Waist support curvature adjusting mechanism and adjustable waist support

Abstract

The purpose of the present invention is to provide a curvature adjusting mechanism for a waist support, the curvature of a backup plate being variable so as to fit the curvature of the waist of different users, the curvature adjusting mechanism comprising: a base plate, one end of which is connected to one end of the backup plate; the other end of the backup plate can slide relative to the base plate, and the range limiting piece is used for limiting the other end of the backup plate within different sliding ranges, so that the distance change range of the other end of the backup plate relative to one end of the backup plate is changed, and the curvature change range of the backup plate is adjusted. The invention further provides an adjustable waist support comprising the curvature adjusting mechanism.

Description

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 seats with backrests, the backrests often do not fit the user's waist and back well, resulting in difficulty in providing good support. Therefore, some users often need additional cushions, lumbar supports, etc. for support.

[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 rear directions; CN202222166953.8 discloses a multi-directional adjustable lumbar support, which can achieve up and down movement through a slider and rail structure, and front and rear adjustment through a rotating shaft. In this type of lumbar support, since the front and rear 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 match the waist position of users of different body shapes, but it is difficult to match the waist curvature of different users. Summary of the invention

[0004] In order to solve the above problems, a lumbar support is provided, the curvature of the backrest being variable so as to be adapted to the lumbar curvatures of different users. The present invention adopts the following technical solutions.

[0005] The present invention provides a lumbar support curvature adjustment mechanism, which is used to adjust the curvature variation range of a backrest plate of the lumbar support, and is characterized in that it comprises: 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 within different slidable 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.

[0006] 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.

[0007] 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, and 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.

[0008] Furthermore, 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 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.

[0009] 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.

[0010] The above-mentioned 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.

[0011] Furthermore, the above-mentioned lumbar support curvature adjustment mechanism provided by the present invention may also include: an elastic member, used 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 each of the two guide strips is provided with a slot, and the two ends of the elastic member are respectively engaged in the slot, 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.

[0012] 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 plate, 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 by different cam limiting surfaces.

[0013] 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 support plate.

[0014] 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 by different cam limiting surfaces.

[0015] In addition, 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 support plate is hinged on the sliding member, and the range limiting member is a slider installed 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, and the range limiting member has 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.

[0016] 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 plate is slidably arranged on the base plate, the range limiting member is a slider installed on the base plate slidably left and right, 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 slider limiting surface and the lower edge of the base plate are different.

[0017] In addition, 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 support plate is hinged on the sliding member, the range limiting member is a limit screw, and a rotary handle is provided at one end of the limit screw, 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 rotary 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.

[0018] The present invention also provides an adjustable lumbar support, characterized in that it comprises: a backrest plate for supporting the user's waist; and a lumbar support curvature adjustment mechanism for limiting the change in the curvature of the backrest plate of the lumbar support, wherein the lumbar support curvature adjustment mechanism is any of the lumbar support curvature adjustment mechanisms described above.

[0019] Function and Effect of the Invention

[0020] 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 as the user's waist forces the back plate, so that its curvature can be changed in real time as the user's waist curve changes, thereby better fitting the user's waist curve; further, since the range limiting member limits the other end of the back plate within 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 their own usage requirements, thereby improving the usage experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional diagram of an adjustable lumbar support according to embodiment 1 of the present invention at one angle;

[0022] Figure 2 is a three-dimensional diagram of the adjustable lumbar support of embodiment 1 of the present invention from another angle;

[0023] Figure 3 is a side view of the adjustable lumbar support according to embodiment 1 of the present invention;

[0024] Figure 4 is an exploded view of the adjustable lumbar support according to Embodiment 1 of the present invention;

[0025] Figure 5 is an enlarged view of the mounting portion of the upper end of the backing plate of the substrate of Example 1 of the present invention;

[0026] Figure 6 is a structural diagram of a sliding member according to Embodiment 1 of the present invention;

[0027] Figure 7 is a partial exploded view of the installation structure of the sliding member and the range limiting member of the substrate in Example 1 of the present invention;

[0028] Figure 8 is a partial structural diagram of the installation position of the range limiting member of the substrate of Example 1 of the present invention;

[0029] Fig. 9 is a structural diagram of a range limiting member according to Embodiment 1 of the present invention;

[0030] Fig.10 is a schematic diagram of the shape of the cam portion of Example 1 of the present invention;

[0031] Fig.11 This is a structural diagram of the backing plate connection of Example 1 of the present invention;

[0032] Fig.12 is a schematic diagram of curvature adjustment in Example 1 of the present invention;

[0033] Fig.13 is a schematic diagram of curvature adjustment in Example 1 of the present invention;

[0034] Fig.14 This is a diagram of the cover plate and base plate installation structure of Example 1 of the present invention.

[0035] Fig.15 It is a structural diagram of the height adjustment mechanism of Example 1 of the present invention.

[0036] Fig.16 is an exploded view of an adjustable lumbar support according to variation 1 of the present invention;

[0037] Fig.17 This is a structural diagram of the cover plate installation of the adjustable lumbar support according to variation 1 of the present invention;

[0038] Fig.18 is an exploded view of an adjustable lumbar support according to Embodiment 2 of the present invention;

[0039] Fig.19 is a structural diagram of a curvature adjustment mechanism according to Embodiment 2 of the present invention;

[0040] Fig. 20 is a schematic structural diagram of a height adjustment mechanism of Embodiment 2 of the present invention;

[0041] Fig.21 is a rear angle structural diagram of an adjustable lumbar support according to embodiment 2 of the present invention;

[0042] Fig. 22 is a structural diagram of a lumbar support according to Embodiment 3 of the present invention;

[0043] Fig.23 is an exploded view of a lumbar support according to Embodiment 3 of the present invention;

[0044] Fig.24 is a structural diagram of a curvature adjustment mechanism of a second variation of the present invention;

[0045] Fig.25 is a structural diagram of the curvature adjustment mechanism in Variation 3 of the present invention;

[0046] Fig.26 is an exploded view of the curvature adjustment mechanism in Variation 3 of the present invention;

[0047] Fig. 27 is a structural diagram of a curvature adjustment mechanism according to Embodiment 4 of the present invention;

[0048] Fig.28 is a structural diagram of a curvature adjustment mechanism of a fourth variation of the present invention;

[0049] Fig.29 is a structural diagram of a curvature adjustment mechanism of a fifth variation of the present invention;

[0050] Fig.30 It is a structural diagram of the curvature adjustment mechanism of Example 5 of the present invention.

