JP2022169678A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair capable of easily maintaining a seating posture holding an angle made by a thigh part and the trunk at an obtuse angle in the state that a patient's thigh part is inclined downward toward the front.

SOLUTION: A chair 10 includes a seat part 18 and a backrest part 20. The backrest part 20 can hold angle θ made by a sitter 300 with the seat part 18 when the sitter is seated at an obtuse angle. A front part of the seat part 18 is provided with a holding part 50 provided for a back part of the seat part 18 so that it is vertically tiltable. In the back part of the holding part 50, a recess supporting the hip part 306 of the sitter 300 is formed. On both sides in the horizontal direction of the seat part 18, a set of left and right upper extension parts 38L that protrude above the center part in the horizontal direction of the seat part 18 and can support at least the hip part 306 of the sitter 300 from both sides are provided. The seat part 18 is configured to be capable of adjusting a gap between the set of left and right upward extension parts 38L.

SELECTED DRAWING: Figure 5

COPYRIGHT: (C)2023,JPO&INPIT

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair that has a seat and a backrest, and that can maintain an obtuse angle between the thighs and the trunk of a seated person in a state in which the thighs are inclined downward toward the front.

For example, Patent Literature 1 describes a chair capable of maintaining an obtuse angle between a seat and a backrest so that the front end of the seat surface is inclined downward.

Japanese Patent Publication No. 63-503284

The present inventors conducted extensive studies and found that when the thighs of a seated person are tilted downward toward the front and the angle between the thighs and the trunk is held at an obtuse angle, the pelvis of the seated person stands up. As a result, it is possible to expand the chest and facilitate deep breathing, so that sufficient oxygen can be delivered to the brain and the concentration of the seated person can be improved.

In the prior art such as the above-mentioned Patent Literature 1, the front side of the seat surface is linearly inclined downward toward the front, so that the thighs of the seated person tend to slide downward. Therefore, it may not be possible to maintain a sitting posture in which an obtuse angle is maintained between the thighs and the trunk while the thighs are tilted downward toward the front.

The present invention has been devised in consideration of such problems. The object is to provide a chair that can be easily maintained.

A first aspect of the present invention includes a seat portion and a backrest portion, the seat portion is provided so that the front end of the seat surface is positioned below the rear end of the seat surface, and the backrest portion is provided so that a seated person can sit thereon. A chair that can sometimes hold an obtuse angle with the seat, wherein the front portion of the seat includes a holding portion that is tiltable in the vertical direction with respect to the rear portion of the seat, A recess for supporting the buttocks of the seated person is formed in the rear part of the holding part, and both sides of the seat part in the left-right direction project upward from the central part of the seat part in the left-right direction. A chair comprising: a pair of left and right upward extensions capable of supporting at least the buttocks of a person from both sides; .

A second aspect of the present invention includes a seat portion and a backrest portion, the seat portion is provided so that the front end of the seat surface is positioned below the rear end of the seat surface, and the backrest portion is provided so that the seated person can sit thereon. A chair that can sometimes hold an obtuse angle with the seat, wherein the front portion of the seat includes a holding portion that is tiltable in the vertical direction with respect to the rear portion of the seat, A recess for supporting the buttocks of the seated person is formed in the rear part of the holding part, and both sides of the backrest part in the left-right direction protrude forward from the central part of the backrest part in the left-right direction. The chair is provided with a pair of left and right forward extending portions capable of supporting the waist of a person from both sides, and the backrest portion is configured such that the interval between the pair of left and right forward extending portions can be adjusted.

According to the present invention, since the front part of the seat can be held in a state inclined upward with respect to the rear part, the thighs of the seated person can be held in a state in which the thighs are inclined downward toward the front. It is possible to easily maintain a sitting posture in which an obtuse angle is maintained between the body and the trunk.

1 is a perspective view of a chair according to one embodiment of the invention; FIG. It is a longitudinal cross-sectional view of the chair. Figure 3A is a cross-sectional view of the seat and base of the chair, and Figure 3B is a cross-sectional view of the back of the chair. FIG. 4 is an abbreviated explanatory diagram of a holding portion of the chair; It is a side view explaining the state where the user sat down on the said chair. FIG. 10 is a side view of a chair with holding parts according to a modification; 7A is a first cross-sectional explanatory view of the holding portion shown in FIG. 6, and FIG. 7B is a second cross-sectional explanatory view of the holding portion shown in FIG. Figure 2 is a longitudinal sectional view of a chair related to the chair of Figure 1; 2 is a longitudinal sectional view of a chair according to another configuration example related to the chair of FIG. 1; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a chair according to the present invention will be described below with reference to the accompanying drawings. Chairs shown in the following embodiments can be suitably used in combination with study desks at schools and the like. However, the chair can be used for any purpose.

