JPH0511612Y2 - - 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.

Generally, this interlock device is
An interlocking mechanism that links the on/off switching operation of the control equipment and the rotating operation of the operating handle, and the door is locked so that it cannot be opened when the operating handle is on, and the door is locked so that the door cannot be opened when the operating handle is turned on. It has a structure with a locking mechanism that prevents the state from being changed.

As a conventional interlock device, there is one described, for example, in Japanese Patent Publication No. 44773/1983.
As shown in FIGS. 11a and 11b (front view and bottom view, respectively), a lever member 74 is provided on the handle shaft of the handle 70 of the circuit breaker main body 100, and a lever member 74 is provided on the handle shaft of the handle 70 of the circuit breaker main body 100, and a lever member 74 is provided on the handle shaft of the handle 70 of the circuit breaker main body 100. Board 1
02 and the release lever 56, the release lever 56 moves and locks the handle 70. In the figure, 22 is the substrate, 5
8 is the release pin, 60 is the coil spring, 6
4 is a name plate ring, 80 and 82 are protrusions, 103 is an inclined portion, 104 is a hook portion, and 105 is a contact portion.

In this device, a lock plate 1 for preventing the door from opening is installed.
02 engages with the release lever 56, the closing prevention lock is released, the handle 70 can be operated, and the circuit breaker body 100 can be closed.

However, in this conventional interlock device, since the tip of the lock plate is exposed, the release lever 56 can be easily pushed by hand, and the lock can be easily released. There is a problem in that it can be easily operated by people other than those in charge of maintenance and inspection.

In order to solve these problems, the applicant proposed and filed an application for an interlock device with a structure that does not allow anyone to easily unlock it by hand. −118541).

FIG. 8 is a side sectional view showing an operating mechanism equipped with an interlock device according to the earlier application, FIG. 9 is a front view thereof, and FIG. 10 is an explanatory view showing its operating state. 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. The slide plate 7 is provided with an opening 7a, and the operating lever 9 of the switch 3 is inserted and attached to this opening 7a.

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 (see FIG. 10).
An opening 11a is provided on the front side of the guide frame 11, and the size of the opening 11a is such that a finger cannot fit therein, for example, a square hole of 7×14 mm. Further, as shown in FIG. 9, a door release lever 13 is rotatably attached to the handle fixing frame 2.
It is normally biased by a spring so that it is located at a position where it engages with a door locking hook provided on the door 4. In FIG. 9, 17 is a release device for opening the door in an emergency, and is fixed to the shaft of the door release lever 13.

As shown in FIG. 10, the door 4 is fitted with a lock release plate 4B that enters the opening 11a of the guide frame 11 and presses the operating portion 10a of the lock plate 10 when the door is closed. When the locking portion 10b at the tip of the door 10 and the lock plate 6 are unlocked and the operating handle 1 is operated from outside the door 4, the switch 3 can be turned on and off without any trouble. ing.

With this device, even if you try to push in the operation part 10a of the lock plate 10 with your hand when the door is open, your finger will not enter through the opening 11a of the guide frame 11, so you will not be able to release the lock, and the operation handle will be inadvertently pressed. Operation of 1 will not cause accidents such as electric shock or explosion.

[Problem that the invention attempts to solve]

However, in the interlock device according to this conventional proposal, the lock plate 10 is moved by the moving distance of the lock release plate 4B and is released from the locked state.
It is necessary to provide a sufficiently large moving distance, and also to provide some extra distance at the final stage after the lock plate 10 is detached. Therefore, there is a risk that the door may not be fully closed and may be unlocked with a gap remaining between the door and the frame. In such a situation, it is possible to turn on the control equipment by turning the operating handle 1 with a gap remaining in the door, and if an internal accident occurs at that time, there is a risk that flames may escape outside the door. It was hot.

This invention was devised in view of these conventional problems, and the purpose is to improve the safety of the interlock by allowing the lock to be released when the door is sufficiently closed. shall be.

