JP4305059B2 - Circuit breaker movable contact device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a movable contact device for a circuit breaker having a movable contact attached to or detached from a fixed contact.
[0002]
[Prior art]
Conventionally, this type of circuit breaker has a movable contact at one end in the longitudinal direction, and the other end in the longitudinal direction is pivotally supported by a crossbar interlocked with the turning operation of the handle.
One end is twisted approximately 90 degrees from one side in the short direction with respect to the other end so that one end in the longitudinal direction and the other end in the longitudinal direction are at right angles to each other (for example, JP-A-8-69740) is known.
[0003]
[Patent Document 1]
JP-A-8-69740 [0004]
[Problems to be solved by the invention]
In the circuit breaker described above, since the plate-like metal is twisted approximately 90 degrees from one side in the short direction and the other end in the longitudinal direction to form a movable contact, If the fixed contact is biased to one side in the short direction of the plate-like metal and comes into contact with the movable contact, it is likely to be deformed to the original shape before the movable contact is twisted. In the case of deformation, there is a problem that the contact area between the movable contact and the fixed contact becomes small and heat is easily generated.
[0005]
The present invention has been made in view of such a reason, and the object of the present invention is that the fixed contact is biased to one side in the short direction of the plate metal and contacts the movable contact. However, an object of the present invention is to provide a movable contactor device for a circuit breaker that is difficult to be deformed into its original shape and becomes strong.
[0006]
[Means for Solving the Problems]
The movable contactor device for a circuit breaker according to claim 1 is formed of a single plate-like metal, has a movable contact at one longitudinal end thereof, and has a support at the other longitudinal end. A movable contact device comprising: a contact portion in which the movable contact is attached to one side in the thickness direction at one longitudinal end of the plate metal; and the support from the vicinity of the contact portion of the plate metal. A bent portion obtained by bending the other end in the longitudinal direction with a portion in a direction approaching each other from both sides in the short direction, and the bent portion includes a pair of bent pieces that are bent in contact with each other. And the width of the pair of bent pieces in the facing direction is narrower than the width of one end side having the movable contact .
[0007]
According to the movable contact device for a circuit breaker according to claim 1, it is possible to manufacture a movable contact by bending a single plate-shaped metal, facilitating material picking and manufacturing operations. In addition, since a single plate metal is bent in a direction approaching from both sides, even if the fixed contact is biased to one side of the short direction of the plate metal and contacts the movable contact It becomes difficult to be deformed to the original shape, and the movable contact becomes strong.
Since the bent portion has a pair of bent pieces bent in contact with each other, the movable contact can be further strengthened.
[0010]
The movable contactor device for a circuit breaker according to claim 2 is formed of a single plate-like metal, has a movable contact at one end in the longitudinal direction, and has a support at the other end in the longitudinal direction. A movable contact device comprising: a contact portion in which the movable contact is attached to one side in the thickness direction at one longitudinal end of the plate metal; and the support from the vicinity of the contact portion of the plate metal. A pair of bent pieces that are bent in a non-contact state with each other. The width of the pair of bent pieces in the facing direction is narrower than the width of one end side having the movable contact .
[0011]
According to the movable contactor device for a circuit breaker according to claim 2, it is possible to manufacture a movable contactor by bending a single plate-like metal, facilitating material picking and manufacturing operations. In addition, since a single plate metal is bent in a direction approaching from both sides, even if the fixed contact is biased to one side of the short direction of the plate metal and contacts the movable contact It becomes difficult to be deformed to the original shape, and the movable contact becomes strong.
When the support part is pivotally supported by the crossbar, a shaft hole for inserting the shaft into the pair of bent pieces is formed, and the shaft can be inserted even if the shaft hole is slightly shifted by the pair of bent pieces, Therefore, it is possible to easily support the crossbar on the shaft.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
A circuit breaker according to a first embodiment of the present invention will be described with reference to FIGS. That is, this circuit breaker mainly includes a handle link 1, a holding frame 2, a trip link 3, a latch member 4, a first connection link 5, a second connection link 6, a tension spring 7, and a cross in FIGS. It has a bar 8, a stationary contact 9, and a tripping device 10. Reference numeral 11 denotes a container or housing containing these.
