JP2024083876A - Lumbar support and cushion - Google Patents

Abstract

To provide a lumbar support and a cushion which firmly support the back and the waist of a user and make a posture of the user good.SOLUTION: A lumbar support 20 according to one embodiment is composed of a flexibility material. The lumbar support 20 includes: a lumbar spine support part 21 supporting a user's lumbar spine from the back; a pair of side parts 23 positioned on left and right both sides of a user when seen from the user whose lumbar spine is supported by the lumbar spine support part 21; and a pair of connection parts 22 which extends from the lumbar spine support part 21 to the pair of side parts 23 respectively. Each of the pair of connection parts 22 extends obliquely backward from the lumbar spine support part 21 when seen from the user whose lumbar spine is supported by the lumbar spine support part 21 and presents a plate shape in a plan view.SELECTED DRAWING: Figure 2

Description

This disclosure relates to a lumbar support and cushion against which the user's body rests.

Patent Document 1 describes a lumbar cushion. The lumbar cushion is placed between the backrest and seat of a hairdressing chair. The lumbar cushion has a backside shape that can move along the backrest in the height direction of the seated person. The lumbar cushion is curved so as to abut and support the sides of the seated person's lower back when the seated person's back abuts against the backrest. In other words, the lumbar cushion has an abutment portion against which the seated person's back abuts, and a pair of lower back support portions that are bent left and right and diagonally forward from the abutment portion. The abutment portion and the pair of lower back support portions are each flat.

JP 2020-103694 A

When sitting on a chair or the like, it is required to maintain the correct posture when sitting. However, in the above-mentioned lumbar cushion, the contact portion and the pair of lumbar support portions are each flat, so there is a concern that the back and waist of the user of the lumbar cushion may not be supported properly. Therefore, it is required to support the back and waist of the user properly and maintain good posture.

The purpose of this disclosure is to provide a lumbar support and cushion that can firmly support the user's back and hips and improve the user's posture.

A lumbar support according to one aspect of the present disclosure is (1) a lumbar support made of a flexible material. The lumbar support includes a lumbar support section that supports the lumbar vertebrae of a user from behind, a pair of side sections located on both the left and right sides of the user as viewed from the user whose lumbar vertebrae are supported by the lumbar support section, and a pair of connecting sections that extend from the lumbar support section to each of the pair of side sections. Each of the pair of connecting sections extends diagonally backward from the lumbar support section as viewed from the user whose lumbar vertebrae are supported by the lumbar support section, and has a plate-like shape in a plan view.

This lumbar support has a lumbar support section that supports the user's lumbar vertebrae from behind, and a pair of side sections located on the left and right sides of the user, and each side section and the lumbar support section are connected to each other via a connection section. This lumbar support is made of a flexible material, and each of the pair of connection sections extends diagonally backward from the lumbar support section and is plate-shaped in a plan view. Therefore, when the user's lumbar vertebrae abut against the lumbar support section, the pair of connection sections bend backward, and the pair of side sections move in a direction approaching each other and approaching both sides of the user's waist. Thus, while the lumbar support section supports the user's back, the pair of side sections can support the left and right sides of the user's waist. As a result, the user's back and the left and right sides of the waist are firmly supported, improving the user's posture.

(2) In the above (1), each of the pair of side parts may have an inner surface facing the user and an iliac support part protruding from the inner surface and supporting the user's ilium. In this case, the user's ilium comes into contact with each of the pair of iliac support parts, and each of the user's left and right iliac bones is supported by each of the iliac support parts. By supporting each of the user's iliac bones, the user's lower back can be more firmly supported.

(3) In the above (1) or (2), the lumbar support part may have a protruding part that protrudes toward the back of the user, and a first recess that is recessed from the protruding part and extends along the height direction of the user's body. In this case, the user's lumbar vertebrae can be gently supported by fitting into the first recess. Furthermore, by visually checking the first recess of the lumbar support part, the user can understand that the lumbar vertebrae should be supported by the lumbar support part. In other words, the first recess can be used as a marker for the lumbar support part.

(4) In the above (2), each of the pair of side parts may have a rib support part that protrudes from the inner surface at a position between the lumbar support part and each of the pair of iliac support parts and supports the lower part of the user's ribs. In this case, the lower part of the user's ribs can be supported by the pair of rib support parts located between the lumbar support part and each of the pair of iliac support parts.

