Sponge cushion and seat

Abstract

The invention provides a sponge cushion and a seat. The sponge cushion comprises a main supporting part and an edge supporting part located on the periphery of the main supporting part. The sponge cushion comprises a lower surface and an upper surface which are oppositely arranged. The main supporting part and the edge supporting part are arranged between the lower surface and the upper surface. And a weight reduction structure is arranged on the main supporting part. Through the design of the weight reduction structure, the gram weight of the sponge cushion can be reduced, the cost can be reduced, the softness of a user after the user sits on the cushion can be enhanced, and the perception experience of the sitting comfort of the seat is improved.

Description

Technical Field

[0001] The present application relates to the technical field of furniture, and in particular to a sponge cushion and a seat. Background Art

[0002] With the development of the seating industry, the comfort requirements for seating are getting higher and higher, and structural improvements to improve the sitting feel of seating are emerging in an endless stream, covering changes in all aspects from internal filling materials to external covering layers. However, high-quality molded sponge materials that can strike a balance between comfort and cost are still relatively scarce. How to meet consumers' demand for high comfort while controlling production costs is still an important challenge facing manufacturers.

[0003] Therefore, it is necessary to design a sponge cushion and a seat that solves the above-mentioned technical problems. Summary of the invention

[0004] The present application provides a sponge cushion and seat furniture to improve comfort, breathability, and reduce cost and weight.

[0005] According to the first aspect of the embodiment of this specification, a sponge cushion is provided, which includes a main support portion and an edge support portion located outside the main support portion, the sponge cushion includes a lower surface and an upper surface arranged opposite to each other, the main support portion and the edge support portion are both arranged between the lower surface and the upper surface; a weight reduction structure is provided on the main support portion.

[0006] Furthermore, the upper surface includes a main support area corresponding to the main support portion and an edge support area corresponding to the edge support portion; the weight reduction structure is recessed relative to the edge support area, and the main support area is provided with a plurality of raised portions that are elevated relative to the weight reduction structure.

[0007] Furthermore, the weight-reducing structure is surrounded by the edge support area, and the multiple raised portions are multiple protrusions arranged in the weight-reducing structure; the multiple raised portions are independently arranged and arranged in a matrix in the main support area; the multiple raised portions are arranged along the left and right directions of the sponge cushion.

[0008] Furthermore, the tops of the plurality of protrusions are higher than the edge support area, and the plurality of protrusions and the edge support area together form a supporting curved surface protruding upward.

[0009] Furthermore, the tops of the plurality of protrusions are flush with the edge support area, and the plurality of protrusions and the edge support area together form a support plane.

[0010] Furthermore, the weight-reducing structure has four side surfaces, each of which is provided with a plurality of transition pits arranged at intervals, and each of the transition pits has a transition surface inclined inwardly relative to the edge support area.

[0011] Furthermore, the side surface of the weight-reducing structure is inclined, and a circular arc chamfer is provided at the connection between the weight-reducing structure and the edge support area; the raised portion has an inclined draft transition surface, and there is a circular arc transition between the raised portion and the weight-reducing structure.

[0012] Furthermore, the weight-reducing structure comprises a plurality of small pits, and the plurality of small pits are independently arranged and arranged in a matrix in the main support area; the protrusion is arranged between the plurality of small pits.

[0013] Furthermore, the lower surface includes a central area, a left area and a right area arranged in parallel along the front-to-back direction, and the weight-reducing structure is provided in plurality and is symmetrically arranged in the left area and the right area.

[0014] Furthermore, the central area is a non-weight reduction area, and the width of the central area is not greater than 80 mm.

[0015] Furthermore, the multiple weight-reducing structures have multiple shapes and are spaced apart from each other, and each of the weight-reducing structures has at least one hypotenuse inclined relative to the front-to-back direction and at least two straight edges arranged along the front-to-back direction or the left-to-right direction; the angle between the hypotenuse and the front-to-back direction is 45 degrees.

