JPH0635348Y2 - Multi-pole circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a multi-pole circuit and a circuit breaker, and more particularly to improvement of a trip bar.

[Conventional technology]

A conventional multi-pole circuit or circuit breaker of this type will be described with reference to FIGS. FIG. 8 is a front view, and FIG. 9 is a line of FIG.
IX-IX sectional view, FIG. 10 is the same view as FIG. 9 showing the off state, FIG. 11 is the same view as FIG. 9 showing the trip state, 12
The figure shows an enlarged view of the trip relay mechanism when turned on and off, No. 13
The figure is an enlarged view of the trip relay mechanism during tripping.
In the figure, (1) is a case made of a base (1a) and a cover (1b) and a breaker case, which has a mechanism pole (1A) with an opening / closing mechanism and adjacent poles (1B), (1B) without a switching mechanism. ) And have. (2) is a fixed conductor on the power supply side fixed to the base (1a), (3) is a fixed contact fixed to the fixed conductor (2), and (4) is an automatic tripping device, which is not shown but is, for example, a thermo-electromagnetic type. Alternatively, an electronic mechanism is arranged.
(5) is a fixed conductor on the load side connected to the automatic trip device (4), (6) is a movable contact, and (7) is a movable contact (6).
A movable contact fixed to the movable contact, (8) a flexible conductor for connecting the movable contact (7) to the automatic tripping device (4) via the connection conductor (9), and (10) a movable contact ( A second contact arm that holds 7) and a movable contactor (7) and a first contact arm (10a) to which an opening / closing operation mechanism described later is linked are rotatably supported by a first pin (11). Is formed separately from the contact arm (10b). Reference numeral (12) is a support shaft of the contact arm (10), which includes a first contact arm (10a) and a second contact arm (1).
0b) and are each rotatably supported. (13) is a crossbar connecting the first contact arms (10a) of the respective poles, (14) is a guide hole provided in the first contact arms (10a) and extending in the opening / closing direction, and (15) is a second The long hole provided in the contact arm (10b) of the
4) It extends in the direction intersecting with. (16) is a guide hole (1
4) and a second pin (1
Reference numeral 7) is a tension spring provided between the first pin (11) and the second pin (16), and biases the second pin (16). (18)
Is the movable contactor (7) and the second contact arm (10b)
A contact pressure spring provided between and, (19) a handle for operating a chopstick and a circuit breaker, and (20) an opening and closing operation mechanism for a chopstick and a circuit breaker. The cradle (20a), the upper link (20b) and the lower link ( 20c) and so on. (21) is a stopper pin provided on the cradle (20a), and (22) is a lower link (20c).
A connecting pin for connecting to the contact arm (10a) of (1), (23) is a clasp (2) that engages with the cradle (20a) by the locking portion (23a) to position the cradle (20a).
4) is the center axis of rotation of the scraper (23), and (25) is the scraper (23) engaged with the scraper (23) by the roller (25a).
Is a cradle (20a) that prevents it from being rotated, (26) is the central axis of rotation of the latch lever (25), (27) is the latch lever (25) and locking piece (27a)
Is a trip bar that is engaged with the latch lever (25) to prevent the latch lever (25) from disengaging from the scraper (23) so as to prevent the ratchet lever (25) from rotating.
As shown in the figure, it extends to the adjacent poles (1B) and (1B) on both sides. (28) is the center of rotation of the trip bar (27), (29)
Is a torsion spring inserted into the rotation center shaft (24), and biases the rake (23) to the cradle (20a) and the latch lever (25) to the rake (23). (30) is the trip bar (27) and the latch lever (25)
A pulling spring that urges in the state of being engaged with, and (31) is a mechanism frame fixed to the base (1a), and both side plates (31a), (3
A trip relay mechanism, an open / close operation mechanism (20), and the like, which are composed of a scraper (23), a latch lever (25), and a trip bar (27), are supported between 1a). (32) is a tripod of the automatic tripping device (4), which is extended during tripping and rotates the trip bar (27) against the pulling spring (30).