A lumbar support according to another aspect of the present disclosure is (5) a lumbar support made of a flexible material. The lumbar support includes a lumbar support section that supports the lumbar vertebrae of a user from behind, a pair of side sections located on both the left and right sides of the user when viewed from the user whose lumbar vertebrae are supported by the lumbar support section, and a pair of connecting sections that extend from the lumbar support section to each of the pair of side sections. Each of the pair of side sections has an inner surface facing the user, an iliac support section that protrudes from the inner surface and supports the user's ilium, and a second recess recessed from the iliac support section.

This lumbar support has a lumbar support section that supports the user's lumbar vertebrae from behind, and a pair of side sections located on the left and right sides of the user, and each side section and the lumbar support section are connected to each other via a connecting section. Thus, like the lumbar support described above, the support can firmly support the user's back and waist, improving the user's posture. Each of the pair of side sections has an inner surface facing the user, an iliac support section that protrudes from the inner surface and supports the user's iliac bone, and a second recess recessed from the iliac support section. Thus, the user's iliac bone comes into contact with each of the pair of iliac support sections, and the left and right iliac bones of the user are supported by each of the iliac support sections. The user's iliac bone fits into the second recess, so that the user's iliac bone can be gently supported. Furthermore, the user can visually recognize the second recess of the iliac support section, and can understand that the iliac support section should support the iliac bone. In other words, the second recess can be used as a marker for the iliac support section.

The cushion according to the present disclosure comprises a lumbar support as described in any one of (1) to (5) above, and a cushion part located below the lumbar support and having a seating part on which a user sits. This cushion comprises the above-mentioned lumbar support. Therefore, the same effect as the above-mentioned lumbar support can be obtained. Furthermore, this cushion comprises a cushion part located below the lumbar support and having a seating part. Therefore, the back and waist of a user seated on the seating part can be firmly supported, and the user's posture can be more reliably maintained in a good state.

This disclosure provides firm support for the user's back and hips, improving the user's posture.

FIG. 2 is a perspective view showing a lumbar support and a cushion according to the embodiment. FIG. 2 is a plan view showing the lumbar support and cushion of FIG. 1. FIG. 2 is a rear perspective view of the lumbar support and cushion of FIG. 1. FIG. 2 is a perspective view showing the lumbar support of FIG. 1 . FIG. 5 is a plan view for explaining the operation of the lumbar support of FIG. 4 .

Below, an embodiment of a lumbar support and a cushion according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are given the same reference numerals, and duplicated descriptions will be omitted as appropriate. The drawings may be partially simplified or exaggerated to facilitate understanding, and the dimensional ratios and the like are not limited to those shown in the drawings.

In the embodiment, the lumbar support and cushion are made of a flexible material. "Flexible material" refers to a cushioning material that deforms when the body is placed on it and a load is applied. As an example, the lumbar support and cushion are placed on a chair. The "chair" is something that a user of the lumbar support and cushion can sit on.

A "lumbar support" is used to support the user's lower back (lumbar vertebrae). For example, the lumbar support fits between the back of a chair and the user's lower back, so that the lower back of the user seated in the chair is supported by the lumbar support. "User" refers to the person using the lumbar support or cushion, for example, a person who attaches the lumbar support behind their lower back, or a person who sits on the cushion.

Figure 1 is a front view showing a lumbar support 20 and a cushion 1 according to this embodiment. The cushion 1 according to this embodiment includes a lumbar support 20 and a cushion part 10 that is located below the lumbar support 20 and has a seat part 11 on which a user sits.

First, the cushion section 10 will be described. As shown in FIG. 1, the cushion section 10 comprises a seat section 11 extending horizontally and a lumbar support section 12 extending upward from the seat section 11. The cushion section 10 is made of a flexible material. For example, the cushion section 10 is made of urethane foam.

As an example, the cushion section 10 is formed by urethane molding. When the cushion section 10 is formed by urethane molding using urethane foam, the cushion section 10 made of a flexible material can be easily manufactured. The cushion section 10 is used, for example, housed in a cover.

