JP6640533B2 - Chair - Google Patents

Description

  The present invention relates to a chair.

  Chairs in which the backrest is formed of resin have been conventionally manufactured. Although this resin is somewhat flexible, the rigidity of the chair is required, so that when seated, it feels hard.

  In this regard, a chair has been proposed in which a large number of openings are provided in the backrest, and the front and rear dimensions of a vertically continuous connecting piece between the left and right adjacent openings are larger than the left and right dimensions (for example, Japanese Patent No. 4932875). ).

  According to this chair, when a rearward pressing load is applied to the back plate, the back plate expands, and the entire back plate is easily bent backward in a convexly curved shape around the vertically arranged openings, and is arranged in the left-right direction. It has sufficient rigidity to the rear perpendicular to the opening and is less likely to bend. This technique makes it easy to bend in the vertical direction, so that the sitting comfort of the backrest is improved in the vertical direction.

  However, in the left-right direction, the rigidity of the chair is emphasized, so that it is difficult to bend. For this reason, the sitting comfort was unnatural.

Japanese Patent No. 4932875

  The problem to be solved by the present invention is to provide a chair having a resin back that flexes more naturally when seated while ensuring rigidity.

  In order to solve the above problem, a chair according to the present invention includes a seat, a pair of frames that support the seat substantially horizontally behind the seat, a leg that supports the frame, and a support that is supported by the frame. The backrest is formed such that the opening width becomes narrower as the distance from the center of the backrest in the width direction increases, and the opening height increases as going upward, so that the interval between each column and each row becomes equal. And a resin backrest having a plurality of through-holes arranged in a row.

  Advantageous Effects of Invention According to the present invention, there is an effect that a chair having a resin backrest that flexes more naturally when seated while securing rigidity can be provided.

The front perspective view of a chair. The back perspective view of a chair. The bottom view of a chair. Front view of a chair. Rear view of chair. Enlarged view of the backrest. The figure which shows the state which flipped up the seat part of the chair. The side view at the time of nesting a chair.

  Hereinafter, an embodiment of a chair 1 according to the present invention will be described with reference to the drawings. In the present embodiment, a nesting chair that can be raised and raised to the seat and stacked in the front-rear direction will be described as an example. However, the present invention can also be applied to a chair in which the seat does not jump up.

  1 is a front perspective view of the chair 1, FIG. 2 is a rear perspective view of the chair 1, and FIG. As shown in FIGS. 1 to 3, the chair 1 includes a backrest 2A, a frame 2 that supports the backrest 2A rotatably and substantially horizontally, a pair of front legs 2C and a pair of rear legs attached to the frame 2. And a seat 3.

  The backrest portion 2A is formed of resin and has a plurality of through holes whose shape changes according to a certain rule. A front caster 4C is attached to a tip of the front leg 2C on the ground contact side, and a rear caster 4B is attached to a tip of the rear leg 2B on the ground contact side.

  The seat 3 is rotatably installed on the frame 2. A support member 5 is stretched over the frame 2. The seat 3 includes a receiving portion 26 that comes into contact with the support member 5. When the seat 3 rotates and is positioned in the sitting position, the receiving portion 26 comes into contact with the support member 5 to restrict the rotation.

  The frames 2 are respectively arranged outside the seat 3 in the width direction. Therefore, the frame 2 is arranged so as to sandwich the seat 3 from both sides in the width direction.

  FIG. 4 is a front view of the chair 1, and FIG. As shown in FIGS. 4 and 5, the frame 2 is supported by two front legs 2C and two rear legs 2B. The rear leg 2B extends substantially straight from the frame 2 toward the rear of the chair 1 and toward the floor. The rear leg 2B is attached to the frame 2 so that the interval gradually increases from the frame 2 toward the floor.

  The front leg 2C extends obliquely from the frame 2 toward the front of the chair 1 and toward the floor, and bends substantially perpendicular to the floor before the floor.

  In the frame 2, the interval at the mounting portion of the seat 3 is substantially equal to the interval of the rear leg 2 </ b> B. Therefore, it is possible to increase the width of the seat 3 to a width that does not interfere with the frame 2.

  The frame 2 is bent substantially vertically inward at a portion past the mounting portion of the seat portion 3 toward the floor surface, and furthermore, in the vicinity of immediately below the edge of the seat portion 3, that is, the thickness in the width direction of the rear leg portion 2B. After going straight in the horizontal direction by the distance, it bends substantially vertically and extends obliquely in the direction of the floor surface.

  The distance between the outer ends of the front casters 4C of the front legs 2C is smaller than the distance W2 between the inner ends of the rear casters 4B, and the distance between the rear legs 2B is gradually increased as approaching the floor. Therefore, the front leg 2C does not cause physical interference with the rear leg 2B of the other chair 1 when nesting.

  FIG. 6 is an enlarged view of the backrest 2A. As shown in FIG. 6, the backrest 2A has a plurality of through holes whose shape changes according to a certain rule. The shape of the through hole is desirably rectangular in view of processing and design. The shape of the through hole may be an ellipse or a polygon other than a triangle, in addition to a rectangle. When the through-hole is polygonal, the corner may be formed in an arc shape.

  The material of the backrest 2A is desirably polypropylene, and the range of flexibility is desirably 1,000 to 2,000 [Mpa].

  The number of through-holes is preferably 15 or more and 22 or less and 10 or more and 14 or less from the viewpoint of securing rigidity and maintaining flexibility. If it is increased further, the material must be changed to a stronger one, and if it is reduced below this, the material must be changed to a more flexible one.

