JP5453632B2 - Chair - Google Patents

Description

  The present invention relates to a chair provided with a lumbar support so as to support a waist of a seated person.

Conventionally, various chairs configured to support a seated person's waist are known. As an example of such a chair, for example, a backrest is provided with a core made of an elastic material, and the core material is elastically deformed by raising and lowering a lower end portion of the backrest, thereby supporting a waist of a seated person. It is considered that a portion functioning as a lumbar support portion is configured to project and retract in the front-rear direction and the vertical direction (see, for example, Patent Document 1).
JP 2003-284616 A

  By the way, in the chair of composition of patent documents 1, although the part which functions as a lumbar support part is certainly constituted so that it can project and sink toward the front and back and the up-and-down direction, this lumbar support part is an up-and-down direction position. Regardless of whether it protrudes toward the front.

  On the other hand, depending on the seating posture and the like, the lumbar support part may not necessarily support the waist of the seated person in a state where the lumbar support part protrudes toward the front, and there is a desire to be able to change the protruding direction of the lumbar support part. . Such a demand is particularly remarkable in a chair in which the backrest can be tilted backward. However, as described above, with the configuration described in Patent Document 1, it is difficult to meet such a demand.

  The present invention solves such a problem, and enables the lumbar support to support the waist of the seated person in a desired posture even when the seating posture is changed, such as when the backrest is tilted backward. For the purpose.

That chair according to the present invention is to be able to detachably mount the lumbar support to the front of the back plate, said lumbar support is a lumbar support body for supporting the lumbar region of the seated person, the spine An upper and lower guide member that is detachably mounted on the front surface of the plate and guides the lumbar support body so that the lumbar support body can move up and down in synchronization with the direction of the front surface of the back plate, However, the back plate includes a protruding portion in which the front surface protrudes most forward and includes a chair mounted on the top and bottom of the chair. The back plate has a plurality of holes at least in the vicinity of the protruding portion. And the upper and lower guide members are mounted on the back plate selectively using any of the holes .

  In such a case, by moving the lumbar support main body up and down, it is possible for the lumbar support main body to adopt not only a front-facing posture but also an upward posture and a downward posture.

Further, the back plate has a plurality of holes at least in the vicinity of the protruding portion, and the vertical guide member is mounted on the back plate selectively using any of the holes , The lumbar support mounting position can be changed in order to more suitably support the seated person's waist.

  In particular, if the vertical guide member is flexible enough to contact the front surface of the back plate, the vertical guide member is attached to the back plate regardless of the mounting position of the vertical guide member. It can be attached to the front of the.

  As an example of the configuration of a back plate that can suitably realize such an attachment mode of the vertical guide member, the back plate includes a mesh region and a shell region having no hole, and the hole is the For forming a mesh region.

  In particular, if the shell region is a horizontal belt, and a shell region that forms a band in the protruding portion, and mesh regions above and below the shell region, respectively, Since the shell region is arranged at the protruding portion, the load of the seated person is received by the shell region, and the seated person can be given a feeling of holding by the lumbar support.

  According to the configuration of the chair according to the present invention, the lumbar support main body is moved up and down while being guided by the vertical guide member that is mounted on the top and bottom of the back plate including the protruding portion where the front surface of the back plate protrudes most forward. Thus, the lumbar support main body can take any of the upward posture, the front-facing posture, and the downward posture. Therefore, even when the seating posture is changed, such as when the backrest is tilted backward, the seated person's waist can be supported by the lumbar support in the seater's desired posture.

  Hereinafter, an embodiment in which the present invention is applied to a synchro tilt type office rotary chair 100 will be described with reference to the drawings.

  As shown in FIGS. 1 to 3, the chair 100 includes a leg 1, a support base 2 that is supported on an upper part of the leg 1 and can be turned horizontally, and a seat receiver 3 disposed on the support base 2. The seat support 3 is provided with a seat 4, a back support 5 provided on the support base 2 so as to be able to tilt backward, and a backrest 6 attached to the back support 5. .

  The leg 1 includes a leg base 11 and a leg support 12 provided at the center of the leg base 11. The leg base 11 is formed by radially projecting leg blades 11b from a hub 11a provided at the center, and a caster 11c is provided at the tip of the leg blade 11b. The leg struts 12 are mainly composed of gas springs, and are normal ones that can elastically extend in the vertical direction and can be locked at a desired position.

  The support base 2 includes a housing 21 attached to an upper end portion of the leg support 12, a main shaft 22 that is rigidly connected to the housing 21 and supports the back support 5 so as to be able to tilt backward, and the housing 21 A tilting reaction force generation mechanism (not shown) that is provided and generates a repulsive force with respect to the backward tilting operation of the back support 5 is provided. Since the tilt reaction force generation mechanism is a normal one using a coil spring, a gas spring, or the like, description thereof is omitted.

