JPH08242512A - Device for locking control center unit - Google Patents

Abstract

PURPOSE: To provide a device for locking a control center unit in which a unit door is not closed when the position of a unit is not a position to be fixed and the unit does not move when it is in operation. CONSTITUTION: An operating piece 4A is provided so as to be directly connected to the operation side end of a locking shaft 34A, and the plate-like knob part 4A1 of the operating piece 4A is made large on one side with respect to the rotary shaft 340 of the locking shaft 34A and disposed in the position to be horizontal at the time of LOCK. On the other hand, turn-up part 121 in which the part brought into contact with the guide rail frame 26 of a unit door 12A is turned up and a notch part 122 in which the part hit upon the knob part 4A1 in the position LOCK of the turn-up part 121 is cut are provided. Therefore, the knob part 4A1 is not hit upon the turn-up part 121 in the position LOCK and the unit door 12A can be closed and however, since the position of the knob part 4A1 is different from that at the time of LOCK in the position TEST and the position D.OUT and it is hit upon the turn-up part 121, the unit door 12A can not be closed, and accordingly, the locking device is not brought into the operating state as it is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control center in which a plurality of unitized units of a starting circuit of a low-voltage electric motor are assembled and housed, and a unit as a unit is housed in the control center. The present invention relates to a locking device for fixing the position of the locking device, and particularly to an interlock mechanism with a unit door that covers the front surface of the unit of the locking device.

[0002]

2. Description of the Related Art FIG. 7 is a two-sided view of a control center.
(A) is a front view and (a) is a side view. In this figure, a horizontal busbar 13 common to the row board is provided inside a busbar room door 11 provided at the upper part of the control center and electrically connected to a vertical busbar 14 provided substantially at the center of the control center. It is connected to the. The horizontal bus bar is electrically connected to a plurality of other control centers arranged side by side in the illustrated one control center.

On the front side of the control center, there are provided a bus room and its door 11 at the uppermost part, and a storage room for eight vertically stacked units and a unit door 12 therebelow, each of which is described later. Has a structure in which it can be freely taken in and out, and the unit door 12 is closed and covered. The unit table 1 is placed under each storage area so that the unit 2 can be easily taken in and out.
5 is provided and the unit 2 is stored on the unit table 15. The unit door 12 is provided with two rectangular windows so that the breaker 21 and the display panel 22 of the stored unit can be operated or visually recognized from the outside. As described above, the unit table 15 is provided in the storage chamber in each unit door 12 so that the unit can be easily taken in and out and the position can be fixed.

FIG. 8 is a plan view of the unit, and FIG. 9 is a front view. The unit 2 has a power plug 23 for electrically connecting with the vertical bus bar 14, a load plug 24 for connecting with a load terminal not shown in FIGS. 7 and 8, and a guide for facilitating the loading and unloading of the unit 2. The rail frame 26, a mounting plate 25 for mounting equipment, and a position locking device 3 for determining and fixing the installation position of the unit 2 are configured. A breaker 21 and a display panel 22 such as an indicator ammeter and a lamp are provided on the front side, and as described above, even after the unit door 12 is closed, the unit door 12 is exposed to the outside through a window provided therein. .

The locking device 3, as shown in the plan view of FIG.
It is provided in the lower part of the center and is operated by inserting a flat-blade screwdriver through an operation hole 31 provided in the guide rail frame 26 shown in FIG. As will be described later, the locking device 3 fixes the unit 2 to the unit table 15 by the above-described operation, and can select a movable state such as withdrawal and insertion as necessary.

FIG. 10 is a plan view of the position locking device of FIG. 8, and FIG. 11 is a side view thereof. In these figures, the left side of the U-shaped locking device frame 30 is fixed to the guide rail frame 26 by a rivet (not shown). A locking plate 33 and a leaf spring 32 are provided between the locking device frames 30, and a locking shaft 34 made of a square rod passes through them, and the right end of the drawing is locked via a stop plate 35. It is attached to the device frame 30. The stop plate 35 is fixed to the locking plate 33 by a rivet shown by a chain line.

