JPS6119481Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to circuits and disconnectors.

The circuit breaker which is the basis of this invention is shown in Figures 1 to 11 (details will be given after the explanation of this invention).The movable contact 1 of this circuit breaker
The contact pressure of the fixed contact 36 and the trip lever 22 when closed is determined by turning the handle 21 on, rotating the link 26, and pushing down the second movable shaft 29, as shown in FIG. , the movable contact portion including the movable frame 24 and the movable contactor 15 is operated to close by the contact pressure spring 28, and the contacts 16 and 36 are brought into contact with each other;
Furthermore, when the movable shaft 29 is pushed down, the contact pressure spring 28 is deflected and contact pressure is applied.
On the other hand, in the handle 21, the first movable shaft 27 is connected to the support shaft 2.
01 and the second movable shaft 29, the movable contact 15 is reversely biased and locked to the stopper portion 20m of the frame 20, and the movable contact 15 also maintains the closed state with contact pressure applied. becomes.

However, this circuit breaker is not suitable for the support shaft 201 and the second movable shaft 29 due to variations in the size and shape of the frame that forms the stopper portion 20m and the slit 20e that restricts the movement of the second movable shaft 29.
The opening angle between the plane containing the first movable shaft 27 and the second movable shaft 29 changes, and as a result, the position of the second movable shaft 29 in the on state varies, resulting in a change in contact pressure. There is a problem that variations occur, and as a solution to this problem, it is required to improve frame accuracy.

Therefore, the purpose of this invention is to provide a circuit and a disconnector that can adjust the variation in contact pressure and stabilize it by providing a precision margin for the parts.

The first embodiment of this invention is shown in FIG.
Shown in Figure 3. That is, in the circuit breakers shown in FIGS. 1 to 11, a groove 20m' is formed in the stopper part 20m of the frame 20, and a jig such as a driver is inserted into the groove 20m'. The position of the stopper portion 20m is set by deforming it.

Because of this configuration, as shown in FIG.
The angle θ is adjusted to a constant value using a jig,
Therefore, variations in the contact pressure can be absorbed, the contact pressure can be stabilized, and uneven contact of the first movable shaft 27 can be eliminated, so that there is a margin in the accuracy of the frame.

A second embodiment of this invention is shown in FIG. That is, this circuit breaker has a slit-shaped plastic deformation groove 20 m'' having a driver insertion width formed inside the stopper part 20 m of the frame 20, and the other features are the same as in the first embodiment. It is.

As described above, the circuit breaker of this invention includes a handle 21 having a first movable shaft 27, a frame 20 that rotatably supports this handle 21 by a support shaft 20l, and a structure formed on this frame 20. a stopper portion 20m that the first movable shaft 27 comes into contact with when the handle 21 is in the on-operation position; a groove 20m′ provided in the frame 20 to move the position of the stopper portion 20m by plastic deformation;
20 m'' and a link 2 having one end connected to the first movable shaft 27 and a second movable shaft 29 at the other end.
6, a guide slit 20e formed in the frame 20 and linearly guiding the second movable shaft 29, and one end connected to the second movable shaft 29 and the other end engaged with the tripping plate 23. It is provided with a trip lever 22 that is stopped and a movable contact portion (15, 24) that is pressed by the trip lever 22 to close the pole. Therefore, there is an effect that variations in contact pressure can be adjusted and stabilized while maintaining a precision margin for parts, particularly the frame.

The circuits and circuit breakers that form the basis of this invention are shown in Figures 1 to 11. That is, the configuration and operation of this circuit breaker will be explained item by item as follows.

() Structure This circuit breaker is a two-pole type with a common mechanism, and can be divided into three blocks in addition to the base and cover for assembly purposes.

(a) Base and cover (Figures 1 to 3)
(Fig. 9) The base 1 is molded into a rectangular shape using a molding material, and on the front side there is a frame installation groove 1a (third groove) in the center.
) and a long groove 1b extending to both ends in the longitudinal direction on both sides with the frame installation groove 1a in between.
(Fig. 2) is formed, and a recess 1c (Figs. 2 and 3) for attaching the back plate is formed on the back side. As shown in Fig. 3, the frame installation groove 1a is formed with a mounting hole 1d at the bottom through which a recess 1c passes, and the power supply side side wall 1e of the installation groove 1a protrudes upward and is vertically located at the center of the groove inner wall for ventilation and link escape. A slit 1f is formed, a cover guide slit 1g is tapered on the outer surface of the side wall 1e,
Further, as shown in FIG. 1, a movable shaft guide wall 1h is formed extending from both ends of the side wall 1e in parallel with the side wall at the same height as the side wall 1e, and a cover positioning protrusion 1i is formed on the upper end surface of the side wall 1e. ing. Furthermore, as shown in FIGS. 1 and 3, a cover mounting hole 1j is formed inside at the center of both ends of the base 1, a guide protrusion 1k is formed on the outside, a cutter mounting hole 11 is formed, and the frame Installation groove 1a
A pair of first block mounting slits 1m are installed at predetermined positions between the cover mounting hole 1j on the load side and the cover mounting hole 1j on the load side.
(only one side shown) (recess 1
c).

