JP5561757B2 - Chair - Google Patents

Description

  The present invention relates to a chair provided with a headrest.

  Conventionally, various chairs provided with a headrest have been proposed. These are generally firmly attached to a back frame and a back outer shell that constitute the outer shape of the back. These chairs equipped with headrests are designed so that they can be attached to and detached from the back frame and back outer shell. A chair that can support the head according to the posture of the individual occupant has been proposed by providing a function capable of adjusting the relative angle to the shell.

  In addition, the chair described in the same document is a material that seems to be softer than the back outer shell on the inside of the back outer shell constituting the outer shape of the back as a structure for facilitating the change of the posture of the upper body of the seated person. By providing a back inner shell constituted by the above-described configuration and allowing the back inner shell to follow a change in the shape and posture of the seated person, the upper body of the seated person is supported by the back inner shell from the waist to the back. At the same time, the head of the seated person is supported by a headrest attached to the back outer shell (see, for example, Patent Document 1).

JP 2003-265264 A

  However, as described above, since the conventional headrest is attached to the back frame and the back outer shell that constitute the outer shape of the back as described above, for example, the back inner shell as in the chair of Patent Document 2 is used. Preferably, the headrest position is determined by the back outer shell because the position of the headrest is determined by the movement of the back inner shell, that is, the movement of the upper body. It is the present condition that it cannot follow the part.

  In order to make the headrest correspond to the movement of the head accompanying the movement or deformation of the back inner shell, the mounting structure of the headrest to the back frame or the back outer shell must be made more complicated. However, even if such a mode is adopted, the headrest is operated through the movement of the seated person's head, and thus the seated person's head is given more or less a sense of incongruity due to friction and pressure caused by the movement. This is the current situation.

  The present invention focuses on such problems, and an object of the present invention is to provide a chair that can easily and reliably correspond to the movement of the upper body of a seated person.

  In order to achieve such an object, the present invention takes the following measures.

  The chair according to the present invention is a chair comprising a back outer shell and a back inner shell attached to the inner surface of the back outer shell, the head inner mounting portion being provided on the back inner shell, The headrest attached to the headrest attachment portion is configured to be directly supported by the back inner shell.

  In such a case, since the headrest is directly supported by the back inner shell, the movement of the back inner shell can be performed without passing through the head of the seated person with respect to the detailed movement of the upper body of the seated person. Therefore, it is possible to make the movement of the headrest more precise and prompt. By doing so, it is possible to provide a chair provided with a headrest that can favorably support the head without impairing the sitting comfort of a seated person with the back in the back inner shell.

In order to realize the mounting of the headrest that can effectively avoid impairing the operation of the back inner shell, the headrest is attached to the headrest main body for supporting the head of the seated person and the back inner shell mounting portion. The base and the headrest body and the base are integrally formed with a bent portion that is bent in a side view.

  If the bent portion has a cushion pull-in portion on the front side that is recessed in side view at the bent portion, a cushion similar to the back inner shell can be applied to the headrest with a simple structure.

  In particular, as a specific configuration capable of suitably attaching a tension fabric or a cushion, the drawing portion has a wire groove for positioning a wire for pressing the cushion, and a string insertion hole for inserting a string for pulling the wire. Can be mentioned.

  In order to enable quick and reliable mounting and positioning of the headrest with respect to the back inner shell, a side view for placing the bent portion on the upper edge of the back inner shell on the back side of the bent portion. It is preferable to have a projecting step portion that protrudes and to form the back inner shell and the headrest on the back surface in a continuous manner.

Further, the present invention as a structure for mounting the headrest without compromising the seating feeling for the back inner shell is characterized in that the base is that a plate shape capable of close contact with the back inner shell mounting portion.

  When the headrest body and the base are integrally formed, in order to effectively secure the strength of the headrest body and the base, the headrest body is curved in side view and the base is curved in plan view. It is desirable to have a different shape.

  In order to enable quick assembly of the chair when the headrest is applied, a cushion is attached to the back inner shell while the headrest is supported, and then the back inner shell and the headrest And it is preferable to apply the aspect which comprises the back unit which can be attached to the said back outer shell by covering a cushion with a tension fabric.

