JPS6381721A - Overcurrent breaker - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field] It is something.

[Background Art J] As this type of overcurrent circuit breaker, the present inventors have developed W [1986-
120648, as shown in Figure @6, the sliding member A for driving the contact spring is in contact with r
:f, the sliding rotary body 32 that presses the spring 31, the luff lever 34 that engages with the bimetal piece 33 and latches the sliding rotary body 32, and the sliding rotary body 32! 35, and a push button part 36 which moves in the front and back direction, and since these parts were separate from each other, there was still a drawback that the structure was complicated and the number of parts was large.

[Object of the Invention] An object of the present invention is to provide an overcurrent circuit breaker with a simpler structure by integrating the above-mentioned separate components.

[Disclosure of the Invention] The overcurrent circuit breaker according to the present invention has a sliding member whose rear end is a push button portion that can freely protrude outside the case.
The sliding body is pivoted so that it can slide back and forth and move up and down, and a spring is provided to bias the sliding body backward. A contact spring tilted forward is disposed below the contact spring, and the contact is closed when the sliding body moves forward, and the sliding body rotates upward due to the reaction force from the contact spring and returns backward using the spring.
A locking protrusion that protrudes from the tip of a bimetallic piece disposed in a vertical plane parallel to the sliding body and withdraws from the top surface of the sliding body when the bimetallic piece bends due to overcurrent, and a stepped portion formed on the top surface of the sliding body. The push button part and the sliding rotating body in the conventional example can be integrated by giving the sliding body the freedom to slide back and forth and rotate up and down through the horizontal shaft and long hole. By arranging the plate surface of the bimetal piece parallel to the rotating surface of the sliding body, the bimetal piece is not affected by the rotational force of the contact spring and the latch load is stabilized. The feature is that the lever is omitted.

"Embodiment" Figures 1 to 3 show an embodiment of the present invention, in which the rear end of the sliding body 1 is a push button part 1a that can be pressed from the outside of the case 5; A long hole 2 is provided in the middle of the moving body 1, and the sliding body 1 is pivotally supported by a horizontal shaft 3 inserted through the long hole 2 so as to be freely slidable back and forth and vertically movable. FIG. 1 shows the latched state in which the push button part 1a is pushed into the case 5 against the spring 4 that urges the sliding body 1 backward, and the contact spring 6 whose front side is tilted upward is in the latched state.
The contact spring 651 is disposed below the contact spring 651 and is pressed downward as the sliding body 1 moves forward to close the contacts 13 and 14. The rotation to and the return to the rear by spring 4,
It is locked by a locking protrusion 8 provided at the tip of the bimetal shell 7. The bimetal piece 7 is disposed in a vertical plane parallel to the sliding body 1, and its plate surface is parallel to the rotating surface of the sliding body 1, and the locking protrusion 8 is caused by thermal deformation of the bimetal piece 7 due to overcurrent. When the slide body 1 retreats to the side, the engagement state, that is, the latched state, with the locking protrusion 8 is released, and the sliding body 1 rotates upward and slides backward, shifting to the trip state shown in Fig. 153, and the contact point The spring 6 is returned to its original position.

In FIG. 2, the support fittings 9 have mounting holes 9g and 9b.
It is fixed to the case 5 by the contact spring fixing piece 9.
The contact spring 6 is fixed to c, the bimetal piece 7 is fixed to the bimetal fixing piece 9d, and one end of the spring 4 is fixed to the spring engagement piece 9e.

The other end of the spring 4 is engaged with a spring engaging pin 10 that projects from the side surface of the sliding body 1, and biases the sliding body 1 diagonally downward. The card portion 11 is brought into elastic contact with the upper surface of the contact spring 6.

! Figure #3 shows a tripped state, in which the sliding body 1 disengages the step 12 provided on its top surface and the locking protrusion 8 of the bimetal piece 7, and retreats due to the restoring force of the spring 4. As a result, the push button portion 1a at the rear end protrudes outward from the case 5, and since the sliding body 1 is urged downward by the spring 4, its tip end engages with the locking protrusion 8 of the bimetal piece 7. This is the first one that is located at the bottom of the page.
When the push button portion 1a is pushed in, the locking protrusion 8 comes into sliding contact with the slope 1b on the top surface of the tip of the sliding body 1, and then the step portion 12
The sliding body 1 is latched, resulting in the state shown in FIG. 1(a).