FIG. 12 is an exploded view of the locking device 3 of FIGS. In this figure, a rivet is inserted and fixed to two small holes, which are not designated by a stopper plate 35, on the inner surface of the right side vertical portion of the locking device frame 30 in the figure. The outer surface of the left vertical portion is fixed to the guide rail frame 26 with rivets (not shown) as described above. The locking shaft 34 passes through the square through holes 334 on both sides of the locking plate 33, and the right end portion thereof is inserted into the through hole 351 of the stop plate 35. The left end of the locking shaft 34 penetrates the through hole 321 of the spring 32, and then the locking device frame 3
0 through hole 304. Through holes 304, 32
Reference numerals 1 and 351 are circular shapes with which the corners of the lock shaft 34 come into contact with each other, so that the lock shaft 34 may be rotated. Since the two through holes 334 of the lock plate 33 are square, the lock plate 33 rotates together with the lock shaft 34. The right end of the locking shaft 34 is positioned by hitting the right vertical portion of the locking device frame 30, and the left end is positioned by hitting the guide rail frame 26, and movement in the axial direction is restricted. Since the diameter of the through hole 31 provided in the guide rail frame 26 is smaller than that of the through hole 304, the locking shaft 34 does not protrude to the left side from the through hole 31. At the left end of the locking shaft 34, an operation groove 341 having an arrow shape as shown in the figure.
The operation groove 341 can be visually recognized from the through hole 31 and an operation can be performed by inserting a minus driver and rotating the operation groove 341 as described later. The spring 32 is for stabilizing its position by fixing its position every 90 ° rotation when the operation groove 341 rotates.

A slit 301 is provided in the locking device frame 30. In this slit 301, locking claws 331 and 332 provided at the right end of the locking plate 33 in the figure are provided.
It goes in and out according to the rotation angle of 4. FIG. 13 is a partial plan view of the unit table 15, and the related members are shown by a chain double-dashed line. In this figure, the unit table 15 is provided with U-shaped notches 151, and narrow locking slits 152, 153 protruding to the lower side of the figure at both ends thereof are provided. Lock slit 15
2 and the right end of the cutout 151 are the slits 301 in FIG.
Matches

The locking claws 331 and 3 are common to FIGS. 10 to 13.
The position of 32 is the same in the drawing, and the locking claw 331 faces downward and is inserted into the locking slit 152 through the slit 301, and the locking claw 332 faces sideways and is inserted into the notch 151. There is no state. Since the locking claw 331 is inserted in the locking slit 152, the unit 2 is fixed at this position, and the “LOCK” at the operating position described later.
It is a state of.

FIG. 14 is a partial front view mainly showing the shape of the right end portion of the locking plate 33 in FIG. 12, and a member long to the front is shown in a sectional view. In this figure, although it overlaps with the above,
Two protrusions are provided on the end of the locking plate 33 opposite to the side where the unit door 12 is located. These are the above-mentioned locking claws 331 and 332, and the slits provided in the locking device frame 30. It is in a state of being inserted into 301 and the lock slit 152.

FIG. 15 shows an operation hole 31 of the guide rail frame 26.
It is a partial front view of the part in which is provided. Operation hole 31
From the arrow-shaped operation groove 34 provided on the lock shaft 34
1 is visible. Then, when the arrow of the operation groove 341 is directed to the “LOCK” direction as shown in the figure, the unit 2 is in the position of the locking claws 331 and 332 in FIG. 14, that is, the unit 2 is in the fixed state. Represents time. The position where the locking claw 331 is inserted into the locking slit 152 is the operating position as described above, and the position where the locking claw 331 is inserted into the locking slit 153 is that the unit 2 is pulled out and the power plug 23 and the load plug 24 are It is a state in which the unit 2 is fixed so that it can be tested apart from the bus bar and the load terminal.

