Circuit breaker and movable element unit

Abstract

To obtain a circuit breaker in which contact resistance between a movable contact and a plurality of plate springs is stabilized without welding and in which device cost is reduced. The circuit breaker has a fixed contact and a movable unit (8) having a movable contact (9) having a rivet portion (9b) capable of rivet engagement and a movable portion (80) that causes the movable contact (9) to perform opening and closing operations. The movable portion (80) is configured by overlapping a first plate spring (8b) and a second plate spring (8c) in the order of the first plate spring (8b) and the second plate spring (8c), the first plate spring (8b) having a hole portion through which the rivet portion (9b) passes, being composed of a first material, and the second plate spring (8c) having a hole portion, being composed of a second material having a higher electrical conductivity than the first material. The hole portion of the first plate spring (8b) has one or a plurality of groove portions (20) close to the portion through which the rivet portion (9b) passes, and the flattened rivet portion (9b) is filled in the groove portion (20).

Description

Technical Field

[0001] This invention relates to a circuit breaker that opens and closes a circuit via contacts, and a movable element unit that drives the contacts. Background Technology

[0002] The contacts of the circuit breaker have fixed contacts and movable contacts, and a movable element unit for opening and closing the movable contacts. In Patent Document 1, after the movable contacts are joined to the movable element unit, which is constructed of multiple overlapping metal leaf springs, by riveting, the movable contacts and the multiple leaf springs are joined by welding to increase the contact area and stabilize the contact resistance.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2016-103374

[0004] However, the method in Patent Document 1 has the following problem: welding is labor-intensive and time-consuming, and circuit breakers cannot be supplied cheaply. Summary of the Invention

[0005] The present invention is proposed in view of the above situation, and its purpose is to obtain a circuit breaker that can stabilize the contact resistance between the movable contact and multiple leaf springs without welding, thereby reducing the cost of the device.

[0006] To solve the above problems and achieve the objective, the circuit breaker of the present invention includes: a fixed contact; and a movable element unit having a movable contact and a movable portion. The movable contact is configured to contact the fixed contact, with one end in contact with the fixed contact and the other end having a riveting portion for riveting engagement. The movable portion causes the movable contact to perform opening and closing operations. The movable portion is constructed by overlapping a first leaf spring and a second leaf spring in the order of first leaf spring and second leaf spring from one end toward the other. The first leaf spring has a hole through which the riveting portion passes and is made of a first material. The second leaf spring has a hole and is made of a second material with a higher conductivity than the first material. The hole of the first leaf spring has one or more grooves close to the portion through which the riveting portion passes, and the flattened riveting portion fills the grooves.

[0007] The effects of the invention

[0008] According to the circuit breaker of the present invention, the contact resistance between the movable contact and multiple leaf springs can be stabilized without welding, thereby reducing the cost of the device. Attached Figure Description

[0009] Figure 1 This is a front view showing the structure of the circuit breaker according to Embodiment 1.

[0010] Figure 2 This is a cross-sectional view showing the switching operation of the circuit breaker according to Embodiment 1. Figure 1A cross-sectional view of AA in the direction of the vector.

[0011] Figure 3 This is a cross-sectional view showing the interior of the circuit breaker according to Embodiment 1. Figure 1 A cross-sectional view of BB in the direction of the vector.

[0012] Figure 4 This is a side view showing the structure of the movable element unit according to Embodiment 1.

[0013] Figure 5 This is a perspective view showing the exploded structure of the movable element unit according to Embodiment 1.

[0014] Figure 6 This is a diagram showing an overview of the leaf springs and material combinations of the movable unit involved in Embodiment 1.

[0015] Figure 7 This is a diagram illustrating an example of a first leaf spring according to Embodiment 1.

[0016] Figure 8 This is a diagram illustrating another example of the first leaf spring involved in Embodiment 1.

[0017] Figure 9 This is a diagram illustrating another example of the first leaf spring involved in Embodiment 1.

[0018] Figure 10 This is a diagram illustrating the groove formed in the first leaf spring according to Embodiment 1.

[0019] Figure 11 This is a cross-sectional view showing the state after the movable contact is riveted to the movable part according to Embodiment 1. Figure 4 A cross-sectional view of the CC vector.

