JP2010104460A - Backrest of chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide sitting comfort by preventing a repulsive force of a tension material from being extremely varied on the way when a seated person leans on a backrest, and sufficiently securing the backward-sunk amount of the backrest with respect to a load of the tension material. <P>SOLUTION: This backrest of a chair is formed by coveringly fitting and tensioning a bag-shaped tension material 26 whose lower end is opened, to a frame-like back frame 22, which is formed by connecting the upper ends and lower ends of a pair of right/left vertical side frames 18 and 18, to each other by upper and lower horizontal frames 19 and 20 respectively. In this backrest, intermediate portions in the horizontal direction of the upper frame 19 and lower frame 20 are connected to each other by a vertical intermediate frame 21, which is located rearward both the side frames 18 and 18, so as to backward swell the intermediate portion of a rear face 19b of the tension material 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a backrest of a chair.

A conventional backrest of a chair includes a frame-like back frame fitted with a bag-like upholstery material having an open lower end (see, for example, Patent Document 1).
European Patent Application No. 0922419

  In what is described in Patent Document 1, since the front part and the rear part of the upholstery material placed on the back frame are close to each other, when the seated person falls into the backrest, After only the front part bends backward and then the front part of the upholstery comes into contact with the rear part, both of them are bent backwards and receive a load on the seated person's back, which is against the seated person's back. The power changes in two stages, at the initial stage when the back is drowned and after that, giving a sense of incongruity to the seated person.

  In addition, in order to obtain a comfortable seating feeling when the seated person is drowning in the backrest, it is necessary to increase the amount of recess in the back with respect to the load of the backrest tension material. In those other than the initial stage when drowning in the backrest, both the front surface portion and the rear surface portion of the upholstery material bend together, and the repulsive force becomes large. Big and difficult.

  In view of the above-mentioned problems of the prior art, the present invention does not cause the repulsive force of the upholstery material to fluctuate in the middle when the seated person is drowning in the backrest, and the backrest tension. An object of the present invention is to provide a backrest of a chair that can ensure a comfortable seating feeling by ensuring a sufficient amount of rearward indentation with respect to the load of the material.

According to the present invention, the above problem is solved as follows.
(1) The lower end opens in a frame-like back frame formed by connecting the upper and lower ends of a pair of left and right side frames facing in the vertical direction with an upper frame and a lower frame facing in the left-right direction. In the back of a chair with a bag-like upholstery,
By connecting the middle portions in the left and right direction of the upper frame and the lower frame with an intermediate frame facing the vertical direction located behind the both side frames, the middle portion of the rear surface portion of the upholstery material bulges backward. Let

  With such a configuration, when the seated person falls in the back, the front part of the upholstery material does not come into contact with the rear surface part, and the resistance of the upholstery material does not fluctuate extremely during the process, As the front part of the upholstery material stretches, the rear surface part also stretches, and the stretched part of the rear surface part increases the proportion of recesses in the rear of the front part, thereby obtaining a comfortable seating feeling. be able to.

  (2) In the above item (1), the upper frame and the lower frame have a curved shape in which the intermediate portion is located behind the both side portions in plan view.

  With such a configuration, the intermediate frame can be separated farther rearward than both side frames, so that the effect of the above item (1) can be further enhanced and the thickness of the backrest in the front-rear direction is increased. And can give a high-class feeling to the backrest.

  (3) In the above item (1) or (2), the lower portions of the both side frames and the intermediate frame are formed in an arcuate curved shape with the center of curvature positioned forward in a side view.

  With such a configuration, the side shape of the backrest can be made to follow the side shape of the seated person's buttocks, and the waist can be reliably supported from the seated person's buttocks.

  (4) In any one of the above items (1) to (3), the rearward displacement amount of the intermediate frame with respect to both side frames is partially varied in the vertical direction.

With such a configuration, the tension and tension of the upholstery when attached to the back frame is partially changed in the vertical direction without partially changing the material and shape of the bag-like upholstery in the vertical direction. be able to.
Therefore, by increasing or decreasing the amount of displacement of the desired height of the backrest as required, the tension of the tension material at that portion is increased or decreased. Can do.

  (5) In any one of the above items (1) to (4), when the intermediate frame is formed of an elastic material and a load is applied to the front surface portion of the upholstery material, the intermediate frame can be elastically deformed forward. To.

