JP2900396B2 - Member connection structure and movable contact plate structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member connecting structure for connecting metal substrates and a shaft, and a movable contact plate structure.

[Conventional technology]

Such a member coupling structure and a movable contact plate structure will be described in relation to a movable contact plate structure of a circuit breaker.

That is, the circuit breaker forcibly opens the contacts when an overcurrent state such as a short-circuit current or an overload current is detected, and performs circuit interruption.

When the contacts are opened in this overcurrent state, an arc current is generated between the separated contacts, and the circuit may not be cut off unless the arc current is cut off.

Therefore, a configuration is adopted in which the arc voltage is increased by extending and narrowing the arc current using an arc-extinguishing grid, a magnetic yoke, or the like, and the arc current is quickly extinguished to interrupt the circuit.

However, in order to use an arc-extinguishing grid or a magnetic yoke, it is necessary to provide a sufficient space for the arc-extinguishing grid or the magnetic yoke. This makes it difficult to perform rapid arc extinguishing, and in some cases, an arc current may exist between the contacts for a long time.

In this state, the arc current continues to flow while a large arc voltage is present, so that the thermal energy between the contacts increases, and this thermal energy causes a problem such as melting of the contacts and poor insulation around the contact device.

Therefore, as means for surely shutting off the circuit even when sufficient space cannot be secured as described above, FIGS.
As shown in FIG. 19, a circuit breaker has been proposed.

The configuration of the circuit breaker except for the contact device 1 is the same as that described in Japanese Patent Application No. 63-73708, and a power supply terminal device 3 and a load terminal device 4 are provided on both sides of the body 2 for each pole. And a contact device 1 for each pole arranged on the power supply side terminal device 3 side and a load side terminal device 4 side for detecting an overcurrent such as a short-circuit current or an overload current flowing through the contact device 1. The overcurrent detection device 5 for each pole and the operation of the operating handle 6 protruding from the upper surface of the body 2 are driven to open and close the contact device 1 and operate when the contact device 1 is in the closed state. An opening / closing mechanism section 7 for driving each pole in conjunction with each other for forcibly opening the contact device 1 in response to the current detection device 5 is housed.

The contact device 1 has a power source terminal device 3 on one side.
A fixed contact plate 8 made of a conductive material such as silver or a silver alloy having a higher arc resistance than the fixed contact plate 8 is attached to a fixed contact plate 8 made of a conductive material such as copper or a copper alloy. The fixed contacts 9 are fixed, and only the fixed contacts 9 are protruded to cover the surface with an insulating plate 10 to reduce the consumption of the fixed contacts 9.

In addition, an exhaust barrier 11 is provided on the fixed contact 9 side of the terminal device 3.
And an exhaust plate 12 and an insulator 13, and on the other side,
A U-shaped arc barrier 14 into which the tip of the insulating plate 13 is fitted is provided.
The movable contact plate 16 is connected to the first contact.

The movable contact plate 16 is made of a conductive material such as copper or a copper alloy, and has a movable contact 17 made of a conductive material such as silver or a silver alloy having a higher arc resistance than the movable contact plate 16 on one lower surface. Are fixed facing the fixed contact 9,
An electrode plate 18 made of a conductive material such as iron, stainless steel or the like having a higher melting temperature than the movable contact body 16 is provided in a state of being close to or in contact with the movable contact 17.

The positional relationship between the movable contact 17 and the electrode plate 18 with respect to the fixed contact 9 is determined by the movable contact
With the opening operation of 16, the separation distance between the fixed contact 9 and the electrode plate 18 is reversed to be smaller than the separation distance between the fixed contact 9 and the movable contact 17.

The movable contact plate 16 is provided with a pivot shaft 19 at the center thereof and is rotatable on each pole interlocking insulator cross bar 21 which is acted on by the opening and closing mechanism 7 and rotates about the rotation shaft 20. Is held.

Further, a spring receiving pin 22 is provided at the other end of the movable contact plate 16, and a spring 23 is contracted between the movable bar and the cross bar 21. When the overcurrent occurs, the contact point is opened by reversing clockwise by the electromagnetic repulsive force, and the contact is returned to the original position as the crossbar 21 rotates.

