JPH03119626A - Circuit breaker - Google Patents

Abstract

PURPOSE:To trip the latch body of a trip mechanism with a small force at the time of tripping by couplably coupling a rotatable latch receiver connected via an interlocking link pivotally connected to a switching action link mechanism with the latch body of the trip mechanism. CONSTITUTION:When the on-state is to be transferred to the off-state, an interlocking link 45 pivotally connected to a switching action link mechanism 14 and a latch receiver 42 pivotally connected to this interlocking link 45 are provided between the switching action link mechanism 14 of a switching mechanism 10 and the latch body 39 of a trip mechanism 30. The pressing force of the switching action link mechanism 14 holding the switching mechanism 10 in the closed state is dispersed to the interlocking link 45 and the latch receiver 42, the force applied to the latch body 39 is small, thus the latch body 39 of the trip mechanism 30 is operated with a small force by the application of the principle of lever at the time of tripping.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a circuit breaker, and more particularly, to a circuit breaker that reduces the operating force required to break a circuit in the event of an abnormality such as a current leakage.

(Prior Art) A conventional circuit breaker of this type has an operating mechanism, a fixed contact piece, and a movable contact piece that is moved toward and away from the fixed contact piece, and opens and closes via a link mechanism by operating the operating mechanism. a latch connected to an opening/closing link mechanism of the opening/closing mechanism, comprising an opening/closing mechanism that opens and closes the opening/closing mechanism; and a tripping mechanism that maintains the open state of the opening/closing mechanism and opens/closes the opening/closing mechanism in response to an abnormality; A structure was adopted in which the latch body was directly engaged with the tripping mechanism, and the force applied to the rotation link mechanism was received by the engagement portion between the latch body and the tripping mechanism.

(Problem to be Solved by the Invention) In the circuit breaker of the above conventional structure, the latch body connected to the opening/closing link mechanism of the opening/closing mechanism is directly engaged with the tripping mechanism, and the force applied to this link mechanism is absorbed by the latch body. Because the latch body is received by the engaging part of the latch and the tripping mechanism, a large force is required to trip the latch body in the event of an abnormality, and the driving force of the electromagnet of the tripping mechanism must be made larger than necessary. The problem is that the removal mechanism becomes large, and a large storage space is required to incorporate the removal mechanism, resulting in an overall increase in size.

The present invention has been made in view of the above-mentioned problems, and is capable of reducing the load on the latch body by dispersing the force applied to the latch body, and allows the circuit breaker to be assembled in a compact size by allowing the latch body to be detached with a small force when detaching the latch body. It provides equipment.

[Structure of the invention]

(Means for Solving the Problems) A circuit breaker of the present invention includes an operating mechanism, a fixed contact plate, and a movable contact plate that is brought into contact with and separated from the fixed contact plate, and a link mechanism that opens and closes by operating the operating mechanism. an opening/closing mechanism that is opened and closed via a latch body, and a tripping mechanism that maintains the closed state of the opening/closing mechanism and has a latch body that is disengaged in response to an abnormality and opens the opening/closing mechanism. The latch body of the tripping mechanism is releasably engaged with a rotatable latch receiver connected via an interlocking link pivotally connected to the opening/closing link mechanism.

(Function) The circuit breaker of the present invention has an interlocking link pivotally connected to the opening/closing link mechanism and a latch body of the tripping mechanism, and an interlocking link pivotally connected to the opening/closing link mechanism of the opening/closing mechanism and the latch body of the tripping mechanism. Because the connected latch receiver is interposed, the pressing force of the opening/closing link mechanism that holds the opening/closing mechanism in the closed state is dispersed between the link and the latch receiver, and the force applied to the latch is small, so the pulling force is reduced. At the time of release, the latch body of the release mechanism can be operated with a small force by applying the lever principle.

(Example) The configuration of an embodiment of the present invention will be described with reference to the drawings.

1 is an insulating base, and an opening/closing mechanism 10 is mounted on the top surface of this base 1.
, an operating mechanism 20 and a tripping mechanism 30 are provided.

