JP5075015B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker, and more particularly to a structure of an opening / closing mechanism section interlocked with a handle.

  In the circuit breaker, the handle spring can be expanded and contracted by operating the handle, and the handle arm that performs the opening and closing operation has sufficient rigidity to withstand the load of the open and close spring, and can be securely connected to the handle to operate the handle. is necessary. Conventionally, as an example of the correspondence, the structure of the handle arm has a U-shaped structure, and has a structure in which a part where the opening / closing spring is applied and a part where the handle is connected are combined on the connected top surface.

Japanese Patent Laid-Open No. 10-125205 (FIGS. 1 and 2 and description thereof)

  In a conventional circuit breaker, the handle arm has a U-shape, and has a portion for applying an opening / closing spring on the top surface connected to the handle arm and a portion for connecting the operation handle to ensure rigidity during operation. There is. However, in the handle arm having the above-described structure, the opening / closing spring is arranged substantially parallel to the straight line connecting the rotation center of the handle arm and the handle connecting portion. However, there was a problem that it was necessary.

  The present invention has been made in view of the above circumstances, and an object thereof is to suppress the height dimension of a circuit breaker.

  A circuit breaker according to the present invention has a handle arm pivotally supported by a fixed portion and operated by a handle, and a first link and a second link pivotably connected to each other. A toggle link mechanism in which an opening / closing spring is stretched between a portion and the handle arm, a cross bar connected to the second link by a cross bar pin and rotated by the operation of the toggle link mechanism, a movable contact at one end And a movable contact that is pivotally supported by the crossbar and interlocked with the rotation of the crossbar, and a fixed contact having a fixed contact that contacts and separates from the movable contact. In the circuit breaker, the opening / closing spring hooking portion of the handle arm and the connection portion of the handle arm with the handle are located at positions separated from each other.

  The present invention includes a handle arm pivotally supported by a fixed portion and operated by a handle, a first link and a second link pivotably connected to each other, and the connecting portion and the handle arm. A toggle link mechanism in which an open / close spring is stretched between, a crossbar connected to the second link by a crossbar pin and rotated by the operation of the toggle link mechanism, a movable contact at one end and the other end A circuit breaker comprising: a movable contact that is pivotally supported by the crossbar and interlocked with the rotation of the crossbar; and a fixed contact that has a fixed contact that contacts and separates from the movable contact. The height of the circuit breaker is suppressed because the opening / closing spring hooking part of the handle arm and the connecting part of the handle arm are connected to each other. Rukoto can, it is possible to configure the circuit breaker compact.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS. 1 and 2 are side cross-sectional views showing a part of an example of an open / close mechanism of a circuit breaker in cross section. FIG. 1 shows a closed (on) state, and FIG. 2 shows an open (off) state. 3A and 3B are diagrams showing the main structure of the open / close mechanism in FIG. 1 in a closed state, where FIG. 3A is a side view, FIG. 3B is a bottom view, and FIG.

  In the circuit breaker according to the first embodiment, the opening / closing mechanism portion interlocked with the handle and the structure portion in the vicinity thereof are, as illustrated in FIG. 1 and FIG. Opening / closing spring 3, first link 4, second link 5, link pin 6, fixed frame 8, cross bar 9, movable contact 10, movable contact 10a, fixed contact 11, fixed contact 11a, cross bar pin 12 , Lever 13, latch 14, and base 15.

  1 and 2, the cross bar 9 formed of a synthetic resin material is rotatably supported by the fixed frame 8 attached to the base 15 formed of a synthetic resin material. The cross bar 9 may be configured to be rotatably supported on the base 15 itself.

  Inside the cross bar 9, the movable contact 10 having one end pivotally supported by the cross bar 9 is provided. The movable contact 10 rotates in conjunction with the cross bar 9 when the cross bar 9 rotates. The movable contact 10 has the movable contact 10a at the other end.

  The fixed contact 11 having the fixed contact 11a that contacts and separates from the movable contact 10a is mounted on the base 15.

  One end 5 a of the second link 5 is connected to the crossbar 9 by the crossbar pin 12.

  The other end 5 b of the second link 5 is connected to one end 4 a of the first link 4 by the link pin 6.

  The other end 4 b of the first link 4 is connected to the lever 13 engaged with the latch 14.

  The opening / closing spring 3 is stretched between the link pin 6 and the handle arm 1 interlocked with the handle 2 made of a synthetic resin material.

  The toggle link mechanism essential for the circuit breaker is composed of the second link 5, the first link 4, and the link pin 6, and the toggle mechanism is the toggle link mechanism of the above configuration and the opening / closing spring 3. It is configured.

  The handle arm 1 has a substantially T-shaped side surface, and a rotation center 1a of the handle arm 1 (a rotation center centered on an axis fixed to the fixed frame 8) is formed at the end of the leg on the base 15 side. ), A spring hooking portion 1c for hooking one end 3a of the opening / closing spring 3 on the end portion of one arm portion of the generally T-shaped handle arm 1, and a handle connecting portion 1b on the end portion of the other arm portion. , Each provided.

