JP2014079519A - Lumbar support, and chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lumbar support and a chair capable of restraining an oppressive feeling caused by a point contact between a lumbar support body and a lumbar part when a seating person is seated and moderately supporting the lumbar part by enlarging the deformation tolerance of the lumbar support body.SOLUTION: A lumbar support 70 is used in a chair including a seating surface and a backrest erected on the seating surface. The lumbar support includes: an elastically deformable lumbar support body 71; a pair of side frame members 73 supporting a support part of the lumbar support body 71 on the right and left sides; and a fitting member 80 for supporting the side frame members 73 and fitting the side frame members 73 to the backrest. The lumbar support body 71 is provided with backward deformable free edges formed on the upper and lower sides.

Description

  The present invention relates to a lumbar support and a chair.

As is well known, a chair has various configurations based on having a leg, a seat provided on the upper part of the leg, and a back for supporting a seated person sitting on the seat. It has been known.
For example, in order to reduce fatigue of a seated person sitting for a long time, a technique is known in which a lumbar support is provided on a chair and the vicinity of the seated person's lumbar spine is supported.

  The lumbar support is required to appropriately support a predetermined position of the lumbar spine, and various techniques are disclosed in order to solve such a problem (for example, refer to Patent Documents 1 to 8).

  Each of these chairs has a structure in which a seating surface is formed by stretching a tension material on a rectangular frame member, and a lumbar support is disposed behind the tension material, such as urethane inside the tension material. Compared to a chair with a lumbar support on the back of a backrest that is made up of a cushioning material consisting of a cushioning material, the distance between the lumbar support and the waist is closer, and the support force (pressing force) by the lumbar support is reduced It is excellent in that it can directly act on the waist of the person.

US Pat. No. 6,588,842 Japanese Patent No. 4133067 JP 2007-190219 A US Pat. No. 7,344,194 JP 2012-010866 A International Publication No. 2006/094258 US Pat. No. 7,249,802 JP 2006-280416 A

  However, the techniques described in Patent Documents 1 to 5 described above are accommodated in the cushion material inside the tension material, and the lumbar supports described in Patent Documents 1, 2, and 5 are on the back side of the backrest. Since the center of the backrest is in contact with the seated person's back at the earliest timing, the frontmost part of the lumbar support is the center of the seated person's back in the lateral direction. In addition, since a small range is supported so as to make point contact, a sense of pressure may be given to the seated person.

  Moreover, although the technique of the said patent documents 6 and 7 has high followability with respect to a seated person's back movement, it cannot be said that a lumbar support deform | transforms enough and a comfortable seating comfort is not necessarily sufficient. It's hard to say that you can get it.

  Further, the technique described in Patent Document 8 is configured such that the lumbar support body is formed of a soft material such as an elastomer, and the upper and lower end portions are supported by the lumbar support mounting member so that a bending space is generated in the rear. Therefore, very high followability to the seated person's back is ensured.

  Thus, as a result of intensive research on the lumbar support that can support the lumbar spine moderately, the inventors have found that the lumbar support body according to the above-mentioned Patent Document 8 collapses in the plane direction along the back muscle of the seated person. Because it is easy to deform in the vertical direction, the deformation tolerance of the seated person's back in the left and right direction is improved and the lumbar support is prevented from making point contact, so that the lumbar spine can be reduced while reducing the feeling of pressure on the seated person The knowledge that it can support moderately was acquired.

  The present invention has been made in view of the above circumstances, and by increasing the lateral deformation tolerance of the lumbar support main body, the lumbar support main body makes point contact with the waist when a seated person is seated. It is an object of the present invention to provide a lumbar support and a chair capable of suppressing the occurrence of the problem and appropriately supporting the waist.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a lumbar support used in a chair provided with a seating surface and a backrest erected with respect to the seating surface, and extends in the left-right direction and forward in a side view. A lumbar support body that is bulged and elastically deformable, a pair of side frame members that support a support portion of the lumbar support body on the left and right sides, and supports the side frame member and the side frame member An attachment member attached to the backrest, and the lumbar support main body is characterized in that a free edge that can be deformed rearward is formed vertically.

  The invention according to claim 7 is a chair provided with a seating surface and a backrest, and a tension member is stretched on the back of the tension member, according to any one of claims 1 to 6. The lumbar support described is arranged.

According to the lumbar support and chair according to the present invention, the lumbar support main body is formed with the free edges that can be deformed rearward up and down. The center of the lumbar support body is deformed so as to be surrounded from both sides in the left-right direction over a wide range in the vertical direction.
As a result, when the seated person is seated, the lumbar support main body can be prevented from causing a feeling of pressure by making point contact with the waist, and the waist can be appropriately supported.

  Here, in the lumbar support body, the free edges that can be deformed rearward are formed vertically. That is, the free edges consisting of the full length or part of the left-right direction are formed above and below the lumbar support body. Meaning, the upper and lower free edges may be the same length or different lengths.

  Invention of Claim 2 is a lumbar support of Claim 1, Comprising: The said attachment member is extended in the left-right direction, The connection part which connects the said side frame member in the left-right direction, and the said connection part And an attachment part for attaching the side frame member to the backrest.

    According to the lumbar support according to the present invention, the mounting member includes the connecting portion that connects both the left and right side frame members, and the side frame member and the mounting member are integrally formed. Thus, the strength of the mounting portion is improved, and the lumbar support main body can be stably deformed rearward, and the deformation tolerance of the lumbar support main body can be improved.

  Invention of Claim 3 is a lumbar support of Claim 1 or Claim 2, Comprising: The said side frame member protrudes toward the edge part of the right-and-left both sides of the said lumbar support main body, The said lumbar support main body And a right and left side edge.

  According to the lumbar support according to the present invention, since the side frame member includes the protruding portions that lock the left and right side edges of the lumbar support main body, the lumbar support main body can be easily connected to and supported by the side frame member. Can do.

  A fourth aspect of the present invention is the lumbar support according to the third aspect, wherein a plurality of the projecting portions are formed on the side frame member corresponding to the left and right edge portions of the lumbar support main body. The portion enters and locks into the lumbar support main body.

  According to the lumbar support according to the present invention, the plurality of projecting portions are formed corresponding to the left and right edge portions of the lumbar support main body, and at least a part thereof enters and locks into the lumbar support main body. Can be connected with great strength, and as a result, the load applied to the lumbar support main body can be sufficiently supported.

