JP2013236768A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair which permits a handle to be arranged in a position facilitating its holding without being restricted by design or structural design.SOLUTION: A chair 1 includes a backrest 3, and a chair body 2 having a back supporting structure 23 rockably supporting the backrest 3. The backrest 3 has an exterior material and a back shape retaining structure 31 holding the exterior material. The back shape retaining structure 31 is directly provided with a handle 5.

Description

  The present invention relates to a rockable chair.

  Conventionally, as this type of chair, a chair including a backrest and a chair body having a back support structure that supports the backrest so as to be able to perform a locking operation is known (for example, Patent Document 1). See).

  However, the conventional one is provided with a connecting portion extending to the left and right that can be used as a handle on a back support structure such as a back support rod or a back frame exposed to the outside. Therefore, if the handle is placed near the upper end of the backrest that is easy for the user to grasp, it is necessary to extend the back support structure to the top of the backrest. There is a problem that it is easy to receive.

Japanese Patent No. 4197045

  An object of this invention is to provide the chair which can be arrange | positioned in the position which is easy to hold a handle in the state which is hard to receive the restrictions on design or structural design.

  The present invention employs the following configuration in order to solve the above-described problems. That is, the chair according to the present invention comprises a backrest and a chair body having a back support structure that supports the backrest so as to be able to perform a locking operation, and the backrest includes an exterior. And a back support structure for holding the exterior material, and a handle is directly provided on the back support structure.

  Here, the “back support structure” may be any structure as long as it supports the backrest so as to be able to perform a locking operation. And an outer shell having

  Further, the “back-holding structure” may be any member as long as the shape of the backrest is maintained within a certain range. For example, the back inner shell, the back frame, Includes a back frame for shape retention.

  Furthermore, the “exterior material” is a shell or so-called resin mesh having moderate rigidity and elasticity, in addition to those attached to the structure for back support, such as cushions and upholstery. The structural body may be integrally formed.

  In addition, “directly” refers to an interposer that extends outward from the back support structure regardless of whether the back support structure and the handle are formed integrally or separately. A handle provided on an object, specifically, a leg of a mounting member such as a headrest or a hanger whose base end is attached to the back support structure and whose distal end extends above the back support structure The purpose is to exclude those that have handles.

  If it is such, since the structure for back support shape has extended to the upper part of the backrest, a handle can be attached reasonably compared with the case where a handle is attached to the said structure for back support. In other words, it is possible to place the handle at a position where it is easy to hold the handle in a state where it is difficult to be restricted by design or structural design.

  The handle includes a gripping member that can be gripped from the outside, an arm portion that extends forward from the gripping member, and an attachment portion that extends downward from the base end portion of the arm portion, and is spaced vertically. It is attached to the structure for back support shape through a plurality of fastening devices arranged with an opening, and the attachment portion is used for the back support shape using at least one of the fastening devices. Those fixed to the structure are preferred.

  Here, the “base end portion” is a concept including the base end of the arm portion and the peripheral portion of the base end.

  The handle is constructed between left and right attachment parts, an arm part extending rearward from both attachment parts, a gripping member constructed between the distal ends of the arm parts, and a base end of the arm part. The arm portion, the gripping member, and the blindfold member are respectively continuous with the outer surface of the outer shell that is attached to the back surface of the inner shell that is the back support structure. It is preferable to have an outer surface.

  A preferred embodiment of the backrest includes a cushion and an inner shell that is the back support structure for holding the cushion from the back side.

  The backrest is provided with a cushion and an inner shell that holds the cushion from the back side, and the attachment portion rear surface of the handle is formed from at least one of a stretched ground, an outer shell, and a partial cover member. What is concealed with an exterior material is preferable.

  Further, as another preferred aspect of the handle, the left and right attachment portions are attached to the inner shell that is the back support structure through a fastening tool, and the backrest is Examples include a cushion, an inner shell that holds the cushion from the back side, and an outer shell that is formed integrally with the handle and attached to the back surface of the inner shell.

  In this case, the handle has left and right mounting portions integrated with the outer shell, a gripping member installed between rear ends of these mounting portions, and the left and right mounting portions for fastening the inner shell to the inner shell. It is preferable to include a cover portion for hiding the fastener.

  Further, the chair of the present invention comprises a backrest and a chair body having a back support structure that supports the backrest so that the backrest can be rocked. The backrest is an exterior material. And a back support structure for holding the exterior material, and a handle attachment portion for attaching a handle to the back support structure may be provided.

  Here, `` attachment '' is not limited to those attached via a fastening device such as a screw, for example, those that associate protrusions and recesses, those that are attached using an adhesive, etc. Various attachment modes are included.

  As described above, according to the present invention, it is possible to arrange the handle at a position where it is easy to hold the handle in a state where it is difficult to be restricted by design or structural design.

The whole perspective view from the back of the chair of a 1st embodiment of the present invention. The rear view which omitted the leg of the chair of the embodiment. The top view which abbreviate | omitted the leg of the chair of the embodiment. The right view which omitted the leg of the chair of the embodiment. AA line sectional view in FIG. The upper expanded sectional view in FIG. The lower expanded sectional view in FIG. The BB sectional drawing which abbreviate | omitted the chair main body and seat in FIG. The CC expanded top sectional view in FIG. The perspective view from the back which shows the principal part of the embodiment. The perspective view from the lower part which shows the principal part of the embodiment. Action | operation explanatory drawing shown in the center side cross section of the principal part of the embodiment. Action | operation explanatory drawing shown in the center side cross section of the principal part of the embodiment. Action | operation explanatory drawing shown in the side cross section of the principal part of the embodiment. Action | operation explanatory drawing shown in the side cross section of the principal part of the embodiment. Action | operation explanatory drawing shown in the side cross section of the principal part of the embodiment. The DD sectional view taken on the line in FIG. The whole perspective view from the back of the chair of a 2nd embodiment of the present invention. The rear view of the chair of the embodiment. The top view of the chair of the embodiment. The left view of the chair of the embodiment. The EE sectional view taken on the line in FIG. The upper part expanded sectional view in FIG. FIG. 20 is a cross-sectional view of the chair main body and the seat taken along line FF in FIG. The schematic of the handle which shows the modification of this invention. The schematic of the handle which shows the other modification of this invention.

<First Embodiment>
Hereinafter, an embodiment in which the present invention is applied to a synchro tilt type office rotary chair 1 will be described with reference to FIGS.

  The chair 1 is movable with respect to the floor. As shown in FIGS. 1 to 17, the chair body 2, the backrest 3 and the seat 4 supported by the chair body 2, and the back And a handle 5 supported by the drool 3.