As shown in FIG. 1, a chair 10 according to the first embodiment of the present invention includes two front legs 12, two rear legs 14, a base 16 supported by the front legs 12 and the rear legs 14, and a base A seat portion 18 provided on the seat portion 16 and a backrest portion 20 provided on the seat portion 18 .

The front leg 12 extends vertically and has a U-shaped cross section. A plurality of height adjustment holes 22 are formed in the front leg 12 at regular intervals along the vertical direction. Examples of materials for forming the front legs 12 include metal, hard resin, and wood. The rear legs 14 are configured in the same manner as the front legs 12 except that they are longer than the front legs 12 in the vertical direction.

The front leg 12 and the rear leg 14 arranged in the front-rear direction are connected by a reinforcing member 24 . The reinforcing member 24 is attached to the front leg 12 and the rear leg 14 by screwing a nut 25b into the bolt 25a through an insertion hole (not shown) formed in the reinforcing member 24 and the height adjustment hole 22. fixed. The height position of the reinforcing member 24 can be arbitrarily changed according to the height adjustment hole 22 .

The base 16 is formed in a substantially square plate shape. Examples of the constituent material of the base portion 16 include those similar to those of the front leg 12 . A fixing hole 26 is formed in the base portion 16 . Base 16 is secured to each of front leg 12 and rear leg 14 by four brackets 28 . The bracket 28 is, for example, fixed to the base 16 by screwing a bolt (not shown) into the fixing hole 26, and by inserting the bolt 29a through the height adjustment hole 22 and screwing it into the nut 29b. It is fixed relative to the front leg 12 or rear leg 14 . The base portion 16 is fixed to each of the front leg 12 and the rear leg 14 so that the upper surface slopes downward toward the front.

As shown in FIGS. 1 and 2 , the seat portion 18 has a pedestal 30 joined to the central portion of the upper surface of the base portion 16 and a cushion portion 32 provided on the upper surface of the pedestal 30 . The material of the pedestal 30 is, for example, the same as the material of the front leg 12 . Pedestal 30 and base 16 may be integrally molded. The cushion portion 32 is made of, for example, a flexible material such as urethane.

As shown in FIGS. 1 to 3A, the seat 18 includes a seat main body 36 positioned in the center in the left-right direction, and a seat main body 36 positioned on both sides in the left-right direction of the seat main body 36 and protruding upward to accommodate the buttocks of a seated person 300. As shown in FIGS. 306 and a pair of left and right upward extensions 38L and 38R capable of supporting the thigh 302 from both sides (see FIG. 5). As shown in FIGS. 1 and 2, the front portion 37a of the seat main body 36 is provided to be vertically tiltable with respect to the rear portion 37b of the seat main body 36. As shown in FIGS. A recessed portion 40 that supports the buttocks 306 of the seated person 300 is formed in the seat surface 36 a that is the upper surface of the seat main body 36 . The recessed portion 40 is formed in the cushion portion 32 of the rear portion 37b. The front end of the seat surface 36a is positioned below the rear end of the seat surface 36a. The recessed portion 40 and the front portion 37a function as a seating position maintaining portion for maintaining the seating position of the seated person 300. As shown in FIG.

As shown in FIGS. 1 and 3A, the pedestal 30 of the seat portion 18 is configured such that an interval L1 between a pair of left and right upwardly extending portions 38L and 38R can be adjusted. Specifically, the pedestal 30 can widen the space L1 between the pair of left and right upward extensions 38L, 38R when the seated person 300 is positioned between the pair of left and right upward extensions 38L, 38R. It is configured to be elastically deformable as much as possible. In FIG. 1, the upwardly extending portions 38L and 38R extend over the entire length of the seat main body 36 in the front-rear direction. The upwardly extending portions 38L, 38R have the cushion portion 32 substantially over their entirety.

As shown in FIGS. 1 and 3B , the backrest portion 20 has a back plate portion 42 provided on the base 30 and a cushion portion 44 provided on the front surface of the back plate portion 42 . As a constituent material of the back plate portion 42, for example, the same constituent material as that of the front legs 12 can be used. The back plate portion 42 is provided integrally with the base 30 . However, the back plate portion 42 may be provided on the base portion 16 in a state of being separated from the pedestal 30 . The cushion part 44 is made of, for example, a flexible material such as urethane.

