JP6379377B2 - Chair - Google Patents

Description

  The present invention relates to a chair having an improved load support such as a seat or a backrest.

As a chair used for office work or the like, there is a chair that includes a plate member in a seat body that supports a load of a seated person. In this type of chair, if the entire plate member of the seat body is highly rigid, it is difficult to obtain a soft seating feeling. For this reason, a chair has been devised in which a part of the plate member can be elastically deformed (see Patent Documents 1 and 2).
In the chairs described in Patent Documents 1 and 2, the peripheral part of the plate member of the seat is a supported part supported by the chair frame, and the load of the seated person is input inside the supported part. The receiving portion is connected between the supported portion and the load receiving portion by an elastically deformable connecting portion. The connecting portion is formed by a band-like piece curved downward in a U-shaped cross section, and elastically deforms so that the belt-like piece of the connecting portion opens when a load of a seated person is input to the load receiving portion. Further, the concave deformation of the load receiving portion is promoted.

Japanese Patent No. 4518603 Japanese Patent No. 4238083 JP2013-103068A

  However, in the chairs described in Patent Documents 1 and 2, since the load receiving portion is bent and deformed from the approximate center in the width direction to the back surface direction (downward) in response to the load input from the seated person, the load receiving portion With this concave deformation, the seated person's buttocks are pressed from the side, and there is a concern that the seated person may be given a tight seating feeling.

  On the other hand, as a countermeasure, it is conceivable to apply the technique described in Patent Document 3 in which the entire area of the plate member is bent in a plane direction when the occupant is seated. In this case, the seating is performed at the time of sitting or after sitting. Since the plate member is deformed in response to the detailed operation of the person, there is a concern that the elastic return force to the initial position may be reduced due to deterioration over time, and the strength generated accordingly may be reduced.

  Therefore, the present invention enables the load receiving portion of the load support body to be displaced along the load input direction while maintaining a flat surface when the load of the seated person is input to the load support body such as the seat body, An object of the present invention is to provide a chair capable of improving the sitting feeling and maintaining durability.

The chair according to the present invention employs the following configuration in order to solve the above problems.
A supported portion supported by the chair body, a load receiving portion that is disposed inside the supported portion and receives a load of a seated person, and a connecting portion that connects the supported portion and the load receiving portion. In the chair provided with a load support having an elastic deformation of the connecting portion to promote the displacement of the load receiving portion, the load receiving portion has a higher rigidity in a load input direction from a seated person than the rigidity of the connecting portion. The first connecting portion is rigid, and the connecting portion is connected to the load receiving portion, and is extended and deformed in a direction toward the supported portion by a load input from the seated person through the load receiving portion, One end portion is connected to the first deformable portion, the other end portion is connected to the supported portion, and the supported portion is input by a load input from the seated person through the load receiving portion and the first deformable portion. a second deformable portion that deforms contracts in the direction towards the, features It is characterized in.
Thus, when the load of the seated person to the load receiving portion is input, shrinkage second deformation portion first deformation portion of the connecting portion while deforming extends in a direction toward the supported portion in a direction toward the supported portion As a result, the load receiving portion sinks along the load input direction while maintaining a substantially flat surface. The seated person does not receive a seating feeling that the body is pressed from both sides by the above movement of the connecting portion. When the load of the seated person is input to the load receiving part, the expansion deformation of the first deforming part is absorbed by the contraction deformation of the second deforming part so that the whole connecting part is in the direction of load input from the seated person. Since the load receiving portion is displaced in the back direction while elastically deforming in the intersecting direction, the seated person can obtain a soft seating feeling.

The first deforming portion is formed by bending or bending on the supported portion side so as to form an obtuse angle on the opposite side to the load input side with respect to the load receiving surface of the load receiving portion. In addition, it may be configured to have at least one folded shape that is curved or bent in a direction intersecting the load receiving surface of the load receiving portion.
Accordingly, the first deformable portion and the second deformable portion have a smoothly continuous shape, and the second deformable portion can be efficiently contracted and deformed by the load input from the load receiving portion to the first deformable portion. Become.

