoidance slot makes it easier for the elastic body 2 to deform when squeezed, thereby making the elastic experience of the user softer.

[0028] 11. The lumbar support is connected to the main back body, but independent from the seat body and armrests. When the main back body can be lowered to provide a reclining function, the lumbar support also moves synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a front view of the first embodiment;

[0030] Figure 2This is an enlarged picture of the details of the waist support;

[0031] Figure 3 It is a schematic diagram of the locking device hidden behind the housing.

[0032] In the figure: 1, seat body, 2, main back body, 3, lumbar support, 31, main body, 311, outer frame, 312, inner frame, 32, connecting arm, 321, rear sticking section, 4, armrest, 51, base, 52, rotating arm, 521, connecting tube, 5211, matching teeth, 522, arm body, 5221, front convex section, 6, elastic body 2, 61, avoidance slot, 7, fixed shaft, 8, locking device, 81, locking plate, 811, locking teeth, 82, main block, 83, operating member, 91, chair leg assembly, 911, wheel body, 92, headrest. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0035] Embodiment 1, as Figure 1 As shown, a lumbar support chair with elastic locking function comprises a seat body 1 and a main back body 2. The lower surface of the seat body 1 is connected to a chair leg assembly 91, which comprises a wheel body 911. The main back body 2 is connected to a headrest 92. Armrests 4 are also installed on both sides of the seat body 1.

[0036] like Figure 2 and Figure 3 As shown, the lumbar support 3 is connected to the main back body 2. Specifically, the lumbar support 3 includes a frame-shaped main body 31, and the main body 31 is connected to a connecting arm 32. The connecting arm 32 generally extends laterally in the horizontal direction. In this embodiment, a double-frame double-connection method is adopted. That is, the main body 31 includes an outer frame 311 and an inner frame 312, which are respectively connected to different positions of the connecting arm 32. The outer frame 311 is connected to the root position of the connecting arm 32, and the inner frame 312 is connected to the position of the connecting arm 32 that is closer to the center of the main body 31. This arrangement is because the connecting arm 32 is a main load-bearing component, and the double-frame double connection can provide the connecting arm 32 with better lateral fixing force, thereby increasing the stability of the connection.

[0037] The connecting arm 32 is designed to be arc-shaped, and the center of the arc is close to the user's body, that is, the rear sticking section 321 in the figure. Such an arc-shaped design can better fit the waist and back curve of the human body.

[0038] like Figure 2 and Figure 3As shown, the base 51 is fixedly mounted on the main back body 2, and the rotating arm 52 is rotatably connected thereto, and the rotation direction is horizontal rotation. The rotation connection structure can adopt a common method in the prior art, such as a rotating shaft, etc. The rotating arm 52 includes a cylindrical connecting cylinder 521, in which an elastic body 1 is installed. The elastic body 1 is respectively connected to the rotating arm 52 and the base 51 to provide a restoring elastic force for the relative rotation of the two. The elastic body 1 can adopt a mature elastic component in the prior art, such as an extruded elastic block, such as a torsion spring.

[0039] The connecting tube 521 is fixedly connected with an arm 522. In the horizontal direction, the arm 522 is located behind the connecting arm 32, with the arm closer to the human body being the front and the arm farther away from the human body being the back. The arm 522 is also designed in a horizontal arc shape, i.e., the front convex section 5221 in the figure, but opposite to the connecting arm 32, the arc center direction thereof is backward. On the one hand, such a design makes the arm 522 and the connecting arm 32 more closely attached, and on the other hand, such an arc center design provides an escape space for the rear of the seat, which is in line with the thinness design of the backrest in modern seat design.

[0040] The end of the arm 522 is connected to an elastic body 2 6, which is also connected to the connecting arm 32. The elastic body 2 6 can be a common elastic component in the prior art, such as an elastic column or a compression spring made of an elastic material. In this embodiment, an elastic column is used. The elastic body 2 6 connects the connecting arm 32 and the rotating arm 52, and provides a restoring elastic force for the waist support 3 when the waist support 3 is squeezed by the human body.

