JP2017079897A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair, even when including a lumbar support body, the position of which is vertically changeable, having excellent design flexibility for reducing the thickness dimension of side frame materials.SOLUTION: The chair includes a lumbar support laid across left/right side frame materials of a backrest. The lumbar support includes: a pair of left/right fitting members located inside the respective side frame materials and fitted to the side frame materials; and a lumbar support body laid across the left/right fitting members in such a manner as to change the vertical positions thereof. Even when the chair includes a lumbar support body, the position of which can be changed vertically, this configuration can provide the chair with excellent design flexibility for reducing the thickness dimension of the side frame materials.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a chair suitably used in an office or the like.

  Conventionally, various chairs including a lumbar support for supporting the waist portion of a seated person on the backrest are known (see, for example, Patent Document 1).

  By the way, in a chair in which the backrest has side frame members on the left and right, there is one in which a lumbar support is constructed between the left and right side frame members. In this type of chair, there is a chair in which a lumbar support main body that directly corresponds to the seated person's waist is configured to be movable up and down.

  However, in such a conventional chair, since the lumbar support main body that can move up and down is provided between the side frame members, the lateral dimension (width dimension) and the longitudinal dimension (thickness dimension) of these side frame members are likely to be large. There was one side that a suitable impression may be spoiled in appearance.

JP 2014-079519 A

  The present invention has been made paying attention to the above circumstances, and in order to reduce the width dimension or thickness dimension of the side frame material even if it has a lumbar support body whose position can be changed in the vertical direction. The object is to provide a chair with excellent design freedom.

  That is, the present invention has the following configuration.

  The invention according to claim 1 is a chair in which a lumbar support is arranged between left and right side frame members of the backrest, and the lumbar support is positioned inside each of the side frame members and is attached to these side frame members. The chair includes a pair of left and right mounting members and a lumbar support body that is spanned between the left and right mounting members so that the vertical position can be changed.

  According to a second aspect of the present invention, each side frame member has an outer frame portion and an inner frame portion positioned inside the outer frame portion and having a front portion positioned rearward of a front portion of the outer frame portion. The chair according to claim 1, wherein the attachment member is attached to the inner frame portion.

  The invention according to claim 3 is that the lumbar support body has a plate-like lumbar plate in which the thickness dimension of the middle part in the vertical direction is set larger than the thickness dimension of the upper part and the lower part, The chair according to claim 1, further comprising an attachment member engaging portion that protrudes outward from both sides of the intermediate portion and engages with the attachment member.

  According to a fourth aspect of the present invention, each side frame member includes an outer frame portion and an inner frame portion positioned inside the outer frame portion and having a front portion positioned rearward of the front portion of the outer frame portion. The attachment member is attached to the inner frame portion, and the front surface of the attachment member is set to be substantially flush with the front surface of the outer frame portion. It is a chair of Claim 1, 2, or 3.

  According to a fifth aspect of the present invention, the backrest comprises a backrest surface formed of a mesh-like tension member, and the mounting member is attached to the side frame member in the front-rear direction. The chair according to claim 1, 2, 3, or 4, further comprising a bolt insertion hole that extends to the front of the mounting member.

  The invention according to claim 6 is characterized in that the backrest connects the left and right side frame members, an upper frame member that connects the upper parts of the side frame members, and a lower frame member that connects the lower parts of the side frame members. And a back frame that is an integrally formed product having an intermediate connection frame material that connects the left and right side frame materials in a state where cavities are formed between the lower frame material and the upper frame material, respectively. The back frame is provided with an upper frame-shaped portion in which the one cavity is formed by the left and right side frame members, the upper frame member, and the intermediate connecting frame member, and the lumbar support is The chair according to claim 1, 2, 3, 4 or 5, which is arranged behind a mesh-like tension member stretched on an upper frame-like portion.

  The invention according to claim 7 is configured such that the lumbar support main body can be moderately engaged with the mounting member in the vertical direction. It is a chair.

  As described above, according to the present invention, even if it has a lumbar support main body whose position can be changed in the vertical direction, it is excellent in design flexibility for reducing the width dimension or thickness dimension of the side frame material. A chair can be provided.

The perspective view which shows one Embodiment of this invention. The front view in the embodiment. The right view in the same embodiment. The rear view in the embodiment. The top view in the embodiment. The perspective view in the embodiment. XX sectional drawing in FIG. The YY sectional view taken on the line in FIG. ZZ sectional drawing in FIG. The front view which shows the back frame of the embodiment. The rear view which shows the back frame of the embodiment. FIG. 11 is a cross-sectional view taken along line U-U in FIG. 10. FIG. 11 is a sectional view taken along line VV in FIG. 10. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment. The exploded perspective view in the embodiment.

