JP7239290B2 - Chair - Google Patents

Description

The present invention relates to chairs.

2. Description of the Related Art Conventionally, as a backrest provided in a chair, there is known one provided with a lumbar support for supporting the lumbar region of a seated person in a pressing manner, as disclosed in Patent Documents 1 and 2, for example.
Patent Document 1 describes a configuration in which the lumbar support plate is arranged on the front side of the backrest by engaging an insertion piece that supports the lumbar support plate as a lumbar support with the rear edge of the seat. .

Further, Patent Literature 2 describes a configuration in which an elastic frame that supports a lumbar support section (lumbar support) in front of a backrest member is connected to and supported by the lower surface of a seat section. The elastic frame forms part of the backrest and is biased upward by a spring provided in another elastic frame located below the elastic frame in side view. With such a configuration, a pressing force can be applied to the lumbar vertebrae of the seated person in front of the backrest, that is, at a position closer to the back of the seated person.

Japanese Utility Model Publication No. 63-042854 JP 2006-141859 A

However, conventional chairs with lumbar support have the following problems.
That is, in the case of Patent Document 1, the fulcrum when the waist support plate is elastically deformed by the load of the seated person is located on the upper surface of the seat. That is, since the fulcrum is at approximately the same height as the lumbar region of the seated person, there is very little room for elastic deformation by the occupant, and although a large pressing force on the lumbar region of the seated person can be ensured, the lumbar region of the occupant can be seated for a long time. In this case, there is a possibility that the seated person may feel uncomfortable.

In addition, in the case of Patent Document 2, the elastically deformable elastic frame is connected to the lower surface of the seat portion, that is, the portion closer to the lumbar spine of the seated person, so that it is easy to move against the movement of the seated person's back. will be displaced to Therefore, it has been difficult to apply a large pressing force to the lumbar region of the seated person.

In this way, in the case of conventional chairs, the lumbar support has a structure that makes it difficult to follow the tilting of the backrest. Second, the backrest and lumbar support are separated from each other, making it easier for the lumbar support to move back and forth. Therefore, since the seated person cannot obtain sufficient pressing force from the lumbar support, there is room for improvement in this respect.

The present invention has been made in view of the above-mentioned problems, suppresses the elastic deformation due to the load of the lumbar region of the seated person to an appropriate range, and stably increases the lumbar region of the seated person regardless of the posture of the backrest. To provide a chair which can apply pressing force and is excellent in sitting comfort.

In order to achieve the above object, the chair according to the present invention comprises a support structure, a seat supported on the upper part of the support structure and supporting the buttocks of the occupant, and a chair extending rearwardly and upwardly from the support structure. an extended backrest support member, a backrest supported by the backrest support member and tiltable by receiving the load of a seated person on the backrest surface, supported by the backrest support member, a lumbar support arranged forward of the back support surface , and a support portion of the lumbar support for the backrest support member is positioned below the seat .

In the present invention, the lumbar support is supported by the backrest support member connected to the support structure, and the portion that becomes the fulcrum when the backrest support member is elastically deformed when the backrest tilts is spaced apart from the seat. When the seated person leans against the backrest and tilts the backrest, the lumbar support can follow the backrest. Therefore, regardless of the tilting posture of the backrest, the lumbar support can be maintained in a state of being held from behind by the backrest, and elastic deformation due to the load of the lumbar region of the seated person can be suppressed within an appropriate range.
In other words, when the lumbar support is supported by the seat and it is difficult for the lumbar support to follow the tilting of the backrest, the lumbar support separates from the backrest and elastic deformation of the lumbar support extends over a wide range. can be suppressed. Therefore, according to the present invention, it is possible to stably apply a large pressing force to the lumbar region of the seated person, and to provide a chair that is excellent in sitting comfort.

In addition, in the present invention, since the entire lumbar support is located forward of the back support surface of the backrest, it is elastically deformed by the load of the seated person as in the case where the lumbar support is supported behind the backrest. Since the fulcrum of the seat is on the upper surface of the seat and is at substantially the same height as the lumbar region of the seated person, it is possible to suppress the elastic deformation of the lumbar support from becoming small. Therefore, it is possible to prevent the pressing force on the lumbar region of the seated person from becoming too large, and to improve the sitting comfort of the seated person when sitting for a long time.

