JP2018007727A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair backrest improved in the followability to the position of a seating person by a simple construction.SOLUTION: A chair comprises: a seat body, on which a seating person is seated; a back board disposed at the back of the seat body and warped by the load of the seating person; a backrest frame positioned at the back of the back board for supporting the back board; and an elastic connection part connecting the back plate and the backrest frame for allowing the warpage of the back plate by the load of the seating person. Moreover, the elastic connection part connects the back board and the backrest frame by an elastic member for allowing the relative movements of the back plate and the backrest frame.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a chair.

  Conventionally, there has been proposed 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 (for example, Patent Document 1). In this chair, a pair of left and right engaging portions made of a cylindrical body in the vertical direction with at least a lower surface opened on the rear surface of the back plate are integrally projected rearward, and a backrest frame is provided on the engaging portion. A pair of left and right engaging portions provided on the left and right sides are engaged with each other so as to be relatively rotatable about the vertical axis.

JP 2012-176276 A

  For example, when engaging each of the engaging portions projecting on the left and right sides of the back plate and the engaging portions provided on the left and right sides of the backrest frame so as to be relatively rotatable, respectively, The rotation of the engaging portion and the locking portion is restored to the original state. Further, for example, by using a spring member in addition to the prior art, a restoring force can be applied to the left and right rotation shafts, respectively. However, in such a configuration, it is generally difficult to reduce the size of the rotation mechanism, which may be a restriction on the design of the chair. Therefore, it is desirable to realize a deformation mechanism that follows a change in the posture of the seated person with a simple configuration that can be reduced in size.

  In view of the above, an object of the present invention is to provide a backrest of a chair with improved followability to the posture of a seated person with a simple configuration.

  The chair according to the present invention includes a seat on which a seated person sits, a back plate provided behind the seat body, which is bent by the load of the seated person, and a backrest frame which is located behind the back plate and supports the back plate. And an elastic connecting 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. The elastic connection portion connects the back plate and the back frame by an elastic member that allows relative movement between the back plate and the back frame.

  In this way, by allowing relative movement between the back plate and the backrest frame by the elastic member, it is possible to improve the followability of the back plate with respect to the posture of the seated person.

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

In addition, the elastic connection portion is connected to the vicinity of the left and right end portions of the back plate, respectively, and the connection portion between the elastic connection portion and the back plate is displaced to the seated person side according to the bending of the back plate. Good. By connecting the elastic connecting portions in the vicinity of the left and right end portions of the back plate, the elastic connecting portions are easily deformed by following an external force applied to all portions of the back plate.

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

  Moreover, you may make it further provide the deformation | transformation control part which is provided in the accommodation space so that a movement is possible, and controls the movable range of an elastic member. If it does in this way, the movable range of an elastic member will be controlled and the degree to which a back board will change can be adjusted now.

  In addition, the elastic connecting portion is disposed at a height near the waist of the seated person, and the back plate and the backrest are also provided above the elastic connecting part so as to allow the back plate to bend due to the load of the seated person. You may make it further provide the elastic connection part which connects a flame | frame. By increasing the number of elastic connecting portions, it is possible to improve the follow-up performance of the shape of the back plate with respect to changes in the posture of the seated person.

  ADVANTAGE OF THE INVENTION According to this invention, the backrest of the chair which improved the followable | trackability to a seated person's attitude | position by simple structure can be provided.

It is the perspective view which looked at the chair concerning this embodiment from the front side upper part. It is the perspective view which looked at the chair concerning an embodiment from the back side lower part. It is the perspective view which looked at the backrest frame and the elastic connection part from the front side upper part. It is the perspective view which looked at the circumference of the back board support part and elastic connection part of a backrest frame from the front side upper part. It is the perspective view which looked the circumference | surroundings of the back-plate support part and elastic connection part of a backrest frame from the back side lower side. It is the disassembled perspective view which looked the circumference | surroundings of the back-plate support part and elastic connection part of a backrest frame from the front side upper direction. It is the disassembled perspective view which looked around the back board support part and elastic connection part of a backrest frame from the back side lower side. It is a front view of the back plate support part periphery of a backrest frame. It is the perspective view which looked at the circumference of the back board support part and elastic connection part of a backrest frame which shows the state where the slider was slid back from the front side upper part. It is the perspective view which looked the circumference | surroundings of the back board support part and elastic connection part which do not display a back board fixing | fixed part from a front side upper part which shows the restriction release state. It is the perspective view which looked the circumference | surroundings of the back-plate support part and elastic connection part which show the regulation state which does not display a back-plate fixing | fixed part from the front side upper direction. It is a top view around the back board support part and elastic connection part of a backrest frame. It is a top view for demonstrating a deformation | transformation of an elastic connection part periphery in case a load is applied equally to right and left toward back with respect to a backplate in a regulation cancellation | release state.