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

  In this embodiment, the present invention is applied to an office swivel chair A suitably used in an office or the like.

  This chair A is a chair body B to which an optional hanger 9 is attached. Details will be described below.

<Chair body B>
The chair body B is provided with a support base 2 on the leg 1 so as to be able to turn. I am letting.

<Leg 1>
The leg 1 is provided with a plurality of leg blades 11 having a caster 111 at the tip and arranged radially, and leg struts 12 erected on the base end portion of the leg blades 11. The leg column 12 includes a gas spring (not shown) that can be expanded and contracted in the vertical direction and a cover 12a that conceals the gas spring, and supports the support base 2 so that the vertical position can be changed. .

<Support base 2>
The support base 2 includes a bottom wall 21 attached to the leg column 12, left and right side walls 22 rigidly connected to the bottom wall 21, a rear wall 23 connecting the rear end portions of the side walls 22, A top wall (not shown) for connecting the upper end portions of the side walls 22 is provided. A long hole 221 that can hold the front shaft j1 for supporting the front portion of the seat 3 so as to be movable back and forth is formed at the front end portion of the side wall 22. Further, the back support 4 is rotatably supported at the intermediate portion in the front-rear direction of the side walls 22 via a support shaft j2.

<Seat 3>
The seat 3 includes a seat receiver 31 and a seat body 32 provided on the seat receiver 31 so that the front-rear position can be changed. Both ends of the front shaft j1 are provided on the lower surface of the seat receiver 31. A front bearing portion 311 for holding and a rear bearing portion 312 for holding both end portions of a rear shaft j3 described later are provided.

<Back support 4>
The back support 4 includes left and right arms 41 whose middle portion is pivotally supported by the support base 2 via a support shaft j2, and a coupling member 42 that rigidly connects the rear portions of the left and right arms 41. It is. The coupling member 42 includes a rear plate 421 erected at the rear ends of the left and right arms 41, an intermediate plate 422 erected near the center in the front-rear direction of the left and right arms 41, and the intermediate plate 422 and the rear plate 421, and a channel member 423 disposed between the inner side surfaces of the arms 41. The rear plate 421, the channel member 423, and the intermediate plate 422 are integrally formed of a sheet metal material. It is configured.

  The rear plate 421 is a single one, and is provided with a plurality of bolt insertion holes h1 for inserting a plurality of bolts v1, and a nut portion n1 is provided on the lower surface side of each bolt insertion hole h1. Yes. That is, a backrest attaching portion t for attaching the backrest 5 is configured mainly by the rear plate 421 and the nut portion n1.

  A rearward tilt locking mechanism 6 for locking the backrest 5 at a desired rearward tilt position is provided between the channel member 423 and the rear wall 23 of the support base 2. The rearward tilt lock mechanism 6 includes a plurality of lock holes 231 provided in the rear wall 23 at intervals in the vertical direction, and a protrusion that is disposed in the channel member 423 and engages with any of the lock holes 231. A lock plate (not shown) capable of projecting and retracting between the position and a disengagement position for decoupling from the lock hole 423 and an operation lever 61 for projecting and retracting the lock plate are provided.

  The rear shaft j3 is penetrated in a portion corresponding to the channel member 423 in the left and right arms 41, and the seats are formed on both ends of the rear shaft j3 protruding outward from the arm 41. The rear bearing portion 312 of the receiving 31 is engaged. A receiving shaft 43 is installed between the front end portions of the left and right arms 41, and the backrest 5 is rotated forward between the receiving shaft 43 and the front end portion of the support base 2 via the back support 4. A reaction force mechanism 7 for energizing is provided. Here, reference numeral 71 denotes a coil spring constituting the reaction force mechanism 7, and reference numeral 72 denotes a preload adjusting lever for adjusting the preload of the coil spring 71.

<Backrest 5>
The backrest 5 includes a back frame 51 attached to the backrest attachment portion t, a tension member 52 stretched on the back frame 51, and a back side of the tension member 52 so as to be positioned on the back frame 51. And a lumbar support 53 attached thereto. The backrest 5 is configured such that a backrest surface for receiving the back of the seated person from behind is formed by a mesh-like tension member 52.

