JP7509426B2 - Chair - Google Patents

Description

The present invention relates to a chair.

Traditionally, in Japanese-style rooms at hotels and other establishments, chairs with low seats, such as those disclosed in Patent Document 1, have been used to blend in seamlessly with the surrounding scenery and allow occupants to sit comfortably and relax.

Japanese Utility Model Publication No. 63-20376

Chairs with low seats such as that disclosed in Patent Document 1 are generally designed so that the seat is lower than the length of the user's lower legs. Therefore, when a user sits with their knees bent so that the soles of their feet touch the floor, their knees end up in a high position, similar to sitting with their knees in a cross-legged position, blocking their view forward. In particular, women who are wearing skirts or yukata robes cannot sit in a position where their knees are high.

For example, in order to avoid a posture in which the knees are high, women may sit with their knees bent so that both lower legs are aligned and extend backward from the sides (a posture similar to sitting sideways), or they may sit with their knees bent so that both lower legs extend backward from both sides (a posture similar to split sitting). However, in order to sit sideways or in a split sitting position, the front legs of the chair get in the way and the lower legs cannot be inserted below the seat, so it is necessary to sit in front of the seat. Men may sit with their knees bent so that both lower legs extend backward from the opposite sides (a posture similar to sitting cross-legged), but in this case too, the front legs get in the way and the lower legs cannot be inserted below the seat, so it is necessary to sit in front of the seat. By sitting in the front of the seat, the user is in an unstable position on the seat and is unable to relax.

The present invention was developed in consideration of the above problems, and aims to provide a chair that allows the user to sit by inserting their lower legs under the seat.

The chair of the present invention is a chair that is placed on a floor surface and used, and includes a seat on which a user sits, legs connected to the seat, a support base connected to the legs and placed on the floor surface, and a backrest connected to the seat, the seat is positioned so that the height from the floor surface to the seat surface of the seat is lower than the height from the soles of the feet to the knees of the user, the support base is positioned so that the rear end of the support base is located behind the rear end of the seat, the legs and the support base are not present between the seat and the floor surface below the tip region on the front side of the seat and below the lateral region behind the tip region on the front side of the seat, a space is formed into which at least a part of the user's lower leg can be inserted, and the backrest is curved in an approximately arc shape so as to be convex toward the rear.

It is also preferable that the chair further has a pair of armrests formed continuously from both horizontal ends of the backrest to the backrest, and that the pair of armrests are arranged so that they move away from the seat in the horizontal direction as they move away from the backrest.

It is also preferable that the leg portion includes a rear leg portion that extends continuously from the support base to the backrest portion, and that the rear leg portion is inclined backward as it moves from the support base to the backrest portion.

It is also preferable that the thickness of the seat in the vertical direction is 50 mm or less.

It is also preferable that the leg portion includes a front leg portion that supports the front side of the seat portion, and that the horizontal cross section of the front leg portion is formed to extend in the front-rear direction.

It is also preferable that the height from the floor surface to the seat surface of the seat is 150 mm or more and 350 mm or less.

The present invention provides a chair that allows the user to sit by inserting their lower legs under the seat.

1 is a perspective view of a chair according to an embodiment of the present invention; FIG. 2 is a front view of the chair of FIG. 1; FIG. 2 is a rear view of the chair of FIG. 1. FIG. 2 is a side view of the chair of FIG. 1; FIG. 2 is a plan view of the chair of FIG. 1; FIG. 2 is a bottom view of the chair of FIG. 1. 3 is a cross-sectional view taken along line AA in FIG. 2. 3 is a cross-sectional view taken along line BB in FIG. 2. 3 is a cross-sectional view taken along line CC of FIG. 2. 3 is a cross-sectional view taken along line D-D in FIG. 2. FIG. 2 is a perspective view showing the chair of FIG. 1 in use;

Below, a chair according to one embodiment of the present invention will be described with reference to the attached drawings. However, the following embodiment is merely an example, and the chair of the present invention is not limited to the following embodiment.

