JP2008034313A - Circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit breaker which allows solid adhesive fixing of adjustment screws even when adjustment screws for adjusting the relative position between a bimetal and a tripping member are readjusted. <P>SOLUTION: A chassis 1 consisting of a body 2 and a cover 3 houses a contact 6; a tripping member 55 which is engaged with a latch member 54 with the contact-opening direction force accumulated during normal operation time when no overcurrent flows through the contact 6, and forces the contact part 6 to open by the accumulated force in the event of disengagement with the latch member 54; a bimetal which performs a pushing drive of the tripping member 55 in the engaging release direction when overcurrent flows through the current-carrying path; an adjustment screw 57 for adjusting the relative position between the bimetal 22 and tripping member 55; and a nut member 58 for screwing adjustment screw 57. On the lateral sides of the body 2 and cover 3 in parallel to the forward/backward moving direction of the adjustment screw 57, adhesive injection through-holes 3g and 3h are provided with the size large enough to visually check both sides of the adjustment screw 57 projecting from both sides of the nut member 58. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a circuit breaker having a function of forcibly opening a contact portion when an overcurrent flows.

  Conventionally, as this type of circuit breaker, a circuit breaker having a thermal release mechanism using a bimetal has been provided (see, for example, Patent Document 1).

  In the circuit breaker disclosed in the above document, input / output terminals are arranged on both the left and right sides of the container body, and a contact portion interposed between the input / output terminals is arranged in the central portion. The circuit breaker also includes an opening / closing mechanism for driving one end side of a latch member connected via a link to a handle projecting from the upper surface of the container body to the release member and opening / closing the contact portion on the other end side. The one end side is a fixed end and the other end side is a free end, and is arranged in the vertical direction of the container body. When an overcurrent flows, the free end pushes the release member and the latch member. A bimetal that releases the latched state with the tripping member and forcibly opens the contact portion, and an adjustment screw that adjusts the relative positional relationship between the free end of the bimetal and the tripping member are provided.

The adjustment screw can be adjusted from an operation hole provided on the upper surface of the container. After adjustment of the adjustment screw, an adhesive is applied to the member to which the adjustment screw is screwed through the operation hole. In addition, the adjustment position between the free end of the bimetal and the tripping member is prevented from changing by preventing the adjustment screw from rotating.
Japanese Patent Laid-Open No. 11-45651 (see paragraph numbers [0018]-[0031] and FIGS. 1 and 3)

  In the circuit breaker described above, the adjustment screw is provided so as to be movable back and forth in the vertical direction of the container body, and after adjustment, the adhesive is applied from the upper surface side of the container body. The adhesive could only be applied to one side (upper surface). Therefore, after finishing the adjustment and applying the adhesive, if you want to adjust the position of the free end of the bimetal again, the adjustment screw is forcibly rotated to attach the adjustment screw to the member to which the adjustment screw is screwed. After forcibly canceling and re-adjusting, the adhesive is applied again, but since the adhesive is newly applied over the previously applied adhesive, the adjustment screw is firmly attached It is impossible to adjust the position of the bimetal free end and the tripping member.

  The present invention has been made in view of the above problems, and its object is to firmly fix the adjustment screw even when the adjustment screw for adjusting the relative position between the bimetal and the tripping member is adjusted again. It is to provide a circuit breaker that can be used.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the contact portion inserted into the energizing circuit between the power source and the load is disposed inside the container, and the contact portion is overcurrentd in a closed state. When the normal force is not flowing, the contact is locked with the latch member in a state where the force to open the contact is stored. When the latch member is released, the contact force is forcibly opened by the accumulated force. A tripping member, a bimetal that has one end side as a fixed end and the other end side as a free end, and when the overcurrent flows through the energization circuit, the free end pulls the member in the unlocking direction, and An adjustment screw that changes the relative positional relationship between the bimetal and the tripping member, and a nut member through which a screw hole into which the adjustment screw is screwed are housed, and the body parallel to the advancing and retreating direction of the adjustment screw. Adjustment screws projecting from both sides of the nut member on the side Characterized in that a bonding agent injection hole in the visible bilateral site size.

  The invention of claim 2 is characterized in that, in the invention of claim 1, a plurality of adhesive injection holes are formed side by side in a direction orthogonal to the advancing and retreating direction of the adjusting screw on the side surface of the container.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the adhesive injection holes are formed on both side surfaces of the container body facing each other in a direction perpendicular to the advancing / retreating direction of the adjusting screw. .

  According to the first aspect of the present invention, it is possible to individually inject the adhesive into the adjustment screw portions protruding from both side surfaces of the nut member through the adhesive injection hole. Therefore, after the adjustment of the adjustment screw is finished, an adhesive is attached to one surface of the nut member and the adjustment screw is adhered and fixed, and then the adjustment screw is forcibly rotated to peel off the adhesion state of the adjustment screw. Is adjusted again, the adhesive screw can be attached to the other surface of the nut member to fix the adjustment screw, so that it is not necessary to attach the adhesive again on the adhesive previously applied. Even when the bonding operation is performed again, the adjustment screw can be firmly bonded, and the adjustment position of the adjustment screw can be reliably prevented from shifting.