  The back frame 51 has a left and right side frame member W1 having a tension member mounting groove m1 opened outward and a tension member mounting groove m2 opened upward and connects the upper portions of the left and right side frame materials W1. The upper frame member W2, the lower frame member W3 connecting the lower portions of the side frame member W1, the tension member mounting groove m3 that opens downward, and the upper frame member W1, and the lower frame member. It has an intermediate connecting frame member W4 for connecting the left and right side frame members W1 with cavities s1 and s2 formed between them, respectively, and these side frame member W1, upper frame member W2, The frame material W3 and the intermediate connection frame material W4 are integrally formed of synthetic resin.

  The back frame 51 includes an upper frame-shaped portion f1 in which an upper cavity s1 is formed inside by left and right side frame members W1, an upper frame member W2, and an intermediate connecting frame member W4, and left and right side frame members W1 and a lower frame. A lower frame-like portion f2 in which a lower cavity s2 is formed inside by a material W3 and an intermediate connecting frame material W4 is provided.

  The lower portions of the left and right side frame members W1, that is, the lower portions W1d of the left and right side frame members W1 constituting the lower frame-shaped portion f2, have a shape that approaches each other in the front view.

  The upper part W1u of the left and right side frame members W1 constituting the upper frame-like part f1 has a dogleg shape that protrudes forward in a side view. A portion of the upper portion W1u that protrudes most forward is set at a position corresponding to the waist portion of the seated person. Further, the lower portions W1d of the left and right side frame members W1 constituting the lower frame-shaped portion f2 have a dogleg shape protruding rearward in a side view.

  On the outer side surfaces of the left and right side frame members W1, a tension member mounting groove m1 is formed which continues from the upper end of the side frame member W1 to a height position substantially corresponding to the lower edge of the intermediate connection frame member W4. And the step part z extended inward from the lower end part vicinity of the said tension member attachment groove | channel m1 is formed in the front surface of the left and right side frame material W1. The step portion z is formed on the front surface portion at a height position substantially corresponding to the lower edge of the intermediate connection frame member W4 in the side frame member W1, and the lower portion side of the step that protrudes ahead of the upper side. The step dimension of the stepped portion z substantially corresponds to the thickness dimension of the tension member 52.

  The thickness dimension in the front-rear direction of the upper portion W1u in the left and right side frame members W1 constituting the upper frame portion f1 is the lower portion W1d in the left and right side frame members W1 constituting the lower frame portion f2. Is set smaller than the thickness dimension in the front-rear direction.

  The left and right side frame members W1 include an outer frame portion w11 and an inner frame portion w12 that is located inside the outer frame portion w11 and has a front portion positioned rearward of the front portion of the outer frame portion w11. Yes. In the outer frame portion w11, the tension member mounting groove m1 and the stepped portion z are formed. A nut portion n2 for attaching a mounting member H of a lumbar support 53, which will be described later, and a positioning concave portion k1 are provided in the middle portion in the vertical direction of the inner frame portion w12. In the lower part of the inner frame portion w12, a plurality of recessed spaces k2 are provided side by side in the vertical direction via flat ribs r1, r2, r3, r4.

  More specifically, the inner frame portion w12 of the side frame member W1 includes a back wall w121 extending inward from the rear edge of the outer frame portion w11, and an inner wall w122 extending forward from the inner surface of the back wall w121. And. The nut portion n2 is provided between the outer frame portion w11 and the inner wall w122 of the inner frame portion w12 so as to be paired up and down, and the recessed portion k1 is formed between the nut portion n2 and the outer frame. It is formed between the portion w11 and the inner wall w122.

  In the lower part W1d of the left and right side frame members W1, the left and right width dimensions and the front and rear width dimensions are set larger than those of the upper part W1u. Between the outer frame portion w11 and the inner wall w122 in the lower portion W1d, plate-like ribs r1, r2, r3, r4 are provided at intervals in the vertical direction, and these ribs r1, r2, r3, A plurality of recessed spaces k2 opened to the front side are formed by r4, the outer frame portion w11, the back wall w121, and the inner wall w122.

  The upper rib r4 is formed so as to be continuous with the flange w42 of the intermediate connecting frame member W4. The rib r3 arranged below is provided at a height position corresponding to the position of the lower edge of the intermediate connecting frame member W4, and the front end is rearward compared to the other ribs r1, r2, r4. It has a form. That is, the front end of the rib r3 is formed so as to be continuous with the front surface of the intermediate connecting frame body w41. The outer end of the rib r3 is continuous with the stepped portion z in a front view.