[0015]
The handle link 1 holds a handle 12 at one end. The handle 12 protrudes from the upper surface of the housing 11 so as to be rotatable. The handle link 1 is formed in a substantially inverted U-shape having both side pieces 14 so that an engagement piece 13 is projected from both sides of the upper end portion which is one end side, and an arc shape is formed at the lower end of the both side pieces 14 which is the other end side. The recessed bearing groove 15 is formed by a notch. A rib 16 is formed at the center of the upper end, and a plurality of slits 17 are formed on both sides of the rib 16. A groove 18 that fits to the upper end of the handle link 1 is formed on the lower surface of the handle 12, and a lateral groove 19 that engages the engagement piece 13 is formed on both sides of the bottom of the groove 18. The groove 18 of the handle 12 is put on the upper end portion of the handle link 1 and is slid to engage the engaging piece 13 with the lateral groove 19 to hold the handle 12 on the handle link 1.
[0016]
The holding frame 2 rotatably supports the other end side of the handle link 1 in a state where the handle link 1 can be moved in the handle direction. The holding frame 2 includes a pair of side pieces 2b connected by a connecting portion 2a at one end, and is a cylindrical shaft portion that is inserted into the bearing groove 15 of the handle link 1 at a substantially lower center portion of the pair of side pieces 2b. 2c protrudes outward, both side pieces 14 of the handle link 1 cover the outside of the pair of side pieces 2b, the bearing groove 15 is rotatably engaged with the shaft portion 2c, and the handle link 1 swings to the holding frame 2. It is supported freely. The holding frame 2 is provided with mounting holes 2d at its four corners, and is fixed at a fixed position in the housing 11, that is, the mounting base 11a. A crossbar storage space is formed between the bottom of the housing 11 and the lower surface of the holding frame 2.
[0017]
The trip link 3 is pivotally supported by the holding frame 2. The trip link 3 has a substantially horizontal U-shape that enters between the pair of side pieces 2b of the holding frame 2, has holes 3a formed at the lower sides of both ends thereof, and is formed near the connecting portion 2a of the holding frame 2. The shaft 20 is passed through the hole 2e, and the hole 3a of the trip link 3 is fitted to the shaft 20 so that the trip link 3 is pivotally supported. A latch engaging portion 3 b is bent at the center of the U-shape of the trip link 3.
[0018]
The latch member 4 locks the trip link 3. The latch member 4 includes a first member 21 that is close to the trip link 3 and a second member 22 that is farther from the trip link 3 than the first member 21. The first member 21 supports a bearing 21 a of the first member 21 on a pin 23 installed in a hole 2 f near the center of the end portion on the opposite side of the connecting portion 2 a of the holding frame 2. The lower end of the central portion of the first member 21 is locked on the engaging portion 3b of the trip link 3 to be in a latched state. The second member 22 pivotally supports a bearing 22 a on a pin 24 installed in an upper end hole 2 g at the end opposite to the connecting portion 2 a of the holding frame 2. A spring 25 using a torsion coil spring is supported on the pin 23. One end of the spring 25 is engaged with the first member 21, and the other end is engaged with the second member 22. The second member 22 is supported at the return position. Then, the tip of the locking projection 22b provided on the second member 22 is projected toward the first member 21, and the edge of the window hole 21b of the first member 21 contacts the tip of the locking projection 22b. In contact with each other, the second member 22 rotates counterclockwise so that the locking projection 22b can be loosely fitted into the window hole 21b of the first member 21. The detection member 40 is attached to the second member 22 (FIG. 2). In such a configuration, when the second member 22 is pushed counterclockwise, the tip of the locking projection 22b slides on the first member 21, enters the window hole 21b, and the first member 21 rotates clockwise. It is rotated and disengaged from the engaging portion 3b of the trip link 3, and the latch of the trip link 3 is released.
