JP4693293B2 - Chair seat support mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention supports a seat that mainly supports a vertical load of an occupant while maintaining a necessary and sufficient degree of freedom on a seat support member of a chair, such as an office swivel chair. The present invention relates to a support mechanism for a chair seat provided with a function capable of flexibly responding to a certain impact load or a load change or displacement caused by a change in seating posture.
[0002]
[Prior art]
In a conventional general office swivel chair, a rigid seat mounting portion is formed on the upper portion of the leg post, and a seat base such as an outer shell is mounted on the seat mounting portion, and a cushion material made of foamed urethane or the like is mounted on the seat base. Many of these are formed on the seat of the chair by covering the cushioning material with the upholstery.
[0003]
However, a chair with such a seat support structure can provide good cushioning while being held in a substantially constant sitting posture after sitting, but the seating posture can change or the seat can be When an impact load is applied, the elastic deformation of the cushion material may reach a limit, and the rigidity of the seat base, which is a rigid body, is directly transmitted to the seated person's body, which may cause discomfort. In addition, if the cushioning material such as foamed urethane is made thicker to improve this point, the posture becomes difficult to stabilize in a certain sitting posture, and it gets tired instead. Hazardous gas may be generated from the environment, which may cause environmental problems.
[0004]
[Problems to be solved by the invention]
In view of the prior art as described above, the present invention provides a seat support structure that is supported by a seat mounting portion that is mounted on a leg column, such as a large load or impact load applied at the time of sitting, or a change in sitting posture. It is an object of the present invention to provide a seat support mechanism having a function capable of flexibly responding to a load change and displacement caused by the above.
[0005]
[Means for Solving the Problems]
The structure of the seat support mechanism of the present invention made for the purpose of solving the above-mentioned problems is that the front member and the rear member are interposed between both members, and an elastic body is interposed between the two members so that the front member is horizontal in the left-right direction of the seat. A seat mounting member pivotally attached to a front axis by a shaft is attached to the upper end portion of the leg column at the rear side member, and the front end side of the seat back surface is pivotally supported at the front end portion of the front side member, and the seat The seat mounting member supports the seat by sandwiching an elastic body between the rear end side of the back surface and the rear upper surface of the rear member.
[0006]
In the above configuration, the seat back surface is a seat support frame body in which the seat is fixedly mounted on the top surface, or an outer shell of the seat, and the seat includes an outer shell, an inner shell, and a cushioning material, The two shells have a structure in which intersecting slits are formed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the chair seat support mechanism of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view illustrating components of the chair seat support mechanism according to the present invention. FIG. 2 is a perspective view illustrating components of the seat. FIG. 3 is a side view showing a part of an example of the seat support mechanism of the present invention in section, FIG. 4 is a sectional view of an example of an elastic body, and FIG. 5 is a view of a chair equipped with the support mechanism of the present invention. It is a side view of an example.
[0008]
In FIGS. 1 and 3, reference numeral 1 denotes a seat mounting member supported on the upper part of a leg support A provided with a foot a with a caster at the lower part. Here, a front member 11 and a rear member 12 supported on the leg support A are shown. The rear part of the front member 11 is connected to the front end side of the rear member 12 via a connecting shaft 13 so that it can be rotated downward at an appropriate angle. A rubber-based elastic body 2 that elastically supports the movement is interposed between the members 11 and 12 in the vicinity of the connecting shaft 13.
[0009]
On the left and right outer surfaces of the front portion of the front member 11, there are provided mounting shafts 14 for mounting a seat support frame 4 described later, and on the mounting portions 16 formed on the left and right sides of the rear upper surface of the rear member 12. The rubber elastic bodies 3 and 3 having appropriate heights, which will be described later, are attached. Reference numeral 15 denotes a vertical pin for supporting the elastic body 2 inserted between the front member 11 and the rear member 12, and the upper and lower ends of the pin 15 are a retaining flange 15a, a holding plate 15b, A nut 15c is provided.