  In this specification, when the protrusion enters the lumbar support body, the protrusion includes being inserted into a recess formed in the lumbar support body, fitted, and embedded by insert molding or the like. In the case where a gap is formed between the portion and the lumbar support body, the case where the gap is filled with a filler or the like is included.

  The invention according to claim 5 is the lumbar support according to claim 4, wherein the protruding portion that enters and locks into the lumbar support main body has a perforated lock having a through-hole closed at the periphery. A wall portion is provided, and a locked portion formed in the lumbar support main body and extending in the thickness direction of the lumbar support main body passes through the through hole.

  According to the lumbar support according to the present invention, the protruding portion that enters and locks into the lumbar support main body includes the perforated locking wall portion having the through hole with the peripheral edge closed, and the through hole has the inside of the lumbar support main body. Since the to-be-latched part formed in the direction extending in the thickness direction of the lumbar support main body penetrates, the lumbar support main body can be stably supported with high strength. Moreover, even if this locked part moves inside the hole, it is possible to suppress the lumbar support body from falling off the side frame member.

  Invention of Claim 6 is a lumbar support of any one of Claims 1-5, Comprising: The chair provided with the left-right paired vertical frame member formed along the up-down direction of the said backrest And a wing wall portion extending to the left and right of the mounting member and engaging with the vertical frame member.

According to the lumbar support according to the present invention, the lumbar support can be firmly supported by the vertical frame member by engaging the left and right vertical frame members with the blade wall portions extending to the left and right of the lumbar support main body. . Moreover, the strength of the lumbar support can be improved by connecting the side frame portion and the mounting member via the blade wall portion.
In addition, since the wing wall portion is configured to be slidable using the left and right vertical frame members as guides, the height adjustment of the lumbar support can be performed efficiently.

  According to the lumbar support and the chair according to the present invention, when a seated person is seated, the lumbar support main body can be prevented from causing a pressure sensation due to point contact with the waist, and the waist can be supported appropriately.

It is the perspective view which looked at the chair which concerns on 1st Embodiment of this invention from diagonally forward. It is the perspective view which looked at the upper part of the chair concerning a 1st embodiment of the present invention from back. BRIEF DESCRIPTION OF THE DRAWINGS It is a side view of the chair which concerns on 1st Embodiment of this invention, (a) is a side view which shows normal time, (b) is a figure which shows the state in which the seated person leaned back to backrest. It is the figure which looked at the chair concerning a 1st embodiment of the present invention from the front. In the chair which concerns on 1st Embodiment of this invention, it is a side view explaining the case where it uses in the state which supported the seated person's waist | lumbar part by the lumbar support. BRIEF DESCRIPTION OF THE DRAWINGS (a) It is the perspective view which looked at normal time from the upper direction of the chair which concerns on one Embodiment of this invention, (b) The perspective view which looked at the case where it took the attitude | position which turned around from the width direction one side to the back FIG. It is a figure which shows the PP cross section in FIG. 4 of the state which the seated person has not seated regarding the chair which concerns on 1st Embodiment of this invention. It is a figure which shows the PP cross section in FIG. 4 of the state which the seated person seated regarding the chair which concerns on 1st Embodiment of this invention, (a) is a figure which shows the state where the seated person faced the front. FIG. 6B is a diagram showing a state in which a seated person is drowning in a backrest by twisting the upper part of the back to the right side. It is a figure which shows the lumbar support which concerns on 1st Embodiment of this invention, (a) is a top view, (b) is the figure seen from the front. It is a figure which shows the QQ cross section in FIG.9 (b) of the chair which concerns on 1st Embodiment of this invention, (a) was formed with the clearance gap between the edge part of the lumbar support main body, and the side frame member. (B) is a figure which shows the form which concerns on the modification which the edge of a lumbar support main body and a side frame member contact | abut. It is a figure which shows schematic structure of the lumbar support which concerns on 1st Embodiment of this invention, (a) is the perspective view seen from diagonally forward, (b) is the perspective view seen from diagonally back. It is a figure explaining schematic structure of a lumbar support concerning a 1st embodiment of the present invention, and is a perspective view which looked at a constituent member of a lumbar support from diagonally forward. It is a figure explaining schematic structure of a lumbar support concerning a 1st embodiment of the present invention, and is a perspective view which looked at a member of a lumbar support from diagonally back. It is a figure explaining the positioning block which comprises the lumbar support which concerns on 1st Embodiment of this invention, (a) is the perspective view seen from diagonally forward, (b) is the perspective view seen from diagonally back. is there. It is a figure explaining the attachment block which comprises the lumbar support which concerns on 1st Embodiment of this invention, (a) is the perspective view seen from diagonally forward, (b) is the perspective view seen from diagonally back. . FIG. 2 is a perspective view illustrating a schematic configuration of a lumbar support and a backrest according to the first embodiment of the present invention, in which (a) is a state before the lumbar support is connected to the backrest, and (b) is a back view of the lumbar support. It is a figure which shows the state connected with drowning. It is a figure explaining the principal part detail of the lumbar support and backrest which concerns on 1st Embodiment of this invention, and is the fragmentary sectional view which looked at the cross section containing a height adjustment mechanism from the side surface. It is a figure explaining the principal part detail of the lumbar support and backrest which concerns on 1st Embodiment of this invention, and is the fragmentary sectional view which looked at the center cross section from the side surface. It is a figure explaining the principal part detail of the lumbar support and backrest which concerns on 1st Embodiment of this invention, and is a cross-sectional view in the RR cross section in FIG. It is the perspective view which looked at the lumbar support which concerns on 2nd Embodiment of this invention from diagonally forward.

(First embodiment)
Hereinafter, a chair according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a chair 1 according to this embodiment includes a leg body 10 provided on a floor surface F, a backrest support body 20 supported by the leg body 10, and the backrest support body 20. And a backrest support member 40 supported by the backrest support 20, and a backrest supported by the backrest support member 40 and supporting the back of the seated person. 50 and a lumbar support (body support member) 70 connected to the front of the back support member 40 and supporting the waist of the seated person.

