JP4255804B2 - Chair - Google Patents

Description

  The present invention relates to a chair.

  For example, a swivel chair often used for office work often has a structure in which a cushioning material is laminated on the upper surface of a synthetic resin seat inner shell. However, if the seat inner shell has a rigid structure, there is a problem in that the fit to the seated person and the cushioning property are not sufficient.

  Therefore, for example, in Patent Document 1, the applicant of the present application forms a large number of slits in the seat inner shell, supports left and right side portions of the seat inner shell with support members, and opens a space below the seat inner shell. The seat inner shell has been disclosed to be greatly elastically deformed so as to sink downward with the weight of the seated person.

The seat inner shell according to the prior application is used in a chair sold by the applicant of the present invention under the trade name of “Torino” or “Levino”, for example, and has been highly evaluated in the market for its high fit and cushioning. ing.
JP 2000-93250 A

  By the way, the weight of the user of the chair varies, and the manner of seating varies depending on the user, such as a person sitting quietly or a person sitting satisfactorily. Therefore, the magnitude of the load applied to the seat inner shell varies greatly depending on the user.

The invention of the present application takes into account the fact that the load applied to the seat inner shell varies greatly depending on the user, while following the idea of the prior application that secures fit and cushioning by elastically deforming the seat inner shell. those that were, no matter such as body weight difference of the seated person, it is an object of the present invention is to ensure a high fit, cushioning properties to the durability of the seat inner shell and the seat occupant.

The chair according to the present invention includes a seat in which an upper cushion layer is stretched on the upper surface of a synthetic resin seat inner shell, and an upwardly concave seat outer shell disposed below the seat. The inner shell is supported by a seat outer shell at least on the left and right side edges, and is formed with a large number of slit groups that open up and down. Therefore, the seat inner shell is elastically deformed to sink downward due to the load of the seated person. Is allowed.

A lower cushion layer, which is integrally connected to the upper cushion layer through the slit group and has a planar spread, is formed on the lower surface of the seat inner shell while holding the seat inner shell in the mold. Is formed by an insert molding method in which the lower cushion layer is supported by a seat outer shell, so that deformation of the seat inner shell is prevented and excessive deformation is prevented.

  According to the present invention, it is possible to prevent the seat inner shell from being elastically deformed (elongated) by the weight of the seated person, and to be deformed beyond the elastic limit to be plastically deformed or broken. For this reason, even if the person has a light weight, even if the seat inner shell is accurately deformed and the elastic deformation rate of the seat inner shell is set so that the fit and cushioning can be ensured, the person who has a heavy weight vigorously Even if it sits down, it does not plastically deform or break.

  For this reason, high durability can be secured for the seat inner shell while giving the user high fit and cushioning regardless of the weight of the seat.

  By the way, in Japanese Patent Application Laid-Open No. 2003-384617, a cushion portion is provided in a portion extending along the center line in the front-rear direction on the lower surface of the seat inner shell, and when the seat inner shell is elastically deformed to some extent, There is disclosed a technique in which a portion hits a horizontally long pipe constituting a seat support frame.

  However, in the configuration of this publication, since the rear part of the seat inner shell is only supported by the seat support frame in a point contact state, there is a risk of giving a jerky feeling when the seat inner shell hits the seat support frame. . More specifically, the seat inner shell is expected to bend upwardly by hitting the seat support frame in a point contact manner, and there is a concern that the seated person may feel a push-up.

In contrast, in the present invention, since the lower cushioning layer is supported by the seat outer shell has a surface expanse, never seat inner shell shape of greatly changes, Therefore, to seated person It does not give a sense of incongruity like a push up feeling. For this reason, the seat Ri comfort does not deteriorate.

Moreover, since the seat outer shell that supports the seat inner shell in a state in which it can be elastically deformed also serves as the deformation restricting means, the structure can be simplified accordingly.

