JP6777281B2 - Chair - Google Patents

Description

The present invention relates to a chair.

Conventionally, a chair including a backrest frame that stands up from the rear of the seat body and a back plate supported by the front surface of the backrest frame has been proposed (for example, Patent Document 1). In this chair, a pair of left and right engaging portions consisting of a tubular body in the vertical direction with at least an opening on the lower surface are integrally projected backward on the rear surface of the back plate, and the backrest frame is formed on the engaging portions. A pair of left and right locking portions provided in the above are relatively rotatably engaged around an axis in the vertical direction.

Japanese Unexamined Patent Publication No. 2012-176276

For example, when the engaging portions protruding from the left and right sides of the back plate and the locking portions provided on the left and right sides of the backrest frame are respectively relatively rotatably engaged, the elastic force of the back plate causes the left and right sides to engage. The rotation of the engaging part and the locking part is restored to the original state. Further, for example, by using a spring member in addition to the conventional technique, it is possible to apply a restoring force to each of the left and right rotating shafts. However, in such a configuration, it is generally difficult to reduce the size of the rotating mechanism, which may be a constraint on the design of the chair. Therefore, it is desirable to realize a deformation mechanism that follows changes in the posture of the seated person with a simple configuration that can be miniaturized.

Therefore, an object of the present invention is to provide a backrest of a chair with improved followability to a seated person's posture by a simple configuration.

The chair according to the present invention includes a seat body on which a seated person sits, a back plate provided behind the seat body and flexed by the load of the seated person, and a backrest frame located behind the back plate and supporting the back plate. And an elastic connection portion for connecting the back plate and the backrest frame so as to allow the back plate to bend due to the load of the seated person. Further, the elastic connection portion connects the back plate and the backrest frame by an elastic member that allows the relative movement of the back plate and the backrest frame.

In this way, the elastic member allows the relative movement of the back plate and the backrest frame, so that the followability of the back plate to the posture of the seated person can be improved.

Further, at least a part of the elastic member may be accommodated in the accommodating space provided inside the backrest frame. In this way, by adopting a simple configuration in which the back plate and the backrest frame are connected by an elastic connecting portion having an elastic member, at least a part of the elastic member is provided inside the backrest frame. The mechanism according to the present invention becomes difficult to see in appearance. Therefore, it can be said that the mechanism can be easily applied to chairs of various designs.

Further, the elastic connection portions are connected in the vicinity of the left and right ends of the back plate, respectively, and the connection portion between the elastic connection portion and the back plate may be displaced to the seater side according to the bending of the back plate. Good. By connecting the elastic connection portions in the vicinity of the left and right ends of the back plate, the elastic connection portion is likely to be deformed by following an external force related to any part of the back plate.

Further, the elastic member may be a leaf spring. Specifically, such a configuration can be adopted.

Further, a deformation regulating portion that is movably provided in the accommodation space and regulates the movable range of the elastic member may be further provided. In this way, the movable range of the elastic member can be regulated, and the degree of deformation of the back plate can be adjusted.

Further, the elastic connection portion is arranged at a height near the waist of the seated person, and the back plate and the backrest are also above the elastic connection portion so as to allow the back plate to bend due to the load of the seated person. An elastic connection portion for connecting to the frame may be further provided. By increasing the number of elastic connections, it is possible to improve the performance of following the shape of the back plate with respect to changes in the posture of the seated person.

According to the present invention, it is possible to provide a backrest of a chair with improved followability to the posture of a seated person by a simple configuration.

It is a perspective view which looked at the chair which concerns on this embodiment from the front side upper side. It is a perspective view which looked at the chair which concerns on embodiment from the lower back side. It is a perspective view of the backrest frame and the elastic connection part seen from the upper side of the front side. It is a perspective view which looked at the circumference of the back plate support part and the elastic connection part of a backrest frame from the front side upper side. It is a perspective view which looked at the circumference of the back plate support part and the elastic connection part of the backrest frame from the lower part of the back side. It is an exploded perspective view which looked at the circumference of the back plate support part and the elastic connection part of a backrest frame from the front side upper side. It is an exploded perspective view which looked at the circumference of the back plate support part and the elastic connection part of the backrest frame from the lower part of the back side. It is a front view around the back plate support part of the backrest frame. It is a perspective view which shows the state which the slider was slid rearward, and was seen from the front side upper side around the back plate support part and the elastic connection part of the backrest frame. It is a perspective view which looked at the circumference of the back plate support part and elastic connection part which shows the deregulation state which does not display the back plate fixing part, and was seen from the front side upper side. It is a perspective view which looked at the circumference of the back plate support part and elastic connection part which shows the regulation state, which does not display the back plate fixing part, from the front side upper side. It is a top view around the back plate support part and the elastic connection part of the backrest frame. It is a top view for demonstrating the deformation around the elastic connection part when the load is applied evenly to the left and right with respect to the back plate in the state of deregulation.

