JP5134085B2 - Circuit breaker movable contact device - Google Patents

Description

  The present invention relates to an improvement of a movable contact device in a circuit breaker.

  As is well known, a circuit breaker such as a circuit breaker for wiring or a circuit breaker includes a power supply side terminal connected to the power supply side of the distribution circuit, a load side terminal connected to the load side of the distribution circuit, and a power supply A movable contact device including a movable contact provided with a fixed contact provided on the side terminal and a movable contact connected to the load side terminal and capable of contacting or separating from the fixed contact, and driving the movable contact device An open / close mechanism that moves the movable contact to or away from the fixed contact, an operation handle that manually operates the open / close mechanism, and an automatic open / close when a predetermined overcurrent or leakage current flows through the power distribution circuit And an automatic trip device that drives the mechanism to shut off the power distribution circuit.

  Conventionally, as a movable contact device for such a circuit breaker, a plurality of movable contactors each having a movable contact at one end and having the other end penetrated by a shaft pin, Insulator crossbar that holds the shaft pin and supports each movable contactor rotatably around the shaft pin, and the movable contactor sandwiching the other end of the movable contactor from both sides in the axial direction of the shaft pin A holding piece made of a conductor that is in sliding contact with the other end of the wire, a flexible conductor having one end connected to the holding piece and the other end connected to the load side terminal, and movable when the circuit breaker is turned on. A configuration including a torsion coil spring that biases the movable contact in a direction in which a predetermined contact pressure is applied to the contact has been proposed (for example, see Patent Document 1).

  In the conventional movable contact device disclosed in Patent Document 1, a notch portion is formed in the above-described sandwiching piece, and a shaft pin penetrating the other end portion of the movable contact by the notch portion is provided. It is configured to receive. Further, the torsion coil spring described above is a connection in which one end portion is fixed to the crossbar and the shaft pin is inserted to form a compression spring and the other end portions of these coil portions are integrally connected. The connecting piece is configured to constantly urge the movable contact in the ON direction by pressing the connecting piece against the above-described movable contact.

  According to the conventional movable contact device described in Patent Document 1, because it is configured to receive the shaft pin that penetrates the other end of the movable contact by the notch formed in the clamping piece, In a state where the movable contact is held on the crossbar by the shaft pin, the flexible conductor can be connected to the movable contact via the sandwiching piece. Further, the contact state between the movable contact and the sandwiching piece can be stabilized by pressing the sandwiching piece against the movable contact by the coil portion of the torsion coil spring, and the movable contact rotates around the shaft pin. In the meantime, it is possible to keep the movable contact and the flexible conductor in an electrically good contact state.

JP 2001-68008 A

  In the conventional movable contactor device for a circuit breaker disclosed in Patent Document 1, as one of the methods for assembling the movable contactor device, the movable contactor, the torsion coil spring, and the shaft pin are combined with each other. There is a method of fixing the pin to the cross bar and inserting the clamping piece between the torsion coil spring and the movable contact so that the notch of the clamping piece connected to the flexible conductor receives the shaft pin. In this method of assembling the movable contact device, the torsion coil spring is sandwiched between the movable contact and the crossbar, and the coil portion of the torsion coil spring is compressed to generate an urging force as a compression spring. Yes. Therefore, in order to insert the clamping piece between the torsion coil spring and the movable contact, the clamping piece is slid on the side of the movable contact while the clamping piece is pressed against the side of the movable contact by the torsion coil spring. Will be done. As a result, scratches may occur on the side surface of the movable contact and the inner surface of the holding piece.

  On the other hand, as another method for assembling the movable contact device, there is a method in which the movable contact and the sandwiching piece are assembled together in advance, and then the movable contact and the sandwiching piece are attached to the crossbar. In the case of this method of assembling the movable contact device, when the movable contact and the clamping piece combined together in advance are attached to the cross bar, the clamping piece may fall off the movable contact.

  The present invention has been made in order to solve the above-described problems in the movable contact device of the conventional circuit breaker. The movable contact device can be easily assembled, and the number of components can be reduced. The object of the present invention is to provide a movable contactor device with few circuit breakers.

