JP4830595B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker for wiring breakers, earth leakage breakers, and the like, and more particularly to a storage structure for an internal accessory device formed on a cover of a main body case.

  For the circuit breakers and earth leakage circuit breakers listed above, auxiliary switches, alarm switches, and external signals that electrically display the circuit breaker ON, OFF, and TRIP operations as accessory devices that are selectively used by the user A voltage trip device that trips the circuit breaker, an undervoltage trip device, etc. are available as retrofitting options. Correspondingly, the various internal accessory devices described above are attached to the cover of the circuit breaker body case. In order to be mounted, a storage part (recess) with an auxiliary cover is provided (see, for example, Patent Document 1 and Patent Document 2).

  Next, FIG. 4 shows the basic structure of a circuit breaker for wiring as an example, and FIG. 5 shows the case outline of a circuit breaker provided with a housing for an internal accessory device in the main body case. First, in FIG. 5, 1 is a main body case, 2 is a stationary contact, 3 is a movable contact, 4 is a movable contact holder, 5 is a toggle link type contact opening / closing mechanism linked to the holder 4, 6 is an operation handle, 7 is a latch receiver, 8 is a trip cross bar, and an operation handle 6 is pivotally supported by a frame 5a of an opening / closing mechanism via a handle lever 6a. The operation of the circuit breaker having the above-described configuration is well known. When the operation handle 6 is tilted from the ON position to the OFF position in the illustrated contact closing state, the toggle link mechanism of the opening / closing mechanism 5 is reversed to move the movable contact 3. Open the pole. When the latch 5c of the opening / closing mechanism 5 is released in response to an output signal of an overcurrent detection device (not shown), the toggle link mechanism is reversed by the spring force of the opening / closing spring 5b that has been stored up to now. As the movable contact 3 opens, the operation handle 6 moves to the TRIP position between the ON position and the OFF position and stops in conjunction with the opening operation. In this trip operation state, the open / close spring 5b releases the spring force and becomes free. In order to re-insert the circuit breaker after the trip operation, the operation handle 6 is moved to the OFF position at one end to reset the latch, and then moved to the ON position. Although not shown, the circuit breaker is equipped with a trip button as a standard feature, and the circuit breaker is tripped by manually pressing the trip button.

    As shown in FIG. 6, the circuit breaker main body case 1 (molded resin case) includes a case 1a, a cover 1b, and an auxiliary cover 1c. A pocket-shaped recess 1d is formed as a storage portion of the internal accessory device described above on both sides. Various types of internal accessory devices 9 such as auxiliary switches, alarm switches, voltage trip devices, undervoltage trip devices, etc. are inserted into cassettes at specified positions in the recesses 1d and mounted. . The auxiliary cover 1c is a cover for covering the opening surface of the recess 1d in the closed position, and one end of the auxiliary cover 1c is hinged to the cover 1b.

On the other hand, when the internal accessory device is retrofitted to the circuit breaker, mounting the internal accessory device 9 in the recess 1d of the cover 1b when the circuit breaker is in an ON state (energized state) may result in a charging part There is a danger of electric shock from touching your fingers. Even when the circuit breaker is in the OFF state, if the latch of the opening / closing mechanism (the opening / closing spring is in the energized state) is released and the tripping operation is unexpectedly performed during the operation of attaching / detaching the internal accessory device 9, the opening / closing mechanism is caused to reverse. The actuator of the internal accessory device may be broken by an impact, or the operator's fingers may be caught in the toggle link mechanism, resulting in injury. In particular, since the undervoltage trip device cannot keep the circuit breaker in the reset state when there is no voltage, it is dangerous because the switching mechanism trips simultaneously with the undervoltage trip device even when the circuit breaker is OFF. . On the other hand, if the circuit breaker is in a tripped state, it is in a free state in which the open / close spring of the open / close mechanism is not energized due to de-energization, so various internal accessory devices including an undervoltage trip device Therefore, in the circuit breaker disclosed in the above-mentioned Patent Document 2, as a safety measure when attaching / detaching the internal accessory device, a mechanism interlocked with the latch of the opening / closing mechanism shown in FIG. The auxiliary cover 1c of the main body case 1 is locked in the closed position with a pawl, the opening of the auxiliary cover is prevented when the circuit breaker is in the ON / OFF state, and the auxiliary cover can be opened only in the trip operation state. It is possible to safely attach and remove internal accessory devices.
Japanese Patent No. 3097368 Japanese Patent Laid-Open No. 2000-3656

