US20160135603A1 - Chair - Google Patents

Chair Download PDF

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Publication number
US20160135603A1
US20160135603A1 US14/896,236 US201414896236A US2016135603A1 US 20160135603 A1 US20160135603 A1 US 20160135603A1 US 201414896236 A US201414896236 A US 201414896236A US 2016135603 A1 US2016135603 A1 US 2016135603A1
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United States
Prior art keywords
backrest
support device
support
attached
seat occupant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/896,236
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English (en)
Inventor
Eric Chan
Seitaro KOMOTO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Itoki Corp
Original Assignee
Itoki Corp
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Filing date
Publication date
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Application filed by Itoki Corp filed Critical Itoki Corp
Priority to US14/896,236 priority Critical patent/US20160135603A1/en
Assigned to ITOKI COPRORATION reassignment ITOKI COPRORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHAN, ERIC, KOMOTO, SEITARO
Publication of US20160135603A1 publication Critical patent/US20160135603A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/36—Support for the head or the back
    • A47C7/40—Support for the head or the back for the back
    • A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
    • A47C7/462—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs adjustable by mechanical means

Definitions

  • the present invention relates to a chair and, in particular, treats an office-use chair as a preferred object.
  • the first factor to be owned by a chair is comfort to a user.
  • comfort In particular, in a chair used in an office, a person continues sitting down for a long time and hence comfort is an important factor. There are some factors damaging comfort.
  • factors include a feeling of oppression caused by a situation that the portion hitting the body is hard and a feeling of tightness that the body cannot easily be moved.
  • countermeasures are taken in order to reduce the feeling of oppression and the feeling of tightness.
  • the problem of the feeling of oppression is handled such that a cushion is arranged in the seat or the backrest, the seat or the backrest is constructed from a mesh, or the like. Adoption of a deformable structure in the seat plate or the backrest plate is also effective in improving softness.
  • Documents 1 to 4 describes a configuration that a backrest is supported by the back frame at three positions consisting of two right and left positions in the upper end part and of the right-left middle part of the lower end part.
  • the backrest In a case that the backrest is freely deformed by the body pressure of the seat occupant, the stability of the body is degraded and hence comfort is degraded on the contrary. That is, the backrest is required to have a function of firmly supporting the body.
  • the backrest In particular, in a case that a person sits on the chair and performs various kinds of desk work, when the person slouches, the internal organs are pressed and hence an intense stress acts on the body. Thus, a high necessity is concluded that even in a non-rocking state, the body (especially, the lumbar) of the person is supported and held in a state that the back is straightened.
  • the backrest of a chair is provided with a back plate fabricated from resin.
  • a configuration is employed that the back plate has a flexible structure.
  • the applicant of the present application has disclosed that a large number of elongated grooves horizontally elongated in the right and left directions are provided in the back plate so that the body support part is constructed from the multi-stage band plate group.
  • a thin trimming groove is provided in the right and left end parts.
  • Document 6 discloses a back plate having a configuration similar to a honeycomb structure.
  • Document 7 discloses a backrest in which cross-shaped holes and straight-line-shaped holes are arranged regularly so that a structure similar to a mesh is formed.
  • the body support part of the backrest is formed in a mesh structure. Then, a group of thin lines constituting the body support part are individually bent and hence the thin lines are allowed to perform extensional deformation in accordance with the body pressure. Thus, the entire body support part can be deformed such as to become concave rearward.
  • the function of supporting the body achieved by the backrest is considered below.
  • a high flexibility alone is not sufficient and the function of stably supporting the body is also important. For example, when there is a tendency that the body shakes in a rocking state, in some cases, comfort is degraded on the contrary.
  • Patent Document 1 JP-A-2002-119366
  • Patent Document 2 JP-A-2004-129966
  • Patent Document 3 JP-A-2010-063831
  • Patent Document 4 U.S. Pat. No. 7,249,802
  • Patent Document 5 JP-A-2011-041615
  • Patent Document 6 Japanese Patent No. 4015673
  • Patent Document 7 U.S. Pat. No. 5,934,758
  • the invention of the present application has been devised in view of such present situations and is intended to provide a chair in which value in use has been enhanced and improvement has been achieved. Further, the present application includes a large number of improved configurations and hence to provide these may be an object.
  • the present application is constructed from a group of inventions having hierarchical and areal broadening. Then, typical modes thereof are identified as a first to a fifteenth invention.
  • the first invention constitutes a generic concept.