A movable contact device for a circuit breaker according to the present invention includes a pair of connecting conductor portions opposed to each other with a cross bar provided with a recess having an opening on a peripheral surface thereof and supported rotatably about an axis. A movable contact support member in which at least a part of the pair of connection conductors is fitted in the recess of the crossbar; a movable contact at one end; and the other end connected to the pair of connection conductors. A movable contact that is movably supported; and a contact pressure spring that urges the movable contact to apply a contact pressure to the movable contact when the movable contact and a fixed contact provided in a circuit breaker are in contact with each other. A movable contactor device for a circuit breaker comprising: the movable contactor, wherein the other end portion is disposed between the pair of connecting conductor portions, and both side surfaces of the other end portion are the pair of the pair. Each of the contact pressure springs is slidably in contact with the inner surface of the connecting conductor portion, A pair that is fitted between the outer side surfaces of each of the pair of connection conductors and the side wall of the recess of the crossbar and biases the pair of connection conductors toward the other end of the movable contact. The coil springs and the one ends of the pair of coil springs are connected to each other and extend toward one end of the movable contact to contact the movable contact and apply the contact pressure. An arm-shaped spring portion that urges the movable contact, and extends from the other end of each of the pair of coil springs in the opposite direction to the one end of the movable contact, when the contact pressure spring is fitted. A pair of feet that abut against the wall surface of the recess of the crossbar, and the recess of the crossbar includes a spring holding wall that abuts at least a part of the outer peripheral portion of the coil spring portion and holds the coil spring portion. A coil spring portion of the contact pressure spring is provided on the cross. In the state of being fitted in the depressed portion, the outer peripheral portion is in contact with the spring holding wall of the depressed portion, the arm-shaped spring portion is in contact with the back surface of the movable contact, and the foot portion is in the depressed portion. The coil spring portion is pressed against the spring holding wall of the depressed portion and the outer diameter thereof is held.
Further, the movable contact device for a circuit breaker according to the present invention comprises a pair of connections facing each other with a gap between a crossbar provided with a recess having an opening on the peripheral surface and supported rotatably about an axis. A movable contact support member having a conductor portion, at least a part of the pair of connection conductor portions being fitted in the recess of the crossbar, and a movable contact at one end and the other end being the pair of connection conductors A contact pressure that urges the movable contact to apply a contact pressure to the movable contact when the movable contact is rotatably supported on the movable contact and a fixed contact provided on the circuit breaker. A movable contactor device for a circuit breaker comprising a spring, wherein the movable contactor has the other end disposed between the pair of connecting conductors, and both side surfaces of the other end are The contact pressure springs slidably contact the inner side surfaces of the pair of connection conductor portions, respectively. The pair of connecting conductor portions are fitted between the outer side surfaces of the pair of connecting conductor portions and the side walls of the recesses of the crossbar, and bias the one pair of connecting conductor portions toward the other end portion of the movable contact. A pair of coil springs and one end of each of the pair of coil springs are connected to each other and extend toward one end of the movable contact so as to contact the movable contact and apply the contact pressure. The arm-shaped spring portion that urges the movable contact and the other end of each of the pair of coil springs extend in the opposite direction to the one end of the movable contact, and when the contact pressure spring is fitted. A pair of legs that abut against the wall surface of the recess of the crossbar, the recess of the crossbar penetrating the crossbar from the opening in a direction perpendicular to the axial direction of the crossbar And open from the both sides in the axial direction of the through hole that opens at the opening. And a said coil spring portion recess of the pair having a spring retention wall in at least a part of the outer peripheral portion in contact to hold the coil spring portions together with respectively recessed in the axial direction, the movable contactor, At least a part of the other end is inserted into the through hole, the one end penetrates the through hole and protrudes from the peripheral surface of the crossbar, and at least a part of the pair of connection conductors is the through hole. And the pair of coil spring portions are respectively fitted between an outer surface of the pair of connecting conductor portions and a side wall of the pair of recessed portions, and the through hole is formed by the movable contact. A concave groove for restricting movement of the child in the axial direction is provided.

