JPS6338646Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a distribution board for opening and closing electric circuits of electrical equipment, and particularly relates to a locking mechanism between the outer frame door and the panel frame of a double door type panel.

[Technical background of the invention]

Figure 1 shows a conventional distribution board (hereinafter simply referred to as the board).
FIG. This shows the state behind one of the inner doors with it half open, board frame 1,
Left outer frame door 2, right outer frame door 3, left middle door 4, right middle door 5,
It consists of a female screw 6, an opening/closing handle 7, and a cable breaker (MCCB) 8.

FIG. 2 is a cross-sectional view of the panel shown in FIG. 1 taken along the line A-A, showing the structure of the double doors and the internal structure of the panel. The panel frame 1 is constructed by assembling steel plates and shaped steel materials adapted to the size of the panel, and has a left outer frame door 2 and a right outer frame 3 on the front side thereof, which are rotatable with hinges 2a and 3a, respectively. I am wearing it. The opposite side of the outer frame doors 2 and 3 from the hinge, that is, the joint portion of both doors is fixed with a set screw 6 to a screw receiver 9 provided on the panel frame.

The inner doors 4 and 5 are rotatably attached to the aforementioned outer frame doors 2 and 3 via hinges 4a and 5a, respectively, and can be opened and closed by an opening/closing handle 7 that is linked to a locking mechanism (not shown). There is.

The double doors are used such that the inner doors 4 and 5 are used for normal operation, and the outer frame doors 2 and 3 are used for maintenance and inspection when the operation is stopped.

As shown in Figure 2, there are conductors 1 that make up the electrical circuit inside the panel.
0 is stretched over one side by the support insulator 11 and its support metal fittings 12, and one end is connected to the terminal section of the MCCB8, so there is no risk of touching exposed live parts whenever the door is opened during operation. Random. Therefore, for the outer frame doors 2 and 3, which are always fixed, a notch is provided only in the operating handle of the MCCB8 to expose it to the door surface, and the other parts are made to cover the entire surface of the door so that one finger cannot be inserted into the panel. Protective covers 13 and 14 are provided to ensure safety when operating the MCCB8. The inner doors 4 and 5 are opened and closed by the opening/closing handle 7 only when it is necessary to operate the MCCB 8, and otherwise they are kept closed to prevent accidental operation by anyone other than those involved in the operation.

In addition, in case of maintenance inspection inside the panel when the operation is stopped, first open the inner doors 4 and 5 and remove all MCCB8.
Turn it OFF, then remove the set screw 6 and open the outer frame doors 2 and 3 so that you can see through the entire interior.

[Problems with background technology]

However, the above door configuration has the following drawbacks.

(1) The outer frame doors 2 and 3 are not mechanically interlocked with the inner doors 4 and 5, and can be opened and closed by simply removing the set screw 6, without opening the inner doors 4 and 5 and operating the MCCB. Therefore, if the person involved incorrectly follows the handling procedure, there is a possibility that the user may come into contact with the live parts, so it cannot be said that this is a perfect safety measure.

(2) Since a plurality of female screws 6 are exposed on the surface of the panel, the external appearance is poor, and when the female screws 6 are attached or removed, the paint film tends to peel off, making repair painting unavoidable.

(3) Since a plurality of screw receivers 9 for the female screws 6 are provided inside, machining the screw holes and adjusting the alignment with the door is difficult and time-consuming.

[Purpose of invention]

This invention has a locking mechanism between the outer frame door and the panel frame that links the opening and closing of the outer frame door and the inner door, resulting in a double door panel that improves safety, improves appearance, and reduces processing and adjustment man-hours. The purpose is to provide.

[Summary of the idea]

For this reason, the present invention provides a plurality of locking mechanisms on the surface of the outer frame door in a position that is normally hidden by the inner door, and engages the locking pins with the panel frame to lock the locking mechanism that cannot be operated unless the inner door is opened. It has a mechanical structure and is characterized by the complete elimination of internal screws on the exterior surface.

[Example of the invention]

Hereinafter, the present invention will be explained with reference to an embodiment shown in FIGS. 3 to 5. FIG. 3 is an external perspective view of the board according to the present invention, and corresponds to FIG. 1 of the conventional board. A locking pin through hole 20 and a locking mechanism 21 are provided on the upper and lower surfaces of the outer frame doors 2 and 3 to connect to the panel frame.