  According to the second aspect of the present invention, since the plurality of adhesive injection holes are formed side by side in the direction orthogonal to the advance / retreat direction of the adjusting screw on the side surface of the container body, After fixing the adjustment screw by injecting the adhesive from the adhesive injection hole, the adjustment screw is forcibly rotated to peel off the adhesion state of the adjustment screw and the position of the adjustment screw is adjusted again. The adhesive can be injected from another adhesive injection hole to which no adhesive has been injected. Therefore, on each surface of the nut member, it is possible to newly attach the adhesive to the part of the adjusting screw to which the adhesive is not attached, and without attaching the adhesive on the adhesive that has been previously attached. Therefore, even when the bonding operation is performed again, the adjustment screw can be firmly bonded, and the adjustment position of the adjustment screw can be reliably prevented from shifting.

  According to the invention of claim 3, since the adhesive injection holes are respectively formed on the two side surfaces of the container that are opposed in the direction orthogonal to the advancing and retreating direction of the adjusting screw, the adhesive injection provided on one side surface After fixing the adjustment screw by injecting the adhesive from the working hole, the adjustment screw was forcibly rotated to peel off the adhesion state of the adjustment screw, and the position of the adjustment screw was adjusted again. By injecting the adhesive from the adhesive injection hole, the adhesive can be newly attached to the portion of the adjusting screw to which the adhesive has not already been attached. Therefore, even when the adjustment operation is performed again and the adjustment screw is bonded again, the adjustment screw can be firmly bonded, and the adjustment position of the adjustment screw can be reliably prevented from shifting.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  The circuit breaker of the present embodiment is disposed inside the distribution board as a branch breaker together with the main breaker, for example, and performs a thermal release operation or an electromagnetic release operation when an overcurrent or a short-circuit current flows through each branch circuit. Thus, the branch circuit is protected. In the following description, for the sake of convenience, the vertical and horizontal directions are defined in the direction shown in FIG. 3A, and the lower side in FIG. 3B will be described as the front side and the upper side as the rear side. It is arrange | positioned inside a distribution board so that the left-right direction in Fig.3 (a) may follow an up-down direction.

  The device body 1 of the circuit breaker A has a horizontally long rectangular parallelepiped shape, and as shown in FIGS. 3 and 10, the body 2 and the cover 3 which are halves divided into two in the thickness direction (front-rear direction) are combined. Configured. In the body 1, a contact portion 6 including a movable contact 4 and a fixed contact 5, an opening / closing mechanism portion 8 for opening / closing the contact portion 6 in accordance with an opening / closing operation of the handle 7, and closing of the contact portion 6. When the overcurrent does not flow to the contact part 6 in the normal state, the movable contact 4 accumulates a force in the direction away from the fixed contact 5, and when the overcurrent flows to the contact part 6, the normal accumulated force is released to contact the contact part 6. And a forced opening mechanism portion 9 for forcibly opening the portion 6.

  The body 2 and the cover 3 are formed in a box shape with a single-side opening with the central portion on the upper surface side projecting upward by an insulating synthetic resin such as nylon resin, for example, at the opening edge of the body 2 and the cover 3. Each has four sets of assembly holes 2a and 3a. Thus, after the body 2 and the cover 3 are combined so that the inner surfaces face each other, and the rivets 11 are inserted into the assembly holes 2a and 3a of each set, the body 2 and the cover 3 are fixed and the body 1 Will be configured. The center of the upper surface of the body 2 and the cover 3 protrudes upward as compared with the left and right sides. U-shaped square grooves 2b and 3b serving as the opening 1a for the handle 7 and the display member 52 are formed on the surface of the convex portion. U-shaped square grooves 2e and 3e are formed as opening windows 1b.

  Further, on the right side surfaces of the body 2 and the cover 3, a U-shaped square groove serving as an opening into which a wiring member such as a power supply side electric wire or bus bar is inserted (FIG. 10 shows only the square groove 2c of the body 2). The left side surfaces of the body 2 and the cover 3 are formed with U-shaped square grooves 2d and 3d, which are openings into which wiring members such as load-side electric wires and bus bars are inserted, respectively. Further, a U-shaped square groove 2f is formed on the left side surface of the body 2 above the square groove 2d, and a U-shaped protruding piece 3f inserted halfway into the square groove 2f is formed on the left side surface of the cover 3. Is formed. Thus, in the state where the body 2 and the cover 3 are coupled, the right half of the square groove 2f is closed by the protruding piece 3f, and an adjustment tool (for example, a flat-blade screwdriver) for adjusting the adjustment screw 57 described later by the remaining part of the square groove 2f. ) Is inserted.

  A slider 12 is attached to the lower part of the container body 1 so as to be movable in the left-right direction of the container body 1, and a flange of a mounting rail 90 (see FIG. 1) such as a DIN rail disposed inside the distribution board. By locking the slider 12 to the portion 91, the container 1 is attached to the mounting rail 90.

