JP2006043342A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair which prevents pressure on an anus regardless of a seated position or the size of hips without giving an unnatural feeling to the eye. <P>SOLUTION: The chair 1 suitable for usage by a hemorrhoidal patient is constituted so that the seat part 10 where a user is seated is provided with a valley part U, including seat surfaces 11a, 11b to be upward inclined toward both sides in a width direction A, at the center of the width direction A in the seat part 10, thereby the pressure by the seat part 10 on the anus is reduced when the user is seated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a chair suitable for use by people with hemorrhoids.

  Conventionally, when a man with a hemorrhoid is seated on a commonly used chair, there is a problem that pain occurs in the anus of the man with a hemorrhoid. This is because the anus is pressed against the seat surface because the seat surface of the chair is substantially flat. Therefore, in order to solve this problem, Patent Document 1 discloses a chair for a sick person in which a central portion of the seat surface of the chair is cut out. This chair for hemorrhoids has a circular recess in the central part of the seat, and when used by hemorrhoids, the affected area is less likely to be pressed to relieve pain. .

Japanese Patent Laid-Open No. 08-187257

  However, in such a conventional technique, if the anus is seated in a state where the anus is displaced from the central recess or hollowed out portion of the seat, the anus is pressed against the seat and pain occurs, so the anus is recessed or The problem is that you have to sit carefully so that it sits on the hollowed out part, and that you must sit back carefully after sitting down so that the anus does not slip out of the recessed part or hollowed out part. There was.

  Also, these chairs are dedicated and difficult for ordinary people to sit on, and when they sit on them, other people know that they are sick and can be embarrassed. It was.

  The present invention has been made paying attention to the above-described problems of the prior art, and provides a chair that does not feel anus and does not feel uncomfortable regardless of the sitting position or the size of the buttocks. The purpose is to do.

The gist of the present invention for achieving the object lies in the inventions of the following items.
[1] A chair (1) suitable for use by people with hemorrhoids,
The seat (10) on which the user is seated is formed in a substantially V shape with a low central part,
The seat portion (10) is an intersection of the inclined seat surfaces (11a, 11b) on both sides inclined upward toward both sides in the width direction (A) and the lower positions of the inclined seat surfaces (11a, 11b) on both sides. A chair (1) comprising a valley (U) formed in a part (X) and having reduced pressure on an anus at a center position of a body at the time of sitting.

[2] A chair (1) suitable for use by people with hemorrhoids,
The seat (10) on which the user is seated is formed in a substantially V shape with a low central part,
The seat (10) is arranged in a substantially V shape with the receiving plate (14) inclined upward toward both sides in the width direction (A), and a cushion (11) is laid on the receiving plate (14). The inclined seating surfaces (11a, 11b) on both sides are formed, and the valley (U) is formed at the intersection (X) at the lower position of the inclined seating surfaces (11a, 11b) on both sides. A chair (1) characterized in that pressure on the anus in the center of the body is reduced.

[3] A chair (2, 3) that is suitable for use by people with hemorrhoids and that can be seated by multiple persons at the same time,
An inclined seating surface in which a seat (10) on which a user is seated is inclined upward in the center of the seat width direction (B) and toward both sides of the seat width direction (B) for each seat width of one person. (11a, 11b) and a substantially V-shape formed by a valley (U) formed between the inclined seating surfaces (11a, 11b), and the pressure on the anus at the center of the body when seated Bench-type chairs (2, 3) characterized by reduced.

  [4] The bench-type chair (3) according to [3], wherein an integral cushion (31) is laid on a seat portion (10) in which the substantially V shape is continuous.

[5] A chair (4) suitable for use by people with hemorrhoids in a bath,
The seat (40) on which the user is seated is formed in a substantially V shape with a low central part,
The seat portion (40) is an intersection between the inclined seat surfaces (41a, 41b) on both sides inclined upward toward both sides in the width direction (A) and the lower positions of the inclined seat surfaces (41a, 41b) on both sides. A chair (4) formed by forming a trough (U) in the part (X) and making it difficult to contact the anus located at the center of the body at the time of sitting and the inclined seating surfaces (41a, 41b). ).

  The present invention operates as follows.

