JP6353443B2 - Chair - Google Patents

Description

  The present invention relates to a chair, and is particularly suitable for a chair used in an office.

  The first of the elements that the chair should hold is the comfort of the user. In particular, comfort is an important factor because chairs used in offices keep people sitting for a long time. There are several factors that impede comfort, but typically there are a feeling of pressure due to a hard part that hits the body and a tight feeling that makes it difficult to move the body. Therefore, measures are taken to reduce the feeling of pressure and tightness.

  The problem of pressure is dealt with by placing cushions on the seat and back, or by configuring the seat and back with a mesh. Adopting a deformable structure for the seat plate and the backrest plate is also effective for improving the softness.

On the other hand, in order to prevent or reduce the feeling of cramping, it is only necessary to allow the body to move while sitting. Giving the chair a rocking function is an effective means for relieving the feeling of cramping. However, there is a limit to improving comfort with only a locking function. This is because a person can take various postures while sitting, but the backrest cannot follow changes in the posture of the person with a simple locking function.

  For example, it is normal for a seated person to turn the body and turn sideways, but if the backrest has a rigid structure, the person's twisting the body will reduce the contact area with the backrest. The user receives a feeling of pressure and comfort is reduced.

Therefore, ingenuity has been made to improve the followability of the backrest to the movement of the body. As an example, in Patent Documents 1 to 4, the backrest is supported by a back frame at three locations, the left and right middle portions of the lower end portions of the left and right top portions as a structure in which the backrest can be deformed by the body pressure of the seated person. It is described to do.

  If the backrest is freely deformed by the body pressure of the seated person, the stability of the body is impaired and the comfort is inferior. In other words, the backrest is required to have a function to firmly support the body. In particular, when a person sits on a chair and performs various desk work, if the body is bent forward, the internal body will be stressed and the burden on the body will increase, so even if the person is not locked, It can be said that it is highly necessary to support and keep the back straight.

Looking at Patent Documents 1 to 4 in terms of such a stable support function of the body, the backrests of Patent Documents 1 to 4 are three-point support of the left and right upper portions of the upper end and the left and right intermediate portions of the lower end. Therefore, it can be said that it does not deform excessively. However, since the lower part of the backrest is easily deformed, it cannot be said that the function of firmly supporting the body in the non-locking state and holding the back muscles extended is high. That is, in Patent Documents 1 to 4 , there is a possibility that the stable support function of the body in the non-locking state is not sufficient.

In addition, as a mode of use of the chair, it is often the case that the body is twisted to the right or left or the shoulder is shifted to the left or right in a locked state. In Patent Documents 1 to 4 , since the upper part of the backrest is difficult to deform, it cannot be said that the followability to the posture change of the body is high, and there is room for improvement in comfort in this aspect as well.

JP 2002-119366 A JP 2004-129966 A JP 2010-063831 A U.S. Pat. No. 7,249,802

  The present invention has been made against the background of such a situation, and intends to provide a chair that is improved in use value and improved. In addition, the present application includes many improved configurations, and may be provided.

The present application is composed of a group of inventions having a hierarchical and planar spread, and typical examples are specified in claims 1 to 8 .

The invention of claim 1 constitutes a superordinate concept. As a basic configuration, the invention includes a seat and a backrest, and a back frame having a rigid structure arranged with a space behind the backrest. The backrest includes a first support device disposed at a height near the upper end of the backrest, and a second support device disposed lower than the first support device and higher than the seat surface. It is attached to the back frame, and the first support device is attached to a portion of the backrest that is close to the left and right intermediate portion.

  In addition, the 1st support apparatus should just be attached to the upper end of the backrest, or its vicinity, and the backrest may protrude on the 1st support apparatus. That is, the mounting position of the first support device has a vertical width. The same applies to the second support device.

  In the present invention, the backrest is so-called three-point support of the left and right middle part of the upper end part and the two right and left parts below it. And, when the user is sitting without leaning on the backrest to perform desk work such as PC operation, the lumbar part etc. can be stably supported by the part supported by the left and right points of the backrest. it can. Therefore, the state where the back is stretched can be accurately maintained, and the user can take an appropriate working posture.

