WO2014104048A1

WO2014104048A1 - Hollow cushion

Info

Publication number: WO2014104048A1
Application number: PCT/JP2013/084556
Authority: WO
Inventors: 松下　剛
Original assignee: 株式会社Ｍｔｇ
Priority date: 2012-12-27
Filing date: 2013-12-25
Publication date: 2014-07-03
Also published as: TWI595851B; TW201433286A; JP2014124446A; CN103892616A; CN203735838U

Abstract

The present invention is a hollow cushion (1) which has a bottom surface wall portion (2), a seating surface wall portion (3), and an outer peripheral wall portion (4). The seating surface wall portion (3) is disposed in a state isolated facing the bottom surface wall portion (2), and has a seating surface (31) upon which a user is seated. The outer peripheral wall portion (4) connects the outer peripheral edge portion of the bottom surface wall portion (2) to the outer peripheral edge portion of the seating surface wall portion (3). The bottom surface wall portion (2), the seating surface wall portion (3), and the outer peripheral wall portion (4) are flexible, and an internal space circumscribed thereby is formed to be hollow. The outer peripheral edge portion of the seating surface wall portion (3) has, at least at mutually facing positions sandwiching a central portion (32) of the seating surface wall portion (3), a raised portion (5) which is raised above the outer peripheral wall portion (4) and the central portion (32) of the seating surface wall portion (3). The interior of the raised portion (5) is formed hollow in continuation to the interior space.

Description

Hollow cushion

The present invention relates to a hollow cushion used by injecting air into an internal space.

Since the shape of the outer surface of the hollow cushion easily deforms following the load, it is used, for example, as a cushion for sitting or as an exercise aid for promoting health.

For example, Patent Document 1 discloses an example of a hollow cushion in which an air shielding portion having a vent hole is provided in an internal space. The hollow cushion has an internal space divided into two hollow portions by an air shielding portion, and is configured such that air can flow between the hollow portions.

JP 2003-275065 A

However, in the hollow cushion described in Patent Document 1, when the user changes the posture, for example, when the user tilts the buttocks with respect to the hollow cushion, the seat surface of the hollow cushion is inclined. It deforms to encourage, and it tends to be in an unstable state that is difficult to recover. That is, the air in the hollow part moves from the part where the seat surface sinks due to the inclination of the collar part toward the opposite side, and the opposite side of the seat part sinks, while the sinking part remains submerged. Cheap. As a result, the posture of the seated user is difficult to stabilize.

In addition, since the hollow cushion has the above-described characteristics, it is difficult to repeat this smoothly, for example, when a seated user performs an operation of alternately tilting the seating surface left and right. For this reason, the hollow cushion cannot always be effectively used as an exercise aid.

The present invention has been made in view of such a background, and an object of the present invention is to provide a hollow cushion that is easy to stabilize the posture of the user and can be used as an exercise aid.

One aspect of the present invention is a bottom wall,
A seating surface wall having a seating surface on which a user is seated, arranged in a state of being opposed to the bottom wall,
An outer peripheral wall connecting the outer peripheral edge of the bottom wall and the outer peripheral edge of the seat wall;
The bottom wall portion, the seat wall portion, and the outer peripheral wall portion are flexible, and the inner space surrounded by them is formed hollow,
The outer peripheral edge portion of the seat surface wall portion has a raised portion that protrudes above the center portion of the seat surface wall portion together with the outer peripheral wall portion at a position facing each other across at least the center portion of the seat surface wall portion. And
The inside of the raised portion is a hollow cushion characterized in that it is formed in a hollow continuous with the internal space.

The hollow cushion is located above at least two positions facing each other across the central portion of the seating surface wall portion on the outer peripheral edge of the seating surface wall portion, together with the outer peripheral wall portion and above the central portion of the seating surface wall portion. Has a raised ridge. Moreover, the inside of this protruding part is formed in a hollow continuously to the internal space. Therefore, when the user is seated, the hollow cushion can suppress the seat surface from being inclined in one direction and becoming unstable.

That is, when the seating surface is intended to be tilted to one side, at least in the direction in which the bulging portions face each other, the bulging portion on the side inclined to a low side causes the thickness of the outer peripheral edge of the hollow cushion to be excessive. Thinning can be suppressed. Therefore, the hollow cushion can restrict the seat surface from being excessively inclined in one direction when the user is seated. As a result, the hollow cushion is relatively easy to stabilize the user's posture.