As shown in FIG. 11, the chair 1 according to one embodiment of the present invention is placed on a floor surface F and used for a user U to sit on. The floor surface F on which the chair 1 is placed is not particularly limited as long as it is a surface on which the chair 1 can be placed for use by the user U, and examples include surfaces such as tatami mats, carpets, wooden flooring, and tiles. In this specification, the terms "upper" and "lower" are used to mean "upper" and "lower" in the vertical direction, and the terms "front" and "rear" are used to mean "front" and "rear" as seen from the user U who is seated in a normal position on the chair 1, without any particular limitation. In this specification, the direction connecting the front and rear of the chair 1 is defined as the "front-rear direction", the direction perpendicular to the front-rear direction along the floor surface F is defined as the "width direction", and the direction connecting the top and bottom of the chair 1 is defined as the "upper-rear direction". In this specification, the term "horizontal direction" is used to mean any direction included in a horizontal plane.

As shown in Figs. 1 and 11, chair 1 comprises a seat 2 on which a user U sits, legs 3 connected to seat 2, a support base 4 connected to legs 3 and placed on a floor surface F, and a backrest 5 connected to seat 2. Chair 1 is placed on floor surface F when in use, with support base 4 positioned in contact with floor surface F.

The seat 2 is a portion on which the user U sits with his/her buttocks. As shown in Figs. 1 to 5, the seat 2 has a seat surface 2a on which the user U sits with his/her buttocks on the upper surface, and the legs 3 are connected to the lower surface. In this embodiment, the legs 3 are connected to the seat 2 via a connecting member 7, but the legs 3 may be connected directly without the connecting member 7. The seat 2 is positioned at a predetermined height from the floor F by being connected to a support base 4 placed on the floor F via the legs 3. The seat 2 is positioned so that the height H from the floor F to the seat surface 2a of the seat 2 is lower than the height from the sole of the user U (for example, a standard adult) to below the knee (for example, the position of the tibial tuberosity). This allows the user U to sit on the chair 1 calmly with his/her eyes close to the floor F. In particular, even when sitting facing a low desk or table, such as 50 cm high, the legs can be inserted under the desk or table with the knees bent at an angle greater than a right angle as shown in FIG. 11, so that the chair 1 can be moved closer to the desk or table and the user can sit in a position that allows them to work on the desk or table. The height H from the floor surface F to the seat surface 2a of the seat 2 is not particularly limited as long as it is at least lower than the height from the sole of the user U's foot to the knees, but from the viewpoint of the user U sitting calmly with his/her eyes close to the floor surface F, it is preferable that the height H from the floor surface F to the seat surface 2a of the seat 2 is 350 mm or less, more preferably 320 mm or less, and even more preferably 290 mm or less. In addition, from the viewpoint of the user U being able to easily sit on the seat 2 and easily stand up from the seat 2, it is preferable that the height H from the floor surface F to the seat surface 2a of the seat 2 is 150 mm or more, more preferably 180 mm or more, and even more preferably 220 mm or more.

In this embodiment, the seat 2 is formed in a substantially circular plate shape as shown in FIG. 1. By forming the seat 2 in a substantially circular plate shape, when the user U rotates his/her body in a horizontal plane along the seat surface 2a while in a seated position, the horizontal distance from the center of the body to the edge of the seat 2 is substantially constant regardless of the rotation position, so the user can stand up in the same way. For example, if the user sits on a low desk or table with the chair 1 close to him/her and stands up from there, the desk or table in front of him/her becomes an obstacle, making it difficult to stand up from the chair 1 toward the front. In such a case, the user U needs to change the direction of his/her body relative to the desk or table by rotating his/her body in a horizontal plane while in a seated position, and stand up while avoiding the desk or table. In this embodiment, the seat 2 is formed in a substantially circular shape, so when the direction of the body is rotated from the front-back direction Y of the seat 2, the horizontal distance from the center of the body in the direction in which the body is facing to the edge of the seat 2 does not change regardless of the direction in the horizontal plane in which the body is facing, so the user can stand up in the same way as standing up facing forward from the chair 1. However, as long as the user U can place his/her buttocks on the seat 2, there is no particular limitation on its shape, and it may be formed into other shapes, such as a roughly rectangular or roughly oval shape.