  The seat receiver 3 is a shell-shaped member that holds the seat 4, and its front end side is attached to the support base 2 so as to be movable back and forth, and its rear end side is supported by the base end portion of the back support 5. Has been.

  The back support 5 includes a back support rod 51 that is supported on the main shaft 22 of the support base 2 so as to be able to tilt backward, and an elastic horizontal flange 52 attached to the upper end portion of the back support rod 51. Become. The back support rod 51 includes a lower back frame 51b having a base end attached to the support base 2, and an upper back frame 51a coupled to the tip of the lower back frame 51b. The lower back frame 51 b is made of metal, and the outside thereof is covered with a cover 53. The outer surface of the cover 53 is positioned so as to be continuous with the outer surface of the upper back frame 51a. The upper back frame 51a is integrally formed of a synthetic resin, and the upper part of the upper back frame 51a is bifurcated to form a branch collar 51a2. This branch collar 51a2 stands up substantially linearly. The elastic horizontal bar 52 has a leaf spring shape in which two intermediate portions are supported via an attachment shaft (not shown) pivotally connected to the upper end of the back support bar 51, more specifically, the upper end of each branch bar 51a2. The backrest 6 is supported at both ends thereof.

  The backrest 6 is mainly composed of a back plate 61. The back plate 61 includes a back plate main body 61a, side end attachment portions 61c provided on both right and left sides of the back plate main body 61a, and a lower end attachment portion 61b provided on a lower end portion of the back plate main body 61a. Thus, the side end attaching portion 61 c is connected to both end portions of the elastic horizontal bar 52, and the lower end attaching portion 61 b is attached to the lower back frame 51 b of the back support rod 51. The back plate body 61a is made of a synthetic resin, and includes a peripheral frame portion 61a1 having no hole 61d and an intermediate surface portion 61a2 surrounded by the peripheral frame portion 61a1. The intermediate surface portion 61a2 includes a resin mesh region M having a plurality of holes 61d and a resin shell region S having no holes 61d, and the resin mesh regions M and the resin shell regions S are alternately arranged. doing. Specifically, the resin shell region S of the intermediate surface portion 61a2 has a horizontal belt shape and is arranged so as to connect the opposing portions of the peripheral frame portion 61a1. A plurality of the resin shell regions S having a belt shape are arranged in parallel in the vertical direction, and the resin mesh is formed between the resin shell regions S and between the resin shell region S and the peripheral frame portion 61a1. Regions M are formed respectively. The resin mesh region M is formed thinner than the resin shell region S and has a large number of holes 61d. The front surface of the resin shell region S and the front surface of the resin mesh region M are formed flush with each other. Further, the back surface of the resin mesh region M is provided to be recessed from the back surface of the resin shell region S. On the other hand, a step portion 61a3 is formed at the boundary between the front surface of the peripheral frame portion 61a1 and the intermediate surface portion 61a2. In other words, the intermediate surface portion 61a2 protrudes forward from the peripheral frame portion 61a1 with the step portion 61a3 as a boundary. Here, in the present embodiment, the resin shell region S having a band shape is disposed on the protruding portion 61x, which is the portion where the front surface of the back plate 61 protrudes most forward. In the present embodiment, an exterior material 62 can be attached in front of the back plate 61. The exterior material 62 includes an exterior material body 62 a having a tension fabric forming a front surface of the backrest 6 and a cushion disposed between the tension fabric and the back plate, and the exterior material 62 is locked to the back plate 61. An upper edge attaching portion 62b for engaging with the edge portion, that is, the upper edge portion, and a lower edge attaching portion 62c for engaging the exterior member with the lower edge portion of the back plate are provided. In addition, in FIG.1 and FIG.2, this exterior material 62 is shown with the imaginary line. FIG. 3 shows a perspective view of the state where the exterior material 62 is removed.

  As shown in FIGS. 3 and 4 to 8, the lumbar support 7 can be detachably attached to the front surface of the back plate 61.

  As shown in FIG. 4 which is an exploded perspective view of the lumbar support 7, and as shown in FIG. 5 which is a cross-sectional view of a mounting portion of the lumbar support 7, the lumbar support 7 supports the lumbar portion of the seated person. A support main body 71, and a vertical guide member 72 that is detachably attached to the front surface of the back plate 6 and guides the lumbar support main body 71 so that the direction of the lumbar support main body 71 can be moved up and down in synchronization with the direction of the front surface of the back plate 61; It comprises.

  Specifically, the lumbar support main body 71 includes an inner plate 71a and a support pad 71b attached to the front surface of the inner plate 71a. The inner plate 71 a is provided with handles 71 a 1 that extend outward from the left and right ends of the exterior material 62 of the backrest 6 at both left and right ends thereof. The support pad 71b is attached in front of a portion between the left and right handles 71a1.

