Lumbar support curvature adjustment mechanism and adjustable lumbar support

Abstract

A lumbar support curvature adjustment mechanism provided with a backrest (30) having a variable curvature to fit the lumbar curvatures of different users, and an adjustable lumbar support (100, 300) comprising the curvature adjustment mechanism. The curvature adjustment mechanism comprises: a base plate (40), one end of which is connected to one end of the backrest (30); and a range limiting member (42), wherein the other end of the backrest (30) is slidable relative to the base plate (40), and the range limiting member (42) is configured to limit the other end of the backrest (30) within different slidable ranges, thereby changing a distance change range of the other end of the backrest (30) relative to one end of the backrest (30), and adjusting a curvature change range of the backrest (30).

Description

Lumbar support curvature adjustment mechanism and adjustable lumbar support Technical Field

[0001] The invention relates to a lumbar support curvature adjustment mechanism and an adjustable lumbar support comprising the lumbar support curvature adjustment mechanism. Background Art

[0002] In car seats and other seating with backrests, the backrests often do not conform well to the user's waist and back, resulting in poor support. Therefore, some users often need additional support such as cushions and lumbar supports.

[0003] In the prior art, some lumbar supports used for support have an adjustment function so that the backrest can better adapt to the body shape requirements of different users. For example, CN201910434934.9 discloses an adjustable lumbar support, which can adjust the angle of the lumbar board through an adjustment mechanism, thereby achieving support adjustment in the front and back directions; CN202222166953.8 discloses a multi-directional adjustable lumbar support, which can be moved up and down by a slider and rail structure, and adjusted front and back by a rotating shaft. In this type of lumbar support, since the front and back adjustment of the backrest is achieved by angle adjustment, the shape of the backrest itself, especially its curvature, will basically not change, resulting in the backrest being able to adapt to the waist position of users of different body shapes, but it is difficult to adapt to the waist curvature of different users.

[0004] Summary of the Invention

[0005] In order to solve the above problems, a lumbar support is provided with a backrest with a variable curvature so as to adapt to the waist curvature of different users. The present invention adopts the following technical solutions.

[0006] The present invention provides a lumbar support curvature adjustment mechanism for adjusting the curvature variation range of a backrest plate of a lumbar support, and is characterized in that it includes: a base plate, one end of which is connected to one end of the backrest plate; and a range limiting member, wherein the other end of the backrest plate is slidable relative to the base plate, and the range limiting member is used to limit the other end of the backrest plate to different sliding ranges, thereby changing the distance variation range of the other end of the backrest plate relative to one end of the backrest plate, thereby achieving adjustment of the curvature variation range of the backrest plate.

[0007] The lumbar support curvature adjustment mechanism provided by the present invention may also have such a technical feature, wherein the range limiting member has a cam portion, and the cam portion is provided with at least two cam limiting surfaces, and the distances between the cam limiting surfaces and the center of the cam portion are different.

[0008] Furthermore, the above-mentioned lumbar support curvature adjustment mechanism provided by the present invention may also include: a sliding member, which is slidably arranged on the base plate, wherein the other end of the back plate is hinged on the sliding member, and the sliding member has a sliding member limiting surface facing the cam portion. The range limiting member can be rotated under the operation of the user so that different cam limiting surfaces face the sliding member limiting surface, thereby limiting the sliding member through different cam limiting surfaces.

[0009] Furthermore, the lumbar support curvature adjustment mechanism provided by the present invention may also have such a technical feature, wherein the sliding member has a through groove, the cam portion is located in the through groove, and the limiting surface of the sliding member is the inner surface of the through groove.

[0010] In addition, the above-mentioned lumbar support curvature adjustment mechanism provided by the present invention may also have such a technical feature, wherein the sliding member has a receiving portion capable of receiving the cam portion, and the limiting surface of the sliding member is the inner upper surface of the receiving portion.

[0011] The lumbar support curvature adjustment mechanism provided by the present invention may also have such a technical feature, wherein a guide strip is provided on the base plate for guiding the sliding member to slide relative to the base plate.

[0012] Furthermore, the above-mentioned lumbar support curvature adjustment mechanism provided by the present invention may also include: an elastic member for providing a tendency force to the sliding member toward one end of the backrest plate, the elastic member is a spring wire, and the other end of the two guide strips is respectively provided with a slot, and the two ends of the elastic member are respectively engaged in the slots, and the sliding member is also provided with a hook, which is hooked in the middle of the elastic member; or the elastic member is a tension spring, and the two ends of the tension spring are respectively connected to the sliding member and the base plate.

[0013] The above-mentioned lumbar support curvature adjustment mechanism provided by the present invention may also have such a technical feature, wherein the cam portion has a sliding member limiting surface facing the other end of the backrest, and the range limiting member can be rotated under the operation of the user so that different cam limiting surfaces face the other end of the base plate, thereby limiting the other end of the base plate through different cam limiting surfaces.

[0014] Furthermore, the above-mentioned lumbar support curvature adjustment mechanism provided by the present invention may also include: a cover member, covering the range limiting member, the cover member is provided with a plurality of first magnetic members, the cam portion is provided with a second magnetic member that can be attracted to the first magnetic member, when the second magnetic member is rotated in turn to a position aligned with one of the first magnetic members, one of the cam limiting surfaces can limit the other end of the backrest.

[0015] The above-mentioned lumbar support curvature adjustment mechanism provided by the present invention may also have such a technical feature, wherein the lower end portion of the backrest plate can be slidably arranged on the base plate, and the range limiting member can be rotated under the operation of the user so that different cam limiting surfaces face the lower end portion of the backrest plate, thereby limiting the lower end portion of the backrest plate through different cam limiting surfaces.

[0016] In addition, the above-mentioned lumbar support curvature adjustment mechanism provided by the present invention may further include: a sliding member, which is slidably arranged on the base plate, wherein the other end of the support plate is hinged on the sliding member, and the range limiting member is a slider installed on the base plate which can slide left and right, and the slider has a slider paddle protruding beyond the lower edge of the base plate, and the range limiting member has multiple horizontal surfaces serving as slider limiting surfaces, and the distances between each slider limiting surface and the lower edge of the base plate are different.

[0017] The above-mentioned lumbar support curvature adjustment mechanism provided by the present invention may also have such technical features, wherein the lower end portion of the backrest is slidably arranged on the base plate, the range limiting member is a slider mounted on the base plate which can slide left and right, the slider having a slider paddle protruding beyond the lower edge of the base plate, the range limiting member having a plurality of horizontal surfaces serving as slider limiting surfaces, and the distances between each slider limiting surface and the lower edge of the base plate are different.

[0018] In addition, the above-mentioned lumbar support curvature adjustment mechanism provided by the present invention may further include: a sliding member, which is slidably arranged on the base plate, wherein the other end of the support plate is hinged on the sliding member, the range limiting member is a limit screw, and one end of the limit screw is provided with a handle, and a mounting member with a screw hole is fixedly provided on the base plate, the limit screw is screwed into the screw hole, the handle is exposed below the mounting member and is exposed downward from the lower edge of the base plate, and the sliding member is provided with a protrusion that can abut against the upper end of the limit screw.

[0019] The present invention also provides an adjustable lumbar support, characterized in that it includes: a backrest for supporting the user's waist; and a lumbar support curvature adjustment mechanism for limiting the change in the curvature of the backrest of the lumbar support, wherein the lumbar support curvature adjustment mechanism is any of the lumbar support curvature adjustment mechanisms described above.

