JP6121685B2 - Chair - Google Patents

Description

  The present invention relates to a chair in which optional members such as hangers and headrests are attached to the back side of the backrest.

  In recent years, chairs have been developed in which an optional member such as a hanger or a headrest is attached to the back side of the backrest to expand the use of the chair and improve its convenience. Such an optional member is manufactured separately from the chair, and is generally fixed to the back side of the backrest of the chair. As these optional members, for example, there is a chair in which an optional member having a hanger function and an optional member having a headrest function are simultaneously disposed on the back side of the backrest (see Patent Document 1 below).

Japanese Patent No. 5007444

  In this chair, a box-shaped mounting portion having an inner peripheral space is provided on a frame on which a tension material is stretched, and two types of optional members, a hanger and a headrest, are fitted and fitted to the mounting portion, respectively. It is attached to the back side of the backrest. This structure is excellent in that each of the two different members can be individually attached and detached by attaching them in a different manner to the common attachment portion.

  However, since the mounting part prepared on the back side of the backrest is a structure for fixing the hanger, the headrest and the respective supporting parts by internal fitting, external fitting, etc., two pieces are attached to this mounting part. Not only can it be used to fix an excess number of optional members, but when only the optional hanger or headrest is attached to the fixed mounting portion, the mounting portion (fixed portion) and one optional member are supported. It is necessary to fix the cover member or the like with respect to the gap formed between the parts, and if the cover member or the like is not fixed, the support strength of the optional member is lowered.

  In view of the above problems, the present invention provides a chair having a structure in which the number of optional members to be attached can be freely selected and in which no gap is formed between the support portion of the optional member and the fixing portion on the back side of the backrest. The purpose is to do.

In order to solve the above problems, the chair of the present invention is:
In a chair in which a plurality of optional members can be attached to the back side of the backrest,
A fixing portion is provided on the back surface of the backrest, and each of the plurality of option members includes a support portion that can be superposed in the front-rear direction, and the fixing portion on the back surface of the backrest and the support portions of the plurality of option members Are provided on both the front and rear surfaces of the support portion of the option member, respectively, and the overlap surface of the concave portion and the overlap surface of the convex portion are provided, and these overlap surfaces are provided on the support portions of all the option members. common with is formed in the polymerization surface of the concave portion aspects to the fixed part of the backrest of the rear side is formed is characterized in Rukoto.
According to this feature, since the support portions of the plurality of option members are overlapped in the front-rear direction and supported by the backrest fixing portion, it is only possible to fix and fix without limiting the number of attachments of the option members. In addition, no gap is formed between the support portion of the optional member and the fixed portion on the back side of the backrest, and the support strength can be ensured. Further, the arrangement order of the optional members attached to the fixed portion on the back side of the backrest can be freely selected, and the fixed portion on the back side of the backrest and the support portion of the optional member can be fixed by uneven fitting.

The chair of the present invention
The support portions of the plurality of option members are characterized by having overlapping surfaces for connecting the support portions by concave-convex fitting.
According to this feature, the support parts of the option member are connected by the concave-convex fitting, so that the positioning of the two parts is facilitated, and the contact area between the overlapping surfaces is increased, thereby enhancing the mutual support strength. it can.

The chair of the present invention
The fixing portion on the back side of the backrest is characterized by having a superposed surface that can be connected to the support portion of the option member by concave and convex fitting.
According to this feature, the fixed part on the back side of the backrest and the support part of the optional member are connected by the concave and convex fitting, so that the positioning of both is facilitated and the contact area between the overlapping surfaces is large. The mutual support strength can be increased.

The chair of the present invention
The back surface of the support part of the optional member is formed as a concave surface overlapping surface, and has a decorative cap provided on the front with a convex surface overlapping surface that can be unevenly fitted with the concave surface overlapping surface. It is a feature.
According to this feature, the superposed surface on the back side of the option member at the rearmost end which is superposed and fixed can be easily concealed by the decorative cap.

The chair of the present invention
The fixing portion on the back side of the backrest is provided with a female screw portion, and the support portions of the plurality of option members are provided with through holes at common positions, and through the through bolts that are inserted through the through holes. It is characterized in that the fixed part on the back side of the drooping and the supporting parts of the plurality of optional members can be fixed integrally.
According to this feature, the option member to be polymerized can be easily and strongly fixed to the fixing portion on the back side of the backrest.

