JP3752581B2 - Chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair configured such that a seat moves in accordance with a back rocking operation.
[0002]
[Prior art]
As a conventional chair of this type, the back and seat or the supports that support them can be connected to each other so that they can rotate and slide, or via a link mechanism, etc. What is known to move the zodiac is known.
[0003]
Various types of configurations have been considered for this type of chair. The purpose of this type of chair is, for example, in a configuration in which the seat is fixed and only the back is locked. By changing, the shirt of the seated person is turned up, so that such problems can be solved, and a weight sensing function for changing the force required for the rocking operation according to the weight of the seated person can be provided.
[0004]
[Problems to be solved by the invention]
However, such a structure having a movable part tends to cause rattling in the movable part, which may affect the sitting comfort or lack a sense of quality. Therefore, in order to reduce this rattling, it is extremely disadvantageous in terms of cost if processing or assembly accuracy in the movable part is improved or a rattling reduction mechanism or the like is provided.
[0005]
[Means for Solving the Problems]
In view of such a problem, the present invention connects a spine connected to a chair support so as to allow only rotation and a seat connected to the support so as to allow only rotation, so that only the spine, By utilizing the bending of the seat and the support, etc., the locking operation of the back and the movement operation of the seat are linked.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
That is, the chair according to the present invention is supported by the support so that it can only rotate about the first fulcrum set on the support, and performs a rocking operation between the normal use posture and the backward tilt use posture. And a seat supported by the support so as to be able to rotate only about a second fulcrum set at a position deviated from the first fulcrum. From the first fulcrum of the back A connecting point for connecting the displaced portion and the portion displaced from the second fulcrum of the seat so as to be able to rotate only is provided, and the seat is configured to move in accordance with the locking operation of the spine. In addition, the distance between the virtual thought line connecting the first fulcrum and the second fulcrum and the coupling point varies between the first fulcrum, the second fulcrum, and the coupling point caused by the locking operation. Relative distance variation It is configured to absorb by utilizing elastic deformation due to expansion and contraction or deflection of a member constituting the seat or the support, and in the normal use posture, elasticity due to expansion and contraction or deflection is applied to the member constituting the back, the seat or the support. It is characterized in that the deformation is generated and that the stress due to the elastic deformation does not act on the member constituting the seat or the support body in the backward inclined use posture or in the vicinity thereof.
[0007]
In addition, the chair according to the present invention is supported by the support so that it can only rotate about the first fulcrum set on the support so as to perform a rocking operation between the normal use posture and the backward use posture. And a seat supported by the support so as to be able to rotate only about a second fulcrum set at a position deviated from the first fulcrum. From the first fulcrum of the back A connecting point for connecting the displaced portion and the portion displaced from the second fulcrum of the seat so as to be able to rotate only is provided, and the seat is configured to move in accordance with the locking operation of the spine. In addition, the distance between the virtual thought line connecting the first fulcrum and the second fulcrum and the coupling point varies between the first fulcrum, the second fulcrum, and the coupling point caused by the locking operation . Relative distance fluctuation It is assumed that that is configured to absorb by utilizing the elastic deformation due to the expansion and contraction and deflection of the members constituting the support.
In this specification, “substantially only rotation” means that it can only rotate in addition to the meaning that it is only physically completely rotated, but due to actual processing accuracy, errors, etc., It is a concept that includes the case where rattling occurs. Therefore, those originally designed for the purpose of being able to function as both rotation and slide, such as passing a shaft through a long hole, are excluded.
[0008]
If this is the case, even if there is some backlash, etc. at the first fulcrum, the second fulcrum, or the connecting point due to processing errors, etc., It is only in one of the posture states between the normal use posture and the backward tilt use posture, and in all other postures, it is connected at each of these points as the relative position of each point changes with the rocking motion. When stress is applied to a member that has been formed, it can be completely extinguished. In addition, the posture in which the rattle can occur can be set to a posture (for example, a backward tilting posture) in which the rattle is hardly noticed in the design stage. Therefore, rattle can be virtually eliminated with an extremely simple configuration without providing a reduction mechanism or the like that improves machining accuracy.