  On the other hand, since the first support device is close to the left and right middle portion of the backrest, the upper end portion (or upper portion) of the backrest protrudes to the left and right outer sides of the first support device and becomes a free end. That is, the left and right ends of the upper end (upper part) of the backrest are free ends that are not supported from the back. Therefore, by making the upper part of the backrest deformable with body pressure, it is possible to deform the backrest following the torsion of the body while leaning against the backrest, and in this state Can contribute to the improvement of comfort.

The invention of claim 2 (second invention) is a development example of claim 1, and in this invention, the first support device is deformed when the body pressure of the seated person is applied to the backrest, and the upper part of the backrest is rearward. The second support device has rigidity that does not substantially bend and deform even when the body pressure of the seated person is applied, or the body of the seated person. It has become difficult to deform elastically strength than before Symbol first support device which is elastically deformed by pressure.

In the second aspect , since the first support device has a spring property, it is permitted that the upper portion of the backrest moves so as to approach the back frame in a state where the person leans on the backrest. That is, the reaction force of the first support device acts on the upper portion of the backrest from behind, and this reaction force provides comfort to the user as a cushioning action. In addition, since the torsional deformation of the backrest is allowed by the deformation of the first support device, the following deformability when the person twists the body to the right or left while leaning on the backrest is also improved.

Moreover, since the second support device is hardly deformed by the body pressure of the seated person or is deformed, the degree of the second support device is smaller than that of the first support device. Although sometimes rather comfort rest takes the lower portion of the backrest in a state as the locking state is impaired stability of the body when excessive deformation is impaired, even Oite state takes rest at claim 2 backrest Since the body is stably supported at the lower part of the body, it is possible to prevent the body from moving excessively and improve comfort.

A third aspect of the present invention is a development example of the first or second aspect. In the present invention, the first support device has a vertically long posture in a side view, while the second support device has two left and right sides. These left and right second support devices are inclined so that the distance between the left and right second support devices increases toward the front in plan view.

In the present invention, the first support device and the second support device can adopt various modes. However, when claim 3 is used, the first support device and the second support device both have a simple portion extending between the back frame and the backrest. Since a simple plate-like form is sufficient, there is an advantage that the structure can be simplified. In addition, since the first support device 12 is long in the vertical direction, it can be easily deformed so as to bend backward due to the body pressure of the seated person, so that the followability to the body change and the cushioning property can be improved.

A fourth aspect of the present invention is a development example of any one of the first to third aspects. In the present invention, the back frame has a pair of left and right longitudinal members, and the left and right longitudinal members are The gap is narrowed as it goes upward, and the upper ends are connected together via a connecting portion, the first support device is attached to the connecting portion of the back frame, and the second support device is It is attached to the left and right vertical members .

Back frame, for example, to constitute a single member which is located on the left and right middle portion of the backrest, it is also possible to or adopting an inverted U-shaped form having a vertical portion of the left and right, form according to claim 4 Employing the (inverted V-shaped configuration) has an advantage of ensuring high strength while being simple.

Claim 5 (5th invention) is the development example in any one of Claims 1-4, In this invention, the said backrest has the resin-made main members attached to the said back frame. The main member has a loop-shaped frame body that constitutes the outer periphery and a body support portion located inside thereof, and the body support portion has a large number of slits or holes so that the body of the seated person The strength is easily elastically deformed by pressure.

Although various structures can be adopted for the backrest, since the main member is an integrally molded product in claim 5 , the labor of manufacturing can be saved as compared with a structure in which the frame body and the body support portion are formed as separate members. In addition, quality variations can be prevented.

In addition, although the body support part is provided integrally with the frame in claim 5 , as described above, the body support part is made of a flexible material such as a mesh material, and the flexible material is used as the frame. It is also possible to adopt a mounting configuration. In any case, it is preferable that the frame is deformed flexibly by the body pressure of the seated person.

A sixth aspect of the present invention is a development example of the sixth aspect. In the sixth aspect, a cushion is disposed on the front surface of the main member, and at least the cushion is covered with a skin material. In the structure of this Claim 6, the softness to the body can be ensured by the cushion.