[0020] Figure 12 This is a cross-sectional view showing the disconnecting operation of the circuit breaker according to Embodiment 1. Figure 1 A cross-sectional view of AA in the direction of the vector.

[0021] Figure 13 This is a cross-sectional view showing the tripping operation of the circuit breaker according to Embodiment 1. Figure 1 A cross-sectional view of AA in the direction of the vector.

[0022] Figure 14 This is a side view showing the structure of the movable unit according to Embodiment 2.

[0023] Figure 15 This is an enlarged view showing the structure of the movable unit involved in Embodiment 2.

[0024] Figure 16This is a cross-sectional view showing the state after the movable contact is riveted to the movable part according to Embodiment 2. Figure 14 A cross-sectional view of DD in the vector direction. Detailed Implementation

[0025] The circuit breaker and movable element unit according to the embodiments will now be described in detail with reference to the accompanying drawings.

[0026] Implementation Method 1

[0027] The circuit breaker 100 according to Embodiment 1 will be described. Figure 1 This is a front view showing the structure of the circuit breaker 100 according to Embodiment 1. Figure 2 This is a cross-sectional view showing the closing operation of the circuit breaker 100 according to Embodiment 1. Figure 1 A cross-sectional view of AA in the direction of the vector. Figure 3 This is a cross-sectional view showing the interior of the circuit breaker 100 according to Embodiment 1. Figure 1 A cross-sectional view of BB in the direction of the vector.

[0028] like Figure 1 As shown, the circuit breaker 100 has a frame 3, which is composed of a base 1 and a housing 2. The base 1 and housing 2 are made of insulating materials such as plastic. On the frame 3, a power-side terminal 5, connected to an external wire on the supply side, is provided on the upper side of the X-axis plane, and a load-side terminal 6, connected to an external wire on the load side, is provided on the lower side of the X-axis plane. Furthermore, a handle 4, made of insulating material, is located at the center of the circuit breaker 100 along the Y-axis and moves vertically along the X-axis plane. Alternatively, the handle 4 can be positioned on either the left or right side of the Y-axis plane of the circuit breaker 100.

[0029] like Figure 2 As shown, the fixed contact 7 is fixedly connected to the power supply side terminal 5. Additionally, the movable unit 8 has a movable contact 9 fixed at one end and the other end fixed to the base 1. The power supply side terminal 5 and the movable unit 8 are arranged such that the fixed contact 7 and the movable contact 9 are located within the arc suppression chamber 10. Due to the elasticity of the bent portion 8a of the movable unit 8, the movable contact 9 is always subjected to force in a direction away from the fixed contact 7.

[0030] The mechanism section 11 includes a trip lever 12, a push plate 13 that pushes the movable member unit 8, a frame (not shown) that holds the handle 4 and trip lever 12 in an operable manner, a spring (not shown) that holds the movement of the mechanism section 11, a handle spring (not shown), and a trip button (not shown) for testing whether the tripping action is performed normally. Furthermore, the movable member unit 8 passes through a hole in the push plate 13, and the push plate 13 and the movable member unit 8 move synchronously along the left-right direction of the Z-axis on the paper.

[0031] Next, the bimetallic component 14 will be described. The bimetallic component 14 is made by bonding metals with different coefficients of thermal expansion. By placing a metal with a smaller coefficient of thermal expansion on the side facing the trip lever 12 and a metal with a larger coefficient of thermal expansion on the opposite side, it can bend due to the difference in thermal expansion when heat is generated by a current greater than or equal to the allowable value, such as a short-circuit current or overcurrent. The bimetallic component 14 is configured such that it can push against the trip lever 12 when bent. The right end of the Z-axis of the bimetallic component 14 is fixed to the movable element unit 8. Therefore, it is configured such that current flows through the movable element unit 8 and the bimetallic component 14 when the circuit breaker 100 performs the closing operation described later. Additionally, a copper wire (not shown) electrically connected to the load-side terminal 6 is fixed to the left end of the Z-axis of the bimetallic component 14. With this structure, when the circuit breaker 100 is in the closing state described later, current flows through the power supply-side terminal 5 and the load-side terminal 6.