  According to the movable contactor device for a circuit breaker according to the present invention, the movable contact has the other end disposed between the pair of connection conductors, and both side surfaces of the other end are the pair of connection conductors. The contact pressure springs are slidably in contact with the inner side surfaces of the pair of connection conductor portions, and are fitted between the outer side surfaces of the pair of connection conductor portions and the side walls of the recesses of the crossbar. A pair of coil spring portions that are biased toward the other end portion of the movable contact and one end portions of the pair of coil spring portions are connected to each other and extend toward one end portion of the movable contact. An arm-shaped spring portion that urges the movable contact to abut against the movable contact to apply a contact pressure to the movable contact, and the movable contact from each other end of the pair of coil spring portions One end of the cross bar extends in the opposite direction to the side of the recess of the crossbar when the contact pressure spring is fitted. And the recess of the cross bar includes a spring holding wall that holds the coil spring part in contact with at least a part of the outer peripheral part of the coil spring part. When the contact pressure spring is fitted into the recess, the foot portion of the contact pressure spring comes into contact with the wall surface of the recess, so that it is not necessary to perform the springing operation of the foot portion after the contact pressure spring is installed, and the assembly time can be shortened. Moreover, since the contact pressure spring is held by a spring holding wall provided in the recess of the cross bar, a pin for engaging the movable contact and the movable contact support member becomes unnecessary, and the number of parts can be reduced. It is.

It is sectional drawing of the circuit breaker provided with the movable contact device by Embodiment 1 of this invention. It is sectional drawing which shows the movable contactor apparatus by Embodiment 1 of this invention. It is a disassembled perspective view which decomposes | disassembles and shows the movable contact device by Embodiment 1 of this invention for 1 pole. FIG. 4 is an exploded perspective view showing the movable contact device according to the first embodiment of the present invention with a crossbar broken from a breaking line A in FIG. 3. FIG. 4 is an exploded perspective view showing the movable contact device according to the first embodiment of the present invention with a crossbar broken from a broken line B in FIG. 3. It is sectional drawing which shows the cross bar in the movable contactor apparatus by Embodiment 1 of this invention. It is sectional drawing which fractures | ruptures and shows the movable contactor apparatus by Embodiment 1 of this invention. It is explanatory drawing explaining the structure of the movable contactor apparatus by Embodiment 1 of this invention.

Embodiment 1 FIG.
First, a circuit breaker including a movable contact device according to Embodiment 1 of the present invention will be described. In FIG. 1, a base 1 and a cover 2 formed of a synthetic resin material are combined together by a screw (not shown) to constitute a housing of a circuit breaker 100 for three phases. Inside the base 1 are a power supply side terminal 3 connected to the power supply side of a three-phase electric circuit (not shown) opened and closed by a circuit breaker 100, and a load side connected to the load side of the electric circuit described above. Terminal 4 is fixed. A fixed contact 5 is fixed to the end of the power supply side terminal 3.

  The cross bar 6 made of a synthetic resin material is supported on the base 1 so as to be rotatable around its axis. As will be described later, the movable contact 8 having the movable contact 7 at one end is inserted into a later-described recess of the cross bar 6 as described later. The contact pressure spring 9 is fitted in the aforementioned recess of the cross bar 6 and urges the movable contact 8 so as to apply a contact pressure to the movable contact 7 as will be described later. The movable contact supporting member 10 has a base 11 fixed to the base 1 and a pair of connecting conductors 101 and 102 that rise substantially vertically from the base 11 as will be described later (only 101 is shown in FIG. 1). And the inner side surfaces of these connection conductor portions 101 and 102 are slidably electrically connected to the side surface of the other end portion of the movable contact 8 and the pair of connection conductor portions 101 and 102 Thus, the other end of the movable contact 8 is rotatably supported.

  The base 11 of the movable contact support member 10 is connected to the load side terminal 4 via the load side connection conductor 41. The cross bar 6, the movable contact 7, the movable contact 8, the contact pressure spring 9, and the movable contact support member 10 constitute the movable contact device 12 according to the first embodiment of the present invention. Yes. Details of the configuration of the movable contact device 12 will be described later.

  One end of the lower link 13 is rotatably connected to the cross bar 6, and the other end is rotatably connected to one end of the upper link 14. One end portion of the operation mechanism portion 15 is rotatably supported by the base 1, and an operation handle 16 that is operated by an operator is fixed to the other end portion. The other end of the upper link 14 is rotatably connected to the other end of the operation mechanism unit 15. One end of the toggle spring 17 formed by the tension coil spring is fixed to the connecting portion between the lower link 13 and the upper link 14, and the other end is fixed to the other end of the operation mechanism portion 15.

  The upper link 14, the lower link 13, and the toggle spring 17 constitute a so-called toggle link mechanism. Now, assuming that the operating handle 16 is operated to the left in the figure by the operator from the state where the handle 16 is in the closed position, which is the right side in the figure, as shown in the figure, the operating mechanism unit 15 moves its one end. It rotates in the direction of the open position on the left side of the figure as the center. As a result, one end of the toggle spring 17 moves to the left in the drawing along with the rotation of the operation mechanism 15 and moves to the left beyond the connection point between the upper link 14 and the operation mechanism 15.

