JP2005334098A - Distribution device for oa equipment and table for oa equipment using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distribution device for OA equipment that improve the operational reliability of OA equipment and a table for OA equipment using the same. <P>SOLUTION: A top 1, a rear modesty panel 2, right and left leg plates 3 and 3 are combined and a distribution device 4 for OA equipment incorporating a lightening arresting unit for a commercial power supply is incorporated in one of the leg plates 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is for OA equipment that can improve the operational reliability of OA equipment (office computers including personal computers as well as office equipment including computers such as facsimiles and copiers, hereinafter the same). The present invention relates to a power distribution device and a table for an OA device that uses the power distribution device.

  In office work, a wide variety of OA equipment is used.

Therefore, in order to load OA equipment and use it conveniently, various tables for OA equipment have been proposed and put into practical use. For example, by providing a wiring duct for storing electrical wiring for OA equipment in the table, the electrical wiring is not scattered on the top plate of the table, and the appearance is good, and the electrical wiring is mechanically hooked. Troubles can be prevented beforehand (Patent Documents 1 and 2). It is also known to incorporate a power supply device for OA equipment including a battery into a leg portion of a table (Patent Document 3).
Japanese Utility Model Publication No. 4-12944 Japanese Patent Laid-Open No. 2004-97833 JP 2002-85164 A

  According to the former of the prior art (Patent Documents 1 and 2), the wiring duct simply creates a space for accommodating and disposing the electric wiring, so that external noise that damages the OA equipment, such as a power line, is provided. There was a problem that it was not possible to prevent a lightning surge entering through the cable. On the other hand, in the latter case (Patent Document 3), since a battery independent from the commercial power supply is built in, it is not affected by external noise entering from the power line, but daily maintenance work including battery charging is performed. Is complicated and lacks practicality.

  Therefore, in view of the problems of the prior art, an object of the present invention is for OA equipment that can prevent the introduction of external noise and improve the operational reliability of OA equipment by incorporating a lightning protection unit for commercial power supply. And a table for an OA device using the same.

  The structure of the first invention according to this application for achieving the above object (referring to the invention according to claim 1, the same applies hereinafter) includes an outer frame that can be incorporated in a leg plate of a table for OA equipment, and is housed in the outer frame. A lightning protection unit for commercial power supply, an outlet assembled to the outer frame and connected to the output side of the lightning protection unit, and a mounting grill that exposes the outlet to the front end face of the leg plate and incorporates the outer frame into the leg plate. The gist.

  The outer frame can store a control board that detects the deterioration of the parallel elements of the lightning arrester unit and displays it on the mounting grille, accommodates an auxiliary lightning arrester unit for communication lines, and on the mounting grille, Each modular jack on the input side and output side of the auxiliary lightning protection unit can be exposed.

  The configuration of the second invention (referring to the invention according to claim 4, hereinafter the same) comprises a top plate, left and right leg plates, and a rear curtain plate, and one of the leg plates has an OA according to the first invention. The gist is to incorporate a power distribution device for equipment.

  According to the configuration of the first aspect of the invention, the outer frame can be incorporated into the leg plate with the outlet on the output side of the lightning protection unit exposed to the front end face of the table leg plate via the mounting grill. Therefore, the OA equipment on the table can effectively prevent the lightning surge from the power line through the lightning protection unit by supplying power from the outlet, and may malfunction or be damaged by the lightning surge. Therefore, the operation reliability can be remarkably improved. However, the input side of the lightning protection unit shall be connected to the commercial power supply via an extension cable with a plug, for example, and the extension cable is connected to the input side of the lightning protection unit via a detachable relay connector that is pulled out of the outer frame. It is preferable to connect so that it can be disconnected.

  The lightning protection unit includes a series element including, for example, an inductance element for preventing the passage of a lightning surge current, and a parallel element having a non-linear characteristic such as a zinc oxide element for rapidly discharging the lightning surge current to the ground. Appropriate combinations can be configured. Therefore, since the parallel element may be deteriorated during use, the parallel element can be replaced by providing a control board for detecting the leak current with respect to the commercial power supply voltage and detecting the deterioration and displaying it on the mounting grill. Necessity can be displayed. In addition to connecting the parallel element between each phase of the commercial power supply and the ground, the parallel element can be connected between the respective phases before and after the series element, thereby removing the lightning surge in the differential mode.

