JP2018166696A - Chair - Google Patents

Abstract

To provide a chair that facilitates maintenance of a prescribed seating posture.SOLUTION: The chair 10 has a seat part 18 and a backrest part 20. With the thigh 302 of a seated person 300 inclined downward toward the front, an angle θ formed by the thigh 302 and the trunk 304 can be held at an obtuse angle. The seat part 18 is provided so that the front end of a seating face 36a is situated downward from the rear end, and that the front part 37a of the seat part 18 is provided in a tiltable manner vertically relative to the rear part 37b of the seat part 18. The seat part is equipped with a holding part 50 for the purpose of holding the front part 37a in a tilted state upward relative to the rear part 37b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a chair that includes a seat portion and a backrest portion and that can maintain an obtuse angle between the thigh and the trunk while the thigh of a seated person is inclined downward toward the front.

  For example, Patent Document 1 describes a chair that can maintain an obtuse angle between a seat portion and a backrest portion so that the front end of the seat surface is inclined downward.

JP-T 63-503284

  The present inventor has conducted intensive studies, and when the angle formed between the thigh and the trunk is held at an obtuse angle while the thigh of the seated person is tilted downward toward the front, the pelvis of the seated person stands upright. As a result, it was found that the chest can be expanded to facilitate deep breathing, so that sufficient oxygen can be sent to the brain and the concentration of the seated person can be enhanced.

  In the conventional technique such as Patent Document 1 described above, the front side of the seating surface is inclined downward linearly toward the front, so that the thigh of the seated person is easily slid downward. Therefore, there is a possibility that the sitting posture in which the angle between the thigh and the trunk is held at an obtuse angle with the thigh tilted downward toward the front cannot be maintained.

  The present invention has been made in consideration of such problems, and has a sitting posture in which the angle between the thigh and the trunk is held at an obtuse angle with the thigh tilted downward toward the front. The object is to provide a chair that can be easily maintained.

  In order to achieve the above object, a chair according to the present invention comprises a seat portion and a backrest portion, and the thigh of the seated person is tilted downward toward the front and the thigh and the trunk. A chair capable of maintaining an obtuse angle, wherein the seat is provided such that a front end of a seat is positioned below a rear end, and a front part of the seat is a rear part of the seat And a holding part for holding the front part in an inclined state with respect to the rear part.

  According to such a configuration, the front portion of the seat portion can be held in a state where the front portion is inclined upward with respect to the rear portion. Therefore, the front portion slides downward with respect to the seat surface of the thigh of the seated person. Can be suppressed. This makes it possible to easily maintain a sitting posture in which the angle between the thigh and the trunk is held at an obtuse angle while the thigh of the seated person is inclined downward toward the front.

  In the chair, the holding unit may be configured to be able to hold tilt angles of the front part with respect to the rear part at a plurality of angular positions.

  According to such a configuration, the tilt angle of the front part with respect to the rear part can be set according to the preference of the seated person.

  According to the present invention, the front part of the seat can be held in an inclined state with respect to the rear part, so that the thigh of the seated person inclines downward toward the front. It is possible to easily maintain the sitting posture in which the angle between the body and the trunk is held at an obtuse angle.

It is a perspective view of the chair concerning one embodiment of the present invention. It is a longitudinal cross-sectional view of the said chair. FIG. 3A is a cross-sectional view of a seat portion and a base portion of the chair, and FIG. 3B is a cross-sectional view of a backrest portion of the chair. It is one omission explanatory drawing of the holding part of the chair. It is a side view explaining the state where the user sat down on the chair. It is a side view of the chair provided with the holding | maintenance part which concerns on 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. It is a longitudinal cross-sectional view of the chair relevant to the chair of FIG. It is a longitudinal cross-sectional view of the chair which concerns on the other structural example relevant to the chair of FIG.

  Hereinafter, preferred embodiments of a chair according to the present invention will be described with reference to the accompanying drawings. The chair shown in the following embodiments can be suitably used in combination with a learning desk at school or the like. However, the chair can be used for any purpose.

