JP5474118B2 - Chair - Google Patents

Description

  The present invention relates to a chair used in an office or the like, and more particularly, to a chair and a back that allow an optional member to be appropriately attached to the back.

When an optional member such as a headrest is attached to the back in a state where the tension member is attached to the back frame constituting the back, the optional member is attached to the back frame so as to partially cover the tension member, or in Patent Document 1 or the like As shown in the drawing, an option mounting frame is branched from the back frame and taken out rearward, and an optional member is usually mounted on the frame.

JP 2006-110004 A

  However, in the former configuration, the tension material may be damaged or the usability may be impaired, and in the configuration of Patent Document 1 designed to avoid this, a different frame protrudes behind the back frame. Therefore, it is not smart and there is a waste that the frame exists in the same state even when the headrest is not attached.

  The present invention has been made paying attention to such a problem, and an object thereof is to newly provide a chair or the like having a new structure for appropriately attaching an optional member to the back.

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

That is, the chair of the first invention in the present application has an optional mounting portion formed on a part of the back, and an optional member can be mounted using the optional mounting portion, and at least a part of the optional mounting portion. Is a groove formed so as to extend along the edge of the spine, and the optional member has a pair of opposed parts, and at least one opposed part is inserted into the groove. The option mounting portion is sandwiched by both opposing portions so that it can be attached to the back, and the size of the opposing portion inserted into the groove in the groove extending direction is set smaller than the length of the groove. characterized in that it was.

  With this configuration, the design effect can be enhanced by the groove provided on the back, and an optional member can be appropriately used while ensuring the appearance of a smart back with no need for providing a different frame. It can be attached to the back.

In the chair of the second invention in the present application, an optional attachment portion is formed on a part of the back, and an optional member can be attached using the optional attachment portion . It is constituted by a groove formed so as to extend along the edge of the spine at two positions displaced from each other, and the optional member has a pair of opposed parts, and both opposed parts are arranged in the groove. It is designed to be installed across both grooves by being inserted into the inside of the groove, and the dimension in the groove extending direction of the facing portion to be inserted into the groove is set to be smaller than the length of the groove. Features.

  Even in such a configuration, as in the chair of the first invention, the design effect can be enhanced by the groove provided on the back, and it is unnecessary to provide a different frame, etc., and it is smart without waste. The optional member can be appropriately attached to the back while ensuring the appearance of the back.

Further, based on the configuration of the chair of this second invention, the specific structure for mounting the optional member more appropriately, the optional member is allowed to insert a portion facing twin side inside the groove In this state, it is preferable that the optional attachment portion is sandwiched between these opposing portions so that the option attachment portion can be attached to the back.

In the chair of the third invention in the present application, an optional attachment portion is formed on a part of the back, and an optional member can be attached using the optional attachment portion, and the optional member is a pair of opposed portions. And the optional mounting portion includes two grooves corresponding to the opposing portions formed so as to extend along the edge of the spine, and the optional member is disposed inside the corresponding groove. In the state where each facing portion is inserted, the optional mounting portion is sandwiched by both facing portions so that it can be attached to the back, and the dimension in the groove extending direction of the facing portion to be inserted into the groove, It is characterized by being set smaller than the length of the groove.

Even in such a configuration, as in the chairs of the first and second inventions, the design effect can be enhanced by the two grooves, and it is unnecessary and unnecessary to provide a different frame. It is possible to appropriately attach the optional member to the back while ensuring the appearance of the smart back without any gaps .

Regardless of the configuration of the first to third inventions described above, the optional member can be appropriately attached from the back side, and in order to obtain a better appearance, It is preferable that at least a part is formed on the back side of the back.

Further, as a structure for making the mounting state of the optional member more reliable, a concave portion that is wider inward than the opening edge is formed between the opposed portions, and the concave portion is gradually widened to gradually increase the optional member. It is preferable that the optional member is mounted by narrowing the concave portion after receiving the mounting portion.

Furthermore, in order to effectively realize a positioning structure such as a protrusion or a hole on the back surface without exposing an optional member, thereby preventing damage to the appearance of the back when the optional member is not attached, It is preferable to provide a positioning portion for positioning the optional member in the direction in which the groove extends.

In order to make it possible to appropriately attach an optional member such as a lumbar support, for example, the option mounting portions are formed on the left and right edge portions of the spine, and each option mounting portion formed on the left and right edge portions is provided. It is preferable that one option member can be attached to the back in a form extending over both option attaching portions while simultaneously using the portions.

In order to achieve a more specific structure for appropriately attaching optional members to the back while ensuring the appearance of the smart back without waste as described above, it is also necessary to suppress damage to the tension material constituting the back. It is preferable that the optional member can be attached while avoiding interference with a tension member constituting a part of the member.