  At this time, the illustrated alignment relationship between the upper link 14 and the lower link 13 is broken, and the lower link 13 is rapidly pulled upward in the drawing by the pulling force of the toggle spring 17. In the process of this operation, the cross bar 6 connected to one end of the lower link 13 rapidly rotates counterclockwise, and the movable contact 8 rotates counterclockwise to move the movable contact 7. Separate from the fixed contact 5. As a result, the electric circuit is interrupted.

  On the other hand, if the handle 16 in the open position is operated to the closed position on the right side of the figure, the operation mechanism unit 15 rotates around the one end portion in the direction of the closed position on the right side of the figure. As a result, one end of the toggle spring 17 moves to the right in the drawing along with the rotation of the operation mechanism 15 and moves to the right beyond the connection point between the upper link 14 and the operation mechanism 15. Thereby, the upper link 14 and the lower link 13 are aligned in the state shown in the figure by the pulling force of the toggle spring 17. In the process of this operation, the lower link 13 rapidly rotates the cross bar 6 in the clockwise direction, rotates the movable contact 8 in the clockwise direction, and contacts the movable contact 7 with the fixed contact 5. Thereby, the electric circuit is closed. The movable contact 8 is urged by a contact pressure spring 9 and applies a predetermined contact pressure to the movable contact 7 that is in contact with the fixed contact 5.

  The automatic trip device 18 is engaged with a part of the upper link 14 when the operation handle 16 is in the illustrated closed position, that is, when the movable contact 7 is in contact with the fixed contact 5 to close the electric circuit. Thus, the upper link 14 is latched to rotate counterclockwise around the other end. The automatic trip mechanism 18 is provided with, for example, a time trip trip mechanism using bimetal and an instantaneous trip mechanism using an electromagnet.

  When an overcurrent of a predetermined value or more continues to flow in the electric circuit for a predetermined time or longer, the time trip mechanism of the automatic trip device 18 operates to release the aforementioned latch. As a result, the upper link 18 rapidly rotates counterclockwise around the other end due to the pulling force of the toggle spring 17, and the lower link 13 is rapidly pulled upward in the figure, and at the same time the cross bar 6 is counterclockwise. Rotate in the direction. As a result, the movable contact 7 of the movable contact 8 is rapidly separated from the fixed contact 5 and interrupts the electric circuit. When an excessive current such as a short-circuit current flows in the electric circuit, the instantaneous trip mechanism of the automatic trip device 18 operates to release the aforementioned latch. As a result, the electric circuit is instantaneously interrupted by the same operation as that of the time-delay trip mechanism described above.

  Next, the configuration of the movable contact device 12 according to Embodiment 1 of the present invention will be described in detail. 2 to 7, the cross bar 6 is formed of a synthetic resin material as described above, and both end portions in the axial direction are rotatably supported by the base 1. The cross bar 6 has three movable contact mounting portions 60 for mounting the movable contact 8, the contact pressure spring 9, and the movable contact receiving member 10 corresponding to the U phase, V phase, and W phase, respectively. Are provided at equal intervals W.

  The cross bar 6 includes a concave portion 600 having an opening 6001 that opens on the peripheral surface of the cross bar in each of the movable contact mounting portions 60 described above. The recess 600 includes a through hole 601 that penetrates from the opening 6001 in a direction perpendicular to the axial direction of the crossbar 6, and openings 6021 and 6031 that are integrated with the opening 6001. A pair of recessed portions 602 and 603 that are recessed in the axial direction from both sides of the hole 601 in the axial direction are provided.

  As well shown in FIG. 5, the through hole 601 includes an opening 6012 that opens on the peripheral surface of the cross bar 6 on the opposite side to the opening 6011, and the above-described opening 6012 from the middle of the through hole 601. A concave groove 6013 extending to the top is provided. Further, the pair of depressed portions 602 and 603 are U-shaped that abut against the outer peripheral portions of a pair of coil spring portions 91 and 92 of a contact pressure spring 9 to be described later and hold the outer diameters of the coil spring portions 91 and 92, respectively. And a flat wall surface 6023 connected to the spring holding wall 6022. Although the spring holding wall and the flat wall surface of the depressed portion 603 are not shown in the drawing, they are formed in the same manner as the spring holding wall 2022 and the wall surface 6023 of the depressed portion 602. In addition, the internal space of the above-mentioned through-hole 601 and a pair of depression part 602,603 is mutually connected like illustration.

