JP2537024Y2 - Door lock device for switchboard - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door lock device for a switchboard in which one control unit is arranged in a row.

[0002]

2. Description of the Related Art Recently, demands for safety have been stricter in pursuit of manufacturer responsibility, and a door lock that prevents a door from being opened when a low-voltage switchboard is in a live state. Devices have come to be provided.

FIG. 4 is a front view of a row-panel configuration in which a so-called one control unit, which is drawn from the same power supply, is composed of three distribution boards 1A, 2A, and 3A. Single-line connection diagrams for explaining the functions are superposed. It is drawn. The switchboard 1A is provided with an input power circuit breaker MCCB1, and power is drawn into the other switchboards 2A and 3A via the input power circuit breaker MCCB1 to form branch circuit breakers 51, 52, 53 and branch circuits. Connected to the electromagnetic switch 54.

[0004] In the drawing, H is an opening / closing operation handle provided on the door of each switchboard.

[0005] The above-mentioned doors of the switchboards 1A to 3A can be opened and closed independently of the input power circuit breaker MCCB1 regardless of turning on and off.
Therefore, there is a danger that the door may be opened when the input power circuit breaker MCCB1 is turned on, or the input power circuit breaker MCCB1 may be turned on while the door is open and a person may come into contact with the exposed charging section. It is.

FIG. 5 shows an external handle MH operated with a mechanical locking mechanism between a housing and a door of a distribution board which is commercially available for each panel in order to prevent a risk of human contact with the exposed charging section. Input power circuit breakers MCCB1 to MCCB3 are provided, and the switchboards are 1a, 2a, and 3a. The input power circuit breakers MCCB1 to MCCB3 provided for each switchboard can be turned on or off by operating an external handle only when the switchboard door is closed. When any of the switches MCCB1 to MCCB3 is turned on, the door of the switchboard on which the circuit breaker MCCB is provided cannot be opened. Since the input power circuit breaker MCCB cannot be turned on, the safety problem that a person comes into contact with the exposed charged part is solved.

[0007]

Although the above-described switchboard shown in FIG. 5 employs the above-described switchboard, the safety problem of human contact with the exposed charging section can be solved. However, each switchboard requires an expensive switchboard. An external handle MH-operated circuit breaker MCCB with a locking mechanism between the housing and the door must be mounted as an input power MCCB, which not only reduces the competitiveness in the market by making the switchboard expensive, but also increases the size. Requires mounting space.

The present invention has been made in view of the above points, and has as its object to secure the safety of a switchboard economically by using a simple and inexpensive switchboard door locking device with a reduced number of parts used. And

[0009]

Means for solving the above-mentioned problems in the present invention are as follows. An input power circuit breaker is turned on / off by an operation handle provided outside a switchboard.
It consists of a main switchboard that can open the door only when the circuit breaker is shut off, and a switchboard that is configured with the main switchboard and a side panel and draws power from the input power circuit breaker, and is adjacent to these side panels. A through hole communicating with each other is provided on the side wall of the adjacent housing of the switchboard, a push rod that is slidable in one of the housings and is capable of appearing and retracting in the through hole is provided, and a door of another adjacent housing is provided. Provided a locking device with a release lever,
When the release lever is pressed by the push rod, the lock device is unlocked so that the doors are sequentially opened from the main switchboard, and the doors of the adjacent switchboards are unlocked before opening.

A main switchboard capable of opening and closing an input power circuit breaker with an operation handle provided outside the switchboard and opening the door only when the circuit breaker is shut off, and a main switchboard. In a door lock device for a switchboard comprising a switchboard configured to draw power from the input power circuit breaker, a through-hole communicating with a side wall of an adjacent housing of the switchboard adjacent to the row boards is provided. And a slidable cam-equipped rod disposed on the front side in one of the housings and capable of coming and going in and out of the through-hole. The cam-operated rod is mounted on a cam case provided on the front side in the one housing, and is urged toward the adjacent housing by a spring. Protruding from the side The cam operating rod is supported by a case provided on the front side in the other housing, and is connected to the operating rod vertically supported by the case and the bell by a bell crank. When the rod is pressed by the rod with a cam, the operating rod is protruded toward the door, and further, the door of the one switchboard prevents the movement of the cam when the door is closed, and the door is opened and the cam is opened. When the attached rod moves to the adjacent switchboard side, a protruding portion with which the tip of the cam abuts is provided so that the input power circuit breaker of the main switchboard cannot be turned on unless all the doors of the row board are closed.

