JP4204850B2 - Chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to, for example, a chair that can automatically rotate and retract a chair body having a seat portion to a predetermined forward tilt storage position close to a desk or the like when not in use.
[0002]
[Prior art]
Conventionally, in a lecture room of a school or a company, a chair body having a seat is supported on a base member fixed to a floor using legs as support means, and the chair body is provided by a spring or the like provided on the base member. A chair that is biased forward is used. This chair is configured such that the chair body that is pivoted and retracted forward when not seated can be pulled back to a use position where the seat portion is substantially horizontal and can be seated. That is, when the chair is not in use, the chair body automatically turns and retracts to the forward tilted storage position, and for example, the front edge of the seat is stored below the top plate of the desk and the backrest is the top. The chair body would be close to or abut against the board so that the chair body would not get in the way when passing or cleaning. (For example, see Patent Document 1)
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 11-216081 (page 3, paragraph number 0017 FIG. 5)
[0004]
[Problems to be solved by the invention]
However, the chair as described above can be pivoted back and forth by pivoting the upper end of a leg having a certain length on the chair body and the lower end on the base body so as to be pivotable back and forth. Therefore, the turning radius is restricted by the length of the leg, and the turning trajectory is limited. Therefore, the user can form an optimal seat angle according to various situations such as when the chair is stored, seated, or when passing through the back of the chair, or the chair body can be placed in an optimal position. It could not be distributed, and it was inconvenient.
[0005]
SUMMARY OF THE INVENTION Accordingly, the present invention aims to provide a chair that advantageously solves the above problems, and is provided with a chair body having at least a seat portion and a lower portion of the chair body, the seat portion being rotatable. And a support means for supporting the support means, a front support member for supporting the front portion of the seat portion so as to be pivotable forward and backward, and a rear support for supporting the rear portion of the seat portion so as to be pivotable forward and backward. And a turning radius adjusting means for adjusting the turning radius of the front support member or the rear support member, and the rear support member is rearwardly moved in the operation range by tilting the rear support member backward. A stopper and a rear support member provided on the side of the seat bracket when the chair body is moved forward by adjusting the turning radius of the rear support member at the end to hold the chair body in the seating position. Before the top of the The same seat cushion angle with the seating position the chair body together with the rotation radius adjusting means to adjust the rotational radius by regulating the last movement of the rear support member relative to the seat bracket by abutting the movement restricting arm And a front turning restricting means that can be held in a position, and the turning radius adjusting means can be used to change the relative turning radius of the front support member and the rear support member. .
[0006]
In such a chair, a degree of freedom is generated in the rotation trajectory of the chair body. For example, when a user sits on the seat, the chair body is supported in a non-parallel state by the front and rear support members, and the space behind the chair By pulling the chair body to the rear by making the best use of it, it is possible to secure a sufficient space for sitting. In addition, the seating surface angle can be changed to the user-friendly arrangement or the seating surface angle according to the use situation of the chair, for example, by tilting the seating surface forward to an angle at which it is easy to sit down.
[0007]
Furthermore, in order to easily make the chair body an optimum mode, the turning radius adjusting means can change the relative turning radius of the front support member and the rear support member according to the load applied to the chair body. It is desirable to configure something.
[0008]
Further, by configuring the rear support member from an upper link element and a lower link element that can be relatively rotated, the relative rotation radius of the front and rear support members can be changed with a simple structure. By setting it as the structure attached to the base member which fixed the lower end part to the floor etc., when using a chair main body strongly, the stable use state can be ensured.
[0009]
In addition, by providing a front turning restricting means for restricting the front turning of the chair main body, for example, the range of the front turning so that the chair main body is in an optimal mode when the chair is stored is restricted. It is possible to easily and surely realize the optimum mode according to the use situation.
[0010]
Specifically, the front rotation restricting means is composed of a stopper provided below the seat and a front rotation restricting arm provided at the upper end of the support member, and the front rotation restricting arm is brought into contact with the stopper. It is desirable to restrict the forward rotation.
[0011]
In addition, by providing a rear rotation restricting means that restricts the rear rotation of the chair body, for example, when the chair body is pulled backward, the range of the rear rotation is controlled so as not to hit the desk provided at the rear. It is possible to easily and surely realize the optimum mode according to the use situation of the chair.