  The upper frame member W2 includes an outer frame portion w21 and an inner frame portion w22 that is located inside the outer frame portion w21 and has a front portion positioned behind the front portion of the outer frame portion w21. In addition, a tension member mounting groove m2 opened upward is continuously formed on the outer surface of the outer frame member w21. A groove mz for attaching the hanger 9 is provided on the rear side of the tension member attaching groove m2. The groove mz is formed in a crescent shape that protrudes rearward in plan view, and has a shape in which the front-rear dimension of the bottom groove part mz1 in the groove mz is shorter than the front-rear opening dimension of the opening end part mz2 in the groove mz. There is no. A groove engaging portion 931 provided on the front end side of the first clamp member 93 is engaged with the groove mz. The inner portion w22 of the upper frame member W2 is provided with a guide protrusion w221 that forms a pair on the front side on the left and right. Since the second clamp member 94 of the hanger 9 to be described later can be engaged with the predetermined inner frame portion w22 so as to be along the protrusions w221, the hanger 9 is attached to the chair body B at a suitable position. Be able to.

  The lower frame member W3 is a flat plate-like lower frame member main body w31 that is superimposed on the backrest mounting portion t of the back support 4, and extends downward from both side edges of the lower frame member main body w31. Left and right side walls w32 disposed on the outer surface side of the arm 41 and a rear wall w33 extending downward from the rear edge of the lower frame body w31 and disposed on the rear edge side of the back support 4. The lower frame material main body w31, both side walls w32, and the rear wall w33 are each integrally connected to the side frame material W1. Bolt insertion holes h2 corresponding to the nut portions n1 of the back support 4 are formed in the lower frame body W31, and the bolts v1 inserted through these bolt insertion holes h2 are nut portions n1 of the back support 4. The back frame 51 is attached to the back support 4 by being screwed to each other.

  A cover 54 for concealing the head of the bolt v1 is mounted on the lower frame member W3. A front elastic claw 541 and a rear elastic claw 542 project downward from the lower surface of the cover 54. The front elastic claw 541 is engaged with the front edge of the lower frame material body w31, and the rear elastic claw 542 is engaged. Is engaged with an engagement hole an provided in the lower frame material main body w31, so that the cover 54 is fixed on the lower frame material main body w31. The cover 54 has a shape that covers the lower frame member W3 from the upper side and covers the left and right recessed spaces k2 formed at the lower end of the side frame member W1.

  The intermediate connecting frame member W4 is constructed between the portions of the left and right side frame members W1 that are inclined forward in a side view, and has a curved shape so as to protrude rearward in a plan view. The thickness dimension in the front-rear direction of the intermediate connection frame member W4 is set smaller than the thickness dimension in the front-rear direction at the same height position as the intermediate connection frame member W4 in the left and right side frame members W1.

  More specifically, the intermediate connection frame member W4 includes an intermediate connection frame member main body w41 provided between the left and right side frame members W1, and a flange w42 protruding from the front surface of the intermediate connection frame member main body w41. And a plurality of hanging parts w43 that hang downward from the lower surface of the flange part w42 along the front surface of the intermediate coupling frame body w41. The back surface of each hanging part w43 and the intermediate coupling frame material A tension member mounting groove m3 that opens downward is formed between the main body w41 and the front surface. These tension member mounting grooves m3 are formed intermittently with a gap left and right.

  The intermediate connection frame member main body w41 is set so that the front surface is substantially continuous with the front surface of the side frame member W1, and has a cross section including a back surface substantially parallel to the back surface of the side frame member W1 and a substantially horizontal bottom surface. It has a substantially triangular shape. The front surface of the intermediate connecting frame member main body w41 is tilted forward in the same manner as the front surface of the side frame member W1, and the tension member mounting groove m3 formed between the front surface and each hanging portion 43 is below Opening toward the cavity s1. That is, the tension member attachment groove m3 formed in the intermediate connection frame member W4 is opened downward in a state of being inclined obliquely rearward.

  In the vicinity of the portion where the left and right side frame members W1 and the intermediate connecting frame member W4 are connected to each other, there is provided a tension member mounting groove m4 that opens downward. In this embodiment, both left and right end portions of the intermediate connection frame member main body w41 are provided with both end hanging portions w44 that hang downward from the flange portion w42. These both end hanging portions w44 and the intermediate connection frame member main body w41 are provided. A tension member mounting groove m4 at the end is also formed between the front surface and the front surface. These end tension member mounting grooves m4 also open toward the lower cavity s1.

