JP4960072B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker such as a circuit breaker for wiring or an earth leakage breaker, and more particularly to a circuit breaker provided with an improved switching mechanism.

  The circuit breaker has the role of interrupting the electric circuit in order to prevent burning of the electric wire and load equipment due to the overcurrent flowing, and operating the handle provided in this circuit breaker It also serves as a so-called switch that opens and closes. When opening and closing the circuit by operating the handle of the circuit breaker, to prevent welding between the fixed contact and the movable contact, and to simultaneously open and close multiple contacts, the fixed contact is not affected regardless of the handle operating speed. It is preferable that the movable contact is brought into contact or separated rapidly. Conventionally, in order to realize the rapid operation of this movable contact, so-called quick-make and quick-break (hereinafter simply referred to as “early-turn / fast-cut”), the circuit breaker is opened and closed. As a mechanism, it is generally known to adopt a toggle link mechanism using an upper link having a rotation center on a lever and a lower link coupled to the other end of the upper link (for example, Patent Document 1). reference).

JP 2000-133111 A

  Although a conventional circuit breaker equipped with a conventional toggle link mechanism has the above-mentioned advantages over a circuit breaker that is not a quick-turn / quick-cut type, the number of parts of the opening / closing mechanism is large. There existed a subject that the dimension of the width direction became large.

  The present invention has been made to solve the above-mentioned problems in the conventional circuit breaker, and is a type in which the movable contact is quickly turned on and off with respect to the fixed contact, and the width of the switching mechanism portion. An object of the present invention is to provide a circuit breaker capable of reducing the size of the direction.

The circuit breaker according to the present invention includes a fixed contact, a movable contact having at least one movable contact that contacts or separates from the fixed contact, a crossbar that holds the movable contact, and a crossbar. A link having one end connected to drive the cross bar to bring the movable contact into contact with or away from the fixed contact; an on position corresponding to a position operated from outside and the movable contact contacting the fixed contact; and A handle in which a movable contact moves between an off position corresponding to a position separated from the fixed contact, a spring pin fixed to the other end of the link, and one end fixed to the spring pin and the other end to the handle or A main spring fixed to a member that moves as the handle moves, and a spring pin that is supported rotatably and directly or indirectly to the spring pin Circuit breaking with a lever having an abutment to hold against the spring pin to the load by the main spring contact, and a latch means for preventing rotation of the lever engaged with the lever The abutting portion of the lever is configured such that the load vector acting on the lever at the abutting position with the spring pin corresponding to the on position of the handle is changed from the on position of the handle to the off position. During the process of moving to the position, an overlap in a plane including the axis of the spring pin and the axis of the main spring occurs, and at the contact position with the spring pin corresponding to the off position of the handle. The load vector acting on the lever is a shaft of the spring pin during the process of moving the handle from the off position to the on position. It is characterized in that said to produce overlapping of the plane containing the axis of the main spring, with a configuration which satisfies at least one of a.

  According to the circuit breaker according to the present invention, a spring pin fixed to the other end of the link, a main spring fixed to the spring pin and one end fixed to the spring pin and the other end moving along with the movement of the handle, Since it has a lever that has a contact portion that is supported rotatably and directly or indirectly abuts against the spring pin and holds the spring pin against the load of the main spring, it has the characteristics as a circuit breaker. The size in the width direction of the opening / closing mechanism can be reduced without damage, and there is an effect that a space-saving and low-cost circuit breaker can be obtained.

  Further, in the circuit breaker according to the present invention, the contact portion of the lever is (1) a vector of the load acting on the lever at a contact position with the spring pin corresponding to the on position of the handle, Overlap of a plane including the axis of the spring pin and the axis of the main spring occurs during the process of moving the handle from the on position to the off position. (2) Corresponding to the handle off position. The load vector acting on the lever at the contact position with the spring pin is the axis of the spring pin and the axis of the main spring during the process of moving the handle from the off position to the on position. A structure that satisfies at least one of the conditions of generating an overlap with a plane including It is Rukoto, the width dimension of the opening and closing mechanism can be reduced, there is an effect that it is possible to obtain a space-saving, and low cost of the circuit breaker.

