JP4108181B2 - Circuit breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker, more specifically, a first terminal, a second terminal, a movable element that can contact the first terminal, and a conductor that connects the movable element and the second terminal. A support shaft that passes through the shaft hole of the mover and rotatably supports the mover so that the shaft can be displaced so that the movable contact of the mover can come into contact with the fixed contact of the first terminal. The present invention relates to a structure of a mover of a circuit breaker including a swinging mechanism section that swings and a resilient member for bringing a movable contact into contact with a fixed contact in a closed state.
[0002]
[Prior art]
An example of a conventional circuit breaker for wiring is shown in FIGS.
FIG. 14 is a side view showing an open circuit state disclosed in Japanese Patent Laid-Open No. 5-303930, FIG. 15 is a side view showing the closed circuit state, and FIG. 16 is a diagram showing a movable element and a first terminal stator in the closed state. It is an enlarged side view which shows the contact state.
In the figure, reference numeral 50 denotes a circuit breaker main body, 51 denotes a first terminal, 57 denotes a second terminal, 54 denotes a movable element that can contact the first terminal 51, and 56 denotes a movable element 54 and a second terminal. 57 is a flexible conductor for connecting to 57, 58 is a support shaft for rotatably supporting the mover 54 through the shaft hole 54H of the mover 54, 59 is a swing lever, 58 is a constituent member of a swing mechanism that swings the movable contact 53 of the mover 54 so that the movable contact 53 can come into contact with the fixed contact 52 of the first terminal 51, and 55 is a movable contact 53 in the closed state. It is a contact pressure spring that acts as a resilient member for contact. Reference numeral 60 in the figure denotes a lever arm as a constituent member of the swing mechanism, and the center of the lever arm is rotationally coupled to the body of the circuit breaker 50 and a part of the lever arm is pivotally coupled to the swing lever 59. ing. Reference numeral 62 denotes a mover arm as a constituent member of the swinging mechanism portion, which is a mover arm that holds the support shaft 58.
[0003]
In the open circuit state shown in FIG. 14, when the lever arm 60 is rotationally displaced in the direction of the arrow A shown in the figure, the swing lever 59 pushes the support shaft 58 to move the movable element 54 toward the first terminal 51 (in the drawing). To the right). In response to this rotational displacement, the mover arm 62 rotates clockwise about its fulcrum 62a, and the movable contact 53 of the mover 54 contacts the fixed contact 52 of the first terminal 51. Stop. In this stopped state, the lever arm 60 is locked by a locking means (not shown) such as a latch mechanism.
[0004]
In FIG. 15, when the lever arm 60 is locked, the support shaft 58 cannot be displaced and its position is fixed. However, the movable element 54 that is rotatably supported by the support shaft 58 is a resilient member. By the repulsive force of the contact pressure spring 55 as described above, a rotational force in the clockwise direction about the support shaft 58 is received, and the contact stationary state between the movable contact 53 and the fixed contact 52 is maintained.
That is, the contact pressure spring 55 as the elastic member moves the movable contact 53 of the movable element 54 as the support shaft 58 of the swing lever 59 is pushed by the rotational displacement of the lever arm 60 in the arrow A direction. Since the repulsive force, that is, the repulsive force in the direction in which the first terminal 51 is pressed against the fixed contact 52 is gradually accumulated, the repulsive force in the above-described stop state, that is, in the locked closed circuit state, The movable contact 53 is always in pressure contact with the fixed contact 52.
By the series of operations as described above, the circuit breaker 50 is changed from the open state in FIG. 14 to the closed state in FIG. 15.
[0005]
FIG. 17 is a plan view of FIG. 16 showing the main part in a horizontal cross section, and shows an ideal state where the movable contact 53 of the circuit breaker 50 comes into contact with the fixed contact 52 and is stationary. . Incidentally, the actual clearance (clearance) between the inner peripheral surface of the shaft hole 54H bored in the movable element 54 and the outer peripheral surface of the support shaft 58 passing through the shaft hole 54H is about 0.5 to 0.6 mm and cannot be visually observed. However, it is exaggerated for convenience of explanation.