Next, the operation will be described. In the ON state shown in FIGS. 8, 9, and 12, the power source side fixed conductor (2) → fixed contact (3) → movable contact (6) → movable contact (7) → flexible conductor (8) → Connection conductor (9) → Automatic trip device (4) →
A current flows in the direction of the load side fixed conductor (5). When the operation handle (19) is turned off (in the direction of the arrow (33) in Fig. 9), the opening / closing operation mechanism (20) causes the contact arm (1
0) is lifted and the movable contact (6) is separated from the fixed contact (3) together with the movable contact (7) as shown in FIG. At this time, the pulling spring (17) causes the second pin (16) to move.
Fits into the recess (14a) of the guide hole (14),
The second contact arm (10b) is integrated with the first contact arm (10a) and lifted by the opening / closing operation mechanism (20), and stops by colliding with the stopper pin (21) with the support shaft (12) as a fulcrum. In the ON state of FIG. 9 and the OFF state of FIG. 10, since the tripod (32) of the automatic trip device (4) does not extend, the tripple mechanism is set to the
Maintaining the condition shown in Figure 12, the cradle (20a) is fixed.

Next, when an overcurrent flows in the ON state shown in FIGS. 8, 9, and 12, the automatic trip device (4) operates and the tripod rod (32) extends, so that the state shown in FIG. 13 is shown. When the trip bar (27) is rotated clockwise against the tension spring (30) and the locking piece (27a) is disengaged from the latch lever (25), the latch lever (25) can rotate clockwise. The flip-up force of the cradle (20a) causes the blade (23) to rotate clockwise against the twist spring (29), at which time the latch lever (25) is also twisted by the blade (23). ), It is rotated clockwise, and the state shown in Fig. 13 is momentarily reached. The rotation of the cradle (20a) causes the opening / closing operation mechanism (20) to operate, so that the contact arm (10) is held and the movable contact (6) is opened as shown in FIG. I refuse. This is the so-called trip state. At this time as well, the second pin (16) is fitted in the recess (14a) of the guide hole (14) by the pulling spring (17) as in the OFF state of FIG. ) Is lifted by the opening / closing operation mechanism (20) integrally with the first contact arm (10a) and stops by colliding with the stopper pin (21) with the support shaft (12) as the fulcrum.

[Problems to be solved by the invention]

In the conventional multi-pole circuit breaker as described above, the trip bar having the latch and the latch lever that engages with the latch, and the latch portion that engages with the latch is attached to the mechanism frame as one part of the trip relay mechanism. They must be assembled, and when they are assembled, they must be assembled in an orderly manner according to the assembly order. Also, the trip bar is attached to the circuit breaker case after subassembly to the mechanism frame as a part of the trip relay mechanism. Since it is long (spans each pole), there is a problem that assembly workability is poor. Furthermore, since the long trip bar is located above the trip relay mechanism, for example, the mechanism frame incorporating the trip relay mechanism is fixed to the breaker case or installed at the bottom of the breaker case. However, there is a problem in that the workability of assembling in the breaker case is poor because it hinders the connection between the connecting conductor and the fixed conductor on the load side.

The present invention has been made to solve such a problem, and by constructing the trip bar by dividing it into a trip bar body and a latch portion, a multi-pole circuit capable of improving the workability of assembling the trip bar and the circuit breaker is provided. The purpose is to get a break.

[Means for solving problems]

A multi-pole circuit breaker according to the present invention is a latch portion that engages a trip bar with a latch lever that engages with a rake, is supported by a mechanism frame, and a trip member of an automatic tripping device abuts and rotates during a trip. And a trip bar body that engages with the latch lever that engages with the scraper, is attached to the latch part installed in the breaker case, and extends to the adjacent pole.

