JPH0777096B2 - Auxiliary switch - Google Patents

Description

TECHNICAL FIELD The present invention relates to an auxiliary switch that opens and closes in conjunction with the opening and closing operation of a circuit breaker.

"Problems to be Solved by Conventional Techniques and Inventions" The auxiliary switch opens and closes in conjunction with the opening and closing operation of the circuit breaker.

In a conventional auxiliary switch, for example, when the operating angle is set to 90 °, the opening / closing stroke of the circuit breaker is directly transmitted to the auxiliary switch, so if the stroke is too long, adjust the connecting member etc. As much as possible, the auxiliary switch is not affected by overstroke. If possible, it is desirable to make adjustment unnecessary by devising the structure of the connecting member.

Further, as shown in FIG. 8, the auxiliary switch 101 includes a shaft 102 for switching the operation of its contact, an arm 103 and a lever.
Since it is connected to the circuit breaker via 104 and the operation of the circuit breaker is directly transmitted, the shock at the initial stage of operation is transmitted to the shaft 102 of the auxiliary switch 101, and if used for a long time, the shaft 102 causes metal fatigue. The shaft 102 is deformed or damaged.

Furthermore, although the operation of the circuit breaker is 90 ° and the operation of the auxiliary switch is also 90 ° in the past, it is required to increase the angular velocity of the operation of the auxiliary switch.

"Means and Actions for Solving the Problems" Means and actions for the present invention to solve the above problems are as follows.

A lever that rotates around the central axis by the opening and closing actuating force of the circuit breaker and a long plate-shaped cam fixed to the shaft that turns and switches the operating state of the contact of the auxiliary switch are arranged so that the tips overlap. An auxiliary switch is provided with an operating shaft at the tip of the lever, and the operating shaft is located in a guide groove formed in the longitudinal direction of the cam.

In addition, the lever that rotates around the central axis by the opening and closing actuating force of the circuit breaker and the long plate-shaped cam that is fixed to the shaft that turns and switches the operating state of the contact of the auxiliary switch should overlap. , The working shaft is provided at the tip of the lever, the working shaft is positioned in the guide groove formed in the longitudinal direction of the cam, and the roller is fitted on the working shaft so that the shaft is not impacted in the initial stage of the working. It is an auxiliary switch.

In addition, the lever that rotates around the central axis by the opening and closing actuating force of the circuit breaker and the long plate-shaped cam fixed to the shaft that turns and switches the operating state of the contact of the auxiliary switch are overlapped at their tips. , The operating shaft is provided at the lever tip, the operating shaft is located in the guide groove formed in the longitudinal direction of the cam, and the operating angle of the circuit breaker is α °. When the angle is β °, it is an auxiliary switch that can switch the contact of the auxiliary switch when α <β.

[Embodiment] In FIGS. 1 and 2, a shaft 2 for switching the operation of the contact is projected on the auxiliary switch 1, and a cam 3 for rotating the shaft 2 is fixed to the projection. In addition, a collar 6 is attached to the central shaft 5 which is horizontally mounted in the U-shaped support frame 4.
A lever 7 made of two plate members is rotatably provided with a short piece 8 and a long piece 9 in a bifurcated shape, and the central shaft 5 is provided at the base end of the lever 7. The shaft 10 is horizontally mounted between the plate materials at the tip of, and the operating shaft 11 is horizontally mounted between the plate materials at the tip of the long piece 9, and the roller 12 is rotatably provided on the operating shaft 11. The cam 3 has a long plate shape and is provided with a guide groove 13 which is located on the same axis as the shaft 2 and whose front end is open. The roller 12 of the lever 7 is received in the guide groove 13. Therefore, when the power from the circuit breaker (not shown) is transmitted to the shaft 10 of the lever 7, the lever 7 rotates about the central shaft 5, and the roller 12 of the lever 7 passes through the guide groove 13 through the guide groove 13. Power is transmitted to the cam 3.

The operation of the lever 7 and the cam 3 will be described.

