JPH03250521A - Tripping cross-bar of circuit breaker - Google Patents

Abstract

PURPOSE:To enhance the supporting accuracy without sacrificing easiness in assembly works and stabilize the tripping characteristic by forming a caulking pin for coupling a mounting metal piece in a signal piece with an insulation bar. CONSTITUTION:At the undersurface of a mounting metal piece fitting part of an insulation bar 15, a caulking pin 24 is formed in a single piece therewith as protruding downward. This pin 24 of insulation bar 15 is inserted in a caulking hole 25 in a mounting metal piece 16, and the tip of the pin 24 is deformed by ultrasonic shaping, and the mounting metal piece 16 is caulked to the insulation bar 15. As this metal piece 16 is installed on a side plate 10 solely, a pin 19 can be inserted without being hindered by the insulation bar 15. This allows decreasing a gap 23 between holes 17, 18 and the pin 19 as much as practicable, which nullifies the left-and-right inclination of this tripping cross-bar concerned 13 likely at the time of tripping motion. Thus the tripping performance is stabilized.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a trip crossbar that forms part of a tripping mechanism in a small circuit breaker such as a molded circuit breaker.

[Prior art 1] First, Fig. 5 is a vertical cross-sectional view of the center pole part showing the general configuration of a three-pole circuit breaker. , 2 is cover, 3
is a power supply side terminal, 4 is a fixed contact integrated with this, 5 is a movable contact that connects and separates from this, 6 is a lead wire that connects the movable contact 5 and overcurrent exception device 7, 8 is an overcurrent The load-side terminals are connected to the disconnection device 7, and these form a current-carrying path. The movable contact 5 is driven to open and close by an opening/closing mechanism 9, and the opening/closing mechanism 9 is in the reset state shown in the figure when a latch 11 supported by a side plate 10 having side plates 10 on both sides of the movable contact 5 is engaged with a latch receiver 12. is maintained. The latch receiver 12 receives a force from the latch 11 in the clockwise direction in the figure, but is prevented from rotating by the claw 14 of the trip crossbar 13 that engages with the back surface thereof. If an overload current or short circuit current flows in the illustrated state, the bimetal 7a of the overcurrent release device 7 or the armature 7
b hits the operation piece 13a of the trip crossbar 13 to rotate it counterclockwise to release the engagement between the pawl 14 and the latch receiver 12. As a result, the latch receiver 10 rotates clockwise, the latch 11 is no longer locked, and the movable contact 5 is opened and separated by the operation of the opening/closing mechanism 9. FIG. 6 is a perspective view of the side plate 10 that supports the trip crossbar 13, seen diagonally from the rear, FIG. 7 is a perspective view showing the conventional configuration of the trip crossbar 13, and FIG. 8(A)
2 is an enlarged front view of the central portion of the trip crossbar 13, and FIG. In the figure, the trip crossbar 13 consists of a round insulating bar 15 spanning each phase and a U-shaped mounting bracket 16 fixed to the insulating bar. It is rotatably supported by the side plate 10 fixed to the case 1 via a pin 19 inserted through the hole 17 and the hole 18 of the side plate 10 . The aforementioned claw 14 is integrally formed on one arm 16a of the mounting bracket 6, and an operating piece 13a that receives the operating force of the overcurrent release device 7 is integrally formed on the insulating bar 13 for each phase. As shown in FIG. 8(B), the mounting bracket 1 of the insulating bar 13
The mounting portion 6 is cut out leaving an L-shaped cross section, and the mounting bracket 16 is pressed against that portion from below and crimped with two metal crimping pins 20. To attach the trip crossbar 13 to the side plate lO, as shown in FIG. Using the formed groove 21, the pin 19 is inserted while being moved in the direction of arrows P and P2 in FIG. If the pin 19 is left as it is, it will come out in the right direction in FIG. 7, so it is necessary to take measures to prevent it from coming out. In the case shown in the figure, a bottomed hole 22 is provided in the insulating bar 13 from above and below with a groove 21 in between, and after the pin 19 is inserted, the bottom of this hole 22 is pushed out by plastic deformation as shown in FIG. 8(A). I'm trying to block 21. [Problems to be Solved by the Invention] By the way, in order to attach the trip cross bar 13 to the side plate 10 in such a conventional configuration, it is necessary to align the hole 17 of the mounting bracket with the hole 18 of the side plate and insert the pin 19. ing. In that case, the gap 23 (
(Fig. 8) is large, the trip crossbar 13 will tilt to the left and right when it rotates under the action of the overcurrent release device 7 (Fig. 5), and the latch receiver 12 and pawl 14 will disengage. The amount of displacement of the bimetal 7a or the armature 7b for this purpose varies for each phase, making the tripping characteristics unstable. On the other hand, if the gap 23 is made smaller, it becomes difficult to align the four left and right holes 17 and 18 within the narrow cutout space of the insulating bar 15 and insert the pin 19 therein. Furthermore, even if an attempt is made to connect the mounting bracket 16 and the insulating bar 13 after the mounting bracket 16 has been attached to the side plate 10, the pin 19 gets in the way and the caulking pin 2
0 caulking work is not possible. This invention attempts to solve these problems,
It is an object of the present invention to provide a trip crossbar for a circuit breaker that has improved support accuracy and stabilized tripping characteristics without impairing assembly workability. [Means for Solving the Problems] In order to achieve the above object, the present invention has one of the following aims: to reduce the gap between the hole in the mounting bracket and the side plate and the pin inserted therein (while reducing the gap between the pin and the hole in the side plate). A means for easy insertion is provided, and another means is to increase the gap while eliminating play with the pin.That is, in the present invention, first, a caulking pin for connecting the mounting bracket is insulated. After the mounting bracket is supported by the side plate, the crimping pin is inserted into the crimping hole of the mounting bracket to deform its tip, and the mounting bracket is crimped to the insulating bar. Further, in the present invention, an inclined surface is formed on the insulating bar on which the tip of the pin protruding from the side plate rides.

