JPS62271320A - Circuit breaker handle locking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention provides a circuit breaker, particularly a circuit breaker for a distribution panel with a single-pole or multi-pole configuration, in which the operation of an operating handle is controlled. Relates to improvements in handle locking devices used for locking.

[Conventional technology]

Conventional handle locking devices are generally shown in Fig. 9, Fig. 1.
As shown in FIG. 0, the operating handle 3 has a lock cover 17 made of a rectangular cylindrical cap portion 19 having an inclined hole 18 and a support plate 20 connected thereto, which protrudes from the circuit breaker case 1.
The operating handle 3 is mounted in the direction indicated by the arrow in FIG. 9, and by changing the mounting direction, the operating handle 3 is restrained in the open or closed position. FIG. 11 shows a state in which the lock cover 17 is locked using the lock 21. As shown in FIG.

Another example of a conventional handle lock device is the
As described in No. 4-53667, an inclined hole applied to the operation handle of a single-pole circuit breaker and a fitting groove with an open end applied to the interlocking operation handle of a multi-pole circuit breaker are integrated into the lock cover. As described in Japanese Utility Model Application Publication No. 59-98557, the cap portion of the lock cover is formed of both side plates that sandwich the operating handle from the side and a connecting plate that connects one end of each side plate. In some cases, hooks provided on both side plates of the cap part are engaged with the corners of the handle, and protrusions provided on the connecting plates of the cap part are fitted into recesses on the sides of the handle.

[Problem that the invention seeks to solve]

The conventional examples shown in FIGS. 9 and 10 have the following problems.

(1) Normally, the lock cover 17 is only held on the operating handle 3 by friction between the fitting surfaces of the cap part 19 and the operating handle 3, so the holding force when attached depends on the hole size of the cap part 19. The lock cover changes, and as the fitting surface wears and deforms during repeated attachment and detachment, the holding force decreases, making it easy for the lock cover to fall off or lose its locking function.

(2) A circuit breaker with a single pole configuration and a circuit breaker with a multi-pole configuration such as two or three poles by connecting the operation handle of a single pole circuit breaker have different width dimensions of the operation handle. A lock cover cannot be applied, and a dedicated lock cover is required for each, which increases the number of types of parts and increases costs.

(3) The lock cover is locked through the through hole 2 of the operating handle 3.
2 and the lock 21 through the through hole 23 of the lock cover 17.
The reason for this is that the mold can be cut in two directions, and the mold for molding becomes double-separated.

Currently, drilling is a special process that is not applied to standard products and is only applied to ordered products.

It was becoming expensive.

In the example described in Japanese Utility Model Application Publication No. 54-53667, the lock cover can be shared with a single-pole circuit breaker and a multi-pole circuit breaker in which the operation handle of the single-pole circuit breaker is connected, but the lock cover becomes loose, The problem of falling off has not been sufficiently improved, and the example described in Japanese Utility Model Application Publication No. 59-98557 is designed to prevent the lock cover from loosening and falling off. The point that each requires a dedicated lock cover has not been improved. Furthermore, these conventional examples do not take into consideration the locking of the lock cover, and as with the conventional examples shown in FIGS. 9 and 10, there is a problem in that the operation handle cannot be locked without special processing.

An object of the present invention is to be able to apply the same lock cover to single-pole and multi-pole circuit breakers regardless of the width dimension of the operating handle, and to make it possible to share parts, and to always maintain the lock cover in the locked position. An object of the present invention is to provide a handle locking device for a circuit breaker that can be secured and is highly reliable.

[Means for solving problems]

The above purpose is that the lock cover has two receiving plates that touch both the front and rear sides of the operating handle in the rotating direction, a connecting plate that connects one end of each of these receiving plates, and a connecting plate that is provided on the connecting plate and that is attached to the operating handle. The circuit breaker has a protrusion that fits into a recess on a side surface, and a support plate that is connected to one of the receiving plates and abuts the upper surface of the circuit breaker case, and is attached to the operating handle from the side and locked to the support plate. This is achieved by having an elastically deformable cantilevered arm-shaped engaging portion that is locked inside the opening of the circuit breaker case from which the operating handle protrudes when the cover is attached.

[Effect]

The lock cover is attached to the operating handle from the side so that the protrusion of the connecting plate fits into the recess on the side surface of the operating handle. When the lock cover is attached, the cantilevered arm-shaped engagement part provided on the support plate of the lock cover is pushed up and elastically deformed by the top surface of the circuit breaker case, and then returns to its initial state and is fixed to the circuit breaker case. It is locked inside the opening and prevents the lock cover from being removed. As a result, the lock cover is held so that it cannot easily come off in either the upward or lateral direction, and the two receiving plates that touch the front and back sides of the operating handle and the support plate that touches the top surface of the circuit breaker case This acts to prevent rotation of the operating handle. Even in a multi-pole circuit breaker such as a two-pole or three-pole circuit breaker, the same lock cover as in the case of a single-pole construction can be applied by attaching the lock cover to the end of the interlocking operation handle from the side.

