JP5953737B2 - Chair - Google Patents

Description

  The present invention relates to a chair having a hard portion that is elastically deformed when a load is applied.

  Various parts such as a lumbar support and an armrest are provided with various elastic properties for appropriate purposes, such as a lumbar support and an armrest (for example, Patent Document 1). See).

  However, in this type of chair, if the part is designed to be soft and elastically deformed in order to improve the comfort of use, it may be deformed too much when a large load is applied. It is necessary to separately provide a stopper or the like for keeping the pressure within a certain range. When a stopper or the like is provided outside, there may be a problem that the cost increases due to an increase in the number of parts, an increase in the attaching process of these parts, or the like. In addition, when the stopper or the like is exposed to the outside, the appearance as a chair is affected, and the design may be deteriorated. On the other hand, in the case where a stopper or the like cannot be provided outside, there is a problem that the above-mentioned parts have to be set firmly so that excessive deformation does not occur, and the usability cannot be improved.

  By the way, a load receiving surface of this type of component may be provided with a cushion for softly receiving a load from a seated person, a bumper for reducing an impact at the time of a collision, or the like. However, if a cushion or bumper is attached to the surface of an elastically deformed part by bonding or the like, there is a problem that these cushion or bumper is likely to be detached due to a repeatedly acting load or impact load.

JP 2006-280417 A

  An object of this invention is to provide the chair which can solve the above subjects.

  The present invention employs the following configuration in order to solve the above-described problems. That is, the chair according to the present invention comprises a part having a receiving surface for receiving a load, and the part has a hard part having an elastic deformation region that is elastically deformed when a load is applied thereto. A recessed portion provided with an opposing surface that is provided in the rigid portion so as to open toward the receiving surface and that approaches the elastic deformation, an internal elastomer disposed in the recessed portion, and the internal elastomer And an external elastomer provided along the receiving surface, and when the hard portion is deformed to a predetermined elastic deformation limit, the opposing surfaces are close to each other via the internal elastomer. The deformation of the hard portion exceeding the elastic deformation limit is suppressed.

  Here, “adjacent” means that the elastic material between the opposing surfaces, that is, the internal elastomer disposed in the recessed portion gradually approaches while being compressed and deformed.

  If this is the case, there is no need to provide an external stopper or the like to prevent excessive deformation when a large load is applied, and the parts should have an appropriate elastic deformation to improve usability. Can do. Furthermore, since the inner elastomer and the outer elastomer are integrally provided, the inner elastomer disposed in the recessed portion serves as an attachment portion, and the outer elastomer is firmly held. Therefore, it is possible to solve the problem that the conventional cushion and bumper are likely to come off due to a repeatedly acting load or impact load.

The external elastomer is a sheet for receiving a load from a seated person .

It said component, lumbar support der is, the receiving surface is formed on the forward face of the lumbar support.

The recessed portion is obtained by setting a large opening width of the inner side than the opening width of the opening end side, the inner elastomer der those filled in the whole of the recessed portion Runode, by the anchor effect, The problem that the external elastomer is detached can be suppressed.

The hard part includes a thin part and thick parts having a thickness dimension larger than that of the thin part provided on both sides of the thin part, and the recessed part is formed between the thick parts. ing.

  Since this invention is the above structures, the chair which can solve the above subjects can be provided.

The plane sectional view showing typically the chair of a 1st embodiment of the present invention. Action explanatory drawing which expands and shows the principal part of the embodiment. Action explanatory drawing which expands and shows the principal part of the embodiment. The side view which shows typically the chair which is a reference example . The figure which shows a reference example typically. The figure which shows a reference example typically. The figure which shows a reference example typically. The figure which shows a reference example typically. The figure which shows a reference example typically. The figure which shows a reference example typically. The figure which shows a reference example typically. The figure which shows the modification of the internal elastomer of this invention typically.

