JP6301111B2 - Chair - Google Patents

Description

  The present invention relates to a chair provided with a lumbar support that is attached to the back of a back and supports a waist of a seated person.

  2. Description of the Related Art Conventionally, a chair having a back frame structure in which a back constituting the chair is configured by attaching a tension material to the back frame is known. As such a chair, there exists a thing of the following patent document 1, for example. In this structure, a back frame and a seat frame are integrally configured, and a seating surface is formed by attaching a mesh ground to an opening formed in the back frame and the seat frame.

  Furthermore, in a chair with such a back frame structure, as described in Patent Document 2 below, it is also effective to attach a lumbar support for the purpose of reducing the burden on the waist. The lumbar support is usually in the form of a belt, and is provided so as to be bridged to the left and right of the back frame on the back surface of the tension member. And the waist part can be supported with a tension material by producing the reaction force which opposes the load to the back by a waist part.

  In addition, the lumbar support described in Patent Document 2 has a structure in which the left and right sides of the lumbar support main body portion formed in a block shape are supported by a pair of support portions formed in a thin strip shape. The lumbar support main body part can be moved to an appropriate position along the waist of the seated person by deforming the support part exclusively when leaning on the back.

  Furthermore, as in Patent Document 3, by changing the engagement position of the left and right belts (support portions), the length of the support portion is apparently changed, and the regulation amount of the waist by the lumbar support is easily changed. What is possible is also disclosed. Specifically, this is a first belt in which one end is fixed to a backrest structure and a lumbar plate (lumbar support main body) is provided on the other end which is an open end, and one end is a backrest structure. A second belt fixed to the object and having the other end opened as an open end, and by engaging the open ends of both belts, the lumbar support is bridged across the back and right Yes. Further, an operation portion for changing the engagement position of both belts is provided on the back surface of the lumbar support main body portion so that the length of the belt, that is, the length of the support portion can be changed. By doing this, when the length of the support part is shortened, the waist part can be firmly supported by strengthening the regulation of the waist part by the lumbar support. When the length of the support part is lengthened, the waist part by the lumbar support is supported. The waist can be flexibly supported together with other parts by weakening the regulation. Therefore, it is possible to easily change the amount of regulation of the waist due to the lumbar support according to the user's physique and preference.

JP 2007-260118 A JP 2008-119411 A JP 2007-135641 A

  However, as disclosed in Patent Document 3, when the lumbar support main body is provided with a mechanism for changing the engagement position with the support, the structure of the lumbar support main body becomes complicated and thick. It is difficult to give flexibility to itself. Therefore, depending on the body shape and posture of the seated person, the adhesion to the waist cannot be increased beyond a certain level, and the support of the waist part becomes partial, so that the load when the seated person is seated on the back is one part of the waist. There may be a case where it becomes impossible to concentrate on only the part and maintain stability.

  In addition, when changing the amount of regulation by lumbar support, it is necessary for the seated person to operate the operation part provided in the lumbar support main body part directly behind, so the operation is performed with the seated person still seated. It is not always easy to do.

  An object of the present invention is to effectively solve such a problem. Specifically, the lumbar support supports the lumbar region in a wide range, and can stably hold the body, and the lumbar support. It aims at providing the chair which can change regulation amount easily.

  In order to achieve this object, the present invention takes the following measures.

That is, the chair of the present invention includes a pair of vertical eaves constituting a part of the back frame, and a lumbar support arranged on the back side of the tension member attached to the back frame, One end of the lumbar support body constituting the lumbar support is fixed, and the other longitudinal end of the lumbar support body is formed with a stopper receiving portion protruding rearward while restraining the other end portion of the lumbar support body in the vertical direction. A support portion having a stopper member formed as a cam that is movably supported in a direction and is provided between the support portion and the other end portion of the lumbar support body, at one end side of the lumbar support body. A restricting means for restricting the displacement in the left-right direction toward the head is constituted by the stopper receiving portion and the stopper member, and the lumbar support book by the restricting means The permitted amount of displacement in the lateral direction of the other end portion provided with the operation portion can be changed by rotating the stopper member to the supporting portion. Further, the cam contacts a part of the stopper receiving portion .

  With this configuration, the end of the lumbar support body can be changed by changing the amount of relative displacement in the left-right direction without changing the position of the other end of the lumbar support body in the up-down direction. By effectively deforming almost all other parts of the body and supporting the waist in a wide range, it is possible to obtain good waist support, and an operation unit is provided on the downspout to make it possible to change the amount of deformation Therefore, good operability can be obtained.

In order to be able to easily change the amount of deflection of the lumbar support according to the preference of the seated person, the restricting means includes a stopper receiving portion provided at the other end of the lumbar support body, A stopper member that is provided on a vertical shaft and locks the stopper receiving portion in the left-right direction, and the stopper member locks the stopper receiving portion by an operation of rotating the stopper member of the operating portion. It is preferable that the configuration can be changed in the left-right direction.

And the flexural deformation of the lumbar support easier, the present invention in order to be able to obtain a better lumbar support, one end portion of the lumbar support body, and at least of the support portion for supporting the other end portion Any one of them is configured to be provided in the downspout so as to be inclined or tiltable toward the rear.

In addition, in order to facilitate the restoration of the lumbar support body after bending deformation to the original shape and improve the appearance when a person is not seated, the support portion is attached with the stopper member. It was provided with a regulating member attached to the body portion and the body portion, and a said regulating member with these body parts, the lumbar support body in the longitudinal direction of the gap formed by the regulating member with these body portion It is preferable that the other end portion of the lumbar support main body is accommodated, and the other end portion of the lumbar support main body is configured to be movable in the left-right direction along the gap while the deflection angle is regulated by the regulating member. Here, the bending angle represents the angle of the end portion of the lumbar support when the lumbar support body is bent and deformed with reference to the free state.

In order to make it easier to restore the lumbar support body after bending deformation, one end of the lumbar support body is fixed to the front surface of the vertical rod, and the center of the lumbar support body is bent backward. it is preferable that the projecting piece when the deformed configured to be supported by the inner surface of the longitudinal rod.

  In addition, in order to give an impression that the vicinity of the center of the chair is widely opened and to provide a chair with a light design and excellent design, it is preferable that the upholstery material is made of mesh fabric. .

  Furthermore, in order to increase the light transmittance in the front-rear direction in combination with the mesh ground and further enhance the above effect, the lumbar support body is preferably configured to be transparent or translucent. It is.

  According to the present invention described above, it is possible to provide a chair that can support the waist with a lumbar support in a wide range, can stably hold the body, and can easily change the regulation amount by the lumbar support. Is possible.

The perspective view which shows the chair which concerns on one Embodiment of this invention. The side view of the chair. The front view in the state which removed the mesh ground and the lumbar support from the chair. The enlarged end elevation which cut | disconnected the vertical shaft of the chair in the AA position of FIG. The expanded end elevation which cut | disconnected the upper frame part of the chair in the BB position of FIG. The expansion perspective view which shows the principal part of the back frame of the chair. The expansion perspective view which shows the lower frame part periphery of the back frame which comprises the chair. The expansion perspective view which shows the state which removed the groove formation member from the state of FIG. The enlarged end elevation which cut and showed the lower frame part of the chair in CC position of Drawing 7 typically. The schematic diagram which decomposes | disassembles and shows the mesh ground and strip | belt body which comprise the chair. The perspective view which expands and shows the back frame and lumbar support which comprise the chair. The rear view which expands and shows a part of same back frame and lumbar support. The perspective view which decomposes | disassembles and shows the lumbar support. The perspective view which expands and shows the attachment part periphery of the lumbar support in a vertical shaft The enlarged end view which cut | disconnected the end part of a vertical shaft and a lumbar support in the VV position of FIG. The enlarged end view which cut | disconnected the end part of the vertical shaft and the lumbar support in the WW position of FIG. Explanatory drawing which shows the state which enlarged the amount of regulation by a stopper member in the same lumbar support. Explanatory drawing which shows the state which provided the load from the back to a lumbar support from the state of FIG. Explanatory drawing which shows the state which made the restriction amount by a stopper member small in the same lumbar support. Explanatory drawing which shows the state which provided the load from the back to the lumbar support from the state of FIG. The schematic diagram which shows the structure of a lumbar support main body. The disassembled perspective view which shows the example which deform | transformed the lumbar support. The perspective view which looked at the lumbar support main body shown in FIG. 22 from the back side. The perspective view which shows the modification of the lumbar support different from FIG. The schematic diagram which shows the modification of a lumbar support main body. The schematic diagram which shows the modification of the lumbar support main body different from FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the chair of this embodiment, as shown in FIG. 1, a seat 2 is arranged above a leg 1 and a back 3 is erected on the back of the seat 2, and the seat 2 and the back 3 are placed by the leg 1. It is configured as a swivel chair supported rotatably.