Further, as described above, the hollow cushion can suppress the thickness at the outer peripheral edge portion from becoming excessively thin. Therefore, the hollow cushion can appropriately perform the tilting operation of the seating surface in a state where the user is seated. For example, when performing a swinging motion or a twisting motion of the waist, the exercise effect can be improved. .

Further, the hollow cushion has a structure in which air in the internal space is likely to gather inside the raised portion when a user is seated on the seating surface. Therefore, the said seat surface wall part side of the said protruding part expands / contracts, and it is easy to follow the shape of a user's buttocks. As a result, the hollow cushion can improve the fit of the seat surface, and can easily obtain a high sense of stability when the seat surface is tilted. As described above, the hollow cushion can perform the tilting operation of the seat surface with a sense of stability, and can easily obtain a sense of stability both during the simple sitting and during the tilting operation of the seat surface. As a result, the hollow cushion can be suitably used as an exercise aid.

As described above, the hollow cushion is easy to stabilize the posture of the user and can be used as an exercise aid.

The perspective view of the hollow cushion in an Example. The top view of the hollow cushion in an Example. The front view of the hollow cushion in an Example. The side view of the hollow cushion in an Example. FIG. 5 is a cross-sectional view taken along line VV in FIG. 2. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. Explanatory drawing which shows the calculation method of the angle which the curvature radius of a top part and the outer peripheral wall part and a seat surface wall part make in an Example.

In the hollow cushion, as a material constituting the bottom wall portion, the seat wall portion, and the outer peripheral wall portion, a flexible material can be adopted. Specifically, soft plastics such as soft polyvinyl chloride resin and elastic materials such as natural rubber, synthetic rubber and silicone elastomer can be employed, and these may be used in combination.

Moreover, it is preferable that the raised portion has a top portion having a substantially circular arc shape in which the shape in the longitudinal section is convex upward. In this case, since the strength of the top portion is structurally high, the top portion is less likely to be deformed when the user is seated. Therefore, when the user is seated on the seat wall portion, the shape of the raised portion is not easily deformed, and more air is easily collected from the internal space to the raised portion. As a result, the hollow cushion easily obtains a higher sense of stability both when it is simply seated and when it is tilted.

Here, the substantially arc shape indicating the shape of the top portion is not limited to a geometrically defined arc, but is a concept including a shape recognized as an arc as a general sense. That is, the shape indicated by the “substantially arc shape” includes, for example, shapes such as a parabola, a hyperbola, or a part of an ellipse, and these are deformed shapes that can be recognized as arcs as a general sense. May be. The vertical cross section of the raised portion is a cross section that connects the both sides of the outer peripheral wall portion side and the seat surface wall portion side with the top portion interposed therebetween.

The top portion has a substantially arc shape with a curvature radius of 5 to 30 mm in the longitudinal cross section, and an angle formed between the outer peripheral wall portion and the seat wall portion that are continuous across the top portion is greater than 0 ° and 80 °. It is preferable that it is less than. In this case, since the strength of the top portion is structurally higher, the top portion is less likely to be deformed when the user is seated. Therefore, as described above, when the user is seated on the seating surface wall portion, more air is easily collected from the internal space to the raised portion. As a result, the hollow cushion easily obtains a higher sense of stability both when it is simply seated and when it is tilted. Further, the radius of curvature described above is preferably 7 to 25 mm, more preferably 10 to 20 mm, from the viewpoint of further improving the strength of the top.

Here, the radius of curvature of the top can be determined by the following method, for example. First, in the longitudinal section, a virtual approximate circle passing through the apex is set so as to approximate a substantially arc-shaped portion in the outline of the top. The radius of the virtual circle thus obtained can be set as the radius of curvature of the top.

Further, the angle formed by the outer peripheral wall portion and the seat wall portion can be determined by the following method, for example. That is, after obtaining the curvature radius of the top, a virtual approximate circle having the radius of curvature as the radius is drawn so as to overlap with the outline of the top. Next, at the both ends of the top, two points at which the outline of the top starts to separate from the approximate circle are set. Then, a tangent line is drawn for each of the two points, and an angle formed by the two tangent lines can be set as an angle formed by the outer peripheral wall portion and the seat surface wall portion.

