Waist rest stepless adjusting device

Abstract

The utility model discloses a waist rest stepless adjusting device which comprises a back support, the front end of the back support is sunken to form a transverse sliding cavity, and a sliding piece is slidably connected into the sliding cavity; a thread adjusting rod with an external thread is further transversely arranged in the sliding cavity, and the thread adjusting rod can rotate around the axial direction of the thread adjusting rod; the threaded adjusting rod penetrates through and is in threaded connection with the sliding piece. The top end of the waist rest body is hinged to the back support, a push-pull piece is hinged to the lower end of the waist rest body, the rear end of the push-pull piece penetrates into the sliding cavity and is vertically connected with the sliding piece, and a guide mechanism is arranged between the push-pull piece and the sliding piece and comprises a clamping head and a guide groove which are in sliding fit with each other; the guide groove is formed in one of the push-pull piece and the sliding piece in the left-right direction, and the clamping head is correspondingly arranged on the other one of the push-pull piece and the sliding piece. The guide groove is obliquely arranged. According to the stepless adjusting device for the waist rest, the mode of adjusting the waist rest body through the threaded adjusting rod belongs to stepless adjustment, the degree of freedom is high, and callback operation is easy and convenient.

Description

Technical Field

[0001] The utility model generally relates to the technical field of seats, and in particular to a lumbar support stepless adjustment device. Background Art

[0002] The lumbar support is a common component in chairs, supporting the curved lumbar spine and preventing it from bending outward due to fatigue, thus maintaining lumbar health. Most existing chairs have lumbar supports fixed to the backrest, but in practice, different people have different needs for lumbar supports. For office workers who spend long periods of time sitting, they need a lumbar support that is closer to the front to fit the waist and provide support. For those who relax or rest in the chair, however, they prefer a more relaxed lumbar support that doesn't require significant support.

[0003] To meet user needs, the inventors previously applied for a patent for a stable lumbar support linkage adjustment device (application number: CN202323369253.X). This device hinges the lumbar support body, a first ratchet member, a second ratchet member, and an upper link to form a four-bar linkage. A ratchet mechanism adjusts the gear position between the first and second ratchet members. The ratchet mechanism has three to five adjustment positions. When the lumbar support body rotates back and forth (that is, when the upper end of the lumbar support body rotates back and forth around the hinge point at the bottom), one end of the upper link is driven by the lumbar support body to swing back and forth horizontally. This in turn drives the second ratchet member at the other end of the upper link to rotate back and forth, driving the ratchet mechanism between the first and second ratchet members to switch between different gears and pause at the corresponding gear, allowing the lumbar support body to provide support at different positions and angles. The gear adjustment is simple to operate and the support effect is stable and reliable.

[0004] In the spirit of continuous improvement, the inventors have discovered that the following aspects of this solution can be optimized: adjusting the inclination angle of the lumbar support body through the ratchet structure is a stepless adjustment, and the lumbar support body can only be fixed at a few preset gears, unable to achieve more precise adjustment, and has a low degree of freedom; and, when the gear of the lumbar support body needs to be called back, the lumbar support body can only be adjusted forward to the maximum gear before the ratchet structure can be reset and the gear can be readjusted, which makes the callback operation of the lumbar support body not simple enough. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a lumbar support stepless adjustment device, which can adjust the inclination angle of the lumbar support body by rotating the threaded adjustment rod. The threaded adjustment rod can stop at any rotation angle, so that the lumbar support body can be fixed at any inclination angle. It is a stepless adjustment with a high degree of freedom. When the lumbar support body needs to be recalled, it is only necessary to rotate the threaded adjustment rod in the opposite direction to drive the push-pull member to pull the lumbar support body back. The adjustment operation is very simple.

[0006] The effect of the utility model is achieved in this way:

[0007] The embodiment of the present application provides a lumbar support stepless adjustment device, comprising:

[0008] The back bracket has a front end recessed to form a transverse sliding cavity, in which a sliding member is slidably connected; a threaded adjustment rod with an external thread is also transversely arranged in the sliding cavity, the threaded adjustment rod being axially fixed and rotatable around itself; the threaded adjustment rod passes through and is threadedly connected to the sliding member, and the sliding member is limited by the sliding cavity and cannot rotate circumferentially, so that when the threaded adjustment rod rotates, the sliding member is forced to slide left and right along the sliding cavity;

[0009] The lumbar support body, the top end of the lumbar support body is hinged to the back support, the lower end of the lumbar support body is hinged to a push-pull member, the rear end of the push-pull member penetrates the sliding cavity and cooperates with the sliding member, and a guide mechanism is provided between the push-pull member and the sliding member, the guide mechanism includes a clamping head and a guide groove that slide with each other, the guide groove is provided in the left and right directions on one of the push-pull member and the sliding member, and the clamping head is correspondingly provided on the other of the push-pull member and the sliding member; the guide groove is inclined, so that when the clamping head slides left and right along the guide groove, it will drive the push-pull member to slide back and forth relative to the sliding member, and the bottom end of the lumbar support body is pushed or pulled by the push-pull member, thereby rotating back and forth relative to the back support to adjust the inclination angle.

