JP2011154886A - Movable contact device, its manufacturing method, and circuit breaker using movable contact device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movable contact device in which fluctuations of sliding friction force with a movable contactor are reduced and a yield of productivity of the movable contact device is improved, its manufacturing method, and a circuit breaker using the movable contact device. <P>SOLUTION: The movable contact device 1 has a movable contact 2a installed at the tip part of a movable contactor 2, and a rotation end 2b of the movable contactor 2 is pinched from the both sides by a pair of arms 3a of a mover receptacle 3, and is supported movably by a connecting pin 4 to a hole 3b. Further, a slit 3 is provided along the center line 3d at the base part 3c of the mover receptacle 3, the pair of arms 3a are connected by a connecting part 3f, and a fixing hole 3g to fix to a case is provided, and furthermore, the movable contactor 2 is pressed by a spring 5 from the outside of the arms 3a and is pinched elastically at the sliding surface 3h and electrically connected to the mover receptacle 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a movable contact device for electrically connecting a movable contact and a mover receiver fixed to a housing in a circuit breaker or the like used in a power circuit, a manufacturing method thereof, and a circuit using the movable contact device. It relates to circuit breakers.

  The circuit breaker incorporates a movable contact device that electrically connects a movable contact that is driven by an opening / closing mechanism to perform an opening / closing motion and a connection conductor fixed to the housing.

  For example, in a conventional movable contact device used for a circuit breaker, as disclosed in Patent Document 1, a connection conductor 33 shown in FIG. 6 (corresponding to a mover receiver in the present application. Is formed using a material having excellent conductivity, such as copper, which is formed by bending a plate material by pressing or the like, and a base portion attached to the main body case, and a tip from the base portion. The pair of arms 33a are bent in parallel and face each other, and the pair of arms 33a elastically sandwich the end of the movable contact 31 and are pressed by springs 37 from both sides. The movable contact 31 is connected to the movable receiver 33 so as to be rotatable about a shaft or the like. As a result, the necessary contact area and contact pressure are secured between the movable element receiver and the movable contact element, and the movable contact element 31 and the movable element receiver 33 are electrically connected via the contact portion.

JP-A-4-19938

  In general, a mover receiver that is a part of a current-carrying path of a circuit breaker requires a predetermined cross-sectional area to ensure a current-carrying capacity when the circuit is closed. Then, when connecting the movable contact and the movable receiver, the ends of the movable contact are elastically sandwiched by the pair of arms of the deflected movable receiver and pressed by springs from both sides. Is fixed. The pair of arms of the armature receiver is formed by bending a copper plate, but for electrical connection, the armature contact must be sufficiently bent to allow contact, The amount of bending is ensured by making the length sufficiently long.

  However, in the prior art, the conventional mover receiver is composed of a base portion attached to the main body case and a pair of arms whose front ends are bent in parallel to face each other, and the arm portions are U-shaped. Therefore, the contact surface is less bent and the contact pressure spring must be strengthened to ensure the necessary contact pressure. Therefore, the sliding frictional force with the movable contact may increase. For this reason, in order to reduce the sliding frictional force, it is necessary to increase the length of the arm, and there is a problem in that the contact pressure due to the bending of the arm varies and the yield of the movable contact device decreases.

  The present invention has been made to solve the above-described problem, and a movable contact device that reduces the variation in sliding frictional force with the movable contact and improves the productivity yield of the movable contact device, and the same It is an object of the present invention to provide a circuit breaker using a manufacturing method and a movable contact device.

  In order to solve the above-described problems, the movable contact device of the present invention is movable by sliding contact, with the movable contact and one end of the movable contact being pivotally sandwiched from both sides by a pair of arms. A movable element receiver electrically connected to the contact, and a base portion of the movable element receiver is provided along a center line of the base portion, leaving a coupling portion provided on the opposite side of the side holding the movable contact element. Thus, a slit is formed.

  In the method of manufacturing the movable contact device according to the present invention, the mover receiver is assembled by being punched from a conductive plate by a press and bent so that a pair of arms formed on both sides of the slit face each other. It is characterized by.

  The circuit breaker of the present invention is characterized in that the movable contact device or the movable contact device made by the manufacturing method is used.

  According to the movable contact device of the present invention, the connecting portion provided at the base portion of the mover receiver is formed into a plastically deformable thickness and a narrow shape, so that the arm of the mover receiver can be attached when the movable contactor is assembled. There is no need to bend, and the movable element receiver and the movable contact can be elastically sandwiched and slidably contacted, and the thickness variation and material characteristic variation of the movable contact can be absorbed by the folding structure. Therefore, even if the allowable deflection amount on the contact surface with the movable contact is small, the influence thereof is reduced, and a remarkable effect that electrical contact with high reliability can be obtained can be expected.

  Moreover, according to the manufacturing method of the movable contact apparatus of this invention, the effect that manufacture of a needle | mover receiver is easy and a thing with few dispersion | variation in a characteristic can be expected.

  Further, according to the circuit breaker of the present invention, there is little variation in product characteristics, and improvement in product productivity can be expected.