[0051] Reference numerals: waist 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; bearing protrusion 33; sliding protrusion 34; adjusting matching 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 connection portion 4031; protrusion hinge portion 4032; first hinge assembly 404; hinge sheet 4041; hinge buckle 405; buckle connection 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; sliding member 41; through groove 411; sliding member limiting surface 411A; hook portion 412; sliding member hinge portion 413; block 414; range limiting member 42; disc portion 421; limiting protrusion 4211; cam portions 422, 4222; cam limiting surfaces 422A, 422B, 422C; toggle portion 4223; connecting hole 4224; mounting portion 423; handle portion 424; slider limiting surface 42A; slider paddles 425, 426; elastic member 43; cover member 45; first magnetic The magnetic member 451; the second magnetic member 452; the engaging recess 453; the hollow portion 454; the accommodating portion 46; the accommodating cavity 46A; the protrusion 461; the protrusion 462; the blocks 47, 48; the handle 4201; the mounting shaft 4001; the guide rail 4002; the mounting member 4003; the side wall 4004; the bottom wall 4005; the clearance hole 46C; the tooth grooves 51, 54; the top gear member 52; the tooth tip portion 521; the lever member 53; the paddle 531; the lever recess 532; the lever deformation beam 55; the top gear member 56. DETAILED DESCRIPTION

[0052] The present invention provides a curvature adjustment mechanism and an adjustable lumbar support including the curvature adjustment mechanism. The adjustable lumbar support can be arranged on a seat or other seat to support the waist of a user. The following is a specific description of the embodiment of being arranged on a car seat. In the following embodiments, the description of the front and back, up and down, left and right directions is based on the state of the user sitting on the car seat.

[0053] <Example 1>

[0054] Figure 1 is a three-dimensional diagram of an adjustable lumbar support according to Embodiment 1 of the present invention at one angle. Figure 2 is a three-dimensional diagram of the adjustable lumbar support of Embodiment 1 of the present invention from another angle. Figure 3is a side view of the adjustable lumbar support according to embodiment 1 of the present invention, Figure 4 It is an exploded view of the adjustable lumbar support according to embodiment 1 of the present invention.

[0055] like Figures 1 to 4 As shown, 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.

[0056] The inserting plate 10 is used to be inserted between the backrest and the seat surface of the seat when in use, so that the lumbar support 100 can be relatively fixed on the seat.

[0057] The lower end of the bottom plate 20 is hinged to the front end of the plug board 10. In this embodiment, the bottom plate 20 is approximately rectangular in shape, and its lower end (ie, the short side portion on the lower side) is rotatably connected to the front end of the plug board 10 through a hinge structure. Figure 1 to Figure 3 In the figure, the inserting plate 10 is shown to be extended backwards, in which the inserting plate 10 can be inserted between the backrest and the seat surface of the chair; when not in use, the inserting plate 10 can be rotated and further rotated backwards to be attached to the rear side, so as to facilitate storage. In addition, when the lumbar support 100 is used alone, the inserting plate 10 can also be rotated forwards to be used as a support foot, so that the lumbar support 100 as a whole can be placed stably without the need for an additional support structure.

[0058] As an alternative, in other embodiments, the lower end of the bottom plate 20 may also be rotatably connected to the plug board 10 via other connection structures, or may be fixedly connected to the plug board 10 , or may be formed integrally with the plug board 10 .

[0059] The backrest 30 is used to support the user's waist, and its shape has a certain curvature. Specifically, based on the usage state, the middle part of the backrest 30 is arched forward, and the edges on both sides of the middle part are bent forward, so that it can fit the physiological curve of the human waist. In this embodiment, the backrest 30 is made of a material that can be deformed to a certain extent and has a certain toughness, such as engineering plastics; thus, the backrest 30 can support the user's waist and deform when subjected to external force, thereby changing the curvature. In this embodiment, a soft pad 301 is also provided on the front side of the backrest 30.

[0060] In Example 1 of the present invention, the backboard 30 is installed via a curvature adjustment mechanism, which can allow the backboard 30 to change its curvature when subjected to external force (such as the force generated by the user's waist leaning against the backboard 30) and adjust the range of such change.

[0061] 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 .

[0062] Figure 5This is an enlarged view of the mounting portion of the upper end of the substrate of Example 1 of the present invention.

[0063] like Figures 3 to 5 As shown, the upper end of the back plate 30 is rotatably connected to the upper end of the base plate 40 via a hinge mechanism, and the hinge mechanism includes a first hinge protrusion 402, a second hinge protrusion 403, a first hinge assembly 404 and a second hinge assembly.

[0064] The first hinge protrusion 402 is disposed on the upper rear surface 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 the cylindrical shape is used as a hinge surface, and its cylindrical center line extends in the left-right direction.

[0065] There are two second hinge protrusions 403, which are arranged on the rear surface of the upper end of the back plate 30 and are located 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 raised connection parts 4031 and a raised hinge part 4032, wherein the raised connection part 4031 is formed integrally with the back plate 30 and protrudes from the rear surface of the back plate 30, and the raised hinge part 4032 is approximately columnar and has a cylindrical hinge surface; the two ends of the raised hinge part 4032 are respectively connected to the raised connection part 4031, and its hinge surface faces the front side obliquely downward. The cylindrical center lines of the hinge surfaces of the two raised hinge parts 4032 are both colinear with the cylindrical center line of the first hinge protrusion 402, thereby, the first hinge protrusion 402 and the two second hinge protrusions 403 together form a structure similar to a hinge axis.

