JP5275820B2 - Handle lock structure in circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a handle locking structure in a circuit breaker for surely locking a handle without enlarging the circuit breaker. <P>SOLUTION: A locking hole 20 is formed on a knob section 2a of the handle 2. Further, in a locking member 3 having a base 3a for inhibiting a circuit opening and closing operation of the handle 2 by keeping in contact with an opening 5 edge of a body case 1a and a fitting-in section 3b wherein the knob section 2a is fitted in, notches 7, 8 for exposing the locking hole 20 while the knob section 2a is fitted in are arranged on the fitting-in section 3b. Then, the handle 2 is surely locked as the locking member 3 is mounted and locked to the locking hole 20 exposed in the notches 7, 8. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a handle lock structure for locking a handle for opening and closing a circuit included in, for example, a circuit breaker installed inside a distribution board.

  Conventionally, various structures have been devised as a handle lock structure for locking a circuit opening / closing handle provided in a circuit breaker. For example, in the handle lock structure described in Patent Document 1, the handle is locked by covering the handle with a cap. In the handle lock structure described in Patent Document 2, a plate is provided in the vicinity of the handle, and the operation of the handle is prevented by applying a padlock to the plate.

JP 2002-163969 A JP 2008-186644 A

  However, the handle lock structure described in Patent Document 1 has a problem in that an erroneous operation by a person other than the operator cannot be completely prevented because the lock is released by simply removing the cap. In addition, in the handle lock structure described in Patent Document 2, a plate for locking a padlock must be provided on the case of the circuit breaker. When multiple units are installed side by side in a space, it may happen that the plate gets in the way.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a handle lock structure in a circuit breaker that can securely lock the handle without increasing the size of the circuit breaker.

In order to achieve the above object, the invention according to claim 1 of the present invention is a circuit breaker in which a handle for opening and closing a circuit is provided with a knob projecting from an opening formed in a main body case. A handle lock structure for locking a circuit opening / closing operation of the handle, wherein a through hole is formed in the knob, while the knob can be fitted and the through hole is exposed in the fitted state. A fitting portion provided with a hole exposing portion, and provided integrally with the fitting portion, in contact with the main body case in a state where the knob portion is fitted into the fitting portion, and in a circuit opening / closing operation direction of the handle a locking member made of a base to prohibit the operation of mounting to the handle, while enabling locking the handle by locking the key into the through-hole that is exposed to the hole exposed portion, The locking member is provided with a latching piece that protrudes into the hole exposed portion, and a claw portion that latches on the through-hole in the fitting state of the knob on the inner surface side of the fitting portion. On the other hand, the latching piece is formed thinner than the fitting portion to facilitate removal, and the through-hole can be exposed by removing the latching piece .
The invention according to claim 2 is the invention according to claim 1, wherein the base is in contact with the opening edge and prohibits the operation of the handle in the circuit opening / closing operation direction. The end face contacting the opening is provided with a locking piece that sinks into the main body case from the opening edge in the mounted state.

According to the present invention, while the through hole is formed in the knob portion of the handle, the hole exposed portion that exposes the through hole is provided in the fitting portion of the lock member including the fitting portion and the base, and the lock member is mounted. , The lock member can be removed, that is, the handle using the key can be securely locked by locking the through hole exposed in the hole exposed portion. Therefore, unlike the prior art, there is no need to provide a plate or the like for locking the main body case, and the circuit breaker can be formed in a compact shape without an extra protruding portion.
Further, the locking member is provided with a latching piece that protrudes into the hole exposed portion, and a claw portion that is latched to the through-hole when fitted into the knob is provided on the inner surface side of the fitting portion of the latching piece . Therefore, it is possible to prevent the lock member from being inadvertently dropped simply by inserting the knob into the fitting portion. In addition, because of the easy removal formed to be thinner than the fitting portion hanging piece, if you want to use the key, it is possible to expose the through-holes simply by divided the hanging piece, Convenience is good.
Further, according to the second aspect of the present invention, since the locking piece that enters the inside of the main body case from the opening edge in the mounted state is provided on the end surface that is in contact with the opening of the base, The mounting state of the lock member is maintained, and it is possible to more reliably prevent inadvertent dropping of the lock member.