  In order to allow the back unit to move according to the upper body of the seated person, the upper end of the back unit is allowed to move in the surface direction of the back outer shell with respect to the back outer shell. It is desirable to install it.

  According to the present invention, since the headrest is directly supported by the back inner shell, the headrest can move to the movement of the back inner shell without passing through the head of the seated person with respect to the detailed movement of the upper body of the seated person. Therefore, it is possible to provide a chair provided with a headrest that can favorably support the head without impairing the sitting comfort of the seated person.

1 is an overall perspective view showing an embodiment of the present invention. The disassembled perspective view which shows the front side of the backrest of the embodiment. The disassembled perspective view which shows the front side of the backrest of the embodiment. The disassembled perspective view which shows the back side of the back unit of the embodiment. The disassembled perspective view which shows a part of backrest of the embodiment. The partial expansion perspective view which shows a part of back unit in the embodiment. The principal part expansion perspective view of the back unit in the embodiment. The principal part enlarged front view of the back unit in the embodiment. XX sectional drawing in FIG. The YY sectional view taken on the line in FIG. The center side end surface and flat end surface figure of the headrest in FIG.

  Hereinafter, an embodiment in which the present invention is applied to a synchro tilt type office rotary chair will be described with reference to the drawings.

  As shown in FIG. 1, the chair includes a leg 1, a support base 2 that is supported by the upper part of the leg 1 and can be turned horizontally, a seat 3 that is disposed on the support base 2, A seat 4 held by the seat receiver 3, an armrest 9 extending from the lower side of the seat receiver 3 to the left and right, a back support bar 5 provided on the support base 2 so as to be able to tilt backward, and the back And a backrest 6 attached to the support 5.

  As shown in FIG. 1, the leg portion 1 includes a leg blade type leg base 11 having casters and a leg column 12 erected at the center of the leg base 11. The leg strut 12 is a normal one mainly composed of a gas spring, and the support base 2 is attached to the upper end of the leg strut 12.

  As shown in FIG. 1, the support base portion 2 is supported by the leg portion 1 so as to be able to turn horizontally, and includes a housing 21 attached to the leg column 12 and a backrest support penetrating the housing 21. And a tilting reaction force generating mechanism (not shown) that applies a force to the main shaft 22 to generate an elastic repulsive force with respect to the backward tilting operation of the backrest 6. The tilt reaction force generation mechanism is configured to be able to apply an elastic repulsion force in the rotational direction to the main shaft 22 using a coil spring, a gas spring, or the like (not shown). Is omitted.

  As shown in FIG. 1, the seat receiver 3 is a disk-like one that supports the seat 4 on the upper surface, and its front end side is supported by the support base 2 so as to be movable back and forth, and its rear end side is the back support rod. 5 is supported so as to be capable of relative rotation in the vicinity of the base end. With this configuration, the seat 4 disposed on the seat receiver 3 sinks at a constant angle ratio with respect to the back tilting operation of the backrest 6, in other words, a synchro tilting operation is realized. It has become.

  As shown in FIG. 1, the armrest 9 includes an elbow strut 91 whose base end is attached to the seat support 3 and an elbow rest 92 supported by the elbow strut 91. The left and right armrests 9 have a symmetrical shape.

  As shown in FIG. 1, the back support rod 5 is generally L-shaped in a side view, and a lower back frame 52 whose base end is attached to the main shaft 22 of the support base 2 so as to be able to tilt backward, An upper back frame 51 attached to the tip of the lower back frame 52 via a support shaft 53 so as to be able to tilt backward is provided. The lower back frame 52 is made of metal, and the outside is covered with a cover 521. The outer surface of the cover 521 is provided so as to extend forward from a position continuous with the outer surface of the upper back frame 51 to the lower surface of the seat 4. The upper back frame 51 is integrally formed of synthetic resin, and extends substantially vertically when the backrest 6 is in a standing state, and supports the upper portion of the backrest 6 with this upper end portion. That is, in this embodiment, the lower part of the backrest 6 is fixed to the lower back frame 52, while the upper part of the backrest 6 is supported by the upper back frame 51 so as to be slidable in the vertical direction. In addition, the upper back frame 51 can be tilted within a certain angle range independently of the lower back frame 52, and the upper back frame 51 can be tilted with respect to the lower back frame 52. The upper back frame 51 is elastically biased forwardly by a spring (not shown) with respect to the lower back frame 52. In this embodiment, a tilting prohibiting mechanism (not shown) is provided between the lower back frame 52 and the support base 2, and a free locking state that allows the lower back frame 52 to tilt with respect to the support base 2, or the lower back frame 52 is desired. An arbitrary position fixed state in which tilting is prohibited at an angle of can be taken. Since the structure of the tilt prohibiting mechanism is a normal one, description thereof is omitted.

