Deformable backup plate and waist support

Abstract

The invention aims to provide a backup plate which can be better matched with the waist of a user in shape and can well support the waist, a backup plate body is made of a deformable material, the surface, corresponding to the waist of the user, of the backup plate body is a bearing surface, the bearing surface is a double-curved surface, and the double-curved surface is a double-curved surface. The longitudinal middle of the supporting surface protrudes towards the side of a user, the transverse middle of the supporting surface is sunken relative to the side of the user, when the waist of the user leans on the backup plate, the backup plate body is slightly elongated in the longitudinal direction, the two transverse sides of the backup plate body extend forwards, and in the state, the longitudinal curve of the supporting surface can be better matched with the physiological curve of the waist of the user; the supporting performance is improved; on the other hand, the two transverse side parts can also generate an enveloping feeling on the waist of the user, the use feeling is improved, and meanwhile the supporting performance can be further improved. The invention further provides a waist support comprising the backup plate.

Description

Technical Field

[0001] The invention relates to a deformable backrest plate and a waist support containing the deformable backrest plate. 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] Lumbar supports typically include a curved backrest to support the user's waist. However, these backrests typically have a simple curved surface that doesn't conform well to the user's waist shape, resulting in inadequate support. Furthermore, existing backrest cushions are often made of soft materials like sponge, which can deform when subjected to external forces. However, these cushions struggle to provide adequate support for the waist, resulting in poor support effectiveness and potentially leading to various lumbar spine problems after prolonged use. Summary of the Invention

[0004] In order to solve the above problems, a backrest plate that can better match the shape of the user's waist and provide good support for the waist and a lumbar support containing such a backrest plate are provided. The present invention adopts the following technical solutions.

[0005] The present invention provides a deformable backrest, which is arranged in a lumbar support to support the user's waist. The backrest includes a backrest body, and is characterized in that: the backrest body is made of a deformable material, and the surface of the backrest body corresponding to the user's waist is a supporting surface. The supporting surface is a hyperbolic surface, whose longitudinal middle portion is convex toward the user side and whose transverse middle portion is concave relative to the user side. The supporting surface is a hyperbolic surface within a space formed by the two sides of the characteristic curved surface being equidistant by 10 mm. The longitudinal centerline of the characteristic curved surface is a longitudinal characteristic curve. The function expression of the longitudinal characteristic curve is as follows:

[0006]

[0007] The unit of length in the above function expression is mm.

[0008] The deformable backrest provided by the present invention may also have the following technical features: the line connecting the two end points of the longitudinal characteristic curve is the characteristic section normal, the plane passing through the upper end point of the longitudinal characteristic curve and perpendicular to the characteristic section normal is the first characteristic surface, the curve formed by the intersection of the first characteristic surface and the characteristic curved surface is the transverse first characteristic curve, and the function expression of the transverse first characteristic curve is: The length unit in this function expression is mm; the plane parallel to the first characteristic surface and 100 mm away from the first characteristic surface is the second characteristic surface, and the curve where the second characteristic surface intersects the characteristic curved surface is the transverse second characteristic curve. The function expression of the transverse second characteristic curve is: The length unit in this function expression is mm; the plane parallel to the first characteristic surface and 200 mm away from the first characteristic surface is the third characteristic surface, and the curve where the third characteristic surface intersects the characteristic curved surface is the transverse third characteristic curve. The function expression of the transverse third characteristic curve is: The length unit in this function expression is mm; the plane passing through the lower end point of the longitudinal characteristic curve and perpendicular to the normal line of the characteristic section is the fourth characteristic surface, and the curve where the fourth characteristic surface intersects the characteristic curved surface is the transverse fourth characteristic curve. The function expression of the transverse fourth characteristic curve is: The unit of length in this function expression is mm.

[0009] The deformable backrest provided by the present invention may also have the following technical features: the lateral span of the characteristic curved surface is 420 mm, the longitudinal span is 326 mm, the lateral span of the supporting surface is 300 mm to 420 mm, and the longitudinal span is 220 mm to 326 mm.

