Electric apparatus

Abstract

To provide an electric apparatus in which a connection part of a cable and a circuit board is not exposed when a front cover is removed from a base board.SOLUTION: A connection part of a terminal 12a to which a cable drawn into the inside of a body case 2 is connected is covered, while a front cover 5 is being removed in the body case 2, and a middle cover 4 is built in to expose a voltage detector hole 14 of the terminal 12a. The connection part of a cable and a circuit board 13 is not therefore exposed even if the front cover 5 is removed from the base board 3, and the voltage detector work can be done easily and safely.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to electrical equipment such as an alarm device that notifies the occurrence of, for example, an electric leakage current or an overcurrent. [Background technology]

[0002] Conventionally, an example of an electrical device is an alarm device that notifies the occurrence of an electric leakage or an overcurrent (for example, Patent Document 1). Such electrical devices have a main body case formed by assembling a base and a front cover that covers the front of the base, and the main body case is often installed on a wall when used. In such general electrical devices that are installed on a wall, a cable that is wired inside or along the wall is pulled into the main body case and connected to a circuit board arranged inside the main body case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-77334 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional electrical equipment such as that described above, when the front cover is removed from the base, the connection between the cable and the circuit board becomes exposed, which poses problems in terms of safety, such as making voltage detection work cumbersome.

[0005] Therefore, the present invention has been made in consideration of the above problems, and aims to provide an electrical device in which the connection between the cable and the circuit board is not exposed even when the front cover is removed from the base. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the invention described in claim 1 of the present invention is an electrical device comprising a circuit board having a terminal mounted on the front side within a main case having a base and a front cover assembled to cover the front of the base, the terminal having a connection portion to which a cable to be pulled into the main case is connected and a voltage detection hole, while a middle cover is assembled within the main case, covering the connection portion and exposing the voltage detection hole when the front cover is removed. The invention as recited in claim 2 is the invention as recited in claim 1, wherein the middle cover includes an electric unit electrically connected to the circuit board. Effect of the Invention

[0007] According to the present invention, the terminal is provided with a connection part to which the cable drawn into the main case is connected and a voltage detection hole, while the middle cover is attached inside the main case to cover the connection part and expose the voltage detection hole when the front cover is removed. Therefore, even if the front cover is removed from the base, the connection part between the cable and the circuit board is not exposed, and voltage detection can be performed easily and safely. In addition, according to the invention described in claim 2, the electrical unit electrically connected to the circuit board is one component of the middle cover, thereby streamlining the structure and enabling space saving within the main body case and miniaturization of the main body case, etc. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective explanatory view showing the earth leakage alarm device from the front. [Diagram 2] FIG. 2 is a perspective view showing the earth leakage alarm device in a disassembled state. [Diagram 3] FIG. 11 is an explanatory diagram showing the state in which the front cover is removed, as viewed from the front. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An earth leakage alarm device according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[0010] Fig. 1 is a perspective explanatory diagram showing the earth leakage alarm device 1 from the front. Fig. 2 is a perspective explanatory diagram showing the earth leakage alarm device 1 in a disassembled state. Fig. 3 is an explanatory diagram showing the earth leakage alarm device 1 from the front with the front cover 5 removed. The earth leakage alarm device 1 comprises a main body case 2 incorporating an alarm mechanism that is activated when an earth leakage occurs. The main body case 2 has a base 3, a middle cover 4 attached to cover the front of the base 3, and a front cover 5 attached to cover the further front of the middle cover 4. The earth leakage alarm device 1 is installed on an installation surface such as a wall with the rear surface of the main body case 2, i.e., the rear surface of the base 3, facing the installation surface.

[0011] The base 3 is formed in a square box shape that opens forward, and includes a rear plate that is generally rectangular when viewed from the front, and a rear peripheral wall that stands forward along the upper side, left and right sides, and lower side of the rear plate. In addition, an inlet 11 is opened in the center of the rear plate of the base 3 for drawing a cable extending from the wall side into the main body case 2. In addition, a circuit board 13 on which a terminal unit 12 to which a cable is connected is mounted is screwed around the inlet 11 on the surface of the rear plate inside the base 3. The terminal unit 12 is composed of a plurality of terminals 12a, 12a... arranged in parallel in the left-right direction, and is disposed above the inlet 11. Each terminal 12a is oriented so that the connection port that serves as the connection portion with the cable faces downward. In addition, a voltage detection hole 14 that opens forward is provided at the upper end of each terminal 12a. Also provided on the circuit board 13 are a power conversion circuit storage section 15 which incorporates a power conversion circuit (not shown), a buzzer 16 which is an element of the alarm mechanism which sounds an alarm when a ground fault occurs, and a connector 17 to which an alarm device 22 on the middle cover 4 (described later) is electrically connected.