Embodiment 1 FIG.
1 to 9 show a circuit breaker according to Embodiment 1 of the present invention, FIG. 1 is a sectional view in a trip state, FIG. 2 is a side view of an opening / closing mechanism in the trip state, and FIG. FIG. 4 is a side view of the opening / closing mechanism in the on state, FIG. 5 is a side view of the opening / closing mechanism in the off state, and FIGS. FIG. 8 is an explanatory diagram for explaining the structure of the lever, and FIG. 9 is an explanatory diagram for explaining the operation of the opening / closing mechanism.

  In FIG. 1, a circuit breaker 1 includes a casing made of a synthetic resin base 2 and a synthetic resin cover 3. The power supply side conductor 4 fixed to the base 2 is bent in a substantially U shape and includes a fixed contact 5 at the inner end thereof. The power supply side conductor 4 is configured to be connectable to a power supply side conductor (not shown) by a screw (not shown) at the right end of the figure. The load-side terminal 6 fixed to the base 2 is configured to be connectable to a load-side electric circuit conductor (not shown) by a screw (not shown).

The handle 7 includes a handle 8 made of synthetic resin, and a metal handle frame 9 having one end fixed to the inside of the handle 8. The other end of the handle frame 9 is rotatably supported by a frame fixed to the base 2 by a pin 10. Handle 8 protrudes to the outside of the opening or al circuit breaker 1 of the cover 3, is operated from the outside, the pin 10 as a fulcrum, corresponding to the position where the movable contact 12 to be described later comes into contact with the fixed contact 5 The movable contact 12 is configured to be movable between the ON position and the OFF position corresponding to the separation position from the fixed contact 5. The movable contact 11 includes a movable contact 12 facing the fixed contact 5 at one end, and the other end is supported by the cross bar 13. The cross bar 13 is rotatably supported on the frame by pins 14.

  When the movable contact 12 is in contact with the fixed contact 5, that is, when the circuit breaker 1 is in the ON state, the power supply side terminal 4, the fixed contact 5, the movable contact 12, the movable contactor from the power supply side conductor of the electric circuit. 11 and the load side terminal 6 are energized to the load side conductor of the electric circuit.

  The link 15 includes a spring pin 17 at one end, and the other end is rotatably connected to the crossbar 13 by a pin 16. The main spring 18 constituted by a tension coil spring is stretched between a spring locking portion 19 provided at one end of the handle frame 9 and a spring pin 17 fixed to the link 15, and is always pulled by the spring pin 17. A load is applied. When the movable contact 12 is in the ON position where it contacts the fixed contact 5, the link 15 is prevented from further clockwise rotation by a stopper (not shown), and the movable contact 12 is separated from the fixed contact 5. When in the off position, further counterclockwise rotation is prevented by another stopper (not shown).

  The lever 20 is provided with an engaging portion 22 that is rotatably supported by a frame having a shaft portion 21 provided at one end and fixed to the base 2, and that engages with a latch 27 of a latch mechanism 25 to be described later. Yes. The lever 20 is engaged with a contact portion 23 that is in contact with the spring pin 17 and a locking portion 24 provided on the handle frame 9 to restrict the clockwise rotation of the lever 20. It has. The configuration of the contact portion 23 of the lever 20 will be described later.

  The latch means 25 includes a latch 27 that is rotatably supported by a pin 26. The latch 27 engages with the engaging portion 22 of the lever 20 to prevent the lever 20 from rotating clockwise. When the latch 27 is rotated clockwise around the pin 26 while being engaged with the engaging portion 22 of the lever 20, the latch 27 is disengaged from the engaging portion 22 of the lever 20. Allows clockwise rotation.

  When a negative overcurrent of a first predetermined value or more flows for a predetermined time or longer, the bimetal 28 responds to heat generated by the negative overcurrent and the end portion provided with the screw 29 bends to the right in the figure. 29, the latch 27 is rotated clockwise about the pin 26, the engagement between the latch 27 and the engaging portion 22 of the lever 20 is released, and the lever 20 can be rotated clockwise. The latch means 25 having the bimetal 28, the screw 29, and the latch 27 constitutes a long time overcurrent tripping means.