[0010] Furthermore, the deformable backrest provided by the present invention may also have such technical features, wherein the middle lateral span of the supporting surface is greater than the lateral spans of the upper and lower ends, the middle lateral span of the supporting surface is 340mm~420mm, the span width of the upper edge of the supporting surface is 240mm-320mm, and the span width of the lower edge of the supporting surface is 170mm-250mm.

[0011] In addition, the deformable backrest provided by the present invention may also have such technical features, wherein the backrest body has multiple central hollow portions and multiple side hollow portions, the central hollow portion extends along the transverse direction, and the multiple central hollow portions are arranged in the middle of the backrest body along the longitudinal direction, and the side hollow portions are symmetrically distributed on both sides of the backrest body.

[0012] The deformable backrest provided by the present invention may also have the following technical features: the deformable material is engineering plastic.

[0013] The deformable backrest provided by the present invention may also have the following technical features: the thickness of the backrest body is 3mm-5mm.

[0014] The present invention also provides a lumbar support, characterized in that it includes: a deformable backrest for supporting the user's waist; and a base plate for installing the deformable backrest, wherein the deformable backrest is a deformable backrest as described in any of the above items, the upper end of the deformable backrest is rotatably connected to the base plate, and the lower end is movably abutted against the base plate.

[0015] Functions and effects of the invention

[0016] According to the deformable backrest and lumbar support provided by the present invention, since the supporting surface of the backrest body is a specific hyperbolic surface, its longitudinal middle part is convex toward the user side and the lateral middle part is concave relative to the user, and the backrest body is made of deformable material, therefore, when the user leans his waist against the backrest, the backrest can undergo a certain degree of overall deformation with external force; this overall deformation will cause the backrest body to slightly stretch in the longitudinal direction and the lateral side parts to extend forward. On the one hand, in this state, the longitudinal curve of the supporting surface, especially the curve of the longitudinal middle part, can better adapt to the physiological curve of the user's waist, thereby improving the support; on the other hand, the lateral side parts can also produce a sense of enveloping the user's waist, which can enhance the use experience while also further improving the support. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the front angle of the lumbar support according to an embodiment of the present invention;

[0018] Figure 2 This is a structural diagram of the rear angle of the lumbar support according to an embodiment of the present invention;

[0019] Figure 3 This is a structural diagram of a support plate according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the spatial range formed by equidistant characteristic surfaces according to an embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of a characteristic curved surface at an oblique rear angle according to an embodiment of the present invention;

[0022] Figure 6 is a schematic diagram of a characteristic curved surface at a side angle according to an embodiment of the present invention;

[0023] Figure 7 Schematic diagram of the projection of the characteristic curved surface and the backing plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention provides a deformable backrest and a lumbar support incorporating the deformable backrest. The 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 the front-to-back, up-down, and left-to-right directions are based on the user sitting in the automobile seat.

[0025] <Example>

[0026] Figure 1 This is a structural diagram of the front angle of the lumbar support of an embodiment of the present invention. Figure 2 2 is a structural diagram of the rear angle of the lumbar support according to an embodiment of the present invention.

[0027] like Figure 1-2 As shown, this embodiment provides a lumbar support 100 , which includes an inserting plate 10 , a bottom plate 20 , and a deformable back plate (hereinafter referred to as back plate) 30 .

[0028] 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.

[0029] The lower end of the base plate 20 is hingedly connected to the front end of the plugboard 10. In this embodiment, the base plate 20 is generally rectangular, with its lower end (i.e., the lower short side) pivotally connected to the front end of the plugboard 10 via a hinge structure. Alternatively, in other embodiments, the lower end of the base plate 20 may be pivotally connected to the plugboard 10 via other connection structures, or may be fixedly connected to the plugboard 10, or may be integrally formed with the plugboard 10.

