JPS6226962Y2 - - 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 high-voltage switchboards.

(Prior Art) For example, when inspecting and repairing a switchboard,
In order to prevent electric shock accidents, it is necessary to cut off the electrical circuit to the distribution board before the door is opened. In order to meet this requirement, a cam is attached to the handle shaft of the 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 microswitch, opening the electrical circuit to the distribution board.

(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 that not only can the door not be opened unless the electric circuit is opened, but once the door is opened, the handle shaft is fixed and cannot be freed unless the door is closed. The purpose of the present invention is to provide an interlock device that is excellent in ensuring safety.

(Means for Solving the Problems) The interlock device of the present invention will be explained below with reference to the drawings. An unlocking key 5, a first slide plate 6 that is interlocked with the handle shaft 4, a switch 7 that is incorporated in a power supply circuit to equipment and facilities such as a switchboard, and the switch that is interlocked with the first slide plate 6. 7 a second slide plate 8 for operation; a lock receiving plate 11 that is attached to the fixed frame 9 side and is removable from a lock hole 10 formed in the first slide plate 6; a locking body 12 which is biased and can be engaged and detached from the lock hole 10 from the opposite side of the lock receiving plate 11;
The first slide plate 6 is provided with a locking protrusion 13 continuous to the locking hole 10, and the lock receiving plate 11 is provided with a receiving hole 14 into which the locking protrusion 13 can be engaged and removed.

(Embodiment) In the illustrated embodiment, as shown in FIGS. 3 and 4, a link disk 15 is fitted and fixed to the tip corner shaft portion of the handle shaft 4, and the The protruding interlocking pin 16 engages with a passive hole 17 formed in the first slide plate 6, as shown in FIGS. 3, 6, and 9. The first slide plate 6 is guided by the left and right side walls 19 and 20 of the case 18 and slides in the vertical direction.

The second slide plate 8, which has a U-shaped cross section as shown in FIG. It is slidably guided in the left-right direction by the heads 23 and 24 and its own guide grooves 25 and 26. The mounting bolts 35 of the link disk 15 protrude from the case back plate 22, as shown in FIGS. 2 and 4.

As shown in FIG. 10, the second slide plate 8 is provided with a passive groove 27 bent in an F-shape.
As shown in FIGS. 9 and 13, a reinforcing plate 6a of the locking protrusion 13 is fixed to the center of the upper front end of the first slide plate 6 by welding. An interlocking pin 28 is welded to protrude from the portion. The interlocking pin 28 of the first slide plate 6 is engaged with the driven groove 27 of the second slide plate 8, as shown in FIG. Second slide plate 8
As shown in FIGS. 3 and 10, a cam plate 29 for operating a switch is fixed to one of the bent pieces 8a.

As shown in FIG. 4, a guide block 30 is further fixed between the front plate 21 and the rear plate 22 of the case. This guide block 30 has a fourth
5 and 11, a guide groove 31 for guiding the locking body 12 and a guide groove 32 for guiding the locking protrusion 13 are provided, and both guide grooves 31, 32 are orthogonal to each other.

(Function) Figures 1 to 5 show the door 1 in the closed and locked state. In this state, the first slide plate 6 is at the lowest position as shown in FIGS. 3 and 4. As shown in FIG. 4, the lock protrusion 13 is engaged with the receiving hole 14 of the lock receiving plate 11, and the locking body 12 is pushed by the lock receiving plate 11 and is in the retracted position. The door 1 is locked with respect to a fixed frame 9 such as a power distribution box by the engagement between the lock receiving plate 11 and the locking protrusion 13.

In addition, as shown in FIG. 3, the second slide plate 8
is located on the right side, and the micro switch type switch 7 has its plunger 7a connected to the cam plate 2.
Since it is pushed to 9, the circuit is closed.

Here, as shown in FIG. 4, insert the key 5 to unlock the handle shaft 4 from the catch body 3.
When the handle shaft 4 is turned 60 degrees clockwise in FIG. , is pushed by an interlocking pin 28 protruding from the center of the upper front end of the first slide plate 6,
It slides to the left in FIG.