In the chair of the fourth invention in the present application, an optional attachment portion and a tension member attachment portion, at least a part of which is a groove extending along the edge of the back, are integrally formed and When the tension member constituting the portion is attached to the tension member attachment portion, the tension member does not block the groove constituting the option attachment portion, and the option member has a pair of opposing portions, and at least With one of the opposing portions inserted into the groove, the optional mounting portion is sandwiched between the opposing portions so that the option mounting portion can be attached to the back, and the groove extending direction of the opposing portion to be inserted into the groove The dimension is set to be smaller than the length of the groove.

Even when configured in this way, as in the above-described configuration, while maintaining the appearance of a smart back with no waste and realizing a structure for appropriately attaching optional members to the back, the tension material constituting the back Damage can also be suppressed.

It is also preferable that a plurality of option members can be simultaneously attached to the grooves constituting the option attaching portion.

  Since the present invention has the configuration described above, it is possible to appropriately attach an optional member while forming a back with a smart design and a high design effect by forming an optional mounting portion on a part of the back. A useful chair can be provided.

The side view which shows the chair which concerns on one Embodiment of this invention. The rear view. The rear perspective view. The perspective view which shows the mechanism part of the embodiment. The exploded view of FIG. The perspective view which looked at the back support rod of the embodiment from the inside. The perspective view which looked at the back support rod of the embodiment from the outside. Sectional drawing of the principal part of the same back support. The figure explaining the opening direction of the opening part with respect to the same back support. The partial expansion perspective view which shows the back support rod attaching part of the embodiment. The partial expansion perspective view which shows the groove structure of the back frame which concerns on the embodiment in a headrest part. Sectional drawing corresponding to FIG. The figure which shows the attachment structure to the back lower side part of the tension material in the embodiment. The rear view of the chair of the state which attached the optional member. The principal part enlarged view. The figure which shows the modification of this invention. The figure which shows the modification of this invention. The figure which shows the modification of this invention. The figure which shows the modification of this invention. The figure which shows the modification of this invention. The figure which shows the modification of this invention. The figure which shows the modification of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 5, the chair according to this embodiment rotates the back support rod 3 on both sides of the chair body in which the base 2 is rotatably attached to the leg blades 11 via the support 12. The seat 4 and the back 5 are associated with the base 2 and the back support rod 3 so as to be capable of being synchronized with tilting.

  The base 2 is composed of a support base 21 rotatably attached to the support column 12 and a seat mounting portion 22 disposed on the support base 21. The support base 21 has a support projecting laterally from the base. A base end 3 a of the back support rod 3 is rotatably attached via a shaft 61. The seat mounting portion 22 has a front portion connected to the front end of the support base portion 21 via a slide mechanism including a long hole 21a and a pin 22a, and a rear portion supported on a support shaft 62 constructed between a pair of back support rods 3. It connects so that it can rotate through 22b. Then, with the seat 4 attached to the seat mounting portion 22 and the back 5 attached to the extended end 3b of the back support rod 3, the back support rod 3 is tilted backward about the support shaft 61, whereby the arrow in FIG. As shown, the rear portion of the seat mounting portion 22 is moved rearward and downward by the support shaft 62, and the front portion of the seat mounting portion 22 is moved rearward by a sliding motion in the long hole 21a of the pin 22a. A synchro tilt operation in which the rearward tilting operation of 5 and the rearward downward sinking operation of the seat 4 are interlocked is caused. The base 2 itself does not incorporate a lock mechanism for locking the spine 5.

  In such a configuration, the present embodiment enables the back support rod 3 to be directly attached to the back support rod 3 while making the back support rod 3 compact and smart, and directly attaches an optional member such as a headrest to the back 5. To get you attached.

  In this embodiment, the back support rod 3 is made of aluminum die-casting, and as shown in FIGS. 6 to 8, at least the main body 3c has a substantially U-shaped cross section over almost the entire area, and appears in FIG. Inner openings 3d and 3f are integrally formed in the inwardly U-shaped part, and outer openings 3e are integrally formed in the outwardly U-shaped part appearing in FIG.

  The main body 3c has a substantially rectangular parallelepiped shape composed of an inner wall 31, an outer wall 32, an upper wall 33, and a bottom wall 34. These wall surfaces extend linearly along the longitudinal direction of the back support rod 3, and A first inner opening 3d is formed on the extended end 3b side, an outer opening 3e is formed at a position adjacent to the base end side, and a second inner opening 3f is formed at a position adjacent to the base end side. The first inner opening 3d functions as a back support rod attaching portion, and is partitioned by an outer wall 32, an upper wall 33, a bottom wall 34, and a partition wall 35 as shown in FIGS. 8 (a) and 8 (b). The cross section is inwardly U-shaped and opens toward the inside and the extended end. The outer opening 3e functions as an elbow attachment, and as shown in FIGS. 8A and 8C, the outer opening 3e is crossed by an inner wall 31, an upper wall 33, a bottom wall 34, and a pair of partition walls 35 and 36. It has an outward U-shape and is open to the outside. As shown in FIGS. 8A and 8D, the second inner opening 3f has a U-shaped cross section inwardly defined by an outer wall 32, an upper wall 33, a bottom wall 34, and a pair of partition walls 36 and 37. It is open to the inside. The inner side of the second inner opening 3f is further divided into four small openings by a vertical partition wall f1 and a horizontal partition wall f2, which is a stealing for making the wall thickness uniform.