[0020] Functions and effects of the invention

[0021] According to the curvature adjustment mechanism and adjustable lumbar support provided by the present invention, since one end of the base plate is connected to one end of the back plate, and the other end of the back plate is movable relative to the end, the back plate can be deformed to a certain extent according to the force applied by the user's waist, so that its curvature can change in real time according to the user's waist curve, thereby better fitting the user's waist curve; further, since the range limiting member limits the other end of the back plate to different sliding ranges, thereby being able to adjust the range of change of the curvature of the back plate, the user can adjust the range of change of the curvature of the back plate to be larger or smaller according to his or her own usage needs, thereby improving the usage experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a perspective view of an adjustable lumbar support according to Example 1 of the present invention from one angle;

[0023] FIG2 is a perspective view of the adjustable lumbar support according to Example 1 of the present invention from another angle;

[0024] FIG3 is a side view of the adjustable lumbar support according to Example 1 of the present invention;

[0025] FIG4 is an exploded view of the adjustable lumbar support according to Example 1 of the present invention;

[0026] 5 is an enlarged view of the mounting portion of the upper end of the back plate of the substrate of Example 1 of the present invention;

[0027] FIG6 is a structural diagram of a sliding member according to Example 1 of the present invention;

[0028] 7 is a partial exploded view of the sliding member and the range limiting member mounting structure of the substrate in Example 1 of the present invention;

[0029] 8 is a partial structural diagram of the mounting portion of the range limiting member of the substrate of Example 1 of the present invention;

[0030] 9 is a structural diagram of a range limiting member according to embodiment 1 of the present invention;

[0031] 10 is a schematic diagram of the shape of the cam portion of Example 1 of the present invention;

[0032] 11 is a diagram of the back plate connection structure of Example 1 of the present invention;

[0033] FIG12 is a schematic diagram of curvature adjustment according to Example 1 of the present invention;

[0034] FIG13 is a schematic diagram of the curvature adjustment of Example 1 of the present invention;

[0035] FIG14 is a diagram of the cover plate and base plate installation structure of Example 1 of the present invention.

[0036] FIG15 is a structural diagram of the height adjustment mechanism of Example 1 of the present invention.

[0037] FIG16 is an exploded view of an adjustable lumbar support according to Modification 1 of the present invention;

[0038] 17 is a diagram of the cover installation structure of the adjustable lumbar support according to Modification 1 of the present invention;

[0039] FIG18 is an exploded view of an adjustable lumbar support according to Example 2 of the present invention;

[0040] FIG19 is a structural diagram of a curvature adjustment mechanism according to Example 2 of the present invention;

[0041] 20 is a schematic structural diagram of a height adjustment mechanism according to embodiment 2 of the present invention;

[0042] FIG21 is a rear angle structural diagram of the adjustable lumbar support according to Example 2 of the present invention;

[0043] FIG22 is a structural diagram of a lumbar support according to Example 3 of the present invention;

[0044] FIG23 is an exploded view of a lumbar support according to Example 3 of the present invention;

[0045] 24 is a structural diagram of a curvature adjustment mechanism according to a second modification of the present invention;

[0046] FIG25 is a structural diagram of a curvature adjustment mechanism in Modification 3 of the present invention;

[0047] FIG26 is an exploded view of the curvature adjustment mechanism in Modification 3 of the present invention;

[0048] FIG27 is a structural diagram of a curvature adjustment mechanism according to Example 4 of the present invention;

[0049] FIG28 is a structural diagram of a curvature adjustment mechanism according to a fourth modification of the present invention;

[0050] FIG29 is a structural diagram of a curvature adjustment mechanism according to a fifth modification of the present invention;

[0051] Figure 30 is a structural diagram of the curvature adjustment mechanism of Example 5 of the present invention.

[0052] Reference numerals: lumbar support 100, 300; insert plate 10; bottom plate 20; mounting groove 21; base plate accommodating portion 22; sliding groove 221; blocking portion 2211; supporting boss 23; reinforcing rib 231; engaging protrusion 24; recessed portion 25; cover plate inserting portion 26; back plate 30; cushion 301; back plate hinge portion 31; rotating shaft 32; load-bearing protrusion 33; sliding protrusion 34; adjusting fitting portion 35; groove fitting protrusion 351; limiting member connecting portion 36; connecting protrusion 361; sliding rod 37; Base plate 40; load-bearing recess 4011; anti-drop hole 401; first hinge protrusion 402; second hinge protrusion 403; protrusion connecting portion 4031; protrusion hinge portion 4032; first hinge assembly 404; hinge plate 4041; hinge buckle 405; buckle connecting portion 4051; buckle hinge portion 4052; guide strip 406; baffle portion 4061; slot 4062; cam mounting hole 407; mounting step 408; blocking protrusion 4081; lever slot 409; lever accommodating portion 41 0; Slider 41; Through slot 411; Slider limiting surface 411A; Hook 412; Slider hinge 413; Block 414; Range limiting member 42; Disc 421; Limiting protrusion 4211; Cam 422, 4222; Cam limiting surfaces 422A, 422B, 422C; Toggle 4223; Connecting hole 4224; Mounting 423; Handle 424; Slider limiting surface 42A; Slider paddles 425, 426; Elastic member 43; Cover 45; First magnetic Magnetic member 451; second magnetic member 452; engaging recess 453; hollow portion 454; accommodating portion 46; accommodating cavity 46A; protrusion 461; protrusion 462; blocks 47, 48; handle 4201; mounting shaft 4001; guide rail 4002; mounting member 4003; side wall 4004; bottom wall 4005; clearance hole 46C; tooth grooves 51, 54; top gear member 52; tooth tip portion 521; lever member 53; paddle 531; lever recess 532; lever deformation beam 55; top gear member 56. DETAILED DESCRIPTION

[0053] The present invention provides a curvature adjustment mechanism and an adjustable lumbar support incorporating the same. The adjustable lumbar support can be installed on a seat or other seating item to support the user's waist. The following description uses an automobile seat as an example. In the following embodiments, descriptions of front-to-back, up-down, and left-to-right directions are based on the user sitting in the automobile seat.

[0054] <Example 1>

[0055] Figure 1 is a three-dimensional view of the adjustable lumbar support according to Example 1 of the present invention from one angle, Figure 2 is a three-dimensional view of the adjustable lumbar support according to Example 1 of the present invention from another angle, Figure 3 is a side view of the adjustable lumbar support according to Example 1 of the present invention, and Figure 4 is an exploded view of the adjustable lumbar support according to Example 1 of the present invention.

[0056] As shown in FIG. 1 to FIG. 4 , this embodiment provides an adjustable lumbar support 100 , which includes an inserting plate 10 , a bottom plate 20 , a backing plate 30 , a curvature adjustment mechanism, and a height adjustment mechanism.

[0057] The inserting plate 10 is used to be inserted between the backrest and the seat surface of the chair when in use, so that the lumbar support 100 can be relatively fixed on the chair.

[0058] The lower end of the base plate 20 is hinged to the front end of the insert plate 10. In this embodiment, the base plate 20 is approximately rectangular as a whole, and its lower end (i.e., the short side portion on the lower side) is rotatably connected to the front end of the insert plate 10 via a hinge structure. Figures 1 to 3 show the form of the insert plate 10 extending backward. In this form, the insert plate 10 can be inserted between the backrest and the seat surface of the chair; when not in use, the insert plate 10 can be rotated and continued to rotate backward to stick it to the rear side, making it convenient for storage. In addition, when the lumbar support 100 is used alone, the insert plate 10 can also be rotated forward to be used as a support foot, so that the lumbar support 100 as a whole can be placed steadily without the need for additional support structures.

[0059] As an alternative, in other embodiments, the lower end of the base plate 20 may also be rotatably connected to the plugboard 10 via other connection structures, or fixedly connected to the plugboard 10, or formed integrally with the plugboard 10.

[0060] The backrest 30 is used to support the user's waist. Its shape has a certain curvature. Specifically, when in use, the middle portion of the backrest 30 arches forward, and the edges on both sides of the middle portion bend forward, thereby conforming to the physiological curve of the human waist. In this embodiment, the backrest 30 is made of a material that can deform to a certain extent and has a certain degree of toughness, such as engineering plastic. As a result, the backrest 30 can support the user's waist and deform when subjected to external forces, thereby changing its curvature. In this embodiment, a soft cushion 301 is also provided on the front side of the backrest 30.

[0061] In embodiment 1 of the present invention, the backrest 30 is installed via a curvature adjustment mechanism, which allows the backrest 30 to change its curvature when subjected to external force (such as the force generated by the user's waist leaning against the backrest 30) and adjusts the range of this change.

[0062] Specifically, the curvature adjustment mechanism includes a base plate 40 , a sliding member 41 , a range limiting member 42 , an elastic member 43 and a cover member 45 .

[0063] FIG5 is an enlarged view of the mounting portion of the upper end of the backing plate of the substrate according to the first embodiment of the present invention.

[0064] As shown in Figures 3 to 5, the upper end of the back plate 30 is rotatably connected to the upper end of the base plate 40 via a hinge mechanism, which includes a first hinge protrusion 402, a second hinge protrusion 403, a first hinge assembly 404 and a second hinge assembly.

[0065] The first hinge protrusion 402 is provided on the rear surface of the upper end of the back plate 30 and is located in the middle position in the left-right direction. The rear surface of the first hinge protrusion 402 is cylindrical and serves as a hinge surface, with its cylindrical centerline extending in the left-right direction.