  Here, in the embodiment of the present application, when the direction is indicated, the terms “vertical direction”, “front / rear direction”, and “left / right direction” are used, which are the same as the general direction when the chair is raised as shown in FIG. , A vertical direction (Z direction in the figure), a direction substantially perpendicular to the spine 3 (X direction in the figure), a vertical direction and a direction perpendicular to the front-rear direction (Y direction in the figure).

  The structure of the chair will be described in detail. The leg 1 is configured such that the leg strut 12 is rotatably supported at the center of five leg blades 11 to 11 that extend radially and have casters 11a at the tips. As shown in FIG. 2, a support base 13 serving as a basis for supporting the back 3 and the seat 2 is provided at the upper end 12 a of the leg column 12. A gas spring (not shown) is incorporated in the leg column 12, and the upper end 12 a of the leg column 12 can be moved up and down together with the support base 13 by operating this.

  The support base portion 13 is formed of a rigid body such as an aluminum die cast, extends slightly forward and forward from the leg column 12, and the tip 13 a supports the front portion 21 a of the seat 21. A seat surface 22 including a cushion is provided in the upper portion of the seat receiver 21, and the seat 2 is configured by these.

  Further, the support base 13 rotatably supports a back support rod 14 formed of a metal frame at the left and right positions of the leg support 12, and the back support rod 14 extends rearward and upward. A back frame 31 as a frame is provided at the tip 14a. Further, the rear portion 21b of the seat receiver 21 is rotatably supported at a position midway from the position where the back support rod 14 is supported by the support base 13 toward the tip 14a. Therefore, the back frame 31 and the seat receiver 21 operate in conjunction with the support base 13 while a part of the rotation fulcrum slides, so that a so-called synchro-rocking operation is possible.

  A gas spring type reaction force mechanism 14 s (see FIG. 7) is provided inside the back support rod 14 so as to generate a reaction force against the rearward tilt of the back frame 31. Similarly, a reaction force mechanism (not shown) is also provided inside the support base 13 so as to generate a reaction force against the movement of the seat receiver 21. A resin cover 15 is divided into a plurality of parts around the back support rod 14 and is configured to cover the back support rod 14 together with the reaction force mechanism 14s described above.

  As will be described later, the back frame 31 is provided with a mounting groove G that is open on the outer peripheral side in order to attach a mesh ground 38 that is a tension material. 38 can be attached by inserting an edge 38a (see FIG. 10), and the spine 3 is configured together with the mesh ground 38.

  As shown in FIG. 2, the back frame 31 is inclined slightly rearward as a whole, and is reduced in size in the front-rear direction while being curved upward from below. The back frame 31 is provided with a lumbar support 6 as an optional member as shown in FIG. The lumbar support 6 is disposed on the back surface of the mesh ground 38, and can support the waist through the mesh ground 38 when a seated person leans against the back 3.

  Hereinafter, first, the description will be focused on the configuration of the back frame 31. Therefore, in FIGS. 3, 7, and 8, a mounting portion 76 (FIG. 14) described later for mounting the lumbar support 6 (see FIG. 1) is omitted.

  FIG. 3 shows a state in which the mesh ground 38 and the lumbar support 6 are removed from the chair and viewed from the front. The back frame 31 is configured by a frame main body 32 and a groove forming member 36 that forms the above-described mounting groove G (see FIG. 2) in cooperation with the frame main body 32 by attaching to the frame main body 32.

  The frame body 32 is composed of a pair of vertical rods 33, 33 extending in the vertical direction, and a pair of horizontal rods 34, 35 that connect the upper and lower portions to each other. Is formed with a substantially rectangular opening OP. The frame body 32 is molded by resin integral molding using a mold, but can be molded using a metal material such as aluminum.

  The vertical rods 33, 33 arranged on the left and right have a symmetrical shape, but the horizontal rods 34, 35 arranged on the upper and lower sides have completely different functions because they have different functions. Therefore, in the following, the upper reed is referred to as the upper frame portion 34, and the lower recumbent is referred to as the lower frame portion 35.

  When viewed from the front, the vertical rods 33 and 33 are arranged with the interval slightly narrowed upward. Therefore, the spine 3 is configured to become slightly smaller upward. The upper frame portion 34 connected to these is formed to be slightly curved so that the center is convex upward, and the connection portion with the vertical rods 33 and 33 is formed by a smooth arc. The lower frame portion 35 is also formed so as to be connected to the vertical rods 33 and 33 by a smooth curve, and is configured such that the center dimension is about twice as large as the center in both the left and right direction ends. (Refer to FIG. 7), and the back support rod 14 described above is connected to the center portion.

  As shown in FIG. 2, the vertical rod 33 is provided with a curved portion and an inclined portion in a side view from the bottom to the top. Specifically, immediately above the connecting portion with the lower frame portion 15, a first region R1 that is a curved portion in which the front surface 33a that is a support surface is curved so as to be convex forward, and above the first region R1 The second region R2 that is curved in the direction opposite to the first region R1 so that the front surface 33a is concave toward the front, and the third region that is set above and tilts the front surface 33a toward the rear It is a shape based on an ergonomic viewpoint provided with R3. As shown in the figure, the human spine line LB draws a gentle S-curve, so that the vertical rod 33 also draws a substantially similar curve in a side view. That is, the first region R1 is a waist region that is set at the height position of the waist when a person with a standard figure is seated, and the second region R2 is when the person with the standard figure is seated. The lumbar region and the back region have a shape that substantially matches the curvature of the seated person's spine in a side view. Further, the third region R3 is a shoulder region that is provided at the height position of a standard human body's shoulder and is shaped to separate the back frame 31 from the shoulder of the seated person. The aforementioned lumbar support 6 (see FIG. 1) is provided in the first region R1.

  By attaching the mesh ground 38 to such a vertical rod 33, the mesh ground 38 can be shaped along the front surface 33 a of the vertical rod 33. That is, a waist region (first region R1), a back region (second region R2), and a shoulder region (third region) can be formed on the entire support surface of the seated person on the back 3. Therefore, based on an ergonomic point of view, the waist and back can be supported along the curvature of the human spine, and the body can be held in an appropriate posture with little fatigue even when sitting for a long time. Also, in the shoulder area, based on ergonomics, it is possible to secure a space around the shoulder to make it easier to move the arm and improve work efficiency, and as a support area for relaxing when the upper body is warped It can be used. Since the shoulder region is formed so as to be separated from the shoulder, it does not necessarily have to be provided at the same height as the shoulder as long as it is above the back region, and is slightly lower than the shoulder. Even when formed, the above-described effects can be obtained.

  Here, the AA position in FIG. 3, that is, the end face shape when the vertical hook 33 is cut in the second region R2, is shown in FIG. As shown in this figure, the vertical rod 33 is formed as a plane portion in which the front surface 33a serving as a support surface of the mesh ground 38 is substantially orthogonal to the front-rear direction, and is generally orthogonal to the front surface 33a, that is, It has a shape extending toward the rear. Furthermore, the outer side surface 33b continuing to the outer side of the front surface 33a is formed so as to be inclined inward as it goes rearward. On the inner side of the front surface 33a, a relief surface 33c that inclines inward as it goes rearward is formed, and an inner side surface 33d that inclines toward the outside as it goes rearward is formed continuously with the escape surface 33c. A rear surface 33e is formed between the inner surface 33d and the outer surface 33b. Further, most of the front surface 33a, the outer surface 33b, the clearance surface 33c, the inner surface 33d and the rear surface 33e are connected to each other by smooth curved surfaces. A region formed by adding the flank 33c to the curved surface connecting the front surface 33a and the flank 33c is a flank region Rc that is set inside the front surface 33a and gradually moves away from the mesh ground 38 toward the inside.

  A mounting groove 33g is formed at a position in the vicinity of the front surface 33a in the outer side surface 33b so as to be substantially parallel to the front surface 33a, that is, with the outer peripheral side as an opening direction, and an edge 38a (see FIG. 10) is formed in the mounting groove 33g. When the mesh ground 38 is inserted and attached, the mesh ground 38 is stretched inward from the outer surface 33b via the front surface 33a. Therefore, the front surface 33a functions as a support surface that regulates the position of the mesh ground 38 and contributes to the formation of the overall shape. In addition, since the relief region Rc is formed inside the front surface 33a that is the support surface, the mesh ground 38 hardly affects the cross-sectional area of the entire vertical rod 33, that is, does not cause a decrease in strength. The support area is reduced to make it easier to bend. Furthermore, although the flank 33c is separated from the mesh base 38 in a normal state, when the mesh base 38 is deformed by leaning on a person, it is possible to increase the stability by contacting the mesh base 38. It has become.