Moreover, the said seat surface wall part may have a pair of side protruding part distribute | arranged to the both-sides edge part as said protruding part. In this case, the pair of side ridges are arranged on the sides of the seated user. Thereby, the said hollow cushion becomes a thing with higher stability with respect to the tilting action to the side of the said seat surface. As a result, the hollow cushion can be more suitably used as an exercise aid.

Further, the pair of lateral bulges may have a curved shape with an outwardly convex outline when the lateral bulges are viewed from the outside. That is, the shape of the outline when the side bulging portion is viewed from the outside may be any shape that gently descends from the apex toward both ends. In this case, since the strength of the pair of side raised portions is structurally high, the pair of side raised portions are less likely to be deformed when the user is seated. Therefore, as described above, when the user is seated on the seat wall portion, more air is easily collected from the internal space to the pair of side raised portions, and the hollow cushion is used only when sitting or It becomes easy to obtain a higher sense of stability in both tilting operations.

Moreover, the said seat surface wall part may have the back protruding part distribute | arranged to the back edge part as the said protruding part. In this case, when the user is seated, the air that moves from the internal space is likely to gather in the rear ridge. As a result, the hollow cushion easily obtains a higher sense of stability both when it is simply seated and when it is tilted.

Further, the rear raised portion may be arranged to connect between the pair of side raised portions. In this case, since the rear edge of each of the pair of side raised portions is connected to each other by the rear raised portion, the outward deformation of the pair of side raised portions is easily restricted. . As a result, the hollow cushion can further improve the fit of the seating surface, and the hollow cushion can easily obtain a higher sense of stability both during sitting and tilting.

Moreover, the said seat surface wall part may have the front protruding part distribute | arranged to the front center part as said protruding part. In this case, when the user is seated, the air moving from the internal space is likely to gather at the front raised portion. As a result, the hollow cushion easily obtains a higher sense of stability both when it is simply seated and when it is tilted.

Further, on both sides of the front raised portion on the front side of the seat surface wall portion, there may be a non-lifted portion continuous with the outer peripheral wall portion below the top portion of the front raised portion. In this case, the user can sit on the seating surface while placing the leg portion on the non-raised portion. Further, in this case, the forward raised portion is likely to follow the shape of the user's crotch, and the shape can suppress the displacement between the seat surface and the user's buttocks. As a result, the hollow cushion can further improve the fit of the seating surface, and the user can easily obtain a higher sense of stability.

Further, flocking coating may be applied to at least the outer surfaces of the seat wall portion and the outer peripheral wall portion. In this case, when the user performs the tilting operation of the seating surface, the frictional force between the user's buttocks and the seating surface can be further increased. Therefore, the user's buttocks are not easily displaced from the seat surface, and the tilting operation of the seat surface can be performed more easily. As a result, the hollow cushion is easy to obtain a high sense of stability and can be more suitably used as an exercise aid.

In this case, since a layer made of short fibers is formed on the outer surface of the hollow cushion, the wall portion to which the flocking coating is applied has a heat insulating property. For this reason, when the user is seated, the heat of the body surface is hardly transmitted to the seat wall portion or the like. As a result, the hollow cushion is less likely to feel cold when the user is seated, and is more preferable for the user.

Examples of the hollow cushion will be described with reference to FIGS. As shown in FIG. 1, the hollow cushion 1 has a bottom wall portion 2, a seating surface wall portion 3, and an outer peripheral wall portion 4. As shown in FIGS. 5 and 6, the seat surface wall portion 3 is arranged in a state of being separated from the bottom wall portion 2, and has a seat surface 31 on which a user is seated as shown in FIG. 1. Yes. As shown in FIG. 1, the outer peripheral wall 4 connects the outer peripheral edge of the bottom wall 2 and the outer peripheral edge of the seat wall 3. The bottom wall 2, the seat wall 3, and the outer peripheral wall 4 have flexibility, and as shown in FIGS. 5 and 6, the internal space 11 surrounded by them is formed hollow. . Further, as shown in FIGS. 1 to 3, the outer peripheral edge of the seat wall 3 is at least the center of the seat wall 3 together with the outer peripheral wall 4 at a position facing each other across the center 32 of the seat wall 3. The raised portion 5 is raised above the portion 32. As shown in FIGS. 5 and 6, the interior 50 of the raised portion 5 is formed to be hollow continuously to the internal space 11.