Next, an embodiment of the chair according to the present invention will be described with reference to the drawings. It should be noted that the embodiments described below are examples for carrying out the present invention, and the present invention is not limited to the embodiments described below.

<Composition>
FIG. 1 is a perspective view of the chair 1 according to the present embodiment as viewed from above on the front side. Further, FIG. 2 is a perspective view of the chair 1 according to the present embodiment as viewed from below on the back side. In the following description, for convenience, the direction in which the seated person sitting on the chair 1 faces is referred to as the front (front), the direction in which the backrest is attached is referred to as the back (rear), and the left and right as seen from the seated person are referred to as the left side and the right side, respectively. Call. As shown in FIGS. 1 and 2, the chair 1 according to the present embodiment includes legs 2, shaft members 3, pedestals 4, seats 5, back plates 6, backrest frames 7, elastic connections 8, and armrests 9. The reclining mechanism 10 is provided.

The legs 2 support other configurations of the chair 1, such as the pedestal 4 and the seat 5, via the shaft member 3. The legs 2 are composed of five legs arranged in a radial pattern, and casters are connected to the tips of the legs. The leg 2 according to the present embodiment is an example, and various existing legs can be appropriately used. Further, a shaft member 3 extending in the vertical direction is connected to the center of the leg 2 in a plan view.

The shaft member 3 supports the pedestal 4, the seat 5, and the like together with the legs 2. The shaft member 3 includes a gas cylinder, a hydraulic cylinder, and the like. Then, the length of the shaft member 3 can be changed and the height of the seat 5 can be adjusted by operating a lever or the like (not shown) provided on the side surface of the pedestal 4. The shaft member 3 may have a simpler structure, such as a pipe having the same length. The lower end of the shaft member 3 is connected to the leg 2, and the upper end of the shaft member 3 is connected to the pedestal 4 that supports the seat body 5.

The seat body 5 is a seating surface that supports the buttocks of the seated person. The seat body 5 has a substantially quadrangular shape in a plan view, and has a sufficient area for the seated person to sit down. The seat 5 may have a circular shape, a polygonal shape, or any other shape. Further, a back plate 6 is provided on the back surface side of the seat body 5 so as to face vertically upward.

The back plate 6 is provided behind the seat body 5 and supports the waist and back of the seated person. The back plate 6 is a vertically long rectangle when viewed from the front, and is bent so that the area in contact with the waist of the seated person is convex toward the front side (that is, the seated person side). Further, the back plate 6 has, for example, a resin mesh structure, and is configured to bend when the seated person puts his / her weight on it. The plurality of holes forming the mesh of the back plate 6 are rhombic elongated in the vertical direction, but may be rectangular or elliptical elongated in the vertical direction, and the shape of the holes is not particularly limited. Further, the back plate 6 may have a square shape, a circular shape, a trapezoidal shape, or any other shape, and the height of the back plate 6 is not particularly limited. Further, a backrest frame 7 is connected to the back side of the back plate 6.

FIG. 3 is a perspective view of the backrest frame 7 and the elastic connection portion 8 as viewed from above on the front side. The backrest frame 7 is provided on the back side of the back plate 6 at intervals from the back plate 6. Further, the backrest frame 7 is a horizontal frame 72 that is located behind near both ends in the width direction of the back plate 6 and extends vertically and extends horizontally to connect the two vertical frames 71. And have. The vertical frame 71 is bent so that the portion corresponding to the height of the waist portion of the seated person is convex toward the front side in the side view. In other words, the vertical frame 71 is bent along the back plate 6 in terms of side view. Further, the horizontal frame 72 connects the vicinity of the most protruding portion of the two vertical frames 71 to the front side with each other to improve the rigidity of the backrest frame 7. Further, near the upper end of each vertical frame 71, a back plate fixing portion 73 that bends toward the front side and is fixed to the vicinity of the edge portion of the back plate 6 is provided. Further, in the vicinity of the portion most protruding toward the front side of each vertical frame 71, a back plate support portion 74 extending further toward the front side and supporting the vicinity of the edge portion of the back plate 6 via the elastic connecting portion 8 is provided. It is provided. Further, a base portion 75 extending below the seat body 5 and connected to the reclining mechanism 10 is connected to the lower ends of the two vertical frames 71.