As shown in Figs. 1 and 2 (the other long groove is omitted as it is the same), the long groove 1b has an opening 1n on both end faces as a wire connection port, and a pair of ribs 1o and 1p are formed inside the opening 1n to connect the load. Forming a side terminal container part 1q and a power supply side terminal container part 1r,
Furthermore, a partition rib 1s is formed in the center of the long groove 1b, and the side of the partition rib 1s on the side of the container 1q is used as the first block container 1t, and a bimetal adjustment hole 1u is formed in the bottom of the partition rib 1s. Third
A block receptacle 1v is formed in the receptacle 1v with a mounting slit 1w penetrating into a recess 1c on the back surface of the base 1. Further, as shown in FIG. 1, cover positioning protrusions 1x are formed on the surfaces of both sides of the base 1 along the long grooves 1b.

The cover 2 is formed of a molding material to have the same vertical and horizontal dimensions as the base 1, as shown in FIGS. 1 to 4, and is made to cover the surface of the base 1.
The center part 2a has a predetermined height and has a ventilation/handle hole 2b formed in the center thereof, and a cover mounting hole 2c and a guide protrusion 1k of the base 1 are formed in the center of both ends as shown in FIGS. 1 and 3. A notch 2d to be fitted is formed, and a driver insertion hole 2e is formed on both sides of both ends as shown in FIGS. 1 and 2, and a ventilation slit 2e' is formed on the inner surface of the hole 2e. , the lower edge of the hole 2e and the terminal holder 2e''.On the other hand, on the inside of the cover 2, as shown in FIG.
A side wall 2g that faces the side wall 1e of the base 1 and fits into the cover positioning protrusion 1i on the upper surface of the side wall 1e is formed, and the side wall 2g has a slit 2h that is continuous with the ventilation/link escape slit 1f of the base 1. A cover guide rib 2i is formed which extends from the lower surface of the side wall 2g to the lower surface of the cover 2 in correspondence with the cover guide slit 1g. Further, as shown in FIG. 2, an arc extinguishing grit holding rib 2j having a height for forming an exhaust passage is formed at a position facing the third block container 1v of the base 1 on the back surface of the central portion 2a, and An arc gas exhaust passage forming slit 21 is formed in the side wall 2k, and a notch 2m cuts out the side of the power supply side driver insertion hole 2e that communicates with the slit 21, and the inner peripheral surface of the insertion hole 2e communicates with the notch 2m. A slit 2n facing the hole entrance is formed. .

To connect the base 1 and the cover 2, place the cover 2 on the surface of the base 1 as shown in FIG.
i and the guide slit 1g, fit the bottom surface of the side wall of the cover 2 to the cover positioning protrusion 1x, pass the tip of the pin 3 through the mounting hole 2c of the cover 2 through the mounting hole 1j of the base 1, and then Caulk the tip to cover 2 with a jig. Further, after the block is installed on the base 1, the back plate 4 is bonded to the back concave portion 1c of the base 1.

(b) The first block (Fig. 1, Fig. 2, Fig. 9)
(Fig. 10) The first block A mainly integrates a tripping element and a movable contact. That is,
As shown in FIG. 10, the yoke 5 is formed by bending a plate-like body into an inverted U shape, and has a plunger cylinder mounting hole 5b drilled in its upper piece 5a, and a positioning projection on the outer surface of one side piece 5c. 5d protrudes, and a pair of arc running plate holding pieces 5e extend from both sides thereof, and a fixing plate recess 5g is cut out at the tip of the other side piece 5f to form caulking legs 5h. . The plunger cylindrical body 6, which constitutes one of the tripping elements, is open at the bottom and forms a small-diameter mounting cylinder 6a at the top, and a plunger (movable iron core) 7 is slidably inserted into the cylinder from the bottom opening. Tripping plate operating collar 7a from 6a
The body portion 7 is formed by protruding the thin shaft tip portion 7b having a
c to the inner surface of the upper part of the cylinder body 6 (see FIG. 2), and then pass the return coil spring 8 to the rear end part 7d of the thin shaft facing the lower opening of the cylinder body 6, and its tip end to the rear end of the body part 7c. The fixed core 9, which has an insertion hole 9a through which the thin shaft rear end 7d is inserted, is fixed to the lower opening of the cylindrical body 6. A small-diameter caulking cylinder portion 9b is formed on the lower surface of the fixed iron core 9. Further, a coil 10 is wound around the outer surface of the cylindrical body 6, and a load-side terminal plate 10a is welded to the lower end of the coil 10.