  That is, the outer wall 32 of the back support rod 3 exists as a back standing wall inside the first inner opening 3d, and the inner wall 31 of the back support rod 3 serves as a back standing wall inside the outer opening 3e. The screw holes 3d1 and 3e1 for attaching the back support rod 3 and the elbow 6 are provided in the standing vertical walls, respectively.

  For example, in the first outer opening 3e shown in FIG. 7, the upper and lower portions of the pair of partition walls 35 and 36 are connected to each other by the upper wall 33 and the bottom wall 34 of the back support frame 3, respectively. In the second inner opening 3f shown in FIG. 6, if the vertical partition wall f1 and the horizontal partition wall f2 are ignored, the upper and lower portions of the pair of partition walls 36 and 37 are respectively separated from each other. Connected by the upper wall 33 and the bottom wall 34 of the support 3, the inner periphery is entirely closed in a circular shape. Of course, all the inner peripheries of the small openings that subdivide the inside opening 3f are also closed. These structures are effective in securing the strength of the opening. Since the first inner opening 3e needs to insert a protrusion 54 of the back 5 described later, the inner periphery opens to the rear end side. Since the interior is filled densely with the five protruding portions 54 inserted, there is no problem in strength.

  On the other hand, as shown in FIGS. 8A and 8B, the inner peripheries of the inner openings 3d and 3f have a tapered shape that gradually decreases toward the outer side, and the inner peripheries of the outer openings 3e gradually open toward the inner side. The inner taper shape is a mold (part shown) that is configured by setting a parting line at a position that passes through substantially the center of the outer wall 32 and the inner wall 31 of the back support rod 3. (Omitted).

  As shown in FIGS. 5 to 7, the back support rod 3 has a bearing portion 71 through which the support shaft 61 is inserted into the upper wall 33 in the vicinity of the base end 3 a, and the upper wall 33 in the vicinity of the extended end 3 b. Each of the bearing portions 72 through which the support shaft 62 is inserted is formed by providing a raised portion by molding and mounting a resin bush. A rotation restricting pin 63 (see FIGS. 1 and 5) that restricts the rotation range of the spine 5 is inserted into the shaft hole 73 located on the base end 3 a side so as to protrude from the support base 21.

  In the above, not only the inner wall 31, the outer wall 32, the upper wall 33, the bottom wall 34, and the partition walls 35 to 37 of the main body portion 3 c of the back support rod 3, but also the shaft hole 73 and the bearing portions 71 and 72 of the base end portion 3 a. If the entire region of the back support rod 3 including the periphery of the holes to be formed is a molded body having an equal thickness, and the holes forming the shaft hole 73 and the bearing portions 71 and 72 are also considered as inner openings, these inner openings The cross section is U-shaped in almost all regions including the portion.

  As shown in FIGS. 4 and 9 and the like, the pair of back support rods 3 formed in this manner is attached to the base 2 in a state where the distance between the pair of back supports 3 extends from the base end 3a toward the extension end 3b. However, the opening direction of each of the openings 3d, 3e, and 3f is set to be parallel to the spine width direction (in other words, the direction of the support shafts 61 and 62). For this reason, when viewed from the back support rod 3, as shown in FIG. 9, for example, the direction in which the elbow 6 is inserted into the opening 3d (that is, the opening direction of the opening 3d) is the longitudinal direction of the back support rod 3. A certain angle is formed with respect to the orthogonal direction.

  As shown in FIG. 1, the back support rod 3 formed in this way is extended to the rear of the seat 4 so that its extended end 3 b does not become higher than the seat surface.

  Then, as shown in FIGS. 1, 4 and 5, the spine 5 is directly attached to the extended ends 3b of the pair of back support rods 3 distributed to the left and right sides of the base 2 as described above.

  The back 5 is formed by resin integral molding as shown in FIGS. 1 to 3, and is a single-turn frame-like back frame 5 x composed of an upper frame part 51, a lower frame part 52, and left and right side frame parts 53, The side frame 53 is formed in the shape of a substantially U-shape in which a substantially middle position in the vertical direction protrudes most forward in a side view, and is composed of a tension member 5y provided on the inner side of the back frame 5x. And the lower frame part 52 has comprised the curved shape from which a plane cross section becomes concave toward the front, as shown in FIG.4, FIG.5 and FIG.10. And the back support rod connection part 54 is integrally formed in two places right and left in the front side of the said lower frame part 52 located in the lower part of the spine 5. FIG.