  Details of each component will be described below. In the following description, the direction in which the occupant sits and leaves is the front-rear direction, the side on which the occupant is seated is the front, the opposite side is the rear, and the direction in the horizontal plane perpendicular to the front-rear direction is the width direction. And the side away from the chair in the width direction is the side.

(Leg)
The leg body 10 includes a plurality of leg rods 12 provided with casters 11 capable of turning on the floor surface F, and leg columns 13 supported by the plurality of leg rods 12. The plurality of leg rods 12 are radially arranged and connected to each other at the base ends, and casters 11 are attached to the respective tips. The lower part of the pedestal 13 is connected to the base ends of the plurality of leg rods 12 and is erected upward. Further, a support base 14 having a built-in reclining mechanism (not shown) that allows the back support member 40 to be tilted backward through the back support 20 is attached to the upper portion of the pedestal 13.

(Backrest support)
The backrest support 20 includes a pair of forward arm portions 21 whose base portions are pivotally attached to both sides in the width direction of the support base 14, and a seat portion that extends upward from the base portion of the forward arm portion 21. A pair of upward arm portions 22 that support 30 and a pair of backward arm portions 23 that extend rearward from the base portion of the forward arm portion 21.

  As shown in FIG. 2, the pair of rearward arm portions 23 are arranged so as to gradually approach each other toward the rear and are connected to each other at the rear end so that they are integrally arranged in a downward V-shape. Has been. The rear ends of the pair of rearward arm portions 23 are fixed to the lower portion of a backrest support member 40 described later.

  Moreover, as shown in FIG. 1, the backrest support body 20 is provided with an armrest 26 that extends upward from the side.

(Seat)
As shown in FIG. 3, the seat portion 30 is supported at the front portion so as to be slidable in the front-rear direction with respect to the support base 14, and is pivotally attached to the upward arm portion 22 of the backrest support body 20. As the backrest support 20 is tilted backward by the reclining mechanism of the support base 14, the seat portion 30 moves rearward relative to the support base 14 and tilts the rear side downward. It is configured.

(Back support member)
As shown in FIG. 2, the backrest rear support member 40 includes a lower connecting portion 41 connected to the backrest support 20, a deformation allowing portion 42 extending upward from the lower connecting portion 41, and the deformation allowing And an upper connecting portion 43 arranged so as to gradually spread outward in the width direction from the upper end of the portion 42 upward.

  The lower connecting portion 41 is formed with a recess (not shown) in which the rear ends of the pair of rear arm portions 23 of the back support 20 are fitted on the lower rear surface. Is fitted. And the lower connection part 41 is fixed to the upper part of the backrest support body 20 by this recessed part, for example by screwing by a volt | bolt nut (not shown). Further, the lower connecting portion 41 is connected to the backrest 50 at the lower end.

  As shown in FIGS. 1 and 4, the deformation allowing portion 42 has a lower end connected to the lower connecting portion 41 and arranged upward, and an upper end connected to the upper connecting portion 43. Further, the deformation allowing portion 42 is formed such that the length dimension in the width direction gradually becomes narrower as it goes upward, and the length dimension in the width direction becomes wider again as it goes from the middle to the upper side.

  The deformation allowing portion 42 is formed to bulge rearward so that the front surface is concave and the rear surface is convex. The deformation allowing portion 42 has a plurality of lateral ribs 42A projecting forward and extending in a substantially horizontal direction at intervals in the vertical direction on the concave front surface and projecting forward. A plurality of vertical ribs 42 </ b> B extending substantially in the vertical direction are formed at intervals in the width direction of the chair 1.

  In the present embodiment, three lateral ribs 42A and engagement ribs 40A that are disposed on the lower side of the lateral ribs 42A and engage with the lumbar support 70 are formed, and intersect with the lateral ribs 42A and the engagement ribs 40A. Two vertical ribs 42B are formed. In the deformation | transformation permission part 42, in addition to being formed in the substantially circular arc shape where a horizontal cross section bulges back, the rigidity is improved by these horizontal rib 42A and vertical rib 42B.

  The upper connecting portion 43 is arranged so that the lower end is connected to the deformation allowing portion 42 and gradually spreads outward in the width direction as it goes upward. In the present embodiment, the upper connecting portion 43 has a pair of connecting pieces 43A and 43B that are gradually spaced apart from each other in the width direction as it goes upward, and the entire connecting portion 43A and 43B is used as a whole. It is formed in a V shape.

  As shown in FIG. 5, the pair of connecting pieces 43A and 43B constituting the lower connecting portion 41, the deformation allowing portion 42, and the upper connecting portion 43 are integrally formed, and the backrest supporting member 40 is formed as a whole. As seen from the side, it is formed so as to bulge backward. In FIG. 5, a solid line indicates a state where the seated person is drowned, and a two-dot chain line indicates a state where the seated person is not drowning.

  That is, the lower connecting portion 41 is curved so as to go backward as it goes upward as a whole. Further, the pair of connecting pieces 43A and 43B constituting the upper connecting portion 43 are inclined so as to go forward as they go upward while being curved. And the deformation | transformation permission part 42 has connected the upper connection part 43 and the lower connection part 41, curving.

(Backrest)
As shown in FIG. 2, the backrest 50 includes a tension member 51 that receives the back of the seated person, and an upper frame portion 52 to which the tension member 51 is attached and connected to the upper connection portion 43 in the backrest support member 40. And a pair of vertical frame portions 53A and 53B (53) which are connected to the upper frame portion 52 and to which the upholstery material 51 is attached.

  The upholstery material 51 is composed of a flexible member that receives the back of the seated person and can be deformed according to the posture of the back. Specifically, in the present embodiment, it is formed of a mesh-like material, and the entire thread material constituting the mesh elastically expands and contracts, so that it can be flexibly deformed as a whole. The upholstery material 51 is provided in a portion surrounded by the upper frame portion 52 and the pair of vertical frame portions 53, and ends thereof are fixed to the upper frame portion 52 and the pair of vertical frame portions 53.

  The upper frame portion 52 extends along the width direction, and both ends thereof are respectively connected to the upper ends of the pair of connection pieces 43A and 43B in the upper connection portion 43, and the upper ends of the pair of vertical frame portions 53A and 53B. Respectively.

