JPH0211690Y2 - - Google Patents

Description

[Detailed explanation of the idea] This proposal relates to an improvement of a spring operating device for a switch.

Figure 1 shows an exploded view of an example of a conventional spring operating device.
The switch 1 is shown in the closed position. In this position, the fixed contact 2 and movable contact 3 of the switch are in contact, and the current-carrying path is closed by the path of terminal 4, fixed contact 2, movable contact 3, sliding contact 5, and terminal 6. has been completed. The movable contactor 3 is connected to an output lever 9 of the operating device by a link device 8 via an insulating rod 7,
When this contacts the circuit closing side stopper 10, it is stably maintained at the circuit closing position.

The output lever shaft 12 has an engaging portion 1 provided with a claw 14.
3 is fixed. Left contact surface 14- of the claw 14
1 is maintained in a closed circuit position in a state in which it is in contact with the contact surface 15-1 on the output side of the driver 15 that moves toward and away from the drive element 15. The driver 15 has a keyhole 16 at its center of rotation.
is provided with a drive shaft 17 which is integrally fixed to the spring lever 18 and serves as the axis of rotation thereof.
Since the output end 17-1 of the spring lever 18 is fitted, the spring lever and the driver are integrated, and in the closed position, the pin 18-1 provided on the spring lever 18 is at the position shown in A, and the compression spring 19 drive-side spring bearings 20 are pivotally mounted, and the force of the spring 19 is transferred to the contact surface 15 of the drive shaft 17 and the drive element 15 via the spring lever 18.
-1, contact surface 14-1 of claw 14, output lever shaft 12
The signal is transmitted to the output lever 9 via the output lever 9, which is pressed against the circuit-closing stopper 10 and maintained at that position at all times while the switch 1 is closing the circuit.

To open the switch 1, the drive motor 21 rotates the worm wheel 22, which is paired with the worm wheel 23, so that the worm wheel 23 rotates in the direction of arrow C. Then, the claw 23- provided protruding from the end face of the worm wheel 23
1 rotates in the direction of arrow C and the claw 15 of the driver 15
-3 and continues to rotate in the same direction, the contact surface 15-1 of the driver 15 contacts the engaging portion 15-3.
The output end 17-1 is separated from the contact surface 14-1 of the pawl 14 and fitted into the key hole 16 of the driver 15, and the drive shaft 17 is integrated with the worm wheel and the driver to move the spring lever 18 from the A position. Rotate counterclockwise toward position B.

At this time, the spring 19 is attached to the pivot pin 19 on the fixed support side.
As the rotation progresses to a dead center position where the pin 18-1 of the spring lever 18 and the drive shaft 17 are aligned in a straight line, energy is stored while being compressed.

As soon as the spring 19 passes through the dead center, the spring 19 is released, and the spring lever 18 is further rapidly pushed counterclockwise by the spring force and continues to rotate, causing the drive shaft 17 to rotate the driver 15. , contact surface 1 of the driver
5-2 comes into contact with the contact surface 14-2 of the pawl 14 of the engaging portion 13, and both rotate counterclockwise. Therefore, the output lever shaft 12 and the output lever 9 fixed thereto are rotated counterclockwise, and the movable contact 3 is pulled up via the link device 8 and the insulating rod 7 and separated from the fixed contact 2. and continue the opening operation.

When the movable contactor 3 reaches the open position, the output lever 9 comes into contact with the open-circuit side stopper 11 and stops rotating, and the tension of the spring 19 is constantly applied to the spring lever 1.
8. Drive shaft 17, drive element 15 and its contact surface 15-
2. The force is transmitted through the contact surface 14-2 of the pawl 14 and the output lever shaft 12, and the output lever 9 maintains a state in which it is pressed against the open-side stopper 11. The spring lever 18 rotates by an angle θ ₂ and the spring 19 swings by an angle θ ₁ .

The following points are listed as drawbacks of such a conventional example.

1 The effective radius of the engaging part of the driver 15 and the engaging part 13 and the pressure receiving part of the contact surface is only about twice the radius of the drive shaft, and on the other hand, it is considerably smaller than the effective radius of the spring lever, so the shaft torque due to the spring force The corresponding pressing load on the claws and contact surfaces increases. For this purpose, it is necessary to increase the mechanical strength of the claws and contact surfaces, which requires high-quality materials, increases the precision of surface finish, requires advanced heat treatment, and the machining shape becomes complex, so the number of machining steps is reduced. This necessitates the adoption of complicated and expensive components.

2. When the claw and the engaging part come into contact, it has been customary to use a claw structure that provides a cantilevered load, but in this case, as the load increases, the deflection increases and the pressure contact surfaces Since the strain increases in the direction of separation, the effective pressure-receiving area decreases, resulting in the disadvantage that the contact pressure further increases.

3. Manufacturing errors in the claws occur during the parts manufacturing process and cannot be avoided in reality. In the conventional example, this error appears as an inclination of the pressure contact surface, which reduces the effective pressure receiving area and increases the contact pressure.
Furthermore, dimensional errors, wear and deformation of pressure-receiving parts such as contact surfaces appear as magnified errors in the rotation angle.

The present invention has been proposed in view of the above points, and aims to eliminate the above-mentioned inconveniences and provide a simple, robust, and economical spring operating device for a switch suitable for a large output type.