As shown in FIG. 2, the hollow cushion 1 has a substantially circular shape when viewed from above, and a central portion thereof functions as a seating surface 31. Further, the hollow cushion 1 has a pair of side raised portions 51, a rear raised portion 52, and a forward raised portion 53, which are arranged so as to surround the seat surface 31 as the raised portions 5.

The seat wall portion 3, the bottom wall portion 2 and the outer peripheral wall portion 4 of the hollow cushion 1 are made of flexible soft polyvinyl chloride resin, and each has a thickness of 5.5 mm. The outer surface of the hollow cushion 1, that is, the outer surfaces of the seat wall portion 3, the bottom wall portion 2, and the outer peripheral wall portion 4 is subjected to flocking coating. Flocking coating is performed by bonding nylon short fibers to the outer surface of the hollow cushion 1 using an adhesive.

Although not shown in the drawing, the bottom wall portion 2 is formed in a disc shape having substantially the same shape as the top view of the hollow cushion 1. Further, as shown in FIGS. 5 and 6, the bottom wall 2 is provided with a check valve 21 for injecting or discharging air into the internal space 11.

As shown in FIG. 2, the seat surface wall portion 3 has a substantially circular shape when viewed from above, and has a seat surface 31 formed flat at the center thereof. In this example, the seat surface wall portion 3 is arranged so that the bottom wall portion 2 and the seat surface 31 are substantially parallel, and the height H (see FIG. 6) of the seat surface 31 is 70.2 mm. As shown in FIGS. 5 and 6, the region constituting each of the pair of side raised portions 51, the rear raised portions 52, and the front raised portions 53 in the outer peripheral edge portion of the seat surface wall portion 3 is a seat surface 31. It has a curved surface shape that curves upward as it goes outward from the outer peripheral edge.

As shown in FIGS. 3 and 4, the outer peripheral wall portion 4 is curved so that the central portion 41 in the vertical direction slightly bulges outward, and between the bottom wall portion 2 and the seat surface wall portion 3. Connected.

As shown in FIGS. 2 and 3, the seat surface wall portion 3 has a pair of side raised portions 51 on both side edges as raised portions 5. As shown in FIGS. 2 and 3, the pair of side raised portions 51 are erected on both sides of the central portion 32 of the seating surface wall portion 3. Further, as shown in FIG. 4, the outer shape line 510 when the lateral ridge 51 is viewed from the outside has an upwardly convex curved shape. In this example, the height I (see FIG. 4) of the side ridge 51 is 142 mm.

Moreover, as shown in FIG. 6, the top part 511 where the outer peripheral wall part 4 and the seat surface wall part 3 in the pair of side ridges 51 are connected has an upwardly convex shape in the longitudinal section of the side ridge part 51. It has a substantially arc shape. And the top part 511 of the side bulging part 51 has a substantially arc shape with a curvature radius of 14 mm in the longitudinal cross section, and the angle formed between the outer peripheral wall part 4 and the seating surface wall part 3 that are continuous across the top part 511 is 40. °.

In addition, the curvature radius of the top part 511 mentioned above and the angle made by the outer peripheral wall part 4 and the seat surface wall part 3 were calculated by the method using the above-mentioned approximate circle. That is, as shown in FIG. 7, a virtual approximate circle 513 passing through the apex 512 is set so as to approximate a substantially arc-shaped portion in the outline 510 of the top 511 in the longitudinal cross section of the side raised portion 51. The radius R of the approximate circle 513 obtained as a result was taken as the radius of curvature of the top 511. Next, as shown in FIG. 7, a virtual approximate circle 513 having the radius of curvature as the radius is drawn so as to overlap with the outline 510 of the top portion 511, and both sides sandwiching the apex 512, that is, the seat wall portion 3 side and the outer peripheral wall portion. On each of the four sides, a point 514 (see FIG. 7) where the outline 510 of the top 511 starts to move away from the approximate circle 513 was set. Then, as shown in FIG. 7, a tangent line 515 is drawn for each of the two points 514, and an angle θ formed by the two tangent lines 515 is defined as an angle formed by the outer peripheral wall portion 4 and the seating surface wall portion 3.