[0009]
In addition to providing a weight sensing function that increases the force required to tilt the back in accordance with the weight of the seated person, the back locking action at that time is the most efficient vertical movement of the rear part of the seat In order to convert, the second fulcrum of the support is set in front of the first fulcrum and in a substantially horizontal position, a portion extending forward of the back first fulcrum, and the second of the seat A portion extending rearward from the fulcrum is coupled so as to be able to rotate only substantially, and this coupling point is moved up and down along with the locking operation of the spine so that the rear portion of the seat moves up and down. It is preferable to keep it.
[0010]
In order to make the locking operation smooth, the movement of the coupling point accompanying the locking operation is performed only in one of the regions defined by the virtual thought line connecting the first fulcrum and the second fulcrum. It is desirable to do so. This is because the connection point does not exceed the virtual thought line. In order to minimize the influence on the sitting comfort and luxury, and to improve the convenience during transportation , the connecting point is located on the virtual thought line and the back in the state of using the backward tilting posture. The normal use posture is set so that stress does not act on the members constituting the seat or the support, and the connection point is set the farthest from the virtual thought line by moving to the normal use posture side. It is desirable that the deformation of the member is increased by moving it to the side.
[0011]
On the other hand, if the movement of the connection point accompanying the locking operation is performed across the virtual thought line connecting the first fulcrum and the second fulcrum, the connection point crosses the virtual thought line. Various effects can be obtained by utilizing the click feeling given to the seated person. For example, in order to ensure that the seated person knows that the back has reached the moving end and to give the seated person a sense of security, etc., the coupling point should exceed the virtual thought line in the vicinity of the backward tilted posture. Configure it.
[0012]
As a specific embodiment, a configuration in which the back is maintained in a normal use posture in a state where an external force is not applied using an elastic restoring force of an elastic body can be mentioned.
[0013]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The chair according to the present embodiment is formed by supporting a back 2 and a seat 3 on a leg 1 as a support, and the back 2 is configured to be able to perform a locking operation.
The leg 1 includes, for example, four legs 11, 11, 12, 12, a horizontal member 13, and a back seat support member 5. Specifically, the left front leg 11 and the left rear leg 12, and the right front leg 11 and the right rear leg 12 are integrally connected to each other at their upper ends, and these connected left and right front and rear legs 11, 11, 12, and 12 are connected to the upper ends. In the part, it connects through the horizontal member 13, and the self-supporting structure is comprised. A back seat support member 5 including a bottom plate 51 having a substantially rectangular shape in plan view and a side plate 52 erected integrally from each side edge of the bottom plate 51 is fixed to the horizontal member 13 by welding or the like.
[0014]
The back 2 includes a pair of left and right back support rods 6 supported by the back seat support member 5 and a back body 21 fixed to the back support rods 6 and forming a backrest surface. The back support rod 6 is integrally provided with a link portion 62 and a main body portion 61 that curves upward from the rear end of the link portion 62, and the base end portion of the link portion 62 is attached to the back seat. By connecting to the first fulcrum X1 set at the rear portion of the side plate 52 of the support member 5 so as to be able to rotate only about the horizontal axis, the back support member 5 is connected to the back 2 around the first fulcrum X1. A rocking operation is supported between a predetermined normal use posture P and a backward tilt use posture Q. More specifically, the left and right link portions 62 are respectively arranged on the outer sides of the left and right side plates 52, and, for example, one horizontal support shaft S1 is passed through the left and right link portions 62 and the side plates 52 to the left and right. Thus, the link part 62 and the side plate 52 are connected. Needless to say, the side plate 52 and the link portion 62 may be coupled to the left and right separate connecting shafts. Thus, the torsion coil spring 9 is wound around the portion sandwiched between the side plates 52 of the horizontal support shaft S1 via the spacer SP, and one end of the torsion coil spring 9 is applied to the bottom plate 51 and the other end. Is applied to the reinforcing member 63 laid horizontally between the link portions 62 so that the back 2 is maintained in the normal use posture P when no external force is applied by the elastic return force of the torsion coil spring 9. ing. In addition, a regulation mechanism (not shown) having a stopper or the like is provided so that the locking operation is not performed beyond the normal use posture P and the backward tilt use posture Q.