The fixing plate 11 has one end of a plate-shaped body folded downward to form a bimetal fixing vertical piece 11a and a horizontal folded piece 11b (see Fig. 2), and a fixed core mounting hole 11d is formed in the central piece 11c.
, and a notch 11e is formed at the other end to form a yoke fixing caulking leg 11f.
1c, a notch 11g is formed on both sides of the adjacent end of the vertical piece 11a, a hole 11a' is formed in the bent part of the vertical piece to make it easier to bend, and a screw hole 11h is formed in the horizontal folded piece 11b. form,
Furthermore, a mounting piece 11i is attached to one side of the center piece 11c.
is made to hang down, and a fork-shaped caulking leg 11j is formed at the tip thereof.

The yoke 5 and the fixing plate 11 are arranged so that the center piece 11c of the fixing plate 11 faces the lower opening position of the yoke 5, and the mounting cylinder part 6a of the cylinder 6 is inserted into the mounting hole 5b of the upper piece 5a of the yoke 5 from below. Fit the caulking cylinder part 9b of the fixed core 9 into the mounting hole 11d of the fixed plate 11 from above, and clamp the cylinder 6 around which the coil 10 is wound between the yoke 5 and the fixed plate 11. The caulking leg 11f is attached to the tip of the one side piece 5c, and the caulking leg 5h of the yoke 5 is attached to the notch 11g of the fixing plate 11.
At the same time, the cylindrical portion 9b of the fixed iron core 9 is caulked and fixed to the edge of the mounting hole 11d.

The arc traveling plate 12 is a plate-shaped body bent in a Z-shape and arranged vertically to form arc extinguishing grid support steps 12b on both sides of the upper end of the upper vertical piece 12a, and the upper vertical piece 12a and the horizontal piece 12c are folded. The bent portion is bent diagonally downward to form an arc transition portion 12d, and the lower vertical piece 12e has a positioning hole 12f, and a movable contact support piece 12g extends downward from both sides, and an end portion of the support piece 12g is provided with a positioning hole 12f. The supporting shafts 12h for movable contacts facing each other are pressed and protruded from the outer surface. This arc traveling plate 12 has a positioning hole 12f fitted into a positioning protrusion 5d of one side piece 5c of the yoke 5, and a lower vertical piece 12e of the one side piece 5c of the yoke 5 is fitted into the positioning hole 12f.
c, the holding piece 5e is bent and the lower vertical piece 12e is caulked into a holding state. In this state, the support shaft 12h is attached to the fixed plate 1 as shown in FIG.
Located at the bottom of 1.

The bimetal 13 has a predetermined height, has a middle part 13a bent in the width direction to ensure insulation with respect to the frame 20, has a lower end 13b welded to the vertical piece 11a of the fixed plate 11, and has a screw hole in the horizontal folded piece 11b. Adjustment screw 1 on 11h
4 (Fig. 2), and the horizontal folding piece 11b is pushed down by the reaction force of pressing the tip of the adjustment screw 14 against the back surface of the center piece 11c, and the vertical piece 11 is pushed down.
The tip 13c of the bimetal 13 is positioned at its initial operating position by tilting the tip 13c at the bent portion having the hole 11a'.

The movable contactor 15 is formed by slightly bending a plate-shaped body at a position slightly closer to the rear end of the middle part so that the tip side is curved, and pressing both sides of the middle part from the lower surface to form a semicircular arc-shaped bearing. 15a, a return spring support protrusion 15b is provided on the upper surface of the rear end by pressing from the lower surface, and an arc transition protrusion 15 is provided on the lower surface of the tip by pressing from the upper surface.
c is provided in a protruding manner, and a movable contact 16 is fixed adjacent to the arc transition protrusion 15c. Further, a tapered movable frame abutting protrusion 15d is formed by pressing from the lower surface slightly toward the middle portion from the tip end and is raised toward the rear end portion. The movable contactor 15 is fitted with the bearing 15a facing the support shaft 12h of the arc travel plate 12, with the support pieces 12g being bent to expand. In addition, the support protrusion 15b at the rear end of the movable contactor 15 and the fixed plate 11
The return spring 11 is between the lower surface of the central piece 11c of the
compress and intervene. This return spring 17 is an inverted conical coil spring, and its lower end small diameter portion 17a fits into the support protrusion 15b, and its upper end large diameter portion 17b.
is centered on the insertion hole 9a of the cylindrical portion 9b of the fixed iron core 9, and inserts the thin shaft rear end 7 of the plunger 7.
d passes through the center of the spring 17 and the support protrusion 15b
You can press . Further, due to the action of the return spring 17, the top surface of the tip end of the movable contact 15 is supported by coming into contact with the protruding surface of the arc transition portion 12d of the arc traveling plate 12 (after the base is installed, it is supported by the movable frame).