  The arrangement of the through holes is arranged so as to draw an upwardly convex arc when seated, as shown by a dashed line X1 in the lateral direction. By arranging in this manner, the backrest 2A flexes more naturally in accordance with the back when the backrest 2A is applied by the backrest 2A. In the vertical direction, they are arranged in a straight line, as indicated by a dashed line X2. By arranging in this manner, the backrest 2A flexes more naturally along the spine when the backrest 2A is applied.

  The shape of the through-hole changes so that the opening width L1, which is the horizontal width of the through-hole, becomes narrower as the distance from the center in the width direction increases in the horizontal direction, and the opening height H1 decreases from top to bottom in the vertical direction. It changes to become.

  For example, the opening width L1 of the through-hole becomes narrower as the distance from the first through-hole 602 near the center of the uppermost stage decreases, and the width of the second through-hole 604R on the right end and the third through-hole 604L on the left end become smaller. It is the narrowest in the hole. Since the shape of the through-hole is symmetric with respect to the center axis of the backrest 2A, the width of the second through-hole 604R at the right end is approximately equal to the width of the third through-hole 604L at the left end.

  In addition, since the opening height H1 of the through hole gradually decreases as it goes downward, the fourth portion of the portion slightly higher than the center position in the height direction of the backrest 2A, which is a portion mainly hit by the back when leaning, is used. As compared with the through hole 601, the opening height H1 of the first through hole 602 at the upper end is higher, and the opening height H1 of the sixth through hole 603 at the lower end is lower.

  As a result, the fourth through-hole 601 at a portion mainly contacting the back becomes a substantially square, a circle, or a regular polygon, becomes longer vertically as it goes upward, and becomes thinner as it moves away in the left-right direction.

  The width between the vertical column of the through hole and the vertical column of the adjacent through hole is equal in each column, and between the horizontal row of the through hole and the horizontal row of the adjacent through hole. Are equal in each row. In addition, a blank portion where no through hole is provided is provided at the lower left end portion 606L and the lower right end portion 606R. This is because this portion does not need to bend.

  The higher the height of the through-hole, the more it bends in the vertical direction with a lighter force, and the wider the through-hole, the more it bends in the horizontal direction with a lighter force. Therefore, when the through holes are formed and arranged as described above, when leaning against the backrest 2A, a portion mainly hitting the back bends so as to sink down to the rear of the chair 1, and as it goes above this portion, the vertical direction It becomes easy to bend. Further, since the size of the through hole is small in the portion where the back does not contact, more rigidity can be secured.

  FIG. 7 is a diagram illustrating a state where the seat 3 of the chair 1 is flipped up. As shown in FIG. 7, the seat 3 is rotatably and substantially horizontally supported by the frame 2 behind the seat 3 by the support 2D, so that the seat 3 rebounds by being rotated in the direction of the backrest 2A. Can be raised.

  When the seat 3 is flipped up, the seat 3 and the backrest 2A of the other chair 1 do not cause physical interference, so that nesting is possible.

  FIG. 8 is a side view when the chair 1 is nested. As shown in FIG. 8, the front leg 2C of the chair 1 at the right end in FIG. 8 enters between the rear legs 2B of the chair 1 adjacent to the left side. The chair 1 of the present embodiment may include a bumper 31 having a guide portion at a bent portion of the frame 2. At the time of nesting, the rear leg 2B of the adjacent chair 1 is guided by the guide of the bumper 31 even if the angle is slightly deviated in the initial stage of nesting, and is nested densely at an appropriate position.

  As described above, the chair 1 of the present embodiment supports the seat 3, the pair of frames 2 that support the seat 3 behind the seat 3 so as to be rotatable and substantially horizontally, and the frame 2. A leg portion and a backrest supported by the frame 2, wherein the opening width L1 is reduced as the distance from the center of the backrest in the width direction is increased, and the opening height H1 is increased as going upward. A resin backrest having a plurality of through holes arranged so that the intervals between the columns and the respective rows are equal.

  Therefore, it is possible to provide a chair having a resin backrest that flexes more naturally when seated while ensuring rigidity.

DESCRIPTION OF SYMBOLS 1 Chair 2 Frame 2A Backrest part 2B Back leg part 2C Front leg part 2D Support part 3 Seat part 4B Back caster 4C Front caster 5 Support member 14 rows or more and 22 columns or more 26 Receiving part 31 Bumper 601 Fourth through hole 602 First Through hole 603 Sixth through hole 604L Third through hole 604R Second through hole 606L Left end lower end 606R Right end lower end

Claims (4)

With a seat,
A pair of frames that support the seat substantially horizontally behind the seat,
Legs supporting the frame,
A backrest supported by the frame,
A plurality of through holes are formed such that the opening width becomes narrower as the distance from the center of the backrest in the width direction increases and the opening height increases as going upward, and the intervals between each column and each row are equal. A resin backrest with holes,
A chair equipped with. The through hole,
The chair according to claim 1, wherein the chairs are arranged so as to draw an upwardly convex arc when seated. Said backrest,
3. The chair according to claim 1, further comprising a blank portion in which a through-hole is not provided at a lower end on a left end and a lower end on a right end. The seat is
Rotatably supported by the frame,
Said legs,
The distance between the rear legs gradually increases as approaching the floor so that the distance between the outer ends of the front casters of the front legs is smaller than the distance between the inner ends of the rear casters of the rear legs. The chair according to any one of the preceding claims.

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