  One vertical frame portion 53 </ b> A includes a lower member 57 </ b> A and an upper member 56 </ b> A that is connected to the upper end of the lower member 57 </ b> A and can be elastically deformed by a force acting from the tension member 51. Similarly, the other vertical frame portion 53B has a lower member 57B and an upper member 56B that is connected to the upper end of the lower member 57B and can be elastically deformed by a force acting from the tension member 51.

  As shown in FIGS. 2 and 5, the lower members 57A and 57B are connected at the lower ends to the lower connecting portion 41 of the back support member 40, and gradually extend forward and outward in the width direction. It is formed to open. Each of the lower members 57A and 57B is formed so that the cross-sectional dimension decreases as it goes upward.

  The upper members 56A and 56B are configured to be elastically torsionally deformable and elastically bendable and deformable according to a load acting from the back of the seated person.

  The upper members 56A and 56B have lower ends connected to the corresponding lower members 57A and 57B, and upper ends connected to the pair of connecting pieces 43A and 43B of the upper frame portion 52 and the backrest support member 40, and head upward. Accordingly, the lower members 57A and 57B are formed so as to be inclined rearward relative to the lower members 57A and 57B.

  In this embodiment, the upper members 56A and 56B are formed so as to be gradually inclined rearward from the upper ends of the lower members 57A and 57B upward.

  As described above, the vertical frame portions 53A and 53B are formed so as to gradually move forward from the lower portion 57A and 57B toward the upper side from the lower portion, and between the lower members 57A and 57B and the upper members 56A and 56B. The upper portions 56A and 56B are formed so as to gradually move forward from the connecting portion toward the upper side, and the vertical frame portions 53A and 53B are curved so as to be convex toward the front as a whole. .

  As shown in FIG. 2, the backrest rear support member 40 and the vertical frame portion 53 are integrally formed in an annular shape when viewed from the side. In this embodiment, the lower connecting portion 41, the deformation allowing portion 42, the one connecting piece 43A of the backrest support member 40, the upper member 56A and the lower member 57A of the one vertical frame portion 53A are annular in a side view. A first annular portion 61 is configured.

  Further, the second connecting portion 41, the deformation allowing portion 42, the other connecting piece 43B, the upper member 56B and the lower member 57B of the other vertical frame portion 53B of the backrest supporting member 40, which are annular in a side view, are viewed from the side. An annular portion 62 is configured.

  The first annular portion 61 and the second annular portion 62 are connected by the lower connecting portion 41 and the deformation allowing portion 42 and are integrally formed as a whole. The upper frame portion 52 is also integrally formed so that the upper ends of the first annular portion 61 and the second annular portion 62 are connected.

  That is, in this embodiment, each part of the backrest rear support member 40, the upper frame part 52 of the backrest 50, and the pair of vertical frame parts 53A and 53B are integrally formed.

  Further, as shown in FIG. 7, the vertical frame portions 53A and 53B are formed with cut portions 54A and 54B from the outer side in the width direction toward the inner side, and the end portions in the width direction of the tension member 51 are formed in the cut portions 54A and 54B. The part is sandwiched and fixed.

(Lumbar support)
As shown in FIGS. 3A and 7, the lumbar support 70 is connected to the front side of the back support member 40 on the rear side of the upholstery material 51 constituting the backrest 50, and the backrest is viewed from the side. In this embodiment, a gap is formed between the lumber 51 and the upholstery material 51 so that the lumber support 70 and the upholstery material 51 do not come into contact with each other.

  9 and 11, the lumbar support 70 is attached to, for example, a lumbar support main body (support member) 71, a pair of left and right side frame members (face material support members) 73A and 73B (73), The lumbar support body 71 includes a member 80 and a connecting member 90, and the lumbar support main body 71 is connected to the side frame members 73A and 73B (73) at support portions positioned on the left and right edges 71A and 71B.

  Further, the lumbar support 70 holds the side frame members 73 </ b> A and 73 </ b> B (73) by the attachment member 80 and is connected to the backrest support member 40 via the connection member 90 attached to the attachment member 80. ing.

  In addition, the lumbar support 70 is configured such that the back of the upper edge and the lower edge of the lumbar support main body 71 is formed with a backrest 50. Specifically, the upper and lower edges of the lumbar support main body 71 are formed as free edges by forming gaps 70H and 70J between the mounting member 80 and the left edge 71A and the right edge 71B. In the meantime, the entire vertical direction of the lumbar support main body 71 is easily deformed backward.

  As shown in FIGS. 11 to 13, the lumbar support main body 71 is made of an elastically deformable soft material such as translucent urethane resin or elastomer, and extends in the left-right direction of the backrest 50. It is an existing sheet-like face material. Further, the projecting portions 75 formed on the side frame members 73A and 73B (73) are entered from the end surfaces of the left and right edge portions 71A and 71B, and are attached to the side frame member 73. Is formed so as to bulge forward.

  The side frame member 73 includes a pair of left and right side frame member main bodies 74A and 74B (74) to which a lumbar support main body 71 is attached and a support-shaped portion that bulges forward of the backrest 50 when viewed from the side. Projecting portions 75 projecting from the side frame member main bodies 74A and 74B and extending toward the left and right edge portions 71A and 71B of the lumbar support main body 71, and insertion portions 77A and 77B (77).

  In this embodiment, a plurality of projecting portions 75 are formed along the support shape portions formed on the side frame member main bodies 74A and 74B (74) to lock the left and right edge portions 71A and 71B of the lumbar support main body 71. It is like that. With such a configuration, the lumbar support main body 71 bulges forward.

  The protrusion 75 is made of an elastically deformable material. For example, as shown in FIGS. 12 and 13, a plurality of tongue-like protrusions 75A protruding from the side frame member main bodies 74A and 74B (74), A plurality of perforated locks comprising a perforated locking wall portion that surrounds every other tongue-like protruding portion 75A and has a through-hole 76U defined between the tongue-like protruding portions 75A. The wall portion 75B is provided, and the gap between adjacent perforated locking wall portions 75B is formed between the adjacent tongue-like projecting portions 75A that are not surrounded by the perforated locking wall portion 75B. It is separated by the insert 76Y.

For example, when the lumbar support main body 71 is formed, the protrusion 75 is formed so as to enter the lumbar support main body 71 from the end surfaces of the edge portions 71A and 71B of the lumbar support main body 71 by insert molding.
And during insert molding, as shown in FIGS. 10 (a) and 10 (b), a wall portion (locked) formed integrally in the thickness direction of the protruding portion 75 through the through hole 76U in the lumbar support main body 71. Part) 71G supports the lumbar support main body 71.

