JPS6226963Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an interlock device used in high-risk equipment and facilities such as switchboards.

(Prior art) For example, when inspecting and repairing a power distribution board,
To prevent electric shock accidents, it is necessary to cut off the energized circuit to the switchboard before opening the door. As a device that meets this demand, a cam is attached to the handle shaft of a handle device that locks the door to the box body, and when the handle shaft is turned to unlock the door, the cam operates a micro switch. Some are designed to open the electrical circuit to the switchboard.

(Problem that the invention aims to solve) However, in this conventional device, the micro switch and the handle shaft are directly linked via a cam, so while the door is open for inspection etc.
If someone else accidentally rotates the handle shaft in the opposite direction to the original door locking position, the electric circuit will be closed again, potentially causing an electric shock accident for the worker.

Therefore, the purpose of this invention is to make it impossible to turn the handle shaft to the door unlock position and open the door unless the electric circuit is opened, and to close the electric circuit even if the handle shaft can be turned while the door is open. Therefore, it is an object of the present invention to provide an interlock device that is extremely useful for ensuring the safety of workers.

(Means for Solving the Problems) The interlock device for a switchboard of the present invention will be explained below based on the drawings. The interlock device for a switchboard of the present invention is installed on the door 1 side, and is connected to and disengaged from the handle shaft 3 with a receiving part on the fixed frame 4 side. a handle device 2 which is connected to a latch plate 5; a lock device 6 which is mounted on the door 1 side and which is equipped with a slide plate 8 interlocking with a lock shaft 7; the handle shaft 3 and the lock shaft 7;
When the door is in the locked position, the handle shaft 3 is made unrotatable, and when the lock shaft 7 is turned a predetermined angle from the door locked position, the handle shaft 3 is made rotatable, and the handle shaft 3 is moved to the door unlocked position. an interlocking device that makes the lock shaft 7 unrotatable when the lock shaft 7 is turned by a predetermined angle; a slide plate restraining device that blocks the movement of the slide plate 8 when the door is in the open position and releases the suppression of the slide plate when the door is closed; A switch device 11 that opens and closes the power supply circuit by rotating the lock shaft 7.
The interlocking device is composed of a first disk 9 that is non-rotatably fitted to the handle shaft 3, and a second disk 10 that is non-rotatably fitted to the lock shaft 7, both having the same diameter. Circular notches 12 and 13 having the same radius of curvature as the disk body are provided in a part of the circumference of each of the first disk 9 and the second disk, while the slide plate restraining device is connected to the guide block 1 fixed to the case 14.
5, and a release operation plate 16 fixed to a fixed frame 4 such as a box body of a switchboard, and the guide block 15 has a guide groove into which an end 8a of a slide plate 8 is slidably inserted. 17, and a receiving hole 18 for a locking body perpendicular to the guide groove 17, and a locking hole 20 and a narrow passage 21 communicating with the locking hole 20 are provided in the slide plate end 8a in the sliding direction, and the receiving hole 18 A locking body 22 having a protruding small diameter portion 22a at its tip that can pass through the passage 21 is loosely fitted into the locking body 22, and the locking body 22 is slidably biased toward the slide plate 8 by a coil spring 23, and the guide block 15 is provided with a small diameter hole 24 on an extension of the receiving hole 18 across the guide groove 17, and the small diameter hole 24 is provided at the tip of the release operation plate 16.
4 has a push pin 25 fixed thereto which can be freely fitted and removed.

(Embodiment) In the illustrated embodiment, the upper end of the slot-like passage 21 communicating with the lock hole 20 is formed in the large diameter hole portion 19, but the passage is the same over its entire length including the upper end. It can also be formed in the form of a wide slot. The switch device 11, which is a micro switch, is opened and closed by a cam 26 integrated with the second disc 10, as shown in FIGS. 2 and 3.

As shown in FIGS. 2 and 3, an interlocking pin 29 is protruded from the back surface of the second disk 10 at an eccentric position. As shown in FIG. 2, the slide plate 8 is housed in the case 14 so as to be slidable in the vertical direction.
As shown in the figure, the interlocking pin 29 is engaged with the through hole 28.

(Function) In Figures 2 to 4, the door 1 is closed and locked, and the electric circuit is closed. In this state,
Since a part of the circumference of the second disk 10 is inserted into the notch 12 of the first disk 9, the handle shaft 3 cannot rotate. In this door closed and locked state, as shown in FIG. As shown in FIG. 4, the small diameter portion 22a of the locking body 2
The upper end large-diameter hole 19 is engaged with the upper end large diameter hole 19 .

Therefore, the key 27 is inserted into the lock device 6 as shown in FIG. 4, and the lock shaft 7 is locked in FIG.
When the second disk 10 is turned 90 degrees counterclockwise,
The slide plate 8 is pushed by the interlocking pin 29 and slides upward as shown in FIG. At this sliding end, the lock hole 2 is opened as shown in FIGS. 5 and 6.
0 will face the locking body receiving hole 18. Further, since the actuator 11a of the switch device 11 is pushed by the cam 26 during the rotation of the second disc 10, the power supply circuit is opened.

When the lock shaft 7 is rotated 90 degrees counterclockwise in this way, the first disk 9 is rotated as shown in FIG.
Since the second disk 10 escapes from the notch 12 of a and faces the notch 13 of the second disk 10, the handle shaft 3 is rotatable.

Therefore, when the handle shaft 3 is turned 90 degrees clockwise in FIG. can be released by unraveling. In this door unlocked state, as shown in FIG.
3, the rotation of the lock shaft 7 is prevented.

