JP4867022B2 - Chair headrest - Google Patents

Description

  The present invention relates to a headrest of a chair.

Office chairs used in offices are often accompanied by a headrest that supports the head of the seated person. The headrest of this type of chair is usually fixed to the upper end of the backrest (see, for example, the following patent document).
JP 2002-119371 A

  By the way, in everyday life, you often turn around while sitting on a chair, extend your hand, or twist your body. There are various opportunities such as being called by other people and facing them, picking up the back items, loosening the body with stretching, etc. It was not thought of to do.

  More specifically, when turning around, stretching hands, or twisting the body while sitting on a chair, the left or right half of the body is relatively lowered. However, in the existing chair, the frame elements on both the left and right sides are rigidly connected to each other via a horizontal member, and these frame elements move back and forth integrally, so only the left side of the backrest surface or only the right side Cannot be displaced backwards. Therefore, it is impossible to change the backrest surface following the movement of the seated person, such as turning back, leading to the restriction of the seated person's work.

  Focusing on the above problems, consider realizing a chair that can change the shape of the backrest surface in a three-dimensional manner following a movement such as turning back while a seated person is seated. At that time, the headrest must be able to follow the deformation of the backrest, but the headrest of a conventional chair makes it possible to deform the headrest itself even if consideration is given to cushioning when supporting the head of the seated person This idea did not exist.

  An object of the present invention is to enable the headrest to follow the deformation operation of the chair body including the backrest.

  In order to solve the above-mentioned problems, the headrest of the chair is formed from a deformable head support part that constitutes a support surface that supports the head of the seated person, and the head support part that is present on both left and right sides of the head support part And has a support part that supports the head support part by connecting to the chair body, and the one support part is relative to the other support part through deformation of the head support part. Can be displaced. If it is such, it is possible to follow the deformation | transformation operation | movement of a chair main body.

  In particular, the headrest according to the present invention includes a backrest that supports the upper portion of the backrest surface by a plurality of frame elements spaced apart in the width direction, and each frame element can be moved back and forth independently of each other. It is applied to the chair of a certain aspect. Then, the headrest is connected to the chair main body by connecting one supporting member to one frame element and the other supporting member to the other frame element. Thereby, the width dimension of a headrest can be taken large and it is effective in the improvement of a usability | use feeling and fostering a high-class feeling.

  In order to contribute to the shape retention of the headrest and firmly support the head of the seated person, it is necessary to configure the head support portion with a thin plate-like core material that is flexible while expanding in the width direction. preferable.

  By forming a missing part in the middle part of the core material, the rigidity of the left and right side ends is relatively increased while giving flexibility to the middle part, and one end of the member serving as a support part is attached to the left and right side ends. If it is made to wear | wear, the intensity | strength of the connection structure with respect to the chair main body of a headrest can be raised, ensuring necessary and sufficient flexibility. Here, the deficient portion is a concept that collectively refers to slits, cutouts, through-holes, meat stealers (concave portions that do not penetrate, thinning the target portion), and the like.

  Appearance that the backrest and the headrest are integrated if the upholstery covering the head support part and the support part is shared with the upholstery constituting the backrest surface in the backrest of the chair body And enhance the beauty and style of furniture.

  According to the present invention, the headrest can be made to follow the deformation operation of the chair body.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the chair according to this embodiment includes a leg 4, a base 2 supported by the leg 4, a seat 3 disposed on the base 2, and a horizontal support shaft 16. The headrest H is attached to a chair body C having a backrest 1 pivotally attached to the base body 2, and a synchro-rocking operation in which the seat 3 and the backrest 1 tilt in conjunction with each other is possible.

  More specifically, the leg 4 includes a leg blade 41 on which a plurality of casters are mounted, and a leg column 42 that rises substantially vertically from the center of the leg blade 41. The leg blade 41, the leg column 42, The leg struts 42 can be projected and retracted vertically by extending and contracting a gas spring (not shown) interposed therebetween.

  The base body 2 is fixed to the upper end of the leg column 42, and the height positions of the seat 3 and the backrest 1 can be adjusted through the operation of projecting and retracting the leg column 42. An elastic biasing mechanism (not shown) for biasing the backrest 1 rotating around the horizontal support shaft 16 forward, a fixing mechanism (not shown) for fixing the locking angle of the backrest 1, etc. Built in. The elastic urging mechanism elastically urges the back frame 11 by mounting a coil spring or a gas spring.