  In the chair (1) of [1], the seat portion (10) is formed in a substantially V shape with the center portion in the width direction (A) being lowered, and the seat portion (10) is formed in the width direction (A ) On both sides of the inclined seating surfaces (11a, 11b) that are inclined upward toward both sides, and a valley (U) at the intersection (X) at a lower position of the inclined seating surfaces (11a, 11b) on both sides. Do it. For this reason, as long as the user sits in a normal manner, the anus does not hit the inclined seating surfaces (11a, 11b), and therefore the anus is not compressed. In addition, when the user sits on the chair (1), it is easy to sit unconsciously and sits in a position where the posture is stable, but because of the inclined seating surfaces (11a, 11b), it sits in a position where the posture is stable. Because the anus is located above the valley (U) regardless of the size of the user's buttocks, the anus can naturally sit in a position where it is not compressed.

  Moreover, since the said trough part (U) is formed in the front-back direction of the chair (1) in the center of the width direction (A) of the seat part (10), the seating position is shifted in the front-rear direction and the seating posture is changed. However, the anus is not squeezed, so it can sit comfortably for a long time. Further, since the shape of the seat (10) as a whole, that is, the two inclined seating surfaces (11a, 11b) having different shapes and the chair (1) as a whole is characteristic, the seat (10) Unlike the shape of what has a local characteristic, it becomes a chair (1) which does not feel strange in appearance.

  The seat portion (10) is arranged in a substantially V shape with the receiving plate (14) inclined upward toward both sides in the width direction (A), and the cushion (11) is laid on the receiving plate (14). In this case, the inclined seating surfaces (11a, 11b) on both sides are formed, and the valley (U) is formed at the intersection (X) at the lower position of the inclined seating surfaces (11a, 11b) on both sides. However, since the cushion (11) forms the inclined seating surfaces (11a, 11b), the anus does not hit the inclined seating surfaces (11a, 11b) as described above. Direct pressure on the anus can be reduced.

  [3] In the bench-type chair (2, 3), the seat portion (10) is located at the center of the seat width direction (B) for each seat width of approximately one person and on both sides of the seat width direction (B). A substantially V-shape consisting of a sloped seat surface (11a) inclined upward and a valley portion (U) formed between the sloped seat surface (11b) is made continuous, and each valley portion (U) One person can sit on top. Therefore, a plurality of people can be seated on the chair (2, 3) at the same time. Also in this case, since there is an inclined seating surface (11a, 11b), when the seated person sits naturally, the anus is located above the valley (U), so the pressure on the anus by the seat (10) is reduced. To do.

  In addition, the chair (2, 3) may be a straight, continuous V-shape formed in the seat (10) in the longitudinal direction of the chair (2, 3), or the chair (2, 3). The longitudinal direction of the arc may be continuous along the arc. By installing it in a waiting room of a hospital, a hotel lobby, etc., persons with hemorrhoids can feel free to chair (2, 3) in those places. Can sit on.

  In the bench-type chair (3) of [4], by laying the cushion (31) integral with the seat (10), the manufacturing time is shorter than when laying the cushion for each seat, The manufacturing cost can be reduced.

  In the chair (4) of [5], when the user is seated at a natural position, the anus is located above the valley (U) and does not contact the inclined seating surfaces (41a, 41b). . Moreover, the hot water which flowed down on the inclined seat surface (41a, 41b) flows toward the trough (U), and further flows down from both ends of the trough (U). For this reason, hot water does not remain on the inclined seat surfaces (41a, 41b) or the valleys (U). Thus, the chair (4) can be improved in hygiene as a chair used in a bathhouse.

  According to the chair of [1] according to the present invention, when the user is seated, the anus is located above the valley portion formed at the intersection of the low positions of the inclined seating surfaces on both sides. There is no touch and the anus does not receive pressure from the seat. Further, since the valley portion is formed in the front-rear direction of the chair at the central portion in the width direction of the seat portion, the anus is not compressed even if the seating position is shifted in the front-rear direction and the seating posture is changed. Therefore, there is no pressure on the anus regardless of the seating position, so that it is possible to sit comfortably even for a long time. Moreover, the shape of the chair has a characteristic in the shape of the whole chair which has two inclined seat surfaces from which an inclination direction differs, and it can be set as the chair which does not have a sense of incongruity in appearance unlike what has a local characteristic.