[0016] Furthermore, the lower surface also includes a left edge area, a right edge area, a front edge area and a rear edge area respectively located outside the left area and the right area; the left edge area, the right edge area, the rear edge area and the front edge area together form a closed annular edge area; the width of the left area and the right area is greater than the width of the center area.

[0017] Furthermore, the multiple weight-reducing structures are distributed in the left area and the right area in a dot matrix; and the multiple weight-reducing structures have the same shape.

[0018] Furthermore, the weight-reducing structure includes a bottom surface and a side surface; the connection between the side surface, the lower surface and the bottom surface is provided with an arc chamfer; the side surface is inclined relative to the lower surface, and the opening area of ​​the weight-reducing structure on the lower surface is larger than the area of ​​the bottom surface.

[0019] Furthermore, a thickened portion is provided at the front portion of the lower surface, and the width of the thickened portion is the same as the width of the sponge cushion; the thickened portion is of a structure that is high in the middle and low at the front and back, and the highest point of the thickened portion is arranged in the non-weight reduction area.

[0020] Furthermore, a weight-reducing structure is also provided in the central area, and the weight-reducing structure is symmetrically distributed relative to the midline of the sponge cushion.

[0021] Furthermore, part of the weight reduction structure is arranged across the three areas of the left area, the right area and the center area, and part of the weight reduction structure is only arranged in the left area or the right area; wherein the middle part of the weight reduction structure arranged across the three areas protrudes forward relative to the two sides.

[0022] Furthermore, the multiple weight-reducing structures include zigzag or wavy structures; the middle part of the weight-reducing structure arranged across three areas is a straight section and is arranged along the left and right directions, and the two sides are zigzag or wavy and are arranged to be inclined backward as a whole; the width of the straight section is greater than the width of the central area.

[0023] Furthermore, the weight-reducing structure arranged across three areas includes a two-stage linear structure, and the weight-reducing structure arranged only in the left area or the right area is a linear structure, and the linear structures are all inclined relative to the front-rear direction.

[0024] Furthermore, the material of the sponge cushion is molded sponge.

[0025] According to the second aspect of the embodiment of this specification, a seat is provided, comprising a seat frame and the sponge cushion described in the first aspect, wherein the seat frame is provided with a plurality of serpentine springs along the front-to-back direction, wherein one of the serpentine springs abuts against the middle of the main support portion.

[0026] The present application has the following beneficial effects: through the design of the weight-reducing structure, not only the weight of the sponge seat cushion can be reduced and the cost can be reduced, but also the softness after the user sits down can be enhanced, thereby improving the perceptual experience of the sitting comfort of the seat.

[0027] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0029] Figure 1 This is a schematic diagram of the first embodiment of the sponge cushion of the present application;

[0030] Figure 2 It is a cross-sectional view of the sponge cushion of the present application;

[0031] Figure 3 is a schematic diagram of a second embodiment of the sponge cushion of the present application;

[0032] Figure 4 is a schematic diagram of the third embodiment of the sponge cushion of the present application;

[0033] Figure 5 is a top view of the fourth embodiment of the sponge cushion of the present application;

[0034] Figure 6 yes Figure 5 A three-dimensional image of the middle sponge cushion;

[0035] Figure 7 It is a side view of the sponge cushion of the present application;

[0036] Figure 8 is a three-dimensional diagram of the fifth embodiment of the sponge cushion of the present application;

[0037] Fig. 9 is a three-dimensional diagram of the sixth embodiment of the sponge cushion of the present application;

[0038] Fig.10 is a three-dimensional diagram of the seventh embodiment of the sponge cushion of the present application;

[0039] Fig.11 is a three-dimensional diagram of the eighth embodiment of the sponge cushion of the present application;

[0040] Fig.12 It is a three-dimensional diagram of the ninth embodiment of the sponge cushion of the present application.