  • the basic configuration thereof includes: a seat; a backrest; and a back frame having a rigid structure and arranged behind the backrest with an interval in between.
  • the backrest is attached to the back frame by a first support device arranged at a height position close to an upper end of the backrest and by a second support device arranged at a position lower than the first support device and higher than the seat surface.
  • the first support device is attached to a part close to a right-left middle part of the upper end part in the backrest.
  • the first support device is attached to the upper end of the backrest or a vicinity thereof.
  • the backrest may run off over the first support device. That is, the attaching position of the first support device has a vertical width.
  • the second support device is similar.
  • the backrest is supported at three positions consisting of the right-left middle part of the upper end part and of two right and left positions thereunder. Then, in a case that the user sits down in a state of not leaning on the backrest in order to perform desk work like PC operation, the lumbar and the like can stably be supported by the portion supported at the two right and left positions within the backrest. Thus, the state that the back is straightened can appropriately be maintained and hence the user is allowed to take an appropriate working attitude.
  • the first support device is close to the right-left middle part of the backrest and hence the upper end part (or the upper part) of the backrest runs off to the outside in the right and left directions of the first support device so as to constitute free ends. That is, both right and left ends of the upper end part (the upper part) of the backrest serve as free ends not supported from the rear.
  • the backrest can be deformed such as to follow the twist of the body in a state of leaning on the backrest. This contributes to improvement in comfort in a leaning-on state.
  • the second invention is an example of expansion of the first invention.
  • the first support device has such an elastic strength that, when the body pressure of a seat occupant acts on the backrest, permits warp deformation and thereby allows an upper part of the backrest to move and deviate rearward, whereas the second support device has such a rigidity that, even when the body pressure of a seat occupant acts, bending deformation does not substantially occur or, alternatively, although elastic deformation is caused by the body pressure of the seat occupant, the second support device has the elastic strength with which a magnitude of the elastic deformation of the second device is lower than that of the first support device.
  • the first support device has a spring property.
  • the upper part of the backrest is allowed to move such as to approach the back frame. That is, a reaction force of the first support device acts on the upper part of the backrest from the rear and then this reaction force provides a cushion effect and, hence, comfort to the user.
  • the deformation in the first support device permits twist deformation in the backrest and hence also improves follow-up deformability in a case that the body is twisted in the right or left direction in a state that the person leans on the backrest.
  • the second support device is hardly deformed by the body pressure of a seat occupant or, alternatively, even in a case that deformation occurs, the magnitude thereof is smaller than that in the first support device.
  • the function of supporting the body in a leaning-on state is appropriately achieved.
  • the lower part of the backrest is excessively deformed in a leaning-on state such as a rocking state, the stability of the body is degraded so that, in some cases, comfort is degraded on the contrary.
  • the second invention even in a leaning-on state, the body is stably supported by the lower part of the backrest and hence excessive movement of the body is prevented so that comfort can be improved.
  • the third invention is an example of expansion of the first invention or the second invention.
  • the first support device is in an attitude elongated in up and down directions in side view
  • the second support device is separated into two right and left parts and then the right and left second support devices are in such an inclined attitude that an interval of the right and left second support devices becomes wider as going to a nearer side in plan view.
  • the first support device and the second support device may employ various modes.
  • the portion extending between the back frame and the backrest may be in a simple plate-shape configuration. This provides an advantage of simplified structure.
  • the first support device 12 is elongated in the up and down directions and hence can easily be deformed and bent rearward by the body pressure of a seat occupant. Thus, the follow-up property and the cushioning property against a change of the body can be improved.
  • the fourth invention is an example of expansion of the first invention or the second invention.
  • the back frame includes a pair of right and left vertically elongated members, these right and left vertically elongated members being inclined such that an interval becomes narrow as going upward, and upper ends being connected integrally through a linkage part, and the first support device is attached to the linkage part of the back frame and the second support device is attached to the right and left vertically elongated members.
  • the matter specific to the fourth invention may be applied also to the third invention.
  • the back frame may be constructed from one member located in the right-left middle part of the backrest or, alternatively, may employ a configuration of inverted U-shape having a right and a left vertical part.
  • the configuration (the configuration of inverted V-shape) of the fourth invention is employed, an advantage is obtained that a high strength can be ensured by employing a simple configuration.
  • the fifth invention is an example of expansion of the first invention or the second invention.
