JP2520519B2 - Neutral 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 neutral switch incorporated in a neutral switch device for a distribution board.

[0002]

2. Description of the Related Art As shown in FIG. 10, a generally used neutral switch device for a distribution board is provided with a plurality of neutral switches 2, 2 ... On both sides of a conductor 1 having an opening at an intermediate position. The neutral pole bus 3 and the conducting band 1 are connected by arranging the plate nut 6 on the lower side of the conducting band 1 so that the threaded portion fits into the opening of the neutral pole bus 3. Further, the screw 4 which is inserted through the opening of the neutral pole bus 3 is screwed to the screw portion of the plate nut 6.

To attach the neutral switch device for the distribution board to the distribution board body, the outside of the neutral switch 2 located on both sides of the neutral switch device for the distribution board arranged at a predetermined position with respect to the distribution board body. And it is necessary to fix the inside with a fixture 12 provided separately. As shown in FIG. 11, the neutral switch 2 has a knob 9 pivotally attached to a shaft 8 provided on an upper portion of the terminal base 7.
A contact plate 10 arranged below the terminal plate inside the terminal base 7 and connected to the conductor 1 by the spring, and arranged between the knob 9 and the contact plate 10. The contact plate 10 is configured to have a movable piece 11 that moves in a direction away from the terminal plate and the neutral conductor 1, and by rotating the knob 9, the movable piece 11 is moved in the vertical direction and is biased by a spring. The contact plate 10 is adapted to come into contact with and separate from the terminal plate and the conductor 1.

[0004]

In the neutral switch of the above-mentioned type, it is necessary to make the spring piece formed on the knob elastically abut against the terminal base, so that the molding accuracy of the knob must be increased. There is a limit to reducing the cost. Moreover, in the assembling work, the knob and the movable piece must be aligned with each other, and the contact plate may fall off when the knob is moved in the ON state. The present invention has been made in view of the above points, and an object of the present invention is to provide a neutral switch that simplifies the assembly work and reduces the cost.

[0005]

A neutral switch according to the present invention comprises a knob pivotally attached to a shaft provided in an upper portion of a terminal base, and a terminal base equipped with a conductor to which a neutral pole bus is connected. , A contact plate that is arranged below the terminal plate inside the terminal base and that is spring-biased in the upward direction that connects the terminal plate and the neutral pole bus, and a contact plate that is arranged between the knob and the contact plate. In a neutral switch having a movable shaft moved in a direction away from the neutral pole bus, a locking projection is provided on one side of the shaft of the terminal base and a support is provided on the other side, and the movable shaft has a short portion and a long portion. The whole shape consisting of the parts is substantially L-shaped, a spring piece integrally extending in the opposite direction to the long part is provided in the short part, and the end of the long part serves as the terminal base between the knob and the contact plate. Shake on the provided support Is rotatably supported, the spring piece provided on a short section is configured by arranging to engage the engaging convex portion provided on the terminal base.

Further, the neutral switch of the present invention is
The neutral switch is characterized in that a drop-out preventing portion is provided so as to surround a side portion of the contact plate that abuts an end portion of a short portion of the movable shaft.

[0007]

In the neutral switch of the present invention, the movable shaft whose overall shape is substantially L-shaped is swingably supported by the supporting portion provided on the terminal base at the end of the long portion of the movable shaft. The spring piece extending in the opposite direction to the long portion integrated with the short portion is engaged with the locking convex portion provided on the terminal base, so that the substantially L-shaped movable shaft having elastic force moves up and down with the supporting portion as a fulcrum. As a result, the substantially L-shaped movable shaft presses the knob pivotally attached to the upper portion of the terminal base, eliminates rattling of the pivotally attached knob, and simplifies the assembly work of the entire apparatus to reduce the cost. .

Further, since the drop-out preventing portion is provided so as to surround the side portion of the contact plate that abuts against the end portion of the short portion of the movable shaft, the spring bias from the neutral switch is provided when the single piece is conveyed. It is possible to prevent the contact plate from coming off.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a front view of a neutral switch device for a distribution board, which is incorporated in a neutral switch 2 according to the present invention. In FIG. 1, reference numeral 20 indicates a support base formed of an electrically insulating plastic material, and the support base 20 is located below the middle portion of the conducting band 1 in which a plurality of neutral switches 2, 2 ... It is located on the side.

As shown in FIGS. 2 to 4, the support base 20 has a support face 21 for the conducting band 1 on the upper surface thereof and a nut receiving space 22 formed in the center of the support face 21. 23, side walls 25 and 25 integrally formed with openings 24 through which the conducting band 1 is connected to the support surface 21 and extending upward on both sides of the support base body 23, and a nut receiving space of the support base body 23. 22 and a side wall 25 located on both sides of the support base body 23 and having a nut 26 embedded therein, the outer surface 25a of the side wall 25 is a neutral switch in which the outer surface 25a is lined on both sides of the conducting band 1. Is set so as to abut against the inner side surface 2a of the neutral switch 2 located on the innermost side.