[0041] Description of reference numerals:

[0042] 10-lower surface; 101-central area; 102-left area; 103-right area; 104-left edge area; 105-right edge area; 106-front edge area; 107-rear edge area; 108-thickening portion;

[0043] 20-upper surface; 201-main support area; 202-edge support area;

[0044] 30, 31, 32, 33, 34, 35, 36-weight reduction structure; 301-side; 302-transition pit; 3021-transition surface; 303-bottom; 311-bevel; 312-straight edge; 313-bottom; 314-side; 315-arc chamfer; 341, 351-straight section; 342-broken line; 352-wavy.

[0045] 40, 41, 42-protrusions; 401, 411, 421-mold draft transition surfaces. DETAILED DESCRIPTION

[0046] Here, the technical solutions in the embodiments (or "implementations") of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0047] If there are terms involving directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0048] Next, the embodiments of this specification are described in detail.

[0049] Reference Figure 1 and Figure 2 As shown, the present application discloses a sponge cushion, which is applied to a seat and installed on the seat frame of the seat. The sponge cushion includes a lower surface 10 and an upper surface 20 arranged opposite to each other. The upper surface 20 is used to contact with a person's body, and the lower surface 10 is in contact with the seat frame of the seat. The rear side of the sponge cushion can be against the backrest of the seat. The sponge cushion includes a main support portion and an edge support portion located at the periphery of the main support portion, and the main support portion and the edge support portion are both arranged between the lower surface 10 and the upper surface 20, and a weight reduction structure 30 is provided on the main support portion.

[0050] According to different embodiments of the present application, the weight reduction structure 30 can be arranged only on the lower surface 10, only on the upper surface 20, or on both surfaces. The weight reduction structure 30 is arranged on the upper and lower surfaces of the sponge cushion and occupies a certain thickness, and the interior of the sponge cushion is still a solid structure.

[0051] The upper surface 20 includes a main support area 201 corresponding to the main support portion and an edge support area 202 corresponding to the edge support portion. The main support area 201 is provided with a weight reduction structure 30 sunken relative to the edge support area 202 and a plurality of protrusions 40 raised relative to the weight reduction structure 30 .

[0052] The weight-reducing structure 30 is square and has four side surfaces 301. The weight-reducing structure 30 occupies most of the upper surface 20 and is the main support area. The weight-reducing structure 30 is surrounded by edge support areas 202 to form a closed area, including four narrow and long areas corresponding to the four sides of the upper surface 20.

[0053] The four side surfaces 301 of the weight-reducing structure 30 are all inclined, and the side surfaces 301 are arranged at an obtuse angle with the bottom surface 303 of the weight-reducing structure 30. The connection between the weight-reducing structure 30 and the edge support area 202 is provided with a circular chamfer.

[0054] Please refer to Figure 3 As shown, according to another embodiment of the present application, the four side surfaces 301 are each provided with a plurality of transition pits 302 arranged at intervals, and the transition pits 302 each have a transition surface 3021 inclined inwardly relative to the edge support area 202 .

[0055] The inclined setting of the side surface 301 and the transition surface 3021 can avoid the difference in sitting feeling between the edge support area 202 and the main support area 201, avoid the pressure of the hard edge, and bring a softer support experience.

[0056] According to other embodiments of the present application, the weight-reducing structure 30 may also be circular, polygonal or other shapes.

[0057] The raised portions 40 and 41 are convex points disposed in the weight-reducing structure 30. Figure 1 The shape of the middle convex point is a frustum. The raised parts 40 and 41 have draft transition surfaces 401 and 411. The radial dimensions of the raised parts 40 and 41 gradually decrease from bottom to top. There is an arc transition between the raised parts 40 and 41 and the weight-reducing structure 30.

[0058] The raised portions 40 and 41 are independently arranged, arranged in a matrix in the main support area 201, and arranged along the left and right directions of the sponge cushion. The raised portions 40 and 41 have the same shape and are spaced the same distance apart along the front and back and left and right directions of the sponge cushion. The tops of the raised portions 40 and 41 are higher than the edge support area 202, and the plurality of raised portions 40 and 41 and the edge support area 202 together form a support curved surface with a central portion protruding upward. In the present application, the raised portions 40 and 41 are symmetrically arranged along the left and right directions of the sponge cushion.