<Chair body>
As shown in FIGS. 1, 2, 4, 5, 7, and 10 to 17, the chair body 2 is supported by a leg 21 and supported by the support base 22. A back support structure 23 that can be tilted backward, a seat support structure 24 disposed above the support base 22, the support base 22, the back support structure 23, and the seat support structure And a synchro-rocking mechanism 25 having 24 as a link element 254. The chair body 2 is configured such that the seat 4 supported by the seat support structure 24 tilts synchronously when the backrest 3 supported by the back support structure 23 tilts backward. It has been done. That is, an operation in which the seat 4 sinks at a constant angle ratio with respect to the backward tilting operation of the backrest 3, in other words, a synchro tilting operation is realized. In association with the synchro-rocking mechanism 25, a reaction force mechanism 26 for self-returning the backrest 3 to an initial position and a locking mechanism 27 for locking the backrest 3 at a predetermined tilting position are provided. ing.

<Legs>
As shown in FIGS. 1 and 10, the leg body 21 includes a leg blade type leg base 212 having casters 211, and a leg column 213 erected at the center of the leg base 212. The leg column 213 is a normal one mainly composed of a gas spring, and the support base 22 is attached to the upper end of the leg column 213.

<Support base>
As shown in FIGS. 2, 4, 5, 7, and 11 to 17, the support base 22 is supported by the leg body 21 so as to be able to turn horizontally, and is attached to the leg support 213. A main housing 221 and a sub housing 222 rigidly connected to the main housing 221 are provided. The main housing 221 is made of metal, and includes a bottom wall 223 having a boss portion 228 into which the upper end of the leg support 213 is fitted, and left and right side walls 224 erected from the left and right side edges of the bottom wall 223. It is provided and is open front and rear and upward. The sub-housing 222 is made of metal and has a bottom wall 225 whose base end portion is disposed in the main housing 221 and has a distal end extending forward, and left and right edges raised from the left and right edges of the bottom wall 225. Side walls 226 and ridges 227 extending outward from the upper edges of the both side walls 226. The sub-housing 222 abuts the lower surfaces of the two flanges 227 against the upper edges of the left and right side walls 224 of the main housing 221, and makes the left and right side walls 226 closely contact the inner surfaces of the left and right side walls 224 of the main housing 221. In this state, it is integrated with the main housing 221 by welding or the like.

  The support base portion 22 thus configured supports the back support structure 23 via the main shaft 28 so as to be able to tilt backward, and can rotate the front side of the seat support structure 24 via the front connection shaft 29. And it is supported so that it can slide back and forth. Specifically, the back support structure 23 is connected to both ends of the main shaft 28 that is rotatably passed between the side walls 224 of the main housing 221. Long holes 220 extending in the front-rear direction are provided in the side walls 226 of the sub-housing 222, and the front side of the seat support structure 24 is connected to both ends of the front connecting shaft 29 inserted through the long holes 220. doing. Since the reaction force mechanism 26 and the locking mechanism 27 are provided outside the support base 22, no space for providing these mechanisms is provided in the support base 22. That is, the support base portion 22 of this embodiment is much smaller than the support base portion provided with a reaction force mechanism and the like in the second embodiment to be described later.

<Back support structure>
As shown in FIGS. 5 to 7 and FIGS. 10 to 17, the back support structure 23 has a function as a so-called back support rod. For example, the back support structure 23 forms a pair arranged on both sides of the support base 22. A back frame 231 and a plurality of horizontal members 234, 235, 236 connecting the left and right back frames 231 are provided. The back frame 231 includes a lower frame element 232 that extends rearward with the base end portion 237 supported by the main shaft 28, and an upper frame element 233 that is bent upward from the rear end portion of the lower frame element 232 and extends. It has an L shape when viewed from the side. The lower frame element 232 and the upper frame element 233 are integrally formed by bending a pipe material. The lower frame element 232 is connected by a lower horizontal member 234, and the upper frame element 233 is connected by an intermediate horizontal member 235 and an upper horizontal member 236, respectively. The lower horizontal member 234 has a channel shape opened downward, and both side portions are coupled to the inner side of the lower frame element 234 via welding joints. The intermediate horizontal member 235 and the upper horizontal member 236 have a channel shape opened to the front, and are joined to the back side of the upper frame element 233 via welding joints. Plate-shaped mounting brackets 238 and 230 having bolt holes 238a and 230a are provided on the outer sides of the joint portions of the intermediate horizontal member 235 and the upper horizontal member 236.

<Seat support structure>
As shown in FIGS. 5, 7, and 11 to 16, the seat support structure 24 has a function as a so-called seat receiver and has a disk shape. The front end portion of the seat support structure 24 is provided with a pair of left and right front brackets 241 that hang downward. By attaching these front brackets 241 to both ends of the front connecting shaft 29, The seat support structure 24 is supported on the support base 22 so as to be rotatable and slidable. A rear bracket 242 is formed at the rear end of the seat support structure 24 so as to be paired left and right. The rear bracket 242 is connected to the back support structure 23 via the rear connecting shaft 20. The left and right back frames 231 are rotatably supported. On the lower surface of the seat support structure 24, an armrest attachment structure 243 is attached. Both ends of the armrest mounting structure 243 are extended outward from the left and right ends of the seat support structure 24 so that an armrest (not shown) can be detachably attached to the both ends. It is.

<Synchloro-packing mechanism>
As shown in FIGS. 5, 7, and 11 to 16, the synchro-rocking mechanism 25 includes the support base 22 and the back support that is supported by the support base 22 via a first shaft mounting portion 251. The structure 23 and the front side are supported by the support base 22 via the second pivoting portion 252 and the rear side is supported by the back support structure 23 via the third pivoting portion 253. The seat support structure 24 is provided. The first shaft attachment portion 251 is configured mainly with the main shaft 28, and is a portion on which the back support structure 23 is rotatably attached to the support base portion 22. The second shaft attachment portion 252 is configured mainly with the front connection shaft 29, and the seat support structure 24 is attached to the support base portion 22 so as to be able to rotate and slide back and forth. Part. The third shaft mounting portion 253 is configured mainly with the rear connecting shaft 20, and is a portion on which the seat support structure 24 is rotatably mounted with respect to the back support structure 23. It is. In other words, the synchro-rocking mechanism 25 includes three link elements 254 including the support base 22, the seat support structure 24, and the back support structure 23 in the first, second, and third shafts. It is configured by being axially attached via attachment portions 251, 252 and 253.