  The back support rod connecting portion 54 is integrally provided with a projection 54a from the front surface of the lower frame portion 52 toward the front, and the first inner opening 3d that opens the projection 54a at the extended end 3b of the back support rod 3. And a bolt is inserted from the inside into a through hole 54b provided in a part of the projection 54a so as to be fastened to the female thread 3d1 (see FIG. 8) of the back support rod 3. The stepped portion 54a1 provided on the protrusion 54a in the fitted state is abutted against the end surface 3b1 of the extended end 3b of the back support rod 3. As shown in FIG. 1, the back support rod 3 extends substantially linearly in the side view in the rear direction, and in this embodiment, the spine 5 is attached to the extended end 3b at the shortest distance. As shown in FIG. 2, the position of the back support rod 3 in the width direction is a portion below the seat 4 and entering inward from the side edge. The position in the front-rear direction is based on the position shown in FIG. The end 3a is the approximate center of the seat 4 in the front-rear direction and a slightly forward portion of the support column 12.

  On the other hand, this chair usually takes out the back locking mechanism which is normally configured in the base 2 to the outside of the base 2, and as shown in FIGS. For this purpose, as shown in FIGS. 4 and 10, etc., a lock mechanism attaching portion 55 is provided at the center in the width direction of the lower frame portion 52 located at the lower side portion of the back 5.

  In forming the lock mechanism mounting portion 55, paying attention to the fact that the flat cross section of the lower frame portion 52 of the spine 5 is curved in a concave shape toward the front, and when the spine 5 is viewed from the side, A pair of upper and lower horizontal ribs 56a and 56b are provided in a state where they are not projected forward. These lateral ribs 56a and 56b extend at both ends along the lower frame portion 52 and are connected to a pair of left and right projecting portions 54a constituting the aforementioned back support rod connecting portion 54. And the lock mechanism attaching part 55 is formed between these horizontal ribs 56a and 56b.

  As shown in FIG. 10, the lock mechanism attaching portion 55 is provided with a pair of vertical ribs 55a facing each other in the back width direction while being supported by the horizontal ribs 56a and 56b as shown in FIG. When a shaft hole 55c is formed as a bearing portion through which the shaft 55b is inserted, the vertical rib 55a is also viewed from the side in relation to the flat cross section of the lower frame portion 52 being curved forward. It is configured to fit in the recess.

  Then, one end 7a of the gas spring mechanism 7 is rotatably supported by a support shaft 64 provided at the rear part of the base 2 as shown in FIGS. 1, 3, 4, 10 and the like, and a shaft formed at the other end 7b. The hole 71 is inserted between the left and right vertical ribs 55a constituting the lock mechanism mounting portion 55 to match the shaft holes 55c formed in the vertical ribs 55a, and in that state, the shaft 55b is inserted from the side and inserted into these. The gas spring mechanism 7 is attached between the base 2 and the spine 5 by passing it through.

  That is, when the back support rod 3 rotates around the support shaft 61 together with the back 5, the gas spring mechanism 7 having one end 7a attached to the support shaft 64 behind the support shaft 61 has the back 5 to which the other end 7b is attached. The lock mechanism mounting portion 55 is compressed as it gradually approaches the support shaft 64, and is locked again at a required compression position, so that the back seat is held in an appropriate synchronized tilt state. When the locked state is released, the returning force to the posture of FIG. 1 is developed.

  Furthermore, as shown in FIGS. 11 and 12, the back 5 described above is integrally formed with a tension member attaching portion 57 and an option attaching portion 58.

  Specifically, the outer periphery of the upper frame portion 51 and the left and right side frame portions 53 of the back frame 5x are substantially extended so as to extend along the circumferential direction of the back frame 5x, that is, along the edge of the spine 5. Two grooves 57a, 58a are formed in parallel over the entire area, and the groove 57a located at the front functions as a tension member attaching portion 57 by itself, and an option such as a headrest 81 is provided on the groove 58a located at the rear. The optional mounting portion 58 for mounting the member 8 plays a role.

  That is, in this embodiment, a tension member 5y in which a plate-like attachment piece 5y2 is integrally formed around the mesh ground 5y1 is prepared, and the attachment piece 5y2 of the extension member 5y is provided as the upper frame portion 51 and the left and right side frame portions. 53, and the lower end of the tension member 5y is fixed by an appropriate structure, for example, a hook claw 52a provided on the lower frame portion 52 of the back 5 as shown in FIG. Thus, the upholstery material 5y is attached to the front portion of the spine 5. In this state, as shown in FIG. 1, the front groove 57a is closed by the tension member 5y on the side surface of the back frame 5x and the like, and the rear groove 58a circulates in a slit shape. That is, even when the tension member 5y is attached, the groove 58a is not blocked by the tension member 5y, and is maintained open to the outside.