[0059] According to the embodiment of the present application, the weight reduction structure 30 is only arranged on the upper part of the sponge cushion, and the lower part is a solid sponge with a certain thickness. The height of the protrusion 40 is 10mm-30mm, and the depth of the weight reduction structure 30 accounts for 15%-40% of the thickness of the sponge cushion.

[0060] In another embodiment, the tops of the plurality of protrusions are flush with the edge support area 202 , and the plurality of protrusions and the edge support area 202 together form a support plane.

[0061] In another embodiment, the tops of the plurality of protrusions are lower than the edge support area 202 , and the plurality of protrusions and the edge support area 202 together form a support curved surface with a downwardly concave middle portion.

[0062] The plurality of protrusions 40 and 41 are integrally formed on the sponge cushion to increase the structural stability of the sponge cushion.

[0063] In another embodiment, the sponge cushion and the raised portions 40 , 41 may also be formed separately, and then the raised portions 40 , 41 are adhered to the bottom surface 303 of the weight-reducing structure 30 .

[0064] The interval between the raised parts 40 and 41 helps to improve the air permeability and ventilation effect of the sponge cushion, prevent heat accumulation caused by long-term sitting, and keep the sponge cushion dry and comfortable. The arc chamfer and arc transition structure can fit the curve of the human body more naturally, reduce direct pressure on the human body, and provide a smoother and more comfortable contact experience.

[0065] Please refer to Figure 4 As shown, it is Figure 1 The difference between the embodiment is only the shape of the protrusion 42. The protrusion 42 has a draft transition surface 421.

[0066] According to other embodiments of the present application, the protrusions 40, 41, 42 may also be square bosses, spherical or sawtooth-shaped. The above shapes may be used on the sponge cushion alone or in combination.

[0067] In another embodiment not shown, the weight-reducing structure includes a plurality of small dimples, which are independently arranged and arranged in a matrix in the main support area. The small dimples are integrally formed on the sponge cushion, and the small dimples are recessed relative to the upper surface of the sponge cushion. The raised portion is arranged between the plurality of small dimples, on the upper surface of the original sponge cushion.

[0068] When the upper surface of the sponge cushion is a plane, when the top of the protrusion is flush with the edge support area, the multiple protrusions and the edge support area together form a support plane. When the upper surface of the sponge cushion is a curved surface, when the top of the protrusion is higher or lower than the edge support area, the multiple protrusions and the edge support area together form a support curved surface.

[0069] The present application adopts the design of the sunken weight-reducing structure 30, which not only reduces the weight of the sponge cushion and reduces the cost, but also solves the problem that the molded sponge seat feels too hard and solid, and can enhance the softness after the user sits down and improve the sitting comfort.

[0070] The present application forms a certain texture structure by staggering the sunken weight-reducing structure 30 and the raised parts 40, 41, 42. The texture features are added to the upper surface of the sponge seat cushion to ensure the comfort of the user for a short time, accelerate the flow of air, help dissipate the heat of long-term riding, and improve the sitting comfort of the seat.

[0071] Reference Figure 5 , Figure 6 and Figure 7 As shown, the lower surface 10 includes a central area 101, a left area 102 and a right area 103 arranged in parallel along the front-to-back direction. Figure 5 The weight reduction structure 31 is symmetrically arranged in the left area 102 and the right area 103 .

[0072] The widths of the left area 102 and the right area 103 are greater than the width of the central area 101 , and the weight-reducing structures 31 are symmetrically arranged in the left area 102 and the right area 103 to form two weight-reducing areas.

[0073] The lower surface 10 further includes a left edge region 104 and a right edge region 105 respectively located outside the left region 102 and the right region 103. The lower surface 10 further includes a front edge region 106 and a rear edge region 107. The front edge region 106 is disposed in front of the left region 102, the right region 103 and the center region 101. The rear edge region 107 is disposed in rear of the left region 102, the right region 103 and the center region 101. The rear edge region 107 and the front edge region 106 are respectively located at the front and rear sides of the lower surface 10.