  The front surface 33a is designed to have a certain area or more, so that when the seated person shifts his / her posture from side to side, he / she does not bite into his / her back to cause discomfort or discomfort. Further, a relief surface 33c is formed on the inner side of the front surface 33a so as not to form an acute corner, thereby relieving contact with the body. The upper frame portion 34 has a shape that is recessed like a wing cross section toward the rear from the front surface and the flank 33c that can come into contact with the body of the seated person. Furthermore, the rear surface 33e is formed to be sufficiently smaller than the front surface 33a, so that the shape feature is more prominent. In addition, when a simpler shape is assumed in which the inner surface 33c and the front surface 33a are extended without forming the flank 33c, it can also be said that the sectional view is substantially triangular. The vertical rod 33 has such a cross-sectional shape so that the front-rear dimension L2 is larger than the left-right dimension L1 (in the present embodiment, approximately twice). From the viewpoint of the amount of material used, strength, and design, the front-rear dimension L2 is preferably 1.5 times to 3 times the left-right dimension L1. Because of the dimensional relationship as described above, there are few visible portions of the vertical hook 33 through the mesh ground 38 in the front view, and a more refined impression can be given. In addition, since the load on the vertical rod 33 mainly acts as a result of the seat occupant leaning backward, it is possible to ensure the strength against the load on the rear by increasing the front-rear dimension L2. It has become.

  In other words, the vertical rod 33 has a reverse triangle shape with respect to the front and rear dimensions of the front half portion in which the front surface 33a and the flank surface 33c functioning as pressure-receiving surfaces and the groove 33g functioning as a tension member attachment location are formed. The thickness of the latter half of the shape is almost the same or greater.

  The vertical rod 33 has substantially the same shape along the vertical direction including not only the second region R2 but also the first region R1. That is, since the dimension in the front-rear direction (front-rear dimension L2) is smaller than the dimension in the left-right direction (left-right dimension L1), the first region R1, second region R2, It is possible to appropriately form the three regions R3.

  As described above, the front-rear dimension L2 becomes smaller (in the present embodiment, about 1/2) as it goes upward, but the left-right dimension L1 is hardly changed (see FIG. 3). The ratio of the upper front-rear dimension to the lower front-rear dimension L2 is preferably about 30 to 60%. Due to the dimensional relationship as described above, it appears that the size of the vertical hook 33 hardly changes between the upper part and the lower part in a front view, and a stable impression can be given (see FIG. 2). In addition, the bending moment due to the backward load caused by the seated person leaning on is larger toward the lower side of the vertical rod 33 and smaller toward the upper side. Therefore, as described above, the longitudinal dimension L2 is decreased toward the upper side. However, there is no shortage of strength, and it is possible to produce a refined impression that the upper part is thinner in a side view, and it is also possible to reduce the manufacturing cost by reducing the material.

  Next, the shape of the upper frame portion 34 will be described. FIG. 5 shows a cross-sectional shape when the upper frame portion 34 is cut at the BB position in FIG.

  As shown in this figure, the upper frame portion 34 is formed as a flat portion with the front surface 34a extending obliquely upward, and an upper surface 34b that is inclined downward toward the rear continuously above the front surface 34a is formed. Has been. In addition, a relief surface 34c that slopes downward as it goes rearward downward from the front surface is formed, and a lower surface 34d that slopes upward as it goes rearward is formed continuously from the relief surface 34c. ing. Adjacent ones of the front surface 34a, the upper surface 34b, the flank surface 34c, and the lower surface 34d are connected by a smooth curved surface. Similar to the vertical rod 33 (see FIG. 4) described above, a region obtained by adding the flank 34c to the curved surface connecting the front surface 34a and the flank 34c is set on the inner side of the front surface 34a and gradually meshes toward the inner side. This is an escape region Rc that is spaced apart from 38.

  Of the curved surface connecting the front surface 34a and the flank 34c, the most forwardly protruding portion constitutes the leading edge Ef along the extending direction of the upper frame portion 34, and is a curved surface connecting the upper surface 34b and the lower surface 34d. Of these, the rearmost protruding portion constitutes the rear edge Er along the extending direction of the upper frame portion 34.

  A mounting groove 34g is formed in the upper surface 34b at a position forward from the center position in the front-rear direction, specifically, at a position near the front surface 34a, substantially parallel to the front surface 34a, that is, with the outer peripheral side as the opening direction. If the mesh ground 38 is attached by inserting the edge 38a (see FIG. 10) into the mounting groove 34g, the mesh ground 38 extends from the upper surface 34b along the front surface 34a, and the shape of the upper portion of the vertical rod 33 Will be arranged diagonally downward.

  Like the front surface 33a of the vertical rod 33, the front surface 34a functions as a support surface that supports the mesh ground 38. Since the escape region Rc is formed inside the front surface 34a that is the support surface, the upper frame The support area of the mesh ground 38 is reduced without substantially affecting the cross-sectional area of the entire portion 34, that is, without causing a decrease in strength, so that bending is easily caused. Furthermore, the front surface 34a has a certain area or more, and when the seated person makes his / her body bow, the upper frame portion 34 bites into the back. It does not cause discomfort or discomfort. In addition, a relief surface 34c is formed below the front surface 34a so as not to form an acute corner, thereby softening contact with the body. And the upper frame part 34 is made into the shape which became constricted like the wing | blade cross section toward the back from the front surface 34a and flank 34c which can contact a seated person's body. In addition, when the simple shape which does not provide the flank 34c is assumed, it can be said that it is formed in the cross-sectional view substantially triangular shape which goes to the rear edge Er from the front surface 34a. By doing so, the front-rear dimension L4 is made larger than the vertical dimension L3 (in the present embodiment, approximately 1.7 times). From the viewpoint of the amount of material used, strength, and design, the front-rear dimension L4 is preferably 1.4 times to 2.5 times the left-right dimension L3. Because of the above dimensional relationship, it is possible to give a more refined impression with fewer visible parts of the upper frame part 34 through the mesh ground 38 in the front view as with the vertical gutter 33. It is possible to ensure the strength against the backward load that mainly acts.

  In other words, like the vertical rod 33, the upper frame portion 34 also has a front-rear dimension and a front-rear dimension in which a front surface 34a and a flank surface 34c that function as pressure-receiving surfaces and a groove 34g that functions as a tension member attachment location are formed. The thickness of the latter half of the inverted triangular shape is almost the same or larger.

  The upper frame portion 34 and the vertical rod 33 are smoothly continuous as shown in FIG. 6, and the mounting grooves 34g and 33g provided in each are also formed to be continuous. Therefore, the mesh ground 38 is stretched while forming a smooth surface between the upper frame portion 34 and the vertical rod 33.

  Next, the shape of the lower frame part 35 will be described. Since the lower frame portion 35 is connected to the back support rod 14 as described above, the lower frame portion 35 is configured to be larger than the other vertical rod 33 or the like as shown in FIG. The back support rod 14 is screwed to the lower surface of the lower frame portion 35, and the reaction force mechanism 14s described above is provided therein.

  The lower frame portion 35 is connected to the upper plate portion 35a extending in the left-right direction and constituting a part of the peripheral edge of the above-described opening, and the lower frame 35 is connected to the center of the rear portion of the upper plate portion 35a. It is comprised by the board part 35b and the side board parts 35c and 35c connected to the lower board part 35b and the upper board part 35a from the right and left vertical rods 33 and 33, and is mutually connected by the smooth curved surface. As a result, the lower frame part 35 forms a concave internal space S that is opened forward and the opening forms a substantially inverted trapezoid. The internal space S also functions as a meat stealer in molding, contributing to the reduction of materials and weight reduction. Further, the lower plate portion 35b is set to have a larger size in the front-rear direction than the upper plate portion 35a in order to ensure a wide mounting space for the back support rod 14 that supports the entire back 3. The lower plate portion 35b also functions as a support rod continuous with the back support rod 14, and is formed integrally with the frame main body 32, so that the number of parts can be reduced and an overall sense of unity can be obtained. An appearance can be obtained. If this is not a problem, the lower plate portion 35b and the side plate portions 35c and 35c can be configured separately from the frame main body 32. The lower frame portion 35 as a whole has a shape that is longer in the front-rear direction than the vertical frame 33 and the upper frame portion 34, and gives a more unified and refined excellent design. ing.

  However, unlike the vertical rod 33 and the upper frame portion 34, the mesh ground 38 interferes with the back support rod 14 even if the mounting groove G having the outer peripheral side as the opening direction is formed in the lower plate portion 35 b and the side plate portion 35 c. For this reason, it becomes impossible to perform installation. For this reason, a mounting groove 35g having an outer peripheral side in the open direction is formed below the upper plate portion 35a in the lower frame portion 35, and is configured to be continuous with the mounting grooves 33g and 34g of the vertical rod 33 and the upper frame portion 34. Can be considered. However, since the lower frame portion 35 is formed with the internal space S opened forward as described above, when the lower frame portion 35 is molded using a mold, the mold The pulling direction is set to the front-rear direction. Therefore, the mounting groove G is formed on the upper plate part 35a whose lower part is covered by the lower plate part 35b, that is, at the position overlapped by the lower plate part 35b when viewed from the outer peripheral side, even if a slide mold is used. It is difficult to do. With regard to the above points, when focusing on the positional relationship with the attachment groove G as the center, the attachment groove 35g formed in the lower frame portion 35 for attaching the mesh ground 38 intersects the surface extending in the opening direction (outer peripheral direction). It can be considered that the lower plate portion 35b having another structure is integrally provided at the position where the operation is performed.

