JP4774326B2 - Circuit breaker handle lock device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a circuit breaker handle lock device for locking an operation handle for turning on / off a breaker output, and in particular, a trip button for testing an overcurrent trip device and a test button for testing a leakage detection circuit. The present invention relates to a handle lock device for a circuit breaker provided.

  Some circuit breakers include a trip button for testing whether an overcurrent tripping device incorporated therein operates normally (see, for example, Patent Document 1). Moreover, the circuit breaker provided with the earth leakage breaker mechanism is provided with a test button for testing whether the earth leakage detection circuit operates normally (see, for example, Patent Document 2).

On the other hand, when the operation handle of the circuit breaker is connected to a load that needs to be kept on at all times, such as an emergency light, or when a load that can only be turned on under certain conditions is connected Some devices are configured so that they can be locked in an on state or an off state by a lock device so that they are not accidentally turned off or turned on. For example, Patent Document 3 has a structure in which a cap that covers an operation handle is attached and locked.
In addition, circuit breakers tend to be miniaturized, and the operation handle is also tilted so that the operation handle is parallel to the upper surface of the breaker case when the output is turned on by turning the operation handle. Some have a flat type operation handle that eliminates the part protruding from the upper surface of the case. As a locking device for locking such a flat type operation handle, there is a structure described in Patent Document 4. In this case, a fitting groove is provided in a portion of the upper surface of the circuit breaker case in the rotational direction of the operation handle, and a lock member is fitted in the groove to lock the operation handle.

JP 2002-93299 A JP 2002-75164 A JP 2000-11842 A JP 2001-307777 A

However, any of the locking devices disclosed in Patent Documents 3 and 4 can lock the operation handle, but when applied to a configuration in which a trip button or a test button is provided, the locking device is locked in an output-on state. Even if the trip button or test button is operated, the output is turned off due to the shut-off operation. Then, the meaning of wearing the lock device will disappear.
In view of the above problems, the present invention has an object to provide a circuit breaker in which a trip button and a test button cannot be operated when an operation handle is locked in an output-on state.

In order to solve the above-mentioned problems, the invention of claim 1 is directed to a circuit breaker having a trip button for performing a test operation of an overcurrent tripping device that operates to be interrupted when an overcurrent occurs. A pair of fitting recesses formed on both the front and rear surfaces of the operation handle provided on the upper surface of the circuit breaker case, and the operation handle inserted into the fitting recess. And forming one of the first fitting recesses at a portion exposed at the operation handle off position, and forming the other second fitting recess at a portion exposed at the operation handle on position, When the trip button is arranged on the upper surface of the circuit breaker case in the vicinity of the second fitting recess, when the lock member is inserted into the second fitting recess and the ON state is locked, Serial locking member is characterized by covering the trip button.
With this configuration, the operation handle can be locked by inserting the lock member into the operation handle when the output is turned on. Since the trip button is hidden when locked, there is no possibility that the trip button is operated, and there is no possibility that the off operation is performed although the operation handle off operation is prohibited.

According to a second aspect of the present invention, there is provided a circuit breaker including a leakage detection circuit and having a test button for testing an operation of the leakage detection circuit, wherein the operation handle is fixed at an on or off position. A pair of fitting recesses formed on both the front and rear surfaces of the operation handle provided on the upper surface of the circuit breaker case, and a lock member inserted into the fitting recess to lock the operation handle. One of the first fitting recesses is formed in a portion exposed at the operation handle off position, and the other second fitting recess is formed in a portion exposed at the operation handle on position, and the test button is fitted in the second fitting The lock member is arranged on the upper surface of the circuit breaker case in the vicinity of the recess, and when the lock member is inserted into the second fitting recess to lock the ON state, the lock member locks the test button. And wherein the Ukoto.
With this configuration, the operation handle can be locked by inserting the lock member into the operation handle when the output is turned on. Since the test button is hidden when it is locked, there is no possibility that the test button is operated, and there is no possibility that the operation button is turned off even though the operation handle-off operation is prohibited.

