JPH1189666A - Lumber support of chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable after attachment by easily moving/adjusting a projecting part to an optional position without unnecessarily increasing the number of part items, and simplifying installation to an office rotary chair. SOLUTION: A lumber support of a chair forms a back fulcrum by projecting a part of a seat back rest part 2 toward a waist part of a sitting person. A projecting member 8 having an uneven thickness projecting part 10 turning to the waist part is interposed between a back support lever 3 of the seat back rest part 2 and a back applying plate 5, and the projecting member 8 is moved in the vertical direction, and can be fixed to a proper back fulcrum position corresponding to a physical constitution of a chair user. A part 12 on which the projecting part 10 of the back applying plate 5 touches, in its turn, further a waist part of the seat back rest part as well 2 are projected forward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lumbar support for a chair in which a part of a backrest protrudes toward the waist of a seated person to form a back fulcrum. More specifically, the present invention relates to a lumbar support for a chair that can form a unique back support point according to the physique of a chair user.

[0002]

2. Description of the Related Art In order to reduce the burden on the lumbar spine and the pressure on the abdomen of a seated person when sitting on a chair for a long time, a backrest having a lumbar support in which a portion of the backrest protrudes forward has been developed. ing. For example, there are commercially available chairs in which an airbag is built in a portion of a backrest against which a waist of a seated person contacts. In such a chair, the air bag is inflated by a manual air pump attached to the lower side of the seat to press the cushion and the upholstery against the waist, and the height of the peak point (back fulcrum) hitting the waist of the backrest is increased. I try to change it. Some chairs have lumbar supports that use gears to push a portion of the backrest forward. Further, there is known a lumbar support in which the amount of projection and the position of projection from the backrest can be adjusted to correspond to the body shape and sitting posture of the seated person.

[0003]

However, since the conventional lumbar support described above has an adjusting mechanism composed of a combination of a plurality of parts, a mechanism capable of particularly adjusting the projecting position arbitrarily. And the like, the configuration is more complicated, so that the number of parts increases, the cost of parts increases, and the assembling work becomes complicated.

An object of the present invention is to provide a lumbar support that can easily adjust a back support point to a unique position according to a physique of a chair user with a small number of parts. A further object of the present invention is to provide a lumbar support that can be easily mounted on an office swivel chair or the like and that can be retrofitted to an existing chair.

[0005]

In order to achieve the above object, according to the present invention, there is provided a lumbar support for a chair in which a part of a backrest is projected toward a waist of a seated person to form a fulcrum. A protruding member having an uneven protrusion protruding toward the waist is interposed between the back support rod of the backrest and the back abutment plate, and the protruding member is moved up and down so as to be unique to the physique of the chair user. It can be fixed at the position of the back fulcrum.

[0006] Therefore, if the chair fulcrum at the time of purchase does not suit itself, the purchaser of the chair removes the back cover of the backrest and then intervenes between the back support rod and the backrest plate. The back fulcrum can be adjusted by moving the projecting member up and down. Then, a unique optimal fulcrum is obtained according to one's physique. The adjusted protruding member is pressed against the back support rod side by the elasticity of the protruding and deformed back abutment plate or the like, and is fixed at that position.

According to a second aspect of the present invention, in the lumbar support for a chair according to the first aspect, the protruding member and the back support rod are vertically engaged with surfaces that come into contact with each other to move the protruding member up and down. Provide an engaging portion made of irregularities for restraining the projection, move the projecting member up and down over the irregularities, and fix the projecting member at the position where the irregularities are fitted, and set the position of the projecting portion to an arbitrary position It is made to transfer. In this case, the protruding member installed at an arbitrary position between the back support rod and the back support plate engages the engagement portion with the engagement portion provided on the back support rod, thereby moving the back support plate at that position. Fix and project toward the lumbar region of the seated person. The projecting member can be moved by applying a force in the vertical direction as it gets over the unevenness, and is fixed at a position where the unevenness is fitted when the external force is removed.

According to a third aspect of the present invention, in the lumbar support of the chair according to the first or second aspect, a slit is provided at a position where the back abutment plate comes into contact with the projecting member, and a portion divided by the slit can be easily deformed. And Therefore, the portion divided by the slit is easily deformed, so that it is easily deformed according to the shape of the protruding member, and protrudes toward the waist of the seated person.

According to a fourth aspect of the present invention, in the lumbar support for the chair according to the third aspect, a bellows portion is provided at an end of a portion divided by the slit. Therefore, when the portion of the backrest plate divided by the slit comes into contact with the protruding member, the bellows portion is extended, and the backrest plate is easily deformed to conform to the shape of the protruding member.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on an example of an embodiment shown in the drawings.

