JP6822821B2 - How to assemble a chair load bearing member, a chair, an upholstery material, and a chair load bearing member - Google Patents

Description

The present invention relates to a method for assembling a load supporting member for a chair, a chair, a tension material, and a load supporting member for a chair.

A chair is known to have a backrest that stands up from the rear part of the seat surface, and the backrest has a net-like upholstery material and a back frame that holds the outer peripheral portion of the upholstery material.
In the backrest of such a chair, the surface shape of the net-like upholstery material, that is, the shape of the load-bearing surface of the backrest is determined by the shape of the back frame that holds the outer peripheral portion of the upholstery material. For this reason, in the backrest using a net-shaped tension material, for example, it is difficult to dent a part of the load supporting surface rearward, and the degree of freedom in the shape of the load supporting surface is low.

On the other hand, for example, Patent Document 1 discloses a configuration in which a load-bearing surface is formed by sewing a plurality of net-shaped tension members together. In this configuration, the shape of the load-bearing surface is made three-dimensional by applying tension in the direction in which the seams are continuous by the seams that sew the tension members together.

Further, in Patent Document 2, the shape of the load-bearing surface is three-dimensionalized by holding a part of the net-like tension material forming the load-bearing surface so as to be pulled backward by a shape-retaining member provided on the back frame. The structure to be considered is disclosed.

International Publication No. 2005-112704 Japanese Unexamined Patent Publication No. 2011-24791

However, in the configuration disclosed in Patent Document 1, a plurality of upholstery materials must be sewn together, which is troublesome.
Further, in the configuration disclosed in Patent Document 2, when assembling the backrest, a part of the tension material must be fixed to the shape-retaining member provided on the back frame, which is troublesome.
Therefore, an object of the present invention is to increase the degree of freedom in the shape of the load supporting surface of the load supporting member for a chair such as a backrest, and to easily form a three-dimensional load supporting surface for a chair. The present invention provides a method for assembling members, chairs, upholstery members, and load-bearing members for chairs.

The present invention employs the following means in order to solve the above problems.
The load-bearing member for a chair according to the present invention includes a tension material that forms a load-bearing surface that receives the load of the seated person, and a frame material that supports the outer peripheral end of the tension material. The frame material includes a pair of first frame rods extending in the first direction along the load-bearing surface of the tension material and spaced apart from each other in the second direction intersecting the first direction. A second frame rod that connects one ends of the pair of the first frame rods,
To be equipped. The tension material is pulled toward the first portion fixed in a state where tension is applied along the second direction and the second frame rod side between the pair of the first frame rods. In a state where tension is applied, a second portion fixed to the central portion of the second frame rod in the second direction and both ends of the second frame rod in the second direction. It comprises a pair of fixed third sites. The second part is given a higher tension than the first part and the third part.

In this way, at the first portion between the pair of first frame rods, tension is applied along the second direction in which the pair of first frame rods face each other, and the tension is applied in the second direction. A tension in the pulling direction was applied to the second portion fixed to the second frame rod in the central portion toward the second frame rod side. With such a configuration, the load supporting surface formed by the tension material has a shape recessed in the load input direction at the second portion, as compared with the case where the outer peripheral portion of the tension material is simply fixed to the frame material. In this way, the load supporting surface can have a more three-dimensional shape.
Since the second part is tensioned higher than the first part and the third part, the upholstery is more depressed in the second part.

Further, the chair load support member according to the present invention is the chair load support member having two or more points of the second portion spaced apart from the second frame rod in the second direction. It may be fixed with.

In this way, by fixing the tension material to the second frame rod at two or more points, the tension in the direction of pulling the tension material to the second frame rod side applied to the second portion is the second tension material. It acts linearly from the point fixed to the frame rod in the first direction toward the other end side of the first frame rod in the first direction. As a result, in the upholstery material, a line that can be visually recognized from the point fixed to the second frame rod toward the other end side in the first direction can be formed, and the recessed portion can be easily visually recognized.