The invention of claim 3 is characterized in that in the invention of claim 1 or 2, a locking means for locking the insertion piece inserted into the fitting recess of the lock member is provided in the fitting recess. To do.
With this configuration, since the lock member inserted into the fitting recess is locked, the mounted lock member is not detached, and no separate retaining means is required.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the fitting recess is a fitting groove formed by cutting out a side surface of the operation handle.
With this configuration, since only the side surface of the operation handle is cut away, the fitting recess and the locking means can be easily manufactured.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the both fitting recesses are arranged in parallel to the upper surface of the circuit breaker case when exposed, and the lock member is disposed on the upper surface of the circuit breaker case. It is inserted into the fitting recess by sliding operation.
With this configuration, the lock member can be inserted and locked in the operation handle by sliding the lock member parallel to the upper surface of the circuit breaker case. Therefore, when the operation handle of the circuit breaker is turned on, the lock member is tilted substantially parallel to the upper surface of the circuit breaker. Even with this configuration, it is possible to prevent the mounted lock member from protruding from the operation handle, and it is not necessary to design the dimensions of the distribution board in consideration of the mounting of the lock member. Further, since the protruding portion can be eliminated, the circuit breaker is suitable for downsizing.

  According to the present invention, when the operation handle is locked when the circuit breaker output is turned on, the trip button or the test button is hidden, so there is no possibility that the trip button or the test button is operated, and the operation handle off operation is prohibited. Therefore, there is no such thing as an off operation.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. 1 to 4 show an example of a handle lock device for a circuit breaker according to the present invention, and show a perspective view of the circuit breaker. 1 shows a state before the lock member is inserted in the output off state, FIG. 2 shows a state in which the lock is locked in the output off state, FIG. 3 shows a state before the lock member is inserted in the output on state, and FIG. ing. In addition, only the circuit breaker seen from the back direction is shown in FIG.
In each figure, 1 is a circuit breaker case in which an overcurrent tripping device for a circuit breaker is incorporated, 2 is a power supply side terminal provided on the back of the circuit breaker case, 3 is a load side terminal provided on the front of the case, 4 is An operation handle 5 for turning on / off the circuit breaker output is a lock member that locks the operation handle 4 to disable the operation.

This circuit breaker is formed so as to correspond to a single-phase three-wire electric circuit, and both the power supply side terminal 2 and the load side terminal 3 are configured by vertically arranging three terminals. The power supply side terminal 2 is formed by a plug-in type, and the load side terminal 3 is formed by a fast connection terminal, and both are configured to be connected by simply inserting them. The power supply side terminal 2 is arranged with the neutral terminal at the upper part and the lower two terminals as the voltage terminal, and the load side terminal 3 is arranged with the neutral terminal at the center and the upper and lower terminals as voltage terminals. With this arrangement, a 100V voltage output can be obtained by connecting an electric wire to the central terminal port 3b of the load side terminal 3 and one of the upper terminal port 3a or the lower terminal port 3c. By connecting electric wires to 3a and 3c, an output of 200V voltage can be obtained.
Further, the operation handle 4 is in a state of protruding upward from the circuit breaker case 1 in the off operation state, and is tilted to an angle substantially parallel to the upper surface of the circuit breaker case 1 in the on operation state.

On the other hand, on the upper surface of the circuit breaker case 1 provided with the operation handle 4, the protective wall 7 disposed in parallel with the operation direction of the operation handle 4 adjacent to the left and right of the operation handle 4 and the overcurrent tripping device are subjected to a test operation. A trip button 8 is provided.
The protective wall 7 is formed so as to accommodate and protect the operation handle 4 that has been turned on, and is formed at substantially the same height as the operation handle 4 in the on state. The protective wall 7 is also used as a guide wall that guides the sliding operation of the lock member 5.
Further, the trip button 8 is arranged at a close position on the front side of the operation handle 4 and is urged upward by a coil spring (not shown), and is arranged with its upper end exposed in the operation window provided on the upper surface of the circuit breaker case 1. It can be turned on by an insertion operation by a driver or the like.

