JP6695218B2 - Backrest, lumbar support, and chair - Google Patents

Description

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

  As described in Patent Document 1, a backrest is provided in front of a backrest support frame standing upright from a rear portion of a seat surface, and the backrest holds a net-shaped tension material and a back frame that holds an outer peripheral portion of the tension material. And a lumber support provided at the rear of the upholstery material are known. In this configuration, the lumbar support extends upward from the lower portion of the back frame and is attached to the lumbar support support portion formed integrally with the back frame.

  In such a chair, if an attempt is made to make the lumber support an optional member that can be installed on the chair or not, even if the lumbar support is not installed, the lumbar support provided integrally with the back frame is provided. The supporting part remains and the appearance is impaired.

On the other hand, as shown in, for example, Patent Document 2, both ends of the lumbar support in the width direction are detachably supported on side frame rods provided on both left and right sides of the back frame via a pair of left and right holding members. Chairs with different configurations have been proposed.
In the chair of this configuration, the holding member supporting the end portion of the lumbar support is attached to the side frame rod by fitting the convex portion provided on each holding member into the recess formed in the side frame rod. It is removable.

Japanese Patent No. 4133067 Japanese Patent No. 5823818

  However, in the configuration disclosed in Patent Document 2, the recess formed in the side frame rod is formed so as to be recessed rearward from the side of the side frame rod facing the front tension member. Therefore, in order to mount the holding member on the side frame rod, after inserting the holding member into the gap between the tensioning member and the side frame rod, the holding member is pushed rearward so that the convex portion of the holding member is attached to the side frame rod. Must fit into recess. Since the front-rear gap between the upholstery member and the side frame rod is small, there is room for improvement in workability when mounting such a holding member.

Such a problem is common not only to the lumbar support but also to the case of mounting other optional members on the backrest.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a backrest, a lumbar support, and a chair that can improve workability when attaching an optional member such as a lumbar support to the backrest. And

The present invention adopts the following means in order to solve the above problems.
The backrest according to the present invention is a tension member formed with a load supporting surface for receiving a load of a seated person, a frame member that supports an outer peripheral end portion of the tension member, and the frame member. On the other hand, a mounted portion facing the load supporting surface in a direction intersecting with the load supporting surface is provided, and an option member attachable to and detachable from the mounted portion, wherein the option member is in a direction along the load supporting surface. And a mounting portion fixed to the mounted portion by extending into the gap between the upholstery member and the mounted portion.

  According to this structure, the attached portion facing the tension member is provided on the frame member, and the attachment portion of the optional member is inserted into the gap between the tension member and the attachment portion and fixed. did. Therefore, when the optional member is mounted on the frame member, the mounting portion of the optional member may be inserted into the gap between the tension member and the mounted portion from the direction along the load supporting surface of the tension member, which facilitates the work. Can be done.

In the backrest according to the present invention, in the backrest, the attached portion may protrude from the frame member along the load supporting surface.
With this configuration, the attachment portion of the optional member is inserted and fixed in the gap between the attachment portion protruding from the frame member along the load supporting surface and the tension member. As a result, when the backrest is viewed from the side opposite to the tension member with respect to the frame member, the mounting portion of the optional member is covered by the mounted portion of the frame member, and the appearance is improved.

Further, the backrest according to the present invention is such that, in the backrest, the frame member is provided with a concave portion that accommodates the attachment portion on a side facing the tension member with respect to the attachment portion. Good.
According to such a configuration, by housing the mounting portion in the recess, it is possible to suppress the mounting portion of the option member from being exposed to the outside and improve the appearance.

Further, a backrest according to the present invention is characterized in that, in the backrest, the optional member is arranged on a side separated from the first member having the attachment portion and the attached portion from the tension material. Two members, a connecting member that connects the first member and the second member in a state in which the attached portion is sandwiched between the attaching portion of the first member and the second member, May be.
In this way, by connecting the first member and the second member with the connecting member in a state where the first member, the mounting portion, and the second member sandwich the mounted portion, the frame member is mounted on the mounted portion. On the other hand, the optional member can be firmly attached.

In the backrest according to the present invention, in the backrest, the optional member may be a lumbar support.
According to such a configuration, when the lumbar support is mounted on the backrest, the mounting portion is inserted in the gap between the tension material and the attachment portion from the direction along the load supporting surface of the tension material. Well, the work of mounting the lumbar support can be easily performed.