  The auxiliary lightning protection unit for the communication line can effectively protect the OA device from lightning surge that enters from the communication line when using the OA device that communicates with the outside via the communication line. Auxiliary lightning protection units are also configured by combining series elements and parallel elements, and lightning surges that are induced from one of the power line and communication line to the other by mechanically assembling with the lightning protection unit for commercial power supply. The possibility of reaching the OA device can be minimized.

  According to the configuration of the second invention, since the power distribution device according to the first invention is incorporated in the leg plate, the OA equipment loaded on the top plate is appropriately protected and the effects of the first invention are easily realized. can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The table for the OA equipment is constructed by assembling the top plate 1, the rear curtain plate 2, and the left and right leg plates 3, 3 together, and incorporating the power distribution device 4 for the OA equipment into one leg plate 3 (FIG. 1). , FIG. 2).

  Each of the leg plates 3 and 3 is formed in an L shape with a lower portion protruding forward, and adjuster bolts 3a and 3a for height adjustment are provided on the lower surface, and a rod for supporting the top plate 1 on the upper end. 3b protrudes forward. The rear surfaces of the leg plates 3 and 3 are connected via a rear curtain plate 2, and a bar 2 a for positioning the top plate 1 is attached to the upper end of the rear curtain plate 2. Therefore, the top plate 1 can be assembled integrally by positioning the rear end via the bar 2a and fixing it on the leg plates 3, 3 and the rods 3b, 3b.

  The power distribution device 4 is incorporated through the mounting grill 4a so as to be housed in the leg plate 3 from the front end surface of one leg plate 3 (FIGS. 2 and 3).

  The power distribution device 4 has a lightning protection unit 10 for commercial power supply, a shield case 4c for auxiliary lightning protection units 20 and 20 for communication lines, a control board 30 and a metal outer frame 4b that can be incorporated in the leg plate 3. (FIGS. 3 and 4) are assembled as a single unit with two outlets 4d and 4d for commercial power that are exposed on the mounting grill 4a. That is, the lightning protection unit 10 and the auxiliary lightning protection units 20 and 20 are integrally incorporated in the common shield case 4c. The mounting grill 4a can incorporate the power distribution device 4 into the leg plate 3 through the mounting screws 4a1, 4a1 so that the outlets 4d, 4d are exposed on the front end surface of the leg plate 3 (FIGS. 2 and 3). The receptacle of each outlet 4d is grounded, and modular jacks 4e and 4e for the communication lines on the input side and output side are exposed on the mounting grill 4a.

  The lightning arrester unit 10 for commercial power supply includes parallel elements A, A... Connected between the phases U and V of the commercial power supply, the phases U and V and the ground, and a serial element B inserted into the phases U and V. (FIG. 5). However, the parallel elements A and A between the phases U and V are arranged before and after the series element B, respectively. Further, the auxiliary lightning protection units 20 and 20 for communication lines are configured in the same manner as the lightning protection unit 10, respectively. However, the type and rating of the parallel element A and the series element B for the auxiliary lightning arrester unit 20 are not the same as the parallel element A and the series element B for the lightning arrester unit 10, and the parallel elements A and series elements B of both are Appropriately selected to meet the required electrical specifications.

  The input side of the lightning protection unit 10 for commercial power is led out to the outside through a relay connector 11 and an extension cable 12 with a grounded plug 13. Each parallel element A on the upstream side of the series element B detects a leak current and guides it to the deterioration determination circuit C. The output of the deterioration determination circuit C is output controlled via the photocoupler 31 in the control board 30. The circuit 32 is connected. The output side of the lightning protection unit 10 is branched and connected to the outlets 4d and 4d via the control board 30, and a current transformer CT for detecting a load current is disposed in the phase V. The output of the current transformer CT is led to the output control circuit 32 via the rectifying / smoothing circuit 33 and the comparison circuit 34.