The opening/closing mechanism 10 includes a plurality of fixed contact plates 11 fixed on the base 1, and is rotatably provided on the base plate 1 on a shaft 12 facing each of the fixed contact plates 11 upwardly, and It is composed of a plurality of movable contact plates 13 that are brought into contact with and separated from the contact plate 11, and an opening/closing operation link mechanism 14 that is rotatably connected to the shaft 12.

The opening/closing link mechanism 14 is composed of a first link 15 having one end pivotally connected to the shaft 12 and a second link 16 having one end pivotally connected to the other end of the first link 15. . The movable contact plate 13 is urged in a direction away from the fixed contact plate 11 by a spring means (not shown).

Next, the operating mechanism 20 has a handle 23 rotatably attached to a frame 21 provided on the base 1 with a shaft 22, and the opening/closing link 14 is attached to a protrusion 24 of the handle 23. The other end of the second link 16 is pivotally connected.

Further, the tripping mechanism 30 is rotatably supported by a shaft 34 on an electromagnetic coil 31 and a shaft support protrusion 33 protruding from the upper side of a magnetic frame 32 of the electromagnetic coil 31, and is attracted to the electromagnetic coil 31. an engaging portion 37 whose intermediate portion is rotatably attached to the frame 21 about a shaft 36 and whose one end is pressed by the armature 35;
, and a latch body 39 having a hook-shaped locking portion 38 at the other end. The latch body 39 is biased by a coil spring 40 in a direction in which the engaging portion 37 engages with the suppressing portion 41 of the armature 35 .

Reference numeral 42 denotes a latch receiver that is removably engaged with the latch body 39. The base end of the latch receiver 42 is rotatably connected to the frame 21 by a shaft 43, and the latch receiver 42 The tip of the receiver 42 is connected to the engaging portion 3 of the latch body 39.
7 is formed with an engaged portion 44 that is detachably engaged.

Further, an interlocking link 4 is provided in the middle part of the latch receiver 42.
5 is rotatably connected by a shaft 46, and the other end of this interlocking link 45 is connected to a pivot point of the first and second links 15, 16 of the opening/closing link mechanism 14 by a shaft 47. Rotatably connected.

Furthermore, the second sink 16 of the opening/closing link mechanism 14
A shaft 48, which pivotally connects the protrusion 24 of the handle 23 of the operating mechanism 2G, is engaged with a regulating edge 49 formed on the frame 21, and its position is regulated.

Further, on the base 1, there is a power side terminal plate 51 which is integrally connected to the fixed contact plate 11, a load side terminal plate 52 which is electrically connected to the movable contact plate 13 and the electromagnetic coil 31.
and is provided.

Further, the frame 21, the magnetic frame 32 of the electromagnetic coil 31, and the terminal plates 51, 52 are fixed to the base 1 with screws 54.

Further, 65 is a cover attached to the base 1, and an opening 66 from which the handle 23 of the operating mechanism 20 projects is formed.

In addition, 60 in the figure is an arc short grid holder 61
This is an arc short grid installed within the arc.

Next, the operation of the embodiment will be explained.

When the handle 23 of the operating mechanism 20 is rotated counterclockwise from the state shown by the two-dot chain line in FIG. 2 to the state shown in FIG.
The engaged portion 44 of the latch receiver 42, which is pivotally connected via the interlocking link 45 connected to the pivot portion of the second link 15, 16, is connected to the locking portion 38 of the latch body 39 of the detaching mechanism , the first and second links 1
5.16 has a substantially linear shape, and the movable contact plate 13 pivotally attached to this first link 15 is pressed downward, and this movable contact plate 13 is brought into contact with the fixed contact plate 11 against the spring means. The terminal board 51 and 52 are kept in the on state, and conduction is established between the terminal plates 51 and 52. In this state, when an overcurrent flows through the electromagnetic coil 31 in the event of an abnormality, a time delay characteristic occurs due to the viscosity of the oil in the relationship between the upward electromagnetic force received by the plunger in the oil case 31 and the spring in the oil case 3Is. The plunger rises while holding the iron core 31b1, a magnetic circuit of the plunger, the magnetic frame 32, and the armature 35 is formed, and the armature 35 connects the iron core 31! of the electromagnetic coil 31. The pressing portion 41 of the armature 35 suppresses and rotates the latch body 39 against the spring force of the coil spring 40, and the latch body 39 is rotated counterclockwise as shown in FIG.
As shown by the dashed line in the drawing, the locking part 38 releases the locking of the engaged part 44 of the latch receiver 42, and the movable contact plate 13 is rotated clockwise in the drawing by a spring means (not shown). Then, the movable contact plate 13 is separated from the fixed contact plate 11, and becomes in an OFF state.

