JP2009201985A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a user to always obtain optimal fit feeling and always take optimal sitting posture since the back face part always fits to the back of the user by arranging an interlocking means which makes the angles of the seat face part and the back face part varies mutually independently, and interlocks the seat face part and the back face part so that the back face part tilts forward when the user sits on the seat face part. <P>SOLUTION: The chair 10 has the seat face part 14 and the back face part 15. The interlocking means which makes the back face part 15 tilt forward and fit to the user's back when the user sits on the seat face part 14 is provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a chair.

  2. Description of the Related Art Conventionally, as a chair used in an office or the like, there is provided a chair whose seat surface portion operates in conjunction with the back portion, that is, the back portion when leaning against the back portion (for example, Patent Document 1 and 2 and Non-Patent Document 1).

  FIG. 2 is a diagram showing a configuration of a conventional chair.

  In the figure, reference numeral 113 denotes a base portion of a conventional chair, which is provided with struts, casters and the like (not shown) and is placed on the floor so as to support the weight of the entire chair and the user sitting on the chair. And the seat surface part 114 on which a user sits is rotatably attached to the upper end of the base part 113 via a joint part. Further, in the middle of the base portion 113, a first link 112 that supports the back portion 115 is rotatably attached via a joint portion. Further, the seat surface portion 114 and the first link 112 are connected by a second link 111 that is rotatably attached to both via a joint portion.

Therefore, when the user seated on the chair leans against the back surface portion 115, the first link 112 that supports the back surface portion 115 rotates with respect to the base portion 113 around the joint portion. Further, since the seat surface portion 114 is connected to the first link 112 by the second link 111, the seat surface portion 114 rotates relative to the base portion 113 around the joint portion in conjunction with the first link 112. .
JP 2000-505679 A Japanese Patent No. 4037438 Wilkahn homepage, “Modus: Function” [online], [Search June 15, 2006], Internet <http://www.wilkhahn.co.jp/products/working/modus/function.html>

  However, in the conventional chair, the seat surface portion 114 does not operate unless a force is applied to the back surface portion 115. Therefore, the back surface portion 115 does not always fit on the user's back, and the user does not always have an optimal fit. I could not get a feeling, and I could not take the optimal sitting posture.

  In other words, the seating surface portion 114 does not operate unless the user sitting on the seating surface portion 114 tilts the back of the back surface greater than the tilting angle of the back surface portion 115 with respect to the seating surface portion 114 in the initial state. Therefore, for example, when the user seated on the seat surface portion 114 does not lean against the back surface portion 115 as in the case of working toward the desk, the angle of the seat surface portion 114 does not change. Could not always obtain the optimum fit and could not take the optimum sitting posture.

  The present invention solves the problems of the conventional chair so that the angle of the seat surface and the angle of the back surface change independently of each other, and the back surface tilts forward when the user sits on the seat surface. By arranging interlocking means to link the seat and back, the back always fits the user's back, and the user can always get the best fit and always the best seating An object is to provide a chair that can take a posture.

Therefore, in the chair of the present invention, the base part, the seat surface part are fixed, the first link rotatably connected to the base part, and the back part is fixed, and the first link is rotatable. The seat surface portion is inclined forward, and when the user sits on the seat surface portion, the seat surface portion becomes substantially horizontal due to the load of the user. And an interlocking means for fitting the back part forward with respect to the seating surface part to fit the back of the user, the interlocking means being a joint part between the base part and the first link And an additional torque generating mechanism that simultaneously applies torque to the joint portion between the first link and the second link,
In the initial state before the user is seated on the seat surface portion, the interlocking means is configured so that the back surface portion is substantially perpendicular to the horizontal surface, and when the user is seated on the seat surface portion, the back surface portion is placed on the horizontal surface. In contrast, it is held substantially vertically.

  In the chair according to the present invention, the interlocking unit may be configured such that, in an initial state before the user is seated on the seat surface portion, the back surface portion is substantially perpendicular to a horizontal plane, and the user is placed on the seat surface portion. When seated, the back surface portion may move downward along with the rotation of the first link and may hold the back surface portion substantially perpendicular to the horizontal plane.