Further in the present invention, the damper effect of the lower cushion layer (buffering action), since the elastic deformation stopping of the seat inner shell is gradually carried out, comfortable is even better. In this case, since the lower cushioning layer has a surface expanse, rather than push-up feeling when the elastic deformation stop of the seat inner shell, also, since the lower cushioning layer is formed simultaneously with the upper cushions layer, processing cost Can be suppressed.

Next, embodiments of the present invention will be described with reference to the drawings. First, based on FIGS. 1-12, the chair to which this invention is applied is demonstrated as a reference example.

(1) Reference examples (Figures 1 to 12 )
Among these, FIG. 1 is a side view of the chair. As shown in FIG. 1, the chair includes a leg 1 with casters, a seat 2, a backrest 3, and an armrest device 4. The leg 1 is provided with a leg support 5 that is freely extendable and rotatable, and a support base 6 is fixed to the upper end of the leg support 5.

The seat 2 is attached to the seat frame body 7 via the seat outer shell 7, and the front end portion of the seat frame body 7 can be tilted and retracted backward by the first shaft 9 at the front end portion of the support base 6. Installed on. In this example, the seat frame body 8 corresponds to the support member described in the back frame body 3.

  In addition, the front end portion of the back frame body 10 is connected to the rear base portion of the support base 6 so as to be able to tilt backward by the third shaft 11, and a back column 12 is provided at the rear portion of the back frame body 10, The backrest 3 is attached to the back column 12. A lumbar support 13 is disposed between the backrest 3 and the back column 12 so as to be movable up and down.

  Further, a portion of the back frame body 10 behind the third shaft 11 and the rear portion of the seat frame body 7 are connected by a second shaft 14 so as to be relatively rotatable. For this reason, when the backrest 3 tilts backward, the seat 2 also moves backward while tilting back together. This will be described in detail below with reference to the drawings of FIG.

(2). Outline of Supporting Mechanism for Seat and Backrest First, an outline of the supporting mechanism for the seat and the backrest will be described with reference to FIGS. 2 is an exploded perspective view of the main member, FIG. 3 is a longitudinal side view of the seat, FIG. 4 is a plan view taken along the line IV-IV in FIG. 3, and FIG. 5 is a plan view of the rear as viewed at the same height as FIG. It is.

  For example, as is apparent from FIG. 2, the support base 6 is formed in a box shape with an upward opening provided with a bottom plate and left and right side plates 6 a, and an inner bracket 15 is fixed to the rear portion of the support base 6 via the inner bracket 15. The upper end of the leg support 5 is fixed. A slit 16 for pivotally supporting the first shaft 9 is formed in the front part of the left and right side plates 6a of the support base 6 so as to open forward.

  The seat frame body 7 includes a pair of left and right metal plate vertical members (side members) 17 extending in the front-rear direction, a first shaft 9 made of a round pipe that is fixed to the front of the left and right vertical members 17, and a longitudinally long pipe. It consists of a second shaft 14 made of a round pipe with a longitudinal length fixed to the rear part of the left and right vertical members 17. Both shafts 11 and 14 penetrate the vertical member 17 and are fixed to the vertical member 17 by welding.

  The longitudinal member 17 of the seat frame body 8 is formed with a flange 17a extending outward in the left and right directions, and the seat outer shell 7 is attached to the flange 17a so as to be movable back and forth (details will be described later). The seat outer shell 7 is made of synthetic resin (for example, made of polypropylene).

As shown in FIG. 3, the seat 2 has a structure in which a cushion 19 is stretched on a seat inner shell 18 made of synthetic resin. Needless to say, the cushion 19 is covered with a skin material such as a cloth.

  The back frame body 10 includes a vertical member (side member) 21 made of a metal plate that extends substantially rearward from the rear lower portion of the support base 6, and a third shaft 11 that is fixed to the front end portions of the left and right vertical members 21. I have. The vertical member 21 is formed in a U-shape with an outward cross section, and the third shaft 11 penetrates the vertical member 21 and is fixed by welding. The left and right vertical members 21 extend in a rearwardly-inclined manner while increasing the interval between them, and are integrally connected via a rear portion 21a. The back column 12 rises from the rear part 21a.