[0010] Furthermore, the clamping head is provided on the front side of the sliding member, and the guide groove is provided on the rear side of the push-pull member. By providing the guide groove on the wider push-pull member, the guide groove can be made wider, that is, the push-pull member has a larger forward and backward sliding stroke, and the angle adjustment range of the lumbar support body is larger.

[0011] Furthermore, a knob is provided on at least one of the left and right sides of the back support, and the knob extends from one side close to the back support to form a columnar first connecting portion. A through hole is correspondingly opened on the side wall of the back support, and the through hole is connected to the sliding cavity. The first connecting portion passes through the through hole and is connected to the end of the threaded adjustment rod, so that the knob can drive the threaded adjustment rod to rotate, so that the user can drive the threaded adjustment rod to rotate by turning the knob, making the rotation adjustment operation of the lumbar support body easier.

[0012] Furthermore, the first connecting portion is detachably connected to the end of the threaded adjustment rod by a threaded connection. This allows the knob and the threaded adjustment rod to be manufactured separately, simplifying the manufacturing process. Furthermore, the threaded connection not only improves the connection strength between the two, but also facilitates installation and removal.

[0013] Furthermore, knobs are provided on both the left and right sides of the back support, which not only makes it easier for the user to operate the knobs, but also makes the adjustment operation of the threaded adjustment rod smoother.

[0014] Furthermore, the first connecting portion has a stepped protrusion structure around it, and the through hole is also stepped and recessed accordingly, so that the knob and the threaded adjustment rod remain relatively fixed to the back support in the horizontal direction, thereby improving the stability of the rotation adjustment operation of the lumbar support body.

[0015] Furthermore, the front end of the back support is detachably connected to a support base, which is hollowed out along the front and back directions to form a sliding cavity. By arranging the support base and the back support as a split structure, the overall structure of the back support is relatively simple and easy to process and manufacture.

[0016] Furthermore, the rear end of the support seat is recessed in the left-right direction to form an arc-shaped first half-hole, and the front end of the back bracket is correspondingly recessed to form a second half-hole. The first half-hole and the second half-hole combine to form a cylindrical through-hole. A knob is provided on at least one of the left and right sides of the back bracket. The knob extends from the side closest to the back bracket to form a cylindrical first connecting portion, which passes through the through-hole and connects to the end of the threaded adjustment rod. This allows the knob and the threaded adjustment rod to be detachably mounted between the back bracket and the connecting seat, thereby simplifying the installation and removal of the seat.

[0017] Furthermore, the support base is detachably connected to the back bracket by screw connection, which not only makes the connection strength between the support base and the back bracket more reliable, but also makes the installation and removal operations of the support base more convenient.

[0018] The present application provides a stepless lumbar support adjustment device that converts the rotation of a threaded adjustment rod into the left and right sliding of a sliding member. The guide assembly then drives the push-pull member to push or pull the lumbar support body in response to the sliding of the sliding member, thereby adjusting the tilt angle of the lumbar support body. The threaded adjustment rod can be stopped at any rotation angle, allowing the lumbar support body to be fixed at any tilt angle. This provides stepless adjustment with a high degree of freedom. Furthermore, to adjust the lumbar support body, simply rotate the threaded adjustment rod in the opposite direction, driving the push-pull member to pull the lumbar support body back, making the adjustment operation very simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a seat provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the side structure of the seat when the lumbar support body provided in an embodiment of the present application is rotated backward to the minimum position;

[0022] Figure 3 This is a schematic diagram of the side structure of the seat when the lumbar support body provided by an embodiment of the present application is rotated forward to the maximum position;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the seat when the lumbar support body provided in an embodiment of the present application is rotated backward to the minimum position;

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of the seat when the lumbar support body provided in an embodiment of the present application is rotated forward to the maximum position;

[0025] Figure 6 A schematic diagram of the connection structure between the back support and the lumbar support body provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the connection structure between the support base and the back support provided in an embodiment of the present application;

[0027] Figure 8 Schematic diagram of the connection structure between the lumbar support body and the pushing member provided in an embodiment of the present application.