1, 4 and 6, the seat 2 is arranged so that the front end of the seat 2 is located forward of the front end of the support base 4 in the front-rear direction Y. As a result, the legs 3 and the support base 4 are not present between the seat 2 and the floor surface F below the tip region 2b on the front side of the seat 2 and below the lateral region 2c behind the tip region 2b on the front side of the seat 2, and a space S into which at least a part of the lower leg of the user U can be inserted is formed. As shown in FIG. 11, the user U can insert his/her lower leg into this space S and sit on the chair 1, so that the user U can sit in the appropriate position of the seat 2 and relax comfortably while sitting. In particular, the space S is formed below the tip region 2b and the lateral region 2c of the seat 2, so that the user U can bend his/her knees at an angle greater than a right angle when sitting and insert his/her lower leg diagonally backward from the front of the seat 2. Therefore, the user U can sit on the chair 1 in a posture such as sitting sideways, splitting the legs, or sitting cross-legged.

As shown in Figs. 1 and 4, the space S is defined as the space between the seat 2 and the projection surface on the floor surface F when the seat 2 is projected vertically downward, in which the legs 3 and the support base 4 are not present. By forming the space S between the seat 2 and the floor surface F in this way, the vertical length of the space S can be increased by the amount of the legs 3 and the support base 4, even if the height H of the seat surface 2a of the seat 2 from the floor surface F is the same, compared to when the space is formed between the seat 2 and the legs 3 or the support base 4. This makes it possible to form a space S having a height that allows at least a part of the lower leg of the user U to be inserted, while lowering the height of the seat 2.

In this embodiment, as shown in Figures 1 and 4, the space S is formed between the tip region 2b and the side region 2c of the seat 2 and the projection surface on the floor surface F when the tip region 2b and the side region 2c are projected vertically downward (the region shown by the dotted line on the floor surface F in Figure 1). As can be seen clearly in Figures 5 and 6, the tip region 2b of the seat 2 is the full-width region of the seat 2 located forward in the front-rear direction Y from the front end of the support base 4. The side region 2c of the seat 2 is located to the side in the width direction X in the region rearward of the tip region 2b, and is located outside the outer edge of the support base 4 in the width direction X. The shape of the space S in the horizontal plane is determined according to the shape of the tip region 2b and the side region 2c of the seat 2 in the horizontal plane, and the shape of the tip region 2b and the side region 2c of the seat 2 in the horizontal plane is determined according to the shape of the seat 2 and the support base 4 in the horizontal plane and the relative positions of the seat 2 and the support base 4. The size of the space S is determined by the size of the tip region 2b and the side region 2c of the seat 2 in the horizontal plane and the height from the floor surface F to the tip region 2b and the side region 2c of the seat 2. In this embodiment, the space S is formed only below the tip region 2b and the side region 2c of the seat 2. However, the space S only needs to be formed below at least the tip region 2b and the side region 2c of the seat 2, and may be formed below other regions of the seat 2 other than the tip region 2b and the side region 2c.

The space S is formed below the tip region 2b and the side region 2c of the seat 2, and as long as at least a part of the lower leg of the user U can be inserted, its shape and size are not particularly limited. The shape and size of the seat 2 in the horizontal plane, which is one of the elements that determine the shape and size of the space S, are also not particularly limited. For example, the shape of the seat 2 in the horizontal plane is approximately circular in this embodiment, and the shape of the space S in the horizontal plane is therefore approximately crescent-shaped. This makes it easier for the user U to bend his knees from the side to the rear and insert his lower leg into the space S. However, as described above, the shape of the seat 2 in the horizontal plane is not limited to approximately circular, and may be other shapes such as approximately rectangular or approximately elliptical. In addition, the size of the seat 2 in the horizontal plane is not particularly limited as long as it has the tip region 2b and the side region 2c to form the space S in which at least a part of the lower leg of the user U can be inserted, and is large enough for the user U to place his buttocks, and can be set appropriately according to the size of the user U's body.