To attach the neutral switch device for the distribution board to the cabinet type distribution board, a nut 26 is provided at the center.
A support base 20 having a side wall 25 provided with openings 24 through which the conductors are fixed is provided on both sides, and two rows of neutral switches are provided below the conductor 1 having a plurality of neutral switches 2 arranged on both sides. Between the two, the opening 24 is arranged so as to be on the same line as the opening of the neutral switch 2. Then, the conductor 1 is inserted from the neutral switch 2 arranged on one side to the neutral switch 2 arranged on the other side through the opening 24 provided in the side walls 25, 25 of the support base 20,
The opening provided in the conducting band 1 is located so as to fit with the nut 26 embedded in the nut accommodating space 22 of the support base 20. Next, the opening of the neutral pole bus 3 is aligned with the opening provided in the conductor 1, and the screw 4 is screwed onto the nut 26 from above the neutral pole 3 through the neutral pole 3 and the conductor 1. By. In this case, the outer surface 25a of the side wall 25 of the support base 20 is the inner side surface 2 of the neutral switch 2 located on the innermost side of the neutral switches arranged on both sides of the conducting band 1.
Since it comes into contact with a, it is not necessary to provide a fixture inside the neutral switch 2.

When the neutral switch device for the distribution board is arranged in the cabinet type distribution board, as shown in FIG.
The neutral switch device 30 for the distribution board is arranged so as to have a spatial distance L with respect to the agreement type breaker 31 arranged in proximity. The space distance L is set by connecting a spacer provided between the adjacent neutral switches 2 and 2 and a corresponding agreement breaker 31 with a connecting wire 32. In this case, in order to make the overall shape compact, it is necessary to reduce the spatial distance L in order to reduce the size of the cabinet type distribution board. Since reducing the space distance L makes it difficult to secure the electrical insulation of the electric device, the insulating cover 33 is fixedly provided on the surface of the neutral switch 2 arranged in a row facing the agreement breaker 31. The insulating cover 33 is formed, for example, by forming a plate made of an electrically insulating material into a substantially U shape and providing engaging portions on both side portions. The insulating cover 33 is fixed to the agreement breaker 31 by fixing it to the insulating cover 33. This is performed by engaging the engaging portion provided on the reference numeral 33 with the engaging convex portion provided on the side wall of the neutral switch 2. The insulating cover 33 is arranged so as to cover at least the surface of the neutral switch 2 facing the breaker 31. That is, the insulating cover 33 is arranged so as to cover a portion that can secure a standard insulating distance between the terminal charging portion of the breaker and the conductor inserted in the neutral switch.

FIG. 6 is a diagram showing a state in which the neutral switch 2 according to the present invention is in the switch-on position. Compared with the conventional neutral switch 2 shown in FIG. 11, this neutral switch 2 has the same structure of the terminal base 7 and the contact plate 10 disposed below the inside of the terminal base 7, but The structure of the knob 40 pivotally attached to the upper portion of the table 7 is different from the structure of the movable shaft 41 arranged between the knob 40 and the spring-biased contact plate 10. That is, the movable shaft 41, which is a characteristic portion of the neutral switch 2, has a short portion 42 as shown in FIG.
a main body portion 42 having a substantially L-shaped overall shape including a and a long portion 42b, and a fitting recess 43 for fitting the contact plate 10 provided at the end of the short portion 42a of the main body portion 42. , The support surface 44 of the knob 40 provided on the long portion 42b of the body portion 42 and the short portion 4 of the body portion 42.
Spring piece 4 extending from 2a in the direction opposite to the long portion 42b
5 and 5. The fitting recess 43 provided at the end of the short portion 42a of the movable shaft 41 is formed by a drop-prevention portion formed so as to surround the side portion of the contact plate, and the contact plate 10 is guided by the drop-prevention portion. It

The movable shaft 41 is, as shown in FIG. 6, a knob 4 pivotally attached to a shaft 8 provided on an upper portion of the terminal base 7.
The short portion 42a of the main body portion 42 is vertically positioned in the space 46 formed between the 0 and the contact plate 10, and the long portion 42b of the main body portion 42 is mounted in the horizontal direction. In this case, the end of the long portion 42b of the main body portion 42 of the movable shaft 41 is supported on the support portion 47 of the terminal base 7. Further, a spring piece 45 extending from the short portion 42a of the main body portion 42 in the direction opposite to the laterally long portion 42b is provided.
It engages with the upper portion of the convex portion 48 provided on the terminal base 7.