  The inner bracket 15 is provided with a front wall 15a that is substantially perpendicular to the bottom surface of the support base 6, and a left and right kinetic rear spring receiver 22 and a front and rear kinetic rear spring receiver 23 are provided on the front side of the front wall 15a. A spring (coil spring) 26 that supports the backward movement of the first shaft 9 is supported from the rear by the back-and-forth moving rear spring receiver 23. The laterally movable rear spring receiver 22 is supported by the front wall 15 a of the inner bracket 15.

  The laterally movable rear spring receiver 22 is fitted inside the longitudinally movable rear spring receiver 23, and the pressure contact surfaces (cam surfaces) 24 of the rear spring receivers 22, 23 are the shafts 9, 11 in plan view. , 14 is inclined with respect to the inclined surface. A left and right longitudinal handle 25 is screwed into the left and right rear spring receiver 22, and the elastic force of the spring 26 can be adjusted by rotating the handle 25.

As partially shown in FIG. 5, a gas cylinder for adjusting the rearward tilt angle of the back frame body 10 and for rearward tilt locking is provided between the rear portion 21 a of the back frame body 10 and the rear portion of the support base 6. 27 that the have been placed.

(3). Attaching structure of each shaft The left and right front bushes 31 (see FIG. 4) are fitted to portions of the first shaft 9 inside the support base 6. Although not shown, the left and right front bushes 31 are made of synthetic resin and separated into two parts, upper and lower parts, and a long hole (long groove) that allows the first shaft 9 to slide back and forth on the mating surface of the upper and lower parts without backlash. Is forming.

  Further, the left and right front bushes 31 are fitted in the slit holes 16 of the support base 6. A front spring receiver 32 is disposed between the left and right front bushes 31 so as not to move left and right. The front spring receiver 32 is formed in a substantially U shape with a rearward opening in a side view so that the first shaft 9 is fitted from behind.

  The left and right front bushes 31 and the front spring receiver 32 have a U-shape facing forward when viewed from the side, and are fitted into the metal plate front metal fitting 33, and the front metal fitting 33 and the left and right front bushing 31 are screwed. 34 is fastened to the bottom plate of the support base 6. Although not described in detail, the first shaft 9 is engaged with the front spring receiver 32 or the left and right front bushes 31 so as not to move left and right.

  As shown in FIG. 3, a synthetic resin backward tilt restricting stopper 39 is provided on the upper surface of the rear portion of the inner bracket 15, and when the backrest is fully tilted backward, the third shaft 11 hits the backward tilt restricting stopper. The maximum rearward tilt angle is set to be regulated.

  The third shaft 11 is sandwiched from above and below by an upper center bush 40 and a lower center bush 41, and these upper and lower center bushes 40, 41 are covered from below with a hook-shaped center metal fitting 42 with a flap. The screw 42 'is fastened to the lower surface of the support base 6.

The rear bearing member of the present example includes a bridge member 43 arranged so as to span the left and right vertical members 21 of the back frame body 10 and a synthetic resin upper and lower rear bushing sandwiching the third shaft 11 at two positions on the left and right. 44, a rear metal fitting 45 that presses and fixes the rear bush 44 to the bridge member 43, and a screw 46 that fastens the rear metal fitting 45 to the bridge member 43. The bridge member 43 is fixed to the vertical member 21 by welding.

Note that the bridge member 43 is provided with a lateral overhang portion 43c, that are adapted to secure the armrest support the armrest device 4 to the protruding portion 43c.

(4) Seat outer shell and seat inner shell Next, the seat outer shell 7 and the seat inner shell 18 will be described with reference to FIGS. 6A is a plan view of the seat outer shell 7, FIG. 7B is a sectional view taken along the line BB of FIG. 7A, FIG. 7 is a plan view of the seat inner shell 18, and FIG. Separation vertical side view of the seat outer shell 7 and seat inner shell 18, (B) is a vertical side view of the seat inner shell 18 attached to the seat outer shell 7, and FIG. 8A is a sectional view taken along line IX-IX in FIG. 8, FIG. 10 is a sectional view taken along line XX in FIG. 9, and FIG. 11 is a sectional view taken along line XI-XI in FIG. FIG. 12 is a cross-sectional view of the mounting state of the seat outer shell 7 as viewed from the position XII-XII in FIG.