  According to the present invention, the chair has the seat surface portion and the back surface portion so that the angle of the seat surface portion and the angle of the back surface portion are changed independently of each other and the back surface portion is inclined forward when the user is seated on the seat surface portion. Has interlocking means for interlocking. As a result, the user can always obtain an optimal fit and can always take the optimal sitting posture.

It is a figure which shows the structure of the chair in the 1st Embodiment of this invention. It is a figure which shows the structure of the conventional chair. It is a figure which shows the structure of the part between the 1st joint part of the chair in the 1st Embodiment of this invention, and a 2nd joint part. It is a figure which shows the structure of the additional torque generation mechanism of the chair in the 1st Embodiment of this invention. It is a 1st figure which shows the angle of the seat surface part of the chair in the 2nd Embodiment of this invention. It is a 2nd figure which shows the angle of the seat surface part of the chair in the 2nd Embodiment of this invention. It is a figure which shows the torque generation mechanism in the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a chair according to the first embodiment of the present invention.

  In FIG. 1, reference numeral 10 denotes a chair according to the present embodiment. For example, the chair 10 is used for office work in an office or the like, but may be used for housework in a home or the like. It may be used for any purpose in any place. Reference numeral 13 denotes a base portion of the chair 10, which includes a post, a caster, and the like (not shown), is placed on the floor 18, and supports the weight of the entire chair 10 and the user sitting on the chair 10. ing. The base portion 13 may be movable on the floor 18 such as a caster, or may not be movable. It is assumed that a predetermined angle, for example, 90 degrees is maintained.

  A first link 11 is rotatably attached to the base portion 13 via a first joint portion 16. In this case, the base portion 13 and the first link 11 are rotatable about an axis perpendicular to the drawing. Specifically, the base portion 13 includes a bearing at an upper end, and the bearing is disposed so as to be aligned with a rotation axis perpendicular to the drawing. The first link 11 is provided with a shaft at the lower end, and the shaft is inserted into the bearing of the base portion 13 to constitute the first joint portion 16. As a result, the first link 11 can rotate with respect to the base portion 13.

  A second link 12 is rotatably attached to the first link 11 via a second joint portion 17. In this case, the first link 11 and the second link 12 are rotatable around an axis perpendicular to the drawing. Specifically, the first link 11 has a bearing at the upper end, and the bearing is arranged so as to be aligned with a rotation axis perpendicular to the drawing. The second link 12 includes a shaft at the lower end, and the second joint portion 17 is configured by inserting the shaft into the bearing of the first link 11. As a result, the second link 12 can rotate with respect to the first link 11.

  Furthermore, a first torsion spring 25 and a second torsion spring 26 as a torque generating mechanism are disposed in the first joint portion 16 and the second joint portion 17. As a result, the rotational axes of the first joint portion 16 and the second joint portion 17 have the same rotational direction as that of the rotational shaft, and a torque having a magnitude corresponding to the rotational angle is generated.

  Specifically, both ends of the first torsion spring 25 are fixed to the base portion 13 and the first link 11, and both ends of the second torsion spring 26 are connected to the first link 11 and the second link 12. It is fixed. For this reason, when the 1st link 11 rotates with respect to the base part 13, the torque according to the rotation angle which generate | occur | produced with the 1st torsion spring 25 acts on a rotating shaft. Similarly, when the second link 12 rotates with respect to the first link 11, torque corresponding to the rotation angle generated by the second torsion spring 26 acts on the rotation shaft.

  A seat surface portion 14 having a cushion or the like on which a user is seated is fixed to the first link 11. Further, a back portion 15 having a cushion or the like on which the user rests is fixed to the second link 12.

  The initial angle between the base portion 13 and the first link 11 and the initial angle between the first link 11 and the second link 12 in an initial state where the user is not seated can be set as appropriate. it can. The spring constants of the first torsion spring 25 and the second torsion spring 26 can also be set as appropriate.

  Next, the additional torque generating mechanism will be described.

  FIG. 3 is a diagram showing a configuration of a portion between the first joint portion and the second joint portion of the chair according to the first embodiment of the present invention, and FIG. 4 is a diagram according to the first embodiment of the present invention. It is a figure which shows the structure of the additional torque generation mechanism of a chair.