  Therefore, in the present embodiment, as shown in FIG. 8, the mounting groove 35 g (see FIG. 9) is formed by mounting the groove forming member 36 along the upper plate portion 35 a in the internal space S of the lower frame portion 35. It is possible to do. Since the internal space S is largely open to the groove forming member 36, it is possible to easily perform the attaching operation. The groove forming member 36 is a flat plate member along the upper plate portion 35a, and the through holes 36a are formed at five positions spaced apart in the left-right direction. And the back frame 31 which is a frame body is comprised with the frame main body 32 by screwing using this through-hole 36a and the screw hole 35d1 formed in the lower frame part 35. As shown in FIG.

  Specifically, as shown in FIG. 9, the upper plate portion 35a is provided with a step portion 35d formed by being recessed backward, and the screw hole 35d1 described above is formed in the step portion 35d. A recess 35e formed by further recessing is provided below the step 35d. Then, by attaching the groove forming member 36 to the stepped portion 35d, it is possible to form the attachment groove 35g between the concave portion 35e and the groove forming member 36.

  The mounting groove 35g is formed over substantially the entire circumference of the back frame 31 provided with the opening OP together with the mounting grooves 33g and 34g formed in the vertical rod 33 and the upper frame portion 34, for attaching the mesh ground 38. A substantially continuous mounting groove G is formed. As shown in FIG. 7, the mounting groove 33 g formed in the vertical rod 33 is interrupted at a position close to the lower frame portion 35, and the mounting groove 35 g formed by the lower frame portion 35 and the groove forming member 36 is Not continuous. However, since the end portions of both the mounting grooves 33g and 35g are formed in a continuous positional relationship when they are extended to each other, it can be considered that they are substantially continuous. Of course, by changing the shape of each member, the mounting groove G can be configured to be completely continuous.

  When the mesh ground 38 is attached, the groove forming member 36 is covered with the lower frame portion 35 and the mesh ground 38, so that the groove forming member 36 hardly stands out and the back frame 31 is connected to the frame main body 32. Even if divided into the groove forming member 36, the design is not impaired. Further, the mesh ground 38 is attached to the lower frame portion 35 constituting the back frame 31, thereby covering the entire opening OP formed in the back frame 31, creating a sense of unity of the entire back 3, and the back 3 Since it is arranged below the seat 2 in the front view (see FIG. 3), it is possible to have a more luxurious design.

  Here, as shown in FIG. 10, the mesh ground 38 is cut into a back shape and a band-shaped reinforcing band 39 is attached to the edge 38a inserted into the mounting groove G (see FIG. 2) by sewing. Therefore, the mesh ground 38 is configured so that the edge 38a is inserted into the mounting groove G together with the reinforcing band 39, so that the mesh 38 can be held in a firmly inserted position and the form can be stabilized. The portions corresponding to the vertical rods 33 and 33 and the upper frame portion 34 are attached by sewing three-dimensionally while bending one reinforcing band 39, and only another reinforcing band only on the portion corresponding to the lower frame portion 35. 39 is attached. Between the two reinforcing bands 39, 39 is a portion located between the mounting groove 33 g formed in the vertical rod 33 and the groove 35 g provided in the lower frame portion 35, and a simple recess 38 b to which the reinforcing band 39 is not attached. Only fraying processing of the mesh ground 38 is performed.

  In this way, the mesh ground 38 is inserted into the attachment groove G formed over substantially the entire circumference of the back frame 31 so as to be stretched along the shape of the back frame 31 to constitute the back 3. Yes. Since the mounting groove G is formed with the outer peripheral side open at each position, the edge 38a of the mesh base 38 can be easily inserted, and the mounting work can be easily performed. Further, since the mesh ground 38 extends in a direction approximately 180 ° opposite to the mounting groove G, the direction in which the tension acts and the opening direction of the mounting groove G are almost opposite to each other, and do not come off easily. .

  Moreover, the front surface of the back 3 can be made into an appropriate shape by attaching the mesh ground 38 to the attachment groove G of the back frame 31. Specifically, as described above with reference to FIG. 2, the vertical rod 33 has a first region R <b> 1, a second region R <b> 2, and a third region R <b> 3 formed from below in a side view. The mesh ground 38 is stretched while generating undulations and a flat surface, and the entire back 3 can be easily maintained in this shape. Therefore, despite the relatively simple structure in which the mesh ground 38 is attached to the back frame 31, the shape of the back 3 can be made comfortable and suitable for the body of the seated person.

  Hereinafter, the configuration of the lumbar support 6 attached to the back frame 31 will be described in detail. As shown in FIG. 1, the lumbar support 6 is attached to the first region R1 (see FIG. 2) of the vertical rods 33, 33 constituting the back frame 31, constitutes the spine 3, and the seating person's support surface By being arranged on the back side of the mesh place 38, the waist of the seated person can be supported via the mesh place 38. Further, the lumbar support 6 can be attached by using the relief region Rc (see FIG. 4) in the vertical rod 31 described above.

  As shown in FIG. 11, the lumbar support 6 is roughly composed of a lumbar support main body 61 that has flexibility and supports the waist of the seated person, and a support part 70 for supporting the lumbar support body. ing. This figure shows a state in which the lumbar support 6 is exposed by removing the mesh ground 38 (see FIG. 1). The right end 61a as one end of the lumbar support body 61 is attached to one vertical rod 33A (33) constituting the back frame 31, and the left end 61b as the other end is connected to the other through the support 70. It is attached to the vertical rod 33B (33). Hereinafter, the end located on the right side of the lumbar support main body in front view is referred to as a right end 61a, and the end located on the left is referred to as a left end 61b. Both end portions 61 a and 61 b of the lumbar support main body 61 function as attachment portions for being attached to the vertical rod 33 directly or indirectly. The support part 70 has a rectangular parallelepiped box shape that is thin in the front-rear direction, and is mainly composed of a support case 71 that is a main body part and a lid part 72 that is a restricting member attached to the front surface of the support case 71.

  The lumbar support main body 61 is formed into a thin plate shape using a resin such as polypropylene, and a plurality of (six in this embodiment) strips 62 to 62 extending in the left-right direction are arranged in parallel at equal intervals up and down. It has a shape. The belt-like bodies 62 to 62 are not limited to six, and can be appropriately changed. The strips 62 to 62 are formed with a substantially constant width in the left-right direction, and each can be independently bent and deformed. Further, the strips 62 to 62 are arranged in a plane substantially parallel to the mesh ground 38 (see FIG. 1) constituting the spine 3, so that any of the strips 62 to 62 appropriately supports the waist of the seated person. Can be done. Since it is configured as described above, slits 63 to 63 having a substantially constant width in the left-right direction are formed between the strips 62 to 62, in addition to the independent bending function of each strip 62 to 62. , It has come to give a design that makes the appearance impression refreshing and light.

  Further, the lumbar support body 61 is formed of a translucent material, and coupled with the transmission of light by the mesh ground 38, the light is transmitted in a wider area of the back 3 and a lighter impression is obtained. It is possible to give.

  FIG. 12 shows the lumbar support 6 viewed from the back. On the back side of the support case 71, an operation lever 73, which is an operation unit for changing the amount of restriction of the displacement of the lumbar support 6, is provided.

  FIG. 13 shows a state where the lumbar support 6 is disassembled. As described above, the lumbar support main body 61 is formed in a thin plate shape having the front-rear direction as the thickness direction, and has a laterally long rectangular appearance in front view. The right end 61a side is formed to be slightly thicker, and the back side is a tapered surface 61d along the relief surface 33c (see FIGS. 4 and 11) of the vertical rod 33A. In addition, screw insertion holes 61e and 61e are provided at two positions spaced apart vertically on the edge on the right end 61a side, and a rectangular attachment piece 61c protrudes rearward between these holes. Is formed. Further, a protruding piece 61f protruding rearward is formed at a position closer to the inside of the tapered surface 61d.

  Further, a stopper receiving portion 64 is formed on the left end portion 61b side of the lumbar support main body 61 so as to protrude rearward along the vertical direction of the edge portion.

