JP2010005199A - Cushion and air cells - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cushion and air cells which effectively prevent a bed sore and have improved function for stabilizing the posture of a seated person. <P>SOLUTION: In the cushion, the vicinity of the ischial bones and coccygeal bone is softly supported by first air cells 10 vertically and horizontally, and since a second air cell 20 has an area three or more times that of the first air cell 10 in the plane view, the second air cell 20 supports the perineal area to effectively prevent the bed sore without any problems even when vertical rigidity of the second air cell 20 may be larger than those of the first air cells 10. The second air cell 20 fits among the ischial bones, the lower end surface of the perineal area, and both thighs, and movement of the buttocks in the width direction of a seat surface is restricted by the second air cell 20. Therefore such a configuration effectively prevents the bed sore and improves the function for stabilizing the posture of the seated person. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cushion and an air cell that are placed on a seating surface of a wheelchair, for example, and softly support the seated person in order to prevent pressure ulcers generated by the seated person.

In general, as this type of cushion, a flat base member and a seating surface are provided so as to be aligned with each other in the front-rear direction and the width direction, and are provided so as to extend upward from the upper surface side of the base member, A plurality of first air cells that support the seat bone and the vicinity of the tailbone, and air cell groups each of which is provided on both sides of the seating surface in the width direction, respectively, and upward from the upper surface side of the base member. Each of which has an area about three times that of the first air cell in plan view, and the front-rear dimension of the seating surface is larger than the width dimension, and the width direction of the seated person's buttocks A device including a plurality of second air cells that are supported from both sides to the outside of both thighs is known (see, for example, Patent Document 1).
Japanese Patent No. 4010557

  By the way, in the cushion, since pressure is likely to be high in the vicinity of the scapula and coccyx in the seated person's buttocks, pressure ulcers are likely to occur. Therefore, each of the first air cells that support this portion has a vertically long air bag with a small area in plan view. And the vicinity of the ischia and coccyx is softly supported in the vertical and horizontal directions. On the other hand, if the entire buttocks are softly supported in the vertical direction and the horizontal direction, the seat occupant's buttocks move easily in the horizontal direction, and the posture of the seat occupant becomes unstable on the cushion. Each second air cell having a certain area is provided on both sides in the width direction of the first air cell group, and supported by each second air cell from both sides in the width direction of the seated person's buttocks to the outside of both thighs. Since the air cell tends to increase the rigidity in the horizontal direction by increasing the area in plan view, the movement of the seated person's buttocks in the horizontal direction can be suppressed by each second air cell, and the posture of the seated person Can be stabilized. That is, this type of cushion is required to have both a pressure ulcer prevention function and a seated posture stabilization function, and further improvement is desired even now.

  The present invention has been made in view of the above problems, and the object thereof is to provide a cushion and an air cell that can effectively prevent pressure ulcers and can improve the posture stabilization function of a seated person. Is to provide.

  In order to achieve the above-mentioned object, the present invention provides a cushion that is placed on a predetermined seating surface and supports a seated person, and is provided so as to be aligned in a horizontal direction with a flat base member. A plurality of first air cells that are provided so as to extend upward from the upper surface side, and that support the vicinity of the seat bone and tailbone of the seated person, and are provided so as to extend upward from the upper surface side of the base member. It has an area three times or more in plan view with respect to one air cell, and the dimension in the front-rear direction of the seating surface is larger than the dimension in the front-rear direction of the seating surface of each first air cell. And a second air cell that supports at least a part of the perineum of the seated person and the inside of both thighs.

  As a result, a plurality of first air cells are provided so as to be aligned in the horizontal direction, and each first air cell is provided so as to extend upward from the upper surface side of the base member, so that the vicinity of the seated person's scapula and coccyx can be seen. For example, by forming each first air cell from an air bag having a small area in plan view, the vicinity of the sciatic bone and the tailbone can be softly supported in the vertical direction and the horizontal direction.

  In addition, a second air cell having an area three times or more in plan view with respect to each first air cell is provided, and the dimension of the second air cell in the front-rear direction of the seating surface is larger than the dimension of the front-rear direction of the seating surface of each first air cell. In addition to being formed large, it is disposed substantially at the center in the seating surface width direction, and supports at least a part of the perineum of the seated person and a part of the inside of both thighs.

