JPH047534Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a door interlock device provided on an external operating handle of a control device such as a circuit breaker in a control center or the like.

[Conventional technology]

When a control device such as a circuit breaker is housed in a box such as a control center, the operating handle of the control device is placed in the front of the box by cutting out the door so that it can be operated externally with the door closed. . The operating handle is used to turn on and off a circuit breaker, etc. with the door closed. Turning on the door with the door open or opening the door while the circuit is powered on can lead to electric shock or accidents, so the operating handle must be installed to prevent such operations. and door interlock.

By the way, in order to inspect internal equipment, it may be necessary to turn on the circuit breaker with the door open. However, a safety device is provided to prevent the operating handle from being turned on inadvertently in that case.

A conventional interlock device with a safety device is disclosed in Japanese Utility Model Publication No. 53-46529. This is a sliding plate for operating the circuit breaker lever that is linked to the rotation of the operating handle, and is equipped with a locking plate that prevents the door from moving when the door is in the open state. The circuit breaker can be turned on with the door open by operating the .

[Problem that the invention attempts to solve]

However, in this conventional interlock device, the tip of the lock plate is exposed, so it can be easily pushed by hand and unlocked, making maintenance and inspection difficult for electrical managers and others. There is a problem in that it can be easily operated by anyone other than the person in charge.

SUMMARY OF THE INVENTION In view of these conventional problems, it is an object of the present invention to provide an interlock device with a structure that does not allow anyone to easily release the lock using their hands or the like.

[Means for solving problems]

In order to achieve this purpose, the interlock device of the control device of the present invention includes an interlocking mechanism that interlocks the on/off switching operation of the control device and the rotating operation of the operating handle, and a door lock when the operating handle is in the on state. In a door interlock device for a control device, the door interlock device has a locking mechanism that locks the door to prevent it from opening and prevents the operating handle from being switched to the on state when the door is open. The operating end of the lock plate that locks the door is covered with a safety plate having a tool insertion opening large enough to prevent insertion of a finger.

[Effect]

In the present invention, the operating end of the locking plate is covered with a safety plate having a small tool insertion opening.
If it is necessary to turn on or off a circuit breaker, etc. with the door open during maintenance or inspection, insert a tool, such as the tip of a screwdriver, through the opening in the safety plate and press the lock plate to release the lock. The operating handle can be operated.

Even if you try to press the lock plate without using a tool, your fingers will not fit through the opening in the safety plate. This prevents you from turning on the operating handle carelessly.
This can prevent electric shocks and spillover accidents.

〔Example〕

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

FIG. 1 is a side sectional view showing an operating mechanism equipped with an interlock device according to the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a plan view thereof. In these figures, reference numeral 1 denotes an operating handle, which is attached to the front surface of a switch 3 such as a circuit breaker by means of a handle fixing frame 2. 4 is a door attached to the front of the unit frame so that it can be opened and closed. A cam plate 6 is fixed to the handle shaft 5 of the operating handle 1, and a pin 8 for vertically moving a slide plate 7 is attached to the cam plate 6. Slide plate 7
is provided with an opening 7a, and this opening 7a
The operating lever 9 of the switch 3 is installed in the inserted state.

A guide frame 11 on which a lock plate 10 is slidably provided is attached to the side of the handle fixing frame 2, and when the door is opened, the lock plate 10 is engaged with the cam plate 6 when the operating handle 1 is turned off. The plate 10 is biased by a spring 12. An opening 11a is provided on the front side of the guide frame 11, and the size of the opening 11a is large enough that a finger cannot fit therein, for example, 7×
It is a 14mm square hole. In addition, the door release lever 13 is attached to the shaft 1 on the handle fixing frame 2 as shown in FIG.
4, and is normally biased by a spring 15 to a position where it engages with a door locking hook 4A provided on the door 4. Further, a pin 16 is provided at the other end of the door release lever 13, and when the handle 1 is operated to the door open position, the pin 16 hits the cam plate 6 and rotates to the position shown by the dashed-dotted line in FIG. It's getting old.

In FIG. 2, reference numeral 17 denotes a release device for opening the door in an emergency, and is fixed to the shaft 14 of the door release lever 13.

The door 4 has the guide frame 11 when the door is closed.
the operating end 1 of the lock plate 10.
A lock release plate 4B that presses the door 0a is attached, and as shown in FIG. 4, when the lock plate 10 is released from the locked state and the operation handle 1 is operated from the outside of the door 4, the switch 3 It is configured so that it can be turned on and off.