  With such a configuration, the elasticity of the intermediate frame compensates for the tension of the tension material, and the synergistic action thereof can further increase the ratio of the recesses in the rear of the front surface portion of the tension material.

  (6) In any one of the above items (1) to (5), at the upper ends of both side frames of the back frame, the extension that curves upward so that the middle portion is positioned forward of the upper and lower portions in a side view. Frames are connected in series, and the upper ends of both extension frames are connected by a top frame that faces in the left-right direction, and a headrest frame is formed by the extension frame and the top frame.

  With such a configuration, a headrest having a characteristic shape can be easily formed integrally with the back frame.

  According to the present invention, when the seated person falls back, the repulsive force of the upholstery material does not fluctuate extremely in the middle, and the backward indentation amount with respect to the load of the backrest upholstery is sufficient. It is possible to provide a backrest of a chair that can be secured to obtain a comfortable seating feeling.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
1-3 show a chair comprising one embodiment of the backrest of the present invention.
This chair includes a lower structural body 4 in which a pedestal 2 is erected at the center of a base 1 of a disk, and a support base 3 is fixed to the upper end of the pedestal 2.

The pedestal 2 may be adjustable in height by a gas spring (not shown).
The support base 3 has a shape that expands in a substantially triangular shape from the upper end of the pedestal 2 toward the front in a plan view and a side view.

  A front lower portion of the seat 5 is pivotally attached to the front end portion of the support base 3 with a base shaft 6 in the left-right direction, and the seat 5 is, as shown in FIG. As shown in FIG. 3, it can be rotated about the base shaft 6 to a use position that is horizontal or slightly inclined downward in the rearward direction.

A pair of left and right armrests 7 and 7 are integrally formed on the seat 5 at the rear portions on both sides of the seat 5.
Each armrest 7 stands from both sides of the rear portion of the seat 5 and has a backrest pivot support portion 7a protruding from a curved surface 8 having a semicircular arc shape or a fan shape as viewed from the side centering on a support shaft 11 of the backrest 9 described later. And an upward arc-shaped elbow rest 7b extending forward from the upper portion of the backrest pivot 7a, and the overall shape is substantially a forward triangle in a side view that converges toward the front upper side. .

The front and rear dimensions of the elbow rest 7b are set so that the front end of the elbow rest 7b is positioned in front of the vertical line V passing through the center of the base shaft 6 that is the pivotally mounted portion of the seat 5 in the standby position shown in FIG. Has been.
Further, as shown in FIG. 2, when the seat 5 is in the use position, the front end portion of the elbow rest 7b is located behind the vertical line V, that is, slightly behind the base shaft 6 on which the seat 5 is pivotally attached. It is supposed to be located at.

  The front end of the forward side piece 10 extending forward from the lower part of both sides of the backrest 9 is supported on the outer surface of the backrest pivot support portion 7a of the left and right armrests 7 and 7 slightly forward. The backrest 9 is pivotally attached to the shaft 11 so that the backrest 9 can rotate with respect to the seat 5 and the armrest 7 around the support shaft 11 between the standing position shown in FIG. 2 and the rearward tilt position shown in FIG. It has become. In addition, the outer side surface of the backrest pivot support portion 7a is bulged outward so that the pivoting portion of the front side piece 10 is located on the outermost side, and the inner surface of the front side piece 10 is backrested. The outer surface of the pivotal support portion 7a is not contacted over a wide range.

  A portion of the lower part of the backrest 9 opposite to the rear surface of the backrest pivot portion 7a is an arcuate concave curved surface 12 that is substantially complementary to the curved surface 8 of the rear surface of the backrest pivot portion 7a. So that the backrest 9 can move around the support shaft 11. Between the center part in the left-right direction of the lower frame 20 to be described later in the backrest 9 and the upper surface of the front end portion of the support base 3, a gas spring or a compression spring that urges the backrest 9 in the standing direction is provided. One urging means 13 is provided.