<First Embodiment>
First, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, the chair 1 of this embodiment includes a leg (not shown), a seat supported by the leg through a support mechanism, and a backrest 5 supported by the seat. It has. The backrest 5 includes a back frame 51 that forms a pair of left and right sides, and a tension fabric 52 that is stretched between the back frames 51. In other words, the chair 1 includes a backrest 5 in which a mesh-like tension fabric 52 is stretched between left and right back frames 51, and has a lumbar support 85 on the waist of the backrest 5.

  The lumbar support 85 has both ends supported by the left and right back frames 51 and a holding portion 851 disposed on the back side of the upholstery 52 and a load placed on the front surface of the holding portion 851 to receive a load from a seated person. And a lumbar support body 852 made of a hard synthetic resin that is elastically deformable in the thickness direction.

  The present invention is applied to the lumbar support main body 852 of the chair 1 as described above.

  That is, as shown in FIGS. 1 to 3, the chair 1 includes a lumbar support main body 852 that is a component having a forward facing surface 853 that receives a load, and the lumbar support main body 852. However, the hard part 11 having an elastic deformation region that is elastically deformed when a load is applied, and the opposing part forming a pair that opens to the hard part 11 on the side of the forward facing surface 853 and approaches with the elastic deformation. A concave portion 112 having a surface 113, an internal elastomer 12 disposed in the concave portion 112, and an external elastomer 15 which is integrated with the internal elastomer 12 and is provided along the forward facing surface 853. When the hard part 11 is deformed to a predetermined elastic deformation limit, the opposing surfaces 113 are close to each other via the inner elastomer 12, It made so as to suppress the deformation beyond the elastic deformation limit of the serial rigid portion 11.

  1-3, the lumbar support main body 852 is mainly composed of the hard portion 11, and the tip 113a side is located at the elastically deforming portion of the lumbar support main body 852, which is a part that elastically deforms in response to a load. A pair of open facing surfaces 113 are integrally provided so that when the lumbar support body 852 is elastically deformed, the distal end 113a side of the facing surface 113 comes close to the elastic deformation characteristics of the lumbar support body 852. It is configured. Here, the “front end 113a of the facing surface 113” means the end of the facing surface 113 that is displaced more largely than the base end of the facing surface 113 that is difficult to be displaced when the component is elastically deformed. The “front end 113a side of the facing surface 113” means the entire portion of the facing surface 113 that is closer to the front end 113a than the base end. That is, the lumbar support main body 852 includes the hard portion 11 that is elastically deformed when a load from a seated person is applied, and a surface on the side that receives compressive stress due to the elastic deformation of the hard portion 11, that is, a forward-facing surface. 853 is provided with a concave portion 112, and a pair of opposing surfaces 113 are formed inside the concave portion 112 so as to come close to the elastic deformation. When the hard portion 11 is deformed to a predetermined elastic deformation limit, the opposing surface is formed. The surfaces 113 are close to each other via the internal elastomer 12 so as to suppress the deformation of the hard portion 11 beyond the elastic deformation limit. In other words, the lumbar support main body 852 includes the hard portion 11 that elastically deforms in the bending direction when a load is applied, and the elastic portion is inwardly viewed from the bending direction of the hard portion 11. The opposing surfaces 113 forming a pair approaching each other are formed. The inner side when viewed from the bending direction is the side on which the internal stress in the compression direction increases as the bending deformation progresses as a load is applied, and the center of curvature when bending in a direction in which the radius of curvature decreases Point to the side. The lumbar support main body 852 is such that the side on which a load is applied when seated is the inner side of elastic deformation. In this embodiment, a plurality of recessed portions 112 are formed in the center portion of the forward facing surface 853 of the lumbar support main body 852 at intervals in the left-right direction, and each of the recessed portions 112 is filled with the internal elastomer 12. is there. In the present embodiment, an external elastomer 15 is provided which is integrated with the internal elastomer 12 and is provided along the forward facing surface 853 of the lumbar support main body 852 which is the receiving surface. The external elastomer 15 has a sheet shape for receiving a load from a seated person, and covers the central portion of the forward facing surface 853 of the lumbar support main body 852. Specifically, the left and right ends of the external elastomer 15 are positioned in the vicinity of the opening end 114 of the recessed portion 112 on both the left and right ends, and the hard portion 11 between the recessed ends 112 and the recessed portions 112. Covers the front side of The recessed portion 112 is open to the forward facing surface 853 of the hard portion 11 and both side surfaces (not shown) continuous to the forward facing surface 853, specifically, the upper surface and the lower surface of the hard portion 11, and the recessed portion A part of the inner side of the portion 112 facing the portion 112 is used as the facing surface 113. In other words, the recessed portion 112 has a larger opening width 116 on the back side than the opening width 115 on the opening end side, and the inner side on the opening end 114 side serves as the facing surface 113. In other words, the hard portion 11 includes a thin portion 91 and thick portions 92 that are provided on both sides of the thin portion 91 and have a thickness dimension larger than that of the thin portion 91. The recessed portion 112 is formed between the portions 92.