Claim 7 (seventh invention) is a development example of claim 5 or 6 , and in this invention, the lower end of the main member is located near the seating surface, and a seated person is placed on the front or rear surface of the main member. A lumbar support member that supports the lumbar portion of the lumbar support member is disposed, and the main member is attached to the second support device at a position slightly above the lumbar support member. In addition, the specific matter of Claim 7 is applicable also to Claims 1-4 .

When the lumbar support member is provided as in the seventh aspect , the occupant's waist can be accurately supported, which can contribute to the occupant maintaining an appropriate posture. And since the 1st support apparatus is attached to the main member on the lumbar support member, it can prevent that the horizontal width of the main member becomes large too much. Moreover, since the attachment part of a 2nd support apparatus and the attachment part of a lumbar support member are near, the rigidity of the location of the attachment part of a lumbar support member among main members can also be raised, and a user's body stability is improved. You can contribute even more.

Claim 8 (8th invention) is the development example in any one of Claims 1-7 , In this invention, when the seated person's body pressure is applied, the said backrest inclines backward . In Russia Kkingu chair, thereby interlocking the seat to the backrest is widely performed. The present invention is naturally applicable to such a synchro-type chair.
Since the flexural deformation of the backrest appears prominently in the rocking state, the present invention is particularly effective under claim 8 .

The effect of each claim is as described above, and the present invention improves the comfort in the state of leaning on the chair. Furthermore, the strength of the chair can be ensured, and the manufacturing labor can be saved, and variations in quality can be prevented.

1A and 1B are views showing the overall appearance of a chair according to an embodiment, in which FIG. 1A is a perspective view seen from the front, and FIG. 1B is a perspective view seen from the rear. 2A and 2B are views showing the overall configuration of the chair, in which FIG. 2A is a partially separated perspective view, and FIG. 2B is a side view. 3A and 3B are separated views of the main part, in which FIG. 3A is a view showing a state in which the backrest is shifted in a normal posture, and FIG. 3B is a view in which the backrest is horizontally turned and separated. 4A and 4B are diagrams showing the relationship between the support device and the back frame, in which FIG. 4A is a perspective view of the first support device and the back frame separated, and FIG. 4B is a view of the first support device, the second support device, and the backrest. An exploded perspective view, (C) is an exploded perspective view of the second support device and the backrest. FIG. 5 is a separation view showing the relationship between the first support device and the backrest. FIG. 6 is a separation view showing the relationship between the second support device and the backrest. FIG. 7 is an explanatory view of a lumbar support member, (A) and (B) are separated perspective views, and (C) is a plan view of a backrest. FIG. 8 is a front view of the backrest. FIG. 9 is a perspective view of the backrest as seen from the front. FIG. 10 is a perspective view of the backrest as seen from behind. FIG. 11 is a separation diagram for explaining the function.

Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a swivel chair often used in an office or the like. In addition, in order to specify a direction in the following embodiments and claims, the words “front and rear” and “left and right” are used, and these directions are based on a person who normally sits on a chair. The front view direction is a direction facing the seated person.

(1). As chair Overview Figure 1, the chair is provided with a leg unit 1 and the seat 2 and the backrest 3 as a main element, the backrest 3 is attached to the back frame 4 disposed behind It has been. The leg device 1 includes a leg support 5 in a vertical posture and a center tube 6 that supports the leg column 5, and five branch arms extend in the radial direction from the center tube 6. A caster is attached to the tip of each branch arm.

  The leg support 5 is composed of an extendable gas cylinder having an inner cylinder and an outer cylinder. As shown in FIG. 2B, a base 7 is attached to the upper end of the leg support 5 and the back frame 4 is attached to the base 7. Are connected via a joint member 8 so as to be tiltable backward. The back frame 4 and the joint member 8 can be integrated. The inner cylinder and the outer cylinder constituting the leg column 5 are rotatable relative to each other. Therefore, the base 7 (and the seat 2 and the backrest 3) can be rotated horizontally.