As shown in FIG. 5, a tapered portion 4a and an engaging portion 4b are formed at the tip of the door locking hook 4A, and when the door is closed as shown in FIG. It is pushed away against the biasing force, and the door is brought to the closed position shown in c through the process shown in b. In this state, the door 4 cannot be opened because the tip of the door release lever 13 is engaged with the engaging portion 4b. By operating the operating handle 1 toward the open side and rotating the door release lever 13, or by rotating the emergency release device 17, the locking portion 4b of the door locking hook 4A is engaged as shown in FIG. 5d. is disengaged, and the door 4 can be opened.

FIG. 6 shows the operating state of the operating handle 1 and the operation of each part. A in the figure shows a state in which the door 4 is closed and the operating handle 1 is turned off.
In this state, the lock release plate 4B of the door 4 is in contact with the operating end 10a of the lock plate 10, and the lock plate 10 is
(see Figure 7a). To turn on a switch 3 such as a circuit breaker from this state, the operating handle 1 is turned on. At this time, since the lock plate 10 is retracted, the movement of the cam plate 6 is not obstructed, and the pin 8 is rotated, the slide plate 7 is raised, and the operating lever 9 of the switch 3 is closed. It becomes the closing state as shown in FIG. 6b. In the state shown in FIG. 6b, the door release lever 13 is in a locked state and the door 4 cannot be opened. 6th
FIG. c shows a state in which the release device 17 is turned with a screwdriver or the like to open the door 4 with the operation handle 1 turned on in an emergency. Since the door 4 is opened in the state shown in FIG. 6c, the lock release plate 4B is detached from the operating end 10a of the lock plate 10, and the lock plate 10 is moved as shown in FIG. 7b by the restoring force of the spring 12. It moves in the direction in which the spring 12 extends. In this state, the end 10b of the lock plate 10
is in contact with the cam plate 6, and when the operating handle is switched to the OFF state as shown in FIG. 6d,
The end 10b of the locking plate 10 loses support from the cam plate 6 and is completely released as shown in FIG. 7c. Even if an attempt is made to switch the operation handle to the ON state from this state, the lock plate 10 prevents the rotation of the cam plate 6, so the switching operation cannot be performed.

FIG. 6e shows the operation of opening the door 4 by further turning the operating handle 1 counterclockwise to tilt the door release lever 13 from the state a in which the door 4 is closed when the operating handle is off.

In the present invention, when the switch is turned on by operating the operating handle 1 with the door 4 open for inspection from the switch-off state shown in FIG. Insert it, and turn the operating handle 1 to the on side while pressing down the operating end 10a of the lock plate 10. At this time, the lock plate 10 normally prevents the rotation of the cam plate 6, but since this state has been released, the switch 3 can be turned on by turning the operating handle 1 without any problem.

When such a tool is not used, even if you try to push in the operating end 10a of the lock plate 10 by hand, your finger will not fit through the opening 11a of the guide frame 11, so you may accidentally operate the operating handle 1 and cause an electric shock. Will not cause accidents such as explosions.

[Effect of idea]

As explained above, in the present invention, the tip of the lock plate is covered with a guide frame having an opening. Therefore, it is impossible to release the lock manually, and the lock can only be released using a predetermined tool. Therefore, it is possible to prevent accidents caused by operation of the handle by someone other than an electrician in the event of a failure or the like.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a partially cutaway plan view when the door is open, Fig. 4 is a partially cutaway plan view when the door is closed, Fig. 5 is an explanatory diagram showing the locked state of the door, Fig. 6 is an explanatory diagram showing the operating state of the operating handle and the operation of each part, and Fig. 7 is an explanatory diagram showing the engagement relationship between the lock plate and the cam plate. be. 1... Operation handle, 2... Handle fixing frame,
3...Switch, 4...Door, 4A...Door locking hook, 4B...Lock release plate, 4a...Tapered part, 4b...Locking part, 5...Handle shaft, 6...
Cam plate, 7...Slide plate, 8...Pin, 9...
Operation lever, 10... lock plate, 10a... operating end, 10b... end, 11... guide frame, 11a
...Opening, 12...Spring, 13...Door release lever, 14...Shaft, 15...Spring,
16...Pin, 17...Release device.

Claims (1)

[Claims for Utility Model Registration] An interlocking mechanism that links the on/off switching operation of a control device with the rotating operation of an operating handle, and a locking mechanism that locks the door so that it cannot be opened when the operating handle is in the ON position. In a door interlock device for a control device having a locking mechanism that prevents the operating handle from being switched to the on state when the door is open, the lock plate locks the door when the operating handle is in the on state. A door interlock device for a control device, characterized in that an operating end of the door is covered with a safety plate having a tool insertion opening large enough to prevent insertion of a finger.