JP2008086093A - Electrical facility equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent charging by grounding a rear plate to a body part for safety, and also to dispense with the complicated work at attachment and detachment of the rear plate. <P>SOLUTION: A metal fitting 3 for grounding is attached to the rear side of the rear plate 1b, corresponding to one point out of the internal thread parts 1c of the body 1a with a screw 4 so that its recess 3b lies upon the small-diameter part of the hooking hole 1d of the rear plate 1b, and a thumbscrew 2, threaded into the recess 3b and the hooking hole 1d, is screwed into the internal thread part 1c of the body 1a, whereby the grounding metal fitting 3 and the rear plate 1b are fastened to the body 1a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to electrical equipment such as a switchboard.

  In electrical equipment such as switchboards delivered to electric power companies, government offices, and private companies, when the back side is not a door but a back plate, the back plate is not grounded for safety, or the back plate is used for electrical equipment. Safety grounding was achieved by connecting the main body with a safety grounding wire.

In addition, as prior art document information related to the invention of this application, there is Patent Document 1, which facilitates grounding work of a plurality of units housed in an outer case of a switchboard.
JP-A-9-205705

  In electrical equipment, when the back plate is not grounded for safety, the back plate may not be electrically connected to the main body due to the presence of paint, nylon washers, etc., and the back plate may be charged. Also, when the back plate is connected to the main body with a safety ground wire and secured, it is necessary to remove the safety ground wire when attaching or removing the back plate, which complicates the work and, in some cases, disconnects the safety ground wire. There was also the possibility of doing.

  The present invention has been made to solve the above-described problems, and reliably prevents the charging of the back plate by grounding the back plate, and it is troublesome to remove the safety ground wire when the back plate is attached or detached. The object is to obtain electrical equipment that can eliminate the need for work.

  The electrical equipment according to claim 1 of the present invention is an electrical equipment in which the back plate is fastened to a female screw portion provided at a plurality of locations of the main body portion by a thumbscrew inserted through the hooking hole. Attach the grounding metal fitting to the back side of the back plate corresponding to one of them so that the concave part overlaps the hooking hole on the back plate, and the thumbscrew inserted through the concave part and the hooking hole on the female screw part of the main body part The grounding metal fitting and the back plate are fastened to the main body by screwing.

  As described above, according to the present invention, the grounding bracket is attached to the back side of the back plate, and the grounding bracket and the back plate are fastened to the main body by the thumbscrews, so that the back plate is securely grounded to the main body. Thus, the charging can be prevented. Further, it is possible to eliminate a complicated operation such as removing the safety grounding wire when the back plate is attached or detached.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) are a perspective view of an electrical equipment device according to an embodiment of the present invention viewed obliquely from behind and an enlarged exploded view of a portion A, wherein 1 is an electrical equipment device, and 1a is an electrical equipment. It is a main body part from which the back side of the equipment device 1 is removed, and two back plates 1b are attached to the back side of the main body part 1a. On the back side of the main body 1a, four female screw portions 1c are provided for one back plate 1b, and the back plate 1b is provided with hook holes 1d corresponding to the respective female screw portions 1c. The hole 1d is formed in a bodice shape with a small diameter part and a large diameter part. When attaching the back plate 1b, after screwing the thumbscrews 2 into the respective female screw portions 1c of the main body 1a, the large diameter portions of the respective hooking holes 1d of the back plate 1b are inserted into the thumbscrews 2 and the thumbscrews are inserted. The small-diameter portion of the hooking hole 1d is fitted into the second screw portion 2a, and the thumb screw 2 is fastened to the female screw portion 1c to fix the back plate 1b to the back side of the main body portion 1a.

  Here, the safety grounding structure of the back plate 1b will be described. The back plate 1b is fastened to the four female screw portions 1c of the main body portion 1a with the thumbscrews 2. The grounding metal fitting 3 plated on the back side of the back plate 1b corresponding to one of the female screw portions 1c of the back plate 1b 2 It attaches with the screw 4 of a book. That is, the grounding metal fitting 3 is attached to the back side of the back plate 1b by inserting the two screws 4 into the insertion holes 3a of the grounding metal fitting 3 and tightening them in the tap holes 1e provided in the back plate 1b. The grounding metal fitting 3 is displayed as grounding. The grounding metal fitting 3 is provided with a recess 3b, the recess 3b is attached so as to overlap the small diameter portion of the hooking hole 1d, and the thumbscrew 2 inserted through the small diameter portion of the recess 3b and the hooking hole 1d is screwed into the female screw portion 1c. By joining, the grounding metal fitting 3 and the back plate 1b are fastened to the main body 1a. In tightening the thumbscrew 2, a nylon washer or the like is not used.

  In the above-described configuration, the grounding metal fitting 3 is attached to the back plate 1b by tightening the screw 4, and the two are electrically connected. The grounding metal fitting 3 is connected to the main body via the thumbscrew 2 by tightening the thumbscrew 2. The part 1a is brought into conduction, and the safety grounding of the back plate 1b is performed.

  In the above-mentioned best embodiment, the grounding metal fitting 3 is attached to the back side of the back plate 1b, and the grounding metal fitting 3 and the back plate 1b are fastened to the main body 1a by the thumbscrew 2, and the back plate 1b is attached to the main body. It is possible to prevent grounding by securely grounding to 1a, and to perform grounding without the operator being particularly conscious of the grounding. In addition, it is possible to eliminate the need for complicated work such as removing the safety grounding wire when the back plate 1b is attached or detached.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an electrical equipment device according to an embodiment of the present invention and an enlarged view of a part A thereof.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electrical equipment 1a ... Main-body part 1b ... Back plate 1c ... Female thread part 1d ... Hooking hole 1e ... Tap hole 2 ... Thumb screw 3 ... Metal for grounding 3a ... Insertion hole 3b ... Recessed part 4 ... Screw

Claims (1)

  In electrical equipment that tightens the back plate with female screws provided at multiple locations on the main body with thumbscrews inserted into the hooking holes, on the back side of the back plate corresponding to one of the internal threads on the main body Attach the grounding bracket so that the concave portion overlaps the hooking hole on the back plate, and screw the thumbscrew inserted through the concave portion and the hooking hole into the female screw portion of the main body to connect the grounding bracket and the rear plate. Electrical equipment that is fastened to the main body.

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