JP2011045567A - Swivel chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is difficult to apply high tension to spread cloth. <P>SOLUTION: A seat 5 includes: a pair of right and left seat frames 15; a flexible seat spread cloth 17 spread between both seat frames 15; and a front cross beam 21 interposed between front end parts of both seat frames 15 while forming a space 19 between the front cross beam and the seat spread cloth 17, for applying tension to the seat spread cloth 17 in the interposed state. A backrest 7 includes: a pair of right and left back frames 23; a flexible back spread cloth 25 spread between both back frames 23; an upper cross beam 29 interposed between upper parts of both back frames 23 while forming a space with the back spread cloth 25, for applying tension to the back spread cloth 25 in the interposed state; and a lower cross beam 33 interposed between lower parts of both back frames 23 in the state of being separated to the back from the back spread cloth 25, for applying tension to the back spread cloth 25 in the interposed state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a swivel chair provided with a flexible upholstery.

  2. Description of the Related Art Various types of chairs are conventionally known in which a stretch fabric is stretched between frames to form a seat or a backrest (see, for example, Patent Document 1).

  Many swivel chairs used in offices and the like have been developed in which a mesh-like tension is stretched between frames to form a seat and a backrest.

  However, since all of the conventional ones are used to stretch a tension fabric inside a frame having a predetermined shape, it is difficult to apply a high tension to the tension fabric. Therefore, there is a certain limit to realizing a comfortable chair by setting the seating surface and the backrest surface to a desired shape, and some improvement is desired.

  Especially in office swivel chairs that are used for a long time, it is required that the shape of the backrest closely follows the shape of the user's back. Since there is no tension stretching technology that can meet such demands, other optional parts such as lumbar support are used to meet the demands.

JP 2002-172039 A

  The present invention is intended to solve the above-described problems, and an object thereof is to provide a chair that can solve the problem that it is difficult to apply a high tension to a stretched fabric.

  The present invention employs the following configuration in order to solve the above-described problems. That is, the swivel chair according to the present invention comprises a leg, a support base that is pivotally supported by the leg, and a seat and a backrest supported by the support base. Is a seat frame that forms a pair of left and right, a flexible seat stretched between the seat frames, and a front end of the seat frame while forming a space between the seat frames. And a front transverse beam that applies tension to the seating ground in the interposed state, and the backrest is stretched between the back frame that forms a pair of left and right, and between these two back frames. A flexible back tension material and a space between the back support material and an upper portion of the both back frames are formed, and tension is applied to the back tension material in the interposed state. An upper horizontal beam is interposed between the lower frames of the two back frames in a state of being separated rearward from the backrest. Characterized in that in a state in which and a lower horizontal beam for imparting tension to the back coated cloth.

  Here, the upper part of the back frame refers to a part above the middle of the back frame, and the lower part of the back frame refers to a part below the middle of the back frame.

  If this is the case, the tension is applied to the tensioned fabric with the horizontal beams interposed between the pair of left and right frames, so that the tensioned fabric can be held in a shape corresponding to the left and right frames. High tension can be given. In addition, while forming a space between the cross beam and the tension fabric or in a state of being separated from the tension fabric rearward, a horizontal beam is interposed between the both frames, and tension is applied to the tension fabric in the interposed state. At the stage of attaching the tension fabric to the frame, it is possible to easily stretch the tension fabric to the frame without applying tension to the tension fabric. On the other hand, when the horizontal beam is interposed between the left and right frames, The desired tension can be given to the. That is, the space becomes a bending margin of the tension fabric, and the tension fabric can be stretched while adjusting the tension of the tension fabric. Therefore, since the upholstery is stretched inside the frame having a predetermined shape, which the conventional chair has, it is possible to solve the problem that it is difficult to apply high tension to the upholstery. It can be done.

  In such a swivel chair, the seat frame and the back frame are continuous, and even if the seat and the backrest are configured integrally, or the seat frame and the back frame May be discontinuous, and the seat and the backrest may be configured separately.