The arc extinguishing operation of the contact device 1 is performed when an overcurrent flows between the contacts 9 and 17 in a state as shown in FIG. 19A where the contacts 9 and 17 are closed, as shown in FIG. 19B. Movable contact plate 16 with repulsive force
The arc current I flows between the contacts 9 and 17 at the same time as the movable contact 17 is separated from the fixed contact 9 by being reversed by the relationship between the contact 9 and the spring 23.

This arc current I spreads in the direction of the electrode plate 18 in which the separation distance gradually decreases as the opening of the movable contact plate 16 itself progresses, and extends over a wide range from the movable contact 17 to the electrode plate 18. An arc current I flows.

The arc voltage at this time does not increase sufficiently due to the spread of the arc current I, and the arc current I
And the arc voltage, that is, the thermal energy generated in the space is suppressed.

Further, as shown in FIG. 19 (c), the crossbar 21 starts rotating with the opening operation of the opening / closing mechanism 7, and the crossbar 21
With the rotation of, the rotating contact plate 16 comes into contact with the jump-up preventing piece 24 and is reversed to the original counterclockwise state, so that the contact is opened as shown in FIG. 19D and the current becomes substantially zero. Then, the arc current I disappears and the circuit is cut off.

The arc gas generated by the heat energy in this space pushes the exhaust barrier 11 outward by the gas pressure, and is discharged to the outside through the exhaust holes of the exhaust plate 12.

The arc extinguishing operation of the contact device 1 has been described in the state in which the movable contact plate 16 is reversed. However, depending on the magnitude of the current flowing between the contacts 9 and 17, the movable contact plate 16 does not reverse. The arc current I as described above may flow between the contacts 9 and 17. In this case as well, the arc current I generated between the contacts 9 and 17 spreads in the direction of the current plate 18 and the arc current I flows in a wide range from the movable contact 17 to the electrode plate 18 as described above.

As described above, the proposed circuit breaker spreads the arc current I generated between the fixed contact 9 and the movable contact 17 to the electrode plate 18 mounted on the movable contact plate 16 to suppress the rise of the arc voltage. , By suppressing the generation of thermal energy generated by the product of the arc current I and waiting for the arc current I to reach a substantially zero position and extinguishing the arc current I, a sufficient space cannot be secured. Even in such a case, the circuit can be reliably shut off.

In the above circuit breaker, the movable contact plate
It became necessary to equip 16 with both an electrode plate 18 and a shaft 19.

First, when the movable contact plate 16 is provided with the electrode plate 18, that is, when a metal substrate is generally provided with a metal attachment plate, a method of welding and joining the joining surfaces, or a method of fitting and fitting to the joining portion A method of forming a portion and press-fitting the uneven portion is employed.

When the movable contact plate 16 is provided with the pivot shaft 19, that is, when the shaft is generally provided on a metal substrate,
The pivot shaft 19 is inserted into the through hole formed in the movable contact plate 16,
A method is employed in which either the metal substrate or the shaft is fixed by caulking.

[Problems to be solved by the invention]

However, as described above, when a metal substrate is provided with both a metal attachment plate and a shaft body, if the attachment plate connection work and the shaft body connection work are performed individually, both the connection work are performed. It is necessary and causes a decrease in workability.

In addition, if the metal substrate is equipped with a metal attachment plate by welding, the metal substrate is overheated by welding, and the metal substrate may be softened and the strength may be reduced. In particular, when the metal substrate is a movable contact plate, the deformation of the movable contact plate may adversely affect the contact pressure.

In addition, if the metal substrate is equipped with a metal accessory plate, and if the method of press-fitting and fitting the concave and convex portions is used, when the metal substrate or the metal accessory plate is subjected to strong stress, the press-fit engagement will loosen. When the metal substrate is a movable contact plate, the opening and closing impact of the movable contact plate is greatly affected, and the function of the movable contact plate may be adversely affected by the detachment.

The present invention has been made in view of the above circumstances, and an object of the present invention is to allow both a metal attachment plate and a shaft to be joined to a metal substrate by pressing and deforming a single substrate, and the metal substrate and the metal It is an object of the present invention to provide a member connecting structure and a movable contact plate structure in which a decrease in strength due to softening of an accessory plate is reduced, and the joining strength of a metal substrate and a metal accessory is improved.