  According to the chair of [2], the seating comfort is improved by forming the inclined seating surfaces on both sides by the cushion, and as with the chair of [1], there is no pressure on the anus regardless of the sitting position, and , The chair will not feel strange.

  According to the bench-type chair of [3], one person can be seated on each valley, and even if multiple persons are seated on the chair at the same time, there is an inclined seating surface. As long as the person sits naturally, the anus is located above the valley, reducing the pressure on the anus by the seat.

  In addition, since the inclined seating surfaces with different inclination directions continue alternately in the width direction of the seat portion, the shape feature of this chaise longue appears as one design feature of the entire chaise longue, so that it can be used for people with epilepsy The chair does not look like a chair, and it does not look strange.

  According to those equipped with a plurality of seats with valleys, especially by installing in waiting rooms such as surgery and obstetrics for patients with hemorrhoids, patients with hemorrhoids are comfortable without worrying about the occurrence of pain due to sitting. You can sit on a chair.

  Furthermore, like the bench-type chair of [4], by laying an integral cushion on the seat, it is possible to improve the sitting comfort while reducing the pressure on the anus by the seat, Compared with the case where cushions are laid for each seat, the manufacturing time is shortened and the manufacturing cost can be reduced.

  In addition, when the chair is a chair used in a bathhouse, when sitting, the anus does not adhere to the inclined seating surface that is the seating surface, and hot water does not flow down and collect from the front and back of the valley. Infections such as AIDS and Candida can be prevented. In particular, since it is easier to retain water than a resin chair, it is effective in preventing infection and improving hygiene in a wooden chair that may be inferior in hygiene.

Hereinafter, various preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a chair according to a first embodiment of the present invention.
As shown in FIG. 1, the chair 1 includes a leg portion 12 provided on both sides of the chair 1, a bottom plate 13 and a receiving plate 14 provided between the leg portions 12 to which the seat portion 10 is attached, and a backrest 15. It is composed of The legs 12 and the bottom plate 13 may be made of wood or steel, and may be any material generally used for a chair. The backrest 15 is made of wood, steel, cloth or the like, and the material is not particularly limited.

  The bottom plate 13 is fixed substantially horizontally between the left and right legs 12. On the bottom plate 13, a receiving plate 14 that is inclined upward from the central portion of the bottom plate 13 to the leg portions 12 on both the left and right sides is fixed. The left and right receiving plates 14 are arranged in a shape in which a V-shape is widened to the left and right when viewed from the front. The receiving plate 14 is not particularly limited as long as the receiving plate 14 is made of wood, steel, resin, or other material that can be sufficiently supported when the user is seated on the seat 10.

  A seat 10 on which a user sits is provided on the receiving plate 14. The seat portion 10 is formed by laying cushions 11 on the respective receiving plates 14. The cushion 11 is formed by attaching a cover to urethane having substantially the same thickness, for example. The upper surface of the cushion 11 forms substantially planar inclined seat surfaces 11a and 11b. These inclined seat surfaces 11a and 11b are inclined upward from the central portion in the width direction A of the seat portion 10 toward both sides of the width direction A. It has a shape that is spread out. The intersection portion X at the lower position of the inclined seating surfaces 11a and 11b on both sides forms a valley U. Therefore, the valley portion U extends in the front-rear direction of the seat portion 10.

  In addition, the inclined seat surfaces 11a and 11b do not need to reach the lowest bottom of the valley U, and may be only halfway from the top of the receiving plate 14 to the bottom. Further, the inclined seat surfaces 11 a and 11 b do not necessarily have to reach the uppermost part of the receiving plate 14.

  The cushions 11 may be individually arranged on the respective receiving plates 14, but one flat cushion is folded and laid in a shape in which the V-shape is widened to the left and right. Alternatively, it may be arranged in advance that the V-shape is preliminarily formed in a shape that is widened to the left and right.

Next, the operation of the chair 1 according to the first embodiment will be described.
The center in the width direction A of the seat portion 10 is the intersection X of the inclined seating surfaces 11a and 11b on both sides, is the lowest position of the seat portion 10, and is the bottom of the valley portion U. For this reason, when the user sits on the chair 1 in a normal way of sitting, the anus does not hit the inclined seating surfaces 11a and 11b, and therefore the anus is not compressed.