[0066] There are two second hinge protrusions 403, which are arranged on the upper rear surface of the backrest 30, at both sides in the left-right direction, that is, on both sides of the first hinge protrusion 402. Each of the two second hinge protrusions 403 has two protruding connecting portions 4031 and a protruding hinge portion 4032. The protruding connecting portion 4031 is integrally formed with the backrest 30 and protrudes from the rear surface of the backrest 30. The protruding hinge portion 4032 is approximately cylindrical and has a cylindrical hinge surface. The two ends of the protruding hinge portion 4032 are respectively connected to the protruding connecting portion 4031, and its hinge surface faces diagonally downward to the front. The cylindrical center lines of the hinge surfaces of the two protruding hinge portions 4032 are both collinear with the cylindrical center line of the first hinge protrusion 402. Therefore, the first hinge protrusion 402 and the two second hinge protrusions 403 together form a structure similar to a hinge axis.

[0067] The first hinge assembly 404 includes a plurality of hinge tabs 4041 disposed in the middle of the upper front surface of the base plate 40. The position of each hinge tab 4041 corresponds to the first hinge protrusion 402. The upper front surface of each hinge tab 4041 is a circular arc surface of equal size and collinear center. Each hinge tab 4041 is arranged in parallel, so that these circular arc surfaces are located on the same cylindrical surface. This cylindrical surface matches the shape of the hinge surface of the first hinge protrusion 402, forming a hinge surface. In addition, the lower front surface of each hinge tab 4041 is an inclined straight surface of substantially equal length and substantially the same inclination angle, and these inclined straight surfaces are located on the same inclined surface.

[0068] The second hinge assembly includes two hinge clips 405, located on either side of the upper front surface of the base plate 40, corresponding to the positions of the second hinge protrusions 403. Each hinge clip 405 includes a snap-on connection portion 4051 integrally connected to the base plate 40, and a snap-on hinge portion 4052 located at the end of the snap-on connection portion 4051 facing away from the base plate 40. The rear surface of the snap-on hinge portion 4052 is cylindrical, and its shape matches the hinge surface of the second hinge protrusion 403, forming the hinge surface. Furthermore, the centerline of the cylindrical shapes of the hinge surfaces formed by the first hinge assembly 404 and the hinge surfaces of the two snap-on hinge portions 4052 lie on the same straight line a.

[0069] During installation, the first hinge protrusion 402 is placed on the upper portion of the first hinge assembly 404, so that the hinge surface of the first hinge protrusion 402 contacts the upper arc surface of each hinge piece 4041 of the first hinge assembly 404, forming a hinge structure similar to a hinge shaft connection; then, the second hinge protrusions 403 are respectively engaged with the hinge buckles 405, so that the two second hinge protrusions 403 and the hinge buckles 405 form a hinge structure. Because the cylindrical shapes of the hinge surfaces of the first hinge protrusion 402 and the second hinge protrusion 403 are collinear, and the hinge surfaces of the first hinge assembly 404 and the second hinge assembly are collinear, the aforementioned two hinge structures are equivalent to being coaxial (i.e., the axes are both on line a), forming a structure similar to a hinge shaft. Since the first hinge assembly 404 supports the first hinge protrusion 402 from the rear side and the second hinge assembly buckles the second hinge protrusion 403 from the front side, the hinge structure between the back plate 30 and the base plate 40 is relatively firm and not easy to loosen; when disassembling, it is only necessary to pull the hinge buckle 405 to loosen the second hinge protrusion 403 to remove the back plate 30 from the base plate 40. Therefore, no additional connecting parts such as bolts are required, and disassembly and assembly are convenient.

[0070] In the above manner, the upper rear part of the backrest 30 is connected to the front part of the base plate 40, and the upper end of the backrest 30 has a certain degree of rotatability relative to the base plate 40, so that when the backrest 30 is deformed and the angle of the upper rear part thereof changes relative to the base plate 40, the rear part can adaptively rotate slightly so as not to be pulled, thereby avoiding material fatigue damage.

[0071] Figure 6 is a structural diagram of the sliding part of embodiment 1 of the present invention, Figure 7 is a partial exploded diagram of the sliding part and range limiting part installation structure of the substrate of embodiment 1 of the present invention, and Figure 8 is a partial structural diagram of the range limiting part installation part of the substrate of embodiment 1 of the present invention.

[0072] As shown in Figures 4 and 6-8, the slider 41 is in the shape of a substantially rectangular plate, and the base plate 40 is provided with guide bars 406 corresponding to the left and right sides of the slider 41. The guide bars 406 are parallel to each other and extend along the length of the base plate 40. The slider 41 is disposed between the two guide bars 406 and can slide relative to the base plate 40 under the guidance of the guide bars 406.

[0073] In addition, the sliding member 41 has a through slot 411 in the middle, a hook 412 on the rear side of the upper portion, and a sliding member hinge portion 413 at the lower portion.

[0074] The base plate 40 has a generally circular cam mounting hole 407 located between the two guide bars 406. A slightly larger mounting step 408 is formed around the edge of the cam mounting hole 407. The base plate 40 also has a supporting boss 23 located at the lower edge of the cam mounting hole 407. The upper surface of the supporting boss 23 is arc-shaped, with the center of the arc coinciding with the center of the cam mounting hole 407. In this embodiment, the supporting boss 23 also has a plurality of downwardly extending reinforcing ribs 231.

[0075] FIG. 9 is a structural diagram of a range limiting member according to embodiment 1 of the present invention.

[0076] As shown in Figures 2, 7 and 9, the range limiter 42 is a cam having a circular disc portion 421, a cam portion 422 provided on the front surface of the disc portion 421 and a mounting portion 423 provided on the rear surface of the disc portion 421.

[0077] The mounting portion 423 is in the shape of a circular boss, and its shape and size match the cam mounting hole 407, and can be movably embedded in the cam mounting hole 407; the outer edge size of the disc portion 421 is slightly larger than the cam mounting hole 407, and the outer edge size matches the inner edge of the mounting step 408, and is accommodated in the mounting step 408.

[0078] As shown in FIG2 , the rear portion of the mounting portion 423 is exposed from the rear side of the base plate 40 via the cam mounting hole 407 . A handle portion 424 is provided on the rear portion. When in use, the user can twist the handle portion 424 to rotate the range limiter 42 as a whole.

[0079] FIG10 is a schematic diagram showing the shape of the cam portion of Example 1 of the present invention.

[0080] As shown in FIG9 and FIG10 , the cam portion 422 is in the shape of a circular boss having a diameter larger than that of the disc portion 421 , and its upper outer surface includes three cam limiting surfaces, all of which are planar surfaces.

[0081] As shown in FIG10 , the three cam limiting surfaces appear as three straight lines connected end to end when viewed from the front of the cam portion 422 , that is, the three cam limiting surfaces are connected in sequence and are all approximately perpendicular to the radial direction of the cam portion 422 .

[0082] The three cam limiting surfaces are sequentially designated as 422A, 422B, and 422C. The distances between the cam limiting surfaces 422A, 422B, and 422C and the center of the cam portion 422 increase in sequence. The shape and size of the upper surface of the supporting boss 23 match the lower portion of the cam portion 422, and the lower portion of the cam portion 422 abuts against the upper surface of the supporting boss 23, thereby being supported by the supporting boss 23.

[0083] As shown in FIG. 4 and FIG. 6 , the through-groove 411 is approximately rectangular. When the sliding member 41 is installed between the guide bars 406 , the cam portion 422 and the supporting boss 23 are exactly located in the through-groove 411 .

[0084] The upper inner surface of the through-slot 411 faces the cam portion 422 and serves as the slider-limiting surface 411A. The slider-limiting surface 411A is a flat surface that, when the slider 41 is installed, is perpendicular to the radial direction of the cam portion 422. Thus, when the user rotates the range limiter 42 by turning the handle 424, the cam-limiting surface 422A, 422B, or 422C can face and abut the slider-limiting surface 411A.

[0085] Furthermore, when the slider 41 slides upward, the reinforcing rib 231 can act as a stopper to abut against the lower surface of the through-groove 411. In other words, the stopper provided by the reinforcing rib 231 can limit the upper end point of the slidable range of the slider 41. Alternatively, a stopper can be provided at the upper side of the slider 41 to abut against the upper outer surface of the slider 41, or the lower surface of the baffle portion 4061 can be used to abut against the upper outer surface of the slider 41, thereby limiting the upper end point of the slidable range of the slider 41.