  The backrest 6 is formed by mounting a back unit 8 on the front surface of the back outer shell 7 as shown in FIGS.

  As shown in FIGS. 1 to 3 and 5, the back outer shell 7 is an integrally molded product made of synthetic resin, and has a protruding top portion that protrudes most forward in the middle in the vertical direction, from the protruding top portion. A shell main body 70 having a curved shape rearward is mainly formed, and a lower attachment portion 71 and an upper attachment portion 72 for attaching the back outer shell 7 to the back support rod 5 on the back side of the shell main body 70. It has. The lower mounting portion 71 protrudes rearward from the lower portion of the shell body 70 and is fixed to the upper end portion of the lower back frame 52 using a fastening tool such as a screw. The upper mounting portion 72 has a concave shape for accommodating the slide engagement mechanism C, and the back outer shell 7 and the back support rod 5 are connected via a slide engagement mechanism C (not shown) mounted on the upper mounting portion 72. An upper end portion of the upper back frame 51 is connected to be movable in the vertical direction.

  An upper end mounting portion 73 and a lower end mounting portion 74 for mounting the back unit 8 are provided on the front side of the back outer shell 7. The upper end mounting portion 73 is formed by projecting a plurality of hooking claws 731 on the upper portion of the shell main body 70 at intervals in the left-right direction. The lower end attaching portion 74 includes a central projecting portion 741 having a bifurcated portion projecting from the lower center of the shell main body 70, and claw receiving portions 742 provided at both lower ends of the shell main body 70.

  As shown in FIGS. 2 to 4, the back unit 8 includes a back inner shell 81, a headrest 82 directly supported by the back inner shell 81, and a bag-like exterior that encloses the headrest 82 and the back inner shell 81. And a material 83.

  As shown in FIGS. 3 to 6, the back inner shell 81 is an integrally molded product made of a synthetic resin having substantially the same outer shape as the back outer shell 7, and is a protrusion that protrudes most forward in the middle in the vertical direction. The shell main body 810 which has a top part and makes the shape curved back from the protrusion top part is comprised mainly. The shell main body 810 is provided with an upper end attachment portion 811 and a lower end attachment portion 812 for attaching the back unit 8 including the back inner shell 81 to the back outer shell 7. The upper end mounting portion 811 is formed by forming a plurality of claw-hanging holes 813 provided in the upper portion of the shell main body 810 corresponding to the hooking claw 731. The upper portion of the back inner shell 81 is attached to the upper portion of the back outer shell 7 so as to be relatively displaceable in the vertical direction by being hooked so as to be relatively displaceable in the vertical direction. The lower end mounting portion 812 includes a center insertion portion 814 provided at a lower center portion of the shell body 810 and claw portions 815 provided at both lower side portions of the shell body 810. The central insertion portion 814 has a horizontal member 817 disposed at an intermediate position of the window 816, and the bifurcated portion of the central protrusion 741 of the back outer shell 7 inserted into the window 816 is engaged with the horizontal member 817. In other words, the center of the lower end of the back inner shell 81 is moved to the lower end of the back outer shell 7 while prohibiting operations other than slight rotation and bending, in other words, relative movement in the surface direction and the thickness direction. I try to install it impossible. Further, the claw portion 815 has a tip bent outward, and the claw portion 815 is engaged with the claw receiving portion 742 of the back outer shell 7 by using the temporary elastic deformation of the back inner shell 81. In other words, the lower end of the back inner shell 81 is attached to the lower end of the back outer shell 7 while prohibiting operations other than slight rotation and bending, in other words, in a plane direction and a thickness direction so that relative movement is impossible. I am doing so.

