JP4180817B2 - Electrical switch contactor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a contact used for a contact portion of an electrical switch such as a circuit breaker.
[0002]
[Prior art]
FIG. 7 is a side view showing a contact of a conventional electric switch, for example, a circuit breaker. In the figure, 11 is a finger, 12 is a tube, 13 is a spring, 14 is a fixed conductor, 15 is a split pin, 16 is a nut, 17 is a bolt, and 18 is a washer.
[0003]
A hole is formed in the vicinity of the tip of the fixed conductor 14, and the tube 12 is installed so as to penetrate the hole. Two fingers 11 are arranged so as to sandwich the tube 12 and the fixed conductor 14, and are fixed by bolts 17, nuts 16, and washers 18 via springs 13.
In the opening / closing operation of the electric switch, when the movable conductor is inserted between the two fingers 11, the two fingers 11 are opened, and between the finger 11 and the inserted movable conductor and between the finger 11 and the fixed conductor 14, It is the structure which contacts by obtaining the contact pressure in each contact point with a load, and satisfy | fills electricity supply performance.
[0004]
[Problems to be solved by the invention]
The contact of the conventional electric switch has a problem in that the spring 13 is disposed outside the finger 11 and there is a limit in reducing the outer dimension. In addition, there is a problem in that both the contact portion and the fastening portion have a large number of parts, and much time is required for assembly.
[0005]
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an electrical switch contactor capable of reducing the external dimensions and reducing the number of parts.
[0006]
[Means for Solving the Problems]
The contact of the electric switch according to the present invention is made of a conductive material having a spring property and is integrally formed in a substantially U-shaped cross section, and the outer surface of the central portion is formed in the U-shaped central portion. A fastening means for fastening so as to come into contact with the fixed conductor, and an outer surface of the central portion that comes into contact with the fixed conductor is formed in a curved shape that forms a convex arc, and the fastening means is formed in the center Centering on the contact portion of the part, the U-shaped end part can be swung through the fixed conductor and a spring so as to be able to swing, and the movable conductor inserted between the end parts can be inserted and removed. Each of the end portions presses the movable conductor with the movable conductor inserted between the end portions.
[0007]
Each of the end portions has a plurality of fingers divided in a direction perpendicular to the U-shaped cross section.
[0008]
Moreover, each of the front-end | tip part of the said finger | toe comprises the convex shape which protrudes in the said edge part side which opposes.
[0009]
The U-shaped central portion is extended in both directions perpendicular to the U-shaped cross section, and the fixed conductor and each of the extended portions are fastened through the spring. it is characterized in that the.
[0012]
In addition, an inner surface that does not contact the fixed conductor at the center of the U-shape has a flat shape.
[0013]
Further, a spacer having a flat shape on the surface in contact with the spring is provided between the spring and the extending portion.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a perspective view showing a contact of an electric switch according to Embodiment 1 of the present invention. In FIG. 1, 1 is a contact having a substantially U-shaped cross section, and 2 is an end of a U-shaped. The provided fingers, 3 is a U-shaped central portion, 3a is an outer surface of the central portion 3, and 3b is an inner surface of the central portion 3.
[0015]
The contact 1 in this embodiment is integrally manufactured by, for example, pressing a conductive material having a spring property such as C19400 so that the cross-sectional shape is substantially U-shaped. A movable conductor (not shown) can be inserted and removed between the U-shaped end portions, and each end portion is a movable conductor due to the spring property of the contact 1 itself with the movable conductor inserted between the end portions. Has a pressing force in the direction. For this reason, the current-carrying performance between the movable conductor and the contact 1 can be sufficiently obtained.
[0016]
Furthermore, in the contact 1 according to this embodiment, a plurality of fingers 2 divided in a direction perpendicular to the U-shaped cross section are formed at each of the U-shaped end portions. In other words, slit processing is performed to form a plurality of fingers 2. When the movable conductor is inserted between the fingers 2 from the U-shaped opening end, a contact pressure is generated in the direction of the movable conductor due to the spring property of the fingers 2 itself. For example, even if a finger 2 out of a plurality of fingers 2 divided for some reason is not pressed against the movable conductor, the energization performance can be maintained by the other finger 2, so that the reliability can be improved. In addition, the tip of the finger 2 has a convex shape that protrudes smoothly toward the opposite end, and is further bent to open outward at the tip. For this reason, the movable conductor can be smoothly inserted between the fingers 2 and the movable conductor and the fingers 2 are reliably in contact with each other. In addition, since the plurality of fingers 2 are formed by performing slit processing, the contact points with respect to the inserted movable conductor increase, and the contact pressure per contact point can be reduced. Also, the overall contact pressure (equal to the force required to insert the movable conductor) can be reduced. Further, since the surface area of the entire contact 1 is increased, the heat radiation area is increased, and the temperature rise of the contact 1 can be suppressed.
