JP2002093300A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure safety of attachment/detachment works of an attachment in a circuit breaker attaching/detaching the attachment by opening an attachment cover provided in a cover. SOLUTION: The attachment cover 4 is provided in a power supply side of an operation handle 3 projecting from the cover 2 and a fastening screw 6 of the attachment cover 4 is provided in a position concealed by the operation handle 3 in the turned-on position. When the circuit breaker is turned on, even if the fastening screw 6 is loosened by a screwdriver, the attachment cover 4 is prevented from being opened and the operation handle 3 must be tipped or turned off to open the attachment cover 4. This constitution can avoid the risk of attaching/detaching the attachment with the circuit breaker turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker such as a circuit breaker for a wiring or an earth leakage breaker, and more particularly to a circuit breaker to which an attached device is detachably mounted.

[0002]

5 to 7 show a conventional circuit breaker. FIG. 5 is a perspective view of an ON state of the circuit breaker, FIG. 6 is a side view of the circuit breaker of FIG. 5, and FIG. FIG. 6 is a side view of the circuit breaker of FIG. 5 with an attached cover opened. In FIG.
The circuit breaker includes an insulating molded case including a case 1 and a cover 2, and an operation handle 3 that rotates between three positions of ON, OFF, and TRIP is protruded from the cover 2. The cover 2 is provided on both sides of the operation handle 3 with an accessory cover 4 for detachably attaching an accessory device such as an auxiliary switch or an alarm switch in the mold case. The attached cover 4 is connected to the cover 2 via a protruding shaft 5 at one end, and is fixed in a closed state in the figure by a tightening screw 6. Reference numeral 7 denotes a trip button for forcibly tripping the circuit breaker. The trip button 7 is provided so as to look forward from the attached cover 4 on the right side.

In the circuit breaker shown in FIG. 5, when attaching and detaching an attached device, the screw 8 is loosened with a screwdriver 8 (FIG. 6) to open the attached cover, but as shown in FIG. The driver 8 can access the handle 3 even when the handle 3 is in the ON position shown in the figure. Therefore, conventionally, as shown in FIG. 7, after the circuit breaker is turned on, the fastening screw 6 is loosened to open the attached cover 4, then the trip button 7 is pushed to trip the circuit breaker, and the attached device 9 is attached and detached. Was. The cover 2 is provided with a recess 2a for accommodating the accessory device 9, and the accessory device 9 is fitted into the recess 9a as shown by an arrow. The attachment / detachment of the attachment device 9 is basically performed by tripping or turning off the circuit breaker, and attachment / detachment in the ON state is dangerous. In FIG. 7, the broken line position of the operation handle 3 is the off position.

[0004]

In the above-mentioned conventional circuit breaker, since the accessory cover 4 can be opened even when the circuit breaker is on, the attachment device 9 is inadvertently attached and detached while the circuit breaker remains on. This could be a safety issue. Therefore, an object of the present invention is to ensure the safety of the attachment / detachment work of the attachment device.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a mold case comprising a case and a cover, and an operation handle which rotates between three positions of on, off and trip is provided on the cover. Projecting from
The cover is provided with an accessory cover for detachably mounting the accessory device in the mold case, and the accessory cover is provided in the circuit breaker fixed in a closed state by a tightening screw. The tightening screw is provided at a position hidden by the operation handle, and the screw cannot be removed by a driver unless the operation handle is at an off position or a trip position.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a perspective view of the circuit breaker in an ON state, FIG. 2 is a side view of the circuit breaker of FIG. 1, FIG. 3 is a side view of a trip state of the circuit breaker of FIG. 1, and FIG. FIG. 4 is a side view of the circuit breaker of FIG. Note that the same reference numerals are used for the portions corresponding to the conventional example. The circuit breaker shown in FIG. 1 is different from the conventional circuit breaker in that the attached cover 4 is formed to be horizontally long so as to cover the width of the cover 2 and is provided above the operation handle 3, that is, on the power supply side (the right end side in FIG. 1). It is a point that has been. Thus, the attached cover 4 is connected to the cover 2 via the protruding shaft 5 at one end, and the tightening screw 6 at the other end is hidden from the front surface (the upper surface in FIG. 1) of the cover 2 by the operation handle 3 at the ON position shown in the figure. It is provided in the position where it was.

Therefore, as shown in FIG. 2, when the circuit breaker is on, the driver 8 is blocked by the operating handle 3 and cannot access the tightening screw 6, and is accessed only in the trip state or the off state shown in FIG. Will be possible. In order to open the attached cover 4, the trip button 7 is pressed before the circuit breaker is tripped or the operation handle 3 is opened.
Is turned to the off position to turn off the circuit breaker. Fig. 4 trips the circuit breaker, opens the attached cover 4,
The situation where the attachment device 9 is attached and detached is shown.

[0008]

As described above, according to the present invention, unless the circuit breaker is tripped or turned off, the tightening screw of the attached cover cannot be loosened. The danger of attaching / detaching the attached device is prevented beforehand, and the safety of attaching / detaching the attached device is ensured.

[Brief description of the drawings]

FIG. 1 is a perspective view of an ON state of a circuit breaker according to an embodiment of the present invention.

FIG. 2 is a side view of the circuit breaker of FIG.

FIG. 3 is a side view of the circuit breaker of FIG. 1 in a trip state.

FIG. 4 is a side view of the circuit breaker of FIG. 1 with an attached cover opened.

FIG. 5 is a perspective view of a conventional circuit breaker in an ON state.

FIG. 6 is a side view of the circuit breaker of FIG.

FIG. 7 is a side view of the circuit breaker of FIG. 5 with an attached cover opened.

[Description of Signs] 1 Case 2 Cover 3 Operation handle 4 Attached cover 5 Protruding shaft 6 Tightening screw 7 Trip button 8 Driver 9 Attached device

Continuing from the front page (72) Inventor Kiyoshi Hasegawa 1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Yoshiaki Kawashima 1-1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Inside Electric Co., Ltd. (72) Inventor Makoto Ogasawara 1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture F-term inside Fuji Electric Co., Ltd. 5G030 BA05 XX04

Claims (1)

[Claims] The present invention further comprises a mold case comprising a cover and a case, and an operation handle pivoting between three positions of on, off and trip protrudes from the cover, and the cover has an accessory device in the mold case. An attached cover for detachably attaching the is provided to be openable and closable,
In the circuit breaker, the accessory cover is fixed in a closed state by a tightening screw. The tightening screw is provided at a position hidden by the operating handle in an on position, and the tightening screw is provided when the operating handle is in an off position or a trip position. A circuit breaker characterized in that it cannot be removed by a driver unless it is located in a circuit breaker.