As shown in FIGS. 1 to 3, the seat wall portion 3 has a rear raised portion 52 at the rear edge as the raised portion 5. As shown in FIGS. 1 to 3, the rear raised portion 52 is erected on the rear edge of the seating surface wall portion 3 and is arranged so as to connect between the pair of side raised portions 51. In this example, the height J (see FIG. 5) of the central portion of the rear raised portion 52 is 93 mm. Further, as shown in FIG. 3, the rear raised portion 52 is formed so as to gradually increase toward the side with the central portion as the lowest point.

Moreover, as shown in FIG. 5, the top part 521 where the outer peripheral wall part 4 and the seat surface wall part 3 in the rear bulge part 52 are connected has a substantially arc shape in which the shape in the longitudinal section of the rear bulge part 52 is convex upward. Presents. The top portion 521 of the rear raised portion 52 has a substantially arc shape with a radius of curvature of 14 mm in the longitudinal section, and an angle formed between the outer peripheral wall portion 4 and the seating surface wall portion 3 that are continuous across the top portion 521 is 40 °. It is. Although not shown in the drawing, the radius of curvature at the top 521 of the rear raised portion 52 and the angle formed between the outer peripheral wall portion 4 and the seat surface wall portion 3 are approximate circles as in the case of the side raised portion 51. It was calculated by the method.

Further, as shown in FIGS. 1 to 3, the seat surface wall portion 3 has a front raised portion 53 as a raised portion 5 at the front center portion. The front raised portion 53 is disposed on the center line 12 (see FIG. 2) in the lateral direction of the hollow cushion 1, and as shown in FIG. .

As shown in FIGS. 1 and 3, on both sides of the front raised portion 53 on the front side of the seat surface wall portion 3, a non-lifted portion 532 connected to the outer peripheral wall portion 4 below the top portion 531 of the front raised portion 53. have. That is, the non-raised portion 532 is disposed between the front raised portion 53 and each lateral raised portion 51 at the outer peripheral edge of the seat surface wall portion 3.

Next, the function and effect of the hollow cushion 1 will be described. As shown in FIG. 2, the hollow cushion 1 has a seat surface wall portion together with the outer peripheral wall portion 4 at at least two positions facing each other across the central portion 32 of the seat surface wall portion 3 on the outer peripheral edge portion of the seat surface wall portion 3. 3 has a raised portion 5 that is raised above the central portion 32. Further, as shown in FIGS. 5 and 6, the interior 50 of the raised portion 5 is formed to be hollow continuously to the internal space 11. Therefore, the hollow cushion 1 can suppress the seat surface 31 from being inclined too much in one direction and becoming unstable when the user is seated.

Moreover, the hollow cushion 1 can suppress that the thickness in the outer periphery part becomes thin too much as mentioned above. Therefore, the hollow cushion 1 can appropriately perform the tilting operation of the seat surface 31 in a state where the user is seated, and can improve the exercise effect when performing, for example, a swinging motion or a twisting motion of the waist. .

Further, the hollow cushion 1 has a structure in which air in the internal space 11 easily collects in the interior 50 of the raised portion 5 when the user is seated on the seating surface 31. Therefore, the seat surface wall 3 side of the raised portion 5 expands and contracts, and easily follows the shape of the user's buttocks. As a result, the hollow cushion 1 can improve the fit of the seat surface 31 and easily obtain a high sense of stability when the seat surface 31 is tilted. As described above, the hollow cushion 1 can perform the tilting operation of the seat surface 31 with a sense of stability, and can easily obtain a sense of stability both during the simple sitting and during the tilting operation of the seat surface 31. As a result, the hollow cushion 1 can be suitably used as an exercise aid.

Further, as shown in FIGS. 1 to 3, the seat surface wall portion 3 has a pair of side raised portions 51 disposed on both side edges as raised portions 5. For this reason, the pair of side raised portions 51 are arranged on the sides of the seated user. Thereby, the hollow cushion 1 becomes more stable with respect to the tilting operation to the side of the seat surface 31. As a result, the hollow cushion 1 can be more suitably used as an exercise aid.

Further, as shown in FIGS. 6 and 7, the top portion 511 of the pair of side raised portions 51 where the outer peripheral wall portion 4 and the seat surface wall portion 3 are connected has an upwardly convex shape in the longitudinal section of the raised portion 5. It has a substantially arc shape. The radius of curvature in the longitudinal section of the top portion 511 is 5 to 30 mm, and the angle formed between the outer peripheral wall portion 4 and the seating surface wall portion 3 that are continuous across the top portion 511 is more than 0 ° and less than 80 °. As a result, the strength of the top portion 511 is structurally increased, and the top portion 511 is less likely to be deformed when the user is seated. Therefore, when the user is seated on the seating surface wall portion 3, the shape of the side raised portion 51 is not easily deformed.