The backrest portion 20 includes a backrest main body 46 positioned in the center in the left-right direction, and a left and right pair positioned on both sides of the backrest main body 46 in the left-right direction and projecting forward to support the waist 308 of the seated person 300 from both sides. forward extensions 48L and 48R (see FIG. 5).

The backrest portion 20 is configured such that the interval L2 between the pair of left and right forward extending portions 48L and 48R can be adjusted. Specifically, in the backrest portion 20, the space L2 between the pair of left and right forward extending portions 48L and 48R can be widened by the seated person 300 being positioned between the pair of left and right forward extending portions 48L and 48R. It is configured to be elastically deformable as much as possible. The forward extending portions 48L and 48R are provided in the upper portion of the backrest main body 46. As shown in FIG.

As shown in FIG. 5, the backrest portion 20 is configured to be tiltable by applying a load to the rear, and to return to a predetermined angular position by removing or reducing the load. That is, the backrest portion 20 is configured to be tiltable backward by bending the connecting portion between the base 30 and the back plate portion 42 .

As shown in FIGS. 2, 4 and 5, the chair 10 includes a holding portion 50 for holding the front portion 37a of the seat main body 36 in an upwardly inclined state with respect to the rear portion 37b. 2 and 4, the holding portion 50 has a shaft 52 provided so as to extend in the left-right direction inside the front portion 37a, and a lock spring 54 wound around the shaft 52. As shown in FIG. The front portion 37a is provided to be rotatable with respect to the shaft 52. As shown in FIG. The shaft 52 is hollow (annular), but may be solid.

The lock spring 54 has a coil portion 56 a fitted around the outer circumference of the shaft 52 . One end of the lock spring 54 constitutes a fixed end 56b fixed to the front portion 37a, and the other end of the lock spring 54 constitutes a free end 56c. The coil portion 54a is wound around the shaft 52 so that the inner diameter of the coil portion 56a becomes smaller when the fixed end 56b rotates with respect to the shaft 52 as the front portion 37a tilts downward with respect to the rear portion 37b. ing.

The holding portion 50 switches the position of the free end 56c between a locked position that prevents the front portion 37a from tilting downward with respect to the rear portion 37b and an unlocked position that allows the front portion 37a to tilt downward with respect to the rear portion 37b. configured as possible. That is, when the free end 56c is in the locked position, frictional resistance is generated between the shaft 52 and the coil portion 56a, so that the front portion 37a is prevented from tilting downward with respect to the rear portion 37b.

On the other hand, when the free end 56c is at the unlocked position, the front portion 37a is tilted downward with respect to the rear portion 37b because no or little frictional resistance is generated between the shaft 52 and the coil portion 56a. It becomes possible. The free end 56c is switched from the locked position to the unlocked position when the front portion 37a reaches the upper limit (upper limit) of the tilting range with respect to the rear portion 37b. When the lower limit (lower limit) of the tilting range is reached, the unlocked position is switched to the locked position.

In such a holding portion 50, the free end 56c is in the locked position when the front portion 37a is tilted upward from the lower limit position with respect to the rear portion 37b. 37a can be retained. That is, the front portion 37a can receive the load of the seated person 300 in a state in which the front portion 37a is inclined upward with respect to the rear portion 37b. On the other hand, when it is desired to tilt the front portion 37a downward with respect to the rear portion 37b, the front portion 37a is tilted upward to the upper limit of the tilting range and the free end 56c is switched to the unlocked position. is tilted downward to the lower limit of the tilting range to switch the free end 56c to the locked position again. Then, the front portion 37a may be tilted upward with respect to the rear portion 37b to the desired tilting angle α.

As shown in FIG. 5, such a chair 10 maintains an obtuse angle .theta. can do. Therefore, the pelvis of the seated person 300 can be easily erected, and as a result, the chest can be expanded and deep breathing can be easily performed, so that sufficient oxygen can be sent to the brain and the concentration of the seated person 300 can be enhanced.

Next, the effects of the chair 10 according to this embodiment will be described.

The chair 10 includes a seat portion 18 and a backrest portion 20. With the thighs 302 of the seated person 300 tilted forward and downward, the angle θ between the thighs 302 and the trunk 304 is made obtuse. configured to be holdable. The seat portion 18 is provided such that the front end of the seat surface 36a is positioned lower than the rear end thereof, and the front portion 37a of the seat portion 18 is provided to be vertically tiltable with respect to the rear portion 37b of the seat portion 18. It is The chair 10 includes a holding portion 50 for holding the front portion 37a inclined upward with respect to the rear portion 37b.