  Although not shown, the base 7 incorporates a locking spring that elastically supports the rearward tilting of the back frame 4. The seat 2 is attached so that an intermediate member (not shown) provided on the base 7 can be moved backward while being tilted rearward around the front portion. The intermediate member and the joint member 8 are connected to each other so as to be capable of relative movement with a horizontally long shaft. For this reason, the seat 2 tilts backward while moving backward in conjunction with the backward tilt of the backrest 3.

  The backrest 3 has a main member manufactured by an injection molding method using a resin such as polypropylene as a material. When the backrest 3 has a cushion and a skin material, the backrest 3 and the main member must be distinguished. In this embodiment, the main member constitutes the entire backrest 3, and therefore the two are distinguished. The profit is thin. Therefore, in order to simplify the explanation, the wording of the backrest 3 is used without using the wording of the main member.

  The backrest 3 is composed of a frame body 9 that forms the outer periphery of the backrest 3 and a body support portion 10 that is positioned inside the frame body 9. As shown in FIG. 8, the frame 9 has a pair of side members 9 a that constitute both the left and right sides, a horizontally long upper member 9 b that constitutes the upper end portion, and a left and right horizontally elongated lower member 9 c that constitutes the lower end. It is formed in a close form.

  The lower end of the backrest 3 is located in the vicinity of the seat surface. A lumbar support member 11 that supports the waist of the seated person is disposed on the front surface of the backrest 3 at a height corresponding to the waist of the seated person. Since the height and preference of the seated person varies, the lumbar support member 11 can be adjusted in height.

The backrest 3 of the present embodiment has a shape constricted in a front view so that the attachment portion of the lumbar support member 11 is the narrowest. However, it is not necessary to be limited to this, and as the form of the backrest 3, the lateral width is substantially constant, the inverted trapezoidal shape having a wide upper end and a narrow lower end, or a narrow upper end and a wide lower end. Any form such as a trapezoidal shape can be adopted.

For example, as shown in FIG. 3, the back frame 4 has left and right vertically long members 4a that are inclined so as to approach each other as the distance therebetween increases. The upper ends of the left and right vertically long members 4a are integrally connected via a connecting portion 4b.

Accordingly, the left and right vertical members 4a form an inverted V shape. The lower end of the left and right longitudinal members 4a are connected together via the lower stay portion 4c. Further, the lower end of the left and right longitudinal members 4a, are provided integrally with forward arm portion 4d. The forward arm portion 4d and the lower stay portion 4c are connected to the joint member 8 shown in FIG. For example, as is clear from FIG. 4B, the longitudinal member 4a of the back frame 4 is formed in an L-shaped cross section having a back plate and a side plate. Therefore, lightweight, has a strong structure torsionally Chikaranami beauty from longitudinal and lateral directions.

  The back frame 4 of the present invention employs a resin molded product or an aluminum die-cast product, but can also be manufactured using a metal plate or metal pipe as a material. It is also possible to make a composite product of different materials. In addition, it is not necessarily an integral structure, and for example, the left and right vertically long members 4a may be separately manufactured and connected at the upper end, and may be configured by a plurality of parts. It is also possible to employ a shell structure product for the back frame 4.

Then, for example, as shown in Figure 3, the right and left intermediate portions of the upper member 9b of the backrest 3 is attached to the connecting portion 4b of the upper end of the back frame 4 via the first supporting device 12. The left and right side members 9 a are attached to the vertically long member 4 a of the back frame 4 via the second support device 13 at a portion above the attachment portion of the lumbar support member 11. This point will be described in detail below.

(2). Backrest Mounting Structure As shown in FIGS. 4A and 4B, the first support device 12 has two spring portions 12a arranged in a V shape when viewed from the front. A left and right horizontally long upper mounting portion 12b is integrally connected to the upper end of the spring portion 12a. And the lower attachment part 12c which protruded back is integrally connected to the lower end of the right-and-left spring board part 12a. The first support device 12 is manufactured by injection molding using a resin such as polypropylene, and the spring plate portion 12a has a vertically long posture, but is wide in a front view and narrow in a side view. Forms. For this reason, it can be easily bent and deformed by the force from the front.

