JPS6240808B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an interlock mechanism for a switching switch that switches between two different power sources, such as a regular power source and a standby power source.

A switching switch is used to switch from a regular power source to a backup power source such as in-house power generation in the event of a power outage, for example, but if two types of power sources are turned on at the same time, the power sources will mix, which can lead to a major accident. There is a risk of connection. Therefore, it is necessary to provide the switching switch with an interlock mechanism to ensure that both power supplies are never turned on at the same time. This interlock is
This may be done electrically, but if a failure occurs in the control circuit or if manual operation is required,
The electrical interlock will not work and there is a risk that both power supplies will be turned on at the same time. In addition, if the main body of the switch is a drawer type that automatically opens and connects to the main circuit by moving it back and forth, when the internal contact is closed on either power source side, There is a problem in that it is dangerous to connect or disconnect the main circuit by moving the switch body.

The present invention has been made by focusing on the above-mentioned problems in switching switches, and aims to provide a mechanical interlock mechanism that does not require a control circuit, has a relatively simple structure, and is reliable in operation. The purpose is

Embodiments of the invention will be described below with reference to the figures. The main body 1 of the switching switch is installed on a trolley 2, and a base 3
It can be moved back and forth on the top. On the back of main body 1,
For example, two sets of input terminals 4 and 5 are connected to two different types of power supply terminals 8 and 9, such as a regular power supply and a standby power supply, and an output terminal 6 is connected to the load side.
It is installed with the tip facing backwards. The main body of this switching switch has a circuit configuration as shown in FIG. 4, and internal contacts C ₁ and C ₂ are switched manually or electrically to switch the power supply to the load side.

On the other hand, a support frame 7 erected on the base 3 at the rear of the main body 1 is provided with a regular power supply terminal 8 and a standby power supply terminal at positions facing the respective terminals 4, 5, and 6 of the main body 1 via insulators. Terminal 9 and load side terminal 10 are fixed. The terminals 8, 9, and 10 of these main circuits are of a clip type, and can be contacted by holding the terminals 4, 5, and 6, respectively, when the main body is retracted. That is, the main body 1 is disconnected from the main circuit in its pulled-out position, and is connected to the main circuit in its pushed-in position.

The opening and closing operations of contacts C ₁ and C ₂ in the main body 1 are performed by the fifth,
In conjunction with the forward and backward movement of the shafts 11 and 11', which is clearly shown in FIG. 6, the circuit is closed when the shafts 11 and 11' are in their forward positions, and is opened when they are in their backward positions. The shafts 11 and 11' are provided such that their front ends are spaced apart from the front frame 12 of the main body 1 by a predetermined distance. Both shafts 11, 11'
In between, two rectangular lock plates 13 and 13' are arranged so that their front sides are in contact with the front frame 12, overlapping each other, and are movable left and right along the front frame 12, respectively. This lock plate 13,1
The width of 3' is large enough to fit into the space between the front end of the shaft 11 or 11' in the retracted position and the front frame 12. Triangular levers 1 are attached to the shafts 11 and 11', respectively.
The rear tops of 4 and 14' are pivotally connected by pins 15 and 15'. The levers 14, 14' are horizontally rotatably supported on the main body 1 by vertical shafts 16, 16' at their inner tops, and the front tops of the levers 14, 14' are supported by bolts 1, respectively.
7, 17', said one lock plate 13, 1
3' is pivotally attached to one end. One bolt 1
7 is movably passed through a guide hole 13'a bored in the other end of the upper lock plate 13', and is journalled in a receiving hole 13b bored in one end of the lower lock plate 13, and is supported by the other bolt. 17' is rotatably supported in a receiving hole 13'b drilled in one end of the upper lock plate 13', and is freely movable through the receiving hole 13'b drilled in the other end of the lower lock plate 13. It is inserted. A circular hole 13 is provided in the center of each lock plate 13, 13'.
c, 13'c are bored, and these circular holes 13c, 13'c
Continuously, circular holes 13c, 1 are formed at one end of each
Notches 13d and 13'd having a width narrower than 3'c are formed. And these circular holes 13c, 13'c
A vertical lock pin 18 is provided at the top of the body 1 so as to be movable up and down with respect to the main body 1 and biased downward by a spring 19. Lock pin 18
has a small diameter part 18a that is constricted on the way, and has a lever 18b extending horizontally at the top thereof, which can be inserted into the circular holes 13c, 13'c, and the small diameter part 18a has notches 13d, 13'd. Can be moved freely within. The lower end of the lock pin 18 that has passed through the circular holes 13c and 13'c is inserted into a pair of front and rear lock holes 20a and 20b of a guide plate 20 provided at the upper center of the base 3 so as to extend in the front and back direction. can also be fitted. Lock holes 20a, 20b of guide plate 20
are provided at intervals from each other in the front and back, and the front lock hole 20 is located at the disconnection position from the main circuit of the main body 1.
a (FIG. 7A) and, in the connection position, into the rear locking hole 20b (FIG. 7B).