In this case, the support with the lumbar support can be arranged at the horizontal portion extending rearwardly from the support structure of the backrest support member. Therefore, it is possible to ensure a sufficient length of extension from the horizontal portion of the backrest support member in the lumbar support, and it is possible to make the extension direction of the lumbar support closer to the vertical direction. Therefore, the elastic deformation due to the load on the lumbar region of the seated person can be suppressed within an appropriate range, and a large pressing force can be applied to the lumbar region of the seated person.
Moreover, in the present invention, since the support portion of the lumbar support for the backrest support member is hidden by the seat, the support portion is difficult to see from the outside, and the design can be improved.

Further, the chair according to the present invention comprises a support structure, a seat supported on the upper part of the support structure for supporting the buttocks of the occupant, and a back extending rearwardly and upwardly from the support structure. a backrest support member, a backrest supported by the backrest support member and tiltable by receiving the load of a seated person on the backrest surface; a lumbar support disposed further forward, the lumbar support having a supported portion supported by the backrest support member, and a body support portion extending upward from the supported portion. It is characterized by comprising a lumbar support supporting member and a lumbar support body supported by the lumbar support supporting member.

In this case, since the lumbar support supporting member and the lumbar support main body are separately provided, the lumbar support main body can be supported by the main body supporting portion of the lumbar support supporting member so as to be vertically movable.

Further, in the chair according to the present invention, the lumbar support body includes a lumbar pad and a load supporting member attached to the lumbar pad and detachably supported with respect to the lumbar support supporting member. It may be characterized by

In this case, the lumbar pad and the load supporting member attached to the lumbar support supporting member can be easily made of different materials. Therefore, the load-bearing member can be formed in a structure that can provide a supporting force, and the lumbar pad can be made of a material that easily supports the lumbar region of the seated person.

According to the chair of the present invention, the elastic deformation of the seated person's lumbar spine caused by the load can be suppressed within an appropriate range, and a large pressing force can be stably applied to the seated person's lumbar spine regardless of the posture of the backrest. , can provide excellent seating comfort.

1 is a front perspective view of a chair according to an embodiment of the present invention; FIG. It is the perspective view which looked at the chair shown in FIG. 1 from diagonally back, Comprising: It is the figure which abbreviate|omitted the face material of the backrest. Figure 2 is a side view of the chair shown in Figure 1; FIG. 2 is an exploded perspective view of the chair as viewed obliquely from the front, omitting the seat; FIG. 4 is a vertical cross-sectional view of the support portion of the lumbar support cut at the center in the width direction of the chair, showing the support structure of the base portion, the backrest support member, and the lumbar support. It is the exploded perspective view which looked at the backrest from diagonally back. Fig. 2 is an exploded perspective view of a backrest supporting member provided with a backrest and a lumbar support as seen obliquely from the front; Fig. 3 is an exploded perspective view of the lumbar support as seen obliquely from behind; FIG. 4 is a perspective view of the lumbar support as seen obliquely from the rear, omitting the lumbar pad.

A chair according to an embodiment of the present invention will be described below with reference to the drawings.

The chair 1 according to the present embodiment shown in FIGS. 1 to 4 is used for office work in which a person M (see FIG. 3) sits and performs office work.
In the following description, the front side of a person (seated person M shown in FIG. 3) sitting on the chair 1 in a normal posture is called "front", and the opposite side is called "back". Regarding "upper", "lower" and "left", "right", the upper side of the seated person M in the normal posture on the chair 1 is called "upper", and the opposite side is called "lower". The left and right direction is called the width direction, the left side of the seated person M is called "left", and the opposite side is called "right". 1 to 3, the arrow FR points forward, the arrow UP points upward, and the arrow LH points leftward. Moreover, in each embodiment, the same code|symbol shall be attached|subjected to a common part and the overlapping description shall be abbreviate|omitted.

The chair 1 includes a support structure 2 placed on a floor F, a seat 3 supported on the upper part of the support structure 2 and supporting the buttocks of a seated person M, and a seat 3 extending rearward from the support structure 2 and extending upward. a backrest support member 4 extending from the backrest support member 4; 4 and a lumbar support 10 arranged in front of the back receiving surface 5a.