[Action]

In the present invention, the latch portion is assembled together with the engaging blade and the latch lever, which are part of the trip relay mechanism, so as to be linked to the mechanism frame and attached to the breaker case, and then the trip bar is attached to the latch portion. The body can be assembled and fixed. Therefore, the trip bar body penetrating each pole can be assembled in the latter half of the circuit breaker assembly process.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to FIGS. 1 to 7. 1 is a front view, FIG. 2 is a perspective view of the trip relay mechanism (excluding the trip bar body), FIG. 3 is an on / off state diagram of the trip relay mechanism (excluding the trip bar body), and FIG. 4 is a trip instant. FIG. 5 is the same view as FIG. 3, FIG. 5 is a perspective view of a skeleton, FIG. 6 is a perspective view of a latch lever, and FIG. 7 is an exploded perspective view of a trip bar. The reference numerals are given and the description is omitted. In the figure, (24A) is a rotation center shaft installed on both side plates (31a) and (31a),
Reference numeral A) is a flat-shaped blade, which has recesses (23b) and (23b) into which the rotation center shaft (24A) is fitted, and a roller engaging portion (23c) formed at the tip of one arm. (25A) is a fork-shaped latch lever that has a long hole (2
5b) and a notch (25c), a locking piece engaging portion (25d) with which a locking piece described later engages, and a spring hooking piece (25e). (26A) is a central axis of rotation, and rotatably supports the latch lever (25A) on the side plate (31a). (28A) is both side plates (31
The rotation center shafts erected on a) and (31a), and (34) is a trip bar that stops the latch lever (25A) from being rotated by the rake (23A). The latch lever (25A)
A locking piece (34a) that engages with the hole, holes (34b), (34b) through which the rotation center shaft (28A) passes, a spring hooking piece (34c), and a rod contact portion (34d) with which the tripod (32) abuts. Latch part (34A) made of metal stamped product with
B), (1B) and the screw hole (34A) of the latch (34A).
Trip bar body (34B) made of a molded resin product having holes (34f) and (34f) corresponding to (e) and (34e)
And the mounting screws (34C) and (34C) for mounting the trip bar body (34B) to the latch (34A). (35) is a double torsion spring, and the ring part (35
It is attached to the central axis of rotation (24A) by a) and the folded part (35
b) biases the lacer (23A) counterclockwise so that it engages the cradle (20a), and one end (35c) biases the latch lever (25A) counterclockwise so that it engages the lacer (23A). , The other end (35d) urges the trip bar (34) counterclockwise so as to engage with the latch lever (25A). (36) is a stop lever (25A) stopper.

Next, the operation will be described. As shown in Fig. 2 and Fig. 3, when the tripod (32) is not in the on / off state, the double-torsion spring (35) urges the scraper (23A), the latch lever (25A) and the trip bar (34). Cradle (20a) to maintain the condition of Fig. 3
Are held by the shavings (23A). Then, as shown in FIG. 4, when the trip blade (32) is in an instantaneous trip state, the trip bar (34) is rotated in the clockwise direction against the double torsion spring (35) to engage the locking piece (34a). ) Is disengaged from the locking piece engaging part (25d), the latch lever (25A) can rotate clockwise, and the cradle (20a) flip-up force (37) causes the clasp (23A) to move to the double torsion spring. It is rotated clockwise against (35) and the latch lever (25A) also moves at
A) causes it to rotate clockwise against the double torsion spring (35), and the state shown in Fig. 4 is momentarily obtained. Immediately after the trip strip (32) returns to its original position, the blade (23A), the latch lever (25A) and the trip bar (3
4) and are restored to the state shown in Fig. 3 by the double torsion spring (35). Then, the reset operation causes the cradle (20a) to be engaged with the snapping blade (23A) with a "sling".