[0086] A limiting protrusion 4211 is provided on the upper portion of the disc portion 421. A blocking protrusion 4081 is provided on each inner edge of the mounting step 408 to engage with the limiting protrusion 4211. When the user rotates the handle portion 424 clockwise or counterclockwise to rotate the range limiter 42, one or the other of the blocking protrusions 4081 will abut against the limiting protrusion 4211, thereby limiting the rotational travel of the range limiter 42. In this embodiment, the endpoints of the rotational travel of the range limiter 42 in both directions are the positions where the cam limiting surface 422A and the slider limiting surface 411A are opposite, and the positions where the cam limiting surface 422C and the slider limiting surface 411A are opposite, respectively.

[0087] As shown in Figures 4 and 6, in this embodiment, the elastic member 43 is a spring wire. As shown in Figure 8, the lower ends of the two guide bars 406 each have a slot 4062. The ends of the elastic member 43 engage within the slots 4062, securing the ends of the elastic member 43 to the lower ends of the two guide bars 406. The hook portion 412 has a downward opening and hooks onto the middle portion of the elastic member 43. This allows the elastic member 43 to apply a force to the slider 41 toward the baffle portion 4061 (equivalently, upward) through the hook portion 412. Alternatively, the elastic member 43 can be another type of spring-like component, such as a tension spring or a compression spring, one end of which is connected to the slider 41 and the other end to the base plate 40. The spring constantly pulls or presses against the slider 41, thereby applying a force to the slider 41 toward the baffle portion 4061.

[0088] FIG11 is a structural diagram of the support plate connection according to embodiment 1 of the present invention.

[0089] As shown in Figure 11, a backrest hinge portion 31 is provided at the lower rear end portion of the backrest 30, which is recessed in the middle and has horizontally extending connecting holes at both ends. A rotating shaft 32 is provided in the sliding member hinge portion 413, and both ends of the rotating shaft 32 are respectively inserted into the connecting holes at both ends of the backrest hinge portion 31, so that the lower end of the backrest 30 is hinged to the lower end of the sliding member 41.

[0090] FIG12 is a schematic diagram of curvature adjustment according to Example 1 of the present invention, and FIG13 is a schematic diagram of the principle of curvature adjustment according to Example 1 of the present invention.

[0091] As shown in Figure 12, the upper end of the back plate 30 is hinged to the upper end of the base plate 40 through a hinge mechanism, and the lower end is hinged to the lower end of the slide 41 through the cooperation of the back plate hinge part 31, the rotating shaft 32 and the sliding part hinge part 413. When the slide 41 slides up and down relative to the base plate 40, the distance L between the lower end of the back plate 30 and the upper end can be changed.

[0092] Furthermore, because the elastic member 43 exerts an upward force on the slider 41 via the hook portion 412, when no external force is applied, the slider 41 is typically located in contact with the reinforcing rib 231, i.e., in an upward position (hereinafter referred to as the initial position of the slider 41). At this point, the distance L is at its shortest. When subjected to an external force, such as a user's waist leaning against the backrest 30, exerting a backward force on the backrest 30, this force pushes the arched portion of the middle portion of the backrest 30 backward, causing the backrest 30 to stretch. The lower end of the backrest 30 then drives the slider 41 downward, overcoming the upward force of the elastic member 43 and causing the distance L to increase. Because the backrest 30 is deformable, increasing the distance L decreases the curvature of the backrest 30; conversely, the curvature increases.

[0093] As shown in Figures 12 and 13, the user can rotate the handle 424 to rotate the range limiter 42, so that one of the cam limiter surfaces 422A, 422B, and 422C faces the slider limiter surface 411A. It can be seen that when the slider 41 slides downward, if the slider limiter surface 411A contacts one of the cam limiter surfaces 422A, 422B, and 422C, the slider 41 will not be able to slide further downward and will be limited.

[0094] As shown in Figure 13, when the cam limit surface 422A is facing the sliding member limit surface 411A, the center position of the cam portion 422 will not change due to the supporting effect of the supporting boss 23 on the cam portion 422. Therefore, when the cam limit surface 422A is facing the sliding member limit surface 411A, the limit position of the sliding member 41's downward movement corresponds to the position where the sliding member limit surface 411A abuts the cam limit surface 422A; since the distance between the cam limit surface 422A and the center of the cam portion 422 is the shortest, and its distance relative to the sliding member limit surface 411A in the initial position is the longest, the range D1 in which the sliding member 41 can slide down is the longest in this case.

[0095] Similarly, when the cam limit surface 422C is facing the sliding member limit surface 411A, since the distance between the cam limit surface 422C and the center of the cam portion 422 is the longest, the distance to the sliding member limit surface 411A in its initial position is the shortest. In this case, the range D3 in which the sliding member 41 can slide down is the shortest; when the cam limit surface 422B is facing the sliding member limit surface 411A, since the distance between the cam limit surface 422B and the center of the cam portion 422 is between the cam limit surfaces 422A and 422C, the range D2 in which the sliding member 41 can slide down is also between D1 and D3.

[0096] As described above, when the user rotates the handle 424, the sliding range of the slider 41 can be changed to D1, D2, or D3. Accordingly, the lower end of the backboard 30 slides with the slider 41, and its sliding range also changes between D1, D2, or D3. Let's denote the distance between the lower end of the backboard 30 and the upper end when no external force is applied as L0. When the sliding range is D1, once the backboard 30 is subjected to external force, the distance L can vary between L0 and L0+D1. Similarly, when the sliding range is D2, the distance L can vary between L0 and L0+D2, and when the sliding range is D3, the distance L can vary between L0 and L0+D3. By changing the sliding range between the slider 41 and the lower end of the backboard 30, the user can change the range of the distance L between the upper and lower ends of the backboard 30, thereby correspondingly changing the range of the curvature of the backboard 30.

[0097] That is to say, the curvature adjustment mechanism of this embodiment not only allows the curvature of the backrest 30 to change to match the user's waist curvature and improve usage comfort, but also can change the variable range of the curvature so that the user can choose different curvature variable ranges according to actual usage experience, thereby further improving usage comfort.

[0098] FIG14 is a diagram of the cover plate and base plate installation structure of Example 1 of the present invention.

[0099] As shown in Figures 4 and 14, the cover 45 covers the slider 41, the range limiter 42, and other components, preventing the slider 41 and the range limiter 42 from loosening forward while not affecting the upward and downward movement of the slider 41 or the rotation of the range limiter 42. The cover 45 is provided with three first magnetic members 451 arranged circumferentially. The cam portion 422 is provided with a second magnetic member 452. The second magnetic member 452 and the first magnetic member 451 are mutually attracted to each other and can be moved circumferentially by the rotation of the cam portion 422 driven by the handle portion 424, thereby sequentially aligning with and attracting one of the three first magnetic members 451. The three first magnetic members 451 are positioned so that when the second magnetic member 452 is rotated to align with the three first magnetic members 451, one of the cam limiter surfaces 422A, 422B, and 422C is aligned with the slider limiter surface 411A. Therefore, when the user rotates the handle part 424, the attraction between the second magnetic part 452 and the first magnetic part 451 can ensure that one of the cam limiting surfaces 422A, 422B, and 422C is aligned with the sliding part limiting surface 411A, thereby avoiding the problem that the part between the cam limiting surfaces cannot be aligned with the sliding part limiting surface 411A.

[0100] In this embodiment, both side edges of the bottom plate 20 are provided with mounting grooves 21 opening inwards, and both side edges of the base plate 40 are respectively engaged in the mounting grooves 21 , so that the bottom plate 20 and the base plate 40 are slidably combined.

[0101] FIG15 is a structural diagram of the height adjustment mechanism of Example 1 of the present invention.

[0102] As shown in FIG. 4 , FIG. 7 and FIG. 15 , a height adjustment mechanism is further provided between the bottom plate 20 and the base plate 40 . The height adjustment mechanism includes a tooth groove 51 , a top tooth member 52 and a lever member 53 .

[0103] There are two tooth grooves 51 . The two tooth grooves 51 are arranged parallel to each other on the rear side of the bottom plate 20 , extend substantially in the up-down direction, and are formed integrally with the bottom plate 20 .