In order to assemble the neutral switch shown in FIG. 6, first, the short portion 42 of the movable shaft 41 is first assembled.
The contact plate 10 should be fitted into the fitting recess 43 provided at the lower end of a, and the movable shaft 41 fitted with the contact plate 10 should be formed between the knob 40 of the terminal base 7 and the contact plate 10. In the space 46, the end of the long portion 42b of the main body portion 42 is supported on the support portion 47 of the terminal base 7, and the spring piece extending from the short portion 42a of the main body portion 42 in the direction opposite to the laterally long portion 42b. The terminal 45 is mounted so that it engages with the upper portion of the convex portion 48 provided on the terminal base 7. Then, the knob 40 is pivotally attached to the shaft 8 provided on the upper portion of the terminal base 7. By pivotally attaching the knob 40 to the shaft 8, the space 46 is
The movable shaft 41 attached to is pushed down. Thereby, an upward elastic force with the support portion 47 as a fulcrum acts on the end of the long portion 42b of the main body portion 42 of the movable shaft 41,
The knob 40 pivotally attached to the shaft 8 does not rattle.

In the neutral switch 2 in the switch-on position shown in FIG. 6, a coil spring acts on the contact plate 10, the contact plate 10 is pressed upward, and the contact provided on the contact plate 10 is connected to the conducting band 1. are doing. In this state, when the knob 40 pivotally attached is rotated counterclockwise in FIG. 6, the neutral switch becomes the switch-off position shown in FIG.

In the neutral switch 2 in the switch-off position shown in FIG. 7, the movable shaft 41 is pushed downward with the support portion 47 as a fulcrum by the rotation of the knob 40, and the contact plate 10 on which the coil spring acts is coiled. The contact of the contact plate 10 is moved away from the conducting band 1 against the elastic force of the spring. At this time, the laterally extending spring piece 45 provided on the movable shaft 41 rides over the convex portion 48 provided on the terminal base 7 and is positioned below the convex portion 48. This spring piece 45 serves as a resistance against the movement of the movable shaft 41 when returning from the switch-off position of FIG. 7 to the switch-on position shown in FIG.

[0018]

As described above, in the neutral switch of the present invention, the movable shaft whose overall shape is substantially L-shaped swings on the support portion provided with the end of the long portion of the movable shaft on the terminal base. A substantially L-shaped movable shaft having elastic force by freely supporting and engaging a spring piece extending in the opposite direction of the long part integral with the short part of the movable shaft to a locking projection provided on the terminal base. Moves up and down with the support portion as a fulcrum, whereby the substantially L-shaped movable shaft presses the knob pivotally attached to the upper portion of the terminal base, eliminating rattling of the pivotally attached knob, and assembling the entire apparatus. Make work easier and lower costs. In addition, since the dropout prevention part is provided so as to surround the side part of the contact plate that abuts the end of the short part of the movable shaft, the spring-biased contact from the neutral switch can be used when the product is transported as a single item. It is possible to prevent the boards from popping out.

[Brief description of drawings]

FIG. 1 is a front view of a neutral switch device for a distribution board in which a neutral switch of the present invention is incorporated.

FIG. 2 is a plan view of a support base incorporated in the neutral switch device for a distribution board of FIG.

3 is a sectional view taken along line 3-3 of FIG.

4 is a cross-sectional view taken along line 4-4 of FIG.

5 is a diagram showing a modification of the neutral switch device for a distribution board of FIG. 1. FIG.

FIG. 6 is a diagram showing a switch-on position of the neutral switch of the present invention.

FIG. 7 is a diagram showing a switch-off position of the neutral switch of the present invention.

FIG. 8 is a diagram showing a movable shaft incorporated in the neutral switch of the present invention.

FIG. 9 is a plan view of a conventional neutral switch device for a distribution board.

FIG. 10 is a front view of a conventional neutral switch device for a distribution board.

FIG. 11 is a diagram showing a conventional neutral switch.

[Explanation of symbols]

 1 Conduction band 2 Neutral switch 3 Neutral pole bus 10 Contact plate 20 Support stand 24 Opening 25 Side wall 26 Nut 33 Insulation cover 40 Knob 41 Movable shaft 45 Spring piece 48 Convex part

Claims (2)

(57) [Claims] 1. A terminal base mounted with a knob pivotally mounted on a shaft provided in an upper portion of the terminal base, a conductor connecting a neutral pole bus, and a terminal plate inside the terminal base. Which has a contact plate which is disposed on the side and which connects the terminal plate and the conductor to the spring, and which has a movable shaft which is arranged between the knob and the contact plate and moves the contact plate away from the terminal plate and the conductor. In the switch, a locking projection is provided on one side of the shaft of the terminal base and a support is provided on the other side of the terminal base, and the overall shape of the movable shaft is a substantially L-shape with a short portion and a long portion. A spring piece extending in the opposite direction to the long part is integrally provided, and the end of the long part is swingably supported by the supporting part provided on the terminal base between the knob and the contact plate of the movable shaft, and the short part is attached to the short part. The spring piece provided on the terminal base Neutral switch, characterized in that arranged to engage the protrusion. 2. The neutral switch according to claim 1, wherein a drop-out preventing portion is provided so as to surround a side portion of the contact plate that abuts an end portion of a short portion of the movable shaft.