Further, the chair load support member according to the present invention is the chair load support member, in which the first frame rod is located at an intermediate portion between the one end portion and the other end portion of the first frame rod. The first portion of the upholstery material has a projecting portion that protrudes in a direction opposite to the load input direction with respect to the load supporting surface, and the first portion of the upholstery member is in the first direction of the first frame chair than the protruding portion. It may be formed in the region on the other end side.

With this configuration, tension along the second direction acts on the first portion located on the other end side in the first direction from the protruding portion of the first frame rod, while the second Tension along the second direction is less likely to act on the other end side of the second frame rod side than the protruding portion of the first frame rod. By providing the protruding portion on the first frame rod in this way, it is possible to clearly form a region on which tension acts in the second direction.
Further, the tension applied to the tension member in the second direction acts so as to linearly connect the protruding portions of the pair of first frame rods. On the other hand, when tension is applied to the tension material in the second portion in the direction of pulling toward the second frame rod, the applied tension is the protrusions of the second frame rod and the pair of the first frame rods. It acts intensively on the area connecting each other. Therefore, the load-bearing surface formed by the tension material is effectively recessed at the second portion, which is a region connecting the second frame rod and the protruding portions of the pair of first frame rods.

The chair according to the present invention includes a leg portion installed on the floor surface, a seat body supported by the leg portion, and a backrest supported by the leg portion and composed of a load supporting member for a chair as described above. , Equipped with.

With this configuration, the second portion of the load-bearing surface of the backrest formed by the upholstery can be formed into a recessed shape. In this way, the load supporting surface can have a more three-dimensional shape.

The tension material according to the present invention is a tension material used for the load supporting member for a chair as described above, and tension is applied along the second direction between the pair of the first frame rods. In a state where the first peripheral edge portion fixed to the pair of the first frame chairs and the tension for pulling the second frame chair side is applied, the second frame portion of the second frame chair is applied. It includes a second peripheral edge portion fixed to the central portion in the direction, and a pair of third peripheral edge portions fixed to both end portions in the second direction in the second frame chair.

By using the upholstery material having such a structure, the load support member for a chair as described above can be formed.

Further, in the upholstery material according to the present invention, in the upholstery material, the second peripheral edge portion may be formed so as to protrude in the first direction from the third peripheral edge portion.

With this configuration, the second peripheral edge portion protruding from the third peripheral edge portion can be easily pulled toward the second frame rod side, and the tension for forming the second portion can be easily pulled. Can be granted.

Further, in the upholstery material according to the present invention, in the upholstery material, both ends of the second peripheral edge portion in the second direction are formed in a concave shape toward the other end portion side in the first direction. You may do so.

With this configuration, when the second peripheral edge portion is pulled toward the second frame rod side to apply tension, the tension is less likely to reach the third peripheral edge portions on both sides of the second peripheral edge portion. ..

The method for assembling the load support member for a chair according to the present invention is the method for assembling the load support member for a chair as described above, and follows the second direction between the pair of the first frame rods. The step of fixing the first portion of the tension material in a state where tension is applied, and the second portion of the tension material in a state where tension in a pulling direction is applied to the second frame chair side. A step of fixing the second frame chair to the central portion in the second direction and a step of fixing the third portion of the tension material to both ends of the second frame chair in the second direction. And.

With such a configuration, the load supporting member for a chair as described above can be easily and surely manufactured.

According to the method for assembling the chair load support member, the chair, the upholstery material, and the chair load support member according to the present invention, the degree of freedom in the shape of the load support surface of the chair load support member such as the backrest is increased, and the three-dimensional structure is increased. It is possible to easily form a load-bearing surface having a specific shape.

It is a perspective view which looked at the chair which concerns on one Embodiment of this invention from an oblique front. It is a perspective view which looked at the chair from the diagonal rear. It is a side view of the above chair seen from the left. It is a perspective development view which shows the structure of the backrest part of the chair. It is a perspective view which shows the back frame which comprises the said backrest part. It is a plan sectional view which shows the structure of the lower rod of the backrest part. It is a grid diagram which shows the shape of the load bearing surface formed by the tension material of the backrest part. It is a side sectional view of the central portion in the left-right direction of the backrest portion. It is a figure which shows the shape of the tension material in the state before mounting the tension material on a back frame.