[0041] At this point, in this case, when the user squeezes the lumbar support 3 against the backrest, the lumbar support 3 will be subjected to two elastic forces from the elastic body 2 6 and the elastic body 1, and the elastic force is more reliable; and the elastic force direction of the elastic body 2 6 is the front-to-back direction, and the elastic force direction of the elastic body 1 is the horizontal rotation direction. The elastic forces in different directions cooperate with each other, and can provide elastic feedback to the user's different movements and different pressures, thereby improving the comfort of leaning on the chair back.

[0042] In this embodiment, the elastic body 2 6 is cylindrical in shape, and a plurality of avoidance slots 61 are provided in its axial direction, so that it is easier to deform when squeezed, thereby making the elastic experience of the user softer.

[0043] In this example, there are two sets of rotating arms 52, one set on each side of the seat. The lumbar support 3 is an integral design and is a set. The two sets of rotating arms 52 are connected to one lumbar support 3. At this time, since the moving trajectory of the rotating arm 52 is a horizontal rotation, the horizontal spacing between the two connecting arms 32 will also change. In this case, a fixed shaft 7 is used to pass through the connecting arm 32 and insert the elastic body 2 6. Since the elastic body 2 6 is made of a cylindrical elastic material, it can not only deform in its axial direction, but also in its radial direction, so as to adapt to the change of the horizontal spacing between the two connecting arms 32.

[0044] In addition, in this embodiment, since the lumbar support 3, the base 51 and other components are directly or indirectly mounted on the main back body 2, rather than being mounted on the stool body 1 or the armrests 4, the lumbar support 3 is connected to the main back body 2, while being independent from the stool body 1 and the armrests 4. When the main back body 2 can be lowered to provide a lying function in some products, the lumbar support 3 also moves synchronously.

[0045] like Figure 3 As shown, Figure 3 The outer shell of the locking device 8 is hidden, so that the internal structure can be easily observed. There is also a locking device 8, which is used to lock the horizontal rotation angle of the rotating arm 52, and then lock the position of the lumbar support 3. When the rotating arm 52 is stationary relative to the main back body 2, the seat changes from "two-stage elastic provision" to "one-stage elastic provision", and the elastic support of the user's waist comes only from the elastic body 2 6, and the user obtains reliable and hard waist support.

[0046] Specifically, a plurality of matching teeth 5211 are provided on the lower surface of the connecting tube 521, and the matching teeth 5211 are evenly arranged in a circumferential array. The operating member 83 can be a traction rod or a traction rope, and its lower end extends to a suitable position for direct operation by the user, and its upper end is connected to the main block 82. The main block 82 can be used as a connecting medium and connected to the lower surface of the locking plate 81. The upper surface of the locking plate 81 includes a plurality of locking teeth 811 for engaging with the matching teeth 5211.

[0047] The locking device 8 is provided with a resilient member, such as a spring (not shown). One end of the spring can be connected to a fixed member, such as the main back body 2 or the base 51, and the other end can contact the locking plate 81, giving the locking plate 81 an opportunity to approach the connecting tube 521, that is, Figure 3 When the user overcomes the elastic force and pulls down the locking plate 81 through the operating member 83, the rotating arm 52 is in a free state and can rotate freely; when the user does not pull down the operating member 83, the locking plate 81 moves upward under the elastic force and locks the connecting tube 521. At this time, the rotating arm 52 is in a locked state and cannot rotate.

[0048] In this case, on the one hand, the locking device 8 and the resilient member have simple structures, and the production cost and installation cost are controllable. On the other hand, the locking operation is performed on the rotating arm, which is located near the main back body 2 and close to the human hand, so the connection cost is low and the user operation is more convenient.

[0049] Embodiment 2: The difference from Embodiment 1 is the design of the waist support 3, which is not an integrated design but a split design. That is, there are two waist supports 3, which are not connected in the middle. Each waist support 3 is connected to a rotating arm 52 through an elastic body 6.

[0050] Embodiment 3: The difference from Embodiment 1 is that there is no rebound member in the locking device 8 , and the user relies on the operating member 83 to move the locking plate 81 up and down.

[0051] Embodiment 4: The difference from Embodiment 1 is the automated design. Specifically, the up and down movement of the locking plate 81 in the locking device 8 is not dependent on manual pulling by the user, but on an electric transmission component. The electric transmission component can use an electric screw, a gear rack, an electric gas rod, etc. in the prior art.