  Here, the inner area on the lower end side of the bone constituting the pelvis, for example, the inner area on the lower end side of the sciatic bone, pubic bone, iliac bone, tailbone, sacrum, etc. is called the perineum, and the perineum has bones in it. It is composed only of soft tissues such as muscle, fat, and rectum. In addition, there is a pubic joint on the front side of the perineum in the pelvis, and the lower end side of the pelvis is concave in the vicinity of the pubic joint. On the other hand, since the second air cell is provided to support the perineum of the seated person and the inside of both thighs, the second air cell is located below the perineum and the soft tissues of both thighs and the pubic joint. Be placed. For this reason, even when the second air cell has an area three times or more in plan view with respect to each first air cell, the vertical rigidity of the second air cell is higher than the vertical rigidity of each first air cell. There is no particular problem in effectively preventing the occurrence of pressure ulcers.

  In addition, the sciatic bone is arranged on both sides in the seating surface width direction with respect to the pubic bone connection, and the shape of the lower end surface of the perineum part is concave on the center side in the seating surface width direction. The second air cell is fitted between the lower end surface and both thighs, and the second air cell is deformed in the seating surface width direction along with the movement of the perineum and both thighs. Here, since the second air cell has an area three times or more in plan view with respect to each first air cell, the rigidity in the seating surface width direction of the second air cell is higher than each first air cell, and the seating of the buttocks Movement in the surface width direction is suppressed by the second air cell.

  Further, the present invention provides a cushion that is placed on a predetermined seating surface and supports a seated person, and is provided so as to be aligned in a horizontal direction with a flat base member, and upward from the upper surface side of the base member, respectively. A plurality of first air cells that are provided to extend toward the seat and support the vicinity of the seat bone and tailbone of the seated person, and are provided to extend upward from the upper surface side of the base member, and for each first air cell It has an area that is three times or more in plan view, and the dimension in the front-rear direction of the seating surface is larger than the dimension in the front-rear direction of the seating surface of each first air cell. And a second air cell in which the centroid in plan view is disposed in the rear half of the base member in the longitudinal direction of the seating surface. Eteiru.

  As a result, a plurality of first air cells are provided so as to be aligned in the horizontal direction, and each first air cell is provided so as to extend upward from the upper surface side of the base member, so that the vicinity of the seated person's scapula and coccyx can be seen. For example, by forming each first air cell from an air bag having a small area in plan view, the vicinity of the sciatic bone and the tailbone can be softly supported in the vertical direction and the horizontal direction.

  In addition, a second air cell having an area three times or more in plan view with respect to each first air cell is provided, and the dimension of the second air cell in the front-rear direction of the seating surface is larger than the dimension of the front-rear direction of the seating surface of each first air cell. In addition to being formed at the center of the seating surface width direction, a part thereof is disposed in the front half of the seating member longitudinal direction of the base member, and the centroid in plan view is the seating surface longitudinal direction of the base member. Arranged in the second half. For this reason, although there are variations depending on the body shape of the seated person, at least a part of the perineal part of the seated person and a part of the inside of both thighs are often supported by the second air cell.

  Here, the inner area on the lower end side of the bone constituting the pelvis, for example, the inner area on the lower end side of the sciatic bone, pubic bone, iliac bone, tailbone, sacrum, etc. is called the perineum, and the perineum has bones in it. It is composed only of soft tissues such as muscle, fat, and rectum. In addition, there is a pubic joint on the front side of the perineum in the pelvis, and the lower end side of the pelvis is concave in the vicinity of the pubic joint. On the other hand, since the second air cell is provided to support the perineum of the seated person and the inside of both thighs, the second air cell is located below the perineum and the soft tissues of both thighs and the pubic joint. Be placed. For this reason, even when the second air cell has an area three times or more in plan view with respect to each first air cell, the vertical rigidity of the second air cell is higher than the vertical rigidity of each first air cell. There is no particular problem in effectively preventing the occurrence of pressure ulcers.

  In addition, the sciatic bone is arranged on both sides in the seating surface width direction with respect to the pubic bone connection, and the shape of the lower end surface of the perineum part is concave on the center side in the seating surface width direction. The second air cell is fitted between the lower end surface and both thighs, and the second air cell is deformed in the seating surface width direction along with the movement of the perineum and both thighs. Here, since the second air cell has an area three times or more in plan view with respect to each first air cell, the rigidity in the seating surface width direction of the second air cell is higher than each first air cell, and the seating of the buttocks Movement in the surface width direction is suppressed by the second air cell.