It is a front view which shows the chair in an Example. It is a side view which shows a chair. It is a rear view which shows a chair. It is a perspective view which shows a hanger apparatus. It is a front view which shows a hanger main body. It is a front view which shows a cylindrical member. It is a rear view which shows a cylindrical member. (A) is a side sectional view showing an AA section in Drawing 4 of a hanger device, and (b) is an upper sectional view showing a BB section similarly. It is a figure explaining attachment to the backrest of a hanger device and a headrest device. It is a top sectional view showing a state of superposition of a hanger device, a headrest device, and a backrest.

  EMBODIMENT OF THE INVENTION The form for implementing the chair which concerns on this invention is demonstrated below based on an Example.

  The chair according to the embodiment will be described with reference to FIGS. Hereinafter, the left side of FIG. 2 and FIGS. 7, 8, 12 (a), 15 and 16 will be described as the front side of the chair, and the lower side of FIG. 8 (b) will be described as the front side of the chair.

  Reference numeral 1 in FIG. 1 is a chair to which the present invention is applied. The chair 1 is provided with a leg 4 having five leg rods 3 each having a caster 2 at a distal end portion thereof, and a gas spring (not shown) housed in the center of the leg 4. Telescopic base 5, front base 6 with the rear end fixed to the upper end of the base 5, a seat 7 supported above the base 6, and extending in the left-right direction in the front-rear direction A backrest support rod 9 pivotally attached to both the left and right sides of the support base 6 with a pivotable shaft 8 and having a substantially L shape in side view, and a backrest 10 supported on the upper rear end of the backrest support rod 9. An armrest support column 11 that extends vertically on the left and right sides of the seat 7 and has a lower end fixed to the left and right sides of the backrest support rod 9; an armrest 12 fixed to the upper end of the armrest support column 11; A hanger device having a hanger body 14 as an optional member provided at the upper part on the back side of the flange 10 It is equipped with a 3 and.

  As shown in FIGS. 1 to 3, the support base 6 has a box shape extending in the front-rear direction, and a known biasing means for constantly biasing the seat 7 toward the front side direction, for example, A compression coil spring as described in Japanese Patent Application Laid-Open No. 2005-212244 and an adjusting means (both not shown) for adjusting the urging force of the compression coil spring are accommodated. Note that these urging means and adjusting means are not directly related to the present invention, and a specific configuration and detailed description thereof will be omitted.

  The seat 7 is attached so as to cover a seat frame 15 having a frame shape in a top view, a synthetic resin seat plate (not shown) attached to the seat frame 15, and an upper surface and an outer peripheral surface of the seat plate. And the cushioning material 16 formed.

  Further, on the front part and the rear part of the seat frame 15, both side parts are inclined upward, and the intermediate part is fixed to a horizontal ridge that is spaced downward from the seat frame 15 and extends in the left-right direction. Further, an intermediate portion of the front side ridge 17 on the front side is urged in the front side direction by a compression coil spring provided on the support base 6. Further, an intermediate portion of the rear side reed (not shown) on the back side is rotatably connected to a bracket (not shown) provided on the back side slightly from the shaft 8 of the back support rod 9. When 10 is inclined in the back side direction together with the back support rod 9, the rear portion of the seat 7 is moved downward on the back side.

  Along with the movement of the rear part of the seat 7, the front lateral rib 17 is slid downward on the back side against the urging force of the compression coil spring, and the front part of the seat 7 is also moved downward on the back side. By doing in this way, the return turning power to the front side direction of the backrest 10 by the urging force of the compression coil spring and the returning force to the upper side of the front side of the seat 7 can be obtained, and the sitting comfort for the seated person can be obtained. improves.

  As shown in FIG. 2, the backrest support rod 9 is extended in the front-rear direction and the rear side is curved upward. The shaft 8 is fixed to the front end portion of the backrest support rod 9. Then, the shaft 8 is pivotally attached to the front side slightly from the pedestal column 5 on the upper surface of the support base 6, so that the backrest support rod 9 can be rotated in the vertical direction around the shaft 8. Further, a fixed piece (not shown) having a substantially inverted L shape in a side view is attached to the rear end portion of the backrest support rod 9.