Figure 2 is an exploded perspective view showing one embodiment of the present invention.
The switch 1 is shown in the closed position. The code in the figure is the first
According to the diagram. In this position, the fixed contact 2 and the movable contact 3 of the switch 1 are in contact, and the energization path is formed by the path of the terminal 4, the fixed contact 2, the movable contact 3, the sliding contact 5, and the terminal 6. Closed.

The movable contactor 3 is connected to a link device 8 via an insulating rod 7.
is connected to the output lever 9 of the operating device.
One end of an output lever shaft 12A is fixed to the output lever 9. The other end side of the output lever shaft 12A is
First, the driver element 1 is inserted into a hole provided at one end of the spring lever 18A-2, and then the driver element 1 whose outer periphery is approximately C-shaped.
Pass through the key hole 16 of 5A and finally insert the spring lever 1.
At the point where the spring lever 18A-1 is inserted into a hole provided at one end, a split pin (not shown) or the like is provided at the tip of the spring lever 18A-1 to prevent the spring lever 18A-1 from coming off the output lever shaft 12A.

Therefore, the two spring levers 18A-1, 18A
-2 is rotatably supported by the output lever shaft 12A, while the driver 15A and the output lever shaft 12A are fitted into each other so that they rotate together. The drive element 15A is stably maintained in the closed circuit position by coming into contact with the circuit closing side stopper 10.

When the switch 1 is closed, the force of the spring 19 is 2
It is transmitted to the drive roller 18A-3 which is sandwiched between the spring levers 18A-1 and 18A-2 and is free to rotate with respect to the pin 18A-4.
3 remains in pressure contact with the contact surface 15A-1 of the drive element 15A.

To open the switch 1, the drive motor 21 rotates the worm wheel 22, which is paired with the worm wheel 23, so that the worm wheel 23 rotates in the direction of arrow C. Then, the hoisting lever 23A-1, which is fixed coaxially with the worm wheel 23, continues to rotate in the C direction, that is, in the counterclockwise direction. Hoisting lever 23A-1
The spring levers 18A-1 and 18A-2, which pivot and lock the worm wheel 23 and the pin, have the same rotating shaft 18A-5. Since it is on the shaft, as the winding lever 23A-1 rotates counterclockwise,
While compressing the spring 19, spring lever 18A-1
and 18A-2 continue to rotate. Therefore, while the drive roller 18A-3 is detached from the drive element 15A,
It rotates counterclockwise about the rotating shaft 18A-5, and the centers of the rotating shaft 18A-5, the pin 18A-4, and the pin 19-2 of the fixed side support point of the spring 19 are aligned on a straight line. Reach dead center.

When the rotation of the worm wheel 23 passes the dead center described above, the spring 19 is released and the spring lever 18A-
1 and 18A-2 are further rapidly rotated counterclockwise by the spring force, and the drive roller 18A-3 comes into contact with the other contact surface 15A-2 of the drive element 15A.
Here, the drive roller 18A-3 directly transmits the spring force to the drive element 15A and rotates the output lever 9 connected to the drive element counterclockwise. The movable contact 3 is pulled up and removed from the fixed contact 2 to open the circuit.

When the movable contact 3 reaches the open position, the driver 15
A comes into contact with the open-circuit side stopper 11 and stops rotating, and the force of the spring 19 constantly pushes the driver 15A via the drive roller 18A-3, so that the open position is maintained.

In a transient state in which the drive roller 18A-3 is separated from the driver 15A, a toggle spring 24 may be provided so that the driver 15A can maintain its original position.

In the above embodiment, the drive roller, which is directly attached to the spring lever that transmits the spring force as a regulated rotational motion, comes into contact with the driver connected to the movable contact and transmits the force, so the following advantages are achieved. bring.

1 The radius of the part that comes into contact with the driver is sufficiently large,
Since the spring force is hardly increased, the contact pressure can be suppressed. Therefore, it is possible to avoid uneconomical measures such as using particularly high-grade materials for the contact surface portion.

2. The drive roller that comes into contact with the drive element has the shape of a rotating body and is easily machined, and by appropriately selecting the roller diameter, the pressing surface pressure can be easily and appropriately alleviated, contributing to improved robustness.

3. The shape of the driver may be a flat plate and is easy to process.

4. Since the spring lever can be arranged so as to sandwich the driver, it is possible to avoid a cantilevered load in transmitting the spring force, preventing changes in the effective pressure-receiving surface due to deflection, and preventing inconveniences such as an increase in surface pressure. can be avoided.

5. Machining accuracy can be improved because the shapes of component parts can be simplified. Furthermore, since the radius of the motion transmission point is large, it is convenient to prevent machining errors from being magnified and maintain performance.

6 Compared to the conventional example shown in Fig. 1, the types and number of parts can be reduced, the shape is simplified,
Furthermore, since the strength of the member can be reduced by preventing the transmission force from expanding, it greatly contributes to the overall economic efficiency.

As described in detail above, the present invention has the effect of providing a simple, robust, and economical spring operating device for a switch suitable for a large output type.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a conventional device, and FIG. 2 is an exploded perspective view showing an embodiment of the present invention. 1... Switch, 12A... Output lever shaft, 15
A...driver, 18A-1, 18A-2...spring lever, 18A-3...drive roller.

Claims (1)

[Claims for Utility Model Registration] Two spring levers that transmit spring force as regulated rotational motion, and a drive roller supported between the spring levers at one end of the spring levers. a driver having an open-circuit side contact surface and a closed-circuit side contact surface that are in contact with the drive roller on its outer peripheral surface; A spring operating device for a switch, comprising: an output lever shaft that supports and is connected to the switch.