  The seat 3 is formed by mounting a cushion body 32 that forms a seating surface on a seat receiver 31. The front end portion of the seat 3 is supported so as to be slidable in the front-rear direction with respect to the base body 2, and the rear end portion of the seat 3 is connected to the lower frame portion 13 of the back frame 11 described below via a hinge (not shown). Are attached.

  The backrest 1 is obtained by stretching a tension member 12 that forms a backrest surface S on the front surface of the back frame 11. The back frame 11 includes a lower frame portion 13 connected to the base body 2 so as to be rotatable about a horizontal support shaft 16, and an upper frame portion 14 connected to the upper end of the lower frame portion 13 via a hinge 17. And a reaction force frame portion 15 for supporting the upper frame portion 14 from the rear.

  The lower frame portion 13 is formed by connecting left and right lower frame elements 131 a and 131 b that are spaced apart in the width direction to each other by a rigid horizontal member 132. Both the lower frame elements 131a and 131b and the rigid horizontal member 132 are, for example, metal rigid bodies. The lower frame elements 131a and 131b have a substantially L-shape that extends rearward from the front end where the horizontal support shaft 16 is located in side view and is bent upward at the rear end.

  The upper frame portion 14 is formed by connecting left and right upper frame elements 141 a and 141 b that are spaced apart in the width direction to each other by an elastic horizontal member 142. The upper frame elements 141a and 141b are, for example, metal rigid bodies, while the elastic horizontal member 142 is, for example, an elastic body made of resin. The upper frame elements 141a and 141b have an arcuate shape that extends upward from the lower end where the side view hinge 17 is located while gently curving so as to be somewhat recessed backward, and bulges forward again in the vicinity of the upper end.

  The reaction force frame portion 15 includes the same number of reaction force frame elements 151a and 151b that support the upper frame elements 141a and 141b. One end portions of the reaction force frame elements 151a and 151b are connected to the back surfaces of the upper frame elements 141a and 141b, and the other end portions are connected to the downward surfaces of the lower frame elements 131a and 131b. The reaction force frame elements 151a and 151b are made of an elastic body made of a resin having the same quality as the elastic horizontal member 142, for example. The reaction force frame elements 151a and 151b extend substantially along the frame elements 131a and 131b and the upper frame elements 141a and 141b in a side view, and have a substantially L shape.

  The periphery of the hinge 17 that pivotally attaches the lower frame elements 131a and 131b and the upper frame elements 141a and 141b to each other, specifically, from the rear end to the vicinity of the upper end of the lower frame elements 131a and 131b and the lower ends of the upper frame elements 141a and 141b. In the vicinity range, a curved shape is formed such that the front surface of the side view frame bulges forward. As already described, also in the vicinity of the upper ends of the upper frame elements 141a and 141b, a curved shape is formed such that the front surface of the side view frame bulges forward. Accordingly, the tension member 12 is stretched so as to be bridged over the curved portions of the lower frame elements 131a and 131b and the upper frame elements 141a and 141b.

  The tension member 12 is mainly composed of a tension fabric 121 that is rich in elasticity. The upholstery 121 is made of, for example, a double raschel mesh made of synthetic fiber and further knitted with elastic yarn such as an elastomer yarn (specifically, a surface fabric and a back fabric of a mesh fabric that can be expanded and contracted are three-dimensional by double raschel knitting. ) And has both strength and cushioning properties.

  The upper side and the left and right sides of the upholstery 121 are retained by the backup material 122. As shown in FIG. 7, in the backup material 122, the vertical frames 122a and 122b and the horizontal frame 122c connecting the vertical frames 122a and 122b form a three-sided frame shape or a four-sided frame shape when viewed from the front, A thin plate body made of, for example, resin that can be bent and deformed in the front-rear direction, in particular, the left and right sides of the stretch fabric 121 are prevented from bending inward, and the stretch fabric 121 is kept stretched. The backup material 122 in the illustrated example has a substantially three-sided frame shape in front view in which the upper ends of the left and right vertical frames 122a and 122b are connected to each other via a horizontal frame 122c.