[Means for solving the problem]

In order to achieve this purpose, the door interlock device for a control device of the present invention exposes the operating handle to the outside through an opening formed in the door of the control device, and allows the on/off switching operation of the control device to be performed using the operating handle. In the operating mechanism of the control device that is operated by rotation, a cam plate is attached to the handle shaft of the operating handle, a base end of the locking plate is rotatably attached to the handle fixing frame, and the operating handle is in the off position. When the door is closed, the tip of the locking plate is configured to engage the cam plate and prevent the operating handle from rotating toward the input position, and the tip of the lock release plate formed on the door when the door is closed. The lock plate is configured such that when the lock plate is pressed, the engagement between the tip of the lock plate and the cam plate is released, and the lock plate is connected to the lock release plate 4.
Cover it with a guide frame that has an opening large enough to allow the tip of B to go in and out, but not to insert your finger.
In addition, the door is characterized in that the abutting portion of the lock release plate formed on the door with respect to the lock plate is formed at a portion of the lock plate closer to the proximal end between the proximal end and the distal end.

〔Example〕

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

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing how the lock plate and the handle fixing frame are attached. The difference between this embodiment and the conventional device shown in FIGS. 8 to 11 is that the lock plate 10
The base end of the lock release plate 4 is attached to the handle fixing frame side, and the lock release plate 4 is provided on the door 4 to perform the lock release operation.
B is made to act halfway in the longitudinal direction of the lock plate, and the engagement between the locking part at the tip of the lock plate and the cam plate is ensured.
The reason is that the release stroke is amplified. In this embodiment, elements having the same functions as those of the conventional configuration shown in FIGS. 8 to 10 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, as shown in FIG. 1, a guide frame 11 is provided on the side of the handle fixing frame 2, and a lock plate 10 is attached inside the guide frame 11 as shown in FIG. That is, lock plate 1
The proximal end of the guide frame 11 is rotatably mounted around a rotating shaft screw 18 that also serves to fix the guide frame 11, and a locking portion 10b that locks onto the cam plate 6 is provided protruding from the other end.
This locking portion 10b has a stepped portion 10c to provide a function to prevent erroneous insertion, which will be described later. When the door is opened, the lock plate 10 is biased by a spring 12 so that the operating handle 1 engages with the cam plate 6 when it is turned off. The handle fixing frame 2 is provided with a hole 2a into which the protruding locking portion 10b of the lock plate 10 is inserted and a hole 2b into which the locking claw 11b of the guide frame 11 is locked. In the figure, 19 is a spring washer. An opening 11a is provided on the front side of the guide frame 11 near the rotating shaft screw 18, and the size of the opening 11a is such that a finger cannot fit therein, for example, a square hole of 7×14 mm.

As shown in FIG. 3, a door release lever 13 is rotatably attached to the handle fixing frame 2 by a shaft 14, and is normally in a position where it engages with a door locking hook 4A provided on the door 4. It is urged by a spring 15 to be in this position. 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 line in FIG. It's getting old.

In FIG. 1, 17 is a release device for opening the door in an emergency, and is fixed to the shaft 14 of the door release lever 13.

FIGS. 3 and 4 are views showing the operation of the locking hook 4A and the lock plate 10 when the door 4 is in an open state and a closed state.

As shown in FIG. 3, the door 4 is attached with a lock release plate 4B that enters the opening 11a of the guide frame 11 and presses the operating portion 10a of the lock plate 10 when the door is closed. As shown in the figure, when the lock plate 10 is released from the locked state and the operating handle 1 is operated from outside the door 4, the switch 3 can be turned on and off without any trouble.

At the tip of the door locking hook 4A, there is a tapered part 4a and an engaging part 4b as shown in the schematic diagram of FIG.
When the door is closed as shown in FIG. 5a, the door release lever 13 is pushed away against the urging force of the spring 15, and through the process shown in b
Bring the door to the closed position shown in . 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 to the OPEN side and rotating the door release lever 13, or by turning the emergency release device 17, the door locking hook 4A is locked as shown in Fig. 5d. The engagement with the portion 4b is released 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 operation part 10a of the lock plate 10, and the lock plate 10 is
is moving backwards. The state at this time is shown in Figure 7a-
1, shown in a-2. 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 turned on. Figure 6b
is in the input state. In the state shown in FIG. 6b, the door release lever 13 is in the locked state, and the door 4 is in the locked state.
I can't open it. FIG. 6c 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. In the state shown in FIG. 6c, the door 4 is opened, so the lock release plate 4B separates from the operating end 10a of the lock plate 10, and the lock plate 10 moves in the direction of extension of the spring 12 due to the restoring force of the spring 12. . In this state, the locking portion 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. Cam plate 6
loses its support and becomes completely released as shown in Fig. 7 b-1 and b-2. Even if an attempt is made to switch the operating handle 1 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 this way, the device performs locking and unlocking operations of the operating handle.