[For production] By integrally forming the caulking pin that connects the mounting bracket to the insulating bar, the mounting bracket can be caulked to the insulating bar even after the mounting bracket is supported by the side plate. Therefore, if you attach the mounting bracket separately to the side plate before caulking it to the insulating bar, the insulating bar will not get in the way when inserting the pin into the hole in the mounting bracket and the side plate, and the gap between this hole and the pin will be reduced. Even if it is made smaller, there will be no problem in working. On the other hand, in a configuration in which the insulating bar forms an inclined surface on which the tip of the pin protruding from the side plate rides, the pin inserted through the hole in the mounting bracket and the side plate rides on the inclined surface and is inserted into the hole. This eliminates play in the pin even if the gap between the hole and the pin is large. 【Example】

Hereinafter, the present invention will be explained in detail based on the drawings. In addition,
The same reference numerals are used for the same or corresponding parts as in the conventional example. Figures 1 and 2 show examples of the present invention, and Figure 1 (
A) is the trip crossbar attached to the side plate.
Figure 2 (A) is a front view of the mounting bracket attached to the side plate, and Figure 2 (B) is a cross-sectional view taken along line B-B. It is a sectional view along a line. In the figure, the mounting bracket 16 and side plate 10 are substantially the same as the conventional one, but the gap 23 between the pin 19 and the holes 17 and 18 into which it is inserted is smaller (and has almost no play) than the conventional one. The mounting bracket 16 is designed to prevent this from occurring by itself before being coupled to the insulating bar 15
Assemble as shown. On the other hand, a caulking pin 24 is integrally formed on the lower surface of the mounting part of the insulating bar 15 so as to project downward. Therefore, insert the caulking pin 24 of the insulating bar 15 into the caulking hole 25 of the mounting bracket 16 in the state shown in FIG.
4 is deformed by ultrasonic molding, and the mounting bracket 16 is caulked to the insulating bar 15. Since the insulating bar 15 does not require a groove 21 (Fig. 7) for inserting the pin 19,
The right end of the pin 19 shown in FIG. 1 also comes into contact with the wall 15a of the insulating bar 15 and is prevented from being removed. According to the illustrated configuration, the mounting bracket 16 is mounted on the side 7'l/
-) Since it is attached to 10, the pin 19 can be inserted without being obstructed by the insulating bar 15. Therefore, the gap 23 between the hole 17, 18 and the pin 19 can be made as small as possible, and the trip crossbar 1 during the trip operation can be
The horizontal inclination of 3 is eliminated and the tripping characteristics are stabilized. Further, there is no need for a means to prevent the pin 19 from being removed. Figures 3 and 4 show another embodiment of the present invention;
The figure is a perspective view, and FIG. 4 is an enlarged plan view of the central pole portion. In this embodiment, an inclined surface 15a is formed on the insulating bar 15, and the tip end 19a of the pin (FIG. 4), which projects from the side plate 1o to the left side in the drawing, rides on this inclined surface 15a. Similar to the conventional example shown in FIG.