Next, in order to form an electric path, as shown in FIG.
b is welded between the upper end of the bimetal 13 and the upper end of the coil 10, and the copper stranded wire 18c
the lower end of the bimetal 13 and the movable contact 15
Welded between the lower surface of the rear end and the load side terminal plate 10a, the coil 10, the copper stranded wire 18b,
An electric path is formed between the bimetal 13, the copper stranded wire 18c, and the movable contact 15, and at the same time, the movable contact 15 is connected to the arc traveling plate 1 via the yoke 5, etc.
2 are kept at the same potential.

The load side connection terminal 19 is a terminal frame 1 formed by bending a plate-like body into a rectangular tube shape and dovetailing it as shown in Fig. 10.
A screw hole 19b is formed in the upper surface of the terminal frame 19a, and a dowel 19c is inserted through one opening of the terminal frame 19a, and a load-side terminal plate 10a is inserted into the dowel 19c from the other opening on the lower surface of the terminal screw 19.
d, and its tip touches the upper surface of the stopper 19c. The wires to be connected are terminal frame 1.
It is inserted between the stopper 19c and the terminal plate 10a through the one opening of the terminal plate 9a and compressed with the screw 19d.

Now, the first block A constructed and assembled in this manner takes the form as shown in FIG. 2 and is housed in the container 1t of the base 1. That is, the mounting piece 11i provided on the fixed plate 11 is passed through the mounting slit 1m, and the fork-shaped caulking legs 11j are swaged from the back side of the base 1 in an open leg shape to fix it in the mounting slit 1m, and at the same time, the load side connection terminal 19 is When positioned in the terminal receptacle 1q,
The tip of the movable contact 15 faces onto the third block receptacle 1n of the base 1, and the head of the adjustment screw 14 faces the adjustment hole 1u of the base 1 to adjust the position of the bimetal 13 from the back side of the base 1. It becomes possible. Also, by attaching the cover 2 to the base 1 in this state, the upper edge corner of the terminal frame 19a of the terminal 19 can be attached to the cover 2.
The presser foot 2e'' presses and fixes the terminal 19.

(c) Second block (Fig. 3, Fig. 4, Fig. 8)
(Fig. 9) The second block B is a shared mechanical part that breaks the electric circuit between the two left and right poles, and as shown in Fig. 8, it mainly consists of a frame 20, a handle 21, a trip lever 22, a trip plate 23, and a movable contact. It is composed of a movable frame 24 that drives the child. As shown in FIG. 8, the frame 20 is made by bending a plate into a U-shape.
A mounting screw hole 20a (Fig. 3) is formed in the center of the bottom, and a vertical slit 20d for inserting the movable frame is formed approximately in the center of both side pieces 20b, 20c, and one end of both side pieces 20b, 20c is formed beyond the vertical slit 20d. Both side pieces 20b, 20 are slightly inclined to the side.
Movable shaft guide slit 2 opening at the upper edge of c
0e, and a handle support piece 20f extending vertically upward from the vertical slit 20d on the other end side of both side pieces 20b, 20c, and a tripping plate support plate 20g extending horizontally outward; The edge of the inner surface of the upper end of the handle support piece 20f is expanded into an arc shape to form a disc shape 20f', and a bearing hole 20h is formed at the tip of the trip plate support piece 20g. A spring support protrusion 20i is formed on the upper surface of the base, and a trip plate positioning protrusion 2 is formed on the lower surface of the tip.
0j, and a handle support piece 20f
A handle stopper/spring support protrusion 20k is formed on the side at an intermediate height position, and a support shaft 20l is formed by pressing the inner surface of the upper end portion from the outer surface,
The base of the support piece 20f is connected to the movable shaft stopper part 2.
It is set to 0m.

The handle 21 is formed of an insulating material into a substantially inverted Y shape as shown in FIG.
1a, one of the individual installation parts is a link connecting protrusion 21b, the other is a reset operation protruding part 21c, and a bearing hole 21 is provided in the central connecting part of the three.
d, and the lower half of both protrusions 21b and 21c, including the bearing hole 21d, is narrowed to form a step 21.
A protrusion 24f for ensuring wall thickness is formed on one side of the link connecting protrusion 21b, leaving a groove 21g, and a shaft hole 21h and a thin hole 21h penetrating through the protrusion 21f are formed in the center. A link insertion slit 21i is formed to separate the bearing hole, and a spring support cylindrical portion 21j is formed in the bearing hole 21d. This handle 21 is a spring support tube 2
Return spring 2 made of torsion coil spring 1j
5 through the coil hole, the bearing hole 21d is exposed to the upper end of the handle support piece 20f of the frame 20, the support piece 20f is slightly bent into an open state, and its support shaft 20l is inserted into the bearing hole 21d. The return spring 25 is prevented from coming out by the support piece 20f, one end of the return spring 25 is passed through the groove 21g along the step 21e, and the other end is twisted and biased into the spring support protrusion 20k.
The handle 21 is rotated in the direction of turning off as shown in FIG. be done.