[0030] In this embodiment, the bottom plate 20 serves as a substrate for installing the back plate 30; as an alternative, in other embodiments, the back plate 30 may also be installed on an independent substrate, which may be fixedly or movably installed on the bottom plate 20 to serve the purpose of installing the back plate 30.

[0031] The backrest 30 is used to support the waist of the user. In this embodiment, the backrest 30 is made of engineering plastics, which can be deformed to a certain extent and has a certain toughness. As an alternative, the backrest 30 can also be made of other materials with similar properties.

[0032] Figure 3 2 is a structural diagram of a support plate according to an embodiment of the present invention.

[0033] like Figure 3 As shown, the backrest 30 includes a backrest body 31 , a hinge portion 32 , and an abutting portion 33 .

[0034] Among them, the hinge part 32 is set at the upper rear side of the backrest body 31, and is used to be rotatably connected to the upper part of the base plate 20. Its specific hinge position is the upper end of the base plate 20, and the rotation axis is roughly along the horizontal direction.

[0035] The abutment portion 33 is provided at the rear lower portion of the backboard body 32 for abutting against the lower end portion of the base plate 20 , so that the lower end of the backboard 30 rests on the base plate 20 and is movable relative to the base plate 20 .

[0036] The back plate body 31 is an integrally formed plate-shaped component with a uniform overall thickness of 4 mm. The back plate body 31 is made of a deformable material with a certain hardness, such as engineering plastic. In this embodiment, the material of the back plate body 31 is PP.

[0037] Since the backrest 30 is deformable and its upper end is rotatably connected to the upper end of the base plate 20 through the hinge part 32, and the lower end of the backrest 30 is movably abutted against the base plate 20 through the abutment part 33, once the backrest body 31 is subjected to external force (for example, the user's waist leans from the front to the back, and the force of the waist is applied to the backrest body 31), the backrest body 31 can be deformed.

[0038] In this embodiment, the backrest body 31 has a specific shape and structure, so that it can better match the shape of the user's waist when in use and provide good support for the waist, which is described in detail below with reference to the accompanying drawings.

[0039] The backrest body 31 is provided with multiple central hollow sections 311 and multiple side hollow sections 312. Each central hollow section 311 extends horizontally and is arranged longitudinally in the center of the backrest body 31. The side hollow sections 312 are symmetrically distributed on either side of the backrest body 31, extending from a position near the center of the backrest body 31 to the edges of the backrest body 31, forming a plurality of ribs on either side of the backrest body 31. Furthermore, several spaced hollow sections 313 are provided between the central hollow section 311 and the side hollow sections 312, extending generally longitudinally. In this embodiment, based on such a middle hollow portion 311, a side hollow portion 312 and an interval hollow portion 313, the backrest body 31 can have a certain strength and easily produce appropriate deformation after being subjected to external force; in addition, these hollow structures can also play a certain role in saving materials and ventilation.

[0040] Figure 2-3 What is shown is the shape of the support plate body 31 when it is not subjected to external forces. Figure 2-3As shown, when the backrest body 31 is not subjected to external force, it presents a hyperbolic shape, that is, the longitudinal middle portion of the backrest body 31 protrudes toward the front side (user side), and the transverse middle portion protrudes toward the rear side (that is, it is recessed relative to the user side). Such a shape also makes the front side surface of the backrest body 31 form a hyperbolic surface, that is, the longitudinal middle portion protrudes toward the user side, and the transverse middle portion is recessed relative to the user side. Since the backrest body 31 of this embodiment has a uniform thickness, the shape of the front side surface is consistent with that of the rear side surface, and the front side surface, as a side surface facing the user, plays the role of supporting the user's waist, that is, it is a supporting surface. Therefore, the shape characteristics of the hyperbolic surface of this embodiment will be specifically described below using the front side surface as an example. In the following description, the supporting surface is regarded as a complete surface, that is, since the backrest body 31 is provided with the middle hollow portion 311, the side hollow portion 312, and the spacing hollow portion 313, its actual front side surface also has corresponding depressions and hollow parts, but when describing its shape, these depressions and holes are regarded as not existing.