FIG. 1 shows an embodiment of a lumbar support of a chair according to the present invention. Lumber support for this chair 1
Is for projecting a part of the backrest 2 toward the waist of the seated person. The protruding member 8 having the unevenly projecting portion 10 facing the waist is attached to the back support rod 3 of the backrest 2 and the backrest. The protruding member 8 is interposed between the board 5 and the vertical movement of the protruding member 8 to form a unique back fulcrum (point corresponding to the waist) 15 corresponding to the physique of the chair user.

In this embodiment, the backrest 2 comprises a back support rod 3, a backing plate 5 serving as a core, a cushioning material 6, an upholstery 7 covering these, a back cover (not shown), and the like.
Of course, the present invention is not particularly limited to the cushion structure of the backrest, the upholstery structure, the existence of the back cover, and the like.

The back support rod 3 is a member whose lower end is fixed to a seat receiving member 14 or the like to support the backrest 2. For example, in the present embodiment, as shown in FIG.
Although it is constituted by a book pipe, the shape, structure, support form and the like are not particularly limited, and may be a non-swingable fixedly provided to the seat receiving member 14. An engaging portion 4 that engages with the protruding member 8 is provided on the front side near the upper end of the back support rod 3 near the waist, that is, on the occupant side.

The backrest plate 5 is a member forming the core of the backrest 2, and is attached to the bracket 3a of the back support rod 3 by means of screws or the like, as shown in FIG. 1 or FIG.
It is supported by the back support rod 3. In the present embodiment, the backrest plate 5 is an integrally molded product formed by resin molding. However, the present invention is not particularly limited to this, and even if another material or a separately molded product is joined. Good. The point is that the portion of the back support plate 5 with which the protruding member 8 contacts, that is, the portion requiring deformation, may be formed of a deformable material or structure. It is preferable to have high rigidity. In addition, a cushion material 6 is attached to the backrest plate 5 so that the chair has appropriate elasticity and flexibility as a chair. Further, the surface of the cushion material 6 is covered with an upper covering material 7.

The protruding member 8 is provided so as to be interposed between the back support rod 3 and the back support plate 5, and causes the back support plate 5 to partially protrude toward the occupant. The shape of the protruding member 8 is not particularly limited, but it is preferable that the protruding member 8 is a thick plate having the protruding portion 10 that forms the back fulcrum 15 that fits the waist. In the present embodiment, as shown in the figure, it is formed in a curved uneven thickness with a central portion protruding.

The protruding member 8 and the back support rod 3 are provided with engaging portions 4 and 9 on the surfaces where they abut each other. The protruding member 8 is fixed to the back support rod 3 by the engagement and is provided so as not to move in the vertical direction. Engaging parts 4, 9
In the case of the present embodiment, are formed by corrugated irregularities fitted to each other as shown in FIG. In this case, the projecting member 8 can be fixed to the back support rod 3 without looseness by fitting the unevenness of the waveform without a gap, and by applying a certain amount of force to the projecting member 8 upward or downward, 8 can move over the unevenness of the engaging portion 4 of the back support rod 3. However, the present invention is not particularly limited thereto, and may be, for example, trapezoidal, triangular or other shaped teeth, and may be implemented without any problem as long as the shape allows engagement without rattling. In addition, the engaging portions 4 and 9 may be formed by using a material or a structure having a high coefficient of friction without necessarily having unevenness. For example, it is also possible to attach a rubber material or to form a rough surface. In addition,
Reference numeral 4 ′ indicates an engagement portion that appears on the back side of the back support rod 3.

In the present embodiment, as shown in FIG. 3, the slit 11,
, 11 are provided, and portions 12, ..., 12 divided by the slits 11, ..., 11 can be easily deformed. As a result, the back abutment plate 5 in contact with the protruding member 8 is easily bent and easily deformed toward the occupant. In the present embodiment, five parallel slits 11,.
Are provided at regular intervals, and the space is partitioned into strips. However, the form in which the slits 11, ..., 11 are provided is not particularly limited. For example, five or more slits 11, ..., 11 may be provided as shown in Fig. 5 or not shown. May be provided in a trapezoidal shape by the slits 11,..., 11 that are not parallel to each other. In addition, by drilling a large number of holes, the rigidity of the portion may be reduced to facilitate bending. Furthermore, slit 1
The shape of 1 may be U-shaped, and one end of the part 12 may be cut off from the backrest plate 5.

Further, in this embodiment, the slits 11,.
By providing bellows 13,... 13 at the ends of the parts 12,. Thereby, the portions 12,..., 12 partitioned in a strip shape are further provided with elasticity so that they are easily deformed as shown in FIG. This bellows 13,
, 13 are provided at both ends of the strip-shaped portions 12,..., But are not particularly limited thereto. In some cases, only one end may have a bellows shape.