  The air cell of the present invention has a flat base member and a plurality of air cells provided so as to extend upward from the upper surface side of the base member, and is placed on a predetermined seating surface to support a seated person. Among the air cells of the cushion, the air cell at the center in the width direction disposed at the substantially center in the seating surface width direction on the base member, and formed to extend upward from the upper surface side of the base member While having a bag, it is formed so that the size of the air bag in the front-rear direction of the seating surface is 100 mm or more, and a part of the air bag is disposed in the front half of the seat member in the front-back direction of the base member. The centroid as viewed is arranged in the rear half of the seating surface front-rear direction of the base member.

  Accordingly, since the plurality of air cells are provided so as to extend upward from the upper surface side of the base member, the air cell that supports the vicinity of the seat bone and the tailbone of the seated person can be used, for example, an air bag having a small area in plan view. It is possible to softly support the vicinity of the ischia and coccyx in the vertical direction and the horizontal direction.

  In addition, one air cell is arranged at the approximate center in the seating surface width direction on the base member, and the air cell in the center in the width direction has an air bag formed so as to extend upward from the upper surface side of the base member, The air bag seating surface longitudinal dimension is formed to be 100 mm or more, and a part of the air bag is disposed in the front half of the base member seating surface longitudinal direction, and the centroid in plan view of the air bag is It is arrange | positioned in the latter half part of the seating surface front-back direction of a base member. For this reason, although there are variations depending on the body shape of the seated person, at least a part of the perineum of the seated person and a part of the inside of both thighs are often supported by the air cell at the center in the width direction.

  Here, the inner area on the lower end side of the bone constituting the pelvis, for example, the inner area on the lower end side of the sciatic bone, pubic bone, iliac bone, tailbone, sacrum, etc. is called the perineum, and the perineum has bones in it. It is composed only of soft tissues such as muscle, fat, and rectum. In addition, there is a pubic joint on the front side of the perineum in the pelvis, and the lower end side of the pelvis is concave in the vicinity of the pubic joint. On the other hand, since the air cell in the center in the width direction is provided to support the perineum of the seated person and the inside of both thighs, the air cell in the center in the width direction is connected to the soft tissue and the pubic bone of the perineum and both thighs. Placed on the underside. Therefore, even when the vertical rigidity of the air cell at the center in the width direction is higher than the vertical rigidity of other air cells arranged in the vicinity thereof, there is no particular problem in effectively preventing the occurrence of pressure ulcers. .

  In addition, the sciatic bone is arranged on both sides in the seating surface width direction with respect to the pubic bone connection, and the shape of the lower end surface of the perineum part is concave on the center side in the seating surface width direction. The air cell at the center in the width direction is fitted between the lower end surface and both thighs, and the air cell at the center in the width direction is deformed in the seating surface width direction with the movement of the perineum and both thighs. For this reason, if the stiffness in the seating surface width direction of the air cell at the center in the width direction becomes higher than the stiffness in the seating surface width direction of other air cells arranged in the vicinity thereof, the movement of the buttocks in the seating surface width direction is It will be suppressed by the air cell.

  According to the present invention, the first air cell can softly support the vicinity of the ischia and coccyx in the vertical and horizontal directions, and the second air cell has an area three times or more in plan view with respect to each first air cell. Even if the vertical rigidity of the second air cells is higher than the vertical rigidity of the first air cells, there is no particular problem in effectively preventing the occurrence of pressure sores. Since the second air cell fits between the lower end surface of the perineum and both thighs, and the movement of the buttocks in the seating surface width direction is suppressed by the second air cell, the pressure sore can be effectively prevented, and the seating The posture stabilization function of the person can be improved.

  1 to 6 show an embodiment of the present invention. FIG. 1 is a plan view of the cushion, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a view of the cushion with the bottom cover removed. FIG. 4 is a perspective view of the second air cell, FIG. 5 is a plan view of the second air cell, and FIG. 6 is a schematic view of the skeleton in the vicinity of the pelvis. The explanation of directions in the following text is based on the directions shown in FIGS. Moreover, the left-right direction corresponds to the width direction of the seating surface. In addition, the plan view in the following description means that the cushion is viewed from above as shown in FIG. 1, and the description relating to the comparison of the rigidity of the air cell in the following description is that the air pressure in the air cell is 10 kPa (relative pressure to the external pressure). ) Is assumed.