  Here, the chair according to the present embodiment is characterized in that the headrest 82 is directly supported by the back inner shell 81 configured as described above. Specifically, a separate headrest 82 is directly supported by the shell body 810 of the back inner shell 81.

  Hereinafter, the configuration of the headrest according to the present embodiment will be described in detail.

  As shown in FIGS. 3 to 8 and FIG. 11, the headrest 82 is an integrally molded product made of synthetic resin, and has a headrest main body 823 and a bent portion 822 bent in a side view from the lower end edge of the headrest main body 823. And a base 821 provided in a plate shape.

  The headrest body 823 is curved so that the central portion projects forward in a side view and the central portion is recessed in a plan view, and includes a plurality of horizontal slits 825 in parallel. The slits are provided by projecting slits 825a from the opening end to the back side.

  The bent portion 822 is formed at a boundary portion between the headrest body 823 and the base 821, and has a bent shape so that the front side is recessed in a square shape when viewed from the side. The curved shape on the back side of the bent portion 822 is matched with the curved shape of the upper edge of the back inner shell 81. Specifically, the bent portion includes a cushion pull-in portion 824 positioned on the front side that is recessed from the side, and a mounting step portion 828 that is positioned on the back side and is mounted on the upper edge of the back inner shell 81. And have. The lead-in portion 824 is inserted through the wire groove 826 for positioning the wire 83w for forming the boundary 833 by pressing the cushion 831 together with the tension fabric 832 when attaching the exterior material 83, and the string 83t for pulling the wire 83w. And a string insertion hole 827. The mounting step portion 828 has a shape protruding in a side view on the back side of the bent portion 822. By doing so, in the state where the mounting step 828 is placed on the upper side of the back inner shell 81, the surface profile on the back side when the headrest 82 is directly supported by the back inner shell 81 is The outer shape is formed so that 832 fits smoothly and smoothly.

  The base 821 is a plate-like member that can be attached to the front surface of the back inner shell 81 and is attached in close contact with the shell body 810 of the back inner shell 81 using a plurality of bolts b. Specifically, the base 821 is fixed to the back inner shell 81 by screwing bolts b penetrated from the back side of the inner shell 81 to nuts N attached to a plurality of locations of the base 821. It has become.

  Therefore, in the present embodiment, by setting the specific shape of the headrest 82 as shown in FIG. 5, FIG. 6, FIG.

  That is, as shown in the figure, the headrest body 823 has a shape curved in a side view, and the base 821 has a shape curved in a plan view so as to be in close contact with the shell body 810 of the back inner shell 81. By doing so, since the headrest 82 is integrally formed via the bent portion 822, even if the base 821 that is curved in plan view is formed thin, the headrest 82 is curved in the side view. Since it is continuous with the main body 823, it is finished to be more difficult to bend in plan view than the thickness of the synthetic resin.

  On the other hand, the headrest body 823 is specifically bent as seen from the side as shown in FIG. 11A, and is also bent as shown in FIG. Realizes the desired shape. In particular, as shown in FIG. 5A, the front surface 823a and the rear surface 823b, which form the outer shape of the headrest body 823, are formed with different curvatures. Specifically, on the front surface 823a side, a relatively large curvature is formed, and by setting the curvature of the region extending from the middle in the vertical direction slightly upward, the load from the front obliquely upward to the headrest body 823 is increased. It is easy to receive suitably. The thickness of the resin of the headrest main body 823 is substantially constant over the entire region, but the outer shape of the rear surface 823b is formed by projecting the rib 825a from the periphery of the slit 825 toward the rear surface 823b so as to protrude from the upper side to the lower side. The curvature is set to be small. By doing so, the tension fabric 832 when the exterior material 83 is wrapped is stretched without “slack” or slack. In addition, the rib 825b in the lower half of the rear surface 823b protrudes greatly, so that the thickness in side view is set to be substantially large. Therefore, rigidity is ensured as long as it is sufficient to receive a load received from obliquely above the front surface 825a while reducing the amount of resin used by stealing meat by the slit 825. Furthermore, since the protruding dimension of the rib 825a is small on the upper side of the headrest body 823, the headrest body 823 is easily bent partially in accordance with the load of the seated person, and can provide a suitable feel to the seated person's head together with the exterior material 83. Yes.