[0074] The width of the front edge region 106 is the same as the width of the sponge cushion. The width of the rear edge region 107 is the same as the width of the sponge cushion, and the length of the front edge region 106 is greater than the length of the rear edge region 107. The widths of the left edge region 104 and the right edge region 105 are close to the width of the central region 101. The left edge region 104, the right edge region 105, the rear edge region 107 and the front edge region 106 together form a closed annular edge region.

[0075] Figure 5 In the figure, the central area 101, the left edge area 104, the right edge area 105, the rear edge area 107 and the front edge area 106 are all non-weight reduction areas. No weight reduction structure is set in these areas, and the sponge cushion has a uniform thickness, which can effectively ensure the structural strength at the edge.

[0076] According to one embodiment of the present application, the width of the central area 101 is no greater than 80 mm, and the length of the front edge area 106 is no greater than 75 mm.

[0077] The weight-reducing structure 31 includes a bottom surface 313 and a side surface 314. The side surface 314 is inclined relative to the lower surface 10, and arc chamfers 315 are provided at the connection between the side surface 314, the lower surface 10 and the bottom surface 313. The opening area of ​​the weight-reducing structure 31 on the lower surface 10 is larger than the area of ​​the bottom surface 313, that is, the weight-reducing structure 31 is a tapered structure. The inclined setting of the side surface 314 can facilitate injection molding and demolding, and the arc chamfers 315 can fit the curve of the human body more naturally. The two structures can reduce direct pressure on the human body and provide a smoother and more comfortable contact experience.

[0078] The weight-reducing structure 31 has multiple shapes and is arranged at intervals. Each shape of the weight-reducing structure 31 has at least one oblique side 311 inclined relative to the front-to-back direction and at least two straight sides 312 arranged along the front-to-back direction or the left-to-right direction. In the figure, the angle between the oblique side 311 and the front-to-back direction is 45 degrees.

[0079] Specifically, the weight reduction structure 31 includes a right triangle, a parallelogram and a trapezoid. The angles between the hypotenuse 311 of the right triangle and the trapezoid and the front-to-back direction are 45 degrees, and the angles between a set of opposite sides of the parallelogram and the front-to-back direction are also 45 degrees.

[0080] The front part of the lower surface 10 is provided with a thickened portion 108, and the width of the thickened portion 108 is the same as the width of the sponge cushion. The thickened portion 108 is in a structure that is high in the middle and low in the front and back, and the highest point of the thickened portion 108 is set in the non-weight reduction area. The thickened portion 108 is distributed in the front edge area 106 and a part of the area behind the front edge area 106. When the sponge cushion is placed on the seat, the thickened portion 108 makes the left sponge cushion present a sitting feeling of high front and low back.

[0081] Figure 8 In the fifth embodiment shown, the lower surface 10 includes a central area 101, a left area 102, a right area 103, a left edge area 104, a right edge area 105, a front edge area 106 and a rear edge area 107 which are consistent with the layout direction of the above embodiments.

[0082] The weight-reducing structures 32 are circular and distributed in a dot matrix in the left area 102 and the right area 103, that is, multiple weight-reducing structures 32 are arranged in rows along the front-to-back direction and the left-to-right direction. The weight-reducing structures 32 have the same spacing along the front-to-back direction and the left-to-right direction, and the weight-reducing structures 32 have the same shape. The weight-reducing structures 32 in two adjacent rows form an angle of 45 degrees with the front-to-back direction.

[0083] Fig. 9 In the sixth embodiment shown, the weight-reducing structures 33 are square and are distributed in a dot matrix in the left area 102 and the right area 103 , that is, the plurality of weight-reducing structures 33 are arranged in a row along the front-to-back direction and the left-to-right direction.

