JP5485534B2 - Chair - Google Patents

Description

  The present invention relates to a chair in which lower end portions of a backrest are attached to both rear side portions of a seat so as to be rotatable in the front-rear direction.

As such a chair, for example, as described in Patent Document 1, side pieces on both sides of the lower part of the backrest in the form of a plate are placed on the backrest pivot supporting part that stands up from both sides of the rear part of the seat. Some are pivotally mounted in a direction.
JP-A-48-63856

  In the chair described in the above-mentioned patent document, the lower end of the backrest and the rear end of the seat are pivoted so that they overlap each other. There is a risk that the portion may come into contact with the lower surface of the rear end portion of the seat, and the range in which the backrest is rotated rearward is limited, so that it is not possible to comfortably lean on it.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a chair that can be swung comfortably on the backrest with a large range of rotation of the backrest relative to the seat. .

According to the present invention, the above-mentioned problems are solved as follows.
(1) The backrest pivot part facing upward is integrally connected to both sides of the back of the seat, and the front side pieces provided at the lower parts on both sides of the backrest are connected to the back surface of the backrest pivot part. A lower part of the backrest is separated from the rear end of the seat rearwardly, and is pivotally pivoted by a left-right axis; and a rear surface of the backrest pivot part, and a lower front surface of the backrest opposite thereto Is an arc shape in a side view centered on the axis.

  With such a configuration, there is no possibility that the lower end portion of the backrest interferes with the rear end of the seat, so that the range of rotation of the backrest to the rear becomes large, and the backrest can be comfortably leaned.

(2) In the above item (1), the lower part of the backrest is curved so that the middle part is located behind the both sides in plan view, and the lower part of the backrest is separated from the rear end of the seat. To do.

  With such a configuration, the lower end portion of the backrest is greatly separated from the rear end of the seat, so that the backrest can be tilted more greatly and the backrest can be leaned in a more comfortable posture.

(3) In the above paragraph (1) or (2), the backrest is connected to the upper and lower ends of a pair of left and right side frames facing in the vertical direction by an upper frame and a lower frame facing in the horizontal direction. A back frame having a substantially rectangular frame shape is formed, and forward side pieces are integrally connected to lower portions on both sides of the both side frames.

  With such a configuration, the front side piece is integrally connected to the side frame of the back frame having a rectangular frame shape, so the strength of the front side piece is high, and the lower part of the backrest is Can be pivotally attached to the backrest pivot.

(4) In any one of the above items (1) to (3), the outer surface of the backrest pivoting portion is bulged outward so that the pivoting portion of the forward-side piece is located on the outermost side. .

  With such a configuration, the inner surface of the forward-facing side piece does not come into extensive contact with the outer surface of the backrest pivot, so that a sliding noise is generated when the backrest is rotated, and the backrest pivot The risk that scratches will be formed on the surface facing the forward side piece is reduced.

(5) In any one of the above items (1) to (4), an armrest portion facing forward is connected to the upper end of the backrest pivot portion, and an armrest is formed by the backrest pivot portion and the armrest portion. To do.

  With such a configuration, even in a chair in which an armrest is continuously provided on the seat, the rotation range of the backrest in the front-rear direction can be increased without causing the backrest to interfere with the armrest.

  According to the present invention, since there is no possibility that the lower end portion of the backrest interferes with the rear end of the seat, the range of rotation of the backrest to the rear becomes large, and the backrest can be comfortably leaned.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of the chair 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 toward the front from the upper end of the pedestal 2 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 support portion 7a, and the overall shape is substantially a forward triangle in a side view converging toward the front upper direction. .

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. 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 covering portion 27 has a low density mesh material with a coarse mesh, and at least the front surface portion 28a of the backrest covering portion 28 has a fine mesh material with a fine density. and tare Ru.

  The direction of the weave or stitch of the mesh material is such 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 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 with a fine mesh, and the surface thereof is flexible and has a mesh material with low translucency or low transparency. 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.

  Furthermore, the front part 27a and the rear part 27b in the headrest cover part 27, and the front part 28a and the rear part 28b in the backrest cover part 28 are not only made of different materials but also different colors to improve 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 front side pieces 10 and 10 project forward, and the lower end portions of the front surface portion 28a and the rear surface portion 28b 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.

  As described above, when the rearward displacement amount of the intermediate frame 21 with respect to the side frames 18 and 18 is increased toward the lower side, the material, dimensions, etc. are the same in any part in the vertical direction. By simply fitting the upholstery material 26 to the back frame 22, the initial tension of the upholstery material 26 at the lower portion of the backrest 9 can be made larger than that at the upper portion of the backrest 9. 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. Without changing the tension, the tension of the upholstery material 26 when mounted on the back frame 22 can be partially varied in the vertical direction.
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.

  In the above-described embodiment, the seat 5 is applied to a chair that rotates from the rearward and upward standby position to a substantially horizontal use position. However, the seat is fixed to the lower support of the chair. The present invention can also be applied to a chair provided.

It is a side view when one embodiment of the chair of the present invention is shown and a seat is in a standby position. Similarly, it is a side view when the seat is in a use position that is substantially horizontal. Similarly, it is a side view when the backrest is tilted backward. It is the perspective view which looked at the back frame and the upholstery material fitted to this from diagonally backward.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Pillar 3 Support base 4 Lower structure 5 Seat 6 Base axis 7 Armrest 7a Backrest pivot support part 7b Elbow rest part 8 Curved surface 9 Backrest 10 Forward side piece 11 Support axis 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 (4)

Back support pivots facing upwards are integrally connected to both sides of the back of the seat, and the front side pieces provided at the lower parts of both sides of the back support are connected to the lower side of the back support on the outer surface of the back support pivots. Is pivotally mounted by a left and right axis so as to be spaced rearward from the rear end of the seat, and the back surface of the backrest pivot portion and the lower front surface of the backrest facing the back surface, The lower part of the backrest is curved in a side view centered on the axis, and the lower part of the backrest is curved so that the middle part is located behind the both sides in plan view, and the lower part of the backrest is the rear end of the seat A chair characterized in that it is spaced further rearward . The back shape is formed by connecting the upper and lower ends of a pair of left and right side frames facing in the vertical direction with the upper frame and the lower frame facing in the horizontal direction, and the front shape is a substantially rectangular frame shape. The chair according to claim 1, further comprising a back frame, and a forward-side piece integrally connected to lower portions of both side frames. The chair according to claim 1 or 2 , wherein the outer side surface of the backrest pivot part is bulged outward so that the pivotal part of the forward side piece is located on the outermost side. The chair according to any one of claims 1 to 3, wherein an elbow rest portion facing forward is continuously provided at an upper end of the backrest pivot support portion, and an armrest is formed by the backrest pivot support portion and the elbow rest portion.

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