<Reaction mechanism>
As shown in FIGS. 1, 2, 4, 5, 7, and 10 to 16, the reaction force mechanism 26 self-returns the back support structure 23 to the initial position before the backward tilting operation. It is provided outside the support base 22. More specifically, the reaction force mechanism 26 is provided between the seat support structure 24 and a link element 254 other than the seat support structure 24 constituting the synchro-rocking mechanism 25. is there. In this embodiment, the reaction force mechanism 26 is provided between the seat support structure 24 and the back support structure 23, and supports the one end 264 on the seat support structure 24. A link element 254 other than the seat support structure 24, that is, a rod 261 that penetrates the back support structure 23 and extends the other end 265 to the outside, and a receiver provided on the other end 265 of the rod 261 A member 262 and an elastic body 263 provided between the receiving member 262 and the link element 254 other than the seat support structure 24, that is, the back support structure 23 are provided.

  As shown in FIGS. 5, 7, and 11 to 16, the rod 261 has an upper end that is the one end 264 side supported by the rear end of the seat support structure 24, and the other end 265 side. A male screw portion 266 is provided at a lower end portion. The rod 261 is inserted through a through-hole 239 provided in the lower horizontal member 234 of the back support structure 23, and the lower end protrudes below the lower horizontal member 234.

  As shown in FIGS. 1, 2, 4, 5, 7, and 10 to 16, the receiving member 262 can be screwed into and out of a male threaded portion 266 provided at the other end 265 of the rod 261. The cover member 262 is also provided with a cover 267 that also serves as a grip surrounding the elastic body 263. Specifically, the receiving member 262 includes a receiving tray 268 that receives the lower end portion of the elastic body 263, a nut 269 that is screwed to the male threaded portion 266 of the rod 261 so as to support the receiving tray 268 from the lower side, A stopper 260 provided at the lower end of the rod 261 to prevent the nut 269 from coming off from the male threaded portion 266, and a cover 267 that is fixed to the nut 269 and covers the outer periphery of the tray 268 and the elastic body 263. It becomes. The tray 268 is made of a sheet metal material, and the cover 267 is made of a synthetic resin.

  As shown in FIGS. 5, 7, and 11 to 16, the elastic body 263 is a plurality of compression coil springs 263 a and 263 b having different diameters and having an axial center aligned with the axial center of the rod 261. Specifically, the elastic body 263 is first wound between the receiving tray 268 of the receiving member 262 and the lower horizontal member 234 of the back support structure 23 while being wound around the rod 261. The compression coil spring 263a and the lower horizontal member of the back support structure 23 and the receiving plate 268 of the receiving member 262 are positioned in an annular space formed between the first compression coil spring 263a and the rod 261. 234 and a second compression coil spring 263b interposed therebetween. The first compression coil spring 263a and the second compression coil spring 263b are wound in different directions.

<Locking mechanism>
As shown in FIGS. 5, 7, and 11 to 17, the locking mechanism 27 is for locking the back support structure 23 at a predetermined tilt position, and is near the outside of the support base 22. And a connecting member 271 that rigidly couples the two back frames 231 and an engagement that is supported by the support base 22 so as to be pivotable in the front-rear direction via an operation shaft 272 and engageable with a predetermined portion of the connecting member 271. A member 273, and an operating means 274 for operating the engaging member 273 between an engaging position (B) for engaging the connecting member 271 and a retracted position (A) where the engaging member 271 cannot be engaged with the connecting member 271; A moderation mechanism 275 for selectively holding the engagement member 273 at either the engagement position (B) or the retracted position (A) is provided.

  As shown in FIGS. 7 and 11 to 16, the connecting member 271 has a metal plate shape. In this embodiment, the connecting member 271 has a rectangular shape having a substantially horizontal upper edge 61 and a lower edge 62. belongs to. The left and right ends of the connecting member 271 are rigidly connected to the inside of the back frame 231 via welding joints. An engagement hole 64 is formed in the intermediate portion 63 located between the upper edge 61 and the lower edge 62 of the connecting member 271.

  As shown in FIGS. 7 and 11 to 17, the engaging member 273 is a circuit that is disposed at the rear opening end of the main housing 221 of the support base 22 by fixing the base end 237 to the operation shaft 272. The moving plate 65 and a claw 66 projecting rearward from the rotating end of the rotating plate 65 are provided. The engaging member 273 is made of metal, and the rotating plate 65 and the claw 66 are integrally formed.

  As shown in FIGS. 1, 2, 4, 11, and 17, the operating means 274 is for applying an operating force in the rotational direction to the operating shaft 272, and bends one end of the operating shaft 272. And a gripping portion (not shown) for placing the hand on the bent portion 67.

  As shown in FIGS. 7 and 11 to 17, the moderation mechanism 275 is provided on the inner surface of the support base 22 and engages with the outer edge of the rotating plate 65, and elastically supports the moderation element 68. The elastic support element 69 is provided. Specifically, the elastic support element 69 includes a mounting base 691 attached to the inner surface of the side wall 224 of the main housing 221 of the support base 22 and an elastic wall 692 supported by the mounting base 691 and elastically deformed in the thickness direction. Therefore, the moderating element 68 having a hemispherical shape is provided on the side opposite to the mounting base 691 of the elastic wall 692. The mounting base 691, the elastic wall 692, and the moderation element 68 are integrally formed of synthetic resin. When the engaging member 273 is in the retracted position (A), the moderation element 68 is engaged with the back surface 651 side of the rotating plate 65. When the rotating plate 65 is rotated backward to move the engaging member 273 to the engaging position (B) from this state, the rotating plate 65 is biased and elastically supported by the elastic wall 692. The moderation element 68 is temporarily retracted to the side, and when the engagement member 273 reaches the engagement position (B), the moderation element 68 is elastically restored and engaged with the front surface 652 side of the rotating plate 65. It is supposed to be.

<Backrest>
As shown in FIGS. 1 to 10, the backrest 3 is supported by the back support structure 23 of the chair body 2, and includes an exterior material 32 and a back support structure that holds the exterior material 32. And a body 31.

  As shown in FIGS. 5 to 10, the back support structure 31 has a form called a so-called inner shell, and is integrally formed of synthetic resin such as nylon. The back support structure 31 includes a shell body 33 that defines the overall shape of the backrest 3, a rib 34 that reinforces the back surface of the shell body 33, and a back frame for mounting the back support structure 23. An attachment portion 35 and a handle attachment portion 36 for attaching the handle 5 are provided. The back frame mounting portion 35 is formed with boss portions having female screw holes (not shown) at portions corresponding to the bolt holes 238a and 230a provided in the mounting brackets 238 and 230 of the intermediate horizontal member 235 and the upper horizontal member 236, respectively. It is a thing. The handle attachment portion 36 is formed by forming a plurality of boss portions 361 having female screw holes 362 in a portion for attaching the handle 5 described later.