  Further, the lumbar support according to the present invention supports a tension member having a load supporting surface for receiving a load of a seated person and an outer peripheral end portion of the tension member, and supports the tension member on the load supporting surface. A frame member having attached portions facing each other and spaced apart in the intersecting direction, and being attachable to and detachable from the backrest, extending in the direction along the load supporting surface and extending between the tension material and the attached portions. It is characterized by comprising a mounting portion that is inserted into the gap and fixed to the mounted portion, and a lumbar support body that is supported by the mounting portion and that is disposed behind the upholstery member.

  With this configuration, when the lumbar support is mounted on the backrest, the mounting portion can be inserted into the gap between the tension material and the mounted portion from the direction along the load supporting surface of the tension material. Well, the work of mounting the lumbar support can be easily performed.

The chair according to the present invention includes a support structure installed on the floor, a seat supported by the support structure, and a backrest according to any one of the above, which is supported by the support structure. It is characterized by including.

  According to such a chair, when attaching an optional member such as a lumbar support to the backrest, the mounting portion is provided with a gap between the tension material and the mounted portion from a direction along the load supporting surface of the tension material. It suffices to insert the optional member, and the work of mounting the optional member can be easily performed.

  According to the backrest, the lumbar support, and the chair according to the present invention, it is possible to improve workability when attaching an optional member such as a lumbar support to the backrest.

It is the perspective view which looked at the chair concerning one embodiment of the present invention from the side. It is the perspective view which looked at the chair concerning one embodiment of the present invention from the back (back side). It is a perspective sectional view showing a mounting structure of the lumbar support to the back frame. It is a perspective development view showing the composition of the lumbar support attached to the back frame. It is the perspective view which looked at the 1st bracket and the 2nd bracket from the slanting front. It is the perspective view which looked at the 2nd bracket from the slanting back. It is the figure which carried out the cross-sectional view of the second bracket along the center of the width direction of the slit.

Hereinafter, a chair according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a chair according to an embodiment of the present invention viewed from a side. FIG. 2 is a perspective view of the chair according to the embodiment of the present invention as seen from the rear side (backrest side).

As shown in FIGS. 1 and 2, the chair 100 includes a leg 1 installed on the floor surface F, a box-shaped support base 2 (not shown) installed on the upper portion of the leg 1, and a support base. 2, a seat receiving member 3 attached to the upper portion of the seat 2, a seat body 4 slidably supported by the seat receiving member 3 on which a seated person sits, and a back of the seated person who extends from the support base 2 and sits on the seat body 4 is supported. It is equipped with a backrest 7 to do.
In the following description, for convenience, the direction in which the occupant seated on the seat body 4 faces forward is referred to as “front” and the opposite direction is referred to as “rear”. Further, a direction connecting the floor surface F side where the chair 100 is installed and the opposite side is referred to as “up and down direction”. Further, the width direction of the chair 100, that is, the horizontal direction orthogonal to the front-rear direction is referred to as the “width direction”. Further, in the figure, the front side is indicated by an arrow FR, the upper side is indicated by an arrow UP, and the left side is indicated by an arrow LH.

  The leg 1 has a multi-leg 11 with casters 11A and a pedestal 12 that stands upright from the center of the multi-leg 11 and that houses a gas spring (not shown) that is a lifting mechanism.

  The outer cylinder 13 that constitutes the lower portion of the pedestal 12 is non-rotatably fitted to and supported by the multi-leg 11. The inner cylinder 14 that constitutes the upper part of the pedestal 12 has the support base 2 fixedly supported at the upper end thereof, and the lower part thereof is supported rotatably in the horizontal direction by the outer cylinder 13.

  The support base 2 has a built-in lifting mechanism for a pedestal 12 and a tilting mechanism for a backrest 7.

The seat receiving member 3 includes four link arms (not shown; the same applies below) attached to the upper part of the support base 2 and a pair of left and right fixed frames (not shown. The same applies below) connecting the link arms. ,have.
In the present embodiment, the leg 1, the support base 2, and the seat receiving member 3 constitute the support structure 30.

  The seat body 4 includes a seat frame 40 and a seat surface tension member 41 stretched around the seat frame 40. The upper surface of the seat upholstery member 41 is a seat portion load supporting surface 41f that receives the load of the seated person.

  The backrest 7 includes a back frame 70 and a tension material 71 stretched around the back frame 70. The front surface of the upholstery material 71 is a load supporting surface 71f that receives the load of the seated person.

  The back frame 70 has a rear frame 70B that is connected to the support base 2 and is a strength member that bears the strength of the back frame 70, and a back front frame (frame member) 80F provided in front of the back frame 70B. ing.

  The rear frame 70B has a lower side portion 72, a side side portion 73, and an upper side portion 74. The lower side portion 72, the side side portion 73, and the upper side portion 74 are integrally formed of, for example, a metal such as aluminum or a resin having a predetermined strength.