  Usually, when a user sits on the chair 1, it is easy to sit unconsciously and sits so that the posture is stable, but as shown in FIG. 2, the seat 10 has inclined seating surfaces 11a and 11b, If the position of the anus sits at a position deviated from the position directly above the bottom of the valley U, the anus sits on one of the inclined seating surfaces 11a and 11b. As long as the anus is located above the valley U even if it sits away, the anus will not be squeezed from the seat 10, but the user will feel that the side is tilted and feel uncomfortable It will naturally sit back in a position that does not feel tilt. Since the anus is located almost directly above the bottom of the valley U at the position where the inclination is not felt, the anus is not subjected to any pressure from the seat portion 10.

  When the anus is pressed from either of the inclined seat surfaces 11a and 11b when sitting on the chair 1, it is when sitting on either one of the inclined seat surfaces 11a and 11b, but the inclined seat surface 11a. , 11b are inclined, so when sitting in this way, sitting on either side is less comfortable than when sitting side by side as described above, and it is extremely difficult to sit down. Therefore, unless the person dares to sit down like this, the inclined seating surfaces 11a and 11b do not press the anus, and the person with hemorrhoids can easily sit on the chair 1.

  Further, since the valley portion U including the inclined seat surfaces 11a and 11b extends in the front-rear direction of the seat portion 10, the anus is not compressed even if the seating position is shifted in the front-rear direction and the seating posture is changed. For this reason, even if it is a long time, it can sit down comfortably, changing a seating position and a seating posture suitably.

  In addition, even when a user who is not a person with a hemorrhoid is using it, the inclined seating surfaces 11a and 11b support the user's buttocks, so that the buttocks fit well when seated and a comfortable seating feeling is provided.

  In addition, since the seating surfaces are inclined seat surfaces 11a and 11b as described above, the user can sit down so that the anus is positioned directly above the valley U. Since it does not matter whether it is large or small and the size of the buttocks, a user of a body size who can sit on the chair according to the present embodiment can obtain a comfortable sitting comfort.

  The shape of the chair 1 is different from the shape of a general chair in the overall shape of the seat portion 10 having two inclined seating surfaces 11a and 11b having different inclination directions. The overall shape of the seat 10 demonstrates the effect of eliminating pressure on the anus, but the design of the chair is considered as a design characteristic of the seat 10 and is intended for use by people with hemorrhoids. It is hard to understand that there is, and it becomes a chair that doesn't feel strange.

  In addition, the inclination degree of the illustrated inclined seat surfaces 11a and 11b is merely an example, and does not limit the inclination angle. For example, when installing in a waiting room for surgery or obstetrics where there are many people with hemorrhoids, the tilt angle should be relatively large, and for office chairs and car chairs used by general office workers, the tilt angle should be relatively small. It is preferable to do.

  Said chair 1 may be equipped with the mechanism which can adjust the inclination-angle of inclination seat surface 11a, 11b, and can obtain the seating feeling suitable for a user's liking by this.

  In addition, when a saddle man drives a car, he may twist his body and sit on the seat. This is a way of sitting to relieve severe pain because the anus is pressed more strongly when the brakes are stepped on, but sitting with twisting while driving also causes severe pain when braking However, it is dangerous because both can lead to an accident, but by mounting the chair according to the present embodiment on the car, the severe pain at the time of braking is reduced, and it is not necessary to twist and sit while driving. So it leads to the improvement of safety while driving for those who are sick. Thus, by providing the chair equipped in the automobile with a mechanism capable of adjusting the inclination angle of the inclined seat surfaces 11a and 11b, the inclination angle of the inclined seat surfaces 11a and 11b can be adjusted to the angle required by each driver. It will be a more comfortable and safe chair for those who are sick.

Next, a bench-type chair according to a second embodiment of the present invention will be described with reference to FIG.
FIG. 3 schematically shows a chair 2 according to a second embodiment of the present invention.
The difference between the chair 2 according to the present embodiment and the chair 1 according to the first embodiment is that a plurality of seat portions 10 similar to the seat portion 10 of the chair 1 according to the first embodiment are provided side by side. It is. This is because the seat portion 10 is inclined in the center in the seat width direction B for each seat width for approximately one person, and between the inclined seat surface 11b and the inclined seat surface 11b inclined upward toward both sides of the seat width direction B. A substantially V-shape formed by the valley portion U formed in FIG. In addition, the same code | symbol is attached | subjected to the site | part of the same kind as 1st Embodiment, and the overlapping description is abbreviate | omitted.