Hereinafter, a mode for carrying out the method for assembling the chair load support member, the chair, the upholstery material, and the chair load support member according to the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to this embodiment.
In the following explanation, the direction in which the person sitting in a normal posture with his / her back facing the back of the chair is referred to as "front", and the direction opposite to that is referred to as "rear". .. In addition, the direction in which the person sitting in the chair in the normal posture faces upward is called "up", the direction opposite to it is called "down", and the left side of the person sitting in the chair 1 in the normal posture is called "left" and right. The one is called "right".

FIG. 1 is a perspective view of a chair according to an embodiment of the present invention as viewed diagonally from the front. FIG. 2 is a perspective view of the chair viewed from diagonally rearward. FIG. 3 is a side view of the chair as viewed from the left. FIG. 4 is a perspective development view showing the configuration of the backrest portion of the chair. FIG. 5 is a perspective view showing a back frame constituting the backrest portion. FIG. 6 is a plan sectional view showing the configuration of the lower rod of the backrest portion. FIG. 7 is a grid diagram showing the shape of the load-bearing surface formed by the upholstery material of the backrest portion. FIG. 8 is a side sectional view of the center portion in the left-right direction of the backrest portion. FIG. 9 is a diagram showing the shape of the tension material in a state before the tension material is attached to the back frame.

As shown in FIGS. 1 to 3, the chair 1 of this embodiment is seated on a leg portion 2 mounted on the floor surface F, a box-shaped support base 3 installed on the upper end of the leg portion 2, and a seat. The seat body 4 on which the person sits, the seat receiving member 5 attached to the upper surface of the support base 3 to support the seat body 4, and the back of the seated person seated on the seat body 4 extending upward from the support base 3 to the rear. It is provided with a backrest portion 6 that supports the above.

The leg 2 includes a multi-leg 7 with casters 7a and a pedestal 8 that stands up from the center of the multi-leg 7 and incorporates a gas spring as an elevating mechanism.

The support base 3 is rotatably attached to the upper end of the pedestal 8 in the horizontal direction. The support base 3 has a built-in elevating adjustment mechanism for the pedestal 8 and a tilt adjusting mechanism for the backrest portion 6.

The seat body 4 includes a substrate 13 forming a skeleton portion, a cushion material 14 made of urethane or the like attached to the upper part of the substrate 13, and a tension material 15 that hangs from the outer surface of the cushion material 14 to the outer peripheral edge portion of the substrate 13. And have.

The substrate 13 is made of an elastic synthetic resin, and has a substantially rectangular shape with rounded four corners when viewed from above. The substrate 13 is slidably held back and forth by a seat receiving member 5 fixed on the support base 3.

The backrest portion 6 supports the load from the back of the seated person seated on the seat body 4. The backrest portion 6 has a back frame (frame material) 60 and a tension material 65 stretched on the back frame 60. The front surface of the upholstery member 65 is a load supporting surface 65f that receives the load of the seated person.

The base portion 61 of the back frame 60 is connected to the tilt adjusting mechanism in the support base 3. The support base 3 is provided with an operation knob 12, and by operating the operation knob 12, the reaction force when the back frame is tilted in the front-rear direction can be adjusted.

As shown in FIGS. 1 to 5, the back frame 60 includes a pair of vertical rods (first frame rod) 62, an upper rod 63, and a lower rod (second frame rod) 64. .. The vertical rod 62, the upper rod 63, and the lower rod 64 are continuously formed in an annular shape by, for example, a resin or an aluminum alloy.

The pair of vertical rods 62 extend in the vertical direction along the load supporting surface 65f of the tension member 65, and are provided apart from each other in the horizontal direction. The vertical rod 62 is located in the middle portion between the upper end portion (the other end portion) 62a and the lower end portion (one end portion) 62b, and is opposite to the load input direction P (see FIG. 3) of the tension member 65 on the load support surface 65f. It has a protruding portion 67 that protrudes forward on the side.