  The lower side portion 72 is connected to the tilt adjusting mechanism in the support base 2 and extends from both left and right sides of the rear portion of the support base 2. The lower side portion 72 is gradually inclined rearward as it goes upward. Further, each lower side portion 72 is provided with an armrest 75 arranged laterally of the seat body 4.

  Side edges 73 are continuously formed at the upper end of each lower edge 72. Each side portion 73 is gradually inclined outward in the width direction as it goes upward.

  The lower portion 73a of the side portion 73 is gradually inclined forward as it goes upward. The upper part 73b of the side part 73 is gradually inclined rearward as it goes upward. The upper portions 73b of the side portions 73 are connected to each other by the upper portion 74.

  The front back frame 80F includes a pair of vertical rods 81 spaced apart in the width direction of the backrest 7 (along the load support surface 71f), and an upper rod 82 that connects upper ends of the pair of vertical rods 81. , And a connecting portion 83 that connects the lower ends of the pair of vertical rods 81. The vertical rod 81, the upper rod 82, and the connecting portion 83 are made of, for example, resin and are integrally formed in an annular shape, and are elastically deformable according to the force acting from the tension material 71.

  As shown in FIG. 2, each vertical rod 81 extends along the vertical direction. In detail, the vertical rod 81 is gradually inclined inward in the width direction as it goes downward.

  As shown in FIG. 1, a groove 84 that is recessed toward the inside of the backrest 7 is formed continuously in the circumferential direction on the outer peripheral edge portion of the front back frame 80F. The outer peripheral end portion 71e of the upholstery material 71 is wound around the groove 84.

  An upper connecting portion 85 and a lower connecting portion 86 that extend rearward are integrally formed on the upper portion and the lower portion of each vertical rod 81 of the front back frame 80F. The tip ends of the upper connecting portion 85 and the lower connecting portion 86 are connected to the side portion 73 of the rear frame 70B.

  As shown in FIGS. 1 and 2, a lumbar support (optional member) 200 can be detachably attached to such a backrest 7 of the chair 100.

FIG. 3 is a perspective sectional view showing a mounting structure of the lumbar support with respect to the front frame. FIG. 4 is a perspective development view showing the configuration of the lumbar support mounted on the front back frame.
As shown in FIG. 3, the lumbar support 200 is attached to the lower end portion of the front back frame 80F, that is, the connecting portion 83. Therefore, the connecting portion 83 has a mounted portion 87 on the side separated from the upholstery material 71, which gradually extends forward as it goes upward and projects from the back front frame 80F along the load supporting surface 71f. is doing. The attached portions 87 are opposed to the upholstery material 71 with a space therebetween in a direction intersecting the load supporting surface 71f. As shown in FIG. 4, the front surface 87f of the attached portion 87, which is separated from the upholstery material 71, forms the back surface 80b of the back front frame 80F.

  As shown in FIG. 3, in the connecting portion 83, a concave portion 88 that is recessed toward the outer peripheral side of the spine front frame 80F is provided on the side facing (adjacent to) the tension material 71 with respect to the attached portion 87. The back frame 80F is formed continuously in the circumferential direction.

  Further, the connecting portion 83 has an edge portion 89, which extends toward the inner peripheral side of the backrest 7 and is in contact with the tension material 71, on the side close to the tension material 71. The concave portion 88 is formed between the edge portion 89 and the attached portion 87.

  As shown in FIGS. 3 and 4, the lumbar support 200 includes a lumbar support main body 210, and a first bracket (first member) 220 and a second bracket that support the lumbar support main body 210 on the back front frame 80F of the backrest 7. A (second member) 230 and a back cover 240 (shown in FIG. 4) that covers the first bracket 220 and the second bracket 230 from the back side are provided.

The lumbar support body 210 is arranged along the back of the upholstery material 71 of the backrest 7. The lumbar support body 210 extends from both sides in the width direction of the main support portion 211 in the width direction central portion of the backrest 7 outward in the width direction, and moves the lumbar support body 210 up and down. The lifting operation units 212, 212 are integrally provided. The shape and structure of the lumbar support body 210 are not limited to those shown here, and can be changed as appropriate.
The lumbar support body 210 integrally includes an arm portion 213 extending downward from the main support portion 211.

FIG. 5 is a perspective view of the first bracket and the second bracket as seen obliquely from the front.
As shown in FIGS. 3 to 5, the first bracket 220 includes a base portion 221 housed in a recess 88 formed in the connecting portion 83, and a pair of wall portions that rise upward from both sides in the width direction of the base portion 221. 222 and 222 are integrally provided.