[0011]

In the switchboard having the row board configuration, the input power circuit breaker of the main switchboard is shut off, the door is opened, and the lock of the door of the adjacent second switchboard is unlocked from the inside. The door lock of the third switchboard adjacent to is unlocked from the inside by opening the door of the second switchboard. Therefore, the door of each switchboard can be opened only when the input power circuit breaker is shut off, which is extremely safe for maintenance and inspection.

In another embodiment, when the door of the adjacent switchboard is open, the tip of the rod with a cam on the main switchboard moves into the adjacent switchboard. Of the main switchboard cannot be closed because the tip of the main switchboard contacts the protruding part of the door. When the door of the switchboard on the adjacent side closes and the rod with cam moves to the original position, the tip of the cam comes off contact with the protrusion of the door, and the door can be closed. Therefore, since the door of the main switchboard cannot be closed unless the door of the adjacent switchboard is closed, the input power circuit breaker of the main switchboard cannot be turned on, which is extremely safe for maintenance and inspection.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a power distribution board of a side-panel arrangement, which draws power from the same input power supply and supplies power, has an arbitrary power distribution board (hereinafter referred to as a main power distribution board) provided with an input power circuit breaker. An interlock is provided so that the door can be opened only when the circuit breaker is shut off, and an input power circuit breaker is not provided on another switchboard adjacent to the main switchboard (hereinafter referred to as a second switchboard). In addition, it can be opened only when the door of the main switchboard is opened (the input power circuit breaker is cut off) to ensure safety during maintenance and inspection and to omit parts.

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention. FIG. 1A is a state in which a door of a main switchboard is closed, and FIG.
Indicates an open state. In these figures, 1, 2
Is a main switchboard and a second switchboard, respectively. The main switchboard 1 and the second switchboard 2 have housings 3 and 13 and doors 4 and 14, respectively, and the front faces of the doors are arranged so as to be in contact with each other on a line. And constitute a train. 5 and 15 are housings 3 and 1
3 shows a mounting member for mounting a push rod 6 and a push rod 7 provided on opposing side walls 3 of FIG. The push rod 6 is attached to the mounting member 5 and is slidable on the bearing 8 and provided so as to be prevented from falling off by a retaining pin. The push rod 7 is slidable on the mounting bracket 9 mounted on the mounting member 15. The push rod 6 and the push rod 7 are provided so as not to come off.
Means that one end thereof is arranged in a straight line through a through hole 10 provided in a side wall where the housings 3 and 13 are in contact with each other. 1
Reference numeral 6 denotes a lock device (snatch lock) having a release lever 17, which is locked with a receiver 19 provided on a receiver mount 18 provided on the door 14 of the second switchboard 2. This lock is door 1
Automatically done when 4 is completely closed. Release lever 1
7 is provided on the other end side of the push rod 7, and when the push rod 6 is pushed rightward in FIG.
7 is pushed, the release lever 17 is tilted as shown in FIG. 1B, and the snatch lock between the engagement claw 20 and the receiving metal 19 is released. The push rod 6 cannot be operated unless the door 4 of the main switchboard 1 is opened, and the door 4 cannot be opened unless the input power circuit breaker MCCB1 in FIG. When the door 14 is opened, the power is always turned off. Therefore, each switchboard can be maintained and inspected in a safe state at all times. FIG. 2 is a cross-sectional view of a main part showing another embodiment of the present invention. In addition to the above-described embodiment, the input power circuit breaker cannot be turned on unless all the switchboards of the row panel configuration close the door. Things.

FIG. 2A shows a state where the doors of the main switchboard 1 and the second switchboard 2 are closed, and FIG. 2B shows a state where both doors can be opened. The parts having the same names or the same functions as those in FIG.

In these figures, reference numeral 27 denotes a case fixed to the housing 13, and 28 denotes an operation rod abutting on a metal holder 29 fixed to the door 14 provided through the case 27. Is opened and closed by the opening and closing of the case 27.
Reference numeral 30 denotes a snap ring for restricting the operation of the operation rod 28. 31 is provided through the case 27,
And a cam operating rod urged by a spring 32 extending between the operating rod 28 and a bell crank 34 that rotates about a shaft 33 fixed to the case 27. The cam operation unit 35 is constituted by 27 to 34 described above.