[0104] A transversely extending receiving slot 4061 is defined in the middle of the base plate 40. Two top teeth 52 are positioned within the receiving slot 4061. Each of the two top teeth 52 has a tooth tip 521 at its outer end. Two tooth grooves 51 are located on either side of the receiving slot 4061, each facing a tooth tip 521. The recessed shape of each tooth groove 51 matches the shape of the corresponding tooth tip 521.

[0105] In addition, a through hole is provided on the top tooth part 52, and a spring is provided in the hole. One end of the spring is fixed on the base plate 40, and the other end is in contact with the top tooth part 52, providing a tendency force toward the top tooth part 52 in the outward direction (i.e., in the direction away from the longitudinal center line of the base plate 40).

[0106] The upper portion of the base plate 40 also includes a lever slot 409 and a lever accommodating portion 410. The lower end of the lever slot 409 communicates with the accommodating portion 4061. The lever accommodating portion 410 is located at the upper end of the lever slot 409 and comprises a downwardly opening cavity. The lever member 53 is entirely located within the lever slot 409, with its upper end extending into the lever accommodating portion 410. Furthermore, as shown in Figure 14, the upper end of the cover plate 45 also extends into the lever accommodating portion 410, while its lower end engages with the lower front surface of the base plate 40 via a snap-fitting slot. Simultaneously, the bottom plate 20 covers the upper half of the base plate 45 from the front, further preventing the cover plate 45 from detaching from the base plate 40.

[0107] As shown in FIG2 , a through slot is formed at the lever accommodating portion 410 of the base plate 40, exposing the upper rear surface of the lever member 53 from the rear side of the base plate 40. A paddle 531 is provided on the upper rear surface of the lever member 53. The user can move the paddle 531 up and down by pulling it.

[0108] As shown in Figures 12 and 14 , the lower end of the lever 53 extends into the receiving groove 4061 and is located between the two top teeth 52. This lower end has a certain width, and its two side edges can respectively abut the inner ends of the two top teeth 52, preventing the top teeth 52 from moving inward. In this state, the outer ends of the top teeth 52 are positioned further outward, and the tooth tips 521 are precisely located in a recess in the tooth groove 51, interlocking with the tooth groove 51, preventing vertical displacement between the bottom plate 20 and the base plate 40.

[0109] In this embodiment, a magnetic member is provided on each of the lever member 53 and the cover member 45. These two magnetic members can attract each other, so that the lower end of the lever member 53 always abuts the inner ends of the two top teeth 52 when no external force is applied. Alternatively, in other embodiments, a spring can be provided within the lever member 53 to reset the lever member 53 using the spring force, so that the lower end always abuts the inner ends of the two top teeth 52 when no external force is applied.

[0110] The lever 53 has a lever recess 532 on each side of its upper portion relative to the lower end. Both upper and lower side surfaces of the lever recess 532 are inclined surfaces. Furthermore, both sides of the lower end surface of the lever 53 are also inclined surfaces, as are the upper and lower side surfaces of the inner end of the top gear 52. When the lever 53 moves downward so that the lever recess 532 reaches the top gear 52, or when the lever 53 moves upward so that the top gear 52 reaches the inclined portion of the lower end surface of the lever 53, the lever 53 no longer abuts the inner portion of the top gear 52, thereby no longer supporting the top gear 52. At this point, the user can drag the base plate 40 up and down, causing the top gear 52 to shift vertically with the tooth groove 51. Under the abutment of the pointed teeth of the tooth groove 51, the top gear 52 overcomes the spring force and retracts, allowing the base plate 40 and the bottom plate 20 to move vertically. After moving to the appropriate up and down position, when the user releases the shifting piece 531, the shifting rod 53 returns to its original position, and the shifting rod recess 532 no longer faces the top gear 52. At this time, even if the user drags the base plate 40 up and down, the top gear 52 cannot retract due to the abutment of the lower end of the shifting rod 53. Accordingly, the base plate 40 and the bottom plate 20 can no longer move up and down.

[0111] Therefore, the user can move the lever 53 downward or upward by toggling the paddle 531, so that the bottom plate 20 and the base plate 40 can be displaced up and down relative to each other. At this time, the base plate 40 can be dragged to change the up and down position of the base plate 40 relative to the bottom plate 20, thereby changing the up and down position of the back plate 30 relative to the plug-in board 10, thereby completing the height change of the back plate 30.

[0112] Functions and Effects of the Embodiments

[0113] In the curvature adjustment mechanism and adjustable lumbar support of this embodiment, the supporting boss limits the position of one end point of the sliding range of the slider, and the range limiting member limits the position of the other end point of the sliding range of the slider by abutting the cam limiting surface with the limiting surface of the slider. Therefore, the slider can slide between the two end points, so that one end (i.e., the lower end) of the backrest plate is slidable relative to the base plate within a certain range. When the user's waist leans against the backrest plate, the waist will exert a certain force on the backrest plate. This mobility of the lower end of the backrest plate allows the backrest plate to deform to a certain extent in response to the waist force, so that the curvature of the backrest plate can change in real time with the user's waist curve, thereby better fitting the user's waist curve.

[0114] Moreover, the mobility of the lower end of the backrest also allows the backrest to have a certain range of deformation, which can cushion the user's waist in the event of external force impact, such as bumpy driving.

[0115] Furthermore, since the cam limit surface can cooperate and abut against different sliding member limit surfaces, the other end point position of the sliding range of the sliding member is restricted differently, that is, the lower end of the sliding member and the back plate are restricted to different sliding ranges. Therefore, the user can adjust the sliding range of the sliding member to be larger or smaller according to his or her own usage needs, thereby improving the usage experience.

[0116] <Variation 1>

[0117] This modification is a modification of Example 1. In this modification, the same components as those in Example 1 are denoted by the same reference numerals, and the same descriptions are omitted.

[0118] FIG16 is an exploded view of the adjustable lumbar support according to the first modification of the present invention, and FIG17 is a schematic diagram of the cover plate installation structure of the adjustable lumbar support according to the first modification of the present invention.

[0119] As shown in FIG. 16 and FIG. 17 , the adjustable lumbar support 200 of this modified example includes an inserting plate 10 , a backrest plate 30 , and a curvature adjustment mechanism. However, compared to the first embodiment, the adjustable lumbar support 200 does not have a height adjustment mechanism.

[0120] Specifically, in the curvature adjustment mechanism of this modified example, the bottom plate 20 and the base plate 40 are formed integrally, that is, the lower end of the base plate 40 is directly connected to the plugboard 10 , and the base plate 40 cannot slide relative to the bottom plate 20 .

[0121] In this variation, the base plate 40 is provided with a cover insert 26 positioned above the cam mounting hole 407. A locking protrusion 24 is also provided below the supporting boss 23. The lower rear surface of the cover 45 also has a locking recess 453 that matches the locking protrusion 24. During installation, the upper end of the cover 45 extends into the cover insert 26, and the middle portion engages with the base plate 40 by engaging the locking protrusion 24 into the locking recess 453. A recess 25 is formed on the lower front surface of the base plate 40, matching the shape of the lower half of the cover 45. Once the cover 45 is installed, its lower half mates with the recess 25, thereby securing the cover 45.

[0122] In this variation, a hollow portion 454 is provided on the cover 45 in Example 1, and the back plate hinge portion 31 at the lower end of the back plate 30 passes through the hollow portion 454 and is then connected to the rotating shaft 32.

[0123] The adjustable lumbar support 200 of this variation does not have a height adjustment mechanism, and the base plate 40 is integrally formed with the bottom plate 20. The height of the base plate 40 relative to the insert plate 10 cannot be changed, meaning that height adjustment is not possible. However, since the curvature adjustment mechanism, with the exception of the adaptively modified mounting structure of the cover 45, is identical to that of Example 1, it can achieve the same curvature adjustment range as Example 1 and achieve the same corresponding performance. Furthermore, since the cover 45 of this variation is installed by inserting the upper end and snapping the lower end together, screws and other mounting components are not required, achieving screwless installation of the entire adjustable lumbar support.

[0124] <Example 2>

[0125] In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the same descriptions are omitted.

[0126] FIG18 is an exploded view of the adjustable lumbar support according to embodiment 2 of the present invention.

[0127] As shown in FIG18 , the adjustable lumbar support 300 of this embodiment includes an inserting plate 10 , a bottom plate 20 , a backing plate 30 , a curvature adjustment mechanism, and a height adjustment mechanism.