[0006]
In FIG. 17, reference numeral 54 </ b> F indicates a contact surface portion of the movable element 54 that contacts the support shaft 58, that is, a contact portion of the inner peripheral surface of the shaft hole 54 </ b> H that contacts the outer peripheral surface of the support shaft 58. A contact surface of the support shaft 58 that comes into contact with the child 54, that is, a contact portion of the outer peripheral surface of the support shaft 58 that comes into contact with the inner peripheral surface of the shaft hole 54H is shown. Reference numeral 53F indicates a movable contact contact surface of the movable contact 53 that contacts the fixed contact 52, and reference numeral 52F indicates a fixed contact contact surface of the fixed contact 52 that contacts the movable contact 53. Reference numerals 63 and 64 are stoppers disposed on both sides of the movable element 54 in order to restrict displacement of the movable element 54 in the direction of the support shaft 58.
[0007]
Now, the movable contact 53 and the fixed contact 52 shown in FIG. 17 are in an ideal contact state, and the projection surfaces of both the movable contact contact surface 53F and the fixed contact contact surface 52F are shown in S1 of FIG. So that the entire surface is in contact.
However, in order to make contact in such an ideal state, the counter-axis contact surface 54F of the mover 54 and the movable contact contact surface 53F are parallel to each other, and the counter-hole contact surface 58F of the support shaft 58 and the fixed contact contact surface 52F. It is necessary to be parallel with.
For this reason, conventionally, high-precision parts are required, and precise assembling work that eliminates errors is necessary, which has been a cause of significant cost increase.
[0008]
FIG. 18 is a horizontal sectional view showing a defective contact state between the movable element 54 of the conventional circuit breaker and the first terminal 51, and an assembly error is caused even with an inaccurate part or a highly accurate part. The case where the counter-axis contact surface 54F of the movable element 54 and the movable contact contact surface 53F of the movable contact 53 are not parallel to each other is shown. Note that the same parts as those in FIG.
In this state, the movable contact contact surface 53F and the fixed contact contact surface 52F are in a single contact state, and the projection surfaces of both the movable contact contact surface 53F and the fixed contact contact surface 52F are partially shown as S2 in FIG. Just touching, the contact area is greatly reduced.
[0009]
FIG. 19 is a horizontal sectional view showing a defective contact state between the movable element 54 of the conventional circuit breaker and the first terminal 51, and it is possible to assemble even inaccurate parts or high precision parts due to assembly errors. The case where the contact hole contact surface 58F of the support shaft 58 and the fixed contact contact surface 52F of the fixed contact 52 are not parallel is shown. Note that the same parts as those in FIG.
Even in this state, the movable contact contact surface 53F and the fixed contact contact surface 52F are in a single-contact state, and the projection surfaces of the movable contact contact surface 53F and the fixed contact contact surface 52F are partially in contact as shown in FIG. 19S3. This also greatly reduces the contact area.
[0010]
[Problems to be solved by the invention]
In the conventional mover structure of the circuit breaker, the parallel contact surface 54F and the movable contact contact surface 53F of the mover 54, the parallel contact surface 58F of the support shaft 58 and the fixed contact contact surface 52F, etc. Is lost, the movable contact contact surface 53F and the fixed contact contact surface 52F are in a single-contact state at the time of closing, so that the contact area between the movable contact contact surface 53F and the fixed contact contact surface 52F is greatly reduced. As a result, the contact resistance increases.
Therefore, the generation of Joule heat causes a significant temperature rise, and there is a problem that large parts must be used, which hinders downsizing of the circuit breaker.
[0011]
On the other hand, if the parallel contact surface 54F and the movable contact contact surface 53F of the mover 54 are parallel, the parallel contact surface 58F and the fixed contact contact surface 52F of the support shaft 58 are to be secured, etc. In addition, it is necessary to increase the accuracy of each of the component parts, and it is necessary to perform precise assembly work, which raises a problem that material costs, processing costs, assembly costs, and the like increase.
[0012]
The present invention aims to solve such problems, and even if parts have inaccuracy or an assembly error occurs, the parallel contact surface of the movable element and the contact surface of the movable contact, and the support shaft pair. An object of the present invention is to provide a circuit breaker that can ensure parallelism between the hole contact surface and the fixed contact surface.