  At this time, as shown in the cross section of the back frame 5x in FIG. 12, a gap S is formed between the tension member 5y and the front surface 5x1 on the inner peripheral side of the back frame 5x. There is a portion, and the inner peripheral side of the back frame 5x including this portion and the groove 58a formed on the outer peripheral side of the back frame 5x described above constitute the option mounting portion 58 of the present invention.

As an optional member 8, for example, a headrest 81 is composed of a main body attaching portion 81a and a clamping piece 81c that is attached to and detached from the main body attaching portion 81a by a screw 81b, and the upper frame portion 51 of the back frame 5x is interposed therebetween. A pair of facing portions 81d and 81e shaped to embrace is formed, and a recessed portion 81f whose inside is wider than the opening edge is formed between the facing portions 81d and 81e. Then, after receiving the upper frame portion 51 of the back frame 5x in the portion to be the concave portion 81f while the one opposing portion 81d is inserted into the groove 58a with the clamping piece 81c detached, By inserting the clamping piece 81c and applying a tightening force in the direction of narrowing the recess 81f using the screw 81b, the upper frame portion 51 of the back frame 5x is clamped by the facing portions 81d and 81e, and the headrest 81 is The back frame 5x is attached in a state where it is held. The dimension of the facing portion 81d inserted into the groove 58a in the extending direction of the groove 58a is set smaller than the length of the groove 58a (see FIG. 11). In this way, the headrest 81 is attached across the portion facing the gap S on the inner peripheral side of the upper frame portion 51 from the groove 58 a on the outer peripheral side of the upper frame portion 51. In this state, the front surface 5x1 of the sandwiching piece 81c is smoothly continuous with the front surface of the upper frame portion 51 of the back frame 5x, and can function as a tension material receiving surface when the tension material 5y is bent. I have to.

  Incidentally, FIG. 14 shows this state as seen from the back side. In FIG. 14, a hanger 82 is also attached as another optional member 8 at the same time, avoiding interference with the headrest 81.

  As shown in FIG. 15, the hanger 82 is composed of a gate-shaped hanger body 82a and a sandwiching piece 82b that is attached to the lower ends of the two legs 82a1 of the hanger body by screws. As in the headrest 81, the mounting structure is such that the upper frame portion 51 is sandwiched between the opposing pieces and tightened using the groove 58a. The legs 82a1 are positioned on both sides of the body attachment portion 81a of the headrest 81. The hanger 82 is attached to the upper frame portion 51 of the back frame 5x located at the rearmost position of the back 5 as shown by an imaginary line in FIG. Clothes can be positioned in an empty space on the back side. Note that what is indicated by reference numeral 83 in FIG. 14 is a lumbar support shown as another optional member 8, and a groove 59 similar to the above is provided on the inner periphery of the side frame portion 53 of the back frame 5x, and both ends of the groove 59 are provided at both ends. It is shown that attachment of such a member is also possible if 83a is inserted and used at the same time and attached in a form extending over both grooves 59.

  As described above, in the present embodiment, in the chair in which the tension member attaching portion 57 is provided on a part of the back frame 5x constituting the back 5, the tension frame attaching portion 57 is provided and the tension member 5y is stretched. An option mounting portion 58 is formed on at least a part of the same circumference frame as that of 5x, and the option member 8 such as the headrest 81 can be mounted while avoiding interference with the tension member 5y by using the option mounting portion 58. Is.

  With this configuration, not only the tension member 5y but also the option member 5 such as the headrest 81 and the hanger 82 can be attached to the back frame 5x. At this time, the option attachment portion 58 and the option member are attached to the tension member attachment portion 57 and the tension member. Since it does not interfere with the material 5y, not only is there no risk of damaging the upholstery material 5y, but it is also unnecessary to provide a different frame behind the back frame 5x, and the appearance of the smart back 5 without waste is achieved. The attachment of the option member 8 can be realized while ensuring. Further, when the optional member 5 is not attached, there is only the spine 5 consisting only of the circumferential frame on which the tension member 5y is stretched, so that the problem that a special frame or the like is permanently installed without any meaning is effectively eliminated. It becomes possible.

  Specifically, the option attachment portion 58 is formed at a position adjacent to the rear portion of the tension member attachment portion 57 in the back frame 5x, and the back frame 5x itself is used properly in the front and rear regions. It is possible to realize a side-by-side structure of the tension member 5y and the optional member 8 on the common back frame 5x.

  Further, since the tension member attaching portion 57 is formed along the circumferential direction of the back frame 5x and the option attaching portion 58 is also formed in parallel with this, the option attaching portion 58 is provided at any position of the back frame 5x. Can be closely positioned so as not to stand out from the upholstery attachment portion 57, and the smart appearance of the back frame 5x can be secured.