  • the backrest includes a main member fabricated from resin and attached to the back frame, the main member includes a framework having a loop shape and constituting an outer periphery and a body support part located in an inner side thereof, and the body support part is provided with a large number of slits or holes so as to have such a strength that deformation is easily caused by the body pressure of a seat occupant.
  • the matter specific to the fifth invention may be applied also to the third invention or the fourth invention.
  • the backrest may employ various configurations.
  • the main member is composed of an integrally molded article.
  • the body support part is provided at constant to the framework.
  • the body support part is constructed from a flexible raw material such as a mesh material and then the flexible raw material is attached to the framework.
  • the framework performs warp deformation in accordance with the body pressure of a seat occupant.
  • the backrest may be constructed from the main member alone and then the body pressure of the seat occupant may be received directly by the main member.
  • a cushion is arranged in the front face of the main member and then at least the cushion is covered by a skin material. In this configuration of the fifth invention, softness to the body can be ensured by the cushion.
  • the seventh invention also is an example of expansion of the fifth invention.
  • a lower end of the main member is located close to the seat surface, a lumbar support member for supporting the lumbar of a seat occupant is arranged on the front face or the rear face of the main member and, further, the main member is attached to the second support device at a position slightly higher than the lumbar support member.
  • the matter specific to the seventh invention may be applied also to the first to the fourth invention or the sixth invention.
  • the lumbar support member When the lumbar support member is provided like in the seventh invention, the lumbar of the seat occupant can appropriately be supported. Thus, this can contribute to maintaining of an appropriate attitude by the seat occupant. Then, since the first support device is attached to the main member on the lumbar support member, this can avoid a situation that the width in the right and left directions of the main member becomes excessively large. Further, since the attaching part of the second support device and the attaching part of the lumbar support member are close to each other, the rigidity of the portion of the attaching part of the lumbar support member within the main member can also be improved and hence this can contribute to the further stability of the body of the user.
  • the eighth invention is an example of expansion of the first invention or the second invention.
  • the backrest is inclined rearward.
  • the eighth invention is applied to a rocking chair.
  • the eighth invention may be applied also to the third to the seventh invention.
  • rocking chairs a configuration is widely employed that the seat is linked to the backrest.
  • the present invention may be applied also to such a chair of synchronous type.
  • Warp deformation in the backrest appears remarkably in a rocking state.
  • the effect of the present invention is utilized especially under the eighth invention.
  • a body support part on which a body pressure of a seat occupant acts is constructed from a plurality of areas divided into right and left with a certain amount of interval in between; each area is constructed from a large number of stays horizontally elongated in the right and left directions; the stays in adjacent areas are arranged in a manner of being deviated in the up and down directions; adjacent stays in adjacent areas are linked together by a linkage piece in an inclined attitude in front view; and thereby the inclined attitudes of linkage pieces adjacent in the up and down directions are opposite to each other.
  • each stay is in an attitude horizontally elongated in the right and left directions.
  • the body support part deforms such as to extend in the right and left directions alone.
  • the configuration excels in the stability of supporting the body. That is, the deformation in the body support part has directivity and hence a situation is avoided that the body support part excessively follows the movement of the body so as to be deformed.
  • the configuration excels in the stability of supporting the body.
  • the linkage pieces are in an inclined attitude.
  • the attitudes of the linkage pieces vary so that the angle formed by linkage pieces adjacent in the up and down directions becomes small, the interval of stays adjacent in the right and left directions becomes wide.
  • This realizes substantially the same state as a situation that the body support part has performed extensional deformation in the right and left directions.
  • a high cushioning property can be ensured.
  • each stay is deformed such as to be bent, twisted, or like.
  • the configuration excels also in the fit property to the body.
  • a group of stays are in a longitudinal orientation. That is, in the tenth invention: a body support part on which the body pressure of a seat occupant acts is constructed from a plurality of areas divided into up and down with a certain amount of interval in between; each area is constructed from a large number of stays elongated vertically; the stays in adjacent areas are arranged in a manner of being deviated in the right and left directions; adjacent stays in adjacent areas are linked together by a linkage piece in an inclined attitude in front view; and thereby the inclined attitudes of linkage pieces adjacent in the right and left directions are opposite to each other.
  • the body support part easily performs extensional deformation in the right and left directions. However, basically, the same effect as that of the ninth invention is obtained.
  • the eleventh invention is a preferable example of expansion of the first invention or the second invention.
  • the width of the linkage piece is smaller than the width of the stay in front view. According to this configuration, in a state that the supporting area for the body is enlarged so that the stability of supporting the body is improved, deformation in the linkage pieces is made easy so that the cushion can be improved.