[0128] The curvature adjustment mechanism includes a base plate 40 , a sliding member 41 , and a range limiting member 42 , and the height adjustment mechanism includes a tooth groove 54 , a lever deformation beam 55 , a top gear member 56 , and a lever member 53 .

[0129] FIG19 is a structural diagram of the curvature adjustment mechanism of Example 2 of the present invention.

[0130] As shown in FIG. 19 , in this embodiment, the range limiting member 42 is also a limit cam, and the structure of the limit cam is different from that of the first embodiment.

[0131] Specifically, the range limiting member 42 of this embodiment is a cam member having a cam portion 4222 and a toggle portion 4223 .

[0132] The cam portion 4222 is rotatably mounted on the lower front surface of the base plate 40 via a mounting shaft 4001. Similar to Example 1, the upper side of the cam portion 4222 also has three cam limiting surfaces at different distances from the center of the circle. The difference from Example 1 is that a toggle portion 4223 is further provided on the lower side of the cam portion 4222. The toggle portion 4223 is in the shape of a sheet and protrudes outward from the lower surface of the cam portion 4222.

[0133] The slider 41 of this embodiment is approximately plate-shaped, with a receiving portion 46 disposed at its lower portion. A receiving cavity 46A is formed at the rear of the receiving portion 46, which is larger than the cam portion 4222. The inner upper surface of the receiving cavity 46A is flat, serving as a slider limit surface 46B that abuts the cam limit surface of the cam portion 4222, thereby limiting the downward movement of the slider 41. Furthermore, the lower portion of the receiving portion 46 is hollowed out, exposing the toggle portion 4223 from its lower side.

[0134] In this embodiment, the upper end of the back plate 30 is hinged to the upper end of the base plate 40 by a hinge mechanism, which is different from that of Example 1. Specifically, the upper end of the back plate 30 is provided with a load-bearing protrusion 33 extending toward the rear side and an anti-slip hook portion (not shown in the figure) provided in the middle of the load-bearing protrusion 33, and the front side of the upper end of the base plate 40 is provided with a load-bearing recess 4011 corresponding to the load-bearing protrusion 33 and an anti-slip hole 401 corresponding to the anti-slip hook portion. The load-bearing protrusion 33 extends obliquely toward the rear and upward, and the load-bearing recess 4011 is in a concave shape that basically matches the shape of the load-bearing protrusion 33. The anti-slip hole 401 and the anti-slip hook portion both extend approximately horizontally. During installation, the load-bearing protrusion 33 is embedded in the load-bearing recess 4011, and the anti-slip hook portion is inserted into the anti-slip hole 401, thereby completing the hinge connection between the back plate 30 and the upper end of the base plate 40.

[0135] A sliding member hinge portion 413 is provided on the front side of the accommodating portion 46, and the lower end of the back plate 30 is hinged to the lower end of the sliding member 41 through the cooperation of the rotating shaft 32 (not shown in the figure), the back plate hinge portion 31 and the sliding member hinge portion 413. The specific cooperation and hinge method of the three is the same as that in Example 1 and will not be repeated here.

[0136] The curvature adjustment in this embodiment adjusts the curvature's variable range, and its adjustment principle is similar to that of Example 1. Specifically, because the lower end of the support plate 30 is hinged to the accommodating portion 46, when the slider 41 moves up and down, the lower end of the support plate 30 can follow the movement. In this embodiment, there is no limit member for the upper limit position of the slider 41, nor is there a member that provides an upward force like the elastic member 43 of Example 1. However, because the support plate 30 itself has a certain curvature, the position of the lower end of the support plate 30 is the uppermost position of its travel range when no external force is applied. When subjected to external force, the back plate 30 is deformed and its lower end moves downward, driving the sliding member 41 to move downward. When the sliding member limiting surface 46B abuts against one of the cam limiting surfaces of the cam portion 4222, it stops moving downward. By turning the toggle portion 4223 to rotate the cam portion 4222, different cam limiting surfaces can be directed toward the sliding member limiting surface 46B, thereby changing the sliding range of the sliding member 41 and the lower end of the back plate 30, and then correspondingly changing the variable range of the curvature of the back plate 30.

[0137] Figure 20 is a schematic diagram of the height adjustment mechanism of Example 2 of the present invention, and Figure 21 is a rear angle structural diagram of the adjustable lumbar support of Example 2 of the present invention. In Figure 20, part of the structure of the base plate receiving portion is omitted to clearly illustrate the internal structure.

[0138] As shown in Figures 20 and 21, in this embodiment, a substrate receiving portion 22 is provided on the front side of the bottom plate 20, and the substrate 40 is slidably disposed in the substrate receiving portion 22. In addition, a hollow portion is provided on the front side of the substrate receiving portion 22 so that the receiving portion 46 of the sliding member 41 can be exposed.

[0139] As shown in Figures 20-21, the lever 53 is positioned on the upper front portion of the base plate 40. Due to the abutment of the base plate receiving portion 22, the lever 53 will not detach from the base plate 40. A horizontally extending lever deformable beam 55 is fixedly connected to the lower end of the lever 53. This beam 55 has a certain degree of elasticity and is equipped with a top tooth 56 at each end, with the two top teeth 56 protruding from either side of the base plate 40. Two opposing tooth grooves 54 are provided on the inner surfaces of the base plate receiving portion 22. In the absence of external forces, the top teeth 56 engage with the tooth grooves 54 on their corresponding sides.

[0140] In this embodiment, similar to Example 1, the tab 531 of the lever 53 is also exposed from the rear side of the base plate 20. When the user pulls the tab 531, the lever 53 is pressed downward or pulled upward, causing the middle portion of the lever deformation beam 55 to move downward or upward, thereby deforming. This deformation of the lever deformation beam 55 causes the two top teeth 56 to move toward each other, thereby disengaging from the tooth groove 54. The user can then drag the base plate 20 or base plate 40 to cause them to move relative to each other, thereby changing the height of the base plate 40 and the back plate 30.

[0141] <Example 3>

[0142] This embodiment is a variation of embodiment 2, and provides another implementation of the curvature adjustment mechanism. In this embodiment, the same symbols are given to the same structures as those in embodiment 2, and the same descriptions are omitted.

[0143] FIG22 is a structural diagram of a lumbar support according to a third embodiment of the present invention, and FIG23 is an exploded diagram of the lumbar support according to the third embodiment of the present invention.

[0144] As shown in Figures 22 and 23, compared with Example 2, the curvature adjustment mechanism of this embodiment does not have a sliding member 41.

[0145] Specifically, in this embodiment, a roughly rectangular sliding groove 221 is provided on the lower side of the substrate accommodating portion 22, and a sliding protrusion 34 is provided on each side of the lower end of the support plate 30, which is respectively embedded in the left and right side walls of the sliding groove 221, so that the lower end of the support plate 30 can slide up and down in the sliding groove 221.

[0146] The structure of the range limiting member 42 of this embodiment is the same as that of Example 2. The range limiting member 42 is rotatably mounted on the lower front surface of the base plate 40, positioned within the sliding groove 221. When a user moves the cam portion 4222 via the toggle portion 4223, different cam limiting surfaces are directed toward the lower end of the back plate 30, thereby limiting the lower end of the back plate 30 to different sliding ranges, thereby correspondingly changing the range of curvature of the back plate 30.

[0147] Compared with Example 2, in this embodiment, since the lower end of the back plate 30 is directly sliding in the sliding groove 221 and the different cam limit surfaces of the cam portion 4222 are directly used to limit the lower end of the back plate 30, there is no need to set a sliding member 41, and the structure is simpler, but it can also achieve changes in the sliding range of the lower end of the back plate 30 and the corresponding changeable range of the curvature of the back plate 30.

[0148] <Variation 2>

[0149] This modification is a modification of Example 3, and differs from Example 3 mainly in that the height adjustment mechanism is not present. In this modification, the same reference numerals are given to the same structures as in Example 3, and the same descriptions are omitted.

[0150] FIG24 is a structural diagram of the curvature adjustment mechanism of Modification 2 of the present invention, in which the inserting plate 10 is omitted.

[0151] As shown in Figure 24, in modification example 2, the base plate 40 is formed integrally with the bottom plate 20, and the sliding groove 221 is directly formed on the front surface of the base plate 40; the two sides of the lower end of the support plate 30 have sliding protrusions 34 that are the same as those in embodiment 3, and the two sliding protrusions 34 are respectively embedded in the two side walls of the sliding groove 221, so that the lower end of the support plate 30 can slide up and down in the sliding groove 221, that is, the lower end of the support plate 30 is slidably set on the base plate 40.