  In addition to the long time overcurrent tripping means, short time tripping means is provided. This short time delay trip means instantaneously rotates the latch 27 in the clockwise direction based on the electromagnetic force generated by the negative overcurrent when an excessive negative overcurrent exceeding the second predetermined value flows. The latch 27 and the engaging portion 22 of the lever 20 are disengaged, and the lever 20 can be rotated clockwise. Note that the operation of the short time trip means is performed almost in synchronism with the separation operation of the movable contact 12 from the fixed contact 5 by the electromagnetic repulsive force.

  The arc extinguishing means 30 is composed of a plurality of arc extinguishing plates provided in the vicinity of the movable contact 12 and attracts an arc generated when the movable contact 12 is separated from the fixed contact 5 to the arc extinguishing plate side by electromagnetic force. Arc extinguishing.

  Next, the details of the opening / closing mechanism part including the handle 7, the lever 20, the link 15, the spring pin 17, the main spring 18, the crossbar 13, etc., which are the main parts of the circuit breaker according to the first embodiment of the present invention. explain. FIG. 4 shows the state of the opening / closing mechanism in the on position where the movable contact 12 contacts the fixed contact 5, and the handle 7 is in the on position. At this time, as shown in FIG. 6, the spring locking portion 19 of the handle frame 9 is the rightmost end of the moving range 70 represented by a fan-shaped arc centered on the pin 10 that rotatably supports the handle frame 9. 701. Further, the engaging portion 22 of the lever 20 is engaged with the latch 27 of the latch means 25.

  In the state shown in FIG. 6, the contact portion 23 of the lever 20 that is in contact with the spring pin 17 receives a pressing force based on the overload vector V <b> 1 by the main spring 18. Further, as described above, the link 15 is prevented from rotating clockwise by the stopper and is stationary. The lever 20 is urged to rotate clockwise around the shaft portion 21 by the load vector V1, but since the engaging portion 22 of the lever 20 is engaged with the latch 27, the lever 20 is rotated. Is blocked. Further, the link 15 is pushed downward in FIG. 6 by the contact portion 23 of the lever 20 via the spring pin 17, and the movable contact 11 is pushed down to the illustrated position via the cross bar 13 to fix the movable contact 12. The contact 5 is in contact.

  Next, when the handle 8 of the handle 7 is moved in the direction of arrow A from the on state shown in FIG. 6, the spring locking portion 19 of the handle frame 9 is accordingly moved from the position 701 along the arc 70. Move to the left of 6. During the movement process, the overload vector V1 due to the main spring 18 overlaps on a plane including the axis of the spring pin 17 and the axis of the main spring 18. When the handle 7 further moves in the direction of arrow A and the overload vector V1 due to the main spring 18 exceeds the overlap on the plane, the direction of the load vector V1 changes to the upper right direction in FIG. The spring pin 17 is driven to the left in FIG. 6 to slide on the surface of the contact portion 23 of the lever 20 and moves from the stationary position 171 shown in FIG. 6 to the stationary position 172 shown in FIG.

  The link 15 is driven by the movement of the spring pin 17 from the stationary position 171 to the stationary position 172 and rotates the cross bar 13 counterclockwise about the pin 14. As a result, the movable contact 11 is pulled up from the position shown in FIG. 6 to the position shown in FIG. 7, and the movable contact 12 is separated from the fixed contact 5 and is in the off position. In the off position, the link 15 is prevented from rotating counterclockwise by the stopper as described above and stops. Further, the handle 7 is stationary at the position shown in FIG. 7 which is the off position, and the spring locking portion 19 is at the position of the leftmost end 702. In the off position shown in FIG. 7, the contact portion 23 of the lever 20 that is in contact with the spring pin 17 receives a pressing force by the load vector V <b> 2 by the main spring 18. FIG. 5 shows the state of the opening / closing mechanism in the off position.

  Next, when the handle 8 of the handle 7 is moved in the direction of arrow B from the on state shown in FIG. 7, the spring locking portion 19 of the handle frame 9 is accordingly moved from the position 702 along the arc 70. Move to the right of 7. During the movement process, the overload vector V2 due to the main spring 18 overlaps on a plane including the axis of the spring pin 17 and the axis of the main spring 18. When the handle 7 further moves in the direction of arrow B and the overload vector V2 by the main spring 18 exceeds the overlap on the plane, the direction of the vector V2 changes to the upper left direction in FIG. 7 is driven to the right in FIG. 7 to slide on the surface of the contact portion 23 of the lever 20, and moves from the stationary position 172 shown in FIG. 7 to the stationary position 171 shown in FIG.