  • the twelfth invention is a detailed example of the ninth invention.
  • bases of linkage pieces adjacent in the up and down or the right and left directions are close to each other so that the linkage pieces adjacent in the up and down or the right and left directions are formed in a V-shape configuration.
  • the bases of linkage pieces adjacent in the up and down or the right and left directions may be separate from each other. Nevertheless, in this case, the number of linkage pieces is reduced so that a possibility arises that the strength is degraded.
  • the linkage pieces are continuous to each other without a gap in between. Thus, the number of linkage pieces can be increased and hence the strength of the body support part also can be ensured.
  • the configuration includes: a center area located in a center in the right and left directions; and right and left side areas arranged on both right and left sides thereof, the center area being constructed from a group of center stays and the side area being constructed from side stays, wherein the group of linkage pieces for connecting together the group of center stays and the group of side stays is formed in a zigzag configuration.
  • the number of areas constructing the body support part can arbitrarily be set forth. Nevertheless, when an excessively large number of areas is employed, the number of linkage pieces also increases and hence a concern of excessively high flexibility is caused unless any means is taken. In contrast, like in the thirteenth invention, in a configuration constructed from one center area and two side areas, the stability of supporting the body and the cushioning property can be harmonized with each other in a satisfactory manner and hence this configuration is preferable.
  • the fourteenth invention is detailed and preferable implementation of the ninth invention.
  • the density of stays is high.
  • the lumbar of the seat occupant is appropriately supported and hence this configuration is useful in improvement of the stability of the body of the user.
  • different means from the fourteenth invention may be employed like the plate thickness of the stay is increased.
  • each stay has a plate-shape configuration in which a plate thickness in the frontward and rearward directions is smaller than a vertical width, then a rib elongated in the right and left directions is formed in a rear face of each stay, and then the rib also is connected integrally to the linkage piece.
  • this fifteenth invention in a state that each stay is made as thin as possible, necessary bending strength can be ensured.
  • this configuration is preferable for saving the material (the resin).
  • the rib and the linkage piece are connected to each other, smooth deformation can be realized with avoiding a situation that bending is concentrated on the end part portion of the stay. Another advantage is also obtained that stress concentration is prevented and hence durability is improved.
  • the configuration that a rib is provided in the rear face of the stay may be applied also to the tenth invention.
  • FIGS. 1A and 1B are diagrams showing an overall external appearance of a chair according to an embodiment.
  • FIG. 1A is a perspective view taken from the front and
  • FIG. 1B is a perspective view taken from the rear.
  • FIGS. 2A and 2B are diagrams showing an overall configuration of a chair.
  • FIG. 1A is a partly disassembled perspective view and
  • FIG. 1B is a side view.
  • FIGS. 3A and 3B are disassembled views of a main part.
  • FIG. 3A is a diagram in a state that a backrest is shifted in an ordinary attitude.
  • FIG. 3B is a diagram in a state that the backrest is horizontally rotated and disassembled.
  • FIGS. 4A to 4C are diagrams showing the relationship between a support device and a back frame.
  • FIG. 4A is a disassembled perspective view of a first support device and a back frame
  • FIG. 4B is a disassembled perspective view of a first support device, a second support device, and a backrest
  • FIG. 4C is a disassembled perspective view of a second support device and a backrest.
  • FIGS. 5A and 5B are disassembled views showing the relationship between a first support device and a backrest.
  • FIGS. 6A and 6B are disassembled views showing the relationship between a second support device and a backrest.
  • FIGS. 7A to 7C are explanation diagrams of a lumbar support member.
  • FIGS. 7A and 7B are disassembled perspective views and
  • FIG. 7C is a plan view of a backrest.
  • FIG. 8 is a front view of a backrest.
  • FIG. 9 is a perspective view of a backrest viewed from the front.
  • FIG. 10 is a perspective view of a backrest viewed from the rear.
  • FIG. 11 is a disassembled view used for describing the function.
  • a chair includes as main elements a leg device 1 , a seat 2 , and a backrest 3 .
  • the backrest 3 is attached to a back frame 4 arranged behind it.
  • the leg device 1 includes: a leg pillar 5 in a vertical attitude; and a center tube 6 for supporting this. Five branched arms extend in radial directions from the center tube 6 . Then, a caster is attached to the tip of each branched arm.