  The backrest 10 includes a back frame 18 made of a hard synthetic resin having a substantially rectangular frame shape in which an opening surface communicating in the front-rear direction gradually narrows downward, and a front surface of the opening surface of the back frame 18. It consists of a tension member 19 stretched on the side. Further, the tension member 19 is stretched on the opening surface in a state in which the mesh material is processed into a square shape and is tensioned vertically and horizontally. The upholstery material 19 may be made of a material other than the mesh material, for example, a woven fabric or a canvas.

  The backrest frame 18 includes a pair of left and right side frame ridges 20, 20 that gently bend so that a portion slightly below the center in the vertical direction protrudes to the front side, and the upper ends of the side frame ridges 20, 20 And a lower frame that connects the lower end portions of the left and right frame rods 20 and 20 in a substantially straight line. It consists of 杆 22.

  Further, a forward piece (not shown) extending toward the front side is integrally formed on the lower frame rod 22. The forward piece is screwed to the upper surface of the backrest support rod 9, and the fixed piece of the backrest support rod 9 is screwed to the lower surface of the lower frame rod 22. Thereby, the backrest frame 18 is firmly attached to the backrest support rod 9.

  Further, as shown in FIG. 9, a central portion on the back side of the upper frame collar 21 of the backrest frame 18 has a trapezoidal shape that extends in the left-right direction and whose lower side is gradually smaller than the upper side. A recessed fixing portion 24 (fitting recess 52) that is recessed in the direction is formed. The fixing portion 24 can be fitted with a fitting convex portion of an optional member to be described later. Furthermore, a trapezoidal inner recess portion having a slightly smaller shape than the shape of the fixing portion 24 is formed inside the fixing portion 24, and the outer periphery of the inner recess portion and the outer periphery of the fitting convex portion are formed. The surface between the two is the overlapping surface 27 of the concave portion according to the present invention. In addition, two through holes 25 penetrating into the inside of the upper frame ridge 21 are formed on the inner side of the recess.

  Next, the hanger device 13 as an optional member according to the present invention will be described. As shown in FIG. 4, the hanger device 13 includes a hanger body 14 that is arranged on the back side of the chair 1 and on which clothes are hung, a tubular member 28 that supports the hanger body 14 and is attached to the back side of the chair 1, It comprises an adjustment tool 38 for adjusting the height position of the hanger body 14. The hanger body 14 and the cylindrical member 28 are made of a synthetic resin material, for example, a processing material such as polystyrene, polypropylene, acrylonitrile-butadiene-styrene resin, or the like.

  Further, the hanger body 14 includes a hanger portion 66 that extends in the left-right direction to a length that allows a suit or the like to be hung, and an attachment portion 31 that extends downward from the center portion of the hanger portion 66. Yes. The hanger portion 66 has a plate shape facing upward in front view and rear view, and has a warped portion 67 whose end portion on the front side bends downward in side view, and has an upward convex shape as an overall shape. It becomes the plate-shaped body which has the curved curvature of becoming. The upper surface of the plate-like body has a round shape in accordance with the shape of the clothes hung on the hanger portion 66 (see FIG. 9), so that the clothes can be hung without breaking the shape. .

  Further, a slit-like opening 69 extending in the left-right direction is provided in the center in the front-rear direction and the left-right direction of the hanger part 66 so as to communicate with the up-down direction of the plate-like body forming the hanger part 66. The part 69 can be used as a part for hanging a tie, a stall, a shawl or the like.

  On the other hand, as shown in FIG. 5 and FIG. 8B, the attachment portion 31 has a substantially U shape whose inner surface faces the front side in a top sectional view and penetrates in the front-rear direction at the center in the width direction. A support groove 36 extending in the vertical direction is provided. In addition, on the front side of the mounting portion, a plurality of latching step portions 37 that can be latched on an upper surface of a latching portion 39 of an adjusting tool 38 to be described later are provided at predetermined intervals in the vertical direction.

  Next, the cylindrical member 28 of the hanger device 13 will be described with reference to FIGS. The cylindrical member 28 includes a cylindrical portion 42 having an inner circumferential space whose upper and lower ends are open, and a continuous extension from the upper end portion of the cylindrical portion 42 toward the front side. It has the support part 45 which makes the plate shape which faces.