  The upper end portion of the backup material 122 is supported on the upper end portion of the back frame 11. In the present embodiment, through holes 122x are made in the upper ends of the vertical frames 122a and 122b of the backup material 122, and fastening devices 191 such as screws or pins are inserted into the through holes 122x, and the upper ends of the upper frame elements 141a and 141b. It is fixed to the part. On the other hand, the lower end portion of the backup material 122 is supported by the lower end portion of the back frame 11. In the present embodiment, long holes 122y extending in the vertical direction are formed in the lower ends of the vertical frames 122a and 122b of the backup material 122 and portions slightly below the middle, and fasteners such as screws or pins are provided in the long holes 122y. 192 is inserted and fixed to the lower end and the upper end of the lower frame elements 131a and 131b. The upper end portion of the backup material 122 is fixed to the upper frame elements 141a and 141b, but the lower end portion can slide up and down with respect to the lower frame elements 131a and 131b.

  Between the upper end portion of the back frame 11 and the vicinity of the hinge 17 is curved so as to be recessed rearward in a side view, and an intermediate portion of the vertical frames 122a and 122b is provided with a room where it can bend and deform backward. The elastic horizontal member 142 forming the upper side of the back frame 11 is also curved so as to be recessed rearward in plan view, and provides a room for the horizontal frame 122c to bend and deform backward.

  The upper part of the tension member 12 that forms the backrest surface S is mounted and supported on the left and right upper frame elements 141a and 141b, and the lower part is mounted and supported on the left and right lower frame elements 131a and 131b. When installing the tension fabric 121 on the back frame 11, the left and right side edges of the tension fabric 121 are attached to the vertical frames 122 a and 122 b of the backup material 122. Specifically, as shown in FIG. 7 and FIG. 9, concave grooves 122z are formed in the peripheral end surface of the backup material 122, that is, the outer end surfaces of the left and right vertical frames 122a and 122b, respectively, and the tension 121 is formed in the concave groove 122z. The two edges 121x are fitted and locked. Note that, for example, a resin-made edge material having a long thin plate shape is attached to the edge ends 121x and 121s of the stretch fabric 121 in advance (by sewing, adhesion, welding, or the like). Further, the lower edge of the tension fabric 121 is fixed to a predetermined portion of the lower frame portion 13. In the illustrated example, a bracket 121 y is attached to the lower edge of the tension fabric 121, and the bracket 121 y is fixed to the rigid horizontal member 132 of the lower frame portion 13 using a bolt 193 or the like. Further, the uppermost portion of the upholstery 121 extends upward from the upper edge of the back frame 11. This uppermost portion covers the headrest H as will be described later.

  Generally speaking, a backup material 122 is disposed on the front surface of the back frame 11, and a tension fabric 121 is disposed on the front surface of the backup material 122. At this time, the backup material 122 acts as a leaf spring, and pushes the stretched fabric 121 forward to project it. The upper end portion and the lower end portion of the upholstery 121 are respectively fixed to the upper and lower end portions of the back frame 11. The upper end portion of the tension fabric 121 is indirectly fixed to the upper frame elements 141a and 141b via the backup material 122, and the lower end portion of the tension fabric 121 is directly fixed to the lower frame elements 131a and 131b without the backup material 122. Has been.

  The chair of the present embodiment can perform a synchro-rocking operation in which the seat 3 and the backrest 1 are tilted in conjunction with each other. As shown in FIG. 4, in the synchro-rocking operation, the backrest 1 tilts back and forth as the entire back frame 11 rotates around the horizontal support shaft 16. At the same time, the rear end of the seat 3 swings up and down in conjunction with the back frame 11, and the front end of the seat 3 slides back and forth.

  In addition, the chair of the present embodiment follows only the left half of the upper part of the backrest surface S by following the movement of turning back, stretching the hand, or twisting the body while the seated person is seated, or the right Only the half part can be displaced backward. In the upper frame portion 14 that supports the upper portion of the backrest surface S, the upper frame elements 141a and 141b that make a pair on the left and right sides move back and forth independently of each other. That is, the left upper frame element 141a is connected to the left lower frame element 131a via the hinge 17, and the right upper frame element 141b is connected to the right lower frame element 131b via the hinge 17, The frame elements 141a and 141b can be individually rotated.