  As shown in FIGS. 1 to 10, the exterior material 32 covers a cushion 37 attached to the front surface of the back support structure 31 and the periphery of the cushion 37 and the back support structure 31. A tension fabric 38 and an outer shell 39 provided on the back surface of the back support structure 31 so as to hide the edge 381 of the tension fabric 38 are provided. The edge portion 381 of the upholstery 38 is turned to the back side of the back support structure 31 and is fixed to the back support structure 31 using a tacker (not shown) or the like. The outer shell 39 is made of synthetic resin, and includes an engaging claw 391 in the vicinity of the peripheral edge portion of the front surface portion. The outer shell 39 is attached to the back support structure 31 by elastically engaging the engaging claws 391 with the outer shell attachment portion 30 provided in the vicinity of the peripheral edge 381 of the back support structure 31. It has been. A cutout portion 392 for avoiding interference with the handle 5 is provided at the upper edge portion of the outer shell 39.

<Za>
As shown in FIGS. 1 to 5, 7, and 10, the seat 4 is supported by the seat support structure 24 of the chair body 2, and holds the exterior material 42 and the exterior material 42. And a structure 41 for a seat shape. The structure 41 for the seat shape is a so-called inner shell, and is integrally formed of a synthetic resin such as nylon. The exterior material 42 includes a cushion 43 attached to the upper surface of the seat retaining structure 41, and a tension fabric 44 that covers the cushion 43 and the periphery of the seat retaining structure 41.

<Hands>
As shown in FIGS. 1 to 6 and FIGS. 8 to 10, the handle 5 is provided on the back support structure 31, and includes left and right attachment portions 51 and rearward from both attachment portions 51. Arm portion 52 extended to each other, a gripping member 53 laid between the distal ends of these arm portions 52, and a blindfold member 54 laid between the base ends of the arm portions 52. It is integrally molded with resin. In other words, the handle 5 includes a gripping member 53 that can be gripped from the outside, an arm portion 52 that extends forward from the gripping member 53, and an attachment that extends downward from the base end portion of the arm portion 52. Part 51, and is attached to the back support structure 31 through a plurality of bolts 512, which are a plurality of fasteners arranged at intervals in the vertical direction. It is fixed to the back support structure 31 using bolts 512.

  As shown in FIGS. 9 and 10, each mounting portion 51 has a disk shape having bolt holes 511 that make a pair in the vertical direction. Then, bolts 512 that are fastening tools inserted through the bolt holes 511 of the attachment portions 51 are respectively screwed into the female screw holes 362 of the boss portions 361 constituting the handle attachment portions 36 of the back support structure 31. Thus, the handle 5 is attached to the back support structure 31 that is an inner shell. In other words, the chair 1 includes the outer shell 39 attached to the back surface of the inner shell in a state where the portion other than the attachment portion 51 of the handle 5 is exposed. That is, the back surface of the attachment portion 51 of the handle 5 is concealed by the outer shell 39 that is the exterior material 32.

  As shown in FIGS. 1 to 3, 8, and 10, each arm portion 52 is a plate-shaped member having a positioning projection 521 on the outer surface, and the positioning projection 521 is a notch portion of the outer shell 39. The handle 5 and the outer shell 39 can be positioned by engaging with a positioning recess 393 provided in the 392.

  As shown in FIGS. 1 to 6 and FIGS. 8 to 10, the gripping member 53 is a belt-plate-like member whose center portion curves in a direction protruding backward, and the curvature in plan view is the backrest 3 in plan view. It is larger than the curvature of the upper edge, and has a shape in which the vertical dimension is gradually increased from the center toward the outside in the rear view.

  As shown in FIGS. 1, 3, 5, 6, 8, and 9, the blindfold member 54 has a shape corresponding to the opening shape of the notch 392 of the outer shell 39. In a state where the 52 and the outer shell 39 are positioned, the back surface 541 of the blindfold member 54 and the back surface 394 of the outer shell 39 are set to be flush with each other.

  In this positioning state, the upper surface 522 of the arm portion 52 and the upward surface 395 of the outer shell 39 are flush with each other, and the back surface 531 of the gripping member 53 and the back surface 394 of the outer shell 39 are flush with each other. Is set to That is, the arm portion 52, the gripping member 53, and the blindfold member 54 each have an outer surface that is continuous with the outer surface of the outer shell 39.

  The handle 5 does not protrude upward from the upper edge of the backrest 3 of the chair body 2. In other words, the upper edge of the handle 5 is set below the upper edge of the backrest 3.

  The chair 1 can also be expressed as follows with respect to the handle 5. That is, this chair 1 is provided with a handle 5 on a backrest 3 provided with an exterior member 32 on the back, and the handle 5 has an upper surface extending rearward along a horizontal plane. A pair of left and right projections 55 projecting from the back surface of the backrest 3 and a gripping member 53 that is installed between the projections 55 and has an upper surface continuous with the upper surfaces of the projections 55. is there. The projecting portion 55 is formed by the arm portion 52 and a bulging portion 396 formed integrally with the outer shell 39 so as to be continuous with the arm portion 52, and the projecting dimension toward the rear is directed outward. The shape is gradually reduced. A cavity 7 is formed between the gripping member 53 and the backrest 3 so as to communicate with the top and bottom, and the back surface of the backrest 3 below the gripping member 53 is covered with an outer shell 39.

<Operation description>
Next, the operation of the chair 1 will be described with reference to FIGS.

  When a rearward load is applied to the backrest 3 from the initial state shown in FIGS. 12, 14, and 17, the first support portion 251 configured by the main shaft 28 of the support base 22 is formed on the back support structure 23. Tilt back around. When the back support structure 23 is tilted backward, the rear end side of the seat support structure 24 pivotally attached to the lower frame element 232 of the back support structure 23 via the third shaft mounting portion 253 is It moves downward while moving backward. At that time, the front end side of the seat support structure 24 supported by the support base portion 22 via the second shaft mounting portion 252 rotates slightly while moving backward. As a result, as shown in FIG. 13 and FIG. 16, the backrest 3 is synchronized to rotate backward so that the seat 4 sinks backward while tilting backward. At that time, the distance between the rear end portion of the seat support structure 24 and the lower frame element 232 of the back support structure 23 is increased, and the elastic body 263 of the reaction force mechanism 26 is compressed to accumulate the repulsive force. It will be. That is, when the distance between the rear end portion of the seat support structure 24 and the lower frame element 232 of the back support structure 23 is increased, the seat support structure 24 is supported via the rod 261. The distance between the receiving member 262 and the lower horizontal member 234 provided on the lower frame element 232 of the back support structure 23 is reduced, and the elastic body 263 is compressed.

  When the rearward load acting on the backrest 3 is released or reduced, the repulsive force of the elastic body 263 performs an operation opposite to the above-described operation, and the backrest 3 rotates and returns to the front. At the same time, the seat 4 returns to the initial position. The repulsive force can be adjusted by changing the preload of the elastic body 263 by operating the cover 267 also serving as a grip and adjusting the position of the receiving member 262.

