Child seats and cushion structures

Abstract

To provide a child seat and a cushion structure capable of dealing with a child growth and absorbing impacts with a simple structure.SOLUTION: The child seat comprises: a seat body (3) having a seat and a backrest; and a cushion structure (4) detachably fitted to a corner formed by the seat and the backrest. The cushion structure (4) can take a first form in which a back and a hip of a child laid on back is supported at an angle near horizontal from below during normal use (FIG. 4(A)), and a second form deformed flat along the backrest so as to receive a load when the load of suddenly moving the child toward the backrest is applied (FIG. 4(B)).SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a child seat and a cushion structure. [Background technology]

[0002] Generally, when a child under the age of one who is not yet able to hold his / her head up is placed in a child car seat, the child is placed nearly on his / her back, facing backward in relation to the direction of travel of the vehicle, and secured in the child car seat with a belt. In this state, if the child is hit from the front due to an accident or sudden braking, the reaction force will move the child forward, and in an attempt to restrain this movement, the impact will be concentrated on the child's shoulders via the shoulder belt.

[0003] Furthermore, examples of child seats with a structure that can absorb impacts from the front include those disclosed in Patent Publication No. 2009-161010 (Patent Document 1), Patent Publication No. 2003-63291 (Patent Document 2), Patent Publication No. 2004-217038 (Patent Document 3), and Patent Publication No. 2008-184133 (Patent Document 4).

[0004] Patent Document 1 discloses that an angle changer that deforms in a direction to reduce the backrest angle absorbs impact. Patent Documents 2 and 3 disclose that when an impact is applied, the back part rotates in an upright direction and the impact is absorbed by an impact absorbing member. Patent Document 4 discloses that when an impact is applied, a rod connected to a link arm moves in conjunction with the rotation of the link arm. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-161010 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-63291 [Patent Document 3] Japanese Patent Application Laid-Open No. 2004-217038 [Patent Document 4] Japanese Patent Application Laid-Open No. 2008-184133 Summary of the Invention [Problem to be solved by the invention]

[0006] The corner modification section in Patent Document 1 is fixed to the child car seat and is therefore not adapted to accommodate the growth of the child. In addition, the child car seats in Patent Documents 2 to 4 have a complex structure as they use multiple members to absorb impacts.

[0007] The present invention has been made to solve the above-mentioned problems, and its object is to provide a child seat and cushion structure that can accommodate a child's growth and absorb impact with a simple structure. [Means for solving the problem]

[0008] A child seat according to one embodiment of the present invention comprises a seat body having a seat portion and a backrest portion, and a cushion structure including a support surface that supports the back and buttocks of a child lying on its back from below and that is detachably attached to the corner portion formed by the seat portion and the backrest portion, and the cushion structure includes an impact-absorbing cushion body having a first cushion body extending in a direction perpendicular to the support surface and a second cushion body extending in the same direction as the first cushion body and having cushioning properties different from those of the first cushion body.

[0009] Preferably, the first cushion body and the second cushion body extend linearly in the front-rear direction.

[0010] Preferably, the first cushion body and the second cushion body differ in at least one of hardness and shape.

[0011] Preferably, the first cushion body and the second cushion body are triangular in vertical cross section.

[0012] Preferably, the cushion structure further includes a housing that surrounds the surfaces of the shock absorbing cushion body other than the support surface.

[0013] A child seat according to one embodiment of the present invention comprises a seat body having a seat portion and a backrest portion, and a cushion structure that is removably attached to the corner portion formed by the seat portion and the backrest portion. During normal use, the cushion structure can take two forms: a first form in which it supports the back and buttocks of a child lying on their back from below at an angle close to horizontal, and a second form in which it deforms flat along the backrest portion to receive the load when a load is applied that moves the child suddenly toward the backrest portion.

[0014] Preferably, the cushion structure includes a support surface that supports the back and buttocks of a child lying on their back from below at an angle close to horizontal, and in the first form, the thickness from the intersection of the backrest and seat to the support surface is 70 mm or more.