  As shown in FIG. 5, when the upper frame elements 141a and 141b are tilted backward around the hinge 17, the tension member 12 contacts the curved portions of the lower frame elements 131a and 131b and the upper frame elements 141a and 141b. As the area gradually increases, the separation distance between the upper end portion and the lower end portion of the back frame 11 increases, so that the tension fabric 121 extends vertically while increasing the tension. At the same time, the lower end portion of the backup material 122 is relatively displaced in the vertical direction with respect to the lower frame elements 131a and 131b within the dimension range of the long hole 122y. At the same time, the reaction force frame elements 151a and 151b are deformed so as to widen the angle to accumulate the reaction force, and elastically bias the front frame elements 141a and 141b back to the original positions, that is, forward.

  If one of the upper frame elements 141a (141b) is displaced in the front-rear direction relative to the other upper frame element 141b (141a), the shape of the backrest surface S is changed as shown in FIG. It can be changed in three dimensions. However, in FIG. 6, the headrest H is not shown for clarity. In this operation, the lower frame portion 13 is not necessarily driven. Since the lower frame elements 131a and 131b that make a pair on the left and right are rigidly connected via the rigid horizontal member 132, the lower frame elements 131a and 131b always move integrally. Therefore, the lower part of the backrest surface S and the part below the seated person's lower back always maintain a constant shape.

  When one of the upper frame elements 141a and 141b moves back and forth relative to the other as the seated person moves, the distance between the left and right upper frame elements 141a and 141b increases. At that time, the elastic horizontal member 142 is elastically deformed to cope with an increase in the separation distance between the upper frame elements 141a and 141b. The elastic horizontal member 142 of the present embodiment connects the upper end portions of the upper frame elements 141a and 141b to each other and is assembled in a curved shape that is recessed backward in plan view. The front and rear thicknesses of the elastic horizontal member 142 are gradually reduced from the both ends connected to the upper frame elements 141a and 141b toward the center in the width direction, and the middle portion is relatively smaller than the both ends. It is easy to deform. This is for avoiding the concentration of the load at the connection point between the upper frame elements 141a and 141b and the elastic horizontal member 142.

  Here, it supplements regarding the connection aspect of upper frame element 141a, 141b and the elastic horizontal member 142. FIG. The upper frame elements 141a and 141b have joint ends protruding at the upper ends that are close to each other at the upper ends, and both ends of the elastic horizontal member 142 are connected to the joint ends. As shown in FIG. 9, a convex portion is formed on one of the joining end portions of the upper frame elements 141a and 141b and both end portions of the elastic horizontal member 142 facing each other (in the illustrated example, the upper frame elements 141a and 141b side). 141x protrudes, and the other side (in the illustrated example, the elastic horizontal member 142 side) is formed with a recess 142x to construct a fitting structure in which the projection 141x is fitted into the recess 142x. Then, the bolts 194 are screwed in from the direction intersecting with the fitting direction, and the peripheral wall of the convex portion 141x and the concave portion 142x is screwed and tightened, so that the joint end portions of the upper frame elements 141a and 141b and the elastic horizontal mount The end of the material 142 is coupled. In the illustrated example, a bolt 194 is screwed in from the front, and the bolt 194 is substantially concealed by a tension member 12 that is stretched on the back frame 11.

  When one of the upper frame elements 141a and 141b moves back and forth relatively with respect to the other, the elastic horizontal member 142 is deformed so as to reduce the curvature and extends the distance between both ends.

  In addition, the load of the seated person received by the backrest surface S acts on the upper frame elements 141a and 141b via the tension member 12, and tries to cause the upper frame elements 141a and 141b to fall inwardly on the hinge 17. Burdening. For the purpose of canceling and reducing such a load, the elastic horizontal member 142 is assembled in a state of exerting an initial elastic force that separates the upper frame elements 141a and 141b in the width direction.

  However, the upper frame elements 141a and 141b on both the left and right sides can be tilted together. In that case, for example, stretching that greatly warps the back of the seated person is possible.

  Incidentally, the lumbar support member 18 can be bridged at a height position corresponding to the back of the upholstery 121 and the waist of the seated person. Even when the seated person leans over the backrest surface S, the region near the waist is supported from behind by the lumbar support member 18 and does not sink back beyond a depth corresponding to the total length of the lumbar support member 18. . Both ends of the lumbar support member 18 are attached to and supported by the left and right vertical frames 122a and 122b of the backup material 122 via an appropriate support structure (not shown). However, it does not prevent the end portions of the lumbar support member 18 from being supported by the left and right upper frame elements 141a and 141b or the lower frame elements 131a and 131b.