  If the engaging member 273 of the locking mechanism 27 is held at the retracted position (A) by the moderation mechanism 275, the above-described synchronization operation can be performed freely.

  If it is desired to stop the synchro operation halfway, the operation member 274 may be operated at the desired tilt position to rotate the engagement member 273 to the engagement position (B). That is, as shown in FIG. 17, when the operating member 274 is operated from the retracted position (A) to the engaged position (B) by operating the operating means 274 at the initial position, the engaging member 273 is used for back support. It will be engaged with the lower edge 62 of the connecting member 271 provided at the base end of the structure 23, and the backrest 3 is locked in the initial position as shown in FIGS. Thereby, the seated person can take a working posture. Further, when the operating member 274 is operated from the retracted position (A) to the engaged position (B) by operating the operating means 274 at an intermediate tilt position between an initial position and a final tilt position described later, the engagement member 273 engages with the engagement hole 64 of the connecting member 271 provided at the base end of the back support structure 23, and as shown in FIG. 15, the backrest 3 is locked at the intermediate rearward tilt position. Thereby, the seated person can take an intermediate posture. Furthermore, when the operating member 274 is operated from the retracted position (A) to the engaged position (B) by operating the operating means 274 at the last tilted position, the engaging member 273 becomes the base end of the back support structure 23. 13 and FIG. 16, the backrest 3 is locked at the last tilted position. Thereby, the seated person can take an easy posture.

<Effect of this embodiment>
Since the chair 1 includes the handle 5 on the back surface of the backrest 3, the chair 1 can be moved freely by placing a hand on the handle 5. Therefore, it can suppress that the backrest 3 gets dirty or damaged compared with the case where the chair 1 is moved by putting a hand on the upper edge of the backrest 3. That is, in the chair 1 in which the back support structure 23 as shown in the present embodiment is hidden inside by the exterior material 32 such as the cushion 37 and the outer shell 39, the back support structure 23 is grasped from the outside. Since 1 cannot be moved, it is possible to suitably solve the problem that the exterior material 32 has been conventionally required to be in contact with the exterior material 32.

  And since the cavity 7 is provided between the holding member 53 of the handle 5 and the back surface of the backrest 3, the hand can be applied from the top or the bottom, and the usability is not only good. It is also possible to hang a belonging such as a stall on the member 53.

  Moreover, since the upper edge of the handle 5 is set below the upper edge of the backrest 3, the handle 5 can be easily held and strong. For example, when the handle 5 is compared with a hanger that can be attached to the backrest, the hanger can be placed on the floor even when the clothes are tilted backwards while hanging relatively long clothes such as a half coat. It must be installed in a relatively high position so that it does not stick. Therefore, in the conventional hanger, the base end portion of a relatively long arm is attached to the backrest, and the hanger body is positioned at the distal end portion of the arm at a position away from the top after the backrest. Therefore, it is usual to provide only the minimum strength capable of holding clothing. On the other hand, it is necessary for the handle 5 to have both the arrangement at a position where it is easy to hold and the strength with which the handle 1 can be moved by holding the handle 5. That is, the handle 5 of this embodiment is set above the back of the backrest 3 to ensure ease of holding, and the arm portion 52 is set shorter than the arm of the hanger to ensure strength. Yes. If the arm portion 52 of the handle 5 is relatively short, it is positioned near the backrest 3. If the upper edge of the handle 5 is set higher than the upper edge of the backrest 3, the backrest There is a possibility that the handle 5 hits the seated person's shoulder or head when the head 3 is tilted backward. Therefore, the handle 5 of the present embodiment is positioned at a position lower than the upper limit of the height of the backrest 3. In other words, the upper edge of the handle 5 is set below the upper edge of the backrest 3.

  As described above, the chair 1 according to the present embodiment includes the backrest 3 and the chair main body 2 having the back support structure 23 that supports the backrest 3 so that the backrest 3 can be locked. The backrest 3 includes an exterior material 32 and a back support structure 31 for holding the exterior material 32, and the back support structure 31 has a handle 5. Since the handle attachment portion 36 for attaching the handle 5 is provided, and the handle 5 is provided directly on the handle attachment portion 36, the handle 5 can be attached without difficulty to the upper position of the backrest 3 that the user can easily grasp. it can. In the present embodiment, the exterior material 32 and the handle 5 are independent of each other, and the exterior material 32 and the handle 5 are both attached to the back support structure 31. The handle 5 can be attached to the handle attachment portion 36 even in a state in which 32 is not attached. It is also possible to attach an exterior material of the type that does not have the handle 5 to the back support structure 31.

  The grip 5 includes a grip member 53 that can be gripped from the outside, an arm portion 52 that extends forward from the grip member 53, and an attachment portion 51 that extends downward from the base end portion of the arm portion 52. Provided, and attached to the back support structure 31 via two bolts 512 arranged at intervals in the vertical direction, and the mounting portion 51 uses the upper and lower bolts 512. Thus, the handle 5 that is loaded in the vertical direction can be firmly fixed. In addition, when attaching the handle 5 to the upper part of the backrest 3, it is necessary to have a safety that can maintain the state of being integrally attached to the chair body 2 as a structure. A plurality of metal parts such as bolts 512 are used so that it can be confirmed that they are securely fixed to 31.

  Since the backrest 3 includes the cushion 37 and the inner shell that is the back support structure 31 that holds the cushion 37 from the back side, the shell 3 while maintaining the shape of the backrest 3 appropriately. The attachment portion 51 of the handle 5 can be attached to a predetermined portion of the back-supporting structure 31 in the shape of a ring.

  The handle 5 has left and right attachment portions 51 attached to an inner shell that is a back support structure 31 via bolts 512 that are fastening devices, and the backrest 3 An inner shell that holds the cushion 37 from the back side and an outer shell 39 that is mounted on the back surface of the inner shell in a state in which a portion other than the attachment portion 51 of the handle 5 is exposed. Therefore, the appearance of the chair 1 can be improved not only in the specification with the handle 5 attached but also in the specification for use without the handle 5 attached. That is, since the outer shell 39 and the handle 5 are independent of each other without being directly attached via the fastening device, the degree of freedom in designing the outer shell 39 and the handle 5 that affects the appearance of the chair 1 is increased. be able to. Further, since the handle 5 is provided on the back side of the backrest 3 covered with the outer shell 39, when the user accesses the handle 5 from the side surface or the back side of the chair 1, the handle 5 It is possible to prevent the backrest 3 other than from being soiled or damaged. Further, since the back surface of the attachment portion 51 of the handle 5 is concealed by the outer shell 39 which is the exterior material 32, the appearance of the chair 1 can be improved.