  By the way, as a safety measure for attaching and detaching the internal accessory device, the method disclosed in Patent Document 2 has the following problems in handling work. In other words, users who are not familiar with the manual on how to install the internal accessory can not open the auxiliary cover even when the circuit breaker is opened by manually turning the operation handle OFF, so the case structure is incomplete. There is a risk of misunderstanding that there is. Also, if the operator tries to install the internal accessory without confirming that the operation handle is in the trip position when the auxiliary cover is open, such as when installing or inspecting the circuit breaker, In this way, there is a risk that the fingers may be pinched and injured by an unexpected trip operation of the opening / closing mechanism. In addition, even when the internal accessory is removed from the storage unit with the auxiliary cover open, if the operation handle is stopped at the ON or OFF position as described above, there is a danger. .

  The present invention has been made in view of the above points. Even when the auxiliary cover of the main body case is open, the circuit breaker is prevented from being attached when the circuit breaker is ON or OFF, and the circuit breaker is tripped. It is an object of the present invention to provide a circuit breaker capable of ensuring the safety of work performed by a user by enabling insertion / removal of an internal accessory device only when it is in a state in which it has been performed.

In order to achieve the above object, according to the present invention, an opening / closing mechanism is housed in a body case made up of a case and a cover, and the cover is formed with a recess for housing an internal accessory device on the side of the operation handle. In the circuit breaker,
When the circuit breaker is on or off, the internal accessory is prevented from being attached, and it moves to the on, off, or trip position linked to the operation handle as an interlocking mechanism that allows the internal accessory to be attached or detached only in the trip state. An interference member that protrudes into the recess and is provided on the side of the handle lever of the operation handle and protrudes into the recess of the cover , corresponding to the on / off position of the interference lever. An interference protrusion is provided on the bottom side of the external case of the internal accessory device .
In addition, the interference lever may be provided on the side of the handle lever of the operation handle so as to straddle the lower edge of the partition partitioning the recess of the cover and the operation handle .

  According to the above configuration, when the user attaches the internal accessory device, when the operation handle is stopped in the on or off position except when the circuit breaker is in a tripping state, the main body case The interference projection of the internal accessory device to be inserted into the cover recess of the cover abuts on the top of the interference lever protruding into the recess and cannot be pushed into a predetermined mounting position. On the other hand, when the circuit breaker is tripped artificially, the interference lever moves to the trip position in conjunction with the operation handle, so the internal accessory device is pushed into the predetermined position without receiving interference from the interference lever. Can be installed. In addition, when the circuit breaker is tripped, the main circuit contact is opened and the open / close spring of the open / close mechanism is also free so that the internal accessory device can be mounted safely.

  As a result, the user can safely attach and detach the internal accessory device, and the handling and reliability of the circuit breaker are improved.

Embodiments of the present invention will be described below based on the examples shown in FIGS. In the drawings of the embodiment, members corresponding to those in FIGS. 5 and 6 are denoted by the same reference numerals and description thereof is omitted.
That is, in the circuit breaker of the illustrated embodiment, the outer surface of the tip near the pivot point O with respect to the inverted U-shaped handle lever 6a coupled to the operation handle 6 as shown in FIGS. 1 (a) to 1 (c). Is additionally provided with an interference lever 6b protruding toward the inside of the recess 1d formed in the cover 1b of the main body case 1. The interference lever 6b is a U-shaped resin molded part as shown in the figure, and its mounting base is fixed to the outer surface of the handle lever 6a to be interlocked with the operation handle 6, and the interference lever 6b is U-shaped. Is sandwiched and held between the partition wall 1b-1 and straddles the partition wall 1b-1 between the recess 1d (the recess adjacent to the operation handle 6) formed on the cover 1b with the leading end of the lever from the lower side. It is installed so as to protrude inward of the recess 1d. FIG. 4 is an external view of the main body case 1 in a state where the operation handle 6 is tilted to the OFF position and the auxiliary cover 1c is opened, and the inside of the recess 1d adjacent to the side of the operation handle 6 The interference lever 6b thus protruded. In the illustrated example, the interference lever 6b is provided only on one leg of the handle lever 6a having a U-shape, but may be provided on both leg pieces. Further, the interference lever 6b may be formed integrally with the same member as the handle lever 6a.