[0084] Fig.10 In the seventh embodiment shown, a weight reduction structure 34 is also provided in the central area 101. The weight reduction structure 34 is oriented relative to the midline of the sponge cushion (see FIG. Figure 6 The weight reduction structure 34 is symmetrically distributed along the dotted line in the figure. Part of the weight reduction structure 34 is arranged across the left area 102, the right area 103 and the central area 101, and part of the weight reduction structure 34 is arranged only in the left area 102 or the right area 103. The middle part of the weight reduction structure 34 arranged across the three areas protrudes forward relative to the two sides.

[0085] The weight-reducing structure 34 includes a zigzag structure. The middle portion of the weight-reducing structure 34 that spans three regions is a straight section 341 and is arranged along the left-right direction. The two sides are zigzag 342 and are tilted backward as a whole and form an angle of 45 degrees with the front-rear direction. The width of the straight section 341 is greater than the width of the central region 101.

[0086] Fig.11 In the eighth embodiment shown, a weight-reducing structure 35 is also provided in the central region 101, and the weight-reducing structure 35 is symmetrically distributed with respect to the midline of the sponge cushion. The weight-reducing structure 35 includes a wave-shaped structure, the middle portion of the weight-reducing structure 35 arranged across three regions is a straight section 351 and is arranged in the left-right direction, the two sides are wave-shaped 352 and are arranged to be tilted backward as a whole and form an angle of 45 degrees with the front-back direction, and the width of the straight section 351 is greater than the width of the central region 101.

[0087] Fig.12 In the ninth embodiment shown, a weight-reducing structure 36 is also provided in the central area 101, and the weight-reducing structure 36 is symmetrically distributed relative to the midline of the sponge cushion. The weight-reducing structure 36 includes a two-stage linear structure, and the weight-reducing structure 36 provided only in the left area 102 or the right area 103 is a linear structure, and the linear structures are all inclined relative to the front-rear direction and form an angle of 45 degrees with the front-rear direction.

[0088] The material of the sponge cushion is molded sponge, which is a soft porous material that increases the air permeability of the sponge cushion.

[0089] The weight-reducing structure provided in the present application reduces the weight and manufacturing cost of the sponge seat cushion; solves the problem of the molded sponge seat having a hard sitting feel, and can enhance the sitting comfort of the seat after sitting down.

[0090] The texture structure formed by the weight-reducing structures 31, 32, 33, 34, 35, and 36 of the present application can achieve uniform force and reduce initial hardness during support, further improving the comfort factor and enhancing the softness and wrapping feeling of the user after sitting down.

[0091] The present application also discloses a seat, comprising a sponge cushion and a seat frame. The seat frame is provided with a plurality of serpentine springs along the front-to-back direction, one of the serpentine springs abuts below the central area 101 , and the other serpentine springs are symmetrically arranged in the left area 102 and the right area 103 .

[0092] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A sponge cushion, characterized in that: It includes a main support part and an edge support part located outside the main support part. The sponge cushion includes a lower surface and an upper surface arranged opposite to each other. The main support part and the edge support part are both arranged between the lower surface and the upper surface. A weight reduction structure is provided on the main support part.

2. The sponge cushion according to claim 1, characterized in that: The upper surface includes a main support area corresponding to the main support portion and an edge support area corresponding to the edge support portion; the weight reduction structure is recessed relative to the edge support area, and a plurality of raised portions elevated relative to the weight reduction structure are provided in the main support area.

3. The sponge cushion according to claim 2, characterized in that: The weight-reducing structure is surrounded by the edge support area, and the multiple protrusions are multiple protrusions arranged in the weight-reducing structure; the multiple protrusions are independently arranged and arranged in a matrix in the main support area; the multiple protrusions are arranged along the left and right directions of the sponge cushion.

4. The sponge cushion according to claim 2, characterized in that: The tops of the plurality of protrusions are higher than the edge support area, and the plurality of protrusions and the edge support area together form a support curved surface protruding upward.

5. The sponge cushion according to claim 2, characterized in that: The tops of the plurality of protrusions are flush with the edge support area, and the plurality of protrusions and the edge support area together form a support plane.

