JPH0743993B2 - Circuit breaker for wiring - Google Patents

Description

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 configured to perform trip operation when the trip device is driven in a set state in which spring force is accumulated, and a contact mechanically connected to the trip device and 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, when a large current such as a short-circuit current is applied, the contact is opened by electromagnetic repulsion force. There is provided a reversing spring in order to secure contact pressure at the time of closing and to actuate an auxiliary force of electromagnetic repulsion force at the time of contact opening to surely open the contact. However, since the reversing spring is incorporated, the assembly work is troublesome,
There is a problem of low productivity.

[Object of the Invention] The present invention has been made in view of the above points, and its main object is to facilitate the assembling work of the reversing spring and facilitate the assembling work. By also using the spring force to hold the shaft pin of the movable contact,
An object of the present invention is to provide a circuit breaker for wiring, which simplifies the assembly work of the contact device and improves productivity.

DISCLOSURE OF THE INVENTION In the present invention, a tripping device that is driven when an excessive current flows, 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 are disclosed. Device that performs a trip operation when driven, and a contact device that is connected to one end side of the link of the trip device via a shaft pin and that opens the contact inserted in the main circuit along with the trip operation of the trip device In a wiring breaker installed in a fixed position in the housing, a movable contactor having a movable contact, and a movable contactor rotatably held in the fixed position of the housing and A crossbar provided with a contactor holding part that holds the movable pin about the axis pin, and a contact point with the crossbar that is sandwiched between the contactor holding part and the movable contactor and the movable contactor. Contact point A contact device is composed of a straight line connecting the axis and a compression spring that changes the position of the shaft pin by the rotation of the movable contact with respect to the crossbar, and the contact holding portion of the crossbar is orthogonal to the rotation axis direction of the crossbar. The movable contact has a holding groove that extends in the direction in which the spring force acts on the compression spring and is open on one end side close to the compression spring and closed on the other end away from the compression spring. It is characterized in that the shaft pin that is inserted into is held in pressure contact with the closed end of the holding groove by the spring force of the compression spring.

(Example) In the following examples, a three-pole type breaker is shown. As shown in FIG. 1, basically, a trip device 10 that is 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 trips. The contact device 110 that is momentarily opened when the contact device is opened and the arc extinguishing device 130 that extinguishes the arc generated when the contact device 110 is opened are housed in the housing 1. From there, a handle 100 interlocked with the trip device 40 projects so as to be able to rise and fall. 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 be shared by the three poles. The housing 1 has a base 1a and a base 1a.
It is composed of a cover 1b fitted over the
The handle 100 projects to the outside of the housing 1 through the handle insertion hole 2 formed in the central portion of 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, as shown in FIGS. 4 and 5,
It is composed of an electromagnetic trip device 10a and a thermal trip device 10b. The electromagnetic trip device 10a includes a coil 11 and a yoke 1.
2, Plunger 13, return spring 14, and bush 15. The coil 11 is formed by bending a rectangular sheet metal 17 having a substantially L-shaped notch groove 16 as shown in FIG. 7, and the notch groove 16 is formed in the longitudinal direction of the sheet metal 17. A lateral groove 16a running from one end to the center and a vertical groove 16b having one end open at the side edge of the sheet metal 17 in the longitudinal direction are formed in a continuous shape. This sheet metal 17 is approximately L through a fold line (one-dot chain line in FIG. 7) along one side edge of the lateral groove 16a.
In addition to bending in a letter shape, the sheet metal 17 is bent in a stepwise manner so that the right end of the sheet metal 17 is above the left end through a pair of fold lines running in the longitudinal direction in the longitudinal center of the sheet metal 17. By doing so, the half-turn coil 11 in which the terminal piece 18 is integrally extended is formed at the right end portion. Coil here 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 piece 18
A terminal screw hole 19 is formed in the center of the coil, and a screw hole 20 is formed in the end of the terminal piece 18 on the coil 11 side. Also coil
A projecting piece 21 is provided at the tip of the vertical piece 11b of 11. 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.
11 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, vertical strips 12d and 12e are provided between the horizontal strips 12a to 12c in the upper and lower three stages which are vertically spaced apart and arranged in parallel.
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 11 of the coil 11.
The coil 11 and the yoke 12 are arranged so as to face each other via a so that they are not in contact with each other. The bush 15 is attached to the through hole 22b formed in the second horizontal piece 12b. Bush 1
Reference numeral 5 denotes a rectangular parallelepiped hole having a slightly depressed upper surface and made of a non-magnetic material such as a synthetic resin molded product.
The opening 27 is opened, and as shown in FIG. 6, an insertion projection 28 is provided on the entire circumference of the lower surface of the opening edge of the through hole 27. However, the bush 15 is fixed to the yoke 12 by press-fitting the insertion projection 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 its upper end portion is bent into a substantially L shape so that a hooking piece is formed.
24 is formed, and a spring accommodating recess 25 that is opened to the side is formed at the lower end. The top and bottom width of the spring storage recess 25 is the yoke 12
The width between the first 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 has a rectangular cross section corresponding to the through hole 22a formed in the first lateral piece 12a of the yoke 12 and the through hole 27 of the bush 15.
It is inserted into both through holes 22a and 27 so as to be vertically movable. 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. When the return spring 14 is mounted laterally in the spring accommodating 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 when the plunger 13 moves up and down.
14 is compressed, and the plunger 13 is given a restoring force. Bush 15 and plunger in yoke 12 like this
Since the return spring 14 is attached last with the 13 and 13 attached, the return spring 14 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 lateral 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,
Even if the bush 15 is not crimped and fixed to the yoke 12, the bush 15 can be prevented from coming off. The lower end portion of the plunger 13 is arranged between the vertical piece 11b of the coil 11 and the first vertical piece 12d of the yoke 12, and is configured so that the plunger 13 is attracted downward by energizing the coil 11.
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 trip device 10b includes a heater plate 31, a bimetal plate 3
2 and a pressing screw 33. Each of the heater plate 31 and the bimetal plate 32 has insertion holes 34 and 35 at the lower end portion into which the projecting piece 21 is inserted, and the bimetal plate 32 is laminated on the heater plate 31 and the bimetal plate 32 as the electromagnetic tripping device 10a side. By inserting the protruding piece 21 into the insertion holes 34 and 35 and caulking the protruding piece 21, the heater plate 31 and the bimetal plate 32 are coiled.
It is designed to be fixed to 11 in one. In the state where the heater plate 31 and the bimetal plate 32 are stacked, the upper end portion of the bimetal plate 32 protrudes above the upper end of the heater plate 31, and the pressing screw 33 is inserted into the screw hole 36 formed in this protruding portion.
Is screwed in and out freely. 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.