  The front horizontal beam is provided with a pair of mounting walls that are directly or indirectly in close contact with at least the inner side surfaces of the left and right seat frames at the left and right ends, and the upper horizontal beam and the lower horizontal beam are at the left and right ends. If each of the left and right back frames has a pair of mounting walls that are in close contact with the inner surface, the mounting wall presses the left and right seat frames and the back frame toward the outer surface, so Can be applied. Therefore, a high tension can be applied to the upholstery.

  The mounting wall has a shape extending along the seat frame or the back frame, and each of the mounting walls is fixed to the corresponding seat frame or the back frame using a plurality of fasteners. If so, the mounting wall can be firmly attached to the seat frame and the back frame. Therefore, the lower horizontal beam provided with the mounting wall can be firmly attached to the seat frame, and the upper horizontal beam and the lower horizontal beam can be firmly attached to the back frame.

  Further, in order to firmly attach the lower horizontal beam provided with the mounting wall to the seat frame, and the upper horizontal beam and the lower horizontal beam to the back frame, the mounting wall further extends in a direction along the seat frame or the back frame than the thickness dimension thereof. It is preferable that the longitudinal dimension is set large.

  In particular, as a suitable mode for bringing the tension of the portion where the weight is concentrated to a desired value, the back frame protrudes forward corresponding to the waist shape of the seated person in the vicinity of the lower end. There is one that has a portion and is stretched so as to form a protruding shape corresponding to the protruding portion by applying tension by the lower transverse beam to the back fabric.

  As a specific aspect of such a swivel chair, there is one in which the seat and the back are cantilevered on the support base only through the lower horizontal beam.

  Further, the seating fabric and the backpacking fabric are provided with a pushing material at the edge thereof, and the pushing material is reversed to a mounting groove continuously provided on the outer surface side of the seating frame and the back frame. It is preferable to insert a seat and a stretch fabric.

  As a concrete aspect of the seating fabric and the backing fabric, a mesh-like one can be mentioned.

  Since this invention is the above structures, the chair which can eliminate the subject that it is difficult to give high tension | tensile_strength to a tension fabric can be provided.

1 is an overall perspective view showing an embodiment of the present invention. The perspective view which abbreviate | omits and shows the front side of the embodiment partially. The disassembled perspective view which abbreviate | omits and shows the front side of the embodiment partially. The perspective view which abbreviate | omits and shows the back side of the embodiment partially. The disassembled perspective view which abbreviate | omits and shows the back side of the embodiment partially. The front view which abbreviate | omits the half part and leg body of a tension fabric and shows the same embodiment. The top view which abbreviate | omits the half part and leg body of a tension fabric and shows the same embodiment. The right view which abbreviate | omits and shows the embodiment partially. AA line end view in FIG. The BB line end view in FIG. The rear view which showed the state before tensioning of the tension fabric of the embodiment. The CC line expanded end elevation figure in FIG. The DD line enlarged end elevation in FIG. The EE line enlarged end elevation in FIG. The schematic end elevation which shows the connection part of the flame | frame and horizontal beam in other embodiment. FIG. 6 is a view corresponding to FIG. 6, illustrating a state in which the lumbar frame is mounted on the chair according to the present embodiment. FIG. 9 is a view corresponding to FIG. 8, illustrating a state in which the lumbar frame is mounted on the chair according to the embodiment.

  Hereinafter, an embodiment when the present invention is applied to an office rotary chair will be described with reference to FIGS.

  As shown in FIG. 1, the chair includes a leg 1, a support base 3 that is rotatably supported by the leg 1, and a seat 5 and a backrest 7 that are supported by the support base 3. It becomes.

  As shown in FIG. 1, the leg body 1 includes a leg blade type leg base 11 having casters 9 and leg struts 13 erected at the center of the leg base 11. The leg strut 13 is a normal one mainly composed of a gas spring, and the support base 3 is attached to the upper end of the leg strut 13.