The support structure 2 includes legs 21 placed on the floor F and box-shaped support bases 22 placed on the upper ends of the legs 21 .
The leg portion 21 includes a multiplicity leg 211 with casters, and a pedestal 212 that rises from the central portion of the multiplicity leg 211 and incorporates a gas spring that is an elevating mechanism. It is mounted rotatably around a pedestal 212 .

The support base 22 incorporates an elevation adjustment mechanism for the pedestal 212 and a tilt adjustment mechanism for the backrest 5 . The support base 22 is provided with a metal base portion 23 for fixing the backrest support member 4 and the lumbar support 10 in a substantially horizontally protruding state rearward.

As shown in FIG. 4, the base portion 23 protrudes upward from a support receiving plate 231 having a proximal front portion 23a fixed to the rear portion of the support base 22 and both ends of the support receiving plate 231 in the width direction. and a guide plate 232 (see FIG. 5).
The base portion 23 is configured to receive the first member 41 of the backrest support member 4 , which will be described later, on the upper surface 231 a of the support receiving plate 231 . That is, the base portion 23 is fastened and fixed by three fixing bolts 24 and nuts 25 in a state in which the base portion 23 is vertically superimposed on the backrest support member 4 . A front portion 23 a of the base portion 23 is connected to a tilt adjustment mechanism provided within the support base 22 .

The support receiving plate 231 is formed with three first bolt holes 233 penetrating in the thickness direction. Two of these first bolt holes 233 are arranged on the front side of the support receiving plate 231 at intervals in the width direction, and one is arranged on the rear side at the center position in the width direction of the first bolt hole 233 on the front side. . Fixing bolts 24 for fixing the backrest support member 4 and the lumbar support 10 are inserted through the respective first bolt holes 233 .

The seat 3 has a seat frame 31 forming an outer shell of the seat 3 and a seat surface member 32 stretched on the seat frame 31, as shown in FIGS.

The backrest support member 4 is a strength member connected to a base portion 23 projecting rearward from the support base 22 . The backrest support member 4 is spaced rearward from the rear end portion 3b of the seat 3. As shown in FIG.
As shown in FIGS. 4 and 5, the backrest support member 4 is arranged to extend rearward from the support base 22 of the support structure 2 and is connected to the base portion 23 of the support base 22 . It consists of a member 41 and a second member 42 that extends upward from a fixing portion that is fixed to the first member 41 and supports the backrest 5 . In this embodiment, the first member 41 and the second member 42 are integrally formed of metal such as aluminum or resin having a predetermined strength.

The first member 41 has an upper support wall 411 and a pair of side support walls 412, 412, and is formed in a substantially U-shape opening downward when viewed from the front. The opening side of the first member 41 formed in a substantially U-shape is arranged in a state in which the pair of guide plates 232 , 232 of the base portion 23 are externally fitted.

The upper support wall 411 is smoothly curved so as to gradually go upward from the front side to the rear side. A front lower surface 411 a of the upper support wall 411 is arranged to face the support receiving plate 231 side of the base portion 23 . A plurality of plate-shaped guide ribs 413 extending in the front-rear direction are arranged at intervals in the width direction on the front lower surface 411a of the upper support wall 411 . A lower end 413 a of the guide rib 413 is in contact with the upper surface 231 a of the support receiving plate 231 of the base portion 23 . The protrusion height of these guide ribs 413 is set larger than the height of the guide plate 232 of the base portion 23 from the upper surface 231a of the support receiving plate 231 .
The interval between the guide ribs 413 is set to a dimension that allows the fixing bolt 24 to be inserted.

Three second bolt holes 414 are formed through the upper support wall 411 in the thickness direction. These second bolt holes 414 are arranged at positions vertically coaxial with the first bolt holes 233 of the base portion 23 in a state where the first member 41 is arranged on the base portion 23 of the support base 22 . there is Fixing bolts 24 for fixing the support base 22 (base portion 23 ) and the lumbar support 10 are inserted through the respective second bolt holes 414 .