FIG. 4 is a perspective view of the back plate support portion 74 and the elastic connection portion 8 of the backrest frame 7 as viewed from above on the front side. FIG. 5 is a perspective view of the back plate support portion 74 and the elastic connection portion 8 of the backrest frame 7 as viewed from below on the back surface side. Further, FIG. 6 is an exploded perspective view of the periphery of the back plate support portion 74 and the elastic connection portion 8 of the backrest frame 7 as viewed from above on the front side. FIG. 7 is an exploded perspective view of the back plate support portion 74 and the elastic connection portion 8 of the backrest frame 7 as viewed from below on the back surface side. Although FIGS. 4 to 7 show the back plate support portion 74 and the elastic connection portion 8 on the right side when viewed from the seated person, the chair 1 has the back plate support portion 74 and the elastic connection portion 8 symmetrically. have.

The back plate support portion 74 has an elastic connection portion accommodating space 741 having an opening at an end in the extension direction extending from the vertical frame 71, a wall surface 742 of the elastic connection portion accommodating space 741, and a wall surface 742 along the extension direction. It has a slit 743 linearly provided in a part of the above, and a bolt hole 744 into which a bolt for fixing the elastic connection portion 8 or a spring pin is inserted. The extending direction is the front of the chair 1 and is the direction in which the back plate 6 is located when viewed from the backrest frame 7.

The elastic connecting portion 8 has an elastic member, and has a restoring force that deforms by receiving an external force and restores the shape to a predetermined shape. Further, a part of the elastic connecting portion 8 is accommodated in the elastic connecting portion accommodating space 741 and is connected to the back side of the back plate 6, and the back plate 6 due to the load when the seater leans against the back plate 6. Deforms to allow for deflection. Specifically, the elastic connecting portion 8 has a back plate fixing portion 81, a slider 82, and a leaf spring 83. The elastic member is, for example, a leaf spring 83, and the elastic connection portion 8 connects the back plate 6 and the backrest frame 7 by the elastic member.

The leaf spring 83 is a plate-shaped metal member having a predetermined elastic force. In the present embodiment, the two faces having a large area of the leaf spring 83 face each other substantially left and right, and the longitudinal direction of the leaf spring 83 is arranged along the depth direction (front-back direction) of the chair 1. A bent portion 831 bent substantially vertically is provided at one end in front of the leaf spring 83, and the bent portion 831 is inserted into a slit provided in the back plate fixing portion 81 to form a leaf spring 83 and a back plate fixing portion 81. Are combined. Further, on the other end side behind the leaf spring 83, a fixing hole 832 for fixing in the elastic connection portion accommodating space 741 of the back plate support portion 74 by a bolt or a spring pin is provided, and at least one of the leaf springs 83 is provided. The portion is accommodated in the elastic connection accommodating space 741. Further, the elastic connection portion accommodating space 741 has a size in which the leaf spring 83 can be elastically deformed. Due to the elastic deformation of the leaf spring 83, the relative movement of the back plate 6 coupled to the back plate fixing portion 81 and the backrest frame on the fixing hole 832 side is allowed.

The back plate fixing portion 81 is fixed to the back surface side of the edge portion (end portion) in the width direction of the back plate 6. The slider 82 has a deformation regulating unit 821 and an operating unit 822. The deformation regulating portion 821 is housed in the elastic connection portion accommodating space 741 and restricts the deformation of the leaf spring 83 by closing the space in which the leaf spring 83 is deformed. The operation unit 822 is a knob located outside the elastic connection portion accommodating space 741 and in which the user can change the position of the slider 82. Further, the deformation regulating unit 821 and the operating unit 822 are connected via a connecting unit (not shown) penetrating the slit 743. More specifically, the deformation restricting portion 821 and the elastic connecting portion accommodating space 741 have substantially the same cross section perpendicular to the front-rear (depth) direction. Further, the length of the deformation regulating portion 821 in the front-rear direction is shorter than the length in the front-rear direction of the elastic connection portion accommodating space 741, and the deformation regulating portion 821 is inside the elastic connection portion accommodating space 741 by the difference of this length. In, the position can be moved in the front-back direction.