As a result, since the front portion 37a of the seat portion 18 can be held in a state of being inclined upward with respect to the rear portion 37b, the front portion 37a allows the thighs 302 of the seated person 300 to move downward with respect to the seat surface 36a. slippage can be suppressed. As a result, it is possible to easily maintain a sitting posture in which the angle θ formed between the thighs 302 and the trunk 304 is kept obtuse in a state in which the thighs 302 of the seated person 300 are inclined downward toward the front. .

The holding portion 50 is configured to be able to hold the tilting angle α of the front portion 37a with respect to the rear portion 37b at a plurality of angular positions. Thereby, the tilting angle α of the front portion 37a with respect to the rear portion 37b can be set according to the preference of the seated person 300 .

The chair 10 may have a holding portion 50a shown in FIGS. 6 to 7B instead of the holding portion 50. FIG. As shown in FIGS. 6 and 7A, the holding portion 50a includes a rotating member 60 fixed to the front portion 37a, three lock gears 64 having gear teeth 62 on the outer peripheral edge, and a cam 66 for displacing the lock gears 64. , an operating shaft 68 for the cam 66, three spiral springs 70 for pressing and supporting the cam 66, a guide plate 72 for guiding the displacement of the lock gear 64, and an operating lever 74 for rotating the operating shaft 68.

The rotating member 60 rotates about the axis of the operating shaft 68 as the front portion 37a tilts with respect to the rear portion 37b. The rotating member 60 has an annular portion 61 , and gear teeth 76 are provided on the inner peripheral surface of the annular portion 61 . The gear teeth 62 of the lock gear 64 are meshable with the gear teeth 76 of the rotating member 60 . The operation lever 74 is provided so that the seated person 300 can operate it.

In such a holding portion 50a, as shown in FIG. 7A, when the operation lever 74 is not operated, the lock gear 64 is pushed radially outward by the cam 66 that is supported by the spiral spring 70. The gear teeth 62 of 64 mesh with the gear teeth 76 of the rotating member 60 to be in a locked state. That is, since rotation of the rotating member 60 is prevented, tilting of the front portion 37a with respect to the rear portion 37b is prevented.

On the other hand, as shown in FIG. 7B, when the operation lever 74 is operated to rotate the operating shaft 68 against the spring force of the spiral spring 70, the lock gear 64 is displaced inward in the radial direction. The gear teeth 62 are separated from the gear teeth 76 of the rotating member 60 to be in an unlocked state. That is, since rotation of the rotating member 60 is permitted, the front portion 37a can be vertically tilted with respect to the rear portion 37b.

The holding portion 50a can hold the front portion 37a in a state of being inclined upward with respect to the rear portion 37b. Further, the holding portion 50a is configured to be able to hold the tilting angle α of the front portion 37a with respect to the rear portion 37b at a plurality of angular positions. The holding portion 50a has the same effect as the holding portion 50 described above.

Next, configurations of chairs 100 and 200 related to the chair 10 described above will be described. In the chairs 100 and 200, the same reference numerals are given to the same configurations as the above-described chair 10, and detailed description thereof will be omitted.

As shown in FIG. 8, in the chair 100, the configuration of the seat body 102 is different from the configuration of the seat body 36 described above. The front portion 37 a of the seat main body 102 has a first cushion portion 104 , and the rear portion 37 b of the seat main body 102 has a second cushion portion 106 . Each of the first cushion portion 104 and the second cushion portion 106 is made of, for example, a flexible material such as urethane. The hardness of the first cushion portion 104 is higher than the hardness of the second cushion portion 106 . The second cushion portion 106 is formed with a recess 40 that supports the buttocks 306 of the seated person 300 . The front portion 37a of the seat main body 102 does not tilt with respect to the rear portion 37b. The recessed portion 40 and the first cushion portion 104 function as a seating position maintaining portion for maintaining the seating position of the seated person 300 . As a result, it is possible to easily maintain a sitting posture in which the angle θ formed between the thighs 302 and the trunk 304 is kept obtuse in a state in which the thighs 302 of the seated person 300 are inclined downward toward the front. .

As shown in FIG. 9, chair 200 differs from seat 18 described above in the configuration of seat 202 . The seat portion 202 has a front frame 204a and a rear frame 204b extending in the left-right direction, and a planar seat portion main body 206 provided to connect the front frame 204a and the rear frame 204b. Each of the front frame 204a and the rear frame 204b has a columnar shape, but may have a hollow (cylindrical) shape.