[0066] The first hinge assembly 404 includes a plurality of hinge pieces 4041 disposed at the middle of the upper front surface of the base plate 40, and the position of the hinge piece 4041 corresponds to the first hinge protrusion 402. The upper front side surface of each hinge piece 4041 is an arc surface with the same size and the same center, and each hinge piece 4041 is arranged in parallel, so that these arc surfaces are all located on the same cylindrical surface, and the cylindrical surface matches the shape of the hinge surface of the first hinge protrusion 402, forming a hinge surface. In addition, the lower front side surface of each hinge piece 4041 is an inclined straight surface with substantially the same length and substantially the same inclination angle, and these inclined straight surfaces are located on the same inclined surface.

[0067] The second hinge assembly includes two hinge buckles 405, which are respectively arranged at the positions on both sides of the upper front surface of the base plate 40, corresponding to the positions of the second hinge protrusions 403. Each hinge buckle 405 includes a buckle connection part 4051 integrally connected with the base plate 40 and a buckle hinge part 4052 located at one end of the buckle connection part 4051 away from the base plate 40. The rear side surface of the buckle hinge part 4052 is a cylindrical surface, and the shape of the cylindrical surface matches the hinge surface of the second hinge protrusion 403 to form a hinge surface. In addition, the center line of the cylindrical shape of the hinge surface formed by the first hinge assembly 404 and the hinge surfaces of the two buckle hinge parts 4052 is located on the same straight line a.

[0068] During installation, the first hinge protrusion 402 is placed on the upper part 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. Since 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 coaxial (that is, the axes are both on the straight 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, and the back plate 30 can be removed from the base plate 40. Therefore, no additional connecting parts such as bolts are required, and disassembly and assembly are convenient.

[0069] 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.

[0070] Figure 6 is a structural diagram of a sliding member according to Embodiment 1 of the present invention, Figure 7 It is a partial exploded view of the sliding member and the range limiting member installation structure of the substrate of Example 1 of the present invention, Figure 8 It is a partial structural diagram of the installation position of the range limiting member of the substrate of Example 1 of the present invention.

[0071] like Figure 4 as well as Figure 6 to Figure 8As shown, the sliding member 41 is in the shape of a rectangular plate, and the base plate 40 is provided with guide bars 406 corresponding to the left and right sides of the sliding member 41. The guide bars 406 are parallel to each other and extend along the length direction of the base plate 40. The sliding member 41 is arranged between the two guide bars 406 and can slide relative to the base plate 40 under the guidance of the guide bars 406.

[0072] In addition, a through slot 411 is provided in the middle of the sliding member 41 , a hook portion 412 is provided at the rear side of the upper portion, and a sliding member hinge portion 413 is provided at the lower portion.

[0073] The base plate 40 is provided with a cam mounting hole 407 which is generally circular and located between the two guide strips 406. The edge of the cam mounting hole 407 is formed with a mounting step 408 which is slightly larger in diameter. The base plate 40 is also provided with a supporting boss 23 which is located at the lower edge of the cam mounting hole 407. The upper surface of the supporting boss 23 is in an arc shape, and the center of the arc shape overlaps with the center of the cam mounting hole 407. In this embodiment, the supporting boss 23 also has a plurality of reinforcing ribs 231 extending downward.

[0074] Fig. 9 It is a structural diagram of the range limiting component of Example 1 of the present invention.

[0075] like Figure 2 , 7 As shown in FIG. 9 , the range limiting member 42 is a cam having a circular disc portion 421 , a cam portion 422 arranged on the front side surface of the disc portion 421 , and a mounting portion 423 arranged on the rear side surface of the disc portion 421 .

[0076] 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.

[0077] like Figure 2 As shown, 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, and 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 limiting member 42 as a whole.

[0078] Fig.10 It is a schematic diagram of the shape of the cam portion of Example 1 of the present invention.

[0079] like Fig. 9 , 10As shown, the cam portion 422 is in the shape of a circular boss with a diameter greater than that of the disc portion 421 , and its upper outer surface includes three cam limiting surfaces, and the three cam limiting surfaces are all plane surfaces.

[0080] like Fig.10 As shown, the three cam limit surfaces are three straight lines connected end to end when viewed from the front of the cam portion 422 , that is, the three cam limit surfaces are connected in sequence and are all in a state of being approximately perpendicular to the radial direction of the cam portion 422 .

[0081] The three cam limiting surfaces are sequentially recorded as 422A, 422B, and 422C, and the distances between the cam limiting surfaces 422A, 422B, and 422C and the center of the cam portion 422 are sequentially increased. 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.

[0082] like Figure 4 , 6 As shown, the through slot 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 just located in the through slot 411 .

[0083] The upper inner surface of the through groove 411 faces the cam portion 422, and the surface is the slider limiting surface 411A. The slider limiting surface 411A is a plane, and is perpendicular to the radial direction of the cam portion 422 when the slider 41 is installed. Therefore, when the user twists the handle portion 424 to rotate the range limiter 42, the cam limiting surface 422A, 422B or 422C can be opposite to the slider limiting surface 411A and can abut against the slider limiting surface 411A.

[0084] In addition, when the sliding member 41 slides upward, the reinforcing rib 231 can be used as a limiting component to abut against the lower surface of the through groove 411. In other words, the upper end point position of the slidable range of the sliding member 41 can be limited by the limiting effect of the reinforcing rib 231. As an alternative, a limiting component can be provided at the upper position of the sliding member 41 to abut against the upper outer surface of the sliding member 41, or the lower surface of the baffle portion 4061 can be used to abut against the upper outer surface of the sliding member 41, thereby limiting the upper end point position of the slidable range of the sliding member 41.