The seat 2 may have a thickness that is strong enough to support the user U when the user U is seated, and is not particularly limited, but the thickness in the vertical direction Z of the seat 2 is preferably 50 mm or less. By having the thickness in the vertical direction Z of the seat 2 be 50 mm or less, the height H from the floor surface F to the seat surface 2a of the seat 2 can be reduced while ensuring the height of the space S for inserting the lower leg of the user U. From this viewpoint, the thickness in the vertical direction Z of the seat 2 is more preferably 40 mm or less, and even more preferably 30 mm or less. In addition, the material of the seat 2 is not particularly limited as long as it has the strength to support the user U when the user U is seated, and it can be formed from any material such as wood, resin, or metal. The buttocks of the user U may be placed directly on the seat surface 2a of the seat 2, or the buttocks of the user U may be placed indirectly via a cushion C laid on the seat surface 2a as shown in FIG. 11.

The legs 3 are parts that position the seat 2 at a predetermined height and support the seat 2 at the predetermined height. The legs 3 support the seat 2 and, via the seat 2, support the user U seated on the seat 2. In this embodiment, the legs 3 position the backrest 5 at a predetermined height (for example, the height near the waist and/or back when the user U sits on the seat 2) and support the backrest 5 at the predetermined height. The configuration of the legs 3 is not particularly limited as long as it can support the seat 2 and the backrest 5. In this embodiment, the legs 3 include a pair of front legs 31, 31 located on the front side of the chair 1 and a pair of rear legs 32, 32 located on the rear side of the chair 1, as shown in Figures 1 to 4.

The front leg 31 supports the front side of the seat 2. As shown in Figs. 1 to 4, the front leg 31 is formed to extend in the vertical direction Z, with its lower end fixed to the support base 4 and its upper end fixed to the seat 2 via a side connection member 71. The upper end of the front leg 31 may be fixed directly to the seat 2 without the side connection member 71. The method of fixing the front leg 31 is not particularly limited as long as the fixing part is fixed to a degree that does not break when a load is applied, such as when the user U sits on the seat 2. The lower end of the front leg 31 is fixed to the upper surface of the support base 4 by a fixing tool WS (see Fig. 6) such as a wood screw, and the upper end of the front leg 31 is fixed by fitting to the side connection member 71 fixed to the lower surface of the seat 2 by a fixing tool WS (see Fig. 6) such as a wood screw.

The front leg 31 is not particularly limited in shape as long as it can support the seat 2 and the user U when the user U is seated on the seat 2. In this embodiment, the front leg 31 is formed so that the horizontal cross section of the front leg 31 extends in the front-rear direction Y, as shown in Figs. 1 to 4 and 10. The front leg 31 has a cross section extending in the front-rear direction Y, which increases the rigidity against the rotation moment around an axis extending in the width direction X. Therefore, even if a large load is applied to the front side of the seat 2, the chair 1 can be prevented from tilting forward. In this embodiment, the chair 1 is easily tilted forward because a space S is formed below the front side of the seat 2, but the cross section of the front leg 31 extends in the front-rear direction Y, which prevents the chair 1 from tilting forward.

In this embodiment, the front leg 31 extends in the vertical direction Z, but as long as it can support the front side of the seat 2, this is not limited to this embodiment and it may extend at an angle from the vertical direction Z. In addition, as long as the front leg 31 has the strength to support the seat 2 and the user U when the user U is seated on the seat 2, there is no particular limitation on the material, and it can be made of any material such as wood, resin, or metal.

The rear leg 32 supports the rear side of the seat 2 and also supports the backrest 5. As shown in Figs. 1 to 4, the rear leg 32 is formed to extend continuously from the support base 4 to the backrest 5 without any other member, and its lower end is fixed to the support base 4 and its upper end is fixed to the backrest 5. The rear leg 32 is fixed to the seat 2 via a rear connection member 72 at an intermediate portion between its upper end and lower end. The intermediate portion of the rear leg 32 may be fixed directly to the seat 2 without the rear connection member 72. The fixing method of the rear leg 32 is not particularly limited as long as the fixing portion is fixed to a degree that does not break when a load is applied, such as when the user U sits on the seat 2. The lower end of the rear leg 32 is fixed to the upper surface of the support base 4 by a fastener WS (see FIG. 6) such as a wood screw, and the upper end of the rear leg 32 is fixed by fitting to the backrest 5. The middle part of the rear leg 32 is fixed by fitting to a rear connection member 72 that is fixed to the lower surface of the seat 2 by a fastener WS (see FIG. 6) such as a wood screw.