FIG. 8 is a front view of the backrest frame 7 around the back plate support portion 74. The elastic connection portion accommodating space 741 includes a first step portion 7411 in which the shape of the cross section of the leaf spring 83 (not shown in FIG. 8) is accommodated, and a deformation restricting portion 821 of the slider 82 (not shown in FIG. 8). It has a second step portion 7412 in which the shape of the cross section fits. The leaf spring 83 of the present embodiment is fixed in the elastic connection portion accommodating space 741 at one point by a bolt or the like, and the vertical size of the first step portion 7411 is the vertical direction of the cross-sectional shape of the leaf spring 83. The rotation of the leaf spring 83 around the fixing hole 832 is restricted because the size of the leaf spring 83 is substantially the same as that of Further, a groove portion 7421 that substantially matches the size of the operation portion 822 in the vertical direction is provided on the outer side of the wall surface 742 where the operation portion 822 of the slider 82 is located. The groove portion 7421 is formed to have an equal width along the depth direction in which the slit 743 extends, and functions as a guide that defines the moving direction of the slider 82, similarly to the slit 743.

FIG. 9 is a perspective view of the back plate support portion 74 and the elastic connection portion 8 of the backrest frame 7 as viewed from above on the front side, showing a state in which the slider 82 is slid rearward. The state in which the slider 82 is slid rearward is a deregulated state in which the deregulation of the deformation of the elastic connecting portion 8 (specifically, the leaf spring 83) is released. Further, the state shown in FIG. 4 is a state in which the slider 82 is slid forward, and is a regulated state in which deformation of the elastic connecting portion 8 is restricted.

FIG. 10 is a perspective view of the periphery of the back plate support portion 74 and the elastic connection portion 8 in the deregulated state, which does not display the back plate fixing portion 81 for convenience, as viewed from above on the front side. Similarly, FIG. 11 is a perspective view of the periphery of the regulated back plate support portion 74 and the elastic connection portion 8 as viewed from above on the front side, without displaying the back plate fixing portion 81 for convenience. In the deregulated state of FIG. 10, the deformation restricting portion 821 is located rearward in the elastic connection portion accommodating space 741, and the front end portion of the leaf spring 83 is inside the chair 1 as shown by the arrow of the one-point difference line. Can bend towards. That is, the back plate fixing portion 81 connected to the front of the leaf spring 83 can be displaced toward the inside of the chair 1. On the other hand, in the regulated state of FIG. 11, the deformation regulating portion 821 is located in front of the elastic connecting portion accommodating space 741 and blocks the space for the leaf spring 83 to be deformed (that is, the deformation is regulated). ). The slider 82 is moved to an arbitrary position between the regulated state shown in FIG. 4 and the regulated release state shown in FIG. 9 to adjust the degree to which the elastic connection portion 8 is allowed to be deformed. You can also.

FIG. 12 is a plan view of the periphery of the back plate support portion 74 and the elastic connection portion 8 of the backrest frame 7. The front end of the back plate support portion 74 and the rear end of the back plate fixing portion 81 of the elastic connection portion 8 are curved surfaces. Specifically, the front end of the back plate support portion 74 and the rear end of the back plate fixing portion 81 are on the back plate support portion 74 side of the leaf spring 83 (that is, the elastic member) in a plan view. It has an arc-shaped curved shape centered on the fixed part of. That is, the tip of the back plate support portion 74 has a shape along the deformation direction of the leaf spring 83, which is an elastic member. Therefore, when the leaf spring 83 is deformed, the back plate fixing portion 81 moves substantially along the above-mentioned curved shape, and the back plate fixing portion 81 and the back plate supporting portion 74 do not interfere with each other.

<Action>
FIG. 13 is a plan view for explaining the deformation around the elastic connection portion 8 when a load is evenly applied to the back plate 6 toward the rear in the deregulated state. It should be noted that FIG. 13 will also be described with reference to the front, back, left and right as seen from the seated person. Further, the solid line indicated by reference numeral 6 indicates the state of the back plate 6 before the load is applied (also referred to as “normal state”), and the broken line indicated by reference numeral 6 indicates the state of the back plate 6 deformed by the load. Shown. When the seated person sits down and takes a backward leaning posture, a load in the back direction acts on the back plate 6, and the back plate 6 bends so that the back side bulges.

At this time, as shown by the arrows in FIG. 13, the ends of the left and right elastic connecting portions 8 on the back plate 6 side (that is, the front side) are bent toward the inside of the chair 1 (that is, the seated side). On the other hand, when the seated person takes a forward leaning posture and separates from the back plate 6, the external force does not act on the back plate 6, and the restoring force of the leaf spring 83 (not shown in FIG. 13) is added to the restoring force of the back plate 6. Acts, and the back plate 6 returns to the normal state. In particular, even when the load applied to the left and right is uneven, the back plate 6 is seated by the restoring force of the elastic connecting portions 8 (more specifically, the leaf spring 83) provided on the left and right respectively. It will be deformed according to the posture of the person.