  Next, an embodiment of a chair according to the present invention will be described based on the drawings. In addition, embodiment described below is the illustration for implementing this invention, and this invention is not limited to the aspect demonstrated below.

<Configuration>
Drawing 1 is a perspective view which looked at chair 1 concerning this embodiment from the front side upper part. Moreover, FIG. 2 is the perspective view which looked at the chair 1 which concerns on this embodiment from the back side lower side. In the following description, for the sake of 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 viewed from the seated person are the left and right sides, respectively. Call. As shown in FIGS. 1 and 2, the chair 1 according to this embodiment includes a leg 2, a shaft member 3, a cradle 4, a seat body 5, a back plate 6, a backrest frame 7, an elastic connection portion 8, an armrest 9, A reclining mechanism 10 is provided.

  The leg 2 supports other components of the chair 1 such as the cradle 4 and the seat body 5 via the shaft member 3. The leg 2 consists of five legs arranged radially, and a caster is connected to the tip of each leg. The leg 2 according to the present embodiment is an example, and various existing legs can be used as appropriate. A shaft member 3 extending in the vertical direction is connected to the center of the leg 2 in plan view.

  The shaft member 3 supports the cradle 4 and the seat body 5 together with the legs 2. The shaft member 3 includes a gas cylinder, a hydraulic cylinder, and the like. Then, by operating a lever or the like (not shown) provided on the side surface of the cradle 4, the length of the shaft member 3 can be changed and the height of the seat body 5 can be adjusted. The shaft member 3 may have a simpler configuration such as a pipe whose length does not change. 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 cradle 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 is substantially square in plan view and has a sufficient area for the seated person to sit down. The seat body 5 may be circular, polygonal, or other shapes. A back plate 6 is provided on the back 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 a region in contact with the waist of the seated person is convex toward the front side (that is, the seated person side). The back plate 6 has a resin mesh structure, for example, and is configured to bend when the seated person puts his / her weight. The plurality of holes constituting the mesh of the back plate 6 is a rhombus elongated in the vertical direction, but may be a rectangle or an ellipse elongated in the vertical direction, and the shape of the hole is not particularly limited. The back plate 6 may be square, circular, trapezoidal, or other shapes, and the height of the back plate 6 is not particularly limited. A back 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 seen from above the front side. The backrest frame 7 is provided on the back side of the back plate 6 with a space from the back plate 6. The back frame 7 includes two vertical frames 71 that are located in the vicinity of both ends in the width direction of the back plate 6 and extend in the vertical direction, and a horizontal frame 72 that extends in the horizontal direction and connects the two vertical frames 71. And have. The vertical frame 71 is bent so that a portion corresponding to the height of the lumbar portion of the seated person is generally convex in the front view. In other words, the vertical frame 71 is bent along the back plate 6 in a 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, thereby improving the rigidity of the backrest frame 7. Further, a back plate fixing portion 73 that is bent toward the front side and is fixed to the vicinity of the edge portion of the back plate 6 is provided near the upper end of each vertical frame 71. Further, a back plate support portion 74 that extends further toward the front side and supports the vicinity of the edge portion of the back plate 6 via the elastic connection portion 8 in the vicinity of the portion that protrudes most to the front side of each vertical frame 71. Is provided. In addition, a base 75 that extends below the seat body 5 and is 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 periphery of the back plate support portion 74 and the elastic connection portion 8 of the back frame 7 as viewed from the front side upper side. FIG. 5 is a perspective view of the periphery of the back plate support portion 74 and the elastic connection portion 8 of the back frame 7 as seen from the lower side on the back side. 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 back frame 7 as viewed from the upper front side. FIG. 7 is an exploded perspective view of the periphery of the back plate support portion 74 and the elastic connection portion 8 of the back frame 7 as viewed from the lower back side. 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 is symmetrical with respect to the back plate support portion 74 and the elastic connection portion 8. have.

  The back plate support portion 74 includes an elastic connection portion accommodation space 741 that extends from the vertical frame 71 and has an opening in the extending direction, a wall surface 742 of the elastic connection portion accommodation space 741, and a wall surface 742 along the extension direction. A slit 743 provided in a straight line in a part thereof, and a bolt hole 744 into which a bolt or a spring pin for fixing the elastic connecting portion 8 is inserted. The extending direction is the front of the chair 1 and is the direction in which the back plate 6 is positioned when viewed from the back frame 7.