[Means for solving the problem]

In order to solve such a problem, a member connecting structure according to claim (1) forms a metal in which a projection extending outward is formed and a through hole is formed at any position from within the projection to a position close to the projection. A board made of a metal, a metal attachment plate formed with an inwardly extending groove for fitting a projection of the board, and a shaft inserted into a through hole of the board, and pressing both sides of a through hole edge of the board. Deformed.

In the member connecting structure according to the second aspect, a metal substrate having a groove extending inward and having a through hole formed at a position close to the groove deviating from the groove is fitted into the groove of the substrate. A metal attachment plate with a projection that spreads outward,
And a shaft inserted into the through hole of the substrate, and both sides of the through hole edge of the substrate are pressed and deformed.

According to a third aspect of the present invention, the movable contact plate structure has a projection provided on one side provided with the movable contact opposed to the fixed contact, and a projection extending outwardly from the inside of the projection to a position close to the projection between the projections. A movable contact plate having a through hole formed at any one of the locations, and the distance between the fixed contact and the fixed contact is smaller than the separation distance between the fixed contact and the movable contact due to the opening operation of the movable contact plate. An electrode plate having an inwardly extending groove to be brought into or out of contact with the movable contact and into which a projection of the movable contact plate is fitted; and a movable contact holding shaft inserted into a through hole of the movable contact plate. The movable contact plate has a through-hole edge pressed and deformed.

In the movable contact plate structure according to claim (4), a groove extending inward is formed on one side provided with the movable contact opposed to the fixed contact, and a through hole is formed at a position close to the groove deviated from the groove. The movable contact plate and the distance between the fixed contact and the fixed contact are reversed to be smaller than the separation distance between the fixed contact and the movable contact with the opening operation of the movable contact plate so that the movable contact plate approaches or closes to the movable contact. An electrode plate having an outwardly extending projection that is brought into contact with and fitted into a groove of the movable contact plate; and a movable contact plate holding shaft inserted into a through hole of the movable contact plate. The edge of the through hole of the plate is pressed and deformed.

[Action]

In the member coupling structure according to the first aspect, the shaft body is firmly fixed by shrinking the through hole by pressing and deforming both sides of the edge of the through hole of the substrate, and pressing and deforming both sides of the edge of the through hole of the substrate. As a result, outward projections, that is, elongation in the direction of the protrusions are uniformly generated from both sides of the substrate to expand the protrusions.

In the member connecting structure according to the second aspect, the shaft body is firmly fixed by contraction of the through hole by pressing and deforming both sides of the through hole edge of the substrate, and also presses and deforms both sides of the through hole edge of the substrate. In this way, outward expansion, that is, expansion in the groove direction is uniformly generated from both sides of the substrate to expand the groove, and the contraction of the groove improves the close contact with the projection of the attachment plate, thereby enabling the attachment plate to be firmly connected.

According to a third aspect of the present invention, in the movable contact plate structure, the shaft body is firmly fixed by contraction of the through hole due to the pressing deformation of the through hole edge of the movable contact plate, and outwardly due to the pressing deformation of the through hole edge.
In other words, the protrusion is expanded in the direction of the protrusion to expand the protrusion,
The bulging of the projections improves the adhesion of the electrode plate to the groove, enables firm connection of the electrode plate, and provides a functionally effective movable contact plate structure.

According to a fourth aspect of the present invention, in the movable contact plate structure, the shaft body is firmly fixed by contraction of the through hole by pressing deformation of the through hole edge of the movable contact plate, and outwardly by pressing deformation of the through hole edge.
That is, the groove is shrunk by elongation in the groove direction, and the contraction of the groove improves the adhesion of the electrode plate to the protrusion, thereby firmly bonding the electrode plate, and a functionally effective movable contact plate structure. And can be.

〔Example〕

 Hereinafter, the present invention will be described based on examples.