  A wide range from the vicinity of the right end portion 61a of the lumbar support main body 61 to the vicinity of the left end portion 61b is formed with the same thickness, and the above-described five slits 63a to 63e are provided therein. The strips 62a to 63f of the book are formed in parallel. Among the slits 63a to 63e, the upper slit 63a and the lower slit 63e are continuously provided with elongated holes 63a1 and 63e1 that are slightly wider in the vertical direction at positions near the left end 61b. . The long hole portions 63a1 and 63e1 function as guides by coming into contact with the outer periphery of an annular portion 71g provided in a support case 71 described later. Similarly, a long hole portion 63c1 that is slightly larger than the long hole portions 63a1 and 63e1 is continuously provided in the central slit 63c at a position near the left end portion 61b. It functions as a guide by coming into contact with the outer periphery of an annular portion 74a formed on a stopper member 74 described later.

  The support case 71 constituting the support part 70 is substantially box-shaped as described above, and an inverted U-shaped step part 71d is formed on the front surface of the plate part 71e constituting the bottom surface of the box with the same thickness in the front-rear direction. By forming, a case internal space Sc that can accommodate the left end 61 of the lumbar support main body 61 is formed inside these. A rectangular block-shaped slit guide 71f formed to the same thickness as the stepped portion 71d is formed on the right side of the case inner space Sc. The slit guide 71f is formed slightly smaller than the slits 63a to 63e of the lumbar support main body 61, and is disposed at a position corresponding to these, so that the lumbar support main body 61 is moved up and down via the inner edges of the slits 63a to 63e. It is possible to guide to restrain in the direction.

  In addition, two annular portions 71g described above are arranged on the front surface of the plate portion 71e, and are formed to have the same thickness as the stepped portion 71d. The annular portion 71g is used to attach a lid portion 72 described later, and as described above, is used to guide the long hole portions 63a1 and 63e1 provided in the slits 63a and 63e. A circular attachment hole 71 h is formed at a position slightly to the right of the center of the plate portion 71 e so that a small-diameter portion 73 a described later provided in the operation lever 73 can be inserted.

  Further, the support case 71 is substantially symmetrical with the back side of the left mounting end 71a in the drawing for mounting on the vertical rod 33B (see FIG. 11) with the back side of the right end 61a of the lumbar support main body 61 described above. It is in shape. That is, the back surface of the attachment end 71a is a tapered surface 71a1 along the flank 33c (see FIGS. 4 and 11) of the vertical rod 33B. In addition, screw insertion holes 71a2 and 71a2 are provided at two edges spaced apart from each other on the edge of the mounting end 71a, and a rectangular mounting piece 71b is formed so as to protrude rearward between them. ing. Furthermore, a protruding piece 71f protruding rearward is formed at a position closer to the inside of the tapered surface 71a1.

  The lid portion 72 attached to the support case 71 is a plate-like member having substantially the same outer shape as the stepped portion 71 d of the support case 71. The screw can be attached to the support case 71 by screwing a screw (not shown) into the central screw portion of the annular portion 71g provided in the support case 71 through the screw insertion holes 72a arranged above and below. . By attaching the lid 72 to the support case 71, these can cooperate to form a substantially flat surface. By doing so, unnecessary irregularities are avoided and the mesh ground 38 (see FIG. 1) is prevented from being caught or damaged.

  The support case 71 and the lid portion 72 constitute a support portion 70 that supports the left end portion 61b of the lumbar support main body 61 so as to be movable in the left-right direction within the range of the case internal space Sc.

  The support case 71 is provided with a stopper member 74 for restricting the displacement of the left end 61b of the lumbar support main body 61 in the left-right direction. The stopper member 74 is formed as a cam having a substantially rectangular plate shape, and a small diameter portion 74a protruding in the normal direction is provided at a position slightly inward in the longitudinal direction from the center. In addition, each corner is cut into an arc shape so that the stopper member 74 can rotate in the case internal space Sc. The stopper member 74 locks a stopper receiving portion 64 provided at the left end portion 61b of the lumbar support main body 61, and constitutes a restricting means Mr between them.

  In addition, an operation lever 73 is disposed on the back side of the support case 71, and the small diameter portion 73a provided in the operation lever is inserted through the mounting hole 71h provided in the plate portion 71e described above. Then, a screw 75 is screwed into a screw hole provided at the center of the small diameter portion 73a of the operation lever 73 via a screw insertion hole 74b provided in the small diameter portion 74a of the stopper member 74, whereby the plate portion 71e is inserted. In a sandwiched state, the stopper member 74 and the operation lever 73 can be integrated, and by rotating the operation lever 73, the direction of the stopper member 74 can be changed. When the knob 73c of the operation lever 73 is turned sideways, the stopper member 74 is rotated so that the long side is in the horizontal direction and the knob 73c is in the vertical direction, so that the stopper member 74 has the long side in the vertical direction. Become.

  FIG. 14 is an enlarged view of the attachment portion 76 formed on the vertical rod 33B (33) for attaching the lumbar support 6. As shown in FIG. The other vertical rod 33A (see FIG. 11) is also formed with the vertical rod 33B symmetrically, and the mounting portion 76 having the same shape is formed. Therefore, as an example, the vertical rod 33B (33) will be described as an example.

  An attachment portion 76 is formed on the vertical rod 33 in a first region R1 (see FIG. 2) that is curved so as to protrude forward. Moreover, the attaching part 76 is formed in the escape region Rc vicinity in the vertical hook 33 mentioned above. The attachment portion 76 has a shape obtained by cutting out a part of the front surface 33a and the flank 33c visible from the front side of the vertical rod 33, that is, from the front, specifically, a part of the flank 33c and the front surface. A very small portion of 33a is retracted to form a vertically long plane portion 76a that is substantially perpendicular to the front-rear direction. Inside the flat surface portion 76a, a rectangular groove portion 76c having a long side direction in the vertical direction is formed. In addition, screw holes 76b and 76b are provided at two locations on the upper and lower sides of the flat portion 76a. The position of the attachment portion 76 is formed so as to extend upward from a position where the back frame 31 is widest in the left and right directions as viewed from the front (see FIG. 3). Therefore, it can be said that the mesh base 38 is widest and the point where the mesh ground 38 is easily bent, and the support effect by attaching the lumbar support 6 is easily obtained.

  14 will be described in more detail with reference to FIG. 13. When the support case 71 is attached to the vertical rod 33B side, the attachment portion 76 in which the back surface of the attachment end 71a of the support case 71 is formed on the vertical rod 33B. The flat portion 76B is supported so as to be in contact therewith. At this time, the attachment piece 71b engages with the groove 76c, so that the attachment piece 71b can be firmly supported in the left-right direction. Then, by screwing screws (not shown) into the screw holes 76b and 76b through the two screw insertion holes 72a and 72a, the support case 71 can be firmly fixed in the front-rear direction. . When the support case 71 is attached to the vertical rod 33 in this way, as shown in FIG. 15, the inner side (right side in the drawing) of the support case 71 is more rearward (upper side in the drawing) than the front surface 33a of the vertical rod 33. It is inclined to move backwards. For this reason, the lumbar support main body 61 supported by the support case 71 naturally curves in the center toward the rear, so that the waist can be supported more gently when seated.

  Referring to FIG. 14 again with reference to FIG. 13, the attachment structure of the right end 61a of the lumbar support main body 61 and the vertical rod 33A (see FIG. 11) will be described. As described above, the attachment portion 76 in FIG. 14 is symmetrical with the vertical rod 33B. First, the back surface of the right end portion 61 a of the lumbar support main body 61 is supported so as to abut on the flat surface portion 76 B of the mounting portion 76. At this time, the mounting piece 61c is engaged with the groove 76c, so that it can be firmly supported in the left-right direction. Then, screws (not shown) are screwed into the screw holes 76b and 76b through the two screw insertion holes 61e and 61e, so that the right end 61a of the lumbar support main body 61 is firmly attached in the front-rear direction. Can be fixed. When the support case 71 is attached to the vertical rod 33 in this manner, as in the case of the support case 71, as shown in FIG. It is inclined so as to recede toward the rear (upper side in the figure), and the center of the lumbar support main body 61 can be curved backward.

  With the mounting structure as described above, the lumbar support 6 can be mounted within the relief region Rc of the vertical rod 33. Therefore, the lumbar support 6 does not interfere with the mesh ground 38 and maintains the surface uniformity of the mesh ground 38 so as not to affect the appearance.

  The entire lumbar support 6 can be easily removed from the back frame 31 by removing screws (not shown) from the screw holes 76b, 76b provided in the left and right vertical rods 33. Therefore, the lumbar support 6 can be omitted depending on the user's preference. The attachment portion 76 is provided on the front side as described above, and is not conspicuous because it is usually hidden by the mesh ground 38.

  Since the lumbar support 6 can be stabilized in position by being supported by the mesh ground 38, the lumbar support 6 is not sufficiently fixed without inserting the screw holes 76b, 76b provided in the left and right vertical rods 33. It will never be. Therefore, the lumbar support 6 can be attached later with the mesh ground 38 being carved. At this time, as described above, the entire vertical rod 33 is formed so as to extend in the direction orthogonal to the front surface 33a, that is, toward the rear, so that the rear of the mesh ground 38 is widely opened, The lumbar support 6 can be easily attached.