  The handle 5 includes left and right attachment portions 51, an arm portion 52 extending rearward from both attachment portions 51, a gripping member 53 laid between the tips of the arm portions 52, and the arm portion 52. The arm portion 52, the gripping member 53, and the blindfold member 54 each have an outer surface that is continuous with the outer surface of the outer shell 39. As a result, the handle 5 can be smoothly connected to the chair body 2. Therefore, when the chair 1 is moved, it can suppress suitably that the handle 5 is caught in the furniture of the peripheral part of the chair 1, etc.

  Further, since the attachment portion 51 of the handle 5 is provided at a different height from the gripping member 53, the back support structure 31 attached to the handle attachment portion 36 of the back support structure 31. Therefore, it is possible to suppress the problem of interference between the covered tension 38 and the attachment portion 51 of the handle 5. In other words, since the handle 5 is fixed by the bolt 512 at an eccentric position different from the appearance, the handle 5 is provided at the upper end of the backrest 3, but the backrest 3 The upholstery 38 can be appropriately arranged at the upper end. That is, although the handle 5 appears to be attached to the upper portion of the backrest 3 in appearance, the space necessary for fixing the exterior member 32 that wraps the cushion 37 to the back support structure 31 in terms of structure. It is arranged so that it does not interfere with. The handle 5 has a structure in which a large external force acts particularly from the vertical direction. In order to securely fix the handle 5 to the back support structure 31, Each of the upper and lower bolts 512 is fastened.

  Since the chair 1 of this embodiment is provided with the locking mechanism 27 outside the support base 22, the support base 22 can be made more compact than before. Therefore, the vertical dimension of the entire support base 22 can be reduced, and the position where the seating surface is lowest can be made lower than before, and it is easy for a seated person with a relatively small body shape to sit. In addition, since the locking mechanism 27 has a simple structure as compared with the conventional one, not only the assembly work is easy, but also the occurrence of failure can be suppressed.

Second Embodiment
Next, another embodiment in which the present invention is applied to the synchro tilt type office rotary chair 1 will be described with reference to FIGS.

  The chair 1 is movable with respect to the floor surface. As shown in FIGS. 18 to 24, the chair body 2, the backrest 3 and the seat 4 supported by the chair body 2, and the back. And a handle 5 supported by the drool 3.

<Chair body>
As shown in FIGS. 18 to 22, the chair body 2 includes a support base 22 supported by the legs 21, a back support structure 23 that is supported by the support base 22 and can be tilted backward, and the support. A seat support structure 24 disposed above the base portion 22; and a locking mechanism 9 including the support base portion 22, the seat support structure 24, the front link member 294, and the rear link member 295 as link elements 254. It has. The chair body 2 is configured such that the seat 4 supported by the seat support structure 24 tilts synchronously when the backrest 3 supported by the back support structure 23 tilts backward. It has been done. Hereinafter, the same reference numerals as those of the first embodiment are given to the same or similar parts as those of the chair 1 of the first embodiment, and detailed description thereof will be omitted.

<Support base>
As shown in FIGS. 18, 19, 21, and 22, the support base portion 22 is supported by the leg body 21 so as to be able to turn horizontally, and a metal housing 291 attached to the leg support 213, and the housing A front link shaft 292 and a support shaft 293 attached to 291 are provided. The front link shaft 292 is for supporting the front end portion of the seat support structure 24 via the front link member 294. The support shaft 293 supports the back support structure 23 and supports a substantially intermediate portion of the seat support structure 24 via the rear link member 295. The housing 291 incorporates a tilt reaction force generation mechanism 296 that biases the backrest 3 forward. The tilt reaction force generation mechanism 296 is configured to apply a force to the support shaft 293 by using a coil spring, a gas spring, or the like, and to apply an elastic repulsion force to the tilt operation of the backrest 3. However, since it is a normal thing, description is abbreviate | omitted. The seat support structure 24 is supported on the support base 22 thus configured via the front link member 294 and the rear link member 295. FIG. 22 shows only the cover that covers the support base 22 in a cut state, and the support base 22 is not cut.

<Seat support structure>
As shown in FIG. 22, the seat support structure 24 has a function as a so-called seat receiver. In this embodiment, the seat support structure 24 is integrally formed of a sheet metal material. On the lower surface of the seat support structure 24, the front link attachment portion 245 for attaching the rotation end of the front link member 294 via the front connection shaft 244 and the rotation of the rear link member 295 via the rear connection shaft 246 are provided. A rear link attaching portion 247 for attaching the moving end is provided. The front link attaching portion 245 and the rear link attaching portion 247 are provided integrally with the seat support structure 24. An armrest mounting portion 248 for mounting the base end portion 237 of the armrest 8 is provided on the lower surface of the seat support structure 24.

<Back support structure>
As shown in FIGS. 19, 21, and 22, the back support structure 23 includes left and right back frames 255 made of synthetic resin extending rearward and upward from the support base 22, and the left and right back frames 255. An upper horizontal member (not shown) that connects the upper ends of the two frames and a left and right spine that are integrally extended from the base end of the torque transmission bracket 297 toward the rear upper side and are attached to the inner side surface of the base end portion of the back frame 255. A support bracket 256 and a lower horizontal member (not shown) for connecting the rear ends of the left and right back support brackets 256 are provided. The back support bracket 256 and the lower horizontal member are made of metal each having a plate shape, and are rigidly connected to the inner side surfaces of the left and right back support brackets 256 at both left and right ends of the lower horizontal member. Note that FIG. 22 shows only the cover that covers the support base 22 in a cut state, and shows the state in which the back support bracket 256 and the torque transmission bracket 297 are not cut.

<Locking mechanism>
As shown in FIGS. 19, 21, and 22, the locking mechanism 9 is of a weight sensing type in which the seat 4 is moved upward while being tilted in accordance with the backward tilting operation of the backrest 3. More specifically, the locking mechanism 9 includes a support base 22 that holds the front link shaft 292 on the front side and a support shaft 293 on the rear side, and a lower end portion of the support base 22 via the front link shaft 292. A front link member 294 that is pivotally supported on the rear, a rear link member 295 in which a lower end portion is integrated with a shaft mounting portion of the back frame 255 supported by the support shaft 293, and a front link mounting portion 245. A seat support structure in which the front link member 294 is connected to the rotating end of the front link member 294 via the front connecting shaft 244 and the rear link mounting portion 247 is connected to the rotating end of the rear link member 295 via the rear connecting shaft 246. The body 24 is the main component. In other words, the locking mechanism 9 is configured such that the seat support structure 24 that supports the seat 4 is supported by the support base 22 by the front link member 294 and the rear link member 295 that are inclined in the same direction, and is supported by the support base 22. In accordance with the backward tilting operation of the back frame 255, the front link member 294 and the rear link member 295 are rotated in the upright direction to lift the seat support structure 24 upward. And when the backrest 3 is tilted backward, the front part of the seat 4 is lifted more than the rear part of the seat 4. That is, in the synchro-rocking mechanism 25 of the backrest 3 and the seat 4 as shown in the first embodiment, the seat 4 is tilted only downward in accordance with the backward tilting operation of the backrest 3. Unlike the normal locking mechanism, the weight sensing type locking mechanism 9 as shown in the form tilts the seat 4 in accordance with the backward tilting motion of the backrest 3 and resists the seat 4 against the load of the seated person. It is configured to lift.