FIGS. 1 to 4 show an example of a member connecting structure, in which a side 26 of a metal substrate 25 is formed such that an outer dimension L2 is larger than an inner dimension L1 and spreads outward. A projection 27 is formed, and a through hole 28 is formed at a position close to the projection 27 while the projection 27 is positioned with respect to one side 26. The position of the through-hole 28 may be within the projection 27, and may be any position as long as the through-hole 28 is formed anywhere within the projection 27 and between the projections 27 and close to the projection 27.

Further, a groove 31 is formed on one side 30 of the metal attachment plate 29 that is in contact with one side 26 of the metal substrate 25 so as to have an inner dimension L4 larger than the outer dimension L3 and expand inward.
The projection 27 of the metal substrate 25 is fitted into the metal substrate 25. The degree of this fitting is optimally the degree of press-fitting, but there may be some space.

In addition, the shaft 32 is inserted into the through hole 28 of the metal substrate 25, and the edge of the through hole 28 of the metal substrate 25 is pressed and deformed from both sides to form the pressing depression 33.

The joining procedure will now be described.
The projection 27 is inserted into the groove 31 of the metal attachment plate 29 and the shaft 32 is inserted into the through hole 28 of the metal substrate 25 to position the metal attachment plate 29 and the shaft 32 on the metal substrate 25. 4 (a) and 4 (b), from the state as shown in FIGS. 4 (a) and 4 (b), the edge of the through hole 28 is pressed and deformed from both sides to form a pressing depression 33.
Work as shown in

Thus, by forming the pressing depression 33, that is, by pressing and deforming both sides of the through hole edge 28 of the metal substrate 25,
The shaft body 32 is firmly fixed by the contraction of the through hole 28, and the outward direction, that is, the extension in the direction of the projection 27 is uniformly generated from both sides of the metal substrate 25, and the projection 27 is expanded, and the projection of the projection 27 is attached. The attachment of the plate 29 to the groove 31 of the plate 29 is improved.
Is firmly bonded.

Further, another embodiment having a different member coupling structure will be described with reference to FIGS. 5 and 8 and using the same reference numerals as those in the first embodiment. There is a difference in that the protrusion 27 and the groove 31 formed on the metal plate 25 and the metal attachment plate 29 are formed in a reverse direction, and the position of the through hole 33 of the shaft body 32 is set to a position close to the groove 31 which is disengaged from the groove 31. .

That is, a groove 31 is formed on one side 26 of the metal substrate 25 so as to have an inner dimension L6 larger than the outer dimension L5 and is formed so as to expand inward, and a groove deviated from the position of the groove 31 with respect to the one side 26.
A through hole 28 is formed at a position close to 31.

Further, a projection 27 is formed on one side 30 of the metal attachment plate 29 which is in contact with one side 26 of the metal substrate 25 so that the outside dimension L8 is larger than the inside dimension L7 and the projection 27 is shaped to spread outward. It is fitted in the groove 31.

7 (a) and 7 (b) in which the protrusion 27 of the metal attachment plate 29 is fitted into the groove 31 of the metal substrate 25, and the shaft 32 is inserted into the through hole 28 of the metal substrate 25 and positioned. ) From the state shown in FIG.
Is formed as shown in FIGS. 8A and 8B,
The shaft body 32 is firmly fixed by the contraction of the through hole 28, and the outward direction, that is, the extension in the direction of the groove 31 is uniformly generated from both sides of the substrate 25 to contract the groove 31, and the contraction of the groove 31 causes the attachment plate 29 to contract.
Of the attachment plate 29 is firmly attached to the projection 27 so that the attachment plate 29 is firmly connected.

Further, an embodiment of the movable contact plate structure to which the member connection structure described in the first embodiment is applied is described with reference to FIGS. 17 to 19 based on FIGS. 9 to 12. The same components as those in the technology will be described with the same reference numerals.

That is, a movable contact plate 16 is provided with a movable contact 17 facing a fixed contact (not shown), and a side 34 having an outer dimension L10 larger than an inner dimension L9 and having outwardly extending protrusions 35 is provided on two sides of a concave portion 36. Is formed.

Further, a through hole 37 is formed between the projections 35 at a position close to the projections 35. The position of this through hole 37 is
The projection 35 may be located between the projection 35 and the projection 35.
What is necessary is just to form it somewhere up to the position close to 35.