9 rides on the inclined surface 15a and is further pushed in, the tip 19a is elastically deformed as shown in FIG. In this state, the pin 19 is pressed to one side in the hole 17.1 by its elastic force, so that the pin 19
The play of pin 19 with respect to pin 8 is eliminated. Therefore, the gap 23 between the pin 19 and the hole 17, 18 can be made larger to some extent, which facilitates the assembly work and also allows for larger dimensional tolerances, which reduces processing costs.

【Effect of the invention】

According to this invention, the play of the pin that supports the mounting bracket on the side plate can be reduced without impairing assembly workability, and the tripping characteristics of the circuit breaker can be stabilized.

[Brief explanation of drawings]

Figure 1 (A) is a front view of the main part of the embodiment of this invention, Figure 1 (B) is a sectional view taken along the line B-B, and Figure 2 (A) is a side view of the mounting bracket shown in Figure 1. Figure 2 (B) is a front view of the state attached to the plate, Figure 2 (B) is a sectional view along line B-B, Figure 3 is
The figure is a perspective view of another embodiment of the present invention, FIG. 4 is an enlarged plan view of the main parts thereof, FIG. 5 is a longitudinal cross-sectional view showing the general configuration of a circuit breaker, and FIG. FIG. 7 is a perspective view of the conventional example, and FIG. 8(A) is a perspective view of the side plate in FIG.
FIG. 8(B) is an enlarged front view of the main part of the figure, and is a sectional view taken along the line BB. 1...Case, 10...Side plate, 12...
・Latch receiver, 13...Trip crossbar 114・
...Claw, 15...To insulation- 15a...Slope, ■
6...Mounting bracket, 16a...Arm, 19...Pin,
24... crimping pin, 25... crimping hole. (A) (B) Figure (A) (B) Figure Figure Figure 5 Figure (A) Figure (B)

Claims (1)

[Claims] 1) Consisting of an insulating bar that spans each phase and a U-shaped mounting bracket connected to this insulating bar, the cable is connected via pins inserted into the left and right arms of this mounting bracket. A trip crossbar of a circuit breaker is rotatably supported by a side plate fixed to a case, and a claw formed on one arm of the mounting bracket engages with a latch receiver supported by the side plate, A caulking pin for connecting the mounting bracket is integrally formed on the insulating bar, and after the mounting bracket is supported by the side plate, the caulking pin is inserted into the caulking hole of the mounting bracket to deform its tip, and the A trip crossbar for a circuit breaker, characterized in that a mounting bracket is caulked to the insulating bar. 2) Consisting of an insulating bar spanning each phase and a U-shaped mounting bracket fixed to this insulating bar, the side panel is fixed to the case via pins inserted into the left and right arms of this mounting bracket. In a trip crossbar of a circuit breaker that is rotatably supported on a plate and in which a claw formed on one arm of the mounting bracket engages a latch receiver supported on the side plate, the insulating bar is connected to the side plate. A trip crossbar for a circuit breaker characterized by forming an inclined surface on which the tips of protruding pins rest.