[0010]
1 and 3, reference numeral 4 denotes a seat support frame made of synthetic resin and formed in an annular shape corresponding to a planar shape of a seat S described later, and the seat mounting member 1 is provided on the left and right sides of the front side thereof. A connecting portion 42 is provided that has mounting holes 41 into which the left and right mounting shafts 14 of the front member 11 are fitted, and the left and right mounting shafts 14, 14 of the front member 11 are fitted into the left and right mounting holes 41, 41. As a result, the front of the support frame 4 is pivotally supported by the seat mounting member 1. The left and right connecting portions 42, 42 in the above are fixed to the support frame 4 by mounting bolts 43, 43 from the lower surface in a state where the holes 41, 41 are loosely fitted to the shaft 14, thereby The front side of the seat support frame 4 is formed to be connected to the front member 11 of the seat mounting member 1 at its shaft 14, but the connection structure between the support frame 4 and the front member 11 is limited to this. It is not a thing.
[0011]
On the other hand, since the left and right sides of the rear lower surface of the seat support frame 4 are joined to the elastic bodies 3 and 3, joint portions 44 and 44 are formed so as to protrude toward the lower surface. It is joined to the elastic bodies 3 and 3. Here, the elastic body 3 has a cross-sectional shape shown in FIG. That is, the elastic body 3 formed of a rubber material in a substantially short columnar shape or a drum shape has a nut member 31 provided with a washer 32 embedded in the upper and lower portions thereof, and the upper and lower nut members 31 are By screwing a mounting bolt (not shown) from the upper surface side of the joint portion 44 in the support frame 4 and from the lower surface side of the mounting portion 16 provided on the rear member 12, the space between the support frame 4 and the rear member 12 is increased. In addition, an intermediate portion of the elastic body 3 is provided to be deformable.
[0012]
As described above, the seat support frame 4 is pivotally fixed to the front member 11 of the mounting member 1 through the shaft 14 in front of the seat support frame 4, while the left and right rear sides of the support frame 4 are deformable elastic bodies. 3 and 3, the seat plate support frame 4 is supported by the rear member 12, and the front of the seat plate support frame 4 is positioned by the shaft 14. By its own elastic deformation action, the seat is supported so as to be displaceable rearward and downward with respect to the shaft 14 as a reference. Therefore, unlike the conventional seat in which the front and rear of the seat are all supported via the elastic body, the displacement of the seat due to the seating behaves unconstrained and the operation does not become unstable.
[0013]
The seat support frame 4 is formed in an annular shape having a large hole 45 in the center, which gives the support frame 4 flexibility in the left-right direction or the like, and is easy to deform. This is because the bending deformation is received in the hole 45.
[0014]
The seat S in the present invention is formed as follows as an example. In FIG. 1, reference numeral 5 denotes an outer shell that forms the lower surface side of the seat S mounted on the upper surface of the seat support frame 4 and is made of a synthetic resin having elasticity provided with an appropriate number of slits 51 parallel to the front-rear direction. is there. On the other hand, in FIG. 2, 6 is a synthetic resin inner shell provided with a slit 61 intersecting with the slit 51 of the outer shell 5, and as an example, a cushion material 7 obtained by needling processing of recycled PET fiber is interposed. In addition, the cushion material 7 is stretched and wrapped around the inner shell 6 by an appropriate upholstery 8 to form an example of the seat S.
[0015]
The seat S is mounted by superimposing the inner shell 6 on the outer shell 5 and engaging the shells 5 and 6 in a stacked state by pinup fasteners or the like and fixedly placing them on the seat support frame 4. Mounted and supported on the member 1. In the illustrated example, the periphery of the outer shell 5 is fixed to the seat support frame 4 with a bolt 52 or the like, so that the outer shell 5, the inner shell 6, the cushion material 7, The seat S including the upholstery 8 is supported on the seat mounting member 1 in a mounted state. In the above example, the seat support frame 4 and the outer shell 5 are separate structures. However, in the present invention, the outer peripheral portion of the outer shell 5 is formed into an integral structure that performs the function of the seat support frame 4, A structure in which the support frame 4 is not used may be employed. Further, the structure of the seat S to which the support mechanism of the present invention can be applied is not limited to the seat S in the above example.