  The insertion portions 77A and 77B (77) are formed to bend and extend inward in the left-right direction from the rear side end portions of the side frame member main bodies 74A and 74B (74), and are connected to the mounting member 80. It has a fitting engagement part.

Further, as shown in FIG. 10A, gaps G are formed between the end surfaces of the left and right edges 71A and 71B of the lumbar support main body 71 and the side frame member main bodies 74A and 74B (74). The lumbar support main body 71 is connected by the protruding portion 75.
As shown in FIG. 10B, the end portions of the lumbar support main body 71 are not formed between the end surfaces of the edge portions 71A and 71B and the side frame member main bodies 74A and 74B (74). It is good also as a structure which contacts.

  The attachment member 80 extends in the left-right direction and connects the left and right side frame members 73A and 73B (73), and is connected at the center in the left-right direction of the connection portion 81 and extends in the up-down direction. And an attachment portion 85 attached to the back support member 40 via the backrest 90.

  The connecting portion 81 has side frame member holding portions 82A and 82B (82) at both left and right end portions, and the side frame is fitted by inserting the insertion portion 77 of the side frame member 73 into the side frame member holding portion 82. The member 73 is configured to be held.

  In addition, the attachment portion 85 is formed with a connecting member attachment hole 85H penetrating in the front-rear direction and extending in the up-down direction, and a wave-like shape portion that repeatedly curves unevenly in the front-rear direction on both left and right peripheral edges of the connection member attachment hole 85H. 85A is formed.

  As shown in FIGS. 9 and 11, the upper edge side of the lumbar support main body 71 is the left and right side frames in a state in which the side frame member 73 is integrated with the attachment member 80 fitted in the holding side frame member holding portion 82. It is connected to the attachment member 80 via the members 73A and 73B (73), and a gap 70H is formed between the side frame member 73A and the side frame member 73B in the left-right direction of the upper edge of the lumbar support main body 71. ing.

  On the other hand, the lower edge side of the lumbar support main body 71 is supported in a cantilever manner via the side frame member main bodies 74A and 74B (74) with respect to the connecting portion 81 of the mounting member 80. A gap 80J is formed between the side frame members 73A and 73B (73) and the mounting member 80.

The connecting member 90 includes a positioning block 91, a mounting block 95, and a fixing screw 90P. The connecting member 90 connects the lumbar support 70 to the backrest support member 40, and increases the vertical height of the lumbar support 70. Adjustable.
The positioning block 91 and the mounting block 95 are mounted so as to sandwich the mounting member 80 from the front and rear, and are fixed by a fixing screw 90P.

  As shown in FIG. 14, the positioning block 91 is formed on the positioning block main body 92 with a convex portion 92 </ b> S projecting from the center in the left and right direction in the cross section perpendicular to the longitudinal direction (vertical direction) and extending in the longitudinal direction. The two screw mounting holes 92H into which the fixing screw 90P is screwed are formed at intervals in the longitudinal direction.

  The positioning block main body 92 has elongated holes 92B formed in the vicinity of the left and right edges, and elastic deformation portions 92C are formed outward in the width direction of the elongated holes 92B. Is formed rearwardly in the center in the longitudinal direction, and a positioning convex portion 93 that engages with the wave-shaped portion 85A of the mounting member 80 is formed. The wavy shape portion 85A and the positioning convex portion 93 constitute a height adjusting mechanism that is positioned stepwise by sliding the lumbar support 70 in the vertical direction.

  According to this height adjustment mechanism, as shown in FIG. 18, when the lumbar support 70 is moved in the vertical direction along the arrow, the positioning convex portion 93 is engaged with the concave portion of the wavy shape portion 85A. It is locked so that the height can be adjusted.

As shown in FIG. 15, the mounting block 95 has a convex part 96 </ b> S that protrudes from the mounting block main body 96 in the cross section perpendicular to the longitudinal direction and protrudes in the front left and right direction and extends in the longitudinal direction. Two through holes 96H for passing 90P are formed at intervals in the longitudinal direction.
Further, the convex portion 96S is configured to ensure the positional accuracy of the positioning block 91 and the mounting block 95 in the thickness direction by contacting the convex portion 92S of the positioning block 91.

  In addition, a first engagement wall portion 97 that protrudes rearward from the attachment block main body 96 and forms a first engagement portion is formed on the lower side in the vertical direction of the attachment block main body 96, and the first engagement wall portion 97 is formed. A first engaging convex piece 97A that protrudes downward (opposite to the second engaging portion) is formed at the tip of the first engaging portion 97U, and a substantially U-shaped first engaging shape portion 97U that opens downward. have.

  Further, the tip end of the first engaging convex piece 97 </ b> A is located above the lower end of the mounting block main body 96. That is, the lower end of the mounting block main body 96 is formed longer on the lower side than the tip of the first engaging convex piece 97A.

  Further, on the upper side (second position) of the mounting block main body 96 in the longitudinal direction, a second engaging wall portion 98 projecting rearward from the mounting block main body 96 constituting the second engaging portion, and a channel-shaped wall portion. 99 is formed, and a concave portion 98U is formed above the second engagement wall portion 98 (on the side opposite to the first engagement portion). Further, a release hole 96J for elastically deforming the second engagement wall portion 98 from the outside is formed on the upper side of the second engagement wall portion 98.

  Further, the channel-shaped wall portion 99 opens upward in the longitudinal direction lower side (first engagement wall portion 97 side) of the mounting block main body 96 with respect to the second engagement wall portion 98 as viewed from the rear side. The guide wall portions 99A and 99B are formed in a channel shape and disposed on the left and right sides of the second engagement wall portion 98, and the lower guide wall portions 99C are disposed below the second engagement wall portion 98. Yes.

  The lumbar support 70 provided with the connecting member 90 having the above-described configuration can be easily connected to the backrest support member 40 as shown in FIG. Therefore, the lumbar support 70 can be easily attached and detached between the backrest 50 of the backrest 50 and the backrest support member 40.