6. The sponge cushion according to claim 2, characterized in that: The weight-reducing structure has four side surfaces, each of which is provided with a plurality of transitional recesses arranged at intervals, and each of the transitional recesses has a transitional surface inclined inwardly relative to the edge support area.

7. The sponge cushion according to claim 2, characterized in that: The side surface of the weight-reducing structure is inclined, and a circular arc chamfer is provided at the connection between the weight-reducing structure and the edge support area; the raised portion has an inclined draft transition surface, and a circular arc transition is formed between the raised portion and the weight-reducing structure.

8. The sponge cushion according to claim 2, characterized in that: The weight-reducing structure comprises a plurality of small pits, which are independently arranged and arranged in a matrix in the main support area; and the protrusions are arranged between the plurality of small pits.

9. The sponge cushion according to claim 1, characterized in that: The lower surface includes a central area, a left area, and a right area arranged in parallel along the front-to-back direction, and a plurality of weight-reducing structures are provided and symmetrically arranged in the left area and the right area.

10. The sponge cushion according to claim 9, characterized in that: The central area is a non-weight reduction area, and the width of the central area is not greater than 80 mm.

11. The sponge cushion according to claim 9, characterized in that: The multiple weight-reducing structures have multiple shapes and are spaced apart from each other. Each of the weight-reducing structures has at least one oblique edge inclined relative to the front-to-back direction and at least two straight edges arranged along the front-to-back direction or the left-to-right direction; the angle between the oblique edge and the front-to-back direction is 45 degrees.

12. The sponge cushion according to claim 9, characterized in that: The lower surface also includes a left edge area, a right edge area, a front edge area and a rear edge area respectively located outside the left area and the right area; the left edge area, the right edge area, the rear edge area and the front edge area together form a closed annular edge area; the width of the left area and the right area is greater than the width of the central area.

13. The sponge cushion according to claim 9, characterized in that: The multiple weight-reducing structures are distributed in the left area and the right area in a dot matrix; the multiple weight-reducing structures have the same shape.

14. The sponge cushion according to claim 9, characterized in that: The weight-reducing structure includes a bottom surface and a side surface; arc chamfers are provided at the connections between the side surface, the lower surface and the bottom surface; the side surface is inclined relative to the lower surface, and the opening area of ​​the weight-reducing structure on the lower surface is larger than the area of ​​the bottom surface.

15. The sponge cushion according to claim 9, characterized in that: A thickened portion is provided at the front of the lower surface, and the width of the thickened portion is the same as the width of the sponge cushion; the thickened portion is of a structure that is high in the middle and low at the front and back, and the highest point of the thickened portion is arranged in the non-weight reduction area.

16. The sponge cushion according to claim 9, characterized in that: A weight-reducing structure is also provided in the central area, and the weight-reducing structure is symmetrically distributed relative to the midline of the sponge cushion.

17. The sponge cushion according to claim 16, characterized in that: Some of the weight-reducing structures are arranged across the left area, the right area and the central area, and some of the weight-reducing structures are arranged only in the left area or the right area; The middle portion of the weight-reducing structure arranged across three regions protrudes forward relative to both sides.

18. The sponge cushion according to claim 17, characterized in that: The multiple weight-reducing structures include zigzag or wavy structures; the middle part of the weight-reducing structure arranged across three areas is a straight section and is arranged along the left and right directions, and the two sides are zigzag or wavy and are arranged to be inclined backward as a whole; the width of the straight section is greater than the width of the central area.

19. The sponge cushion according to claim 16, characterized in that: The weight-reducing structure arranged across three areas includes a two-stage linear structure, and the weight-reducing structure arranged only in the left area or the right area is a linear structure, and the linear structures are all inclined relative to the front-rear direction.

20. The sponge cushion according to claim 1, characterized in that: The material of the sponge cushion is molded sponge.

21. A seat, characterized in that: It comprises a seat frame and a sponge cushion as claimed in any one of claims 1 to 20, wherein a plurality of serpentine springs are arranged on the seat frame along the front-to-back direction, and one of the serpentine springs abuts against the middle of the main support portion.

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