  As shown in FIGS. 3 to 8, the support base 3 has a substantially triangular shape in plan view gradually narrowing toward the rear, and a bottom wall 3 a attached to the upper end of the leg support 13, The peripheral wall 3b is provided on the periphery of the bottom wall 3a, and the top wall 3c is attached to the upper end of the peripheral wall 3b. The support base 3 is provided with an operation lever 3d for controlling the gas spring of the leg 1.

  As shown in FIGS. 1, 3, and 6 to 8, the seat 5 includes a pair of left and right seat frames 15, and a flexible seat 17 that is stretched between the two seat frames 15. A front cross beam 21 is formed between the front end portions 15b of the both seat frames 15 while forming a space 19 between the seat stretch fabric 17 and applies tension to the seat stretch fabric 17 in the interposed state. It has.

  As shown in FIGS. 1, 3, and 6 to 8, the backrest 7 includes a back frame 23 that forms a pair of left and right, and a flexible back tension fabric 25 that is stretched between the back frames 23. And an upper horizontal beam 29 that is interposed between the upper portions 23a of the both back frames 23 while forming a space 27 between the upper and lower tension grounds 25 and applies tension to the back tension ground 25 in the interposed state. A lower horizontal beam 33 is provided between the lower portions 23b of the both back frames 23 while forming a space 31 with the back tension fabric 25, and applies tension to the back tension fabric 25 in the interposed state. It becomes.

  The seat frame 15 and the back frame 23 are continuous as shown in FIGS. 1 to 8 (the continuous seat frame 15 and the back frame 23 may be collectively referred to as “frame F”). The seat 5 and the backrest 7 are integrated. That is, the left seat frame 15 and the left back frame 23, and the right seat frame 15 and the right back frame 23 are integrally formed by integrally molding a single continuous metal material.

  As shown in FIGS. 8 to 10, mounting grooves 35 for attaching the seating ground 17 and the backrest 25 are formed on the outer side surfaces Fa of the left frame F and the right frame F, respectively. Yes. These mounting grooves 35 are arranged at positions closer to the front surface Fc than the back surface Fb of each frame F. Here, the back surface Fb means the bottom surface in the case of the seat frame 15 and the back surface in the case of the back frame 23. Further, the front surface Fc means the upper surface in the case of the seat frame 15 and the front surface in the case of the back frame 23.

  As shown in FIG. 1, FIG. 3, FIG. 6 to FIG. 8, and FIG. 11 to FIG. 13, the seat tension fabric 17 and the back fabric 25 (hereinafter may be collectively referred to as “stretch fabric M”). , Which is integrally formed by cutting a mesh-like upholstery material formed by weaving or knitting synthetic resin yarn into a predetermined shape, and existing from the front surface Ma side to the back surface Mb side as the seating surface It has translucency so that can be visually recognized.

  As shown in FIG. 11 and FIG. 13, the right and left edge portions Mc of the upholstery M are provided with a pushing member 37 having a band shape and having rigidity. The pushing member 37 is provided continuously along the edge Mc of the stretch fabric M, and is attached to one side of the edge Mc of the stretch fabric M, that is, the back surface Mb by sewing or the like. Yes. The pushing member 37 is made of synthetic resin or the like, has a thickness dimension T1 that can be inserted into the mounting groove 35, and has a width dimension W1 larger than the opening dimension in the depth direction of the mounting groove 35. I have it.

  Then, as shown in FIG. 13, each edge Mc of the tension fabric M is inverted and inserted into the attachment groove 35 provided on the outer surface Fa side of the frame F together with the pushing member 37, thereby M is stretched between the left and right frames F. In this state, a tension is applied to the tension fabric M by interposing the front horizontal beam 21, the upper horizontal beam 29, and the lower horizontal beam 33 between the left and right frames F. The tension fabric M to which tension is applied in this way is in a form along the shape of the left and right frames F. That is, the left and right back frames 23 have protrusions 23c protruding forward corresponding to the waist shape of the seated person in the vicinity of the lower ends, and the backrest 25 is tensioned by the lower horizontal beam 33. Thus, it is stretched so as to form a protruding shape corresponding to the protruding portion 23c.