The pair of side support walls 412 , 412 extends downward from both widthwise ends of the upper support wall 411 along the outer surface of the guide plate 232 of the base portion 23 . The distance between the pair of side support walls 412 , 412 matches the distance between the outer surfaces of the pair of guide plates 232 , 232 of the base portion 23 . The pair of side support walls 412 , 412 are guided from above along the outer surfaces of the pair of guide plates 232 , 232 on the width direction outer side and are engaged with each other, thereby determining the position in the width direction.

As shown in FIG. 3, the backrest 5 is attached to the rear upper portion of the backrest support member 4, which is substantially L-shaped in side view, and directly supports the back of the seated person M seated on the seat 3 with the backrest surface 5a. part. The backrest 5 has, as shown in FIG.

As shown in FIG. 6, the back frame member 50 connects a pair of vertical frame members 51, 51 spaced apart in the width direction of the backrest 5 and the upper ends of the pair of vertical frame members 51, 51. It has an upper frame member 52 and a lower frame member 53 that connects the lower ends of the pair of vertical frame members 51, 51 (see FIG. 2). The pair of vertical frame members 51, 51, the upper frame member 52, and the lower frame member 53 are integrally formed of, for example, resin or the like in an annular shape, and are configured to be elastically deformable according to the force acting from the face member 54. .

Groove portions 501 recessed inwardly of the backrest 5 are continuously formed in the outer peripheral edge portions of the pair of vertical frame members 51, 51, the upper frame member 52, and the lower frame member 53 in the circumferential direction. The groove portion 501 is configured to engage a frame-shaped winding frame 55 in which the outer peripheral end portion of the face member 54 is wound. The winding frame 55 is formed in a frame shape having substantially the same shape as the back frame member 50 .

The face member 54 is arranged at the front side of the backrest 5 with its outer peripheral edge portion, and is engaged with the groove portion 501 in a state in which it is wound in a state in which a predetermined tension is applied so as to wrap around the winding frame 55 to the outside. are doing. The face member 54 is configured to receive the load of the seated person M leaning against the backrest 5, as shown in FIG.

The pair of vertical frame members 51, 51 respectively extend along the vertical direction. Specifically, as shown in FIG. 6, the pair of vertical frame members 51, 51 are curved so as to gradually extend outward in the width direction and forward as they extend downward. The upper frame member 52 extends in the width direction and is formed in a substantially linear shape, and both ends in the width direction are connected to the upper end portions of the pair of vertical frame members 51 , 51 .

The lower frame member 53 extends in the width direction, and both ends in the width direction are connected to the lower ends of the pair of vertical frame members 51 , 51 . The lower frame member 53 is curved throughout so that the center portion in the width direction protrudes rearward from both end portions. The lower frame member 53 is integrally fixed to the upper end portion of the backrest support member 4 . In this embodiment, a plate-like lower frame cover 56 that is curved like the lower frame member 53 is attached to the rear surface of the lower frame member 53 .

As shown in FIG. 3, the lumbar support 10 is arranged at a position corresponding to the lumbar spine Ma of the seated person M seated on the chair 1, and is configured to receive the load of the seated person M from the front side to the rear side. A support portion R (see FIGS. 1 and 5 ) of the lumbar support 10 for the backrest support member 4 is located below the seat 3 .

The lumbar support 10, as shown in FIGS. 7 to 9, includes a lumbar support support member 11 supported by the backrest support member 4, and a lumbar support body 12 supported by the lumbar support support member 11. .

The lumbar support support member 11, as shown in FIG. A body support portion 14 extending upward from 13 is provided, and the supported portion 13 and the body support portion 14 are integrally provided.

As shown in FIGS. 5 and 7 to 9, the supported portion 13 includes a pair of lower frame portions 131, 131 positioned on both left and right sides in the width direction, and a surface connecting the lower frame portions 131, 131 to each other. and a mounting plate 132 oriented substantially horizontally. The mounting plate 132 is supported in contact with the top surface 411b of the upper support wall 411 of the first member 41 of the backrest support member 4 . Three third bolt holes 133 are formed through the mounting plate 132 in the thickness direction. These third bolt holes 133 are vertically coaxial with the first bolt holes 233 of the base portion 23 in a state where the first member 41 of the backrest support member 4 is arranged on the base portion 23 of the support base 22 . are placed in different positions. A fixing bolt 24 for fixing to the support base 22 (base portion 23) and the backrest support member 4 (first member 41) is inserted through each third bolt hole 133 from below. A nut accommodating portion 133a is formed in the upper portion of the third bolt hole 133 that opens to the upper surface of the mounting plate 132 so that a nut 25 (see FIG. 5) that is screwed onto the fixing bolt 24 can be locked.