  Further, as shown in FIG. 16, when the lumbar support main body 61 is attached to the vertical rod 33A, the protruding piece 61f comes into contact with the inner side surface 33d of the vertical rod 33B. In this way, when the center of the lumbar support body 61 is bent so as to bend backward as the seated person leans against it, the projecting piece 61f tries to deform so as to spread outward, and this deformation is suppressed. A large pressing force is generated by being supported by the inner surface 33d. Therefore, the lumbar support main body 61 tries to return to the original shape by using the reaction force from the vertical rod 33B against the pressing force as a restoring force. Therefore, when the seated person leaves the seat, it can be easily restored and returned to the normal shape.

  A similar configuration is also provided on the support case 71 side as shown in FIG. 15, and the protruding piece 71 c comes into contact with the inner side surface 33 d of the vertical rod 33, thereby accompanying the bending of the lumbar support main body 61. Even if the support case 71 is deformed, the original position can be firmly restored.

  Here, based on FIG. 15, the effect | action of the support part 70 and the control means Mr is demonstrated. The support portion 70 is formed with a thin case inner space Sc in the front-rear direction, in which the left end 61b of the lumbar support main body 61 and the stopper member 74 are arranged in parallel. When a seated person leans down and the lumbar support main body 61 bends backward (upper side in the figure), the right end 61a (see FIG. 16) of the lumbar support main body 61 is fixed to the vertical rod 33. The left end 61b of the lumbar support main body 61 is displaced inward (rightward in the drawing) along the case internal space Sc. At this time, the stopper receiving portion 64 formed on the lumbar support main body 61 is locked to the stopper member 71 and the position is restricted, so that the bending amount is restricted so that the lumbar support main body 61 is not further deformed. .

  The case internal space Sc is formed with a dimension in the front-rear direction, that is, with a margin in the gap, so that the lumbar support main body 61 can move in the front-rear direction between the stopper member 74 and the inner surface 72 c of the lid portion 72. It has become. This dimension is preferably about 1 to 5 times the thickness of the center of the lumbar support body 61a. The left end portion 61b of the lumbar support main body 61 can be inclined rearward (upper side in the drawing) beyond the support case 71, and can be supported more flexibly by the amount of such movement in the front-rear direction. ing.

  In addition, when the lumbar support main body 61 is bent and a large inclination occurs, the left end 61b strongly contacts the inner surface 72c of the lid 72 and generates a pressing force. That is, the lid portion 72 functions as a regulating member that regulates the bending angle of the left end portion 61b, and can easily return to the original form by using the reaction force against the pressing force as a restoring force. Here, the bending angle of the left end 61b is an angle when the lumbar support main body 61 is bent and deformed, and is defined as a reference based on a free state to which no load is applied.

  FIGS. 17 and 19 illustrate how the amount of deformation that can be deformed is changed by operating the operation unit 73 to change the restriction amount of the lumbar support main body 61.

  FIG. 17A shows a state in which the lumbar support 6 is viewed from the rear, and the knob 73c of the operation unit 73 is positioned in the left-right direction. At this time, the stopper member 74 is in a state where the long side is directed in the left-right direction, and the distance m1 between the stopper member 74 and the stopper receiving portion 64 formed in the lumbar support main body 61 is relatively small. Therefore, the end portion 61b of the lumbar support main body 61 has a small movable distance, and is largely restricted.

  FIG. 17B shows a cross section at the position V1-V1 in FIG. In a normal state where a load in the front-rear direction is not applied to the lumbar support main body 61, the lumbar support main body 61 is subjected to a force for restoring to a planar state by its own rigidity. One end portion 61b of the lumbar support main body 61 is supported via a support case 71 that is attached so as to be inclined at an attachment angle θ with respect to the left-right direction, and the other end portion 61a is also the same. Is supported directly on the vertical rod 33A at an angle of Therefore, even when the lumbar support main body 61 is in a state where the stopper receiving portion 64 is not in contact with the stopper member 74, the lumbar support main body 61 is in a curved state such that the vicinity of the center protrudes rearward.

  18 (a) and 18 (b) show a state in which a load directed backward is applied to the entire lumbar support main body 61 from this state. The lumbar support main body 61 as a whole tends to bend toward the rear so that the center protrudes further. However, since the interval m1 between the stopper receiving portion 64 and the stopper member 74 is small, the restriction works greatly, and the belt-like body near the center in the vertical direction. The rearward displacement amount Δx11 at 62d (62c) is very small.

  At this time, although the tension in the left-right direction acts on the entire lumbar support main body 61, the restriction by the stopper member 74 acts greatly on the belt-like body 62d (62c) near the center in the up-down direction and is positioned above and below these. Since the strips 62a, 62b, 62e, and 62f are not directly restricted by the stopper member 74, the upper and lower ends 64a and 64b of the stopper receiving portion 64 are deformed so as to be displaced inward. That is, the peripheral portions of the belt-like bodies 62a, 62b, 62e, and 62f move in the left-right direction while undergoing elastic deformation as a deformation allowing portion Be (see FIG. 21) described later.

  Therefore, compared to the strips 62c and 62d near the center in the vertical direction, the strips 62b and 62e positioned above and below can bend further rearward, and the strips 62a and 62f positioned at the upper and lower ends are further rearward. It is possible to bend toward. FIG. 18B shows a comparison of the bent shape of the belt-like body 62d near the center in the vertical direction and the belt-like body 62f at the lowermost end. The belt-like body 62f at the lowermost end has a larger displacement amount Δx12 than that of the belt-like body 62d. Can be obtained. From this, it can be said that the upper and lower belt-like bodies 62a, 62b, 62e, and 62f can be appropriately deformed according to the external force while following the deformation of the belt-like bodies 62c and 62d near the center.

  The above operation example is a case where a substantially uniform force is applied to the lumbar support main body 61 in the vertical direction. When an extremely large force is applied to the upper side from the lower side, the upper side is conversely higher than the upper side. When an extremely large force is applied to the lower side, it behaves differently. That is, when a force acts exclusively on the upper belt-like bodies 62a and 62b, the upper belt-like bodies 62a and 62b are displaced rearward with the vicinity of the center in the vertical direction regulated by a large force by the stopper member 74 as a fulcrum. The lower strips 62e and 62f are displaced forward. Further, when a force is applied exclusively to the lower strips 62e and 62f, the lower strips 62e and 62f are displaced backward, but the upper strips 62a and 62b are displaced forward. . For this reason, when the seated person's waist is in contact with the lumbar support body 61, the lumbar support body 61 can change the position more appropriately and support the entire seated person's waist.

  FIG. 19A shows a state in which the knob 73c of the operation unit 73 is rotated to a downward position from the state of FIG. At this time, the stopper member 74 has a long side in the vertical direction and a short side in the horizontal direction. By doing so, the distance m2 from the stopper receiving portion 64 formed in the lumbar support main body 61 is increased. That is, the end portion 61b of the lumbar support main body 61 has a longer movable distance and a smaller restriction. However, even in this case, unless a load in the front-rear direction is applied to the lumbar support main body 61, the lumbar support main body 61 remains in its original position by its own rigidity as shown in FIG. Become.

  20A and 20B show a state in which a load directed backward is applied to the entire lumbar support main body 61 from this state. As shown in FIG. 20 (b), the lumbar support main body 61 can be greatly deflected rearward as compared with the case of FIG. 18 (b), and the flexure in the belt-like body 62d (62c) in the vicinity of the center in the vertical direction. Both the amount Δx21 and the deflection amount Δx22 of the upper and lower strips 62f (62a) can be larger than the initial deflection amounts Δx11, Δx12 (see FIG. 18). By doing so, it is possible to reduce the regulation of the waist by the lumbar support 6. Also in this case, the relationship between the strips 62a to 62f arranged above and below is the same, and the waist of the seated person can be appropriately supported by adjusting the positional relationship with each other.

  Further, since the regulating means Mr for regulating the amount of deflection of the lumbar support main body 61 is provided on the vertical rod 33B via the support portion 70, the lumbar support main body 61 bends substantially the entire left and right direction. It is possible to support the waist of the seated person in a wider range, and it is possible to improve comfort. Further, since the operation lever 73 for changing the amount of bending is similarly provided on the vertical rod 33B via the support portion 70, if the seated person extends his / her hand back while sitting, The operation can be easily performed, and it is possible to set the deflection amount according to the preference. In addition, the operation lever 73 can be operated by rotating the knob 73c so that the position of the knob 73c is changed between the inwardly facing state and the downwardly facing state. It can be said that it has.