  The base portion 221 is formed in the concave portion 88 so as to have a constant length so as to extend continuously along the circumferential direction of the back front frame 80F. The base portion 221 is arranged so as to abut against the attached portion 87 at the rear from the front in a state of being accommodated in the recess 88, and functions as an attaching portion 223 for fixing the lumbar support 200 to the back front frame 80F.

  As shown in FIG. 5, the pair of walls 222 and 222 are formed in the width direction with a gap larger than the width dimension of the arm 213 of the lumbar support body 210. These wall portions 222 and 222 integrally include convex portions 222t and 222t that project rearward.

  As shown in FIG. 3, the second bracket 230 is arranged on the side separated from the upholstery material 71 with respect to the attached portion 87. As shown in FIGS. 4 and 5, the second bracket 230 integrally includes a base portion 231 and an extending portion 232 that extends upward from the base portion 231.

  The base 231 is arranged along the front surface 87f of the mounted portion 87 of the back front frame 80F (the back surface 80b of the back front frame 80F). The base portion 231 and the base portion 221 of the first bracket 220 are arranged to face each other with the attached portion 87 of the back front frame 80F interposed therebetween.

  As shown in FIG. 5, engaging portions 232s and 232s are formed in the extension portion 232 at positions facing the protrusions 222t and 222t of the first bracket 220. In a state in which the respective engaging portions 232s are engaged with the respective convex portions 222t, a pair of left and right bolts (coupling members) 238 (see FIG. 4) inserted from the rear through the through holes 232h formed in the second bracket 230 are provided. The first bracket 220 and the second bracket 230 are integrally connected by being screwed into the screw holes (not shown) formed in the convex portions 222t, 222t of the first bracket 220. As a result, the base portion 221 (mounting portion 223) of the first bracket 220 and the base portion 231 of the second bracket 230 sandwich the mounted portion 87 of the back front frame 80F.

FIG. 6 is a perspective view of the second bracket as seen obliquely from the rear. FIG. 7 is a cross-sectional view of the second bracket taken along the center of the slit in the width direction.
As shown in FIGS. 3, 5, and 6, the extending portion 232 is formed such that the dimension in the width direction gradually decreases toward the upper side. The extending portion 232 is formed with a slit 233 that is continuous in the vertical direction.
As shown in FIGS. 3, 5, and 7, a guide wall 234 protruding forward is formed on the outer peripheral portion of the slit 233. The arm portion 213 of the lumbar support body 210 is arranged in front of the slit 233.

As shown in FIGS. 6 and 7, notches 237 protruding rearward are formed on both sides of the slit 233 in the width direction on the rear surface of the guide wall 234. A plurality of notches 237 are formed at intervals along the vertical direction.
A slide plate 235 is arranged behind the second bracket 230. As shown in FIG. 7, the slide plate 235 is formed with a protrusion 235t that projects forward and engages with the notch 237.

  The arm portion 213 and the slide plate 235 are opposed to each other with the extending portion 232 interposed therebetween, and are connected to each other by a pair of upper and lower bolts 239 (see FIG. 4) penetrating the slit 233. As a result, the arm portion 213 and the slide plate 235 can slide vertically along the slit 233. By engaging the protrusion 235t of the slide plate 235 with the notch 237, the arm portion 213 and the slide plate 235 are fixed at a plurality of positions along the slit 233, whereby the height of the lumbar support body 210 can be adjusted. It is possible.

When mounting the lumbar support 200 on the back frame 80F, first, the first bracket 220 is slid in the direction along the load supporting surface 71f, and the mounting portion 223 is moved to the gap S between the tension material 71 and the mounted portion 87. (Recessed portion 88).
Next, the second bracket 230 is arranged behind the attached portion 87, and the first bracket 220 and the second bracket 230 are connected by a bolt 238.

Then, the lumbar support body 210 is arranged in front of the first bracket 220, the slide plate 235 is arranged in rear of the second bracket 230, and the arm portion 213 and the slide plate 235 are connected by the bolt 239.
Then, the rear cover 240 is attached to the rear of the second bracket 230.
This completes the mounting of the lumbar support 200 on the back front frame 80F.

  In the chair 100 configured in this manner, the attached portion 87 that is spaced apart and faces the upholstery material 71 is provided on the back front frame 80F, and the attachment portion 223 of the lumbar support 200 is attached to the upholstery material 71 and the attached portion 87. It was inserted in the gap S between and fixed. Thus, when the lumbar support 200 is mounted on the front spine frame 80F, the mounting portion 223 of the lumbar support 200 is moved from the direction along the load supporting surface 71f of the tension material 71 to the gap between the tension material 71 and the mounted portion 87. It suffices if it is inserted into S, and the work can be performed easily. Therefore, workability when the lumbar support 200 is attached to the backrest 7 can be improved.