It is perspective explanatory drawing which showed the external appearance of the lock member attached to a circuit breaker and a handle | steering-wheel. It is a section explanatory view of a circuit breaker and a lock member. It is explanatory drawing which showed the state which attached the lock member to the handle. It is perspective explanatory drawing which showed the state which locked the handle | steering_wheel with the key. It is sectional explanatory drawing of the circuit breaker in the state locked with the key.

  Hereinafter, a handle lock structure in a circuit breaker according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory perspective view showing the external appearance of the lock member 3 attached to the circuit breaker 1 and the handle 2, and FIG. 2 is an explanatory cross-sectional view of the circuit breaker 1 and the lock member 3. FIG. 3 is an explanatory view showing a state in which the lock member 3 is attached to the handle 2. 4 is a perspective explanatory view showing a state in which the handle 2 is locked by the key 4, and FIG. 5 is a cross-sectional explanatory view of the circuit breaker 1 in a state in which the handle 2 is locked by the key 4. 2 and 5 is the front-rear direction of the circuit breaker 1, and the left is the front.
The circuit breaker 1 has a built-in breaking mechanism in a main body case 1a. An opening 5 is provided on the upper surface of the main body case 1a, and a knob 2a of a handle 2 for opening and closing a circuit is provided. It protrudes from the opening 5. The knob 2a is provided with a lock hole (through hole) 20 penetrating from the front surface to the rear surface.

  On the other hand, reference numeral 3 denotes a lock member that is attached so as to cover the handle 2 in the open position or the closed position from above, so that the handle 2 cannot be operated from the position. The lock member 3 is formed by molding a synthetic resin into a cap shape, and includes a base 3a whose plan view is substantially the same shape as the opening 5 and a fitting portion 3b that protrudes upward from the base 3a. And. And the locking piece 6 which sunk under the edge of the opening part 5 and latches to the main body case 1a protrudes in the rear end surface of the base 3a backward. Moreover, the fitting part 3b is formed in the cylinder shape in which the knob | pick part 2a of the handle | steering-wheel 2 can be inserted, and the U-shaped notch (hole exposure part) which opens upwards is formed in the front surface of the fitting part 3b. 7 is provided so that the lock hole 20 is exposed when the lock member 3 is attached to the handle 2. Further, a U-shaped cutout (hole exposed portion) 8 that opens upward is provided on the rear surface of the fitting portion 3b, and a latching piece (hanging portion) protruding upward is provided in the cutout 8. (Stop part) 9 is provided integrally. The latching piece 9 is formed thinner than the rear surface of the fitting portion 3a and can be easily folded with a finger or the like. Further, a claw portion 9 a that is hooked to the lock hole 20 in a state where the lock member 3 is attached to the handle 2 is provided on the front surface of the hook piece 9. When the latching piece 9 is removed, the lock hole 20 is exposed in the notch 8 like the notch 7.

Here, the locking of the handle 2 by the lock member 3 as described above will be described.
When it is desired to temporarily lock the handle 2 in connection with the installation work or inspection work of the circuit breaker 1, the locking piece 6 is opened to the opening 5 with respect to the handle 2 at a predetermined position (open position or closed position). The knob 2 is inserted into the fitting portion 3b until the hooking piece 9 is hooked in the lock hole 20 while being submerged under the edge, and the lock member 3 is attached (FIG. 3). Then, the front end surface and the rear end surface of the lock member 3 come into contact with the front and rear edges of the opening 5, and the handle 2 is locked at a predetermined position, that is, the opening / closing operation of the handle 2 is prohibited. On the other hand, when it is desired to unlock the handle 2, the latch piece 9 may be bent with a finger or the like to release the latch between the latch piece 9 and the lock hole 20, and the lock member 3 may be removed from the handle 2. Note that the lock member 3 in the attached state to the handle 2 is maintained in the attached state by the engagement of the engaging piece 6 and the engaging piece 9, so that it does not fall off carelessly. ing.

  Further, when the handle 2 is to be completely locked when the circuit breaker 1 is installed or inspected, the latch piece 9 of the lock member 3 attached to the handle 2 is broken. The key 4 such as a padlock may be applied using the lock hole 20 exposed in the notches 7 and 8 (FIGS. 4 and 5). Then, it becomes impossible to remove the lock member 3 from the handle 2, and unless the key 4 is removed, the handle 2 is completely locked at the position where the lock member 3 is attached.