In this embodiment, since the seats 10 for five seats are arranged side by side, the bottom plate 13 becomes longer in the width direction, and the load increases as the number of seated persons increases. Is used. Although not shown, a reinforcing material for receiving a load is used. Further, a support member 16 that fixes and supports the receiving plate 14 is provided below the two adjacent seats 10 and 10.
In the chair 2 illustrated in FIG. 3, an armrest 17 is provided between the adjacent seat portions 10. Thereby, the chair 2 has a more excellent function as a chair.

Next, the operation of the bench-type chair 2 according to the second embodiment will be described.
The seat 10 in the chair 2 according to the present embodiment is basically the same as the seat 10 in the first embodiment. When sitting so as to be comfortable, the anus is naturally positioned almost directly above the valley U as described in the above embodiment. As a result, the seat 10 does not press the anus, and a person with hemorrhoids can sit comfortably.

  By installing multiple seats 10 side by side or side by side in an arc, and installing them in waiting rooms such as hospitals or hotel lobbies, people with hemorrhoids can take care of them Can sit on a chair.

  Moreover, the user who is not a hemorrhoid can obtain a comfortable seating comfort similarly to the chair according to the first embodiment.

  A plurality of the seat portions 10 are provided adjacent to each other, but a space for placing an accessory between the adjacent seat portions 10 instead of the arm rest 17 or together with the arm rest 17 as described above. An accessory storage may be provided.

  Further, the armrest 17 and the accessory storage need not be provided.

  Next, a bench-type chair according to a third embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the site | part of the same kind as 2nd Embodiment, and the overlapping description is abbreviate | omitted.

  The figure which looked at the bench-type chair 3 concerning 3rd Embodiment of this invention from the front is shown by FIG. The chair 3 can be seated by a plurality of persons at the same time, and is similar to the chair 2 according to the second embodiment, but the chair 2 according to the second embodiment is provided for each of the inclined seating surfaces 11 a and 11 b of the seat portion 10. The chair 3 according to the present embodiment is different in that the cushion 11 is laid on the seat portion 10 and the integral cushion 31 is laid on the entire seat portion 10.

  In the chair 3, a bottom plate 13 for mounting the seat portion 10 is attached between the leg portions 12 provided on both sides. On the bottom plate 13, there is provided a support member 16 for fixing and supporting the receiving plate 14 for each seat width for approximately one person. The receiving plate 14 is attached from the center between the support members 16 toward the upper portions of the support members 16 on both sides (upward toward both sides in the seat width direction B). Therefore, as shown in the drawing, the receiving plate 14 is attached so as to be continued in a substantially V shape with the inclination direction alternately changed in the longitudinal direction of the chair 3.

  An integral cushion 31 is laid on the seat 10 extending in the longitudinal direction of the chair 3 on the receiving plate 14 attached in this way. As a result, the seat portion 10 is positioned at a low position on the inclined seat surfaces 31a and 31b inclined upward in the center in the seat width direction B, that is, toward both sides of the seat width direction B, for each seat width of approximately one person. A valley U is formed at the intersection site X.

  According to the chair 3, the anus is not compressed from the seat portion 10 when the user sits on one valley portion U, similarly to the chairs according to the above-described embodiments. For this reason, a person with hemorrhoids can sit on the chair 3 comfortably without fear of pain due to sitting.

  The inclined seat surfaces 31a and 31b of the seat portion 10 may be continuous as illustrated. For example, a flat surface portion having a predetermined width is provided between the inclined seat surface 31b and the inclined seat surface 31a of the adjacent seat. It may be provided.

Next, a chair according to a fourth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the site | part of the same kind as 1st Embodiment, and the overlapping description is abbreviate | omitted.
The figure which looked at the chair concerning 4th Embodiment of this invention from the front is shown by FIG.