The lower mounting portion 12c is formed in a horizontally long block shape (boss shape). In the connecting portion 4b of the back frame 4, a rear first concave portion 15 of a forward opening into which the lower mounting portion 12c is fitted is formed. The lower attachment portion 12c is fixed to the rear first recess 15 by a first bolt 16 inserted from below. 4 as (A), the attachment portion 12c of the first supporting device 12, the nut insertion hole 17 for setting a nut screwing the first bolt 16 is opened rearward.

As shown in FIG. 5, the upper member 9b of the backrest 3 has an inner / outer triple structure having an outer wall, an inner wall 18 and an intermediate wall 19 (drawing modification), and therefore, two long grooves opened rearward. 20 is formed. And the front side 1st recessed part 21 in which the upper attachment part 12b of the 1st support apparatus 12 fits is formed by notching the left-right intermediate part of the inner wall 19, for example. On the mounting portion 12b of the first supporting device 12 is fixed to the second bolt 2 2 Thus the upper member 9b which is inserted from below.

  The upper member 9b of the backrest 3 is formed with a nut holding portion 23 that opens rearward. On the other hand, on the upper mounting portion 12b of the first support device 12, a stopper piece 24 is provided so as to protrude upward from the nut holding portion 23 of the upper member 9b.

The second support device 13 is manufactured using a resin having high rigidity, such as nylon resin. As shown in FIGS. 5B and 5C, the second support device 13 includes a belt-like arm portion 13a that is gently bent in a waveform in plan view. A rear boss portion 13b is integrally provided at the rear end of the arm portion 13a, and a front boss portion 13c is integrally provided at the front end of the arm portion 13a. The arm portion 13a has rigidity that is not easily elastically deformed by the body pressure of the seated person (however, it may be elastically deformed a little).

The rear boss portion 13 b is fitted into a rear second concave portion 25 provided on the vertically long member 4 a of the back frame 4. A third bolt 26 is inserted into the rear second concave portion 25 from below. Behind the boss portion 13b of the second supporting device 13, the third bolt 26 is Nde write assembled nuts (not shown) to be screwed. The rear boss portion 13b is provided with a flange 13d that overlaps the opening edge of the rear second concave portion 25.

As clearly shown in FIG. 6, a front-side second recess 27 into which the front boss 13 c of the second support device 13 is fitted is formed in the side member 9 a of the backrest 3. Front second recess 27 has the shape of a circadian ne box-like appearance, the inner wall thereof 27a, bolt holes 28 which bolts (not shown) passes is empty. On the other hand, a nut mounting groove 29 is provided in the front boss portion 13 c of the second support device 13, and a bolt is screwed into a nut disposed in the nut mounting groove 29.

  In this case, the inner plate 25a of the front second concave portion 27 is formed with a step portion 30 for increasing the strength by thickening the bolt hole 28 portion. On the other hand, a notch 31 is formed in the front boss 13c of the second support device 13 so as to overlap the step 30 of the front second recess 27. The front boss portion 13 c of the second support device 13 is provided with a flange 13 e that overlaps the opening edge of the front second concave portion 27.

(3). Lumber Support Member Next, the lumbar support member 11 will be described mainly with reference to FIG. The lumbar support member 11 is a molded product made of a resin, and is made of a material having a certain degree of elasticity, such as polypropylene. The lumbar support member 11 has a laterally long shape that crosses the backrest 3 and is gently curved in a concave shape in a plan view. Further, the lumbar support member 11 is slightly curved in a forward projecting shape when viewed in a longitudinal side view.

  The left and right ends of the lumbar support member 11 are integrally formed with a slide boss body 34 that protrudes rearward in a prismatic shape. The slide boss body 34 is slidably fitted to a vertically long guide frame portion 35 provided on the side member 9 a of the backrest 3. As shown in FIG. 6, the inner periphery of the guide frame portion 35 is configured by a plate portion, and the above-described front second concave portion 27 is integrally connected to the upper end of the guide frame portion 35.

  As shown in FIG. 7, a block-like forward projecting portion 36 a provided on the knob 36 is fitted to the rear end of the slide boss body 34. The forward projecting portion 36a of the knob 36 is fixed to the slide boss body 34 by a bolt (not shown). The slide boss body 34 is provided with a nut insertion groove 37. The lumbar support member 11 can hold the height stepwise, and as a height adjusting means, as shown in FIG. Provided.