[0017]
Next, a fixing method and electrical connection between the contact and the fixed conductor in the first embodiment will be described. FIG. 2 is a perspective view showing a state when the contact 1 shown in FIG. 1 is fixed to a fixed conductor. In the figure, 4 is a metal fitting, 5 is a bolt, and 6 is a washer. These are fixing means for fixing the contact 1 to a fixed conductor (not shown).
The outer surface 3a of the central part of the contact 1 is brought into contact with the fixed conductor, and as shown in FIG. 2, the direction perpendicular to the U-shaped cross section is inside the U-shaped central part of the contact 1 The metal fitting 4 is arrange | positioned so that it may penetrate. Holes are provided at both ends of the metal fitting 4, and bolts 5 are inserted into the respective holes via washers 6 and fastened, and the contact 1 is fastened to the fixed conductor. Here, since the outer surface 3a of the center part of the contact 1 is brought into surface contact with the fixed conductor by fastening the bolt 5 with a specified torque, the energization performance between the fixed conductor and the contact 1 is sufficient. Can get to.
[0018]
As described above, in this embodiment, the contact 1 is integrally formed of a conductive material having a spring property. For this reason, if a movable conductor is inserted between the fingers 2, the finger 2 will generate a pressing force with respect to a movable conductor by the bending | flexion and spring property of itself, and will satisfy | fill electricity supply performance. Further, the contactor 1 and the fixed conductor can sufficiently obtain energization performance by surface contact on the outer surface 3a of the central portion. In the conventional contact, a spring for obtaining the contact pressure provided outside the contact is required, but the contact according to this embodiment is not necessary. Therefore, compared with the conventional contact, the external dimension of the whole contact part can be reduced significantly. Moreover, since the contact 1 is comprised integrally, the number of parts can be reduced and an assembly can be simplified. Furthermore, since the contact 1 itself can be manufactured only by pressing, it can be manufactured at low cost.
[0019]
Embodiment 2. FIG.
FIG. 3 is a perspective view showing a contact of an electric switch according to Embodiment 2 of the present invention, in which 7a and 7b are extending portions and 8 is a hole. Moreover, in each part, the same code | symbol is attached | subjected to FIG. 1 and an equivalent part, and the description is abbreviate | omitted.
As in the first embodiment, the contact 1 shown in FIG. 3 is integrally manufactured by, for example, pressing a conductive material having a spring property such as C19400 so that the cross-sectional shape is substantially U-shaped. Has been.
Further, the outer surface 3a of the central portion 3 of the U-shaped cross section is formed by a curved surface, and the cross section has a curved shape that forms a convex arc outward. Further, the central portion 3 is formed in a shape provided with extending portions 7a and 7b by extending in both directions perpendicular to the U-shaped cross section. Each of the extending portions 7a and 7b is provided with a through hole 8 as a fixing means when fastened to a fixed conductor (not shown). The inner surface 3b that does not contact the fixed conductor of the U-shaped central portion 3 is processed into a flat shape by, for example, pressing. FIG. 4 shows a side view of FIG. Since the outer surface 3 a of the central portion 3 is formed of a curved surface, it is in line contact with the fixed conductor 21.
[0020]
As in the first embodiment, by integrally forming with a conductive material having a spring property, each of the fingers 2 applies a pressing force in the direction of the inserted movable conductor (not shown) by the spring property of the contact 1 itself. Have. For this reason, the current-carrying performance between the movable conductor and the contact 1 can be sufficiently obtained.
[0021]
FIG. 5 is a perspective view showing a state when the contact 1 shown in FIG. 3 is fixed to a fixed conductor. In the figure, 9 is a spring inserted between the inner surface 3b of the center part of the contact and the washer 6.