The upper rod 63 extends in the left-right direction and connects the upper end portions 62a of the pair of vertical rods 62 to each other. The upper rod 63 is formed so that the central portion 63b in the left-right direction projects rearward in the load input direction P with respect to the load support surface 65f with respect to both end portions 63a and 63a in the left-right direction.

The lower rod 64 is provided so as to be separated from the upper rod 63 in the vertical direction, and connects the lower end portions 62b of the pair of vertical rods 62 to each other. The lower rod 64 is formed so that the central portion 64b in the left-right direction projects rearward in the load input direction P with respect to the load support surface 65f with respect to both end portions 64a and 64a in the left-right direction.

Here, as shown in FIG. 6, the lower rod 64 faces forward and is provided with a linear portion 64p and a diagonal portion 64s on the side on which the tension member 65 is stretched. The linear portion 64p is formed in the central portion 64b of the lower rod 64 in the left-right direction and extends along the left-right direction. The oblique portion 64s is formed continuously on both sides in the left-right direction with respect to the linear portion 64p. These oblique portions 64s and 64s are formed so as to be inclined forward in the direction opposite to the load input direction P and extend linearly from both ends of the linear portion 64p toward both end portions 64a and 64a on the outer side in the left-right direction. ing. Further, in the lower rod 64, a corner portion 64t that is convex rearward (opposite to the seated person in the third direction) is formed between the linear portion 64p and the oblique portion 64s, respectively.
In such a lower rod 64, the rearward protrusion dimension S1 of the linear portion 64p of the central portion 64b with respect to both end portions 64a and 64a is rearward of the central portion 63b with respect to both end portions 63a and 63a of the upper rod 63. It is formed so as to be larger than the protruding dimension S2 (see FIG. 3).

Grooves 66 recessed inward of the backrest portion 6 are continuously formed in the circumferential direction on the outer peripheral edges of the pair of vertical rods 62 and 62 of the back frame 60 and the upper rod 63. ..

The upholstery material 65 has a mesh shape in which a large number of holes are formed, and its outer peripheral end portion 65e is caught in grooves 66 and 66 m (see FIG. 8) formed in the back frame 60 and fixed by the edge material 68. ing.

As shown in FIGS. 1 and 7, the upholstery material 65 includes a first portion A1, an upper rod fixing portion A2, a second portion A3, and a third portion A4 and A4.
The first portion A1 of the upholstery material 65 is fixed between the pair of vertical rods 62, 62 in a state where tension T1 along the left-right direction is applied.
As shown in FIGS. 1 and 8, the upper rod fixing portion A2 of the upholstery member 65 is fixed to the upper rod 63 above the first portion A1.
The second portion A3 of the upholstery material 65 is fixed in a state where a tension T2 for pulling toward the linear portion 64p formed in the central portion 64b in the left-right direction of the lower rod 64 is applied. Here, it is preferable that the second portion A3 is given a higher tension than the first portion A1 and the third portion A4.
The third portions A4 and A4 of the upholstery material 65 are formed on both sides of the second portion A3 in the left-right direction, and are formed on the diagonal portions 64s and 64s formed at both ends 64a and 64a in the left-right direction of the lower rod 64. It is fixed without applying any particular tension.

Here, the second portion A3 is fixed to the linear portion 64p of the lower rod 64 in a state of being strongly pulled in the direction of the lower rod 64. In this embodiment, as shown in FIG. 6, the second portion A3 is fixed over the entire length between both ends of the linear portion 64p of the lower rod 64.
Further, in the lower rod 64, the tension member 65 is fixed along the linear portions 64p, the oblique portions 64s and 64s, and the corner portions 64t and 64t on both left and right sides of the linear portion 64p. .. Specifically, as shown in FIG. 8, the lower rod 64 is provided with a fixing member 69 along the front surface thereof. The fixing member 69 includes a base portion 69a fixed to a recess 64u formed on the front surface of the lower rod 64 and an extending portion 69b extending downward with a space between the front surface of the lower rod 64 in the front-rear direction. It has. The upholstery member 65 is wound around the downward groove 66m formed between the front surface of the lower rod 64 and the extending portion 69b of the fixing member 69 and fixed by the edge member 68 (see FIG. 4).