  The link 15 is driven by the movement of the spring pin 17 from the stationary position 172 to the stationary position 171 and rotates the cross bar 13 clockwise about the pin 14. As a result, the movable contact 11 is pulled down from the position shown in FIG. 7 to the position shown in FIG. 6, and the movable contact 12 comes into contact with the fixed contact 5 and becomes the on position. In this ON position, the link 15 is prevented from rotating clockwise by the stopper as described above and stops. Further, the handle 7 is stationary at the position shown in FIG. 6 which is the on position, and the spring locking portion 19 is at the position of the rightmost end 701. In the ON position shown in FIG. 6, the contact portion 23 of the lever 20 that is in contact with the spring pin 17 receives a pressing force by the load vector V <b> 1 by the main spring 18.

  Here, the contact portion 23 of the lever 20 will be described. As described above, the abutment portion 23 of the lever 20 is such that the vector V1 of the overload caused by the main spring 18 causes the shaft center of the spring pin 17 and the main spring 18 to move while the handle 7 moves from the on position to the off position. The spring pin 17 is moved in the direction of the off position of the handle 7 when the plane overlaps the plane including the axis, and when the overlap is exceeded, and in the process of moving the handle 7 from the off position to the on position, When the overload vector V2 due to the spring 18 overlaps the plane including the axis of the spring pin 17 and the axis of the main spring 18 and exceeds the overlap on the plane, the spring pin 17 is moved to the on position of the handle 7. It is comprised in the shape moved to the direction.

  Due to the shape of the contact portion 23, the load by the main spring 18 causes the handle 7 to be held until the spring locking portion 19 that supports the main spring 18 exceeds the position of the load vector V 1 or V 2 by the main spring 18. This means that the spring pin 17 is stably held at the stationary position 171 or 172 in the contact portion 23 of the lever 20 during the period of returning to the position before the movement. That is, even if an operation load below a threshold is applied to the handle 7 in the on position or the off position, or vibration is applied to the opening / closing mechanism, the handle 7 and the movable contact 12 are stabilized in the on position or the off position. It can be kept.

  On the other hand, when the movable contact 12 is in the on position in contact with the fixed contact 5, the spring pin 17 exerts a normal force against the load vector V 1 by the main spring 18 on the spring pin 17, as shown in FIG. Assuming that the vertical drag vector is now V11, the direction of the vertical drag vector V11 is 5 with respect to the straight line 150 connecting the axis of the spring pin 17 and the axis of the pin 16 of the link 15. The contact portion 23 of the lever 20 is formed so as to form an angle of less than or equal to °. As a result, the vector of the force by which the link 15 pushes the cross bar 13 downward and the vector V11 of the vertical drag by which the spring pin 17 pushes the link 15 substantially coincide with each other, and the cross bar 13 is more efficiently against the load by the main spring 18. Can be held in the ON position.

According to the first embodiment, the contact portion 23 of the lever 20 is specifically configured by a curved surface extending in a direction parallel to the direction of the axis of the spring pin 17. The curved surface is configured based on a shape along a part of an arc having a radius R having a center point 231 in the vicinity of the spring locking portion 19 of the lever 20. The position of the center point 231 of the arc and the radius R are determined based on which position in the process of moving the handle 7 at the on position to the off position, and when the handle 7 at the off position is at the on position. The position of the spring pin to be moved can be arbitrarily determined by the design philosophy at which position in the process of moving to. By configuring the contact portion 23 of the lever 4 with a curved surface as described above, the movement of the spring pin 17 is smooth, and the movement of the spring pin 17 is not hindered by the protrusions or the like.

  Further, the arc serving as the reference for the curved surface of the contact portion 23 of the lever 20 has the position of the center point 131 and the radius R of the direction of the vector V11 of the normal force acting on the link 15 as described above. It is set so as to form an angle of 5 ° or less with respect to a straight line 150 connecting the 17 axis and the axis of the pin 16 of the link 15.