As described above, according to the lock structure of the handle 2 in the circuit breaker 1, the lock member 3 is attached to the handle 2, the latch piece 9 is removed from the attached state, and the lock 4 is locked to the lock 4. Thus, the handle lock by the key 4 is possible. That is, the main case 1a can be securely locked using the key 4 without providing a plate or the like for locking the handle 2, and the circuit breaker 1 is formed in a compact shape with no extra protruding portion. be able to.
Further, since the locking member 3 is made of a synthetic resin and the latching piece 9 is formed thin, the latching piece 9 can be removed without using a tool or the like, and the locking operation of the handle 2 is facilitated. It can be carried out.

Furthermore, the handle 2 can be locked only by attaching the lock member 3 to the handle 2, and the handle 2 can be easily locked / unlocked.
In addition, since the locking member 3 is provided with a locking piece 6 that sinks into the edge of the opening 5 when attached to the handle 2 and a locking piece 9 that is locked to the lock hole 20, The state of being attached to the handle 2 can be maintained by the locking and the hooking piece 9 and the lock member 3 can be prevented from being accidentally dropped off.

  The configuration related to the handle lock structure in the circuit breaker of the present invention is not limited to the embodiment described above, and the configuration of the lock member and the like may be changed as appropriate without departing from the spirit of the present invention. Can do.

  For example, although the locking piece 9 is provided on the lock member 3 in the above-described embodiment, the locking piece 9 is not necessarily provided, and only the notch 8 may be provided on the front surface of the fitting portion 3b. Further, in the above embodiment, the locking hole 9 is exposed by folding and removing the latching piece 9, but the latching piece 9 is exposed to the exposure position where the lock hole 20 is exposed and the lock hole 20. It is good also as a structure provided so that it can operate | move to the latching position to latch. For example, the lock hole 20 is exposed by being provided so as to be able to stand upright / side-down, and folded by bending the upper surface side of the base 3a, and after the key 4 is removed, the lock hole 9 can be lifted by raising the latch piece 9 A configuration of returning to the initial state that can be hooked to 20 is conceivable. Furthermore, the design of the presence or absence of the locking piece 6 can be changed as appropriate, and the front and rear end surfaces of the lock member 3 are not in contact with the edge of the opening 5 to inhibit the opening / closing operation of the handle 2, but other than the body case 1a. There is no problem even if it is configured so that the opening / closing operation of the handle 2 is prohibited by engaging with this portion.

  1 ... Circuit breaker 2 ... Handle 3 ... Lock member 3a ... Base 3b ... Fitting part 4 ... Key 5 ... Opening part 6 ... Locking piece 7 8, notches, 9 ... retaining pieces, 9a ... claw, 20 ... lock holes.

Claims (2)

In the circuit breaker provided with a handle for opening and closing the circuit protruding from the opening opened in the main body case, the handle lock structure for locking the circuit opening and closing operation of the handle,
While forming a through hole in the knob,
The fitting portion can be fitted and provided with a fitting portion provided with a hole exposing portion that exposes the through hole in the fitted state, and the fitting portion is provided integrally with the knob. The through hole that is in contact with the main body case in the inserted state and has a lock member including a base that prohibits the handle from being operated in a circuit opening / closing operation direction and is exposed to the hole exposing portion. thereby enabling locking the handle by locking the key,
The locking member is provided with a latching piece that protrudes into the hole exposed portion, and a claw portion that latches on the through-hole in the fitting state of the knob on the inner surface side of the fitting portion. The handle in a circuit breaker is characterized in that the latching piece is formed thinner than the fitting portion for easy removal, and the through-hole can be exposed by removing the latching piece. Lock structure. The base is in contact with the opening edge to prohibit the operation of the handle in the circuit opening / closing operation direction, and the end surface of the base in contact with the opening is attached to the inside of the main body case from the opening edge in the mounted state. The handle lock structure for a circuit breaker according to claim 1 , further comprising a locking piece that sinks into the circuit breaker.

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