  As shown in FIG. 6, the cylindrical portion 42 is formed with a slit-like fastening hole 47 extending in the vertical direction slightly above the center on the front side, and the tip of the adjusting tool 38 to be described later is fastened. It has come to be. Further, as shown in FIG. 7, on the back side of the tubular part 42, the position facing the fastening hole 47 provided on the front side penetrates the inner peripheral space from the back side of the tubular part 42. The insertion part 50 is formed. In addition, an adjustment tool 38 to be described later can be inserted into the insertion portion 50 from the outer peripheral side of the back surface of the cylindrical portion 42.

  Further, as shown in FIG. 8, the inner circumferential space of the cylindrical portion 42 has a shape corresponding to the mounting portion 31 of the hanger body 14 described above, and the inner wall surface and the mounting portion on the back side of the cylindrical portion 42. The attachment portion 31 is movable in the vertical direction with respect to the tubular member 28 while being in sliding contact with the outer peripheral surface of the back surface of 31.

  And as shown in FIG. 6, the support part 45 extended continuously toward the front side upper direction from the upper end of the cylindrical part 42 has comprised the plate shape which faces the front-back direction. On the front side of the support portion 45, a convex fitting convex portion 23 is formed that extends in the left-right direction and has a trapezoidal shape in which the lower side gradually becomes smaller than the upper side and protrudes in the front side direction. The fitting convex portion 23 has a shape corresponding to the fixing portion 24 so as to be fitted inside the fixing portion 24 described above. Furthermore, the inner surface of the fitting convex portion 23 is formed in parallel with the above-described concave surface-like overlapping surface 27 so as to be in close contact with each other. It becomes the superposition | polymerization surface 27 '. Further, on the inner surface of the fitting convex portion 23, two through holes 25 ′ penetrating to the back side of the support portion 45 are formed on the left and right sides at a common position corresponding to the through hole 25 of the backrest 10. Yes.

  On the other hand, on the back side of the support portion 45, as shown in FIG. 7, a fitting recess similar to the fixing portion 24 of the backrest 10 so as to surround a through hole 25 ′ penetrating from the front side of the support portion 45. 52 'is formed, and a concave surface-like overlapping surface 27' 'having the same shape as the fixing portion 24 is formed.

  Further, as shown in FIG. 8, the adjustment tool 38 extends in a vertical direction from a circular flange portion 53 having an outer diameter that can be inserted into the insertion portion 50 and a central portion on the front side of the flange portion 53. An operating rod 54 is provided. Then, an adjustment tool 38 is inserted into the insertion portion 50 of the cylindrical member 28 at the front end of the operation rod 54 on the front side of the flange portion 53, and the adjustment tool 38 is attached to the back surface by a coil spring 60 as a biasing means. A fastening portion 57 that is fastened to the fastening hole 47 on the front side of the tubular member 28 in a state of being biased is provided.

  Furthermore, the operating rod 54 is provided with a latching portion 39 that protrudes in the left-right direction and can be engaged with the latching step portion 37 described above. As shown in FIG. 8B, the hook 39 has an adjustment tool 38 inserted into the insertion portion 50 of the tubular member 28, and the adjustment tool 38 is attached in the back direction by a coil spring 60 as a biasing means. In a state of being biased, it is arranged so that the latching step portion 37 of the hanger body 14 is engaged with the upper surface of the latching portion 39, and the adjustment tool 38 is pressed by the user or the like from the back side and the latching portion. In a state where 39 is moved to the front side, it is arranged so that the engagement between the latching portion 39 and the latching step portion 37 is released.

  Further, when the adjustment tool 38 is attached to the hanger device 13, the adjustment tool 38 is adjusted in a state where the insertion hole 41 of the attachment portion 31 of the hanger body 14 and the insertion portion 50 of the tubular member 28 are overlapped. The adjustment tool 38 is inserted into the insertion portion 50 from the outer peripheral side of the tubular member 28 together with the coil spring 60 as an urging means extending in the front-rear direction. Then, when the fastening portion 57 is fastened to the fastening hole 47, the adjustment tool 38 is urged toward the back side by the coil spring 60, while being prevented from coming off from the insertion portion 50.

  Furthermore, when the height of the hanger body 14 is adjusted, the back surface of the adjustment tool 38 is pressed by the user, so that the hooking portion 39 of the adjustment tool 38 is moved in the front direction, and the hooking is stopped. The engagement between the portion 39 and the latching step portion 37 of the hanger body 14 is released, and the hanger body 14 is movable in the vertical direction with respect to the tubular member 28. Then, when the hanger body 14 is slid in the vertical direction with respect to the tubular member 28 and the hanger body 14 reaches the position desired by the user and the pressing of the adjustment tool 38 is released, the hanger body 14 is It cannot move with respect to the cylindrical member 28, and is stably fixed in the vicinity of a user's desired position.

