JP2592797Y2 - Manual operation mechanism of switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual operation mechanism in a switch such as a pole air switch.

[0002]

2. Description of the Related Art A conventional manual operating mechanism of a pole air switch is constructed as shown in FIGS. In the figure, reference numeral 1 denotes an operating handle, and when the handle 1 is manually turned, the pair of front and rear levers 3 is turned via a handle shaft 2 to which the handle 1 is fixed. The lever 3 supports the rods 6 and 6 with pins 4 and 5 at both ends. The rods 6, 6 have compression coil springs 7, 7 fitted on the outside, and the ends are inserted through pins 8, 8 having sliding holes to be slidably supported. The lever 3, the pins 4, 5, the rod 6, and the coil spring 7 form a snap mechanism.

A drive plate 11 connected to a drive shaft 10 for driving a main contact (movable contact) 9 is rotatably fitted to the other end of the handle shaft 2, and the drive plate 11 and the lever 3
A return spring 12 is interposed therebetween. A recess 11a is formed in the outer peripheral portion of the driving plate 11, and the pin 4 is engaged therein. The clockwise rotation of the driving plate 11 is stopped by the stopper 14 as shown in FIG. Further, the rotation of the lever 3 in the counterclockwise direction is stopped by the stopper 13 after being largely rotated from the position shown in FIG.

In the manual operation mechanism, when the main contact 9 is opened, the operation is performed as shown in FIGS. That is, when the handle 1 is manually turned counterclockwise to open the main contact 9, the lever 3 pushes the rod 6 outward and rotates while compressing the coil spring 7, as shown in FIG. . At this time, the driving plate 11 is
4 remains in contact. Further, when the handle 1 is rotated in the counterclockwise direction, the pin 4 comes into contact with the end of the concave portion 11a formed on the outer periphery of the driving plate 11, and as shown in FIG.
The drive plate 11 and the drive shaft 10 are rotated counterclockwise. As a result, as shown in FIG. 12, the main contact 9 comes off from the fixed contact 15 and is opened.

When the main contact 9 comes off from the fixed contact 15, the main contact 9 and the driving plate 11 are further rotated counterclockwise by the spring force of the return spring 12, as shown in FIG.
Also, as for the lever 3, the handle 1 is further rotated,
As shown in FIG. 4, when the rod 6 passes through an angle (dead center) where the rod 6 is aligned on a horizontal axis, the rod 6 is strongly rotated counterclockwise by the restoring force of the coil spring 7.

[0006]

However, in the above-mentioned conventional manual operation mechanism, the rotation of the handle 1 is transmitted directly to the drive plate 11 during the opening operation in which the main contact 9 is removed from the fixed contact 15 and separated therefrom. By rotating the drive shaft 10, the main contact 9 comes off from the fixed contact 15. Therefore, if the operation of the steering wheel is stopped immediately before or immediately after the main contact 9 comes off from the fixed contact 15, that position is maintained. As a result, if there is even a slight irregularity in the position of each of the three-phase main contacts, both the open phase and the closed phase remain.

As described above, if the operation handle can be stopped at the intermediate position of the operation handle at the time of manual opening operation, a phase loss accident or an electric shock accident at the time of live-line construction is caused. was there. The present invention has been made in order to solve the above problems, and an object thereof is to improve safety by preventing a movable contact from stopping halfway when a switch is opened by a manual operation. An object of the present invention is to provide a manual operation mechanism of a switch.

[0008]

In order to achieve the above object, the present invention provides a pair of rods at both ends of a lever whose center is fixed to a handle shaft, via pins parallel to the handle shaft. A snap mechanism that connects the two rods in the directions and presses both rods in the direction of the pins with a coil spring, and a concave portion that is supported by the handle shaft in the vicinity of the lever and is engaged with one of the pins of the lever is formed in the outer peripheral portion; In a manual operation mechanism of a switch having a driving plate connected to a driving shaft of a movable contact, a pin at one end of a lever and a locking portion formed on a driving plate located outside the pin. It is characterized in that a tension coil spring is stretched.

[0009]

In the present invention, when the handle shaft is turned to switch the contact from the closed state to the open state, the lever starts rotating while compressing the coil spring ahead of the drive plate together with the rotation of the handle shaft. The tension coil spring stretched between the pin at one end of the lever and the locking portion formed on the drive plate at a position outside the pin is also extended.