  As shown in FIG. 1, the 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. 16 is provided with a seat 18 provided on the seat 16 and a backrest 20 provided on the seat 18.

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

  The front legs 12 and the rear legs 14 arranged in the front-rear direction are connected by a reinforcing member 24. The reinforcing member 24 is engaged with each of the front leg 12 and the rear leg 14 by screwing the bolt 25a into the nut 25b in a state where the bolt 25a is inserted into the insertion hole (not shown) formed in the reinforcing member 24 and the height adjusting 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 the same materials as those of the front leg 12. A fixing hole 26 is formed in the base portion 16. The base portion 16 is fixed to each of the front leg 12 and the rear leg 14 by four brackets 28. For example, the bracket 28 is fixed to the base 16 by screwing a bolt (not shown) into the fixing hole 26, and is screwed into the nut 29 b with the bolt 29 a inserted through the height adjustment hole 22. It is fixed with respect to the front leg 12 or the rear leg 14. The base portion 16 is fixed to each of the front legs 12 and the rear legs 14 so that the upper surface is inclined downward toward the front.

  As shown in FIGS. 1 and 2, the seat portion 18 includes a pedestal 30 joined to a 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. Examples of the constituent material of the pedestal 30 include the same materials as the constituent materials of the front legs 12. The pedestal 30 and the base 16 may be an integrally molded product. The cushion part 32 is comprised by flexible materials, such as urethane, for example.

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

  As shown in FIGS. 1 and 3A, the pedestal 30 of the seat portion 18 is configured such that the interval L1 between the pair of left and right upper extending portions 38L and 38R can be adjusted. Specifically, the pedestal 30 can push the gap L1 between the pair of left and right upper extending portions 38L and 38R by positioning the seated person 300 between the pair of left and right upper extending portions 38L and 38R. It is configured to be elastically deformable as possible. In FIG. 1, the upper extending portions 38 </ b> L and 38 </ b> R extend over the entire length of the seat body 36 in the front-rear direction. The upward extending portions 38L and 38R have a cushion portion 32 over substantially the whole.

  As shown in FIGS. 1 and 3B, the backrest portion 20 includes a back plate portion 42 provided on the pedestal 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 material as the constituent material of the front leg 12 can be cited. The back plate portion 42 is provided integrally with the pedestal 30. However, the back plate portion 42 may be provided on the base portion 16 in a state separated from the pedestal 30. The cushion part 44 is comprised by flexible materials, such as urethane, for example.

  The backrest 20 is a backrest main body 46 located in the center in the left-right direction, and a pair of left and right that is located on both sides in the left-right direction of the backrest main body 46 and protrudes forward to support the waist 308 of the seated person 300 from both sides. Forward extension portions 48L and 48R (see FIG. 5).

  The backrest portion 20 is configured such that the distance L2 between the pair of left and right front extending portions 48L and 48R can be adjusted. Specifically, the backrest part 20 can widen the distance L2 between the pair of left and right front extension parts 48L and 48R by the seated person 300 being positioned between the pair of left and right front extension parts 48L and 48R. It is configured to be elastically deformable as possible. The front extending portions 48L and 48R are provided in an upper portion of the backrest main body 46.

  As shown in FIG. 5, the backrest 20 is configured to be able to fall back when a load acts backward, and to return to a predetermined angular position by removing or reducing the load. That is, the backrest portion 20 is configured to be able to fall back when the connecting portion between the base 30 and the back plate portion 42 is bent.

  As shown in FIGS. 2, 4, and 5, the chair 10 includes a holding portion 50 for holding the seat body 36 in an inclined state with respect to the rear portion 37 b of the front portion 37 a of the seat body 36. 2 and 4, the holding portion 50 includes 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. The front portion 37 a is provided so as to be rotatable with respect to the shaft 52. The shaft 52 is formed in a hollow shape (annular shape), but may be formed in a solid shape.

  The lock spring 54 has a coil portion 56 a fitted on the outer periphery 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 forward portion 37a tilts downward relative to the rear portion 37b. ing.