[0013]
[Means for Solving the Problems]
The invention according to claim 1 is a first terminal, a second terminal, a mover that can contact the first terminal, a conductor that connects the mover and the second terminal, and the mover. A support shaft that penetrates the shaft hole of the movable member and rotatably supports the mover, and displaces the support shaft to swing the movable contact of the mover so as to be in contact with the fixed contact of the first terminal. In a circuit breaker including a swing mechanism and a resilient member for bringing a movable contact into contact with a fixed contact in a closed state, the movable contact contact surface of the movable contact of the mover is the first during the closing operation. When contacting the fixed contact contact surface of the fixed contact of the terminal, the movable contact contact surface facing the fixed contact contact surface is swingable in the axial direction of the support shaft. The center portion of the support shaft that contacts the inner peripheral surface of the shaft hole of the mover is once divided from both end bearing portions of the support shaft, and then the both end bearing portions and both end portions of the center portion are connected. The connection between the both end bearing portions and the both end portions of the central portion is a rotatable connection. It is characterized by that.
[0020]
Claim 2 The invention includes a first terminal, a second terminal, a mover that can contact the first terminal, a conductor that connects the mover and the second terminal, and a shaft hole of the mover. A swing mechanism that has a support shaft that penetrates through the shaft and rotatably supports the mover, and displaces the support shaft to swing the movable contact of the mover so as to be in contact with the fixed contact of the first terminal. And a resilient member for bringing the movable contact into contact with the fixed contact in a closed state, the movable contact contact surface of the movable contact of the mover is the first terminal during the closing operation. When contacting the fixed contact contact surface of the fixed contact, the movable contact contact surface facing the fixed contact contact surface is swingable in the axial direction of the support shaft on the inner peripheral surface of the shaft hole of the mover. Once the center part of the supporting shaft that comes into contact with the bearing parts at both ends of the supporting shaft is once split, Both end bearing portions and both end portions of the center portion are connected, and the connection between the both end bearing portions and both ends of the center portion is a connection that is at least relatively rotatable in the horizontal direction. To do.
[0022]
Claim 3 The invention of claim 1 Or Claim 2 In the described circuit breaker, two movable contacts of the mover are arranged at intervals in the axial direction of the support shaft.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
The invention shown in the first embodiment includes, for example, a first terminal 51, a second terminal 57, a movable element 54 that can come into contact with the first terminal 51, as shown in FIG. A flexible conductor 56 for connecting the child 54 and the second terminal 52, and a support shaft 58 that passes through the shaft hole 54H of the movable element 54 and rotatably supports the movable element 54. The support mechanism 58 is displaced to swing the movable contact 53 of the mover 54 so that the movable contact 53 can come into contact with the fixed contact 52 of the first terminal 51, and the movable contact 53 contacts the fixed contact 52 in the closed state. The circuit breaker includes a contact pressure spring 55 acting as a resilient member for causing the movable contact point 53F of the movable contact point 53 of the movable element 54 to be the first terminal during the closing operation. Contact with the fixed contact contact surface 52F of the 51 fixed contact 52 When moving, the movable contact contact surface 53F facing the fixed contact contact surface 52F can swing freely in the axial direction of the support shaft 58 on the inner peripheral surface of the shaft hole 54H of the mover 54 in contact with the support shaft 58. A guide surface is formed.
[0024]
1 to 5 show the first embodiment. 1 is a horizontal sectional view showing the moment when the movable contact 53 and the fixed contact 52 of the first terminal 51 come into contact, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a view of fixing the movable contact 53 and the first terminal 51. 4 is a horizontal sectional view showing a stationary state in which the contact 52 is ideally in contact; FIG. 4 is a plan view showing the direction of action of the moment at which the movable contact 53 and the fixed contact 52 of the first terminal 51 are in contact; FIG. 6 is a plan view showing a balance of forces after the movable contact 53 and the fixed contact 52 of the first terminal 51 come into contact with each other and come to rest.
[0025]
1 to 5, reference numeral 54 </ b> X is a guide surface formed on the inner peripheral surface of the shaft hole 54 </ b> H of the mover 54. This guide surface 54X expands the hole by scraping the hole edges on both ends of the shaft hole 54H. In the cross-sectional shape in the axial direction of the support shaft 58, that is, in the horizontal cross section, the guide surface 54X is the center in the length direction of the shaft hole 54H. It is formed so as to form a convex shape. Although it is formed in an arc shape in FIG. 1, it may be formed in an R shape so as to draw an arc having a radius R.
[0026]
As described above, when the guide surface 54X is formed on the inner peripheral surface of the shaft hole 54H of the movable element 54 that comes into contact with the support shaft 58, when the movable contact 53 and the fixed contact 52 are in a single contact state at the time of closing, the contact pressure spring The biasing force applied to the movable element 54 causes the movable element 54 to oscillate, so that the one-sided contact state is eliminated, and the movable contact contact surface 53F and the fixed contact contact surface 52F are brought into surface contact with each other to contact the two. Is the maximum.