Further, the armrests 9 of FIGS. 1 and 2 are provided from the pedestal 4 toward the upper left and right of the seat 5. The armrest 9 has a substantially horizontal surface at the upper end, and the seated person can rest his / her elbow. The shape of the armrest 9 is not limited to that shown in FIGS. 1 and 2, and various shapes can be adopted.

Further, the reclining mechanism 10 of FIGS. 1 and 2 is connected to the pedestal 4 and the backrest frame 7, and the backrest frame 7 and the back plate 6 are tilted rearward by a mechanism such as a mechanical type, a gas cylinder type, or a hydraulic cylinder type. Can be made to. As for the reclining mechanism 10, various existing mechanisms can be adopted.

<Effect>
By providing the elastic connecting portion 8 in the chair 1 according to the present embodiment, the relative movement of the back plate 6 and the backrest frame 7 is allowed. Specifically, the waist portion of the back plate 6 connected to the backrest frame via the elastic connecting portion 8 flexibly bends, and the back plate 6 deforms following the posture of the seated person. Further, by adopting an elastic member such as a leaf spring 83, it is generally easier to reduce the size than in the case of adopting a mechanism that deforms around a rotation shaft, for example. Further, at least a part of the leaf spring 83 of the elastic connecting portion 8 is accommodated in the elastic connecting portion accommodating space 741 provided in the backrest frame 7 supporting the back plate 6, and the deformation mechanism can be seen from the outside. It's getting harder. In this respect, it can be said that it can be applied to various designs as compared with the case of adopting a mechanism that deforms around the rotation axis, for example. Further, by moving the position of the slider 82, it is possible to adjust the degree to which the elastic connection portion 8 is allowed to be deformed according to the load on the back plate 6 according to the preference of the seated person.

<Modification example>
In the above-described embodiment, the elastic connection portions 8 are provided at the height around the waist of the seated person, one on each side, but more elastic connection portions 8 are provided between the back plate 6 and the backrest frame 7. It may be. For example, the backrest frame 7 may support the back plate 6 via an elastic connecting portion 8 instead of the back plate fixing portion 73 at the upper end of the vertical frame 71. By increasing the number of movable parts, the back plate 6 can be deformed by more flexibly following various postures of the seated person.

Further, the elastic connection portion 8 does not have to have the slider 82. In this case, the deformation allowance cannot be adjusted, but the other effects described in the embodiment can be obtained as well.

Further, the leaf spring 83 may be formed of resin or the like instead of metal. Further, the shape is not limited to the plate shape, and various shapes having elastic force can be adopted.

Although the embodiments and modifications of the present invention have been described above, the chair according to the present invention is not limited to these, and these configurations can be combined as much as possible.

1 Chair 2 Legs 3 Axle member 4 Cradle 5 Seat 6 Back plate 7 Backrest frame 71 Vertical frame 72 Horizontal frame 73 Back plate fixing part 74 Back plate supporting part 741 Elastic connection part Accommodation space 8 Elastic connection part 81 Back plate fixing part 82 Slider 821 Deformation control unit 822 Operation unit 83 Leaf spring 9 Armrest 10 Reclining mechanism

Claims (6)

The seat on which the seated person sits and
A back plate provided behind the seat and flexed by the load of the seater,
A backrest frame located behind the back plate and supporting the back plate,
An elastic connection portion that extends in the front-rear direction of the seat body and connects the back plate and the backrest frame so as to allow the back plate to bend due to the load of the seated person.
With
The elastic connection portion connects the back plate and the backrest frame by an elastic member that allows the relative movement of the back plate and the backrest frame, and the seated person responds to the bending of the back plate. A chair that bends to the side . The chair according to claim 1, wherein at least a part of the elastic member is housed in a storage space provided inside the backrest frame. The elastic connection portion is connected in the vicinity of the left and right ends of the back plate, and the connection portion between the elastic connection portion and the back plate bends toward the seater according to the bending of the back plate. The chair according to claim 1 or 2. The chair according to any one of claims 1 to 3, wherein the elastic member is a leaf spring. The chair according to any one of claims 1 to 4, which is provided so as to be movable in the accommodation space and further includes a deformation regulating portion that regulates the movable range of the elastic member. The elastic connection portion is arranged at a height near the waist of the seated person, and the back plate and the back plate are above the elastic connection portion so as to allow the back plate to bend due to the load of the seated person. The chair according to any one of claims 1 to 5, further comprising an elastic connecting portion for connecting to the backrest frame.

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