JP4462227B2 - Chair backrest board and chair provided with the same - Google Patents

Description

  The present invention relates to a flexible chair backrest board and a chair including the same.

Conventionally, there are roughly three types of cushion mechanisms for supporting the entire body, such as a chair seat and a backrest.
First, a cushion material such as polyurethane foam or cotton is stretched over the surface of a three-dimensional curved substrate based on a body curve. According to this, the optimal sitting comfort is obtained when the shape of the board and the curve of the body match, but when the body is moved, a sense of incongruity is felt. In addition, only the stretchability of the cushion material supports the subtle shape of the body and its changes, so a thick cushion material with moderate hardness is required to cope with various physique differences. is there. If the cushioning material is too thin, it may bottom out, and if it is too hard, it will not fit the body well.

  The second one uses a net or canvas instead of the substrate. In particular, if you use a stretchable net, it fits the shape of the body and follows the movement of the body, keeping a suitable sitting comfort, but due to the structure, the net and canvas are always in tension A material to hold is needed. However, the frame material may hit the body at the front edge of the seat, the upper end of the backrest, or the like, and may feel uncomfortable. In addition, in order to avoid hitting, it is not possible to obtain a sufficient support area with the thing made by escaping this part. Furthermore, if there is a hole in the net, it must be replaced immediately.

  The third one should be said to be intermediate between the first one and the second one. By providing an opening in the substrate made of plastic resin, the strength of the substrate is reduced, and when the weight is applied, the substrate It is intended to obtain cushioning properties by utilizing the bending. However, with such a substrate, it is difficult to set which part has a cushioning property, and the deflection of the boundary between the open part and the non-open part is small, and the opening The deflection of the central part is large, and the deviation becomes a problem.

  The present invention provides a flexible backrest board for a chair that can fit a seated person's body with a simple structure and can support the body comfortably following the movement of the body. And a chair provided with the same.

According to the present invention, the above problem is solved as follows.
(1) A large number of strips are integrally provided in a plate-shaped frame portion made of plastic, and appropriate opposing portions of adjacent strips are integrated with each other , and the thickness of the strip is determined. By connecting with the same connecting piece, a number of elongated holes penetrating in the front-rear direction are formed, and the number of connecting pieces in the portion to be largely bent in the frame portion is less than other portions. The average length in the longitudinal direction of the hole in the portion to be largely bent in the frame is made larger than the average length in the longitudinal direction of the hole in the other portion.

  (2) In the above item (1), a portion of the frame portion that is to be largely bent is defined as a portion where the shoulder or waist of the seated person touches.

  (3) In the above item (1) or (2), the number of connecting pieces in the central part in the frame part is less than the number of connecting pieces in both side parts in the frame part. The average length in the longitudinal direction is set to be larger than the average length in the longitudinal direction of the hole portions on the both side portions.

  (4) In any one of the above items (1) to (3), the number of connecting pieces in the central portion in the frame portion is made smaller than the number of connecting pieces in the upper portion in the frame portion, thereby making the hole in the central portion. Let the average length of the longitudinal direction of a part be larger than the average length of the longitudinal direction of the hole part in the said upper part.

  (5) In any one of the above items (1) to (4), the number of connecting pieces in the central part in the frame part is less than the number of connecting pieces in the lower part in the frame part. Let the average length of the longitudinal direction of a part be larger than the average length of the longitudinal direction of the hole in the said lower part.

  (6) In any one of the above items (1) to (5), by reducing the number of connecting pieces in the central part in the frame part from the number of connecting pieces in the peripheral part in the frame part, Let the average length of the longitudinal direction of a hole part be larger than the average length of the longitudinal direction of the hole part in the said peripheral part.

(7) In any of the above items (1) to (6), each strip is corrugated, and appropriate adjacent chevron portions of strips adjacent to each other are coupled with a coupling piece that is integral with them. Thus, the edge of the hole is corrugated.

( 8 ) The chair is provided with a chair backrest substrate having flexibility according to any one of the above items (1) to ( 7 ).

  According to the present invention, the following effects can be achieved.

According to the first to sixth and eighth aspects of the invention, flexibility is imparted to the originally non-flexible plastic substrate, and the number of connecting pieces in the portion that is desired to be largely bent in the frame portion is changed to other values. The center part in the frame part where the seated person's waist hits, for example, can be deflected more than other parts, so that each part of the back of the body can be supported in the most preferable state. And can be adapted to the overall shape of the back surface of the body.

According to the invention of claim 7, wherein each Obijo a waveform, and the chevron portions to appropriate proximity Obijo adjacent to each other, by connecting with a connecting piece integral with them, the edges of the hole Since it is a waveform, the flexibility at any point in the direction of the strip and the direction perpendicular thereto can be made different from that at other points with a simple configuration.

FIG. 1 shows an embodiment of the present invention.
The backrest board (1) has a large number of corrugated waveforms that are horizontally oriented and substantially vertically spaced across the left and right side ridges (3) and (3) of the rectangular frame (2) when viewed from the front. A strip (4) is provided, which is a plate made of plastic.

The width, waveform, wave height, wave pitch, vertical spacing, etc. of the strip (4) may all be the same, but especially at the waist where the load is high, the rigidity should be greater than at other locations. It is desirable to set the above requirements.

A general plate-shaped substrate formed by molding plastic is not substantially flexible. However, according to the substrate (1) shown in FIG. When the load is applied, the strip (4) of that portion is stretched and bent, and the body of the seated person can be comfortably supported.