Further, in the support base 3, there is provided second urging means 14 that can assist the seated person to stand by urging the seat 5 toward the standby position.
The second urging means 14 includes, for example, a rubber torsion unit 15 whose axis is directed in the left-right direction, and a first that is linked to the rubber torsion unit 15 and is urged counterclockwise in a side view in FIG. A lower end portion is pivotally attached to the link 16 and the distal end portion of the first link 16 with a left and right axis, and an upper end portion is pivotally attached to a lower surface of an intermediate portion in the front and rear direction of the seat 5 with a left and right axis. And a second link 17 facing diagonally upward.

  Since the armrest 7 is formed integrally with the seat 5, even if the seat 5 rotates between the standby position and the use position or the backrest 9 tilts, the relative position of the armrest 7 with respect to the seat 5. Is not changed, and the elbow can be hung on the armrest 7 in a natural state from the standby position to the use position, and the usability of the chair is improved.

  When the seat 5 is in the standby position, the front end portion of the armrest 7b of the armrest 7 is positioned forward of the vertical line V passing through the center of the base shaft 6 that is pivotally attached to the seat 5. Therefore, at the standby position, when the user sits on the front end of the elbow rest 7b, the seat 5 does not have a risk of rotating downward due to the load, and can be seated with peace of mind.

  Further, the front end portion of the forward side piece 10 extending forward from the lower portions of both sides of the backrest 9 is pivotally attached to the backrest pivot portion 7a standing up from both rear side portions of the seat 5, and the backrest pivot portion 7a Since the surface facing the lower part of the backrest 9 is an arc-shaped or fan-shaped curved surface 8 and an arc-shaped concave curved surface 12 centering on the support shaft 11, the backrest 9 interferes with the seat 5 and the armrest 7. And can be tilted backwards greatly. Moreover, since the lower part of the backrest 9 can be firmly pivotally attached to the backrest pivot support portion 7a of the armrest 7 that is integral with the seat 5, even if the backrest 9 has a large vertical dimension, it can be stably and smoothly. It can be supported so that it can rotate.

  As shown in FIG. 4, the backrest 9 is formed by connecting the upper ends of a pair of left and right side frames 18, 18 facing in the up-down direction with an upper frame 19 facing in the left-right direction, and of the side frames 18, 18. The lower ends are connected to each other by a lower frame 20 that faces in the left-right direction, and the intermediate portions in the left-right direction of the upper frame 19 and the lower frame 20 are positioned at the rear side of the side frames 18, 18. A back frame 22 is formed by connecting with 21 and has a front rectangular frame shape.

  The back frame 22 is integrally formed of a synthetic resin material having moderate elasticity. It is preferable to add reinforcing fibers such as glass fibers and carbon fibers to the synthetic resin material.

  The lower portions of the side frames 18 and 18 and the lower portion of the intermediate frame 21 have an arcuate curved shape in which the center of curvature is located forward in a side view, and the upper frame 19 and the lower frame 20 are in a plan view. The intermediate portion is in a curved shape located behind the both side portions. Thereby, the lower part of the backrest 9 is separated rearward from the rear ends of the seat 5 and the armrest 7, and when the backrest 9 rotates, it is prevented from interfering with the rear ends of the seat 5 and the armrest 7. The range of rotation of the drooping 9 to the rear can be increased.

  It is preferable that the curvature centers of the curved shapes of the lower portions of the side frames 18 and 18 and the lower portion of the intermediate frame 21 coincide with the support shaft 11 of the backrest 9.

  The intermediate frame 21 is formed to be thinner than the other frame components in the back frame 22 so as to be more easily elastically deformed than the other portions. When a load is applied to the front surface portion of the tension member 26 described later, the intermediate frame 21 21 can be elastically deformed forward.

  The rearward displacement amount of the intermediate frame 21 with respect to the both side frames 18 and 18 is increased toward the lower side.

  The left and right forward side pieces 10 described above are formed integrally with the lower portions of the side frames 18 and 18.

  At the upper end of the back frame 22, extension frames 23, 23 are connected to the upper ends of the side frames 18, 18 so as to face upward and bend so that the intermediate portion is positioned forward of the upper and lower portions in a side view. A headrest frame 25 formed by connecting the upper ends of the extension frames 23 and 23 with a top frame 24 facing in the left-right direction is integrally provided.

  As shown in FIG. 4, the back frame 22 and the headrest frame 25 are stretched by being fitted with a stretchable bag-like upholstery material 26 whose lower ends and lower portions on both sides are open.