As shown in FIG.
In order to escape through the receiving hole 14, the door 1 is unlocked from the fixed frame 9, and the door 1 can be opened.
Further, as shown in FIG. 6, the second slide plate 8
By sliding leftward, the plunger 7a moves against the cam plate 2.
9, the switch 7 is closed and the power supply to the power distribution board is cut off.

As shown in FIG. 7, when the lock receiving plate 11 is pulled out from the guide block 30 as the door 1 is opened, the locking body 12 is biased by the coil spring 33.
, instead of the lock receiving plate 11, instantly engages with the lock hole 10 of the first slide plate to stop the movement of the first slide plate 6. Therefore, rotation of the handle shaft 4 in conjunction with the first slide plate 6 is also prevented.

After completion of work such as inspection and repair, the lock body 12 remains engaged with the lock hole 10 until the lock receiving plate 11 pushes the lock body 12 with its tip by closing the door 1.

As shown in FIGS. 2, 4, and 7, a guide plate 34 for preventing the locking body 12 from escaping is fixed to the back plate 22 of the case.

(Effect of the invention) As described above, in the interlock device of the present invention, the locking body 12 engages with the lock hole 10 of the first slide plate at the moment the door 1 is opened, and the lock receiving plate 11 engages with the lock hole 10 of the first slide plate when the door is closed. In order to maintain the engaged state until it is pressed, the handle shaft 4, which is interlocked with the first slide plate 6, is prevented from rotating while the door is open, and the switch 7 cannot be operated.

In other words, while the door 1 is open, the power supply circuit to devices such as switchboards and facilities is always cut off, and the power supply will not be restarted unless the door 1 is properly closed. It has a very good effect.

[Brief explanation of the drawing]

The drawings show an interlock device according to an embodiment of the present invention; FIG. 1 is a front view of the interlock device with the door closed and locked, and FIG. 2 is a right side view of the interlock device with the door closed and locked. , FIG. 3 is a rear view of the interlock device with the door closed, FIG. 4 is a sectional view taken along line A-A' in FIG. 3, and FIG. 5 is a sectional view taken along line B-B' in FIG. 4. .
Fig. 6 is a cutaway rear view of the main part of the interlock device when the handle shaft is turned 60 degrees in the unlocking direction and the door is pulled in the opening direction, and Fig. 7 is a cutaway rear view of the main part of the interlock device.
It is a sectional view taken along the line C′. Fig. 8 is a perspective view of the lock receiving plate used in the interlock device, Fig. 9 is a rear view of the first slide plate used in the interlock device, and Fig. 10 is a perspective view of the lock receiving plate used in the interlock device. FIG. 11 is a perspective view of the slide plate and a guide block used in the interlock device. FIG. 12 is a longitudinal sectional view of the interlock device when the handle shaft is turned 60 degrees in the unlocking direction but the door is not pulled in the opening direction. FIG. 13 is a right side view of the first slide plate. 1...Door, 2...Handle device, 3...Socket body, 4...Handle shaft, 5...Key, 6...First slide plate, 7...Switch, 8...Second slide plate, 9...Fixed frame body, 10...Lock hole, 11...
... Lock receiving plate, 12 ... Lock stopper body, 13 ... Lock stopper piece, 14 ... Reception hole.

Claims (1)

[Scope of utility model registration request] A handle device 2 attached to the door 1 side; a key 5 for unlocking the handle shaft 4 to the catch body 3;
A first slide plate 6 interlocked with the handle shaft 4
A switch 7 built into a power supply circuit to devices and facilities such as a switchboard; and a second slide plate 8 for operating the switch 7, which is interlocked with the first slide plate 6.
; mounted on the fixed frame 9 side, and the first slide plate 6
a lock receiving plate 11 that is removable from a lock hole 10 formed in the lock; a locking body 12 that is biased toward the first slide plate 6 and that is removable from the lock hole 10 from the opposite side of the lock receiving plate 11; The first slide plate 6 has a locking protrusion 13 continuous to the lock hole 10.
The interlock device is provided with a receiving hole 14 in the lock receiving plate 11 through which the locking protrusion 13 can be engaged and detached.