  On the other hand, the upper and lower guide members 72 are a pair of left and right members that include a protruding portion 61x in which the front surface of the back plate 61 protrudes forward most and is mounted over the upper and lower portions. The vertical guide member 72 is attached to the back plate 61 by selectively using one of the holes 61 d of the back plate 61. Further, the vertical guide member 72 is a member made of, for example, resin having flexibility enough to be in contact with the front surface of the back plate 61.

  More specifically, the vertical guide member 72 has an upright portion 72a that protrudes forward from the front surface of the back plate 61, and a side opposite to the side toward the center in the width direction of the back plate 61 from the protruding end of the upright portion 72a. And a retaining claw portion 72b that extends. Further, female screw holes 72a1 are vertically spaced apart from each other on the back surface of the upright portion 72a of the vertical guide member 72, and are provided at a plurality of locations, specifically at two locations. Then, in a state where the vertical guide member 72 is shaped along the front surface of the backrest 6, the female screw hole 72 a 1 and the hole 61 d of the back plate 61 are overlapped to form a male screw member 72 c as a fixture from the back of the back plate 61. The upper and lower guide members 72 are attached to the back plate 61 by screwing them into the female screw holes 72a1. Here, in this embodiment, a pedestal 72d having a screw passage hole 72d1 through which the male screw member 72d is inserted is disposed between the back surface of the back plate 61 and the head of the male screw member 72c.

  On the other hand, the lumbar support main body 71 is provided with guided claw portions 71c which are engaged with the vertical guide member 72 and provided in a pair on the left and right sides on the back surface thereof, more specifically on the back surface of the inner plate 71a. The guided claw portion 71c includes an upright portion 71c1 that protrudes rearward from the back surface of the lumbar support main body 71, and a retaining portion 71c2 that extends from the protruding end of the upright portion 71c1 toward the widthwise center of the lumbar support 71. It has. Then, the retaining portion 71c2 of the guided claw portion 71c is engaged with the retaining claw portion 72b of the vertical guide member 72 so that the lumbar support main body 71 can be moved up and down to the back plate 61 via the vertical guide member 72. Retained. In the present embodiment, the guided claw portions 71c are provided in a plurality of pairs, specifically two pairs, spaced apart in the vertical direction.

  The lumbar support 7 is attached to the back plate 61 as follows.

  First, as shown in FIG. 4, the vertical guide member 72 is disposed along a portion straddling up and down across the protruding portion 61 x on the front surface of the back plate 61. Next, the vertical guide member 72 is deformed so that the entire back surface of the vertical guide member 72 is substantially or completely in contact with the front surface of the back plate 61. Then, the female screw hole 72a1 of the vertical guide member 72, one of the holes 61d of the back plate 61, and the screw passage hole 72d1 of the pedestal 72d are superposed, and the male screw member 72c is inserted into the female screw hole 72a1 from the rear of the back plate 61. The upper and lower guide members 72 are attached to the front surface of the back plate 61 by screwing. Then, the retaining claw portion 72b of the vertical guide member 72 and the retaining portion 71c2 of the guided claw portion 71c on the back of the lumbar support main body 71 are engaged with each other. That is, the retaining portion 71 c 2 of the guided claw portion 71 c of the lumbar support main body 71 is positioned between the retaining claw portion 72 b of the vertical guide member 72 and the front surface of the back plate 61.

  The vertical position of the lumbar support main body 71 is changed by moving the lumbar support main body 71 up and down while holding the handle 71a1. At this time, if the lumbar support main body 71 is moved to the left or right, the retaining portion 71c2 of the guided claw portion 71c hits the vertical guide member 72, so that the movement of the lumbar support main body 71 to the left and right positions is restricted. Then, the moving direction of the lumbar support main body 71 is guided. That is, in FIG. 6 schematically showing the back plate 61 and the lumbar support 7, the lumbar support main body 71 is movable in the arrow X direction or the arrow Y direction.

  Here, as described above, the orientation of the lumbar support main body 71 changes in synchronization with the orientation of the front surface of the back plate 61. That is, when the height position of the lumbar support main body 71 and the height position of the protruding portion 61x of the back plate 61 coincide with each other, the lumbar support 7 faces the front as shown in FIG. . At this time, as described above, since the resin shell region S is arranged in the protruding portion 61x, the lumbar support main body 71 is supported by the resin shell region S. That is, the load from the seated person is received by the resin shell region S of the back plate 61 via the lumbar support main body 71. On the other hand, when the lumbar support main body 71 is located above the protruding portion 61x of the back plate 61, the lumbar support 7 faces upward as shown in FIG. When the lumbar support main body 71 is positioned below the protruding portion 61x of the back plate 61, the lumbar support 7 faces downward as shown in FIG.