The front frame 204a is supported by a front support portion 208a provided at the upper end of the front leg 12. As shown in FIG. The front support portion 208a is provided with a plurality (three in the example of FIG. 9) of concave portions 210a (grooves) opening upward in the front-rear direction. The front frame 204a can be placed in any recess 210a of the front support 208a. Note that the front support portion 208a may be provided with a lock mechanism (not shown) that prevents the front frame 204a from being separated from the recess 210a.

The rear frame 204b is supported by rear support portions 208b provided at the upper ends of the rear legs 14. As shown in FIG. The rear support portion 208b is provided with a plurality of (three in the example of FIG. 9) recesses 210b (grooves) opening upward in the front-rear direction. The rear frame 204b can be placed in any recess 210b of the rear support 208b. Note that the rear support portion 208b may be provided with a lock mechanism (not shown) that prevents the rear frame 204b from being separated from the recess 210b. The rear support portion 208b is located above the front support portion 208a. In other words, the rear frame 204b is positioned above the front frame 204a.

The seat main body 206 is configured as, for example, a woven or knitted fabric such as cloth, and is locked to each of the front frame 204a and the rear frame 204b. That is, the seat main body 206 can be easily deformed according to the physique of the seated person 300 . Therefore, as indicated by the two-dot chain line in FIG. 9 , the seat main body 206 bends more at the portion supporting the buttocks 306 of the seated person 300 than at the portion supporting the thighs 302 .

In such a chair 200, since the front frame 204a is positioned below the rear frame 204b, the thighs 302 and the trunk of the seated person 300 are tilted forward and downward. 304 can be maintained at an obtuse angle. In addition, since the seat main body 206 is made of woven or knitted fabric, it bends downward according to the physique of the seated person 300, so that the seated person 300 can be prevented from sliding downward on the seat surface 206a. . Therefore, the seated position of the seated person 300 can be easily maintained.

The chair according to the present invention is not limited to the above-described embodiment, and can of course adopt various configurations without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10... Chair 18... Seat part 20... Backrest part 37a... Front part 37b... Rear part 38L, 38R... Upward extension part 48L, 48R... Forward extension part 50, 50a... Holding part 300... Seated person 306... Buttocks

Claims (7)

comprising a seat and a backrest,
The seat portion is provided so that the front end of the seat surface is positioned below the rear end,
The backrest is a chair capable of maintaining an obtuse angle with the seat when the occupant is seated,
The front portion of the seat includes a holding portion that is vertically tiltable with respect to the rear portion of the seat,
A recess for supporting the buttocks of the seated person is formed in the rear part of the holding part,
On both sides of the seat in the left-right direction, there is provided a pair of left and right upwardly extending portions that protrude upward from the central portion in the left-right direction of the seat and are capable of supporting at least the buttocks of the seated person from both sides,
The chair, wherein the seat portion is configured such that the interval between the pair of left and right upwardly extending portions is adjustable. A chair according to claim 1,
The seat portion is elastically deformable so that the space between the pair of left and right upward extension portions can be expanded by the seated person being positioned between the pair of left and right upward extension portions. The chair that is composed. comprising a seat and a backrest,
The seat portion is provided so that the front end of the seat surface is positioned below the rear end,
The backrest is a chair capable of maintaining an obtuse angle with the seat when the occupant is seated,
The front portion of the seat includes a holding portion that is vertically tiltable with respect to the rear portion of the seat,
A recess for supporting the buttocks of the seated person is formed in the rear part of the holding part,
On both sides of the backrest portion in the left-right direction, a pair of left and right forward extending portions are provided that project forward from the central portion of the backrest portion in the left-right direction and can support the waist of the seated person from both sides,
The chair, wherein the backrest portion is configured such that the interval between the pair of left and right forward extending portions is adjustable. A chair according to claim 3,
The backrest is configured to be elastically deformable so that the space between the pair of left and right forward extending portions can be widened by the seated person being positioned between the pair of left and right forward extending portions. A chair. A chair according to any one of claims 1 to 4,
The chair, wherein the holding part is configured to be able to hold a tilting angle of the front part with respect to the rear part at a plurality of angular positions. A chair according to any one of claims 1 to 5,
The backrest portion is provided integrally with the seat portion,
The holding part has a shaft provided to extend in the left-right direction inside the front part,
The chair, wherein the front portion is rotatable with respect to the shaft. A chair according to claim 5,
The chair, wherein the holding portion includes an operation lever for setting a tilting angle of the front portion with respect to the rear portion.

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