JP2004164953A - Switching mechanism of circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switching mechanism of a circuit breaker capable of keeping high durability without abnormally wearing a latch engaging with an operation link even if a U-shaped form of the operation link formed into the U-shaped form is deformed by machining failure or the like. <P>SOLUTION: This switching mechanism of a circuit breaker is equipped with: an operation handle 1 rotatably operated by using a handle shaft 2 as a fulcrum; the operation link 3 having one end 3a engaged with the operation handle 1 to transmit torque to the other end 3b; a latch 4 engaging with the other end 3b of the operation link 3 to receive the torque; and a moving element part 10 rotated by the torque received by the latch 4 by using a rotation shaft 6 as a fulcrum to separate a moving contact 8 from a fixed contact 9. A projection part 1d is installed on a tubular part 1c of an engagement hole 1b of the operation handle 1 for engaging the one end 3a of the operation link 3 with it to bring the one end 3a into contact with the tip of the projection part 1d. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mechanism for opening and closing a circuit breaker.
[0002]
[Prior art]
In the conventional opening / closing mechanism of a circuit breaker, when an operation handle is rotated, a latch interlocked with an operation link formed in a U-shape receives rotational power, and an arm and a movable element connected to the arm also rotate. Then, the movable contact is separated from the fixed contact. (For example, see FIG. 2 of Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-307613 A (FIG. 2 and its description).
[0004]
[Problems to be solved by the invention]
The opening / closing mechanism of the conventional circuit breaker is configured as described above. Therefore, if the U-shape of the U-shaped operation link is deformed due to poor machining or the like, the operation link and the latch engage. However, there is a problem that the load comes to a point contact, and the load is concentrated there, resulting in abnormal wear.
[0005]
The present invention has been made to solve such a problem, and an object of the present invention is to provide a circuit breaker switching mechanism capable of maintaining high durability without abnormal wear of a latch.
[0006]
[Means for Solving the Problems]
An opening / closing mechanism for a circuit breaker according to the present invention includes an operation handle pivotally operated around a handle shaft, an operation link having one end engaged with the operation handle and transmitting rotational power to the other end; A circuit comprising: a latch engaged with the other end of a link to receive a rotating power; and a mover portion configured to rotate about a rotation axis as a fulcrum to open a movable contact from a fixed contact by the rotating power received by the latch. In an opening / closing mechanism for a circuit breaker, a projection is provided on a tubular portion of an engagement hole of an operation handle with which one end of an operation link is engaged.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
1 is an external perspective view showing a mechanism configuration of a circuit breaker according to Embodiment 1 of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. It is BB sectional drawing.
[0008]
In the figure, when the operating handle 1 is rotated in the direction of arrow C (shown in FIG. 2) about the handle shaft 2 as a fulcrum, a substantially U-shaped engagement with an engagement hole 1b provided in the projection 1a is achieved. One end 3a of the operation link 3 rotates in the direction of arrow D, and the other end 3b of the operation link 3 transmits this turning power to the engaging portion 4a of the latch 4, and the arm 5 engaged with the latch 4 engages. It turns in the direction of arrow E with the turning shaft 6 pivotally supported by the hole 5a as a fulcrum.
[0009]
When the arm 5 rotates, the movable element 7 rotates in the direction of arrow F in conjunction with the arm 5, and the movable contact 8 fixed to the movable element 7 is separated from the fixed contact 9.
The arm 5 and the mover 7 rotate integrally with the latch 4 so as to rotate integrally. The arm 5 and the mover 7 are referred to as a mover section 10 here.
[0010]
In the above description, the protrusion 1d is provided on the cylindrical portion 1c (shown in FIG. 3) of the engagement hole 1b, and the protrusion is provided on the cylindrical portion 5b (shown in FIG. 4) of the engagement hole 5a. 5c is provided, and one end 3a and the rotating shaft 6 of the substantially U-shaped operation link 3 are in contact with the protruding portions 1d and the tips of the protruding portions 5c.
[0011]
According to the mechanism configuration of the circuit breaker of the first embodiment of the present invention configured as described above, one end 3a of the substantially U-shaped operation link 3 is formed by the protrusion of the cylindrical portion 1c of the engagement hole 1b. 1d, it is supported movably in the engagement hole 1b with the contact portion as a fulcrum, so that the U-shaped operation link 3 formed in a U-shape is deformed due to processing defects or the like. However, since the other end 3b of the operation link 3 is engaged along the engagement portion 4a of the latch 4, abnormal wear due to point contact does not occur.
[0012]
Further, since the rotating shaft 6 abuts on the tip of the projection 5c of the cylindrical portion 5b of the engagement hole 5a and is supported movably in the engagement hole 5a with this abutment as a fulcrum, a U-shape is provided. Even if the U-shape of the operation link 3 formed in the above is deformed due to processing defects or the like, the other end 3b of the operation link 3 is engaged along the engagement portion 4a of the latch 4, so that abnormal wear due to point contact occurs. Does not occur.
[0013]
In the above embodiment, the one end 3a of the operation link 3 is brought into contact with the tip of the projection 1d of the cylindrical portion 1c of the engagement hole 1b, and the operation link 3 can move freely in the engagement hole 1b with the contact portion as a fulcrum. And the rotating shaft 6 is brought into contact with the tip of the projection 5c of the cylindrical portion 5b of the engagement hole 5a, and the contact portion is supported movably in the engagement hole 5a with the contact portion as a fulcrum. By simply performing at least one of them, abnormal wear of the engaging portion 4a of the latch 4 can be prevented.
[0014]
【The invention's effect】
Since the present invention is configured as described above, it has the following effects.
[0015]
An operation handle pivotally operated around a handle shaft, an operation link having one end engaged with the operation handle and transmitting rotational power to the other end, and engaging with the other end of the operation link to receive rotational power One end of an operation link in an open / close mechanism of a circuit breaker having a latch and a movable part that rotates about a rotation axis as a fulcrum by a rotating force received by the latch to separate a movable contact from a fixed contact. One end of a substantially U-shaped operation link in which a projection is provided on the cylindrical portion of the engagement hole of the operation handle with which the projection engages with the tip of the projection of the cylindrical portion of the engagement hole. Since the operation link is supported movably in the engagement hole with the contact portion as a fulcrum, even if the U-shape of the U-shaped operation link is deformed due to processing defects or the like, the other end of the operation link is not latched. Since there is no point contact with the engaging part, the load is concentrated. No abnormality wear due to, it is possible to provide an opening and closing mechanism of the circuit breaker to maintain high durability.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing a mechanism configuration of a circuit breaker according to Embodiment 1 of the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is a sectional view taken along line AA of FIG. 2;
FIG. 4 is a sectional view taken along line BB of FIG. 2;
[Explanation of symbols]
1 operation handle, 1a protrusion, 1b engagement hole, 1c cylindrical part, 1d, projection, 2 handle shaft, 3 operation link, 3a one end, 3b other end, 4 latch, 4a engagement portion, 5 arm, 5a engagement hole, 5b cylindrical portion, 5c protrusion,
6 rotating shaft, 7 mover, 8 movable contact, 9 fixed contact, 10 mover part.

Claims (3)

An operation handle that is turned around a handle shaft,
An operation link having one end engaged with the operation handle and transmitting rotational power to the other end;
A latch that engages with the other end of the operation link and receives the rotational power;
A circuit breaker provided with a movable element for rotating the movable contact about a pivot point to separate the movable contact from the fixed contact by the rotating force received by the latch;
An opening / closing mechanism for a circuit breaker, wherein a projection is provided on a cylindrical portion of an engagement hole of an operation handle with which one end of the operation link is engaged. An operation handle that is turned around a handle shaft,
An operation link having one end engaged with the operation handle and transmitting rotational power to the other end;
A latch that engages with the other end of the operation link and receives the rotational power;
A circuit breaker provided with a movable element for rotating the movable contact about a pivot point to separate the movable contact from the fixed contact by the rotating force received by the latch;
An opening / closing mechanism for a circuit breaker, wherein a protrusion is provided on a cylindrical portion of an engagement hole of the movable member with which the rotating shaft is engaged. 3. The opening / closing mechanism for a circuit breaker according to claim 2, wherein a projection is provided on a cylindrical portion of an engagement hole of the operation handle with which one end of the operation link is engaged.

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