As shown in FIG. 8, the link 26 is a dogleg-shaped flat plate with shaft holes 26a and 26b formed at both ends.The upper end of the link 26 is passed through the slit 21i of the handle 21, and the shaft holes 26a and 21h are aligned. By inserting and connecting the first movable shaft 27 having the length of the outer dimension width (simply by inserting it), and rotating the handle 21 using the spring force of the spring 25, the first movable shaft 27 Both ends of the frame 20 are the stopper parts 2 of the frame 20.
By locking at 0 m, the on-state posture positioning of the handle 21 is configured.

The trip lever 22 is a rectangular plate-shaped body having a width smaller than the inner width of the frame 20 as shown in FIG. The bearing piece 22b is installed vertically, and the shaft hole 22c is formed in the bearing piece 22b.
A link insertion slit 22d is formed at the center of the edge of the other end. One end of the contact pressure spring 28 is welded to the lower surface of the one end of the trip lever 22, and the contact pressure spring 28
is further formed of a narrow leaf spring, the other end is formed to such an extent that it protrudes between the bearing pieces 22b of the trip lever 22, and a link insertion slit 28a is formed at its rear edge.

The link 26, the trip lever 22, and the contact pressure spring 28 are assembled in the guide slit 20e of the frame 20 by a second movable shaft 29 having a length equal to the outer width of the frame 20. That is, the link 26 is connected to the first movable shaft 2.
7 as a fulcrum and its shaft hole 26b is positioned in the movable shaft guide slit 20e of the frame 20, and the link insertion slit 2 of the contact pressure spring 28 is rotated.
Pass the edge of the slit 26b of the link 26 through the link 26, flexibly urge it to approach the contact pressure spring 28 and the trip lever side, align the slit 26b and the shaft hole 22c, and insert one of the slits 20e of the frame 20. The second movable shaft 29 is inserted into the shaft hole 2.
6b, 22c with a slit 20 at the shaft end.
contact pressure spring 28.
An end portion of the slit 28a is elastically supported on the surface of the second movable shaft 29, and the pressure thereof restricts the axial movement of the movable shaft 29.

Further, as shown in FIG. 8, the tripping plate 23 is formed of an insulating molding material into a substantially rectangular plate shape having a window hole 23a for ventilation and trip lever escape at the center, and the upper piece 23b has both ends extending outward. A bimetallic pressure-sensitive protrusion 23c is formed on the side opposite to the frame 20 at the end of the protrusion, and the upper piece 23b
A spring support portion 23d is cut out at the corner of the window hole, and support protrusions 2 are formed on the window hole forming surface of both side pieces 23e.
3f are provided oppositely protrudingly, and the frame-opposing surfaces of both side pieces 23e extend in a chevron shape to form a plunger pressure-sensitive projecting portion 23h laterally outward from the extending portion 23g.
A pair of plunger pressure sensing protrusions 23i and 23j are respectively formed on the side surface of the protruding portion 23h facing the link frame.
A plunger insertion portion 23k is formed between 23j, and a triple lever guide taper 23m is formed by extending the lower end 23l of the tripping plate 23 downward and having a thin hole edge on the window hole side of the side surface facing the frame. , a trip lever latch engagement step portion 23n is formed on the lower surface of the lower end. This tripping plate 23 has a window hole 23a located in the tripping plate support piece 20g of the frame 20,
Slightly bend the support piece 20g in the closed state to fit the support shaft protrusion 23f into the bearing hole 20h (details in Figure 4), and then insert the intermediate part of the flexible linear spring 30 into the support shaft protrusion between the support piece 20g and the support piece 20g. 23
One end is connected to the support part 23 of the upper corner of the window hole.
d, and the other end is hung on the spring support protrusion 20i at the base of the support piece 20g, and then remove the tripping plate 2.
3, bimetal pressure-sensitive protrusion 23c, stepped portion 23
h and plunger pressure sensitive projections 23i, 23j
are rotated about the support shaft protrusion 23f in the forward direction, and the lower end 23l is attached to the trip plate positioning protrusion 20j of the support piece 20g.
is locked.

The movable frame 24 is connected to the vertical slit 2 of the frame 20.
It is an insulating plate-like body with a thickness that allows it to be inserted into the base 1 and a length that is about three times the frame width, and has arcuate edges on both sides. It is slidably inserted in the longitudinal direction of the slit 20d, and the lower surfaces of both ends thereof come into contact with the protrusion 15d of the movable contact 15 installed on the base 1.