[0032] like Figure 3 As shown, a connecting rod 15 that can push the push plate 13 and a connecting rod pin 16 that transmits the action of the handle 4 to the connecting rod 15 are provided between the handle 4 and the push plate 13. The connecting rod pin 16 is configured to be inserted into the holes provided in the handle 4 and the connecting rod 15, and moves in conjunction with the handle 4 and the connecting rod 15. Here, the push plate 13 and the connecting rod 15 contact at the abutment portion 17.

[0033] Figure 4 This is a side view showing the structure of the movable element unit 8 according to Embodiment 1. Figure 5 This is a perspective view showing the exploded structure of the movable unit 8 according to Embodiment 1. (Example) Figure 4 As shown, the movable member unit 8 has a movable contact 9 and a movable part 80 that causes the movable contact 9 to open and close. The movable part 80 has a first leaf spring 8b and a third leaf spring 8d formed of a first material, i.e., a first metal (e.g., phosphor bronze), which has high strength and low electrical conductivity, and a second leaf spring 8c and a fourth leaf spring 8e formed of a second material, i.e., a second metal (e.g., copper), which has lower strength than the first metal and high electrical conductivity. The movable member unit 8 is constructed by riveting the riveting part 9b of the movable contact 9 in a manner that prevents the first leaf spring 8b, the second leaf spring 8c, the third leaf spring 8d, and the fourth leaf spring 8e from separating.

[0034] like Figure 5 As shown, the movable contact 9 has a cylindrical contact portion 9a at one end that contacts the fixed contact 7, and a cylindrical riveting portion 9b at the other end with a diameter smaller than that of the contact portion 9a. The riveting portion 9b passes through the hole 8f of the first leaf spring 8b, the hole 8k of the second leaf spring 8c, the hole 8k of the third leaf spring 8d, and the hole 8k of the fourth leaf spring 8e. Regarding the movable element unit 8, in Figure 5In the Z-axis direction, viewed from the riveting part 9b side of the movable contact 9, the first leaf spring 8b, the second leaf spring 8c, the third leaf spring 8d, and the fourth leaf spring 8e are arranged sequentially toward the contact part 9a.

[0035] The first leaf spring 8b contacts the push plate 13 when the circuit breaker 100 performs the closing action described later. The first leaf spring 8b is pressed by contacting the push plate 13 during the closing action, and is therefore formed of a high-strength first metal. The third leaf spring 8d is formed of a high-strength first metal to prevent the second leaf spring 8c from breaking, and the third leaf spring 8d is arranged parallel to the second leaf spring 8c.

[0036] Preferably, the second leaf spring 8c is formed of a second metal with high electrical conductivity to facilitate energization. The fourth leaf spring 8e is also formed of a second metal with high electrical conductivity so that even if vibration occurs when the movable contact 9 contacts the fixed contact 7, the contact area with the riveted portion 9b of the movable contact 9 remains stable. Alternatively, the fourth leaf spring 8e may be omitted.

[0037] Here, the surface portion of the contact part 9a contacts the fourth leaf spring 8e, but the fourth leaf spring 8e is in contact with the fourth leaf spring 8e. Figure 5 The fourth leaf spring 8e is formed short in the X-axis direction below the paper plane so that it will not come into contact with the push plate 13 in the open or tripped state of the circuit breaker 100, as described later. This is because if it comes into contact with the push plate 13 in the open or tripped state of the circuit breaker 100, the low-strength fourth leaf spring 8e will break due to the load from the push plate 13 when the circuit breaker 100 performs its opening and closing operation.

[0038] Furthermore, the number of first leaf springs 8b and third leaf springs 8d can be greater than two. Additionally, the number of second leaf springs 8c and fourth leaf springs 8e can also be greater than two. For example, the movable unit 8 can also be composed of a total of six leaf springs. However, in this case, in the movable part 80, in... Figure 5 The riveting portion 9b side of the movable contact 9 in the Z-axis direction needs to be constructed using a leaf spring made of a first metal with low electrical conductivity.