The flexible material may include a thermoplastic elastomer. The flexible material may be a material with enough elasticity to deform in response to the load applied when the body is placed on it. The flexible material may be a resin (e.g., polypropylene, polyester, or polyethylene) that deforms when the body is placed on it and receives a load. The type of flexible material may be changed as appropriate.

Figure 2 is a plan view showing the cushion 1. As shown in Figures 1 and 2, the seating portion 11 extends in a first direction D1 and a second direction D2 intersecting the first direction D1. The first direction D1 is the left-right direction when seen by a user sitting on the seating portion 11, and the second direction D2 is the front-rear direction when seen by a user sitting on the seating portion 11. The seating portion 11 has a thickness in a third direction D3 intersecting both the first direction D1 and the second direction D2. For example, the third direction D3 is a vertical direction.

In the following, the forward direction as seen by a user seated on the seating portion 11 may be referred to as the "front," "front side," or "forward," and the opposite direction to the forward direction may be referred to as the "rear," "rear side," or "rear." However, these directions are for convenience of explanation and do not limit the position or orientation of each part.

The seating portion 11 has a buttocks support portion 13 on which the user's buttocks are placed, and a thigh support portion 14 on which the user's thighs are placed. The buttocks support portion 13 and the thigh support portion 14 are arranged to be aligned along the second direction D2. The buttocks support portion 13 has a pair of ischium support portions 15 that support the ischium of the user seated on the seating portion 11.

For example, the seating portion 11 has an air vent 11b. The air vent 11b is formed, for example, on the upper surface of the buttocks support portion 13 and the upper surface of the thigh support portion 14. The air vent 11b penetrates the seating portion 11 in the third direction D3, for example. The upper end of the inner wall defining the air vent 11b may be chamfered to be rounded. In a plan view, multiple air vents 11b are arranged in a line from the rear to the front.

For example, in a plan view (plan view when the lumbar support section 12 is oriented to be located above the seat section 11), multiple (six, for example) air vents 11b may be arranged on each side (left and right sides) of the first direction D1. For example, three air vents 11b are formed on each side of the first direction D1.

For example, two ventilation holes 11b are arranged along the first direction D1, and the distance between the two ventilation holes 11b arranged along the first direction D1 increases from the buttocks support section 13 toward the thigh support section 14 (toward the front). As an example, the multiple ventilation holes 11b are arranged so as to form a V-shape in a plan view.

For example, in the cushion section 10, the ischial support section 15 is formed by urethane molding, and the air vent 11b is formed by punching. In this case, the part of the mold used to manufacture the cushion section 10 that forms the air vent 11b can be eliminated, and the shape of the mold can be simplified. Furthermore, when liquid urethane is molded using the mold, an escape route for the air in the liquid urethane can be secured, allowing the cushion section 10 to have a nice finish.

The ischium support portion 15 is formed on the upper surface of the buttock support portion 13 and is recessed in the buttock support portion 13. The buttock support portion 13 has a pair of ischium support portions 15 aligned along the first direction D1. The ischium support portion 15 has a recess recessed from the upper surface of the buttock support portion 13. The shape of the ischium support portion 15 in a plan view has a long axis and a short axis. For example, the shape of the ischium support portion 15 in a plan view is an oval shape (one example is an ellipse). However, the shape of the ischium support portion 15 in a plan view is not limited to an oval shape or an ellipse shape, and may be a rectangle, a rectangle with rounded corners, a diamond shape, or a diamond shape with rounded corners, and can be changed as appropriate.

The intersection point where the extension of the long axis of one of the pair of ischial support parts 15 intersects with the extension of the long axis of the other of the pair of ischial support parts 15 is located closer to the thigh support part 14 (more forward) than the pair of ischial support parts 15. As a result, the pair of ischial support parts 15 have an inverted V shape in plan view (plan view when the lumbar support part 12 is oriented to be located above the seating part 11).

The ischial support portion 15 may also have a through hole that passes through the buttock support portion 13 in the third direction D3. In this case, the ischial support portion 15 has an inner wall that defines the through hole and a tapered surface that is located between the inner wall and the upper surface of the buttock support portion 13. For example, the area of the ischial support portion 15 when viewed from above is larger than the area of the ischial support portion 15 when viewed from below.