In the circuit breaker configured as described above, the handle lock device is configured as follows. A first fitting recess 9 a for locking the output off state is provided on the back surface of the operation handle 4. The first fitting recess 9a is formed to be exposed on the upper surface of the circuit breaker case 1 in the off state and to be parallel to the upper surface of the circuit breaker case 1 in the exposed state.
5A is a longitudinal sectional view of the circuit breaker in which the vicinity of the operation handle 4 in the locked state in FIG. 2 is enlarged, and the first fitting recess 9a is formed in a groove shape by cutting out the side surface of the operation handle 4. FIG. A locking recess (locking means) 10 for locking the lock member 5 is provided on the inner bottom surface.

Further, a second fitting recess 9b for locking the ON state is formed in the front surface of the operation handle 4. The second fitting recess 9b is formed to be exposed on the upper surface of the circuit breaker case 1 in the on state and to be parallel to the upper surface of the circuit breaker case 1 in the exposed state.
FIG. 5B shows a longitudinal sectional view of the circuit breaker in which the vicinity of the operation handle 4 in the locked state shown in FIG. 4 is enlarged, and the second fitting recess 9b is formed by cutting the side surface of the operation handle 4 into a groove shape. A locking recess 10 for locking the lock member 5 is provided on the inner upper surface. The grooves constituting the first fitting recess 9 a and the second fitting recess 9 b are formed on the same side surface of the operation handle 4.

  On the other hand, the lock member 5 is formed by a rectangular plate-shaped knob portion 12 and an insertion piece 13 to be inserted into the fitting concave portions 9a and 9b protruding from the end portion. The knob 12 is formed in accordance with the interval between the protective walls 7 formed on the left and right sides, and the insertion piece 13 is formed in substantially the same shape as the fitting recesses 9 a and 9 b and is engaged with the locking recess 10. A stop projection 5a is provided.

By forming the handle lock device in this way, the lock operation when the output is off is performed by inserting the lock member 5 into the first fitting recess 9a exposed on the back surface of the operation handle 4 as shown in FIG. The lock member 5 is disposed in the space surrounded by the protective walls 7 and 7 and is slid to insert and insert the insertion piece 13 into the first fitting recess 9a. By this fitting operation, the locking projection 5a is locked to the locking recess 10.
Further, as shown in FIG. 3, the lock operation when the output is turned on is performed by inserting the lock member 5 into the second fitting recess 9 b exposed from the front to the front surface of the operation handle 4. The lock member 5 is disposed in front of the space surrounded by 7 and is slid to insert and insert the insertion piece 13 into the second fitting recess 9b. By this fitting operation, the locking projection 5a is locked to the locking recess 10. At the same time, the upper part of the trip button 8 is closed by the lock member.

In this way, when the operation handle is locked when the circuit breaker output is turned on, the trip button is hidden, so there is no possibility of the trip button being operated, and the operation handle is turned off even though the operation handle off operation is prohibited. There is nothing.
In addition, since the lock member inserted into the fitting recess is locked, the mounted lock member will not come off, no separate locking means is required, and the fitting handle is formed by cutting out the side of the operation handle. Therefore, the fitting recess can be easily produced.
Furthermore, since the lock operation is performed by a slide operation in a direction parallel to the upper surface of the circuit breaker case, even when the operation handle of the circuit breaker is turned on, the circuit breaker is mounted even if it is tilted substantially parallel to the upper surface The lock member can be prevented from protruding from the operation handle, and it is not necessary to design the dimensions of the distribution board in consideration of the mounting of the lock member. Further, since the protruding portion can be eliminated, the circuit breaker is suitable for downsizing.