  In particular, since the upholstery attachment portion 57 and the option attachment portion 58 are provided over substantially the entire area of the upper frame portion 51 and the left and right vertical frame portions 53 along the circumferential direction of the back frame 5x, the back frame 5x is wide. By attaching the tension member 5y over the range, the attachment state can be stabilized, and the attachment position of the option member 8 and the type of the option member 5 to be attached can be given a degree of freedom. That is, in the illustrated example, the headrest 81 and the hanger 82 are attached to the upper frame portion 51. However, as shown in FIG. 14, an optional attachment portion such as a groove 83 is set on the inner peripheral side of the side frame portion 53 to increase the lumbar support. It is possible to easily perform such a manner that the position can be changed.

  In particular, since at least a part of the option mounting portion 58 is a groove 58a extending along the outer periphery of the back frame 5x, the groove 58a is formed in a slit shape (joint shape) on the outer periphery of the back frame 5x with the tension member 5y attached. A design effect that gives a slender and smart impression on the back frame 5x can be achieved.

  Further, as a specific attachment structure of the option attachment portion 58, the option member 8 is attached to the back frame 5x by holding the back frame 5x with the option member 8 such as the headrest 81. Since it can be firmly attached, and it is only necessary to attach the optional member 8 so that the back frame 5x is sandwiched, the attachment and detachment can be performed by a simple operation.

  In the present embodiment, a gap S is formed in the front surface on the inner peripheral side of the back frame 5x between the upholstery material 5y and the upholstery material 5y with the upholstery material 5y attached thereto. Paying attention to the presence of a part to be mounted, a groove 58a is formed in which at least a part of the option mounting portion 58 is formed on the outer peripheral side of the back frame 5x, and the optional member 8 such as the headrest 81 is spaced from the outer peripheral groove 58a to the inner peripheral clearance S. Therefore, the option mounting structure can be effectively realized only by forming the groove 58a on the outer periphery.

  In particular, the grooves 57a and 58a of the present embodiment are provided in a state where they are not visible from the front and back, so how the tension member 5y is attached or where and how the optional member 8 such as the headrest 81 is attached. These attachments can be realized in a state where the attachment is not easily perceived, and the high function can be exhibited even though the spine 5 has no change at first glance.

  Furthermore, in the attachment of the headrest 81, the back frame 5x has a pair of opposing portions 81d and 81e, and the back frame 5x can be sandwiched between the opposing portions 81d and 81e. It is effective as an avoiding mounting structure, and can be reliably attached to the back frame 5x.

  In this case, a concave portion 81f that is wider inward than the opening edge is formed between the facing portions 81d and 81e. After the concave portion 81f is gradually expanded to receive the back frame 5x, the concave portion 81f is narrowed. Since the tightening force is applied to the option member 5, the option member 5 can be reliably prevented from dropping once tightened, and it is possible to ensure the mounting state. In particular, since the concave portion 81f has an irregular shape together with the cross section of the back frame 5x, the mounting state becomes more stable.

  Of course, since the feature of this embodiment is the back 5, the chair of the present invention can be effectively configured only by using the back 5 in place of the back of an existing chair.

  When the chair of this embodiment as described above is viewed from another point of view, an option attachment portion 58 is formed on a part of the back 5 and the option member 8 can be attached using the option attachment portion 58. In addition, at least a part of the option mounting portion 58 is a groove 58a provided on the spine 5, and the option member 8 has a pair of opposing portions 81d and 81e, and one of the opposing portions 81d is a groove. It can be said that it is attached to the spine 5 by sandwiching the option attachment portion 58 between the opposing portions 81d and 81e in a state of being inserted into the inside of 58a.

  With this configuration, the design effect can be enhanced by the groove 58a provided in the spine 5, and the appearance of the smart spine 5 without waste is also eliminated without providing a different frame. While securing, it becomes possible to attach the optional member 8 to the back appropriately.

  Furthermore, since the groove 58a constituting the option mounting portion 58 is formed so as to extend along the edge portion of the spine 5, the above effect can be further enhanced.

  Further, a concave portion 81f that is wider inward than the opening edge is formed between the facing portions 81d and 81e. After the concave portion 81f is gradually expanded to receive the option mounting portion 58, the concave portion 81f is narrowed. Since the optional member is attached, the optional member 8 can be reliably prevented from falling off, and the attached state can be made more reliable.

  Further, since the optional member 8 can be attached while avoiding interference with the tension member 5y constituting a part of the spine 5, there is no risk of the tension member 5y being damaged, and there is a difference behind the back frame 5x. The effect of realizing the attachment of the option member 8 while ensuring the appearance of the smart back 5 without waste is also made more concrete.

  Further, as described with reference to FIG. 14, the option mounting portions 58 are formed on the left and right edge portions of the spine, respectively, and the option mounting portions 58 formed on the left and right edge portions are used simultaneously, Since one lumbar support 83 is configured to be attached to the spine 5 in a form extending over the option mounting portion 58, even when the lumbar support 83 is used as the option member 8, it is appropriately attached. Is possible.