Further, as shown in FIG. 4, the pair of side raised portions 51 has a curved shape in which an outline 510 when the side raised portions 51 are viewed from the outside is convex upward. Therefore, the strength of the pair of side raised portions 51 is structurally increased, and the pair of side raised portions 51 are less likely to be deformed when the user is seated.

Thus, the pair of side raised portions 51 are less likely to be deformed when the user is seated by making both the shape of the longitudinal section and the shape when viewed from the outside as described above. As a result, when the user is seated on the seating surface wall portion 3, more air is easily collected from the internal space 11 to the pair of side raised portions 51. Therefore, the hollow cushion 1 is simply seated or tilted. In both cases, it becomes easier to obtain a higher sense of stability.

Moreover, as shown in FIG.1 and FIG.2, the seat surface wall part 3 has the back protrusion part 52 distribute | arranged to the back edge as the protrusion part 5. As shown in FIG. Therefore, the air that moves from the internal space 11 when the user is seated easily collects in the rear raised portion 52. As a result, the hollow cushion 1 is easy to obtain a higher sense of stability both during simple sitting and during tilting.

Also, as shown in FIGS. 1 to 3, in the present example, the rear raised portion 52 is disposed so as to connect between the pair of side raised portions 51. Therefore, the pair of side ridges 51 are easily restricted from being deformed outwardly by the pair of side ridges 51 being connected to each other by the rear ridges 52. As a result, the hollow cushion 1 can further improve the fitting feeling of the seating surface 31, and the hollow cushion 1 can easily obtain a higher sense of stability both during sitting and tilting.

Moreover, as shown in FIG. 5, the top part 521 where the outer peripheral wall part 4 and the seat surface wall part 3 in the rear bulge part 52 are connected has a substantially circular arc shape in which the shape in the longitudinal section of the rear bulge part 52 is upward. Presents. The curvature radius in the longitudinal section of the top portion 521 is 5 to 30 mm, and the angle formed between the outer peripheral wall portion 4 and the seating surface wall portion 3 that are continuous across the top portion 521 is more than 0 ° and less than 80 °. As a result, the rear raised portion 52, like the side raised portion 51, has a structurally high strength of the top portion 521, and the top portion 521 is less likely to be deformed when the user is seated. Therefore, when the user is seated on the seating surface wall portion 3, the shape of the rear raised portion 52 is not easily deformed.

Further, as shown in FIGS. 1 to 5, the seat surface wall portion 3 has, as the raised portion 5, a forward raised portion 53 disposed in the front center portion. Therefore, when the user is seated, the air moving from the internal space 11 is likely to gather at the front raised portion 53. As a result, the hollow cushion 1 is easy to obtain a higher sense of stability both during simple sitting and during tilting.

Further, as shown in FIGS. 1 to 3, on both sides of the front raised portion 53 on the front side of the seat wall portion 3, a non-lifted portion 532 that is continuous with the outer peripheral wall portion 4 below the top portion 531 of the front raised portion 53. have. Therefore, the user can sit on the seat surface 31 while placing the leg portion on the non-raised portion 532. Further, the front raised portion 53 tends to follow the shape of the user's crotch, and the shape can suppress the displacement between the seat surface 31 and the user's buttocks. As a result, the hollow cushion 1 can further improve the fit of the seating surface 31, and can easily obtain a higher sense of stability for the user.

Further, flocking coating is applied to the outer surfaces of the seat surface wall portion 3, the outer peripheral wall portion 4, and the bottom wall portion 2. Thereby, when a user performs tilting operation of the seat surface 31, the frictional force of a user's buttocks and the seat surface 31 can be enlarged more. Therefore, the user's buttocks are less likely to be displaced from the seating surface 31, and the tilting operation of the seating surface 31 can be performed more easily. As a result, the hollow cushion 1 is easy to obtain a high sense of stability and can be used more suitably as an exercise aid.

Further, since a layer made of short fibers is formed on the outer surface of the hollow cushion 1, the wall portion to which the flocking coating is applied has a heat insulating property. Therefore, when the user is seated, the heat of the body surface is not easily transmitted to the seating surface wall 3 or the like. As a result, the hollow cushion 1 is less likely to feel cold when the user is seated, and is more preferable for the user.