The body support portion 14 is arranged along the front surface of the face member 54 of the backrest 5 . The body support portion 14 includes a pair of left and right vertical frame portions 141, 141 in the width direction extending upward from the lower frame portion 131 of the supported portion 13, and an upper frame portion connecting upper ends of the vertical frame portions 141 to each other. 142 and . The pair of vertical frame portions 141, 141 are curved gradually forward from the upper and lower ends toward the center in the vertical direction. The curved shape of the vertical frame portion 141 is set to be substantially the same as the curved shape of the face member 54 .
A locking convex portion 143 projecting forward is formed in the vertical central portion of the front surface 141 a of each vertical frame portion 141 . This engaging projection 143 is engaged in a slit 166 of the load supporting member 16, which will be described later, so as to be vertically movable.

The lumbar support body 12 includes a urethane lumbar pad 15 and a load support member 16 mounted on the lumbar pad 15 and detachably supported on the body support portion 14 of the lumbar support support member 11 and vertically movable. and have.

As shown in FIGS. 7 and 8, the lumbar pad 15 has a central portion 151 arranged in the center in the width direction, and side portions 152, 152 arranged on both sides of the central portion 151 in the width direction. ing. The side portions 152 are shaped so as to gradually incline forward as they move outward in the width direction from the central portion 151 and extend forward from the upper portion to the lower portion. The lumbar pad 15 has a concave shape with a central portion 151 protruding rearward when viewed from above, and is formed so as to wrap the lumbar vertebrae Ma of the seated person M from behind as shown in FIG. 3 inside this concave shape. .

A holding piece 154 is provided on the rear surface 151a of the central portion 151, as shown in FIG. For the holding piece 154, for example, a so-called Velcro tape (registered trademark) that has a hook-like raised portion on one side and is attached to the loop-shaped raised portion on the other side can be used. It holds the upper frame part 142 so as to be wound.
A pocket portion 153 having an opening 153a on the central portion 151 side is formed on the rear surface of the side portion 152 .

As shown in FIGS. 7 to 9, the load supporting member 16 is formed of a thin plate member made of resin, and has an outline shape that substantially overlaps the lumbar pad 15 when viewed from the rear. The load bearing member 16 includes a pair of vertically extending plate-like bodies 161, 161, an upper connecting member 162 connecting upper ends of the pair of vertical plate-like bodies 161, 161, the pair of vertical plate-like bodies 161, 161, a pair of binding bands 164 connecting the vertical middle portions of the pair of vertical plates 161, 161 and extending in the width direction, the lower connecting member 163, a pair of and a side frame member 165 projecting outward in the width direction from each of the vertical plates 161 , 161 .

Here, the vertical plate-like body 161, the upper connecting member 162, the lower connecting member 163, and the side frame members 165 form a frame-like body 160 integrally formed. In the frame-shaped body 160, at least the front ends of the pair of side frame members 165, 165 are elastically deformable inward in the width direction. The frame-shaped body 160 is supported and mounted with the pair of side frame members 165 inserted into the pocket portions 153 (see FIG. 8) of the lumbar pad 15 in a bent state. An arrow E2 shown in FIG.

The interval between the vertical plates 161 , 161 matches the interval between the pair of vertical frame portions 141 , 141 of the main body support portion 14 of the lumbar support support member 11 .
The pair of restraint bands 164, 164 are made of, for example, a member made of cloth or resin, and are separated from each other in the vertical direction on the rear surface (abutted surface 161a shown in FIG. 8) side of the pair of vertical plate-like bodies 161, 161. are placed open. The restraint band 164 is fixed by, for example, adhesive means or the like in a state in which both ends 164a, 164a in the longitudinal direction (width direction) wrap around the front surface 161b (see FIG. 7) of the vertical plate-like body 161, respectively. The restraint band 164 is loosely arranged so as to have a gap with respect to the contacted surface 161 a of the vertical plate-like body 161 .