  As shown in FIGS. 17-19, the 1st to-be-engaged wall part 97 is below the engagement hole 40H formed in the position corresponding to the 1st engagement wall part 97 in the backrest rear part supporting member 40. As shown in FIG. It is composed of the end portion 40F of the back support member 40 that is positioned, and the engagement convex piece 97A formed on the first engagement wall portion 97 is inserted into the engagement hole 40H, so that the first engagement shape portion 97U is end. By making contact with the portion 40F, the first engaging portion and the first engaged portion are engaged. At this time, between the first engaging portion and the second engaging portion, the lumbar support 70 and the backrest support member 40 are brought into contact with each other on the opposing surfaces 96C and 40C.

  The second engaged wall 98 includes an engaging rib 40A formed on the back support member 40 and projecting forward, and an upper side of the second engaged wall 98 (second engaging wall 98, the second engaging wall portion 98 is elastically deformed downward, and the engaging rib is positioned so that the surface of the engaging rib 40A on the opposite side of the first engaging portion 98 faces the lower surface of the engaging rib 40A. The second engaging portion and the second engaged portion are engaged by inserting the convex portion 40B protruding downward from the middle of 40A into the concave portion 98U.

  The second engaged portion includes the second engaging wall portion 98 and the lower guide wall portion 99C of the channel-shaped wall portion 99, together with the engaging rib 40A and the vertical rib 42B, below the engaging rib 40A. An accommodating wall portion 40E protruding in an arc shape is formed on the upper side to be accommodated, and the second engaging wall portion 98 and the lower guide wall portion 99C of the channel-shaped wall portion 99 are engaged ribs 40A, vertical ribs 42B, The lumbar support 70 is securely connected to the backrest support member 40 by being formed in the housing recess defined by the housing wall 40E.

  The first engaging wall portion 97 constituting the first engaging portion is engaged with the first engaged portion formed on the backrest support member 40, and the first engaging wall portion 97 is connected to the end portion 40F. The second engaging portion side of the connecting member 90 is rotated rearward in the engaged state, and the second engaging wall portion 98 constituting the second engaging portion is rotated toward the engaging rib 40A. At the same time, the second engaging wall portion 98 is elastically deformed by the engaging rib 40A, and the second engaging wall portion 98 is engaged with the second engaged portion formed on the back support member 40. The lumbar support 70 is connected to the back support member 40 on the backrest. In addition, the first engagement wall portion 97 and the second engagement wall portion 98 are engaged with the first engaged portion and the second engaged portion, and the first engagement wall portion 97 is in the second engagement state. The second engaging wall portion 98 is supported on the first engaging portion side on the mating portion side.

  Since the lumbar support 70 is firmly supported by the backrest support member 40, even when the left and right vertical frame portions 53A and 53B (53) are deformed, it is less likely to be deformed than the vertical frame portion 53, and as a result. Since a large force is required for elastic deformation, the waist of the seated person can be firmly supported even if the seated person is drowning.

  Next, with reference to FIGS. 3, 5, 6, 7, and 8, an operation when a seated person sits on the seat portion 30 of the chair 1 and leans on the backrest 50 will be described.

  FIGS. 3A and 7 show the chair 1 in a state where a seated person is seated on the seat portion 30 and is not leaning on the backrest 50, and FIGS. 5, 6A, and 8A are seated. This shows a state where the person is leaning on the backrest 50.

  When the seated person leans on the backrest 50, a force from the seated person acts on the tension material 51 of the backrest 50, and the thread material constituting the mesh of the tension material 51 elastically expands and contracts by this force. As a whole, along the back of the seated person, it is elastically deformed into an arc shape so that the substantially central portion in the width direction protrudes rearward.

  Further, the vertical frame portions 53A and 53B to which the upholstery material 51 is fixed are elastically deformed so that the inner side in the width direction is directed rearward by the force applied from the upholstery material 51, and inward in the width direction so as to be close to each other. Moving.

  On the other hand, the pair of vertical frame portions 53A and 53B connected to both ends in the width direction of the upper frame portion 52 are elastically deformed by the force acting from the upholstery material 51, and therefore follow the back of the seated person according to the load of the seated person. The lumbar support 70 supports the occupant's lower back while elastically deforming rearward while receiving the back so as to be wrapped together with the upholstery material 51. For this reason, the seated person can be seated in a stable state.

  Since the lumbar support 70 is firmly supported by the backrest support member 40, even when the left and right vertical frame portions 53A and 53B (53) are deformed, it is less likely to be deformed than the vertical frame portion 53, and as a result. Since a large force is required for elastic deformation, the waist of the seated person can be firmly supported even if the seated person is drowning.

  Further, since the upper members 56A and 56B constituting the vertical frame portions 53A and 53B are elastically deformed by the force applied from the upholstery material 51, the upper members 56A and 56B are deformed so as to follow the back of the seated person according to the load of the seated person. The back can be received so as to be wrapped together with the upholstery material 51.

  In addition, when the seated person takes a posture of turning back from one side in the width direction of the backrest 50 as shown in FIG. 6 (b), as shown in FIG. 8 (b) The load from the person acts on one side in the width direction of the backrest 50, and a load that twists and deforms the vertical frame portion 53B acts on the vertical frame portion 53B on the biased side.

  Here, the upper member 56 </ b> B in the vertical frame portion 53 </ b> B is configured to be torsionally deformed by a force acting from the backrest 50. In addition, since the connecting pieces 43A and 43B are formed so as to be narrowed so that the connecting pieces 43A and 43B move downward, and are joined to each other and connected to the deformation allowing portion 42, the deformation allowing portion 42 promotes torsional deformation of the upper member 56B. It is configured. Accordingly, the upper member 56B is twisted and deformed toward the rear side so as to follow the back of the seated person according to the load of the seated person.

Further, since the connecting piece 43B connected to the upper member 56B is configured to be displaceable with the twist of the upper member 56B, the connecting piece 43B is moved to the rear side with the twist toward the rear side of the vertical frame portion 53B. Displace.
The upholstery material 51 in the backrest 50 is elastically deformed so as to wrap around the back of the seated person by elastically expanding and contracting the thread material constituting the mesh of the upholstered material 51 by a load from the seated person.

  Further, in the lumbar support 70, when the occupant falls, the upper and lower free edges of the lumbar support main body 71 are deformed rearward and the gaps 70H and 70G are reduced. And since the clearance gaps 70H and 70G become small, the lumbar support main body 71 deform | transforms so that a seated person may be wrapped from the left-right direction over the whole area of an up-down direction.