The arrow of the operation groove 341 is directed upward and "TEST"
14 indicates that the locking claws 331 and 332 are not shown in FIG.
Since it is located at a position rotated 90 ° counterclockwise from the state of FIG.
Further, the lock claw 332 is located at a position where the lock claw 332 faces downward and is inserted into the notch 151. Locking claw 3
Since 32 is not fitted in the lock slits 152 and 153, the unit 2 can be moved by the left and right dimensions of the cutout 151 in FIG. Therefore, when the lock claw 331 is inserted into the lock slit 152 at the time of “LOCK” and the arrow is set to “TEST”, the lock claw 331 can be pulled out to the position of the lock slit 153. After this, when the arrow is returned to the "LOCK" position again, the locking claw 331 fits in the locking slit 152 and the unit 2 is fixed at the test position.

When the arrow points to "D.OUT", the locking claws 331 and 332 are rotated 180 ° in the counterclockwise direction from the state of FIG. 14, so that the locking claw 331 moves upward. Since the locking claws 332 face the right side and are located out of the notches 151 and the locking slits 152 and 153, the movement of the unit 2 is not restricted at all.
It is possible to put in and take out. It should be noted that it is impossible to rotate the locking shaft 34 in the clockwise direction from the state of FIG. 14 because the hatched portion of the locking plate 33 is an obstacle. In addition, there is no need for practical use.

[0014]

In the locking device described above, the direction of the arrow is changed to "LOC" by operating the operation groove 341.
It can be set arbitrarily in three positions of "K", "TEST", and "D.OUT". For that reason, it is possible that the position is not the “LOCK” position but the other position during the normal operation. If the unit 2 is not locked by mistake at the “LOCK” position during operation, the unit 2 may move in the front-back direction, at which time the contact of the power plug 23, the load plug 24, etc. becomes unstable and contact wear may occur. Problems arise, such as an increase and the risk of local overheating.

An object of the present invention is to solve such a problem and to prevent the unit door from being closed unless it is in the "LOCK" position, so that the control center unit can be operated only at the "LOCK" position. To provide a locking device for the same.

[0016]

In order to solve the above problems, according to the present invention, each unit of the control center in which the units are housed in a plurality of unit tables and the unit doors are closed is 90 ° of the locking shaft. Fixed to the driving or test position (“LOCK”), movable between the operating position and the test position (“TEST”), and free to put in and out (“D.OUT”) according to different predetermined angular positions. One of two states is selected by operating from the outside.In the locking device of the control center unit, the operation piece for rotating the locking shaft is fixedly provided at the operation side end of the locking shaft. Shall be equipped with an interlock mechanism that can close the unit door only when is in the "LOCK" position. In addition, the interlock mechanism is arranged such that one of the plate-shaped knobs of the operation piece is formed to be large with respect to the rotation axis of the lock shaft, and this knob is horizontal when "LOCK" is set. It is composed of a folding part in which the part of the door that touches the unit is folded back up and a cutout part that is cut out at the "LOCK" position of this folding part, the plate shape of the operation piece One of the knobs of the lock shaft is formed to be larger than the rotation axis of the lock shaft.
At the "T" or "D.OUT" position, the knobs are placed at a position inclined by 45 °, and the lower part of the unit door is "TE".
The unit door is constructed by hitting the knob at the time of "ST" or "D.OUT", or the unit door has a through hole protruding only when the operation piece is at the "LOCK" position. It shall be provided and configured. The locking device for a control center unit according to claim 1. Further, in the configuration in which the through hole is provided in the unit door, the lock hole is provided at the portion where the knob portion projects from the through hole of the unit door when the operation piece is at the “LOCK” position.

[0017]

In the structure of the present invention, an operating piece for rotating the locking shaft is provided at the end of the operating side of the locking shaft, fixed to the operating shaft, and only when the operating piece is in the "LOCK" position. By providing an interlock mechanism that can close the unit door, the unit door cannot be closed at the "TEST" position or the "D.OUT" position.