  Further, the edge portions Md and Me not supported by the left and right frames F of the upholstery M are bag-shaped as shown in FIGS. 3, 11 and 12, and the edges Md and Me A transparent core member 39 is incorporated in the interior. Specifically, the edge Md of the upholstery M (sitting upholstery 17) located at the front edge of the seat 5 and the edge of the upholstery M (backing up ground 25) located at the upper edge of the backrest 7 A core material 39 is provided on each Me. Each of these core members 39 is formed by cutting a transparent sheet material into a strip having a predetermined length, and there is a core member 39 between both end portions 39a of each core member 39 and the pushing member 37. The flexible deformation part 41 which is not formed is formed.

  As shown in FIGS. 3 to 6, the front cross beam 21 has a U-shape when viewed from the front with a substantially flat flat portion 21a in the middle, and the inner side surfaces of the left and right seat frames 15 at the left and right end portions 21b. 15a is provided with a pair of mounting walls 45 in direct close contact with each other. Each of the mounting walls 45 is fixed to the corresponding seat frame 15 using a plurality of bolts 47 serving as fixing tools. Specifically, the mounting wall 45 is fixed to the seat frame 15 by fastening two bolts 47 penetrating the mounting wall 45 to nuts 49 embedded in the seat frame 15. In addition, the both end parts 21b of the front cross beam 21 are each provided with the exterior wall 51 which clamps the seat frame 15 in cooperation with each said attachment wall 45, respectively. The mounting wall 45 has a shape extending along the seat frame 15, and the fitting portion 53 constituted by the mounting wall 45 and the exterior wall 51 is long before and after extending along the seat frame 15. It has a form. Accordingly, the mounting wall 45 is set so that the longitudinal dimension L2 in the direction along the seat frame 15 is larger than the thickness dimension T2.

  As shown in FIGS. 2 to 7 and 10, the upper horizontal beam 29 is curved so that a central portion 29 a protrudes rearward, and the inner side surfaces of the left and right back frames 23 are formed on the left and right end portions 29 b. 23d is provided with a pair of mounting walls 55 that are in direct close contact with each other. Each of the mounting walls 55 is fixed to the corresponding back frame 23 by using a plurality of bolts 57 as fixing devices. Specifically, the mounting wall 55 is fixed to the back frame 23 by fastening two bolts 57 penetrating the mounting wall 55 to a nut 59 embedded in the back frame 23. Note that both end portions 29b of the upper horizontal beam 29 are respectively provided with exterior walls 61 that sandwich the back frame 23 in cooperation with the mounting walls 55. The mounting wall 55 has a shape extending along the back frame 23, and the fitting portion 63 formed by the mounting wall 55 and the exterior wall 61 is long vertically extending along the back frame 23. It has a form. Thus, the mounting wall 55 is set such that the longitudinal dimension L3 in the direction along the back frame 23 is larger than the thickness dimension T3.

  As shown in FIGS. 2 to 7 and 9, the lower horizontal beam 33 joins the vicinity of the protruding portion 23 c of the back frame 23 protruding forward corresponding to the waist shape of the seated person, The left and right central portions 33a are curved so as to protrude rearward, and the left and right end portions 33b are provided with mounting walls 65 that make pairs that are in direct contact with the inner side surfaces 23d of the left and right back frames 23, respectively. Yes. Each of the mounting walls 65 is fixed to the corresponding back frame 23 by using a plurality of bolts 67 as fixing tools. Specifically, the mounting wall 65 is fixed to the back frame 23 by fastening two bolts 67 penetrating through the mounting wall 65 to a nut 69 embedded in the back frame 23. In addition, both end portions 33b of the lower horizontal beam 33 are respectively provided with exterior walls 71 that sandwich the back frame 23 in cooperation with the mounting walls 65. The mounting wall 65 has a shape extending along the back frame 23, and the fitting portion 73 formed by the mounting wall 65 and the exterior wall 71 is long vertically extending along the back frame 23. It has a form. Thus, the mounting wall 65 is set such that the longitudinal dimension L4 in the direction along the back frame 23 is larger than the thickness dimension T4.