  In addition to the alarm buzzer BZ, display lamps L1 and L2 exposed on the mounting grill 4a are connected to the output side of the output control circuit 32 (FIGS. 3 and 5). On the mounting grill 4a, a display lamp L3 for displaying the voltage between the phases U and V of the commercial power source and a stop switch SW for the alarm buzzer BZ are exposed together. The stop switch SW is connected to the output control circuit 32. Has been.

  The input side of the auxiliary lightning protection units 20 and 20 for communication lines is drawn out in common to the modular jack 4e on the input side, and the output side is drawn out in common to the modular jack 4e on the output side. Each modular jack 4e on the input side and output side can independently connect two lines corresponding to the auxiliary lightning arrester units 20 and 20. In FIG. 4, the outlets 4d, 4d, the indicator lamps L1, L2, L3, the stop switch SW and the like are attached to one side of the outer frame 4b on the open side (mounting grill 4a side). A chassis 4f is also illustrated.

  When the plug 13 at the tip of the extension cable 12 is connected to a commercial power source, the commercial power source can be supplied to the outlets 4d and 4d via the lightning protection unit 10. That is, the OA device (not shown) loaded on the table top 1 is operated normally by supplying commercial power from the outlets 4d and 4d, and from lightning surges that enter through the power line by the lightning protection unit 10. Can be properly protected. In addition, if a telephone line is connected to the modular jack 4e on the input side and the communication cable of the OA device is connected to the modular jack 4e on the output side, the auxiliary lightning protection unit 20 protects the OA device from lightning surges entering from the communication line. can do. Note that the auxiliary lightning protection units 20 and 20 for communication lines can be used for communication of a plurality of different OA devices. Further, the fact that the commercial power is normally supplied is displayed on the display lamp L3 on the mounting grill 4a.

  If the load current detected via the current transformer CT is excessive, the control board 30 detects this via the comparison circuit 34, operates the alarm buzzer BZ via the output control circuit 32, and displays the indicator lamp L2. Lights up. Further, if any of the parallel elements A, A... On the front stage side of the lightning protection unit 10 deteriorates and the leakage current becomes excessive, an output signal of the deterioration determination circuit C is generated, and the output control circuit 32 via the photocoupler 31 is generated. The alarm buzzer BZ is activated and the display lamp L1 is lit. The alarm buzzer BZ can be stopped by operating the stop switch SW. However, the display lamps L1 and L2 continue to be lit unless the respective lighting causes disappear.

  In the above description, the outer frame 4b may be formed in a box shape by attaching one or both of a bottom plate and a lid plate. The outer frame 4b is preferably made of an iron plate having a shielding effect.

Whole structure exploded perspective view Main part enlarged perspective view (1) Main part enlarged perspective view (2) Main part enlarged perspective view (3) Overall electrical diagram

Explanation of symbols

A ... Parallel element 1 ... Top plate 2 ... Rear curtain plate 3 ... Leg plate 4 ... Power distribution device 4a ... Mounting grill 4b ... Outer frame 4d ... Outlet 4e ... Modular jack 10 ... Lightning protection unit 20 ... Auxiliary lightning protection unit 30 ... Control board

Patent applicant Morinaga Electronics Co., Ltd.
Attorney Tadaaki Matsuda, Attorney

Claims (4)

  An outer frame that can be incorporated into a leg plate of a table for OA equipment, a lightning protection unit for commercial power supply housed in the outer frame, an outlet assembled to the outer frame and connected to the output side of the lightning protection unit, A power distribution device for OA equipment, comprising an attachment grill that exposes an outlet on a front end surface of a leg plate and incorporates the outer frame into the leg plate.   2. The power distribution device for OA equipment according to claim 1, wherein a control board for detecting deterioration of parallel elements of the lightning protection unit and displaying on the mounting grill is stored in the outer frame.   The auxiliary lightning protection unit for communication lines is housed in the outer frame, and modular jacks on the input side and output side of the auxiliary lightning protection unit are exposed on the mounting grill. The power distribution apparatus for OA equipment according to claim 2. A top plate, left and right leg plates, and a rear curtain plate are provided, and a power distribution device for OA equipment according to any one of claims 1 to 3 is incorporated in one of the leg plates. A table for OA equipment.

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