As described above, in the latched state shown in FIG. 12
However, even if some obstacle prevents the push button portion 1a from protruding out of the case 5, the circuit will be interrupted by a trip. It has a trip-free structure.

That is, when the bimetallic piece 7 is heated by the overcurrent and curves in the direction of the arrow in FIG. 11(a), and the contact spring 6 returns to contact as shown in FIG. 11(a) and opens α13, 14, thereby breaking the circuit. Note that the rotation angle of the sliding body 1 at this time is regulated by the engagement between the step portion 15 on the side surface of the tip end of the sliding body 1 and the locking protrusion 8 .

Further, as shown in FIG. 1(b) and FIG. 2, in order to place the sliding body 1 adjacent to the bimetal piece 7, the bimetal piece 7 and the indirect heater (resistor) 16 are prevented from coming into contact with each other. A heater 16 is provided in a through hole 17 in the bimetal piece 7.
The terminal plate 18 and the supporting metal 9 are connected to each other at both ends thereof. Further, each end of the terminal plate 18 and the terminal plate 19 provided with g 14 after being fixed protrudes from the front surface of the case 5 to serve as an insertion plug.

FIG. 5 shows the structure of the card part 11 protruding from the lower surface of the sliding body 1. A protrusion 20 is provided at the center of the semi-cylindrical card part 11, and this protrusion 20 is connected to the contact spring 6. established in
By inserting the sliding body 1 into the idle groove 21, the horizontal rotation of the sliding body 1 is restricted. Note that the width of the rear introduction portion 21g of the idle groove 21 is slightly wider.

[Effect of the invention 1] In the above-mentioned configuration, the sliding body 1 is designed to be movable back and forth and up and down by the elongated hole 2 and the horizontal shaft 3, so that the sliding rotating body in the conventional example shown in FIG. 32 and push button part 3
6, and by arranging the bimetal piece 7 in a vertical plane parallel to the sliding body 1, the locking protrusion 8 provided at the tip of the bimetal piece 7 can be integrated with the rotating surface of the sliding body 1. Since the contact spring 6 is applied to the bimetallic piece 7 via the sliding body 1,
The spring force is parallel to the plate surface of the bimetallic piece 7 and has almost no effect on the operation of the bimetallic piece 7. Therefore, even if the latch lever 34 in the conventional example is omitted, the latch load can be stabilized. , 9 losses can be saved and the structure can be significantly simplified.

[Brief explanation of the drawing]

FIG. 1(a) is a side view showing an embodiment of the overcurrent breaker of the present invention, FIG. 1(b) is a plan sectional view of the same, FIG. 2 is an exploded perspective view of the same, and FIG. 3 is a trip state of the same. Side view shown, 4th
The figure is a side view of the main part showing the trip 717 state as above, FIG. 5 is a perspective view of the main part same as above, and FIG. 6 is a side view of the conventional example. DESCRIPTION OF SYMBOLS 1...Sliding body, 1a...Push button part, 2...Long hole, 3
...Horizontal axis, 4...Spring, 5...Case,
6... Contact spring, 7... Bimetal piece, 8... Locking protrusion, 12... Step portion.

Claims (1)

[Claims] (1) A long hole is provided in the middle of the sliding body whose rear end is a push button that can freely protrude outside the case, and a horizontal shaft inserted through the long hole allows the sliding body to slide back and forth and move up and down. A spring is provided that supports the sliding body and urges the sliding body backward, and a contact spring that is tilted forward and upward is disposed below the sliding body, so that the contact is closed as the sliding body moves forward, and the contact spring of the sliding body is The upward rotation due to the reaction force and the backward return due to the spring are protruded from the tip of a bimetal piece placed in a vertical plane parallel to the sliding body, and the bimetal piece is bent by an overcurrent and exits from the top surface of the sliding body. An overcurrent circuit breaker that is locked by engagement between a locking protrusion and a step formed on the upper surface of the sliding body.