  The elastic connecting portion 8 includes an elastic member, and is deformed by receiving an external force and has a restoring force for restoring to a predetermined shape. A part of the elastic connecting portion 8 is accommodated in the elastic connecting portion accommodating space 741 and connected to the back side of the back plate 6, and the back plate 6 due to a load when the seated person leans against the back plate 6. It deform | transforms so that bending of may be permitted. Specifically, the elastic connection portion 8 includes 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 plate spring 83 is a plate-shaped metal member having a predetermined elastic force. In the present embodiment, the two large-area surfaces of the leaf spring 83 are substantially directed left and right, and the longitudinal direction of the leaf spring 83 is arranged along the depth direction (front-rear 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 so that the leaf spring 83 and the back plate fixing portion 81 are Are combined. In addition, a fixing hole 832 is provided on the other end side behind the leaf spring 83 to be fixed in the elastic connection portion accommodating space 741 of the back plate support portion 74 by a bolt or a spring pin. The part is accommodated in the elastic connection part accommodating space 741. In addition, the elastic connection portion accommodating space 741 has an area in which the leaf spring 83 can be elastically deformed. By the elastic deformation of the leaf spring 83, relative movement between the back plate 6 coupled to the back plate fixing portion 81 and the back frame on the fixing hole 832 side is allowed.

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

FIG. 8 is a front view of the periphery of the back plate support portion 74 of the backrest frame 7. 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) fits, and a deformation restriction portion 821 of the slider 82 (not shown in FIG. 8). And a second step portion 7412 in which the shape of the cross section is accommodated. 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. Therefore, the rotation of the leaf spring 83 around the fixing hole 832 is restricted. In addition, a groove portion 7421 that substantially matches the size of the operation portion 822 in the vertical direction is provided on the outside of the wall surface 742 and on the portion where the operation portion 822 of the slider 82 is located. The groove portion 7421 is formed with an equal width along the depth direction in which the slit 743 extends, and functions as a guide for defining 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 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 restriction release state in which the restriction of deformation of the elastic connecting portion 8 (specifically, the leaf spring 83) is released. The state shown in FIG. 4 is a state in which the slider 82 is slid forward, and is a restricted state in which the 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 a deregulated state, where the back plate fixing portion 81 is not displayed for the sake of convenience, as seen from above the front side. Similarly, FIG. 11 is a perspective view in which the back plate support portion 74 and the elastic connection portion 8 in a restricted state are viewed from above the front side, and the back plate fixing portion 81 is not displayed for convenience. In the restriction release state of FIG. 10, the deformation restriction portion 821 is located behind the elastic connection portion accommodating space 741, and the front end portion of the leaf spring 83 is the inner side of the chair 1 as indicated by the one-dot chain line arrow. Can bend toward 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 restricted state of FIG. 11, the deformation restricting portion 821 is positioned in front of the elastic connection portion accommodating space 741, and closes the space for the leaf spring 83 to be deformed (that is, restricting deformation). ). In addition, the slider 82 is adjusted to an extent that the elastic connecting portion 8 is allowed to be deformed by moving the slider 82 to an arbitrary position between the restricted state shown in FIG. 4 and the restricted state shown in FIG. 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 back frame 7. A front end portion of the back plate support portion 74 and a rear end portion of the back plate fixing portion 81 of the elastic connection portion 8 are curved surfaces. Specifically, the front end portion of the back plate support portion 74 and the rear end portion of the back plate fixing portion 81 are on the back plate support portion 74 side of the leaf spring 83 (that is, an elastic member) in plan view. It has an arcuate curved shape that is substantially centered on the fixed part. That is, the tip of the back plate support portion 74 has a shape along the direction in which the plate spring 83, which is an elastic member, is deformed. Therefore, when the leaf spring 83 is deformed, the back plate fixing portion 81 moves substantially along the curved shape described above, and the back plate fixing portion 81 and the back plate support portion 74 do not interfere with each other.

<Action>
FIG. 13 is a plan view for explaining deformation around the elastic connecting portion 8 when a load is applied to the back plate 6 evenly in the left-right direction in the restriction release state. Note that FIG. 13 will be described with reference to front, rear, left, and right viewed from the seated person. 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 that has been deformed by the load. Show. When a seated person is seated and takes a rearward tilting posture, a load in the rear direction acts on the back plate 6, and the back plate 6 bends so that the back side swells.