[0028] The figures are marked as follows: 1-back support, 101-sliding cavity, 102-through hole, 102a-first half hole, 102b-second half hole, 103-avoidance groove, 110-sliding part, 111-clamp, 112-fitting part, 120-threaded adjustment rod, 121-second connecting part, 130-support seat, 140-knob, 141-first connecting part, 2-lumbar support body, 210-push-pull part, 211-guide groove. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant utility model and are not intended to limit the utility model. It should also be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings.

[0030] Please refer to the attached Figure 1-8 The embodiment of the present application provides a lumbar support stepless adjustment device, comprising:

[0031] The back support 1 has a recessed front end forming a transverse sliding cavity 101, in which a sliding member 110 is slidably connected; a threaded adjustment rod 120 having an external thread is also transversely disposed in the sliding cavity 101, the threaded adjustment rod 120 being axially fixed and rotatable circumferentially; the threaded adjustment rod 120 passes through and is threadedly connected to the sliding member 110, and the sliding member 110 is limited by the sliding cavity 101 and cannot rotate circumferentially, so that when the threaded adjustment rod 120 rotates, the sliding member 110 is forced to slide left and right along the sliding cavity 101;

[0032] The lumbar support body 2, the top of the lumbar support body 2 is hinged to the back support 1, and the lower end of the lumbar support body 2 is hinged with a push-pull member 210, the rear end of the push-pull member 210 penetrates the sliding cavity 101 and cooperates with the sliding member 110, and a guide mechanism is provided between the push-pull member 210 and the sliding member 110, and the guide mechanism includes a clamping head 111 and a guide groove 211 that slide with each other, the guide groove 211 is arranged in the left and right directions on one of the push-pull member 210 and the sliding member 110, and the clamping head 111 is correspondingly arranged on the other of the push-pull member 210 and the sliding member 110; the guide groove 211 is arranged at an angle, so that when the clamping head 111 slides left and right along the guide groove 211, it will drive the push-pull member 210 to slide back and forth relative to the sliding member 110, and the bottom end of the lumbar support body 2 is pushed or pulled by the push-pull member 210, thereby rotating back and forth relative to the back support 1 to adjust the inclination angle.

[0033] In this embodiment, the tilt angle of the lumbar support body 2 is adjusted by converting the rotation of the threaded adjustment rod 120 into the left and right sliding of the slider 110. The guide assembly then drives the push-pull member 210 to push or pull the lumbar support body 2 in response to the sliding of the slider 110, thereby adjusting the tilt angle of the lumbar support body 2. The threaded adjustment rod 120 can be stopped at any rotation angle, allowing the lumbar support body 2 to be fixed at any tilt angle. This provides infinite adjustment and a high degree of freedom. Furthermore, to adjust the lumbar support body 2, simply rotate the threaded adjustment rod 120 in the opposite direction, driving the push-pull member 2 to pull the lumbar support body 2 back, making adjustment very simple.

[0034] Please refer to the attached Figure 4-5 In some embodiments of the present application, the clamping head 111 is arranged on the front side of the sliding member 110 , and the guide groove 211 is opened on the rear side of the push-pull member 210 .

[0035] In this embodiment, by providing the guide slot 211 on the wider push-pull member 210, the guide slot 211 can be made wider, that is, the push-pull member 210 has a larger forward and backward sliding stroke, and the angle adjustment range of the lumbar support body 2 is larger. Of course, in other embodiments of the present application, the clamping head 111 can also be provided on the rear side of the push-pull member 210, and the guide slot 211 is correspondingly provided on the front side of the sliding member 110.

[0036] The sliding member 110 is a block-shaped structure as a whole, and the rear end is hollowed out along the left and right directions to form an internal threaded hole that cooperates with the threaded adjustment rod 120. The front end of the sliding member 110 extends forward to form a plate-shaped fitting portion 112, which fits the lower end of the push-pull member 210. The top of the fitting portion 112 extends upward to form a columnar clamping head 111, and the lower end of the push-pull member 210 is correspondingly recessed to form a guide groove 211. During the rotation of the lumbar support body 2, the height of its bottom end in the vertical direction will change accordingly. By connecting the push-pull member 210 and the fitting portion 112 up and down, during the adjustment process, the push-pull member 210 can be slightly tilted upward relative to the fitting portion 112, thereby conforming to the rotation of the lumbar support body 2, making the adjustment process smoother.