Further, when the handle shaft is rotated and the movable contact is separated from the fixed contact even in one phase at substantially the intermediate position of the snap mechanism, the resistance associated with the rotation is reduced and the tension of the tension coil spring is rotated. It becomes larger than resistance. As a result, the driving plate is strongly rotated in the forward direction by the tension coil spring, and the movable contacts of the remaining phases are instantaneously disconnected from the fixed contacts. Next, the drive plate follows the rotation of the lever,
It is rotated to the final stop position.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing a configuration of an embodiment of a manual operation mechanism of a switch according to the present invention, and FIG. 2 is a cross-sectional view of FIG. In both figures, reference numeral 1 denotes an operating handle, and when the handle 1 is manually rotated, a lever 23 consisting of two front and rear levers is rotated via a handle shaft 2 to which the handle 1 is fixed. . The lever 23 supports the rod 6 at both ends with pins 4 and 5 parallel to the handle shaft 2.

A compression coil spring 7 is fitted on the outside of the rod 6, and an end of the rod 6 is inserted through a pin 8 having a sliding hole and is slidably supported. A drive plate 21 connected to a drive shaft 10 for driving a main contact (movable contact) 9 is rotatably fitted to the other end of the handle shaft 2. One end of the drive plate 21 located on the pin 5 side is extended outward, and a pin 22 which is a locking portion is protruded from the end thereof, and a tension coil spring 24 is stretched between the pin 22 and the pin 5. Has been established. The lever 23, the pins 4, 5, 22, the rod 6, and the coil springs 7, 24 form a snap mechanism for holding the main contact 9 at an open or closed operation end position.

A recess 21a is formed in the outer peripheral portion at the other end of the driving plate
Is formed and the pin 4 is engaged therein. Also,
One end of the drive plate 21 is bent in parallel to the drive shaft 10 via a step to secure a storage space for the coil spring 24. The clockwise rotation of the drive plate 21 is limited by the stopper 14, and the counterclockwise rotation of the lever 23 is limited by the stopper 13. In this embodiment, when the main contact 9 is opened by these manual operation mechanisms, the operation is performed as shown in FIGS.

That is, as shown in FIG. 3, when the handle 1 is manually turned counterclockwise to open the main contact 9 from the fixed contact 15, the lever 23 pushes the rod 6 to compress the coil spring 7. Rotate while rotating.
The driving plate 21 is pulled by the lever 23 via the coil spring 24 as the rotation of the lever 23 proceeds. But,
Since the main contact 9 driven via the drive shaft 10 is clamped by the fixed contact 15, the driving plate 21 generates sliding resistance, and the driving plate 21 remains stopped while the tension of the coil spring 24 is low. It is. During this time, the coil spring 24 is extended according to the tension from the drive plate 21, and the applied tension is stored as a spring force.

Next, as shown in FIG. 4, when the handle 1 is continuously rotated counterclockwise, the pin 4 of the lever 23 is rotated.
Abuts on an end of a concave portion 21 a formed on the outer periphery of the driving plate 21. When the handle 1 is further rotated in the counterclockwise direction, as shown in FIG. 5, the drive plate 21 and the drive shaft 10 are directly moved from the pin 4 of the lever 23 to the drive plate 21 and the drive shaft 10 through the contact portion with the recess 21a. Is transmitted. The main contact 9 to which the torque is transmitted by the drive shaft 10 tries to escape from the fixed contact 15, but the driving plate 21 remains stopped without being rotated due to sliding resistance with the fixed contact 15.

Next, when the rotation of the drive plate 21 advances and any one-phase main contact 9 first comes off the fixed contact 15, the sliding resistance applied to the drive plate 21 until then decreases by one phase. Then, the counterclockwise torque given to the driving plate 21 by the spring force of the coil spring 24 becomes larger than the sliding resistance, and the driving plate 21 starts rotating counterclockwise.

FIG. 6 shows a state immediately after the driving plate 21 is momentarily rotated. The drive plate 21 is rotated together with the contraction of the coil spring 24, and the drive plate 21 is rotated prior to the lever 23 until the rear end of the recess 21a contacts the pin 4. When the lever 23 is further turned by the turning operation of the handle 1 and the pins 4 and 5 pass through the dead center, there is no turning resistance for compressing the coil spring 7, and conversely, the spring force stored in the coil spring 7 Is released and the lever 23
Is strongly rotated counterclockwise.