  The tension member 52 is formed by fastening a belt-like member G to the periphery of a mesh-like fabric J that can form a backrest surface by sewing or the like, and the belt-like member G is attached to the tension member mounting groove m1 of the back frame 51, By engaging with m2, m3, and m4, it is stretched on the front surface of the upper frame portion f1 in the back frame 51.

  The band-shaped member G includes a side frame material engaging portion g1 that engages with the tension member mounting groove m1 in the left and right side frame materials W1, and an upper frame material engaging portion that engages with the tension member mounting groove m2 of the upper frame material W2. g2 and an intermediate connecting frame member engaging groove g3 of the intermediate connecting frame member W4 and an intermediate connecting frame member engaging portion g3 that engages with the end member attaching groove m4. The part g1 and the upper frame material engaging part g2 are integrally provided continuously. The intermediate connecting frame member engaging part g3 is divided from the side frame member engaging part g1 in the vicinity of the end of the intermediate connecting member W4. For this reason, the area | region where the strip | belt-shaped member G does not exist only in the part distribute | arranged to the said step part z is provided in the periphery of the mesh-shaped cloth J.

  The lumbar support 53 is located between the left and right side frame members W1 of the backrest 5 and is positioned behind the tension member 52, and is positioned inside each of the side frame members W1 and attached to these side frame members W1. The pair of left and right mounting members H and a lumbar support main body I spanned between the left and right mounting members H so that the vertical position can be changed are provided.

  The lumbar support body I has a plate-shaped lumbar plate i1 in which the thickness dimension of the middle part in the vertical direction is set to be larger than the thickness dimension of the upper part and the lower part, and the lumbar support body I from the both sides of the middle part in the vertical direction And an attachment member engaging portion i2 that protrudes in the direction and engages with the attachment member H.

  The lumbar support 53 is obtained by holding the mounting member engaging portion i2 of the lumbar support main body I so as to be slidable in the vertical direction on the left and right mounting members H mounted on the left and right side frame members W1. A moderation mechanism S for stably holding the lumbar support main body I at a desired height position is provided between the main body I and the left and right mounting members H. In other words, the lumbar support main body I is configured to be able to moderately engage with the mounting member H in the vertical direction.

  The attachment members H are arranged in pairs on the left and right sides, and are set to dimensions in the front-rear direction that can be hidden by the side frame member W1 in a side view, as shown in FIG. In other words, the thickness dimension in the front-rear direction of the portion of the side frame member W1 where the mounting member H is fixed is the same as the thickness dimension in the front-rear direction of the mounting member H, or the thickness dimension in the front-rear direction of the mounting member H. Is also set larger. The attachment member H includes a front member p that holds the front side of the lumbar support main body I and a rear member q that holds the back side of the lumbar support main body I. The rear member q is attached to the side frame member W1 using a bolt v2. The attachment member H is attached to the inner frame portion w12, and the front surface of the attachment member H is set to be substantially flush with the front surface of the outer frame portion w11. The mounting member H includes a bolt insertion hole h3 extending in the front-rear direction for fixing to the side frame member W1, and a tension member 52 stretched on the front side of the bolt insertion hole h3. The bolt insertion hole h3 and the head of the bolt v2 inserted through the bolt insertion hole h3 are covered.

  The rear member q of the attachment member H has a bolt insertion hole h3 at the top and bottom and is covered with the front end of the inner wall w122 of the side frame member W1 so as to cover the recessed portion k1 of the side frame member W1. q1, a side wall q2 extending rearward from the inner edge of the front wall q1 and contacting the inner side surface of the inner wall w122 of the side frame member W1, and a rear wall q3 extending inward from the rear edge of the side wall q2 It is equipped with.

  Bolt insertion holes h3 corresponding to the nut portions n2 of the side frame member W1 are formed in the upper and lower ends of the front wall q1, and the bolt v2 inserted through the bolt insertion hole h3 is a nut of the side frame member W1. The rear member q is fixed to the side frame member W1 by being screwed to the portion n2. On the rear surface of the front wall q1, a projecting portion q11 extending in the vertical direction is provided in cooperation with the side wall q2 so as to sandwich the inner wall w122 of the side frame member W1.

  A claw hook portion q31 for attaching the front member p is provided at the upper end portion of the front surface of the rear wall q3, and a downward nut portion n3 is provided at the lower end portion. Further, a rib-like holding part q32 is provided in the vicinity of the inner edge of the front surface of the rear wall q3 so as to hold the attachment member engaging part i2 in the lumbar support main body I in cooperation with the front member p.