[0012] The middle cover 4 is provided with a leg 21 made of synthetic resin standing forward, and an alarm device 22 supported on the front end of the leg 21. The alarm device 22 is one element of the alarm mechanism, and on the front side of the alarm device 22 are provided status display LEDs 23, 23 that are normally lit in green but are lit or flashing in red when a ground fault occurs, and changeover switches 24, 24 for switching the operation mode when a ground fault occurs. Also, on the front side of the alarm device 22, a reset switch 25 for resetting the operation state and a test switch 26 for checking the operation when a ground fault occurs are also provided. Meanwhile, the leg 21 is provided with a lower side that protrudes downward from the alarm device 22, and a buzzer stop button 27 for stopping the operation of the buzzer 16 is provided on the lower side. Also, the leg 21 is provided with an upper side that protrudes upward from the alarm device 22, and a notch 28 cut downward is provided at a position directly above the alarm device 22 on the upper side. The left-right length of this cutout 28 is longer than the left-right length of the terminal unit 12. Such a middle cover 4 is screwed to the surface of the base 3 with the rear ends of the legs 21 abutting against the surface of the circuit board 13. When the middle cover 4 is screwed to the surface of the base 3 in this manner, as shown in Fig. 3, the inlet 11 and the lower parts of the terminals 12a, 12a... (i.e., the cable connection parts) are covered by the middle cover 4, particularly the alarm device 22, while the voltage detection holes 14, 14... of the terminals 12a, 12a... are exposed within the cutout 28.

[0013] The front cover 5 is formed in a rectangular box shape that opens to the rear, and includes a front plate that is generally rectangular when viewed from the front, and a front peripheral wall that stands rearward along the upper side, left and right sides, and lower side of the front plate. A window 31 for exposing the front of the alarm device 22 is opened in the approximate center of the front plate, and a transparent door 32 for opening and closing the window 31 is attached so as to be able to open in one direction. A button opening 33 for exposing the buzzer stop button 27 is opened in the lower part of the front plate. Furthermore, locking claws 34, 34·· that protrude rearward are provided on the upper and lower sides of the front peripheral wall. The front cover 5 is assembled to the base 3 in a state in which it covers the middle cover 4, the voltage detection holes 14, 14·· of the terminal unit 12, the buzzer 16, etc., by abutting the rear end of the front peripheral wall against the front end of the rear peripheral wall of the base 3 and locking the locking claws 34, 34 to the rear peripheral wall of the base 3. Furthermore, with the installation of the front cover 5, the alarm device 22 is exposed in the window 31, and the user can see the status display LEDs 23, 23 through the door 32. When operating the changeover switch 24, the reset switch 25, etc., the door 32 can be opened to operate them. Reference numeral 35 denotes a slit for an alarm sound.

[0014] According to the earth leakage alarm device 1 having the above-mentioned configuration, when the front cover 5 is removed, the middle cover 4 is attached inside the main body case 2, which covers the connection portion of the terminal 12a and exposes the voltage detection hole 14. Therefore, even if the front cover 5 is removed from the base 3, the connection portion between the cable and the circuit board 13 is not exposed, and voltage detection can be performed easily and safely.

[0015] In addition, since the alarm device 22 electrically connected to the circuit board 13 is one component of the middle cover 4, the structure is streamlined, making it possible to save space within the main body case 2 and reduce the size of the main body case 2, etc.

[0016] The electrical equipment of the present invention is not limited to the above-described embodiment, and the overall configuration of the electrical equipment as well as the configuration of the middle cover can be appropriately modified as necessary without departing from the spirit of the present invention.

[0017] For example, in the above embodiment, the alarm device, which is an electrical unit, is one of the components of the middle cover, but it is also possible to use a simple cover body as the middle cover without making such an electrical unit one of the components of the middle cover. The positions of the circuit board and the terminals on the base can also be modified as appropriate. However, it is preferable to provide the connection part of the terminal at the end of the terminal on the inlet side, and the voltage detection hole at the end of the terminal opposite the inlet side.

[0018] Furthermore, in the above embodiment, the front cover is formed in the shape of a rectangular box opening to the rear, but the front cover may simply be a plate, and the shape of the front cover as well as the base can be appropriately modified by design. In addition, while the above embodiment describes a leakage current alarm device, which is an example of an electrical device, the present invention can also be suitably adopted for other electrical devices as long as the other electrical devices have a circuit board with terminals mounted on the front side mounted within a main body case having a base and a front cover that is assembled to cover the front of the base. [Explanation of symbols]

[0019] 1··Earth leakage alarm device (electrical equipment), 2··Main body case, 3··Base, 4··Middle cover, 5··Front cover, 11··Inlet, 12··Terminal unit, 12a··Terminal, 13··Circuit board, 14··Voltage detection hole, 17··Connector, 22··Alarm device (electrical unit), 28··Notch.

Claims

1. An electrical device having a circuit board with terminals mounted on a front surface thereof, the circuit board being installed in a main body case having a base and a front cover attached to the front surface of the base, The terminal is provided with a connection portion to which a cable is connected to be led into the main body case, and a voltage detection hole. An electrical device characterized in that a middle cover is attached within the main body case, the middle cover covering the connection portion and exposing the voltage detection hole when the front cover is removed.

2. The electrical device according to claim 1 , wherein the middle cover includes an electrical unit electrically connected to the circuit board.

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