  Further, the attached portion 87 projects from the back front frame 80F along the load supporting surface 71f. With this structure, the mounting portion 223 of the lumbar support 200 is inserted and fixed in the gap S between the mounted portion 87 protruding from the back front frame 80F along the load supporting surface 71f and the upholstery material 71. .. As a result, when the backrest 7 is viewed from the side opposite to the tension member 71 with respect to the front back frame 80F, the mounting portion 223 of the lumbar support 200 is covered by the mounted portion 87 of the back front frame 80F, and the appearance is improves.

  Further, the back front frame 80F is provided with a concave portion 88 for accommodating the attachment portion 223 on the side facing the tension member 71 with respect to the attachment portion 87. According to such a configuration, by housing the mounting portion 223 in the recess 88, it is possible to suppress the mounting portion 223 of the lumbar support 200 from being exposed to the outside and improve the appearance.

  Further, by connecting the first bracket 220, the second bracket 230 and the second bracket 230 with the bolt 238 while the first bracket 220, the mounting portion 223, and the second bracket 230 sandwich the mounted portion 87, the back front frame The lumbar support 200 can be firmly attached to the attached portion 87 of 80F.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
For example, in the above embodiment, the attached portion 87 is sandwiched between the first bracket 220 and the second bracket 230, but the present invention is not limited to this. For example, a groove for inserting the attached portion 87 is provided in the bracket that supports the lumbar support body 210, and the bracket and the attached portion 87 are connected to each other by a connecting member such as a bolt in a state where the attached portion 87 is inserted into the groove. You may make it connect with.

  Further, the cross-sectional shape of the connecting portion 83 of the front back frame 80F is merely an example, and can be appropriately changed according to the design of the chair 100. For example, the attached portion 87 extends diagonally forward, but may have another shape such as extending vertically upward.

  The configurations in the above embodiments are examples of the present invention, and various modifications can be made without departing from the gist of the present invention.

4 ... Seat 7 ... Backrest 30 ... Support structure 71 ... Stretching material 71e ... Outer peripheral end 71f ... Load support surface 80F ... Back front frame (frame material)
80b ... Back surface 83 ... Connection part 87 ... Attached part 88 ... Recess 100 ... Chair 200 ... Lumber support (optional member)
210 ... Lumber support main body 220 ... First bracket (first member)
223 ... Mounting part 230 ... Second bracket (second member)
238 ... Bolt (connecting member)
F ... Floor surface S ... Gap

Claims (6)

A tension material having a load supporting surface for receiving the load of a seated person,
A frame material that supports the outer peripheral end of the upholstery material,
An attached portion that extends from a connecting portion that connects a pair of vertical rods of the frame member, and that faces the tension member with a space therebetween in a direction intersecting the load supporting surface,
An optional member that is attachable to and detachable from the attached portion,
The optional member has a mounting portion that extends in a direction along the load supporting surface, is inserted into a gap between the tension material and the mounted portion, and is fixed to the mounted portion .
The backrest , wherein the attached portion projects from the frame member along the load supporting surface . The backrest according to claim 1 , wherein the frame member is provided with a concave portion that accommodates the attachment portion on a side facing the tension member with respect to the attachment portion. The optional member is
A first member having the mounting portion,
A second member arranged on the side separated from the tension member with respect to the attached portion,
A connecting member that connects the first member and the second member in a state where the attached portion is sandwiched between the attaching portion and the second member of the first member,
The backrest according to claim 1 or 2, further comprising: The backrest according to any one of claims 1 to 3 , wherein the optional member is a lumbar support. A tension member having a load supporting surface for receiving a load of a seated person, a frame member that supports an outer peripheral end of the tension member, and a connecting portion that connects a pair of vertical rods of the frame member, And a mounted portion that is opposed to and spaced apart in a direction intersecting the load supporting surface with respect to the material, and is attachable to and detachable from the backrest,
Wherein said tension member extends in a direction along the load bearing surface is inserted into the gap between the attachment portion, wherein a shall be fixed to the mounting portion, projecting along the load bearing surface from said frame member Mounting part,
A lumbar support body supported by the mounting portion and arranged behind the upholstery member. A support structure installed on the floor,
A seat supported by the support structure,
A backrest according to any one of claims 1 to 4 , which is supported by the support structure.

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