[0027]
This will be described with reference to FIGS.
First, FIG. 1 shows that the moment when the movable contact contact surface 53F and the fixed contact contact surface 52F come into contact with each other if the contact surface 58F and the fixed contact contact surface 52F are not parallel due to tolerance or assembly error when the circuit is closed. As shown in FIG. 1, the projection surface where the two pieces come into contact with each other at this time is extremely small as shown in S4 of FIG.
[0028]
FIG. 4 shows the force relationship in the state of FIG. 1. In FIG. 4, F1 indicates the force exerted by the support shaft 58 on the movable element 54, and F2 indicates the fixed contact contact surface 52F with respect to the movable contact contact surface 53F. It shows the force exerted. At this time, the force F2 is generated at a location where the movable contact contact surface 53F and the fixed contact contact surface 52F are in contact with each other as in the conventional case.
However, due to the guide surface 54X formed in a convex shape on the inner peripheral surface of the shaft hole 54H of the movable element 54 that contacts the support shaft 58, the force F1 is different from the conventional case, so that the force F1 is the contact surface of the support shaft 58 with the hole It occurs between 58F and the inner peripheral surface of the shaft hole 54H of the mover 54. The resultant force F1 and force F2 is generated in a direction in which the contact between the fixed contact contact surface 52F and the movable contact contact surface 53F is eliminated by the action of the guide surface 54X, that is, the axial direction of the support shaft 58. Rotational force M that encourages rocking to
[0029]
Due to the generation of the rotational force M, the mover 54 starts to swing or rotate in the direction of the arrow of the rotational force M. The mover 54 stops when the force F1 and the force F2 are on the same straight line, and is in the state shown in FIG. At this time, as shown in S5 of FIG. 3, the projection surface where both of them are in contact is in full surface contact, and the contact area is greatly increased compared to S4 of FIG. FIG. 5 shows a balance state of the force at this time, and the force F1 and the force F2 are on the same straight line, and the rotational force M disappears.
[0030]
As described above, the movable element 54 is urged to swing by the guide surface 54X formed in a convex shape on the inner peripheral surface of the shaft hole 54H, and the fixed contact contact surface 52F and the movable contact contact surface of the fixed contact 52 are urged. When the surface of 53F is in surface contact with each other, the contact area between the two is maximized, and the contact resistance is reduced.
[0031]
In the illustrated example, the guide surface 54X is formed on the inner peripheral surface of the shaft hole 54H of the mover 54 that contacts the support shaft 58. However, the guide surface 54X is formed over the entire circumference of the inner peripheral surface. It is good (not shown). Forming over the entire circumference is advantageous in that the machining operation is facilitated.
[0032]
Embodiment 2. FIG.
FIG. 6 shows the second embodiment, in which the guide surface 54X formed in a convex shape on the inner peripheral surface of the shaft hole 54H has a polygonal shape in a horizontal section. The polygonal shape ranges from an infinite number of sides that are very close to an arc, such as an arc, to a triangular shape (a shape in which two sides of the triangle appear on the opposite-axis contact surface 54F), but the figure shows the opposite-axis contact surface 54F. This is an example in which a polygon having three sides is formed.
In this case as well, as described in the first embodiment, when the movable contact contact surface 53F and the fixed contact contact surface 52F are in a one-sided contact state when the circuit is closed, the mover 54 swings at a certain angle. The one-contact state is eliminated, and the movable contact contact surface 53F and the fixed contact contact surface 52F are brought into full surface contact with each other so that the contact area between them is maximized and the contact resistance is reduced. The projection surface of the contact between them is as shown in S7 of FIG.
As can be seen from the side view of FIG. 7, in the second embodiment, the guide surface 54X is formed over the entire circumference of both edges of the inner peripheral surface of the shaft hole 54H of the mover 54.
[0033]
Embodiment 3 FIG.
FIG. 8 shows the third embodiment, and during the closing operation, the movable contact contact surface 53F of the movable contact 53 of the mover 54 is connected to the fixed contact contact surface 52F of the fixed contact 52 of the first terminal 51. When contacting, the support shaft 58 that comes into contact with the inner peripheral surface of the shaft hole 54H of the mover 54 so that the movable contact contact surface 53F facing the fixed contact contact surface 52F can swing in the axial direction of the support shaft 58. The guide surface 58X is formed on the contact surface side of the support shaft 58, that is, the counter hole contact surface 58F of the support shaft 58.