The rear leg 32 may extend from the support base 4 to the backrest 5, and is not particularly limited, but in this embodiment, as shown in FIG. 4, it is inclined backward from the support base 4 to the backrest 5. For example, as described in detail below, when a user U stands up with his/her hands on the armrests 6, 6 described below, a downward pressure is applied to the armrests 6, 6, but since the rear leg 32 is inclined backward, some of the pressure can be released backward. As described above, the chair 1 of this embodiment is easily tilted forward because a space S is formed below the front side of the seat 2, but by releasing some of the downward pressure applied to the armrests 6, 6 backward, the forward tilt is suppressed.

The rear leg portion 32 is not particularly limited in material, and can be made of any material such as wood, resin, metal, etc., as long as it can support the seat portion 2 and the user U when the user U is seated on the seat portion 2, and can also support the load applied by the user U to the backrest portion 5.

The support base 4 is placed on the floor surface F, and the lower end of the leg 3 is fixed to its upper surface to support the leg 3. The support base 4 supports the leg 3, and supports the seat 2, the backrest 5, and the user U seated on the seat 2 via the leg 3. As shown in Figs. 1, 4, and 6, the support base 4 is arranged so that the front end of the support base 4 is located rearward in the front-rear direction Y from the front end of the seat 2. As a result, as described above, a space S is formed below the front side of the seat 2 into which at least a part of the lower leg of the user U can be inserted. In addition, the support base 4 is arranged so that the rear end of the support base 4 is located rearward in the front-rear direction Y from the rear end of the seat 2. As a result, the chair 1 is prevented from tilting backward. For example, as described later, even if a backward pressing force is applied to the backrest 5, the rear end of the support base 4 is located rearward from the rear end of the seat 2, thereby preventing the chair 1 from tilting backward. As described above, even if part of the downward pressure applied to the armrests 6, 6 is deflected backward by the rear leg 32 tilted backward, the rear end of the support base 4 is positioned rearward of the rear end of the seat 2, thereby preventing the chair 1 from tilting backward. In order to position the front end of the support base 4 rearward of the front end of the seat 2 and the rear end of the support base 4 rearward of the rear end of the seat 2, in this embodiment, the center of the support base 4 in the horizontal plane is positioned rearward of the center of the horizontal plane of the seat 2 in the front-rear direction Y, as shown in Figures 4 and 6.

The shape of the support base 4 is not particularly limited as long as the front end of the support base 4 is located behind the front end of the seat 2, the rear end of the support base 4 is located behind the rear end of the seat 2, and the support base 4 is formed to have the strength to support the legs 3 and the like. For example, it is preferable that the support base 4 is formed in a plate shape, and the entire surface of the lower surface that contacts the floor surface F is formed to be approximately flat. As a result, when the support base 4 is placed on the floor surface F, the entire surface of the lower surface of the support base 4 comes into surface contact with the floor surface F. Therefore, even if the user U sits on the chair 1 placed on the floor surface F, the force pressing the floor surface F due to the load of the chair 1 and the weight of the user U is distributed over approximately the entire surface of the lower surface of the support base 4, so that the deformation of the floor surface F (for example, the tatami mat is dented) is suppressed. In addition, even if the chair 1 is slid on the floor surface F via the support base 4 in an attempt to move the chair 1, the force applied to the floor surface F is distributed over approximately the entire surface of the lower surface of the support base 4, so that the floor surface F is prevented from being damaged. However, the support base 4 does not necessarily have to be plate-shaped as long as it can support the legs 3 and support the seat 2 and the user U via the legs 3. For example, the support base 4 may have a structure in which only a portion of the lower surface is formed substantially flat and the upper surface has projections and recesses.