[0039] Based on the movable element unit 8 constituting the circuit breaker 100, the circuit breaker 100 can be manufactured inexpensively by using metals with different strengths and conductivityes, such as the first metal and the second metal. Furthermore, by using readily available materials for the first metal and the second metal, the circuit breaker 100 can be manufactured stably.

[0040] Figure 6 This is a diagram showing an overview of the leaf spring and material combinations of the movable unit 8 according to Embodiment 1. (See diagram below.) Figure 6As shown, the first leaf spring 8b and the third leaf spring 8d use a first metal formed of a metal with high strength and low electrical conductivity, while the second leaf spring 8c and the fourth leaf spring 8e use a second metal formed of a metal with lower strength than the first metal and high electrical conductivity (e.g., copper).

[0041] Figure 7 This is a diagram illustrating an example of the first leaf spring 8b according to Embodiment 1. (See diagram below.) Figure 7 As shown, the hole 8f through which the riveting portion 9b of the movable contact 9 of the first leaf spring 8b passes is elongated. Figure 7 For example, the width of the hole 8f in the direction perpendicular to the X-axis, i.e., the major axis width 8g, is made longer than the width in the X-axis direction, i.e., the minor axis width 8h. By making the hole 8f an elongated hole, grooves 20 are provided at two locations near both sides of the portion through which the riveting part 9b passes. Furthermore, the directions of the major axis width 8g and the minor axis width 8h of the hole 8f can be set to any direction.

[0042] Figure 8 This is a diagram illustrating another example of the first leaf spring 8b involved in Embodiment 1. Figure 9 This is a diagram illustrating another example of the first leaf spring 8b involved in Embodiment 1. Figure 8 In this design, the hole 8f of the first leaf spring 8b is elliptical in shape. By making the hole 8f elliptical, grooves 20 are provided at two locations near the portion through which the riveting part 9b passes. Figure 9 In the first leaf spring 8b, the hole 8f is shaped with four additional grooves 20 close to the portion through which the riveting part 9b passes. Figure 9 In the die, four grooves 20 are formed around the portion through which the riveting part 9b passes. By providing grooves close to the portion through which the riveting part 9b passes, the punch of the stamping die only needs to be thickened at the portion close to the riveting part 9b, thus preventing punch breakage. Furthermore, the grooves 20 near the portion through which the riveting part 9b passes can be provided as a single groove 20 or multiple grooves 20 can be provided intermittently. Alternatively, the shape of the hole 8f in the Z-axis direction can be set as a tapered shape with a larger diameter towards the end face on the riveting side.

[0043] Figure 10 This is a diagram illustrating the groove 20 formed in the first leaf spring 8b according to Embodiment 1. Figure 11 This is a cross-sectional view showing the state after the movable contact 9 is riveted to the movable part 80 according to Embodiment 1. Figure 4 A cross-sectional view along the CC direction. (e.g.) Figure 10 As shown, when the riveted portion 9b of the movable contact 9 passes through the first leaf spring 8b, grooves 20 are generated on both sides of the hole 8f in the length direction.

[0044] like Figure 11 As shown, when the riveted portion 9b of the movable contact 9 undergoes plastic deformation due to riveting, the riveted portion 9b is flattened and expands into the groove 20, filling the groove 20. Therefore, the second leaf spring 8c, formed of a highly conductive second metal, contacts the riveted portion 9b of the movable contact 9 at the groove 20. Thus, the groove 20 increases the contact area between the second leaf spring 8c and the riveted portion 9b of the movable contact 9, stabilizing the energization of the circuit breaker 100. Furthermore, during the closing operation described later, when the fixed contact 7 contacts the movable contact 9, even if a load is applied to the movable contact 9 and the movable contact 9 vibrates, the contact area of ​​the riveted portion 9b of the movable contact 9 is ensured, thus stabilizing the energization of the circuit breaker 100.

[0045] Here, the contact surface 9c of the movable contact 9 contacts the fourth leaf spring 8e. The contact surface of the fourth leaf spring 8e has low resistance, but as described above, it is set to a length that will not contact the push plate 13, thus contributing nothing to stabilizing the energization of the movable element unit 8. Therefore, as a condition for stabilizing the energization of the circuit breaker 100 via the slot 20, a first leaf spring 8b is disposed on the riveting portion 9b side of the movable element unit 8, and a second leaf spring 8c is disposed between the first leaf spring 8b and the contact portion 9a. Therefore, the movable part 80 only needs to have at least a first leaf spring 8b and a second leaf spring 8c.