  The front member p of the attachment member H has a curved strip shape that is attached to the rear member q with its inner edge slidingly contacted with the front surface of the attachment member engaging portion i2 of the lumbar support main body I. On the rear surface of the front member p, an engaging claw p1 that engages with the claw hooking portion q31 of the rear member q and a protruding piece p2 having a bolt insertion hole h4 corresponding to the nut portion n3 are integrally provided. Yes.

  The lumbar plate i1 of the lumbar support main body I has a curved shape so that the central portion protrudes rearward, and can support the back of the seated person via the tension member 52.

  The attachment member engaging portion i2 of the lumbar support main body I is a plate-like member provided integrally at both ends of the lumbar plate i1. On the back surface of the attachment member engaging portion i2, a positioning projection i21 extending in the up and down direction contacting the inner surface of the holding portion q32 of the rear member q, and positioned outside the holding portion q32, the rear A bulging portion i22 that contacts the rear wall q3 of the member q is provided.

  The moderation mechanism S includes a moderation recess k3 continuously provided at a predetermined pitch in the vertical direction on the inner surface of the holding portion q32 of the rear wall q3, and a bulging portion in the attachment member engagement portion i2 of the lumbar support main body I. and a moderation convex portion i23 provided on the inner surface of i22. When the lumbar support main body I is moved up and down with respect to the mounting member H, the moderation convex portion i23 is one of the moderation concave portions k3. To get involved selectively.

<Synchloroocking mechanism R>
The synchro-rocking mechanism R is for changing the angle of the seat 3 at a constant ratio in response to the tilting of the backrest 5, and a seat receiver 31 via a front shaft j 1 at the front end of the support base 2. The rear portion of the seat 3 is pivotally supported by the arm 41 of the back support 4 via a rear shaft j3. The rear shaft j3 is inserted through a portion of the arm 41 located rearward of the support shaft j2. In this embodiment, the rear shaft j3 is positioned in the channel member 423. The arm 41 is provided.

<Hanger 9>
The hanger 9 is for hanging clothes or the like, and is attached to an upper frame material W2 that is a frame material constituting the chair body B.

  The hanger 9 includes a hanger body 91 extending in the left-right direction for hanging clothes, a pair of left and right hanger legs 92 extending forward and downward from the lower surface of the hanger body 91, and one surface side, that is, the upper surface side of the upper frame member W2. A first clamp member 93 that engages with the second clamp member 93 and a second clamp member that engages with the other surface side of the upper frame member W2 in order to sandwich the upper frame member W2 in cooperation with the first clamp member 93. A clamp member 94, a nut N inserted into the first clamp member 93, and a bolt v3 screwed into the nut N through a bolt insertion hole h6 provided in the second clamp member 94. It is equipped with.

  The hanger body 91 is curved so as to protrude rearward and has both ends as free ends.

  The hanger legs 92 are integrally provided at the intermediate position of the hanger body 91 by being divided into left and right, and the first clamp member 93 is integrally provided at the lower end of each hanger leg 92.

  The first clamp member 93 includes a nut insertion opening sn opened rearward for inserting the nut N therein. The first clamp member 93 includes a groove engaging portion 931 that engages with a groove z provided in the upper frame member W2 on the front side. A bolt insertion hole h5 communicating with the nut insertion hole sn is formed in the lower surface of the first clamp member 93.

  Specifically, the first clamp member 93 includes a top wall 93a in which the lower ends of the hanger legs 92 are integrated, a front wall 93b that extends obliquely forward and downward from the front edge of the top wall 93a, and the front wall 93b. A wall 93b and a block portion 93c integrally formed on the lower surface side of the top wall 93a are provided. The front wall 93b and the top wall 93a have the same left-right width dimension, and the groove engaging portion 931 is formed at the front end of the front wall 93b. The block portion 93c has a width dimension smaller than the front wall 93b and the top wall 93a, and the nut insertion port sn is formed in the block portion 93c. A bolt insertion hole h5 communicating with the nut insertion hole sn is formed on the lower surface of the block portion 93c.

  The second clamp member 94 includes a bottom wall 94a that abuts on the lower surface side of the upper frame member W2, and a side wall 94b that extends upward from both left and right edges of the bottom wall 94a and is externally fitted to the block portion 93c. It is provided. A bent inner frame portion engaging portion 941 that engages with the inner frame portion w22 of the upper frame member W2 is formed at the front end portion of the bottom wall 94a, and the block portion 93c is formed at the rear end portion of the bottom wall 94a. A concealing portion 942 is formed which is in contact with the back surface of the nut and conceals the nut insertion hole sn.