In this embodiment, the support base 4 is formed in a substantially annular plate shape as shown in Figs. 1 and 6. The support base 4 has a substantially circular outer periphery, which softens the sensation of contact, for example, when the heel comes into contact with the support base 4 when the lower leg is inserted into the space S below the seat 2. In addition, the support base 4 is formed in a ring shape, which reduces its weight. However, the support base 4 is not limited to the example shown in the figures, and may be formed in a solid substantially circular plate shape, or in another shape such as a substantially rectangular or elliptical plate shape.

The size of the support base 4 in the horizontal plane is not particularly limited as long as a space S is formed below the seat 2 and the support base 4 protrudes rearward from the seat 2, but as shown in FIG. 6, it is preferable that the size of the space S in the horizontal plane is smaller than the size of the seat 2 in the horizontal plane. This makes it possible to increase the size of the space S in the horizontal plane, and in particular to increase the size of the side region 2c of the seat 2 in the horizontal plane. Therefore, the user U can bend his/her knees with his/her lower legs closer to the center of the chair 1, allowing him/her to sit more comfortably on the chair 1.

As long as the support base 4 has the strength to support the legs 3 and, via the legs 3, to support the seat 2 and the user U, etc., there are no particular limitations on the material, and the support base 4 can be made of any material, such as wood, resin, or metal.

The backrest 5 is a portion that supports the user U's waist and/or back in a horizontal direction from behind. The user U can sit on the seat 2 and relax by leaning his/her waist and/or back on the backrest 5. As shown in Figs. 1 to 4, the backrest 5 is fixed to the rear leg 32 and connected to the seat 2 via the rear leg 32. The backrest 5 may be connected to the seat 2 directly or via another member other than the rear leg 32. The backrest 5 (the surface that the waist and/or back contact) is curved in an approximately arc shape so as to be convex toward the rear. The backrest 5 is formed in an approximately arc shape, so that the user U can sit stably because the waist and/or back are supported from the side so that they are partially surrounded within a horizontal plane. Furthermore, as described above, when the user sits on the chair 1 close to a low desk or table, the user needs to rotate the body while seated on the seat surface 2a of the seat 2 to avoid the desk or table when standing up. However, the use of the approximately arc-shaped backrest 5 makes it easier to rotate the body. When the user sits with the knees bent at an angle greater than a right angle, as in the chair 1 of this embodiment, the user cannot push the legs firmly against the floor F, making it difficult to rotate the body while seated using only the strength of the legs. At that time, the user presses the waist and/or back against the approximately arc-shaped backrest 5, which guides the waist and/or back to the backrest 5, making it easy to rotate the body. Even when the user presses the waist and/or back against the backrest 5 in this way, the support base 4 protrudes rearward from the seat 2, and the chair 1 is prevented from tilting backward, so the user U can press the waist and/or back against the backrest 5 with confidence.

The backrest 5 may be curved in an approximately arcuate shape so as to be convex toward the rear, and is not particularly limited, but is preferably curved to have a radius of curvature that is approximately equal to or slightly larger than the radius of the seat 2 in the horizontal plane. The approximately equal or slightly larger radius of curvature here means that the radius is approximately equal to the radius of the seat 2 in the horizontal plane, or is within 24%, preferably within 20%, and more preferably within 16% of the radius of the seat 2 in the horizontal plane and is larger than the radius of the seat 2 in the horizontal plane. By having the backrest 5 have a radius of curvature that is approximately equal to or slightly larger than the radius of the seat 2 in the horizontal plane, when the body is rotated while in a seated position, the hips and/or back are guided so that the body rotates along the outer edge of the seat 2, making it easy to rotate the body. In addition, the horizontal distance between the outer edge of the seat 2 in the direction in which the body faces and the backrest 5 is approximately the same in any rotation position, so that the person can stand up in the same way.

The material of the backrest 5 is not particularly limited as long as it has the strength to horizontally support the waist and/or back of the user U, and it can be made of any material such as wood, resin, metal, etc.