[0015] Preferably, the load is 10 kg or more, and in the second form, the thickness from the intersection of the backrest and seat to the support surface is 45 mm or less.

[0016] Preferably, the angle of the support surface is 20° or less with respect to the horizontal plane.

[0017] Preferably, the cushion structure includes a shock absorbing cushion body having a support surface, and a housing surrounding the surface of the shock absorbing cushion body other than the support surface.

[0018] Preferably, the housing has a harder hardness than the shock absorbing cushion.

[0019] Preferably, the seat further comprises a waist belt for restraining the waist of a child seated on the seat body, and a crotch belt for restraining the crotch of a child seated on the seat body, and the housing has a pair of waist belt guide grooves on its side surfaces through which the waist belt passes, and a crotch belt guide groove on its front surface through which the crotch belt passes.

[0020] A cushion structure according to one embodiment of the present invention is a cushion structure that is detachably attached to a corner portion formed by the seat and backrest of a child car seat, and the cushion structure has a seat contact surface that contacts the seat, a back contact surface that contacts the backrest, and a support surface that supports the back and buttocks of a child lying on their back from below with a flat surface.During normal use, the cushion structure can take a first form in which it supports the back and buttocks of a child lying on their back from below at an angle close to horizontal, and a second form in which, when a load is applied that moves the child suddenly toward the backrest, it deforms flat along the backrest to receive the load. [Effects of the Invention]

[0021] The child car seat and cushion structure of the present invention can accommodate the growth of a child and can absorb impacts with a simple structure. [Brief explanation of the drawings]

[0022] [Figure 1] 1A and 1B are diagrams showing a child car seat according to the present embodiment, in which (A) shows the state in which the cushion structure is attached and the car is facing backward, (B) shows the state in which the cushion structure is removed and the car is facing backward, and (C) shows the state in which the car is facing forward. [Figure 2] 1 is a perspective view of a cushion structure according to an embodiment of the present invention; [Figure 3] 1A and 1B are exploded perspective views of a cushion structure according to an embodiment of the present invention, in which (A) shows a housing, (B) shows a shock-absorbing cushion body, and (C) shows first and second cushion bodies. [Figure 4] 1A and 1B are diagrams showing the state in which the cushion structure is attached and facing backward, where (A) shows the state in which no impact is applied, and (B) shows the state in which an impact is applied. [Figure 5] (A) is an enlarged view of FIG. 4(A), and (B) is an enlarged view of FIG. 4(B). DETAILED DESCRIPTION OF THE INVENTION

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in which like reference numerals denote like or corresponding parts and will not be described repeatedly.

[0024] (About the child seat) A child car seat 1 according to an embodiment of the present invention will be described with reference to Figure 1. In the description of the child car seat 1, the front-to-rear direction corresponds to the front-to-rear direction of the child car seat 1, and the left-to-right direction corresponds to the left-to-right direction when the seat of the child car seat 1 is viewed from the front.

[0025] The child car seat 1 according to this embodiment is a device that is placed on a vehicle seat to allow children such as infants and small children to ride safely. The child car seat 1 comprises a base body 2 and a seat body 3. The base body 2 is placed on the vehicle seat. The base body 2 comprises a vertical portion that contacts the backrest of the seat and a horizontal portion that contacts the seat of the seat. The seat body 3 is attached to the upper side of the base body 2 and is supported rotatably relative to the base body 2. The seat body 3 is fixed at least in the rear-facing and forward-facing positions.

[0026] A child sits on the seat body 3. To this end, the seat body 3 has a seat portion 31 that supports the child's bottom, and a backrest portion 32 that rises from the rear of the seat portion 31 and supports the child's back. The angle between the seat portion 31 and the backrest portion 32 is fixed, and the angle of the backrest portion 32 relative to the seat portion 31 is, for example, 80° to 100°. In other words, the backrest portion 32 cannot be tilted forward or backward. In addition, covering members are removably attached to the seat portion 31 and the backrest portion 32, respectively. These covering members are made of soft fabric material, for example, cushioning material.