The second deforming portion has a convex folded portion that curves or bends convexly toward the load input side from the seated person, and the first deforming portion is close to the load receiving portion of the convex folded portion, and The maximum height difference in the load input direction of the convex folded portion of the second deformable portion connected to the position farthest from the load input side is the maximum height difference in the load input direction of the first deformable portion. It is desirable to set a larger value.
In this case, since the first deforming portion is connected to the position closest to the load input side near the load receiving portion of the convex folded portion, the first deformation is performed regardless of the sinking displacement of the load receiving portion. It is possible to efficiently apply a load in a direction in which the second deformable portion is contracted and deformed from the portion. In addition, since the maximum height difference in the load input direction of the convex folded portion is set larger than the maximum height difference in the load input direction of the first deformable portion, the second deformable portion is made as thin as possible. In addition to being able to flexibly deform without deformation, the first deforming portion does not occupy a large space at a position close to the load receiving portion. Therefore, this makes it possible to improve the durability of the second deformable portion and increase the space efficiency on the back side of the load support.

The folded portion of the second deforming portion is preferably formed such that two surfaces sandwiching the ridge line portion form an acute angle.
Thereby, it becomes possible to deform | transform a 2nd deformation | transformation part more flexibly with the load input into the 1st deformation | transformation part from the load receiving part.

According to the present invention, when a seated person's load is input to the load receiving portion, the first deformable portion of the connecting portion extends and deforms in the direction toward the supported portion , and the second deformable portion becomes the supported portion . Since it shrinks and deforms in the direction of heading, it can be displaced along the load input direction while maintaining the load receiving portion substantially flat. Therefore, the seated person seated on the load receiving portion does not receive a tight seating feeling from the load receiving portion, and the seating feeling becomes good.
According to the present invention, when the load is input from the seated person, the entire connecting portion is elastically deformed so that the expansion deformation of the first deformation portion is absorbed by the contraction deformation of the second deformation portion. Deterioration can be prevented in advance.

It is a side view of the chair of one Embodiment of this invention. It is a rear view of the chair of one Embodiment of this invention. It is a top view of the seat board of the chair of one Embodiment of this invention. It is sectional drawing corresponding to the IV-IV cross section of FIG. 3 of the seat board of one Embodiment of this invention. It is sectional drawing corresponding to the area | region of the left half of FIG. 4 of the seat body and seat frame of one Embodiment of this invention. It is sectional drawing corresponding to the VI-VI cross section of FIG. 3 of the seat board of one Embodiment of this invention. It is sectional drawing corresponding to the area | region of the left half of FIG. 6 of the seat body and seat frame of one Embodiment of this invention. It is sectional drawing corresponding to the VIII-VIII cross section of FIG. 3 of the seat board of one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the following description, the direction indicated by the arrow FR in the figure facing the front of the person seated in the chair in a regular posture is referred to as “front”, and the opposite direction is referred to as “rear”. For “upper”, “lower”, “left”, and “right”, the direction indicated by the arrow UP in the figure above the person sitting on the chair in a regular posture is “up” and the opposite direction is “ The direction indicated by the arrow LH on the left side of the person seated in a normal posture on the chair is called “left”, and the direction opposite to that is called “right”.

1 and 2 are a side view and a rear view showing the overall configuration of the chair 1 of this embodiment.
As shown in these drawings, a chair 1 according to this embodiment includes a leg 2 placed on a floor F, a box-shaped support base 3 installed at the upper end of the leg 2, and a seated person. A seat body 4, a backrest 6 extending from the support base 3 to the rear upper side and supporting the back of the seated person seated on the seat body 4, and a support frame 9 of the support base 3 and the backrest 6 described later. And a seat frame 5 that is supported by the front edge portion and supports the seat body 4 below. In this embodiment, the seat body 4 constitutes a load support body.