As shown in FIGS. 8 and 9, the guide surface 58 </ b> X is formed by expanding the contact surface 58 </ b> F of the support shaft 58, and the guide surface 58 </ b> X in the axial cross section of the support shaft 58, that is, the horizontal cross section. Is formed in a convex shape toward the center in the length direction of the shaft hole 54H. Although it is formed in an arc shape in the drawing, it may be formed in an R shape so as to draw an arc having a radius R.
[0034]
As described above, when the guide surface 58X is formed on the contact surface side of the support shaft 58 that is in contact with the inner peripheral surface of the shaft hole 54H of the mover 54, the guide surface 58X is movable when the circuit is closed, as described in the first embodiment. When the contact point contact surface 53F and the fixed contact point contact surface 52F are in a single-contact state, the movable member 54 swings in the axial direction of the support shaft 58 by the biasing force applied to the movable member 54 by the contact pressure spring 55. The one-contact state is eliminated, and the movable contact contact surface 53F and the fixed contact contact surface 52F are brought into full contact with each other to maximize the contact area between them, thereby reducing the contact resistance. The projection surface of the contact between them is as shown in S9 of FIG.
The convex guide surface 58X formed on the support shaft 58 has a cross-sectional shape in the axial direction of the guide surface 54X, and the center in the length direction of the shaft hole 54H is convex toward the inner peripheral surface of the mover 54. In the figure, it is formed in an arc shape. However, as described in the second embodiment, it may be formed in an R shape so as to draw an arc having a radius R, or in a polygonal shape. It may be formed.
In the illustrated example, the guide surface 58X bulges out the region of the contact hole contact surface 58F of the support shaft 58, but the outer periphery of the support shaft 58 that contacts the inner peripheral surface of the shaft hole 54H of the mover 54 is shown. The guide surface 558X may be formed over the entire circumference of the surface (not shown).
[0035]
Embodiment 4 FIG.
FIG. 10 shows the fourth embodiment. During the closing operation, the movable contact contact surface 53F of the movable contact 53 of the mover 54 contacts the fixed contact contact surface 52F of the fixed contact 52 of the first terminal 51. When the support shaft 58 is in contact with the inner peripheral surface of the shaft hole 54H of the mover 54, the movable contact contact surface 53F facing the fixed contact contact surface 52F can swing in the axial direction of the support shaft 58. The central portion 58C, in other words, at least the shaft portion that is accommodated in the shaft hole 54H is once divided into three bearing portions 58S and 58T on both ends of the support shaft 58 that are not accommodated in the shaft hole 54H. Both ends Part The bearing portions 58S and 58T and both end portions of the central portion 58C are rotatably connected to form a single support shaft 58.
[0036]
The connection between the bearing portions 58S and 58T at both ends and the both ends of the central portion 58C may be rotatable by a connecting structure such as a universal joint, but at least during the closing operation, the movable contact 53 of the mover 54 is provided. When the movable contact point contact surface 53F contacts the fixed contact point contact surface 52F of the fixed contact 52 of the first terminal 51, the movable element 54 is relatively substantially horizontal so that it can swing in the axial direction of the support shaft 58. It is necessary to make the connection rotatable in the direction.
[0037]
FIG. 11 is a side view of FIG. 10, and FIG. 12 shows an example of a connection structure between the both end bearing portions 58S and the center portion 58C. As can be seen from FIG. 12, the center portion 58C has both end bearing portions 58S, 58T. On the other hand, it is pivotally attached by pins 71 and 74 so as to be rotatable in the horizontal direction (arrow A in FIG. 10). Note that the arrow B in FIG. 10 shows the relief on one side of the bearing portions 58S and 58T at both ends accompanying the rotational movement of the central portion 58C, that is, the sliding movement in the axial direction. Since it is a very slight sliding, it will be able to absorb well in gaps that occur naturally in structure during normal assembly and assembly.
[0038]
It should be noted that the support shaft 58 in the present invention may be pivotable or non-rotatable with respect to the bearings on both sides thereof. However, as in the examples shown in FIGS. When 58C is configured to be horizontally rotatable with respect to both end bearing portions 58S and 58T (arrow A in FIG. 10), at least one side of both end bearing portions 58S and 58T is in relation to the bearing. In order to make the operation of the support shaft 58 smooth, it is preferable to make the rotation impossible.