  Next, the trip operation of the opening / closing mechanism will be described. When the circuit breaker 1 shown in FIGS. 4 and 6 is in the ON state, if a load current of a first predetermined value or more flows for a predetermined time or longer, the bimetal 28 of the long-time tripping means is bent and the screw 29 is The latch 27 of the latch means 25 is pressed and rotated clockwise. As a result, the engagement between the engagement portion 22 of the lever 20 and the latch 27 is released, and the lever 20 receiving the load by the main spring 18 rotates clockwise around the shaft portion 21 to be locked. The end portion 201 comes into contact with the locking portion 24 of the handle frame 9 and stops. FIG. 2 shows this trip state, and FIG. 3 shows a part of the opening / closing mechanism part in the trip state.

  When the lever 20 is rotated to the position shown in FIG. 2 by the trip operation of the opening / closing mechanism, the spring pin 17 receiving the load by the main spring 18 is in contact with the contact portion 23 of the lever 20 shown in FIGS. It moves from the stationary position 171 to the stationary position 173 shown in FIG. As a result, the link 15 is pulled upward in the figure, the movable contact 11 is rotated counterclockwise, and the movable contact 12 is moved away from the fixed contact 5 to turn off the circuit.

  When a load current exceeding a second predetermined value greater than the first predetermined value, for example, a short-circuit current, flows, the short time trip means operates instantaneously in combination with the electromagnetic repulsion operation of the movable contact 12. Thus, the latch 27 of the latch means 25 is rotated clockwise. Thereby, the movable contact 12 is moved away from the fixed contact 5 in the same manner as the above-described operation by the long time tripping means, and the circuit is turned off.

  As described above, according to the circuit breaker according to the first embodiment of the present invention, the upper link that conventionally connects the lever and the spring pin, which has been a factor of increasing the width dimension due to the configuration of the switching mechanism, This eliminates the need for the shaft or protrusion that constitutes the center of rotation of the upper link. Therefore, the width of the opening / closing mechanism can be reduced, and the number of parts can be reduced.

Embodiment 2. FIG.
FIG. 10 is an explanatory view showing a lever of the circuit breaker according to Embodiment 2 of the present invention. In the second embodiment, as shown by a broken line in FIG. A curved surface 233 is used. For comparison, in FIG. 10, the shape of the contact portion according to the first embodiment is indicated by a solid line. The flat surface 231 of the abutting portion 23 constitutes a surface on which the spring pin 17 abuts at the on position of the handle, and the flat surface 232 constitutes a surface on which the spring pin 17 abuts at the off position of the handle. . The curved surface 233 is formed between the flat surfaces 231 and 232 and constitutes a surface on which the spring pin 17 moves during the process of moving the handle from the on position to the off position and from the off position to the on position. .

  At the stationary position 171 of the spring pin 17 corresponding to the on position of the handle, the direction of the load vector by the main spring 18 on which the spring pin 17 acts on the lever 20 is determined by the shape of the contact portion 23 of the lever 20. The The flat surface 231 of the contact portion 23 of the lever 20 according to the second embodiment is configured such that the load vector by the main spring 18 at the on position of the handle 7 is V4. The direction of the load vector V4 is a direction away from the on position of the spring locking portion 19 of the handle frame 9 supporting the main spring 18 to the off position side as compared to the direction of the vector V3 for comparison. .

  When the direction of the load vector V4 acting on the lever 20 moves away from the on position of the spring locking portion 19 of the handle frame 9 to the off position side, the spring pin 17 is moved when the handle 7 moves from the on position to the off position. The timing for moving from the stationary position 171 will be delayed. That is, in the case of the vector V4 as compared with the case of the vector V3, the timing for moving the spring pin 17 to the stationary position 172 (see FIG. 7), which is the off position, is delayed, and the timing for moving the movable contact away from the fixed contact is set. Can be delayed. On the contrary, the timing of the movement of the spring pin 17 can be advanced by changing the angle of the flat surface 231 of the contact portion 23.

  Similarly, the other flat surface 232 of the contact portion 23 of the lever 20 has a timing when the spring pin 17 moves from the on position to the off position when the handle moves from the off position to the on position. The timing is set so as to match. The curved surface 233 of the contact portion 23 of the lever 20 facilitates the movement of the spring pin 17. Other configurations are the same as those in the first embodiment.

  As described above, in the second embodiment, the contact portion 23 of the lever 20 is formed by a combination of a plurality of planes and curved surfaces. It is possible to arbitrarily set the operation characteristics of the spring pin 17 such as speed and acceleration during the movement along the contact portion 23.