  Hereinafter, the headrest H will be described with reference to FIGS. The headrest H of the chair of the present embodiment includes a deformable head support portion 5 that constitutes a support surface that supports the head of the seated person, and the head support portion 5 that is present on both left and right sides of the head support portion 5. Is also connected to the chair main body C via the support part 6 and one support part 6 is changed to the other support part 6 through deformation of the head support part 5. On the other hand, it can be displaced relatively. In this embodiment, since the left and right upper frame elements 141a and 141b in the chair body C move back and forth independently of each other, the headrest H also has a variable shape so as to correspond to the operations of these upper frame elements 141a and 141b. ing.

  The head support portion 5 includes, for example, a hard resin core material as an element. The core material 5 is a thin plate-like member having a shape-retaining property and a curved surface shape that bulges forward in a side view, and forms a defective portion 51 at a required portion to compensate for flexibility and variable shape. It is what. In the present embodiment, slits as a plurality of defect portions 51 extending in the width direction in the middle portion of the core material 5 are formed by being distributed over substantially the entire area in the vertical direction. However, the bottomed groove that does not penetrate the core material 5 rather than the slit 51 that penetrates the core material 5 is not prevented. The outer end of the slit 51 stops inward from the left and right side edges of the core material 5, and the left and right side end portions of the core material 5 not reaching the slit 51 are secured to a certain degree of rigidity. A recess 54 that is recessed forward is formed on the back side of the lower end of the left and right ends, and a through hole 55 is formed in the bottom wall surface.

  In addition, the core material 5 is provided with a vertical beam portion 52 that intersects with the slit 51. The vertical crosspieces 52 are arranged at a plurality of locations separated from the central axis of the core material 5 to the left and right. The vertical crosspiece 52 extends linearly so as to connect the upper edge and the lower edge of the core material 5. A rib (or protrusion) 53 for reinforcement is formed on the back side of the vertical beam portion 52, but such a rib 53 is not essential. The slit 51 divided by the vertical crosspiece 52 is relatively short at the side and relatively long at the center. In other words, it can be said that the amount of the defect portion 51 is relatively small at the side of the core material 5 and relatively large at the center. Thereby, the flexibility of the central part is relatively improved.

  The support part 6 is mainly composed of, for example, a metal connecting member that is separate from the head support part 5. The connecting member 6 is a rigid member obtained by forming a sheet metal material so as to have a substantially square shape when viewed from the side, and has a lower portion bound to the chair body C and an upper portion bound to the core material 5. An insertion hole 61 is formed in the lower part of the connecting member 6, and a screw hole 62 is formed in the upper part.

  The attachment of the headrest H to the chair body C will be described. In this embodiment, a pair of connecting members 6 are arranged on both the left and right sides, one is connected to the left upper frame element 141a and the other is connected to the right upper frame element 141b. 5 is supported. In binding the lower part of the connecting member 6 to the upper frame elements 141a and 141b, the fastener 191 for fixing the vertical frames 122a and 122b of the backup material 122 described above to the upper frame elements 141a and 141b is used. . That is, the lower part of the connecting member 6 is disposed between the upper frame elements 141a and 141b and the vertical frames 122a and 122b, and the fastening device 191 inserted through the through holes 122x of the vertical frames 122a and 122b is used as it is. Is inserted into the through hole 61 and screwed into the nut hole 141s formed in the upper frame elements 141a and 141b to be fastened. Further, when the upper part of the connecting member 6 is bonded to the core material 5, the upper part of the connecting member 6 is disposed in a recess 54 formed on the back side of the core material 5, and a through hole 55 formed in the bottom wall surface of the recess 54. Then, a fastening tool 195 such as a screw is inserted from the front, and is screwed and fastened to the screw hole 62 at the upper part of the connecting member 6 to be fastened.

