JPH0334107Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is an anti-static device that gradually discharges and removes static electricity that has been charged on a user in a desk, especially a desk on which office automation equipment such as a computer can be placed. Regarding.

Conventional Technology Recently, synthetic resin pile carpets are increasingly being laid on the floor surfaces of rooms and hallways in offices and the like, but human bodies that walk on the carpets are exposed to a considerable amount of static electricity due to friction. is known to be dielectric.

Such static electricity on the human body is not at all desirable, as it gives the human body a severe electric shock due to rapid discharge when it comes into contact with a conductive object such as a metal doorknob. Additionally, static electricity is extremely harmful to office automation equipment such as computers. That is,
If an operator's body is charged with a large amount of static electricity, it can flow from the fingertips to the equipment, causing serious malfunctions or failures.

Therefore, in order to prevent malfunctions and failures of electric shocks and office automation equipment caused by such static electricity, carpets that are laid on the floor have traditionally been made of antistatic materials that do not easily induce static electricity. This is being done in some places.

Problems that the invention aims to solve: However, antistatic carpets are not only extremely expensive in practice, but even when antistatic carpets are installed, they operate on extremely weak batteries. It has not been possible to completely eliminate the risk of such malfunctions occurring in office automation equipment. In addition, a highly conductive chair mat is installed under the chair where a computer operator or the like sits, and static electricity from the human body is removed through the mat. It was not sufficient in these respects.

Therefore, in view of the above circumstances, this invention aims to provide an inexpensive and effective preventive measure against malfunctions of electric shocks and office automation equipment caused by static electricity.

Means for Solving the Problems This invention achieves the above-mentioned purpose by forming at least a part of the seating side of the desk top plate or its edging member from a conductive material, and in which the desk is placed in an ungrounded state. At the same time, this desk and an antistatic mat laid on the floor without grounding,
The gist of the present invention is a desk antistatic device that is electrically connected through direct contact or wiring.

Embodiments Hereinafter, this invention will be explained based on illustrated embodiments.

1 and 2 show a first embodiment of this invention. In the figure, 1 is a desk body made of steel, 2 is a top plate with a top plate 2b made of a melamine decorative board attached to the top surface of a base plate 2a made of a honeycomb-structured iron plate, and 3 is a top plate laid on the floor. This is a rectangular antistatic mat on which a desk body 1 is placed.

A edging member 4 having a substantially U-shaped cross section is fitted to the side portion 2c of the top plate 2 by an appropriate fixing means such as adhesive, while maintaining contact with the substrate 2a at least in part over almost the entire circumference. It is installed in the correct condition. This edging member 4 is for removing static electricity from the human body by coming into contact with a part of the human body, and is made of carbon fiber, metal fiber, metal powder,
It is made of conductive resin containing conductive filler such as carbon powder. The edging member 4 is electrically connected to the iron support leg 1a via the substrate 2a.

As shown in FIG. 3, the antistatic mat 3 includes a pile base fabric 6 in which a pile 5 is implanted, a part of which is conductive fiber 5a and most of which is non-conductive fiber 5b such as polyamide. It is composed of a conductive backing layer 7 integrated on the back surface thereof, and a non-conductive flexible base material layer 8 made of rubber or synthetic resin integrated in a laminated manner on the back surface. The conductive fiber 5a may be made of a single filament such as carbon fiber or metal fiber, or a synthetic resin may be mixed with conductive powder such as carbon powder or metal powder, or the surface layer may be mixed with conductive powder such as carbon powder or metal powder. It is also possible to use fibers in which only the conductive portion or the core portion is conductive. Furthermore, the conductive backing layer 7 is made of natural rubber, SBR,
A flexible material made of rubber such as NBR or various synthetic resins such as PVC mixed with a conductive filler 7a similar to that of the edging member 4 is preferably used.