Moreover, with the opening operation of the movable contact plate 16, the distance between the fixed contact (not shown) and the fixed contact (not shown) is reversed to be smaller than the separation distance between the fixed contact (not shown) and the movable contact 17. On one side of the electrode plate 18 close to or in contact with the movable contact 17, two grooves 39 of the movable contact plate 16 are formed with a groove 39 having an inner dimension L12 larger than the outer dimension L11 and extending inward.
Two projections 40 are formed to fit into the groove 36, and the projection 35 of the movable contact plate 16 is fitted into the groove 39. The degree of this fitting is optimally the degree of press-fitting, but there may be some space.

Also, a through hole 37 of the movable contact plate 16 has a shaft body for holding the contact plate 16.
19 is inserted, and the edge of the through hole 37 of the movable contact plate 16 is pressed and deformed from both sides to form a pressing depression 41.

The connection procedure will now be described.
The projection 35 is fitted into the groove 39 of the electrode plate 18 and the movable contact plate
The shaft 19 is inserted into the through hole 37 of the electrode plate 16 and the electrode plate 18 is inserted into the movable contact plate 16.
From the state as shown in FIGS. 11 (a) and (b) in which the shaft body 19 is positioned, the edge of the through hole 37 is deformed by pressing from both sides to form a pressing depression 41, and the pressing recess 41 is formed as shown in FIGS. 12 (a) and (b). Process as shown.

12 (a) and 12 (b), the movable contact 17 is placed on the contact mounting seat 42 formed at the tip of the movable contact plate 16, and the rear end of the movable contact 17 is placed at the tip of the electrode plate 18. And the movable contact 17 is joined to the movable contact plate 16.

In addition, the braided wire 15 is spot-welded to the movable contact plate 16 and joined, and the spring receiving pin 22 is inserted and fixed in a through hole 43 formed in the movable contact plate 16.

Thus, the formation of the pressing depression 41, that is, the through hole
Due to the pressing deformation of the 37 edge, the shaft body 19 is firmly fixed by the contraction of the through hole 37, and outwardly, that is, the projection 35 is expanded by expanding in the direction of the projection 35, and the swelling of the projection 35 causes the electrode plate to expand. The electrode plate 18
Are firmly connected to each other, thereby providing a functionally effective movable contact plate structure.

Further, another embodiment having a different movable contact plate structure to which the member coupling structure described in the second embodiment is applied is the same as the above-described embodiment of the movable contact plate structure based on FIGS. 13 to 16. Explaining using symbols, the above-described embodiment is different from the movable contact plate.
There is a difference in that the protrusion 35 and the groove 39 formed on the electrode plate 16 and the electrode plate 18 are formed in reverse, and the position of the through hole 37 of the shaft body 19 is a position close to the groove 39 deviated from the groove 39.

That is, the groove 3 is formed on one side 34 of the movable contact plate 16 such that the inner dimension L14 is larger than the outer dimension L13 so as to expand inward.
9 is formed, and a through hole 37 is formed at a position close to the groove 39 that is deviated from the position of the groove 39 with respect to one side 34.

Further, the electrode plate 18 in contact with one side 34 of the movable contact plate 16
On one side 38, a projection 35 is formed having a shape that is larger than the inner dimension L15 and is larger than the inner dimension L15 and is spread outward.
In the groove 39.

A concave portion 44 is formed in the movable contact plate 16 to prevent the back of the electrode plate 18 from rising, and a protrusion 45 is inserted into the electrode plate 18.
Is formed.

Thus, the protrusion 35 of the electrode plate 18 is fitted into the groove 39 of the movable contact plate 16 and the shaft 19 is inserted and positioned in the through hole 37 of the movable contact plate 16 in FIGS. From such a state,
The edge of the through hole 37 is deformed by pressing from both sides to form the pressing dent 41
By forming them as shown in FIGS.
Is firmly fixed by the contraction of the through hole 37, and the groove 39 is contracted by outwardly extending, that is, elongation in the direction of the groove 39.
The contraction of 39 improves the adhesion of the electrode plate 18 to the projection 35, thereby firmly connecting the electrode plate 18, and the subsequent steps are the same as in the above-described embodiment of the movable contact plate structure.