  As shown in FIGS. 2 and 8, the chair according to the present embodiment is configured such that the seat 5 and the backrest 7 are integrally formed, and the seat 5 and the backrest 7 are configured as the support base 3. Cantilevered by a front cross beam 21 provided integrally therewith. A load placing surface 75 is provided between the support base 3 and the seat 5, and the load B 1 can be inserted and removed freely between the load placing surface 75 and the back surface 5 a of the seat 5. A luggage storage space 77 is formed.

  As shown in FIGS. 2 and 3, the load placement surface 75 includes an extending portion 79 in which a part of the outer edge 75 a is positioned outside the outer edge 3 e of the support base 3 in a plan view. The extending portion 79 is provided with dust removing means 81. That is, the luggage placement surface 75 in this embodiment is formed by the upper surface 21 c of the flat portion 21 a of the front cross beam 21 and the upper surface 83 a of the shelf board 83 that is detachably mounted on the support base 3. In other words, the shelf board 83 is provided so as to cover the upper surface 3 f of the support base 3, and a main part of the luggage placement surface 75, that is, a part of the luggage placement surface 75 is provided on the shelf board 83. The part is formed.

  As shown in FIGS. 2 to 8, the shelf board 83 includes a shelf body 85 that forms a part of a luggage placement surface 75 for removably supporting the luggage B1 on the upper surface 83a thereof, and the shelf 83 And an outer fitting wall body 87 provided on the lower surface of the plate body 85 and detachably fitted to the support base 3.

  The shelf main body 85 is placed on the upper surface 3f of the support base 3 and has a larger area than the support base 3 in a plan view, and is located outside the support base 3. A plurality of through holes 82 constituting the dust removing means 81 are provided at the site. The shelf main body 85 has an area larger than the A4 size in plan view, and includes curved portions 85b for preventing the load B1 from falling on the left and right side edges 85a. The shelf body 85 is disposed with its center portion substantially coincident with the rotation center O of the support base 3 that is the axis of the leg support 13, and the load placement surface 75 is disposed on the support base 3. It is formed at a position including the rotation center O.

  The outer fitting wall body 87 includes a holding portion 87 a that overlaps the outer peripheral surface 3 g of the support base 3 and a retaining portion 87 b that overlaps the bottom surface peripheral portion 3 h of the support base 3. The front surface is opened so that it can be detached from the rear. The outer fitting wall body 87 includes a rib 87 c for connecting the outer surface of the holding portion 87 a to the lower surface of the shelf board main body 85.

  Moreover, the chair concerning this embodiment has the armrest 89, as shown in FIG. As shown in FIGS. 3 to 5, 8, and 14, the armrest 89 is integrally formed with the exterior wall 71 of the lower horizontal beam 33, and the outer surface 33 c of the lower horizontal beam 33 and the armrest The outer surface 89a of 89 is smoothly integrated. The armrest 89 is provided so as to extend forward from the backrest 7, and an armrest main body 91 supported by the backrest 7, and an armrest pad 93 provided on the armrest main body 91, It comprises.

  The armrest main body 91 includes an elbow post 95 provided integrally with the lower horizontal beam 33 and an elbow frame 97 provided at the tip of the elbow post 95, and the elbow pad 93 on the elbow frame 97. Wearing. Specifically, the elbow frame 97 has a hard lower frame portion 97b having a pair of front and rear attachment portions 97a on the upper surface thereof, and a hard frame having both front and rear ends attached to the attachment portion 97a of the lower frame portion 97b. The lower frame portion 97b and the upper frame portion 97c form a rigid loop shape. In other words, the window portion 99 is formed by the lower frame portion 97b and the upper frame portion 97c. A soft elbow pad 93 is provided on the upper frame portion 97c. A hook 101 is provided on the opening edge 99a of the window 99 for hanging a bag or other luggage B2 in a state of not protruding from the outer edge 93a of the elbow pad 93 in plan view. That is, the hook 101 is formed integrally with the window 99 of the elbow frame 97. In other words, the hook 101 is formed by deforming the lower side 99b of the opening edge 99a of the window 99.