  In the embodiment, in order to make the mounting portion for directly supporting the base 821 on the back inner shell 81 as thin as possible, the following component mounting structure A is adopted. As shown in FIGS. 7, 8 and 9, the component mounting structure A is for mounting a nut N as a mounted component on a base 821, and has a main recess A11 and a sub-recess in the base 821. A12 is provided adjacently via a partition wall A13, and a part holding claw A15 is provided to engage a nut N inserted into the main recess A11 using elastic deformation of the partition wall A13. That is, the nut N is of a so-called T-type nut type in which a flange N2 is provided at one end of a shaft-shaped nut body N1. The main concave portion A11 has a bottom with which the flange portion N2 can be fitted, and has a through portion A14a for penetrating the nut main body N1 to the back side of the base 821 at the center of the bottom wall A14. . The sub-recess A12 is a pair of long holes provided so as to penetrate the back surface side of the base 821 on both sides of the main recess A11. The partition wall A13 is formed between the main recess A11 and the paired sub-recesses A12, A12, and has a thickness that can be elastically deformed in the thickness direction. A claw A15 protruding from the front side of 821 is provided. When the nut N is inserted into the main recess A11, these claws A15 are engaged with the outer surface side of the flange portion N2 by using temporary elastic deformation of the partition wall A13, and the nut N is It can be held in the recess A11.

  The exterior material 83 is attached to the back inner shell 81 and the headrest 82 that are integrated with each other in this manner.

  As shown in FIGS. 1 to 4, the exterior material 83 includes a cushion 831 made of molded urethane or the like, and a tension fabric 832 that covers the surface side of the cushion 831. The exterior material 83 is drawn into the back inner shell 81 side at the bent portion 822 of the headrest 82, and a boundary 833 that partitions the headrest main body region and the back inner shell region is formed. The configuration of the portion corresponding to the lead-in portion 824 of the exterior material 83 will be specifically described as follows. In other words, the exterior material 83 is a bag-shaped member including a front surface portion 83F for covering the front surface of the back unit 8 and a back surface portion 83B for covering the back surface of the back unit 8, and includes a headrest 82 and a back inner shell. The lower side is opened so that 81 can be wrapped from the upper side. The back surface portion 83B has an upper opening 83B1 corresponding to the upper end mounting portions 73 and 811, a lower opening 83B2 corresponding to the lower end mounting portions 74 and 812, and an intermediate opening 83B3 corresponding to the engagement mechanism C described later. Is drilled.

  Thus, in the present embodiment, a pull-in wire 83w is sewn into a portion corresponding to the boundary 833 of the front surface portion 83F, and the portion corresponding to the boundary 833 of the front surface portion 83F is defined using the wire 83w. It can be pulled into the bent portion 822. Further, a string 83t for pulling the wire 83 into the wire groove is attached to the middle two places of the wire groove, for example.

  In the chair configured as described above, the lift restriction that restricts the relative separation in the thickness direction while allowing the relative movement in the surface direction to the back outer shell 7 at the portion located between the upper part and the lower part of the back inner shell 81. It is supported via an engagement mechanism C. The engaging mechanism C includes a receiving portion C1 provided on the back inner shell 81 side and a plurality of cantilever elastic pieces C11 that are elastically deformable in the thickness direction and arranged in a truncated cone shape, and the back outer shell 7 side. And an engaging hole C12 formed by a free end edge C111 of the cantilever elastic piece C11, and a projection C2 that engages using the elastic deformation of the cantilever elastic piece C11. Specifically, the receiving portion C1 is formed integrally with the base 821 of the headrest 82 that is immovably attached to the back inner shell 81 so that the free end C111 side comes forward from the base end edge. A plurality of cantilevered elastic pieces C11 inclined to each other are arranged in a frustoconical shape bulging forward. Further, holes for opening the receiving portion C1 to the back side of the back unit 8 are provided in portions corresponding to the receiving portion C1 in the back inner shell 81 and the back surface portion 83B of the exterior material 83, respectively. The protrusion C2 inserted through these holes is engaged with the receiving portion C1. The protrusion C2 protrudes from the front side of the back outer shell 7, and has a shaft portion C21 slightly smaller in diameter than the engagement hole C12 and the engagement hole C12 provided at the tip of the shaft portion C21. And a retaining collar C22 that is larger than the inner diameter. The protrusion C2 may be provided integrally with the back outer shell 7 or may be provided separately.