  The upholstery material 26 includes a headrest cover portion 27 that covers the headrest frame 25 and a backrest cover portion 28 that covers the back frame 22, and the tension fabrics are different from each other. Further, the tension of the front surface portion 27a and the rear surface portion 27b in the headrest cover portion 27 and the tension of the front surface portion 28a and the rear surface portion 28b of the backrest cover portion 28 are also different from each other.

  Both the headrest covering portion 27 and the backrest covering portion 28 are made of mesh material, but the headrest covering portion 27 has at least a front surface portion 27a covering material, and the backrest covering portion 28 has at least a front surface portion 28a covering material. It is formed of a mesh material rich in elasticity.

Further, at least the front surface portion 27a of the headrest cover portion 27 has a low density mesh material with a coarse mesh, and at least the front surface portion 28a of the back cover portion 28 has a fine mesh material with a high density. It is as.
That.

  The mesh material has a weave or knitted direction so that the front surface portion 27a of the headrest cover portion 27 and the front surface portion 28a of the backrest cover portion 28 face in the left-right direction, and the rear surface portion 27b and the backrest cover portion of the headrest cover portion 27. 28, the rear surface portion 28b is directed in the vertical direction, the front surface portions 27a and 28a are expanded and contracted in the horizontal direction, and the rear surface portions 27b and 28b are expanded and contracted in the vertical direction.

Further, as described above, the front surface portion 28a in the back cover portion 28 is a fine mesh material having a fine mesh and having a soft surface or a mesh material with low translucency. The rear surface portion 28b of the curving cover portion 28 is a low-density mesh material with a coarse mesh, and is a stretch of mesh material having high translucency or high transparency.
As the tension of the front surface portion 28a, it is preferable to use a molding fiber in which short fibers are sandwiched between a plurality of elastic yarns.

  Further, the front portion 27a and the rear surface portion 27b in the headrest cover portion 27, and the front portion 28a and the rear surface portion 28b in the backrest cover portion 28 are not only made of materials but also different in color, thereby improving the design. is there.

  The upholstery material 26 is formed not only in a bag-like shape by being fitted on the back frame 22 but is stretched, but also on the front surface portions 27a and 28a and the rear surface portions 27b and 28b of the upholstery material 26 separated from each other in the front-rear direction. Thus, the headrest frame 25 and the back frame 22 may be sandwiched from the front and rear, and the peripheral portions of the front surface portions 27a and 28a and the rear surface portions 27b and 28b may be bound to each other, resulting in a bag shape.

  The lower end portion of the upholstery material 26 projects from the openings at the lower portions on both sides, the left and right forward side pieces 10 and 10 project forward, and the lower end portions of the front surface portion 28a and the rear surface portion 28b are connected to the lower portion of the back frame 22. Below the frame 20, they are attached to the lower end of the lower frame 20 by being connected to each other by hooking fasteners, hooks, fasteners, and other connecting means (all not shown).

  When the headrest is not required, the headrest cover 27 in the headrest frame 25 and the upholstery material 26 may be omitted.

  The backrest 9 having the above-described configuration connects the intermediate portions of the upper frame 19 and the lower frame 20 with an intermediate frame 21 that is located on the rear side of the both side frames 18 and 18 and faces the vertical direction. Since the intermediate portion of the rear surface portion 26b of the upholstery material 26 is bulged rearward by the frame 21, the front surface portion 28a of the upholstery material 26 comes into contact with the rear surface portion 28b when the seated person falls on the backrest 9. And the resistance force of the upholstery material 26 does not fluctuate extremely during the process. Further, as the front surface portion 28a of the upholstery material 26 expands, the rear surface portion 28b also expands, and the extended amount of the rear surface portion 28b increases the amount of recession in the rear of the front surface portion 28a. A comfortable seating feeling can be obtained.

  Further, since the upper frame 19 and the lower frame 20 have a curved shape in which the intermediate portion is located behind the both side portions in plan view, the intermediate frame 21 is spaced farther rearward than the both side frames 18 and 18. Therefore, the above effect can be further enhanced, and the thickness of the backrest 9 in the front-rear direction can be increased to give the backrest 9 a high-class feeling.

  Furthermore, the headrest having a characteristic shape can be easily formed integrally with the back frame 22 by the headrest frame 25 and the headrest cover portion 27 of the bag-like upholstery material 26 fitted thereto.