[0027] A waist belt 33 is provided between the seat portion 31 and the backrest portion 32 to restrain the waist of a child seated in the seat main body 3. A crotch belt 35 is provided on the seat portion 31 to restrain the crotch of a child seated in the seat main body 3. A shoulder belt 34 is provided on the backrest portion 32 to restrain the shoulders of a child seated in the seat main body 3. These belts 33, 34, 35 are connected near the child's abdomen by buckles 36 provided at the ends of these belts 33, 34, 35. These belts 33, 34, 35 are what is known as five-point belts. Furthermore, the waist belt 33 and the shoulder belts 34 do not have to be formed as separate belts, and may, for example, be provided as a single continuous belt.

[0028] When a child under one year old is to ride in the child car seat 1, as shown in Figure 1(A), the seat body 3 is turned backward relative to the base body 2, and the cushion structure 4 is attached to the corner formed by the seat portion 31 and the backrest portion 32. By attaching the cushion structure 4, the child car seat 1 is in a bed state. In the bed state, the child's back and buttocks are at an angle close to horizontal.

[0029] When placing a child between about 3 months and 24 months old in the child seat 1, the cushion structures 4 arranged at the corners are removed while the child is facing backwards, as shown in FIG. 1(B). By removing the cushion structures 4, the child seat 1 becomes a chair state. The chair state means that the child's back and buttocks are held at an angle. The bed state and chair state will be described later.

[0030] When a child between about 15 months and 4 years old is placed in the child seat 1, the cushion structure 4 is removed and the seat body 3 is positioned facing forward relative to the base body 2, as shown in Figure 1(C). The seat body 3 is tilted forward relative to the base body 2. This allows the child seat 1 to be in a chair state where the child's back and buttocks are kept at a greater angle than in Figure 1(B).

[0031] 1(A), the cushion structure 4 is used when a child under one year old is placed in the child seat 1. Next, the cushion structure 4 will be described.

[0032] (About the cushion structure) 2 to 5, cushion structure 4 is detachably attached to a corner formed by seat portion 31 and backrest portion 32. Cushion structure 4 includes shock absorbing cushion body 40 and housing 50 surrounding shock absorbing cushion body 40.

[0033] As shown in Figures 2, 3(B), and 3(C), the shock absorbing cushion body 40 has flexibility, resilience, cushioning properties, etc., and absorbs shock from a support surface 41 (described below). The shock absorbing cushion body 40 is, for example, in the shape of a substantially triangular prism, and is formed, for example, in a triangular shape in vertical cross section. The shock absorbing cushion body 40 is a synthetic resin foam having open cells, and is formed, for example, from urethane.

[0034] As shown in Fig. 3(B), the shock absorbing cushion 40 is arranged so that the long side 45, which is the longest side of a pair of substantially triangular side surfaces 42, faces upward, and the surface where the long side 45 forms part of the periphery (the surface with the largest area among the surfaces) becomes the support surface 41. The support surface 41 has a substantially rectangular shape in a plan view. The support surface 41 slopes downward toward the child's feet.

[0035] The pair of side surfaces 42 have a long side 45, a first short side 46, and a second short side 47, and the angle between the first short side 46 and the second short side 47 is, for example, 80° to 100°. The first short side 46 or the second short side 47 forms part of the periphery of the first bottom surface 43 and the second bottom surface 44, which are arranged to face the housing 50 side.

