JP3054602B2 - Chair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair capable of effectively preventing itself from being charged.

[0002]

2. Description of the Related Art Conventionally, there are many cases where charging of a chair poses a problem. As a cause of such a charging phenomenon, a dielectrically polarized charge is generated by frictional sliding between a human body and a seat or a back portion while a person is sitting on a chair, and when the person leaves the chair, the seat or the back. There are cases where electric charges remain on the backrest and become charged, and cases where electric charges flowing through a human body from OA equipment introduced in large quantities in offices and the like recently accumulate in a chair and become charged. Then, when the chair is charged in this way, for example, the electric charge is discharged through the human body at the moment when the person who is going to sit on the chair next touches the chair, and it is not uncommon for the person to feel discomfort or more shock .

[0003] In recent years, as a measure for preventing such electrification of the chair, a cushion material is placed on a seat plate having a substantially uniform thickness as a whole, and a position for covering the cushion material is adopted. There is known a structure in which a conductive upholstery is disposed on a ground, and a part of the upholstery is grounded.

[0004]

However, when the load is backed up on the seat plate in this way, the cushion material must be made somewhat thicker in consideration of the elasticity of the seat, and the seat plate is also required to be thick. It is necessary to have a size approximately corresponding to the area of the seat. For this reason, there are disadvantages that the material cost is increased and the seat cannot have a smart appearance. In addition, when the electric charge on the ground upholstery is positively eliminated through the grounding point, the movement of the electric charge is easily hindered if a cushion material is attached to the lower surface of the upper upholstery. Since it is not open to the space, it cannot rely on corona discharge, and there is a problem that a high static elimination effect cannot be expected.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an effective antistatic function and static elimination function to a seat with as few parts as possible.

That is, a chair according to the present invention comprises a seat having a seat frame having an opening in the center, and a conductive elastic seat member stretched at a position to close the opening. And the lower surface of the elastic sheet member has fluffing.
Characterized in that it is in. According to this structure, the seat can be provided with effective elasticity by freely bending in a vertical direction at the opening of the elastic sheet member stretched on the seat frame. Therefore, a comfortable feeling of use can be imparted to the seat without using a thick cushion material. In addition, since an extra member such as a cushion material is not attached to the lower surface of the elastic sheet member, it is possible to effectively reduce the physical hindrance when the charge is going to move. Direct corona discharge can also be promoted .

In order to expect a high static elimination effect, the upper surface of the elastic sheet member is exposed so that a human body can come into direct contact therewith, and at least a part of the elastic sheet member is grounded to a grounding frame or a grounding point provided around the seating frame. It is effective to connect them electrically. In this case, it is desirable to make the upper surface of the elastic sheet member fluffed in order to more effectively perform the current collecting operation from the human body to the elastic sheet member.

In order to be able to freely adjust the appearance of the chair while ensuring at least the antistatic function, the upper surface of the elastic sheet member is covered with an upholstery material, and the electric charge of the upholstery material is transferred to the elastic sheet member. What is necessary is just to make it collect electricity. In this case as well, if the upper surface of the elastic sheet member has fluffing, the electric charge moves efficiently from the upholstery ground to the elastic sheet member side through the contact portion between the elastic sheet member and the upholstery ground, At least, the effect of preventing static electricity on the overlaid ground can be enhanced. In addition, since the material of the upper-layered ground itself is not limited, a degree of freedom in pursuing a feeling of use and appearance can be secured.

In order to effectively obtain the static elimination effect even when the overhanging ground is employed, at least a part of the elastic sheet member must be electrically connected to a grounded seat frame or a grounding portion provided around the seat frame. I just need.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. The chair shown in FIGS. 1 and 2 has a chair body 1 to which a seat 2 is attached while taking measures against static electricity. The chair body 1 has a pair of left and right front legs 11 each having a caster 11a attached to a lower end thereof, an upper end extending linearly upward and rearward, and rigidly connected to lower surfaces of both ends of a horizontal member 12, and a caster 1 at a lower end.
3a, a pair of left and right rear legs 13 each having an upper end curving and extending upward and forward and having an intermediate portion rigidly connected to the upper surface of the horizontal member 12.
1. The independence is given by the horizontal member 12 and the rear leg 13. A seat receiving portion 14 is supported on the upper end of the rear leg 13. The seat receiving portion 14 includes a front edge portion 14a, a rear edge portion 14b, and a side edge portion 14c formed by bending a pipe member into an endless frame shape, and a reinforcing bar 14d which is laid between the side edge portions 14c. , Front edge 14a and reinforcing bar 14
d and a pair of brackets 14e supported in a face-to-face state at a fixed distance from each other, and both brackets 14e are supported on the upper end of the rear leg 13 so as to be freely movable via a support shaft 13b. Let me.