[0152] In addition, a blocking portion 2211 is provided at the upper end of the sliding groove 221 for blocking the lower end of the backing plate 30 to prevent the lower end of the backing plate 30 from falling out from above the sliding groove 221 .

[0153] In this modified example, since there is no height adjustment mechanism, the height of the backrest 30 cannot be adjusted, but its curvature adjustment mechanism is basically the same as that of the embodiment 3, and the adjustment of the curvature variation range can be achieved in the same manner.

[0154] <Variation 3>

[0155] This variation is a further variation of Example 3 based on Variation 2. It differs from Variation 2 in the mounting position of the range limiter. In this variation, identical components to those in Example 3 and Variation 2 are designated with identical reference numerals, and identical descriptions are omitted.

[0156] Figure 25 is a structural diagram of the curvature adjustment mechanism in Modification 3 of the present invention, and Figure 26 is an exploded view of the curvature adjustment mechanism in Modification 3 of the present invention. The inserting plate 10 is omitted in both Figures 25 and 26 .

[0157] As shown in Figures 25 and 26, the base plate 40 is integrally formed with the bottom plate 20, and the sliding groove 221 is formed directly on the front surface of the base plate 40. A sliding protrusion 34 is provided on either side of the lower end of the support plate 30. These two sliding protrusions 34 are respectively embedded in the side walls of the sliding groove 221, allowing the lower end of the support plate 30 to slide up and down within the sliding groove 221. Furthermore, a blocking portion 2211 is provided at the upper end of the sliding groove 221 to block the lower end of the support plate 30 and prevent it from slipping out of the upper portion of the sliding groove 221.

[0158] Compared with the second modification, the range limiter 42 of this modification is not mounted on the base plate 40 but is connected to the back plate 30 .

[0159] Specifically, a cylindrical limiting member connecting portion 36 is provided at the rear of the lower end of the support plate 30. The range limiting member 42 includes a cam portion 4222, with a connecting hole 4224 defined at the center thereof. The limiting member connecting portion 36 engages within the connecting hole 4224, allowing the range limiting member 42 to be rotatably connected to the lower end of the support plate 30. A shifting post 4225 is provided at the front of the cam portion 4222. By shifting the shifting post 4225 from the front, the range limiting member 42 can be rotated on the lower end of the support plate 30.

[0160] A stopper 47 is provided below the sliding groove 221 on the base plate 40. When a user activates the lever 4225 to rotate the cam portion 4222, causing different cam-limiting surfaces of the cam portion 4222 to face the stopper 47, the abutment between the different cam-limiting surfaces and the stopper 47 changes the slidable range of the range limiter 42 and the lower end of the support plate 30, thereby correspondingly changing the range of curvature of the support plate 30.

[0161] Compared with the second modification, in this modification, the range limiting member 42 is connected to the lower end of the back plate 30 instead of the base plate 40, but it can also achieve the change of the variable range of the curvature.

[0162] <Example 4>

[0163] This embodiment is another variation of embodiment 2, and provides another implementation of the curvature adjustment mechanism. In this embodiment, the same symbols are given to the same structures as those in embodiment 2, and the same descriptions are omitted.

[0164] Figure 27 is a structural diagram of the curvature adjustment mechanism of Example 4 of the present invention.

[0165] As shown in Figure 27, in this embodiment, the range limiting member 42 is a slider. A horizontally extending strip guide rail 4002 is provided on the base plate 40, and a horizontally extending groove is provided on the rear side of the range limiting member 42 and is embedded in the guide rail 4002, allowing the range limiting member 42 to slide left and right.

[0166] The upper surface of the range limiting member 42 has multiple horizontal surfaces (three in this embodiment) that serve as slider-limiting surfaces 42A. From left to right, the distances between these horizontal surfaces and the lower edge of the base plate 40 decrease, and the slider-limiting surfaces 42A are sequentially connected, forming a stepped pattern. A slider paddle 425 is provided at the lower portion of the range limiting member 42. This paddle 425 extends downward and protrudes beyond the lower edge of the base plate 40.

[0167] In this embodiment, the accommodating portion 46 further includes a protrusion 461 located in the middle of the upper portion of the accommodating cavity 46A. The width of the protrusion 461 is less than or equal to the horizontal length of the slider limiting surface 42A. When subjected to an external force, the support plate 30 deforms, causing its lower end to move downward, driving the slider 41 downward. When the protrusion 461 abuts one of the slider limiting surfaces 42A, the slider 41 stops moving downward. By moving the slider paddle 425 to slide the range limiting member 42 left and right, different slider limiting surfaces 42A can be aligned with the protrusion 461. This allows the different slider limiting surfaces 42A to abut against the protrusion 461, thereby changing the slidable range of the slider 41 and the lower end of the support plate 30, and thus correspondingly changing the range of curvature of the support plate 30.

[0168] <Variation 4>

[0169] This modification is a modification of Example 4, and differs from Example 4 in that it does not have a height adjustment mechanism. In this modification, the same reference numerals are given to the same structures as in Example 4, and the same descriptions are omitted.

[0170] FIG28 is a structural diagram of the curvature adjustment mechanism of variant example 4 of the present invention.

[0171] As shown in Figure 28 , in this variation, the base plate 40 is integrally formed with the bottom plate 20, with its lower end directly connected to the front end of the plugboard 10. A sliding groove 221 is formed on the lower front surface of the base plate 40, located above the range limiter 42. The structure of the sliding groove 221 is identical to that of the sliding groove 221 in Variation 2, and a stopper 2211 is also provided at its upper end.

[0172] The lower end of the back plate 30 is provided with an adjustment engagement portion 35, which is positioned to correspond to the three slider stop surfaces 42A. Furthermore, groove-engaging protrusions 351 for engaging with the sliding grooves 221 are provided on the lower end of the back plate 30, on either side of the adjustment engagement portion 35. This allows the lower end of the back plate 30 to slide within the sliding grooves 221, but upward movement is blocked by the blocking portions 2211, preventing it from dislodging from above the sliding grooves 221. In other words, in this modified example, the lower end of the back plate 30 is slidably mounted on the base plate 40.

[0173] When the range limiter 42 slides left and right by toggling the slider paddle 425, one of the three slider limiting surfaces 42A will be aligned with the adjustment fitting portion 35 in the longitudinal direction, so that when the lower end of the backrest 30 slides downward, the lower end of the backrest 30 can be limited by the abutment between one of the slider limiting surfaces 42A and the adjustment fitting portion 35, thereby limiting the sliding distance range of the lower end of the backrest 30.

[0174] Compared with Example 4, this variation does not have a height adjustment mechanism, but can also achieve adjustment of the curvature variation range.

[0175] <Variation 5>

[0176] This modification is another modification of Example 4 based on Modification 4, and differs from Modification 4 in that it does not have the mounting position of the range limiter 42. In this modification, the same reference numerals are given to the same structures as in Example 4 and Modification 4, and the same descriptions are omitted.

[0177] FIG29 is a structural diagram of the curvature adjustment mechanism of variant example 5 of the present invention.

[0178] As shown in Figure 29, in this variation, base plate 40 is integrally formed with bottom plate 20, with its lower end directly connected to the front end of plugboard 10. A sliding groove 221 is provided on the front lower surface of base plate 40, with the same structure as sliding groove 221 in variation 2, and a stopper 2211 is also provided at the upper end.

[0179] A groove engaging protrusion (not shown) is provided on each side of the lower end of the back plate 30. The two groove engaging protrusions are respectively embedded in the two side portions of the sliding groove 221, so that the lower end of the back plate 30 can slide up and down relative to the base plate 40.

[0180] The lower end of the support plate 30 is also equipped with a sliding rod 37 extending left and right. The range limiting member 42 is a slider that fits over the sliding rod 37, allowing for left and right sliding movement. The underside of the range limiting member 42 has multiple horizontal surfaces (three in this embodiment) that serve as slider limiting surfaces 42A. These horizontal surfaces increase in distance from the lower edge of the base plate 40 from left to right, and the slider limiting surfaces 42A are connected in sequence, forming a stepped pattern.

[0181] A slider paddle 426 is provided on the front surface of the range limiting member 42 . The slider paddle 426 extends toward the front side, so that a user can paddle the slider paddle 426 from the front side to slide the range limiting member 42 left and right.