[0041] In this embodiment, the supporting surface is a hyperbolic surface with a specific geometric shape, and its shape can be described using a virtual characteristic curved surface α as a reference.

[0042] Figure 4 is a schematic diagram of the spatial range formed by isometric characteristic surfaces in an embodiment of the present invention. Figure 5 is a schematic diagram of a characteristic curved surface at an oblique rear angle according to an embodiment of the present invention, Figure 6 Schematic diagram of the characteristic curved surface at a side angle of an embodiment of the present invention.

[0043] exist Figure 4-6 In order to clearly show various reference curves and reference surfaces, the middle hollow portion 311, the side hollow portions 312 and the interval hollow portions 313 are omitted.

[0044] like Figure 4-6As shown, the supporting surface is a hyperbolic surface within the spatial range formed by the characteristic surface α with an inner and outer distance of 10 mm. The characteristic surface α itself is also a hyperbolic surface with an edge. The inner and outer distance of the characteristic surface α is 10 mm, which means that each point on the characteristic surface α is moved 10 mm to both sides along the normal direction to form two surfaces located on both sides of the characteristic surface. These two surfaces are the two 10 mm equidistant surfaces β and γ of the characteristic surface. By connecting the corresponding points on the edges of the two 10 mm equidistant surfaces β and γ (that is, the two points on the two surfaces corresponding to the same point on the original edge of the characteristic surface), an edge surface δ connected to the edges of the two 10 mm equidistant surfaces can be formed. The space enclosed by the edge surface δ and the two 10 mm equidistant surfaces β and γ is the spatial range formed by the inner and outer distance of the characteristic surface α with an inner and outer distance of 10 mm. The supporting surface is a hyperboloid entirely within this spatial range. Preferably, it is a continuous hyperboloid within this range (i.e., there are no portions of the surface where the curvature suddenly increases or decreases). Most preferably, it is a hyperboloid within this range that coincides with the characteristic curved surface α. In other words, in the most preferred case, the supporting surface is a portion of the characteristic curved surface α.

[0045] The geometric shape characteristics of the characteristic surface are described in detail below with reference to the accompanying drawings.

[0046] The characteristic surface α is actually a hyperboloid whose overall size is larger than the supporting surface. The specific geometric shape of the characteristic surface α can be represented by several representative curves on the surface, as follows:

[0047] like Figure 5 As shown, the left half of the characteristic surface α is symmetrical to the right half. The longitudinal midline a1 of the characteristic surface α is the longitudinal characteristic curve. The function expression of the longitudinal characteristic curve a1 is as follows:

[0048]

[0049] The unit of length in the above function expression is mm. In addition, the unit of length in each of the following function expressions is also mm.

[0050] like Figure 5 As shown, the coordinate system corresponding to x and y in the above function expressions does not correspond to the real-world coordinate system x' and y' when the backrest 30 is in use, but rather to a coordinate system with a certain inclination angle. The same applies to the following functional expressions of various curves, which are used only to represent their shapes and have no relation to the real-world coordinate system. That is, x and y in each expression do not represent the x' and y' axes of the real-world coordinate system, and the use of the same x and y symbols in different expressions does not mean that these curves are in the same spatial coordinate system.

[0051] like Figure 5 、 Figure 6As shown, the line connecting the two end points of the longitudinal characteristic curve a1 is the characteristic section normal a2, the plane passing through the upper end point of the longitudinal characteristic curve a1 and perpendicular to the characteristic section normal a2 is the first characteristic surface ε, and the curve where the first characteristic surface ε intersects with the characteristic surface α is the transverse first characteristic curve b1. The function expression of the transverse first characteristic curve b1 is:

[0052] The plane parallel to the first characteristic surface ε and 100 mm away from the first characteristic surface ε is the second characteristic surface ζ. The curve where the second characteristic surface ζ intersects with the characteristic curved surface α is the transverse second characteristic curve b2. The function expression of the transverse second characteristic curve b2 is:

[0053] The plane parallel to the first characteristic surface ε and 200 mm away from the first characteristic surface ε is the third characteristic surface η. The curve where the third characteristic surface η intersects the characteristic curved surface α is the transverse third characteristic curve b3. The function expression of the transverse third characteristic curve b3 is:

[0054] The plane passing through the lower end point of the longitudinal characteristic curve a1 and perpendicular to the characteristic section normal a2 is the fourth characteristic surface θ. The curve where the fourth characteristic surface θ intersects with the characteristic curved surface α is the fourth transverse characteristic curve b4. The function expression of the fourth transverse characteristic curve b4 is:

[0055] Figure 7 Schematic diagram of the projection of the characteristic curved surface and the backing plate according to an embodiment of the present invention.

[0056] The plane where the longitudinal characteristic curve a1 is located is taken as the longitudinal median plane, and the vertical plane perpendicular to the longitudinal median plane and passing through the characteristic section normal a2 is taken as the projection plane. The projection plane is actually also Figure 6 The vertical plane is perpendicular to the paper surface and passes through the characteristic section normal a2. Project the characteristic curved surface α and the support plate body 31 on the projection plane, and we get Figure 7 In addition, the projections of the longitudinal characteristic curve a1 and the characteristic cross-section normal a2 form the same straight line segment, namely the central longitudinal straight line segment a1 (a2).

[0057] like Figure 7As shown, in this embodiment, the projection of characteristic curved surface α on the aforementioned projection plane is rectangular, with a transverse span (i.e., the length of the projection in the left-right direction) of 420 mm. In fact, since each transverse characteristic curve b1, b2, b3, and b4 is perpendicular to the longitudinal median plane and the vertical plane containing the characteristic cross-section normal a2, this transverse span is also the length of the line connecting the left and right endpoints of each transverse characteristic curve b1, b2, b3, and b4. Furthermore, the longitudinal span (i.e., the length of the projection in the vertical direction) of the projection of characteristic curved surface α on the aforementioned projection plane is 326 mm, which is also the length of the line connecting the two endpoints of longitudinal characteristic curve a1.

[0058] The entire projection surface of the supporting surface is located within the projection surface of the characteristic curved surface α. In this embodiment, the lateral span of the middle part of the supporting surface is greater than the lateral spans of the upper and lower ends, presenting an effect of being wide in the middle and narrow at the top and bottom; based on the largest part of the projection in the left-right direction, the lateral span of the supporting surface is 300mm-420mm, preferably 380mm. This lateral span is also the length of the line connecting the endpoints of the widest part of the supporting surface in the left-right direction. Based on the projection size of the edge in the left-right direction, the span width of the upper edge of the supporting surface is 240mm-320mm, preferably 280mm; the span width of the lower edge of the supporting surface is 170mm-250mm, preferably 220mm. In addition, based on the largest part of the projection in the up-down direction, the longitudinal span of the supporting surface is 220mm-326mm, preferably 290mm.

[0059] like Figure 1-2 As shown, in this embodiment, a cushion 301 is further provided on the front side of the backrest 30. The shape of the rear surface of the cushion 301 is consistent with the shape of the supporting surface, and the cushion 301 is detachably connected to the supporting surface by a hook and loop fastener, or fixedly connected to the supporting surface by an adhesive. The thickness of the cushion 301 is basically consistent at all places, so the shape of its front surface is also basically consistent with the shape of the supporting surface. Therefore, when the backrest 30 is deformed in use, the cushion 301 can also be deformed together. In addition, the front surface of the cushion 301 is also provided with a "Y"-shaped groove 302 extending from the upper end to the lower end. The groove 302 is conducive to the deformation of the cushion 301 and prevents the shape of the cushion 301 from poorly fitting with the backrest body 31. In addition, such a groove 302 can also allow air to circulate, making it more breathable, thereby improving the user experience.