  In the chair constructed as described above, the headrest 82 is attached to the back inner shell 81, the back inner shell 81 and the headrest 82 are wrapped with the exterior material 83, and the boundary 833 of the exterior material 83 is drawn into the bent portion 822. Complete the spine unit 8 with.

  Specifically, as schematically shown in FIG. 5, the wire 83w and the wire groove 826 are positioned when the exterior material is covered from above the headrest, and the string is a pair of holes from the front. The wire 83w draws the tension and the cushion over substantially the entire width direction by passing through the insertion holes and connecting at the rear of the bent portion, that is, at the position of the mounting step portion 828, thereby forming a boundary 833 of the exterior material. Will be.

  After that, the back unit 8 is attached to the front surface of the back outer shell 7. In attaching the back unit 8 to the back outer shell 7, first, the upper end mounting portion 811 of the back inner shell 81 is engaged with the upper end mounting portion 811 of the back inner shell 81, and the lower end mounting portion 812 of the back inner shell 81 is engaged with the back. The lower end mounting portion 74 of the outer shell 7 is engaged. In this state, the intermediate portion of the back unit 8 is pressed toward the back outer shell 7 so that the projection C2 is engaged with the receiving portion C1 of the engagement mechanism C.

  Next, the operation of this chair will be described. When the tilt prohibiting mechanism (not shown) is operated and set to the free locking state, a load is applied to the backrest 6, so that the entire back support 5 against the urging force of the tilt reaction force generating mechanism against the support base 2. You can tilt backwards. In addition, the seat 4 also performs a sync tilt operation. On the other hand, when the tilt prohibiting mechanism is operated and set to a fixed state at an arbitrary position, a load is applied to the backrest 6, whereby the lower back frame 52 is fixed to the support base 2, and only the upper back frame 51 is the lower back frame. The tilting is allowed with respect to 52.

  Thus, in a chair that can be used by switching to various modes, various loads act on the back outer shell 7 and the back inner shell 81 of the backrest 6. In particular, in this embodiment, since the backrest 6 is supported by the single back support 5, a torsional load or the like may act on the back outer shell 7 and the back inner shell 81. However, in this chair, since the back outer shell 7 and the back inner shell 81 are connected at the upper end portion and the lower end portion, the back outer shell 7 and the back inner shell 7 are compared with the case where both the shells 7 and 81 are completely integrated. The degree of freedom of deformation of the inner shell 81 can be increased. That is, both shells 7 and 81 cooperate with each other to bend back and forth, but against left and right torsion, both shells 7 and 81 move relative to each other in the surface direction and flexibly deform. For example, it is possible to impart various deformation characteristics to the backrest 6. Moreover, in this chair, since the engagement mechanism C is used in the middle part of the shells 7 and 81, the relative separation in the front-rear direction is limited while allowing relative movement in the surface direction. Although the deformation can be realized, the intermediate portion can be prevented from being lifted. Further, since the receiving portion C1 has a truncated conical shape, when the back inner shell 81 is attached to the back outer shell 7, even if there is a slight misalignment between the center of the receiving portion C1 and the center of the protrusion C2. By pressing both, the tip of the projection C2 is guided to the engagement hole C12 of the receiving portion C1, and the engagement can be completed. Therefore, even when the engagement mechanism C is not visible, it can be easily attached only by the pressing operation.