When the lever 23 rotates counterclockwise in this way, as shown in FIG. 7, the lever 23 rotates at a position where the drive plate 21 that rotates following the lever 23 contacts the stopper 13. Will be blocked. At the same time, with the rotation of the drive plate 21, the main contact 9 is also largely rotated counterclockwise and stopped. Even after the stop, the rod 6 tries to further protrude by the spring force of the coil spring 7 and tries to rotate the lever 23 and the driving plate 21 counterclockwise.
Is stably held in the open state. With a series of these operations, the opening operation ends.

As described above, in the manual operation mechanism of the embodiment, the coil spring 24 is stretched between the pin 5 of the lever 23 and the pin 22 projecting from the outer end of the driving plate 21.
Even if the handle 1 is stopped during opening / closing operation different from the normal position due to an operation error or the like, and even one of the three-phase main contacts 9 is detached from the fixed contact 15, it is accumulated in the coil spring 24. Due to the applied spring force, the main contact 9 is turned at once in a counterclockwise direction. As a result, the main contact 9 is stopped in a state where only one phase or two phases are disconnected and a phase loss is prevented, and a reliable switching operation is performed.

In other words, the sliding resistance generated when the main contact 9 is rotated decreases when any one-phase main contact 9 comes out of the fixed contact 15 first. Therefore, the counterclockwise torque applied to the drive plate 21 by the spring force accumulated in the coil spring 24 relatively exceeds the value of the sliding resistance. As a result, the drive plate 21 starts to rotate counterclockwise, and the main contacts 9 are instantaneously applied to the remaining two phases.
Escapes from the fixed contact 15. In order to realize these snap operations, it is necessary that the spring force accumulated in the coil spring 24 and the sliding resistance between the fixed contact 15 and the main contact 9 have the following relationship. Sliding resistance for three phases>
Cumulative spring force of coil spring 24> sliding resistance for two phases

In this manner, the transformer switching bypass switch of the embodiment can prevent an open-phase accident that has occurred because the main contact 9 stops at the intermediate position, and can prevent an electric shock accident in live-line construction. Can be prevented and safety can be improved. In addition, the coil spring 24 which is a feature of the present invention.
Compared with the return spring 12 of the conventional example shown in FIGS. 8 and 9, the structure is simple, so that design, manufacture and assembly are easy, and there is an advantage that the cost is reduced accordingly.

[0022]

As described above, according to the present invention, the handle shaft is rotated by extending the tension coil spring between the pin at one end of the lever and the driving plate located outside the pin. When the contacts are switched from the closed state to the open state, if any one-phase contact is disconnected first at a substantially intermediate position of the snap mechanism, the driving plate is forcibly rotated in the forward direction, and the remaining contacts are rotated. Is also separated subsequently. Thereby, the movable contacts of all phases are reliably extracted from the fixed contacts. As a result, even if the manual opening operation is stopped halfway, the open-phase accident in which only one or two phases of the movable contact are opened in a minute section before and after the opening is eliminated, and hot-line work is performed. In this case, safety is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an embodiment according to the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is an operation explanatory diagram of the embodiment.

FIG. 4 is a diagram illustrating the operation of the embodiment.

FIG. 5 is an operation explanatory diagram of the embodiment.

FIG. 6 is an operation explanatory diagram of the embodiment.

FIG. 7 is an operation explanatory diagram of the embodiment.

FIG. 8 is an explanatory diagram showing a conventional example.

FIG. 9 is an explanatory diagram showing a conventional example.

FIG. 10 is an operation explanatory diagram of a conventional example.

FIG. 11 is an operation explanatory diagram of a conventional example.

FIG. 12 is an operation explanatory diagram of a conventional example.

FIG. 13 is an operation explanatory diagram of a conventional example.

FIG. 14 is a diagram illustrating the operation of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handle 2 Handle shaft 4, 5 pin 6 Rod 7 Compression coil spring 8 Pin 9 Main contact 10 Drive shaft 13, 14 Stopper 15 Fixed contact 21 Drive plate 21a Depression 22 Pin 23 Lever 24 Tension coil spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of rods are radially connected to both ends of a lever whose center is fixed to a handle shaft via pins parallel to the handle shaft, and both rods are pressed in the direction of the pins by a compression coil spring. And a drive plate which is supported by the handle shaft in the vicinity of the lever, has a recess formed in the outer periphery where one pin of the lever is engaged, and is connected to the drive shaft of the movable contact. Wherein a tension coil spring is stretched between a pin at one end of a lever and a locking portion formed on a driving plate at a position outside of the pin in the manual operation mechanism of the switch. Operation mechanism.