The chair 1 may further include a pair of armrests 6, 6, as desired. As shown in Figs. 1 to 5, the pair of armrests 6, 6 are formed continuously from both horizontal ends of the backrest 5 to the backrest 5 without any other members. By providing the armrests 6, 6 to the chair 1, the user U can rest both elbows on the armrests 6, 6 when sitting on the chair 1, and can sit on the chair 1 more comfortably. Furthermore, the user U can use the armrests 6, 6 as support when standing up from the chair 1, and can easily stand up from the chair 1. Here, when the user U stands up from the chair 1 using the armrests 6, 6 as support, the armrests 6, 6 are pressed downward. Since the armrests 6, 6 are located forward of the rear leg 32 connected via the backrest 5, a rotational moment is generated in the chair 1 in a direction tilting forward around the rear leg 32. However, because the rear leg 32 to which the armrests 6, 6 are connected is tilted backward, part of the downward pressure acts to tilt the chair 1 backward (escapes backward). This prevents the chair 1 from tilting forward, so the user U can rest assured that he or she can use the armrests 6, 6 for support. Note that the backward tilt of the chair 1 is prevented by the support base 4 protruding rearward from the seat 2, as described above.

The pair of armrests 6, 6 may extend forward from the backrest 5 so that the user U can easily rest his/her elbows on them. Although there is no particular limitation, as shown in Figs. 5 and 6, it is preferable that the armrests 6, 6 are arranged so that the farther they are from the seat 2 in the horizontal direction, the farther they are from the backrest 5. This prevents the armrests 6, 6 from hindering the user U when he/she stands up from the chair 1 by rotating his/her body in a horizontal plane, so that the user U can easily stand up from the chair 1. In this embodiment, the armrests 6 are formed in an approximately arc shape so that the horizontal inner surface of the armrests 6 has a radius of curvature approximately equal to that of the horizontal inner surface of the backrest 5. As a result, when the user U rotates his/her body on the seat surface 2a of the seat 2 as described above, the body is continuously guided not only along the backrest 5 but also along the armrests 6, so that the body can be easily rotated over a larger angular range.

As long as the armrest 6 has the strength to support the user U's elbow when he/she sits down and to support the user U when he/she stands up, there is no particular limitation on the material, and the armrest 6 can be made of any material such as wood, resin, or metal.

Reference Signs List 1 chair 2 seat 2a seat surface 2b tip region 2c side region 3 leg 31 front leg 32 rear leg 4 support base 5 backrest 6 armrest 7 connection member 71 side connection member 72 rear connection member C cushion F floor H height from floor to seat surface of seat S space U user WS fixing device X width direction Y front-rear direction Z up-down direction

Claims (2)

A chair that is placed on a floor and used,
A seat on which a user sits;
A leg portion connected to the seat portion;
A support base connected to the leg and placed on the floor surface;
A backrest portion connected to the seat portion,
The seat is disposed so that the height from the floor surface to the seat surface of the seat is lower than the height from the soles of the feet to below the knees of the user,
The support base is disposed so that a rear end of the support base is located rearward of a rear end of the seat portion,
A space is formed between the seat and the floor surface below the front end region of the seat and below a lateral region behind the front end region of the seat, where the legs and the support base are not present, and into which at least a part of the user's lower leg can be inserted;
The backrest portion is curved in a substantially arcuate shape so as to be convex toward the rear ,
The chair further has a pair of armrests formed continuously from both ends of the backrest in the horizontal direction to the backrest,
The pair of armrests are arranged so as to move away from the seat in a horizontal direction as they move away from the backrest,
The leg portion includes a rear leg portion extending continuously from the support base to the backrest portion,
The rear leg portion is inclined rearward from the support base toward the backrest portion,
The thickness of the seat in the vertical direction is 50 mm or less,
The height from the floor surface to the seat surface of the seat is 150 mm or more and 350 mm or less .
Chair. The leg portion includes a front leg portion that supports a front side of the seat portion,
The chair according to claim 1 , wherein a horizontal cross section of the front leg portion is formed so as to extend in the front-rear direction.