JP5833714B2 - Chair backrest device - Google Patents

Description

  The present invention relates to a backrest device for a chair in which a perforated sheet-like tension member, especially a mesh-like (mesh-like) tension member, is stretched on a backrest frame, and in particular, The present invention relates to a chair backrest device in which a tension member is stretched on both sides of the rear surface.

  In a conventional chair backrest device, the upper ends of the left and right side frames facing up and down are connected by an upper frame facing up and down to form a backrest frame. A sheet-like tension material, for example, a mesh-shaped tension material knitted into a bag shape with an opening at the bottom, is fitted from above, so that the tension material is stretched on the front and rear surfaces of the backrest frame. A device having such a configuration is known (see Patent Document 1).

  However, the backrest structure described in Patent Document 1 has an excellent effect in improving the breathability and elasticity as the backrest, but the tension is stretched between the front and rear surfaces of the backrest frame. When the material is a mesh-like tension material, the moire pattern that is a so-called "interference fringe" that occurs when the meshes of the tension material on the front and back interfere with each other is simply a single blurring that resembles the shape of the mesh However, there was a problem that it was simple and lacked change, and there was no depth in design.

European Patent No. 922419

  In view of the above-described situation, the present invention changes the moire pattern generated when the perforated sheet holes interfere with each other when the perforated sheet-shaped stretch material is stretched on both the front and back sides of the backrest frame. It is an object of the present invention to provide a chair backrest device that can be clearly displayed in an excellent pattern that is rich in design and deep in design.

  The above-described problems are solved by the invention having the following configuration, as described in each claim in the section “Claims”.

(1) The left and right side frames facing the up and down direction are connected to each other by a curved frame that faces the left and right direction and has an intermediate portion located behind the both side portions in plan view to form a backrest frame. In the chair backrest device in which a perforated sheet-like stretch material is stretched on the front and rear surfaces of the backrest frame, the shape of the holes on both the front and rear sides of the backrest frame on the front and rear surfaces of the backrest frame Moire patterns appear by making them the same shape and making the sizes of the holes different between the front surface and the rear surface of the backrest frame .

(2) In the above item (1), the upholstery material is formed in a bag shape having an open bottom.

(3) In the above item (2), an upper frame that connects the upper ends of the left and right side frames is formed as a curved frame in which the intermediate portion is located behind the both sides in plan view.

(4) In the above item (3), a lower frame that connects the lower ends of the left and right side frames is formed as a curved frame in which the intermediate portion is located behind the both sides in plan view, and the lower portion is The bag-like tension material that opens is stretched until it reaches the lower frame.

(5) In the above item (4), the lower end opening of the bag-like tension member is attached to the lower frame.
The specific contents of the invention are as follows.

According to the present invention, the following effects can be obtained.
According to the first aspect of the present invention, the left and right side frames are stretched on both front and rear surfaces of the backrest frame connected by a curved frame in which the intermediate portion is located behind the both sides in plan view. Due to the tension, the difference in curvature radius between the front surface and the rear surface of the backrest frame in plan view makes it easier to positively shift the positions of the holes provided in the tension members on the front and rear surfaces. Therefore, the moire pattern generated when the hole portions of the tension material on the front and rear surfaces interfere with each other can be made to appear as an excellent pattern rich in change and deep in design.

According to the second aspect of the present invention, since the upholstery is in the form of a bag that opens downward, the upholstery can be easily attached to the backrest frame. In addition, since the tension generated by being stretched on the backrest frame acts on both the tension material located on the front surface and the tension material located on the rear surface of the backrest frame, the size of the holes formed in each Variations are unlikely to occur.

  According to the invention described in claim 3, since the upper frame that connects the upper ends of the left and right side frames is formed as a curved frame in which the intermediate portion is located behind the both side portions in plan view, The change of the moire pattern due to the size of the hole formed in the upholstery material continues continuously from the upper part to the lower part of the backrest.

  According to the invention of claim 4, the lower frame that connects the lower ends of the left and right side frames is formed as a curved frame in which the intermediate portion is located behind the both sides in plan view, and the lower portion is open. Since the bag-like tension material stretched until it reaches the lower frame, the change in the moire pattern due to the size of the holes formed in the bag-like tension material is more reliable, continuously from the upper part to the lower part of the backrest It will continue.

  According to the fifth aspect of the present invention, since the lower end opening of the bag-like tension material is attached to the lower frame, the tension material can be easily sealed.

