JPH0730423U - Manual switch operation mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve safety by preventing the movable contact from stopping midway when opening the switch. [Structure] The lever 23 connected to the handle 1 pivotally supports a rod 6 by pins 4 and 5 parallel to the handle shaft 2 at both ends. A compression coil spring 7 is fitted on the outside of the rod 6, and an end portion of the rod 6 is inserted into a sliding hole formed in a pin 8 and slidably supported. A drive plate 21 connected to a drive shaft 10 for driving the main contact 9 is rotatably fitted to the other end of the handle shaft 2. A pin 22 is projectingly provided at an end portion of the drive plate 21 located on the pin 5 side and extended outward, and a tension coil spring 24 is stretched between the pin 22 and the pin 5. The tension coil spring 24 is set so as to be stretched most at the rotational position where the main contact 9 and the fixed contact 15 come into contact with and separate from each other, and supplements the snap action when the main contact 9 rotates.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a manual operation mechanism for a switch such as an air switch for a pole.

[0002]

[Prior art]

 A conventional manual operating mechanism for a pillar-mounted air switch is configured as shown in FIGS. 8 and 9. In the figure, reference numeral 1 is a handle for operation, and when the handle 1 is manually rotated, a pair of front and rear levers 3 is rotated via a handle shaft 2 to which the handle 1 is fixed. The lever 3 pivotally supports rods 6 and 6 by pins 4 and 5 at both ends. The rods 6 and 6 have compression coil springs 7 and 7 fitted on their outer sides, and their ends are slidably supported by being inserted into pins 8 and 8 having sliding holes. 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 so that the drive plate 11 and the lever 3 are connected. A return spring 12 is interposed between the two. A recess 11a is formed on the outer peripheral portion of the drive plate 11, and the pin 4 is engaged therein. The clockwise rotation of the drive plate 11 is stopped by the stopper 14 as shown in FIG. Further, the counterclockwise rotation of the lever 3 is stopped by the stopper 13 after being largely rotated from the position shown in FIG.

In this 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 rotated counterclockwise to open the main contact 9, the lever 3 pushes the rod 6 outward and compresses the coil spring 7, as shown in FIG. Move. At this time, the drive plate 11 remains in contact with the stopper 14. Further, when the handle 1 is rotated counterclockwise, the pin 4 comes into contact with the end of the recess 11a formed on the outer periphery of the drive plate 11, and as shown in FIG. 11, the drive plate 11 and the drive shaft 10 are rotated. Rotate clockwise. As a result, as shown in FIG. 12, the main contact 9 is removed from the fixed contact 15 and opened.

When the main contact 9 comes out of the fixed contact 15, the main contact 9 and the drive plate 11 are further rotated counterclockwise by the bending force of the return spring 12 as shown in FIG. Further, when the handle 1 of the lever 3 is further rotated and the rod 6 passes an angle (dead point) where the rod 6 forms a straight line on the horizontal axis as shown in FIG. 14, the restoring force of the coil spring 7 causes counterclockwise rotation. It is strongly rotated.

[0006]

[Problems to be solved by the device]

 However, in the above-described conventional manual operation mechanism, when the main contact 9 is pulled out from the fixed contact 15 and separated from the fixed contact 15, the rotation of the handle 1 is directly transmitted to the drive plate 11 to rotate the drive shaft 10. As a result, the main contact 9 comes out of the fixed contact 15. Therefore, if the handle operation is stopped immediately before or immediately after the main contact 9 comes out of the fixed contact 15, that position will be maintained. As a result, if there is a slight misalignment of the positions of the main contacts of the three phases, there will be both open and closed phases.

[0007] Thus, if the operation handle can be stopped at the intermediate position during the manual opening operation, it may cause an open phase accident or an electric shock accident during hot line construction. There was a problem. The present invention has been made to solve the above problems, and an object thereof is to improve safety by preventing the movable contact from stopping midway when manually opening the switch. It is to provide a manual operation mechanism for a switch.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention connects a pair of rods in a radial direction to both ends of a lever whose center is fixed to a handle shaft through pins parallel to the handle shaft, and connects both rods with a coil spring. And a snap mechanism that pushes in the direction of the pin by a pin, a recess that is pivotally supported by the handle shaft in the vicinity of the lever and that engages with one pin of the lever is formed on the outer peripheral part, and is connected to the drive shaft of the movable contact. In the manual operation mechanism of the switch equipped with the drive plate, the tension coil spring is stretched between the pin at one end of the lever and the locking portion formed on the drive plate outside this pin. To collect.

[0009]

[Action]

 According to the present invention, when the handle shaft is rotated to switch the contact from the closed state to the open state, the lever starts rotating while compressing the coil spring prior to the drive plate as the handle shaft rotates. The tension coil spring stretched between the pin at one end of the lever and the engaging portion formed on the drive plate at a position outside the pin is also stretched.