[0085] A limiting protrusion 4211 is provided on the upper part of the disc portion 421, and a blocking protrusion 4081 matching with the limiting protrusion 4211 is provided at the inner edges of both sides of the installation step 408. If the user twists the handle portion 424 to rotate the range limiting member 42 clockwise or counterclockwise, one or the other of the blocking protrusions 4081 will abut against the limiting protrusion 4211, thereby limiting the rotation stroke of the range limiting member 42. In this embodiment, the end points of the rotation stroke of the range limiting member 42 in two directions are respectively the positions where the cam limiting surface 422A and the sliding member limiting surface 411A are opposite, and the positions where the cam limiting surface 422C and the sliding member limiting surface 411A are opposite.

[0086] like Figure 4 , Figure 6 As shown, in this embodiment, the elastic member 43 is a spring wire. Figure 8 As shown, the lower end of the two guide bars 406 is respectively provided with a slot 4062, and the two ends of the elastic member 43 are respectively engaged in the slot 4062, so that the two ends of the elastic member 43 are respectively fixed to the lower ends of the two guide bars 406. The opening direction of the hook portion 412 is downward, and it is hooked on the middle part of the elastic member 43, so that the elastic member 43 provides a tendency force toward the baffle portion 4061 (equivalent to upward) to the sliding member 41 through the hook portion 412. In addition, as an alternative, the elastic member 43 can also be other types of spring-like components, for example, it can be a tension spring or a compression spring, one end of which is connected to the sliding member 41 and the other end is connected to the base plate 40, which always pulls or supports the sliding member 41, thereby providing a tendency force toward the baffle portion 4061 to the sliding member 41.

[0087] Fig.11 It is a structural diagram of the support plate connection of Example 1 of the present invention.

[0088] like Fig.11 As shown, a back plate hinge portion 31 is provided at the lower rear end portion of the back plate 30, the middle portion of which is recessed 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 back plate hinge portion 31, so that the lower end of the back plate 30 is hinged to the lower end of the sliding member 41.

[0089] Fig.12 is a schematic diagram of curvature adjustment in Example 1 of the present invention, Fig.13 This is a schematic diagram of the curvature adjustment of Example 1 of the present invention.

[0090] like Fig.12As shown, 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 sliding member 41 through the cooperation of the back plate hinge part 31, the rotating shaft 32 and the sliding member hinge part 413. When the sliding member 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.

[0091] In addition, since the elastic member 43 provides an upward force to the sliding member 41 through the hook 412, when no external force is applied, the sliding member 41 is usually located at a position abutting against the reinforcing rib 231, that is, located at an upper position (hereinafter referred to as the initial position of the sliding member 41); at this time, the distance L is the shortest. When an external force is applied, for example, when the user's waist leans on the backboard 30 and a backward force is applied to the backboard 30, the force will cause the arched part of the middle part of the backboard 30 to be pressed backward, so that the backboard 30 has a tendency to stretch, and the lower end of the backboard 30 will drive the sliding member 41 to overcome the upward force of the elastic member 43 and move downward, resulting in a longer distance L. Since the backboard 30 can be deformed, when the distance L becomes longer, the curvature of the backboard 30 will decrease; otherwise, the curvature will increase.

[0092] like Fig.12 , 13 As shown, the user can rotate the handle 424 to rotate the range limiter 42, so that one of the cam limiter surfaces 422A, 422B, 422C faces the slider limiter surface 411A. It can be seen that when the slider 41 slides down, if the slider limiter surface 411A abuts against one of the cam limiter surfaces 422A, 422B, 422C, the slider 41 will not be able to continue to slide down and will be limited.

[0093] like Fig.13 As shown, when the cam limit surface 422A is facing the sliding member limit surface 411A, since 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, when the cam limit surface 422A is facing the sliding member limit surface 411A, the extreme position of the sliding of the sliding member 41 corresponds to the position where the sliding member limit surface 411A abuts against 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, therefore, in this case, the range D1 in which the sliding member 41 can slide down is the longest.

[0094] 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.

[0095] As described above, when the user rotates the handle 424, the slidable range of the slider 41 can be changed to D1, D2 or D3. Accordingly, the lower end of the backing plate 30 slides with the slider 41, and its slidable range will also change between D1, D2 or D3. The distance between the lower end of the backing plate 30 and the upper end when it is not subjected to external force is recorded as L0. When the slidable range is D1, once the backing plate 30 is subjected to external force, the distance L can change between L0 and L0+D1; similarly, when the slidable range is D2, the distance L can change between L0 and L0+D2, and when the slidable range is D3, the distance L can change between L0 and L0+D3. By changing the slidable range between the slider 41 and the lower end of the backing plate 30, the user can change the variable range of the distance L between the upper and lower ends of the backing plate 30, thereby correspondingly changing the variable range of the curvature of the backing plate 30.

[0096] That is to say, the curvature adjustment mechanism of this embodiment can not only allow the curvature of the backrest 30 to change to match the user's waist curvature and improve the comfort of use, but also change the variable range of the curvature so that the user can choose different curvature variable ranges according to actual use experience, thereby further improving the comfort of use.

[0097] Fig.14 This is a diagram of the cover plate and base plate installation structure of Example 1 of the present invention.

[0098] like Figure 4 , 14As shown, the cover 45 covers the sliding member 41, the range limiting member 42 and other components, and can prevent the sliding member 41 and the range limiting member 42 from loosening forward without affecting the sliding up and down sliding of the sliding member 41 and the rotation of the range limiting member 42. The cover 45 is provided with three first magnetic members 451 arranged in the circumferential direction, and the cam portion 422 is provided with a second magnetic member 452. The second magnetic member 452 and the first magnetic member 451 can attract each other, and at the same time, the second magnetic member 452 can move in the circumferential direction by driving the rotation of the cam portion 422 through the handle portion 424, so as to align with one of the three first magnetic members 451 in turn and attract and fit each other. The three first magnetic members 451 are respectively arranged at specific positions, so that when the second magnetic member 452 rotates to the position aligned with the three first magnetic members 451 in turn, one of the cam limiting surfaces 422A, 422B, 422C is just aligned with the sliding member limiting 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 limit surfaces 422A, 422B, 422C is aligned with the sliding part limit surface 411A, avoiding the problem that the part between the cam limit surfaces cannot be aligned with the sliding part limit surface 411A.