  Then, the core material 5 and the connecting member 6 are covered with a tension fabric 121. In the present embodiment, the uppermost portion of the upholstery 121 that extends upward from the upper edge of the back frame 11 is used as the skin of the headrest H. Specifically, the uppermost portion of the upholstery 121 is mountain-folded rearward at a height corresponding to the upper edge of the core material 5 of the headrest H, and the left and right side edges of the overlapping part are sutured or welded downward. The bag is opened. Next, after inserting the core material 5 and the connecting member 6 of the headrest H into the bag-like inner side, the tension fabric 121 is fixed in a state where tension is applied downward. That is, the bracket 121y described above is fixed to the rigid horizontal member 132 of the lower frame 13, and the left and right edge ends 121x of the tensioned fabric 121 are fitted into the recessed grooves 122z on the outer end surfaces of the vertical frames 122a and 122b. Stop. Further, the uppermost end 121s of the upholstery 121, that is, the lower end of the portion bent backward to form a bag shape, is fitted into the concave groove 122s formed on the lower end surface of the horizontal frame 122c and locked. Thereafter, in the vicinity of the boundary line between the headrest H and the backrest 1, the overlapping portions before and after the tension fabric 121 are stitched or welded to close the bag.

  According to the present embodiment, the headrest H of the chair is present on both the left and right sides of the head support 5 and the deformable head support 5 that constitutes the support surface that supports the head of the seated person. And a support portion 6 that is connected to the chair body C and supports the head support portion 5. The support portion 5 is deformed so that one support portion 6 is connected to the other. Therefore, it is possible to follow the deformation operation of the chair body C.

  That is, a backrest is provided in which the upper portion of the backrest surface S is supported by a plurality of frame elements 141a and 141b that are spaced apart in the width direction, and the frame elements 141a and 141b can be moved back and forth independently of each other. In the chair of the present embodiment, the headrest H is connected to the chair body C by connecting one supporting member 6 to one frame element 141a and the other supporting member 6 to the other frame element 141b. Yes. In addition, this makes it possible to increase the width of the headrest H, which is effective for improving the feeling of use and fostering a sense of quality.

  Since the head support portion 5 is configured with a thin plate-like core material that is flexible while expanding in the width direction, it contributes to the shape retention of the headrest H and firmly supports the head of the seated person. Will be able to.

  By forming the defect portion 51 in the middle portion of the core material 5, while making the middle portion flexible, the rigidity of the left and right side end portions is relatively increased, and the left and right side end portions are supported by the chair body C. Since one end of the connecting member which is the support portion 6 is attached to the left and right ends of the core material 5, the strength of the connecting structure of the headrest H to the chair body C is ensured while ensuring the necessary and sufficient flexibility. Can be increased.

  Since the upholstery 121 that covers the head support 5 and the support 6 is shared with the upholstery 121 that forms the backrest surface S in the backrest of the chair body C, the backrest and the headrest H are It can give the appearance of being united and enhance the beauty and style of furniture.

  Further, according to the present embodiment, the head support portion 5 that supports the head of the seated person is configured by using a heartwood having a shape retaining property and a curved surface as an element, and the missing portion 51 is provided at a required portion of the heartwood 5. Since the headrest H of the chair supplemented with flexibility and deformability is formed, cushioning properties are given when the head is leaned, and a suitable feeling of use can be provided.

  Since the plurality of slits or bottomed grooves extending in the width direction are formed as the defect portion 51, it is possible to improve the feeling when the seated person leans over the head.

  On the other hand, since the vertical crosspiece 52 extending in the vertical direction and intersecting with the slit 51 (or bottomed groove) is provided, the outer shape of the core material 5 is inadvertently collapsed when the upholstery 121 is covered from above. Can avoid inconvenience.

  The core material 5 of the headrest H is an integrally molded product using a resin material, and the core material 5 is covered with a tension fabric 121, so that it has a simple structure and enhances the beauty and style of furniture. be able to.

  The present invention is not limited to the embodiment described in detail above. For example, in the above-described embodiment, the head support portion 5 is configured by using the core material 5 having a thin plate shape as an element, but the net having flexibility and stretchability in the support portions that are separated from each other on both the left and right sides. In addition, it does not interfere with the aspect of configuring the head support section by bridging a belt or a large number of wires.

  In the above embodiment, the head support portion 5 and the support portion 6 of the headrest H are separate from each other, but it may be considered that they are integrally formed.