  • the leg pillar 5 is constructed from a gas cylinder of extendable type provided with an inner cylinder and an outer cylinder. As shown in FIG. 2B , a base 7 is attach to the upper end of the leg pillar 5 and then the back frame 4 is linked through a joint member 8 to the base 7 in a manner permitting rearward inclination.
  • the back frame 4 and the joint member 8 may be integrated together.
  • the inner cylinder and the outer cylinder constituting the leg pillar 5 are freely rotatable relatively.
  • the base 7 (and the seat 2 and the backrest 3 ) is freely rotatable horizontally.
  • a rocking spring for elastically supporting the rearward inclination of the back frame 4 is built in the base 7 .
  • an intermediate member (not shown) provided in the base 7 is attached in a manner permitting rearward inclination and rearward movement about the front part serving as a center.
  • the intermediate member and the joint member 8 are linked together in a manner permitting relative movement by a shaft horizontally elongated in the right and left directions.
  • the seat 2 performs rearward movement and rearward inclination in linkage with the rearward inclination of the backrest 3 .
  • the backrest 3 includes a main member fabricated from a raw material of resin such as polypropylene by injection molding.
  • the backrest 3 and the main member need be distinguished from each other.
  • the entirety of the backrest 3 is constructed from the main member and hence distinction of these does not provide a substantial advantage.
  • the term “main member” is not used and the term “backrest 3 ” is used.
  • the backrest 3 is constructed from a framework 9 constituting the outer periphery and a body support part 10 located in the inside.
  • the framework 9 is formed in a shape substantially close to a quadrangle by: a pair of side members 9 a constituting both right and left sides; an upper member 9 b horizontally elongated in the right and left directions and constituting the upper end part; and a lower member 9 c horizontally elongated in the right and left directions and constituting the lower end.
  • the lower end of the backrest 3 is located close to the seat surface.
  • a lumbar support member 11 for supporting the lumbar of a seat occupant is arranged in the front face at a height position corresponding to the lumbar of the seat occupant.
  • the body height and the preference depend on the individual seat occupant.
  • the lumbar support member 11 is in a height adjustable manner.
  • the backrest 3 of the present embodiment has such a constricted shape that the attaching part of the lumbar support member 11 is the narrowest.
  • employable configurations need not be limited to this. That is, as the configuration of the backrest 3 , an arbitrary shape may be employed like: a configuration that the width in the right and left directions is substantially fixed; the shape of an inverted trapezium in which the upper end is wide and the lower end is narrow; and the shape of an inverted trapezium in which the upper end is narrow and the lower end is wide.
  • the back frame 4 includes right and left vertically elongated members 4 a inclined such that the interval between these becomes close as going upward.
  • the upper ends are connected integrally through a linkage part 4 b.
  • the right and left vertically elongated members 4 a constitute a configuration of inverted V-shape.
  • the lower ends of the right and left vertically elongated members 4 a are connected integrally through a lower stay part 4 c.
  • a frontward arm part 4 d is provided integrally at the lower end of the right and left vertically elongated members 4 a.
  • the frontward arm part 4 d and the lower stay part 4 c are connected to the joint member 8 shown in FIG. 2A and 2B .
  • the vertically elongated member 4 a of the back frame 4 is formed in an L-shaped cross section having a back face plate and a side face plate.
  • a resin molded article or an aluminum die-cast article is employed. Instead, fabrication may be performed by employing a metal plate or a metallic pipe as the material.
  • a composite article constructed from materials of different kinds may be employed. Further, an integral construction is not unavoidable. That is, for example, the right and left vertically elongated members 4 a may be separately fabricated and then linked together at the upper ends, that is, may be constructed from a plurality of component parts.
  • a shell-structured article also may be employed as the back frame 4 .
  • the right-left middle part of the upper member 9 b is attached through a first support device 12 to the linkage part 4 b of the upper end of the back frame 4 .
  • the right and left side members 9 a are attached through second support devices 13 to the vertically elongated member 4 a of the back frame 4 . This point is described below in detail.
  • the first support device 12 includes two spring parts 12 a arranged in a V-shape in front view.
  • An upper attaching part 12 b horizontally elongated in the right and left directions is connected integrally to the upper ends of the spring parts 12 a.
  • a lower attaching part 12 c protruding rearward is connected integrally to the lower ends of the right and left spring plate parts 12 a.
  • the first support device 12 is fabricated from a raw material of resin such as polypropylene by injection molding.
  • the spring plate parts 12 a are in an attitude elongated in the up and down directions, however, has a plate shape which is wide in front view and narrow in side view. Thus, bending deformation can easily be caused by a force from the front.