[0099] 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.

[0100] Fig.15 It is a structural diagram of the height adjustment mechanism of Example 1 of the present invention.

[0101] like Figure 4 , 7 as well as Fig.15 As shown, a height adjustment mechanism is further provided between the bottom plate 20 and the base plate 40 , and the height adjustment mechanism includes a tooth groove 51 , a top tooth member 52 and a lever member 53 .

[0102] 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 .

[0103] A transversely extending receiving groove 4061 is provided at the middle of the base plate 40, and two top gear members 52 are provided in the receiving groove 4061. A tooth tip 521 is provided at the outer end of each of the two top gear members 52. The two tooth grooves 51 are respectively located on both sides of the receiving groove 4061, each of which is opposite to a tooth tip 521, and the shape of the recess in the tooth groove 51 matches the shape of the corresponding tooth tip 521.

[0104] 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 outward direction (i.e., toward the direction away from the longitudinal center line of the base plate 40) to the top tooth part 52.

[0105] The upper part of the base plate 40 is also provided with a lever groove 409 and a lever receiving portion 410. The lower end of the lever groove 409 is connected to the receiving groove 4061. The lever receiving portion 410 is located at the upper end of the lever groove 409 and has a cavity with an opening facing downward. The lever member 53 is entirely located in the lever groove 409, and the upper end extends into the lever receiving portion 410. In addition, as shown in FIG. Fig.14 As shown, the upper end of the cover plate 45 also extends into the lever receiving portion 410, and the lower end is buckled on the lower front surface of the base plate 40 through a slot. At the same time, the bottom plate 20 also covers the upper half of the base plate 45 from the front side to further prevent the cover plate 45 from being separated from the base plate 40.

[0106] like Figure 2 As shown, a through slot is provided at the lever accommodating portion 410 of the base plate 40, so that the upper rear surface of the lever member 53 is exposed from the rear side of the base plate 40. A paddle 531 is provided at the upper rear surface of the lever member 53, and the user can move the paddle 531 to move the lever member 531 up and down.

[0107] like Fig.12 , 14 As shown, the lower end of the lever 53 extends into the receiving groove 4061 and is located between the two top teeth 52. The lower end has a certain width, and its two side edges can respectively abut against the inner ends of the two top teeth 52, so that the top teeth 52 cannot move inward. In this state, the outer end of the top teeth 52 is located at a more outward position, and the tooth tip 521 is just located in a certain depression of the tooth groove 51, and is engaged with the tooth groove 51, so that the bottom plate 20 and the base plate 40 cannot move up and down.

[0108] In this embodiment, a magnetic member is provided on each of the lever member 53 and the cover member 45, and the two magnetic members can attract each other, so that the lever member 53 is always in a state where its lower end abuts against the inner ends of the two top gear members 52 when no external force is applied. As an alternative, in other embodiments, a spring may be provided in the lever member 53, and the lever member 53 may be reset by the spring force, so that the lever member 53 is always in a state where its lower end abuts against the inner ends of the two top gear members 52 when no external force is applied.

[0109] On the lever member 53, there is a lever recess 532 on both sides of the part above the lower end, and the upper and lower side surfaces of the lever recess 532 are both inclined surfaces. In addition, the lower end surface of the lever member 53 is also inclined, and the upper and lower side surfaces of the inner end of the top gear member 52 are also inclined. When the lever member 53 moves downward so that the lever recess 532 reaches the position of the top gear member 52, or when the lever member 53 moves upward so that the top gear member 52 reaches the inclined part of the lower end surface of the lever member 53, the lever member 53 no longer abuts against the inner side of the top gear member 52, and thus no longer abuts against the top gear member 52. At this time, the user can drag the base plate 40 up and down, so that the top gear member 52 and the tooth groove 51 are displaced up and down. Under the abutment of the sharp teeth of the tooth groove 51, the top gear member 52 overcomes the spring force and retracts, so that the base plate 40 and the bottom plate 20 can move up and down. 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 is no longer opposite to 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, and accordingly, the base plate 40 and the bottom plate 20 can no longer move up and down.

[0110] 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 relatively displaced up and down. 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 plate 10, thereby completing the height change of the back plate 30.

[0111] Functions and Effects of the Embodiments

[0112] In the curvature adjustment mechanism and the adjustable lumbar support of this embodiment, since the supporting boss limits one end position of the slidable range of the sliding member, and the range limiting member limits the other end position of the slidable range of the sliding member by the contact between the cam limiting surface and the sliding member limiting surface, the sliding member can slide between the two end positions, so that one end (i.e., the lower end) of the back plate is slidable relative to the base plate within a certain range. When the user's waist leans on the back plate, the waist will exert a certain force on the back plate, and the mobility of the lower end of the back plate allows the back plate to deform to a certain extent with the waist force, so that the curvature of the back plate can change in real time with the waist curve of the user, so as to better fit the waist curve of the user.

[0113] Moreover, the mobility of the lower end of the backrest also enables the backrest to have a certain deformation range, which can cushion the user's waist in the event of external force impact, such as bumpy driving.

[0114] Furthermore, since the cam limit surface can cooperate and abut against different sliding member limit surfaces, the position of the other end point 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.

[0115] <Modification 1>

[0116] This modification is a modification of Embodiment 1. In this modification, the same reference numerals are given to the same structures as those in Embodiment 1, and the same descriptions are omitted.

[0117] Fig.16 is an exploded view of an adjustable lumbar support according to variation 1 of the present invention, Fig.17 It is a schematic diagram of the cover installation structure of the adjustable lumbar support according to variation 1 of the present invention.

[0118] like Fig.16 , 17 As shown, the adjustable lumbar support 200 of this modified example includes an inserting plate 10, a backing plate 30 and a curvature adjustment mechanism, but compared with the first embodiment, the adjustable lumbar support 200 does not have a height adjustment mechanism.