  The power source side terminal portion 13 and the load side terminal portion 14 are accommodated in both sides in the longitudinal direction of the vessel body 1. The power supply side terminal portion 13 is formed by bending a sheet metal into a cylindrical shape having a square cross section, and has a terminal fitting 15 having a screw hole 15a on the upper surface, and a tightening screw 16 screwed into the screw hole 15a of the terminal fitting 15. And a power supply side terminal 17. The power source side terminal 17 is formed in a U shape when viewed from the front side, and has an insertion hole 17a through which the tightening screw 16 is inserted into the upper piece, and a terminal through which the lower piece is inserted into the terminal fitting 15 It is part 17b. Further, the power supply side terminal 17 includes a fixed contact plate 17c extending downward from the tip of the upper piece and having the fixed contact 5 fixed to an intermediate portion thereof, and a conductive arc is provided on the lower side of the fixed contact plate 17c. A travel plate 18 is connected. The arc traveling plate 18 has a narrow width extending from the lower side portion of the fixed contact plate 17c in the direction of the electromagnetic force acting on the arc (left obliquely downward) by the interaction with the magnetic field generated around the movable contact 4. An arc traveling portion 18a and a rectangular plate-shaped main portion 18b projecting along the bottom surface of the container 1 from the lower end of the arc traveling portion 18a are provided. The arc traveling plate 18 can extend the arc generated when the contact portion 6 is opened toward the lower surface of the container 1, and the arc is extinguished by the arc extinguishing grid 19 disposed on the upper side of the main portion 18 b. It is like that. Note that iron pieces 25 for increasing the magnetic field generated around the contact portion 6 are arranged on the front and rear sides of the contact portion 6 via the inner case 26, respectively. Insulating sheets 27 are arranged before and after the arc extinguishing grid 19, respectively. Further, an insulating sheet 27 is disposed between a coil 29 and a support plate 23 described later on the upper side of the arc extinguishing grid 19, and an insulating sheet 27 is disposed between the arc traveling plate 18 and the bottom surfaces of the body 2 and the cover 3 on the lower side. Is arranged (see FIG. 1).

  The load side terminal portion 14 includes a terminal fitting 15 and a tightening screw 16 as well as the power source side terminal portion 13 and also includes a load side terminal 20. The load side terminal 20 is formed in a U shape when viewed from the front side, and a center piece is inserted into the terminal fitting 15 with both side pieces facing upward. Further, the right side piece of the load side terminal 20 is electrically connected to the lower end (fixed end) of the long and narrow bimetal 22 via a flexible electric wire 21 having flexibility such as a braided wire. The intermediate portion in the longitudinal direction of the bimetal 22 is connected to one end of the coil 29 through the flexible electric wire 30, and the other end of the coil 29 is electrically connected to the movable contact 47 through the flexible electric wire 31. . Thus, in a state where the movable contact 4 and the fixed contact 5 of the movable contact 47 are closed, the power supply side terminal portion 13 -the contact portion 6 -the movable contact 47 -the coil 29 -the bimetal 22 -the load side terminal portion. A main electric circuit through which a current flows through a path 14 is formed.

  Here, an arc-shaped groove constituting the tool insertion hole 1c is formed in a portion facing the tightening screw 16 at the opening edge portion of the upper surface of the body 2 and the cover 3 (see FIGS. 1 and 3). The tightening screw 16 is restricted from moving in the vertical direction inside the body 1, and when the tightening screw 16 is rotated by a screwdriver (not shown) inserted through the tool insertion hole 1c, the tightening screw 16 is inserted into the screw hole 15a. The terminal fitting 15 into which 16 is screwed up is raised or lowered. Therefore, when the tightening screw 16 is rotated in the direction in which the terminal fitting 15 rises, the terminal fitting 15 moves upward, and the terminal portion 17b of the power supply side terminal 17 or the center piece of the load side terminal 20 and the lower side of the terminal fitting 15 A wiring member is press-connected between the piece 15b.

  Next, the handle 7 and the opening / closing mechanism 8 will be described. The handle 7 includes a cylindrical main body 7a that is rotatably supported via a handle shaft 40 that is bridged along the thickness direction (front-rear direction) of the main body 1 inside the main body 1, and a main body 7a. Projecting from the upper surface (one side in the short direction) of the container body 1 to the outside of the container body 1, and the container body on the lower right peripheral surface of the main body section 7a 1 is integrally provided with a projecting portion 7c projecting toward the inside of 1, and is biased in the off direction (leftward in FIG. 1) by a handle return spring 41 made of a torsion coil spring. In addition, an operation knob 42 is attached to the operation portion 7b protruding to the outside of the body 1.

  The opening / closing mechanism 8 includes links 44, 44, a contact holder 46, a contact pressure spring 49, a display member 52, an urging spring 53, and the like as main components. The links 44 and 44 are formed in the same shape, and one end side is mutually connected so that the 1st arm part 44a and the 2nd arm part 44b may cross | intersect diagonally, and it is formed in the L-shape. . And the connection part of the 1st and 2nd arm part (henceforth abbreviated as arm part) 44a, 44b is freely rotatable to the body 1 via the shaft 45 on one side (right side) in the longitudinal direction of the body 1. The arm portion 44a extends on the other side (left side) in the longitudinal direction of the body 1 and the arm portion 44b extends on the other side (lower side) in the lateral direction of the body 1 respectively. The arm portion 44a of the link 44 is formed with a long hole 44c extending along the extending direction of the arm portion 44a and into which the connecting shaft 43 pivotally attached to the protruding portion 7c of the handle 7 is loosely inserted. Of the side edges along the extending direction of the elongated hole 44c, the contact edge 6 is closed on the side edge (lower edge) far from the rotation center of the main body 7a (see FIGS. 6 and 7). The other side of the container 1 in the short direction is at a position closer to the off position where the connecting shaft 43 is located (right side) than the on position where the connecting shaft 43 is located (see FIGS. 1 and 2). A notch 44d that is recessed (lower side) is formed. The other arm portion 44b is formed with a round hole 44e through which a connecting shaft 48 for connecting the contact holder 46 and the movable contact 47 to the links 44, 44 is inserted. Here, the longitudinal direction of the container 1 means the left-right direction (left and right in FIG. 1), which is the arrangement direction of the power-side terminal portion 13 and the load-side terminal portion 14. Moreover, the short direction of the container 1 is a direction orthogonal to the longitudinal direction and the thickness direction (width direction), and means the up and down direction (up and down in FIG. 1) when the longitudinal direction is viewed as the left and right direction. Yes.