The side surface shape of the handle arm 1 may be a generally inverted L shape or a generally 7 character shape of Arabic numerals in addition to the generally T shape. In this case, the handle connecting portion 1b is connected to the bent portion, and the base 15 The rotation center 1a of the handle arm 1 may be provided at one end located on the side, and the spring hooking portion 1c may be provided at the other end.

  When the handle 2 is operated in the right direction on the drawing, the action line of the opening / closing spring 3 exceeds the dead point of the toggle link mechanism, so that the toggle link mechanism expands rapidly, as shown in FIG. Thus, the closed state of the circuit breaker can be maintained.

  When the handle 2 is operated in the left direction on the drawing sheet from the state shown in FIG. 1, the action line of the opening / closing spring 3 again exceeds the dead point of the toggle link mechanism, and the toggle link mechanism is bent. That is, the second link 5 pulls up the crossbar pin 12, and the crossbar 9 rotates counterclockwise on the drawing sheet, whereby the movable contact 10 is lifted. As shown, the movable contact 10a is separated from the fixed contact 11a, and the circuit breaker is opened.

  In FIG. 3 (a), a straight line 1a1b connecting the rotation center 1a of the handle arm 1 and the connection part 1b of the handle 2 is connected to a part 1c where the rotation center 1a of the handle arm 1 and the opening / closing spring 3 are hooked. It is almost orthogonal to the straight line 1a1c.

  Here, as shown in FIG. 3 (b), the handle arm 1 has a U-shape bent from the bottom side, and the opening / closing spring 3 is accommodated inside thereof. A spring hooking portion 1 c is formed on the U-shaped bottom of the handle arm 1 so as to hook the one end 3 a of the opening / closing spring 3. In addition, a connecting portion 1 b for connection to the handle 2 is formed at the U-shaped open end of the handle arm 1. Therefore, as shown in the perspective view of FIG. 3 (c), the handle connecting portion 1b of the handle arm 1 is inserted into the insertion hole 2a of the handle 2 in a state where both side plate portions of the handle arm 1 are bent. By adopting the structure, it is possible to maintain the rigidity when the handle is operated. With this structure, the link pin 6 connected to the other end 3b of the opening / closing spring is in the closed state as shown in the side view of FIG. The first link 4 and the second link 5 are arranged around the link pin 6 and the handle arm 1 is arranged near the center of rotation about the axis fixed to the fixed frame 8. It is arranged in a substantially vertical direction with respect to the straight line 1a1b connecting the rotation center 1a and the handle connecting portion 1b.

  In the closed state, as shown in the side views of FIGS. 1 and 3A, the first link 4 and the second link 5 that form a straight line around the link pin 6 are used. Is substantially perpendicular to the cross bar 9 and the movable contact 10 which are substantially linear. In other words, in the closed state, the first link 4 and the second link 5 that form a straight line with the link pin 6 as the center are the opening and closing directions of the movable contact 10a and the fixed contact 11a. They are almost parallel.

  Due to the link arrangement as described above, the first structure is provided because the open / close spring 3 is arranged substantially in parallel with the straight line connecting the connection portion 1b between the rotation center 1a of the handle arm 1 and the handle 2 in the closed state. The link 4 and the second link 5 are positioned substantially parallel to the straight line connecting the rotation center 1a of the handle arm 1 and the handle connecting portion 1b with the link pin 6 as the center). The space in the height direction occupied by the opening / closing mechanism is reduced, and the circuit breaker can be miniaturized.

  The first embodiment has the following characteristic points as illustrated in FIGS. 1 to 3.

A handle arm pivotally supported by a fixed portion and operated by a handle, and has a first link and a second link pivotably connected to each other, and between the connecting portion and the handle arm. A toggle link mechanism with an open / close spring stretched, a crossbar connected to the second link by a crossbar pin and rotated by the operation of the toggle link mechanism, a movable contact at one end and the other end being rotatable A circuit breaker having a movable contact that is pivotally supported by the crossbar and interlocked with the rotation of the crossbar, and a fixed contact that contacts and separates from the movable contact. A point where the opening / closing spring hooking portion of the arm and the connecting portion of the handle arm with the handle are located at a distance from each other.

  The opening / closing spring hooking portion of the handle arm and the handle connecting portion of the handle arm are separately arranged.

  The handle connection part of the handle arm and the opening / closing spring hook are so that the straight line connecting the rotation center of the handle arm and the connection part of the handle and the straight line connecting the rotation center of the handle arm and the part of the opening / closing spring are almost perpendicular to each other. The point where the part is arranged separately.

  The opening / closing spring is arranged in a substantially vertical direction with respect to a straight line connecting a rotation center of the handle arm and a connecting portion of the handle arm with the handle.

  The toggle link mechanism and the opening / closing spring are both disposed on the fixed contact side with respect to the cross bar and the movable contact.

  The middle part of the cross bar is located in the extending direction of the opening / closing spring in a state where the movable contact and the fixed contact are in contact.

  The shape seen from the bottom side of the handle arm is substantially U-shaped, one end of an open / close spring is attached to the bottom, and the handle is connected to the open end.