[0060] Functions and Effects of the Embodiments

[0061] In this embodiment, since the backrest body is a hyperbolic shape, the supporting surface is a specific hyperbolic surface, the longitudinal middle part thereof is convex toward the user side, and the lateral middle part is concave relative to the user, and the backrest body is made of deformable material. Therefore, when the user leans his waist against the backrest, the backrest can undergo a certain degree of overall deformation with external force; this overall deformation will cause the backrest body to slightly stretch in the longitudinal direction and the lateral side parts to extend forward. On the one hand, in this state, the longitudinal curve of the supporting surface, especially the curve of the longitudinal middle part, can better adapt to the physiological curve of the user's waist, thereby improving the support; on the other hand, the lateral side parts can also produce a sense of enveloping the user's waist, which can enhance the use experience while further improving the support.

[0062] Since the backrest body is a plate-shaped structure integrally formed of engineering plastics such as PP, it has a certain hardness and can provide sufficient support to the user's waist while being deformable.

[0063] Furthermore, since the upper end of the backrest body is hinged to the base plate and the lower end is movable relative to the base plate, the backrest body can be ensured to deform to a sufficient extent when subjected to force, thereby better adapting to the waist curves of different users.

[0064] In the embodiment, since the supporting surface is a hyperbolic surface within the space formed by the characteristic curved surface with an equal distance of 10 mm inside and outside, its shape is similar to or substantially the same as the characteristic curved surface, and the function expression of the longitudinal characteristic curve (i.e., the longitudinal center line) in the characteristic curved surface is: In other words, the longitudinal characteristic curve has a relatively larger radius of curvature at the top and a smaller radius at the bottom. Accordingly, the support surface also exhibits a shape with a relatively larger radius of curvature at the top and a smaller radius at the bottom. The upper portion of the support surface aligns with the thoracic vertebrae of the user's spine, thus better conforming to the physiological curve of the human waist and providing better support. After repeated human body contact testing and comprehensive analysis and evaluation, a support plate body that conforms to or approximates the longitudinal characteristic curve of this embodiment exhibits greater comfort and support.

[0065] Furthermore, since the function expressions of the first transverse characteristic curve, the second transverse characteristic curve, the third transverse characteristic curve, and the fourth transverse characteristic curve of the characteristic surface are respectively That is to say, the curvature of the transverse curve in the middle part of the characteristic curved surface is greater than the curvature of the transverse curve in the upper and lower parts. On the one hand, such a shape can better match the physiological feature of the human body's physiological structure, that is, the curvature in the middle part of the waist is greater, thereby better fitting the user's waist. On the other hand, it can also make the lateral sides deform better when subjected to force, and more effectively create a sense of enveloping the user's waist.

[0066] In addition, in the embodiment, since the middle hollow part, the side hollow part and the interval hollow part are provided, the longitudinal force-bearing part of the backrest body is retained, which can easily produce appropriate deformation after being subjected to external force while having a certain strength; in addition, these hollow structures can also play a certain role in saving materials and ventilation.

[0067] The above embodiments are merely used to illustrate specific implementations of the present invention, and the deformable backrest and lumbar support of the present invention are not limited to the scope described in the above embodiments.

[0068] For example, in the embodiment, the thickness of the backrest body is uniform throughout, so that the shape of the supporting surface and the rear surface are consistent. In other embodiments, the thickness of the backrest body can also be uneven, as long as the supporting surface conforms to the curved features described in the above embodiments, it can play a basically similar deformation and support role. In addition, in the embodiment, the thickness of the cushion is also basically uniform throughout, but in other embodiments, the thickness of the cushion can also be not completely uniform throughout, as long as its rear surface matches the supporting surface and can deform with the backrest body when subjected to force.

[0069] In the embodiment, the backrest body is provided with a middle hollow portion, a side hollow portion and an interval hollow portion. In other embodiments, these hollow portions may be appropriately reduced or increased, or no hollow portion may be provided.