  Both side walls of the concave groove 6013 provided in the above-described through hole 601 protrude from the both side walls of the through hole 601 to the inside of the through hole 601 through the inclined surface 6014 (FIG. 5 shows only one side wall. Is displayed, but the other side wall is also formed in the same manner). The groove width of the concave groove 6013 is formed to be slightly larger than the thickness of the conductive member constituting the movable contact 8, and therefore the concave groove 6013 is formed on the cross bar 6 in the movable contact 8. This serves to regulate the movement of the lens in the axial direction.

  The movable contact support member 10 includes a base portion 11 fixed to the base 1 of the circuit breaker 100, and a pair of connection conductor portions 101 and 102 that are vertically raised from the base portion 11 and have tip portions facing each other in parallel. The pair of protrusions 103 provided so as to protrude from the opposing wall surfaces of the pair of connection conductors 101 and 102 (only the base portion 103 of the protrusion of the connection conductor 101 is shown in FIGS. 3 to 5). Display). The base portion 11 of the movable contact support member 10 is inserted into the rising portions of the connecting conductor portions 101 and 102 by inserting the aforementioned load side connecting conductor 41 against the elastic force of the rising portions. The side connection conductor 41 is electrically connected.

  The movable contact 8 has a movable contact 7 fixed to one end and a through hole 81 at the other end. In the through hole 81 of the movable contact 8, the above-described pair of protrusions provided on the connection conductor portions 101 and 102 of the movable contact support member 10 are inserted from both sides of the movable contact 8. Thereby, the other end part of the movable contact 8 is rotatably supported by the movable contact support member 10. The inner side surfaces of the connecting conductor portions 101 and 102 of the movable contact support member 10 are in electrical contact with both side surfaces of the movable contact 8 so as to be slidable. Therefore, this configuration eliminates the need to connect a shunt wire made of a flexible conductive wire between the movable contact 8 and the load side connection conductor 41, and a so-called shuntless energization connection structure is provided. It is composed.

  The contact pressure spring 9 is configured as a double torsion type torsion coil spring. That is, the contact pressure spring 9 includes a pair of coil spring portions 91 and 92 as compression coil springs wound with a predetermined pitch angle, and a pair of the coil spring portions 91 and 92, respectively. An arm-like spring portion that connects the one end portions to each other, extends toward one end portion of the movable contact 8 and abuts against the back surface 82 of the movable contact 8 to urge the movable contact 8 to apply the contact pressure. 93 and the other end portions of the pair of coil spring portions 91 and 92 extend in the opposite direction to the one end portion side of the movable contact 8 and are depressed when the contact pressure spring 9 is fitted into the depressed portions 602 and 603. And a pair of feet 911 and 921 in contact with the wall surface 6023 of the portions 602 and 603.

  As shown in FIG. 8, the coil spring portion 91 of the contact pressure spring 9 is fitted in the depressed portion 603 of the cross bar 6, and the outer peripheral portion thereof is a spring holding wall (not shown) of the depressed portion 603 (not shown). (Not shown), the arm-shaped spring portion 93 comes into contact with the back surface of the movable contact 8 at point E, and the foot portion 911 hits the wall surface (not shown) of the depressed portion 603 at point F. Touch. As a result, the coil spring portion 91 is pressed in the H direction against the spring holding wall of the depressed portion 603 at the point G, and the outer diameter thereof is held. Therefore, it is possible to hold the outer diameter of the coil spring portions 91 and 92 and to attach the shaft pin to the cross bar 6 without penetrating the shaft pins through the coil spring portions 91 and 92 as in the prior art.

  Next, an assembling method of the movable contact device 12 will be described. 3 to 6, first, the other end of the movable contact 8 is inserted between the pair of connection conductors 101 and 102 of the movable contact support member 10, and the other end of the movable contact 8 is inserted into the other end of the movable contact 8. A pair of projecting portions formed on the inner side surfaces of the pair of connecting conductor portions 101 and 102 are fitted into the formed through holes 81 from both side portions of the movable contact 8.