  • the lower attaching part 12 c is formed in the shape of a block (the shape of a boss) horizontally elongated in the right and left directions.
  • a rear-side first recess 15 serving as a frontward aperture into which the lower attaching part 12 c is fitted is formed in the linkage part 4 b of the back frame 4 .
  • the lower attaching part 12 c is fixed with a first bolt 16 inserted into a rear-side first recess 15 from below.
  • a nut insertion hole 17 into which a nut for the first bolt 16 is set is opened rearward.
  • the upper member 9 b of the backrest 3 has a triple structure in the inside and outside having an outer wall, an inner wall 18 , and an intermediate wall 19 .
  • two elongated grooves 20 opened rearward are formed.
  • the right-left middle part of the inner wall 19 is, for example, cut off so that a front-side first recess 21 into which the upper attaching part 12 b of the first support device 12 is fitted is formed.
  • the upper attaching part 12 b of the first support device 12 is fixed to the upper member 9 b with a second bolt 22 inserted from below.
  • a nut holding part 23 opened rearward is formed in the upper member 9 b of the backrest 3 .
  • a stopper piece 24 for abutting against the nut holding part 23 of the upper member 9 b from the rear is provided such as to protrude upward.
  • the second support device 13 is fabricated from a raw material of resin such as nylon resin having a high rigidity. Then, as shown in FIGS. 5B and 5C , the second support device 13 includes an arm part 13 a having a band plate shape gradually bent into a wave shape in plan view. At the rear end of the arm part 13 a, a rear boss part 13 b is provided integrally. Then, at the front end of the arm part 13 a, a front boss part 13 c is provided integrally.
  • the arm part 13 a has such a rigidity that deformation is not easily caused by the body pressure of the sitting person (however, slight deformation may occur).
  • the rear boss part 13 b is fitted into the rear-side second recess 25 provided in the vertically elongated member 4 a of the back frame 4 .
  • a third bolt 26 is inserted into the rear-side second recess 25 from below.
  • a nut (not shown) into which the third bolt 26 is inserted is incorporated in the rear boss part 13 b of the second support device 13 .
  • a flange 13 d overlapping with the opening edge of the rear-side second recess 25 is provided in the rear boss part 13 b.
  • a front-side second recess 27 into which a front boss 13 c of the second support device 13 is fitted is formed in the side member 9 a of the backrest 3 .
  • the front-side second recess 27 has a substantially box-shaped external appearance and then a bolt hole 28 through which a bolt (not shown) is inserted is opened in the inner wall 27 a.
  • a nut attaching groove 29 is provided in the front boss part 13 c of the second support device 13 . Then, a bolt is inserted into the nut arranged in the nut attaching groove 29 .
  • a step part 30 for increasing the thickness of the portion of the bolt hole 28 so as to enhancing the strength is formed in an inner plate 25 a of the front-side second recess 27 .
  • a cut-off part 31 overlapping with the step part 30 of the front-side second recess 27 is formed in the front boss part 13 c of the second support device 13 .
  • a flange 13 e overlapping with the opening edge of the front-side second recess 27 is provided in the front boss part 13 c of the second support device 13 .
  • the lumbar support member 11 is composed of a molded article fabricated from a raw material of resin and formed from a raw material such as polypropylene having certain elasticity. Then, the lumbar support member 11 has a shape horizontally elongated in the right and left directions and crossing the backrest 3 . In plan view, the lumbar support member 11 is gradually curved concave frontward. Further, in vertical sectional side view, the lumbar support member 11 is slightly curved convex frontward.
  • Slide boss members 34 having a prism shape and protruding rearward are formed integrally at both right and left ends of the lumbar support member 11 .
  • the slide boss member 34 is fitted, in a freely slidable manner, into a guide frame part 35 elongated in the up and down directions provided in the side member 9 a of the backrest 3 .
  • the inner periphery of the guide frame part 35 is constructed from a plate part and then the front-side second recess 27 described above is connected integrally to the upper end of the guide frame part 35 .
  • a frontward protruding part 36 a having a block shape and provided in a knob 36 is fitted into the rear end of the slide boss member 34 .
  • the frontward protruding part 36 a of the knob 36 is fixed to the slide boss member 34 with a bolt (not shown).
  • a nut insertion groove 37 is provided in the slide boss member 34 .
  • the lumbar support member 11 can be held in a manner that the height is adjusted stepwise.