  The movable contact 47 is composed of halves 47a and 47b that are divided into two in the front-rear direction of the vessel body 1, and both halves 47a, 47b are formed in a symmetrical shape with respect to the intermediate surface in the front-rear direction. A shaft hole 47c through which the connecting shaft 48 is inserted is penetrated in the middle portion in the vertical direction of each half body 47a, 47b, and the movable contact 4 is integrally formed at the lower end thereof. On the other hand, a protruding piece 47d extends toward the left side at the upper end of the movable contact 47, and a riding-up portion 47e that protrudes while being bent obliquely upward to the right is formed at the upper edge of the protruding piece 47d. Yes. Both halves 47a and 47b are curved in a direction in which the lower sides of the shaft hole 47c are separated from each other. When the halves 47a and 47b are overlapped with each other, a space that can be formed into the curved portions will be described later. The engaging pin 36 is inserted.

  The contact holder 46 includes a central piece 46a having an insertion hole 46b through which a right end of a latch member 54, which will be described later, is inserted, and side pieces 46c that protrude rightward from both side edges in the front-rear direction of the central piece 46a. Each side piece 46c is formed with an insertion hole 46d through which the connecting shaft 48 is inserted. The contact pressure spring 49 that applies contact pressure to the contact portion 6 is formed in a shape in which one end sides of a pair of torsion coil springs are connected to each other. The contact portion abuts against the central piece 46a of the contact holder 46, and The other end side of the torsion coil spring is locked to the movable contact 47. Further, the body 1 is bent by the side piece 46 c in a state where the contact portion 6 is closed, and the opening that gives the contact holder 46 a restoring force in the direction in which the movable contact 4 separates from the fixed contact 5. A spring 51 is attached.

  The display member 52 is for displaying the on / off state of the contact portion 6, and as shown in FIG. 2, a cylindrical main portion 52a rotatably supported with the link 44 via the shaft 45, A display part 52b provided on the upper surface side of the part 52a, and an arcuate contact part 52c that protrudes from the right side of the main part 52a (the part on the other side in the longitudinal direction of the body 1) and has a distal end curved downward. ing. The display portion 52b has the highest amount of protrusion upward at the center in the left-right direction, and includes two display surfaces 52d and 52e that are inclined obliquely downward from the center to both sides. Here, the left display surface 52d is for off display, and the right display surface 52e is for on display, so that the on / off state can be discriminated by the colors, characters, etc. of the respective display surfaces 52d and 52e. The present contact state can be determined by exposing any display surface from the opening window 1b of the container 1. The display member 52 is urged in the OFF display direction (clockwise in FIG. 2) by a return spring 53 made of a torsion coil spring.

  Thus, the opening / closing mechanism 8 is formed in a shape in which the movable contact 47, the cylindrical spacer 50, and one end sides of a pair of torsion coil springs are connected to each other between both side pieces 46c of the contact holder 46. The contact pressure spring 49 and the pair of links 44, 44 are disposed, the insertion hole 46d of each side piece 46c, the center hole of the spacer 50, the center hole of the coil portion of the contact pressure spring 49, and the movable contactor By inserting the connecting shaft 48 through the shaft hole 47c of the 47 and the round hole 44e of the link 44, the link 44 and the movable contact 47 are pivotally attached to the contact holder 46 so as to be rotatable within a predetermined angle range. The In this manner, with the contact holder 46 holding the link 44 and the movable contact 47, the central portion of the link 44 is pivotally supported on the container body 1 by the shaft 45, and the length of the link 44 is further increased. The handle 7 and the contact holder 46 are connected via the link 44 by inserting the connecting shaft 43 through the hole 44 c and the insertion hole provided in the protrusion 7 c of the handle 7. In the contact pressure spring 49, a portion connecting the pair of torsion coil springs abuts on the central piece 46a of the contact holder 46, and the other end side of the torsion coil spring is locked to the center portion of the movable contact 47. When the movable contact 47 rotates clockwise around the connecting shaft 48, a spring return force in a direction to rotate the movable contact 47 counterclockwise is applied to the movable contact 47.

  Next, the forced opening mechanism unit 9 will be described. The forcible opening mechanism unit 9 includes a bimetal 22, an electromagnet device 28, a latch member 54, a tripping member 55, and the like as main components, and forces the contact unit 6 when an overcurrent exceeding the rated current flows through the contact unit 6. The thermal release function that opens the contacts and the electromagnetic force that forcibly opens the contact parts 6 when a large current such as a short-circuit current that is much larger than the current value at which the thermal release function operates flows. It has a release function.

  One end side (lower end) of the bimetal 22 is fixed to a left side piece of a U-shaped support plate 23 in which both lateral edges of the sheet metal are bent upward, and the other end side (upper end) is It is a free end. The right piece of the support plate 23 is connected to a vertical piece of a conductive L-shaped arc traveling plate 24 on which a horizontal piece is placed above the arc extinguishing grid 19. It arrange | positions in parallel with the horizontal piece of the traveling plate 24 with the clearance gap. A narrow protruding piece 23a protrudes upward from the upper edge of the left side piece of the support plate 23, and an adjusting screw 57 is disposed facing the protruding piece 23a.