In all the embodiments described above, the depressions 41 are formed on both surfaces of the substrate 25 or the movable contact plate 16, but may be formed on one side. In addition, the proximity of the through holes 28 and 37 to the protrusions 27 and 35 or the grooves 31 and 36 of the present invention indicates a distance affected by expansion and contraction due to pressing deformation of the edges of the through holes 28 and 37.

〔The invention's effect〕

Since the member connecting structure and the movable contact plate structure of the present invention are configured as described above, the following effects are obtained.

In the member coupling structure according to the present invention, the shaft body is firmly fixed by shrinking the through hole by pressing and deforming both sides of the through hole edge of the substrate, and by pressing and deforming both sides of the through hole edge. The protrusions are expanded outwardly, that is, in the direction of the protrusions uniformly from both sides of the substrate, and the protrusions are swelled, and the swelling of the protrusions improves the tightness of the attachment plate to the groove, thereby firmly connecting the attachment plate. By pressing and deforming the two substrates, both the metal attachment plate and the shaft body can be connected to the metal substrate, reducing the strength reduction due to heating and softening of the metal substrate and the metal attachment plate, and reducing the strength of the metal substrate and the metal attachment plate Can be improved.

In the member connecting structure according to the second aspect, the shaft body is firmly fixed by contraction of the through hole by pressing and deforming both sides of the through hole edge of the substrate, and also presses and deforms both sides of the through hole edge of the substrate. In this way, outward expansion, that is, in the direction of the protrusion, is uniformly generated from both sides of the substrate to expand the groove, and the expansion of the groove improves the close contact with the protrusion of the accessory plate and enables the attachment plate to be firmly connected. 1. The metal substrate and the shaft can be connected to the metal substrate by pressing and deforming one substrate, reducing the strength reduction due to the heating and softening of the metal substrate and the metal substrate. The attachment strength of the attachment plate can be improved.

According to a third aspect of the present invention, in the movable contact plate structure, the shaft body is firmly fixed by contraction of the through hole due to the pressing deformation of the through hole edge of the movable contact plate, and outwardly due to the pressing deformation of the through hole edge.
In other words, the protrusion is expanded in the direction of the protrusion to expand the protrusion,
The bulge of the projections improves the adhesion of the electrode plate to the groove, and allows the electrode plate to be firmly bonded. By pressing and deforming one movable contact plate, both the electrode plate and the shaft are attached to the movable contact plate. Can be connected, deformation of the movable contact plate that adversely affects the contact pressure due to softening by heating can be reduced, and the strength of the connection between the movable contact plate and the electrode plate can be improved, and dropping due to opening and closing impact of the movable contact plate can be reduced. A functionally effective movable contact plate structure can be obtained.