[0119] 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 plug board 10 , and the base plate 40 cannot slide relative to the bottom plate 20 .

[0120] In this modified example, a cover plate inserting portion 26 is provided on the base plate 40, which is located above the cam mounting hole 407, and a snap-fitting protrusion 24 is also provided below the supporting boss 23. A snap-fitting recess 453 matching the snap-fitting protrusion 24 is also provided on the rear side surface of the lower end of the cover member 45. During installation, the upper end of the cover member 45 extends into the cover plate inserting portion 26, and the middle portion is combined with the base plate 40 by inserting the snap-fitting protrusion 24 into the snap-fitting recess 453. A recessed portion 25 matching the shape of the lower half of the cover member 45 is formed on the front side surface of the lower portion of the base plate 40. After the cover member 45 is installed, its lower half matches the recessed portion 25, thereby achieving the installation of the cover member 45.

[0121] In this variation, a hollow portion 454 is provided on the cover 45 in the first embodiment, and the backing plate hinge portion 31 at the lower end of the backing plate 30 passes through the hollow portion 454 and is then connected to the rotating shaft 32 .

[0122] The adjustable lumbar support 200 of this variant does not have a height adjustment mechanism, and the base plate 40 is formed integrally with the bottom plate 20. The height of the base plate 40 relative to the plug plate 10 cannot be changed, that is, the height adjustment cannot be achieved. However, since the curvature adjustment mechanism, except for the adaptive change in the installation structure of the cover 45, other components are the same as those of Example 1, and therefore, the same curvature change range adjustment function as Example 1 can be achieved, and the corresponding use effect can also be achieved. In addition, since in this variant, the installation of the cover 45 is achieved by inserting the upper end and engaging the lower end, its installation does not require installation components such as screws, thereby achieving screw-free installation of the entire adjustable lumbar support.

[0123] <Example 2>

[0124] In this embodiment, the same symbols are given to the same structures as those in Embodiment 1, and the same descriptions are omitted.

[0125] Fig.18 It is an exploded view of the adjustable lumbar support according to embodiment 2 of the present invention.

[0126] like Fig.18 As shown, the adjustable lumbar support 300 of this embodiment includes an inserting plate 10, a bottom plate 20, a backing plate 30, a curvature adjusting mechanism and a height adjusting mechanism.

[0127] 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 .

[0128] Fig.19 It is a structural diagram of the curvature adjustment mechanism of Example 2 of the present invention.

[0129] like Fig.19 As shown, 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 embodiment 1.

[0130] Specifically, the range limiting member 42 of the present embodiment is a cam member having a cam portion 4222 and a toggle portion 4223 .

[0131] The cam portion 4222 is rotatably mounted on the lower front surface of the substrate 40 via a mounting shaft 4001. Similar to Example 1, the upper side of the cam portion 4222 also has three cam limit surfaces at different distances from the center of the circle. Different from Example 1, 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.

[0132] The sliding member 41 of this embodiment is approximately plate-shaped, with a receiving portion 46 provided at the bottom, and a receiving cavity 46A provided at the rear side of the receiving portion 46, the size of which is larger than the size of the cam portion 4222; the inner upper surface of the receiving cavity 46A is a plane, and the inner upper surface is used as a sliding member limiting surface 46B, which abuts against the cam limiting surface of the cam portion 4222 to limit the sliding limit position of the sliding member 41. In addition, the lower part of the receiving portion 46 is a hollow structure, so that the toggle portion 4223 is exposed from the lower side thereof.

[0133] In this embodiment, 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 hinge mechanism is different from that of the embodiment 1. Specifically, the upper end of the back plate 30 is provided with a load-bearing protrusion 33 extending to the rear side and an anti-detachment hook portion (not shown in the figure) arranged 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-detachment hole 401 corresponding to the anti-detachment hook portion. The load-bearing protrusion 33 extends obliquely upward to the rear side, the load-bearing recess 4011 is in a concave shape that basically matches the shape of the load-bearing protrusion 33, and the anti-detachment hole 401 and the anti-detachment hook portion both extend approximately horizontally; during installation, the load-bearing protrusion 33 is embedded in the load-bearing recess 4011, and the anti-detachment hook portion is inserted into the anti-detachment hole 401, so that the hinge connection between the back plate 30 and the upper end of the base plate 40 can be completed.

[0134] 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, which will not be repeated here.

[0135] The curvature adjustment of this embodiment is the adjustment of the curvature variable range, and its adjustment principle is similar to that of Embodiment 1. Specifically, since the lower end of the support plate 30 is hinged on the accommodating portion 46, when the sliding member 41 moves up and down, the lower end of the support plate 30 can follow the movement. In this embodiment, there is no limit component for the upper limit position of the sliding member 41, and there is no component that provides an upward force like the elastic member 43 of Embodiment 1, but since the support plate 30 itself has a certain curvature, therefore, when not subject to external force, the position of the lower end of the support plate 30 is the uppermost position of its moving stroke. When subjected to external force, the back plate 30 is deformed and its lower end moves downward, driving the sliding member 41 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.

[0136] Fig. 20 is a schematic structural diagram of a height adjustment mechanism according to Embodiment 2 of the present invention, Fig.21 It is a rear angle structural diagram of the adjustable lumbar support according to embodiment 2 of the present invention. Fig. 20 In order to clearly show the internal structure, part of the structure of the substrate receiving portion is omitted.

[0137] like Fig. 20 , Fig.21 As shown, in this embodiment, the front side of the bottom plate 20 is provided with a substrate receiving portion 22, and the substrate 40 is slidably arranged in the substrate receiving portion 22. In addition, the front side of the substrate receiving portion 22 is provided with a hollow portion so that the receiving portion 46 of the sliding member 41 can be exposed.