As shown in FIG. 1, the trip device 10 configured as described above is arranged so that the terminal piece 18 is exposed to the outside of the housing 1, and is fixed by a fixing screw 3 screwed from the lower surface of the base 1a. The front end portions of 4 and 4 are screwed into the screw holes 20 formed in the terminal piece 18 and the screw holes 23 formed in the yoke 12, whereby the housing 1 is fixed at a fixed position. A terminal screw 29 is screwed into the terminal screw hole 19 of the terminal piece 18. This tripping device 10 is provided for each pole,
They are designed to work 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 the lower end portion of each support plate 41a. Are each 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. Tripping device in holding frame 41
A latch link 51 is pivotally supported by a link pin 52 at the end on the 10 side so as to be swingable.

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 is extended at an end of the latch link 51 close to the tripping device 10, and the latch piece 55 is inserted into a holding groove 62 formed in the interlocking bar 61. A holding piece 56 extends from the end of the latch link 51 farther from the tripping device 10 than the shaft supporting portion, and the upper end of the locking lever 71 abuts on the lower surface of the holding piece 56.

The interlocking bar 61 is spaced apart from the three axial positions at substantially equal intervals so that the pressing piece 63 and the hooking piece 64 project in a direction substantially orthogonal to each other, and the pressing piece 63 is substantially orthogonal to the central portion in the axial direction. A locking piece 65 is formed so as to project in the direction in which the locking bar 65 extends, and both axial ends of the interlocking bar 61 are rotatably supported at fixed positions on the inner surface of the housing 1. The pressing piece 63 is arranged corresponding to the tip of the pressing screw 33 of the 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 interlocking bar 61 rotates counterclockwise in FIG. Here, the pressing pieces 63 are attached to the 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. A holding groove 62 whose side surface and tip end surface are open is formed in the locking piece 65, and the holding groove is formed at the tip end of the locking piece 65.
The upper wall of 62 forms an inclined surface 66 that gently rises and inclines toward the tip of the locking piece 65.

A lower end portion of the locking lever 71 is pivotally attached to the holding frame 41 by a link pin 72, and a spring receiving projection 73 is provided above the axial attachment portion in a direction away from the trip device 10. Has been done. The spring receiving protrusion 73 is provided on the holding frame 41.
A compression spring (74) is sandwiched between the spring receiving projection (43) protruding in the direction of approaching the trip device (10) at the upper end of the compression spring (74). Further, a cutout hole 75 is formed in the locking lever 71, and a sloped piece 76 that is inclined upward in a direction away from the tripping device 10 is extended from the lower edge of the cutout hole 75. Notch hole of locking lever 71
A locking projection 82 extending from the cradle 81 is inserted into the 75.

The cradle 81 is bent into a substantially U shape with leg pieces substantially parallel to both supporting plates 41a of the holding frame 41, and the link pin 83
Thus, the lower end is pivotally attached to the holding frame 41 so as to be swingable. 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 attached to the shaft projection 84. In the first link 91, the distance between the outer peripheral surfaces of both legs is the cradle.
The bearing groove 92 is formed in a substantially U-shape that is set to be substantially equal to the distance between the inner peripheral surfaces of both leg pieces of 81, and the upper end portion of both leg pieces has a bearing groove 92 notched in a superior arc shape with a diameter substantially equal to that of the shaft protrusion 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 set to be 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 and smaller than the diameter W ₃ of the shaft protrusion 84. However, as shown in FIG. 8 (a), the bearing groove 92 of the first link 91 is inserted into the shaft protrusion 84 from the direction parallel to the plane 85 of the shaft protrusion 84 in the plane orthogonal to the axial direction of the shaft protrusion 84. Then, as shown in FIG. 8B, if the first link 91 is rotated around the axis of the shaft protrusion 84,
The first link 91 is swingably held by the cradle 81 so as not to come off. Here, the position of the plane 85 on the shaft protrusion 84 is provided at a position where the first link 91 does not drop from the cradle 81 in the operating 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. A pressing protrusion 86 is provided at an end of each leg of the cradle 81 opposite to the locking protrusion 82.

As shown in FIG. 3, the lower end of the first link 91 is rotatably connected to the upper end of the second link 94 by a link pin 93. One end of the tension spring 102 is coupled to the link pin 93. The other end of the tension spring 102 is connected to the hook hole 103 at the upper end of the handle link 101. The handle link 101 is formed in a substantially U-shape that is open downward, and an upper end portion thereof is integrally coupled to the handle 100 and swings when the handle 100 is tilted. 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. 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 support plate 41a. In addition, the holding frame 4 in the handle link 101
A pressing pin 105 is attached to a portion projecting above 1. An arcuate surface 106 is formed on the upper surface of the lower end portion of the handle 100 along the arcuate surface 6 formed on the inner peripheral surface around the handle insertion hole 2 at the upper end portion of the housing 1.
Both 06 are arcs centered on the shaft protrusion 44. 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 110.
Connected to.

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 11 interposed between the crossbar 121 and the movable contact 111.
3 and fixed contacts integrally provided on the arc extinguishing device 130 described later.
It has 131 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 axially supported at a fixed position on the inner peripheral surface of the housing 1, and simultaneously drives the movable contacts 111 of the other poles. That is, the above-mentioned interlocking bar
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 holding portions 122 at three axial positions. 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 tips of 2b are separated from each other 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
A side surface of the lower wall of 122a on the side of the holding body 122b forms a first spring receiving surface 123 which is a plane in the vertical direction.
A second spring receiving surface 124 is formed at the upper end of 23 so as to rise upward and incline in a direction away from the holding body 122b. That is, the edge 125 is formed between the first spring receiving surface 123 and the second spring receiving surface 124. A spring receiving protrusion 126 is provided on the lower wall of the base body 122a and extends obliquely upward so as to straddle the edge 125, and the protruding direction of the spring receiving protrusion 126 is substantially orthogonal to the second spring receiving surface 124. Is set to the direction. The vertical width of the opening of the base 122a on the side opposite to the holding body 122b is set to be larger than the vertical width of the movable contact 111. 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. Also, the holding groove 128
In, the tip end farthest from the base body 122a has a substantially constant width. A retaining projection 129 is provided so as to project inward at the tip of the holding body 122b, and the space between the tip of the retaining groove 128 and the retaining projection 129 is the width of the peripheral portion of the connecting groove 95 in the second link 94. The settings are almost equal. By the way, the movable contactor 111 has a shaft pin 114 inserted through a substantially central portion in the longitudinal direction, and a spring receiving tongue 115 protruding toward the base body 122a side is formed at the lower part of the end portion on the side of the base body 122a and a spring. The spring receiving pin 116 is inserted into the receiving tongue 115. Compression spring 11
3 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. Since the spring receiving protrusion 126 is inserted into the compression spring 113, the axial direction of the compression spring 113 is orthogonal to the first spring receiving surface 123 and the second spring receiving surface 124 as shown in FIG. It is possible to swing between the two spring receiving surfaces 123,
Since the edge 125 is formed between 124, 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, and the spring force of the compression spring 113 causes the movable pin 111 to move toward the tip of the holding groove 128.
Is activated. The second link 94 is rotatably locked to the shaft pin 114, and the second link 94 is sandwiched between the retaining protrusion 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, after the contact device 110 is assembled as shown in FIG. 9 (a), as shown in FIG. 9 (b), the compression spring 11
3 is retracted to retract the shaft pin 114 from the tip of the holding groove 128, and in that state, the connecting groove of the second link 94 of the trip device 40.
After attaching the shaft pin 114 to the 95, if the compressive force to the compression spring 113 is removed, as shown in FIG.
It is sandwiched between the retaining projection 129 and the shaft pin 114 to prevent retaining in the direction orthogonal to the shaft pin 114. Further, in the direction along the shaft pin 114, it is prevented from coming off by being sandwiched between the movable contact 111 and the holding body 122b. 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 rotates by a predetermined angle as the contacts open,
The lower surface of the base body 122a contacts the locking surface 8 to regulate the rotation angle.

A fixed contact 131, which constitutes a contact with the movable contact 112, is provided on the upper surface of a fixed contact plate 132 of the arc extinguishing device 130, and an arc running 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 drive coil 134 is connected to the fixed plate 135. The fixing plate 135 is bent in a staircase shape, and the lower side of the fixing plate 135 is the fixing piece 1.
The fixing plate 135 is fixed to the base 1a by screwing the fixing screw 7 inserted into the lower surface of the base 1a into the fixing piece 135a. The upper side of the fixed plate 135 becomes a terminal piece 135b exposed on the outer surface of the housing 1, and a terminal screw 136 is screwed into the terminal piece 135b. An arc extinguisher 137 is arranged 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. And the bottom grid plate 138
Are arranged so as to face the arc traveling plate 133.

As described above, the terminal piece 18, the coil 11, the heater plate 31,
Connection line 37, movable contact 111, movable contact 112, fixed contact 13
1, the main electric path passing through the fixed contact plate 132, the arc drive 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,
It is only necessary to incorporate the trip device 40, and at that time, the second link 94 of the trip device 40 and the shaft pin 114 of the contact device 110.
You can connect and.

(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
The contact between and prevents the rotation of both. In the notch hole 75 of the locking lever 71, the locking projection of the cradle 81
82 is inserted and the cradle 81 is stopped from rotating.
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 130.
When tilted to the 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 100 is pushed down 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 pivotally supporting the cradle 81, and the spring force acts upward, so that the cradle 81 is biased counterclockwise. . Where cradle 81, locking lever
71, the latch link 51, and the interlocking bar 61 are kept in the same state as the above-mentioned contact opening state. On the other hand, the first link 91 and the second
Since the link pin 93 connecting the link 94 is pulled to the left side by the spring force of the tension spring 102, the first link 91
The second link 94 and the second link 94 are arranged in a substantially 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 113 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.

If an extremely large current such as a short-circuit current flows in the main circuit with the contacts closed as described above, the 11th
As shown in the figure, the movable contact 112 and the fixed contact 131 are momentarily separated by the electromagnetic repulsive force. At this time, since the straight line connecting both ends of the compression spring 113 passes under the shaft pin 114 and the spring force acts leftward, the movable contact 112 is attached in a direction away from the fixed contact 131 by the spring force of the compression spring 113. Will be encouraged. The compression spring 113 abuts the first spring receiving surface 123 at this position, and the edge 125 is formed between the first spring receiving surface 123 and the second spring receiving surface 124, so that the compression spring 113 is formed. The inversion operation of is easily performed. Further, since the compression spring 113 contacts the first spring receiving surface 123, the acting direction of the spring force is accurately set. 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 due to the Lorentz force acting between the magnetic field generated around the arc driving coil 134 and the arc, the arc is strongly applied toward the arc extinguisher 137. Energized, the arc length is lengthened rapidly.

Following the opening of the contacts due to the electromagnetic repulsive force, 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 tripping device 10a, the plunger 13 is pulled downward against the spring force of the return spring 14, and the hooking piece 24 formed on the upper end of the plunger 13 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,
The latch piece 55 of the latch link 51 is pressed downward by the inclined surface 66 of the holding groove 62. 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 left by the spring force of the compression spring 74, and the cradle 81 The locking projection 82 is disengaged from the cutout hole 75 of the locking lever 71. Since the cradle 81 is biased counterclockwise by the spring force of the tension spring 102 as described above,
When the engagement with the locking lever 71 is released, it rotates counterclockwise,
The first link 91 is pulled to the upper left. Also, the first link
When 91 is pulled up, the second link 94 is pulled up to the upper right as the tension spring 102 contracts, and the movable contact 111 is pulled up so as to separate the movable contact 112 from the fixed contact 131. These series of operations are instantaneously performed, so-called trip operation is performed. In this manner, when the movable contact 112 separates from the fixed contact 131, 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 accompanying the arc generation passes through the exhaust plate 9 and the housing 1
It is discharged outside. Here, as described above, the crossbar 12
The bottom end of the first base body 122a comes into contact with the locking surface 8 formed on the bottom surface of the base 1a, whereby the rotation of the crossbar 121 is stopped. In this way, the opening angle of the movable contact 111 is regulated by bringing the crossbar 121 into contact with the locking surface 8 of the base 1a, and the movable contact 111 is crossed by the shaft pin 114 and the compression spring 113. Since the cross bar 121 is held by the bar 121, the impact force when the cross bar 121 comes into contact with the locking surface 8 is mitigated, the influence on the movable contact 111 and the trip device 40 is reduced, and the trip device 40 operates. When the contact is opened, the impact on the movable contact 111 and the trip device 40 can be reduced while controlling the rotation angle of the movable contact 111. In the open position of the contact, the compression spring 113 contacts the second spring receiving surface 124, 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 acts upward to move the movable contactor. 111 is set to be biased counterclockwise.

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 81
Is to be disengaged from the locking lever 71, it is necessary to reset in order to close the contact again. The reset is performed by tilting the handle 100 to the right side as much as possible, as shown in FIG. Ie the handle
When 100 is tilted to the right to the maximum, the pressing pin 105 provided on the handle link 101 presses the pressing protrusion 86 of the cradle 81 to the right, and the cradle 81 rotates clockwise. By this operation, the locking projection 82 of the cradle 81 becomes the cutout hole of the locking lever 71.
The locking lever 71 is inserted into the notch hole 75 along the inclined piece 76 extending to the lower edge of 75, and the locking lever 71 rotates counterclockwise by the pressing force from the cradle 81. 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,
If you remove the force to push the handle 100 to the right,
It returns to the state shown in the figure.

[Effects of the Invention] As described above, in the present invention, a compression spring that is easy to assemble is used as the reversing spring that secures the contact pressure when the contacts are closed and biases the contacts when the contacts are opened This compression spring can also be used for holding the shaft pin, and the fact that the compression spring is used means that the shaft pin of the movable contactor is housed in the contactor holding portion of the crossbar. Since the contact device can be easily assembled, the productivity of the contact device is improved and the compression spring has a short retractable distance. The movable contact does not come off from the crossbar.

[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.
The figure 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 same as 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, 122 is a contact holding portion, 128 is a holding groove, 131
Is a fixed contact.

Claims (1)

[Claims] 1. A trip device driven when an excessive current flows, and a trip device driven in a set state in which a plurality of links and springs are mounted on a holding frame and spring force is accumulated. The trip device that performs the trip operation and the contact device that is connected to one end side of the link of the trip device via the shaft pin and that opens and closes the contact inserted in the main circuit along with the trip operation of the trip device are inside the housing. In a circuit breaker installed at a fixed position, a movable contact having a movable contact and a movable contact held at a fixed position of a housing are rotatably held and the movable contact is centered around the shaft pin. A crossbar having a contactor holding portion that holds it rotatably, and a contact point between the contactor holding portion and the movable contactor that are sandwiched between the crossbar and the movable contactor. Connecting straight line and axis pin A contact device is configured with a compression spring that changes the position of the movable contact by rotation of the movable contact with respect to the crossbar, and the contact holding portion of the crossbar has the compression spring in a plane orthogonal to the rotation axis direction of the crossbar. Has a holding groove that extends in the direction of action of the spring force and is open at one end side close to the compression spring and closed at the other end apart from the compression spring, and is inserted into the movable contactor. Is held in pressure contact with the closed end of the holding groove by the spring force of a compression spring.