According to a fourth aspect of the present invention, in the movable contact plate structure, the shaft body is firmly fixed by contraction of the through hole by pressing deformation of the through hole edge of the movable contact plate, and outwardly by pressing deformation of the through hole edge.
That is, the groove is shrunk by elongation in the groove direction, and the contraction of the groove improves the adhesion of the electrode plate to the projection, thereby firmly bonding the electrode plate. Both the electrode plate and the shaft can be connected to the movable contact plate by deformation, and the deformation of the movable contact plate that adversely affects the contact pressure due to softening by heating can be reduced, and the coupling strength between the movable contact plate and the electrode plate can be improved. As a result, the movable contact plate can be prevented from falling off due to the opening / closing impact, and a functionally effective movable contact plate structure can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of a member connecting structure of the present invention, FIG. 2 is an exploded perspective view of the member connecting structure of FIG. 1, and FIGS. 4A and 4B are front views and AA cross-sectional views of the member-coupling structure of FIG. 1 before press-deformation, and FIGS. 4A and 4B are cross-sectional views of the member-coupling structure of FIG. FIG. 5 is a perspective view of a main part showing another embodiment of the member connecting structure of the present invention, FIG. 6 is an exploded perspective view of the member connecting structure of FIG. 5, and FIGS. 7 (a) and (b). 8 is a front view and a sectional view taken along the line BB of the member connecting structure of FIG. 5 before pressing deformation. FIGS. 8A and 8B are front views and B-B of the member connecting structure of FIG. 5 after pressing deformation. B sectional view, FIG. 9 is a perspective view showing one embodiment of the movable contact plate structure of the present invention, FIG. 10 is an exploded perspective view of the movable contact plate structure of FIG. 9, FIG. 11 (a) and (b) ) Is Fig. 9 FIG. 12 (a) and (b) are front views and CC cross-sectional views of the movable contact plate structure after pressing deformation of the movable contact plate structure of FIG. 9 before pressing deformation. FIG. 13 is a perspective view showing another embodiment of the movable contact plate structure of the present invention, and FIG. 14 is an exploded perspective view of the movable contact plate structure of FIG. 13, and FIGS. 15 (a) and (b). 13 is a front view and a sectional view taken along the line DD of FIG. 13 before the movable contact plate structure is deformed, and FIGS. 16A and 16B are front views and D-D of FIG. 13 after the movable contact plate structure is deformed. FIG. FIG. 17 is a cross-sectional front view of a conventional circuit breaker to which the movable contact plate structure of the present invention can be applied, FIG. 18 is a cross-sectional perspective view of a main part of the contact device of FIG. 17, and FIG. 17) to (d) are cross-sectional front views showing each progress of the arc extinguishing action of the contact device of FIG. DESCRIPTION OF SYMBOLS 1 ... Contact device, 2 ... Body, 3,4 ... Terminal device, 5 ... Overcurrent detection device, 6 ... Handle, 7 ... Opening / closing mechanism part, 8 ... Fixed contact plate, 9 ... Fixed contact, 15 ... Braided wire, 16… Movable contact plate, 17
… Movable contacts, 18… electrode plate, 19… shaft, 25… metal substrate,
27 ... projection, 28 ... through hole, 29 ... metal attachment plate, 31 ... groove, 32
... Shaft, 33 ... Pressing depression, 35 ... Protrusion, 37 ... Through hole, 39 ...
Groove, 41: depression, I: arc current.

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Akinobu Asada 1048 Oaza Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works Co., Ltd. (56) References JP-A-56-154218 (JP, A) JP-A-54-9352 (JP, A) JP-A-60-255220 (JP, A) Jikken Sho 43-14983 (JP, Y1) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) B21D 39/00 B21D 39/03 H01H 9/38 H01H 73/18

Claims (4)

(57) [Claims] 1. A metal substrate having a projection extending outward and having a through-hole formed at any position from inside the projection to a position close to the projection, and extending inward to fit the projection of the substrate. A member coupling structure comprising a metal attachment plate having a groove formed therein and a shaft inserted into the through hole of the substrate, and pressing and deforming both sides of the edge of the through hole of the substrate. 2. A metal substrate in which a groove extending inward is formed and a through hole is formed at a position close to the groove deviating from the groove, and a projection expanding outward fitting into the groove of the substrate is formed. A member coupling structure comprising a metal attachment plate and a shaft inserted into a through hole of the substrate, and pressing and deforming both sides of a through hole edge of the substrate. 3. A projection provided on one side provided with a movable contact opposed to a fixed contact is formed with an outwardly extending projection, and a through hole is formed in any of the projections from the projection to a position adjacent to the projection between the projections. The distance between the formed movable contact plate and the fixed contact side is reversed to be smaller than the separation distance between the fixed contact and the movable contact plate in accordance with the opening operation of the movable contact plate. The movable contact plate comprises an electrode plate having an inwardly extending groove for fitting with the projection of the movable contact plate, and a movable contact holding shaft inserted into a through hole of the movable contact plate. A movable contact plate structure in which the edge of the through hole is deformed by pressing. 4. A movable contact plate having a groove extending inward on one side provided with a movable contact opposed to a fixed contact and having a through hole formed at a position close to the groove deviating from the groove.
Along with the opening operation of the movable contact plate, the distance between the fixed contact and the movable contact is reversed to be smaller than the separation distance between the fixed contact and the movable contact so as to approach or contact the movable contact, and An electrode plate having an outwardly extending projection fitted into a groove of the movable contact plate; and a movable contact plate holding shaft inserted into a through hole of the movable contact plate. A movable contact plate structure that is deformed by pressing.