  Now, providing a lumbar support member on the backrest is widely performed, but generally it is often arranged on the back side of the cushion or the back side of the mesh material. However, if a cushion or mesh material is interposed between the lumbar support member and the body, it may feel unsatisfactory for a person who seeks a strong “feel”. In some cases, such as when the backrest is not provided with a cushion or mesh, the lumbar support member must be disposed in front of the back plate.

As an example, Japanese Patent Application Laid-Open No. 2008-237333 discloses that a backrest is composed of a frame portion and a back plate inside thereof, and a lumbar support member is placed in front of the back plate in a configuration in which a large number of slits are provided in the back plate. Disposition is disclosed. In this publication , a clip-type handle that is fitted to the frame portion from the outside is integrally provided at both left and right end portions of the lumbar support member, and the frame portion is elastically held by the handle.

  However, in the configuration in which the handle is fitted from the outside as in this publication, since the handle protrudes to the left and right outside of the frame portion, a person's clothes are caught on the handle, or an object hits the handle and the handle is damaged. Is concerned. Further, since the handle only holds the height by friction, the lumbar support member may slide down or rise up due to the body pressure of the seated person.

On the other hand, in the present embodiment, the slide bosses 34 provided at the left and right ends of the lumbar support member 11 penetrate the guide frame portion 35 of the frame body 9, so that the knob 36 protrudes from the left and right outer sides of the frame body 9. Can be arranged so that there is no. Thereby, it can prevent or remarkably prevent that clothes are caught on the knob 36 or an object hits it. Further, the guide frame 35, for providing the height hold means of the stopper holes 38 for height adjustment is simple, can be immovably retained shift the lumbar support member 11 to a desired height.

  The height adjusting means can employ various configurations. When the stopper hole 38 is provided in the guide frame portion 35 as in the embodiment, an elastic member that fits and detaches from the guide frame portion 35 may be provided in the block-like forward projecting portion of the knob 36. Since the guide frame portion 35 has a certain width in the front-rear direction, there is no reduction in strength due to the penetration of the slide boss body 34. The knob 36 can be simply plate-shaped and screwed to the slide boss body 34.

(4). Structure of the backrest Next, details of the structure of the body supporting portion 10 of the backrest 3 will be described with reference mainly to Figures 8-10. As shown in FIG. 8, in the present embodiment, the body support unit 10 includes a group of horizontally long side stays 40 connected to the left and right side members 9 a and a group of horizontally long center stays 41 positioned between the group of side stays 40. The groups of both stays 40, 41 are arranged in a vertically displaced state. A center area is constituted by a group of center stays 41, and a side area is constituted by a group of side stays 40.

The left and right ends of the center stay 41 adjacent to the left and right and the tip of the side stay 40 are integrally connected by a connecting piece (joint stay) 42. In this case, there is a little left-right distance between the tip of the side stay 40 and the end of the center stay 41, and thus the connecting piece (joint stay) 42 is in an inclined posture in front view. Furthermore, since the center stay 41 and the side stay 40 are arranged so as to be displaced in the vertical direction, the connecting pieces 42 adjacent to each other in the vertical direction are in opposite directions. And the base of the connection piece 42 adjacent to the upper and lower sides and the stays 40 and 41 are integrally connected. Accordingly, the group of the connecting pieces 42 has a zigzag shape in front view.

The backrest 3 is constricted in a front view as the lower part nearer becomes narrow, Therefore, although side members 9a of the backrest 3 is in the form of outwardly curved concave shape, also the connecting piece 42 side Curved outwardly in a concave shape so as to follow the shape of the member 9a. Further, the side member 9a and the center stay 41 have substantially the same left and right lengths.

The side stay 40 and the center stay 41 have a plate-like structure in which the front and rear surfaces are wide surfaces. As shown in FIG. 10, ribs 43 are integrally provided on the rear surfaces of the side stay 40 and the center stay 41. Yes. Accordingly, the cross-sectional shapes of the side stay 40 and the center stay 41 are laterally T-shaped. The rear surface of the rib 43 is flush with the rear surface of the connecting piece 42. The connecting piece 42 has the appearance of a thin strip, and therefore can be easily deformed so that the angle of the lateral direction V widens or narrows. That is, in the lumbar support member 11 , the density of the stays 40 and 41 is high. For this reason, the lumbar support part has higher rigidity than other parts.