1 is a schematic perspective view of a movable contact device in a first embodiment. FIG. 3 is a development view of the movable contact device of the first embodiment before processing the mover receiver. FIG. 4 is a schematic perspective view showing an assembly procedure of the movable contact device in the first embodiment. It is a schematic perspective view of the circuit breaker in Embodiment 2. It is a detailed sectional view of a circuit breaker in the second embodiment. It is a schematic perspective view which shows the conventional movable contact apparatus.

  Hereinafter, a movable contact device and a circuit breaker according to an embodiment of the present invention will be described with reference to FIGS.

Embodiment 1 FIG.
FIG. 1 is a schematic perspective view of the movable contact device according to the first embodiment, FIG. 2 is a development view before processing of the mover receiver, and FIG. 3 is a diagram for explaining an assembly procedure of the movable contact device. is there.

  In FIG. 1, reference numeral 1 denotes a movable contact device. A movable contact 2 a is attached to a movable contact 2 and a tip of the movable contact 2, and a rotating end 2 b of the movable contact 2 is a pair of mover receivers 3. The arm 3a is sandwiched from both sides, and is rotatably supported by the connection pin 4 in the hole 3b. The base 3c of the mover receiver 3 is provided with a slit 3e along the center line 3d. A pair of arms 3a are connected by the connecting portion 3f, and a fixing hole 3g for fixing to the housing is provided. Further, the movable contactor is pressed on the sliding surface 3h by being pressed by the contact pressure spring 5 from the outside of the arm 3a. 2 is elastically clamped and is electrically connected to the mover receiver 3.

  Further, the connecting portion 3f of the mover receiver 3 has a thickness and a narrow shape capable of plastic deformation.

  First, with reference to FIG.2 and FIG.3, the assembly method of a movable contact apparatus is demonstrated. FIG. 2 shows a developed view of the mover receiver 3 before processing. The arm 3a is arranged symmetrically across a slit 3e provided along the center line 3d, and a connecting portion 3f is provided at one end of the base portion 3c. Is provided. Furthermore, the fixing hole 3g for fixing to a housing | casing is also provided. 3i and 3j indicated by broken lines are lines indicating the positions for bending. In general, the mover receiver 3 is stamped by pressing a conductive plate such as copper.

Next, the assembly procedure of the movable contact device 1 will be described with reference to FIG. In FIG. 2, the arm 3a is raised at a right angle with respect to the base 3c by first folding it from the base 3c at the fold line 3i indicated by a broken line and then folding it back at the fold line 3j. The arms 3a of both wings are widened by a thin or narrow connecting portion 3f, and the movable contact 2 is loosely fitted into the hole 3b of one arm 3a through the connection pin 4 through the through hole (not shown) of the rotating end 2b. Hold in a safe state. Subsequently, in a state where the connecting portion 3f is bent and parallel to the one arm 3a, the other arm 3a is similarly passed through the connection pin 4. In this way, the assembly of the movable contact device 1 shown in FIG. 1 is completed. The contact pressure spring 5 is attached when it is incorporated into a circuit breaker.

  Next, the operation of the movable contact device in the first embodiment will be described with reference to FIGS.

  The arm 3 a of the mover receiver 3 is configured such that the rotating end 2 b of the movable contact 2 is elastically sandwiched between the contact pressure springs 5 and is brought into sliding contact with the side surfaces 2 d on both sides of the movable contact 2. And the movable contact 2 are slidably electrically contacted to ensure an energization path having a necessary energization capacity when the circuit is closed. Thereby, even when the movable contact 2 is rotated, the movable contact 2 and the movable receiver 3 can be stably slidably contacted.

  The length L of the arm 3a of the mover receiver 3 does not need to be sufficiently bent by the contact pressure spring 5 when it is connected to the movable contact 2, so that it does not need to be determined in consideration of the amount of bending. Only a minimum length is required. Thereby, a movable contact apparatus can be made small and the improvement of a material yield is possible.

  As described above, in the movable contact device in the first embodiment, the connecting portion provided at the base portion of the mover receiver is formed into a plastically deformable wall thickness and a narrow shape so that the mover can be assembled when the movable contactor is assembled. There is no need to bend the arm of the support, and the mover receiver and the movable contact can be elastically pinched and slidably contacted. Since it can be absorbed by the structure, even if there is little allowable deflection at the contact surface with the movable contact, it will be less affected and expected to have a remarkable effect that highly reliable electrical contact can be obtained. it can.

  Further, in the movable contact device in the first embodiment, it is possible to reduce the sliding frictional force with the movable contact, and it is possible to shorten the length of the arm for securing the amount of bending, and the amount of material used In addition, the variation in electrical characteristics can be improved and the productivity yield can be expected to be improved.

  In the first embodiment, the case where the contact pressure spring is pressed from both sides of the outer side surface of the arm of the mover receiver is described. However, the side surface of one arm is fixed and only the side surface of the other arm is contact pressure. The case where it presses with a spring may be sufficient.