  Of course, the configuration of the contact portion 23 of the lever 20 is not limited to a combination of a plane and a curved surface, but may be a combination of only a plurality of planes or a combination of only a plurality of curved surfaces.

Embodiment 3 FIG.
11A and 11B show a part of an opening / closing mechanism portion of a circuit breaker according to Embodiment 3 of the present invention. FIG. 11A is a front view thereof, and FIG. 11B is a side view of a spring pin 17. In the third embodiment, intermediate members 41 and 42 are attached to the contact portion of the spring pin 17 with the lever 20 so as to be coaxial with the axis of the spring pin 17 and to be rotatable around the axis. Other configurations are the same as those in the first or second embodiment. By causing the intermediate members 41 and 42 to contact the contact portion 23 of the lever 20, the movement of the spring pin 17 at the contact portion 23 of the lever 20 can be made smoother, and the spring pin 17 and the lever 20. Wear can be reduced.

Embodiment 4 FIG.
FIG. 12 is a front view showing a part of the opening / closing mechanism of the circuit breaker according to Embodiment 4 of the present invention. In the fourth embodiment, both ends 43 and 44 of the spring pin 17 in the vicinity of the contact portion with the lever 20 are centered on the axis of the spring pin 17 and the end of the spring pin 17 has a large diameter. Conical shape. Other configurations are the same as those in the first or second embodiment. According to the fourth embodiment, the spring pin 17 can be prevented from shifting in the axial direction of the spring pin 17 from the contact portion 23 of the lever 20, and the spring pin 17 can be prevented from moving on the contact portion 23 of the lever 20. It can be moved stably.

Embodiment 5 FIG.
FIG. 13: is a front view which shows a part of switching mechanism part of the circuit breaker based on Embodiment 5 of this invention. In the fifth embodiment, both end portions 45 and 46 of the spring pin 17 are provided with conical portions having a large diameter on the end side of the spring pin 17, and both end portions 45 and 46 of the conical portion are brought into contact with the lever 20. The surface of the contact portion 23 of the lever 20 is an inclined surface that matches the shape of the conical portions of both end portions 45 and 46 of the spring pin 17. Other configurations are the same as those in the first or second embodiment. According to the fifth embodiment, the shape of the surface of the contact portion 23 of the lever 20 matches the shape of the surface of the conical portions of both end portions 45 and 46 of the spring pin 17 that contacts the contact portion 23. And since it is inclined, the contact area between the spring pin 17 and the contact portion 23 of the lever 20 can be increased, and the wear of the sliding portion can be reduced by reducing the surface pressure of the contact portion. .

Embodiment 6 FIG.
FIG. 14 is a front view showing a part of an opening / closing mechanism portion of a circuit breaker according to Embodiment 6 of the present invention. In the first to fifth embodiments, the lever 20 includes two abutting portions 23 provided at a distance from each other, and the spring pin 17 abuts on these two abutting portions 23. However, in the sixth embodiment, the main spring is constituted by two main springs 181 and 182 arranged side by side, and the lever 20 is disposed between the main springs 181 and 182. There is only one contact portion 23.

  One spring pin 17 locks the main springs 181 and 182, respectively, and is in contact with the contact portion 23 of the lever 20 at substantially the center in the axial direction. The portion of the spring pin 17 that contacts the contact portion 23 of the lever 20 is composed of two conical shapes 47 and 48 that are integrally formed with the small diameter portions facing each other as shown in FIG. The portion 23 has an inclined surface that matches the inclination of the surfaces of the two conical shapes 47 and 48. Other configurations are the same as those in the first or second embodiment.

  According to the sixth embodiment, the structure of the opening / closing mechanism can be simplified while the two main springs 181 and 182 are provided, and the contact between the spring pin 17 and the contact portion 23 of the lever 20 is achieved. Can be stabilized.