[0015]
The seat 3 includes a seat receiving member 8 supported by the back seat support member 5 and a seat body 31 fixed to the seat receiving member 8 and forming a seating surface. The seat receiving member 8 includes a rectangular plate-shaped seat receiving body 83 and bracket portions 82, 82 suspended from the side edges of the seat receiving body 83. Thus, the bracket portion 82 suspended from the front side of the side edge portion of the seat receiving body 83 is connected to the second fulcrum X2 set at the front portion of the side plate 52 of the back seat support member 5 so as to be substantially rotatable around the horizontal axis. It is. More specifically, the left and right bracket portions 82 are respectively arranged on the inner sides of the left and right side plates 52, and one horizontal support shaft S2 is passed through the left and right bracket portions 82 and the side plates 52 to the left and right. The bracket portion 82 and the side plate 52 are connected to each other. The second fulcrum X2 is set at a position that is substantially the same height as the first fulcrum X1 (slightly above the first fulcrum X1 in this embodiment). Needless to say, the side plate 52 and the bracket portion 82 may be coupled to the left and right connecting shafts.
[0016]
Thus, in this embodiment, the front end portion of the link portion 62 and the bracket portion 81 suspended from the rear side of the side edge portion of the seat receiving body 83 are connected to the first fulcrum X1 via the horizontal connecting shaft S3. And the second fulcrum X2 are connected to each other so as to be able to rotate only substantially.
Here, the connecting point X3, the first fulcrum X1 and the second fulcrum X2 form a triangle or a straight line, and between these three points X1, X2, X3, the back support rod 6, the seat receiving member 8, and the back seat Since they are connected by the support member 5, it is impossible to absorb the variation in the distance between the three points X1, X2, and X3 due to the movement of the coupling point X3, and at first glance it seems that the coupling point X3 cannot move. However, in the present embodiment, practically utilizing the elastic deformation such as slight deflection and expansion / contraction of the link portion 62, the seat receiving member 8, or the back seat support member 5 of the back support rod 6, The connecting point X3 is moved up and down in accordance with the locking operation of the back 2, and the rear portion of the seat 3 is moved up and down accordingly.
[0017]
Specifically, in a state where the back 2 is in the normal use posture P, the coupling point X3 is set to be positioned below the virtual thought line M connecting the first fulcrum X1 and the second fulcrum X2 in the side view. Thus, the seat 3 is set in a posture in which the rear part is sunk most. Further, in a state where the back 2 is in the backward tilted use posture Q, the coupling point X3 is set so as to be located on the virtual thought line M when viewed from the side, and the seat 3 raises its rear part to the substantially horizontal posture. It is trying to become. Such a setting is for providing a weight sensing function in which the force required to tilt the back 2 increases as the weight of the seated person increases.
[0018]
Further, in the present embodiment, in the backward tilting use posture Q, the stress is prevented from acting on the link portion 62, the seat receiving member 8, and the back seat support member 5 of the back support rod 6, and the elastic return of the torsion coil spring 9 is achieved. In the normal use posture P maintained by force, the members 62, 8, and 5 are most likely to undergo elastic deformation such as deflection and expansion / contraction. In this case, the link portion 62 and the seat receiving member 8 may be deformed by an extension force , and the back seat support member 5 may be deformed by a compressive force .
[0019]
Therefore, according to the present embodiment configured as described above, even if there is a slight backlash or the like at the first fulcrum X1, the second fulcrum X2, or the coupling point X3 due to a processing error or the like, it is caused by the backlash. The back 2 and the seat 3 rattle only in the backward tilted use posture Q state, and in all other postures, the relative positions of the respective points X1, X2, and X3 associated with the rocking motion change. When stress is applied to the members connected at these points X1, X2, and X3, they disappear completely. In addition, in the backward tilting use posture Q, it is considered that the seated person usually puts weight on the back 2 and the seat 3 and a load is applied to the chair only in a certain direction. , Hardly care. Therefore, rattle can be virtually eliminated with an extremely simple configuration without providing a reduction mechanism or the like that improves machining accuracy.