[0070] In the embodiment, the upper end of the backrest body is hinged to the base plate via a hinge, and the lower end abuts against the base plate via an abutment. In other embodiments, the hinge and abutment positions may be interchanged, or the backrest may be installed in other ways, as long as the backrest body is prevented from separating from the base plate (or substrate) while leaving room for deformation and movement. For example, as a preferred solution, in other embodiments, a protrusion may be provided on the abutment, and a groove extending vertically and capable of accommodating the protrusion may be provided on the base plate (or substrate), thereby limiting the sliding direction of the abutment while preventing the abutment from separating from the base plate.

Claims

1. A deformable backrest, arranged in a waist support to support the waist of a user, comprising a backrest body, characterized in that: in, The backing plate body is made of a deformable material. The surface of the backrest body corresponding to the waist of the user is a supporting surface, which is a hyperbolic surface, the longitudinal middle portion of which is convex toward the user side and the transverse middle portion is concave relative to the user side. The supporting surface is a hyperbolic surface in a space formed by the two sides of the characteristic curved surface being equidistant by 10 mm. The longitudinal midline of the characteristic curved surface is a longitudinal characteristic curve, and the function expression of the longitudinal characteristic curve is as follows: The unit of length in the above function expression is mm.

2. The deformable backing plate according to claim 1, characterized in that: in, The line connecting the two end points of the longitudinal characteristic curve is the characteristic section normal line. The plane passing through the upper end point of the longitudinal characteristic curve and perpendicular to the normal line of the characteristic section is the first characteristic surface. The curve where the first characteristic surface intersects with the characteristic curved surface is the transverse first characteristic curve. The function expression of the transverse first characteristic curve is: x∈[-210,210], the length unit in the function expression is mm; The plane parallel to the first characteristic surface and 100 mm away from the first characteristic surface is the second characteristic surface, and the curve where the second characteristic surface intersects with the characteristic curved surface is the transverse second characteristic curve. The function expression of the transverse second characteristic curve is: x∈[-210,210], the length unit in the function expression is mm; The plane parallel to the first characteristic surface and 200 mm away from the first characteristic surface is the third characteristic surface, and the curve where the third characteristic surface intersects with the characteristic curved surface is the transverse third characteristic curve. The function expression of the transverse third characteristic curve is: x∈[-210,210], the length unit in the function expression is mm; The plane passing through the lower end point of the longitudinal characteristic curve and perpendicular to the normal line of the characteristic section is the fourth characteristic surface. The curve where the fourth characteristic surface intersects with the characteristic curved surface is the transverse fourth characteristic curve. The function expression of the transverse fourth characteristic curve is: x∈[-210,210], the length unit in the function expression is mm.

3. The deformable backing plate according to claim 2, characterized in that: in, The characteristic curved surface has a lateral span of 420 mm and a longitudinal span of 326 mm. The lateral span of the supporting surface is 300mm-420mm, and the longitudinal span is 220mm-326mm.

4. The deformable backing plate according to claim 3, characterized in that: in, The lateral span of the middle portion of the support surface is greater than the lateral spans of the upper and lower ends, The lateral span of the middle part of the supporting surface is 340mm-420mm, The span width of the upper edge of the supporting surface is 240mm-320mm, and the span width of the lower edge of the supporting surface is 170mm-250mm.

5. The deformable backing plate according to claim 1, characterized in that: in, The backboard body has a plurality of middle hollow parts and a plurality of side hollow parts. The middle hollow portion extends in the transverse direction, and a plurality of the middle hollow portions are arranged in the middle of the back plate body in the longitudinal direction. The side hollow parts are symmetrically distributed on both sides of the backing plate body.

6. The deformable backing plate according to claim 1, characterized in that: in, The deformable material is engineering plastic.

7. The deformable backing plate according to claim 1, characterized in that: in, The thickness of the backing plate body is 3mm-5mm.

8. A lumbar support, characterized in that: include: A deformable backrest for supporting the user's waist; as well as A base plate, used for mounting the deformable backing plate, Wherein, the deformable backing plate is the deformable backing plate as described in any one of claims 1 to 7, the upper end of the deformable backing plate is rotatably connected to the base plate, and the lower end is movably abutted against the base plate.

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