It is a side view of the chair provided with the backrest apparatus of one Embodiment in this invention. (Example) It is a front view which partially enlarges and shows the front tension material and the rear tension material by notching a part of the front tension material in the backrest of the chair. FIG. 3 is an enlarged longitudinal sectional view of a main part of a backrest taken along a line III-III in FIG. 2. It is a disassembled perspective view which shows the tension | tensile_strength state of the tension material to a backrest frame. FIG. 5A shows a moire pattern by changing the size (%) of the hole portion of the front tension member with respect to the rear tension member. FIG. FIG. 5B is a pattern diagram in the case of 95% size, FIG. 5B is a pattern diagram in the case where the hole portion of the front tension material is 90% with respect to the rear tension material, and FIG. It is a pattern diagram in the case where the hole portion of the front tension material is 80% of the size of the rear tension material. FIG. 6A shows another embodiment of a moire pattern pattern by changing the mesh size (%) of the front tension material with respect to the rear tension material. FIG. 6A shows the front tension material with respect to the rear tension material. FIG. 6B is a pattern diagram in the case where the mesh of the front tension material is 90% of the size of the rear tension material, and FIG. ) Is a pattern diagram in the case where the mesh of the front tension material is 80% of the rear tension material.

  An embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a side view of a chair provided with a backrest device according to an embodiment of the present invention, and FIG. 2 is a cutaway view of a front tension member and a back tension of the front portion of the chair backrest. FIG. 3 is an enlarged vertical cross-sectional view of the main part of the backrest taken along the line III-III in FIG. 2.

  In the chair of the present invention, as shown in FIG. 1, a pedestal 2 whose height is adjustable by a gas spring (not shown) is erected at the center of a base 1 of the disc. A support base 3 is fixed to the upper end of the support base 3, and a lower structure 4 of a seat is provided on the support base 3.

  The support base 3 has a shape that expands in a substantially triangular shape from the upper end of the pedestal 2 in a plan view and a side view, and a front lower portion of the seat 5 is formed in the left-right direction at the front end portion. It is pivotally attached with a base shaft 6.

As shown in FIG. 1, the seat 5 is tilted slightly rearward and downward at the position A in the standby state tilted backward and upward, as shown by the imaginary line in FIG. It can be rotated about the base shaft 6 to the C position in the reclining use state.

A pair of left and right armrests 7 and 7 are integrally formed on the seat 5 at the rear portions on both sides.
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 dimensions of the elbow rest 7b in the front-rear direction are such that the front end of the elbow rest 7b is positioned forward of a vertical line passing through the center of the base shaft 6 that is the pivotally attached portion of the seat 5 at the position A in the standby state shown in FIG. Is set to
Further, when the seat 5 is at the B position in the normal use state, the front end portion of the elbow rest portion 7b is located slightly behind the vertical line passing through the center of the base shaft 6 on which the seat 5 is pivotally attached. is there.

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 around the support shaft 11 with respect to the seat 5 and the armrest 7 between the B position in the normal use state and the C position in the reclining use state. 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 up by urging the seat 5 toward the position A in the standby state.
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 to the A position in the standby state and the B position in the normal use state or the backrest 9 tilts, The relative position of the armrest 7 with respect to 5 does not change, and the elbow can be hung on the armrest 7 in a natural state from the A position in the standby state to the B position in the normal use state, and the usability of the chair is improved.

  When the seat 5 is at the A position in the standby state, the front end portion of the armrest 7b of the armrest 7 is positioned forward of a vertical line passing through the center of the base shaft 6 that is pivotally attached to the seat 5. Therefore, when seated by placing the hand on the front end portion of the elbow rest 7b in the standby position A, there is no risk that the seat 5 will rotate downward due to the load, and the seating can be performed with peace of mind. can do.

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. 2, the backrest 9 is composed of a pair of left and right side frames 18, 18 that face in the up-down direction, and an upper frame that faces the left-right direction connecting the upper ends of the left and right side frames 18, 18. 19 and a lower frame 20 facing the left and right direction connecting the lower ends of the left and right side frames 18 and 18, and a middle part of the upper frame 19 and the lower frame 20 in the left and right direction are connected to each other. A back frame 22 having a front face formed in a vertical rectangular frame shape is provided with an intermediate frame 21 facing the up and down direction located behind the 18 and 18.

The back frame 22 has an arcuate curved shape in which the center of curvature is located forward in the side view in the lower part of the side frames 18 and 18 and the lower part of the intermediate frame 21, and the upper frame 19 and the lower frame 20 Is a curved shape in which the intermediate portion is located behind the both side portions in plan view.
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.

  At the upper end of the backrest frame 22, extended 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 upper ends of the extension frames 23 and 23 with a top frame 24 facing in the left-right direction is integrally provided.

  The backrest frame 22 and the headrest frame 25 are stretched with a perforated sheet-like stretch material, for example, a stretchable mesh-like stretch material 26 knitted into a bag shape having a lower end and lower portions on both sides opened by a cloth or the like. ing.

As shown in FIGS. 2 and 3, the upholstery material 26 has a mesh 27 on the front surface 26A side and a mesh 28 on the rear surface 26B side of the backrest frame 22 having the same shape. The sizes of 27 and 28 are different from each other so that the front surface 26A side is fine and the rear surface 26B side is rough.
Thus, when the backrest 9 of the chair is viewed from the front, a clear pattern composed of a plurality of aggregate shapes similar to the shapes of the meshes 27 and 28 can be obtained and can be clearly displayed on the entire surface of the backrest 9. It has become.