  The cushion includes a plurality of first air cells 10 provided to support the vicinity of the seat bone and tailbone of the seated person, a second air cell 20 having a large area in plan view with respect to the first air cell 10, and each of the first air cells 10. A pair of third air cells 30 disposed on both sides in the seating surface width direction and on the rear end side of the seating surface with respect to the first air cell group comprising one air cell 10, and both sides in the seating surface width direction with respect to the first air cell group; A pair of fourth air cells 40 disposed on the front end side of the seating surface with respect to each third air cell 30, and in front of the seating surface with respect to each first air cell 10, second air cell 20, each third air cell 30, and each fourth air cell 40 Front end side support member 50 provided on the end side, each first air cell 10, second air cell 20, each third air cell 30, each fourth air cell 40, and front end side support member 5 And a lower end side and a base member 60 for supporting respectively. The seating surface is, for example, a seating surface of a wheelchair, and this cushion is used by being placed on the seating surface in order to softly support a seated person.

  Each first air cell 10 is formed of an air bag having an open lower end, and the air bag is formed of a flexible material such as rubber or plastic. The air bag of the first air cell 10 of the present embodiment has a side surface formed in a cylindrical shape, but the side surface can also be formed in a polygonal cylindrical shape, and can be formed in other shapes. . Further, in order to softly support the vicinity of the ischia and coccyx by each first air cell 10, the maximum width of the side surface portion in the air bag of the first air cell when the internal air pressure becomes 10 kPa (relative pressure to the external air pressure) (In this embodiment, the maximum outer diameter dimension) is preferably 30 mm or more and 60 mm or less.

  The second air cell 20 includes an air bag 21 whose lower end is open and a bottom member 22 to which an opening edge of the air bag 21 is attached. The air bag 21 is made of a flexible material such as rubber or plastic. The bottom member 22 is made of rubber or plastic, and a plurality of lower protrusions 22a having a circular cross section are provided on the lower surface of the bottom member 22. The bottom member 22 is provided with a through hole 22b penetrating from the upper surface thereof to the lower surface of the lower protruding portion 22a.

  The air bag 21 of the second air cell 20 has an area three times or more in plan view with respect to the air bag of the first air cell 10 and has a wall thickness equivalent to that of the air bag of the first air cell 10. For this reason, the air bag 21 of the second air cell 20 has a higher horizontal rigidity than the air bag of the first air cell 10, and the vertical rigidity tends to be higher. The air bag 21 has a dimension in the front-rear direction of the seating surface that is three times or more than the dimension in the front-rear direction of the air bag of the first air cell 10 and is formed to be symmetric in the seating surface width direction. Further, as shown in FIG. 5, the maximum dimension WR in the seating surface width direction of the rear half portion RP of the air bag 21 of the second air cell 20 in the seating surface longitudinal direction is the seating surface width direction of the front half portion FP in the seating surface longitudinal direction. More than twice the maximum dimension WF. The air bag 21 of the second air cell 20 fits between the concave portion on the lower surface of the perineum and the thighs as will be described later, and supports the inside of the perineum and both thighs. The maximum dimension WF of the FP is preferably 40 mm or more and 70 mm or less, and the dimension in the front-rear direction of the seating surface of the air bag 21 of the second air cell 20 is preferably 100 mm or more.

  Further, as shown in FIG. 1, the front end side of the air bag 21 of the second air cell 20 is disposed in the front half portion FA in the front-rear direction of the seating surface of the base member 60, and the centroid G in the plan view of the air bag 21 is The base member 60 is disposed in the rear half portion RA in the front-rear direction of the seating surface.

  Each third air cell 30 includes an air bag 31 whose lower end is open, and a bottom member (not shown) to which an opening edge of the air bag 31 is attached, like the second air cell 20. The air bag 31 is made of a flexible material such as rubber or plastic. The bottom member is made of rubber or plastic, and has a lower protrusion and a through-hole, like the bottom member 22 of the second air cell 20. The air bag 31 of each third air cell 30 has an area three times or more in plan view with respect to the air bag of the first air cell 10 and has a wall thickness equal to or greater than that of the air bag of the first air cell 10. The air bag 31 of each third air cell 30 supports both sides of the seated person's buttocks.