FIG. 3 shows the movement of the cam which rotates in accordance with the rotation of the lever 7 which is interlocked with the opening / closing stroke of the circuit breaker. When the power from the circuit breaker is transmitted to the shaft 10 of the lever 7 in FIG. 3a, it starts to rotate clockwise around the central shaft 5. The roller 12 of the actuating shaft 11 of the lever 7 is located in the guide groove 13 of the cam 3 and rotates about the central axis 5, and the cam 3 is placed in the guide groove 13 of the roller.
12 is slid toward the receiving center and rotated so that the state shown in FIG. 3b is reached. In the illustrated state, the guide groove 13 of the cam 3
Is facing horizontally. Further, when the lever 7 rotates, the roller 12 slides in the guide groove 13 in the direction away from the center to rotate the cam 3 and the state shown in FIG. 3c is obtained.

When this state is carefully observed, it is as shown in FIG.

The cam 3 moves 90 ° only when the lever 7 moves 40 °. The contact operating angle of the auxiliary switch 1 is 90 °, as shown in FIG. Then, the operation of the auxiliary switch 1 by 90 ° is completed by the operation of the lever 7 by 40 °.

When the lever 7 moves 90 °, the cam 3 moves 90 ° + 2 ×
Rotate 6 ° and rotate only 6 ° on each side. It is within the range of 6 ° even if the lever 7 further rotates 25 ° after the lever 7 rotates 90 °. That is, when the operation of the lever 7 is in the range of 40 ° to 140 °, the cam 3 moves over 90 ° to an operating angle of about 6 °.
Since 90 ° is maintained substantially, it is possible to sufficiently absorb the influence of the overstroke and the stroke shift of the switching operation of the circuit breaker on the contact operation of the auxiliary switch 1.

As shown in FIG. 8, in the conventional auxiliary switch, the power of the circuit breaker is directly transmitted to the shaft for switching the operation of the contact, and the shock is applied at the initial stage of operation, so if it is used for a long time,
The shaft suffered metal fatigue, and the shaft was deformed or damaged.

However, in the present invention, as shown in FIG. 1 and FIG. 2, the power from the circuit breaker causes the lever 12 to rotatably fit the operating shaft 11 of the roller 12 into the guide groove 13 of the cam 3. Since the power is transmitted by sliding the guide groove 13 while rotating it, the shaft 2 is not impacted.

In the conventional type, the operation of the circuit breaker was 90 °, and the auxiliary switch 1 was also operating 90 °.

In the present invention, with respect to the operating angle of the lever 7 which is the operating angle of the circuit breaker, the operating angle of the cam 3 which is the operating angle of the auxiliary switch 1 is examined.

From position A at the beginning of the operation of lever 7 in FIG. 4 to position B at the end of the operation
See the 40 ° range to the position. Axis 10 of lever 7 in position A
Then, it rotates to the right and reaches the B position. When the movement of the cam 3 which is driven by the rotation of the lever 7 during this period is shown by a drawing, it is shown in a graph as shown in FIG.
It is a figure. When the operating angle of lever 7 is near 0 °, lever 7
The maximum operating angle of cam 3 per 1 ° operation is 3.5 °
Then, it gradually decreases and the working angle of the lever 7 becomes 1 ° at 20 °, and it further decreases and the working angle of the lever 7 becomes 40 °.
At 0 ° and increases thereafter. However, as described above, the operating angle of the cam 3 is 45 °, that is, the operating angle of the lever 7, which is 90 ° for switching the contact operation, is used within the range of 20 °. Therefore, the auxiliary switch 1 operates when the circuit breaker operates at 40 °, and the angular velocity during that time increases as compared with the conventional type.

[Advantages of the Invention] The present invention relates to a long plate-shaped cam fixed to a lever that rotates around a central axis by an opening / closing actuation force of a circuit breaker and a shaft that rotates and switches the operating state of a contact of an auxiliary switch. And are arranged so that the tips overlap, and an operating shaft is provided at the tip of the lever.
Since the auxiliary switch has the actuating shaft positioned in the guide groove formed in the longitudinal direction of the cam, the adjustment is not required by devising the structure of the connecting member.