  • a large number of stopper holes 38 are provided at a large number of vertical stages in the inner plate of the guide frame part 35 .
  • a configuration is widely employed that a lumbar support member is provided in the backrest.
  • the lumbar support member is arranged on the back side of a cushion or on the back side of a mesh material.
  • the cushion or the mesh material intervenes between the lumbar support member and the body, in some cases, a person who desires a strong “feeling of abutting” feels unsatisfaction.
  • a lumbar support member need be arranged on the near side of the back plate.
  • JP-A-2008-237333 discloses an approach that in a configuration that a backrest is constructed from a frame part and a back plate located in the inner side thereof and then a large number of slits are provided in the back plate, a lumbar support member is arranged on the near side of the back plate. Further, this document discloses a configuration that handles of clip type fitted onto a frame part from the outer side are provided integrally in both right and left end parts of the lumbar support member and then the frame part is elastically held by the handles from below.
  • the handles run off to the right and left outer sides of the frame part and hence a trouble is expected that a person's clothes are caught in the handle or, alternatively, an object abuts against the handle so that the handle is damaged.
  • the handles maintain the height merely by friction and hence a possibility arises that the lumbar support member is slid such as to be raised or lowered by the body pressure of the seat occupant.
  • the slide bosses 34 provided in both right and left end parts of the lumbar support member 11 penetrate the guide frame parts 35 of the framework 9 .
  • the knobs 36 can be arranged such as not to run off the right and left outer sides of the framework 9 .
  • the lumbar support member 11 can be held at a desired height in a manner not permitting deviation movement.
  • the height adjusting means may employ various configurations.
  • the stopper holes 38 are provided in the guide frame part 35 like in the embodiment, it is sufficient that an elastic member fitted into and detached from the guide frame part 35 is provided in the block-shaped frontward protruding part of the knob 36 .
  • the guide frame part 35 has a certain amount of frontward and rearward width and hence strength degradation is not caused by the penetration of the slide boss member 34 .
  • the knob 36 may be fabricated in a simple plate shape and then may be screwed to the slide boss member 34 .
  • the body support part 10 includes: groups of horizontally elongated side stays 40 connected to the right and left side members 9 a; and a group of horizontally elongated center stays 41 located between the groups of side stays 40 . Both groups of stays 40 and 41 are arranged in a state of being deviated up and down.
  • the center area is constructed from the group of center stays 41 and the side areas are constructed from the groups of side stays 40 .
  • both right and left ends of the center stays 41 and the tips of the side stays 40 adjacent in the right and left directions are connected integrally with linkage pieces (joint stays) 42 .
  • the linkage pieces (the joint stays) 42 are in an inclined attitude in front view.
  • the center stays 41 and the side stays 40 are arranged in a manner of being deviated up and down and hence linkage pieces (joint stays) 42 adjacent in the up and down directions are in attitudes of opposite orientation.
  • the bases of linkage pieces (the joint stays) 42 and stays 40 and 41 adjacent in the up and down directions are connected integrally.
  • the groups of linkage pieces (joint stays) 42 have a zigzag shape in front view.
  • the backrest 3 is constricted such that the portion close to the lower side becomes narrow in front view.
  • a shape curved concave outward is formed.
  • the linkage pieces (the joint stays) 42 also are curved concave outward in front view such as to follow the shape of the side members 9 a.
  • the side member 9 a and the center stay 41 have substantially the same length in the right and left directions.
  • the side stay 40 and the center stay 41 have a plate-shaped structure whose front and rear faces are wide. However, as shown in FIG. 10 , a rib 43 is provided integrally in the rear faces of the side stay 40 and the center stay 41 .
  • the cross sections of the side stay 40 and the center stay 41 have a sideways T-shape.
  • the rear face of the rib 43 is in plane with the rear face of the linkage piece (the joint stay) 42 .
  • the linkage piece (the joint stay) 42 has an external appearance of a thin band plate and hence can easily be deformed such that the angle of the sideways V becomes wide or narrow. That is, in the lumbar support member 111 , the density of stays 140 and 141 is high. By virtue of this, the lumbar support part has a higher rigidity than the other parts.
  • the groups of side stays 40 and center stays 41 are arranged at a large number of vertical stages.
  • a space 44 horizontally elongated in the right and left directions is opened individually between side stays 40 and between center stays 41 adjacent in the up and down directions.
  • the vertical width dimension of the space 44 is twice or the like of the vertical width of the stay 40 or 41 .