  Each fourth air cell 40 has an air bag 41 whose lower end is open, and a bottom member (not shown) to which an opening edge of the air bag 41 is attached, like the second air cell 20. The air bag 41 is made of a flexible material such as rubber or plastic. The bottom member is made of rubber or plastic, and has a lower protrusion and a through-hole, like the bottom member 22 of the second air cell 20. The air bag 41 of each fourth air cell 40 has an area three times or more in plan view with respect to the air bag of the first air cell 10 and has a wall thickness equal to or greater than that of the air bag of the first air cell 10. Each fourth air cell 40 supports both sides of the seated person's buttocks and supports the outside of the thigh.

  The front end side support member 50 is made of a sponge-like member such as urethane foam, and supports the vicinity of the thigh of the seated person.

  The base member 60 is made of rubber or plastic and has a flat plate shape. The base member 60 is formed by bonding an upper base member 60a formed in a flat plate shape and a lower base member 60b formed in a flat plate shape. The upper base member 60a is provided with a plurality of mounting holes 60c that open upward. The opening edge of the first air cell 10, the lower protrusion 22a of the second air cell 20, the third and fourth air cells When the lower protrusions are detachably fitted into the mounting holes 60c, the lower ends of the air cells 10, 20, 30, 40 are supported by the base member 60, and the air bags of the air cells 10, 20, 30, 40 are provided. Is provided so as to extend upward from the upper surface side of the base member 60. An air passage 60d is formed in the base member 60, and the air passage 60d communicates with each first air cell 10 through an opening of an air bag, and each air cell 20, 30 through each through hole. , 40. Further, the lower end surface of the front end side support member 50 is supported by the base member 60 by attaching the lower end surface of the front end side support member 50 to the upper surface of the front end portion 60 e of the base member 60 with a surface fastener, an adhesive, or the like. The front end portion 60e of the base member 60 has a thickness dimension larger than that of other portions, and the front end portion 60e is provided with a hollow portion 61 that opens downward.

  In the hollow portion 61, a pump 70 including a known electric air pump for supplying air to the air cells 10, 20, 30, 40, and first to seventh electromagnetic valves V1 to V7 having a known structure, A control device 80 comprising a well-known microcomputer is attached. The opening of the hollow portion 61 is closed by a plate-like bottom cover 61a made of plastic.

  Each air cell 10, 20, 30, 40 is connected to a pump 70 and each solenoid valve V1 to V7 via a communication pipe (not shown) and an air passage 60d in the base member 60, and each pump 70 and each solenoid valve V1 to V7 respectively. The amount of air in the air cells 10, 20, 30, 40 is arbitrarily adjusted. The pump 70 and the electromagnetic valves V1 to V7 are controlled by the control device 70.

  The cushion configured as described above is covered with, for example, a cloth cushion cover (not shown), and is used to softly support a seated person's buttocks and thighs. In addition, for example, when the occupant sits on the cushion, the amount of air in each air cell 10, 20, 30, 40 is automatically adjusted.

  Here, the cushion is provided with a plurality of first air cells 10 arranged in a horizontal direction, and each of the first air cells 10 is provided so as to extend upward from the upper surface side of the base member 60. Are arranged in a range AR1 in which the sciatic bone is arranged and in a range AR2 in which the tailbone of the seated person is arranged. The range AR1 and the range AR2 can be specified to some extent according to the body type, symptoms, and the like of the target seated person, and can be obtained from experience. Further, the range AR1 and the range AR2 also coincide with a range that is assumed that the ischium and the tailbone are arranged when the cushion is designed. Each first air cell 10 is preferably formed so that the maximum width of the side surface portion of the air bag is 30 mm or more and 60 mm or less, and is formed from an air bag having a small area in plan view. It can be softly supported in the horizontal direction.

  Further, a second air cell 20 having an area three times or more in plan view is provided for each first air cell 10, and the second air cell 20 has a dimension in the front-rear direction of the seating surface in the front-rear direction of the seating surface of the first air cell 10. It is formed to be larger than the dimension, and is disposed at substantially the center in the seating surface width direction, and a part thereof is disposed in the front half FA of the base member 60 in the front-rear direction of the seating surface. The seating surface 60 is arranged in the rear half portion RA in the front-rear direction. For this reason, although there are variations depending on the body shape of the seated person, at least a part of the perineum of the seated person and a part of the inside of both thighs are often supported by the second air cell 20.