The base installation of this second block B is as follows:
20g of supporting pieces of the frame 20 as shown in Fig. 3.
into the container part 1a of the base 1, facing the load side of the base 1, rotate the tripping plate 23 a little, and insert the plunger 7 onto the plunger insertion part 23k.
Pass it through so that the brim 7a is positioned, and insert the base 1
Screw the mounting screw 31 into the screw hole 20a at the bottom through the mounting hole 1d on the back side and tighten it.
In this state, the end surface of the second movable shaft 29 faces the inner surface of the guide wall 1h of the base 1, and its axial movement is prevented from coming off. 1f, the bimetal pressure-sensitive protrusion 23c of the tripping plate 23 faces the upper end 18c of the bimetal 13, and when the cover 2 is further covered with the base 1, the operating part 21a of the handle 21 protrudes from the handle hole 2b, Both end surfaces of the first movable shaft 27 are guided by the hanging wall 2f and are prevented from coming off, and the bent portion of the link 26 is allowed to freely pass through the slit 2h. In addition, due to this arrangement structure on the base, when the breaker is installed on a pillar or wall indoors or outdoors,
Since the base 1 has the power supply side at the top and the load side at the bottom, the bimetal 13 and plunger cylinder 6
The heat generated by the tripping plate 23 due to convection
Heat is exhausted to the outside from the handle hole 2b through the window hole 23a, the inside of the frame 20, and the slits 1f and 2h of the base 1.

(d) Third block (Fig. 1, Fig. 2, Fig. 10)
Figure) The third block C is composed of a fixed contact 32, an arc travel plate 33, an arc extinguishing grid 34, and a power supply side connection terminal 35, as shown in Figure 10. As shown in FIG. 10, the fixed contact 32 is a plate-shaped body with a predetermined width, and one end thereof is folded upward in a U-shape, and a fixed contact 36 is fixed to the upper surface of the folded piece 32a. 36 and the end edge of the folded piece 32a, a protrusion 32b for arc transfer and arc travel plate positioning having approximately the same height as the fixed contact 36 is formed by pressing from the lower surface, and a protrusion 32b for positioning the arc transfer and arc traveling plate is formed by pressing from the lower surface. The power supply side terminal board 32c is bent into a Z-shape based on the step on the base installation. The arc traveling plate 33 is made by bending a plate-like body into a substantially L-shape, and pressing the center of the vertical piece 33a from the bent part to the upper end from the outer surface to form a reinforcing rib 33b for arc traveling and preventing thermal deformation on the inner side. death,
Stepped portions 33c for placing arc extinguishing grids on both sides of the upper end.
A notch 33e that fits into the positioning protrusion 32b is formed at the edge of the horizontal piece 33d, and the mounting piece 3 is inserted from one side of the horizontal piece 33d.
3f is made to hang down to form a fork-shaped caulking leg 33g at the tip. The structure of the power supply side connection terminal 35 is the same as the load side connection terminal,
The same symbols are attached.

Further, the arc extinguishing grid 34 has a V-shaped groove 34b at one end of seven magnetic material grid plates 34a.
are cut out, positioning recesses 34c and caulking protrusions 34d on both sides are formed and arranged at equal intervals, and an insulating side plate 34e having holes corresponding to the protrusions 34d is engaged and fixed on both sides by caulking. A hook-shaped recessed placement portion 34f is formed on both sides of 34e,
The upper and lower surfaces of the side plate 34e are formed into a recess 34c.
position.

The third block C is assembled on the base 1 as follows. That is, with the power supply side connection terminal 35 attached to the terminal board 32c, the second
As shown in the figure, the terminal 35 is fitted into the terminal receptacle 1r of the base 1, and the fixed contact 32 is fitted into the receptacle 1v of the base 1. After positioning the mounting piece 33f of the arc traveling plate 33 on the base 1
While passing through the mounting slit 1w of the horizontal piece 33
The notch 33e of d is positioned on the protrusion 32d, and while pressing the arc traveling plate 33 onto the folded piece 32a, the clamping leg 33g is caulked into the mounting slit 1w from the back surface of the base 1 under the elasticity of the folded piece 32a. As a result, the contactor 32 is firmly fixed, and the horizontal piece 33d of the arc traveling plate 33 is held by the elastic force of the folded piece 32a.
The folded piece 32a is press-contacted and electrically connected, and the vertical piece 33a is erected at a predetermined position by positioning to the protrusion 32b, and faces the upper vertical piece 12a of the arc travel plate 12 described above. On the other hand, the movable contact 16 faces above the fixed contact 36. Also, arc extinguishing grid 3
4 is the mounting part 34 with the V-shaped groove 34b facing downward.
The cover 2 is placed on the steps 12b and 3c at the upper ends of the arc traveling plates 12 and 33 by f, and the cover 2 is covered with the base 1 in this state, so that the presser rib 2j on the back surface of the cover is pressed against the arc extinguishing grid 34.
The top surface is pressed and fixed, and the top end of the rib 33b of the arc traveling plate 33 faces the innermost part of the V-shaped groove 34b of the grid 34, and the inner surface of the side wall of the cover 2, the hanging wall 2f, and the base The arc extinguishing grid 34 and the contacts 16, 36 are connected to the outer surface of the guide wall 1h of No. 1.
An arc extinguishing chamber 32g is formed surrounding the area. Furthermore, with this arrangement structure, the arc extinguishing part and the bimetal 13 are separated by a distance, and since the arc extinguishing grid is located at the upper level when the disconnector is mounted on the wall, the thermal influence of the arc extinguishing part is reduced by the bimetal 13. In addition, the slit 2h, notch 2m, and slit 2n of the cover 2 form an arc gas exhaust passage with a distance, and the upper surface of the arc extinguishing grid 34 and the handle hole 2b of the cover 2 are connected to the hanging wall 2f.
, forming an even larger separation distance.