Further, when the handle shaft rotates and the movable contact is separated from the fixed contact even at only one phase at the intermediate position of the snap mechanism, the resistance due to the rotation is reduced and the tension of the tension coil spring is reduced. Greater than dynamic resistance. As a result, the drive plate is strongly rotated in the forward direction by the tension coil bar, and the movable contacts of the remaining phases are instantly disconnected from the fixed contacts. Then, the drive plate is rotated to the final stop position following the rotation of the lever.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is an explanatory view showing the construction of an embodiment of a manual operation mechanism for a switch according to the present invention, and FIG. 2 is a transverse sectional view of FIG. In both figures, 1 is a handle for operation, and when the handle 1 is manually rotated, a lever 23 composed of two front and rear wheels is rotated via a handle shaft 2 to which the handle 1 is fixed. Let The lever 23 pivotally supports the rod 6 at both ends by 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 portion of the rod 6 is inserted into a pin 8 having a sliding hole and is slidably supported. A drive plate 21 connected to a drive shaft 10 that drives 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 part is projectedly provided at the end thereof, and a tension coil spring 24 is stretched between the pin 22 and the pin 5. It is set up. The lever 23, the pins 4, 5, 22, the rod 6, the coil springs 7, 24, and the like form a snap mechanism that holds the main contact 9 at either the open or closed operation end position.

A recess 21 a is formed in the outer peripheral portion of the other end of the drive plate 21, and the pin 4 is engaged therein. Further, one end side of the drive plate 21 is bent in parallel to the drive shaft 10 side via a step portion in order to secure a storage space for the coil spring 24. The clockwise rotation of the drive plate 21 is restricted by the stopper 14, and the counterclockwise rotation of the lever 23 is restricted 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 rotated counterclockwise in an attempt to open the main contact 9 from the fixed contact 15, the lever 23 pushes the rod 6 to compress the coil spring 7. While rotating. The drive plate 21 is pulled by the lever 23 via the coil spring 24 as the rotation of the lever 23 progresses. However, since the main contact 9 of the drive plate 21 driven via the drive shaft 10 is attached to the fixed contact 15, a sliding resistance is generated, and the drive plate 21 is stopped during the beginning when the tension of the coil spring 24 is small. It is still done. During this time, the coil panel 24 extends 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 comes into contact with the end of the recess 21 a formed on the outer periphery of the drive plate 21. Further, when the handle 1 is rotated counterclockwise, as shown in FIG. 5, the drive plate 21 and the drive shaft 10 are directly moved counterclockwise from the pin 4 of the lever 23 through the contact portion with the recess 21a. Torque is transmitted. The main contact 9 to which the torque has been transmitted by the drive shaft 10 tries to come out from the fixed contact 15, but the drive plate 21 is not rotated due to the sliding resistance with the fixed contact 15, and remains stopped.

Next, when the drive plate 21 rotates and the main contact 9 of any one phase first comes out of the fixed contact 15, the sliding resistance applied to the drive plate 21 until then is equivalent to one phase. The counterclockwise torque applied to the drive plate 21 by the spring force of the coil spring 24 becomes larger than the sliding resistance, and the counterclockwise rotation of the drive plate 21 is started.

FIG. 6 shows a state immediately after the drive plate 21 is momentarily rotated. The drive plate 21 is rotated along with the contraction of the coil spring 24, and the drive plate 21 is rotated prior to the lever 23 until it comes into contact with the pin 4 at the rear end of the recess 21a. 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, the turning resistance for compressing the coil panel 7 is lost, and the spring stored in the coil spring 7 is reversed. The force is released and the lever 23 is strongly rotated counterclockwise.

When the lever 23 rotates counterclockwise in this way, as shown in FIG. 7, when the drive plate 21, which rotates following the lever 23, comes into contact with the stopper 13, the lever 23 rotates. Movement is 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 project due to the spring force of the coil spring 7 to rotate the lever 23 and the drive plate 21 counterclockwise, so that the main contact 9 is stably held in the open state. . The opening operation is completed by a series of these operations.

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 portion of the drive plate 21. By this, even if the handle 1 is stopped during the opening / closing operation different from the normal position and one of the three-phase main contacts 9 comes out of the fixed contact 15, the spring accumulated in the coil spring 24 The main contact 9 is swung counterclockwise all at once by the force. As a result, it is possible to prevent the main contact 9 from being stopped and to be in the open phase state when only one phase or two phases are missing, and a reliable opening / closing operation is performed.

In other words, the sliding resistance generated when the main contact 9 is rotated is reduced by that amount 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 in the counterclockwise direction, and the main contacts 9 also instantly pull out from the fixed contacts 15 for the remaining two phases. 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 satisfy the following equation. Sliding resistance for three phases> Accumulated spring force of coil spring 24> Sliding resistance for two phases

In this way, the bypass switch for exchanging transformers according to the embodiment can prevent an open phase accident that has occurred due to the main contact 9 stopping at the intermediate position, and can be used during live line construction. It is possible to prevent electric shock accidents and improve safety. Further, the coil spring 24, which is a feature of the present invention, is simpler in structure, easier to design, manufacture and assemble than the conventional return spring 12 shown in FIGS. 8 and 9, and the cost is reduced accordingly. There is an advantage.

[0022]

[Effect of device]

 As described above, according to the present invention, the tension coil spring is stretched between the pin at one end of the lever and the drive plate located outside the pin, whereby the handle shaft is rotated and the contact is closed. When any one-phase contact is disconnected first at approximately the middle position of the snap mechanism when switching from the open state to the open state, the drive plate is forcibly rotated in the forward direction, and the remaining contacts also disconnect. Be done. This ensures that the movable contacts of all phases are pulled out from the fixed contacts. As a result, even if the manual opening operation is stopped halfway, the open phase accident in which only one phase or two phases of the movable contact is opened in the minute section before and after opening is resolved, and live line construction is performed. The safety in case of is improved.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of FIG.

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

FIG. 4 is an operation explanatory diagram 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 an operation explanatory diagram of a conventional example.

[Explanation 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 Recess 22 Pin 23 Lever 24 Tension Coil Spring

Claims (1)

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