  • the vertical width dimension of the space 44 is set substantially at the same level as the vertical width of the stay 40 or 41 .
  • the lumbar support part has a higher rigidity.
  • the vertical width and the pitch (the density) of the side stay 40 and the center stay 41 may be set up arbitrarily.
  • the vertical width dimension of the stay 40 or 41 and the space 44 may be set substantially at the same level over the entirety in the up and down directions.
  • the vertical width dimension of the stay 40 or 41 may be set smaller than the vertical width dimension of the space 44 over the entirety.
  • the body support part 10 has been constructed from two rows of the side stays 40 and one row of the center stays 41 .
  • employable configurations need not be limited to this. That is, the center stays 41 may be not provided and then the body support part 10 may be constructed from right and left side stays 40 and from one linkage piece (one joint stay) 42 for connecting these.
  • the body support part 10 may be constructed from two rows of the side stays 40 and two rows of intermediate stays located between them. In a case that two rows of the intermediate stays are provided, three linkage pieces (three joint stays) 42 are necessary.
  • the body support part 10 may be constructed from five rows of stay groups consisting of two rows of the side stays 40 , one row of the center stays 41 , and two rows of the intermediate stays.
  • the backrest 3 may employ other configurations.
  • the body pressure of a seat occupant in a rocking state acts on the backrest 3 from the front as indicated by an arrow F.
  • 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 perform bending deformation such that the upper end is moved rearward by the load from the front in side view.
  • the second support device 13 can perform bending deformation such that the tip is moved rearward in plan view.
  • the second support device 13 has a high rigidity, the back frame 4 of the backrest 3 is firmly held by the second support device 13 and hence the lumbar of the seat occupant is held with satisfactory stability.
  • the moment by rocking acts largely on the upper end part in the backrest 3 .
  • the first support device 12 has a lower rigidity than the second support device 13 and hence easily performs warp deformation in accordance with the body pressure.
  • the backrest 3 can perform warp deformation such that the upper end part thereof approaches the upper end part of the back frame 4 . This warp deformation of the backrest 3 can improve the cushioning property at the time of rocking.
  • the two right and left spring parts 12 a constituting the first support device 12 perform bending deformation unevenly so that the backrest 3 can be deformed and twisted such as to follow the twist or the shift of the body.
  • the backrest 3 can follow the change of the attitude of the body. As a result, comfort can be improved.
  • the backrest 3 is gradually curved concave frontward in plan view.
  • the degree of the curve is largest in the vicinity of the lumbar support member 11 and then the upper end part is in an almost flat state.
  • the shoulder or the portion close to the shoulder
  • high comfort can be obtained.
  • the backrest 3 in a neutral state that the seat occupant does not lean on the backrest 3 , the backrest 3 is slightly in a rearward inclined attitude and the lumbar support member 11 is located on the most front side. Then, when the user performs desk work such as PC operation, the user takes an attitude that the lumbar abuts against the lumbar support member 11 of the backrest 3 .
  • the second support device 13 since the second support device 13 has a high rigidity, the backrest 3 does not perform warp deformation in association with the body pressure of the seat occupant in a neutral state and hence the lumbar of the person is supported by the backrest 3 with satisfactory stability.
  • the upper half body of the user does not become unsteady and is held in a preferable attitude that the back is straightened.
  • the present configuration excels also in the attitude maintaining function in a neutral state (a non-rocking state).
  • the backrest 3 of the present embodiment can perform warp deformation such that the body support part 10 swells rearward in accordance with the body pressure of the seat occupant.
  • the present configuration excels in the fit property to the body of the user and excels also in the follow-up property for the movement of the body.
  • the present invention can provide a chair in which comfort in a leaning-on state is improved. Further, a chair can be provided in which the strength can be ensured, the time and effort in manufacturing can be saved, and variation in the quality can be prevented.
US14/896,236 2013-06-06 2014-06-06 Chair Abandoned US20160135603A1 (en)

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US14/896,236 US20160135603A1 (en) 2013-06-06 2014-06-06 Chair
PCT/JP2014/065094 WO2014196630A1 (fr) 2013-06-06 2014-06-06 Chaise

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JP6572266B2 (ja) 2019-09-04
WO2014196630A8 (fr) 2015-05-28
JP2017200599A (ja) 2017-11-09
WO2014196630A1 (fr) 2014-12-11
JP2018187443A (ja) 2018-11-29
JP2016073692A (ja) 2016-05-12
CN105263367A (zh) 2016-01-20

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