The seating portion 11 may have an inclined surface that extends obliquely from the buttocks support portion 13 toward the thigh support portion 14. The inclined surface extends obliquely upward from the buttocks support portion 13 toward the thigh support portion 14. The inclined surface is inclined with respect to the second direction D2 so that the seating portion 11 becomes thicker from the buttocks support portion 13 toward the thigh support portion 14. The seating portion 11 has a pair of thigh support portions 14 aligned along the first direction D1, and a convex portion 16 located between the pair of thigh support portions 14. The convex portion 16 indicates a portion that protrudes upward between the pair of thigh support portions 14.

The back of the user's thigh is placed on the thigh support part 14. The thigh support part 14 supports the back of the user's thigh. For example, the thigh support part 14 has a recess that is recessed in the thickness direction of the cushion part 10 (third direction D3). The recess of the thigh support part 14 is formed, for example, on each of the upper and lower surfaces of the cushion part 10. For example, the recess formed on the lower surface of the cushion part 10 in the thigh support part 14 defines a space between the support surface on which the cushion 1 is placed. This space makes it easier for the thigh support part 14 to sink when the thigh is placed on it.

The lumbar support portion 12 extends upward from the end (rear end) of the seat portion 11 in the second direction D2. The lumbar support portion 12 has a sacrum support portion 19 located, for example, in the center in the first direction D1. The sacrum support portion 19 has a convex shape that protrudes forward. That is, the sacrum support portion 19 protrudes forward at the lumbar support portion 12. As an example, the shape of the sacrum support portion 19 seen from the front has a shape with a major axis and a minor axis. For example, the shape of the sacrum support portion 19 seen from the front is an oval shape (an elliptical shape, for example).

For example, the sacrum support part 19 has a protruding surface 19b that is curved and protrudes forward. The height of the protruding surface 19b from the front surface of the lumbar support part 12 increases from the outer edge of the protruding surface 19b toward the inside of the protruding surface 19b. For example, the sacrum support part 19 may have a recessed part 19c that is recessed rearward from the protruding surface 19b. The recessed part 19c is a portion into which the sacrum of the user of the cushion 1 fits.

The recessed portion 19c extends in the first direction D1 and the third direction D3. For example, the length of the recessed portion 19c in the third direction D3 is longer than the length (width) of the recessed portion 19c in the first direction D1. The shape of the recessed portion 19c when viewed along the second direction D2 may be a groove shape (or an oval shape) extending in the third direction D3.

The seating portion 11 has a pair of protrusions 17 located at both ends in the first direction D1 as viewed from the thigh support portion 14. The protrusions 17 extend from each of the pair of thigh support portions 14 to the lumbar support portion 12. As shown in Figures 1 and 3, the protrusions 17 extend from both ends of the thigh support portion 14 in the first direction D1 toward the lumbar support portion 12.

The convex portion 17 is curved so as to rise upward toward the center of the first direction D1 in the lumbar support portion 12. That is, when viewed along the second direction D2, the height of the convex portion 17 relative to the thigh support portion 14 increases as it approaches the center of the first direction D1. For example, when viewed along the second direction D2, the convex portion 17 has a mountain shape (or an inverted U shape).

In the cushion 1, the lumbar support 20 is placed on the convex portion 17 of the cushion portion 10. The underside of the lumbar support 20 is curved so as to concave upward as it approaches the center in the first direction D1. When viewed along the second direction D2, the height of the underside of the lumbar support 20 increases as it approaches the center in the first direction D1. For example, when viewed along the second direction D2, the underside of the lumbar support 20 has a mountain shape (or an inverted U shape).

As described above, the shape of the underside of the lumbar support 20 follows the shape of the upper surface of the convex portion 17. Therefore, the lumbar support 20 can be easily placed on the cushion portion 10 by contacting the underside of the lumbar support 20 with the upper surface of the convex portion 17 of the cushion portion 10. Furthermore, it is also possible to easily remove the lumbar support 20 from the cushion portion 10. The lumbar support 20 may be used together with the cushion portion 10, or the lumbar support 20 may be used alone. The lumbar support 20 may be fastened to the backrest of a chair, or the lumbar support 20 may be used while fastened to the chair.