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

  On the other hand, when the free end 56c is in the unlocked position, there is no frictional resistance between the shaft 52 and the coil portion 56a, or the frictional resistance is small, so that it tilts downward with respect to the rear part 37b of the front part 37a. It becomes possible. The free end 56c is switched from the locked position to the unlocked position when the front part 37a reaches the upper limit (upper limit) of the tilting range with respect to the rear part 37b, and the front part 37a is changed with respect to the rear part 37b. When the lower limit of the tilting range (lower limit) is reached, the unlock position is switched to the lock position.

  In such a holding portion 50, when the free end 56c is in the locked position when tilted upward from the lower limit position of the front portion 37a with respect to the rear portion 37b, the front portion is at an arbitrary tilt angle α (see FIG. 2). 37a can be held. That is, the load of the seated person 300 can be received by the front part 37a in a state where the front part 37a is inclined upward with respect to the rear part 37b. On the other hand, when it is desired to tilt the front part 37a downward relative to the rear part 37b, the front part 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 part 37a may be tilted upward with respect to the rear part 37b to a desired tilt angle α.

  As shown in FIG. 5, such a chair 10 maintains an obtuse angle θ between the thigh 302 and the trunk 304 with the thigh 302 of the seated person 300 tilted downward toward the front. can do. Therefore, the pelvis of the seated person 300 can easily stand, and as a result, the chest can be expanded to facilitate deep breathing, so that sufficient oxygen can be sent to the brain and the concentration of the seated person 300 can be enhanced.

  Next, the effect of the chair 10 according to the present embodiment will be described.

  The chair 10 includes a seat 18 and a backrest 20, and an obtuse angle θ is formed between the thigh 302 and the trunk 304 in a state where the thigh 302 of the seated person 300 is inclined downward toward the front. It is configured to be holdable. The seat portion 18 is provided such that the front end of the seat surface 36a is positioned below the rear end, and the front portion 37a of the seat portion 18 is provided to be tiltable in the vertical direction with respect to the rear portion 37b of the seat portion 18. It has been. The chair 10 includes a holding portion 50 for holding the front portion 37a while being inclined upward with respect to the rear portion 37b.

  Thereby, since the front part 37a of the seat part 18 can be hold | maintained in the state inclined upwards with respect to the back part 37b, it is below with respect to the seat surface 36a of the thigh 302 of the seated person 300 by the front part 37a. Can be prevented from slipping. This makes it possible to easily maintain the sitting posture in which the angle θ formed between the thigh 302 and the trunk 304 is held at an obtuse angle while the thigh 302 of the seated person 300 is inclined downward toward the front. .

  The holding part 50 is configured to be able to hold the tilt angle α of the front part 37a with respect to the rear part 37b at a plurality of angular positions. Accordingly, the tilt angle α of the front part 37a with respect to the rear part 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. 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 provided on the outer peripheral edge, and a cam 66 for displacing the lock gear 64. And an operating shaft 68 of the cam 66, three spiral springs 70 that press and support the cam 66, a guide plate 72 that guides the displacement of the lock gear 64, and an operating lever 74 for rotating the operating shaft 68.

  The rotating member 60 rotates around 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 can mesh 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, the lock gear 64 is pushed radially outward by the cam 66 pressed and supported by the spiral spring 70 when the operation lever 74 is not operated. The 64 gear teeth 62 are engaged with the gear teeth 76 of the rotating member 60 to be locked. That is, since the rotation of the rotating member 60 is prevented, the tilt of the front part 37a with respect to the rear part 37b is prevented.

  On the other hand, as shown in FIG. 7B, when the operating shaft 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 unlocked from the gear teeth 76 of the rotating member 60. That is, since rotation of the rotation member 60 is permitted, the front part 37a can be tilted in the vertical direction with respect to the rear part 37b.