  Next, the headrest device 26 as an optional member will be described with reference to FIG. The headrest device 26 includes a plate-like support portion 61 that is attached to the backrest 10 and faces in the front-rear direction, and a headrest main body 59 that extends upward from the support portion 61.

  The supporting portion 61 of the headrest device 26 is formed with a fitting convex portion 23 ′ having the same shape as the fitting convex portion 23 of the supporting portion 45 of the cylindrical member 28 and protruding in the front side direction on the front side thereof. Yes. Furthermore, the inner surface of the fitting convex portion 23 is formed in parallel with the above-described concave-convex overlapping surfaces 27, 27 '' so as to be in close contact with each other, and the concave-convex overlapping surfaces 27, 27 ' It is a superposed surface 27 ″ ″ that can be polymerized with '(see FIG. 10). Further, on the inner surface of the fitting convex portion 23 ′, two through holes 25 ″ penetrating to the back side of the support portion 45 are formed on the left and right sides at a common position corresponding to the through hole 25 of the backrest 10. Has been.

  On the other hand, on the back side of the support portion 61 of the headrest device 26, a fitting recess 52 similar to the fixing portion 24 of the backrest 10 is enclosed so as to surround the through-hole 25 '' penetrating from the front side of the support portion 61. ”Is formed, and a concave surface overlapping surface 27 ′ ″ having the same shape as the fixing portion 24 is formed.

  Since the headrest body 59 extends upward with respect to the support portion 61, the hanger device 13 and the headrest device 26 are prevented from interfering with each other, and the user can use the hanger device 13 and the headrest device 26. Convenience when using can be improved.

  Next, a method of attaching the hanger device 13 and the headrest device 26 to the backrest 10 of the chair 1 as a plurality of optional members according to the present invention will be described based on FIGS. 9 and 10. In addition, although the present Example shows the method of attaching a some option member to the backrest 10, only one option member, for example, the hanger apparatus 13, can also be attached to the chair 1 (refer FIG. 3).

  First, the fitting convex portion 23 ′ of the headrest device 26 is applied to the concave depression of the fixing portion 24 (fitting concave portion) on the back side of the backrest 10 of the chair 1 from the upper side of the rear side so that the inner side of the fixing portion 24. The fitting convex portion 23 'is fitted into. At this time, since the left and right sides of the fixing portion 24 and the fitting convex portion 23 ′ formed in a trapezoidal shape function as guides, the fitting convex portion 23 ′ can be easily fitted into the fixing portion 24. .

  Further, the fitting convex portion 23 of the hanger device 13 is fitted into the concave recess of the fitting concave portion 52 ″ of the headrest device 26 so as to be applied from above the rear side.

  Then, through bolts 62 are inserted into the through holes 25 ′ from the back side of the headrest device 26, and the nuts 58 and the through bolts 62 as the female screw portions are fastened inside the upper frame collar 21 of the backrest 10 ( (See FIG. 10). Thereby, the superposition | polymerization surfaces of several superposed | polymerized option members are connected, and it becomes impossible to drop out mutually. The through bolt 62 has a length suitable for the number of option members so as to penetrate all of the plurality of option members to be attached and be fastened to the nut 58 in the backrest 10. .

  Thereafter, a decorative cap 63 as a cover for closing the fitting recess 52 ′ of the hanger device 13 is attached from the back side of the hanger device 13. As shown in FIG. 10, the decorative cap 63 is formed in a shape that matches the concave fitting surfaces of the fitting concave portions 52 ′ and 52 ″ of the hanger device 13 and the headrest device 26. The outer peripheral surface and the inner peripheral surface are fitted into the fitting recess 52 ′. Further, the back side of the decorative cap 63 is formed in a flat plate shape. Thereby, the protrusion does not occur in the back side direction of the decorative cap 63. Note that the back surface of the decorative cap 63 may be decorated or colored, and the design recess in the support portion of the optional member can be improved by closing the rearmost fitting recess 52 ′ with the decorative cap 63. .