With this configuration, the tension T1 along the left-right direction acts on the first portion A1 which is a region on the upper rod 63 side of the protruding portion 67 of the vertical rod 62. The tension T1 in the left-right direction applied to the tension member 65 acts to linearly connect the protruding portions 67 of the pair of vertical rods 62 to each other. By providing the vertical rod 62 with the protruding portion 67 in this way, the tension T1 along the left-right direction is less likely to act on the lower rod 64 side than the protruding portion 67 of the vertical rod 62.

On the other hand, in the second portion A3 formed in the region on the lower rod 64 side of the protruding portion 67 of the vertical rod 62, as shown in FIG. 8, the tension member 65 is formed on the linear portion 64p of the lower rod 64. By pulling toward, a tension T2 including a downwardly pointing component Td and a component Tp in the load input direction P is applied. As shown in FIG. 1, the tension T2 is a straight line between the linear portion 64p (see FIG. 6) at the center of the lower rod 64 in the left-right direction and the protruding portions 67 of the pair of vertical rods 62 in the tension member 65. It acts intensively on the substantially trapezoidal region D connected in a shape. Therefore, in the second portion A3, the load supporting surface 65f of the upholstery member 65 is recessed rearward.
Further, by fixing the upholstery material 65 at at least two corners 64t and 64t at both ends of the linear portion 64p of the lower rod 64, the upholstery member 65 can be attached to the upholstery member 65 from both left and right ends of the linear portion 64p. A ridge line L is formed which extends upward (on the other end side of the first frame rod in the first direction) so as to gradually expand toward the protruding portions 67, 67 of the vertical rod 62. Here, in the tension material 65, tension is not applied to the third portion A4, and tension T1 in the left-right direction does not act on the lower portion of the tension material 65. As a result, in the lower part of the upholstery material 65, the second portion A3 and the third portion A4 are less likely to be lifted from the lower rod 64. Therefore, the depression at the second site A3 becomes more visually prominent.

In order to assemble the backrest portion 6 as described above, first, the first portion A1 of the tension member 65 is fixed between the pair of vertical rods 62 with the tension T1 along the left-right direction applied. At the same time, the upper rod fixing portion A2 is fixed to the upper rod 63.
Next, the second portion A3 is fixed to the linear portion 64p of the lower rod 64 in a state where the tension T2 for pulling to the lower rod 64 side is applied to the central portion of the tension member 65 in the left-right direction.
After that, the upholstery material 65 is fixed to the diagonal portions 64s and 64s on both sides of the lower rod 64 in the left-right direction, respectively, with the pair of third portions A4.
With this configuration, the backrest portion 6 as described above can be assembled.

By the way, as shown in FIG. 9, the upholstery member 65 constituting the backrest portion 6 has a shape that conforms to the outer shape of the back frame 60 as a whole without being stretched on the back frame 60. That is, the tension member 65 has the first peripheral edges 65a and 65a fixed to the pair of vertical rods 62 in a state where the tension T1 along the left-right direction is applied between the pair of vertical rods 62, and the upper rod. A second peripheral edge portion 65c fixed to the linear portion 64p in the central portion in the left-right direction of the lower rod 64 in a state where the upper edge portion 65b fixed to the 63 and the tension T2 for pulling to the lower rod 64 side are applied. And a pair of third peripheral edge portions 65d and 65d fixed to the oblique portions 64s and 64s at both ends in the left-right direction in the lower rod 64.

Here, the second peripheral edge portion 65c is formed with band-shaped portions 65x protruding downward from the third peripheral edge portions 65d and 65d on both left and right sides thereof. When the tension member 65 is attached to the back frame 60 by the method of assembling the backrest portion 6 as described above, the second peripheral edge portion 65c is placed on the lower rod in a state where the strip-shaped portion 65x is pulled downward to apply tension T2. It is fixed to the linear portion 64p of 64.
Further, the root portions 65n and 65n on both sides of the strip-shaped portion 65x in the left-right direction are concave upward. As a result, when the tension T2 is applied to the strip-shaped portion 65x, the tension T2 is less likely to reach the third peripheral edges 65d and 65d (third portions A4 and A4) on both sides in the left-right direction.
Further, the third peripheral edges 65d and 65d are formed in a curved shape that is convex downward. The second peripheral edge portion 65c is strongly pulled downward to fix it to the lower rod 64, while the third peripheral edge portions 65d and 65d are not pulled strongly and the grooves 66 of the oblique portions 64s and 64s of the lower rod 64. The third part A4 does not generate tension by being caught in the rod.