In addition, if a locking bridge-shaped protrusion is provided on the support plate of the lock cover to form a gap between the support plate and the cantilevered arm-shaped engagement part to allow the arm of the lock to pass through, the above-mentioned gap can be provided. The arm of the lock inserted through the lock can prevent the cantilevered arm-shaped engaging part from coming off the circuit breaker case entrance, without any special processing such as providing a through hole in the operating handle.
The lock cover can be locked.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 shows a case in which the present invention is applied to a single-pole circuit breaker. An operating handle 3 protrudes from the opening 2 of the circuit breaker case 1, and by rotating the operating handle 3 left and right,
The electrical circuit is opened and closed.

4 is a recess on the side of the handle for inserting a connecting piece that connects the multi-pole operation handles when a multi-pole circuit breaker such as two-pole or three-pole circuit breakers is constructed by combining multiple single-pole circuit breakers. It has been established.

As shown in FIGS. 1 and 2, the lock cover 5 is
Two receiving plates 6a and 6b contacting both the front and rear sides of the operating handle 3 in the direction of rotation, and a connecting plate 7 connecting one end of each of these receiving plates in a U-shape.

The connecting plate 7a has a prismatic protrusion 8 that fits into the recess 4 on the side surface of the operating handle 3, and a support plate 9 that connects to one of the receiving plates 6a and abuts the upper surface of the circuit breaker case 1. ,
The support plate 9 is provided with a cantilevered arm-like engagement portion 10 for preventing removal and a bridge-like protrusion 11 for locking.
Connecting plate 1 provided between the upper ends of both receiving plates 6a and 6b for reinforcement
2 and are integrally molded from synthetic resin. The cantilevered arm-shaped engaging portion 10 is formed between two grooves 13 provided on the side edge of the support plate 9, and has a protrusion 10a at its tip that always projects from the lower surface of the support plate 9. It is formed.

The bridge-shaped protrusion 11 is provided on the support plate 9 so as to straddle the cantilever arm-shaped engagement part 10, and forms a gap 14 between it and the engagement part 10.

When attempting to lock the operating handle 3 in the closed position using the lock cover 5 configured in this way, both receiving plates 6a
, 6b toward the handle 3 side, and push in the direction of arrow a in FIG.

It is attached to the operating handle 3 from the side. At this time, both receiving plates 6
a and 6b are in contact with both the front and rear sides of the operating handle 3 in the rotating direction, and the protrusion 8 of the connecting plate 7 fits into the recess 4 on the side of the handle, so that the protrusion 10a of the one-cantilever arm-shaped engagement part 10 is blocked. It hits the frame portion 1a on the top surface of the container case 1 and is pushed up, so that the single cantilever arm-shaped engaging portion 10 is elastically deformed.
It is displaced as shown by strand 11A10' in FIG. After that, when the lock cover 5 is further pushed in the direction of the arrow a, the protrusion 8 of the connecting plate 7 is completely fitted into the recess 4 on the side of the handle, and the protrusion 10a of the cantilever arm-like engagement part 10 is pushed into the frame part 1a. The lock cover 5 returns to the initial state by overcoming this, and is locked inside the opening 2 of the circuit breaker case as shown by the solid line in FIG. 4, thereby preventing the lock cover 5 from being removed in the opposite direction to the mounting direction.

With the lock cover 5 attached in this manner, even if you try to operate the operating handle 3 to the open position, the receiving plate 6a
The support plate 9 connected to the circuit breaker case 1 contacts the upper surface of the circuit breaker case 1, thereby preventing the handle 3 from rotating. Handle 3
When trying to lock the lock cover 5 in the open position,
A similar function can be obtained by attaching the handle 3 from the opposite side. As shown in Figure 3, the lock cover 5
If the cantilevered arm-like engaging part 10 is located near the inner end surface of the opening 2 on the opposite side of the operating handle 3 when the handle is mounted, the cantilevered arm-like engaging part 10 will be attached to the handle. It also serves as a stopper against rotation, making the handle lock even stronger.

When detaching the lock cover 5, it is sufficient to overcome the elastic restoring force of the cantilever arm-shaped engagement portion 10 and pull it out in the opposite direction to the attachment direction.

Next, locking of the lock cover 5 will be explained.

Cantilever arm-shaped engagement portion 10 that prevents the lock cover 5 from being removed
When the lock cover 5 is attached or removed, the protrusion 10a at the tip thereof is deformed by a displacement amount A as shown in FIG. It will change from B to B. Since the relationship between the gap dimensions is C=A + B, a lock 15 having an arm 15a with a diameter larger than B is used, and the arm 15a is inserted into the gap 14 as shown in FIG. By locking, the cantilever arm-shaped engaging portion 10 is restricted in its displacement amount, and the protrusion 10a cannot get over the Wt edge 1a, making it impossible to separate from the lock cover 5. This makes the handle lock function more complete, which prevents anyone other than the administrator from operating the handle without permission.