  The substrate (1) is advantageous in terms of manufacturing and cost because it can be formed by integrally molding plastic or by stamping a plastic plate.

In the region where it is desired to increase the rigidity by reducing the flexibility of the substrate (1), the adjacent mountain-shaped portions of the strips (4) and (4) arranged in the vertical direction are connected to each other in the vertical connecting piece (5 ), A plurality of elongated holes (a1) to (a3) penetrating in the front-rear direction and extending in the left-right direction facing the same direction as the strip (4). ) Is formed. The holes (a1) to (a3) are denoted by reference numerals (a1) to (a3) in order from the shortest length in the left-right direction.

Note that the uppermost and lowermost strips (4) and the upper side ridges (6) and the lower side ridges (7) in the frame portion (2) respectively face the up and down direction integrated with them. It is connected with a plurality of support pieces (8).

According to this embodiment, depending on the presence or absence of the connecting piece (5), the strip (4) stretches at that location, and thus the flexibility differs , and the back of the seated person is supported in the most preferable compressed state. can do.

  That is, in the portion of the board (1) that is to be greatly bent, for example, the portion where the seated person's waist or shoulder hits, the number of connecting pieces (5) in the vertical direction is reduced and the load needs to be strongly supported. The number of connecting pieces (5) can be increased so that various portions of the back surface of the body can be supported in the most preferable state and can be suitably adapted to the overall shape of the back surface of the body.

  In the example shown in FIG. 1, holes (a1) (a2) having a short length in the left-right direction, that is, the longitudinal direction are concentrated on both sides in the frame (2), and between them. In the central part, the hole part (a3) having a long length in the left-right direction and the hole part (a2) having an intermediate length are arranged in combination, so that the hole part (a2) (a3) in the central part is arranged. The average length is larger than the average length of the holes (a1) and (a2) on both sides, so that the center portion is more easily bent than the both sides.

  In the example shown in FIG. 1, a plurality of holes (a2) in the form of regular hexagonal nodules having a small opening dimension are formed in the vertical direction not only on both sides in the frame (2) but also in the center. Arranged side by side, the rigidity of the central part of the board (1) with which the seated person's spine abuts is slightly increased. The relationship of the average length in the longitudinal direction of the part is not affected.

In addition, when the holes (a1) to (a3) that are adjacent to each other in the vertical direction are arranged in a staggered pattern in the left-right direction by a half pitch of the hole (a2), the lattice shape is used. compared to increases the flexibility in the direction orthogonal to the rows of holes (a1) ~ (a3), uniform in the vertical and horizontal directions, Ru smooth flexibility is obtained.

In still embodiment of the above you facilities may also be provided toward Obijo the (4) in the vertical direction. In this case, the connection piece (5) and the support piece (8) face in the left-right direction.

It is a back perspective view showing an example of a chair provided with one embodiment of a backrest substrate by the present invention.

Explanation of symbols

(1) Board
(2) Frame
(3) Acupuncture
(4) Strip
(5) Connecting piece
(6) Upper recumbent
(7) Lower recumbent
(8) Support piece
(a1) to (a3) Hole

Claims (8)

A number of strips are integrally provided in a plate-shaped frame portion made of plastic, and appropriate opposing portions of adjacent strips are integrated with each other , and the plate thickness is the same as the strip. By connecting with the connected pieces, a large number of elongated hole portions penetrating in the front-rear direction are formed, and the number of connecting pieces in the portion to be largely bent in the frame portion is made smaller than the other portions, whereby the frame For the backrest of a chair having flexibility, characterized in that the average length in the longitudinal direction of the hole in the part to be largely bent in the part is larger than the average length in the longitudinal direction of the hole in the other part. substrate.   2. The flexible chair backrest substrate according to claim 1, wherein a portion of the frame portion to be largely bent is a portion against which a seated person's shoulder or waist hits.   By making the number of connecting pieces in the central part in the frame part smaller than the number of connecting pieces in both side parts in the frame part, the average length in the longitudinal direction of the hole part in the central part is set to the hole part in the both side parts. 3. The backrest substrate for a flexible chair according to claim 1 or 2, characterized in that it is larger than the average length in the longitudinal direction.   By making the number of connecting pieces in the central part in the frame part smaller than the number of connecting pieces in the upper part in the frame part, the average length in the longitudinal direction of the hole part in the central part is set to the length of the hole part in the upper part. The board for backrest of the chair which has flexibility in any one of Claims 1-3 set to larger than the average length of a direction.   By making the number of connecting pieces in the central part in the frame part smaller than the number of connecting pieces in the lower part in the frame part, the average length in the longitudinal direction of the hole part in the central part is set to the length of the hole part in the lower part. The board for backrest of a flexible chair according to any one of claims 1 to 4, wherein the board is longer than the average length in the direction.   By making the number of connecting pieces in the central part in the frame part smaller than the number of connecting pieces in the peripheral part in the frame part, the average length in the longitudinal direction of the hole part in the central part is set to the hole part in the peripheral part. The chair backrest substrate having flexibility according to any one of claims 1 to 5, characterized in that it is larger than the average length in the longitudinal direction. 7. Each of the strips is corrugated, and appropriate adjacent chevron portions of the strips adjacent to each other are connected by a connecting piece integral with them, whereby the edge of the hole is corrugated. The board | substrate for backrests of the chair which has flexibility in any one. Chair comprising a backrest for a substrate of a chair having flexibility according to any one of claims 1-7.

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