  The seat outer shell 7 and the seat inner shell 18 are made of synthetic resin (for example, made of polypropylene), and are each formed in a concave shape upward in a front view. 8, 11, and 12, the depth of the seat outer shell 7 is set to be deeper than the depth of the seat inner shell 18. There is a space between the seat outer shell 7 and the seat inner shell 18 in a state where it is applied to the outer peripheral portion of the outer shell 7. For this reason, the seat inner shell 18 is allowed to be elastically deformed and sunk by the seating.

  An upward frame portion 7 a having a width dimension that covers the seat frame body 8 is formed in a substantially front half portion of the seat outer shell 7 and along a longitudinal center line. This is for avoiding interference with the seat frame body 8, but of course it may be omitted.

On the lower surface of the seat outer shell 7, a group of guide claws 50 that embrace the flanges 17 a of the left and right vertical members 17 in the seat frame body 8 is formed. Therefore, the seat outer shell 7 and the seat 3 can be adjusted to its longitudinal position (adjusting means longitudinal position will be described later.).

  As a method of attaching the seat inner shell 18 to the seat outer shell 7, first, as shown in FIGS. A plurality of protrusions are provided at appropriate intervals along the seat inner shell 18. The seat inner shell 18 is formed with a recess 52 into which the locking claw 51 escapes and a stepped receiving portion 53 positioned on the front side of the recess 52. is doing.

  Therefore, when the seat inner shell 18 is shifted rearward with the recess 52 fitted in the locking claw 51, the receiving portion 53 of the seat inner shell 18 is engaged with the locking claw 51 of the seat outer shell 7, and the seat The inner shell 18 is held so as not to move upward from the seat outer shell 7.

  As means for holding the seat inner shell 18 immovably on the front side, a pair of left and right square engagement holes 54 are formed in the front portion of the top plate of the upward frame portion 7a in the seat outer shell 7, while the seat inner shell 18 is formed with a chevron-shaped stopper portion 55 facing downward in a side view that fits into the square engagement hole 54. The stopper portion 55 is surrounded by a rear-opening U-shaped slit 56 in a plan view, and thus the stopper portion 54 can be bent and deformed in the vertical direction.

  A front claw 57 that engages with the front end edge of the upward frame portion 7a of the seat outer shell 7 from below and a foot 58 that abuts against the upper surface of the seat outer shell 7 are integrated with the front portion of the seat inner shell 18. Provided.

  After the receiving portion 53 of the seat inner shell 18 is engaged with the locking claw 51 of the seat outer shell 7, when the front portion of the seat inner shell 18 is pushed downward, the stopper portion 55 is deformed against elasticity. The front claw 57 of the seat inner shell 18 engages with the upward frame portion 7a of the seat outer shell 7 from below, and the seat inner shell 18 is detached from the seat outer shell 7. Mounted impossible.

  When removing the seat inner shell 18, the front claw 57 is pulled forward with the fingertip to release the engagement with the upward frame portion 7 a, and then the fingertip is applied to the front portion of the seat inner shell 18 to raise it upward. The stopper portion 55 may be detached from the rectangular engagement hole 54, and then the seat inner shell 18 may be pulled forward.

  The seat inner shell 18 is formed with a number of slit groups so as to be elastically deformed in a state of being fitted to a human buttocks. The form of the deformation promoting slit 59 is the same as that described in the above-mentioned Patent Document 1, and includes a group of center slits 59 extending in the front-rear direction, a group of intermediate slits 60 positioned on the left and right outer sides thereof, and a left and right outer side thereof. It comprises a group of arranged side slits 61. The center slit 59 and the side slit 61 extend in the front-rear direction, and the group of intermediate slits 60 extends in an inclined manner.