Next, the lumbar support 20 will be described with reference to Figures 2 to 4. Figure 4 is a front view showing the lumbar support 20. The lumbar support 20 has a lumbar support section 21 that supports the lumbar vertebrae of the user from behind, and a pair of side sections 23 located on both the left and right sides of the user as viewed from the user whose lumbar vertebrae are supported by the lumbar support section 21. Furthermore, the lumbar support 20 has a pair of connection sections 22 that extend from the lumbar support section 21 to each of the pair of side sections 23.

For example, the lumbar support 20 has an M-shape in plan view (when viewed along the third direction D3). In this case, the part protruding downward in plan view from the center of the M is the lumbar support part 21, and the parts extending up and down in plan view from both ends of the M are the sides 23. The parts extending from the upper ends of the sides 23 of the M in plan view to the lumbar support part 21 are the connection parts 22.

The lumbar support 20 is made of a flexible material. For example, the material of the lumbar support 20 is the same as the material of the cushion portion 10. In this case, the lumbar support 20 can be manufactured even more easily. For example, the lumbar support 20 is formed by urethane molding made of urethane foam. The lumbar support 20 is used, for example, housed in a cover material. Note that the lumbar support 20 may be used alone housed in the cover material, or may be used together with the cushion portion 10 housed in the cover material.

The lumbar support part 21 is formed in a portion of the lumbar support 20 including the center in the first direction D1. The lumbar support part 21 has a convex shape that protrudes forward. That is, the lumbar support part 21 protrudes forward from the front surface (the surface facing the front) of the lumbar support 20. For example, the lumbar support part 21 has a protruding part 21b that protrudes toward the back of the user, and a first recess 21c that is recessed from the protruding part 21b and extends along the third direction D3, which is the height direction of the user's body.

For example, the protrusion 21b has a curved surface that protrudes forward. The protruding height of the protrusion 21b on the front surface of the lumbar support 20 increases as it approaches the center of the lumbar support 20 in the first direction D1. The first recess 21c is a portion that is recessed rearward from the protrusion 21b. The lumbar support portion 21 is located directly above the sacrum support portion 19 when the lumbar support 20 is placed on the cushion portion 10.

The first recess 21c is the portion into which the lumbar vertebrae of the user of the lumbar support 20 fit. In addition, by visually checking the first recess 21c, the user can easily understand that the lumbar support 20 should be attached so that the lumbar vertebrae fit into the first recess 21c. In other words, the first recess 21c can be used as a marker for the lumbar support portion 21. The same applies to the depression 19c of the sacrum support portion 19.

In a plan view (when the lumbar support 20 is viewed in the third direction D3 in an orientation in which the lumbar support 20 appears M-shaped), the connection portion 22 extends obliquely upward from the lumbar support portion 21. That is, each of the pair of connection portions 22 extends obliquely backward from the lumbar support portion 21 as viewed from a user whose lumbar vertebrae are supported by the lumbar support portion 21.

The connection portion 22 has a plate-like shape in a planar view. For example, the thickness of the connection portion 22 in a planar view is thinner than the thickness of the side portion 23 in a planar view. As an example, the thickness of the connection portion 22 in a planar view is thinner than the thickness of the portion other than the connection portion 22 in a planar view. This allows the lumbar support portion 21 and the connection portion 22 to be easily deformed.

In this embodiment, the lumbar support 20 has a pair of apexes 26 located at the rear end of each connection portion 22. The apexes 26 are located at the end opposite the lumbar support portion 21 when viewed from the connection portion 22. When the lumbar support 20 is worn by a user, the height of the connection portion 22 increases as it moves away from the lumbar support portion 21, with the apexes 26 being the highest. In a plan view, the pair of apexes 26 correspond to a pair of protrusions located at the upper end of the M-shape of the lumbar support 20.

The side portions 23 extend forward from the top portion 26. Each of the pair of side portions 23 has an inner surface 23b that faces the user. Each side portion 23 has an ilium-facing portion 24 that faces the user's ilium. Furthermore, in a plan view, the end of the ilium-facing portion 24 opposite the top portion 26 has an inclined surface that extends diagonally forward from the ilium-facing portion 24 and an end surface that is located on the opposite side of the ilium-facing portion 24 when viewed from the inclined surface.

For example, the ilium-facing portion 24 has an ilium support portion 24c that protrudes from the inner surface 23b and supports the user's ilium, and a second recess 24b that is recessed from the ilium support portion 24c. For example, the ilium support portion 24c has a curved surface that protrudes toward the inside of the lumbar support 20 in a plan view. For example, the second recess 24b is a hole formed in the ilium support portion 24c. As an example, the second recess 24b extends in a direction that is inclined with respect to both the first direction D1 and the second direction D2.