In the interlock mechanism, one of the plate-shaped knob portions of the operation piece is formed to be large with respect to the rotation axis of the lock shaft, and the interlock mechanism is arranged in a horizontal position when "LOCK" is set. By forming a folded portion in which the portion contacting the unit of the above is folded back and providing a notched portion at the “LOCK” position of this folded portion where the knob hits, the position of “TEST” and “ Since the position of the notch is different in the position of "D.OUT" from that in the case of "LOCK", the unit door cannot be closed by hitting the folded part. Or, in the same manner as described above, in the interlock mechanism, one of the plate-like knob portions of the operation piece is formed to be large with respect to the rotation axis of the lock shaft, and the position is tilted upward by 45 ° when the lock is set. Placed in
Place the knobs at the "TEST" and "D.OUT" positions at an angle of 45 ° so that the lower part of the unit door hits the knobs when "TEST" or "D.OUT". Even with the configuration, the knobs cannot be closed by hitting the unit door with "TEST" and "D.OUT" as described above. Alternatively, by providing the interlock mechanism with a through hole through which the knob penetrates only when the operating piece is in the “LOCK” position, the knob is a through hole except for “LOCK”. The unit door cannot be closed because it does not penetrate.
Further, if a lock hole is provided in a portion protruding from the through hole of the knob portion, the unit door can be closed and then the lock can be used to lock.

[0019]

EXAMPLES The present invention will be described below based on examples.
1 is a plan view of a locking device showing a first embodiment of the present invention, FIG. 2 is a side view of the same, and the same members as those in FIGS. A is added to omit duplicate description. In these figures, the lock shaft 3
An operation piece 4A is attached to the left end of the drawing, which is the operation side of 4, and is fixed by a screw 42 so as not to be pulled out. Similar to FIGS. 10 to 15, the diagram shows the state of the “LOCK” position. The left end of the operation piece 4A is a knob portion 4A1 for pinching and rotating the operation piece 4A1. The knob portion 4A1 is asymmetric with respect to the locking shaft 34A and the rotation shaft 340 of the operation piece 4A, and the upper portion of FIG. It is provided unevenly.

The guide rail frame 26 of the unit door 12A
The portion that comes into contact with is provided with a folded-back portion 121 that is folded back upward, and the knob portion 4 of the operation piece 4A at the "LOCK" position is provided.
A portion having A1 is cut out to form a cutout portion 122. FIG. 3 is a partial front view showing a state in which the unit 2A provided with the locking device 3A of FIGS. 1 and 2 is housed in the control center, and the unit door 12A omits the front plate and surrounds the peripheral plate portion. And the folded-back portion 121 described above is visible. In this figure, the cutout portion 122 provided in the folded portion 121 is the knob portion 4 at the "LOCK" position.
It is provided so as to avoid A1.

At the positions of "TEST" and "D.OUT" of the knob portion 4A1 shown by the broken line, the knob portion 4A1 collides with the folding portion 121 as shown in the figure. Therefore, when the knob portion 4A1 is at the "TEST" or "D.OUT" position, the unit door 12A cannot be closed properly. Since it is practically impossible to put the control center into the operating state without closing the unit door 12A, the operating piece 4A, that is, the locking device 3A is in the operating state when not in the "LOCK" state. Therefore, the contact failure of the power plug 2 and the load plug of FIG. 8 does not occur. Although the operation piece 4A is in the "LOCK" position even in the test state, the unit 2A is pulled out a little at this time and is out of the storage room of the control center. Since the door 12A cannot be closed, it is not necessary to consider the test state as to whether the unit door 12A can be closed. The same is true for
In the case of "K", we will consider only the driving condition.

FIG. 4 is a partial front view showing a state in which the unit provided with the locking device according to the second embodiment of the present invention is housed in the control center. The knob portion 4A shown in FIG.
It is the figure which expanded the one part with 1 and showed the part. In this figure, the unit door 12 has the same structure as that of the conventional unit door 12 and is not provided with the folding portion 121. Instead, the knob portion 4A1 is set at a position having an angle of 45 ° from the horizontal line at any position,
“LOCK” is tilted to the upper left by 45 °, “TEST” is tilted to the lower left by 45 °, and “D.OUT” is tilted to the lower right by 45 °.

In "LOCK", the knob portion 4A1 has the rotary shaft 34
Since it is located on the upper side with respect to 0, it does not collide with the horizontally bent portion 123 of the lower portion of the unit door 12 shown by the diagonal lines, and therefore, the unit door 12 can be closed with the unit housed. There is no hindrance. On the other hand, "TE
In “ST” and “D.OUT”, the knob portion 4A1 is located downward with respect to the rotary shaft 340, and the lower tip end thereof collides with the bent portion 123 so that the unit door 12 cannot be closed.