  According to the lumbar support 70 and the chair 1 according to the first embodiment, when the seated person is seated, the lumbar support main body 71 is prevented from causing a feeling of pressure on the waist and appropriately supports the waist. Can do.

Further, according to the lumbar support 70 and the chair 1, the deformable free edges are formed at the upper and lower sides of the lumbar support main body 71, so that the deformation tolerance of the lumbar support main body 71 increases, The lumbar support main body 71 is deformed so as to surround the center from both sides in the left-right direction over a wide range in the vertical direction.
As a result, when the seated person is seated, the lumbar support main body 71 is prevented from making point contact with the waist.

  Further, according to the lumbar support 70 and the chair 1, the mounting member includes a connecting portion that connects both the left and right side frame members, and the side frame member and the mounting member are integrally formed. The strength of the frame portion and the mounting portion is improved, and the lumbar support body can be stably deformed rearward, and the deformation tolerance of the lumbar support body can be improved.

  The lumbar support main body 71 is provided so that the tension member 51 can come into contact with the lumbar support main body 71 before the side frame member 73 when a seated person sits and the tension member 51 is deformed rearward. The curvature of 51 may be made larger than that of the lumbar support main body 71, or the lumbar support main body 71 may be configured to bulge forward than the amount by which the upholstery material 51 bulges backward.

  Further, according to the lumbar support 70 and the chair 1, since the side frame member includes the protruding portions that engage the left and right side edges of the lumbar support main body, the lumbar support main body can be easily connected to and supported by the side frame member. can do.

  Further, according to the lumbar support 70 and the chair 1, a plurality of protruding portions 75 are formed along the support shape portion on the support member main body 74 in correspondence with the left and right edge portions 71A and 71B of the lumbar support main body 71. Since the lumbar support main body 71 is entered and locked, the lumbar support main body 71 can be connected with high strength, and as a result, the load applied to the lumbar support main body 71 can be sufficiently supported.

  Further, according to the lumbar support 170, the protruding portion 71B that enters and locks into the lumbar support main body 71 includes the perforated locking wall portion 75B having the through-hole 76U whose peripheral edge is closed, and is formed in the through-hole 76U. Since the wall portion 71G formed in the lumbar support main body 71 and extending in the thickness direction passes therethrough, the lumbar support main body 71 can be stably supported with high strength. Even if the wall portion 71G moves inward of the through hole 76U, the lumbar support main body 71 can be prevented from falling off the side frame member 73.

  Further, according to the lumbar support 70, the protruding portion 75 can be elastically deformed in the surface direction of the lumbar support main body 71, and the support portion to which the lumbar support main body 71 and the side frame member 73 are connected is prevented from becoming too hard. Therefore, the elastic deformation tolerance in the support portion of the lumbar support main body 71 is increased, and sufficient elastic deformation tolerance can be ensured over a large range of the body support surface of the lumbar support main body 71.

  Further, since the lumbar support main body 71 is formed of an elastically deformable soft material such as an elastomer, the lumbar support main body 71 itself can secure a large elastic deformation tolerance, and the body support surface has sufficient flexibility. Can be secured.

  Further, according to the lumbar support 70, it is easy to obtain a large elastic deformation in the surface direction on the lumbar support main body 71, and elastically deforms along the support shape portion of the side frame member 73 corresponding to the bulged portion of the lumbar support 70. Therefore, a large elasticity tolerance is ensured in a large range of the lumbar support main body 71, and the body can be flexibly supported over a large range of the body support surface.

  Furthermore, when the seated person takes a posture that turns from one side in the width direction to the rear, the load from the seated person acts biased to one side in the width direction of the backrest 50, and the vertical side of the biased side A load that twists and deforms the vertical frame portions 53A and 53B acts on the frame portions 53A and 53B.

  Since the upper members 56A and 56B of the vertical frame portions 53A and 53B are torsionally deformed by the force acting from the tension member 51, the upper members 56A and 56B are deformed so as to follow the deformation of the back and shoulders of the seated person according to the load of the seated person The backrest 50 can be tilted backward by receiving the back so as to be wrapped with the upholstery.

  When the load from the seated person is transmitted from the tension member 51 of the backrest 50 to the pair of vertical frame portions 53A and 53B, the upper members 56A and 56B of the vertical frame portions 53A and 53B are twisted and deformed. The pair of connecting pieces 43A and 43B connected to the upper members 56A and 56B are displaced with the torsional deformation of the upper members 56A and 56B.

  Therefore, when the posture is such that it turns backward from one side in the width direction, the upper members 56A and 56B on one side are torsionally deformed, and the connecting pieces 43A and 43B on one side are displaced to stretch the back. Since it can be received so as to be wrapped together with the material, it can be stably supported in the state following the deformation on the back and shoulders of the seated person.

As described above, according to the lumbar support 70 according to the first embodiment, a large elasticity tolerance can be secured in a large range of the lumbar support main body 71, and the body can be flexibly supported over a large range.
Moreover, according to the chair 1 which concerns on 1st Embodiment, since a face material can easily follow a seated person's load and can fully receive a seated person's load, providing a chair excellent in sitting comfort. Can do.

(Second Embodiment)
Hereinafter, the lumbar support 170 according to the second embodiment of the present invention will be described with reference to FIG.
The lumbar support 170 according to the second embodiment is different from the lumbar support 70 according to the first embodiment in that the lumbar support 170 extends from the mounting member 80 in the left-right direction as blade wall portions 172A, 172B (172). ), And left and right blade wall portions 172A and 172B (172) are formed with guide receiving portions 173A and 173B (173) that protrude forward and have recesses on the rear.

Further, the wing wall portions 172A, 172B (172) are connected to the lower side of the left and right side frame members 73A, 73B (73) and the entire length of the side frame member 73.
The guide receiving portions 173A and 173B (173) are slidably supported by the left and right vertical frame members 53A and 53B (53), and are slidable using the vertical frame members 53A and 53B (53) as guides. Is a point. Since others are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  According to the lumbar support 170 according to the second embodiment, the wing wall portions 172A and 172B (172) extending to the left and right of the lumbar support main body 71 engage with the left and right vertical frame members 53A and 53B (53). Since the lumbar support 170 is firmly supported by the vertical frame members 53A and 53B (53), the strength of the lumbar support can be improved by connecting the side frame portion and the mounting member via the wing wall portion. it can.