As shown in FIG. 7, when the door 4 is moved from the open state to the closed state, the lock release plate 4B pushes the lock plate 10.
As shown in Figure a-2, it is set not at the tip of the lock plate 10 but in the middle. If the distance from the center of the screw 18 to the operating part 10a is A, and the distance from the center of the screw 18 to the locking part 10b is B, then the locking part 1
If the stroke of 0b separating from the cam plate 6 is s, then the moving distance l of the lock release plate 4B of the door 4 required to move this stroke is l=s
×A/B will suffice. For example, A/B=
When it is set to 1/4 and s=5 mm, l=1.25 mm. This means that when closing the door 4, the cam plate will not be unlocked unless the door 4 is pushed all the way in. If the door 4 is not fully closed, the operating handle must be turned on. This will lead to improved safety.

Note that by providing the step portion 10c on the locking portion 10b, the door is in a state where it is partially closed, that is, the door locking hook 4A for preventing the door from being opened is engaged with the door release lever 13, but the door itself In an incompletely closed state where the locking device (not shown) is not engaged and a gap remains between the door and the frame, the cam plate 6 cannot pass over the locking portion 10b. By being locked to the stepped portion 10c so that the lock is not completely released, safety can be further enhanced.

[Effect of idea]

As explained above, in the present invention, the lock plate that holds and releases the locked state with respect to the cam plate is a lever type, and the operating part of the lock release plate formed on the door is set in the middle of the lock plate. There is. As a result, the operating stroke of the lock release plate relative to the lock plate is amplified, and the cam plate is unlocked. Therefore, the lock state of the cam plate is released by the final operation of closing the door, and the lock is not released if the door is incompletely closed. In this manner, according to the present invention, the switch can be operated using the operating handle only when the door is completely closed, thereby ensuring safety.

[Brief explanation of the drawing]

Fig. 1 is a front view of the embodiment of the present invention, Fig. 2 is an exploded perspective view of the main parts, Fig. 3 is a partially cutaway plan view when the door is open, and Fig. 4 is a partially cutaway plan view when the door is closed. Figure, 5th
The figure is an explanatory diagram showing the locked state of the door, Figure 6 is an explanatory diagram showing the operating state of the operating handle and the operation of each part,
FIG. 7 is an explanatory view showing the engagement relationship between the lock plate and the cam plate, FIG. 8 is a side sectional view of the interlock device proposed earlier by the applicant, FIG. 9 is a front view thereof, and FIG.
FIG. 0 is an explanatory diagram showing its operation, and FIG. 11 is an explanatory diagram of a conventional operating handle. 1... Operation handle, 2... Handle fixing frame,
2a, 2b...hole, 3...switch, 4...door,
4A...Door lock hook, 4B...Lock release plate,
4a... Taper part, 4b... Locking part, 5... Handle shaft, 6... Cam plate, 7... Slide plate, 8
... Pin, 9 ... Operation lever, 10 ... Lock plate, 10a ... Operation part, 10b ... Locking part, 10
c...Step, 11...Guide frame, 11a...Opening, 12...Spring, 13...Door release lever, 14...Shaft, 15...Spring, 16...
... Pin, 17 ... Release device, 18 ... Rotating shaft screw, 19 ... Spring washer.

Claims (1)

[Scope of utility model registration request] In the operating mechanism of the control device, the operating handle 1 is exposed to the outside through an opening formed in the door 4 of the control device, and the switching operation of the on/off of the control device is performed by rotating the operating handle 1. A cam plate 6 is attached to the handle shaft 5 of the handle 1, and the base end of the lock plate 10 is rotatably attached to the handle fixing frame 2, and when the operating handle 1 is in the off position, the lock plate 10 is The distal end engages with the cam plate 6 to prevent the operating handle 1 from rotating toward the input position, and when the door 4 is closed, the distal end of the lock release plate 4B formed on the door 4 releases the lock plate. 10 is pressed, the engagement between the tip of the lock plate 10 and the cam plate 6 is released, and the tip of the lock release plate 4B can move in and out of the lock plate 10. The door 4 is covered with a guide frame 11 having an opening 11a large enough to prevent the insertion of a finger, and the contact portion of the lock release plate 4B formed on the door 4 with respect to the lock plate 10 is connected to the base of the lock plate 10. 1. A door interlock device for a control device, characterized in that the door interlock device is formed at a portion closer to a proximal end between an end and a tip.