[0037] Please refer to the attached Figure 6-7 In some embodiments of the present application, a knob 140 is provided on at least one of the left and right sides of the back support 1. The knob 140 extends from the side of the back support 1 to form a cylindrical first connecting portion 141. A through hole 102 is correspondingly formed on the side wall of the back support 1. The through hole 102 communicates with the sliding cavity 101. The first connecting portion 141 passes through the through hole 102 and connects to the end of the threaded adjustment rod 120, so that the knob 140 can drive the threaded adjustment rod 120 to rotate. This allows the user to rotate the threaded adjustment rod 120 by turning the knob 140, making the rotation adjustment operation of the lumbar support body 2 more convenient.

[0038] Please refer to the attached Figure 7 In some embodiments of the present application, the first connecting portion 141 is detachably connected to the end of the threaded adjustment rod 120 by a threaded connection.

[0039] In this embodiment, the end of the threaded adjustment rod 120 extends in the opposite direction along its length to form a second connecting portion 121. A threaded hole is radially provided on the second connecting portion 121. The first connecting portion 141 is a sleeve-like structure and has a corresponding connecting hole. When the first connecting portion 141 is sleeved onto the end of the second connecting portion 121, the connecting hole of the first connecting portion 141 aligns with the threaded hole of the second connecting portion 121, allowing a screw to be screwed in to secure the two. This allows the knob 140 and the threaded adjustment rod 120 to be manufactured separately, making processing and manufacturing operations relatively simple. Moreover, the threaded connection not only improves the connection strength between the two, but also makes installation and disassembly operations relatively simple.

[0040] Please refer to the attached Figure 6-7 In some embodiments of the present application, knobs 140 are provided on both sides of the back support 1, which makes it easier for users to operate the knobs 140, making it more convenient to use and balancing the two sides of the threaded adjustment rod 120, making the adjustment operation smoother.

[0041] Please refer to the attached Figure 6-7 In some embodiments of the present application, the first connecting portion 141 has a stepped protrusion structure on its periphery, and the through hole 102 also has a corresponding stepped depression. When the first connecting portion 141 is inserted into the through hole 102, the first connecting portion 140 and the through hole 102 are relatively fixed in the horizontal direction, preventing the knob 140 from easily detaching from the back support 1. This strengthens the connection between the knob 140, the threaded adjustment rod 120 connected to the knob 140, and the back support 1, and improves the stability of the rotational adjustment operation of the lumbar support body 2.

[0042] Please refer to the attached Figure 7 In some embodiments of the present application, the front end of the back support 1 is detachably connected to a support seat 130 , and the support seat 130 is hollowed out in the front-to-back direction to form a sliding cavity 101 .

[0043] In this embodiment, the back bracket 1 is an integrally molded structure made of plastic. By opening the sliding cavity 101 on the support seat 130 and the support seat 130 being detachably arranged on the back bracket 1, the overall structure of the back bracket 1 is relatively simple and easy to process and manufacture.

[0044] Please refer to the attached Figure 7 In some embodiments of the present application, the rear end of the support seat 130 is recessed in the left and right directions to form an arc-shaped first half hole 102a, and the front end of the back bracket 1 is correspondingly recessed to form a second half hole 102b. The first half hole 102a and the second half hole 102b are combined to form a cylindrical through hole 102; a knob 140 is provided on at least one of the left and right sides of the back bracket 1, and the knob 140 extends from one side close to the back bracket 1 to form a cylindrical first connecting portion 141. The first connecting portion 141 passes through the through hole 102 and is connected to the end of the threaded adjustment rod 120.

[0045] In the embodiment itself, by splitting the through hole 102 into the first half hole 102a and the second half hole 102b, the knob 140 and the threaded adjustment rod 120 can also be detachably installed between the back bracket 1 and the connecting seat 130. During installation, it is only necessary to first connect the first connecting part 141 to the end of the threaded adjustment rod 120, and then place the first connecting part 141 in the first half hole 102a or the second half hole 102b, and then install the support seat 130 into the back bracket 1, so that the first connecting part 141 is clamped between the first half hole 102a and the second half hole 102b, and then the knob 140, the threaded adjustment rod 120, the connecting seat 130 and the back bracket 1 can be installed together, making the installation and disassembly operations of the seat easier.

[0046] Among them, the front end of the back bracket 1 is also recessed backward to form an avoidance groove 103. When the threaded adjustment rod 120 is installed to the back bracket 1, the threaded adjustment rod 120 is located in the avoidance groove 103, thereby avoiding affecting the rotation of the threaded adjustment rod 120.