  The upholstery material 26 has the front surface portions 27a, 28a and the rear surface portions 27b, 28b different from each other as described above, so that even when they are formed of a mesh material, the occurrence of moire patterns is prevented. In addition, an appropriate amount of deflection can be exerted, the surface can be made flexible, and light transmission or transparency is not deteriorated. Further, sufficient air permeability and elasticity can be obtained. Can be obtained.

  In the above embodiment, the rearward displacement amount of the intermediate frame 21 with respect to the side frames 18, 18 is increased as it goes downward, so the material, dimensions, etc. are the same in any part in the vertical direction. The initial tension of the upholstery material 26 at the lower part of the backrest 9 can be made larger than that at the upper part of the backrest 9 simply by fitting the bag-like upholstery material 26 onto the back frame 22. Accordingly, when the seated person falls on the backrest 9, the upholstery material 26 at the top of the backrest 9 on which the upper part of the back hits is weak in tension, and is deeply recessed deeply in the rear, and the lower back and the buttock from the lower part of the back. The upholstery material 26 under the backrest 9 that hits it has a strong tension and can support them strongly, so that a comfortable seating feeling can be obtained for the seated person.

As described above, the amount of the rearward displacement of the intermediate frame 21 with respect to the side frames 18 and 18 is partially different in the vertical direction, so that the material and shape of the bag-like upholstery material 26 are partially changed in the vertical direction. The tension of the upholstery material 26 when it is attached to the back frame 22 can be partially varied in the vertical direction without changing the position.
Therefore, the tension of the tension member 26 in the portion is increased or decreased by increasing or decreasing the amount of displacement of the desired height portion of the backrest as desired. be able to.

  The present invention is not limited to the above-described embodiment, and can be implemented in various modified forms.

It is a side view of the waiting state of a chair provided with one embodiment of the backrest of the present invention. Similarly, it is a side view of a sitting state. Similarly, it is a side view of a reclining state. It is the perspective view which looked at the state before putting a tension material in a back frame from the back diagonally backward.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Pillar 3 Support base 4 Lower structure 5 Seat 6 Base shaft 7 Armrest 7a Backrest pivot support portion 7b Elbow rest portion 8 Curved surface 9 Backrest 10 Forward side piece 11 Support shaft 12 Concave surface 13 First bias Means 14 Second urging means 15 Rubber torsion unit 16 First link 17 Second link 18 Side frame 19 Upper frame 20 Lower frame 21 Intermediate frame 22 Back frame 23 Extension frame 24 Top frame 25 Headrest frame 26 Tension material 27 Headrest Cover part 27a Front part 27b Rear part 28 Backrest part 28a Front part 28b Rear part V Vertical line

Claims (6)

The upper and lower ends of a pair of left and right side frames facing in the vertical direction are connected to each other by an upper frame and a lower frame facing in the left-right direction. In the backrest of a chair with upholstery,
By connecting the middle portions in the left and right direction of the upper frame and the lower frame with an intermediate frame facing the vertical direction located behind the both side frames, the middle portion of the rear surface portion of the upholstery material bulges backward. The back of the chair, characterized by   The backrest of the chair according to claim 1, wherein the upper frame and the lower frame have a curved shape in which the intermediate portion is located rearward of both side portions in plan view.   The backrest of the chair according to claim 1 or 2, wherein the lower portions of the both side frames and the intermediate frame have an arcuate curved shape with the center of curvature positioned forward in a side view.   The backrest of the chair according to any one of claims 1 to 3, wherein a rearward displacement amount of the intermediate frame with respect to both side frames is partially varied in the vertical direction.   The backrest of the chair according to any one of claims 1 to 4, wherein the intermediate frame is formed of an elastic material and the intermediate frame can be elastically deformed forward when a load is applied to the front surface portion of the upholstery material. .   An extension frame that curves upward is attached to the upper ends of both side frames of the back frame so that the intermediate portion is positioned forward of the upper and lower portions in a side view, and the upper ends of both extension frames are connected in the left-right direction. The backrest of the chair according to any one of claims 1 to 5, wherein the backrest is connected by a facing top frame, and a headrest frame is formed by the extension frame and the top frame.

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