  Moreover, the chair concerning this embodiment is provided with the hanger 103 for hanging clothing, as shown in FIG. 2 thru | or FIG. The hanger 103 is integrally provided in a suspended posture on the lower side 29c of the upper horizontal beam 29, and the hanger body 105 for hanging clothes and the hanger main body 105 between the upper horizontal beam 29 are provided. The suspension member 109 is suspended and supported on the upper horizontal beam 29 in a state where the gap 107 is maintained.

  As described above, the swivel chair according to this embodiment includes the leg 1, the support base 3 that is pivotally supported by the leg 1, the seat 5 and the backrest that are supported by the support base 3. 7, the seat 5 is a pair of left and right seat frames 15, a flexible seat stretch 17 stretched between the seat frames 15, and the seat stretch 17 And a front cross beam 21 that is interposed between the front end portions 15b of the both seat frames 15 while applying a space 19 between the front end portions 15b of the both seat frames 15 and applies tension to the seating ground 17 in the interposed state. The backrest 7 forms a space 27 between the back frame 23 that forms a pair on the left and right sides, a flexible back fabric 25 stretched between the back frames 23, and the back fabric 25. While being interposed between the upper portions 23a of the two back frames 23, tension is applied to the back support 25 in the interposed state. A space 31 is formed between the upper horizontal beam 29 to be applied and the backrest 25 in a state of being separated from the backrest 25 while being interposed between the lower portions 23b of the back frames 23. And a lower horizontal beam 29 that applies tension to the backrest 25 in a state, and the tension M in a state where the front horizontal beam 21, the upper horizontal beam 29, and the lower horizontal beam 31 are interposed between the left and right frames F. Since the tension is applied to the stretch fabric M, the stretch fabric M can be held in a shape corresponding to the left and right frames F, and a high tension can be applied to the stretch fabric M.

  The front horizontal beam 21 is provided with a pair of mounting walls 45 that are in close contact with the inner side surface 15a of the left and right seat frames 15 at both left and right end portions 21b. The upper horizontal beam 29 and the lower horizontal beam 31 are Since both end portions 29b and 33b are provided with mounting walls 55 and 65 which make a pair in close contact with the inner surface 23d of the left and right back frames 23, the mounting walls 45, 55 and 65 respectively attach the left and right frames F to the outer surface Fa. The tension in the left-right direction can be applied to the stretch fabric M. Therefore, a high tension can be applied to the upholstery M. Further, since the front horizontal beam 21, the upper horizontal beam 29, and the lower horizontal beam 31 have exterior walls 51, 61, 71, respectively, the frame F is formed by the mounting walls 45, 55, 65 and the exterior walls 51, 61, 71. It can be clamped from the left-right direction, and the left-right shift of the frame F can be suppressed.

  Further, each of the mounting walls 45, 55, 65 has a shape extending along the frame F, and these mounting walls 45, 55, 65 are respectively corresponded by using two bolts 47, 57, 67. Since it is fixed to the seat frame 15 or the back frame 23, the mounting walls 45, 55, 65 can be firmly attached to the seat frame 15 and the back frame 23. Therefore, the lower horizontal beam 31 provided with the mounting walls 45, 55, 65 can be firmly attached to the seat frame 15, and the upper horizontal beam 29 and the lower horizontal beam 31 can be firmly attached to the back frame 23.

  Further, since the mounting walls 45, 55, 65 have the longitudinal dimensions L2, L3, L4 in the direction along the seat frame 15 or the back frame 23 larger than their thickness dimensions T2, T3, T4, The adhesion between the walls 45, 55, 65 and the seat frame 15 or the back frame 23 can be further enhanced.