[0046] Next, the operation of the circuit breaker 100 will be explained. First, the closing operation of the circuit breaker 100 will be explained. This will be done by positioning the front end of the handle 4 upwards along the X-axis towards the top of the paper. Figure 2 The handle 4 shown is operated to cause the linkage 15 ( Figure 3 ) and connecting pin 16 ( Figure 3 The pusher plate 13 is pushed to the right of the Z-axis plane. The action here will be described later. The pushed pusher plate 13 moves the movable element 8 and the movable contact 9 towards the fixed contact 7. Figure 2 The circuit breaker 100 is turned on by pushing the fixed contact 7 against the movable contact 9 (right side of the Z-axis) to overcome the elastic force of the bent portion 8a of the movable member unit 8. During this connection operation, the trip lever 12 in the mechanism 11 engages with the spring key (not shown) to keep the fixed contact 7 in contact with the movable contact 9.

[0047] In addition, such as Figure 3 As shown, during the engagement action, the connecting rod 15 contacts the push plate 13 at the contact part 17. Figure 3 The surface on the left side of the Z-axis paper surface is in contact with the push plate 13, which can push the push plate 13 to the right side of the Z-axis paper surface.

[0048] Next, the disconnection operation of the circuit breaker 100 will be explained. Figure 12This is a cross-sectional view showing the disconnection operation of the circuit breaker 100 according to Embodiment 1. Figure 1 A sectional view along the AA direction. The handle 4 is operated by positioning the front end of the handle 4 downwards along the X-axis, thereby causing the connecting rod 15 and connecting rod pin 16 (see reference). Figure 3 The actuator moves the push plate 13 to the left of the Z-axis plane. Since the movable element 8 passes through the push plate 13, it moves to the left of the Z-axis plane in conjunction with the push plate 13. Therefore, the movable contact 9 separates from the fixed contact 7, and the circuit breaker 100 becomes non-conductive. During this disconnection operation, the fixed contact 7 remains separated from the movable contact 9 due to the elasticity of the bent portion 8a of the movable element 8. Here, the handle 4 and the push plate 13 remain in the disconnected position in conjunction with the movable element 8.

[0049] Next, the tripping action of the circuit breaker 100 will be explained. Figure 13 This is a cross-sectional view showing the tripping operation of the circuit breaker 100 according to Embodiment 1. Figure 1 A cross-sectional view of AA in the direction of vector. If a short-circuit current or overcurrent, or other current greater than or equal to the allowable value, flows through... Figure 2 When the circuit breaker 100 is in the ON state, the bimetallic member 14 moves towards the trip lever 12, pushing the trip lever 12 provided in the mechanism section 11. This releases the engagement between the trip lever 12 and the spring key (not shown) within the mechanism section 11. Due to the elasticity of the bent portion 8a of the movable member unit 8, the movable contact 9 separates from the fixed contact 7, cutting off the current flowing through the circuit breaker 100. Due to the elasticity of the bent portion 8a of the movable member unit 8 and the load of the handle spring (not shown) mounted on the handle 4, the handle 4 is in a... Figure 2 The connection position shown is the same as Figure 12 The state is maintained at the middle position of the disconnected state shown.

[0050] According to Embodiment 1, the circuit breaker 100 includes: a fixed contact 7; and a movable unit 8 having a movable contact 9 and a movable part 80. The movable contact 9 is configured to contact the fixed contact 7, with one end in contact with the fixed contact 7 and the other end having a riveting part 9b for riveting engagement. The movable part 80 causes the movable contact 9 to open and close. The movable part 80 is constructed by overlapping a first leaf spring 8b and a second leaf spring 8c from one end toward the other in the order of the first leaf spring 8b and the second leaf spring 8c. The leaf spring 8b has a hole 8f through which the riveting part 9b passes, and is made of a first material. The second leaf spring 8c has a hole 8k and is made of a second material with a higher conductivity than the first material. The hole 8f of the first leaf spring 8b has one or more grooves 20 close to the portion through which the riveting part 9b passes. The flattened riveting part 9b is filled in the groove 20, thereby increasing the contact area between the movable contact 9 and the second leaf spring 8c. There is no need to weld the movable part unit 8, that is, the circuit breaker 100 can be provided cheaply.