  Thereafter, the arm-shaped spring portion 93 of the contact pressure spring 9 is brought into contact with the back surface 82 of the movable contact 12, and the axially inner end portions of the pair of coil spring portions 91 and 92 of the contact pressure spring 9 are moved to the movable contact. The outer surfaces of the pair of connecting conductor portions 101 and 102 of the support member 10 are brought into contact with each other. In other words, the contact springs 9 and the other end of the movable contact 8 and the movable contact support member 10 are sandwiched between the connection conductor portions 101 and 102 of the movable contact support member 10 by the pair of coil spring portions 91 and 92. Attach to.

  Next, the outer ends in the axial direction of the pair of coil spring portions 91 and 92 of the contact pressure spring 9 are gripped, and the coil spring portions 91 and 92 are compressed against the spring force, and remain in that state. 3 to 4, the movable contact 8 is inserted into the through hole 601 from the opening 6001 of the cross bar 6 shown in FIGS. 3 to 4, and one end of the movable contact 8 passes through the through hole 601. Project from the opening 6012. At the same time, the contact pressure spring 9 is inserted into the pair of recessed portions 602 and 603 of the crossbar 6 from the respective openings 6021 and 6031 while the coil spring portions 91 and 92 are compressed. A part of the outer peripheral portion of 92 is in contact with the U-shaped spring holding wall 6022 of the respective recessed portions 602 and 603.

  When the contact pressure spring 9 is inserted into the respective recesses 602 and 603 of the cross bar 6, the pair of feet 911 and 921 of the contact pressure spring 9 is inserted into the recesses 602 and 603 of the pair of recesses 603 during the insertion operation. It naturally abuts against the wall surface 6023. Further, when the coil spring portions 91 and 92 of the contact pressure spring 9 are inserted into the recessed portions 602 and 603 and released from the above-described gripping, they are extended in the axial direction by the spring force, and the outer end portions in the axial direction thereof. Comes into contact with the side wall portions of the respective recessed portions 602 and 603. At this time, the coil spring portions 91 and 92 hold the compressed state.

  The axially inner end portion of the contact pressure spring 9 presses the connecting conductor portions 101 and 102 of the movable contact support member 10 toward the both side surfaces of the movable contact 8 by the spring force. As a result, the contact pressure as the shuntless contact portion between the movable contact 8 and the connection conductor portions 101 and 102 of the movable contact support member 10 is maintained, and both are slidable and kept in electrical connection. It is. The assembly work of the movable contact device 12 is thus completed, and the movable contact device 12 shown in FIGS. 2 and 7 is configured.

  As described above, the movable contact device 12 of the circuit breaker according to the first embodiment of the present invention can be mounted on the crossbar 6 with the movable contact 8 and the movable contact supporting member 10 connected. The foot portions 911 and 921 of the contact pressure spring 9 are engaged with the wall surface of the recess only by the operation of compressing the coil spring portions 91 and 92 of the contact pressure spring 9 and inserting them into the recess 600 of the crossbar 6. Since a predetermined rotational moment to the movable contact 8 can be obtained, the springing work of the foot portions 911 and 921 of the contact pressure spring after the contact pressure spring 9 is inserted becomes unnecessary, and the assembly time can be shortened. . Further, since the outer shape of the coil spring portions 91 and 92 of the contact pressure spring 9 is held by the U-shaped spring holding wall 6022 of the recessed portions 602 and 603 that form the recess 600 of the crossbar 6, the contact pressure spring 9 is held. This eliminates the need for a shaft pin or the like to reduce the number of parts. Further, the side surfaces of the movable contact and the inner surface of the connecting conductor portion are not scratched during assembly unlike conventional devices, and the life can be extended.

  The present invention can be used in the field of circuit breakers such as a circuit breaker for wiring and a circuit breaker for wiring.

Claims (5)