  The leg 2 includes a multi-leg 7 with casters 7 a and a pedestal 8 that stands up from the center of the multi-leg 7 and incorporates a gas spring as a lifting mechanism, and has a support base 3 at the upper end of the pedestal 8. Is mounted so as to be rotatable in the horizontal direction. The support base 3 incorporates an elevation adjustment mechanism for the pedestal column 8 and a tilt adjustment mechanism for the backrest 6. The backrest 6 includes a pair of backrest support frames 9 that are substantially L-shaped in side view, and a backrest body that directly supports the back of a seated person that is attached to the rear upper portion of the backrest support frame 9 and seated on the seat 4. 10, and the front end portion of the back support frame 9 is pivotally supported by the support base 3 so as to be swingable. In the figure, reference numeral 12 denotes a pivot shaft of the back support frame 9 on the support base 3. Further, a gas spring 20 for urging the backrest body 10 in the upright direction is connected between the rear end portion of the support base 3 and the intermediate portion of the backrest support frame 9 so as to be swingable.

The backrest body 10 of the backrest portion 6 includes a back plate 11 that forms a skeleton, a tension member 13 that covers a portion of the front plate side and a part of the back surface of the back plate 11, and a back surface side (rear surface) of the back plate 11. And a cover member 14 that covers the side). A cushion material (not shown) made of urethane or the like is fused to the back surface of the tension member 13.
The cover member 14 covering the back surface side of the back plate 11 is fixed to the back surface side of the back plate 11 by appropriate means such as uneven fitting. In the case of this embodiment, the upward extending portion 9 a of the backrest support frame 9 that rises upward from the rear side of the seat body 4 is fastened and fixed to the front side of the cover member 14. The front side of the upward extension 9 a of the support frame 9 is covered with a back plate 11.

The seat body 4 includes a seat plate 15 constituting a skeleton member, a cushion material 50 (see FIGS. 5 and 7) disposed on the upper surface side of the seat plate 15, and an outer peripheral edge portion of the cushion material 50 and the seat plate 15. And a tension member 16 that covers a portion of the back surface.
The seat frame 5 extends along the width direction (left-right direction) of the seat body 4, and extends along the width direction of the seat body 4, and a front support shaft 17 that supports the front-side lower surface of the seat plate 15. The rear support shaft 18 that supports the rear lower surface of the seat plate 15, the left and right ends of the front support shaft 17 and the rear support shaft 18 are connected to each other, and the left and right sides of the seat plate 15 are connected to each other. And a pair of connecting plates 19 coupled to the lower surface of the side portion of the.

The front support shaft 17 of the seat frame 5 passes through the front edge of the support base 3 in the width direction, and is supported by the support base 3 so as to be rotatable and movable back and forth. Specifically, a guide hole 21 inclined obliquely rearward from the front end portion is provided at the front edge portion of the support base 3 so that the front support shaft 17 can rotate and slide into the guide hole 21. It is supported. Further, the front support shaft 17 is always urged forward by a biasing spring (not shown) inside the support base 3.
On the other hand, the rear support shaft 18 of the seat frame 5 is disposed on the rear upper side of the support base 3, and both left and right edges are on the upper surface of each front extension 9 b of the left and right back support frames 9, and the bearing member 51 And is rotatably supported via the mounting bracket 22. Therefore, in the seat frame 5, when the backrest 6 is tilted rearward about the pivot shaft 12 at the front end of the backrest support frame 9, the rear support shaft is tilted downward by the forward extension 9 b. 18 is pulled diagonally downward on the rear side, and the front support shaft 17 slides diagonally backward and downward in the guide hole 21 of the support base 3 accordingly. With this operation of the seat frame 5, the seat body 4 changes its posture so as to be displaced obliquely rearward and downward following the tilting of the backrest portion 6.
In this embodiment, the leg body 2, the support base 3, the backrest support frame 9, the seat frame 5 and the like constitute a chair body.