[0138] like Figures 20-21 As shown, the lever member 53 is arranged at the upper front part of the base plate 40, and due to the abutment of the base plate receiving portion 22, the lever member 53 will not be separated from the base plate 40. The lower end of the lever member 53 is fixedly connected with a lever deformation beam 55 extending horizontally, and the lever deformation beam 55 has a certain elasticity, and a top tooth member 56 is respectively provided at both ends, and the two top tooth members 56 are respectively exposed from the two sides of the base plate 40; two opposite tooth grooves 54 are provided on the inner surfaces of the two sides of the base plate receiving portion 22, and when no external force is applied, the top tooth members 56 are respectively engaged in the tooth grooves 54 on the corresponding sides.

[0139] In this embodiment, similar to the first embodiment, the paddle 531 of the lever member 53 is also exposed from the rear side of the bottom plate 20. When the user paddles the paddle 531, the lever member 53 can be pressed downward or pulled upward, so that the middle part of the lever deformation beam 55 is driven to move downward or upward, thereby deforming. The 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. At this time, the user can drag the bottom plate 20 or the base plate 40 to make the two move relative to each other, thereby changing the height of the base plate 40 and the backing plate 30.

[0140] <Example 3>

[0141] This embodiment is a variation of the 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 the embodiment 2, and the same descriptions are omitted.

[0142] Fig. 22 is a structural diagram of a waist support according to Embodiment 3 of the present invention, Fig.23 4 is an exploded view of the lumbar support according to the third embodiment of the present invention.

[0143] like Fig. 22 , 23 As shown, compared with Embodiment 2, the curvature adjustment mechanism of this embodiment does not have the sliding member 41.

[0144] 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.

[0145] The structure of the range limiting member 42 of this embodiment is the same as that of the embodiment 2, and the range limiting member 42 is rotatably mounted on the lower front surface of the base plate 40 and is located in the sliding groove 221. When the user moves the cam portion 4222 through the moving portion 4223, different cam limiting surfaces can be directed toward the lower end of the back plate 30, thereby limiting the lower end of the back plate 30 within different slidable ranges, thereby correspondingly changing the variable range of the curvature of the back plate 30.

[0146] 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 is also possible to 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.

[0147] <Modification 2>

[0148] This modification is a modification of the third embodiment, and the main difference between this modification and the third embodiment is that there is no height adjustment mechanism. In this modification, the same symbols are given to the same structures as those in the third embodiment, and the same description is omitted.

[0149] Fig.24 is a structural diagram of the curvature adjustment mechanism of Modification 2 of the present invention, Fig.24 The plug board 10 is omitted.

[0150] like Fig.24 As shown, in variant 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; both 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 arranged on the base plate 40.

[0151] 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 slipping out from above the sliding groove 221 .

[0152] In this modification, 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 third embodiment, and can also achieve the adjustment of the curvature variation range.

[0153] <Variation 3>

[0154] This modification is another modification of Example 3 based on Modification 2, and the difference between this modification and Modification 2 is that the installation position of the range limiter is different. In this modification, the same symbols are given to the same structures as those in Example 3 and Modification 2, and the same descriptions are omitted.

[0155] Fig.25 is a structural diagram of the curvature adjustment mechanism in Variation 3 of the present invention, Fig.26 It is a disassembled diagram of the curvature adjustment mechanism in variant example 3 of the present invention. Fig.25 , 26 The plug board 10 is omitted.

[0156] like Fig.25 , 26 As shown, 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. A sliding protrusion 34 is provided on both sides of the lower end of the support plate 30, 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. In addition, a blocking portion 2211 is provided at the upper end of the sliding groove 221, which is used to block the lower end of the support plate 30 to prevent the lower end of the support plate 30 from slipping out from the upper side of the sliding groove 221.

[0157] 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 .

[0158] Specifically, a limiting member connecting portion 36 is provided at the rear side of the lower end of the back plate 30, and the limiting member connecting portion 36 is cylindrical; the range limiting member 42 includes a cam portion 4222, and a connecting hole 4224 is provided at the center of the cam portion 4222, and the limiting member connecting portion 36 is embedded in the connecting hole 4224, so that the range limiting member 42 is rotatably connected to the lower end of the back plate 30. A lever 4225 is provided at the front side of the cam portion 4222, and the range limiting member 42 can be rotated on the lower end of the back plate 30 by shifting the lever 4225 from the front side.

[0159] A stopper 47 is provided on the base plate 40 below the sliding groove 221. When the user turns the lever 4225 to rotate the cam portion 4222 and makes different cam limiting surfaces of the cam portion 4222 face the stopper 47, the sliding range of the range limiting member 42 and the lower end of the back plate 30 can be changed through the abutment between the different cam limiting surfaces and the stopper 47, thereby changing the variable range of the curvature of the back plate 30 accordingly.

[0160] 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.

[0161] <Example 4>

[0162] This embodiment is another variation of the 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 the embodiment 2, and the same descriptions are omitted.

[0163] Fig. 27 It is a structural diagram of the curvature adjustment mechanism of embodiment 4 of the present invention.

[0164] like Fig. 27 As shown, 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 at the rear side of the range limiting member 42 and is embedded in the guide rail 4002, so that the range limiting member 42 can slide left and right.

[0165] The upper surface of the range limiting member 42 has a plurality of horizontal surfaces (specifically three in this embodiment) as slider limiting surfaces 42A. From left to right, the distances from these horizontal surfaces to the lower edge of the base plate 40 decrease in sequence, and the slider limiting surfaces 42A are sequentially connected to form a step shape. A slider paddle 425 is provided at the lower portion of the range limiting member 42. The slider paddle 425 extends downward and protrudes beyond the lower edge of the base plate 40.

[0166] The receiving portion 46 of this embodiment is also provided with a protrusion 461 located in the middle of the upper side of the receiving cavity 46A, and the width of the protrusion 461 is less than or equal to the horizontal length of the slider limiting surface 42A. 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 one of the slider limiting surfaces 42A, it will no longer move downward; by toggling the slider paddle 425 to allow the range limiting member 42 to slide left and right, different slider limiting surfaces 42A can be directed toward the protrusion 461, thereby changing the slidable range of the sliding member 41 and the lower end of the support plate 30 by abutting different slider limiting surfaces 42A against the protrusion 461, and then correspondingly changing the variable range of the curvature of the support plate 30.