Reference numeral 36 denotes a protruding portion fixed to the door 4 of the main switchboard, and 37 denotes a cam protruding toward the door 4. The cam reciprocates in a cam case 38 fixed to the housing 3 and contacts the protruding portion 36. To prevent the door 4 from closing. Reference numeral 39 denotes a cam-equipped rod on which a cam 37 is mounted, which is operated by a cam operation rod 31 abutting at a boundary surface 40 between the boards against tension of a spring 41 stretched between the rod and the mounting member 5. . 36 to above
The cam part 42 is constituted by 41.

Next, the operation will be described.
When the door 14 is open, the operating rod 28 can project forward as shown in FIG.
Since the cam operating rod 31 connected by the bell crank 34 is moved by being pulled to the right in the drawing by the spring 32, the rod 3 with the cam that is pulled by the spring 41 is moved.
The cam 9 and the cam 37 also move rightward in the cam case 38. Therefore, when the door 4 is to be closed, the projection 3 fixed to the door 4
6 cannot be closed by hitting the protrusion of the cam 37.

When the door 14 is closed, the operating rod 28
4, is pushed into the case 27 by the metal clasp 29, and pushes the cam operating rod 31 through the bell crank 34 to the left in the drawing against the tension of the spring 32, and the cam 41 is pulled by the spring 41. Since the rod 39 is pushed, the cam 37 moves to the left in the cam case 38, and the protrusion 36 fixed to the door 4 does not contact the protrusion of the cam 37, so that the door 4 is closed as shown in FIG. Can be. Note that the input power circuit breaker of the main switchboard 1 is performed by an external handle MH with a mechanical locking mechanism as shown in FIG. 3, and the switchboards other than the main switchboard after closing the door as shown in FIG. The lock cannot be opened unless the lock is removed from the inside of the adjacent switchboard. The locking device in this case does not necessarily need to use the one shown in FIG. 1, and it is sufficient that the locking device can be manually unlocked from within the panel.

FIG. 3 is a front view of a switchboard showing an application example of the door lock device according to the present invention. In order to show the function of each switchboard, single-line connections are drawn in an overlapping manner. 4 and 5 are denoted by the same reference numerals and description thereof is omitted.

FIG. 3A shows an input power circuit breaker MCCB.
The main switchboard 1b provided with 1 is disposed at the left end, and one control unit is constituted by a total of three switchboards of the other switchboards 2b and 3b. In the case where a door locking device including a cam portion 42 and a cam operating portion 35 is provided above an adjacent joint of each switchboard, and the door locking device shown in FIG. Is shown. 1 and 2 are given the same reference numerals. The door of the switchboard 2b cannot be closed unless the door of the switchboard 3b is closed by the upper door locking device, and the door of the switchboard 1b cannot be closed unless the door of the switchboard 2b is closed. The input power circuit breaker MCCB1 cannot be turned on unless the door of the switchboard 1b is closed.

When the door is opened, the input power circuit breaker MCCB1 is shut off, the door of the switchboard 1b is opened, and the locking device 16 of the adjacent switchboard 2b is opened unless the door of the switchboard 2b is opened. Therefore, unless the door of the switchboard 2b is opened and the release mechanism is operated, the lock is unlocked so that the door of the switchboard 3b cannot be opened.

FIG. 3B shows an example in which an input power circuit breaker MCCB1 is provided on a switchboard 2c located at the center of three switchboards constituting one control unit. The door lock device provided on the upper part of the connection part of each switchboard is operated such that the two cam parts provided on the switchboard 2c are operated by the operating parts provided on the switchboards 1c and 3c adjacent to both sides of the switchboard 2c. A lock device 16 is provided near the center of the junction of the switchboards so as to open the door of the switchboard 2c to perform the release operation.

Therefore, similarly to FIG. 3A, the input power circuit breaker MCCB1 which cannot be turned on unless the door is closed.
Switchboard 1c adjacent to both sides of main switchboard 2c provided with
Unless the doors 3c and 3c are closed, the door of the switchboard 2c cannot be closed, and the input power circuit breaker MCCB1, which cannot be shut off unless the door is closed, is shut off and the door of the switchboard 2c is opened. Unless the release mechanism is operated, the doors of the switchboards 1c and 3c adjacent on both sides cannot be opened by unlocking the lock.

As described above, the input power circuit breaker MCCB1 cannot be turned on unless the doors of all the switchboards constituting one control unit sharing the input power circuit breaker are closed. Further, the door of any panel shuts off the input power circuit breaker MCCB1 and the input power circuit breaker MCC1.
Since it cannot be opened until after the door of the switchboard provided with B1 is opened, it is possible to completely prevent an accident such as an electric shock caused by a person touching the exposed charged part.