[0036] As shown in FIG. 1(A), when the child car seat 1 is facing backward and the cushion structure 4 is attached to a corner of the child car seat 1, the support surface 41 supports the back and buttocks of a child lying on their back from below at a nearly horizontal angle. In other words, the support surface 41 is the portion that supports the child's back and buttocks. In this case, the angle θ1 of the support surface 41 with respect to the horizontal plane is 20° or less, and preferably 15° or less. An angle of more than 20° creates too much of an angle on the child's back and buttocks, which is not suitable for children under one year old who cannot yet hold their head up. On the other hand, an angle of 15° or less allows the child's back and legs to be held with less of an angle. Thus, the bed state is a state in which the child's back and buttocks are supported at a nearly horizontal angle; specifically, the angle θ1 of the support surface 41 with respect to the horizontal plane is 20° or less.

[0037] As shown in FIG. 1(B), when the child car seat is turned rearward and the cushion structure 4 is removed from the corner of the child car seat 1, The covering members of the seat portion 31 and backrest portion 32 come into contact with the child's back and buttocks. In this case, the angle θ2 between the seat portion 31 and backrest portion 32 of the child car seat 1 is between 30° and 80° with respect to the horizontal plane. If it is less than 30°, it is too close to the bed state, and if it exceeds 80°, the child's back and buttocks are angled too much, which is not suitable for children around 3 months to 24 months old. Thus, the chair state is when the angle θ2 between the seat portion 31 and backrest portion 32 is between 30° and 80° with respect to the horizontal plane.

[0038] As shown in Figures 3(B) and 3(C), the shock absorbing cushion body 40 is formed by stacking a plurality of first cushion bodies 40A and a plurality of second cushion bodies 40B. The first cushion bodies 40A and the second cushion bodies 40B have different cushioning properties. The different cushioning properties mean that at least one of the hardness and the shape is different. In this embodiment, the first and second cushion bodies 40A and 40B have different hardnesses, with the hardness of the first cushion body 40A being set higher than the hardness of the second cushion body 40B.

[0039] As shown in Fig. 3(C), the first cushion body 40A and the second cushion body 40B have substantially the same shape, that is, a substantially triangular prism. The first and second cushion bodies 40A and 40B extend in a direction perpendicular to the support surface 41. Specifically, the first and second cushion bodies 40A and 40B extend linearly in the front-to-rear direction (the direction in which the child's body extends). In other words, the first cushion body 40A and the second cushion body 40B are stacked in the left-to-right direction.

[0040] The first and second cushion bodies 40A, 40B may be arranged alternately, or, for example, the first cushion body 40A with a low hardness may be located in the center in the left-right direction, and the second cushion body 40B with a high hardness may be located on either side of it. In this way, because the first and second cushion bodies 40A, 40B have the same shape and are layered in the left-right direction, the first and second cushion bodies 40A, 40B can be easily interchanged, allowing the shock absorbing cushion body 40 as a whole to have an optimal cushion hardness. Note that, from the perspective of hardness setting, it is preferable that the first and second cushion bodies 40A, 40B are not fixed with an adhesive or the like.

[0041] As shown in FIG. 3A, the housing 50 surrounds the shock-absorbing cushion 40 except for the support surface 41. The housing 50 abuts against the seat 31 and the backrest 32. The housing 50 is made of, for example, a synthetic resin, typically urethane. The housing 50 is set to have a higher hardness than the shock-absorbing cushion 40.

[0042] Housing 50 includes a top surface 51, a pair of side surfaces 52, and a bottom surface 53. As shown in Fig. 5, bottom surface 53 has a seat contact surface 54 that contacts seat portion 31, and a back contact surface 55 that contacts backrest portion 32. A recess 56 is formed in approximately the center of top surface 51. The thickness of seat contact surface 54 and back contact surface 55 is preferably 10 mm or more and 25 mm or less, and the thickness of the intersection where seat contact surface 54 and back contact surface 55 intersect is typically 25 mm.