[0051] Implementation Method 2

[0052] Figure 14 This is a side view showing the structure of the movable element unit 8 according to Embodiment 2. Figure 15 This is an enlarged view showing the structure of the movable unit 8 according to Embodiment 2. Figure 16 This is a cross-sectional view showing the state after the movable contact 9 is riveted to the movable part 80 according to Embodiment 2. Figure 14 A cross-sectional view of the DD vector direction. In Embodiment 1, the first leaf spring 8b and the third leaf spring 8d are separate components, but in Embodiment 2, the first leaf spring 8b and the third leaf spring 8d are integrated.

[0053] like Figure 14 , 15 As shown, the first leaf spring 8b is bent into a U-shape in the Z-axis direction at the upper part of the X-axis plane. Here, the second leaf spring 8c is sandwiched in the center of the U-shaped Z-axis. In addition, the riveting portion 9b side of the first leaf spring 8b, which is bent into a U-shape, is provided with a hole 8f having a groove 20, just like in Embodiment 1.

[0054] like Figure 16As shown, when the riveted portion 9b of the movable contact 9 undergoes plastic deformation through riveting, the riveted portion 9b is flattened and expands into the groove 20, filling the groove 20. Therefore, the second leaf spring 8c, formed of a highly conductive second metal, contacts the riveted portion 9b of the movable contact 9 at the groove 20. Thus, the groove 20 increases the contact area between the second leaf spring 8c and the riveted portion 9b of the movable contact 9, stabilizing the energization of the circuit breaker 100. Furthermore, during the closing operation described later, when the fixed contact 7 contacts the movable contact 9, even if a load is applied to the movable contact 9 and the movable contact 9 vibrates, the contact area of ​​the riveted portion 9b of the movable contact 9 is ensured, thus stabilizing the energization of the circuit breaker 100.

[0055] According to Embodiment 2, since a first leaf spring 8b bent into a U-shape is used, in addition to the effects shown in Embodiment 1, the number of parts can be reduced, and the equipment required to manufacture the circuit breaker 100, such as stamping dies, can be reduced. By suppressing investment costs, the circuit breaker 100 can be provided cheaply.

[0056] Furthermore, as shown in any of the above embodiments, if the movable element unit 8 is composed of stacked leaf springs and the movable contact 9 is riveted, the movable element unit 8 can be applied to an electromagnetic switch, relay, or micro switch even if it is not a circuit breaker 100.

[0057] The structures shown in the above embodiments represent one example of the content of the present invention. They can be combined with other known technologies, and the structures of each embodiment can be appropriately combined with each other. Without departing from the spirit of the present invention, a part of the structure can be omitted or modified.

[0058] The various aspects of the present invention are summarized below as appendices.

[0059] [Appendix 1]

[0060] A circuit breaker, characterized in that it has: Fixed contacts; and A movable component unit has a movable contact and a movable part. The movable contact is configured to contact the fixed contact, with one end in contact with the fixed contact and the other end having a riveting part for riveting engagement. The movable part causes the movable contact to open and close. The movable part is constructed by overlapping a first leaf spring and a second leaf spring from the other end toward the first end in the order of the first leaf spring and the second leaf spring. The first leaf spring has a hole through which the riveting part passes and is made of a first material. The second leaf spring has the hole and is made of a second material with a higher electrical conductivity than the first material. The hole of the first leaf spring has one or more grooves close to the portion through which the riveting portion passes, and the flattened riveting portion fills the grooves.

[0061] [Appendix 2]

[0062] The circuit breaker according to Appendix 1 is characterized in that, The movable part is formed by overlapping the first leaf spring, the second leaf spring, and the third leaf spring from the other end toward the first end in the order of the first leaf spring, the second leaf spring, and the third leaf spring. The third leaf spring has the hole and is made of the first material.