[0019]
One end side of the first connection link 5 is supported by the trip link 3. The first connection link 5 enters the inside of the trip link 3, and the shaft portion 5a of the first connection link 5 is rotatably fitted in a notched bearing hole 3b formed at a position above the hole 3a of the trip link 3. Match.
[0020]
The second connection link 6 is rotatably supported at one end by the other end of the first connection link 5. In the embodiment, the hole 6 a at the upper end is connected to the hole 5 b provided on the lower end side of the first connection link 5 via the pin 26.
[0021]
The tension spring 7 is locked to a support point of the second connection link 6 with the first connection link 7 and one end side of the handle link 1. In the embodiment, two tension coil springs are used, for example, a hook-shaped hook portion at one end is hooked on the pin 26, and the hook-shaped hook portion at the other end is passed through the slit 17 and hooked on the rib 16. ing.
[0022]
The cross bar 8 holds the movable contact 29 to which the movable contact 28 is fixed and is connected to the other end side of the second connection link 6 and is rotatably supported. The crossbar 8 is interlocked with the turning operation of the handle 12 and is rotatably accommodated in a crossbar housing space between the bottom of the housing 11 and the lower end of the holding frame 2. The circumferential portion 8a formed on the cross bar 8 is slidably contacted with the arc recess 2h at the lower end of the holding frame 2, and is placed on the bottom of the housing 11 in the state shown in FIG. It can be rotated counterclockwise around. The movable contact 29 is formed of a single plate-like metal 73 and is rotatably held on the crossbar 8 via a pin 30 serving as a support at the other end opposite to the movable contact 28 at one end in the longitudinal direction. In addition, the movable contact 28 is urged by the spring 31 in the advancing direction. As shown in FIG. 4, the movable contact 29 according to the embodiment includes a contact portion 70 in which the movable contact 28 is attached to one side in the thickness direction at one end in the longitudinal direction of a single plate-like metal 73, and a plate-like metal. 73 is provided with a bent portion 71 that is bent from the vicinity of the contact portion 70 in the longitudinal direction at the other end in the longitudinal direction with the support portion (30) in a direction approaching each other from both sides in the short direction. The bent portion 71 has a pair of bent pieces 72 bent in a state where they are in contact with each other. Here, the direction P1 facing the attachment surface of the movable contact 28 and the bending direction P2 of the bent portion 71 are different directions. Further, the pin 32 of the crossbar 8 is inserted into the hole 8 b provided between the pin 30 of the movable contact 29 and the movable contact 28, and the hole 6 b formed on the pin 32 on the other end side of the second connection link 6. Are linked through.
[0023]
The fixed contact 9 has a fixed contact 33 that contacts and separates from the movable contact 28 fixed thereto. The fixed contact 9 is fixed to the bottom of the housing 11 and is connected to a terminal 34 that is exposed outside one end of the housing 11.
[0024]
The trip device 10 detects an overcurrent, operates the latch member 4 to release the latched state of the trip link 3 and the latch member 4, and forcibly opens the movable contact 28 from the fixed contact 33. In this tripping device 10, an adjustment screw 38 is provided at the tip of a bimetal 37 provided on the heater plate 36 for changing overcurrent into heat, and the tip of the adjustment screw 38 is provided on the detection piece 40 of the second member 22. Oppositely, the second member 22 is pushed by the operation of the bimetal 37. A fixed iron core 41 is provided around the heater plate 36, a movable iron core 44 facing the fixed iron core 41 is provided at the lower end portion of the detection member 43 whose intermediate portion is pivotally supported by the shaft 42, and the upper end portion of the detection member 43 is the detection piece. Opposite to 40, the movable iron core 44 is sucked by the fixed iron core 41 to push the second member 22. The detection member 43 is biased to the return position by the return spring 57. The heater plate 36 is attached to the housing 11 with screws 55, one end of which is connected to a terminal 46 disposed on the outer surface of the other end of the housing 11, and the other end of the heater plate 36 is movable via a flexible electric wire 47. The contact 29 is connected.