  A crossbar having a recess having an opening on the peripheral surface and rotatably supported around an axis, and a pair of connection conductors facing each other with a gap therebetween, at least a part of the pair of connection conductors being A movable contact support member fitted in the recess of the cross bar; a movable contact having a movable contact at one end thereof and rotatably supported at the other end portion by the pair of connection conductor portions; and the movable A movable contactor device for a circuit breaker comprising a contact pressure spring for biasing the movable contact so as to apply a contact pressure to the movable contact at the time of contact between the contact and a fixed contact provided on the circuit breaker. The other end of the movable contact is disposed between the pair of connection conductors, and both side surfaces of the other end are slidably in contact with the inner surfaces of the pair of connection conductors. The contact pressure spring is connected to the outer surface of each of the pair of connection conductor portions and the clamp. A pair of coil springs that are fitted between the side walls of the recesses of the sbar and bias the pair of connecting conductors toward the other end of the movable contact; and a pair of coil springs An arm-like spring portion for connecting the one end portions to each other and extending toward one end portion of the movable contact to urge the movable contact so as to contact the movable contact and apply the contact pressure; A pair of legs that extend from the other end of each of the pair of coil springs in a direction opposite to the one end of the movable contact and abut against the wall surface of the recess of the crossbar when the contact pressure spring is fitted; The recess of the cross bar includes a depressed portion having a spring holding wall that abuts at least a part of the outer peripheral portion of the coil spring portion and holds the coil spring portion, and the coil of the contact pressure spring The spring part is fitted in the depressed part of the crossbar and The abutment part abuts against the spring holding wall of the depression part, the arm-like spring part abuts against the back surface of the movable contact, the foot part abuts against the wall surface of the depression part, and the coil spring part includes the depression part A movable contactor device for a circuit breaker, wherein the outer diameter of the circuit breaker is held by being pressed by a spring holding wall.   The recess of the cross bar includes a through hole that penetrates the cross bar from the opening in a direction perpendicular to the axial direction of the cross bar, and an opening in the opening that extends in the axial direction of the through hole. A pair of depressions that are depressed in the axial direction from both sides and provided with the spring holding wall, and at least a part of the other end of the movable contact is inserted into the through hole. Protrudes from the peripheral surface of the cross bar through the through hole, at least a part of the pair of connecting conductor portions is fitted into the through hole, and the pair of coil spring portions is the pair of coil spring portions. The movable contactor device for a circuit breaker according to claim 1, wherein the movable contact device is fitted between an outer surface of a connection conductor portion and a side wall of the pair of depressions.   The pair of recessed portions includes U-shaped spring holding walls that abut against the outer peripheral portions of the pair of coil spring portions and hold the outer diameter of the coil spring portions. The movable contactor device for a circuit breaker according to claim 2.   The concave portion of the cross bar is inserted into the opening from the opening together with the pair of connection conductors in a state where the pair of coil springs are mounted on the outer surface of the pair of connection conductors. 2. The structure according to claim 1, wherein the contact pressure spring is configured such that the pair of foot portions abuts against a wall surface of the recess when the fitting is performed. 3. A movable contact device for circuit breakers. A crossbar having a recess having an opening on the peripheral surface and rotatably supported around an axis, and a pair of connection conductors facing each other with a gap therebetween, at least a part of the pair of connection conductors being A movable contact support member fitted in the recess of the cross bar; a movable contact having a movable contact at one end thereof and rotatably supported at the other end portion by the pair of connection conductor portions; and the movable A movable contactor device for a circuit breaker comprising a contact pressure spring for biasing the movable contact so as to apply a contact pressure to the movable contact at the time of contact between the contact and a fixed contact provided on the circuit breaker. The other end of the movable contact is disposed between the pair of connection conductors, and both side surfaces of the other end are slidably in contact with the inner surfaces of the pair of connection conductors. The contact pressure spring is connected to the outer surface of each of the pair of connection conductor portions and the clamp. A pair of coil springs that are fitted between the side walls of the recesses of the sbar and bias the pair of connecting conductors toward the other end of the movable contact; and a pair of coil springs An arm-like spring portion for connecting the one end portions to each other and extending toward one end portion of the movable contact to urge the movable contact so as to contact the movable contact and apply the contact pressure; A pair of legs that extend from the other end of each of the pair of coil springs in a direction opposite to the one end of the movable contact and abut against the wall surface of the recess of the crossbar when the contact pressure spring is fitted; The recess of the crossbar includes a through-hole penetrating the crossbar from the opening portion in a direction perpendicular to the axial direction of the crossbar, and opening in the opening portion. from both sides in the axial direction of the coil spring portion with respectively recessed in the axial direction Peripheral portion of at least a portion in contact with a recess of the pair having a spring holding wall for holding the coil spring portion, the movable contactor, at least a portion of the other end the through hole The one end portion penetrates the through hole and protrudes from the peripheral surface of the cross bar, and at least a part of the pair of connection conductor portions is fitted into the through hole, and the pair of coil spring portions Are respectively fitted between the outer surfaces of the pair of connecting conductor portions and the side walls of the pair of recessed portions, and the through hole is a concave groove for restricting the movement of the movable contact in the axial direction. A movable contactor device for a circuit breaker comprising:

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