  As shown in FIG. 3, the chair 10 according to the present embodiment has a first joint portion 16 and a second joint portion as a torque generation mechanism in addition to the first torsion spring 25 and the second torsion spring 26. 17 is provided between the first joint 16 and the second joint 17 according to the rotation angle of the first joint 16 and the second joint 17. It has a torque generation mechanism. The additional torque generating mechanism includes a first pulley 21, a second pulley 22, a first tension coil spring 23, and a second tension coil spring 24. The configuration of the additional torque generating mechanism is clearly shown in FIG.

  Here, the first pulley 21 is fixed to the base portion 13 so that the rotation axis thereof coincides with the rotation axis of the first joint portion 16. Similarly, the second pulley 22 is fixed to the second link 12 so that the rotation axis thereof coincides with the rotation axis of the second joint portion 17.

  The first tension coil spring 23 has a wire fixed at both ends. The lower end side wire is wound around and fixed to the outer periphery of the first pulley 21. Further, the wire on the upper end side is wound around and fixed to the outer periphery of the second pulley 22.

  Similarly, the second tension coil spring 24 has wires fixed to both ends. The lower end side wire is wound around and fixed to the outer periphery of the first pulley 21. Further, the wire on the upper end side is wound around and fixed to the outer periphery of the second pulley 22.

  In the present embodiment, the torque generating mechanism and the additional torque generating mechanism function as interlocking means, and when the user is seated on the seat surface portion 14, the back surface portion 15 is tilted forward to fit the user's back. It has become. Further, the torque generating mechanism and the additional torque generating mechanism function as interlocking means, thereby changing the positional relationship between the seating surface part 14 and the back surface part 15 according to the user's load on the seating surface part 14 and the back surface part 15. Thus, the back portion 15 is fitted to the back of the user.

  Next, operation | movement of the chair 10 of the said structure is demonstrated.

  First, let κ be the spring constants of the first tension coil spring 23 and the second tension coil spring 24. As shown in FIG. 3, let the moment arms of the first pulley 21 and the second pulley 22 be r1 and r2, respectively. The spring constants of the first torsion spring 25 and the second torsion spring 26 are κ1 and κ2, respectively. Further, as shown in FIG. 3, the first tension coil spring 23 and the second tension coil spring 24, and the first torsion spring 25 and the second torsion spring 26 are balanced with each other. Assume that the joint angles of the joint portion 16 and the second joint portion 17 are θ1 and θ2, respectively, and the displacement angles from the joint angles are δ1 and δ2, respectively.

  Thus, torques τ1 and τ2 generated by the additional torque generation mechanism and acting on the rotation shafts of the first joint portion 16 and the second joint portion 17 are expressed by the following equation (1).

そして、第１の関節部１６及び第２の関節部１７の回転軸に各々作用するトルクτ１及びτ２と、着座した利用者の重量及び姿勢によって発生する負荷トルクとが釣り合う位置で第１の関節部１６及び第２の関節部１７の回転が停止して、第１のリンク１１及び第２のリンク１２の角度が決定する。すなわち、着座姿勢が定まる。

The first joint 16 is located at a position where the torques τ1 and τ2 acting on the rotation axes of the first joint portion 16 and the second joint portion 17, respectively, and the load torque generated by the weight and posture of the seated user are balanced. The rotation of the part 16 and the second joint part 17 stops, and the angles of the first link 11 and the second link 12 are determined. That is, the sitting posture is determined.

  Thus, in the present embodiment, the angle between the base portion 13 and the first link 11, that is, the displacement angle δ1 from the joint angle θ1 of the first joint portion 16, and the first link 11 The seating posture is determined in conjunction with the angle between the second link 12 and the displacement angle δ2 of the second joint portion 17 from the joint angle θ2.

  That is, unlike the conventional chair in which the seat surface portion 114 does not operate unless force is applied to the back surface portion 115 as described in the section “Background Art”, the seat surface portion 14 and the back surface portion are different in the chair 10 of the present embodiment. 15 are operated in conjunction with each other. Therefore, by appropriately setting each parameter, the position of the back surface portion 15 is optimally set only by the user sitting on the seat surface portion 14. That is, when the user is seated, a setting can be made such that the back surface portion 15 tilts forward so as to fit the user's back.