  A partition wall 62 projects from the inner surface of the body 2 in the vicinity of the projecting piece 23 a, and a rectangular plate-like nut member 58 having a screw hole 58 a is fitted in the embedded groove 63 provided in the partition wall 62. The adjusting screw 57 is screwed into the screw hole 58 a of the nut member 58, and the screw portion of the adjusting screw 57 protruding from the right side surface of the nut member 58 faces the protruding piece 23 a through a communication groove provided in the partition wall 62. The screw portion of the adjustment screw 57 protruding from the left side surface of the nut member 58 is inserted into the communication groove 64 provided in the partition wall 62, and the tip thereof protrudes into the storage chamber of the load side terminal portion 14. Here, the square groove 2f on the left side surface of the body 2 is formed at the same height as the adjustment screw 57, and a tool such as a minus driver inserted through a tool insertion hole formed by the square groove 2f and the protruding piece 3f. The amount of screwing of the adjusting screw 57 can be adjusted by using. At this time, by pressing the protruding piece 23a with the tip of the adjusting screw 57, the protruding piece 23a is bent in the left-right direction, and the position of the upper end (free end) of the bimetal 22 can be moved in the left-right direction. By changing the relative positional relationship between the tripping member 22 and the tripping member 55, the current value when the bimetal 22 is bent and the forced opening mechanism portion 9 performs the trip operation, that is, the thermal release device operates. The current value can be adjusted before shipping. Since the adjusting screw 57, the nut member 58 and the tool insertion hole are arranged close to one side in the width direction of the vessel 1 (vertical direction in FIG. 3C), the tightening screw arranged at the center in the width direction The tool inserted from the tool insertion hole does not interfere with the screw 16.

  Further, as shown in FIGS. 2 and 3, the side surfaces of the body 2 and the cover 3 that face each other in the direction (front-rear direction) orthogonal to the advance / retreat direction (left-right direction) of the adjusting screw 57 and are parallel to the advance / retreat direction, respectively, Two adhesive injection holes 2g, 2h, 3g, and 3h formed in sizes corresponding to the adjustment screw 57 so that both side portions of the adjustment screw 57 projecting from both side surfaces of the nut member 58 can be visually recognized. It is penetrated one by one. On each side surface of the body 2 and the cover 3, the two adhesive injection holes 2g, 2h and the adhesive injection holes 3g, 3h are in a direction (vertical direction) orthogonal to the advancing / retreating direction of the adjusting screw 57. It is formed side by side.

  Here, after adjusting the screwing amount of the adjusting screw 57 to adjust the relative positional relationship between the bimetal 22 and the tripping member 55, the adhesive screw 57 is bonded from any one of the adhesive injection holes 2g, 2h, 3g, 3h. The adjustment screw 57 and the nut member 58 are bonded to each other by injecting an agent (not shown) to prevent the adjustment position of the adjustment screw 57 from changing. It is possible to individually inject the adhesive into the adjustment screw 57 projecting from both side surfaces of the nut member 58 through the agent injection holes 2g, 2h, 3g, 3h. Therefore, after the adjustment of the adjustment screw 57 is finished and an adhesive is attached to one surface of the nut member 58 to fix the adjustment screw 57, the adjustment screw 57 is forcibly rotated to peel off the adhesion state of the adjustment screw 57. When the position of the adjusting screw 57 is adjusted again, the adjusting screw 57 can be adhered and fixed by adhering an adhesive to the other surface of the nut member 58. Since the agent does not have to be attached, the adjustment screw 57 can be firmly bonded even when the bonding operation is performed again, and the adjustment position of the adjustment screw 57 can be reliably prevented from shifting.

  Further, two adhesive injection holes 2g, 2h and adhesive injection holes 3g, 3h are formed side by side in the direction perpendicular to the advancing / retreating direction of the adjusting screw 57 on each side surface of the body 2 and the cover 3. Therefore, after adjusting the fixing screw 57 by injecting the adhesive from the adhesive injection hole 2g or 2h or the adhesive injection hole 3g or 3h on each surface of the nut member 58, the adjustment screw 57 is fixed. When the adjustment screw 57 is peeled off by forcibly rotating and the position of the adjustment screw 57 is adjusted again, the adhesive is injected from another adhesive injection hole into which the adhesive has not been previously injected. Can do. Therefore, on each surface of the nut member 58, an adhesive can be newly attached to a portion of the adjusting screw 57 to which no adhesive is attached, and the adhesive is attached on the adhesive that has been previously attached. Since there is no need, the adjusting screw 57 can be firmly bonded even when the bonding operation is performed again in the same manner as described above.

  Further, in the present embodiment, adhesive injection holes 2g and 2h and adhesive injection holes 3g and 3h are formed on both side surfaces of the container 1 (that is, the side surfaces of the body 2 and the cover 3) facing each other in the front-rear direction. Therefore, after the adhesive screw is injected from the adhesive injection hole provided on one side surface (for example, the adhesive injection holes 2g, 2h of the body 2) and the adjustment screw 57 is bonded and fixed, the adjustment screw 57 is forcibly set. When the adjustment screw 57 is peeled off and the position of the adjustment screw 57 is adjusted again, the adhesive injection hole (for example, the adhesive injection holes 3g, 3h of the cover 3) is provided on the other side surface. By injecting the adhesive, the adhesive can be newly attached to the portion of the adjusting screw 57 to which the adhesive has not already been attached. Therefore, even when the adjustment operation is performed again and the adjustment screw 57 is bonded again, the adjustment screw 57 can be firmly bonded, and the adjustment position of the adjustment screw 57 can be reliably prevented from shifting.