  As described above, according to the configuration of the chair 100 according to the present embodiment, the lumbar support 7 is detachably attached to the front surface of the back plate 61 and the lumbar support main body 71 is oriented on the front surface of the back plate 61. An upper and lower guide member 72 is provided to guide the upper and lower guide member 72 so that it can move up and down in synchronization with the direction. The upper and lower guide member 72 includes a protruding portion 61x in which the front surface of the back plate 61 projects most forward. The lumbar support main body 71 is moved up and down so that the lumbar support main body 71 has an upward posture as shown in FIG. 7, a front-facing posture as shown in FIG. It is possible to adopt any of the downward postures as shown in FIG. That is, even when the seating posture is changed, such as when the backrest 6 of the chair 100 is tilted backward, the lumbar support 7 can support the lumbar portion of the seated occupant in a desired posture of the occupant. it can.

  Further, the back plate 61 has a plurality of holes 61d in the vicinity of the protruding portion 61x, and the vertical guide member 72 is attached to the back plate 61 by selectively using any of the holes 61d. Therefore, the mounting position of the lumbar support 7 can be changed in order to more suitably support the seated person's waist.

  Further, since the vertical guide member 72 is flexible enough to be able to contact the front surface of the back plate 61, the vertical guide member 72 can be moved regardless of the mounting position of the vertical guide member 72. It can be attached to the front surface of the back plate 61.

  Further, since the back plate 61 includes a resin mesh region M in which a large number of the holes 61d are formed and a shell region S that does not have the holes 61d, such a well-known back plate is provided. Without adding a significant design change to 61, it is possible to suitably realize the mounting mode of the vertical guide member 72.

  The resin shell region S has a horizontal belt shape, and a band-shaped resin shell region S is disposed on the protruding portion 61x, and resin meshes are respectively provided above and below the resin shell region S. Since the region M is disposed, the load of the seated person is received by the resin shell region S as described above, and a feeling of holding by the lumbar support 7 can be given to the seated person.

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

  For example, in the above-described embodiment, the upper and lower guide members are attached using holes provided in the resin mesh region of the back plate, but the holes for attaching the upper and lower guide members to the back plate having no mesh hole. And the vertical guide member may be attached using this hole. Moreover, you may connect an up-and-down guide member to a back board using a wood screw etc. from the back of plate-like back boards, such as a wooden board. In this case, the most significant effect of the present invention can be obtained if the vertical guide member is attached to the upper and lower sides including the protruding portion, and therefore the vertical position may not necessarily be changeable. Here, when the vertical position of the vertical guide member is not changeable, the vertical guide member does not have to be flexible.

  In addition, in the above-described embodiment, the back plate adopts a configuration having a shell region having a horizontal band shape and a mesh region arranged above and below the shell region. The shape is not limited to this. For example, the shell region may be vertical or inclined, and a plurality of circular mesh regions may be arranged, and the remaining portion may be defined as the shell region. You may employ | adopt the structure to do.

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

The perspective view which shows the chair which concerns on one Embodiment of this invention. The side view which shows the chair which concerns on the same embodiment. The perspective view which shows the state which removed the surface covering material of the chair which concerns on the embodiment. The disassembled perspective view which shows the attachment aspect of the lumbar support of the chair which concerns on the embodiment. The principal part cross-sectional view which shows the attachment aspect of the lumbar support of the chair which concerns on the embodiment. The figure which shows schematically the attachment attitude | position of the lumbar support of the chair which concerns on the same embodiment. The figure which shows schematically the attachment attitude | position of the lumbar support of the chair which concerns on the same embodiment. The figure which shows schematically the attachment attitude | position of the lumbar support of the chair which concerns on the same embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Chair 61 ... Back board 61x ... Projection part 7 ... Lumber support 71 ... Lumber support main body 72 ... Vertical guide member

Claims (4)

In front of the back plate and to be able to mount the lumbar support detachably said lumbar support includes a lumbar support body for supporting the lumbar region of the seated person, removably mounted on the front surface of the back plate And a vertical guide member that guides the lumbar support main body so that the direction of the lumbar support body can be moved up and down in synchronization with the direction of the front surface of the back plate. A chair that includes a protruding portion that protrudes forward and is mounted over the top and bottom thereof ,
The back plate has a plurality of holes at least in the vicinity of the protruding portion, and the upper and lower guide members are attached to the back plate selectively using any of the holes. A chair characterized by. The chair according to claim 1 , wherein the vertical guide member is flexible enough to attach to the front surface of the back plate . The chair according to claim 1 or 2 , wherein the back plate includes a mesh region and a shell region having no hole, and the hole is for forming the mesh region . The chair according to claim 3, wherein the shell region has a horizontal band shape, and a belt-like shell region is arranged at the protruding portion, and mesh regions are arranged above and below the shell region, respectively .

Images