In the case of this embodiment, the operation piece 4 shown in FIGS.
Although the mounting of A is horizontal, the operation piece 4A may be mounted at a position rotated by 45 ° in the clockwise direction. "LOCK",
Since all the relative positions of the knob portions 4A1 of "D.OUT" and "TEST" are the same as those shown in FIG. 15, the other members may be the same as those of the conventional ones in the first and second embodiments. Figure 5
6 is a plan view of a locking device showing a third embodiment of the present invention, and FIG. 6 is a side view of the same. The same members as those in FIGS. 1 and 2 are designated by the same reference numerals, and similar members are designated by a subscript B. And omit duplicate explanations. The difference between these figures and FIGS. 1 and 2 is that the knob portion 4B1 of the operating piece 4B is made long enough to protrude from the wall surface of the unit door 12B, and the protruding portion has a lock hole 4B.
3 is provided and a through hole 123 through which the knob portion 4B1 of the knob portion 4B1 at the “LOCK” position can pass is provided in the unit door 12B.

The through hole 123 has a length larger than the width dimension of the knob portion 4B1 as shown in FIG. 5 and larger than the plate thickness of the knob portion 4B1 as shown in FIG. 6, but the width dimension of the knob portion 4B1. It has an elongated shape with a width dimension much smaller than that. The position of “LOCK” is of course “D.OU
The positions of "T" and "TEST" are the same as those shown in Fig. 3, so
At the “TEST” position, the knob portion 4B1 is at a right angle to the through hole 123 and cannot penetrate the through hole 123.
At the "OUT" position, the position of the knob portion 4B1 is opposite to the rotary shaft 340 from the "LOCK" position.
At this position, the knob portion 4B1 cannot penetrate the through hole 123. Therefore, the unit door 12B can be closed when "LOCK", but "D.OUT",
An interlock mechanism having the same function as that described above, in which the knob portion 4B1 interferes and the unit door 12B cannot be closed when both are "TEST", is provided.

The lock hole 4B3 provided in the knob portion 4B1 is for locking, and the lock hole 4B3 is provided after the unit door 12B is closed in the "LOCK" state and in the operating state.
If you use the to lock the unit door 12B, no one other than the person holding the lock key can open the unit door 12B.
There is no case where a person concerned does not open the unit door 12B intentionally or a person who is not concerned intentionally pulls out the unit.

As described above, each of the embodiments has an interlock mechanism which is provided with an operation piece directly connected to the locking shaft and which can close the unit door only when the knob portion is in the "LOCK" position. Installation tab, "D.OUT",
You will not be able to close the unit door when in the "TEST" position. As the unit door is not actually opened with the door open, the unit will never be in a state other than "LOCK" while current is flowing through the power plug or load plug. There is no possibility that problems such as increased wear of contacts and local overheating due to poor contact will occur.

[0028]

As described above, according to the present invention, the operation piece directly connected to the lock shaft is provided, and the unit door can be closed only when the operation piece is in the "LOCK" position for fixing the position of the unit. By providing an interlock mechanism that can not close the unit door because the operation piece gets in the way when it is in the "D.OUT" or "TEST" position,
At the “TEST” position and the “D.OUT” position, the unit door will remain open, so even if it is mistaken, the control center will not be in the operating state and the power supply that connects the unit door and the circuit in the control center. It is possible to obtain the effect that there is no risk of poor contact between the plug and the load plug, and there is no possibility of problems such as increased wear of the contacts and local overheating due to poor contact.

In the interlock mechanism, the shape of the plate-like knob portion of the operation piece is biased to one side of the rotating shaft,
Place it so that it is horizontal when in the CK position, while
The position of the "LOCK" is provided by providing a folded-back part where the part of the unit door that contacts the unit is folded back up and a cutout part that is cut out at the part where the knob part at the "LOCK" position of this folded-back part collides. The unit door can be closed because the folding part does not get in the way, but at the "TEST" and "D.OUT" positions, the knob part hits the folding part and the unit door cannot be closed. Then, the above effect can be obtained. Also, when the knob of the operation piece described above is set to "LOCK",
At the position tilted upward, at the position of "TEST" and "D.OUT", it is arranged at the position tilted downward at 45 °.
The interlock mechanism similar to that described above is also formed by allowing the knob portion to hit the lower portion of the unit door at the time of "."