  When the chair according to the present embodiment is seen from another viewpoint, this means that at least a part of the chair 58 is a groove 58a extending along the edge of the spine 5 and an upholstery mounting portion 57. Are integrally formed, and when the upholstery material 5y constituting a part of the back 5 is attached to the upholstery attachment portion 57, the groove 58a constituting the option attachment portion 58 is closed by the upholstery material 5y. It can be said that there was no configuration.

  Since it is configured in this manner, as described above, the tension member constituting the spine 5 is realized while realizing the structure for appropriately attaching the optional member 8 to the spine 5 while ensuring the appearance of the smart spine 5 without waste. It can be said that the effect that the damage of 5y can also be suppressed is obtained.

  The specific configuration of each part 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, as shown in FIG. 16, even if the same groove 157 is used, if the interference between the tension member 5y and the option member 8 does not interfere (that is, does not interfere with each other), the tension member attachment portion and the groove 157 as the option attachment portion are formed. It can also be shared. Of course, as in the groove 257 shown in FIG. 17, a portion functioning as the tension attachment portion and a portion functioning as the option attachment portion may be separated by providing the inside in a stepped manner.

  In addition, as shown in FIG. 18, grooves 358a and 358b constituting the option mounting portions are formed at two positions displaced toward the outer peripheral side and the inner peripheral side of the back frame 5x, respectively, and are opposed to the inside of these grooves 358a and 358b. The option mounting portion may be sandwiched in a state where the portions 81d and 81e (see FIG. 12) are inserted, and the option member 8 may be mounted across both the grooves 358a and 358b.

  That is, an option mounting portion 58 is formed on a part of the back 5, and the option member 8 can be mounted using the option mounting portion 58, and the option mounting portion 58 is provided on the back 5. Even if it is configured by the grooves 358a and 358b formed at two positions that are displaced from each other and the option member 8 is configured to be mounted across the grooves 358a and 358b, the same applies. Further, the design effect can be enhanced by the grooves 358a and 358b provided in the spine 5, and the optional member 8 can be provided while ensuring the appearance of the smart spine 5 without waste by providing different frames. Can be properly attached to the back.

  Furthermore, since the grooves 358a and 358b constituting the option mounting portion 58 are formed so as to extend along the edge portion of the spine 5, the above-described effect can be further enhanced.

  Further, the option member 8 has a pair of facing portions 81d and 81e. With the facing portions 81d and 81e inserted into the grooves 358a and 358b, the facing portions 81d and 81e The above-described configuration is effectively realized by being attached to the back 5 by sandwiching the option attaching portion 58.

  When such a configuration is viewed from another point of view, an option mounting portion 58 is formed on a part of the back 5 and the option member 8 can be mounted using the option mounting portion 58. The option mounting portion 58 includes two grooves 358a and 358b corresponding to the respective facing portions 81d and 81e, and the option member 8 is disposed inside the corresponding grooves 358a and 358b. It can be said that the option mounting portion 58 is sandwiched between the opposing portions 81d and 81e in a state where the opposing portions 81d and 81e are inserted. It can be said that it is possible to appropriately attach the optional member 8 to the back while ensuring the appearance of the smart back 5 without any gap.

  Further, the groove is not necessarily provided on the inner peripheral side of the back frame, and may be provided on the back side as in the case of the groove 358c in FIG. That is, by forming the groove 358c on the back side of the spine 5, the option member 8 can be appropriately attached from the back side, and a better appearance can be obtained. Of course, as shown in FIG. 14, there may be a mode in which the groove 59 is provided only on the inner peripheral side and the optional member is attached without interfering with the tension member 5y.

  Further, as shown in FIG. 20A, an unevenness-related portion 458y is provided in the groove 458, and an unevenness-related portion 8y that engages with the optional member 8 is provided on the corresponding side of the optional member 8, and these unevenness-related portions 458y. , 8y are engaged in the groove 458 so that the option member 8 can be positioned along the circumferential direction of the groove 458. In this way, the optional member 8 can be positioned at a predetermined position of the back frame 5x without exposing the structure for positioning projections and holes on the surface of the back frame 5x. It is possible to effectively improve the appearance of the spine 5 when the 8 is not attached. In the drawing, the unevenness-related portion 458y on the groove 458 side is concave and the unevenness-related portion 8y on the option member 8 side is convex, but the unevenness relationship may be reversed. Further, in the drawing, the unevenness-related portion 458y on the back frame 5x side is provided on the vertical surface in the groove 458, but of course, an aspect provided on the bottom surface, a mode provided on a portion extending from the vertical surface to the bottom surface, etc. are also possible. The 8 side unevenness related portion 8y may be provided corresponding to this. FIG. 6B shows an example of this, and an unevenness-related portion provided with a concave-convex-related portion 458y2 having a triangular cross-section that protrudes upward on the bottom surface of the groove 458, and is cut out in a triangular shape on the corresponding optional member 8 side. 8y2 is provided, and the effect of positioning the option member 8 while guiding the option member 8 to a predetermined position of the back frame 5x by the uneven portions 458y2 and 8y2 as the option member 8 is fitted into the groove 458 is achieved.