[0043] As shown in FIG. 3A, the recess 56 includes a first bottom surface 56a, a second bottom surface 56b, and a pair of side surfaces 56c. The shock absorbing cushion 40 is disposed in the recess 56. Therefore, the first bottom surface 43 of the shock absorbing cushion 40 abuts against the first bottom surface 56a of the recess 56, the second bottom surface 44 of the shock absorbing cushion 40 abuts against the second bottom surface 56b, and the pair of side surfaces 42 abut against the pair of side surfaces 56c, respectively. In this manner, all four sides of the shock absorbing cushion 40, except for the support surface 41, are in close contact with the recess 56. The surfaces 56a, 56b, and 56c of the recess and the shock absorbing cushion 40 do not necessarily have to be fixed with an adhesive or the like.

[0044] Furthermore, the housing 50 has a pair of waist belt guide grooves 57 through which the waist belt 33 passes. and a crotch belt guide groove 58, through which the crotch belt passes, is formed on the front surface thereof. The waist belt guide groove 57 is formed by cutting out a pair of side surfaces 52 from the top surface 51 toward the bottom surface 53. The crotch belt guide groove 58 is formed by cutting out from the top surface 51 toward the seat contact surface 54.

[0045] The cushion structure 4 is in the first form (Figs. 4(A), 5(A)) during normal use, and can assume the second form (Figs. 4(B), 5(B)) when a load (impact load) that suddenly moves the child toward the backrest portion 32 is applied.

[0046] 4(A), when the cushion structure 4 is in the first form, the cushion structure 4 supports the back and buttocks of a child under one year old who is lying on his back from below at an angle close to horizontal. In other words, during normal use, the shock absorbing cushion body 40 and the housing 50 are hardly crushed, and maintain a bed state in which the angle θ1 of the support surface 41 is 20° or less with respect to the horizontal plane.

[0047] As shown in FIG. 5(A), the thickness T1 of the cushion structure 4 is, for example, 70 mm or more, preferably 90 mm or more. Here, the thickness T1 refers to the distance from the intersection A1, where the seat contact surface 54 and the backrest contact surface 55 intersect, to the intersection A2, where a line extending vertically from the intersection A1 intersects with the support surface 41. The same applies to the thickness T2 shown below. If the thickness T1 is 70 mm or more, corners can be filled and the child's back and buttocks can be supported at a nearly horizontal angle. Furthermore, if the thickness T1 is 90 mm or more, the child's back and buttocks can be supported at a nearly horizontal angle without feeling cramped even as the child grows. The thickness of the housing 50 connecting the intersections A1 and A2 is typically 25 mm.

[0048] As shown in FIGS. 4(B) and 5(B), when the cushion structure 4 is in the second configuration, it collapses to receive the load and deforms flat along the backrest 32. Specifically, when a load of 10 kg or more is applied, which moves the child suddenly toward the backrest 32, the cushion structure 4 assumes a chair state in which the angle θ3 of the support surface 41 is 35° to 45° with respect to the horizontal plane. In this way, the cushioning properties are set so that when a load of 10 kg or more is applied to the child, the cushion structure 4 changes from the bed state to the chair state. Note that the load that suddenly moves the child is, for example, a frontal impact such as a frontal collision or sudden braking of a vehicle. Furthermore, "flat" means that at least the backrest 32 has a vertically elongated shape along the backrest 32, and also includes the case where the portion along the seat 31 is elongated front to back.

[0049] When a load of 10 kg or more is applied, as shown in Figure 5(B), the thickness T2 from the intersection A1 where the seat contact surface 54 and the backrest contact surface 55 intersect to the intersection A2 of the support surface 41 is, for example, 45 mm or less, and preferably 20 mm or less. If it is 45 mm or 20 mm or less, the child's back and buttocks will be significantly recessed toward the backrest 32, allowing the child's back and buttocks to absorb the impact.

[0050] (About the operation of the cushion structure) 4 and 5, the operation of the cushion structure 4 when a child is placed in the child seat 1 will be described. Figures 4(A) and 5(A) show the state before the impact is received, and Figures 4(B) and 5(B) show the state after the impact is received.