() Operation It is divided into ON operation, trip operation, OFF operation and arc extinguishing operation.

(b) ON operation (a) OFF operation (Figures 6, 7 and 11)
Figure b): As shown in Figure 7, the tripping plate 23 is moved by the spring 30 to
The handle 21 is positioned in a normal posture on the protrusion 20j of the frame 20 by the spring 25
The reset operating protrusion 21c of the handle 21 pushes down the tripping plate engaging part 22a of the tripping lever 22 and hooks it onto the tripping lever latch engaging step 23n of the tripping plate 23, while the movable contact As shown in FIG. 6, the movable contact 16 is separated from the fixed contact 36 by the action of the return spring 17, and the movable frame 24 of the protrusion 15d is positioned above the vertical slit 20d of the frame 20. Due to this opening, the power supply side connection terminal 3
5 and the load side connection terminal 19, the electric circuit is opened and the load side connection terminal 19 is in an off state.

(b) Operation from OFF state to ON state: Push the handle 21 in the OFF state to the left in the figure to bring it into the state shown in FIGS. 2, 3, and 11a. When the handle 21 is pushed to the position shown in FIG. 3, the first movable shaft 27 rotates about the support shaft 20l from the imaginary line to the solid line as shown in the figure, The movable shaft 29 moves down the slit 20e. Accordingly, the trip lever 22 rotates around the engaging portion 22a supported by the tripping plate 23, and its contact pressure spring 28 comes into contact with the upper surface of the movable frame 24 and pushes it down.
The lower surface of the movable frame 24 comes into contact with the protrusion 15d of the movable contact 15 as shown in FIG.
Push down against the repulsive force of 7. In this way, the second movable shaft 29 and the movable contact 15 move downward until the first movable shaft 27 approaches the plane (dead center) containing the support shaft 20l and the second movable shaft 29. The contact 16 comes into contact with the fixed contact 36, and the minute is moved to the second movable shaft 29 under the support of the movable contact 15.
Contact pressure spring 2 supported in a biased state
8 is further pushed by the movable frame 24 and deflects,
As a reaction, contact pressure is applied between the contacts 16 and 36. When the first movable shaft 27 exceeds the plane (dead center), the reaction of the contact pressure spring 28 acts to move the first movable shaft 27 away from the plane in a direction beyond the plane, causing the stop of the nearest frame 20 to move away from the plane. The handle 21 is engaged and supported by the portion 20m, and the handle 21 is in the on state maintaining the state shown in FIG. In this way, the electric circuit is closed and power is applied to the load.

(b) Trip operation (a) Bimetal operation (Fig. 11c): When an overcurrent flows in the circuit in the on state, bimetal 1
3 is self-heated. As a result, the bimetal 13 performs a bending motion in FIG. 2, and the upper end 13c moves toward the bimetal pressure-sensitive protrusion 23c of the tripping plate 23 using the lower end 13b as a fulcrum. When the bimetal 13 moves through this mutual distance set to a predetermined time-limiting characteristic by the adjustment screw 14, the protrusion 23
c to rotate the tripping plate 23 around the support shaft 23f, and as shown in FIG.
8n is the engaging portion 22a of the trip lever 22
move away from Due to this tripping operation, the spring force of the return spring 17 and the spring force of the contact pressure spring 28 are manifested through the movable frame 24 and the movable contact 15, and the trip lever 22
is jumped up vigorously around the second movable shaft 29, and at the same time the movable frame 24 is pushed up, the movable contact 15 performs an opening operation, and the fifth
In the trip-free state shown in FIG.