In this example, as a material for the bottom wall 2, the seat wall 3, and the outer peripheral wall 4, flexible soft polyvinyl chloride resin is used. The soft polyvinyl chloride resin has flexibility and has a property of easily increasing the restoring force to restore the original shape after being deformed by an external force. Therefore, the hollow cushion 1 using the soft polyvinyl chloride resin can further improve the fit of the seating surface 31, and can easily obtain a higher sense of stability both when sitting and tilting.

As described above, the hollow cushion 1 is easy to stabilize the posture of the user and can be used as an exercise aid.

In addition, in the said Example, although the example of the hollow cushion 1 provided with a pair of side protruding part 51, the back protruding part 52, and the front protruding part 53 was shown as the protruding part 5, the protruding part 5 is It is sufficient that they are arranged at positions facing each other across at least the central portion 32 of the seating surface wall portion 3. That is, for example, only the pair of side ridges 51 is provided, and the rear ridge 52 and the front ridge 53 are not provided, or the pair of side ridges 51 are not provided, and the rear ridge 52 and the front ridge 53 are not provided. It can also take the structure which has.

Further, the shapes of the pair of side raised portions 51, the rear raised portion 52, and the forward raised portion 53 are not limited to the shapes of the above-described embodiments. For example, a configuration is conceivable in which the contour line 510 viewed from the outside of the pair of side ridges 51 is not curved, and is erected so that the upper end thereof is parallel to the bottom wall 2. Further, regarding the shape in the vertical cross section of the top portion of each raised portion 5, a configuration in which the shape is a rectangular shape instead of a substantially arc shape is conceivable.

Further, the material of the hollow cushion 1 is not limited to the soft polyvinyl chloride resin, and any known material can be adopted as long as it is flexible. Of these, by adopting a material that has flexibility and has a property of easily increasing the restoring force to restore the original shape after being deformed by an external force, as described above, It is possible to obtain the hollow cushion 1 that can easily obtain a higher sense of stability both when sitting and when tilting.

Claims

A bottom wall,
A seating surface wall having a seating surface on which a user is seated, arranged in a state of being opposed to the bottom wall,
An outer peripheral wall connecting the outer peripheral edge of the bottom wall and the outer peripheral edge of the seat wall;
The bottom wall portion, the seat wall portion, and the outer peripheral wall portion are flexible, and the inner space surrounded by them is formed hollow,
The outer peripheral edge portion of the seat surface wall portion has a raised portion that protrudes above the center portion of the seat surface wall portion together with the outer peripheral wall portion at a position facing each other across at least the center portion of the seat surface wall portion. And
The hollow cushion characterized in that the inside of the raised portion is formed hollow continuously to the internal space.
2. The hollow cushion according to claim 1, wherein the raised portion has a top portion having a substantially arc shape in which a shape in a longitudinal section is convex upward.
The hollow cushion according to claim 2, wherein the top portion has a substantially arc shape with a curvature radius of 5 to 30 mm in a longitudinal section, and the outer peripheral wall portion and the seat surface wall portion that are continuous with the top portion interposed therebetween. A hollow cushion characterized in that the angle formed is greater than 0 ° and less than 80 °.
The hollow cushion according to any one of claims 1 to 3, wherein the seat surface wall portion includes a pair of side raised portions disposed on both side edges as the raised portions. Hollow cushion to be.
5. The hollow cushion according to claim 4, wherein the pair of side ridges have a curved shape in which an outline when the side ridges are viewed from the outside is convex upward. Hollow cushion.
The hollow cushion according to any one of claims 1 to 5, wherein the seat surface wall portion has, as the raised portion, a rear raised portion disposed at a rear edge portion. .
The hollow cushion according to any one of claims 1 to 6, wherein the seat surface wall portion has a front raised portion disposed at a front center portion as the raised portion. .
The hollow cushion according to claim 7, wherein both sides of the front raised portion on the front side of the seat wall portion have a non-lifted portion continuous with the outer peripheral wall portion below the top portion of the front raised portion. A hollow cushion characterized by having
The hollow cushion according to any one of claims 1 to 8, wherein a flocking coating is applied to at least outer surfaces of the seat wall portion and the outer peripheral wall portion.