  Further, since the guide receiving portions 173A and 173B (173) of the wing wall portions 172A and 172B (172) are slidable using the left and right vertical frame members 53A and 53B (53) as guides, the height of the lumbar support 170 is increased. The thickness adjustment can be performed efficiently.

  When the wing wall portions 172A, 172B (172) are supported by the left and right vertical frame members 53A, 53B (53) as described above, the lumbar support 70 is not related to the connecting member 90. Alternatively, the backrest 50 may be connected to the wing wall portions 172A and 172B (172).

In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention.
For example, in the above embodiment, the case where the lumbar support 70 is configured not to contact the upholstery material 51 in a state where the seated person is not seated has been described, but in the state where the seated person is not seated, The lumbar support 70 may be configured to come into contact with the upholstery material 51.

  Moreover, in the said embodiment, although the case where the lumbar support main body 71 was supported by the protrusion part 75 provided with the tongue-like protrusion b75A and the effective locking wall part 75B was demonstrated, the lumbar support main body 71 and the side frame member 73 may be connected by means other than the protrusion 75.

  Moreover, in the said embodiment, although the case where a protrusion part was formed in the side frame member 73 which comprises a face material support member was demonstrated, the structure in which a protrusion part is formed in the lumbar support main body 71 which comprises a face material. It is good.

Further, whether the protrusion 75 has a plurality of shapes or a structure having a plurality of protrusions can be arbitrarily set.
Moreover, in the said embodiment, although the case where the protrusion part 75 was provided with the perforated latching wall part 75B was demonstrated, it can also be only a protrusion part in which a through-hole is not formed.

Moreover, in the said embodiment, the attachment member 80 is provided with the connection part 81 extended in the left-right direction, and the attachment part 85 which supports a connection part, and the backrest 50 (specifically, by the connection member 90, Although the case where it connects with the backrest rear part support member 40 was demonstrated, the attachment member 80 may be comprised with a flat plate etc., and you may connect with a backrest irrespective of the connection member 90. FIG.
Moreover, although the case where the connection member 90 was provided with the 1st engagement wall part 97 and the 2nd engagement wall part 98 was demonstrated, what kind of connection structure is made can be set arbitrarily.

  In the above-described embodiment, the second engaging portion of the connecting member 90 elastically deforms the second engaging wall portion 98 downward and engages the convex portion 40B formed on the engaging rib 40A. However, it is not essential that the convex portion 40B is formed on the rib. For example, the rear support member 40 is configured by forming an insertion hole like the first engaging portion. You may comprise by the wall part (upper part or lower side edge) to do.

  Moreover, in the said embodiment, although the lumbar support main body 71 demonstrated the case where it was connected with the attachment member 80 in the upper part of the side frame members 73A and 73B (73) in the cantilever state, for example, of the attachment member 80 In the state where a connecting portion extending in the left-right direction is provided at the lower portion and connected to the lower portion of the side frame members 73A, 73B (73), a gap is formed between the upper and lower edges of the lumbar support main body 71 and the mounting member 80, The upper and lower edges may be free edges.

  Further, the upper part of the side frame members 73A and 73B (73) and the attachment member 80 are not connected, and the attachment member 80 is connected to the attachment member 80 in a cantilever state only by the lower part of the side frame members 73A and 73B (73). It is good.

  Further, in the above-described embodiment, the case where the lumbar support 70 is attached to the back support member 40 on the backrest behind the upholstery material 51 has been described, but the lumbar support 70 may be disposed on the front side of the upholstery material 51. Good.

  Moreover, although the case where the lumbar support body 71 is a soft material such as an elastomer has been described, other materials may be used, or a material that does not have translucency may be used.

  According to the face material mounting structure, the body support member, and the chair connection structure according to the present invention, sufficient elastic deformation tolerance can be ensured over as large a range of the body support surface as possible, and thus it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Chair 40 Backrest support member 41 Lower connection part 43 Upper connection part 50 Backrest 51 Upholstery material 70, 170 Lumber support 71 Lumber support main body (support member)
71G Wall (locked part)
73 Side frame member (face material support member)
75 Projection 75A Tongue Projection (Projection)
75B annular protrusion (perforated locking wall, protrusion)
76U through hole 76Y notch
97 1st engagement wall part 98 2nd engagement wall part 172 Wing wall part

Claims (7)

A lumbar support used in a chair having a seating surface and a backrest erected with respect to the seating surface,
A lumbar support body that extends in the left-right direction and bulges forward in a side view and is elastically deformable;
A pair of side frame members for supporting the support portion of the lumbar support body on the left and right sides;
An attachment member that supports the side frame member and attaches the side frame member to the backrest, and
The lumbar support body is characterized in that a free edge that can be deformed rearward is formed vertically. The lumbar support according to claim 1,
The mounting member is
A lumbar support comprising: a connecting portion that extends in the left-right direction and connects the side frame member in the left-right direction; and a mounting portion that supports the connecting portion and attaches the side frame member to the backrest. . The lumbar support according to claim 1 or 2,
The side frame member is
A lumbar support, characterized in that the lumbar support includes projecting portions that project toward the left and right edges of the lumbar support body and engage the lumbar support body and the left and right edges. The lumbar support according to claim 3,
The protrusion is
A plurality of side frame members are formed corresponding to the left and right edges of the lumbar support body,
At least a part of the lumbar support is inserted into and locked into the lumbar support body. The lumbar support according to claim 4,
The protrusion that enters and locks into the lumbar support main body includes a perforated locking wall portion having a through hole with a closed periphery,
A lumbar support, wherein a locked portion formed in the lumbar support main body and extending in the thickness direction of the lumbar support main body passes through the through hole. The lumbar support according to any one of claims 1 to 5,
A pair of left and right vertical frame members formed along the vertical direction of the backrest are used for a chair,
A lumbar support comprising a blade wall portion extending to the left and right of the mounting member and engaging with the vertical frame member. A seating surface;
With a backrest,
A chair with upholstery,
The chair characterized by the lumbar support of any one of the said Claims 1-6 being arrange | positioned behind the said tension material.

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