In this case, the size of the mesh 27 on the front surface 26A of the tension member 26 is such that the size of the mesh 27 on the front surface 26A is 100% of the mesh 28 on the rear surface 26B. Therefore, it is preferable to be within the range of 95% to 80%.
That is, when the size of the mesh 27 on the front surface 26A of the upholstery material 26 is 95% or more and there is no difference from the size of the mesh 28 on the rear surface 26B, the moire pattern is simple and changes as in the conventional case. If the size of the mesh 27 of the front face 26A is 80% or less, for example 50%, there is no fun of combination, and if it is 25% or less, the mesh 27 of the front face 26A is simply not. The pattern of the mesh and the pattern of the mesh 28 on the rear surface 26B are overlapped with each other, resulting in a pattern with little change.

  FIG. 4 is an exploded perspective view showing a tensioning state of the tension member on the backrest frame.

In order to stretch the tension member 26 on the backrest frame 22, as shown in FIG. 4, the tension member 26 is covered from the upper end of the backrest frame 22 using a lower opening of the tension member 26 formed in a bag shape. This is done by fitting.
The tension member 26 is formed by connecting the front and rear edges of the lower end opening thereof to each other below the lower frame 20 in the backrest frame 22 by means of hook-and-loop fasteners, hooks, fasteners and other connecting means (all not shown). The lower frame 20 is attached to the lower end portion.

  FIG. 5 shows the pattern of the moire pattern according to the change (%) in the mesh size of the front tension material relative to the rear tension material, and FIG. 5 (A) shows the front tension material relative to the rear tension material. FIG. 5B is a pattern diagram when the mesh size is 95%, and FIG. 5B is a pattern diagram when the mesh size of the front tension material is 90% with respect to the rear tension material, FIG. These are pattern diagrams in the case where the mesh of the front tension material is 80% of the rear tension material.

  As shown in FIG. 5, when the mesh 27 of the front surface 26A and the mesh 28 of the rear surface 26B of the upholstery material 26 are made into the same round (sphere) shape, the round (spherical) shape of the meshes 27 and 28 is formed. A clear moire pattern composed of a plurality of collective shapes similar to those of a backrest 9 while increasing the number as the size of the mesh 27 of the front tension material 26A becomes smaller than the mesh 28 of the rear tension material 26B. Appear clearly on the entire surface.

  FIG. 6 shows another embodiment of a moire pattern according to a change (%) in the mesh size of the front tension material relative to the rear tension material, and FIG. FIG. 6B is a pattern diagram when the mesh of the front tension material is 95%, and FIG. 6B is a pattern diagram when the mesh of the front tension material is 90% of the size of the rear tension material. FIG. 6C is a pattern diagram when the mesh of the front tension material is 80% of the rear tension material.

  As shown in FIG. 6, when the mesh 27 of the front surface 26A and the mesh 28 of the rear surface 26B of the upholstery material 26 are formed into the same vertically long rectangular shape, the vertical streaky moire pattern is regularly arranged in the horizontal direction. In parallel, it appears clearly across the entire backrest 9.

  In the above embodiment, a mesh-like tension material made of cloth or the like is used as the perforated sheet-like tension material. However, a punching metal having a large number of holes, a wire knitted in a mesh shape, or the like is used. It is also possible to use it.

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 Backrest frame 23 Extension frame 24 Top frame 25 Headrest frame 26 Tension material 26A Front face 26B Rear face 27 Mesh (hole)
28 mesh (hole)
A Backrest position in standby B Backrest position in normal use C Backrest position in reclining use

Claims (5)

The left and right side frames facing the up and down direction are connected by a curved frame that faces the left and right direction and the middle part is located behind the both sides in plan view to form a backrest frame. In a backrest device for a chair, in which a perforated sheet-like tension material is stretched on the front and rear surfaces of the frame,
By making the shape of the holes on both the front and rear surfaces of the tension material on both the front and rear surfaces of the backrest frame the same shape, and making the sizes of those holes different on the front and rear surfaces of the backrest frame , A chair backrest device characterized by a moiré pattern .   The chair backrest device according to claim 1, wherein the upholstery is formed in a bag shape having an opening at the bottom.   The backrest device for a chair according to claim 2, wherein an upper frame that connects upper ends of the left and right side frames is formed as a curved frame in which the intermediate portion is located behind the both sides in plan view.   A lower frame that connects the lower ends of the left and right side frames is formed as a curved frame in which the intermediate portion is located behind the both sides in plan view. The backrest device for a chair according to claim 3, wherein the backrest device is stretched to the end. The backrest device for a chair according to claim 4, wherein a lower end opening of the bag-like tension member is attached to the lower frame.

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