[0016]
The chair seat support mechanism of the present invention configured as described above includes the seat mounting member 1 having a front member 11 and a rear member 12 connected to each other by a shaft 13, and the front member 11 as a rear member. A structure in which an elastic body 3 is interposed between the rear left and right sides of the rear member 12 and the rear side of the seat support frame 4 while being formed so as to be capable of rotating at an appropriate angle via the elastic body 2 at the twelve connecting portions. Therefore, the seat S including the inner shell 6, the outer shell 5, and the like supported by the seat mounting portion 1 via the support frame 4 receives a shocking load applied at that moment when a person is seated on the seat S. The shock is effectively absorbed because it is transmitted to the elastic bodies 2 and 3 through the shells 5 and 6 and the seat support frame 4 or through the shells 5 and 6.
[0017]
Further, when the load is biased toward the front of the seat, the elastic load is mainly received by the elastic body 2, and when the load is biased to the rear, the elastic body 3 is mainly received by the elastic body 2. Even if the load is unevenly distributed on the seat S, the seat S can be operated corresponding to this, and the left, The flexure of the right elastic body 3 and the elastic annular seat support frame 4 and the inner and outer shells 5 and 6 act to operate corresponding to these unbalanced loads.
[0018]
【The invention's effect】
This invention is as above-mentioned, Comprising: The seat mounting member which connected the front side member so that the front side member and the rear side member were able to incline forward by interposing an elastic body between the front side member and the rear side member. The side member is attached to the upper end portion of the leg support, and the front end portion of the seat rear surface is pivotally supported at the front end portion of the front side member, and between the rear end side of the seat rear surface and the rear upper surface of the rear member. Since the seat is supported by the seat mounting member by sandwiching the elastic body, the structure is simple, easy and inexpensive, and it is possible to produce and provide a chair equipped with this support mechanism. It is possible to provide a chair that can flexibly cope with a change or displacement of a load due to a change in time or sitting posture and has a good seating comfort.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating components of the chair seat support mechanism according to an embodiment of the present invention in an isolated manner.
FIG. 2 is a perspective view showing components of the seat separately for explaining an example of the structure of the seat.
FIG. 3 is a side view showing a part of an example of the seat support mechanism of the present invention in section.
FIG. 4 is a cross-sectional view of an example of an elastic body.
FIG. 5 is a side view of an example of a chair provided with the support mechanism of the present invention.
[Explanation of symbols]
A Leg support 1 Seat mounting member
11 Front member
12 Rear members 2, 3 Elastic body 4 Seat support frame 5 Outer shell
51 Slit 6 Inner shell
61 Slit 7 Cushion material 8 Upholstery

Claims (4)

A seat mounting member in which an elastic body is interposed between both the front member and the rear member so that the front member is pivotably tilted by a horizontal axis in the left-right direction of the seat, and the upper end of the leg strut in the rear member The front end of the seat rear surface is pivotally supported at the front end of the front member, and an elastic body is sandwiched between the rear end side of the seat rear surface and the rear upper surface of the rear member. A chair seat support mechanism, wherein the seat mounting member supports the seat. 2. The chair seat support mechanism according to claim 1, wherein the seat back surface is a seat support frame in which the seat is fixedly mounted on the top surface or an outer shell of the seat. The chair seat support mechanism according to claim 1, wherein the seat back surface is an outer shell of the seat formed so as to also serve as a seat support frame. 4. The chair seat support mechanism according to claim 2, wherein the seat includes an outer shell, an inner shell, and a cushioning material, and the outer shell and the inner shell have slits that intersect with each other.

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