  The circuit breaker of the present invention is not limited to the first to sixth embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

It is sectional drawing which shows the circuit breaker concerning Embodiment 1 of this invention. It is a side view of the switching mechanism part in the trip state of the circuit breaker concerning Embodiment 1 of this invention. It is a front view of a part of switching mechanism part in the trip state of the circuit breaker concerning Embodiment 1 of this invention. It is a side view of the opening-closing mechanism part in the ON state of the circuit breaker concerning Embodiment 1 of this invention. It is a side view of the opening-and-closing mechanism part in the OFF state of the circuit breaker concerning Embodiment 1 of this invention. It is explanatory drawing for demonstrating operation | movement of the circuit breaker which concerns on Embodiment 1 of this invention. It is explanatory drawing for demonstrating operation | movement of the circuit breaker which concerns on Embodiment 1 of this invention. It is explanatory drawing explaining the structure of the lever of the circuit breaker which concerns on Embodiment 1 of this invention. It is explanatory drawing for demonstrating operation | movement of the switching mechanism part in the trip state of the circuit breaker which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the structure of the lever of the circuit breaker which concerns on Embodiment 2 of this invention. A part of switching mechanism part of the circuit breaker concerning Embodiment 3 of this invention is shown, (a) is the front view, and (b) is a side view. It is a one part front view of the opening-closing mechanism part of the circuit breaker concerning Embodiment 4 of this invention. It is a one part front view of the opening-closing mechanism part of the circuit breaker concerning Embodiment 5 of this invention. It is a one part front view of the opening-closing mechanism part of the circuit breaker concerning Embodiment 6 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Base 3 Cover 4 Power supply side conductor 5 Fixed contact 6 Load side terminal 7 Handle 8 Handle 9 Handle frame 10, 14, 16, 26 Pin 11 Movable contact 12 Movable contact 13 Crossbar 15 Link 17 Spring pin 18 , 181, 182 Main spring 19 Spring locking part 19
20 Lever 21 Shaft 21
22 engaging portion 23 abutting portion 24 locking portion 25 latch means 28 bimetal 29 screw 30 arc extinguishing means 41, 42 intermediate member

Claims (8)

A fixed contact, a movable contact having at least one movable contact that contacts or separates from the fixed contact, a cross bar that holds the movable contact, and one end connected to the cross bar to drive the cross bar The movable contact is separated from the fixed contact, the link that contacts or separates the movable contact from the fixed contact, the ON position corresponding to the position where the movable contact is in contact with the fixed contact, and the movable contact. A handle that moves between an off position corresponding to the position, a spring pin that is fixed to the other end of the link, one end that is fixed to the spring pin, and the other end that moves as the handle or the handle moves. A main spring fixed to the member, and a spring pin that is rotatably supported and directly or indirectly abuts on the spring pin. The A wherein the lever having an abutment to hold against the load due to the main spring, the circuit breaker and a latching means for preventing rotation of the lever engaged with the lever,
The abutting portion of the lever is a process in which the vector of the load acting on the lever at the abutting position with the spring pin corresponding to the on position of the handle is moved from the on position of the handle to the off position. Between the axis of the spring pin and the axis of the main spring, and the lever acting at the contact position with the spring pin corresponding to the off position of the handle. The load vector to be overlapped on a plane including the axis of the spring pin and the axis of the main spring during the process of moving the handle from the off position to the on position; It has a configuration that satisfies at least one of
A circuit breaker characterized by that. 2. The circuit breaker according to claim 1, wherein the contact portion of the lever includes a curved surface extending in a direction parallel to a direction of an axis of the spring pin . The circuit breaker according to claim 2 , wherein the curved surface is configured based on an arc centered on an arbitrary hand . The contact portion of the lever is a combination of any one of a curved surface extending in a direction parallel to the axial center direction of the spring pin and a plane extending in a direction parallel to the axial center direction of the spring pin. The circuit breaker according to claim 3 , wherein the circuit breaker is configured. When the handle is in the on position, the direction of the normal force vector against the load that the spring pin receives from the lever is a straight line connecting the axis of the spring pin and one end connected to the cross bar of the link. The circuit breaker according to claim 1 , wherein the circuit breaker is at an angle of 5 ° or less . The spring pin includes an intermediate member that is coaxial with an axis of the spring pin and rotatably provided around the axis, and the spring pin contacts the contact portion of the lever via the intermediate member. The circuit breaker according to claim 1 . 2. The circuit breaker according to claim 1 , wherein the spring pin includes a conical portion having an axial center of the spring pin, and the conical portion contacts an abutting portion of the lever . The circuit breaker according to claim 7, wherein the contact portion of the lever has an inclination along an inclination of the conical portion .

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