[0039]
Thus, during the closing operation, when the movable contact contact surface 53F of the movable contact 53 of the mover 54 contacts the fixed contact contact surface 52F of the fixed contact 52 of the first terminal 51, the fixed contact contact surface 52F is faced. The central portion 58C of the support shaft 58 that contacts the inner peripheral surface of the shaft hole 54H of the mover 54 is positioned at both ends of the support shaft 58 so that the movable contact contact surface 53F to be swingable in the axial direction of the support shaft 58. Part Once separated from the bearing portions 58S and 58T, both ends Part When the bearing portions 58S and 58T are connected to both ends of the central portion 58C, the movable contact contact surface 53F and the fixed contact contact surface 52F are substantially closed during closing, as in the first embodiment. When in the one-sided state, the contact pressure spring 55 is supported by an urging force applied to the movable element 54 according to, for example, an inclination in the axial direction due to poor accuracy of the inner peripheral surface of the shaft hole 54H formed in the movable element 54. The connecting portion of the shaft 58 rotates so that the central portion 58C of the support shaft 58 has both ends. Part When the support shaft 58 is bent as a whole with respect to the bearing portions 58S and 58T, the movable element 54 is swung to cancel the one-side contact state, and the movable contact contact surface 53F and the fixed contact contact surface 52F are in surface contact. As a result, the contact area between the two is maximized, and the contact resistance is reduced. The projection surface of the contact between them is as shown at S10 in FIG.
[0040]
Embodiment 5. FIG.
FIG. 13 shows the fifth embodiment. In the structure of the movable element 54 shown in the first embodiment, two movable contacts 53A and 53B are further prepared as the movable contact 53 of the movable element 54. The two movable contacts 53A and 53B are in surface contact with the fixed contact contact surface 52F at an appropriate interval in the axial direction of the support shaft 58 on a predetermined surface of the movable element 54 facing the fixed contact contact surface 52F. It is arranged.
In this configuration, at the moment when the movable element 54 contacts the fixed contact contact surface 52F, the single contact state occurs. At that moment, as in the case of the first embodiment, a convex shape is formed on the inner peripheral surface of the shaft hole 54H. The moving surface 54 is urged to swing by the guide surface 54X formed in the shape, and there are two points, that is, the fixed contact contact surface 52F of the fixed contact 52 and the movable contact contact surface 53F of the two movable contacts 53A and 53B. A stable surface contact between the two surfaces maximizes the contact area between the two surfaces and reduces the contact resistance. The projection surfaces in contact with each other are as shown in S8 of FIG.
In this case, if the movable contact contact surfaces of the two movable contacts 53A and 53B are formed so as to have a relatively large area as compared with one case, the contact area is increased, for example, twice. Therefore, the contact resistance can be reduced and the improvement can be expected.
[0041]
Although FIG. 13 shows the case of the first embodiment, in any of the second to fourth embodiments, two movable contacts 53A and 53B are prepared as the movable contact 53 of the movable element 54, and these two movable contacts are prepared. The contacts 53A and 53B are arranged on a predetermined surface of the movable element 54 facing the fixed contact contact surface 52F so as to be in surface contact with the fixed contact contact surface 52F at an appropriate interval in the axial direction of the support shaft 58. Even in this case, the same effect can be obtained.
[0042]
【The invention's effect】
Claim 1 as well as Claim 2 In any of the inventions, the parallelism between the contact surface of the movable element and the contact surface of the movable contact, the parallelism of the contact surface of the support shaft with the hole and the fixed contact surface, etc., may result in inaccurate parts, assembly errors, etc. Even if the contact between the movable contact point and the fixed contact point comes into contact at the moment when the movable contact point and the fixed contact point come into contact with each other, the rotational force in the direction in which both contact points come into surface contact is instantaneous. Is given to the mover, the one-contact state is instantly canceled, and both come into surface contact, and the contact area is maximized. As a result, the generation of Joule heat is greatly suppressed, and smaller components can be used within the standard specification by law than the conventional one. A high-performance circuit breaker with a small rise can be provided.
Further, compared to the prior art, since high-precision processing and precise assembly work without error are not required for the component parts, it is possible to provide an inexpensive circuit breaker despite its high performance.