  As shown in FIG. 11, a defect 56 may be formed in the vertical beam portion 52 of the core material 5 to reduce the rigidity of the vertical beam portion 52. The defect portion 56 is a slit or a bottomed groove that extends in the vertical direction and is shorter than the vertical dimension of the core material 5, and a plurality of slits 56 and the like are partially disposed on one vertical crosspiece 52. Thereby, the deformation characteristics of the core material 5 can be arranged.

  Or you may form the defect | deletion part 57 which crosses the vertical crosspiece part 52, as shown in FIG. The defect portion 57 is a slit or a bottomed groove extending in the width direction. In the illustrated example, the vertical beam portions 52 are disposed at a plurality of locations on the central axis of the core material 52 and spaced from the central axis to the left and right, and the vertical beam portions 52 are divided into a plurality of vertical portions by the above-described defect portion 57. is doing. Thereby, it can be avoided that only the vertical beam portion 52 gives a locally hard feeling.

  The slit 51 or the bottomed groove formed in the core material 5 is not necessarily extended in the width direction. It is also possible to supplement the flexibility of the core material by forming a plurality of slits or bottomed grooves extending in the vertical direction. In that case, the slit or the bottomed groove may reach the upper edge or the lower edge of the core material 5 as shown in FIG. 13 (if it is a slit, the core material 5 is divided into a plurality of parts, 14 and the upper edge or the lower edge of the core material 5 is not required to reach the upper edge or the lower edge of the core material 5 as shown in FIG. Each part is connected at the upper and lower edges). Forming slits or bottomed grooves extending in the vertical direction is effective for deforming only a part of the core material 5. In turn, if the slit 51 or the bottomed groove extending in the width direction is formed as in the above-described embodiment, the rigidity is reduced over the entire width of the core material 5 and the entire material is easily deformed.

  The curved surface shape of the core material 5 is not limited to a shape that bulges forward in a side view. It may have a shape that bulges rearward in a side view or frontward / rearward in a plan view, or may have a shape in which a central portion bulges forward / rearward from the peripheral portions of the four sides.

  Other specific configurations of the respective parts are not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

The perspective view which shows the chair of one Embodiment of this invention. The side view of the chair. The rear view of the chair. The side view which shows the synchro-rocking operation | movement of the chair. The side view which shows the state which displaced the upper frame element of the chair back. The top view which shows the backrest surface deformation | transformation operation | movement of the chair. The principal part disassembled perspective view which shows the tension place of the same chair, a support body, a lumbar support member, and a headrest. The principal part disassembled perspective view which shows the core material and connection member of the headrest of the chair. The principal part flat end view explaining the attachment structure of the headrest and tension fabric of the chair. The principal part side sectional view explaining the attachment structure of the headrest and tension fabric of the chair. The principal part front view which shows one of the modifications of this invention. The principal part front view which shows one of the modifications of this invention. The principal part front view which shows one of the modifications of this invention. The principal part front view which shows one of the modifications of this invention.

Explanation of symbols

C ... Chair body 121 ... Zhangji 141a, 141b ... Frame element (upper frame element)
H ... Headrest 5 ... Head support (heart material)
51 ... Defect (slit)
52 ... Vertical beam 56, 57 ... Defect (slit)
6 ... Supporting part (connecting member)

Claims (4)

A deformable head support that constitutes a support surface that supports the head of the seated person;
It exists on both the left and right sides of the head support part, has rigidity than the head support part, and comprises a support part that supports the head support part connected to the chair body,
A headrest of a chair that can be displaced relative to the other support part through deformation of the head support part ,
The chair body includes a backrest that supports the upper portion of the backrest surface by a plurality of frame elements that are spaced apart from each other in the width direction, and each frame element can be moved back and forth independently of each other. ,
One of支桿portion on one frame element, chair headrest connected respectively other支桿portion to another frame element. The headrest of the chair according to claim 1, wherein the head support portion includes a thin core material having flexibility while expanding in the width direction . The rigidity of the left and right side end portions is relatively increased while providing flexibility to the intermediate portion by forming a defect portion in the intermediate portion of the core material,
The headrest of the chair according to claim 2, wherein one end of a member which is a support portion is attached to both left and right end portions . The headrest of the chair according to claim 1, 2 or 3, wherein the upholstery covering the head support part and the support part is shared with the upholstery constituting the backrest surface in the backrest of the chair body .

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