  The back frame 23 has a protruding portion 23c protruding forward corresponding to the waist shape of the seated person in the vicinity of the lower end, and the left and right sides on the back side in the vicinity of the protruding portion 23c corresponding to the waist portion. The lower horizontal beam 33 is attached between the back frames 23 so as to push the back frames 23 left and right. For this reason, the back fabric 25 is stretched so as to have a protruding shape corresponding to the protruding portion 23c when tension is applied by the lower horizontal beam 33, and the tension of the stretched fabric M of the portion where the weight is particularly concentrated. Can be increased.

  Further, the upholstery M is provided with push-in members 37 at both left and right edges Mc, and the push-in members 37 are reversed to mounting grooves 35 provided continuously on the outer side face Fa of the frame F. Therefore, the tension material M is stretched by inserting the pushing member 37 provided in the tension material M into the attachment groove 35 provided in the frame F. The desired tension can be given to the. Further, since the pushing member 37 is inverted and inserted into the mounting groove 35 provided on the outer side face Fa of the frame F, the tension material M does not go around the outer side face Fa side of the frame F as in the prior art. Compared with the case where it attaches, the tension fabric M bends to the edge part of a seating surface, and it can be set as the thing which is comfortable.

  In particular, the push-in member 37 is continuously provided along the left and right edges Mc on the back surface Mb side of the stretch fabric M, and the mounting groove 35 is continuously provided on the outer surface Fa of the frame F. Therefore, when the pushing material 37 is pushed into the mounting groove 35, the continuous pushing material 37 is easily pushed into the fitting groove 35 due to the rigidity of the pushing material 37, and the work of attaching the tension fabric M to the frame F is easily performed. be able to.

  Furthermore, since the upholstery M has a mesh shape, the tension distribution of the upholstery M can be understood. That is, it is possible to visually identify which part of the tension fabric M has a large tension.

  The left and right armrests 89 are integrally formed with the lower horizontal beam 33 located on the back of the waist, and further vertically connected to the left and right back frames 23 so as to connect the left and right back frames 23 at the lower horizontal beam 33 portion. Since it is fixed with the longitudinal dimension L4 in the direction, the mounting strength is high, and it does not wobble even if a load is applied to the armrest 89 during use. In addition, regarding compatibility with chairs without armrests, it is easy to make different products because the lower cross beam 33 without armrests or with armrests is simply selected and installed as needed at the product assembly stage. is there.

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

  The chair according to the present embodiment has been described with respect to the chair in which the seat and the backrest are integrally formed. However, the present invention is not limited to this, and the seat frame and the back frame are discontinuous, and the seat and the backrest. And may be configured separately.

  In such a case, it is preferable to provide a rear horizontal beam interposed in the rear part between the left and right seat frames in addition to the front horizontal beam interposed in the front part between the left and right seat frames. If it is such, a desired tension | tensile_strength can be given to a tension ground also in the back of a seat.

  Further, the front transverse beam, the upper transverse beam, and the lower transverse beam are not limited to those directly attached to the frame, but each of the transverse beams 21, 29, and 33 can be indirectly attached to the frame F as shown in FIG. It may be. That is, a gap may be provided between the mounting walls 45, 55, and 65 of the horizontal beams 21, 29, and 33 and the frame F, and an interposed member such as the spacer S may be provided in the gap. If it is such, the tension | tensile_strength of the tension | tensile_strength M can be adjusted by changing the thickness of the spacer S to interpose variously.

  Further, as shown in FIGS. 16 and 17, a lumbar support member 111 that supports the waist is interposed between the lower horizontal beam 33 and the backrest 25, and the lumbar support member 111 is attached to the lower horizontal beam 33. May be. If it is such, since the cross section of the said lower horizontal beam 33 has comprised the substantially rectangular shape, the lumbar support member 111 as shown in FIG.16 and FIG.17 can be attached or detached so that rotation is impossible. The lumbar support member 111 is made, for example, by synthetic molding of synthetic resin, and includes an attachment portion 111a having a C-shaped cross section that opens at one end thereof. The lumbar support 111 is fixed to the lower horizontal beam 33 by fitting the mounting portion 111a to the lower horizontal beam 33 and then attaching a separate lid member (not shown) to the C-shaped opening with a screw or the like. It is preferable to do.