According to the lumbar support of the chair configured as described above, the protruding member 8 interposed between the back support rod 3 and the back support plate 5 causes the back support plate 5 and the cushion member 6 to elastically support the back. Since the engaging portion 9 is engaged with the engaging portion 4 of the back support rod 3 while being pressed against the support rod 3 side, it is held at that position and does not drop downward. Then, according to the shape of the protruding portion 10, the back support plate 5 and the cushion material 6 are protruded forward, that is, toward the waist of the seated person. Therefore, as shown in FIG. 2, by moving the protruding member 8 up and down, a part of the backrest 2 can be protruded toward the waist of the seated occupant at a height of a desired position.
Can be formed at a unique position according to the physique of the user. Moreover, since the lumbar support 1 can be formed with a small number of parts and the chair can be provided with the lumbar support 1 at low cost, the lumbar support 1 that fits the waist of a seated person can be realized by a simple method. Will be able to do that.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, although the description has been made assuming that the lumbar support 1 of the present embodiment is provided on a chair from the beginning,
The lumbar support 1 of the present invention can be retrofitted to a ready-made chair by using the engaging portion 4 and the protruding member 8 of the back support rod 3 as separate components.

The projecting member 8 of the present embodiment is pressed against the back support rod 3 by the elasticity of the projecting and deformed back abutment plate 5 so as not to move up and down. Round holes may be provided on the upper and lower sides of 8, respectively, and may be movably attached to a back support rod or the like through screws or the like.

[0022]

As is apparent from the above description, according to the lumbar support of the chair according to the first aspect of the present invention, the protrusion protruding toward the waist can be easily moved to an arbitrary position in the up-down direction of the chair, and It will be possible to adjust the height to fit your favorite height. Moreover, this lumbar support can be formed with a small number of parts, and various chairs such as office swivel chairs can be provided with a lumbar support mechanism at low cost.

Therefore, when the purchaser of the chair does not fit the back support point of the chair at the time of purchase, the purchaser moves the protruding member interposed between the back support rod and the back support plate up and down. By adjusting the back fulcrum, it is possible to obtain a unique optimum back fulcrum according to one's physique, and to obtain a feeling of use like a custom-made chair.

According to the lumbar support of the chair according to the second aspect, the position of the projecting member can be easily adjusted by applying upwardly or downwardly a force over the unevenness of the engaging portion. When the projection is removed, it is fixed at the position where the projections and depressions are fitted, so that the position of the protruding member can be reliably fixed with a simple structure.

According to the third aspect of the present invention, the portion divided by the slit is easily deformed, so that it is easily deformed according to the shape of the projecting member, and the projecting member can be moved with a light force. A lumbar support that fits the waist of a seated person can be formed.

According to the fourth aspect of the present invention, when the portion of the back support plate divided by the slit comes into contact with the protruding member, the bellows portion is extended and the back support plate is easily adapted to the shape of the protruding member. Therefore, it is possible to form a lumbar support that further fits the waist of the seated person.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a lumbar support of a chair of the present invention.

FIG. 2 is a schematic longitudinal sectional view showing a lumbar support from the side.

FIG. 3 is a schematic view showing slits and the like provided on a back support plate.

FIG. 4 is a partially enlarged view showing a portion partitioned by a slit.

FIG. 5 is a view showing the structure of the lumbar support, wherein the right half is a front view and the left half is a rear view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lumbar support 2 Backrest 3 Back support rod 4 Engagement part 5 Backrest plate 8 Projection member 9 Engagement part 10 Projection part 11 Slit 12 Partitioned part 13 Bellows part

Continued on the front page (72) Inventor Toru Aoyagi 5331 Nishiharu Kinoshitagawara, Ina-shi, Nagano Takano Co., Ltd. Furniture Development Dept. In-company (72) Inventor Kayoko Nishimura 6-1-1, Oimazato-minami, Higashi-Nari-ku, Osaka-shi, Osaka Inside KOKUYO Corporation

Claims (4)

[Claims] 1. A lumbar support for a chair in which a part of a backrest is projected toward the waist of a seated person to form a back fulcrum, wherein a projecting member having an unevenly thick projection facing the waist is provided on the back of the backrest. A lumbar chair for a chair, wherein the lumbar is interposed between a support rod and a backrest plate, and the projecting member is moved up and down to be fixed at a position of a unique back support point according to the physique of a chair user. support. 2. An engaging portion comprising an uneven portion which engages in a vertical direction and restrains the vertical movement of the projecting member is provided on a surface where the projecting member and the back support rod come into contact with each other, and gets over the uneven portion. 2. The projecting member according to claim 1, wherein the projecting member is vertically movable and the projecting member is fixable at a position where the projections and depressions are fitted, and the position of the projecting portion is moved to an arbitrary position. Lumbar support for chairs. 3. The lumbar of a chair according to claim 1, wherein a slit is provided at a position of the back abutting plate in contact with the protruding member, and a portion divided by the slit can be easily deformed. support. 4. The lumbar support of a chair according to claim 3, wherein a bellows portion is provided at an end of the portion divided by the slit.