  Further, as shown in FIG. 21, the cross-sectional shape of the back frame 105x is deformed in a predetermined region along the circumferential direction, and the concave portion 108a of the option member 108 is also deformed corresponding to the cross-sectional shape of the back frame 105x at a predetermined mounting position. Since the option member 108 is adapted to the back frame 105x only after the option member 108 is disposed at the original mounting position, the positioning of the option member 108 to the predetermined position of the back frame 105x is not performed on the back frame 105x. This can be performed without exposing the positioning structure such as a hole, and it is possible to effectively avoid damage to the appearance of the spine 5 without the optional member 108 attached.

  Furthermore, as shown in FIG. 22, it is possible to attach the option member 208 to the back frame 205x so that a part of the option member 208 is held by the back frame 205x. According to this, since a part of the option member 208 enters and is attached to the back frame 205x, it is possible to conceal the attachment part and contribute to improvement in appearance.

  The optional mounting portion 458 in the illustrated example has a groove shape that is wider inward than the opening edge, and can be mounted so as to hold the base end widened portion 208x of the optional member 208 on the inner periphery of the groove. The base end widened portion 208x can be easily brought into close contact with the inner wall of the opening edge by a method such as inserting and rotating from the opening edge and rotating and applying an appropriate detent.

5 ... Back 5x ... Back frame 51 ... Upper frame portion 53 ... Side frame portion 57 ... Upholstery attachment portion 58 ... Option attachment portion

Claims (11)

An optional attachment part is formed on a part of the back, and an optional member can be attached using the optional attachment part,
A groove formed so that at least a part of the optional mounting portion extends along the edge of the back;
The option member has a pair of facing portions, and is attached to the back by sandwiching the option mounting portion by both facing portions in a state where at least one facing portion is inserted into the groove. has been way,
A chair characterized in that a dimension of the facing portion to be inserted into the groove in the groove extending direction is set smaller than the length of the groove . An optional attachment part is formed on a part of the back, and an optional member can be attached using the optional attachment part,
The optional mounting portion is constituted by a groove formed so as to extend along the edge of the spine at two locations where the spine is displaced from each other,
The optional member has a pair of opposing portions, and is attached across both grooves by inserting both opposing portions into the groove ,
A chair characterized in that a dimension of the facing portion to be inserted into the groove in the groove extending direction is set smaller than the length of the groove . Claim wherein the optional member is, for the opposite portion of the bi-lateral in a state of being inserted into said groove, characterized in that it has to be attached to the spine by sandwiching the option attachment portion by these facing portions 2. The chair according to 2. An optional attachment part is formed on a part of the back, and an optional member can be attached using the optional attachment part,
The optional member has a pair of opposing portions;
The optional mounting portion includes two grooves corresponding to the opposing portions formed so as to extend along the edge of the spine ;
The optional member is attached to the back by sandwiching the optional mounting portion by both opposing portions in a state where each opposing portion is inserted into the corresponding groove ,
A chair characterized in that a dimension of the facing portion to be inserted into the groove in the groove extending direction is set smaller than the length of the groove . The chair according to any one of claims 1 to 4 , wherein at least a part of the groove is formed on the back side of the back. A concave portion that is wider inward than the opening edge is formed between the opposed portions, and after the concave portion is gradually widened to receive the optional mounting portion, the concave portion is narrowed to attach the optional member. It performs, The chair in any one of Claims 1-5 characterized by the above-mentioned. The chair according to any one of claims 1 to 6 , wherein a positioning portion for positioning an optional member in a direction in which the groove extends is provided inside the groove. The optional mounting portions are respectively formed on the left and right edges of the back,
While utilizing the optional mounting portion formed on the left and right edges simultaneously claims, characterized in that the one of the optional member in a form over the option attachment portion both have to be attached to the back 1-7 A chair according to any of the above. The chair according to any one of claims 1 to 8 , wherein the optional member can be attached while avoiding interference with a tension member constituting a part of the back. The optional attachment part and the tension material attachment part, at least a part of which is a groove extending along the edge of the back, are integrally formed, and the tension material constituting a part of the back is used as the tension material attachment part. When installed, the tension material does not block the grooves that make up the optional mounting part .
The option member has a pair of facing portions, and at least one facing portion is inserted into the groove, and the option mounting portion is sandwiched by both facing portions to be attached to the back. The chair is characterized in that the dimension of the facing portion inserted into the groove in the groove extending direction is set smaller than the length of the groove . The chair according to any one of claims 1 to 10, wherein a plurality of option members can be simultaneously attached to a groove constituting the option attachment portion.

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