[0063] [Appendix 3]

[0064] The circuit breaker according to Appendix 1 or 2 is characterized in that, The hole in the first leaf spring is either elongated or elliptical.

[0065] [Appendix 4]

[0066] The circuit breaker according to Appendix 2 is characterized in that, The first leaf spring and the third leaf spring are integrated and bent into a U-shape.

[0067] [Appendix 5]

[0068] The circuit breaker according to any one of Appendices 1 to 4 is characterized in that, The strength of the first material is higher than that of the second material.

[0069] [Appendix 6]

[0070] A movable component unit has a movable contact and a movable part. The movable contact is configured to contact a fixed contact, with one end in contact with the fixed contact and the other end having a riveting part for riveting engagement. The movable part causes the movable contact to open and close. The movable element unit is characterized by the following features: The movable part is constructed by overlapping a first leaf spring and a second leaf spring from the other end toward the first end in the order of the first leaf spring and the second leaf spring. The first leaf spring has a hole through which the riveting part passes and is made of a first material. The second leaf spring has the hole and is made of a second material with a higher electrical conductivity than the first material. The hole of the first leaf spring has one or more grooves close to the portion through which the riveting portion passes, and the flattened riveting portion fills the grooves.

[0071] Explanation of the label

[0072] 1 Base, 2 Housing, 3 Frame, 4 Handle, 5 Power supply side terminal, 6 Load side terminal, 7 Fixed contact, 8 Movable part unit, 8a Bending part, 8b First leaf spring, 8c Second leaf spring, 8d Third leaf spring, 8e Fourth leaf spring, 8f, 8k Hole, 8g Long axis width, 8h Short axis width, 9 Movable contact, 9a Contact part, 9b Riveting part, 9c Contact surface, 10 Arc suppression chamber, 11 Mechanism part, 12 Trip lever, 13 Push plate, 14 Bimetallic part, 15 Linkage rod, 16 Linkage pin, 17 Abutment part, 20 Slot, 80 Movable part, 100 Circuit breaker.

Claims

1. A circuit breaker, characterized in that, have: Fixed contacts; as well as A movable component unit has a movable contact and a movable part. The movable contact is configured to contact the fixed contact, with one end in contact with the fixed contact and the other end having a riveting part for riveting engagement. The movable part causes the movable contact to open and close. The movable part is constructed by overlapping a first leaf spring and a second leaf spring from the other end toward the first end in the order of the first leaf spring and the second leaf spring. The first leaf spring has a hole through which the riveting part passes and is made of a first material. The second leaf spring has the hole and is made of a second material with a higher electrical conductivity than the first material. The hole of the first leaf spring has one or more grooves close to the portion through which the riveting portion passes, and the flattened riveting portion fills the grooves.

2. The circuit breaker according to claim 1, characterized in that, The movable part is formed by overlapping the first leaf spring, the second leaf spring, and the third leaf spring from the other end toward the first end in the order of the first leaf spring, the second leaf spring, and the third leaf spring. The third leaf spring has the hole and is made of the first material.

3. The circuit breaker according to claim 1, characterized in that, The hole in the first leaf spring is either elongated or elliptical.

4. The circuit breaker according to claim 2, characterized in that, The first leaf spring and the third leaf spring are integrated and bent into a U-shape.

5. The circuit breaker according to any one of claims 1 to 4, characterized in that, The strength of the first material is higher than that of the second material.

6. A movable element unit having a movable contact and a movable portion, the movable contact being configured to contact a fixed contact, one end of which contacts the fixed contact, and the other end having a riveting portion for riveting engagement, the movable portion causing the movable contact to open and close. The movable element unit is characterized by the following features: The movable part is constructed by overlapping a first leaf spring and a second leaf spring from the other end toward the first end in the order of the first leaf spring and the second leaf spring. The first leaf spring has a hole through which the riveting part passes and is made of a first material. The second leaf spring has the hole and is made of a second material with a higher electrical conductivity than the first material. The hole of the first leaf spring has one or more grooves close to the portion through which the riveting portion passes, and the flattened riveting portion fills the grooves.

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