[0020]
Such an effect contributes to an improvement in sitting comfort and a high-class feeling, and also contributes to an increase in convenience during transport and a product life. That is, the chair is in a normal use posture at the time of transportation, but since rattling does not occur at this time, the chair is extremely suitable for transportation. In addition, when the rattle rattles, the components of the chair collide with each other, but since this can be avoided, it will have a positive effect on the product life.
[0021]
In addition, this invention is not limited to the said Example. For example, the movement of the coupling point accompanying the locking operation may be performed only in the region above the virtual thought line connecting the first fulcrum and the second fulcrum. However, in this case, if the member is set to have the largest deformation in the normal use posture, the link portion and the seat receiving member may be deformed by the extension force, and the back seat support member is deformed by the compression force. Can occur.
[0022]
Further, the movement of the connecting point accompanying the locking operation may be performed across a virtual thought line connecting the first fulcrum and the second fulcrum. In this case, it is more preferable that the connection point exceeds the virtual thought line in the vicinity of the normal use posture or the backward tilt use posture. When the coupling point exceeds this virtual thought line, the seated person can sense a movement that can be called a click feeling from the back, so that it occurs in the vicinity of the normal use posture or the tilted use posture, so This is because it is possible to know with certainty that the moving end has been reached, and to give a sense of security to the seated person.
[0023]
Furthermore, even if the present invention is applied to one in which the seat can be turned horizontally or one in which a plurality of back seats are arranged on the beam, the same effect can be obtained.
Other specific configurations of the respective parts are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
[0024]
【The invention's effect】
As described in detail above, according to the present invention, even if there is a slight backlash or the like at the first fulcrum, the second fulcrum, or the connecting point due to a processing error or the like, the backlash is caused by the backlash. The backlash is only in one of the posture states between the normal use posture and the back tilt use posture, and in all other postures, the relative positions of the respective points accompanying the rocking motion change. When stress acts on the members connected at these points, they disappear completely. In addition, the posture in which the rattle can occur can be set to a posture (for example, a backward tilting posture) in which the rattle is hardly noticed in the design stage. Therefore, rattle can be virtually eliminated with an extremely simple configuration without improving machining accuracy or providing a rattling reduction mechanism or the like.
[0025]
In the leg, the second fulcrum is set in front of the first fulcrum and in a substantially horizontal position, and the portion extending forward from the first fulcrum of the back and extending rearward from the second fulcrum of the seat. If the rear part of the seat is configured to move up and down by connecting the parts to each other so that they can only rotate substantially and moving the connection point up and down in accordance with the locking action of the spine, It is possible to provide a weight sensing function in which the force required to tilt the back backward is increased according to the body weight. Further, the back rocking operation at that time can be converted into the vertical movement operation of the rear portion of the seat most efficiently.
[0026]
If the movement of the connection point accompanying the locking operation is performed only in one of the regions defined by the virtual thought line connecting the first fulcrum and the second fulcrum, the connection point becomes the virtual thought. Since the line is not exceeded, the locking operation can be made smooth.
If it is configured so that the deformation of the member increases by moving to the normal use posture side, the posture in which rattling can occur is the backward tilt use posture. Therefore, in this backward tilting posture, it is natural that the back is swung, and the seater is left with weight on the back and the seat, and the chair is in a state where a load is applied only in a certain direction. Because of this, it is possible to minimize the influence of hell on sitting comfort. Moreover, although a chair is made into a normal use attitude | position at the time of conveyance, since rattle does not arise at this time, it becomes a very suitable thing for conveyance.
[0027]
If the movement of the connection point accompanying the locking operation is performed across the virtual thought line connecting the first fulcrum and the second fulcrum, the click the back gives the seated person when crossing the virtual thought line Various effects can be obtained by utilizing the feeling. For example, it is possible to reliably know that the spine has reached the moving end by configuring the coupling point so that it exceeds the virtual thought line in the vicinity of the normal use posture or the backward tilt use posture. It is possible to give a sense of security to the user.
[0028]
If the back is maintained in the normal use posture in the state where no external force is applied using the elastic return force of the elastic body, the deformation of the member increases especially by moving to the normal use posture side. The effect of the present invention can be exhibited more remarkably by combining with the configuration described above.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing a chair according to an embodiment of the present invention.