  Here, as shown in FIG. 5, the inner range on the lower end side of the bone constituting the pelvis, for example, the inner range on the lower end side of the sciatic bone, pubic bone, iliac bone, tailbone, sacrum, etc. is called the perineum. The perineum has no bone and is composed only of soft tissues such as muscle, fat, and rectum. Further, the front side of the pelvis with respect to the perineum has a pubic joint, and the lower end of the pelvis is concave in the vicinity of the pubic joint. On the other hand, since the second air cell 20 is provided so as to support the inside of the perineum and both thighs of the seated person, the second air cell 20 is attached to the perineum and the soft tissues of both thighs and the pubic bone. Placed on the side. For this reason, when the second air cell 20 has an area three times or more in plan view with respect to the first air cell 10, the vertical rigidity of the second air cell 20 is higher than the vertical rigidity of the first air cell 10. Even in this case, there is no particular problem in effectively preventing the occurrence of pressure ulcers.

  In addition, the sciatic bone is arranged on both sides in the seating surface width direction with respect to the pubic bone connection, and the shape of the lower end surface of the perineum part is concave on the center side in the seating surface width direction. The second air cell 20 fits between the lower end surface and both thighs, and the second air cell 20 is deformed in the seating surface width direction with the movement of the perineum and both thighs. Here, since the second air cell 20 has an area three times or more in plan view with respect to the first air cell 10, the rigidity in the seating surface width direction of the second air cell 20 is higher than that of the first air cell 10, and the collar portion Is suppressed by the second air cell 20 in the seating surface width direction.

  As described above, according to the present embodiment, the first air cells 10 can softly support the vicinity of the ischia and coccyx in the vertical direction and the horizontal direction, and the second air cell 20 is planarly viewed with respect to the first air cell 10. In order to effectively prevent the occurrence of pressure sores even when the vertical rigidity of the second air cell 20 is higher than the vertical rigidity of each first air cell 10, There is no particular problem, and the second air cell 20 is fitted between the peritoneum, the lower end surface of the perineum and both thighs, and the movement of the buttocks in the seating surface width direction is suppressed by the second air cell 20. This can be effectively prevented and the posture stabilization function of the seated person can be improved.

  Further, since the second air cell 20 is formed symmetrically in the seating surface width direction, it is advantageous in stabilizing the posture of the seated person. In addition, if the second air cell 20 is formed substantially symmetrically in the seating surface width direction, it is possible to achieve the same operational effects as when symmetrical.

  Further, the air bag 21 of the second air cell 20 has a maximum dimension WR in the seating surface width direction of the rear half part RP in the seating surface longitudinal direction relative to the maximum dimension WF in the seating surface width direction of the front half part FP in the seating surface longitudinal direction. It is formed to be twice or more. Here, the perineum is supported by the latter half of the seating surface in the front-rear direction of the second air cell 20, and specifically, the front side of the perineum and the rear side of the seat bone in the perineum are supported. That is, the second half portion RP of the second air cell 20 in the front-rear direction of the seating surface can support, for example, the vicinity of the seat bone from the rear side, not from the lower side, and can support the iliac from the rear side or both sides in the width direction. Since this is possible, it is advantageous in stabilizing the posture of the seated person. In this embodiment, the maximum dimension WR is twice or more than the maximum dimension WF. However, if the maximum dimension WR is 1.5 or more times the maximum dimension WF, it is the same as this embodiment. It is possible to achieve the effect of the above, and it is preferable that the number is twice or more.

  In addition, since the air bag 21 of the second air cell 20 is formed so that the dimension in the front-rear direction of the seating surface is 100 mm or more, the air bag 21 of the second air cell 20 is surely extended from the perineum to the inside of both thighs. It is extremely advantageous for stabilizing the posture of the seated person.

  Moreover, since the size of the air bag 21 of the second air cell 20 is more than three times the size of the air bag of the first air cell 10 in the front-rear direction, the size of the air bag 21 of the second air cell 20 The horizontal rigidity can be set to be surely higher than the horizontal rigidity of the air bag of the first air cell 10, and the second air cell 20 is extremely advantageous in stabilizing the posture of the seated person. In order to ensure that the horizontal rigidity of the air bag 21 of the second air cell 20 is set to be higher than the horizontal rigidity of the air bag of the first air cell 10, the air bag 21 of the second air cell 20 has The dimension in the direction is preferably 2.5 times or more than the dimension in the front-rear direction of the air bag of the first air cell 10.

  Further, since the maximum dimension WF in the seating surface width direction in the front half portion FP of the air bag 21 of the second air cell 20 in the front-rear direction of the seating surface is 40 mm or more and 70 mm or less, the air bag 21 has a concave portion on the lower surface of the perineum part and It is easy to fit between both thighs, and is extremely advantageous in stabilizing the posture of the seated person.