  An electromagnet device 28 is placed on the central piece of the support plate 23. The electromagnet device 28 includes a coil 29 having one end connected to the free end of the bimetal 22 via the flexible wire 30 and the other end electrically connected to the movable contact 47 via the flexible wire 31. 29, a cylindrical coil frame 32 around which the coil 29 is wound, a movable iron core 33 that is movably disposed in the axial direction inside the coil frame 32, and an opening on one end side (the tripping member 55 side) of the coil frame 32. The fixed iron core 34 attached to the inner surface of the movable iron core 33, the resin spacer 38 attached to one surface of the movable iron core 33 (the surface on the side of the fixed iron core 34), and the movable iron core 33 and the fixed iron core 34 are interposed. A return spring 35 made of a coil spring that presses the movable iron core 33 in a direction away from the fixed iron core 34, and an opening on the right side of the coil frame 32 attached to the other surface of the movable iron core 33 (the surface opposite to the fixed iron core 34). Engaging pin protruding outward from 36, a drive pin 37 that is movably inserted into an insertion hole 34a that passes through the fixed iron core 34 in the axial direction, and a yoke 39 that covers both the left and right sides and the upper side of the coil 29 by bending both lateral edges downward. And. A slit 39a is formed in the yoke 39 from the right piece to the center piece, and the engagement pin 36 protrudes rightward through the slit 39a. A plate-like spring member 61 is disposed below the central piece of the yoke 39, and an elastic spring piece 61a formed by cutting and raising a part of the spring member 61 protrudes upward through the slit 39a. When the coil 29 is energized, an attractive force is generated between the movable iron core 33 and the fixed iron core 34 so as to reduce the magnetic resistance of the magnetic path passing through the fixed iron core 34 -the yoke 39 -the movable iron core 33. When a large current such as a short-circuit current flows in the main circuit, the movable iron core 33 moves toward the fixed iron core 34 against the spring force of the return spring 35 and is driven by the movable iron core 33. The pin 37 presses the protruding piece 23a of the tripping member 55 to the left and rotates the tripping member 55 clockwise about the shaft 59, thereby releasing the engagement of the latch member 54 and moving the movable core 33. The large-diameter portion 36a of the engaging pin 36 attached to the abutment contacts the movable contact 47, and rotates the movable contact 47 clockwise about the connecting shaft 48.

  The latch member 54 is an iron (SPCC) part and is formed in a long and narrow bar shape, and an intermediate portion in the longitudinal direction is pivotally supported on the container body 1 via a shaft 56. Further, a concave groove 54a that engages with the contact holder 46 is formed on the upper edge of the latch member 54 on one end side (right side) in the longitudinal direction. A protruding portion 54b is formed so as to protrude from the surface. On the other hand, a latching projection 54 c that latches with the tripping member 55 is provided on the other end side (left side) in the longitudinal direction of the latch member 54.

  The tripping member 55 includes a main body portion 55a that is pivotally supported on the container body 1 via a shaft 59, and an extending piece that protrudes downward from the main body portion 55a and has a distal end portion opposed to the drive pin 37. 55b, and a locking portion 55c that locks with the locking projection 54c of the latch member 54 is provided on the lower edge of the main body 55a. The tripping member 55 is biased counterclockwise about the shaft 59 by the return spring 60, and the contact portion 6 is opened by locking the locking portion 55c with the locking projection 54c of the latch member 54. The latch member 54 is latched in a state where the direction force is stored. Thus, when an overcurrent flows through the energization circuit, the free end of the bimetal 22 pushes the tripping member 55 in the unlocking direction to release the latching state between the latch member 54 and the tripping member 55. Then, the forced opening mechanism unit 9 forcibly opens the contact part 6 by the force accumulated at the normal time when no overcurrent flows through the contact part 6 in the closed state.

  Next, the operation of the circuit breaker will be described with reference to FIGS. 1 to 3 show the open state (off state) of the contact portion 6, and the handle 7 receives the spring force of the handle return spring 41 until the operation portion 7b contacts the left end of the opening 1a. It rotates counterclockwise in the figure. Further, the connecting shaft 43 that connects the handle 7 and the link 44 moves to the right end (off position) in the elongated hole 44c provided in the arm portion 44a, and rotates freely on the arm portion 44b according to the rotation of the link 44. The supported movable contact 47 moves to the left in the figure, and the movable contact 4 of the movable contact 47 is separated from the fixed contact 5. That is, the power supply side terminal portion 13 and the load side terminal portion 14 are in a non-conductive state (off state). In the off state, the riding-up portion 47 e provided on the upper end side of the movable contact 47 is in contact with the vicinity of the base of the contact portion 52 c provided on the display member 52, and the display member 52 is caused by the spring force of the return spring 53. Since it rotates clockwise in the figure, the display surface 52d on the left side is exposed from the opening window 1b of the container 1, and the OFF state is displayed.

  From this OFF state, when the operation knob 42 is operated to rotate the handle 7 clockwise in the figure against the spring force of the handle return spring 41, the connecting shaft 43 provided on the protruding portion 7c of the handle 7 becomes a long hole. 44c moves to the left, and the lower edge of the long hole 44c is pressed downward by the connecting shaft 43, so the link 44 rotates counterclockwise around the shaft 45 and is movable as the link 44 rotates. The contact 47 moves to the right side in the figure. 3 and 4, when the operation portion 7b of the handle 7 moves to a substantially intermediate position between the off position and the on position, the movable contact 47 moves to a position where the movable contact 4 contacts the fixed contact 5. To do. Here, while the handle 7 is rotated from the off position shown in FIGS. 1 and 2 to the position shown in FIGS. 3 and 4, the movable contact 4 is not in contact with the fixed contact 5, and the contact pressure by the contact pressure spring 49. Therefore, the handle 7 can be operated with a small force.