[0051] When a child under one year old is placed in the child car seat 1, cushion structures 4 are attached to the corners of the child car seat 1 as shown in FIG. 4(A). By attaching the cushion structures 4, the child car seat 1 becomes a bed. Specifically, the corners of the support surfaces 41 The angle θ1 with respect to the horizontal plane is, for example, 15°. A child is placed on the support surface 41 of the cushion structure 4, and the waist belt 33, shoulder belt 34, and crotch belt 35 are connected with the buckle 36. This allows the child to lie face up on the support surface 41 of the child seat 1.

[0052] In this state, if a large impact is applied to the child in the child seat 1 from the front of the vehicle due to sudden braking or an accident, the cushion structure 4 collapses and becomes like a chair, as shown in FIG. 4(B). Specifically, when a load of 10 kg or more is applied to the child, the thickness T2 of the cushion structure 4 becomes, for example, 45 mm or less, and the angle θ3 of the support surface 41 becomes, for example, 35° to 45° with respect to the horizontal plane. Specifically, as shown in FIG. 5(B), a load of 10 g or more is first applied to the child's back and buttocks from the front, then the shock-absorbing cushion 40 collapses toward the backrest 32 and seat 54, and then the seat-contacting surface 54 and the backrest-contacting surface 55 of the housing 50 collapse toward the backrest 32 and seat 54. In this way, when a load is applied to the child, the cushion structure 4 collapses in stages, allowing the child's buttocks or back to absorb the impact.

[0053] Traditionally, when placing a child under one year old in a child car seat, the back of the car seat is tilted backward (the angle between the seat and back is increased) to create a bed-like position, and a shoulder belt is fastened to the child. In such child car seats, when the car is hit from the front by a vehicle accident or sudden braking, the child tends to move forward in reaction, and the shoulder belt is typically used to absorb the impact in an attempt to prevent this movement. In this case, if the shoulder belt is not securely fastened, the child may be thrown out upon impact, creating a safety issue. Even if the shoulder belt is securely fastened, the impact is concentrated on the child's shoulders, placing a great strain on the child.

[0054] In contrast, the child car seat 1 of this embodiment is in a bed state (Fig. 4(A)) when no impact is applied, and when an impact is applied, the cushion structure 4 is compressed and deformed, displacing it into a chair state (Fig. 4(B)). As a result, the impact on the child is received by the entire back, and the impact is distributed to the child's back and buttocks, thereby mitigating the impact and allowing the cushion structure 4 to absorb it.

[0055] Furthermore, because the cushion structure 4 can be detachably attached to the corners of the child seat 1, when a child under one year old is to ride in the child seat 1, the cushion structure 4 can be attached to the child seat 1 to turn it into a bed, and when a child between about three and 24 months old is to ride in the child seat 1, the cushion structure 4 can be removed from the child seat 1 to turn it into a chair. Therefore, even in a child seat in which the angle between the seat portion 31 and the backrest portion 32 is fixed, the shape and angle of the seat surface can be changed by whether or not the cushion structure 4 is attached, so that the simple structure can be adapted to the child's growth.

[0056] Furthermore, since the shock absorbing cushion body 40 uses multiple types of cushions, the first and second cushion bodies 40A and 40B, the desired hardness can be easily set by changing and combining the shapes or hardness of the cushions.

[0057] Although the cushion structure 4 of this embodiment includes the shock absorbing cushion body 40 and the housing 50, it is sufficient to include at least the shock absorbing cushion body 40. In this case, the shock absorbing cushion body 40 abuts against the seat portion 31 and the backrest portion 32, so the first bottom surface 43 serves as the backrest abutment surface, and the second bottom surface 44 serves as the seat abutment surface.