FIG. 4 shows a second embodiment of this invention. In the figure, reference numeral 9 denotes an antistatic mat laid on the floor surface on the seating side of the desk body 1, similar to that of the first embodiment, with a convex shape such that one side is located below the top plate 2 of the desk body 1. The antistatic mat 3 has the same cross-sectional structure as the antistatic mat 3 of the first embodiment. On the other hand, a protective cap 10 made of a non-conductive material such as rubber is fitted to the lower end of each support leg 1a of the desk body 1, so as to be insulated from the floor surface. The lower part of one support leg 1a and the antistatic mat 9 are electrically connected by a wiring 11.

In the configuration of the above embodiment, since the desk main body 1 which is in an ungrounded state is electrically connected to the antistatic mats 3 and 9, a user who is charged with static electricity may touch the edge member 4 of the top plate 2. When this occurs, only a part of the electric charge is transferred to the desk main body 1 and the antistatic mats 3 and 9, so that no sudden discharge occurs and no severe electric shock is given to the user. In addition, if office automation equipment such as a computer is placed on the top plate 2, the desk body 1 is not directly grounded to the floor, so a user who is charged with static electricity may come into contact with the equipment. However, there is no risk that a sudden discharge current will flow inside the device, and malfunctions and failures due to this current are prevented. Moreover, in the manner described above, the desk body 1 is
The charges transferred to the antistatic mats 3 and 9 are gradually dissipated and removed by corona discharge by the antistatic mats 3 and 9. Therefore, the static electricity charged on the user gradually decreases each time the user comes into contact with the edging member 4, and is finally completely dissipated and removed. In the second embodiment, when the user places a chair on the antistatic mat 9 and sits on it, charges are transferred to the antistatic mat 9 through the chair or directly from the worker's legs. Therefore, static electricity can be dissipated and removed more quickly.

In the above embodiment, the surface of the top plate 2 of the desk body 1 is the upper plate 2b which is non-conductive, but instead of making the border member 4 conductive, the top plate 2
The entire surface may be made of rubber or synthetic resin containing a conductive filler, or may be made of a metal plate to have conductivity. Further, even when the edging member 4 is provided, it is not necessary to provide it all around the top plate 2, and it is sufficient to provide it at least only on the seating side, that is, on the front side where the user has many chances to touch it.

On the other hand, as an antistatic mat, in addition to the one that is insulated from the floor surface due to the presence of the base material layer 8 as described above, in this invention, the base material layer 8 has the structure shown in the third figure. It is also possible to use one in which conductive filler is mixed into rubber or soft synthetic resin. In other words, since these have limited conductivity to the floor surface, charge is dissipated to the floor surface by direct conduction along with the aforementioned corona discharge, but the degree of dissipation is slow, so in the case of the above embodiment. The same effect can be obtained.

Effects of the invention According to the anti-static device for a desk according to this invention, even if a user with static electricity touches the desk top or edging member, a sudden discharge will not occur, and the user will not be at risk of receiving an electric shock. There is no such thing. Furthermore, the charge transferred to the desk and the antistatic mat due to the above contact is gradually dissipated and removed from the antistatic mat. Therefore, static electricity is eliminated every time the user unconsciously touches the desk.
On the other hand, even if office automation equipment such as a computer is placed on a desk, static electricity carried by the user will not cause a sudden discharge current to flow inside the equipment, resulting in malfunctions and failures due to the static electricity. will be prevented. In addition, this antistatic device does not require special control equipment, and has a simple structure that simply electrically connects a desk commonly used in an office etc. to a small area antistatic mat. Since there is no need to install an antistatic carpet as in the conventional case, the cost can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the first embodiment of the desk antistatic device according to this invention, Fig. 2 is an enlarged sectional view showing the attached state of the edging member, and Fig. 3 is a cross section of the main part of the antistatic mat. FIG. 4 is a perspective view showing a second embodiment of the desk electricity suppressing device according to this invention. DESCRIPTION OF SYMBOLS 1... Desk body, 2... Top plate, 3... Antistatic mat, 4... Edging member, 9... Antistatic mat, 11
……wiring.

Claims (1)

[Scope of utility model registration request] At least a part of the seating side of the top plate of the desk or its edge member is formed of a conductive material, and the desk is disposed in a non-grounded state, and the desk,
An antistatic device for a desk, characterized in that an antistatic mat is laid on the floor without grounding and is electrically connected through direct contact or wiring.