  With such a chair 1, when the seated person's waist is strongly pressed against the lumbar support 85, the hard part 11 of the lumbar support body 852 is elastically deformed, and the seated person's waist is softly received. When the hard part 11 in the lumbar support main body 852 reaches the elastic deformation limit, the internal elastomer 12 disposed between the opposing surfaces 113 of the recessed portions 112 is compressed to the limit, and the opposing surface 113 is compressed. Will be in close proximity via the inner elastomer 12 formed. Therefore, further elastic deformation of the lumbar support main body 852 is suppressed. Therefore, with such a lumbar support 85, it is possible to keep the seated person's waist soft while maintaining a certain degree of moderation.

  As described above, the chair 1 according to the present embodiment includes the lumbar support main body 852 having the forward facing surface 853 that receives a load from the seated person, and the lumbar support main body 852 includes: A hard part 11 having an elastic deformation region that is elastically deformed when a load is applied, and a pair of opposing surfaces 113 that are provided in the hard part 11 so as to open toward the front face 853 and that approach each other with the elastic deformation. A recessed portion 112 having an inner elastomer 12, an inner elastomer 12 disposed in the recessed portion 112, and an outer elastomer 15 which is integrated with the inner elastomer 12 and is provided along the forward facing surface 853. When the hard portion 11 is deformed to a predetermined elastic deformation limit, the opposing surfaces 113 come close to each other through the internal elastomer 12 and the hard portion 11 Since the deformation of the portion 11 exceeding the elastic deformation limit is suppressed, there is no need to provide a stopper or the like for suppressing excessive deformation when a large load is applied, and the lumbar support body 852 is not provided. It is possible to improve the feeling of use by giving an appropriate elastic deformation.

  Furthermore, since the inner elastomer 12 and the outer elastomer 15 are provided integrally, the inner elastomer 12 not only can be easily formed, but the inner elastomer 12 disposed in the recessed portion 112 serves as a mounting portion, and the outer elastomer 15 serves as the lumbar support body 852. Can be prevented from coming off unexpectedly. Therefore, it is possible to solve the problem that the conventional cushion is easily detached due to a repeatedly acting load or the like.

  Since the external elastomer 15 is a thin sheet for receiving a load from a seated person, it is easy to follow the curved shape of the forward facing surface 853 of the lumbar support main body 852. Further, since the external elastomer 15 is arranged over substantially the entire central portion on the side of the forward facing surface 853 that receives the load of the seated person, it is possible to obtain appropriate softness due to the external elastomer 15 when drowning on the backrest 5. . Therefore, the forward facing surface 853 of the lumbar support main body 852 can be cushioned, and the seating feeling can be improved. In particular, since the external elastomer 15 is elastically deformable, the external elastomer 15 is compressed by a load applied to the back of the seated person, so that an appropriate repulsive force is accumulated.

  That is, in the present embodiment, the component of the present invention is the lumbar support 85, and the receiving surface of the present invention is formed on the forward facing surface 853 of the lumbar support 85, so that the lumbar support 85 is sufficiently elastically deformed. The seating feeling can be improved, and elastic deformation beyond a certain level is restricted, so that deformation exceeding a predetermined elastic deformation shape is not made, and the user can feel safe. And if it is the lumbar support 85 like this embodiment, although the recessed part 112 is provided so that the front surface 853 which receives a compressive stress by a seated person's load may open, this recessed part 112 Since the external elastomer 15 is disposed on the front surface, the feel of the portion that directly contacts the body of the seated person can be improved.