  Furthermore, since the entire support portion 70 including the operation lever 73 and the restricting means Mr is provided at the end portion, coupled with the structure in which the mesh ground 38 (see FIG. 1) is attached to the back frame 31, When viewed, the area through which light passes is increased to give a sense of openness. Furthermore, since the support part 70 has a left-right asymmetric structure provided only on one vertical rod 33B (see FIG. 11), this is a structure that can be easily discriminated through the mesh ground 38. It is possible to present a characteristic appearance that gives a more sophisticated impression.

  Moreover, the lumbar support main body 61 in this embodiment has the characteristic shape which has arrange | positioned six strip | belt-shaped bodies 62a-62f in parallel with the up-down direction, as shown to Fig.21 (a). Hereinafter, the operation obtained by such a shape will be described.

  When the lumbar support main body 61 is viewed in detail, it can be seen that the strips 62a to 62f are sequentially connected by connecting portions 65a to 65f extending in the vertical direction. FIG. 21B schematically shows the lumbar support main body 61 separated into parts in the vertical direction. Each of the strips 62a to 62f functions as a body support part Bs for holding the body.

  Considering the two belt-like bodies 62c and 62d in the central portion, since the belt-like bodies 62c and 62d have stopper members 74 (see FIGS. 17 and 19) in their extending directions, The tension (arrow in the figure) generated by leaning acts in substantially the same direction as the extending direction. Therefore, the strips 62c and 62d are uniformly deformed according to the cross-sectional shape for holding the body as a whole, and can be bent evenly.

  On the other hand, it can be considered that the strips 62b and 62e arranged above and below the strips 62c and 62d are connected to the strips 62c and 62d via the connection portions 65b and 65e, respectively. . And it is thought that the tension (arrow in the figure) generated by the seated person leaning on as described above acts near the center, that is, the lower end of the connecting portion 65b or the upper end of the connecting portion 65e. Then, it does not act directly on the strips 62c and 62d constituting the body support part Bs, but acts around the connecting parts 65b and 65e. Therefore, the connection parts 65b and 65e can act as a deformation | transformation permission part Be, and can accept | permend the expansion-contraction in the left-right direction, ie, a position change, with respect to the center strip | belt bodies 62c and 62d. By doing so, the upper and lower belt-like bodies 62b and 62e are changed in the left-right direction as if they were expanded and contracted together with the connecting portions 65b and 65e with respect to the belt-like bodies 62c and 62d in the central portion, and appropriately The body can be held.

  Similarly, the strips 62a and 62f arranged above and below the strips 62b and 62e are connected to the central strips 62c and 62d via the connection portions 65a and 65b or the connection portions 65e and 65f, respectively. Can be seen. That is, it can be said that the larger deformation | transformation permission part Be which consists of connection part 65a, 65b or connection part 65e, 65f is provided. Accordingly, it is possible to allow greater lateral expansion / contraction, that is, position change, with respect to the central strips 62c and 62d.

  As described above, among the strips 62a to 62f, it can be said that the strips 62a, 62b, 62e, and 62f are provided with the deformation-permitting portions Be. It is possible for the whole body to support the body more stably by acting so that the whole supports the body widely without supporting the body.

  As described above, the chair according to the present embodiment is arranged on the back side of the pair of vertical rods 33A and 33B that constitute a part of the back frame 31 and the mesh ground 38 that is a tension member attached to the back frame 31. A right end 61a which is one end of a lumbar support main body 61 constituting the lumbar support 6 is fixed to one vertical rod 33A, and the lumbar support main body 61 is fixed to the other vertical rod 33B. A support portion 70 that supports the left end portion 61b that is the end portion so as to be movable in the left-right direction is provided, and the left end portion 61b of the lumbar support main body 61 is provided between the support portion 70 and the left end portion 61b of the lumbar support main body 61. The restriction means Mr for restricting the displacement in the left-right direction is configured, and the restriction amount of the displacement in the left-right direction of the left end portion 61b of the lumbar support main body 61 by the restriction means Mr is changed. The operation lever 73 is the ability of the operation unit is obtained by configured to provide to the support 70.

  Since it is configured in this manner, the left end 61b of the lumbar support main body 61 can be moved in the left-right direction without changing the vertical position, and the restriction amount of the relative displacement in the left-right direction can be changed. Thus, it is possible to effectively deform the entire lumbar support body 61 so as to support the waist in a wide range and obtain good waist support, and to provide an operation lever 73 for changing the amount of deformation of the support lever 73. It is possible to obtain good operability by providing the vertical rod 33 via 70.

  The restricting means Mr includes a stopper receiving portion 64 provided at the left end 61b of the lumbar support main body 61, and a stopper member 74 provided on the vertical rod 33B and locking the stopper receiving portion 64 in the left-right direction. Since the stopper member 74 is configured so that the position where the stopper receiving portion 64 is locked in the left-right direction can be changed by operating the operation lever 73, the stopper member 74 can move the stopper receiving portion 64 by operating the operation lever 73. By changing the locking position to the left and right, the amount of restriction of the left end 61b of the lumbar support main body 61 in the left and right direction can be easily changed, so that the lumbar support 6 can be appropriately bent according to the preference of the seated person. The amount can be changed.

  Furthermore, since the support portion 70 that supports the right end portion 61a and the left end portion 61b of the lumbar support main body 61 is configured to be inclined and provided on the vertical rods 33A and 33B, It is also possible to make the lumbar support main body 61 more easily deformed and to obtain better waist support.

  The support portion 70 includes a support case 71 that is a main body portion and a lid portion 72 that is a restriction member attached to the support case 71, and a gap in the front-rear direction formed by the support case 71 and the lid portion 72. The left end 61b of the lumbar support main body 61 is accommodated, and the left end 61b of the lumbar support main body 61 is configured to be movable in the left-right direction along the gap while the bending angle is restricted by the lid 72. Therefore, the support case 71 and the lid part 72 constituting the support part 70 function as a guide for the left end 61b of the lumbar support body 61, so that the lumbar support body 61 is restored to its original shape after being deformed. It is also possible to improve the appearance when a person is not seated.

  In addition, the right end 61a of the lumbar support main body 61 is fixed to the front surface side of the vertical rod 33A, and a protruding piece 61f that protrudes rearward on the inner side in the left-right direction of the right end 61a is formed. Since the projecting piece 61f is supported by the inner surface of the vertical rod 33A when deformed so as to bend rearward, the protruding piece 61f is formed on the vertical rod 33A by bending the lumbar support main body 61. A pressing force that presses the inner side surface 33d is generated, and this pressing force acts as a restoring force, so that the lumbar support main body 61 after the bending deformation can be more easily restored.

  In addition, since the upholstery is configured as the mesh ground 38, combined with the provision of the restricting means Mr of the lumbar support main body 61 in the vicinity of the vertical frame 33, the impression that the vicinity of the center of the chair is wide open. It is possible to produce a design that can be given and looks nice and light.

  Furthermore, since the lumbar support main body 61 is configured to be translucent, it is possible to further increase the above-described effect by further increasing the light transmittance in the front-rear direction of the chair.

  The specific configuration of each unit is not limited to the above-described embodiment.

  For example, in the above-described embodiment, the mesh ground 38 is used as the tension material. However, as long as it has elasticity that can be stretched on the frame body, the woven fabric, the nonwoven fabric, the film, and the like are not limited thereto. The sheet-like material can be used effectively.

  Also, as shown in FIGS. 22 and 23, the lumbar support main body 161 and the periphery of the attachment portion 176 of the vertical rod 133 can be modified. This lumbar support main body 161 has five strips 162a to 162e extending in the left-right direction arranged in parallel in the vertical direction, connecting the ends of the strips 162b to 162d near the center, and the back side A stopper receiving portion 164 is formed on the surface. Further, the upper and lower belt-like bodies 162a and 162e are provided with a reverse V-shaped elastic bent portion 166 that projects in the front-rear direction (backward direction in this example), and the end portions are connected to each other through a thin plate shape. It connects by the part 165, the back surface is made to contact | abut to the plane part 176a with which the attachment part 176 of the vertical shaft 133 is equipped, and it fixes using the screw penetration hole 165a and the screw hole 176b. The elastic bending portion 166 has a large expansion / contraction function like a spring, and can function as the above-described deformation allowing portion Be. An overhanging portion 177 is formed inwardly on the vertical rod 133, and the small-diameter portion 173a of the operating lever 173 and the stopper member 174 use the screw hole 173b through the insertion hole 177a provided therein. And can be fixed. The stopper member 174 has a long side direction and a short side direction. By changing the position of the knob 173c of the operation lever 173, the direction of the stopper member 164 is changed to change the amount of restriction of the stopper receiving portion 164, whereby the lumbar support body 161 is changed. Can be controlled. Of the five belt-like bodies 162a to 162e, the upper and lower 162a, 162e are provided with elastic bending portions 166 (deformation allowing portions Be) so that the entire lumbar support main body 161 widely supports the body. It has become