FIG. 5 shows the locked state when this handle locking device is applied to a single pole circuit breaker.

FIG. 6 shows a case where this handle locking device is applied to a three-pole circuit breaker, in which a chain of multiple poles is connected by a connecting piece 16 using the same lock cover 5 as in the case of a single-pole circuit breaker. I
It can be seen that the J operation handle 3 can be locked at the same time.

FIGS. 7 and 8 show modified examples of the lock cover.

In this example, a cantilevered arm-shaped engaging portion 10' having a protrusion 108' that is engaged with a corner of the operating handle 3 is provided on the open end side of one receiving plate 6a of the lock cover 5, and A lock 1 is provided between the protrusion 11' and the cantilever arm engaging part lO'.
The difference from the previous embodiment is that a gap 14' is formed through which the arm portion 15a of No. 5 is inserted to prevent the lock cover from being removed and to lock the lock cover. By providing the interlocking operation handle at a position apart from the connecting piece 16 shown in FIG. 1, it can be applied to a circuit breaker having a multipolar configuration.

〔Effect of the invention〕

In the handle lock device of the present invention, the lock cover is attached from the side to the operating handle protruding from the circuit breaker case, the protrusion provided on the connecting plate fits into the recess on the side of the handle, and the The deformable cantilevered arm-like engagement part locks inside the opening of the circuit breaker case to hold the lock cover in place, allowing single-pole configurations with different operating handle widths to be used. A lock cover of the same size can be shared with a circuit breaker and a multi-pole circuit breaker such as a two-pole or three-pole circuit breaker, and costs can be reduced in terms of both manufacturing and management costs. In addition, it is possible to provide a highly reliable handle locking device that is less susceptible to dimensional accuracy, wear, and deformation in the attached state of the lock cover, and that does not cause the lock cover to loosen or fall off even if it is repeatedly attached and detached.

Furthermore, by providing a bridge-like protrusion for locking on the support plate of the lock cover, which forms a gap between the cantilever arm-like engagement part and a gap through which the arm of the lock can be inserted, the operation handle can be attached to the support plate for locking. The special hole punching requires no machining or complicating the mold for forming the operating handle, and the construction is simple and inexpensive, and the lock can be locked at any time as needed. Can provide an easy-to-use handle lock device 2

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the relationship between a lock cover and an operating handle in an embodiment of the present invention, and FIG. 2 is a perspective view of the lock cover seen from the opposite side to FIG. 1. Figure 3 is a cutaway side view showing how the lock cover shown in Figures 1 and 2 is attached, Figure 4 is a sectional view taken along line E-E in Figure 3, and Figure 5 shows the handle locking device with a single pole cut-off. FIG. 6 is a perspective view of the same applied to a three-pole circuit breaker, FIG. 7 is a perspective view of a modified example of the lock cover, and FIG. F sectional view, Figure 9 is a perspective view showing the relationship between the conventional lock cover and the operating handle, and Figure 10 is
This figure is a cutaway side view showing the lock cover shown in FIG. 9 in an attached state, and FIG. 11 is a perspective view of the lock cover in the same locked state. 1... Circuit breaker case 2... Opening 3... Operation handle 4... Recess on the side of the handle 5... Lock cover 6a, 6b... Receiving plate 7... Connecting plate 8... Protrusion Part 9...Support plate
10... Cantilevered arm-shaped engagement part 11... Bridge-shaped protrusion part 14... Gap 15... Lock 1
5a... Arm attorney Patent attorney Junnosuke Nakamura 1 Figure 3-E 971〆Oki゛・7''''-t2 vs = Tachibana 9

Claims (1)

[Claims] 1. A handle locking device for a circuit breaker, in which a lock cover is attached to an operating handle protruding from a circuit breaker case to restrain the operating handle in an open or closed position. , two receiving plates that are in contact with both the front and rear surfaces in the rotating direction of the operating handle, a connecting plate that connects one end of each of these receiving plates, and a connecting plate that is provided on the connecting plate and fits into a recess on the side surface of the operating handle. and a support plate that is connected to one of the receiving plates and comes into contact with the upper surface of the circuit breaker case, so that it can be attached to the operating handle from the side, and the lock cover is attached to the support plate. A handle locking device for a circuit breaker, comprising an elastically deformable cantilevered arm-shaped engaging portion that is locked inside an opening of a circuit breaker case from which an operating handle protrudes when mounted. 2. The support plate further includes a bridge-like protrusion for locking that forms a gap between the support plate and the cantilever arm-like engagement part through which the arm of the lock can be inserted. 2. The circuit breaker handle locking device according to claim 1.