  The chair 4 according to the present embodiment is a chair used in a bathhouse. The chair 4 has a leg portion 42 directly fixed to a seat portion 40 on which a user sits. Both the seat 40 and the legs 42 are made of wood. However, it is not limited to wooden and may be made of resin.

  The seat 40 has flat surfaces inclined upward from the center in the width direction A toward both sides of the width direction A as the inclined seat surfaces 41a and 41b. The intersection portion X at a lower position of the inclined seating surfaces 41a and 41b forms a valley U, and is formed in a shape in which the V shape is widened to the left and right.

  Also in the chair 4 according to the present embodiment, the user's anus is positioned directly above the valley U when the user sits in an easy-to-sit manner as in the above-described embodiments. , 41b does not compress the anus. Further, the anus does not adhere to the inclined seat surfaces 41a and 41b, and hot water also flows down the inclined seat surfaces 41a and 41b toward the bottom of the valley portion U and flows down from the front and rear ends of the bottom portion to the valley portion U. Since it does not accumulate, infections such as AIDS and Candida can be prevented. In particular, wooden chairs are likely to be inferior in hygiene because they are easier to retain water than resin chairs, but hot water is less likely to stay on the inclined seating surfaces 41a and 41b, which is effective in preventing infection and improving hygiene. .

  In each of the above embodiments, the inclined seating surface may be substantially flat as described above, and is not limited to a flat surface. For example, a curved surface such as a partial shape of a cylindrical side surface or a partial shape of a spherical surface. But you can.

  In addition, according to each of the embodiments described above, a space is created between the anus and the seat, and the anus is not directly compressed by the seat, so that the chances of pain are drastically reduced and the hemorrhoid is easily cured.

It is a front view which shows the chair concerning 1st Embodiment of this invention. It is a schematic diagram which shows the use condition of the chair concerning 1st Embodiment of this invention. It is a schematic diagram of the chair concerning 2nd Embodiment of this invention. It is a front view which shows the chair concerning 3rd Embodiment of this invention. It is a front view of the chair concerning a 4th embodiment of the present invention.

Explanation of symbols

1, 2, 3, 4 ... Chair 10 ... Seat 11 ... Cushion 11a, 11b ... Inclined seat 12 ... Leg 13 ... Bottom plate 14 ... Base plate 15 ... Backrest 16 ... Support member 17 ... Armrest 31 ... Cushion 31a, 31b ... Inclined seat surface 40 ... Seat part 41a, 41b ... Inclined seat surface 42 ... Leg part A ... Width direction B ... Seat width direction U ... Valley part X ... Intersection part

Claims (5)

A chair suitable for the use of a sick person,
The seat where the user is seated is formed in a substantially V-shape with a low center,
The seat portion is formed by forming a valley portion at the intersection of the inclined seat surfaces on both sides inclined upward toward both sides in the width direction and the lower positions of the inclined seat surfaces on both sides, and the center of the body at the time of sitting A chair characterized by reduced pressure on the anus in position. A chair suitable for the use of a sick person,
The seat where the user is seated is formed in a substantially V-shape with a low center,
The seat portion is arranged in a substantially V shape by tilting the receiving plate upward toward both sides in the width direction, and cushions are laid on the receiving plate to form inclined seating surfaces on both sides, A chair characterized in that a valley is formed at the intersection of the lower position of the seating surface, and the pressure on the anus at the center position of the body at the time of sitting is reduced. 椅子 A chair that is suitable for use by people with illnesses and can be seated by multiple people at the same time.
A seat on which a user is seated is formed at the center in the seat width direction for each seat width of approximately one person, between the inclined seat surface and the inclined seat surface that is inclined upward toward both sides in the seat width direction. A bench-type chair characterized by a continuous substantially V-shape with a valley and reducing pressure on the anus at the center of the body when seated.   The bench-type chair according to claim 3, wherein an integral cushion is laid on a seat portion in which the substantially V shape is continuous. A chair suitable for use by people with hemorrhoids in the bath,
The seat where the user is seated is formed in a substantially V-shape with a low center,
The seat portion is formed by forming a valley portion at the intersection of the inclined seat surfaces on both sides inclined upward toward both sides in the width direction and the lower positions of the inclined seat surfaces on both sides, and the center of the body at the time of sitting A chair characterized in that it is difficult to make contact between the anus in the position and the inclined seating surface.

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