  At this time, as indicated by arrows in FIG. 13, the left and right elastic connection portions 8 bend toward the back plate 6 side (that is, the front side) toward the inside of the chair 1 (that is, the seated person side). On the other hand, when the seated person takes a forward leaning posture and moves away from the back plate 6, no external force acts on the back plate 6, and the restoring force of the leaf spring 83 (not shown in FIG. 13) together with the restoring force of the back plate 6. 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 springs 83) provided on the left and right sides. Deforms following the person's posture.

  Moreover, the armrest 9 of FIG.1 and FIG.2 is provided toward the left-right upper direction of the seat 5 from the receiving stand 4. As shown in FIG. The armrest 9 has a substantially horizontal surface at the upper end, and a seated person can rest on the elbow. The shape of the armrest 9 is not limited to that illustrated in FIGS. 1 and 2, and various shapes can be employed.

  1 and 2 is connected to a cradle 4 and a back frame 7, and the back frame 7 and the back plate 6 are inclined backward by a mechanical, gas cylinder, hydraulic cylinder, or other mechanism. Can be made. Various existing mechanisms can also be adopted for the reclining mechanism 10.

<Effect>
The chair 1 according to the present embodiment includes the elastic connection portion 8 so that the relative movement between the back plate 6 and the backrest frame 7 is allowed. Specifically, the waist portion of the back plate 6 connected to the back frame via the elastic connection portion 8 flexes flexibly, and the back plate 6 deforms following the posture of the seated person. In addition, by adopting an elastic member such as a leaf spring 83, it is generally easier to reduce the size than when employing a mechanism that deforms, for example, around a rotation shaft. Further, at least a part of the leaf spring 83 of the elastic connection portion 8 is accommodated in an elastic connection portion accommodation space 741 provided in the backrest frame 7 that supports the back plate 6, so that the deformation mechanism can be seen in appearance. It has become difficult. In this respect, for example, it can be said that the present invention can be applied to various designs as compared with a case where a mechanism that deforms around a rotation axis is employed. Further, by moving the position of the slider 82, the degree to which the elastic connecting portion 8 is allowed to be deformed according to the load on the back plate 6 can be adjusted according to the preference of the seated person.

<Modification>
In the above-described embodiment, the elastic connecting portions 8 are provided one by one at the height around the waist of the seated person, but more elastic connecting portions 8 are provided between the back plate 6 and the back frame 7. It may be. For example, the back frame 7 may support the back plate 6 via the elastic connection 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 following the various postures of the seated person more flexibly.

  Further, the elastic connecting portion 8 may not have the slider 82. In this case, the deformation allowable amount cannot be adjusted, but the other effects described in the embodiment can be obtained similarly.

  Further, the leaf spring 83 may be formed of resin or the like instead of metal. Moreover, the shape is not limited to a plate shape, and various shapes having elasticity can be employed.

  As mentioned above, although embodiment of this invention and the modification were demonstrated, the chair which concerns on this invention is not restricted to these, These structures can be combined as much as possible.

DESCRIPTION OF SYMBOLS 1 Chair 2 Leg 3 Shaft member 4 Stand 5 Seat body 6 Back board 7 Back frame 71 Vertical frame 72 Horizontal frame 73 Back board fixing part 74 Back board support part 741 Elastic connection part accommodation space 8 Elastic connection part 81 Back board fixing part 82 Slider 821 Deformation restriction part 822 Operation part 83 Leaf spring 9 Armrest 10 Reclining mechanism

Claims (6)

A seat on which a seated person sits,
A back plate provided behind the seat body and bent by the load of the seated person;
A back frame that is located behind the back plate and supports the back plate;
An elastic connecting portion for connecting the back plate and the back frame so as to allow the back plate to bend due to the load of the seated person;
With
The elastic connecting portion connects the back plate and the back frame by an elastic member that allows relative movement between the back plate and the back frame. The chair according to claim 1, wherein at least a part of the elastic member is accommodated in an accommodating space provided inside the backrest frame. The elastic connection portions are respectively connected in the vicinity of the left and right end portions of the back plate, and a connection portion between the elastic connection portion and the back plate is displaced toward the seated person 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 as described in any one of Claim 1 to 4 further provided with the deformation | transformation control part which is provided in the said accommodation space so that a movement is possible, and controls the movable range of the said elastic member. The elastic connecting portion is disposed at a height near the waist of the seated occupant, and also above the elastic connecting portion so as to allow the back plate to bend due to the load of the seated occupant. The chair according to any one of claims 1 to 5, further comprising an elastic connection portion that connects the backrest frame.

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