  In addition, a pair of third air cells 30 and a pair of fourth air cells 40 are provided on both sides in the width direction with respect to the first air cell group, and the width direction of the seated person's buttocks by each of the third and fourth air cells 30 and 40 Both sides and the outside of both thighs are supported. Furthermore, each of the third and fourth air cells 30 and 40 has an area that is three times or more that of the first air cell 10 in plan view. The horizontal rigidity of the seating surface is higher than that of the air cell 10. For this reason, the movement of the seated person's buttocks in the horizontal direction is suppressed by each of the third and fourth air cells 30 and 40, and the seated person's posture can be further stabilized.

  As shown in FIGS. 7 to 12, the rear end of the second air cell 20 in the front-rear direction of the seating surface can be bifurcated in the seating surface width direction. In this case, a part of the rear end side of the second air cell 20 is formed so as to extend toward one side in the seating surface width direction and rearward of the seating surface, and another part of the rear end side of the second air cell 20 is formed. It forms so that it may extend toward the other side of a seating surface width direction, and the back of a seating surface. In this case, as shown in FIG.9 and FIG.11, the 1st air cell 10 can also be arrange | positioned between the parts bifurcated. Thereby, for example, even when the seated person is in a poor posture and seated in a state where the buttocks are displaced forward, it is possible to prevent the contact of the isch bone to the second air cell 20 and to reduce the contact pressure, and in the vicinity of the sit bone. The applied pressure can be reduced.

  Further, as shown in FIGS. 8 to 11, the second air cell 20 can be formed such that the height dimension gradually increases from the center in the longitudinal direction of the seating surface toward the front end. In this case, the forward movement of the seated person's buttocks is suppressed, which is extremely advantageous for stabilizing the posture of the seated person.

  Further, as shown in FIGS. 10 and 11, the second air cell 20 is formed so that the height dimension gradually increases from the center in the front-rear direction of the seating surface toward the front end, and from the center in the front-rear direction of the seating surface. It is also possible to form such that the height dimension gradually increases toward the end. In this case, the movement of the seated person's buttocks in the front-rear direction is suppressed, which is extremely advantageous in stabilizing the seated person's posture.

  Further, as shown in FIGS. 9 and 11, the height dimension of the two or more first air cells 10 arranged between the bifurcated portions is gradually increased toward the rear end side of the seating surface. It is also possible to form it. In this case, the backward movement of the seated person's buttocks is suppressed by each first air cell 10, which is extremely advantageous in stabilizing the seated person's posture.

  Further, as shown in FIGS. 8 to 10, a concave portion extending in the front-rear direction of the seating surface can be provided on the upper surface on the front end side of the second air cell 20.

  In the present embodiment, the areas of the first air cells 10 in the plan view are substantially equal to each other. On the other hand, it is also possible to provide a plurality of first air cells 10 having different areas in plan view. Even in this case, the dimension setting in the front-rear direction and the area setting in plan view of the second air cell 20 with respect to each first air cell 10 arranged in each of the ranges AR1 and AR2 to support the vicinity of the ischium and tailbone are as described above. In the case where the second air cell 20 has a dimension in the front-rear direction of 100 mm or more, the same effect as described above can be achieved.

  In the present embodiment, the second air cell 20 is composed of the air bag 21 and the bottom member 22, and the bottom member 22 is attached to the base member 60. However, the air bag 21 is not provided with the bottom member 22. The air bag of the first air cell 10 and the air bag 21 of the second air cell 20 can be formed integrally with the base member 60, and can be directly attached to the base member 60. Similarly to the second air cell 20, the bottom member can be provided on the base plate 10, and the bottom member can be attached to the base member 60. In these cases, the same effect as described above can be achieved.

The top view of the cushion which shows one Embodiment in this invention AA line sectional view in FIG. Bottom view of cushion with bottom cover removed Perspective view of the second air cell Plan view of the second air cell Schematic view of the skeleton near the pelvis The perspective view of the 2nd air cell which shows the 1st modification of this embodiment. The perspective view of the 2nd air cell which shows the 2nd modification of this embodiment. The perspective view of the 2nd air cell which shows the 3rd modification of this embodiment. The perspective view of the 2nd air cell which shows the 4th modification of this embodiment. The perspective view of the 2nd air cell which shows the 5th modification of this embodiment. The perspective view of the 2nd air cell which shows the 6th modification of this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... 1st air cell, 20 ... 2nd air cell, 21 ... Air bag, 30 ... 3rd air cell, 31 ... Air bag, 40 ... 4th air cell, 41 ... Air bag, 50 ... Front end side supporting member, 60 ... Base member , 70 ... pump, 80 ... control device, G ... centroid, FA ... first half, RA ... second half, FP ... first half, RP ... second half.