  Then, the slits 59 to 61 are formed intensively at the portion where the seated person's buttocks abut, so that the portion where the body pressure acts strongly sinks and deforms more greatly. Although there is only a slight gap between the upper frame portion 7a of the seat outer shell 7 and the seat inner shell 18, the front portion of the seat inner shell 18 is hardly deformed, so that it slightly differs from the upper frame portion 7a of the seat outer shell 7. However, even if there is no gap (or hits the upward frame portion 7a), there is no problem.

  As shown in FIG. 6, a pocket portion 63 for storing a piece of paper 62 such as an instruction manual or warranty is formed on the inclined portion of the seat outer shell 7. The pocket portion 63 is composed of a two-sided lower piece (mounting piece) 63a in a plan view and a one-sided upper piece (pressing piece) 63b in a plan view, and both pieces 63a and 63b are The seat inner shell 7 is formed by using a die cut-out in manufacturing the injection molding method, and therefore does not overlap in plan view. At the base of the upper piece 63b, there is a hole 64 for inserting a finger to push the paper piece 62 outward.

  As described above, the seat inner shell 18 sinks and deforms most greatly at the portion where the seated person's buttocks hit, and this deformation provides cushioning and fit.

The seat 2 (outer shell 7) can be adjusted in the front-rear position, but the description is omitted.

(5). Embodiment (Fig. 13)
FIG. 16 shows an embodiment of the present invention in principle. That is, in addition to providing a top cushion layer 19 'on the upper surface of the seat inner shell 18, which was provided with a lower cushion layer 74 on the lower surface of the seat inner shell 18, a seat inner shell 18 in a state before the sitting seat lower cushion layer 74 between the outer shell 7 that are filled.

Thus providing the lower cushion layer 74, since the deformation stopping of the seat inner shell 18 is gradually carried out, that has excellent cushioning properties.

(6). Others The present invention can be embodied in various ways other than the above embodiment. For example, the present gun invention is also applicable to other chairs than swivel chair (e.g. folding chair).

Also, since the seat inner shell to deform sinking most large portion buttocks of the seated person hits, the lower cushion layer as the deformation restricting means is sufficient to support a portion buttocks hits in certain area.

It is a side view of the chair which concerns on a reference example . It is a separation perspective view of a main member. It is a vertical side view of a seat part. FIG. 4 is a plan view taken along line IV-IV in FIG. 3. FIG. 5 is a plan view of a rear portion viewed at the same height as FIG. 4. (A) is a top view of seat outer shell 7, (B) is a BB view sectional view of (A). 3 is a plan view of a seat inner shell 18. FIG. (A) is a vertical sectional side view of a seat outer shell and a seat inner shell, and (B) is a vertical side view after assembly. It is sectional drawing of the seat part seen in the IX-IX view location of FIG. 8 (A). FIG. 10 is a sectional view taken along line XX in FIG. 9. It is sectional drawing of the seat part in the XI-XI viewing location of FIG. It is sectional drawing of the seat part in the XII-XII location of FIG. It is sectional drawing of the seat which concerns on embodiment .

Explanation of symbols

1 leg 2 seat 3 backrest 6 support base 7 seat outer shell 8 seat frame 18 seat inner shell 19 ′ upper cushion layer
59, 60, 61 slit group
74 Lower cushion layer

Claims (1)

It has a seat with an upper cushion layer stretched on the upper surface of a seat inner shell made of synthetic resin, and an upward concave seat outer shell disposed below the seat, and the seat inner shell is at least on both the left and right sides The edge is supported by the seat outer shell, and a large number of slit groups that are opened up and down are formed.For this reason, the seat inner shell is allowed to elastically deform so as to sink downward with the load of the seated person.
A chair called
On the lower surface of the seat inner shell, a lower cushion layer, which is integrally connected to the upper cushion layer through the slit group and has a planar spread, is made of a resin material with the seat inner shell held in the mold. It is provided by an insert molding method injecting into the mold cavity, and by supporting the lower cushion layer with a seat outer shell, the seat inner shell is prevented from being deformed and excessively deformed,
Chair.

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