As described above, in the first portion A1 between the pair of vertical rods 62, tension T1 is applied along the left-right direction in which the pair of vertical rods 62 face each other, and the lower rod is applied to the central portion in the left-right direction. A tension T2 for pulling toward the lower rod 64 was applied to the second portion A3 fixed to 64. With such a configuration, the load-bearing surface 65f formed by the upholstery 65 is left and right of the load-bearing surface 65f by the second portion A3, as compared with the case where the outer peripheral portion of the upholstery 65 is simply fixed to the back frame 60. The central part of the direction is recessed rearward. In this way, the load supporting surface 65f can have a more three-dimensional shape. Moreover, since the tension member 65 may be fixed to the back frame 60 while the tensions T1 and T2 are sequentially applied, the assembling work of the backrest portion 6 can be easily performed.
Further, by applying the tension T2 that pulls the lower rod 64 side to the second portion A3, the load supporting surface 65f has a shape in which the central portion in the left-right direction is recessed rearward, so that the load supporting surface 65f is the user. It has a shape with excellent holdability on the back.
Further, the second site A3 is provided with a higher tension than the first site A1 and the second site A3. With this configuration, the upholstery material 65 is further recessed in the second portion A3.
As a result, the degree of freedom in the shape of the load supporting surface 65f of the backrest portion 6 is increased, and the load supporting surface having a three-dimensional shape can be easily formed.

Further, in the second portion A3 of the tension member 65, by fixing the lower rod 64 at two or more points spaced apart from each other in the left-right direction, the tension member 65 is pulled toward the lower rod 64 side provided to the second portion A3. The tension T2 acts clearly linearly from the point where the tension member 65 is fixed to the lower rod 64 toward the upper rod 63 side. As a result, a visible ridge line L can be formed on the upholstery material 65, and the dent in the second portion A3 becomes more visually prominent.

Further, the vertical rod 62 has a protruding portion 67 projecting forward on the side opposite to the load input direction P in the intermediate portion between the upper end portion 62a and the lower end portion 62b, and the first portion A1 of the tension member 65. Is formed in a region of the vertical rod 62 on the upper end portion 62a side of the protruding portion 67. With this configuration, the tension T1 along the left-right direction acts on the first portion A1 on the upper rod 63 side of the protruding portion 67 of the vertical rod 62, while the tension T1 is applied to the protruding portion 67 of the vertical rod 62. The tension T1 along the left-right direction is less likely to act on the lower rod 64 side. By providing the vertical rod 62 with the protruding portion 67 in this way, it is possible to clearly form a region on which the tension T1 acts along the left-right direction.
Further, the tension T1 in the left-right direction applied to the tension member 65 acts so as to linearly connect the protruding portions 67 of the pair of vertical rods 62 to each other. On the other hand, when the tension T2 for pulling toward the lower rod 64 is applied to the tension member 65 at the second portion A3, the applied tension T2 is the linear portion 64p of the lower rod 64 and the pair of vertical rods 62. It acts intensively on the trapezoidal region D connecting the protruding portions 67 to each other. Therefore, the load supporting surface 65f formed by the tension member 65 is effectively recessed at the second portion A3 located in the region connecting the lower rod 64 and the protruding portions 67 of the pair of vertical rods 62.

Further, in the lower rod 64, the rearward protrusion dimension S1 of the central portion 64b with respect to both end portions 64a and 64a is larger than the rearward protrusion dimension S2 of the central portion 63b with respect to both end portions 63a and 63a of the upper rod 63. It is formed. With this configuration, the tension T2 applied to the second portion A3 causes the second portion A3 of the upholstery material 65 to be more effectively recessed rearward.