The second recess 24b is a portion into which at least a portion of the user's ilium fits. Also, by visually checking the second recess 24b, the user of the lumbar support 20 can easily understand that the lumbar support 20 should be attached so that the ilium fits into the second recess 24b. In other words, like the first recess 21c and the like described above, the second recess 24b can be used as a marker for the ilium support portion 24c.

Each of the pair of side portions 23 has a rib support portion 25 that protrudes from the inner surface 23b at a position between the lumbar support portion 21 and each of the pair of iliac support portions 24c. The rib support portion 25 is a portion that supports the lower portion of the ribs of the user of the lumbar support 20. The rib support portion 25 protrudes in a curved shape from the inner surface 23b. In a plan view, the rib support portion 25 protrudes, for example, in an arc shape from the inner surface 23b. For example, the lower ends of the user's ribs are supported by the pair of rib support portions 25.

Next, the effects obtained from the cushion 1 according to this embodiment will be described. As shown in FIG. 5, the lumbar support 20 has a lumbar support section 21 that supports the lumbar vertebrae of the user from behind, and a pair of side sections 23 located on the left and right sides of the user, and each side section 23 and the lumbar support section 21 are connected to each other via a connection section 22. The lumbar support 20 is made of a flexible material, and each of the pair of connection sections 22 extends diagonally backward from the lumbar support section 21 and has a plate shape in a plan view. Therefore, when the lumbar vertebrae of the user abuts against the lumbar support section 21, the pair of connection sections 22 bend backward, and the pair of side sections 23 move in a direction approaching each other and approach both sides of the user's waist. Therefore, while the lumbar support section 21 supports the user's back and lumbar vertebrae, the pair of side sections 23 can support the left and right sides of the user's waist. As a result, the left and right sides of the user's back and waist are firmly supported, and the user's posture can be improved.

In this embodiment, each of the pair of side portions 23 may have an inner surface 23b facing the user, and an iliac support portion 24c protruding from the inner surface 23b and supporting the user's iliac bone. In this case, the user's iliac bone comes into contact with each of the pair of iliac support portions 24c, and each of the user's left and right iliac bones is supported by each of the iliac support portions 24c. By supporting each of the user's iliac bones, the user's lower back can be more firmly supported.

In this embodiment, the lumbar support part 21 may have a protruding part 21b that protrudes toward the back of the user, and a first recess 21c that is recessed from the protruding part 21b and extends along the height direction of the user's body. In this case, the user's lumbar vertebrae can be gently supported by fitting into the first recess 21c. Furthermore, by visually checking the first recess 21c of the lumbar support part 21, the user can understand that the lumbar vertebrae should be supported by the lumbar support part 21. In other words, the first recess 21c can be used as a marker for the lumbar support part 21.

In this embodiment, each of the pair of side portions 23 may have a rib support portion 25 that protrudes from the inner surface 23b at a position between the lumbar support portion 21 and each of the pair of iliac support portions 24c and supports the lower part of the user's ribs. In this case, the lower part of the user's ribs can be supported by the pair of rib support portions 25 located between the lumbar support portion 21 and each of the pair of iliac support portions 24c.

In the lumbar support 20, each of the pair of side portions 23 has an inner surface 23b facing the user, an ilium support portion 24c that protrudes from the inner surface 23b and supports the user's ilium, and a second recess 24b recessed from the ilium support portion 24c. Therefore, the user's ilium can be gently supported by fitting into the second recess 24b. Furthermore, by visually checking the second recess 24b of the ilium support portion 24c, the user can understand that the ilium should be supported by the ilium support portion 24c. In other words, the second recess 24b can be used as a marker for the ilium support portion 24c.

As shown in Figures 1 to 3, the cushion 1 according to this embodiment includes a lumbar support 20 and a cushion part 10 that is located below the lumbar support 20 and has a seating part 11 on which a user sits. The cushion 1 includes the lumbar support 20. Therefore, the same effect as the lumbar support 20 described above can be obtained. Furthermore, the cushion 1 includes the cushion part 10 that is located below the lumbar support 20 and has the seating part 11. Therefore, the back and waist of a user seated on the seating part 11 can be firmly supported, so that the user's posture can be more reliably maintained.