Embodiment 2. FIG.
FIG. 4 is a schematic perspective view of a circuit breaker according to Embodiment 2, and FIG. 5 is a detailed cross-sectional view of the circuit breaker.

  In FIG. 4, the housing 11 of the circuit breaker 10 for three phases is configured by integrally combining a base 12 and a cover 13 made of a synthetic resin material with screws (not shown). Inside the base 12, a power supply side terminal 14 connected to the power supply side of a three-phase electric circuit (not shown) opened and closed by the circuit breaker 10, and a load side connected to the load side of the electric circuit described above The terminal 15 is fixed. The movable contact device 1 according to the first embodiment is disposed between the power supply side terminal 14 and the load side terminal 15.

  Next, operation | movement of the circuit breaker of Embodiment 2 is demonstrated using FIG.

  A fixed contact 16 is fixed to the end of the power supply terminal 14. The cross bar 17 formed of a synthetic resin material is rotatably supported on the base 12. As shown in FIG. 1, a mover receiver 3 formed by bending a conductive plate such as copper has a base 3c attached to the base 12 with a screw (not shown) and a right angle from the base 3c. A pair of arms 3a that are raised and have opposite ends parallel to each other, and a sliding surface 3h of a pair of projecting portions projecting in opposite directions from one end of the pair of arms 3a. The movable contact 2 has a movable contact 2a fixed to the tip, and the rotating end 2b of the rear end is sandwiched between the contact surfaces 3h of the pair of arms 3a of the movable receiver 3 and is attached to the rotating end 2b. The provided through hole is loosely fitted by the connection pin 4, and the movable contact 2 is rotatably held.

  The contact pressure spring 5 that rotatably holds the movable contact 2 includes an outer side surface of the pair of arms 3a of the movable member receiver 3 in which the inner end surface of the coil spring portion 5a holds the movable contact 2, and an outer end surface. It is fitted in a compressed state between the wall surfaces of the recesses (not shown) of the cross bar 17, and the side surfaces of the movable contactor 2 from the outside of the sliding surfaces 3h of the pair of arms 3a by the pair of coil spring portions 5a. The contact pressure of the required connecting portion is obtained by pressing the spring foot, the spring foot portion 5c engages with a locking portion (not shown) of the cross bar 17, and the arm spring portion 5b is moved to the movable contact 2. A rotational moment is given to the movable contact 2 by a moment generated on the back surface 2c of the arm, and the contact spring 5b generates a contact pressure between the fixed contact 16 and the movable contact 2a.

  In the circuit breaker 10, when energized, the arm 3 a of the mover receiver 3 of the movable contact device 1 elastically holds the rotating end 2 b of the movable contact 2 by the contact spring 5. Since stable sliding contact can be obtained with the side surfaces 2d on both sides of the power source, the contact between the movable contact 2a and the fixed contact 16 makes it possible to realize good electrical connection between the power supply side terminal 14 and the load side terminal 15. .

  Thus, in the circuit breaker according to the second embodiment, by using the movable contact device according to the first embodiment, the movable element receiver and the movable contact element can be elastically sandwiched and slidably contacted. It is possible to expect a remarkable effect that electrical contact with high reliability can be obtained during energization.

  Further, according to the circuit breaker of the second embodiment, there is little variation in product characteristics, and an improvement in product productivity can be expected.

  In the second embodiment, the case where the movable contact device is applied to a circuit breaker has been described. However, the present invention can also be applied to other electric devices that involve conduction and interruption of an electric circuit.

  Moreover, in the figure, the same code | symbol shows the same or an equivalent part.

DESCRIPTION OF SYMBOLS 1 Movable contact apparatus 2 Movable contactor 2a Movable contact point 2b Rotating end 3 Movable element receiver 3a Arm 3b Hole 3c Base part 3e Slit 3f Connection part 3h Sliding surface 4 Connection pin 5 Contact pressure spring 10 Circuit breaker 14 Power supply side terminal 15 Load side terminal 16 Fixed contact

Claims (5)

A movable contact;
A movable element receiver that rotatably holds one end of the movable contact element from both sides by a pair of arms provided at a base, and is electrically connected to the movable contact element by sliding contact;
A movable part characterized in that a slit is formed in the base part of the movable part receiver along the center line of the base part, leaving a connecting part provided on the side opposite to the side holding the movable contactor. Contact device.   2. The movable contact device according to claim 1, wherein the movable element receiver has a thickness and a narrow shape in which the connecting portion can be plastically deformed.   The movable side according to claim 1 or 2, wherein an outer side surface of at least one arm of the movable element receiver is pressed by a spring, and the arm is elastically adhered to the movable contact element. Contact device.   4. The movable contact device according to claim 1, wherein the mover receiver is punched from the conductive plate by a press so that a pair of arms formed on both sides of the slit face each other. A method of manufacturing a movable contact device, wherein the movable contact device is assembled by being bent.   The circuit breaker characterized by using the movable contact apparatus in any one of Claims 1-3, or the movable contact apparatus made by the manufacturing method of Claim 4.

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