In the above description, as a circuit breaker for input power to a plurality of switchboards constituting one control unit, a mechanical locking mechanism between a housing and a door of a commercially available expensive switchboard. The case where a mold-type rotary breaker with an external handle is used is described, but this breaker must be a circuit breaker that cannot be turned on or closed unless the door of the switchboard on which the breaker is installed is closed. Any type of circuit breaker may be used.

Although the application example has been described with reference to a three-sided row board, the present invention can be applied to a multi-sided row board and an input power supply panel at any position in a multi-sided row board. can do.

[0028]

As described above, the switchboard door lock device according to the present invention is a lock device having a simple mechanism. If the door of another adjacent switchboard is not closed, the door of the switchboard is closed. Can be closed, and the doors of other adjacent switchboards can only be opened after the doors of the switchboard have been opened. When adopting a circuit breaker that can be turned on and off only when the door is closed or a switch that can be opened and closed on the input power panel of the row panel, Alternatively, it is possible to completely prevent an accident such as an electric shock caused by a person coming into contact with a charged part exposed by opening the door.

Further, since the door lock device of the switchboard according to the present invention is separated at the boundary between the switchboards, it is easy to handle the switchboard by dividing the switchboard into one unit, for example, to adjust connection after installation. Various practical effects such as no troublesome work are required.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of an embodiment of the present invention, wherein FIG.

FIGS. 2A and 2B are cross-sectional views of a main part of another embodiment of the present invention, wherein FIG. 2A shows a state in which the door is prevented from being closed, and FIG. 2B shows a state in which the door is unlocked;

FIG. 3 is a front view of a switchboard showing an application example of the present invention,
(A) shows an application example of the present invention, and (B) shows another application example of the present invention.

FIG. 4 is a front view of a conventional switchboard.

FIG. 5 is a front view of another conventional switchboard obtained by improving the switchboard shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main switchboard 2 ... Second switchboard 3, 13 ... Housing 4, 14 ... Door 5, 15 ... Mounting member 6 ... Push rod 7 ... Push rod 9 ... Mounting bracket 10 ... Through hole 16 ... Locking device 17 ... Release Lever 18 ... Receiver mounting base 19 ... Receiver 27 ... Case 28 ... Operation rod 30 ... Snap ring 31 ... Cam operation rod 32,41 ... Spring 33 ... Shaft 34 ... Bell crank 35 ... Cam operation part 36 ... Protruding part 37 ... Cam 38 ... Cam case 39 ... Rod with cam 40 ... Boundary surface between switchboards 42 ... Cam part MCCB ... Circuit breaker for input power

Claims (2)

(57) [Scope of request for utility model registration] A main switchboard capable of opening and closing an input power circuit breaker with an operation handle provided outside the switchboard and opening a door only when the circuit breaker is shut off, and a main switchboard. And a power distribution board configured to draw power from the input power circuit breaker, and a through hole communicating with each other is provided on a side wall of an adjacent housing of a power distribution board adjacent to each other in the power board, and a through hole is provided in one of the housings. A push rod slidable in the through hole is provided, and a lock device having a release lever is provided on a door of another adjacent housing, and when the release lever is pressed by the push rod, A door lock device for a switchboard, wherein the lock device is unlocked. 2. A main switchboard capable of opening and closing an input power circuit breaker with an operation handle provided outside the switchboard and opening a door only when the circuit breaker is shut off, and a main switchboard. In a door lock device for a switchboard comprising a switchboard configured to draw power from the input power circuit breaker, a through-hole communicating with a side wall of an adjacent housing of the switchboard adjacent to the row boards is provided. And a slidable cam-equipped rod disposed on the front side in one of the housings and capable of coming and going in and out of the through-hole. A cam operating rod that moves along with the cam is disposed, and the rod with cam is supported by a cam case provided on the front side in the one housing and is constantly urged to the adjacent housing by a spring. Has a cam that protrudes from the door. The cam operation rod is supported by a case provided on the front side in the other housing, and is connected to the case by a bell crank and an operation rod supported in a direction perpendicular to the cam operation rod. When the cam operation rod is pressed by the rod with the cam, the operation rod is made to protrude toward the door, and further, the door of the one switchboard prevents the movement of the cam when the door is closed, and the door is closed. A door lock device for a switchboard, wherein a protrusion is provided to which the tip of the cam comes into contact when the rod with the cam is moved to the adjacent switchboard side when opened.