As shown in FIGS. 2, 8 and 9, the load bearing member 16 is configured such that the main body supporting portion 14 of the lumbar support supporting member 11 is positioned between the frame 160 and the restraining band 164 as indicated by the arrow E1 in FIG. is provided so that it can be inserted into the As the frame-shaped body 160 is bent and deformed, a tensile force is generated in the length direction (width direction) of the restraint band 164, and the restraint band 164 is pressed against the contacted surface 161a of the vertical plate-shaped body 161. press in the direction That is, by attaching the frame-shaped body 160 to the lumbar pad 15 , the restraint band 164 presses the body support portion 14 of the lumbar support support member 11 against the vertical plate-shaped body 161 , and the body support portion 14 is held by the lumbar support body 12 . will be

The height position of the restraining band 164 in the vertical direction with respect to the main body support portion 14 may be an arbitrary position, or an engaging portion (not shown) that can be positioned at a predetermined position on the vertical frame portion 141 of the main body support portion 14 omitted) may be provided.
Then, when the lumbar support main body 12 is pushed toward the backrest 5, the side frame members 165, 165 are pushed out by the shape of the face member 54 (convex curved surface projecting rearward), and the entire load supporting member 16 is turned rearward. Transform into a convex shape.

A slit 166 is formed in the lower part of the vertical plate-like body 161 so as to penetrate in the thickness direction and extend in the vertical direction. A locking projection 143 formed on the lumbar support support member 11 is locked to the slit 166 so as to be movable within the slit 166 .

Next, a method for attaching the lumbar support 10 to the backrest support member 4 will be described in detail.
First, as shown in FIGS. 8 and 9, the lumbar support 10 is assembled.
The load bearing member 16 of the lumbar support main body 12 is attached to the lumbar support supporting member 11 . Specifically, the main body support portion 14 of the lumbar support support member 11 is placed downward in the direction of arrow E1 in FIG. and place it at the specified height.

Next, as shown in FIG. 8, the side frames 165 of the load bearing member 16 supported by the lumbar support supporting member 11 are inserted into the left and right pocket portions 153 of the lumbar pad 15 in the direction of the arrow E2, respectively. The connecting member 162 and the lower connecting member 163 are fixed by the holding piece 154 . The lumbar support 10 is thus assembled.

Next, as shown in FIG. 4, the first member 41 of the backrest support member 4 supporting the backrest 5 is engaged with the base portion 23 of the support base 22 from above. Specifically, the side support walls 412 of the first member 41 are arranged along the outer surfaces of the pair of guide plates 232 of the base portion 23, and as shown in FIG. The lower end 413a of 413 is brought into contact with the upper surface 231a of the support receiving plate 231 of the base portion 23 .

Next, the lumbar support support member 11 of the lumbar support 10 is attached to the upper surface 411 b of the upper support wall 411 of the first member 41 . Specifically, the placing plate 132 of the supported portion 13 of the lumbar support supporting member 11 is placed on the upper surface 411b of the upper supporting wall 411 and positioned. At this time, the bolt holes (the first bolt hole 233, the second bolt hole 414, and the third bolt hole 133) of the base portion 23, the first member 41, and the supported portion 13 are positioned coaxially, and each bolt The fixing bolt 24 is inserted through the holes 233, 414, and 133 from below, and is screwed into the nut 25 locked in the nut accommodating portion 133a of the third bolt hole 133 to fasten. As a result, the backrest 5 is supported by the base portion 23 of the support base 22 via the backrest support member 4 , and the lumbar support 10 is also supported by the support portion R.

Here, when changing the height of the lumbar support main body 12 after the lumbar support 10 is attached, the height can be changed by manually moving the lumbar support main body 12 with respect to the main body supporting portion 14 of the lumbar support supporting member 11 . can be adjusted.

Next, the operation of the chair 1 described above will be described in detail based on the drawings.
In the chair 1 according to this embodiment, as shown in FIGS. 3 and 5, the lumbar support support member 11 is supported by the backrest support member 4 connected to the base portion 23 provided on the support base 22 of the support structure 2. When the seated person M leans against the backrest 5 and tilts the backrest 5, the fulcrum of the elastic deformation of the backrest support member 4 when the backrest 5 tilts is separated from the seat. In addition, the lumbar support 10 can also follow the backrest 5. Therefore, regardless of the tilting posture of the backrest 5, the state in which the lumbar support 10 is held from behind by the backrest 5 can be maintained, and the elastic deformation due to the load of the lumbar vertebrae Ma of the seated person M is kept within an appropriate range. can be suppressed.