  With the configuration as described above, the chair according to the present embodiment directly supports the headrest 82 on the back inner shell 81, so that the headrest 82 is naturally in response to the detailed movement of the upper body of the seated person. It is possible to respond to the movements of the subtle and promptly. By doing so, a chair with a headrest 82 is realized that can favorably support the head without impairing the sitting comfort of the seated person with the back in the back inner shell 81.

  In this embodiment, the headrest 82 is attached to the base 821 for attaching to the shell main body 810 in order to realize the attachment of the headrest 82 that can effectively avoid impairing the operation of the back inner shell 81.

  In order to apply the cushion 831 similar to the back inner shell 81 to the headrest 82 with a simple structure, in this embodiment, the retracted portion of the cushion 831 is formed in the bent portion 822 on the front side which is recessed in the bent portion 822 in a side view. 824 is provided. In particular, the lead-in portion 824 is provided with a wire groove 826 for positioning the wire 83w for pressing the cushion 831 and the tension fabric 832 and a string insertion hole 827 for inserting the string 83t for pulling the wire 83w. The upholstery 832 and the cushion 831 can be quickly and reliably attached.

  In this embodiment, the headrest 82 is attached to the back inner shell 81 by providing a mounting step 828 that protrudes in a side view for mounting on the upper edge of the back inner shell 81 on the back side of the bent portion 822. In addition, positioning can be performed quickly and reliably.

  In this embodiment, since the base 821 has a plate shape that can be in close contact with the shell body 810, the headrest 82 can be attached without impairing the seating feeling with respect to the back inner shell 81.

  In this embodiment, the shape of the headrest 82, which is an integral molding of resin, is a shape obtained by curving the headrest body 823 in a side view and a shape obtained by curving the base 821 in a plan view. The strength of the base 821 is effectively secured.

  In order to enable the back inner shell 81 included in the back unit 8 to move in a faithful manner to the upper body of the seated person, in the present embodiment, the upper end of the back unit 8, that is, the back inner shell 81, is The outer shell 7 is attached in a state in which the movement in the surface direction with respect to the back outer shell 7 is allowed. By doing so, the headrest 82 positioned at the upper end of the back unit 8 can perform a fine operation according to the movement of the upper body of the seated person.

  Although the embodiment of the present invention has been described above, the specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above embodiment, a mode in which the headrest is a separate body from the back inner shell has been disclosed. Moreover, specific aspects, such as a headrest main body, a bending part, and an exterior material, are not limited to the thing of the said embodiment, The thing of various aspects including an existing thing is applicable.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

7 ... Back outer shell 81 ... Back inner shell 82 ... Headrest 821 ... Base 822 ... Bending part 823 ... Headrest body 824 ... Retraction part

Claims (7)

A back outer shell and a back inner shell attached to the inner surface of the back outer shell,
The back inner shell is provided with a headrest attaching portion, and the headrest attached to the headrest attaching portion can be directly supported by the back inner shell.
The headrest is integrally formed, a headrest body for supporting the head of the seated person, a plate-like base for mounting in close contact with the front surface of the back inner shell mounting portion, and the headrest body And a bent portion obtained by bending the base in side view . The chair according to claim 1, wherein the bent portion has a cushion pull-in portion on a front surface side that is recessed in a side view in the bent portion . The chair according to claim 2, wherein the retracting portion includes a wire groove for positioning a wire for pressing the cushion, and a string insertion hole for inserting a string for pulling the wire . The bent portion has a mounting step portion protruding in a side view for mounting on the upper edge of the back inner shell on the back side of the bent portion, and on the back side of the back inner shell and the headrest. The chair according to claim 1, 2 or 3, wherein the surface is formed continuously . The chair according to claim 1, 2, 3, or 4, wherein the headrest body and the base are integrally formed to have a shape in which the headrest body is curved in side view and the base is curved in plan view . A back unit that can be attached to the back outer shell is configured by attaching a cushion with the head rest supported by the back inner shell, and then covering the back inner shell, the headrest and the cushion with a tension fabric. The chair according to claim 1, 2, 3, 4 or 5 . The chair according to claim 6, wherein the upper end of the back unit is attached to the back outer shell in a state in which movement in the surface direction of the back outer shell is allowed .

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