Further, the lower rod 64 integrally includes a linear portion 64p and oblique portions 64s and 64s formed continuously on both sides in the left-right direction with respect to the linear portion 64p. With this configuration, the second portion A3 of the upholstery material 65 can be efficiently formed into a shape recessed rearward.

Further, the tension member 65 constituting the backrest portion 6 is not stretched on the back frame 60, and a pair of vertical rods is provided with a tension T1 along the left-right direction between the pair of vertical rods 62. The first peripheral portions 65a and 65a fixed to 62 and the second peripheral portion 64p fixed to the linear portion 64p in the central portion in the left-right direction of the lower rod 64 in a state where the tension T2 for pulling to the lower rod 64 side is applied. A pair of third peripheral edges 65d and 65d fixed to the oblique portions 64s and 64s at both ends in the left-right direction of the lower rod 64.
By fixing the first peripheral edge portions 65a and 65a, the second peripheral edge portions 65c, and the third peripheral edge portions 65d and 65d of the tension member 65 to the pair of vertical rods 62 and 62 and the lower rod 64, respectively. , The backrest portion 6 having the three-dimensional load supporting surface 65f as described above can be formed.

Further, the tension member 65 protrudes vertically from the third peripheral edges 65d and 65d on the second peripheral edge 65c forming the second portion A3 by fixing to the linear portion 64p of the lower rod 64. A strip-shaped portion 65x is formed. With this configuration, the second peripheral edge portion 65c is fixed to the linear portion 64p of the lower rod 64 in a state where the strip-shaped portion 65x is pulled downward to apply the tension T2, so that the second portion A3 The tension T2 can be efficiently applied to the rod.

Further, in the upholstery material 65, at the second peripheral edge portion 65c, the root portions 65n and 65n on both sides of the strip-shaped portion 65x in the left-right direction are concave upward. As a result, when the tension T2 is applied to the strip-shaped portion 65x, the tension T2 is less likely to be applied to the third peripheral edges 65d and 65d (third portions A4 and A4) on both sides in the left-right direction.

Further, the method of assembling the backrest portion 6 as described above is a step of fixing the first portion A1 of the tension member 65 in a state where tension T1 along the left-right direction is applied between the pair of vertical rods 62. A step of fixing the second portion A3 to the lower rod 64 with a tension T2 pulling toward the lower rod 64 applied to the central portion in the left-right direction, and a pair of first ends of the lower rod 64 in the left-right direction. It includes a step of fixing the three parts A4.
With this configuration, the backrest portion 6 can be easily and surely manufactured.

(Other embodiments)
The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist thereof. For example, the above embodiment is an embodiment in which the load support is a backrest portion, but a similar structure can be adopted for the seat body.
Further, for example, the tension member 65 acts on the second peripheral portion A3 because there is a difference in the vertical direction (first direction) between the second peripheral edge portion 65c and the third peripheral edge portions 65d and 65d. Any shape may be used as long as the applied tension T2 does not reach the third portions A4 and A4. For example, the third peripheral edges 65d and 65d may protrude significantly downward from the second peripheral edge 65c, and the second peripheral edge 65c may project downward from the third peripheral edges 65d and 65d. You may do so.
Further, the second peripheral portion 65c of the tension member 65 is fixed over the entire length between both ends of the linear portion 64p of the lower rod 64 to form the second portion A3, but the ridge line L is formed. If this is possible, the second portion A3 may be fixed to the lower rod 64 at two or more points spaced apart from each other in the left-right direction.
Further, for example, the lower rod 64 is integrally provided with a linear portion 64p and oblique portions 64s and 64s formed continuously on both sides in the left-right direction with respect to the linear portion 64p. Not limited to this. For example, either the linear portion 64p or the oblique portion 64s of the lower rod 64 may be curved in a third direction so as to be convex toward the side opposite to the seated person. Further, the lower rod 64 has a curved shape that is convex toward the side opposite to the seated person in the third direction, and the central portion in the second direction and both ends in the second direction with respect to the central portion. , The curvature of the curved shape may be different.
Further, in order to fix the upholstery material 65 along the linear portions 64p of the lower rod 64, the oblique portions 64s and 64s, and the corner portions 64t and 64t on both left and right sides of the linear portion 64p, the upholstery material is used. The 65 may be wound into the groove 66 and fixed by the edge member 68, or may be fixed by a holding member pressed from the front, or may be fixed by a tacker or the like.
Further, in the above embodiment, the upholstery material 65 is fixed to the upper rod 63, but the upholstery material 65 may not be fixed to the upper rod 63.
Further, the back frame 60 may be configured not to include the upper rod 63 but to include only a pair of vertical rods 62 and 62 and a lower rod 64.