3 is a view of the seat plate 15 of the seat body 4 as viewed from above, FIG. 4 is a cross-sectional view of the seat plate 15 corresponding to the IV-IV section of FIG. 3, and FIG. FIG. 5 is a cross-sectional view of the seat frame 5 corresponding to the left half region of FIG. 4. 6 is a cross-sectional view corresponding to the VI-VI cross section of FIG. 3 of the seat plate 15, and FIG. 7 is a cross-sectional view corresponding to the left half region of FIG. FIG. 8 is a cross-sectional view of the seat plate 15 corresponding to the VIII-VIII cross section of FIG. In FIG. 3, a part of the support base 3, the seat frame 5, and the backrest support frame 9 is shown together with a chain line.
The seat plate 15 is formed of a synthetic resin having a strength capable of supporting the load of the seated person, and has a substantially rectangular shape with rounded four corners when viewed from above. The outer peripheral edge of the seat plate 15 is provided with a plurality of reinforcing ribs 23 projecting from the upper surface and the lower surface, thereby increasing the rigidity in the vertical direction (bending direction) and torsional direction. In the case of this embodiment, the left and right side edge portions of the outer peripheral edge portion of the seat plate 15 are the supported portions 24 that are directly supported by the seat frame 5 (chair body), and the left and right supported portions 24 are The seat plate 15 having high rigidity is connected to each other by the front edge portion and the rear edge portion. The left and right edges of the front support shaft 17 and the rear support shaft 18 of the seat frame 5 are inclined upward (see FIG. 7), and each of the inclined edges is left and right via the connecting plate 19. It is connected to the lower surface of the supported portion 24 by bolt fastening or the like.

In a region between the left and right supported parts 24 of the seat plate 15, when a seated person is seated in a normal posture at the center of the upper surface of the seat body 4, a load receiving part 25 to which a load is directly input from the seated person's buttocks. Is provided. The load receiving portion 25 is a region having a substantially rectangular shape when viewed from above, and the left and right side portions thereof are connected to the supported portion 24 of the seat plate 15 via a thin connecting portion 26 described in detail later.
The upper surface side of the load receiving portion 25 is formed flat, and a plurality of reinforcing ribs 27 are formed on the rear surface side in order to increase the bending rigidity and torsional rigidity of the load receiving portion 25 in the vertical direction. The load receiving portion 25 is higher in rigidity in the load input direction (vertical direction) from the seated person than the rigidity of the connecting portion 26.

  The left and right connecting portions 26 of the seat plate 15 are connected to the end portions of the load receiving portion 25, and the adjacent supported portions 24 are connected by load input from the seated person (load input directed downward) through the load receiving portion 25. A first deformable portion 28 that extends and deforms in the direction, and one end connected to the first deformable portion 28 and the other end connected to the adjacent supported portion 24, and from a seated person through the first deformable portion 28 And a second deforming portion 29 that contracts and deforms in a direction toward the adjacent supported portion 24 by the load input.

  The first deformable portion 28 and the second deformable portion 29 of the connecting portion 26 are formed thinner than the supported portion 24 and the load receiving portion 25, and the load of the seated person is input to the load receiving portion 25. Sometimes the entire area is flexibly deformed. Further, in the position of the seat plate 15 that faces the front end portion and the rear end portion of each of the left and right connection portions 26, the connection portions 26 are not restricted by the front edge portion and the rear edge portion of the seat plate 15. A slit 30 extending in the left-right direction is formed so as to be freely deformable. Further, the width in the left-right direction of each connecting portion 26 is not constant from the front end side to the rear end side, and is set so that the width of the region on the rear end side is wider than the front end side.

  As shown in FIGS. 4 to 7, the first deforming portion 28 draws a gentle arc on the side of the supported portion 24 adjacent to the substantially horizontal upper surface of the load receiving portion 25 so as to form an obtuse angle on the lower side. Is curved. Moreover, the 2nd deformation | transformation part 29 is provided with the substantially U-shaped convex folding | turning part 29a which curved in the up-down direction and made the upper end side the top part. The lowermost end portion of the first deformable portion 28 is connected to the end portion of the convex folded portion 29a closer to the inside of the seat plate 15 by drawing a smooth arc. Moreover, the edge part near the outer side of the seat plate 15 of the convex folding | turning part 29a is connected to the to-be-supported part 24 which draws a smooth circular arc similarly. In this embodiment, only one convex folded portion 29a with the convex portion facing upward is provided, but the second deformable portion 29 has the convex folded portion 29a with the convex portion facing upward and the convex portion at the bottom. Any number of convex folded portions 29a facing the surface may be continuous.