  In addition, since the seating surface portion 14 and the back surface portion 15 operate in conjunction with each other, the user leans against the back surface portion 15 further from the sitting state, thereby changing the angle between the seating surface portion 14 and the back surface portion 15 optimally, It is possible to set to fit the user in a predetermined positional relationship.

  For example, when the user sits on the seat surface portion 14 fixed to the first link 11, a downward force in FIG. 3 acts on the first link 11. Furthermore, it is assumed that the user leans lightly on the back surface portion 15 fixed to the second link 12. As a result, the joint angle θ1 of the first joint portion 16 and the joint angle θ2 of the second joint portion 17 change. From this phenomenon, it is clear that the displacement angles from the joint angles θ1 and θ2 at this time are δ1> 0 and δ2> 0.

  Therefore, torques τ1 and τ2 acting on the rotation axes of the first joint portion 16 and the second joint portion 17 are expressed by the above equation (1), and κ, κ1, κ2, r1 and r2 are all positive. Because it is greater than 0, τ1 <0 and τ2 <0.

  That is, the torque τ1 acting on the rotation shaft of the first joint portion 16 is a torque for rotating the first link 11 in the counterclockwise direction in FIG. 3, and the user is seated on the seat surface portion 14. The torque is balanced with the downward force acting on the first link 11. Therefore, by optimally adjusting κ, κ1, κ2, r1, and r2, it is possible to give an optimal fit and sitting posture to users of various physiques.

  Further, the torque τ2 acting on the rotation shaft of the second joint portion 17 is a torque for rotating the second link 12 in the counterclockwise direction in FIG. 3, and the seat fixed to the first link 11. The back portion 15 fixed to the second link 12 is fitted to the back of the user sitting on the surface portion 14. This balances the force generated by the user leaning against the back surface 15.

  In addition, even if the displacement angle δ1 changes due to a decrease in the force with which the user leans against the back surface 15, the second link 12 is connected to the user via the back surface 15 under the condition of τ1 <0. Optimum adjustment of κ, κ1, κ2, r1, and r2 to keep fitting to the back can give an optimal fit and sitting posture to users of various physiques.

For example, when the weight of the user is 70 [kg], κ, κ1, κ2, r1, and r2 are set to the following values.
κ = 20000 [N / m]
κ1 = 200 [Nm / rad]
κ2 = 200 [Nm / rad]
r1 = 0.2 [m]
r2 = 0.05 [m]
In this case, the torque for rotating the first link 11 generated by the user sitting on the seat surface portion 14 in the counterclockwise direction in FIG. 3 is 0 for the moment arm from the rotation axis of the first joint portion 16. .2 [m], it is 137 [Nm], which is balanced with the torque τ1 acting on the rotation shaft of the first joint portion 16 expressed by the above formula (1). Thereby, the user's sitting posture is determined.

  Here, when the back surface portion 15 is fitted to the back of the seated user and the joint angle θ2 of the rotation axis of the second joint portion 17 does not change, that is, when δ2 = 0 [deg], From the equation (1), δ1 = 7.8 [deg], and the user's posture is optimally adjusted in combination with a predetermined setting such as the shape of the seat surface portion 14.

Further, in this case, torque τ2 = −27 [Nm] acting on the rotation axis of the second joint portion 17 and the distance to the contact point with the user's waist, that is, the rotation axis of the second joint portion 17 is obtained. If the moment arm is 0.1 [m], the force to fit the user's waist is F = 270 [N], giving a light fit to the user's waist and optimal seating Can give posture.

  Next, a second embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol. The description of the same operation and the same effect as those of the first embodiment is also omitted.

  FIG. 5 is a first diagram showing the angle of the seat surface portion of the chair in the second embodiment of the present invention, and FIG. 6 is a second diagram showing the angle of the seat surface portion of the chair in the second embodiment of the present invention. FIG.