Next, the effect will be explained. Place the main body 1 of the switch on the base 3 installed in the switchboard, and tighten the lock pin 18.
If you push it backwards while pushing it up against the spring 19, the terminals 4, 5, 6 on the back will automatically contact the corresponding terminals 8, 9, 10 on the rear, and the main circuit 1 and the main circuit will be connected. Connected. In this state, lock pin 1
8, its tip falls into the lock hole 20b at the rear of the guide plate 20, and the lock pin 18 is released again.
The main body 1 cannot be pulled out unless pushed up by hand (Fig. 7B). This completes the installation of main unit 1. When performing maintenance or equipment replacement, use lock pin 1.
The connection between the main circuit and the main body 1 is cut off by pushing up the main circuit 8 and pulling out the main body 1 from the switchboard with its tip pulled out from the lock hole 20b. 7th
At the position where the connection between the main circuit and the main body 1 is cut off as shown in Figure A, the lock pin 18 is again inserted into the guide plate 20.
It falls into the lock hole 20a in front of the. Therefore, the lock pin 18 slides on the guide plate 20 at an intermediate position from the connection position to the disconnection position of the main body 1, as shown in FIGS. 7C and 11. When the switch main body 1 is in the connected position shown in FIG. 7B or in the disconnected position shown in FIG. Lock plate 13,1
When the contacts C ₁ and C ₂ of the switch main body 1 are both open at the height position 3', the shafts 11 and 11' are both in the retracted position as shown in FIG. When one contact point _C1 is closed from this state, one shaft 11 moves forward as shown in FIG. Guide slot 1
3′a to the right in FIG. 9B,
Along with this, the lower lock plate 13 moves to the right, and its right end part cuts into the front part of the other shaft 11'. Therefore, even if you try to close the other contact _C2 in this state, the shaft 1
1' is obstructed by the lock plate 13 and cannot move forward, so it is mechanically locked and cannot do this. At this time, it is also electrically locked. Conversely, if the other contact _C2 is closed, the first
As shown in Figure 0, the lock plate 13' moves to the left and cuts into the front of the shaft 11, blocking its forward movement. In this way, when either contact C ₁ or C ₂ is closed, the small diameter portion 18a of the lock pin 18 is connected to the lock plate 1, as shown in FIGS. 9 and 10.
3 or 13', and in this state, in order to pull out the main body 1, an attempt is made to pull out the tip of the lock pin 18 from the receiving hole 20a or 20b of the guide plate 20. too,
The large diameter part of the lock pin 18 has a notch 13d or 1
Since it cannot pass through 3'd, it cannot be pulled out. Therefore, when either of the contacts C ₁ or C ₂ is in the closed state, it is impossible to pull out the main body 1 and disconnect it from the main circuit.

Next, the main body 1 is in an intermediate position as shown in FIG.
If the lock pin 18 is resting on the top surface, the large diameter portion of the lock pin 18 is attached to the lock plate 13, as shown in FIG.
Since it is located at the height of 13', the lock plate 13,1
3' cannot move left or right. That is, when the main body 1 is in the intermediate position, the closing operation of the contacts C ₁ and C ₂ cannot be performed.

Among the above, the interlock effect can be summarized as follows. (1) Both contacts inside the switch body 1
When both C ₁ and C ₂ are in the open circuit state and both power supplies are in the "off" state, either one of the power supply side contacts C ₁ or C ₂ can be closed. (2) If either contact C ₁ or C ₂ is closed,
The other one is absolutely impossible to input. (3) The contacts C ₁ and C ₂ of the main body 1 can be opened and closed only when the switch body 1 is in the disconnection position and the connection position, and the opening and closing operations are not possible in intermediate positions. (Four)
When either contact C ₁ or C ₂ is closed, the main body 1 cannot be moved from the disconnection position to the connection position, or conversely from the connection position to the disconnection position.

The above-mentioned interlocking action prevents the two types of power sources from coming into contact with each other, and also prevents the main circuit from being disconnected or connected to the main circuit due to movement of the main body 1 in the ON state, thereby avoiding the danger associated with this.

Note that the interlock mechanism for preventing two types of power sources from coming into contact with each other is not limited to a drawer-type switching switch, but can also be applied to a fixed type switch. That is, in this case, the structures of the lock pin 18, the circular holes 13c, 13'c, and the notches 13d, 13'd of the lock plates 13, 13' are unnecessary.