The outer surface 3a of the central portion 3 of the contact 1 is brought into contact with the fixed conductor, and the bolt 5 is inserted into the hole 8 formed in the extending portions 7a and 7b via the spring 9 and the washer 6 and fastened. The contact 1 is fastened to the conductor. The outer surface 3a of the central portion 3 is a convex arc whose cross-sectional shape is convex outward, and the contact 1 is in line contact with the fixed conductor. In this embodiment, since each of the extending portions 7a and 7b is fastened to the fixed conductor, the contact 1 is surely in line contact with the fixed conductor, and the contact between the fixed conductor and the contact 1 is assured. Energization performance can be secured.
[0022]
Furthermore, the extending portions 7a and 7b are provided with holes 8 and fastened, so that the metal fitting 4 required in the first embodiment is not necessary, and the number of parts required for fastening can be reduced. Further, since assembly is easy and adjustment is not required, the assembly time can be shortened, resulting in a reduction in price.
In this embodiment, for example, the extending portions 7a and 7b extend only the central portion 3 of the U-shaped cross section in the direction perpendicular to the cross section, and when fastened to the fixed conductor by a fixing means such as a bolt 5, the fingers It is the structure which the part of 2 is easy to fasten without getting in the way.
[0023]
Further, by connecting the contact 1 via the spring 9, the contact 1 has a U-shaped cross-sectional direction centered on the line contact portion of the central portion 3 of the U-shaped cross section with the fixed conductor. The head can be swung at a certain angle. When the movable conductor is inserted from the tip of the finger 2, if it is inserted with a slight deviation from the central axis of the contact 1, the contact 1 can be directed in the direction in which the movable conductor is inserted by the swinging motion. A movable conductor can be inserted between the opposing fingers 2 of the contact 1. Furthermore, since the contactor 1 is configured to be able to swing, it is possible to ease the assembly accuracy of devices such as circuit breakers and switch gears to be inserted, thereby shortening the assembly time and quality as an electrical switch. Can be improved.
[0024]
Further, since the surface that contacts the spring 9 when the contact 1 is fastened to the fixed conductor, that is, the inner surface 3b of the central portion is flat, the spring load is applied to the central portion 3 evenly. Even the outer surface 3a of 3 has a uniform force and performs a stable swinging motion. Since the angle of the swing motion is determined by the radius of curvature of the arc of the outer surface 3a of the central portion 3, it may be determined in consideration of the error of the insertion angle of the movable conductor to be inserted.
[0025]
FIG. 6 is a perspective view showing a state in which the contact 1 in which the inner surface 3b of the central portion 3 is formed with the same curved surface as the outer surface 3a is fixed to a fixed conductor. In the figure, 10 is a spacer, and the surface on the side in contact with the spring 9 has a flat shape. When the inner surface 3b of the central portion 3 of the contact 1 is a curved surface, the spring load is equally applied to the central portion 3 by inserting the spacer 10 between the spring 9 and the contact 1 as shown in the figure. It can be configured as follows.
In order to form the inner surface 3b that does not come into contact with the U-shaped center fixed conductor so as to have a flat shape, for example, a process such as pressing is required. Therefore, if the spacer 10 is inserted without increasing the number of steps, the spring load can be evenly applied to the central portion 3 and the manufacturing procedure can be simplified.
[0026]
As described above, also in this embodiment, as in the first embodiment, the outer dimensions of the entire contact portion can be greatly reduced by integrally configuring the contact 1 with a conductive material having a spring property. Moreover, since the contact 1 is comprised integrally, the number of parts can be reduced and an assembly can be simplified. Furthermore, since the contact 1 itself can be manufactured only by pressing, it can be manufactured at low cost. In addition, the energization performance can be maintained by configuring the plurality of fingers 2 to contact the movable conductor.
Furthermore, the number of parts required for fastening can be reduced by providing holes 8 in the extending portions 7a and 7b and fastening them. Further, since assembly is easy and adjustment is not required, the assembly time can be shortened, resulting in a reduction in price.
Furthermore, the contact 1 can be swung, which has the effect of shortening assembly time and improving quality.
[0027]
In the first and second embodiments, the fixing means is configured by the washer 6, the bolt 5 and the hole 8. However, the fixing means is not limited to this, and may be fixed by another member. In addition, although C19400 is used as a conductive material having a spring property, the present invention is not limited to this, and any other conductive material having a spring property and having a substantially U-shaped cross section may be used.