A back support rod 15 is provided on the horizontal member 12 so as to extend rearward and upward from a position substantially continuous with the upper end of the front leg 11. The back support rod 15 is fixed at its lower end to a not-shown torsion bar housed inside the horizontal member 12, and can be tilted backward while twisting the torsion bar. The backrest 3 is mounted on the upper end of the rod 15, and the rear edge 14 b of the seat receiving portion 14 is suspended at the center of the lower edge of the backrest 3 via a hinge member 31 so as to be able to perform a locking operation.

The seat receiving portion 14 and the rear leg 13 are made of a metal pipe material.
The seat receiving portion 14 is electrically connected to the floor via the rear legs 13 and the casters 13a, and serves as a grounding point around the seat frame according to the present invention. ing. The seat 2 is attached to the seat receiving portion 14. 3 is a bottom view of the seat 2 in an attached state, FIG. 4 is an end view taken along the line IV-IV in FIG. 3, FIG. 5 is a bottom view of the seat 2 with the seat 2 removed from the seat receiving portion 14, and FIG. FIG. 4 is a plan view of the seat 2 with a later-described upper upholstery 23 removed. That is, the seat 2 is made of synthetic resin and has a seat frame 21 having an opening 21a at the center.
An elastic sheet member 22 which is disposed at a position on the upper surface side of the housing 1 at which the opening 21a is closed and which is stretched by attaching a peripheral edge to the periphery of the opening of the seat frame 21; And an upper upholstery 23 which is wrapped together with the sheet member 22 and has a peripheral portion held at a position wound around the lower surface of the seat frame 21.
A material 2 having conductivity and having fluff on the upper surface side and the lower surface side is used for 2. Of course, it is needless to say that the elastic sheet member 22 has a certain effective tensile strength in the plane direction. Then, the engaging claws 21b and 21c are respectively suspended from two lower edges on the front edge side and one lower surface on the rear edge side of the seat frame 21, and these engaging claws 21b and 21c are respectively positioned in front of the seat receiving portion 14. The seat 2 is attached to the seat receiving portion 14 by being engaged with the edge portion 14a and the rear edge portion 14b from inside.

Further, in this embodiment, the elastic sheet member 22 is electrically connected to the seat receiving portion 14 by an appropriate means. For example, the seat frame 2
1 and the elastic sheet member 22 are provided with a screw insertion hole 4 as shown in FIG. 6, and a screw (not shown) is inserted into the screw insertion hole 4 and fastened to the side edge 14 c of the seat receiving portion 14. The head of the screw is brought into close contact with the elastic sheet member 22, the tip of the screw is brought into close contact with the seat portion 14, and the elastic sheet member 22 is electrically connected to the seat portion 14, which is a ground point around the seat frame. No. Of course, if this is done, the seat frame 2
Needless to say, the effect of firmly fixing the base member 1 to the seat receiving portion 14 is obtained. In addition to the above structure, the peripheral portion 22a of the elastic sheet member 22 is further rolled from the position shown in FIG. The method is arbitrary, such as directly contacting the edge portion 14c, or using the seat receiving portion 14 itself as a grounded seat frame and directly stretching the elastic sheet member 22 thereon.

In the chair of the present embodiment having the above-described structure, the elastic sheet member 22 stretched on the seat frame 21 has the opening 2.
Effective elasticity is brought to the seat 2 by flexing freely in the vertical direction in 1a. For this reason, compared to the case where a thick cushion material is placed on a seat plate to constitute a seat, the seat 2 has a thinner and smarter appearance and has an elasticity so that a comfortable feeling of use can be obtained. Can be granted. In addition, since the cushioning material is not attached to the lower surface of the elastic sheet member 22, the material cost can be reduced, and the charge moving through the elastic sheet member 22 at the time of static elimination is prevented by the cushioning material, which is an insulator. Can also be effectively prevented. Furthermore, since the lower surface side of the elastic sheet member 22 is open to the space, it can be expected that the charge of the elastic sheet member 22 is discharged through corona discharge.

In particular, in this embodiment, the upper surface of the elastic sheet member 22 is covered with the upholstery material 23, and the electric charge on the upholstery material 23 side is moved to the elastic sheet member 22 side to collect electricity. Therefore, the material of the upholstery 23 constituting the appearance of the chair is not limited, and a good appearance and a feeling of use can be pursued by free preparation as in the related art. Of course, even if the elastic sheet member 22 is covered with the upholstery ground 23 as described above, the upper surface of the elastic sheet member 22 is made to have fluff, so that the upper ends of the fluff constituting the fluff are spread everywhere. The electric charge existing on the underside of the ground 23 and on the side of the upholstery 23 is efficiently moved to the elastic sheet member 22 through the contact portion. Further, most of the electric charges thus moved to the elastic sheet member 22 side are quickly eliminated through the seat receiving portion 14 which is a grounding portion provided around the seat frame 21 prior to the above-described corona discharge. Not only electric charges generated while a person is sitting but also electric charges introduced by walking and sitting on a carpet can be eliminated with extremely high efficiency.

The specific configuration of each part is not limited to the above-described embodiment. For example, even when the seat receiving portion is not grounded in the above embodiment, at least the electric charge on the upper-layer ground moves to the elastic sheet member side, which can be an effective antistatic measure. In addition, when the appearance and the feeling of use do not matter, in the case of the above-mentioned embodiment, the upper cladding 23 is used.
And the elastic sheet member 22 can be used in a state where the upper surface thereof is directly exposed. With this configuration, since the human body comes into direct contact with the conductive elastic sheet member 22, the movement of electric charges from the human body to the elastic sheet member 22 side is further promoted, and the charge removing effect can be made more effective. it can.

Other configurations can be variously modified without departing from the spirit of the present invention.

[0018]

Since the present invention has the above-described configuration, the following effects can be obtained. That is, the chair of the present invention, a seat, a seat frame having a central opening, to those obtained by including an elastic sheet member having electrical conductivity that is stretched to a position for closing the opening, the elastic Under the seat member
Because of a configuration to one having a fuzz faces, it is possible to impart an effective elasticity to the seat by utilizing the flexure of the elastic sheet member at the opening be formed across the thin eliminating the cushion member. Moreover, since the elastic sheet member is directly opened to the space on the lower surface side, it is possible to eliminate constituent members such as a cushion material which hinder movement of electric charges, and to directly move the elastic sheet member from the elastic sheet member to the lower surface side. A strong corona discharge can be promoted . In addition, if the upper surface of the elastic sheet member is exposed to make the human body directly contactable and at least a part thereof is electrically grounded, charges existing in the human body or the seat can be rapidly eliminated with high efficiency. . When the elastic sheet member has fluff on the upper surface side, the current collecting effect from the human body to the elastic sheet member can be more effectively increased.

Of course, even if the upper surface of the elastic sheet member is covered with the upholstery material, the electric charge of the upholstery material can be collected on the elastic sheet member side. With such a configuration, it is possible to effectively pursue the appearance, feeling of use, and the like of the chair by freely selecting the upholstery ground while ensuring at least the antistatic function.

Also in this case, by providing fluff on the upper surface of the elastic sheet member, the movement of electric charges from the upholstery to the elastic sheet member side can be smoothed, and the current collecting effect can be enhanced. Of course, in this case as well, it is needless to say that positive static elimination can be performed by electrically grounding at least a part of the elastic sheet member.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is a bottom view of the embodiment.

FIG. 4 is an end view taken along line IV-IV in FIG. 3;

FIG. 5 is a bottom view showing the seat of the embodiment.

FIG. 6 is a bottom view showing the seat of the embodiment with the upper covering ground removed;

[Explanation of symbols]

 2 ... seat 21 ... seat frame 21a ... opening 22 ... elastic sheet member 23 ... upper lining

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-67809 (JP, A) JP-A-3-27185 (JP, A) JP-A-60-102899 (JP, U) JP-A-1 72144 (JP, U) Japanese Utility Model Showa 60-114000 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47C 7/02

Claims (6)

(57) [Claims] 1. A seat comprising: a seat frame having an opening in the center; and a conductive elastic sheet member stretched at a position where the opening is closed .
A chair characterized in that the lower surface has fluff . 2. The elastic sheet member according to claim 1, wherein an upper surface of the elastic sheet member is exposed, and at least a part of the elastic sheet member is electrically connected to a grounded seat frame or a grounding portion provided around the seat frame. The described chair. 3. The chair according to claim 2, wherein the upper surface of the elastic sheet member has fluff. 4. The chair according to claim 1, wherein the upper surface of the elastic sheet member is covered with an upholstery. 5. The chair according to claim 4, wherein the upper surface of the elastic sheet member has fluff. 6. The chair according to claim 4, wherein at least a part of the elastic sheet member is electrically connected to a grounded seat frame or a grounding portion provided around the seat frame.