As explained above, the first invention provides a pair of left and right shafts 11 that can be moved forward and backward, respectively, in conjunction with the closing and opening operations of the two contacts C ₁ and C ₂ in the switch main body 1. , 11' are provided, and these shafts 1
Two lock plates 13, 13' are provided in front of the switches 1, 11' so as to be movable from side to side. The lock plates 13, 13' are pivotally connected to one end of the plates 13, 13', and the rear portions are pivotally connected to the respective shafts 11, 11', so that the lock plates 13, 13' are rotated as the shafts 11, 11' move forward. Since the shafts 11 and 11' are moved forward to block their path and prevent both contacts C ₁ and C ₂ from being turned on at the same time, it is possible to mechanically and reliably prevent the two types of power sources from coming into contact with each other. Moreover, since the mechanism is simple, it has the effect of providing a mechanical interlock mechanism for a switching switch that can be downsized. , notches 13d, 13'd, lock pin 18, guide plate 2
0 lock holes 20a and 20b, contacts C ₁ ,
When either _C2 is turned on, movement of the switch main body 1 from the disconnection position to the connection position or from the connection position to the disconnection position is prevented, which has the effect of avoiding danger associated with movement.

[Brief explanation of the drawing]

Fig. 1 is a front view, Fig. 2 is a plan view, Fig. 3 is a side view, Fig. 4 is a circuit diagram, Fig. 5 is a cross-sectional view of main parts,
Fig. 6 is a perspective view of the main part, Fig. 7 is a schematic side view showing the relationship between the position of the main body and the state of the lock pin, and Figs. 8 to 11 show the operation of the interlock mechanism. A is a front view, and B is a bottom view. 1... Switch body, 11, 11'... Shaft, 12... Front frame, 13, 13'... Lock plate, 13c, 13'c... Circular hole, 13d, 1
3'd...notch, 14,14'...lever, 18...
...Lock pin, 18a...Small diameter part, 20...Guide plate, 20a, 20b...Lock hole, C ₁ , C ₂ ...
…contact.

Claims (1)

[Scope of Claims] 1. A pair of left and right shafts that are provided to be movable back and forth in conjunction with the closing and opening operations of two contacts in the switch main body, and a pair of left and right shafts provided in front of these shafts in a direction perpendicular to these shafts, respectively. two lock plates provided so as to be movable and to block the front of the left or right shaft, respectively, when moving from side to side; the rear portions of each lock plate are pivotally connected to the corresponding shaft; It is pivotally connected to the main body of the switch, and the front portion of each is pivotally connected to the corresponding one of the lock plates so as not to move the other lock plate, and each lock plate is moved in conjunction with the forward movement of each of the shafts. An interlock mechanism for a switching switch, comprising a pair of levers that move each other forward of the other shaft, and wherein simultaneous closing of both of the contacts is prevented. 2. In a drawer-type switching switch that electrically opens and connects the main circuit with the main circuit by moving the switch main body on the base back and forth, the A pair of left and right shafts each of which is movable back and forth, and a pair of left and right shafts provided in front of these shafts so as to be movable left and right in a direction perpendicular to these shafts, respectively, and to be able to block the path of the left or right shaft, respectively, when moving left and right. two lock plates, each rear portion being pivotally connected to the corresponding shaft, each intermediate portion being pivotally connected to the switch main body, and each front portion being pivotally attached to one of the corresponding lock plates, and the other being pivotally attached to the corresponding one of the lock plates; a pair of levers that are pivotally mounted so as not to move the lock plates, and move each lock plate forward of the other shaft in conjunction with the advancement of each of the shafts, and each of the lock plates further includes: It has a circular hole in the center that overlaps each other vertically in the retracted position of both shafts, and a narrow notch that is continuous with the circular hole and is provided in a direction opposite to the direction of movement of the lock plate when the shaft moves forward, The switch main body has a large diameter part at its lower end that can pass through the mutually overlapping circular holes of both lock plates, and a small diameter part at its upper part that can be moved relative to each other within the notch when each lock plate moves. A lock pin having a vertically movable and downwardly biased lock pin is provided at the bottom of the switch main body on the base and extends in the front and back direction, and is located at a position where the switch main body is separated from the main circuit. At the connection position, a guide plate having a pair of front and rear lock holes capable of receiving the tip of the lock pin protruding downward through the overlapping circular holes of the lock plate is fixed, and the switch body is prevented from moving when the contacts are in the closed state. An interlock mechanism for a switching switch, characterized in that: