JPH082911Y2 - Circuit breaker for wiring - Google Patents

Description

[Technical Field] The present invention relates to a circuit breaker for wiring, and more specifically, a trip device driven when an excessive current passes, and a plurality of links and springs mounted on a holding frame. A trip device that trips when the trip device is driven in a set state that stores the spring force, and a contact that is mechanically connected to the trip device and that is inserted into the main circuit along with the trip operation of the trip device. The contact device for opening and closing is a circuit breaker for wiring installed in a fixed position in the housing.

BACKGROUND ART Conventionally, in this type of circuit breaker for wiring, when a very large current such as a short-circuit current is applied, the contacts are opened by electromagnetic repulsion. In order to assist this electromagnetic repulsive force, a spring force acts to increase the contact pressure when the contacts are closed, and when the contacts open, a reversing spring that acts in the direction to open the contacts is used. The one used is provided. However, in the case where a tension spring is used as this kind of reversing spring, the structure tends to be complicated and the assembly is troublesome. On the other hand, in the case of using the compression spring, it is difficult to apply the spring force in a desired direction, and there is a problem that the operation tends to vary.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and its main purpose is to use a compression spring that is easy to assemble and to reverse the action direction of the spring force. Is to provide a circuit breaker for wiring.

DISCLOSURE OF THE INVENTION In the present invention, a tripping device that is driven when an excessive current passes, and a tripping device in a set state in which a plurality of links and springs are mounted on a holding frame and spring force is accumulated A trip device that performs a trip operation when driven, and a contact device that is mechanically connected to the trip device and opens and closes the contact inserted in the main circuit along with the trip operation of the trip device are in place in the housing. In a circuit breaker installed in, a contact device having a movable contact having a movable contact, and a contact rotatably held at a fixed position of a housing for rotatably holding the movable contact. Consists of a crossbar having a holding portion, and a coil-shaped compression spring that is sandwiched between the contact holding portion and the movable contact and that exerts a spring force in a plane orthogonal to the axial direction of the crossbar. It The spring receiving projection protruding from the contact holding portion is inserted into one end of the compression spring, and the other end of the compression spring is provided with a movable contact with respect to the center of rotation of the movable contact. A spring receiving tongue projecting from the opposite end is inserted, and the surface intersects with the edge at an angle exceeding 180 degrees, and the compression spring becomes A spring receiving protrusion is provided so as to straddle the first spring receiving surface and the second spring receiving surface with which the end surface abuts, and the other end surface of the compression spring is connected to the spring receiving pin inserted into the spring receiving tongue of the movable contact. A circuit breaker for wiring that is elastically contacted is disclosed.

(Example) In the following examples, a three-pole type breaker is shown.
As shown in FIG. 1, a trip device 10 that is basically driven when an overcurrent passes, a trip device 40 that performs a trip operation when the trip device 10 is driven, and a trip device 40 that performs a trip operation The contact device 110, which is momentarily opened when the contact is performed, and the arc extinguishing device 130, which extinguishes an arc generated when the contact device 110 is opened, are housed in the housing 1. From the trip device 40
The handle 100 interlocked with protrudes freely. The trip device 10, the contact device 110, and the arc extinguishing device 130 are provided for each pole, and the trip device 40 is provided so as to share three poles. The housing 1 has a base 1a and a base
The cover 100 includes a cover 1b fitted on the cover 1a, and the handle 100 projects outside the housing 1 through a handle insertion hole 2 formed in the center of the cover 1b. Further, an exhaust plate 9 that connects the inside and outside of the housing 1 is fitted on the side surface of the housing 1 on the arc extinguishing device 130 side.

The trip device 10 includes an electromagnetic trip device 10a and a thermal trip device 10b as shown in FIGS. The electromagnetic trip device 10a includes a coil 11, a yoke 12, a plunger 13, a return spring 14, and a bush 15.
Consists of The coil 11 is substantially L-shaped as shown in FIG.
The notch groove 16 is formed by bending a rectangular sheet metal 17 having a U-shaped notch groove 16 .The notch groove 16 includes a lateral groove 16 a running from one end in the longitudinal direction of the sheet metal 17 to the center, and a sheet metal 17. Is formed in such a shape that a longitudinal edge 16b is connected to a vertical groove 16b whose one end is open. This sheet metal 17 is bent into a substantially L-shape via a fold line (a dashed line in FIG. 7) along one side edge of the lateral groove 16a, and a longitudinal center in FIG. A half-turn coil in which a terminal piece 18 is integrally extended at the right end by bending stepwise so that the right end of the sheet metal 17 is higher than the left end through a pair of folding lines running in the direction 11 is formed. Where coil 11
The side piece 11a is closer to the terminal piece 18 along the main electric path, and the side piece 11b is farther from the terminal piece 18 than the vertical piece 11b. Terminal strip 18
A terminal screw hole 19 is formed at the center of the terminal piece, and a screw hole 20 is formed at an end of the terminal piece 18 on the coil 11 side. Also coil
A projecting piece 21 is provided at the tip of the 11 vertical piece 11b. As described above, since the coil 11 is formed by bending the sheet metal 17, the coil 11 can be easily formed by punching and bending.
Can be manufactured. Further, since the terminal piece 18 is integrally extended to the coil 11, the welding work between the terminal piece and the coil unlike the case of using the coil of the winding is unnecessary, and the production efficiency is high. Further, since the coil 11 is bent into an L-shape, the occupied area is smaller than that of the flat coil 11, and the arrangement space is reduced when a plurality of poles are arranged in parallel as in this embodiment. It gets smaller. York 12
As shown in FIG. 5, the vertical strips 12d and 12e extend between the upper and lower three horizontal rows 12a to 12c, which are vertically separated from each other.
Are formed of a magnetic material in a substantially S shape by being integrally connected with each other, and both horizontal pieces of the upper first horizontal piece 12a and the middle second horizontal piece 12b.
Rectangular through holes 22a and 22b are formed in the vertical lines 12a and 12b, respectively. A screw hole 23 is formed in the central portion of the lower third horizontal piece 12c. Since the coil 11 is interposed between the second horizontal piece 12b and the third horizontal piece 12c, the horizontal piece 11a of the coil 11 faces the third horizontal piece 12c and the vertical piece 11b of the coil 11 is provided. And the first vertical piece 12d of the yoke 12 are the horizontal pieces 11a of the coil 11.
The coil 11 and the yoke 12 are arranged so as not to contact each other so as to face each other. The bush 15 is mounted in the through hole 22b formed in the second horizontal piece 12b. Bush 15
Is made of a non-magnetic material such as a synthetic resin molded product in the shape of a rectangular parallelepiped having a slightly depressed upper surface, and has a rectangular through hole 27 in the center.
6, and as shown in FIG. 6, insertion ridges 28 are provided on the entire circumference of the lower surface of the opening peripheral edge of the through hole 27. However,
The bush 15 is fixed to the yoke 12 by press-fitting the insertion protrusion 28 into the through hole 22b of the second horizontal piece 12b. Here, the through hole 27 is formed to have substantially the same size as the through hole 22a of the first horizontal piece 12a. The plunger 13 is made of a magnetic material, and an upper end portion thereof is bent into a substantially L-shape to form a hooking piece 24, and a lower end portion thereof is provided with a spring accommodating recess 25 opened to the side. The vertical width of the spring accommodating recess 25 is the first of the yoke 12.
The width between the horizontal piece 12a and the second horizontal piece 12b is set to be substantially equal. Spring holding projections 26 project from the upper and lower end surfaces of the spring housing recess 25, respectively, and the return spring 14 is mounted between the spring holding projections 26. The lower end of the plunger 13 is a yoke
The through hole 22a and the bush 15 formed in the first lateral piece 12a of 12
The through hole 27 is formed in a rectangular shape in cross section, and is vertically movably inserted into both through holes 22a and 27. Therefore, the plunger 13 is inserted into the yoke 12 having the bush 15 attached thereto, and the return spring 14 is provided with the spring housing recess 25 corresponding to the first horizontal piece 12a and the second horizontal piece 12b of the yoke 12. If the spring 13 is mounted from the side in the spring storage recess 25, the upper and lower ends of the return spring 14 make elastic contact with the first horizontal piece 12a of the yoke 12 and the bush 15 respectively, and the return spring 14 moves when the plunger 13 moves up and down.
Is compressed, and a return force acts on the plunger 13. Thus, the bush 15 and the plunger 13 are attached to the yoke 12.
Since the return spring 14 is finally attached in the state where and are attached, the return spring 15 does not come off during the assembly of the electromagnetic tripping device 10a, and the assemblability is improved. Further, the return spring 14 is connected to the first horizontal piece 12a of the yoke 12 and the bush 15.
Since it is mounted between and and is elastically contacted with both, by the downward pressing force acting on the bush 15 from the return spring 14,
The bush 15 can be prevented from coming off without caulking and fixing the bush 15 to the yoke 12. The lower end of the plunger 13 is disposed between the vertical piece 11b of the coil 11 and the first vertical piece 12d of the yoke 12, and is configured such that the energization of the coil 11 causes the plunger 13 to be attracted downward.
With this configuration, the coil 11 can be finally placed in the yoke 12 from the side of the yoke 12 with the plunger 13 attached to the yoke 12, and compared with the case where the plunger 13 is inserted into the coil 11. As a result, the assemblability is improved. The thermal trip device 10b is coupled to the projecting piece 21 formed at one end of the coil 11.

The thermal release device 10b includes a heater plate 31, a bimetal plate 3
2, and a pressing screw 33. The heater plate 31 and the bimetal plate 32 each have insertion holes 34 and 35 at the lower ends where the protruding pieces 21 are inserted, and the heater plate 31 and the bimetal plate 32 are laminated with the bimetal plate 32 as the electromagnetic trip device 10a side. By inserting the protruding pieces 21 into the insertion holes 34 and 35 and caulking the protruding pieces 21, the heater plate 31 and the bimetal plate 32
It is designed to be fixed integrally to 11. In a state where the heater plate 31 and the bimetal plate 32 are stacked, the upper end of the bimetal plate 32 protrudes above the upper end of the heater plate 31, and the pressing screw 33 is inserted into a screw hole 36 formed in the protruding portion.
Are screwed together so that they can move back and forth. As shown in FIG. 1, a connecting wire 37 made of a braided wire is connected to the upper end of the heater plate 31, and the heater plate 31 is heated by the current supplied to the heater plate 31.
When is heated, the upper end of the bimetal plate 32 is bent toward the electromagnetic trip device 10a. In this way, the heater plate 31 and the bimetal plate 32 can be integrally connected to the coil 11, so that handling at the time of assembly becomes easy. Further, since the pressing screw 33 is movable back and forth, the amount of protrusion from the bimetal plate 32 can be adjusted as necessary.

The trip device 10 configured as described above is the first
As shown in the figure, the terminal strip 18 is disposed so as to be exposed to the outside of the housing 1, and the distal ends of the fixing screws 3 and 4 screwed from the lower surface of the base 1 a have screw holes 20 formed in the terminal strip 18.
The housing 1 is fixed at a fixed position by being screwed into a screw hole 23 formed in the yoke 12. A terminal screw 29 is screwed into the terminal screw hole 19 of the terminal strip 18. The trip device 10 is provided for each pole, and operates independently of each other.

As shown in FIG. 2, the trip device 40 includes a holding frame 41 formed into a shape in which a pair of substantially parallel support plates 41a that are separated from each other on the left and right sides are integrally connected, and each support plate 41a.
The lower end of each is bent inward to form a fixed piece 41b. A fixing plate 47 is arranged on both fixing pieces 41b in a straddling manner, and the fixing screw 5 inserted from the lower surface of the base 1a is screwed into a pair of screw holes 47a formed in the fixing plate 47. The holding frame 41 is fixed at a fixed position of the base 1a. A latch link 51 is pivotally supported by a link pin 52 at an end of the holding frame 41 on the side of the trip device 10.

The latch link 51 has a spring receiving projecting piece 53 projecting downward at a portion closer to the tripping device 10 than the shaft supporting portion, and projecting upward at the end of the spring receiving projecting piece 53 and the holding frame 41. A compression spring (54) is sandwiched between the spring receiving projection (42) provided. A latch piece 55 extends from an end of the latch link 51 near the trip device 10, and the latch piece 55 is
Is inserted into the holding groove 62 formed at the bottom. Latch link 51
At the end, a holding piece 56 extends at an end farther from the trip device 10 than the pivot portion, and the lower end of the holding piece 56 contacts the upper end of the locking lever 71.

The interlocking bar 61 is provided with the pressing piece 63 and the hooking piece 64 projecting in a direction substantially orthogonal to each other at substantially equal intervals from three places in the axial direction, and is substantially orthogonal to the pressing piece 63 at the center in the axial direction. A locking piece 65 is formed so as to protrude in a direction in which the locking bar 61 moves, and both ends of the interlocking bar 61 in the axial direction are rotatably supported at fixed positions on the inner side surface of the housing 1. The pressing piece 63 is arranged corresponding to the tip of the pressing screw 33 of the above-mentioned thermal tripping device 10b, and the hooking piece 64 is arranged on the lower surface side of the hooking piece 24 of the electromagnetic tripping device 10a. However, when the plunger 13 is pulled downward or the bimetal plate 32 bends away from the heater plate 31, the interlock bar 61 rotates counterclockwise in FIG. Here, pressing pieces 63 are provided at three places of the interlocking bar 61.
With the provision of the hooking piece 64, when any one of the tripping devices 10 provided for each pole operates, the interlocking bar 61 rotates to operate the trip device 40. The retaining piece 65 is formed with a holding groove 62 having an open side surface and a distal end surface.
The upper wall of 62 forms an inclined surface 66 that gradually rises and inclines toward the tip of the locking piece 65.

The lower end of the locking lever 71 is pivotally attached to the holding frame 41 by a link pin 72, and the spring receiving protruding piece 73 is positioned above the pivoted portion in a direction away from the trip device 10.
Is protruding. This spring receiving protrusion 73 is a holding frame
A compression spring 74 is sandwiched between a spring receiving protruding piece 43 protruding at a top end of the 41 and approaching the trip device 10.
A notch hole 75 is formed in the locking lever 71, and an inclined piece 76 that rises and inclines in a direction away from the trip device 10 extends from a lower edge of the notch hole 75. A locking projection 82 extending from a cradle 81 is inserted into the cutout hole 75 of the locking lever 71.

The cradle 81 is bent into a substantially U-shape having legs substantially parallel to both support plates 41a of the holding frame 41, and is provided with a link pin.
The lower end is pivotally attached to the holding frame 41 by the pivot 83. As shown in FIG. 8, the shaft protrusion 84 is formed on the inner peripheral surface of the upper end portion of the cradle 81. The shaft protrusion 84 has a cylindrical shape and a part of the peripheral surface of the cylinder is a plane parallel to the axial direction. It is cut off at 85 and is formed into a shape with an arcuate outer surface. The upper end of the first link 91 is rotatably mounted on the shaft projection 84. For the first link 91, the distance between the outer peripheral surfaces of both leg pieces is a cradle.
81 is formed in a substantially U-shape set substantially equal to the distance between the inner peripheral surfaces of the two leg pieces, and at the upper end of the two leg pieces is formed a bearing groove 92 cut out in an arc shape substantially equal in diameter to the shaft projection 84. Have
The bearing groove 92 is rotatably coupled to the shaft protrusion 84. The opening width W ₂ of the bearing groove 92 is larger than the minimum width W ₁ of the shaft protrusion 84 in the plane orthogonal to the axial direction of the shaft protrusion 84.
Is smaller than the diameter W ₃ . However, as shown in FIG. 8 (a), the first link 91 from the direction parallel to the plane 85 of the shaft projection 84 in the plane orthogonal to the axial direction of the shaft projection 84.
Inserting the bearing groove 92 of the shaft projection 84 into the shaft projection 84, and then rotating the first link 91 around the shaft of the shaft projection 84 as shown in FIG. 8B prevents the first link 91 from coming off the cradle 81. It is held so that it can swing in a fixed shape. Here, the position of the plane 85 on the shaft projection 84 is provided at a position where the first link 91 does not fall off the cradle 81 in the operation range of the cradle 81 and the first link 91. With this configuration, the cradle 81 and the first link 91 can be swingably connected without using a link pin, and the configuration is simple and can be prevented from easily disengaging after the two are coupled. is there. At both ends of the cradle 81, pressing protrusions 86 extend from ends opposite to the locking protrusions 82.

The lower end of the first link 91 is, as shown in FIG.
The link 94 is rotatably connected to the upper end of the link 94 by a link pin 93. One end of a tension spring 102 is connected to the link pin 93. The other end of the tension spring 102 is connected to a hook hole 103 at the upper end of the handle link 101. Handle link 101
Is formed in a substantially U-shape opened downward, and an upper end portion is integrally connected to the handle 100 so as to swing as the handle 100 is turned upside down. That is, the lower end portion of the handle link 101 has a substantially U-shaped bearing groove 104 which is opened downward and engages with a shaft projection 44 provided on the outer surface of the support plate 41a of the holding frame 41. It can be swung around the protrusion 44 together with the handle 100. Support plate 41a
A stopper protrusion 45 that restricts the rotation range of the handle link 101 is provided at a position different from the shaft protrusion 44 on the outer surface of the. Further, a pressing pin 105 is attached to a portion of the handle link 101 that protrudes above the holding frame 41. On the upper surface of the lower end of the handle 100, the housing 1
An arc surface 106 is formed along the arc surface 6 formed on the inner peripheral surface around the handle insertion hole 2 at the upper end of the handle. The both arc surfaces 6, 106 are both arcs centered on the shaft projection 44. I have. By the way, a substantially U-shaped connecting groove 95 is formed at the lower end of the second link 94, and the connecting groove 95 is a contact device.
It is connected to 110.

The contact device 110 includes a movable contact 111 provided with a movable contact 112.
And a crossbar 121 for holding the movable contact 111, and a compression spring 113 interposed between the crossbar 121 and the movable contact 11.
And a fixed contact 1 provided integrally with the arc extinguishing device 130 described later.
31 and. The movable contact 111 is connected to the heater plate 31 at the other end of a connection line 37, one end of which is connected to the heater plate 31.
The crossbar 121 is rotatably supported at a fixed position on the inner peripheral surface of the housing 1 and simultaneously drives the movable contact 111 of the other pole. In other words, the interlocking bar described above
Similar to 61, the crossbar 121 holds the movable contacts 111 of each pole at the same time, and when any one of the movable contacts 111 operates, the remaining movable contacts 111 interlock. The crossbar 121 is formed of an insulating material such as a synthetic resin molded product, and has contact holders 122 at three locations in the axial direction. The contact holder 122 is a crossbar
The holding body 122b has a shape in which the outer shape of the base body 122a is substantially triangular when viewed from the axial direction of the holding body 121a.
The tip of 2b is separated in the axial direction of the crossbar 121. The base body 122a is formed in a shape in which the protruding surface of the holding body 122b and the surface on the opposite side are open. Base body
The side surface of the lower wall of 122a on the holding body 122b side forms a first spring receiving surface 123 which is a plane in the vertical direction, and the first spring receiving surface 1
A second spring receiving surface 124 is formed at the upper end of the upper surface 23 and is inclined upward and away from the holder 122b. That is, the surfaces of the first spring bearing surface 123 and the second spring bearing surface 124 are
The edges 125 are formed by intersecting at an angle exceeding 180 degrees. A spring receiving projection 126 is provided on the lower wall of the base body 122a so as to extend diagonally upward so as to straddle this edge 125, and the projecting direction of the spring receiving projection 126 is the second spring receiving surface 124.
Is set in a direction substantially orthogonal to. In the base body 122a, the vertical width of the opening on the side opposite to the holding body 122b is the movable contact 11
It is set larger than the vertical width of 1. On the inner peripheral surface of the holding body 122b, a holding groove 128 that is open to the inside of the holding body 122b and the base body 122a side is formed, and the upper peripheral wall of the holding groove 128 is a lower peripheral wall as it approaches the base body 122a. Sloped away from. Further, in the holding groove 128, the tip portion farthest from the base body 122a has a substantially constant width. Holder 12
The tip of 2b is provided with a retaining protrusion 129 protruding inwardly, and a second portion is provided between the tip of the holding groove 128 and the retaining protrusion 129.
The width of the peripheral portion of the connecting groove 95 in the link 94 is set to be substantially equal. By the way, the movable contact 111 has a shaft pin 114 inserted through a substantially central portion in the longitudinal direction, and a spring receiving tongue piece 115 protruding toward the base body 122a side at a lower portion of the end portion on the base body 122a side.
And the spring receiving pin 116 is inserted into the spring receiving tongue 115. The compression spring 113 is sandwiched between the spring receiving projection 126 of the base 122a and the spring receiving tongue 115 of the movable contact 111, and the end on the movable contact 111 side contacts the spring receiving pin 116. Contact. The spring receiving protrusion is provided on the compression spring 113.
Since 126 is inserted, as shown in FIG. 10, the compression spring 1
13 is swingable between a position where its axial direction is orthogonal to the first spring receiving surface 123 and a position orthogonal to the second spring receiving surface 124, and an edge 125 is formed between the spring receiving surfaces 123 and 124. By being formed, the compression spring 113 is reliably positioned at either one of the above two positions. The shaft pin 114 is inserted into the holding groove 128,
The spring force of the compression spring 113 biases the movable contact 111 so that the shaft pin 114 moves toward the tip of the holding groove 128. The second link 94 is rotatably locked to the shaft pin 114, and the second link 94 is sandwiched between the retaining projection 129 and the shaft pin 114 by the spring force of the compression spring 113. Therefore, when connecting the trip device 40 and the contact device 110, the contact device 110 is assembled as shown in FIG. 9 (a), and then the compression spring 113 is pushed as shown in FIG. 9 (b). If the shaft pin 114 is retracted from the tip of the holding groove 128 by retracting it and the shaft pin 114 is mounted in the connecting groove 95 of the second link 94 of the trip device 40 in that state, the compression force to the compression spring 113 is removed. As shown in FIG. 9 (c), the second link 94 has a retaining protrusion.
It is sandwiched between 129 and the shaft pin 114 to prevent it from coming off in the direction orthogonal to the shaft pin 114. Also, the shaft pin 114
In the direction along the direction, the movable contactor 111 and the holding body 122b are sandwiched between the movable contactors 111 and the holding body 122b to prevent the movable contactor 111 from coming off. That is, since the trip device 40 and the contact device 110 are separately assembled, the assembly work is facilitated and the productivity is improved. A locking surface 8 is formed on the bottom surface of the base 1a so as to correspond to the base body 122a. When the crossbar 121 is rotated by a predetermined angle as the contacts are opened, the lower surface of the base body 122a is locked by the locking surface 8. To regulate the rotation angle.

The fixed contact 131, which forms a contact together with the movable contact 112, is provided on the upper surface of the fixed contact plate 132 of the arc extinguishing device 130, and an arc traveling plate 133 is provided at one end of the fixed contact plate 132. One end of an arc drive coil 134 is connected to an end of the fixed contact plate 132 opposite to the arc traveling plate 133 with the fixed contact 131 interposed therebetween. The arc drive coil 134 is bent in a substantially U-shape that is open downward, and is arranged so that the fixed contact 131 is located at a position corresponding to between the two leg pieces. The other end of the arc driving coil 134 is connected to the fixed plate 135.
The fixing plate 135 is bent in a stepwise manner, and the lower side thereof is a fixing piece 135a, and the fixing screw 7 inserted from the lower surface of the base 1a is screwed into the fixing piece 135a, so that the fixing plate 135a.
Is fixed to the base 1a. The upper side of the fixing plate 135 becomes the terminal piece 135b exposed on the outer surface of the housing 1, and the terminal piece 13b
A terminal screw 136 is screwed into 5b. An arc extinguisher 137 is provided above the arc traveling plate 133. The arc extinguisher 137 is formed by a plurality of grid plates 138 that are conductive plates and are arranged in parallel in the vertical direction with a small gap therebetween, and a holding frame 139 formed of an insulating material that holds the grid plates 138. Then, the lowermost grid plate 138 is arranged so as to face the arc traveling plate 133.

As described above, the terminal strip 18, the coil 11, the heater plate 3
1, connection wire 37, movable contact 111, movable contact 112, fixed contact 1
A main electrical path passing through the fixed contact plate 132, the arc driving coil 134, and the fixed plate 135 is formed. Further, by having the above-described configuration, in assembling each device in the housing 1, first, after incorporating the trip device 10, the contact device 110, and the arc extinguishing device 130 that form the main electric path,
In this case, the trip device 40 may be incorporated. In this case, the second link 94 of the trip device 40 and the shaft pin 114 of the contact device 110 are used.
What is necessary is to connect with.

(Operation) The operation will be described below. First, as shown in FIG. 14, when the handle 100 is tilted to the trip device 10 side (right side in FIG. 14), the movable contact 112 and the fixed contact 131 are separated. In this state, the latch piece 55 of the latch link 51 is inserted into the holding groove 62 of the interlocking bar 61, and the latch link 51 is biased counterclockwise around the link pin 52 by the compression spring 54. The lower surface of the pressing piece 56 of the latch link 51 is in contact with the upper edge of the locking lever 71,
71 is urged clockwise by a compression spring 74 around the link pin 72. Here, the latch link 51 and the locking lever 71
Due to the contact between the two, the rotation of both is stopped. In the notch hole 75 of the locking lever 71, the locking projection of the cradle 81
82 is inserted, and rotation of the cradle 81 is stopped.
On the other hand, the straight line connecting both ends of the tension spring 102 passes on the right side of the shaft protrusion 84, and the upward spring force acts on the link pin 93 that connects the first link 91 and the second link 94. 91 is biased counterclockwise around the shaft projection 84. Therefore, the second link 94 is pulled up to the upper right together with the movable contact 111 connected to the second link 94, and the movable contact 1
Since the 12 and the fixed contact 131 are separated, the crossbar 121 is biased clockwise. Crossbar 1 on base 1a
Since the locking surface 8 corresponding to the base body 122a of 21 is formed, the rotation angle of the crossbar 121 is restricted by the contact of the base body 122a with the locking surface 8. Here, since the straight line connecting both ends of the compression spring 113 passes through the right side of the shaft pin 114 and the spring force of the compression spring 113 acts upward, the movable contact 111 is biased counterclockwise. That is, the movable contact 1
11 is in a state of contacting the lower surface of the upper wall of the base body 122a.

Next, as shown in FIG. 1, the handle 100 is attached to the arc extinguishing device 1
When tilted to the 30 side (left side in the figure), the straight line connecting both ends of the tension spring 102 passes the left side of the shaft protrusion 44 and the spring force acts downward, so that the handle link 101 is biased counterclockwise. The state where the handle 100 is tilted to the left side is maintained.
Here, the handle link 101 is in contact with the stopper protrusion 45, whereby the maximum rotation angle is restricted. Also,
In this state, the straight line connecting both ends of the tension spring 102 passes on the right side of the link pin 83 that supports the cradle 81, and the spring force acts upward, so that the cradle 81 is urged counterclockwise. . Here cradle 81, locking lever
The 71, the latch link 51, and the interlocking bar 61 are maintained in the same state as the above-described contact opening state. On the other hand, the first link 91 and the second link 91
Since the link pin 93 connecting the link 94 is pulled to the left by the spring force of the tension spring 102, the first link 91
And the second link 94 are substantially aligned on a straight line.
The movable contact 111 connected to the lower end of the link 94 is pressed downward to close the movable contact 112 and the fixed contact 131. Further, since a straight line connecting both ends of the compression spring 1113 passes through the right side of the shaft pin 114 and the spring force acts upward, a sufficient contact pressure can be obtained. In this way, when the handle 100 is tilted to the left, it is in a set state in which the spring force of the tension spring 102 is accumulated.

When an extremely large current such as a short-circuit current flows in the main circuit with the contacts closed as described above,
As shown in FIG. 11, the movable contact 112 and the fixed contact 131 are momentarily separated by the electromagnetic repulsive force. At this time, the compression spring 113
Is passed under the shaft pin 114, and the spring force acts to the left, so that the movable contact 112 is urged away from the fixed contact 131 by the spring force of the compression spring 113. . The compression spring 113 is in this position the first
The first spring bearing surface 123 contacts the spring bearing surface 123.
Since the edge 125 is formed between the second spring receiving surface 124 and the second spring receiving surface 124, the reversing operation of the compression spring 113 is easily performed. Further, the compression spring 113 has a first spring receiving surface 123.
, The action direction of the spring force is set accurately. As described above, the compression spring 113 acts as a reversing spring so as to apply the contact pressure when the contacts are closed and accelerate the opening of the contacts when the contacts are opened. Here, an arc is generated with the opening of the contact, but the arc is strongly applied to the arc extinguisher 137 due to the Lorentz force acting between the magnetic field generated around the arc driving coil 134 and the arc. And the arc length is rapidly extended.

Following the opening of the contact by the electromagnetic repulsion, the trip device 40 is driven by the electromagnetic trip device 10a. The electromagnetic tripping device 10a operates when not only a short-circuit current but a large current of several times or more of the rated current flows. That is, when a large current passes through the coil 11 of the electromagnetic trip device 10a, the plunger 13 is pulled downward against the spring force of the return spring 14, and a hook piece 24 formed at the upper end of the plunger 13 is formed.
As a result, the hooking piece 64 of the interlocking bar 61 is pulled downward. As a result, the interlocking bar 61 rotates counterclockwise as shown in FIG. 12, and the latch piece 55 of the latch link 51 is
Is pressed downward. That is, since the latch link 51 rotates right by the spring force of the compression spring 54 and the pressing force to the locking lever 71 is released, the locking lever 71 rotates right by the spring force of the compression spring 74 and the cradle 81 moves. The locking projection 82 is the locking lever 71
From the notch hole 75. Cradle 81, as described above,
Since it is biased counterclockwise by the spring force of the tension spring 102, when the engagement with the locking lever 71 is released, it rotates counterclockwise and pulls up the first link 91 to the upper left. When the first link 91 is pulled up, the second link 94 is pulled up to the upper right along with the contraction of the tension spring 102, and the movable contact 112
The movable contact 111 is pulled up so as to separate from the fixed contact 131. These operations are instantaneous,
The so-called trip operation is performed. When the movable contact 112 separates from the fixed contact 131 in this way, the arc length is extended, the arc is divided by the grid plate 138 of the arc extinguisher 137, and the arc is rapidly extinguished. Further, the high-pressure arc gas that accompanies the arc generation is discharged to the outside of the housing 1 through the exhaust plate 9. Here, the rotation of the crossbar 121 is stopped by the lower end of the base body 122a of the crossbar 121 abutting on the locking surface 8 formed on the bottom surface of the base 1a as described above. Thus, the movable contact 11
1 is restricted by bringing the crossbar 121 into contact with the locking surface 8 of the base 1a.
Is held on the crossbar 121 by the shaft pin 114 and the compression spring 113, so that the impact force when the crossbar 121 abuts on the locking surface 8 is reduced, and the impact on the movable contact 111 and the trip device 40 is reduced. When the trip device 40 operates and the contacts are separated, the impact on the movable contact 111 and the trip device 40 can be reduced while regulating the rotation angle of the movable contact 111. is there. At the contact opening position, the compression spring 113 contacts the second spring receiving surface 124, and a straight line connecting both ends of the compression spring 113 passes through the right side of the shaft pin 114,
The movable contact 111 is set to be counterclockwise urged by the spring force acting upward.

As described above, when a large current of several times the rated value or more passes, the electromagnetic trip device 10a operates and the trip device 40 is driven, but an overcurrent of a slightly larger value than the rated value is applied for a long time. When heated, the heater plate 31 heats the bimetal plate 32 to bend the bimetal plate 32, and the pressing screw 33 presses the pressing piece 63 of the interlocking bar 61 to rotate the interlocking bar 61 counterclockwise. The contact can be opened by operating the trip device 40 in the same manner as described above.

In this way, when the trip device 40 operates, the cradle
Since 81 is disengaged from the locking lever 71, it is necessary to reset the contact in order to close the contact again. The reset is performed by tilting the handle 100 to the right as far as possible, as shown in FIG. That is, when the handle 100 is tilted to the right as much as possible, the pressing pin 86 provided on the handle link 101 presses the pressing protrusion 86 of the cradle 81 rightward, and the cradle 81 rotates clockwise. By this operation, the locking projection piece 82 of the cradle 81 is inserted into the cutout hole 75 along the inclined piece 76 extending to the lower edge of the cutout hole 75 of the locking lever 71, and is engaged by the pressing force from the cradle 81. The stop lever 71 rotates counterclockwise. Therefore, the upper end of the locking lever 71 comes into contact with the lower surface of the pressing piece 56 of the latch link 51, and if the force for tilting the handle 100 to the right is removed here,
The state returns to the state shown in FIG.

[Advantages of the Invention] As described above, according to the present invention, the contact device is rotatably held at a fixed position of the housing and the movable contact having the movable contact, and rotatably holds the movable contact. A crossbar having a contactor holding portion, and a coil-shaped compression spring that is sandwiched between the contactor holding portion and the movable contactor and that exerts a spring force in a plane orthogonal to the axial direction of the crossbar. The spring receiving protrusion protruding from the contact holder is inserted into one end of the compression spring, and the other end of the compression spring is provided with a movable contact with respect to the center of rotation of the movable contact. A spring receiving tongue protruding from the end opposite to the contact part is inserted, and the surface intersects with the edge at an angle exceeding 180 degrees and the compression spring is rotated with the rotation of the movable contact with respect to the contact holder. Straddling the first spring receiving surface and the second spring receiving surface with which one end surface of the A spring receiving protrusion is provided in a protruding shape, and the other end surface of the compression spring makes elastic contact with the spring receiving pin inserted in the spring receiving tongue of the movable contact, so that the contact device is configured as a reversing spring for reversing the movable contact. Assembling work is facilitated by using a compression spring that is relatively simple, and the reversing operation is ensured by the compression spring being sandwiched between the edge and the bearing pin when the direction of action of the spring force reverses. It has the advantage that it is carried out.

[Brief description of drawings]

FIG. 1 is a sectional view showing a set state of an embodiment of the present invention,
2 is an exploded perspective view of the trip device and contact device used in the same as above, FIG. 3 is a perspective view of the trip device and contact device used in the same as above, and FIG. 4 is a perspective view of the trip device used in the same as above. 5 and 5 are exploded perspective views of a tripping device used in the same as above, FIG. 6 is a perspective view of a lower surface side of a bush used in the same as above, and FIG. 7 is a developed view of coils used in the above, and FIG. (A) and (b) are perspective views showing the connecting order of the cradle and the first link used in the same as above, and FIGS. 9 (a), (b) and (c) are the connection between the trip device and the contact device used in the same as above. 10 is a perspective view showing the order, FIGS. 10 (a) and 10 (b) are operation explanatory views of the compression spring of the contact device used in the same as above, and FIG. 11 is a sectional view showing a state in which a short-circuit current is applied in the same as above. The figure shows a cross-sectional view showing a state in which the trip operation is performed in the same as above.
FIG. 14 is a sectional view showing the reset state in the same as above, and FIG. 14 is a sectional view showing the off state in the above. 1 is a housing, 10 is a tripping device, 40 is a trip device, 41 is a holding frame, 110 is a contact device, 111 is a movable contactor, 112 is a movable contact, 113 is a compression spring, 114 is a shaft pin, 121
Is a crossbar, and 122 is a contactor holder.

Claims (1)

[Scope of utility model registration request] 1. A tripping device that is driven when an excessive current passes, and a tripping device that is driven in a set state in which a spring force accumulated by mounting a plurality of links and springs on a holding frame is set. A trip device that performs trip operation and a contact device that is mechanically connected to the trip device and that opens and closes the contact inserted in the main circuit along with the trip operation of the trip device are installed in a fixed position in the housing. In the circuit breaker for wiring, the contact device includes a movable contactor having a movable contact, and a contactor holding portion that is rotatably held in a fixed position of the housing and rotatably holds the movable contactor. And a coil-shaped compression spring that is sandwiched between the contact holder and the movable contact and that exerts a spring force in a plane orthogonal to the axial direction of the crossbar. One end of A spring receiving projection protruding from the contact holding portion is inserted into the end of the compression spring, and the other end of the compression spring is located at the end opposite to the end where the movable contact is provided with respect to the center of rotation of the movable contact. A first spring into which a protruding spring receiving tongue is inserted, the surface intersects with an edge at an angle exceeding 180 degrees, and one end surface of the compression spring abuts as the movable contact rotates with respect to the contact holding portion. A spring receiving projection is provided so as to straddle the receiving surface and the second spring receiving surface, and the other end surface of the compression spring is elastically contacted with a spring receiving pin inserted through the spring receiving tongue of the movable contactor. vessel.