In other words, when the lumbar support is supported by the seat and it is difficult for the lumbar support to follow the tilting of the backrest, the lumbar support separates from the backrest and elastic deformation of the lumbar support extends over a wide range. can be suppressed. Therefore, in this embodiment, a large pressing force can be stably applied to the lumbar region Ma of the seated person M, and the chair 1 with excellent sitting comfort can be provided.

In addition, in this embodiment, since the entire lumbar support 10 is positioned forward of the back support surface of the backrest, the lumbar support 10 is supported behind the backrest 5, so that the seated person M can The fulcrum when elastically deformed by the load is on the upper surface of the seat 3 and is at substantially the same height as the lumbar vertebrae Ma of the seated person M, so that the elastic deformation of the lumbar support 10 can be suppressed from becoming small. Therefore, it is possible to prevent the pressing force on the lumbar vertebrae Ma of the seated person M from becoming too large, so that the sitting comfort of the seated person M can be improved when sitting for a long time.

In this embodiment, as shown in FIG. 3, the support portion R of the lumbar support 10 for the backrest support member 4 is located below the seat 3, so that the support structure 2 for the backrest support member 4 A support for the lumbar support can be arranged at a horizontal portion (first member 41) extending rearwardly from the . Therefore, the length of the backrest support member 4 in the lumbar support 10 extending from the first member 41 can be sufficiently ensured, and the extending direction of the lumbar support 10 can be made closer to the vertical direction. Therefore, the elastic deformation of the lumbar vertebrae Ma of the seated person M due to the load can be suppressed within an appropriate range, and a large pressing force can be applied to the lumbar vertebrae Ma of the seated person M as much as possible.
Moreover, in the present embodiment, since the support portion R of the lumbar support 10 with the backrest support member 4 is hidden by the seat 3, the support portion R is difficult to see from the outside, and the design can be improved. can.

Further, in this embodiment, since the second member 42 of the backrest support member 4 is spaced rearward from the rear end portion 3b of the seat 3, the second member 42 passes through the space formed between the seat and the backrest support member. lumbar support can be placed. That is, the support portion R, which is the support portion of the lumbar support 10, can be positioned downward through the space. Therefore, the elastic deformation of the lumbar vertebrae Ma of the seated person M due to the load can be suppressed within an appropriate range, and a large pressing force can be applied to the lumbar vertebrae Ma of the seated person M as much as possible.

Furthermore, in the present embodiment, the backrest support member 4 can be provided separately from the first member 41 and the second member 42 . In this case, the first member 41 supporting the lumbar support 10 is not bound by the material and strength required for the second member 42 supporting the backrest 5 . Therefore, since the material and strength of the first member 41 can be set to support the lumbar support 10, it is possible to widen the selection range of the mode of the lumbar support 10 itself.

Furthermore, in this embodiment, since the lumbar support supporting member 11 and the lumbar support main body 12 are provided separately, the lumbar support main body 12 can be vertically moved with respect to the main body supporting portion of the lumbar support supporting member 11. can be supported.

In addition, in the case of this embodiment, the lumbar support body 12 includes a lumbar pad 15 and a load supporting member 16 attached to the lumbar pad 15 and detachably supported on the lumbar support supporting member 11. Because of the configuration, the lumbar pad 15 and the load supporting member 16 attached to the lumbar support supporting member 11 can be easily made of different materials. Therefore, the load bearing member 16 can be formed in a structure that can obtain a supporting force, and the lumbar pad 15 can be made of a material that easily supports the lumbar spine Ma of the seated person M.

As described above, in the chair 1 according to the present embodiment, the elastic deformation of the lumbar vertebrae Ma of the seated person M due to the load is suppressed within an appropriate range, and a large pressing force is applied to the lumbar vertebrae Ma of the seated person M regardless of the posture of the backrest 5 . can be imparted, and a product excellent in sitting comfort can be provided.