[0052] Embodiment 5: The difference from Embodiment 1 is that the structure of the locking device 8 is different. Specifically, the lower side of the connecting tube 521 is not provided with the matching teeth 5211, but with a circle of extension discs. The locking device 8 includes a clamping member, such as a jaw, and when the brake locking position is required, it is only necessary to control the jaw to open and clamp the extension disc to lock the position of the connecting tube 521, thereby locking the extension angle of the rotating arm 52.

Claims

1. A lumbar support seat with an elastic locking function, comprising a seat body (1), a main back body (2) and a lumbar support (3), characterized in that: The invention also comprises a base (51), a rotating arm (52) rotatably connected to the base (51), and an elastic body (1) for providing elastic force for the rotating arm (52) to rotate relative to the base (51); the waist support (3) is connected to the rotating arm (52) via an elastic body (2) (6); and further comprises a locking device (8) for locking the relative position of the rotating arm (52) relative to the base (51); the waist support comprises a connecting arm (32) which is designed in an arc shape, and the arc center direction is close to the user's body; the rotating arm (52) comprises a connecting tube (521) rotatably connected to the base (51) and an arm body (522) connected to the connecting tube (521), and the arm body (522) is also designed in a horizontal arc shape, but the arc center direction is far away from the user's body; the elastic body (1) is a torsion spring, and the elastic body (2) (6) is a compression spring or an elastic column; the elastic force direction of the elastic body (1) is the horizontal rotation direction, and the elastic force direction of the elastic body (2) (6) is the front-back direction; The elastic body 1 and the elastic body 2 (6) are respectively located on both sides of the arm body (522) in the horizontal direction, the elastic body 1 is located on the side farther away from the horizontal center position of the seat, and the elastic body 2 (6) is located on the side closer to the horizontal center position of the seat.

2. A lumbar support seat with elastic locking function according to claim 1, characterized in that: The rotating arm (52) comprises a matching tooth (5211), and the locking device (8) comprises a locking plate (81) that moves closer to and away from the matching tooth (5211) under the operation of an operating member (83), and the locking plate (81) is provided with a locking tooth (811) for engaging with the matching tooth (5211).

3. The lumbar support seat with elastic locking function according to claim 2, characterized in that: The rotating arm (52) comprises a connecting tube (521) rotatably connected to the base (51) and an arm body (522) connected to the connecting tube (521); the second elastic body (6) is connected to the arm body (522); the matching teeth (5211) are located on the lower surface of the connecting tube (521) and are arranged in a circular array; and the locking device (8) is located below the connecting tube (521).

4. The lumbar support seat with elastic locking function according to claim 3, characterized in that: The locking device (8) further comprises a resilient member for providing elastic force for the locking disk (81) to move closer to the connecting tube (521).

5. The lumbar support seat with elastic locking function according to claim 1, characterized in that: The rotating arm (52) comprises an extension disc, and the locking device (8) comprises a clamping member for clamping the extension disc to prevent the rotating arm (52) from rotating.

6. A lumbar support seat with elastic locking function according to any one of claims 1 to 5, characterized in that: The waist support (3) is connected to a fixed shaft (7), and the fixed shaft (7) is inserted into the second elastic body (6).

7. The lumbar support seat with elastic locking function according to claim 6, characterized in that: The elastic body 2 (6) is in the shape of a long cylinder, and is provided with an escape slot (61). A plurality of the escape slots (61) are arranged in the circumferential direction of the elastic body 2 (6).

8. The lumbar support seat with elastic locking function according to claim 1, characterized in that: The waist support comprises a connecting arm (32), wherein the connecting arm (32) is connected to the second elastic body (6); the waist support (3) comprises an outer frame (311) and an inner frame (312), wherein the outer frame (311) and the inner frame (312) are respectively connected to the connecting arm (32) at different positions in the length direction.

9. A lumbar support seat with elastic locking function according to any one of claims 1 to 5, characterized in that: There is one waist support (3), and two rotating arms (52) are connected to one waist support (3).

10. A lumbar support seat with elastic locking function according to any one of claims 1 to 5, characterized in that: There are two waist supports (3), and the two rotating arms (52) are respectively connected to the two waist supports (3).

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