Claims (13)

In a cushion that is placed on a predetermined seating surface and supports a seated person,
A flat base member;
A plurality of first air cells that are provided so as to be arranged in a horizontal direction and extend upward from the upper surface side of the base member, respectively, and support the vicinity of the seat bone and the tailbone of the seated person,
It is provided so as to extend upward from the upper surface side of the base member, has an area three times or more in plan view with respect to each first air cell, and the dimension in the front-rear direction of the seating surface is the seating surface of each first air cell A second air cell that is formed larger than the dimension in the front-rear direction and that is disposed substantially at the center in the seating surface width direction and supports at least a part of the perineum of the seated person and the inner sides of both thighs. Cushion characterized by. In a cushion that is placed on a predetermined seating surface and supports a seated person,
A flat base member;
A plurality of first air cells that are provided so as to be arranged in a horizontal direction and extend upward from the upper surface side of the base member, respectively, and support the vicinity of the seat bone and the tailbone of the seated person,
It is provided so as to extend upward from the upper surface side of the base member, has an area three times or more in plan view with respect to each first air cell, and the dimension in the front-rear direction of the seating surface is the seating surface of each first air cell It is formed to be larger than the dimension in the front-rear direction, and is disposed substantially at the center in the seating surface width direction, a part is disposed in the front half of the seating surface front-rear direction, and the centroid in plan view is the base member And a second air cell arranged in the rear half of the seating surface in the front-rear direction. The cushion according to claim 1, wherein the second air cell is formed so as to be substantially symmetric in the seating surface width direction. The second air cell is formed so that the maximum dimension in the seating surface width direction of the rear half part of the seating surface longitudinal direction is 1.5 times or more than the maximum dimension in the seating surface width direction of the front half part of the seating surface longitudinal direction. The cushion according to claim 1, 2, or 3. The said 2nd air cell was formed so that a height dimension might become large gradually toward the front-end side from the center of the seating surface front-back direction, The any one of Claim 1, 2, 3 or 4 characterized by the above-mentioned. cushion. The cushion according to any one of claims 1, 2, 3, 4, or 5, wherein the second air cell is configured such that a rear end side in the front-rear direction of the seating surface is bifurcated in the seating surface width direction. . The cushion according to any one of claims 1, 2, 3, 4, 5 and 6, wherein the second air cell is disposed in a range other than a range supporting the ischium and the tailbone. Among each air cell of the cushion which has a flat base member and a plurality of air cells provided so as to extend upward from the upper surface side of the base member and is placed on a predetermined seating surface and supports a seated person, An air cell at the center in the width direction arranged at the approximate center in the seating surface width direction on the base member,
The air bag has an air bag formed so as to extend upward from the upper surface side of the base member, and the air bag has a seating surface longitudinal dimension of 100 mm or more, and a part of the air bag is a base member. An air cell, wherein the air cell is disposed in a first half portion in the front-rear direction of the seating surface, and a centroid in a plan view of the air bag is disposed in a second half portion in the front-rear direction of the seating surface of the base member. The air cell according to claim 8, wherein the air bag is formed so as to be substantially symmetrical in the seating surface width direction. The air bag is formed such that the maximum dimension in the seating surface width direction of the rear half part of the seating surface longitudinal direction is 1.5 times or more than the maximum dimension in the seating surface width direction of the front half part of the seating surface longitudinal direction. The air cell according to any one of claims 8 and 9, wherein The air cell according to any one of claims 8, 9 and 10, wherein the air bag is formed so that a maximum dimension in a seating surface width direction of a front half portion of a seating surface longitudinal direction is 40 mm or more and 70 mm or less. . The air cell according to any one of claims 8, 9, 10 and 11, wherein the air bag is formed such that a height dimension gradually increases from a center in the longitudinal direction of the seating surface toward a front end side. . The air cell according to any one of claims 8, 9, 10, 11 and 12, wherein the air bag is configured such that a rear end side in the front-rear direction of the seating surface is bifurcated in the seating surface width direction.