[0025]
In the above configuration, in the state where the trip link 3 is latched by the latch member 4, the support point (26) of the second connection link 6 with the first connection link 5 and the tension spring of the handle link 1 by the turning operation of the handle 12. When the line connecting the support points (16) exceeds the support points (5a, 3b) between the trip link 3 and the first connecting link 5, the contact opening / closing state is reversed. When the trip link 3 is detached from the latch member 4 when the contact is closed, the support points (5a, 3b) between the trip link 3 and the first connection link 5 are the first connection of the second connection link 6. The contact point is forcibly opened beyond the line connecting the support point (26) with the link 5 and the tension spring support point (16) of the handle link 1.
[0026]
Further, in a state where the movable contact 28 is welded to the fixed contact 33, the engaging portion 48 that prevents the handle 12 from being turned off by the handle link 1 engaging with the crossbar 8 when the handle 12 is turned in the off direction. , 49.
[0027]
Further, when the handle 12 is further turned off in the engaged state of the engaging portions 48 and 49, the handle link 1 against the holding frame 2 against the tension spring 7 with the engaging portions 48 and 49 serving as fulcrums. It has the movement prevention part 50 which prevents moving. The movement preventing unit 50 is configured by, for example, an arcuate long hole bearing portion 51 formed in the holding frame 2 and a shaft portion 52 protruding from the handle link 1. The notch 51a is for fitting the shaft portion 52, and is formed at a position near the on position between the on position and the off and reset positions.
[0028]
2 and 3 are in the on state. In this state, the trip link 3 is latched by the latch member 4. The handle 12 is kept on by the tension spring 7, and the first connection link 5 and the second connection link 6 are extended by the tension spring 7. For this reason, the crossbar 8 is rotated by the second connection link 6. Thus, the movable contact 28 of the movable contact 29 is brought into contact with the fixed contact 33 of the fixed contact 9, and contact pressure is applied by the spring 31. As a result, the terminals 34 and 46 are turned on and current flows.
[0029]
FIG. 5 shows an off state. In FIG. 2, the handle 12 is turned from the on state to the off direction, and the support point (26) of the second connection link 6 with the first connection link 5 and the tension spring support point (6) of the handle link 1 are set. When the connecting line exceeds the support points (5a, 3b) between the trip link 3 and the first connection link 5, the handle 12 is biased in the off direction, and the first connection link 5 and the second connection are connected by the tension spring 7. The link 6 is bent from the extended state, the cross bar 8 is rotated, and the movable contact 29 is separated from the fixed contact 9. As a result, the terminals 34 and 46 are turned off, and the rotation of the handle link 1 and the rotation of the crossbar 8 occur almost simultaneously in the same direction, so that the engaging portions 48 and 49 do not engage with each other.
[0030]
FIG. 6 shows a trip state. In FIG. 2, when an overcurrent flows between the terminals 34 and 46, the bimetal 37 operates and pushes the detection piece 40 of the second member 22 with the adjusting screw 38. When a short-circuit current flows between the terminals 34 and 46, the movable iron core 44 is attracted to the fixed iron core 41, and the detection member 43 pushes the detection piece 40 of the second member 22 against the return spring 57. As a result, when the second member 22 rotates counterclockwise against the spring 25, the locking protrusion 22 b is fitted into the window hole 21 b of the first member 21, and the first member 21 is moved by the spring 25. The first member 21 is released from the latch engaging portion 3b of the trip link 31 and released, the second connecting link 6 is pulled up by the tension spring 7, and the trip link 3 is rotated counterclockwise. The support points (3b, 5a) between the trip link 3 and the first connection link 5 are the support points (26) of the second connection link 6 with the first connection link 5 and the tension spring support points (16 of the handle link 1). ), The first connecting link 5 and the second connecting link 6 are pulled up from the extended state to the bent state, and thus the movable contact 29 is separated from the fixed contact 9 and at the same time the handle link 1 And handle 12 is It moves to the middle between the position and the off position. The first member 21 is in the state shown in FIG. 2 by the return of the bimetal 37 and the return of the detection member 43 by the spring 57, and at the same time the locking projection 22b is removed from the window hole 21b. Abut. To reset from the trip state, the handle 12 is operated to the reset position beyond the OFF position in the OFF direction, and the trip link 3 is pushed by the handle link 1 to latch the latch engaging portion 3b to the first member 21.