<Backrest>
As shown in FIGS. 18 to 24, the backrest 3 is supported by the back support structure 23 of the chair body 2, and includes an exterior material 32 and a back support structure that holds the exterior material 32. And a body 31. The back support structure 31 is a so-called inner shell, is integrally formed of a synthetic resin such as nylon, and has a structure according to the backrest 3 of the first embodiment. . The outer shell 39 is made of synthetic resin, and in the present embodiment, is molded integrally with the handle 5. The outer shell 39 is attached to the back surface of the inner shell, and is attached to an outer shell mounting portion (not shown) provided on the back side of the back support structure 31.

<Za>
As shown in FIGS. 18 to 22, the seat 4 is supported by the seat support structure 24 of the chair body 2, and includes an exterior material 42 and a seat-retaining structure that holds the exterior material 42. 41. The structure 41 for a seat-holding shape is a so-called inner shell, is integrally formed of synthetic resin such as nylon, and has a structure according to the seat 4 of the first embodiment.

<Hands>
As shown in FIGS. 18 to 24, the handle 5 is provided on the back support structure 31, and includes left and right attachment portions 51 integrated with the outer shell 39, and the attachment portions 51. A gripping member 53 provided between rear ends and a cover portion 56 for concealing a fastening tool for fastening the left and right attachment portions 51 to the inner shell are provided. In other words, in the handle 5, the left and right attachment parts 51 and the gripping member 53 are integrally formed with the outer shell 39 from synthetic resin, and the synthetic resin cover part 56 is formed on the outer surface side of the attachment part 51. Is attached.

  As shown in FIGS. 18 to 24, each mounting portion 51 has a disk shape having a bolt hole 511. Then, bolts 512 that are fastening tools inserted through the bolt holes 511 of the attachment portions 51 are respectively screwed into the female screw holes 362 of the boss portions 361 constituting the handle attachment portions 36 of the back support structure 31. Thus, the handle 5 is attached to the back support structure 31 that is an inner shell. A notch 513 is provided on the back side of each mounting portion 51.

  As shown in FIGS. 18 to 24, the gripping member 53 is a strip-shaped member that curves in the direction in which the central portion protrudes backward, and the curvature in plan view is greater than the curvature of the upper edge of the backrest 3 in plan view. In addition to increasing the size, the vertical dimension in the rear view is gradually increased from the center toward the outside. A notch 532 is provided on the back surface 531 side of the grip member 53.

  As shown in FIGS. 18 to 24, the cover portion 56 has a shape corresponding to the opening shape of the notches 513 and 532 of the attachment portion 51 and the gripping member 53, and the cover portion 56 is attached to the attachment portion 51 and the cover portion 56. When attached to the gripping member 53, the back surface 561 of the cover portion 56 and the back surface 394 of the outer shell 39 are set to be flush with each other. In this positioning state, the upper surface 562 of the cover portion 56 and the upward surface 395 of the outer shell 39 are set to be flush with each other. That is, the cover portion 56 includes an outer surface that is continuous with the outer surface of the outer shell 39. That is, the back surface of the attachment portion 51 of the handle 5 is concealed by an exterior material, specifically, a cover portion 56 that is a partial cover member.

  The chair 1 can also be expressed as follows with respect to the handle 5. That is, this chair 1 is provided with a handle 5 on a backrest 3 provided with an exterior member 32 on the back, and the handle 5 has an upper surface extending rearward along a horizontal plane. A pair of left and right projections 55 projecting from the back surface of the backrest 3 and a gripping member 53 that is installed between the projections 55 and has an upper surface continuous with the upper surfaces of the projections 55. is there. The projecting portion 55 is formed by the mounting portion 51 and a bulging portion 396 formed integrally with the outer shell 39 so as to be continuous with the mounting portion 51, and the rearward projecting dimension is directed outward. The shape is gradually reduced. A cavity 7 is formed between the gripping member 53 and the backrest 3 so as to communicate with the top and bottom, and the back surface of the backrest 3 below the gripping member 53 is covered with an outer shell 39.

<Effect of this embodiment>
As described above, since the chair 1 according to the present embodiment has the above-described configuration, it is possible to obtain an effect similar to or similar to that described in the first embodiment.

  Moreover, in the chair 1 of this embodiment, the handle 5 attaches the right and left attachment parts 51 to the inner shell which is the structure 31 for back support shape via a fastening tool, and the backrest 3 includes a cushion 37, an inner shell that holds the cushion 37 from the back side, and an outer shell 39 that is molded integrally with the handle 5 and attached to the back surface of the inner shell. The attaching operation of the outer shell 39 to the inner shell and the attaching operation of the handle 5 to the inner shell can be performed at a time.

  The handle 5 has left and right attachment portions 51 integrated with the outer shell 39, a gripping member 53 installed between rear ends of these attachment portions 51, and the left and right attachment portions 51 fixed to the inner shell. Since the cover part 56 for concealing the fastening tool for doing is provided, the handle 5 can be smoothly continued with respect to the chair main body 2. FIG. Therefore, when the chair 1 is moved, it can suppress suitably that the handle 5 is caught in the furniture of the peripheral part of the chair 1, etc.

  The present invention is not limited to the embodiment described above.

  The handle of the present invention may be anything as long as it is provided in the back support structure, and even if the handle is integrally provided in the back support structure. Good. Moreover, the aspect of the backrest is not limited to the above-described one. For example, the handle may be attached to the backrest that does not include the outer shell.

  The shape and size of the handle are not limited to those described above, and can be variously changed. For example, the attachment portion is not limited to the left and right two places, and may be one place or three places or more, and the attachment method is not limited to that described above.

  For example, the handle includes a gripping member that can be gripped from the outside, an arm portion that extends forward from the gripping member, and an attachment portion that extends downward from the base end portion of the arm portion, and is provided in the vertical direction. It is attached to the structure for back support shape via a plurality of fastening devices arranged at intervals, and the attachment portion is used for the back support shape using at least one of the fastening devices. It may be fixed to the structure. Specifically, the handle is a back-supporting structure using a fastener at the base end of the handle main body (more specifically, the arm portion) positioned above and below, and at the attachment portion, one each. What is attached to can be considered.