When the ON state is switched to the OFF state, an interlocking link 45 pivotally connected to the opening/closing link mechanism 14 is inserted between the opening/closing link mechanism 14 of the opening/closing mechanism 10 and the latch body 39 of the tripping mechanism 30. Since the latch receiver 42 pivotally connected to this interlocking link 45 is interposed,
The pressing force of the opening/closing operation link mechanism 14 that holds the opening/closing mechanism 10 in the open state is distributed between the connecting link 45 and the latch receiver 42, and the force applied to the latch body 39 is small.
At the time of tripping, the latch body 39 of the tripping mechanism 30 is actuated with a small force by applying the lever principle. When setting the off state to the on state, the handle 23 of the operating mechanism 20 is rotated clockwise as shown in FIG. 1 to change from the one-dot chain line shown in FIG. As shown, the opening/closing link mechanism I4 is made substantially linear, and the latch receiver 42 is moved via the interlocking link 45 to a position where the engaged portion 44 is engaged with the locking portion 38 of the latch body 39. , the engaged portion 44 of the latch receiver 42 is engaged with the locking portion 38 of the latch body 39. Furthermore, in order to turn the ON state into the OFF state, when the handle 23 of the operating mechanism 20 is rotated clockwise from the state shown in FIG. Connected opening/closing link mechanism 1
The second link 16 of 4 is attracted and the first link 1
5, the movable contact plate 13 is pulled towards the movable contact plate 13 and separated from the fixed contact plate 11.

The armature 35 is a latch body 39 that is biased by a spring device or coil spring 4G (not shown).
It is urged in the direction away from the iron core 311 by the pressing force of the engaging portion 37 .

〔Effect of the invention〕

According to the present invention, since the latch body of the tripping mechanism is removably engaged with the rotatable latch receiver connected via the interlocking link pivotally connected to the opening/closing link mechanism, the opening/closing mechanism The pressing force of the opening/closing link mechanism that holds the latch in the closed state is distributed between the connecting link and the latch receiving body, reducing the load applied to the latch body. The body can be actuated with a small force, the tripping force of the tripping mechanism can be made small, the tripping mechanism can be made small, and the whole can be assembled compactly.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of a circuit breaker showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional side view showing the circuit breaker in a tripped state and an OFF state. DESCRIPTION OF SYMBOLS 10... Opening/closing mechanism, 11... Fixed contact plate, 13... Movable contact plate, 14... Opening/closing operation link mechanism, 20... Operating mechanism, 30... Tripping mechanism, 39... Latch body, 42...
- Latch receiver, 47 - Urn interlocking link.

Claims (1)

[Claims] (1) An opening/closing mechanism that includes an operating mechanism, a fixed contact plate, and a movable contact plate that comes into contact with and separates from the fixed contact plate, and is opened and closed via an opening/closing link mechanism by operation of the operating mechanism;
a tripping mechanism having a latch body that maintains the closed state of the opening/closing mechanism and is disengaged in response to an abnormality to open the opening/closing mechanism; A circuit breaker characterized in that the circuit breaker is removably engaged with a rotatable latch receiver connected via an interlocking link pivotally connected to an operating link mechanism.