  In the present embodiment, the recessed portion 112 has a larger opening width 116 on the back side than the opening width 115 on the opening end side, and the inner elastomer 12 is filled in the entire recessed portion 112. Therefore, the external elastomer 15 can be hardly detached from the lumbar support main body 852 by a so-called anchor effect. That is, when the external elastomer 15 tries to move in the thickness direction due to a load that repeatedly acts on the external elastomer 15, the internal elastomer 12 provided integrally with the external elastomer 15 also tries to move in the thickness direction. This is because the inner side portion of the inner elastomer 12 is caught by a protrusion near the opening end 114 of the recessed portion 112, and this engagement state is not released unless a certain force is applied.

  The hard portion 11 includes a thin portion 91 and thick portions 92 that are provided on both sides of the thin portion 91 and have a thickness dimension larger than that of the thin portion 91. Since the recessed portion 112 is formed, the thick portion 92 has rigidity capable of withstanding a seating load, and the thin portion 91 is elastically deformed in the thickness direction, whereby the lumbar support body 852 is elastic while maintaining strength. It can be deformable. In particular, the hard portion 11 includes thin portions 91 and thick portions 92 alternately. Since the recessed portions 112 are formed between adjacent thick portions 92, the upper body is twisted. In this case, the lumbar support 85 is appropriately elastically deformed following the seated person.

  In particular, since the left and right ends of the outer elastomer 15 are arranged so as to be positioned in the vicinity of the opening ends 114 of the recessed portions 112 on the left and right ends, the left and right ends of the outer elastomer 15 are separated from the front facing surface 853 of the lumbar support main body 852. It can suppress that it comes off. Further, since the intermediate portion of the outer elastomer 15 in the left-right direction is provided so as to cover the plurality of recessed portions 112 spaced in the left-right direction, the intermediate portion of the outer elastomer 15 is also removed from the front facing surface 853 of the lumbar support main body 852. It can suppress that it comes off. That is, the adjacent internal elastomers 12 are integrally connected by the external elastomer 15, and the seated person does not directly touch the opposing surface 113 when the hard portion 11 is elastically deformed. The occurrence of a problem that the clothes or the like are pinched can be suppressed. Further, when the surface of the external elastomer 15 is touched, an appropriate elasticity can be obtained.

Next, a reference example will be described with reference to FIG.

  As shown in FIG. 4, the chair 1 according to this embodiment includes a leg 2, a seat 4 supported by the leg 2, and a rear end portion of the seat 4 by using elastic deformation of members. The backrest 5 is operatively supported, and the armrest 84 is provided between an intermediate portion of the backrest 5 and the seat 4.

  The armrest 84 is made of hard synthetic resin, and is curved so as to protrude toward the front upper side. One end of the armrest 84 is pivotally attached to an intermediate portion of the backrest 5 via an upper shaft 841, and the other end is pivotally attached to an intermediate portion of the seat 4 via a lower shaft 842.

  The chair 1 is configured such that the backrest 5 tilts backward with the elastic deformation of the member due to the backward load acting on the backrest 5, and the armrest 84 is also elastically deformed at that time. It is like that. That is, when the backrest 5 tilts backward with respect to the seat 4, the distance between the upper shaft 841 and the lower shaft 842 gradually increases, and the armrest 84 is elastically deformed in a direction that reduces the degree of curvature. Yes.