  On the other hand, the internal accessory device (undervoltage trip device in the illustrated example) 9 to be mounted in the recess 1d has a pair of left and right protruding sideways from the bottom of the exterior case (resin case) facing the interference lever 6b. The interference protrusion 9a is formed. In FIG. 1 (c), 9b is a snap fit for locking the internal accessory device 9 in the recess 1d, and 9c is an operation lever for tripping the circuit breaker by the operation of the undervoltage trip device.

  With the above configuration, when the operation handle 6 is tilted to the OFF position in FIG. 2A, the interference lever 6b moves to the illustrated position I in conjunction with the operation handle. Further, when the operation handle 6 is tilted to the ON position, the interference lever 6b moves from the position I to the position II in FIG. 2B, and in the tripping state of the circuit breaker, the interference lever 6b is moved to the position shown in FIG. As shown, it stops at an intermediate position III between the positions I and II.

  Then, in the OFF and ON states shown in FIGS. 2 (a) and 2 (b), when the internal accessory device 9 is to be mounted in the recess 1d formed in the cover 1b of the main body case, as shown in FIG. 3 (a). The interference protrusion 9a provided on the exterior case of the internal accessory device 9 abuts against the top of the interference lever 6b protruding into the recess 1d and is prevented from being mounted. On the other hand, in a state where the circuit breaker is tripped by artificially pressing the trip button or the like, the trip lever 6b moves to the TRIP position III in FIG. The internal accessory device 9 can be pushed into the recess 1d and mounted at a predetermined position without interference with 6b. When the operation handle 6 is operated from the TRIP position to the OFF → ON position after resetting the circuit breaker after the internal accessory device 9 is mounted in the recess 1d, the interference lever 6b is shown in FIGS. 2 (a) and 2 (b). Therefore, even if it is attempted to remove the internal accessory device 9 from the recess 1d in this state, the interference protrusion 9a cannot interfere with the interference lever 6b and be extracted.

  Therefore, when attaching / detaching the internal accessory device 9, the internal accessory device 9 cannot be attached / detached in the ON or OFF state unless the circuit breaker is manually tripped. As a result, unexpected troubles such as finger injury and actuator breakage of the internal accessory device can be prevented, and the internal accessory device can be safely attached and detached while the circuit breaker is tripped.

BRIEF DESCRIPTION OF THE DRAWINGS It is a principal part structure figure of the circuit breaker by the Example of this invention, (a) is cover sectional drawing of the main body case centering on the operation handle, (b) is a perspective view of the operation handle lever in (a), (c) ) Is an external perspective view of an internal accessory device (undervoltage trip device) installed in a recess formed in the cover. 1 is a diagram showing the stop position of the interference lever that is displaced corresponding to the operation of the circuit breaker, with (a), (b), and (c) corresponding to OFF, ON, and TRIP, respectively. FIGS. 2A and 2C are diagrams showing the correlation between the interference protrusions provided on the internal accessory device of FIG. 1C and the interference levers of FIGS. 2A to 2C, and FIG. State diagram External view of the auxiliary cover opened with the circuit breaker corresponding to FIG. Cross-sectional view of a circuit breaker exemplifying a circuit breaker for wiring External view showing the state where the internal accessory is attached to the main body case of the circuit breaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit breaker main body case 1a Case 1b Cover 1c Auxiliary cover 1d Recess (accommodation part of internal accessory device)
6 Operation handle 6a Handle lever 6b Interference lever 9 Internal accessory device (undervoltage trip device)
9a Interference protrusion

Claims (2)

In the circuit breaker in which the opening / closing mechanism is housed in the body case composed of the case and the cover, and the cover is formed with a recess for housing the internal accessory device on the side of the operation handle.
When the circuit breaker is on or off, the internal accessory is prevented from being attached, and it moves to the on, off, or trip position linked to the operation handle as an interlocking mechanism that allows the internal accessory to be attached or detached only in the trip state. An interference member that protrudes into the recess and is provided on the side of the handle lever of the operation handle and protrudes into the recess of the cover , corresponding to the on / off position of the interference lever. A circuit breaker characterized in that an interference projection is provided on the bottom side of the exterior case of the internal accessory device. The circuit breaker according to claim 1 , wherein the interference lever protrudes on the side of the handle lever of the operation handle across the lower edge of the partition partitioning the recess of the cover and the operation handle. Feature circuit breaker.

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