[0058] In this embodiment, the first and second cushion bodies 40A and 40B have the same shape. Although the hardnesses are different in the above example, the hardnesses may be the same but the shapes may be different. For example, the first and second cushion bodies 40A, 40B may have different thicknesses, or the bottom surfaces of the first and second cushion bodies 40A, 40B may have recesses or protrusions. Furthermore, the first and second cushion bodies 40A, 40B may have different shapes and hardnesses.

[0059] Furthermore, although the first and second cushion bodies 40A, 40B in this embodiment are provided linearly in the front-rear direction and stacked in the left-right direction, they may also be stacked, for example, in the up-down direction, diagonally, etc. Furthermore, the first and second cushion bodies 40A, 40B may be provided with dispersed through holes, for example, such that the first cushion body extends in a direction perpendicular to the support surface, and the second cushion body is inserted into the through holes.

[0060] Furthermore, in this embodiment, two types of cushions, the first and second cushion bodies 40A and 40B, are provided, but a plurality of cushions may also be provided.

[0061] Furthermore, in the above embodiment, the child car seat 1 including the cushion structure 4 has been described, but the cushion structure 4 may be provided alone. In this case, the cushion structure 4 of this embodiment can be attached to an existing child car seat afterwards. In this case, the cushion structure 4 may be detachably attached not only to a child car seat but also to childcare equipment such as a stroller, a baby rocker, or a childcare chair.

[0062] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0063] 1 child seat, 2 base body, 3 seat body, 4 cushion structure, 31 Seat portion, 32 backrest portion, 33 waist belt, 34 shoulder belt, 35 crotch belt, 40 shock absorbing cushion body, 40A first cushion body, 40B second cushion body, 41 support surface, 50 housing, 54 seat contact surface, 55 backrest contact surface, 57 waist belt guide groove, 58 crotch belt guide groove.

Claims

1. a seat body having a seat portion and a backrest portion; a cushion structure detachably attached to a corner portion formed by the seat portion and the backrest portion, The cushion structure is A support surface is provided that supports the back and buttocks of a child lying on their back from below with a flat surface, In normal use, the support surface holds the child's back and buttocks at a nearly horizontal angle in a first bed state; When a load is applied to move the child suddenly toward the backrest part, the child seat receives the load and deforms flat, thereby taking the second form in which the support surface is in a chair state with the child's back and buttocks at an angle.

2. 2. The child car seat according to claim 1, wherein in the first configuration, a thickness from the intersection of the backrest and the seat to the support surface is 70 mm or more.

3. The load is 10 kg or more, 3. The child car seat according to claim 2, wherein in the second configuration, a thickness from the intersection of the backrest and the seat to the support surface is 45 mm or less.

4. 4. The child car seat according to claim 1, wherein the angle of the support surface is 20 degrees or less with respect to the horizontal plane.

5. 5. The child car seat according to claim 1, wherein the cushion structure includes an impact absorbing cushion body having the support surface, and a housing surrounding the surfaces of the impact absorbing cushion body other than the support surface.

6. 6. The child car seat according to claim 5, wherein the housing has a hardness greater than that of the shock absorbing cushion body.

7. a waist belt for restraining the waist of a child seated in the seat body; The seat further includes a crotch belt for restraining the crotch of a child seated on the seat body, 7. The child car seat according to claim 5, wherein the housing has a pair of waist belt guide grooves on its side surfaces through which the waist belt passes, and a crotch belt guide groove on its front surface through which the crotch belt passes.

8. A cushion structure that is detachably attached to a corner portion formed by a seat portion and a backrest portion of a child car seat, the cushion structure includes a seat contact surface that contacts the seat, a backrest contact surface that contacts the backrest, and a support surface that supports the back and buttocks of a child lying on their back from below with a flat surface; The cushion structure is In normal use, the support surface holds the child's back and buttocks at a nearly horizontal angle in a first bed state; When a load is applied to move the child suddenly toward the backrest part, the cushion structure receives the load and deforms flat, thereby allowing the support surface to take a second form in which the child's back and buttocks are in a chair-like state with an angle.

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