The above describes embodiments of the lumbar support and cushion according to the present disclosure. However, the present disclosure is not limited to the contents of the above-mentioned embodiments, and can be modified as appropriate within the scope of the gist described in the claims. In other words, the shape, size, number, material, and arrangement of each part of the lumbar support and cushion according to the present disclosure can be modified as appropriate within the scope of the above gist.

In the above embodiment, the lumbar support 20 is described as having a side portion 23 having an ilium facing portion 24 and a rib support portion 25. However, the lumbar support may have a side portion that does not have at least either the ilium facing portion 24 or the rib support portion 25. Also, in the above embodiment, the lumbar support 20 is described as having an M-shape in a plan view. However, the lumbar support may not have an M-shape in a plan view, and the shape of the lumbar support may be changed as appropriate within the scope of the above-mentioned gist. For example, the lumbar support may not have at least either the first recess 21c or the second recess 24b.

For example, in the above embodiment, the cushion 1 is described as including the cushion portion 10 and the lumbar support 20 that is detachable from the cushion portion 10. However, the cushion according to the present disclosure may be a cushion in which the cushion portion 10 and the lumbar support 20 are integrated. The cushion according to the present disclosure may be a cushion in which the cushion portion 10 and the lumbar support 20 are integrally formed.

In the above embodiment, an example was described in which the cushion portion 10 includes a seat portion 11 and a lumbar support portion 12, and the seat portion 11 includes a buttocks support portion 13 and a thigh support portion 14. However, the configuration of the cushion portion connected to the lumbar support according to the present disclosure is not limited to the above example. In other words, the shape, size, material, number and arrangement of each part of the cushion portion can be changed as appropriate within the scope of the above-mentioned gist.

1...cushion, 10...cushion portion, 11...seating portion, 11b...ventilation hole, 12...lumbar support portion, 13...buttocks support portion, 14...thigh support portion, 15...ischium support portion, 16, 17...convex portion, 19...sacrum support portion, 19b...protruding surface, 19c...recessed portion, 20...lumbar support, 21...lumbar support portion, 21b...protruding portion, 21c...first recess, 22...connecting portion, 23...side portion, 23b...inner surface, 24...iliac bone facing portion, 24b...second recess, 24c...iliac bone support portion, 25...rib support portion, 26...top, D1...first direction, D2...second direction, D3...third direction.

Claims (6)

A lumbar support made of a flexible material,
A lumbar support part that supports the lumbar vertebrae of the user from behind;
A pair of side portions located on both the left and right sides of the user when viewed from the user on which the lumbar vertebrae are supported by the lumbar support portion;
A pair of connection portions extending from the lumbar support portion to each of the pair of side portions;
Equipped with
Each of the pair of connection parts extends obliquely rearward from the lumbar support part when viewed from the user whose lumbar vertebrae are supported by the lumbar support part, and has a plate shape in a plan view.
Lumbar support. Each of the pair of side portions has an inner surface facing the user, and an iliac support portion protruding from the inner surface and supporting the ilium of the user.
The lumbar support according to claim 1. The lumbar support portion has a protruding portion protruding toward the back of the user, and a first recessed portion recessed from the protruding portion and extending along the height direction of the body of the user.
A lumbar support according to claim 1 or 2. Each of the pair of side portions has a rib support portion protruding from the inner surface at a position between the lumbar support portion and each of the pair of iliac support portions, and supporting a lower portion of the ribs of the user.
The lumbar support according to claim 2. A lumbar support made of a flexible material,
A lumbar support part that supports the lumbar vertebrae of the user from behind;
A pair of side portions located on both the left and right sides of the user when viewed from the user on which the lumbar vertebrae are supported by the lumbar support portion;
A pair of connection portions extending from the lumbar support portion to a pair of side portions, respectively;
Equipped with
Each of the pair of side portions has an inner surface facing the user, an iliac support portion protruding from the inner surface and supporting the ilium of the user, and a second recess recessed from the iliac support portion.
Lumbar support. A lumbar support according to claim 1 or 5;
A cushion portion located under the lumbar support and having a seat portion on which the user sits;
Equipped with
cushion.

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