Now, when you pull door 1 toward you, guide block 1
The release operation plate 16 is removed from the back surface of the locking body 22 and the push pin 25 is removed from the small diameter hole 24, so that the main body of the locking body 22 is inserted into the locking hole 20 as shown in FIG.
rush into. Since the main body portion of the locking body 22 has a large diameter and cannot pass through the passage 21, the slide plate 8 is stopped in its raised position.

Therefore, even if a part of the circumference of the first disk 9 escapes from the notch 13 of the second disk 10 by turning the handle shaft 3 counterclockwise, the lock shaft 7 that is interlocked with the slide plate 8 rotation is not possible.
Therefore, the actuator 1 of the switch device 11
1a continues to be pushed by the cam 26, and the power supply circuit to the power distribution board etc. is maintained in a cut-off state.

The device of this example is equipped with a toggle mechanism consisting of a guide rod 30 and a compression coil spring, and a handle shaft 30.
is rotationally biased.

(Effect of the invention) As described above, in the interlock device of the present invention, the handle shaft 3 cannot be rotated unless the lock shaft 7 is turned in a predetermined direction by a predetermined angle to shut off the power supply circuit. When the door 1 is opened by releasing the door 1, the power supply circuit is always cut off. Then, when the lock shaft 7 is rotated to the position where the power supply circuit is cut off and the door 1 is opened, the lock shaft 7
The slide plate 8 connected to is accurately held in this circuit breaking position by the slide plate restraint device,
This restraint on the slide plate 8 will not be released unless the door 1 is returned to the completely closed position, so no matter how you turn the handle shaft 3 while the door 1 is open, you will not be able to turn the lock shaft 7. , the power supply circuit maintains the cut-off state.

That is, in the interlock device of the present invention, door 1
The power supply to the object will not be resumed unless the door is closed and locked, ensuring the safety of workers during inspection and repair.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view showing the entire interlock device, FIG. 2 is a cutaway rear view of the main part of the interlock device with the door closed and locked, and FIG. A cutaway right side view of the main part of the interlock device with the door closed and locked;
FIG. 4 is a sectional view taken along line A-A' in FIG. Fifth
The figure shows the lock shaft being rotated 90 degrees counterclockwise from the state shown in Figure 2.
Rear view of the interlock device when rotated once;
FIG. 6 is a sectional view taken along line B-B' in FIG. 5. FIG. 7 is a vertical sectional view of the main part of the interlock device when the door is opened. FIG. 8 is a rear view when the handle shaft is rotated 90 degrees clockwise from the state shown in FIG. 5. FIG. 9 is a rear view of the slide plate used in the interlock device, FIG. 10 is a rear view of the guide block used in the interlock device, FIG. 11 is a sectional view taken along the line D-D in FIG. FIG. 12 is a sectional view taken along line CC in FIG. 9. DESCRIPTION OF SYMBOLS 1... Door, 2... Handle device, 3... Handle shaft, 4... Fixed frame, 5... Latch plate, 6... Lock device, 7... Lock shaft, 8... Slide plate,
9...First disc, 10...Second disc, 11...Switch device, 14...Case, 15...Guide block, 16...Opening operation plate, 17...Guide groove, 19...At the upper end of the passage Large diameter hole, 20... lock hole, 21... passage, 22... locking body, 24...
Small diameter hole, 25... push pin, 26... cam for switch operation, 27... key, 29... interlocking pin.

Claims (1)

[Scope of utility model registration request] A frame body 4 is attached to the door 1 side and fixed to the handle shaft 3.
A handle device 2 that connects a latch plate 5 that engages and disengages with a receiving portion on the side; a lock device 6 that is attached to the door 1 side and has a slide plate 8 interlocked with a lock shaft 7; the handle shaft 3 and the lock shaft 7. is installed between the door and the handle shaft 3 to prevent rotation when the door is in the locked position,
An interlocking device that enables the handle shaft 3 to rotate when the lock shaft 7 is turned a predetermined angle from the door lock position, and disables the lock shaft 7 from rotating when the handle shaft 3 is turned to the door unlock position; A sliding plate restraining device that restrains the sliding of the sliding plate 8 when the door is in the closed position and releases the restraining of the sliding plate 8 when the door is closed; and a switching device 11 that opens and closes the power supply circuit by the rotation of the locking shaft 7. , the interlocking device is composed of a first disc 9 that is non-rotatably fitted to the handle shaft 3, and a second disc 10 that is non-rotatably fitted to the lock shaft 7, and the first disc 9 and the second disc 9 have the same diameter. Circular notches 12 and 13 having the same radius of curvature as the disk body are provided in a part of the circumference of the second disk. The guide block 15 has a guide groove 17 into which the end 8a of the slide plate 8 is slidably inserted, and a release operation plate 16 fixed to the fixed frame 4. A receiving hole 18 for a locking body is provided, and a locking hole 20 and a narrow passage 21 communicating with the locking hole 20 are provided in the slide plate end 8a in the sliding direction, and the receiving hole 18 has
A locking body 22 having a small diameter portion 22a protruding from its tip that can pass through the passage 21 is loosely fitted, and the locking body 22 is urged to slide toward the slide plate 8 by a coil spring 23. A small-diameter hole 24 is provided on the extension of the receiving hole 18 across the guide groove 17, and a pushing pin 25 that can be freely inserted into and removed from the small-diameter hole 24 is fixed to the tip of the release operation plate 16. Interlock device.