[0043]
Claim 3 Since the present invention has two movable contacts, the above-mentioned claim 1 as well as Claim 2 In addition to the function and effect of the present invention, the generation of contact resistance and Joule heat can be greatly reduced. For example, when the contact area is doubled, the contact resistance is halved, so the generation of Joule heat can also be halved. Can provide a high-performance circuit breaker with a small temperature rise.
[Brief description of the drawings]
FIG. 1 is a horizontal sectional view showing a moment when a movable contact and a fixed contact of a first terminal come into contact with each other.
FIG. 2 is a side view of FIG.
FIG. 3 is a horizontal sectional view showing a stationary state in which a movable contact and a fixed contact of a first terminal are in ideal contact with each other.
FIG. 4 is a plan view showing the action direction of force at the moment when the movable contact and the fixed contact of the first terminal come into contact with each other.
FIG. 5 is a plan view showing a balance of forces after the movable contact and the fixed contact of the first terminal come into contact with each other and come to rest.
FIG. 6 is a horizontal sectional view showing the second embodiment.
7 is a side view of FIG. 6. FIG.
FIG. 8 is a horizontal sectional view showing a third embodiment.
9 is a side view of FIG. 8. FIG.
FIG. 10 is a horizontal sectional view showing a fourth embodiment.
11 is a side view of FIG.
FIG. 12 is a view showing an example of a connection structure between both end bearing portions and a central portion.
13 is a horizontal sectional view showing the fifth embodiment. FIG.
FIG. 14 is a side view showing an open circuit state of a conventional circuit breaker.
FIG. 15 is a side view showing a closed state of a conventional circuit breaker.
FIG. 16 is an enlarged side view showing a contact state between the mover and the first terminal stator in a closed state;
17 is a horizontal cross section showing a main part of FIG. 16 in a partial cross section.
FIG. 18 is a horizontal cross-sectional view showing a poor contact state between the mover of the conventional circuit breaker and the first terminal.
FIG. 19 is a horizontal cross-sectional view showing a poor contact state between a mover and a first terminal of a conventional circuit breaker.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 50 Circuit breaker, 51 1st terminal, 52 Fixed contact, 52F Fixed contact contact surface, 53 Movable contact, 53F Movable contact contact surface, 54 Movable child, 54F Axial contact surface, 54H Shaft hole, 54X Guide surface, 55 Elastic member (contact pressure spring), 56 conductors, 57 second terminal, 58 support shaft, 58C center portion, 58F counter hole contact surface, 58S, 58T both end bearing portions, 58X guide surface, S1 to S10 projection surface.

Claims (3)

A first terminal, a second terminal, a mover that can contact the first terminal, a conductor that connects the mover and the second terminal, and a shaft hole of the mover, A swing mechanism having a support shaft that rotatably supports the mover, and displacing the support shaft so that the movable contact of the mover can come into contact with the fixed contact of the first terminal; In a circuit breaker comprising a resilient member for bringing a movable contact into contact with a fixed contact in a state,
During the closing operation, when the movable contact surface of the movable contact of the mover contacts the fixed contact surface of the fixed contact of the first terminal, the movable contact surface facing the fixed contact contact surface is the support shaft. The center portion of the support shaft that contacts the inner peripheral surface of the shaft hole of the mover is once divided from both end bearing portions of the support shaft so as to be swingable in the axial direction of the mover, and then the both end bearing portions And the both ends of the center portion are connected, and the connection between the both end bearing portions and the both ends of the center portion is a rotatable connection. A first terminal, a second terminal, a mover that can contact the first terminal, a conductor that connects the mover and the second terminal, and a shaft hole of the mover, A swing mechanism having a support shaft that rotatably supports the mover, and displacing the support shaft so that the movable contact of the mover can come into contact with the fixed contact of the first terminal; In a circuit breaker comprising a resilient member for bringing a movable contact into contact with a fixed contact in a state,
During the closing operation, when the movable contact surface of the movable contact of the mover contacts the fixed contact surface of the fixed contact of the first terminal, the movable contact surface facing the fixed contact contact surface is the support shaft. The center portion of the support shaft that contacts the inner peripheral surface of the shaft hole of the mover is once divided from both end bearing portions of the support shaft so as to be swingable in the axial direction of the mover, and then the both end bearing portions And the both ends of the central portion are connected, and the connection between the both end bearing portions and the both ends of the central portion is a connection that is at least relatively rotatable in the horizontal direction. . Circuit breaker according to claim 1 or claim 2 movable contact of the movable element is characterized in that the two arranged at intervals in the axial direction of the support shaft.

Images