  The handle arm opening / closing spring hooking part is connected to form a substantially U-shaped handle arm, and the opening / closing spring is housed inside the handle arm, and the handle connecting part is bent on both side plates of the handle arm and inserted into the insertion hole of the handle. Intricate points.

Embodiment 2. FIG.
The second embodiment of the present invention will be described below with reference to FIG. 4A and 4B are diagrams showing another example of the structure of the main part in the closed state of the opening / closing mechanism, in which FIG. 4A is a side view, FIG. 4B is a bottom view, and FIG.

  In the second embodiment, in order to increase the rigidity of the handle connecting portion 1b of the handle arm 1, the handle connecting portion 1b is connected integrally as shown (the pair of side plate portions are connected integrally). ) It is structured to be inserted into the insertion hole 2a of the handle 2. Further, the end on the side opposite to the handle connecting portion 1b is opened, and the entire bottom surface shape (planar shape) of the handle arm 1 is formed into a substantially U-shape that can be bent and formed. A spring hook pin 7 is bridged across the paired side plate portions on the end opposite to the portion 1b, and the spring hook pin 7 is used as the closing spring hook portion 1c in the first embodiment. .

  In other words, the bottom portion of the U-shaped handle arm 1 is connected to the handle 2 and the connection portion 1b is inserted into the insertion hole 2a of the handle 2 so that the open end of the U-shaped handle arm 1 is opened. Is a spring hooking portion 1c for hooking one end 3a of the opening / closing spring 3.

  Also in the structure of the second embodiment, the space in the height direction occupied by the switching mechanism of the circuit breaker is reduced as in the first embodiment, and the circuit breaker can be reduced in size. .

  The second embodiment has the following characteristic points as illustrated in FIG.

  The shape seen from the bottom side of the handle arm is substantially U-shaped, one end of an open / close spring is attached to the open end, and the handle is attached to the bottom.

  A spring hook pin is added to the opening and closing spring hooking part of the handle arm, and both side plates of the handle arm are connected at the handle connecting part of the handle arm.

  1 to 4, the same reference numerals denote the same or corresponding parts in the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is a sectional side view which shows a part of example of the switching mechanism of a circuit breaker in a cross section, and has shown the closed circuit (on) state. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is a side sectional view which shows a part of example of the switching mechanism of a circuit breaker in a cross section, and has shown the open circuit (off) state. FIG. 2 is a diagram illustrating the first embodiment of the present invention, and is a diagram illustrating a main part structure in a closed state of the opening / closing mechanism in FIG. 1, (a) is a side view, (b) is a bottom view, (c) is a perspective view FIG. It is a figure which shows Embodiment 2 of this invention, and is a figure which shows the principal part structure in the closed state of an opening-and-closing mechanism part, The (a) is a side view, (b) is a bottom view, (c) is a perspective view. .

Explanation of symbols

1 Handle arm,
2 Handle,
3 Open / close spring,
4 First link,
5 Second link,
6 Link pin,
7 Spring hook pin,
8 fixed frame,
9 Crossbar,
10 movable contacts,
10a movable contact,
11 Fixed contact,
11a fixed contact,
12 Crossbar pin,
13 lever,
14 Latch,
15 base.

Claims (6)

A handle arm pivotally supported by a fixed portion and operated by a handle, and has a first link and a second link pivotably connected to each other, and between the connecting portion and the handle arm. A toggle link mechanism with an open / close spring stretched, a crossbar connected to the second link by a crossbar pin and rotated by the operation of the toggle link mechanism, a movable contact at one end and the other end being rotatable A circuit breaker including a movable contact that is pivotally supported by the crossbar and interlocks with the rotation of the crossbar, and a fixed contact that has a fixed contact that contacts and separates from the movable contact,
A circuit breaker in which an opening / closing spring hooking portion of the handle arm and a connection portion of the handle arm with the handle are located at a distance from each other.   2. The circuit breaker according to claim 1, wherein the opening and closing spring is arranged in a substantially vertical direction with respect to a straight line connecting a rotation center of the handle arm and a connection portion of the handle arm with the handle. Circuit breaker characterized by.   3. The circuit breaker according to claim 1, wherein the toggle link mechanism and the open / close spring are both disposed on the fixed contact side with respect to the cross bar and the movable contact. Feature circuit breaker. The circuit breaker according to any one of claims 1 to 3, wherein an intermediate portion of the crossbar is provided in an extending direction of the opening / closing spring in a state where the movable contact and the fixed contact are in contact with each other. Circuit breaker characterized by being located. The circuit breaker according to any one of claims 1 to 4, the shape as viewed from the bottom side of the handle arm is substantially U-shaped, one end of the closing spring is attached at its bottom, its open A circuit breaker, wherein the handle is attached to an end. In the circuit breaker according to any one of claims 1 to 4 , the shape of the handle arm as viewed from the bottom side is a substantially U shape, and one end of an open / close spring is attached to an open end portion thereof. A circuit breaker characterized in that the handle is attached to the bottom.

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