1 Chair 2 Legs 4 Seat 6 Backrest 60 Back frame (frame material)
62 Vertical rod (first frame rod)
62a Upper end (the other end)
62b Lower end (one end)
63 Upper rod 63a End part 63b Central part 64 Lower rod (second frame rod)
64a End part 64b Central part 64p Straight part 64s Oblique part 64t Square part 65 Tension material 65a First peripheral part 65b Upper edge part 65c Second peripheral part 65d Third peripheral part 65e Outer peripheral end part 65f Load-bearing surface 65x strip 67 projecting part A1 first part A2 upper rod fixing part A3 second part A4 third part D area F floor surface L ridge line P load input direction S1, S2 protruding dimension T1 lateral tension T2 lower rod Tension to pull to the side

Claims (7)

A tension material that forms a load-bearing surface that receives the load of the seated person,
A frame material that supports the outer peripheral end of the upholstery material and
With
The frame material is
A pair of first frame rods extending in the first direction along the load-bearing surface of the upholstery material and spaced apart from each other in the second direction intersecting the first direction.
A pair of second frame rods for connecting one ends of the first frame rods are provided.
The first frame rod has a protruding portion protruding in a direction opposite to the load input direction with respect to the load supporting surface at an intermediate portion between the one end portion and the other end portion of the first frame rod.
The upholstery is
Between the pair of the first frame rods, a first portion fixed in a state where tension is applied along the second direction, and
The second direction of the second frame rod in a state of being formed in the region on the one end side side in the first direction with respect to the protruding portion and the tension for pulling the second frame rod side is applied. The second part fixed in the center of the
In the second frame rod, a pair of third portions fixed to both ends in the second direction are provided.
The first portion of the upholstery material is formed in a region on the other end side in the first direction with respect to the protruding portion.
The second portion is a load support member for a chair to which a higher tension is applied in a pulling direction toward the second frame rod side than the first portion and the third portion. The load support member for a chair according to claim 1, wherein the second portion is fixed to the second frame rod at two or more points spaced apart from each other in the second direction. The legs installed on the floor and
The seat body supported by the legs and
A backrest made of the load-bearing member for a chair according to claim 1 or 2, which is supported by the legs.
Chair with. A tension material used for the load supporting member for a chair according to claim 1 or 2.
Between the pair of the first frame rods, a first peripheral edge portion fixed to the pair of the first frame rods in a state where tension is applied along the second direction, and
A second peripheral edge portion fixed to the central portion of the second frame rod in the second direction in a state where a pulling tension is applied to the second frame rod side, and
In the second frame rod, a pair of third peripheral edges fixed to both ends in the second direction, and
Upholstery material with. The upholstery material according to claim 4, wherein the second peripheral edge portion is formed so as to project in the first direction from the third peripheral edge portion. The upholstery material according to claim 5, wherein both ends of the second peripheral edge portion in the second direction are formed in a concave shape toward the other end portion side in the first direction. The method for assembling a load support member for a chair according to claim 1 or 2.
A step of fixing the first portion of the upholstery material in a state where tension is applied along the second direction between the pair of the first frame rods.
A step of fixing the second portion of the tension material to the central portion of the second frame rod in the second direction while applying tension in the pulling direction to the second frame rod side.
A step of fixing the third portion of the upholstery material to both ends of the second frame rod in the second direction, and
A method of assembling a load-bearing member for a chair.

Images