  Since the group of the side stays 40 and the center stays 41 are arranged in multiple stages, left and right horizontally long spaces 44 are vacant between the side stays 40 adjacent to each other vertically and between the center stays 41. . In the present embodiment, the vertical width dimension of the space 44 is about twice the vertical width of the stays 40 and 41 except for the lumbar support portion. In the lumbar support portion, the vertical width dimension of the space 44 is set to be the same as the vertical width of the stays 40 and 41. For this reason, the lumbar support portion has high rigidity.

  Of course, the vertical width and pitch (density) of the side stay 40 and the center stay 41 can be arbitrarily set. For example, the vertical width dimension of the stays 40 and 41 and the space 45 can be set to the same level over the entire vertical direction. The vertical width dimension of the stays 40 and 41 can be made smaller than the vertical width dimension of the space 45 throughout.

Further, in the present embodiment, the body support portion 10 side stays 40 of two rows and one column is constituted by the center stay 41 need not be limited thereto, without providing the center stay 41, left and right It is also possible to configure the side stay 40 with a single connecting piece 42 that connects the side stay 40, or with two rows of side stays 40 and two rows of intermediate stays positioned therebetween. When two rows of intermediate stays are provided, three connecting pieces 42 are required. Furthermore, the body support portion 10 can also be constituted by five rows of stay groups of two rows of side stays 40, one row of center stays 41, and two rows of intermediate stays. Furthermore, the backrest 3 can adopt other forms.

(5) Summary Next, the operation will be described with reference to FIG. 11 (this description assumes a state in which a person with a general weight / physique is using). First, the locking state will be described.

  For example, the body pressure of the seated person in the rocking state acts on the backrest 3 from the front as shown by the arrow F, and the load acting on the backrest 3 is supported by the first support device 12 and the second support device 13. The first support device 12 can be bent and deformed in a side view so that the upper end moves rearward with a load from the front as indicated by an arrow Y, while the second support device 13 has a distal end as indicated by an arrow X. Can be bent and deformed in plan view so as to move backward, but since the second support device 13 has high rigidity, the back frame 4 of the backrest 3 is firmly held by the second support device 13 and is seated. The lumbar region is held stably.

On the other hand, the moment due to locking greatly acts on the upper end portion of the backrest 3 , but the first support device 12 is less rigid than the second support device 13 and easily deforms due to body pressure. The backrest 3 can be deformed as its upper end approaches the upper end of the back frame 4. This bending deformation of the backrest 3 can improve the cushioning property at the time of locking.

  In addition, when a person twists the upper body to the right or left in the locked state or shifts the shoulder to the right or left, the left and right spring portions 12a constituting the first support device 12 bend and deform unevenly. Thus, the backrest 3 can be deformed so as to be twisted following the twisting or shifting of the body. Therefore, the backrest 3 can be made to follow changes in the posture of the body, and as a result, comfort can be improved.

As apparent from FIG. 11, the backrest 3 are curved loosely forward concave in plan view, the degree of curvature They become largest at around the lumbar support member 11, the upper end portion almost become a flat state Yes. For this reason, it is easy to shift the shoulder (or a portion close to the shoulder) to the left and right while holding the waist portion so as not to be shifted to the left and right. From this point, high comfort can be obtained.

As shown in FIG. 2B, in the neutral state where the seated person is not leaning on the backrest 3, the backrest 3 is slightly tilted backward, and the lumbar support member 11 is located at the foremost position. When the user performs desk work such as operating a personal computer, the user takes a posture in which his / her waist is placed on the lumbar support member 11 of the backrest 3, but the second support device 13 has high rigidity and is seated in a neutral state. The back 3 is not bent and deformed by the body pressure of the person, and the human waist is stably supported by the back 3. For this reason, the upper body of the user is held in a preferable posture in which the back is not stretched and the back is stretched. Therefore, the posture maintaining function in the neutral state (non-locking state) is also excellent.