[0012]
Specifically, the rear rotation restricting means is composed of a stopper fixed to the floor or the like and a rear rotation restricting arm provided at the lower end of the support member. It is conceivable to regulate the contact.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is a perspective view in which a desk T and a plurality of chairs I are arranged, and FIG. 2 is an exploded perspective view of the chair I.
[0015]
The chair I in the present embodiment is used in combination with a lecture desk T when a lecture is given at a school or the like, and a plurality of the desk T and the chair I are arranged in a line in the front-rear direction. These are arranged alternately, and are used with a plurality of chairs I arranged along the width direction.
[0016]
Hereinafter, each configuration will be described in detail.
[0017]
The chair I includes a chair body 1 having a seat portion 12 and support means S that supports the chair body 1 so as to be rotatable in the front-rear direction. Then, the chair body 1 is pivotally supported on the base member 3 fixed to the floor using the support means S, and when not seated, the damper D and the spring member B provided below the chair body 1 are automatically used. The chair is retracted to a position below the top of the desk T provided in front of the desk T, and in use, the seated person can pull back the chair body 1 to the use position and sit down.
[0018]
The chair body 1 has a seat portion 12 mounted on the upper end of the support means S via a seat bracket 2, and a backrest 11 is integrally suspended from the rear edge of the seat portion 12.
[0019]
The seat bracket 2 includes a pair of left and right side walls provided with front and rear bearing holes 22 and 23 for attaching the support means S, and a bottom plate integrally provided between the left and right side walls, and is provided at the upper ends of the left and right side walls. It is screwed to the back surface of the seat portion 12 through the mounting hole 21 of the horizontal wall.
[0020]
The support means S supports the chair body 1 so as to be pivotable in the front-rear direction, and supports a front support member 4 that supports the front of the seat 12 so as to be pivotable in the front-rear direction, and a rearward rotation of the rear of the seat 12. The rear support member 5 is movably supported. The base member 3 fixed to the floor or the like is pivotally supported at the lower end, and the upper end thereof is pivotally supported by the chair body 1 via the seat bracket 2.
[0021]
As shown in FIG. 2, the front support member 4 has a front link element in which up and down front walls and left and right side walls provided with upper and lower bearing holes 411 and 412 at the upper and lower ends are provided on the side surfaces thereof. 41, the upper end portion is attached to the front of the seat portion 12 and the lower end portion is attached to the front of the base member 3 using a shaft. The distance between the upper and lower end portions of the front link element 41 is set as a turning radius R1, and the front of the seat portion 12 is supported so as to be able to turn back and forth.
[0022]
The rear support member 5 includes an upper rear link element 51 and a lower rear link element 52 that are connected to each other so as to be rotatable. The part is attached to the rear of the base member 3 so as to be rotatable. The distance between the upper end portion of the upper rear link element 51 and the lower end portion of the lower rear link element 52 is set as a rotation radius R2, and the rear of the seat portion 12 can be rotated forward and backward.
[0023]
As shown in FIG. 2, the base member 3 has a base body 3a mainly composed of a bottom plate, and has a horizontal wall extending from the bottom plate. A mounting hole is provided and fixed on the floor using a bolt or the like (not shown). Further, left and right side walls having front and rear bearing holes 31 and 32 for pivotally attaching the front support member 4 and the rear support member 5 are erected on the upper surface, and the front support member is interposed between the both side walls. 4 and the lower end part of the rear support member 5 are pivotally attached via a shaft.
[0024]
In the configuration as described above, the chair I of the present embodiment changes the relative turning radii R1 and R2 between the front support member 4 and the rear support member 5 in accordance with the load applied to the chair body 1. A possible turning radius adjusting means 8, a front turning restricting means 6 for restricting the front turning of the chair body 1, and a rear turning restricting means 7 for restricting the back turning of the chair body 1 are provided.
[0025]
The turning radius adjusting means 8 allows the turning radius R2 of the rear support member 5 to be changed according to the load applied to the chair body 1, and specifically, the upper and lower parts constituting the rear support member 5 can be changed. The divided upper and lower rear link elements 51 and 52 are rotatably connected to each other, and the upper end of the upper rear link element 51 is fixed to the chair body 1 and the lower end of the lower rear link element 52 is fixed to the base member 3. Thus, the distance between the upper end portion of the upper rear link element 51 and the lower end portion of the lower rear link element 52, that is, the turning radius R <b> 2 can be changed according to the load applied to the chair body 1. Further, a change range restriction mechanism 81 for restricting the change range of the turning radius R2 is provided between the upper and lower rear link elements 51 and 52.