Further, the knob portion is made long enough to protrude the unit door, a through hole is provided in the unit door through which the knob portion penetrates when it is in the "LOCK" position, and the shape of this through hole is changed to a cross section of the knob portion. By making the elongated shape according to the shape, the knob portion cannot penetrate the through hole at the time of "D.OUT" or "TEST", so that the same interlock mechanism as described above is formed. If you lock the unit door by setting a lock hole in the part where the knob penetrates through the through hole and then closes the unit door, only the person who has the key of this lock can open the unit door. Therefore, it is possible to obtain the effect that the unit door cannot be intentionally opened by a person concerned who is not concerned or who is not concerned.

[Brief description of drawings]

FIG. 1 is a plan view of a locking device showing a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a partial front view of a control center near the locking device of FIG.

FIG. 4 is a partial front view of a control center showing an embodiment of the present invention different from FIG.

FIG. 5 is a plan view of a locking device showing a second embodiment of the present invention.

6 is a side view of FIG.

FIG. 7 is a two-sided view of the controller center, where (a) is a front view and (b) is a side view.

FIG. 8 is a plan view of the unit.

FIG. 9 is a front view of the unit.

FIG. 10 is a plan view of a conventional locking device.

11 is a side view of FIG.

FIG. 12 is an exploded view of the locking device of FIG.

13 is a partial plan view of the unit table of FIG.

14 is a front view of the lock plate seen from the left side of FIG.

15 is a partial front view of FIG.

[Explanation of symbols]

1 ... Control center, 12, 12A, 12B ... Unit door, 2, 2A ... Unit, 26 ... Guide rail frame 3, 3A, 3B ... Locking device, 30, 30A, 30B
... Locking device frame, 33 ... Locking plate, 34, 34A, 34B ...
Lock shaft, 4A, 4B ... Operation piece, 4A1, 4B1 ... Knob, 4B3 ... Lock hole, 121 ... Folding section, 122 ... Notch section,
123 ... Through hole

Claims (5)

[Claims] 1. A unit of a control center, in which units are stored in a plurality of unit tables and unit doors are closed, is fixed to an operation or test position in accordance with predetermined angular positions of the lock shaft that differ by 90 °. "LOC
K ”), movable between operating and test positions (“ TES
T ”) and three states of free access (“ D.OUT ”)
In the lock device of the control center unit that is selected by operating from the outside, an operation piece for rotating the lock shaft is provided at the operation side end of the lock shaft fixed to the operation shaft. A locking device for a control center unit, which is provided with an interlock mechanism capable of closing the unit door only when in the "LOCK" position. 2. The interlock mechanism is arranged at a position in which one of the plate-like knob portions of the operation piece is formed to be large with respect to the rotation axis of the locking shaft, and the knob portions are horizontal when "LOCK" is set. The part of the unit door that comes into contact with the unit is folded back, and the notch is formed by notching the part where the knob collides at the "LOCK" position of the folded part. The locking device for a control center unit according to claim 1. 3. The interlock mechanism, in which one of the plate-shaped knob portions of the operation piece is formed to be large with respect to the rotation axis of the locking shaft, and the " TES
At the "T" or "D.OUT" position, the knobs are placed at a position inclined by 45 °, and the lower part of the unit door is "TE".
2. The locking device for a control center unit according to claim 1, wherein the locking device is configured to hit the knob portion when "ST" or "D.OUT". 4. The interlock mechanism has an operation piece "LOCK".
2. The locking device for a control center unit according to claim 1, wherein the unit door is provided with a through hole through which the knob portion penetrates only when it is in the position. 5. The control center unit according to claim 4, wherein a lock hole is provided at a portion of the knob protruding from the through hole of the unit door when the operation piece is at the “LOCK” position. Locking device.