When the trip bar (34) is divided into the trip bar main body (34B) and the latch part (34A) as described above, the latch part (34A) serves as a part of the trip relay mechanism as shown in FIG. Assemble the mechanism frame (31) in a linked manner, attach it to the base (1a) of the case (1) with the mechanism frame (31), and then attach it to the latch part (34A) with the attachment screws (34C) and (34C). Since the trip bar main body (34B) can be fixed, the trip bar main body (34B) penetrating each pole can be assembled in the final step of cutting and disconnecting.

Also, replace the trip bar (34) with the trip bar body (34B).
If the trip bar body (34B) can be a molded resin molded product and the latch part (34A) can be a metal stamped product, the structure can be adapted to the function. At the same time, the trip bar (34) can be downsized and the cost can be reduced. The latch part (34A) is not limited to a pressed product and may be a metal product.

Although the trip bar body (34B) and the latch portion (34A) are fixed to each other by the mounting screw (34C) in the above embodiment, they may be fixed by means of press fitting or the like.

[Effects of the Invention] As described above, according to the present invention, the latch portion is assembled together with the engaging blade and the latch lever, which are one part of the trip relay mechanism, to be linked to the mechanism frame and assembled into the breaker case. After mounting, the trip bar body can be assembled and fixed to the latch part.Therefore, the latch part is sub-assembled in linkage with the mechanism frame and the latch lever, which are in engagement with each other, and then the circuit breaker. After being attached to the case, the trip bar body that penetrates each pole can be assembled in the latter half of the circuit breaker assembly process, making the trip bar assembly work extremely easy and improving the circuit breaker assembly workability. is there.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a perspective view of a trip relay mechanism, FIG. 3 is an ON / OFF state diagram of the trip relay mechanism, and FIG. The same view as FIG. 5, FIG. 5 is a perspective view of a skeleton, FIG. 6 is a perspective view of a latch lever, FIG. 7 is an exploded perspective view of a trip bar, FIG. 8 is a front view showing a conventional one, and FIG. Is a sectional view taken along the line IX-IX in FIG. 8, FIG. 10 is the same view as FIG. 9 showing the off state, and FIG. 11 is the same view as FIG. 9 showing the trip state,
Figure 12 is an enlarged view of the trip relay mechanism when it is on and off,
FIG. 13 is an enlarged view of the trip relay mechanism during trip. In the figure, (1) chopstick and breaker case, (1A) mechanical pole, (1B) adjacent pole, (4) automatic trip device,
(20) is an opening / closing operation mechanism, (20a) is a cradle, (23A) is a skeleton, (25A) is a latch lever, (31) is a mechanism frame, (32) is a trip member, (34) is a trip bar,
(34A) is the latch part, (34B) is the trip bar body, (34A)
C) is a mounting screw. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] 1. A circuit breaker case having multiple poles, an opening / closing operation mechanism having a cradle installed in the circuit breaker case, a mechanism frame installed on a mechanism pole having the opening / closing operation mechanism, and a mechanism frame A trip bar that is supported and whose end extends to an adjacent pole without an opening / closing mechanism of the circuit breaker case, an automatic trip device that rotates the trip bar by a trip member, and a cradle that engages with a cradle of the opening / closing operation mechanism. And the positioning of
A latch lever that engages with each of the scraping bar and the trip bar to prevent the scraping bar from being rotated by the cradle, and when the trip bar is rotated by the trip member of the automatic trip device at the time of trip, A multi-pole circuit interruption in which the latch lever disengages from the trip bar and is opened together with the scraper so that the cradle rotates and flips up by rotating the scraper and the latch lever, and the opening / closing operation mechanism operates to trip. In the container, the trip bar engages with the latch lever that engages with the rake, is supported by the mechanism frame, and the trip member of the automatic tripping device abuts and rotates during a trip; and The latch lever that engages with the blade And a trip bar main body which is attached to the latch part installed in the circuit breaker case and extends to the adjacent pole. 2. The multipole according to claim 1, wherein the trip bar body is a molded resin molded product, the latch portion is a metal press product, and both are assembled by mounting screws. Circuit breaker.