  As shown in FIGS. 5 and 7, the maximum height difference in the vertical direction (in the load input direction) of the convex folded portion 29 a of the second deformation portion 29 is the vertical direction of the first deformation portion 28. It is set larger than the maximum height difference (in the load input direction). And the convex folding | turning part 29a of the 2nd deformation | transformation part 29 is curving so that two surfaces which pinch | interpose the ridgeline part a of a top part may comprise an acute angle. In the case of this embodiment, the first deformable portion 28 and the second deformable portion 29 have a shape in which an arc-shaped cross section is continuous so as to be smoothly connected to the load receiving portion 25 and the supported portion 24. The first deformable portion 28 and the second deformable portion 29 do not necessarily have a curved shape, and may have a bent shape.

  Here, when a load is input to the load receiving portion 25 from the seated person, the seat plate 15 sinks downward while elastically deforming the first deformation portion 28 and the second deformation portion 29 of the connecting portion 26 in the left-right direction. Try to displace it. At this time, the rear side region of the load receiving portion 25 that is located immediately below the center of gravity of the seated person receives a larger load than the front side region. For this reason, in this seat board 15, the slit 31 extended in the left-right direction is provided between the load receiving part 25 and the rear edge part of the seat board 15 so that a rear side area | region may sink more smoothly. Yes. The width of the left and right connecting portions 26 is set wider on the rear side than on the front side as described above, so that the rear side region of the load receiving portion 25 is submerged more smoothly together with the function of the slit 31. Because.

  Further, a regulating convex portion 32 having a concave contact surface on the lower surface side is projected from a position directly above the rear support shaft 18 of the seat frame 5 on the back surface of the load receiving portion 25 of the seat plate 15. . When the rear side region of the load receiving portion 25 sinks more than a predetermined amount, the restricting convex portion 32 comes into contact with the upper surface of the central region of the rear support shaft 18 as shown by a two-dot chain line in FIG. Thus, excessive sinking of the rear side region of the load receiving portion 25 is restricted.

Next, the behavior of the seat plate 15 when a seated person sits on the chair 1 of this embodiment will be described in detail.
When the seated person sits on the seat plate 15 and the load of the seated person acts on the load receiving portion 25 substantially vertically downward, the load is applied to the left and right connecting portions 26 as shown by two-dot chain lines in FIGS. The first deformable portion 28 is elastically deformed so as to be extended to the left and right, and the second deformable portion 29 receiving the load is elastically compressed in the direction of the adjacent supported portion 24. Deform. At this time, since the load receiving portion 25 is thicker than the connecting portion 26 and the back side is reinforced by the reinforcing rib 27, the elasticity of the connecting portion 26 does not occur without causing large deformation. It is displaced so as to sink downward by deformation.

As described above, in the chair 1 according to this embodiment, the rigidity in the vertical direction of the load receiving portion 25 of the seat plate 15 is set to be higher than the rigidity of the connecting portion 26, and the connecting portions 26 on both sides are loaded. When a seated person's load is input to the load receiving portion 25 and connected to the receiving portion 25 side, the first deforming portion 28 that extends and deforms outward in the width direction in response to the load is received. And a second deforming portion 29 that contracts and deforms in the direction of the supported portion 24 when a load on the seated person is transmitted through the first deforming portion 28 connected to the support portion 24. Sometimes, the load receiving portion 25 can be smoothly displaced downward while keeping the load receiving portion 25 substantially flat.
Therefore, the seated person sitting on the chair 1 can obtain a soft seating feeling by the sinking of the load receiving portion 25, and a wide area of the load receiving portion 25 is maintained in a flat state, so that the body is positioned on both sides. Because it is no longer squeezed, you will not receive a tight seating feeling.