[0167] <Variation 4>

[0168] This modification is a modification of the fourth embodiment, and differs from the fourth embodiment in that it does not have a height adjustment mechanism. In this modification, the same symbols are given to the same structures as the fourth embodiment, and the same description is omitted.

[0169] Fig.28 It is a structural diagram of the curvature adjustment mechanism of variant example 4 of the present invention.

[0170] like Fig.28 As shown, in this modification, the base plate 40 is formed as a whole with the bottom plate 20, and its lower end is directly connected to the front end of the plug board 10. A sliding groove 221 is provided on the lower surface of the front side of the base plate 40, and the sliding groove 221 is located above the range limiting member 42. The structure of the sliding groove 221 is the same as the sliding groove 221 of the modification 2, and a blocking portion 2211 is also provided at its upper end.

[0171] An adjustment fitting portion 35 is provided at the lower end of the backing plate 30, and the position of the adjustment fitting portion 35 corresponds to the three slider limit surfaces 42A. In addition, groove fitting protrusions 351 for being embedded in the sliding groove 221 are also provided on the lower end of the backing plate 30 on the left and right sides of the adjustment fitting portion 35, so that the lower end of the backing plate 30 can slide in the sliding groove 221, and when it moves upward, it will be blocked by the blocking portion 2211 and cannot escape from the upper part of the sliding groove 221. That is, in this modified example, the lower end of the backing plate 30 is slidably disposed on the base plate 40.

[0172] When the range limiter 42 is slid left and right by toggling the slider paddle 425, one of the three slider limit surfaces 42A will be aligned with the adjustment fitting portion 35 in the longitudinal direction, so that when the lower end of the backrest plate 30 slides downward, the lower end of the backrest plate 30 can be limited by the abutment between one of the slider limit surfaces 42A and the adjustment fitting portion 35, thereby limiting the sliding distance range of the lower end of the backrest plate 30.

[0173] Compared with the fourth embodiment, this variation does not have a height adjustment mechanism, but can also achieve adjustment of the curvature variation range.

[0174] <Variation 5>

[0175] This modification is another modification of Example 4 based on Modification 4, and differs from Modification 4 in that it does not have a different mounting position of the range limiter 42. In this modification, the same reference numerals are given to the same structures as those of Example 4 and Modification 4, and the same descriptions are omitted.

[0176] Fig.29 It is a structural diagram of the curvature adjustment mechanism of variant example 5 of the present invention.

[0177] like Fig.29 As shown, in this modification, the base plate 40 is formed as a whole with the bottom plate 20, and its lower end is directly connected to the front end of the plug board 10. A sliding groove 221 is provided on the front lower surface of the base plate 40, and its structure is the same as the sliding groove 221 of modification 2, and a blocking portion 2211 is also provided at the upper end.

[0178] A groove engaging protrusion (not shown) is respectively provided on both sides of the lower end of the backing plate 30 , and the two groove engaging protrusions are respectively embedded in the two sides of the sliding groove 221 , so that the lower end of the backing plate 30 can slide up and down relative to the base plate 40 .

[0179] The lower end of the backing plate 30 is also provided with a sliding rod 37 extending left and right. The range limiting member 42 is a slider, which is sleeved on the sliding rod 37 so as to be able to slide left and right. The lower surface of the range limiting member 42 has a plurality of horizontal surfaces (specifically three in this embodiment) as slider limiting surfaces 42A. From left to right, the distances from these horizontal surfaces to the lower edge of the base plate 40 increase successively, and the slider limiting surfaces 42A are connected successively to form a step shape.

[0180] 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.

[0181] A stopper 48 is provided at the lower end of the base plate 40, below the sliding groove 221. When the user slides the range limiting member 42 left and right by toggling the slider paddle 426, one of the three slider limiting surfaces 42A will be aligned with the stopper 48 in the longitudinal direction, so that when the lower end of the support plate 30 slides downward, the lower end of the support plate 30 can be limited by the abutment between one of the slider limiting surfaces 42A and the stopper 48. Therefore, by toggling the slider paddle 426 to align different slider limiting surfaces 42A with the stopper 48, the sliding distance range of the lower end of the support plate 30 can be changed, thereby adjusting the curvature change range of the support plate 40.

[0182] <Example 5>

[0183] This embodiment is another variation of the 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 the embodiment 2, and the same descriptions are omitted.

[0184] Fig.30 It is a structural diagram of the curvature adjustment mechanism of Example 5 of the present invention.

[0185] like Fig.30As shown, in this embodiment, the range limiting member 42 is a limit screw, one end of which is provided with a handle 4201. A mounting member 4003 is fixedly provided on the lower front surface of the base plate 40, and 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.

[0186] The bottom wall 4005 is provided with a screw hole matched with the range limiting member 42, and the range limiting member 42 is screwed into the screw hole, and the handle 4201 is exposed below the mounting member 4003 and downwardly exposed 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 and right directions) is smaller than the horizontal dimension of the accommodating cavity 46A, so it can be located in the accommodating cavity 46A as a whole when installed.

[0187] 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, and 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), and can be embedded in the mounting member 4003. The accommodating portion 46 on both sides of the protrusion 461 is also provided with clearance holes 46C, and the two clearance holes 46C correspond to the left and right side walls 4004 of the mounting member 4003, respectively, and the left and right side walls 4004 can pass through the clearance holes 46C, respectively, so that the sliding member 41 can slide up and down relative to the mounting member 4003.

[0188] 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.

[0189] In the present embodiment, a limit screw is used as the range limiting member 42, and the upper end position of the limit screw is changed by screwing in and out, which is equivalent to a non-gear 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, the other end of each of the two guide strips is provided with a slot, 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.

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