The backrest 3 of the present embodiment is such that the side support 40 and the center stay 41 are displaced up and down, and the connecting piece 42 is in a zigzag form, so that the body support portion 10 is caused by the body pressure of the seated person. It can bend and deform so that it can be swollen back. For this reason, while being excellent in the fitting property to a user's body, it is excellent also in the followable | trackability to a body movement.

Further, the connecting pieces 42 adjacent to each other in the vertical direction are deformed so as to reduce the mutual opening angle (V angle), whereby the center stay 41 tends to shift backward, and as a result, the body support portion 10 is deformed so as to expand backward. For this reason, the fit to a cushion and a user's body can be improved.

  According to the present invention, a chair with improved comfort in a leaning state can be provided. Furthermore, it is possible to provide a chair that can ensure strength and save manufacturing effort and prevent variation in quality.

1 leg device 2 seat 3 backrest 4 back frame
4a Vertical member
4b connecting part 5 leg support 6 central tube 7 base 8 joint member 9 frame 9a side member 9b upper member 9c lower member 10 body support part 11 lumbar support member 12 first support device 12a spring part 12b upper attachment part 12c lower attachment part 13 Second support device 13a Arm portion 13b Rear boss portion 13c Front boss portion 13e Flange 15 Rear first recess 16 First bolt 18 Inner wall 19 Intermediate wall 22 Second bolt 23 Nut holding portion 24 Stopper piece 25 Back side first 2 concave portion 25a inner plate 26 third bolt 27 front second concave portion 28 bolt hole 29 nut mounting groove 30 step portion 31 notch portion 34 slide boss body 35 guide frame portion 36 knob 36a forward projecting portion 37 nut insertion groove 38 hole for stopper 40 Side stay 41 Center stay 4 2 connecting piece 43 rib 44 space 45 space 111 lumbar support member 140 stay 141 stay

Claims (8)

A seat and a backrest, and a back frame having a rigid structure arranged with a space behind the backrest,
The backrest includes a first support device disposed at a height position near an upper end of the backrest and a second support device disposed at a position lower than the first support device and higher than a seat surface. Attached to the frame,
The first support device is attached to a portion of the backrest that is close to the left and right intermediate portion of the upper end,
The second support device is attached to the left end and the right end of the backrest,
Chair child. While the first support device has elastic strength that allows the seat back to be deformed and the upper part of the backrest is displaced backward when the body pressure of the seated person is applied to the backrest,
Said second supporting device are either rigid not to deform bend the seated person essentially even if a body pressure, or, from the previous SL first support device which is elastically deformed by body pressure of a seated person The elastic strength is also difficult to deform ,
The chair according to claim 1. The first support device is vertically long in a side view, while the second support device is separated into two on the left and right, and the left and right second support devices are the second on the left and right in a plan view. It is in an inclined posture that widens as the distance between the support devices goes to the front,
The chair according to claim 1 or 2. While the back frame, have a pair of elongated members, Vertical members of these right and left, the upper end inclined such that the distance narrows toward the top are connected together through a connecting portion,
The first support device is attached to a connecting portion of the back frame, and the second support device is attached to left and right longitudinal members.
Chair as claimed in any one of the 請 Motomeko 1-3. The backrest includes a resin main member attached to the back frame, and the main member includes a loop-shaped frame body that forms an outer periphery and a body support portion that is positioned inside the loop-shaped frame body. And
The body support portion has a number of slits or holes and has a strength that easily elastically deforms due to the body pressure of the seated person.
The chair as described in any one of Claims 1-4. Wherein the front face of the main member is disposed cushions, at least the cushion is covered with a skin material,
Chair described in 請 Motomeko 5. The lower end of the main member is located near the seat surface,
A lumbar support member that supports the waist of the seated person is disposed on the front surface or the rear surface of the main member,
The main member is attached to the second support device at a position slightly above the lumbar support member,
請 Motomeko 5 or chair as described in 6. The backrest tilts backward against the rocking spring when the body pressure of the seated person is applied,
Chair as claimed in any one of the 請 Motomeko 1-7.

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