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

DESCRIPTION OF SYMBOLS 1 ... Leg 3 ... Support base 5 ... Seat 7 ... Backrest 15 ... Seat frame 15a ... Inner side surface (seat frame)
17 ... Zatari 19 ... Space (between front beam)
21 ... Front cross beam 21b ... End (front cross beam)
23 ... back frame 23a ... upper part (back frame)
23b ... Lower part (back frame)
23c ... Projection (back frame)
23d ... Inside surface (back frame)
25 ... Background 27 ... Space (between upper cross beam)
29 ... Upper horizontal beam 29b ... End (upper horizontal beam)
31 ... Space (between the lower horizontal beam)
33 ... Lower horizontal beam 33b ... End (lower horizontal beam)
35 ... Mounting groove 37 ... Pushing material 45 ... Mounting wall (front cross beam)
55 ... Mounting wall (upper horizontal beam)
65 ... Mounting wall (lower horizontal beam)
47, 57, 67 ... Fasteners (bolts)
T2, T3, T4 ... Thickness dimension (mounting wall)
L2, L3, L4 ... Longitudinal dimension (mounting wall)
Mc ... Edge (left and right of the tension)
Fa ... Outer side (frame)

Claims (10)

In a swivel chair comprising a leg, a support base that is pivotally supported by the leg, and a seat and a backrest supported by the support base,
The seat has a pair of left and right seat frames, a flexible seat stretched between the seat frames, and a space between the seat frames while forming a space between the seat frames. A front transverse beam that is interposed between the front end portions and applies tension to the seating ground in the interposed state;
The backrest forms a pair of left and right back frames, a flexible back tension stretched between the back frames, and a space between the back frames while forming a space between the back frames. An upper horizontal beam that is interposed between the upper portions of the frame and imparts tension to the backrest in the interposed state, and is interposed between the lower portions of the back frames in a state of being separated rearward from the backrest. A swivel chair comprising: a lower horizontal beam that applies tension to the backrest in a state.   The swivel chair according to claim 1, wherein the seat frame and the back frame are continuous, and the seat and the backrest are integrally formed.   The swivel chair according to claim 1, wherein the seat frame and the back frame are discontinuous, and the seat and the backrest are configured separately.   The front horizontal beam is provided with a pair of mounting walls that are directly or indirectly in close contact with at least the inner side surfaces of the left and right seat frames at the left and right ends, and the upper horizontal beam and the lower horizontal beam are at the left and right ends. The swivel chair according to claim 1, 2 or 3, wherein each of the swivel chairs is provided with a pair of mounting walls in close contact with at least inner surfaces of the left and right back frames.   The mounting wall has a shape extending along the seat frame or the back frame, and each of the mounting walls is fixed to a corresponding seat frame or back frame using a plurality of fasteners. 4. The swivel chair according to 4.   The swivel chair according to claim 4 or 5, wherein the mounting wall has a longitudinal dimension set in a direction along the seat frame or the back frame larger than a thickness dimension thereof.   The back frame has a protrusion that protrudes forward corresponding to the waist shape of the seated person in the vicinity of the lower end, and the back tension is applied to the protrusion by applying tension by a lower horizontal beam. The swivel chair according to claim 1, 2, 3, 4, 5 or 6, which is stretched so as to form a corresponding protruding shape.   The swivel chair according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the seat and the back are cantilevered by the support base only through the lower horizontal beam.   The seat and the back fabric are provided with a pushing material at the edge, and the pushing material is inserted into a mounting groove continuously provided on the outer surface side of the seat frame and the back frame. The swivel chair according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein a seat stretch and a back stretch are stretched.   The swivel chair according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the seating fabric and the backing fabric are mesh-shaped.

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