4a and 4b are external perspective views of the locking mechanism 21 according to the present invention, with FIG. 4a showing the locked state when the door is attached, and FIG. 4b showing the unlocked state. The locking mechanism consists of a main body 21, a locking pin 22, and an arm 23. The main body 21 is provided with guide holes 21a, 21b for the arm 23, a mounting hole 21C, and a sliding hole 21d for the locking pin 22. The locking pin 22 is inserted into the sliding hole 21d.
The arm 23 has an outer diameter that can be easily slid against the inner diameter with a suitable clearance, and an arm 23 for rotating 90 degrees in the vertical and horizontal directions is fixed approximately in the center by screwing or welding. ing. To hold the locking pin 22 in the locked state, the arm 23 is rotated and engaged with the guide hole 21b so that it is parallel to the mounting surface, but when unlocking, the arm 23 is rotated 90 degrees counterclockwise so that it is perpendicular to the mounting surface. Rotate. The thickness t of the locking mechanism main body 21 is of course smaller than the folded thickness of the inner door. On the other hand, the protruding dimension l of the arm 23 is larger than the bending thickness of the inner door, and the reason is to prevent forgetting to lock the door.

Figure 5 a, b and Figure 6 a, b show the locking mechanism 2.
1 is a vertical sectional view showing various states from wearing the device to locking and unlocking the device. The explanation will be given below in order. FIG. 5a shows the locked state. A locking mechanism 2 located inside the inner doors 4 and 5 and attached to the surface of the outer frame doors 2 and 3.
The locking pin 22 of 1 is inserted into the pin through hole 2 of the outer frame door 2, 3.
0 and engages with a pin receiver 24 provided on the panel frame 1, and the arm 23 is parallel to the door surface.

That is, the panel frame 1 and the outer frame doors 2 and 3 are in a locked state. FIG. 5b shows that the inner doors 4 and 5 are opened, the arm 23 is directed perpendicular to the door surface, and is lowered downward.
A state in which the locking pin 22 is removed from the pin receiver 24, that is, an unlocked state is shown.

FIG. 6a shows a state in which the outer frame doors 2 and 3 are opened by unlocking as shown in FIG. 5b.

In this case, although not shown, it goes without saying that the inner door is open.

FIG. 6b is an explanation of the above-mentioned locking prevention measure.
If the locking pin 22 is in the unlocked position even when the outer frame doors 2 and 3 are closed, the protruding dimension l of the right angle arm 23 from the door surface is larger than the bending dimension h of the inner doors 4 and 5, that is, l>h. Because the inner doors 4 and 5 do not close completely, the panel frame l
In contrast, it can be easily found that the outer frame doors 2 and 3 are unlocked. This locking mechanism 21 does not require any complicated link mechanism, so it is easy to install and can easily be modified to an existing panel. Further, the female screw 6 for the outer frame door on the outside of the panel is not required, and the appearance is improved.
In addition, in FIG. 5, a notch 25 is provided at the upper part of the inner doors 3, 4, which is slightly larger than the thickness t of the locking mechanism 21, to prevent the inner doors 3, 4 from colliding with each other when they are "closed".

In the above-mentioned embodiment, the locking mechanism operates by sliding up and down, but it may also be rotated by a cam. Furthermore, a structure may be adopted in which a key can be attached to fix the arm 23 so that the outer frame door cannot be opened during operation due to safety concerns.

[Effect of idea]

As described above, according to the present invention, the safety of the double door function can be improved by locking the panel frame and the outer frame door, which are linked to the opening and closing of the inner door, without using any complicated link mechanism. The appearance is improved by eliminating the female screw, and the processability is also improved by eliminating the need to adjust the alignment of multiple holes. It also allows for easy modification of existing facilities.

[Brief explanation of the drawing]

Figure 1 is an external perspective view of a conventional mold plate, and Figure 2 is a perspective view of a conventional mold plate.
3 is an external perspective view of the panel showing an embodiment of the present invention; FIG. 4a is a perspective view showing the locking shape of the locking mechanism of the present invention;
Figure b is a perspective view showing the unlocked shape, Figure 5 a is a vertical sectional view showing the locked state between the panel frame and the outer frame door,
Fig. 5b is a vertical sectional view showing a state in which the inner door is opened and the space between the outer frame doors of the panel frame is unlocked, and Fig. 6a is a longitudinal sectional view showing a state in which the outer frame door is opened compared to Fig. 5b. , 6th
Figure b is a state explanatory diagram when the inner door is closed in the unlocked state. 1... Panel frame, 2, 3... Outer frame door, 4, 5
...Inner door, 6...Female screw, 8...MCCB, 2
0...Lock pin through hole, 21...Lock mechanism main body,
21a, 21b...Guide hole, 22...Lock pin,
23...Arm, 24...Lock pin holder.

Claims (1)

[Scope of utility model registration request] In distribution boards that have double doors and require locking between the panel frame and the outer frame door, the outer frame door surface is usually hidden by the middle door, and the door is penetrated through the door and placed on the panel frame. A locking mechanism that engages with a pin is installed in the perforation of the frame, and the engagement of the pin is unlocked only when the inner door is opened, making it possible to open and close the outer frame door. A locking mechanism for a distribution board characterized by the fact that the pin operating arm touches the inner door and prevents the inner door from closing.