[0182] A stopper 48 is located at the lower end of the base plate 40, below the sliding groove 221. When the user slides the range limiter 42 left or right by moving the slider paddle 426, one of the three slider-limiting surfaces 42A aligns longitudinally with the stopper 48. As the lower end of the support plate 30 slides downward, the contact between one of the slider-limiting surfaces 42A and the stopper 48 limits the position of the lower end of the support plate 30. Thus, by moving the slider paddle 426 to align different slider-limiting surfaces 42A with the stopper 48, the range of the lower end of the support plate 30 can be changed, thereby adjusting the range of the curvature of the support plate 40.

[0183] <Example 5>

[0184] This embodiment is another variation of embodiment 2, and provides another implementation of the curvature adjustment mechanism. In this embodiment, the same symbols are given to the same structures as those in embodiment 2, and the same descriptions are omitted.

[0185] Figure 30 is a structural diagram of the curvature adjustment mechanism of Example 5 of the present invention.

[0186] As shown in Figure 30 , in this embodiment, the range limiting member 42 is a limit screw having a handle 4201 at one end. A mounting member 4003 is fixedly mounted on the lower front surface of the base plate 40. The mounting member 4003 is composed of two left and right side walls 4004 and a bottom wall 4005 connected to the lower ends of the two side walls 4004.

[0187] The bottom wall 4005 is provided with a screw hole that mates with the range limiting member 42. The range limiting member 42 screws into the screw hole, and the handle 4201 is exposed below the mounting member 4003 and downward from the lower edge of the base plate 40. In addition, the horizontal dimension of the mounting member 4003 (i.e., the distance between the outer surfaces of the two side walls 4004 in the left-right direction) is smaller than the horizontal dimension of the accommodating cavity 46A. Therefore, when installed, the entire mounting member 4003 can be located within the accommodating cavity 46A.

[0188] In this embodiment, the accommodating portion 46 is provided with a protrusion 461 located in the middle of the upper side of the accommodating cavity 46A. The horizontal width of the protrusion 461 is slightly smaller than the horizontal width of the inner wall of the mounting member 4003 (i.e., the distance between the inner surfaces of the two side walls 4004 in the left-right direction), allowing it to be embedded in the mounting member 4003. The accommodating portion 46 is also provided with clearance holes 46C on either side of the protrusion 461. The two clearance holes 46C correspond to the left and right side walls 4004 of the mounting member 4003, respectively. The left and right side walls 4004 can pass through the clearance holes 46C, respectively, allowing the sliding member 41 to slide up and down relative to the mounting member 4003.

[0189] When subjected to external force, the support plate 30 is deformed and its lower end moves downward, driving the sliding member 41 to move downward. When the protrusion 461 abuts against the upper end of the range limiting member 42, the sliding member 41 no longer moves downward. By rotating the handle 4201 to tighten or unscrew the range limiting member 42, the position of the upper end of the range limiting member 42 can be changed, thereby changing the sliding range of the sliding member 41 and the lower end of the support plate 30, and then correspondingly changing the variable range of the curvature of the support plate 30.

[0190] In this embodiment, a limit screw is used as the range limiting member 42, and the change of the upper end position of the limit screw is achieved by screwing it in and out, which is equivalent to a gearless adjustment. The user can rotate the limit screw 42 and stop it at any appropriate position, thereby achieving more detailed adjustment and better adapting to the needs of the user.

Claims

1. A lumbar support curvature adjustment mechanism, used to adjust the curvature range of the back plate of the lumbar support, characterized in that: include: A base plate, one end of which is connected to one end of the backing plate; Range limiter, The other end of the backing plate is slidable relative to the base plate. The range limiting member is used to limit the other end of the backrest within different sliding ranges, thereby changing the distance variation range of the other end of the backrest relative to the one end of the backrest, thereby achieving adjustment of the curvature variation range of the backrest.

2. The lumbar support curvature adjustment mechanism according to claim 1, characterized in that: in, The range limiting member has a cam portion, The cam portion is provided with at least two cam limiting surfaces, and the distances between the cam limiting surfaces and the center of the cam portion are different.

3. The lumbar support curvature adjustment mechanism according to claim 2, characterized in that: Also includes: a sliding member, slidably disposed on the substrate, Wherein, the other end of the back plate is hinged on the sliding member, The sliding member has a sliding member limiting surface facing the cam portion, The range limiting member can be rotated under the operation of the user, so that different cam limiting surfaces face the sliding member limiting surface, thereby limiting the sliding member through different cam limiting surfaces.

4. The lumbar support curvature adjustment mechanism according to claim 3, characterized in that: in, The sliding member has a through groove, the cam portion is located in the through groove, and the limiting surface of the sliding member is the inner side surface of the through groove.

5. The lumbar support curvature adjustment mechanism according to claim 3, characterized in that: in, The sliding member has a receiving portion capable of receiving the cam portion, and the sliding member limiting surface is an inner upper surface of the receiving portion.

6. The lumbar support curvature adjustment mechanism according to claim 3, characterized in that: in, The base plate is provided with a guide bar for guiding the sliding member to slide relative to the base plate.

7. The lumbar support curvature adjustment mechanism according to claim 6, characterized in that: Also includes: an elastic member, used for providing a force for the sliding member to tend toward the one end of the supporting plate, The elastic member is a spring wire, and the other end of each of the two guide strips is provided with a slot, and the two ends of the elastic member are respectively engaged in the slots, and the sliding member is further provided with a hook, which is hooked in the middle of the elastic member; or The elastic member is a tension spring, and two ends of the tension spring are respectively connected to the sliding member and the base plate.

8. The lumbar support curvature adjustment mechanism according to claim 3, characterized in that: in, The cam portion has a sliding member limiting surface facing the other end of the backing plate, The range limiting member can be rotated under the operation of the user, so that different cam limiting surfaces face the other end of the base plate, thereby limiting the other end of the base plate through different cam limiting surfaces.

9. The lumbar support curvature adjustment mechanism according to claim 8, characterized in that: Also includes: A cover member covers the range limiting member, and the cover member is provided with a plurality of first magnetic members, The cam portion is provided with a second magnetic member capable of engaging with the first magnetic member. When the second magnetic member is rotated to a position aligned with one of the first magnetic members in sequence, one of the cam limiting surfaces can limit the other end of the support plate.

10. The lumbar support curvature adjustment mechanism according to claim 2, characterized in that: in, The lower end of the backing plate is slidably arranged on the base plate. The range limiting member can be rotated under the operation of the user, so that different cam limiting surfaces face the lower end portion of the backing plate, thereby limiting the lower end portion of the backing plate through different cam limiting surfaces.

11. The lumbar support curvature adjustment mechanism according to claim 1, further comprising: a sliding member, slidably disposed on the substrate, Wherein, the other end of the back plate is hinged on the sliding member, The range limiting member is a slider mounted on the base plate so as to be slidable left and right, and the slider has a slider paddle protruding beyond the lower edge of the base plate. The range limiting member has a plurality of horizontal surfaces serving as slider limiting surfaces, and the distances between each of the slider limiting surfaces and the lower edge of the substrate are different.

12. The lumbar support curvature adjustment mechanism according to claim 1, characterized in that: in, The lower end of the backing plate is slidably arranged on the base plate. The range limiting member is a slider mounted on the base plate so as to be slidable left and right, and the slider has a slider paddle protruding beyond the lower edge of the base plate. The range limiting member has a plurality of horizontal surfaces serving as slider limiting surfaces, and the distances between each of the slider limiting surfaces and the lower edge of the substrate are different.

13. The lumbar support curvature adjustment mechanism according to claim 1, further comprising: a sliding member, slidably disposed on the substrate, Wherein, the other end of the back plate is hinged on the sliding member, The range limiting member is a limit screw, one end of which is provided with a rotary handle. A mounting piece with a screw hole is fixedly provided on the base plate, the limiting screw is screwed into the screw hole, the rotary handle is exposed below the mounting piece and downwardly exposed from the lower edge of the base plate, The sliding member is provided with a protrusion which can abut against the upper end of the limiting screw.

14. An adjustable lumbar support, characterized in that: include: A backrest, used to support the user's waist; as well as The lumbar support curvature adjustment mechanism is used to limit the curvature of the back plate of the lumbar support. Wherein, the lumbar support curvature adjustment mechanism is the lumbar support curvature adjustment mechanism according to any one of claims 1 to 13.

Images