  Thereafter, as shown in FIGS. 6 and 7, the operation knob 42 is pushed rightward in the drawing against the spring force of the handle return spring 41 and the contact pressure spring 49 until the operation portion 7b comes into contact with the right end of the opening 1a. When the handle 7 is rotated clockwise in the drawing, the connecting shaft 43 moves to the left end (on position) in the long hole 44c, and the link 44 rotates clockwise in the drawing according to the movement of the connecting shaft 43. The contact holder 46 supported by the arm portion 44b of the link 44 moves to the right side in the figure. During this time, the movable contact 4 provided on one end side of the movable contact 47 is in contact with the fixed contact 5, so that the movable contact 47 rotates clockwise in the figure around the connecting shaft 48, and the contact pressure is accordingly increased. Since the spring 49 is bent, the movable contact 4 is pressed against the fixed contact 5 by the spring return force of the contact pressure spring 49. That is, contact pressure is applied to the contact portion 6 by the contact pressure spring 49. In this state, the power supply side terminal portion 13 and the load side terminal portion 14 are in a conductive state (ON state). Further, when the handle 7 is rotated from the contact start position of the contact portion 6 shown in FIGS. 4 and 5 to the on position shown in FIGS. 7 and 8, the ride-up portion 47e provided on the upper end side of the movable contact 47 is used as a display member. 52, the main part 52a rotates counterclockwise in the figure against the urging force of the return spring 53. As shown in FIG. In the ON position, the lower end of the contact portion 52c is in a state of riding on the top of the riding portion 47e, and the display surface 52e for ON display moves to a position facing the opening window 1b. The ON state of the part 6 can be easily grasped. When the handle 7 is rotated to the ON position, the connecting shaft 43 that connects the handle 7 and the link 44 moves to the opposite side (the left side in FIG. 6) beyond the line connecting the handle shaft 40 and the shaft 48. Therefore, a spring force such as the opening spring 51 acts in a direction to urge the handle 7 in the ON direction, and the handle 7 is held in the ON position.

  When the operation knob 42 is operated from the on state shown in FIGS. 6 and 7 to rotate the handle 7 in the off direction (counterclockwise in the figure), the connecting shaft 43 provided on the protruding portion 7c of the handle 7 becomes a long hole. 44c moves to the right in the figure, and the link 44 rotates clockwise in the figure. Therefore, the movable contact 47 supported by the contact holder 46 together with the link 44 moves to the left in the figure, and the movable contact 4 is fixed to the fixed contact 5. Break away from. When the connecting shaft 43 that connects the handle 7 and the link 44 moves to the opposite side (the right side in FIG. 1) beyond the line connecting the handle shaft 40 and the shaft 48, the spring force of the handle return spring 41 is reached. In response to this, the handle 7 rapidly rotates in the off direction, and the off state shown in FIGS. 1 and 2 is established, and the handle 7 is held in the off position. At this time, the riding-up portion 47e of the movable contactor 47 moves to the left side in the figure while being in sliding contact with the lower inclined surface of the contact portion 52c, so that the display member 52 receives the return force of the return spring 53 in the drawing. The display surface 52d for off display is exposed from the opening window 1b at the off position shown in FIGS. 1 and 2 by rotating clockwise.

  As described above, when the operation portion 7b (operation knob 42) of the handle 7 is operated to rotate the main body portion 7a, the connecting shaft 43 pivotally supported by the protruding portion 7c extends to the other side in the longitudinal direction of the body 1. The second arm portion 44b extending to the other side in the short direction of the body 1 is moved through the long hole 44c provided in the first arm portion 44a to be extended, and the connecting portion of both arm portions 44a and 44b. (That is, the shaft 45 is rotated as a fulcrum, and the movable contact 47 supported by the arm portion 44b is moved in accordance with the rotation of the link 44, and the contact portion 6 is brought into contact with and separated from. Therefore, even when the main body portion 7a rotates in accordance with the operation of the operation portion 7b, the arm portion 44b itself extending to the other side in the short direction of the container body 1 moves to the other side in the short direction of the device body 1. In other words, it is not necessary to provide an empty space for moving the link 44 in the short direction of the container 1, so that the short dimension, that is, the height dimension of the container 1 can be reduced.

  The side edge (lower edge) along the extending direction of the elongated hole 44c is closer to the off position where the connecting shaft 48 exists in the off state than the on position where the connecting shaft 48 exists in the on state. Since the notched portion 44d that is recessed downward is formed, when the handle 7 is turned on, the operation of rotating the link 44 according to the rotation of the main body portion 7a is compared with the case where the notched portion 44d is not formed. Can be delayed. Therefore, the movable contact 4 provided on the movable contact 47 starts to come into contact with the fixed contact 5 when the operation portion 7b (operation knob 42) of the handle 7 is closer to the ON position, and the contact pressure of the contact portion 6 is reduced. The handle 7 is easily turned on by bringing the position of the operation portion 7b (operation knob 42) closer to the on position.