FIG. 2 is a perspective view showing the internal structure of the chair in the embodiment.
FIG. 3 is an exploded perspective view showing the internal structure of the chair in the embodiment.
FIG. 4 is a side view showing the internal structure of the chair in the embodiment.
FIG. 5 is a plan sectional view showing the internal structure of the chair in the embodiment.
FIG. 6 is a side view showing the internal structure of the chair in the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Leg 2 ... Back 3 ... Seat 9 ... Elastic body (torsion coil spring)
X1 ... 1st fulcrum X2 ... 2nd fulcrum X3 ... Connection point P ... Normal use posture Q ... Back tilt use posture M ... Virtual thought line

Claims (8)

A spine configured to be supported by the support so as to be able to rotate only about the first fulcrum set on the support, and to be rocked between a normal use posture and a backward tilt use posture; and the first fulcrum Comprising a seat supported by the support so as to be able to rotate only around the second fulcrum set at the position displaced from
A coupling point is provided for coupling the portion deviated from the first fulcrum of the back and the portion deviated from the second fulcrum of the seat so that they can only rotate with respect to each other. Is configured to move,
The first fulcrum, the second fulcrum, or the relative distance between the coupling points generated when the distance between the virtual thought line connecting the first fulcrum and the second fulcrum and the coupling point varies with the locking operation. It is configured to absorb fluctuations by utilizing elastic deformation caused by expansion / contraction or deflection of members constituting the back, seat or support,
In the normal use posture, the members constituting the back, the seat or the support body are caused to undergo elastic deformation due to expansion and contraction or deflection, and the members constituting the seat or the support body in the backward tilt use posture or in the vicinity thereof. A chair configured so that stress due to the elastic deformation does not act. In the support body, the second fulcrum is set in front of the first fulcrum and at a substantially horizontal position, a portion extending forward from the first fulcrum of the back, and extending rearward from the second fulcrum of the seat. The rear part of the seat is configured to move up and down by connecting the parts to each other so that they can only rotate substantially and moving the connecting point up and down in accordance with the locking operation of the spine. The chair according to 1. A spine configured to be supported by the support so that it can only rotate about the first fulcrum set on the support, and to be rocked between a normal use posture and a backward tilt use posture; and the first fulcrum And a seat supported by the support so as to be able to rotate only about a second fulcrum set at a portion displaced from the first fulcrum, and a portion displaced from the first fulcrum of the back, Providing a coupling point that couples the parts displaced from the second fulcrum so that they can only rotate with each other, and configured so that the seat moves in accordance with the locking operation of the spine;
The first fulcrum, the second fulcrum, or the relative distance between the coupling points generated when the distance between the virtual thought line connecting the first fulcrum and the second fulcrum and the coupling point varies with the locking operation. It is configured to absorb fluctuations by utilizing elastic deformation due to expansion and contraction or deflection of members constituting the back, seat or support,
In the support body, the second fulcrum is set to a position substantially in front of the first fulcrum and substantially horizontal, a portion extending forward from the first fulcrum of the back, and extending rearward from the second fulcrum of the seat. The chair is configured such that the rear part of the seat moves up and down by joining the parts so that they can rotate only and moving the joint up and down along with the locking action of the back. The chair according to claim 1, 2, or 3, wherein the movement of the coupling point accompanying the locking operation is performed only in one of the regions defined by the virtual thought line. In the state of using the backward tilted posture, the coupling point is located on the virtual thought line and set so that no stress acts on the members constituting the back, seat, or support, and moved to the normal usage posture side. 5. The chair according to claim 4, wherein deformation of the member is increased by moving the connection point to the normal use posture side by setting the connection point farthest from the virtual thought line. The chair according to claim 1, 2, or 3, wherein the movement of the connecting point accompanying the rocking operation is performed across a virtual thought line connecting the first fulcrum and the second fulcrum. The chair according to claim 6, wherein the chair is configured such that the coupling point exceeds the virtual thought line in the vicinity of the backward tilted use posture. The chair according to any one of claims 1 to 7, wherein the back is maintained in a normal use posture in a state where an external force is not applied by using an elastic return force of the elastic body.

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