  Note that the fixing portion 24 of the backrest 10 and the fitting recesses 52 ′ and 52 ″ and the fitting projections 23 and 23 ″ of the optional member each have a common overlapping surface and a common overlapping surface. Since the through holes 25, 25 ′, and 25 ″ are formed at the positions, only predetermined option members can be attached to the chair 1, or the order of attaching the plurality of option members to the chair can be changed as appropriate.

  As described above, by using the overlapping connecting means shown in FIG. 10, the plurality of option members are overlapped in the front-rear direction of the chair 1 and can be supported by the backrest 10 in a state where they cannot be removed from each other.

  Thus, the fixing portion 24 is provided on the back surface of the backrest 10, and the hanger device 13 and the headrest device 26 (a plurality of optional members) are provided with support portions 45 and 61 that can be superposed in the front-rear direction, respectively. Since the fixing part 24 on the back surface of 10 and the support parts 45 and 61 of the plurality of option members can be fixed, the backrest 10 can be fixed in a state where the support parts of the plurality of option members are overlapped in the front-rear direction. Since it is supported by the portion 24, not only can the number of optional members attached be superposed and fixed, but also a gap is formed between the support portion of the optional member and the fixing portion 24 on the back side of the backrest 10. Thus, the supporting strength can be secured.

  Further, the support portions 45 and 61 of the plurality of optional members are provided with overlapping surfaces 27 ′, 27 ″, 27 ′ ″, and 27 ″ ″ for connecting the support portions by uneven fitting. Therefore, when the support parts of the option member are connected by the concave-convex fitting, not only the positioning of both is facilitated, but also the contact area between the superposed surfaces becomes large and the mutual support strength can be increased.

  In addition, the fixing portion 24 on the back side of the backrest 10 includes the overlapping surface 27 that can be connected to the support portions 45 and 61 of the optional members by fitting the concave and convex portions. By connecting the support portions 45 and 61 of the member by concave-convex fitting, not only the positioning of both is facilitated, but also the contact area between the overlapping surfaces becomes large and the mutual support strength can be increased.

  Further, the front and rear surfaces of the support portions 45 and 61 of the optional member are respectively provided with concave overlapping surfaces 27 ″ and 27 ′ ″ and convex overlapping surfaces 27 ″ and 27 ′ ″. Since the support portions 45 and 61 of all the optional members are formed in common and the concave portion-like overlapping surface 27 is formed in the fixing portion 24 on the back side of the backrest 10, the back side of the backrest 10 The order of arrangement of the optional members attached to the fixed portion 24 can be freely selected, and the fixed portion 24 on the back side of the backrest 10 and the support portions 45 and 61 of the optional member can be fixed by uneven fitting.

  Further, the back surfaces of the support portions 45 and 61 of the optional members are formed as concave-shaped overlapping surfaces 27 '' and 27 '' ', and the convex-shaped overlapping surfaces 70 that can be concavo-convexly fitted with the concave-surface overlapping surfaces are provided. Since the decoration cap 63 provided on the front surface is provided, the overlapping surface on the back side of the option member at the last end that is overlapped and fixed can be easily concealed by the decoration cap 63.

  Further, the fixing portion 24 on the back side of the backrest 10 is provided with a nut 58 (internal thread portion), and the support portions 45 and 61 of the plurality of optional members are provided with through holes 25 ′ and 25 ″ at a common position. The fixing portion 24 on the back side of the backrest 10 and the support portions 45 and 61 of the plurality of optional members can be fixed integrally with the through bolts 62 inserted through the through holes 25 ′ and 25 ′. Therefore, the option member to be polymerized can be easily and strongly fixed to the fixing portion 24 on the back side of the backrest 10.

  Further, the common shape of the fitting recesses 52, 52 ′, 52 ″ and the fitting projections 23, 23 ″ is formed in a trapezoid whose lower side is gradually smaller than the upper side. When attaching the hanger device 13 or the headrest device 26 (a plurality of optional members), each of the left and right sides forming a trapezoid is formed by fitting the fitting convex portion into the concave depression of the fitting concave portion from above the rear side. Since both sides function as a guide, the work of fitting the fitting convex portion into the fitting concave portion can be facilitated.