  The outer surfaces of both side walls 94b are formed to be substantially flush with the top wall 93a of the first clamp member 93 and both side surfaces of the front wall 93b, and the outer surface of the bottom wall 94a is The top wall 93a of one clamp member 93 and the back surface of the hanger leg 92 are flush with each other. Further, a pedestal portion 943 is formed on the inner surface of the bottom wall 94a so as to be fitted to the lower end portion of the block portion 93c. The pedestal portion 943 corresponds to the bolt insertion hole h5 of the first clamp member 93. A bolt insertion hole h6 is provided.

  The procedure for attaching the hanger 9 to the back frame 51 is as follows.

  First, after inserting a nut (T-nut) N from the rear into the nut insertion hole sn of the first clamp member 93, the groove engaging portion 931 of the first clamp member 93 is used as the groove z of the upper frame member W2. Engage from above. Then, the inner frame portion w22 of the upper frame member W2 is engaged with the inner frame portion engaging portion 941 of the second clamp member 94 from the lower side while using the protrusion w221 as a mark, so that the second clamp member 94 is One block member 93 of the clamp member 93 is externally fitted.

  In this state, the bolt v3 is inserted into the bolt insertion hole h6 of the second clamp member 94 and the bolt insertion hole h5 of the first clamp member 93 from below, and the bolt v3 is screwed to the nut N. . By the tightening force of the bolt v3, the upper frame member W2 is clamped from above and below by the first clamp member 93 and the second clamp member 94, and the hanger 9 is attached to the upper frame member W2 of the back frame 51. Fixed.

  As described above, the chair A according to the present embodiment has the lumbar support 53 disposed between the left and right side frame members W <b> 1 of the backrest 5. And the said lumbar support 53 is located inside each said side frame material W1, and the left-right attachment member H which makes a pair attached to these side frame materials W1, and a vertical position change between these left and right attachment members H A lumbar support main body I is provided so as to be spanned. For this reason, even if it has the lumbar support main body I which can change a position to an up-down direction, the chair A excellent in the freedom degree of the design for making the width dimension and thickness dimension of the side frame material W1 small is provided. Will be able to. That is, since the left and right attachment members H that support the lumbar support main body I so as to be movable in the vertical direction are positioned inside the side frame member W1, the attachment member H is side frame member W1 in a side view. The design can be made so as to be substantially within the thickness of the film. For this reason, in the chair A which concerns on this embodiment, it becomes easy to perform the design for reducing the front-back direction dimension, ie, thickness dimension, of the side frame material W1. In other words, the chair A provided with the lumbar support 53 in this embodiment can be easily designed to bring the thickness dimension of the backrest 5 close to the dimension of the side frame member W1. In addition, since it is not necessary to provide a mechanism for moving the lumbar support main body I in the side frame member W1 so as to move up and down, the side frame member W1 has excellent design flexibility for setting the left and right width dimensions to be short. It has become.

  Each of the side frame members W1 includes an outer frame portion w11 and an inner frame portion w12 that is positioned inside the outer frame portion w11 and has a front portion positioned behind the front portion of the outer frame portion w11. The attachment member H is attached to the inner frame portion w12. For this reason, since the attachment member H is attached to the inner frame portion w12, the attachment member H is likely to fit within the thickness dimension of each side frame member W1 in a side view. In addition, since the inner frame portion w12 and the outer frame portion w11 are different in the position of the front portion, each of the attachment members H is used by utilizing the boundary portion between the inner frame portion w12 and the outer frame portion w11. It becomes easy to position suitably to the side frame material W1.

  The lumbar support body I has a plate-shaped lumbar plate i1 in which the thickness dimension of the middle part in the vertical direction is set larger than the thickness dimension of the upper part and the lower part, and from both sides of the middle part in the vertical direction in the lumbar plate i1. An attachment member engaging portion i2 that protrudes outward and engages with the attachment member H is provided. For this reason, the lumbar plate i1 can suitably support the occupant's lower back portion, and the mounting member engaging portion i2 protrudes outward from both side portions of the middle portion in the vertical direction of the lumbar plate i1 to thereby attach the mounting member. The strength of the engaging portion i2 is easily ensured.

  The attachment member H is attached to the inner frame portion w12, and the front surface of the attachment member H is set to be substantially flush with the front surface of the outer portion w11. For this reason, not only can the appearance around the connecting portion between the side frame member W1 and the mounting member H be made suitable, but, for example, the mesh-like tension member 52 is preferably along a substantially flush surface. It can stretch or contract.