In the above embodiment, the circuit breaker having the trip button 8 has been described. However, the present application configuration is also applied to a circuit breaker having a leakage breaker function and having a test button for testing the leakage detection circuit. can do. If a test button is provided instead of the trip button 8 described above, the test button can be hidden by the lock member in the handle lock operation, there is no possibility that the test button is operated at the time of lock, and the operation handle off operation is prohibited. Regardless, there is no such thing as an off operation.
It can also be applied to a circuit breaker having both a trip button and a test button, and the trip button and the test button are arranged close to each other, and the knob 12 of the lock member 5 is covered with both buttons. It should be a possible size.
Furthermore, although the fitting recesses 9a and 9b are respectively provided on one side of the operation handle 4, grooves 13 are provided on the left and right side surfaces of the operation handle 4, and the insertion piece 13 of the lock member 5 is configured so as to sandwich the operation handle 4. You may do it.
Moreover, although the structure which the operation handle 4 is arrange | positioned in parallel with the circuit breaker case 1 upper surface at the time of ON operation is shown, the circuit breaker of the form by which an operation handle is rotationally operated by the back-and-forth symmetrical angle in ON / OFF operation However, the handle lock device can be applied well.

It is a perspective view of the circuit breaker concerning the present invention, and shows the state before an operation handle lock in an OFF operation state. It is a perspective view which shows the state after the operation handle lock of FIG. FIG. 2 is a perspective view showing the circuit breaker of FIG. 1 turned on and before the operation handle is locked. It is a perspective view which shows the state after the operation handle lock of FIG. The longitudinal cross-sectional view of the circuit breaker which expanded the operation handle vicinity is shown, (a) is the state of FIG. 2, (b) is the state of FIG.

Explanation of symbols

  1 ... Circuit breaker case 4 ... Operation handle 5 ... Lock member 7 ... Protection wall (guide wall) 8 ... Trip button 9a, 9b ... Fitting recess 10 ... Locking recess (Locking means), 12 .. pick part, 13 .. insert piece.

Claims (5)

In a circuit breaker having a trip button for performing a test operation of an overcurrent tripping device that performs a cutoff operation when an overcurrent occurs, a handle lock device that fixes an operation handle in an on or off position,
A pair of fitting recesses formed on both front and rear surfaces of the operation handle provided on the upper surface of the circuit breaker case, and a lock member that is inserted into the fitting recess and locks the operation handle.
One of the first fitting recesses is formed in a portion exposed at the operation handle off position, and the other second fitting recess is formed in a portion exposed at the operation handle on position, and the trip button is formed in the second fitting. It is arranged on the upper surface of the circuit breaker case near the recess,
The circuit breaker handle lock device, wherein the lock member covers the trip button when the lock member is inserted into the second fitting recess to lock the ON state. In a circuit breaker comprising a leakage detection circuit and having a test button for testing the operation of the leakage detection circuit, a handle lock device for fixing the operation handle in an on or off position,
A pair of fitting recesses formed on both front and rear surfaces of the operation handle provided on the upper surface of the circuit breaker case, and a lock member that is inserted into the fitting recess and locks the operation handle.
One of the first fitting recesses is formed in a portion exposed at the operation handle off position, and the other second fitting recess is formed in a portion exposed at the operation handle on position, and the test button is fitted in the second fitting Arranged on the upper surface of the breaker case near the recess,
The circuit breaker handle lock device, wherein the lock member covers the test button when the lock member is inserted into the second fitting recess to lock the ON state. The handle lock device for a circuit breaker according to claim 1 or 2, further comprising locking means for locking an insertion piece inserted into the fitting recess of the lock member in the fitting recess. 4. The circuit breaker handle lock device according to claim 1, wherein the fitting recess is a fitting groove formed by cutting out a side surface of the operation handle. The both fitting recesses are arranged parallel to the upper surface of the circuit breaker case when exposed, and the lock member is inserted into the fitting recess by sliding operation on the upper surface of the circuit breaker case. A handle lock device for a circuit breaker according to claim 1.

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