[0028]
【The invention's effect】
As described above, according to the contact of the electric switch of the present invention, the cross-sectional shape is integrally formed in a substantially U-shaped conductive material having a spring property, Fastening means for fastening so as to be in contact with the fixed conductor on the outer surface of the central portion, the outer surface of the central portion that is in contact with the fixed conductor is formed in a curved shape that forms a convex arc, The fastening means is a movable part that fastens the U-shaped end portion through the fixed conductor and a spring so as to be able to swing around the contact portion of the central portion, and is inserted between the end portions. a removably conductors, since the respective said end portion in a state in which the movable conductor is inserted between said end portions, characterized in that to press the movable conductor, the entire contact portion as compared with the conventional contact The external dimensions of the contactor can be greatly reduced, and the number of parts of the contact can be reduced. Furthermore, since assembly is easy and adjustment is not required, the assembly time can be shortened, the contact can be configured to swing, and a contact that allows easy insertion of a movable conductor can be obtained, resulting in cost reduction. There is a connected effect.
[0029]
In addition, since each of the end portions has a plurality of fingers divided in a direction perpendicular to the U-shaped cross section, good energization performance can be maintained. Moreover, the contact point with respect to the movable conductor inserted increases, the contact pressure per contact point can be reduced, and the whole contact pressure can also be reduced. Furthermore, since the surface area of the whole contact increases, the heat radiation area increases, and the temperature rise of the contact can be suppressed.
[0030]
Further, each of the tip portions of the fingers has a convex shape that protrudes toward the opposite end portion, so that the movable conductor can be easily inserted and a contact that reliably contacts the movable conductor is obtained. .
[0031]
The U-shaped central portion is provided with an extending portion extending in both directions perpendicular to the U-shaped cross section, and the fixed conductor and the extending portion are fastened through the spring . it is to said, since the set stand does not require easy adjustment, can reduce the assembly time, resulting in the effect of leading to cost reduction.
[0034]
In addition, the inner surface of the U-shaped central portion that does not contact the fixed conductor has a flat shape, so that the contact can be stably swung, and the movable conductor can be reliably secured. As a result, the assembly time can be shortened and the quality can be improved.
[0035]
Moreover, since the surface on the side in contact with the spring is provided with a spacer between the spring and the extending portion, the contact can be stably swung, By assuring that the movable conductor is inserted into the contact, the assembly time can be shortened and the quality can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a contact of an electric switch according to Embodiment 1 of the present invention.
FIG. 2 is a perspective view showing a state when the contact in Embodiment 1 is fixed to a fixed conductor.
FIG. 3 is a perspective view showing a contact of an electric switch according to Embodiment 2 of the present invention.
4 is a side view of FIG. 3. FIG.
FIG. 5 is a perspective view showing a state when the contact in the second embodiment is fixed to a fixed conductor.
FIG. 6 is a perspective view showing another example of a state when the contact in Embodiment 2 is fixed to a fixed conductor.
FIG. 7 is a side view showing a contact of a conventional electric switch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Contact 2 Finger 3 Central part 3a Outer surface 3a Central part 3b Inner surface 7a, 7b Central part Extension part 8 Hole 9 Spring 10 Spacer.

Claims (6)

Sectional shape with a conductive material having a spring property is formed integrally with substantially U-shape, the central portion shaped of the co and fastened in contact with the stationary conductor in the outer surface of the central portion fastening An outer surface contacting the fixed conductor in the central portion is formed in a curved shape that forms a convex arc, and the fastening means is centered on a portion in contact with the central portion. A state where the letter-shaped end portion is fastened through the fixed conductor and a spring so as to be able to swing, the movable conductor inserted between the end portions can be inserted and removed, and the movable conductor is inserted between the end portions And each of the end portions presses the movable conductor.   The contact of the electric switch according to claim 1, wherein each of the end portions has a plurality of fingers divided in a direction perpendicular to the U-shaped cross section.   The contact of the electric switch according to claim 2, wherein each of the tip portions of the fingers has a convex shape protruding toward the opposed end portions. An extending portion formed by extending the U-shaped central portion in both directions perpendicular to the U-shaped cross section, and fastening the fixed conductor and the extending portion through the spring. The contact of the electric switch of any one of Claims 1-3 characterized by these. The contact of the electric switch according to any one of claims 1 to 4, wherein an inner surface that does not contact the fixed conductor of the U-shaped central portion has a flat shape. Child. 5. A contact for an electric switch according to claim 4 , wherein a spacer having a flat shape on a surface in contact with the spring is provided between the spring and the extending portion.

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