  Next, the operation of the forced opening mechanism 9 when an abnormal current flows through the contact 6 will be described. When a large current such as a short circuit current flows through the contact portion 6 due to a short circuit accident in the ON state shown in FIGS. 6 and 7, a large current flows through the coil 29, and the movable iron core 33 and the fixed iron core 34. The movable iron core 33 moves in a direction approaching the fixed iron core 34 against the spring force of the return spring 35 (see FIGS. 8 and 9). At this time, the drive pin 37 pushed by the movable iron core 33 protrudes to the left side through the insertion hole 34a of the fixed iron core 34 and presses the protruding piece 23a of the releasing member 55 leftward. By rotating clockwise in the figure in the center, the engagement state between the tripping member 55 and the latch member 54 is released. When the engagement between the tripping member 55 and the latch member 54 is released, the latch member 54 receives the spring force of the elastic spring piece 29a, rotates clockwise about the shaft 56, and contacts the concave groove 54a of the latch member 54. Since the engagement with the center piece 46a of the child holder 46 is disengaged, the contact holder 46 rotates clockwise around the connecting shaft 48 in response to the spring force of the contact pressure spring 49 or the opening spring 51, and movable contact is also possible. The child 47 rotates clockwise in the figure, and the movable contact 4 is separated from the fixed contact 5. In addition, the engaging pin 36 moves to the left in the drawing together with the movable iron core 33, and the lower end side of the movable contact 47 is pressed to the left by the large diameter portion 36a of the engaging pin 36. It is possible to prevent the occurrence of contact welding by tripping over time. 8 and 9 show a state immediately after the forcible opening mechanism portion 9 performs electromagnetic release operation and forcibly opens the contact portion 6, and then the spring force of the handle return spring 41, the return spring 60, etc. is applied. In response, the opening / closing mechanism 8 and the forced opening mechanism 9 return to the OFF state shown in FIGS. 1 and 2, so that the contact 6 can be closed again by turning on the handle 7 after recovery. .

  6 and FIG. 7, when an overcurrent exceeding the rated current flows in the contact portion 6 in the ON state (the operation current of the thermal release function), the bimetal 22 is bent and tripped on the upper end side of the bimetal 22. Since the upper portion of the member 55 is pressed rightward, the tripping member 55 rotates clockwise about the shaft 59, and the engagement between the tripping member 55 and the latch member 54 is released. At this time, the latch member 54 receives the spring force of the elastic spring piece 29a, rotates clockwise around the shaft 56, and the engagement between the concave groove 54a of the latch member 54 and the central piece 46a of the contact holder 46 is released. Therefore, the contact holder 46 is rotated clockwise around the connecting shaft 48 in response to the spring force of the contact pressure spring 49 and the opening spring 51, and the movable contact 47 is rotated clockwise in the figure, thereby moving the movable contact. 4 is released from the fixed contact 5. Even when the forcible opening mechanism 9 performs the thermal release operation to forcibly open the contact 6, the opening / closing mechanism 8 and the return force receiving spring force such as the handle return spring 41 and the return spring 60 are received in the same manner as described above. Since the forced opening mechanism portion 9 returns to the off state shown in FIGS. 1 and 2, the contact portion 6 can be closed again by turning on the handle 7 after recovery.

  It should be noted that a wide variety of different embodiments can be configured without departing from the spirit and scope of the present invention, and the present invention is not limited to a specific embodiment.

It is a disassembled perspective view of the circuit breaker of this embodiment. The off state is shown, (a) is a front view, (b) is a rear view, and (c) is a top view. (A) is the principal part enlarged view of the body which comprises the same as the above, (b) is the principal part enlarged view of the cover which comprises the same as the above. It is a side view of the state which showed the off state same as the above and removed the cover. It is a side view of the state which showed the off state same as the above and removed the cover and the link. It is the side view of the state which showed the state in the middle of switching from OFF to ON same as the above, and removed the cover. It is the side view of the state which shows the state in the middle of switching from OFF to ON same as the above, and has removed the cover and the link. It is a side view of the state which showed the ON state same as the above and removed the cover. It is a side view of the state which showed the ON state same as the above and which removed the cover and the link. It is a side view of the state which showed the trip state same as the above and removed the cover. It is a side view of the state which showed the trip state same as the above and which removed the cover and the link.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body 2 Body 3 Cover 2g, 2h Adhesive injection hole 3g, 3h Adhesive injection hole 4 Movable contact 5 Fixed contact 6 Contact part 22 Bimetal 54 Latch member 55 Tripping member 57 Adjustment screw 58 Nut member

Claims (3)

  The contact part inserted into the current path between the power source and the load inside the body, and the force to open the contact part in normal time when the contact part is closed and no overcurrent flows through the contact part A release member that forcibly opens the contact portion by the force accumulated during normal operation when the latch member is released and the latch member is released, and one end side as a fixed end. The end side is a free end, and when the overcurrent flows through the energizing circuit, the free end pulls it off and changes the relative positional relationship between the bimetal that pushes the member in the unlocking direction and the bimetal and the tripping member. An adjustment screw and a nut member through which a screw hole into which the adjustment screw is screwed are housed, and the adjustment screw protruding from both side surfaces of the nut member on the side surface of the container parallel to the advancing and retreating direction of the adjustment screw. Adhesive injection hole of a size that can be seen on both sides Circuit breaker, characterized in that it is provided.   2. The circuit breaker according to claim 1, wherein a plurality of the adhesive injection holes are formed side by side in a direction orthogonal to the advancing / retreating direction of the adjusting screw on the side surface of the container body. 3. The circuit breaker according to claim 1, wherein the adhesive injection holes are formed on both side surfaces of the container body facing each other in a direction orthogonal to the advancing / retreating direction of the adjusting screw. .

Images