  That is, as shown in FIGS. 1 to 3, the chair 1 includes an armrest 84 that is a component having an upward surface 843 that is a receiving surface that receives a load. A hard portion 11 having an elastic deformation region that elastically deforms when applied, and an opposing surface 113 that is provided in the hard portion 11 so as to open toward the upward surface 843 and that makes a pair approaching the elastic deformation. A concave portion 112, an internal elastomer 12 disposed in the concave portion 112, and an external elastomer 15 that is integrated with the internal elastomer 12 and is provided along the upward surface 843. When the hard part 11 is deformed to a predetermined elastic deformation limit, the opposing surfaces 113 come close to each other via the internal elastomer 12, and the elastic deformation limit of the hard part 11 is reached. It made so as to suppress the deformation beyond.

  As shown in FIG. 4, the armrest 84 is mainly composed of the hard portion 11, and forms a pair in which the tip 113 a side is opened at a portion of the armrest 84 that is elastically deformed by receiving a load. The opposed surface 113 is provided integrally, and when the armrest 84 is elastically deformed, the distal end 113a side of the opposed surface 113 comes close to the elastic surface, and the elastic deformation characteristics of the armrest 84 change. Here, the “front end 113a of the facing surface 113” means the end of the facing surface 113 that is displaced more largely than the base end of the facing surface 113 that is difficult to be displaced when the component is elastically deformed. The “front end 113a side of the facing surface 113” means the entire portion of the facing surface 113 that is closer to the front end 113a than the base end. That is, the armrest 84 includes the hard portion 11 that is elastically deformed when a load from a seated person is applied. The armrest 84 is provided on a surface that receives compression stress by the elastic deformation of the hard portion 11, that is, an upward surface 843. A recessed portion 112 is provided, and a facing surface 113 is formed inside the recessed portion 112 as a pair approaching the elastic deformation. When the hard portion 11 is deformed to a predetermined elastic deformation limit, the facing surface 113 is formed. They are close to each other through the internal elastomer 12 to prevent deformation of the hard portion 11 beyond the elastic deformation limit. In other words, the armrest 84 includes the hard portion 11 that elastically deforms in the bending direction when a load is applied. The armrest 84 approaches the inside in accordance with the elastic deformation as viewed from the bending direction of the hard portion 11. The opposing surfaces 113 forming a pair are formed. The inner side when viewed from the bending direction is the side on which the internal stress in the compression direction increases as a load is applied and the bending deformation progresses, and the center of curvature when bending in the direction in which the radius of curvature increases And the opposite side. The armrest 84 is such that the side on which the load is applied when seated is the inside of the elastic deformation. In this embodiment, a plurality of recessed portions 112 are formed on the upward surface 843 of the central portion of the armrest 84 at intervals in the left-right direction, and the entire recessed portions 112 are filled with the internal elastomer 12. In this embodiment, an external elastomer 15 is provided which is integrated with the internal elastomer 12 and is provided along the upward surface 843 of the armrest 84 which is the receiving surface. The external elastomer 15 is in the form of a sheet for receiving a load from a seated person and covers the central portion of the upward surface 843 of the armrest 84. Specifically, the hard portion 11 between the recessed portion 112 and the opening end 114 side of the recessed portion 112 so that both the front and rear ends of the external elastomer 15 are positioned in the vicinity of the opening end 114 of the recessed portion 112 on both the front and rear end sides. Covers the front side of The recessed portion 112 is open on the upward surface 843 of the hard portion 11 and both side surfaces 117 continuous to the upward surface 843, that is, on the left and right side surfaces. Is the facing surface 113. In other words, the recessed portion 112 has a larger opening width on the back side than the opening width on the opening end side, and the inner side on the opening end 114 side serves as the facing surface 113. In other words, the hard portion 11 includes a thin portion 91 and thick portions 92 that are provided on both sides of the thin portion 91 and have a thickness dimension larger than that of the thin portion 91. The recessed portion 112 is formed between the portions 92.

  In the case of such a chair 1, when the backrest 5 tilts backward from the seat 4 from the state shown by the solid line in FIG. 4, the hard portion 11 of the armrest 84 is elastically deformed to gently receive the seated person. become. As shown by a two-dot chain line in FIG. 4, when the hard portion 11 in the armrest 84 reaches the elastic deformation limit, the elastomer 12 disposed between the opposing surfaces 113 of the recessed portions 112 is compressed to the limit. The opposed surface 113 comes close to the compressed elastomer 12. Therefore, further elastic deformation of the armrest 84 is inhibited, and a deterring force also acts on the back tilting operation of the backrest 5. Therefore, in such a case, the armrest 84 serves as an auxiliary reaction force mechanism for returning the backrest 5 to the initial posture, and to prevent the backrest 5 from tilting backward too much. It will play a role as a stopper.