Although the embodiments of the chair according to the present invention have been described above, the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the present invention.

For example, in the present embodiment, the support portion R of the lumbar support support member 11 of the lumbar support 10 for the backrest support member 4 is positioned below the seat 3, but is limited to being below the seat 3. never For example, the support R may be positioned behind the seat 3 and below the gap between the rear end 3 b of the seat 3 and the second member 42 of the backrest support member 4 .

Further, in the present embodiment, the backrest support member 4 (second member 42) is spaced rearward from the rear end portion 3b of the seat 3, but they may be in contact with each other. In this case, for example, by providing a recess in the rear portion of the seat 3 through which the lumbar support support member 11 can be inserted below the seat 3 , the support portion R of the lumbar support support member 11 can be replaced by the first member 41 of the backrest support member 4 . can be supported by

Furthermore, in the present embodiment, the first member 41 connecting the backrest support member 4 to the support structure 2 and the second member 42 supporting the backrest 5 are integrally formed. It may be provided separately.

Further, in this embodiment, the mounting structure is such that the backrest support member 4 is connected to the base portion 23 projecting in the direction from the support base 22 and the lumbar support support member 11 is supported. The configuration may be such that the backrest support member 4 is connected to the support base 22 by omitting it.
In this embodiment, the fixing bolt 24 and the nut 25 are used as the supporting portion R of the lumbar support supporting member 11. However, it is not limited to bolt fastening, and other fixing means may be employed. It is possible.

Furthermore, the configuration of the lumbar support 10 is not limited to the embodiment described above, and can be changed as appropriate. For example, in the present embodiment, the supported portion 13 and the body support portion 14 of the lumbar support support member 11 are integrally formed, but they may be provided separately. Furthermore, the lumbar support supporting member 11 and the lumbar support main body 12 may be integrally formed.

In addition, in this embodiment, the lumbar support body 12 includes a lumbar pad 15 and a load supporting member 16 that is attached to the lumbar pad 15 and detachably supported on the lumbar support supporting member 11. However, the lumbar pad 15 and the load support member 16 may be integrated.
Furthermore, in the present embodiment, the load support member 16 is supported on the main body support portion 14 of the lumbar support support member 11 using the restraint band 164 so that the height can be adjusted. is not limited to providing.

Furthermore, the lumbar support support member 11 may be integrated with the backrest support member 4 . In this case, the face material 54 of the backrest 5 can be constructed by stretching so as to avoid the overlapping portion of the lumbar support supporting member 11 .
Further, the backrest support member 4 and the backrest 5 may be integrated.

In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the scope of the present invention.

REFERENCE SIGNS LIST 1 chair 2 support structure 3 seat 4 backrest support member 5 backrest 5a back receiving surface 10 lumbar support 11 lumbar support support member 12 lumbar support main body 13 supported portion 14 main body support portion 15 lumbar pad 16 load support member 22 support base 23 Base part 24 Fixing bolt 41 First member 42 Second member 54 Face material M Seated person Ma Lumbar vertebrae R Support part

Claims (3)

a support structure;
a seat supported on the upper part of the support structure and supporting the buttocks of the seated person;
a backrest support member extending rearwardly and upwardly from the support structure;
a backrest supported by the backrest support member and tiltable by receiving the load of the seated person on the backrest surface;
a lumbar support supported by the backrest support member and arranged forward of the back support surface;
with
A chair , wherein a support portion of the lumbar support for the backrest support member is positioned below the seat . a support structure;
a seat supported on the upper part of the support structure and supporting the buttocks of the seated person;
a backrest support member extending rearwardly and upwardly from the support structure;
a backrest supported by the backrest support member and tiltable by receiving the load of the seated person on the backrest surface;
a lumbar support supported by the backrest support member and arranged forward of the back support surface;
with
The lumbar support is
a lumbar support supporting member having a supported portion supported by the backrest supporting member and a main body supporting portion extending upward from the supported portion;
a lumbar support body supported by the lumbar support supporting member;
A chair comprising: 3. The lumbar support body according to claim 2 , wherein the lumbar support body includes a lumbar pad and a load supporting member attached to the lumbar pad and detachably supported with respect to the lumbar support supporting member. listed chair.

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