[0026]
The upper rear link element 51 has a rear wall 512 extending vertically, and left and right side walls 511 provided with upper and lower bearing holes 513 and 514 on the upper and lower ends on the side surface thereof. Is attached to the rear of the seat portion 12 and the lower end portion is rotatably attached to the upper end portion of the lower rear link element 52.
[0027]
Similarly to the upper rear link element 51, the lower rear link element 52 is provided with a rear wall 522 extending vertically, and left and right side walls 521 provided with upper bearing holes 523 on the upper end portion thereof. A lower bearing hole 524 that is inserted in the width direction is provided at the lower end portion. Then, the outer side surfaces of both side walls 521 are brought into contact with the inner side surface of the upper rear link element 51, and the upper end thereof is used as the lower end portion of the upper rear link element 51 and the lower end portion thereof is used as the base member 3. It is attached so that it can be rotated behind.
[0028]
The change range restriction mechanism 81 includes a restriction portion 81 a provided at the lower end portion of the upper rear link element 51 and a restriction arm 81 b provided at the upper end portion of the lower rear link element 52.
[0029]
The restricting portion 81a is composed of a rear wall 811 of the upper rear link element 51 and a front wall 812 that extends horizontally between the lower ends of the left and right side walls 511 of the upper rear link element 51, and the restricting arm 81b is connected to the front and rear walls. 811 and 812 are used to restrict the rotation of the upper rear link element 51 and the lower rear link element 52, and the expansion / contraction width of the rotation radius R2 of the rear support member 5 is restricted.
[0030]
The restricting arm 81b is substantially L-shaped in plan view, and is provided so as to project forward in the center of the upper surface of the upper end of the rear wall 522 of the lower rear link element 52, and has an upper portion having the restricting portion 81a. The rear link element 51 is inserted into a downward opening space C provided at the lower end portion. In this downward opening space C, one end of the spring member 82 held by the spring receiving member 83 provided in the lower rear link element 52 is inserted, and the upper and lower rear link elements 51 and 52 are always erected in the vertical direction. That is, it is elastically biased in the direction of increasing the turning radius R2.
[0031]
The front rotation restricting means 6 includes a stopper 61 provided below the seat portion 12 and a front rotation restricting arm 62 provided at the upper end portion of the rear support member 5. Then, as shown in FIG. 9 to FIG. 11, the front support member 4 and the back support member are controlled by the front turn restricting arm 62 coming into contact with the stopper 61 to restrict the back support member 5 to the front turn limit position. In a state in which 5 forms a non-parallel four-bar link, the seat portion 12 is inclined forward.
[0032]
The stopper 61 is a horizontal member extending horizontally below the seat portion 12, specifically, between the left and right side walls of the seat bracket 2, and the front rotation restricting arm 62 is brought into contact with the upper portion in front of the seat portion 12. A contact portion having a horizontal plane and a vertical plane is provided.
[0033]
The front rotation restricting arm 62 is integrally provided at the upper end portion of the upper rear link element 51, and is formed in a state protruding in front of the left and right side walls 511 of the upper rear link element 51.
[0034]
The rear rotation restricting means 7 includes a stopper 71 provided on the base member 3 fixed to the floor and a rear rotation restricting arm 72 provided on the lower end portion of the rear support member 5. Then, as shown in FIGS. 6 and 8, the rear rotation restricting arm 72 abuts against the stopper 71, thereby restricting the rear support member 5 to the rearward rotation limit position, and the front support member 4 and the rear support. In a state in which the member 5 forms a non-parallel four-bar link, the seat portion 12 is inclined backward.
[0035]
The stopper 71 is an upright wall 3b that stands on the upper surface of the base body 3a, and a contact portion having a horizontal surface that makes the front surface of the rear rotation restricting arm 72 contact with the upper portion of the upright wall 3b.
[0036]
The rear rotation restricting arm 72 is integrally provided at the lower end portion of the lower rear link element 52, and is formed in a state of projecting downward at the center in the width direction.
[0037]
Next, the usage example of the chair I of this Embodiment is demonstrated.