  The backrest 5 has a backrest surface formed by a mesh-like tension member 52, and the mounting member H is inserted through a bolt extending in the front-rear direction for fixing to the side frame material W1. A hole h3 is provided, and the tension member 52 is disposed on the front side of the mounting member H. For this reason, even if the attachment member H has the bolt insertion hole h3 opened to the front side, the bolt insertion hole h3 can be suitably covered by the tension member 52.

  The backrest 5 includes the left and right side frame members W1, the upper frame member W2 connecting the upper portions of the side frame members W1, the lower frame member W3 connecting the lower portions of the side frame members W1, A spine that is an integrally molded product having an intermediate connecting frame member W3 that connects the left and right side frame members W1 with cavities s1 and s2 formed between the lower frame member W3 and the upper frame member W1, respectively. A frame 51 is provided. The back frame 51 includes an upper frame portion f1 in which the one cavity s1 is formed by the left and right side frame members W1, the upper frame member W2, and the intermediate connection frame member W4. In such a configuration, the lumbar support 53 is disposed behind the mesh-like tension member 52 stretched on the upper frame-shaped portion f1. For this reason, since the tension member 52 is stretched on the upper frame-shaped portion f1 having excellent strength, and the lumbar support 53 is disposed thereafter, the size of the upper frame material W1 and the like in the front-rear direction is reduced. Therefore, it is easy to realize a good appearance that can give a slim impression.

  The lumbar support main body I is configured to be able to moderately engage with the mounting member H in the vertical direction. For this reason, the lumbar support main body I can be kept at an appropriate vertical position, for example, corresponding to the physique of the seated person.

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

  As long as the backrest has left and right side frame members on which the lumbar support is to be installed, it does not necessarily have to have a frame-like portion.

  The left and right attachment members are only required to be attached to the side frame member by being positioned inside the side frame member, and may not be arranged at a position hidden in the side frame member in a side view.

  The shape of the lumbar support main body is not limited to that shown in the present embodiment, and it goes without saying that an appropriate shape may be adopted.

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

A ... chair 5 ... backrest 53 ... lumbar support H ... mounting member I ... lumbar support body W1 ... (left and right) side frame material w11 ... outer frame part w12 ... inner frame part

Claims (7)

A chair with a lumbar support between the left and right side frame members of the backrest,
The lumbar support has a pair of left and right mounting members that are positioned inside the side frame members and are attached to the side frame members, and a lumbar that is spanned between the left and right mounting members so that the vertical position can be changed. A chair comprising a support body. Each of the side frame members includes an outer frame portion, and an inner frame portion that is located inside the outer frame portion and has a front portion positioned behind the front portion of the outer frame portion,
The chair according to claim 1, wherein the attachment member is attached to the inner frame portion. The lumbar support body has a plate-shaped lumbar plate in which the thickness dimension of the middle part in the vertical direction is set larger than the thickness dimension of the upper part and the lower part, and outward from both sides of the middle part in the vertical direction of the lumbar plate. The chair according to claim 1, further comprising an attachment member engaging portion that protrudes and engages with the attachment member. Each of the side frame members includes an outer frame portion, and an inner frame portion positioned inside the outer frame portion and having a front portion positioned rearward of the front portion of the outer frame portion,
The said attachment member is attached to the said inner frame part, The front surface of the said attachment member is set so that it may become substantially flush with the front surface of the said outer frame part. Chairs. The backrest comprises a backrest surface by a mesh-like tension member,
The said attachment member is equipped with the bolt insertion hole extended in the front-back direction for fixing to the said side frame material, The said tension member is distribute | arranged to the front side of the said attachment member. 4. The chair according to 4. The backrest includes the left and right side frame members, an upper frame member that connects the upper portions of the side frame members, a lower frame member that connects the lower portions of the side frame members, and the lower frame member and the upper frame member. Comprising a back frame that is an integrally molded product having an intermediate connection frame material that connects the left and right side frame materials in a state where a cavity is formed between each frame material,
The back frame includes an upper frame-shaped portion in which the one cavity is formed by the left and right side frame members, the upper frame member, and the intermediate connecting frame member,
The chair according to claim 1, 2, 3, 4, or 5, wherein the lumbar support is disposed behind a mesh-like tension member stretched on the upper frame-shaped portion. The chair according to claim 1, 2, 3, 4, 5 or 6, wherein the lumbar support main body is configured to be able to moderately engage with the mounting member in a vertical direction.

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