  As described above, the chair 1 according to the present embodiment includes the armrest 84 having the upward surface 843 that receives the load from the seated person, and the armrest 84 is subjected to the load. A concave portion provided with a hard portion 11 having an elastic deformation region that is sometimes elastically deformed, and a facing surface 113 that is provided in the hard portion 11 so as to open toward the upward surface 843 and that makes a pair approaching with the elastic deformation. A portion 112, an inner elastomer 12 disposed in the recessed portion 112, and an outer elastomer 15 which is integrated with the inner elastomer 12 and is provided along the upward surface 843. When 11 is deformed to a predetermined elastic deformation limit, the opposing surfaces 113 are close to each other via the internal elastomer 12 and exceed the elastic deformation limit of the hard portion 11. Since the deformation is suppressed, there is no need to provide an external stopper or the like for suppressing excessive deformation when a large load is applied. Can be better.

  Further, since the inner elastomer 12 and the outer elastomer 15 are provided integrally, the inner elastomer 12 not only can be easily formed, but the inner elastomer 12 disposed in the recessed portion 112 serves as a mounting portion, and the outer elastomer 15 is unexpectedly moved from the armrest 84. Can be prevented from coming off. Therefore, it is possible to solve the problem that the conventional cushion is easily detached due to a repeatedly acting load or the like.

  Since the external elastomer 15 is in the form of a thin sheet for receiving a load from a seated person, it is easy to follow the curved shape of the upward surface 843 of the armrest 84. Moreover, since the external elastomer 15 is arranged over substantially the entire center portion on the side of the upward surface 843 that receives the load of the seated person, it is possible to obtain appropriate softness by the external elastomer 15 when the arm is placed on the armrest 84. it can. Therefore, the upward surface 843 of the armrest 84 can be provided with cushioning properties, and the seating feeling can be improved. In particular, since the external elastomer 15 is elastically deformable, an appropriate repulsive force is accumulated by compressing the external elastomer 15 by a load below the seated person.

That is, in this reference example, the part is the armrest 84, and the receiving surface of the present invention is formed on the upward surface 843 of the armrest 84. Therefore, the armrest 84 is sufficiently elastically deformed to have a good feeling of use. In addition, since elastic deformation exceeding a certain level is restricted, deformation exceeding a predetermined elastic deformation shape is not performed, and a load can be applied with peace of mind. In the case of the armrest 84 as in the present embodiment, the recessed portion 112 is provided so that the upward surface 843 that receives the compressive stress by the load of the seated person is opened. Since the elastomer 15 is disposed, it is possible to improve the feel of the portion that directly contacts the seated person's body.

  In the present embodiment, as in the first embodiment, the recessed portion 112 has a larger opening width on the back side than the opening width on the opening end side, and the inner elastomer 12 has the recessed portion. Since the whole 112 is filled, the outer elastomer 15 can be hardly detached from the armrest 84 by a so-called anchor effect.

  The hard portion 11 includes a thin portion 91 and thick portions 92 that are provided on both sides of the thin portion 91 and have a thickness dimension larger than that of the thin portion 91. Since the recessed portion 112 is formed, the thick portion 92 has rigidity capable of withstanding a seating load, and the thin portion 91 is elastically deformed in the thickness direction, so that the armrest 84 is elastically deformed while maintaining strength. Can be obtained.