    Further, the structure of FIGS. 22 and 23 can be further simplified and modified as shown in FIG. In this example, the lumbar support main body 261 is configured by three belt-like bodies 262a to 262c extending in the left-right direction, and the upper and lower belt-like bodies 262a and 262c have elastic bent portions 266 (deformation allowable portions Be at the ends). ) And is further connected by a connection portion 265. The connecting portion 265 is provided with a screw hole 265a, which can be connected to the vertical rod 33 (see FIG. 11). The central belt-like body 262b can change the regulation amount of the central belt-like body 262b by operating a buckle 273 that is an operation unit. Specifically, the buckle 273 is rotatably attached by a fulcrum 265b provided at the connection part 265, and the end 262b1 of the belt-like body 262b is supported by the action point 273b provided at a position slightly away from the fulcrum. Has been. Further, the tip of the buckle 273 is configured as a force point 273c for operation. When the tip of the buckle 273 is directed to the left side in the figure, the regulation of the belt-like body 262b is reduced, and the tip of the buckle 273 is shown in the figure. When facing the right side, the belt-like body 262b is pulled in the right direction so that the restriction can be exerted greatly. Further, since the upper and lower belt-like bodies 262a and 262c are provided with elastic bent portions 166 (deformation allowing portions Be) at their ends, it is possible to widely support the body by adjusting their positions.

  In addition, when the lumbar support main body 61 described above is simplified as shown in FIG. 25A, it can be modified as shown in FIG. 25B based on this. The lumbar support main body 361 is formed by connecting the end portions of the strips 362a to 362d extending in the left-right direction by a connecting portion 365. The strips 362a to 362d are characterized in that the width direction at the center in the longitudinal direction is large and narrows toward the end. Therefore, the slits 363a to 363c between the strips 362a to 362d are formed so that the width in the center in the longitudinal direction is small and the width is increased toward the end. Each band-like body 362a to 362d functions as a body support part Bs that holds the body at the center part formed with a large width, and functions as a deformation-permitting part Be that allows expansion and contraction at the end part formed with a small width. In this way, the deformation allowing portion Be can be integrally provided continuously with the belt-like bodies 362a to 362d, and by doing so, all the belt-like bodies 362a to 362d can be expanded and contracted, that is, the position can be changed according to the above embodiment. In addition, the design can be improved by simplifying the appearance. Further, by forming the stopper receiving portion 364 in the portion accommodated in the support case 71, it is also possible to regulate the amount of bending as in the above-described embodiment.

  As shown in FIG. 26A, it is conceivable to configure the lumbar support main body 461. This is because the upper and lower ends of the connecting portions 465 and 465 extending in the vertical direction formed at both ends are connected by the second connecting portions 466 and 466 extending in the left-right direction, and the upper and lower portions extending between the second connecting portions 466 and 466 are connected. A number of strips 462 to 462 extending in the direction are arranged in parallel in the left-right direction. Each band-like body 462 is formed with a large central width and a small end width. Therefore, the center part of each belt-like body 462 functions as a body support part Bs, and the end part functions as a deformation allowing part Be that deforms so as to expand and contract in the vertical direction. By carrying out like this, several strip | belt-shaped bodies 462-462 arrange | positioned at right and left can mutually adjust length, and according to said embodiment, appropriate body holding | maintenance performance can be obtained over the whole left-right direction. .

  Furthermore, as shown in FIG. 26B, a lumbar support main body 561 may be configured. In this, connecting portions 565 and 565 extending in the vertical direction are arranged at both ends, and a band-like body 562a extending in the horizontal direction is formed so as to connect the centers in the vertical direction. Further, a belt-like body 562b extending in the vertical direction from the center of the belt-like body 562a is provided, and the belt-like bodies 562c, 562d, which circulate in a square shape by connecting the belt-like bodies extending in the vertical direction and the left-right direction in this way, 562e is formed. Each belt-like body 562c, 562d, 562e formed so as to circulate can be considered as a region extending in the left-right direction and a region extending in the up-down direction, and the body support part Bs and the deformation-permitting part, respectively. It can be understood as Be. Therefore, even if it is such a shape, the appropriate body holding | maintenance performance can be obtained widely over the whole lumbar support main body 561 according to said embodiment. In both cases of FIGS. 26A and 26B, the stopper receiving portions 464 and 564 are respectively formed in the portions accommodated in the support case 71, so that the amount of bending is the same as in the above-described embodiment. It is also possible to regulate this.

  Further, in the above-described embodiment, both the right end 61b of the lumbar support main body 61 and the support portion 70 that supports the left end 61b are inclined and provided on the vertical rods 33A and 33B. However, in order to facilitate the bending deformation of the lumbar support main body 61, only one of them may be inclined and provided. Furthermore, it is good also as a structure supported so that it can incline with respect to the vertical rods 33A and 33B so that it may be in an inclined state when the user is seated without being fixed in an inclined state.

  Further, in the above-described embodiment, the lumbar support main body 61 is configured to be translucent to increase the light transmission in the front-rear direction of the chair and enhance the open feeling. However, the completely transparent material May be used.

  Other configurations can be variously modified without departing from the spirit of the present invention.

6 ... Lumbar support 31 ... Back frame 33, 33A, 33B ... Vertical rod 33f ... Inside surface 34 ... Upper frame (horizontal)
35 ... Lower frame (Yokohama)
38 ... Mesh (tension)
61 ... Lumbar support body 61a ... Right end (one end) of (lumbar support)
61b ... Left end (other end) of (lumbar support)
61f ... projecting piece 64 ... stopper receiving part 70 ... support part 71 ... support case (main part)
72 ... Lid (regulating member)
73. Operation lever (operation unit)
74: Stopper member Mr: Restricting means

Claims (7)

A pair of downspouts forming part of the back frame;
And a lumbar support arranged on the back side of the tension member attached to the back frame,
One end of the lumbar support main body constituting the lumbar support is fixed to one vertical rod, and the other end of the lumbar support main body is formed with a stopper receiving portion protruding rearward on the other vertical rod. A support portion having a stopper member formed as a cam that is supported in such a manner as to be movable in the left-right direction while being constrained in a direction and that is in contact with a part of the stopper receiving portion is provided, and the other end portion of the support portion and the lumbar support body A restricting means for restricting the displacement in the left-right direction toward the one end of the other end of the lumbar support body between the stopper receiving part and the stopper member, and the lumbar by the restricting means An operating portion that can change the restriction amount of the displacement of the other end portion of the support body in the left-right direction by rotating the stopper member. Provided part, one end portion of the lumbar support body, and a chair in which at least one of the support portion for supporting the other end, characterized in that provided on the inclined or tiltable Tate杆rearwardly .   The restricting means includes a stopper receiving portion provided at the other end portion of the lumbar support main body, and a stopper member provided on the vertical rod and locking the stopper receiving portion in the left-right direction. 2. The chair according to claim 1, wherein a position where the stopper receiving portion is locked is changed in a left-right direction by an operation of rotating the stopper member of the operation portion. A pair of downspouts forming part of the back frame;
And a lumbar support arranged on the back side of the tension member attached to the back frame,
One end of the lumbar support main body constituting the lumbar support is fixed to one vertical rod, and the other end of the lumbar support main body is formed with a stopper receiving portion protruding rearward on the other vertical rod. A support portion having a stopper member formed as a cam and supporting the lumbar support main body and the other end portion of the lumbar support main body. A restricting means for restricting displacement in the left-right direction toward the one end side of the end portion is constituted by the stopper receiving portion and the stopper member, and in the left-right direction of the other end portion of the lumbar support main body by the restricting means. An operation portion that can change the amount of displacement control by rotating the stopper member is provided in the support portion, and the lumbar support One end portion of the body is fixed to the front side of the downspout, and a protruding piece that protrudes rearward is formed on the inner side in the left-right direction of the one end portion, and the center of the lumbar support main body is deformed to bend rearward. In this case, the projecting piece is configured to be supported by the inner surface of the downspout.   The support portion includes a main body portion to which the stopper member is attached and a restricting member attached to the main body portion, and the other end of the lumbar support main body is disposed in a front-rear gap formed by the main body portion and the restricting member. The other end portion of the lumbar support main body is configured to be movable in the left-right direction along the gap while the deflection angle is regulated by the regulating member. A chair according to any one of the above.   One end of the lumbar support main body is fixed to the front side of the vertical rod, and a protruding piece protruding rearward is formed on the inner side in the left-right direction of the one end, and the center of the lumbar support main body is bent rearward. The chair according to claim 1 or 2, wherein the projecting piece is configured to be supported by an inner side surface of the downspout when deformed so as to be deformed.   The chair according to any one of claims 1 to 5, wherein the upholstery is a mesh fabric.   The chair according to claim 6, wherein the lumbar support body is transparent or translucent.

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