  In the present embodiment, the first link 11 and the second link in the initial state are used in order to more positively use the function of giving an optimal fit and sitting posture to users of various physiques. The angle of 12 is set as shown in FIG. 5, and the angle of the seat surface portion 14 is inclined with respect to the horizontal plane. In other words, the initial angle of the joint angle θ1 of the first joint portion 16 and the initial angle of the joint angle θ2 of the second joint portion 17 are raised from the front end of the seat surface portion 14 so that the seat surface portion 14 moves forward. Set to tilt. In FIG. 5, the line A indicates the central axis of the seat surface portion 14. Since the line A is inclined with respect to the surface of the floor 18, that is, the horizontal plane, the seat surface portion 14 is inclined forward. It is clear that

  Then, when the user is seated on the seat surface portion 14, a downward force is applied to the first link 11, and the first link 11 is rotated in the clockwise direction in FIG. 5 by the downward force. Then, a torque τ1 that acts on the rotation shaft of the first joint portion 16 is generated. The torque τ1 is a torque for rotating the first link 11 in the counterclockwise direction in FIG. 5, and a downward force acting on the first link 11 when the user is seated on the seat surface portion 14. Balance with the torque caused by When these torques are balanced, the joint angle θ1 of the first joint portion 16 is determined.

  Therefore, by optimally adjusting κ, κ1, κ2, r1, and r2, when the user is seated on the seat surface portion 14, the seat surface portion 14 is substantially horizontal as shown in FIG. The joint angle θ1 of one joint portion 16 can be controlled. In FIG. 6, since the line A is substantially parallel to the surface of the floor 18, that is, the horizontal plane, it is clear that the seating surface portion 14 is substantially horizontal.

  Thus, in the present embodiment, when the user is seated on the seating surface portion 14, the first joint is set so that the seating surface portion 14 is substantially horizontal or at an optimum angle with respect to the posture of the user. The joint angle θ1 of the part 16 can be controlled. Similarly, the joint angle θ2 of the second joint portion 17 can be controlled so that the back surface portion 15 has an optimum angle with respect to the posture of the user.

  Next, a third embodiment of the present invention will be described. In addition, about the thing which has the same structure as 1st and 2nd embodiment, the description is abbreviate | omitted by providing the same code | symbol. Also, the description of the same operations and effects as those of the first and second embodiments is omitted.

  FIG. 7 is a diagram showing a torque generation mechanism in the third embodiment of the present invention.

  As described in the first and second embodiments, the base portion 13 and the first link 11 are rotatably connected, and the first link 11 and the second link 12 are rotated. The structure that can be connected does not necessarily need to be composed of a shaft and a bearing, and a similar effect can be expected if the structure is freely rotatable.

  In addition, a torque generation mechanism that generates torque having a magnitude corresponding to the rotation angle of the rotation shafts of the first joint portion 16 and the second joint portion 17 as described in the first and second embodiments is provided. However, it is not always necessary to use a torsion spring. As shown in FIG. 7, a similar torque can be generated even if a pulley and a tension coil spring are attached to the end of the link.

  Furthermore, the additional torque generation mechanism for generating torque simultaneously in the first joint portion 16 and the second joint portion 17 according to the rotation angles of the first joint portion 16 and the second joint portion 17 is not necessarily illustrated in FIG. It is not necessary to be as shown in 3 and 4, and the same applies even if an electric motor or the like is used as long as it generates the torques τ1 and τ2 represented by the formula (1). The effect can be expected.

  In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.

10 Chair 11 First link 12 Second link 13 Base portion 14 Seat surface portion 15 Back portion

Claims (2)

A base part;
A first link having a seat surface portion fixed thereto and rotatably connected to the base portion;
A chair having a back portion fixed and a second link rotatably connected to the first link,
The seat portion is inclined forward;
When the user sits on the seating surface portion, the seating surface portion becomes substantially horizontal due to the load of the user and the back surface portion is tilted forward with respect to the seating surface portion to fit the user's back. Have
The interlocking means is an additional torque generating mechanism that simultaneously applies torque to the joint portion between the base portion and the first link and the joint portion between the first link and the second link. And
In the initial state before the user is seated on the seat surface portion, the interlocking means is configured so that the back surface portion is substantially perpendicular to the horizontal surface, and when the user is seated on the seat surface portion, the back surface portion is placed on the horizontal surface. A chair characterized by being held substantially perpendicular to the chair.   In the initial state before the user is seated on the seat surface portion, the interlocking unit is configured so that the back surface portion is substantially perpendicular to a horizontal plane, and when the user is seated on the seat surface portion, the back surface portion is The chair according to claim 1, wherein the chair moves downward along with the rotation of one link and holds the back surface portion substantially perpendicular to a horizontal plane.

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