According to the present invention, a lever that rotates around a central axis by an opening / closing actuation force of a circuit breaker and a long plate-shaped cam fixed to a shaft that turns and switches the operating state of a contact of an auxiliary switch are provided at the tip end portion. Arrange them so that they overlap, and provide an operating shaft at the tip of the lever.
Since the operating shaft is located in the guide groove formed in the longitudinal direction of the cam, and the roller is externally fitted to the operating shaft so that the shaft is not impacted in the initial stage of operation,
The shock in the initial stage of operation is not transmitted to the shaft of the auxiliary switch, and the shaft is not deformed even if it is used for a long period of time.

According to the present invention, a lever that rotates around a central axis by an opening / closing actuation force of a circuit breaker and a long plate-shaped cam fixed to a shaft that turns and switches the operating state of a contact of an auxiliary switch are provided at the tip end portion. Arrange them so that they overlap, and provide an operating shaft at the tip of the lever.
If the operating shaft is located in a guide groove formed in the longitudinal direction of the cam, and the operating angle of the circuit breaker is α ° and β ° is necessary for switching the contact of the auxiliary switch, β <β of the auxiliary switch The operation of the auxiliary switch can be improved because it is an auxiliary switch that can switch contacts.

[Brief description of drawings]

1 to 7 show a specific embodiment of the present invention, in which FIG. 1 is a front view showing a state in which a lever of a circuit breaker and a cam of an auxiliary switch are connected, and FIG. 3 is a front view showing the operating state of the lever and the cam, FIG. 3a is the initial operating state, FIG. 3b is the intermediate state, FIG. 3c is the operating end state, and FIG. Is a front view for explaining the operation state of the lever and the cam, FIG. 5 is a view showing the contact operation angle of the auxiliary switch, and FIG. 6 is a drawing showing the operation angle of the cam per 1 ° operation of the lever, FIG. 7 is a chart showing the operating angle of the cam per 1 ° operation of the lever, and FIG. 8 is a front view showing a conventional turning device for the auxiliary switch shaft. 7 Lever 1 Auxiliary switch 2 Shaft 3 Cam 11 Actuator 12 Roller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Nojiri 8 Horai-cho, Marugame-shi, Kagawa Mitsubishi Electric Corporation Marugame Co., Ltd.

Claims (3)

[Claims] 1. A front end portion of a lever that rotates around a central axis by an opening / closing actuation force of a circuit breaker, and a long plate-shaped cam fixed to a shaft that rotates and switches the operating state of a contact of an auxiliary switch. Auxiliary switch which is arranged so as to overlap with each other, an operating shaft is provided at the tip of the lever, and the operating shaft is positioned in a guide groove formed in the longitudinal direction of the cam. 2. A tip end portion of a lever which is rotated around a central axis by an opening / closing actuation force of a circuit breaker, and a long plate-shaped cam fixed to a shaft for turning and switching an operation state of a contact of an auxiliary switch. Are arranged so that they overlap each other, an operating shaft is provided at the tip of the lever, the operating shaft is positioned in a guide groove formed in the longitudinal direction of the cam, and a roller is fitted onto the operating shaft so that the shaft is not impacted at the initial stage of operation. Auxiliary switch not to be applied 3. A distal end portion of a lever which is rotated around a central axis by an opening / closing actuating force of a circuit breaker, and a long plate-shaped cam fixed to a shaft for rotating and switching an operating state of a contact of an auxiliary switch. Are arranged so that they overlap each other, an operating shaft is provided at the tip of the lever, and the operating shaft is positioned in a guide groove formed in the longitudinal direction of the cam, and the contact angle of the auxiliary switch is switched when the operating angle of the circuit breaker is α °. Auxiliary switch that can switch the contact of the auxiliary switch when α <β if the required operating angle is β °