  A modification of the handle is shown in FIG. In FIG. 25, the handle A5 is directly attached to the handle attachment portion A36 provided in the back support structure A31. Specifically, the handle A5 includes a gripping member A53 that can be gripped from the outside, an arm part A52 that extends forward and downward from the gripping member A53, and a downward extension from the base end of the arm part A52. It attaches to the said structure A31 for back support shape via the engaging part A57 and the bolt A512 which are fasteners arranged at intervals in the up-down direction. The left and right attachment portions A51 of the handle A5 are respectively positioned on the lower side of the protrusion A572 that can be engaged with the recess A571 provided in the back support structure A31 and the protrusion A572. It is fixed to the back support structure A31 by using one fastening tool A512 through which a bolt hole A511 provided in the attachment portion A51 is inserted. The handle A5 does not protrude upward from the upper edge of the backrest of the chair body. Specifically, the upper edge of the gripping member A53 of the handle A5 is above the back support structure A31. It does not protrude above the edge. In other words, the upper edge of the handle A5 is set below the upper edge of the backrest. Note that the number and shape of the protrusions A572 and the recesses A571 are not limited to those illustrated, and can be variously changed.

  In the case of the handle A5 as in the modification shown in FIG. 25, since the arm portion A52 extends not only in the front-rear direction but also in the vertical direction, the attachment portion A51 is separated from the upper edge of the back support structure A31. The gripping member A53 can be disposed at an appropriate height. Therefore, the handle A5 can be easily held and strong.

  Further, another modification of the handle is shown in FIG. In the structure shown in FIG. 26, a handle B5 having a T-shape in a back view is directly attached to a handle attachment portion B36 provided in the back support structure B31. Specifically, the handle B5 includes a gripping member B53 that can be gripped from the outside, an arm portion B52 that extends forward and downward from the gripping member B53, and a base end portion of the arm portion B52 that extends downward. And the mounting portion B51 is attached to the back support structure B31 via a plurality of bolts B512 that are spaced apart in the vertical direction. The upper and lower bolts B512 are used to fix the back support structure B31. The handle B5 does not protrude above the upper back edge of the chair body. Specifically, the upper edge of the gripping member B53 of the handle B5 is above the back support structure B31. It does not protrude above the edge. In other words, the upper edge of the handle B5 is set below the upper edge of the backrest. The handle may be L-shaped when viewed from the back with a gripping member extending in only one direction from the tip of the arm portion.

  In the case of the handle B5 as in the modification shown in FIG. 26, the arm portion B52 extends not only in the front-rear direction but also in the up-down direction as in the case of the handle A5 described above. It can be attached to a location away from the upper edge of the structural body B31, and the gripping member B53 can be arranged at an appropriate height. Therefore, the handle B5 can be easily held and strong.

  The mounting portion is not limited to the one that extends downward from the base end portion of the arm portion, but one that extends upward or the left and right lateral direction (one direction of outward or inward, or both outward and inward directions). ) May be extended. Further, the attachment portion may be fixed to the back support structure by a plurality of bolts arranged in the left-right direction.

  You may use the handle attachment part provided in the structure for back support shapes in order to attach components other than a handle. For example, using the female screw hole of this boss part, the base end part of the headrest, the base end part of the hanger, the core material for the high back specification, in other words, the core material for extending the vertical direction of the backrest It is conceivable to attach optional members such as.

  Also, other parts may be attached to the handle. That is, since a cavity is formed between the handle and the backrest, for example, it is conceivable to attach an optional member such as a base end portion of a hanger to the grip member of the handle.

  The locking mechanism only needs to be open at least behind the support base, and the forms of the connecting member and the engaging member are not limited to those described above. In the above-described embodiment, the engagement hole is provided at a predetermined height position of the intermediate part of the connecting member. However, the engagement hole is not provided, or a plurality of pairs of engagements are provided at intervals in the vertical direction. It may be provided with a hole. That is, the backrest may be fixed at two backward tilt positions, or may be fixed at four or more rearward tilt positions. Further, such engagement holes are not limited to those divided in the left-right direction. In addition, if a guide surface for smoothly guiding engagement / disengagement is provided on at least one of the connection member and the engagement member at a position where the connection member and the engagement member are locked, The rattling can be suppressed, and the seated person can smoothly operate the operation member.

  In addition, various changes may be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Chair 2 ... Chair main body 23 ... Back support structure 3 ... Backrest 31, A31, B31 ... Back support structure (inner shell)
32 ... exterior material 37 ... cushion 39 ... outer shell 5, A5, B5 ... handle 51, A51, B51 ... mounting portion 52, A52, B52 ... arm portion 53, A53, B53 ... gripping member 54 ... blindfold member 56 ... cover Part

Claims (8)

A chair comprising a backrest and a chair body having a back support structure that supports the backrest so that the backrest can be rocked.
The backrest is provided with an exterior material and a back support structure for holding the exterior material, and a handle is directly provided on the back support structure. The handle includes a gripping member that can be gripped from the outside, an arm portion that extends forward from the gripping member, and an attachment portion that extends downward from the base end portion of the arm portion, and is spaced vertically. It is attached to the structure for back support shape through a plurality of fastening devices arranged with an opening, and the attachment portion is used for the back support shape using at least one of the fastening devices. The chair according to claim 1, which is fixed to the structure. The handle is constructed between left and right attachment parts, an arm part extending rearward from both attachment parts, a gripping member constructed between the distal ends of the arm parts, and a base end of the arm part. The arm portion, the gripping member, and the blindfold member are respectively continuous with the outer surface of the outer shell that is attached to the back surface of the inner shell that is the back support structure. The chair according to claim 1 or 2, further comprising an outer surface. The chair according to claim 1, 2, or 3, wherein the backrest includes a cushion and an inner shell that is the back-holding structure for holding the cushion from the back side. The backrest is provided with a cushion and an inner shell that holds the cushion from the back side, and the attachment portion rear surface of the handle is formed from at least one of a stretched ground, an outer shell, and a partial cover member. The chair according to claim 3 or 4, wherein said chair is concealed by an exterior material. The handle is attached to the inner shell, which is the structure for back support, with the attachment portions on the left and right sides via fastening devices,
The backrest includes a cushion, an inner shell that holds the cushion from the back side, and an outer shell that is formed integrally with the handle and attached to the back surface of the inner shell. The chair according to 3, 4, or 5. The handle has left and right mounting portions integrated with the outer shell, a gripping member installed between rear ends of the mounting portions, and a fastening for fastening the left and right mounting portions to the inner shell. The chair according to claim 6, further comprising a cover portion for concealing the implement. A chair comprising a backrest and a chair body having a back support structure that supports the backrest so that the backrest can be rocked.
The backrest is provided with an exterior material and a back support structure for holding the exterior material, and a handle attachment portion for attaching a handle to the back support structure is provided. A chair characterized by that.

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