  Further, in the chair 1 according to this embodiment, when the seated person's load acts on the load receiving portion 25, the first deformation portion 28 is deformed by the second deformation portion 29 by the above-described configuration. Since the entire connecting portion 26 is elastically deformed so as to absorb, local deterioration of the seat plate 15 due to large stress continuously acting on a part of the seat plate 15 can be prevented.

  Moreover, in the chair 1 of this embodiment, the 1st deformation | transformation part 28 of the connection part 26 curves to the to-be-supported part 24 side adjacent so that an obtuse angle may be made from the load receiving part 25 side to the downward side, Since the 2nd deformation part 29 is made into the shape which has the convex folding | turning part 29a which curves in U shape in the direction which cross | intersects a horizontal direction, the 1st deformation part 28 and the 2nd deformation part 29 continue smoothly It becomes the shape. For this reason, the second deformation portion 29 can be efficiently contracted and deformed by the load input from the load receiving portion 25 to the first deformation portion 28.

  In particular, in the case of this embodiment, the first deformation portion 28 is connected to the position farthest from the load input side near the load receiving portion 25 of the convex folded portion 29a of the second deformation portion 29. Even if the sinking amount of the load receiving portion 25 increases as well as the initial sinking of the receiving portion 25, the second deforming portion 29 can be efficiently contracted and deformed by the first deforming portion 28.

  Furthermore, in this embodiment, the maximum height difference in the load input direction of the convex folded portion 29a of the second deformable portion 29 is set larger than the maximum height difference in the load input direction of the first deformable portion 28. Therefore, the second deformable portion 29 can be flexibly contracted and deformed without making it as thin as possible. For this reason, durability of the 2nd deformation part 29 can be improved. Further, since the first deforming portion 28 does not occupy a large space at a position close to the load receiving portion 25, the space efficiency on the back surface side of the seat plate 15 is increased.

  Moreover, in the chair 1 of this embodiment, since the convex folding | turning part 29a of the 2nd deformation | transformation part 29 is formed so that the two surfaces which pinch | interpose the ridgeline part a may comprise an acute angle, it is 1st from the load receiving part 25. The second deformation part 29 can be deformed more flexibly by the load input to the deformation part 28.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above embodiment, the seat body constitutes the load support body, but the load support body is not limited to the seat body, and may be a backrest body of the backrest portion.

4 Seat (load support)
24 supported portion 25 load receiving portion 26 connecting portion 28 first deforming portion 29 second deforming portion 29a convex folded portion a ridge line portion

Claims (4)

A supported part supported by the chair body;
A load receiving portion disposed inside the supported portion and receiving a load of a seated person;
A connecting portion for connecting the supported portion and the load receiving portion;
A load support having
In the chair in which the elastic deformation of the connecting portion promotes the displacement of the load receiving portion,
The load receiving portion has a rigidity in a load input direction from a seated person that is higher than the rigidity of the connecting portion,
The connecting portion is connected to the load receiving portion, and has a first deforming portion that extends and deforms in a direction toward the supported portion by a load input from the seated person through the load receiving portion, and one end portion of the connecting portion is Connected to the first deformable portion and the other end is connected to the supported portion, and in a direction toward the supported portion by a load input from the seated person through the load receiving portion and the first deformable portion. And a second deformable portion that contracts and deforms. The first deforming portion is formed by bending or bending on the supported portion side so as to form an obtuse angle on the opposite side to the load input side with respect to the load receiving surface of the load receiving portion,
The chair according to claim 1, wherein the second deformable portion has at least one folded shape that is bent or bent in a direction intersecting with a load receiving surface of the load receiving portion. The second deforming portion has a convex folded portion that curves or bends convexly on the load input side from the seated person,
The first deforming portion is connected to a position near the load receiving portion of the convex folded portion and farthest from the load input side,
The maximum height difference in the load input direction of the convex folded portion of the second deformable portion is set larger than the maximum height difference in the load input direction of the first deformable portion. The chair according to claim 2.   The chair according to claim 2 or 3, wherein the folded portion of the second deformable portion is formed so that two surfaces sandwiching the ridge portion form an acute angle.

Images