  The holding portion 50a can hold the front portion 37a with the front portion 37a inclined upward with respect to the rear portion 37b. Moreover, the holding | maintenance part 50a is comprised so that the inclination angle (alpha) with respect to the back part 37b of the front part 37a can be hold | maintained in several angle position. The holding part 50a has the same effect as the holding part 50 described above.

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

  As shown in FIG. 8, the chair 100 is different in the configuration of the seat main body 102 from the configuration of the seat main body 36 described above. The front part 37 a of the seat body 102 has a first cushion part 104, and the rear part 37 b of the seat part body 102 has a second cushion part 106. Each of the 1st cushion part 104 and the 2nd cushion part 106 is comprised by flexible materials, such as urethane, for example. The hardness of the first cushion part 104 is higher than the hardness of the second cushion part 106. The second cushion portion 106 is formed with a recess 40 that supports the buttocks 306 of the seated person 300. The front part 37a of the seat body 102 does not tilt with respect to the rear part 37b. The concave 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. This makes it possible to easily maintain the sitting posture in which the angle θ formed between the thigh 302 and the trunk 304 is held at an obtuse angle while the thigh 302 of the seated person 300 is inclined downward toward the front. .

  As shown in FIG. 9, the chair 200 differs in the structure of the seat part 202 from the seat part 18 mentioned above. The seat portion 202 includes a front frame 204a and a rear frame 204b extending in the left-right direction, and a planar seat portion 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 is configured in a columnar shape, but may be configured in a hollow shape (cylindrical shape).

  The front frame 204 a is supported by a front support portion 208 a provided at the upper end of the front leg 12. The front support portion 208a is provided with a plurality (three in the example of FIG. 9) of recesses 210a (grooves) opened upward. The front frame 204a can be disposed in an arbitrary recess 210a of the front support portion 208a. The front support 208a may be provided with a lock mechanism (not shown) that prevents the front frame 204a from being detached from the recess 210a.

  The rear frame 204b is supported by a rear support portion 208b provided at the upper end of the rear leg 14. The rear support portion 208b is provided with a plurality (three in the example of FIG. 9) of recesses 210b (grooves) opened upward. The rear frame 204b can be disposed in an arbitrary recess 210b of the rear support portion 208b. The rear support 208b may be provided with a lock mechanism (not shown) that prevents the rear frame 204b from being detached from the recess 210b. The rear support part 208b is located above the front support part 208a. In other words, the rear frame 204b is located above the front frame 204a.

  The seat main body 206 is configured, for example, as a woven fabric or a knitted fabric such as a cloth, and is locked to each of the front frame 204a and the rear frame 204b. That is, the seat body 206 can be easily deformed along the physique of the seated person 300. Therefore, as indicated by a two-dot chain line in FIG. 9, in the seat body 206, the portion that supports the buttocks 306 of the seated person 300 is greatly bent as compared with the portion that supports the thigh 302.

  In such a chair 200, since the front frame 204a is positioned below the rear frame 204b, the thigh 302 and the trunk with the thigh 302 of the seated person 300 tilted downward toward the front. The angle θ formed with 304 can be held at an obtuse angle. In addition, since the seat body 206 is made of woven fabric or knitted fabric, the seat portion main body 206 bends downward in accordance with the physique of the seat occupant 300, so that the seat occupant 300 can be prevented from sliding downward with respect to the seat surface 206a. . Therefore, the seating 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 various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Chair 18 ... Seat part 20 ... Backrest part 37a ... Front part 37b ... Back part 50, 50a ... Holding part 300 ... Seated person

Claims (2)

A chair comprising a seat and a backrest, and capable of maintaining an obtuse angle between the thigh and the trunk in a state where the thigh of the seated person is inclined downward toward the front,
The seat is provided such that the front end of the seat surface is positioned below the rear end,
The front part of the seat is provided so as to be tiltable in the vertical direction with respect to the rear part of the seat,
A holding part for holding the front part in a state inclined upward with respect to the rear part;
A chair characterized by that. The chair according to claim 1, wherein
The holding part is configured to be able to hold tilt angles of the front part with respect to the rear part at a plurality of angular positions.
A chair characterized by that.

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