  Further, by using a sufficiently long through bolt 62 with respect to the number of option members attached to the chair 1, the option member on the back side is strongly fixed to the option member on the front side, and a plurality of options are provided. Since the member and the backrest 10 are integrally supported by the through bolts 62, it is possible to prevent the option member on the back side from being bent downward and attached to the backrest 10 or the option member on the front side. Thereby, even when the optional member is attached to the chair 1 by the user, the center of gravity of the entire chair is prevented from being greatly deviated from the initial design position, and the stability of the chair can be maintained.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above embodiment, the overlapping surfaces 27, 27 ′, 27 ″, 27 ′ ″, 27 ″ ″, 70 are formed in a substantially trapezoidal shape. As long as they are formed in a common shape, the overlapping surface is not limited to a substantially trapezoidal shape, and may be formed in a rectangular shape or an elliptical shape, or may be formed in a plurality of squares.

  In the above embodiment, the tubular portion 42 of the hanger body 14 extends below the support portion 45 and the headrest body 59 extends above the support portion 61. As long as the headrest device 26 and the headrest device 26 do not interfere with each other, the cylindrical portion 42 may be extended above or to the side of the support portion 45, or the headrest body 59 may be extended below or to the side of the support portion 61.

  Further, the cylindrical member 28 in the above embodiment is adapted to be attached to the backrest 10 while supporting the hanger body 14 described above. However, the cylindrical member 28 is not limited to the hanger body 14 and is a headrest body. The other optional members may be attached to the backrest 10 while being supported so as to be movable in the vertical direction.

  Moreover, in the said Example, although the concave fixing part 24 is provided in the backrest 10, while providing a convex fitting convex part in the backrest 10, a fitting recessed part is provided in the front side of another option member. A fitting convex portion may be provided on the back side.

  In the above embodiment, the decorative cap 63 is formed in a shape matching the concave fitting surface of the fitting recesses 52 ′ and 52 ″, and the decorative cap 63 is formed by the outer peripheral surface and the inner peripheral surface of the decorative cap 63. Is fitted in the fitting recesses 52 ′ and 52 ″, the decorative cap 63 is formed larger than the concave fitting surface of the fitting recess, and a hanger device or You may make it provide the fitting convex part similar to a headrest apparatus.

DESCRIPTION OF SYMBOLS 1 Chair 2 Caster 4 Leg 5 Leg column 6 Support base 7 Seat 10 Backrest 13 Hanger device 14 Hanger body (optional member)
18 Back frame 21 Upper frame collar 23, 23 'Fitting convex part 24 Fixing part 25, 25' Through-hole,
25 ″ through-hole 26 headrest device 27, 27 ″ overlapping surface 27 ′ ″, 27 ″ ″ overlapping surface 28 cylindrical member 31 mounting portion 38 adjusting tool 45 support portion 52, 52 ′ fitting recess 52 ″ Fitting recess 58 Nut 59 Headrest body 61 Supporting part 62 Through bolt 63 Decoration cap 70 Superposition surface

Claims (5)

In a chair in which a plurality of optional members can be attached to the back side of the backrest,
A fixing portion is provided on the back surface of the backrest, and each of the plurality of option members includes a support portion that can be superposed in the front-rear direction, and the fixing portion on the back surface of the backrest and the support portions of the plurality of option members Are provided on both the front and rear surfaces of the support portion of the option member, respectively, and the overlap surface of the concave portion and the overlap surface of the convex portion are provided, and these overlap surfaces are provided on the support portions of all the option members. common with is formed in the backrest of the polymerization surface of the concave portion aspects to the fixed portion of the rear side is formed chair according to claim Rukoto.   2. The chair according to claim 1, wherein the support portions of the plurality of option members are provided with overlapping surfaces for connecting the support portions by uneven fitting.   3. The chair according to claim 1, wherein the fixed portion on the back side of the backrest includes a superposed surface that can be connected to the support portion of the option member by concave and convex fitting. The rear surface of the support portion of the option member is formed as a concave-shaped overlapping surface, and has a decorative cap provided on the front surface with a convex-shaped overlapping surface that can be unevenly fitted to the concave-surface overlapping surface. The chair according to any one of claims 1 to 3 , wherein the chair is characterized. The fixing portion on the back side of the backrest is provided with a female screw portion, and the support portions of the plurality of option members are provided with through holes at common positions, and the through bolts are inserted through the through holes. The chair according to any one of claims 1 to 4 , wherein a fixing part on the back side of the backrest and a support part of the plurality of option members can be fixed integrally.

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