[0031]
A second embodiment of the present invention is shown in FIG. That is, in the first embodiment, the pair of bent pieces 72 of the bent portion 71 are bent in a state of not contacting each other with a gap 74 formed therebetween. 75 and 76 are insertion holes formed in the bent piece 72 and through which the pin 30 of the support portion is inserted. Since there is a gap 74 between the insertion holes 75, 76, the consistency of the insertion holes 75, 76 is relaxed compared to the case where there is no gap 74 as in the first embodiment, and the insertion holes 75, 76. Even if there is a slight deviation, the pin 30 can be easily inserted. Others are the same as in the first embodiment.
[0032]
【The invention's effect】
According to the movable contact device for a circuit breaker according to the first aspect, a movable contact can be manufactured by bending a single plate-like metal, which facilitates material removal and manufacturing work. In addition, since a single plate metal is bent in a direction approaching from both sides, even if the fixed contact is biased to one side of the short direction of the plate metal and contacts the movable contact It becomes difficult to be deformed to the original shape, and the movable contact becomes strong.
Since the bent portion has a pair of bent pieces bent in contact with each other, the movable contact can be further strengthened.
[0034]
According to the movable contact device for a circuit breaker according to claim 2, it is possible to manufacture a movable contact by bending a single plate-shaped metal, facilitating material picking and manufacturing operations. In addition, since a single plate metal is bent in a direction approaching from both sides, even if the fixed contact is biased to one side of the short direction of the plate metal and contacts the movable contact It becomes difficult to be deformed to the original shape, and the movable contact becomes strong.
When the support part is pivotally supported by the crossbar, a shaft hole for inserting the shaft into the pair of bent pieces is formed, and the shaft can be inserted even if the shaft hole is slightly displaced by the pair of bent pieces, Therefore, it is possible to easily support the crossbar on the shaft.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a built-in component of a circuit breaker according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of the ON state.
FIG. 3 is a cross-sectional view showing a relationship between a holding frame in an on state and a handle link.
FIG. 4 is an enlarged perspective view of a movable contact.
FIG. 5 is a partial cross-sectional view in an off state.
FIG. 6 is a partial cross-sectional view in a trip state.
FIG. 7 is a perspective view of a movable contact according to a second embodiment.
[Explanation of symbols]
28 Moving contact 30 Pin (support)
71 bent portion 72 bent piece 73 plate metal 74 gap

Claims (2)

A movable contact device for a circuit breaker, which is formed of a single sheet metal, has a movable contact at one end in the longitudinal direction, and has a support at the other end in the longitudinal direction. A contact part having the movable contact attached to one side in the thickness direction at one end in the longitudinal direction of the metal, and the other end in the longitudinal direction with the support part from the vicinity of the contact part of the plate-like metal from both sides in the short direction. A bent portion bent in the approaching direction, and the bent portion has a pair of bent pieces bent in contact with each other, and the width of the pair of bent pieces in the facing direction is A movable contactor device for a circuit breaker having a narrower width than one end side having the movable contact. A movable contact device for a circuit breaker, which is formed of a single sheet metal, has a movable contact at one end in the longitudinal direction, and has a support at the other end in the longitudinal direction. A contact part having the movable contact attached to one side in the thickness direction at one end in the longitudinal direction of the metal, and the other end in the longitudinal direction with the support part from the vicinity of the contact part of the plate-like metal from both sides in the short direction. A bent portion bent in the approaching direction, the bent portion having a pair of bent pieces bent in a non-contact state with each other, and the width of the pair of bent pieces in the facing direction. However, the movable contact device of the circuit breaker is narrower than the width of the one end side having the movable contact.

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