[0047] Please refer to the attached Figure 7 In some embodiments of the present application, the support base 130 is detachably connected to the back support 1 via screws. Several lugs extend from the circumference of the support base 130, each with a connection hole. The front surface of the back support 1 has corresponding threaded holes. After the support base 130 is mounted to the back support 1, screws are inserted through the lugs to secure the connection base 130 to the back support 1. This not only ensures a more reliable connection between the support base 130 and the back support 1, but also facilitates installation and removal of the support base 130.

[0048] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means more than three.

[0049] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the utility model. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A lumbar support stepless adjustment device, characterized in that: include: A back support (1), wherein the front end of the back support (1) is recessed to form a transverse sliding cavity (101), and a sliding member (110) is slidably connected in the sliding cavity (101); a threaded adjustment rod (120) having an external thread is also transversely arranged in the sliding cavity (101), and the threaded adjustment rod (120) is axially fixed and can rotate around itself; the threaded adjustment rod (120) passes through and is threadedly connected to the sliding member (110), and the sliding member (110) is limited by the sliding cavity (101) and cannot rotate circumferentially, so that when the threaded adjustment rod (120) rotates, the sliding member (110) is forced to slide left and right along the sliding cavity (101); A lumbar support body (2), the top end of the lumbar support body (2) is hinged to the back support (1), the lower end of the lumbar support body (2) is hinged to a push-pull member (210), the rear end of the push-pull member (210) penetrates the sliding cavity (101) and cooperates with the sliding member (110), a guide mechanism is provided between the push-pull member (210) and the sliding member (110), the guide mechanism includes a clamping head (111) and a guide groove (211) that slide with each other, and the guide groove (211) is provided on the push-pull member (210) along the left and right directions. 0) and one of the sliding members (110), the clamping head (111) is correspondingly arranged on the other of the push-pull member (210) and the sliding member (110); the guide groove (211) is inclined so that when the clamping head (111) slides left and right along the guide groove (211), it drives the push-pull member (210) to slide forward and backward relative to the sliding member (110), and the bottom end of the lumbar support body (2) is pushed or pulled by the push-pull member (210), thereby rotating forward and backward relative to the back support (1) to adjust the tilt angle.

2. The lumbar support stepless adjustment device according to claim 1, characterized in that: The clamping head (111) is arranged on the front side of the sliding member (110), and the guide groove (211) is opened on the rear side of the push-pull member (210).

3. The lumbar support stepless adjustment device according to claim 1, characterized in that: A knob (140) is provided on at least one of the left and right sides of the back bracket (1), and the knob (140) extends from one side close to the back bracket (1) to form a columnar first connecting portion (141). A through hole (102) is correspondingly opened on the side wall of the back bracket (1), and the through hole (102) is connected to the sliding cavity (101). The first connecting portion (141) passes through the through hole (102) and is connected to the end of the threaded adjustment rod (120), so that the knob (140) can drive the threaded adjustment rod (120) to rotate.

4. The lumbar support stepless adjustment device according to claim 3, characterized in that: The first connecting portion (141) is detachably connected to the end of the threaded adjustment rod (120) by means of a threaded connection.

5. The lumbar support stepless adjustment device according to claim 3, characterized in that: The knobs (140) are provided on both the left and right sides of the back support (1).

6. The lumbar support stepless adjustment device according to claim 3, characterized in that: The first connecting portion (141) has a stepped convex structure on its circumference, and the through hole (102) also has a stepped concave structure accordingly.

7. The lumbar support stepless adjustment device according to claim 1, characterized in that: The front end of the back support (1) is detachably connected to a support seat (130), and the support seat (130) is hollowed out in the front-to-back direction to form the sliding cavity (101).

8. The lumbar support stepless adjustment device according to claim 7, characterized in that: The rear end of the support seat (130) is recessed in the left and right directions to form an arc-shaped first half hole (102a), and the front end of the back bracket (1) is correspondingly recessed to form a second half hole (102b), and the first half hole (102a) and the second half hole (102b) are combined to form a cylindrical through hole (102); at least one of the left and right sides of the back bracket (1) is provided with a knob (140), and the knob (140) extends from one side close to the back bracket (1) to form a cylindrical first connecting portion (141), and the first connecting portion (141) passes through the through hole (102) and is connected to the end of the threaded adjustment rod (120).

9. The lumbar support stepless adjustment device according to claim 7, characterized in that: The support seat (130) is detachably connected to the back support (1) by means of screw connection.

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