(b) Electromagnetic operation (Fig. 11 d, e): When a short-circuit current flows through the electric circuit, the excitation of the coil 10 increases, generating an attractive force greater than the spring force of the return spring 8 that supports the plunger 7, and fixing it. Attracted to the iron core 9, the collar 7a of the plunger 7 instantly pushes the plunger pressure-sensitive projections 23i, 23 of the tripping plate 23 faster than the bimetal 13 pushes the pressure-sensitive projections 23c.
j to trip the tripping plate 23 (FIG. 11d), and the thin shaft lower end 7d of the plunger 7 penetrates downward through the insertion hole 9a of the fixed iron core 9 and the center of the return spring 17. The rear end of the movable contact 15 is struck to forcibly open the movable contact 15 (FIG. 11e).

(c) Reset operation: When the trip-free state (Fig. 11c, d) is reached, the pressing force applied to the second movable shaft 29 in Fig. 5 disappears, and the second movable shaft 29 and the support shaft 20l
Since the plane including the above is no longer configured as a dead center, the return spring 25 applied to the handle 21 returns to the OFF state. As the handle 21 returns, the engagement portion 22a of the trip lever 22 is lowered by the reset projection 21c and faces the engagement stepped portion 23n of the tripping plate 23. On the other hand, due to the break in the electric circuit, the bimetal 13 is naturally cooled and returned to its original position, and the plunger 7 is no longer energized and returned to its original position by the return coil spring 8, and the tripping plate 23 is returned to its normal position by the spring 30. Return. 6, 7 and 11b.
It is in the off state shown in .

(c) Off operation (from on state to off state): In the on state shown in FIG. 11a, operate the handle 21 in the off direction (to the right). As a result, the first movable shaft 27 separates from the stopper portion 20m of the frame 20 and attempts to transition from the solid line to the virtual line in FIG. ), the push-up force from the contact pressure spring 28 and the return spring 17 applied to the second movable shaft 29, and the return spring 25 applied to the handle force the handle 21 to forcefully return to the OFF state shown in FIG. 11b. Fall down. At the same time, the second movable shaft 29 moves upward, the trip lever 22 rotates about the engagement part 22a, and the movable contact 15 moves
Push up 4 to open the pole. The trip plate 23 remains in place. In this way, it is turned off.

(d) Arc-extinguishing action Contacts 16 and 36 when the short-circuit current is extinguished
Due to the arc generated between the movable contact 15
Since the folded piece 32a of the fixed contact 32 faces the contacts 16 and 36 in the same direction, a current flows in a horizontal U-shape as shown in FIG. 6 even after opening, thereby extinguishing the arc. A magnetic driving force is generated to extend the arc in the direction of 34, causing the arc to move from the positioning protrusion 32b of the fixed contact 32 onto the rib 33b of the arc traveling plate 33, while the movable contact 15 side also moves from the protrusion 15c to the same potential. V-shaped groove 34b of the arc extinguishing grid 34
The grit plate 34a increases the arc voltage to extinguish the arc. Further, the arc gas is discharged from behind the arc extinguishing grid 34 into the space formed by the holding rib 2j of the cover 2, and passes through the exhaust passage between the slit 21 and the arc running plate 33 having a recess formed by the rib 33b to the notch 2m. and is exhausted to the outside through the slit 2n.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway plan view of the on-state circuit and breaker that forms the basis of this invention, and Figure 2 is its -
Line sectional view, Figure 3 is the first - line sectional view, Figure 4 is the line sectional view.
The figures are a sectional view taken along the line in FIG. 3, FIG. 5 is a sectional view taken along the line in FIG.
Figure 8 is an exploded perspective view of the second block, Figure 9 is a perspective view with the cover removed, Figure 10 is an exploded perspective view of the first and third blocks, and Figure 8 is an exploded perspective view of the second block. Figure 11 Operation diagram of the ladder and disconnector, 12th
The figure is a partial view of the first embodiment of this invention, FIG. 13 is a diagram of its operation, and FIG. 14 is a partial view of the frame of the second embodiment. 15...Movable contact forming the movable contact portion, 2
0...Frame, 21...Handle, 20e...
Guide slit, 20l...Spindle, 20m...Stopper part, 20m', 20m''...Groove, 21...Handle, 22...Trip lever, 23...Trip plate, 24...Movable frame, 26...Link , 27...
...first movable axis, 29...second movable axis.

Claims (1)

[Scope of utility model registration request] a handle having a first movable shaft; a frame rotatably supporting the handle on a support shaft; and a stopper portion formed on the frame and abutting the first movable shaft when the handle is in the on-operation position. , a groove provided in the frame for moving the position of the stopper portion by plastic deformation, a link having one end connected to the first movable shaft and a second movable shaft at the other end, and the frame. a guide slit that is formed in a shape and guides the second movable shaft linearly; a trip lever having one end connected to the second movable shaft and the other end locked to a tripping plate; and a trip lever that is pressed by the trip lever. A circuit breaker equipped with a movable contact part that closes when the circuit is closed.