[0038]
First, as shown in FIG. 4, when no load is applied to the chair body 1, the chair body 1 is elastically biased forward by a damper D or the like provided below the chair body 1. In a state where the rotation radius R2 of the rear support member 5 is larger than the rotation radius R1 of the member 4, the front rotation restriction arm 62 contacts the stopper 61 of the front rotation restriction means 6, and the rear surface of the rear rotation restriction arm 72 Is pivoted forward until it comes into contact with the rear wall 73 provided on the base member 3, and is held in a state where the seat front edge is positioned forward, that is, in the storage position. In this forward tilted storage position, the front edge side of the seat 12 enters the lower space of the top plate of the desk T disposed in front of the chair I, and the backrest 11 is close to the use edge of the top plate. Thus, as shown in FIGS. 10 and 11, the chair body 1 is less likely to obstruct traffic.
[0039]
Then, as shown in FIGS. 5 and 6, when using the chair I, the user turns the chair body 1 backward against the urging force of the damper D and pulls it backward. Then, since the upper end part of the rear support member 5 is fixed to the chair body 1 and the lower end part is fixed to the base member 3, as the load is applied to the rear direction of the chair body 1, the rear support member 5 has its turning radius R2. Is increased, and the radius of rotation relative to the front support member 4 is changed. Therefore, the chair body 1 rotates backward until the front surface of the rear rotation restricting arm 72 comes into contact with the stopper 71 of the rear rotation restricting means 7, and the seat portion 12 is held most in the rear position. . At this position, a sufficient space is formed between the front edge side of the seat 12 and the desk T, and the seating surface is inclined forward so that a seated person can easily sit.
[0040]
Next, as shown in FIGS. 7 and 8, when sitting on the chair I, the chair body 1 is given a turning force in the rearward direction due to the weight of the user acting on the seat 12. Therefore, the rear support member 5 gradually bends and tilts forward while reducing the turning radius R2 to bring the seat surface closer to the horizontal state. Then, at the seating position, the rear rotation restricting arm 72 is pressed against the stopper 71, and the restricting arm 81b of the change range restricting mechanism 81 comes into contact with the rear wall 811, so that the chair main body 1 is stabilized at the seating position. Retained.
[0041]
In addition, as shown in FIG. 9, in order to allow the chair I to pass rearward while sitting on the chair I, the seat occupant is rotated forward by applying a load in the forward direction. The chair body 1 can be moved forward while maintaining the seat angle.
[0042]
In the chair I configured as described above, a degree of freedom is generated in the turning trajectory of the chair body 1. For example, when the user sits on the seat portion 12, the chair body 1 is not supported by the front and rear support members 5. The chair is supported in a parallel state, and the chair body 1 can be pulled further back by taking advantage of the space behind the chair I, so that a sufficient seating space can be secured, and the seating surface angle can be made easy to sit on. The user can change the arrangement and the seating angle according to the usage status of I.
[0043]
Furthermore, by configuring the turning radius adjusting means 8 so that the relative turning radius between the front support member 4 and the rear support member 5 can be changed according to the load applied to the chair body 1, it is easy. It becomes possible to make the chair main body 1 into an optimal usage mode.
[0044]
Further, by configuring the rear support member 5 from the upper rear link element 51 and the lower rear link element 52 that can be relatively rotated, the relative rotation radius R1 of the front and rear support members 4 and 5 with a simple structure, R2 can be changed and, for example, a configuration in which the lower end portion of the lower rear link element is attached to the base member 3 fixed to the floor or the like can ensure a stable use state even when the chair body 1 is pulled strongly. be able to.
[0045]
In addition, by providing the front turning restricting means 6 for restricting the front turning of the chair body 1, for example, the range in which the chair body 1 is turned forward is controlled so that the chair body 1 is in an optimum mode when the chair I is stored. In addition, it is possible to easily and surely realize the optimum mode according to the use situation of the chair I.
[0046]
Further, by providing the rear rotation restricting means 7 for restricting the rear rotation of the chair body 1, for example, when the chair body 1 is pulled backward, the rear rotation is prevented so as not to hit the desk T or the like provided at the rear. By regulating the range to be performed, the optimum mode according to the usage state of the chair I can be easily and reliably realized.