  In particular, since the front and rear ends of the outer elastomer 15 are arranged near the opening end 114 of the recessed portion 112 on both the front and rear ends, the front and rear end portions of the outer elastomer 15 are disengaged from the upward surface 843 of the armrest 84. Can be suppressed. Further, since the intermediate portion of the outer elastomer 15 in the front-rear direction is provided so as to cover the single recessed portion 112, the intermediate portion of the outer elastomer 15 is also prevented from being detached from the upward surface 843 of the armrest 84. it can. That is, the adjacent internal elastomers 12 are integrally connected by the external elastomer 15, and the seated person does not directly touch the opposing surface 113 when the hard portion 11 is elastically deformed. The occurrence of a problem that the clothes or the like are pinched can be suppressed. Further, when the surface of the external elastomer 15 is touched, an appropriate elasticity can be obtained.

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

  In the embodiment described above, the ratio of the thickness dimension between the thick part and the thin part may be set as appropriate according to the required elastic deformation characteristics.

  Of course, the location and number of the recessed portions are not limited to those described above. In other words, the arrangement interval, shape, size, etc. of the recessed portions can be variously changed, and it is also possible to form the recessed portions having various characteristics in each part of one part so as to vary the deformation characteristics. is there. The final deformed shape of the component can be freely designed by appropriately selecting the arrangement interval, shape, size, etc. of these recessed portions.

  Furthermore, at least one of the internal elastomer and the external elastomer may be provided with a bulge restricting portion for suppressing the external elastomer from bulging outward when the hard portion is elastically deformed. As an example, as shown in FIG. 12, it is conceivable that the bulging restricting portion is a gap 12 a formed inside the internal elastomer 12. In such a case, when the load is applied to the hard portion 11 and the opposing surfaces 113 provided on the inner side as viewed from the bending direction of the hard portion 11 approach each other, the pressing of the elastomer 12 around the gap 12a is performed. The gap 12a is deformed by the pressure. Therefore, the outward swelling of the external elastomer 15 can be suppressed as compared with the case where the gap 12a is not formed. The bulge restricting portion may be a gap provided between the inner elastomer and the recessed portion, or a slit-like member provided in the inner elastomer or the outer elastomer.

  In the embodiment described above, the opposing surface is provided integrally with the hard part that receives the load of the seated person, but may be provided separately. As a specific example, one or a plurality of mounting members that form a pair of opposing surfaces on the surface that receives compression stress due to elastic deformation of a hard portion that is elastically deformed when a load is applied are fixed to screws or the like. What is necessary is just to make the space between the opposing surfaces of this attachment member into a recessed part by attaching via a wearer.

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

DESCRIPTION OF SYMBOLS 1 ... Chair 11 ... Hard part 112 ... Recessed part 113 ... Opposite surface 115 ... Opening width on the opening end side 116 ... Opening width on the back side 12 ... Internal elastomer 15 ... External elastomer 84 ... Armrest 843 ... Upward surface 85 ... Lumber support 853 ... forward-facing surface 91 ... thin part 92 ... thick part

Claims (2)

A chair comprising a part having a receiving surface for receiving a load,
A hard part having an elastic deformation region in which the part is elastically deformed when a load is applied, and a facing surface that is provided by opening the hard part on the receiving surface side and approaches the hard part with the elastic deformation A concave portion provided with, an internal elastomer disposed in the concave portion, and an external elastomer that is integrated with the internal elastomer and is provided along the receiving surface,
When the hard portion is deformed to a predetermined elastic deformation limit, the opposing surfaces are close to each other via the internal elastomer, and deformation of the hard portion exceeding the elastic deformation limit is suppressed . ,
The external elastomer is a sheet for receiving a load from a seated person,
The component is a lumbar support, and the receiving surface is formed on a front-facing surface of the lumbar support.
The recessed portion is one that has a larger opening width on the back side than the opening width on the opening end side, and the inner elastomer is filled in the entire recessed portion,
The hard part includes a thin part and thick parts having a thickness dimension larger than that of the thin part provided on both sides of the thin part, and the recessed part is formed between the thick parts. chair, characterized in that is. It is provided with a bulging restricting portion for suppressing the outer elastomer from bulging outward when the hard portion is elastically deformed, and the bulging restricting portion is formed inside the inner elastomer. The chair according to claim 1, wherein the gap is a gap.

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