[0047]
Of course, the configuration of the present invention is not limited to the above-described configuration. For example, in this embodiment, the turning radius adjusting means 8 is provided on the rear support member 5, but it may be provided on the front support member or on both sides. Further, the turning radius adjusting means 8 may be constituted by a slide mechanism or the like that can change the length of the support members 4 and 5. Other configurations can be variously modified without departing from the spirit of the present invention.
[0048]
【The invention's effect】
The present invention relates to a chair comprising at least a chair main body having a seat portion and a support means provided below the chair main body and rotatably supporting the seat portion. The front support member that supports the front part so that it can pivot back and forth and the rear support member that supports the rear part of this seat so that it can pivot back and forth, and the turning radius of the front support member or rear support member is adjusted. The turning radius adjusting means is provided, and the turning radius adjusting means is used to change the relative turning radius of the front support member and the rear support member.
[0049]
In such a chair, a degree of freedom is generated in the rotation trajectory of the chair body. For example, when a user sits on the seat, the chair body is supported in a non-parallel state by the front and rear support members, and the space behind the chair By pulling the chair body backwards by making full use of it, it is possible to secure a sufficient space for sitting, and the seating surface angle can be made easy to sit on, etc. And the seating surface angle can be changed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a chair and a desk in the present embodiment.
FIG. 2 is an exploded perspective view of the chair according to the embodiment.
FIG. 3 is a perspective view of a chair according to the embodiment.
FIG. 4 is a side view showing a storage mode of the chair in the embodiment.
FIG. 5 is a side view showing a storage mode of the chair in the embodiment.
FIG. 6 is a side view showing a seating process on the chair in the embodiment.
FIG. 7 is a side view showing a seating process on the chair in the embodiment.
FIG. 8 is a side view showing a seating aspect in the embodiment.
FIG. 9 is a side view showing a rear passage mode of the chair in the embodiment.
FIG. 10 is a side view showing a rear passage mode of the chair in the embodiment.
FIG. 11 is a side view showing a rear passage mode of the chair in the embodiment.
[Explanation of symbols]
I ... chair S ... support means R1 ... turn radius R2 ... turn radius 1 ... chair body 4 ... front support member 5 ... rear support member 8 ... times Moving radius adjusting means 6 ... front turning restricting means 7 ... rear turning restricting means 12 ... seat 51 ... upper link element (upper rear link element)
52 ... Lower link element (lower rear link element)
61... Stopper 62... Front rotation restricting arm 71... Stopper 72.

Claims (6)

In a chair comprising at least a chair body having a seat portion and a support means provided below the chair body and rotatably supporting the seat portion,
The support means includes a front support member that supports the front of the seat portion so as to be capable of pivoting back and forth, and a rear support member that supports the rear of the seat portion so as to be capable of pivoting back and forth. A turning radius adjusting means for adjusting a turning radius of the rear support member, and when the user is seated , the turning radius of the rear support member is adjusted when the rear support member becomes the rear end in the operation range. The chair body can be held in the sitting position ,
When the chair body is moved forward, the front support of the rear support member with respect to the seat bracket is restricted by bringing a stopper provided below the seat portion into contact with a front rotation control arm provided at the upper end of the rear support member. The turning radius adjusting means that adjusts the turning radius thereby, and the front turning restricting means that can hold the chair body at the same seating surface angle as the seating position, and using the turning radius adjusting means, A chair configured to be capable of changing a relative turning radius between a front support member and the rear support member.   The chair according to claim 1, wherein the turning radius adjusting means is capable of changing a relative turning radius between the front support member and the rear support member in accordance with a load applied to the chair body.   The chair according to claim 1 or 2, wherein the rear support member is composed of an upper link element and a lower link element capable of relative rotation.   The front rotation restricting means is composed of a stopper provided below the seat and a front rotation restricting arm provided at the upper end of the support member, and the front turning is restricted by bringing the front turning restricting arm into contact with the stopper. The chair according to any one of claims 1 to 3, wherein the chair is formed.   The chair according to any one of claims 1 to 4, further comprising a rear rotation restricting means for restricting the rear rotation of the chair body.   The rear rotation restricting means is composed of a stopper fixed to the floor or the like and a rear rotation restricting arm provided at the lower end of the support member, and the rear turning restricting arm is brought into contact with the stopper to make the rear 6. The chair according to claim 5, wherein rotation is restricted.

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