CN104756219B - Circuit-breaker and the assemble method of circuit-breaker - Google Patents

Abstract

The invention provides a circuit breaker and a method for assembling the circuit breaker. The trip button (22) includes: a button part (22b) arranged on the top of the button body (22a); The portion between the button portion and the engaging portion of the button body is provided as a shaft portion (the wire (26a) of the torsion spring (26)) whose axis line extends in a direction perpendicular to the pressing direction of the button portion. Furthermore, when the button part is pushed down, the button main body turns around the said shaft part, and it is comprised so that the engaging part may apply thrust to a trip bar. Furthermore, the switch mechanism part (20) (side plate (23a)) has the bearing hole (25) which supports the shaft part (26a) of a trip button.

Description

Circuit breaker and method of assembling the circuit breaker

technical field

The present invention relates to a circuit breaker for wiring, a circuit breaker, and the like, and an assembly method of the circuit breaker. Specifically, it relates to a structure of a trip button provided in the circuit breaker.

Background technique

In the circuit breaker, there is a device equipped with a test button called a "trip button" in order to test whether the trip operation of the circuit breaker is working normally at any time. By manually pressing the operation trip button from the outside, the lock mechanism is activated. Release to open the main circuit contacts.

Figure 5 shows the interior of a circuit breaker with a trip button.

The symbol 1 in Fig. 5 is the handle that can manually perform on/off operation of the circuit breaker, the symbol 2 is the handle rod, the symbol 3 is the locking mechanism that is connected with the handle rod 2 and participates in the tripping action, and the symbol 4 is the The lock mechanism 3 and the toggle mechanism 5 are freely rotatably connected and have a movable contact 4A. The symbol 6 is a movable contact that rotates around the pin 6A and is released from the lock mechanism through the trip lever 7 when the overcurrent trips. The engagement state of 3, the cross bar that makes the toggle mechanism 5 perform the circuit breaking action, the symbol 8 is the opening and closing spring, and the symbol 9 is attracted by the electromagnetic force generated in the electromagnetic trip part 10 when the overcurrent occurs, so that the cross bar 6 An armature turning in the direction of the arrow. In addition, reference numeral 11 is a fixed contact having a fixed contact 11A.

Furthermore, a trip button 13 is provided in the housing 12 . By pressing the trip button 13 against the elastic force of the coil spring 14, the engagement state between the lock mechanism 3 and the trip lever 7 is released, and the movable contact 4 is turned off, so that no overcurrent actually flows. Whether the tripping action is normal.

prior art literature

patent documents

Patent Document 1: Japanese Utility Model Publication No. 3-20854 (Fig. 1)

Contents of the invention

However, in the circuit breaker of the above-mentioned Patent Document 1, a stopper (not shown) that restricts the pressing position of the trip button 13 in the direction in which the trip button 13 is pressed protrudes from the inner wall of the housing 12, and a retaining roll. For the cylindrical spring guide part 15 of the spring 14, it is necessary to consider the size of these stoppers (limiting parts), the size of the spring guide part 15, and the stroke of the trip button 13, so that the inner volume of the frame body 12 is designed to be relatively large. There is a problem with the transformation.

In addition, since the stopper, the spring guide 15, and the like are provided on the inner wall of the frame body 12, the shape of the frame body 12 becomes complicated, and there is a problem in terms of manufacturing cost.

In addition, the frame body 12 is formed by connecting a plurality of divided bodies with fastening screws, but due to the influence of the fastening force of the fastening screws, the frame body 12 is deformed, and the deformation of the frame body 12 affects the spring guide portion 15 and damages the trip button. 13 possibilities of action reliability.

Therefore, an object of the present invention is to provide a circuit breaker and a method of assembling the circuit breaker, which can achieve reduction in manufacturing cost and miniaturization even if a trip button is provided.

means to solve the problem

In order to achieve the above objects, a circuit breaker according to an aspect of the present invention is equipped with: a fixed contact provided with a fixed contact; a movable contact provided with a movable contact that contacts the fixed contact; contact; the opening and closing mechanism part connected with the movable contact; and the trip cross bar that makes the above opening and closing mechanism part perform a trip action by being pressed. A trip button is arranged on the outer surface of the above frame, and the The pressing action of the button presses the above-mentioned trip bar. The above-mentioned trip button includes: a button part arranged on the top of the button body; The portion between the button portion and the engaging portion of the button body is provided as a shaft portion whose axis line extends in a direction perpendicular to the pressing direction of the button portion, and is configured so that when the button portion is pressed down, the button The main body rotates around the shaft so that the engaging portion pushes the trip bar, and the opening and closing mechanism has a bearing hole for supporting the shaft of the trip button.

According to the circuit breaker according to one aspect of the present invention, the housing can have a simple structure without forming a member holding the trip button in the housing as in the conventional device, so that the manufacturing cost can be reduced. In addition, even if the frame formed by connecting a plurality of divided bodies with the connecting screw is deformed by the fastening force of the connecting screw, the trip button of the present invention is not connected to the frame, and the operation reliability is not lowered.

In addition, in the circuit breaker according to one aspect of the present invention, the shaft portion of the trip button is a spring member that can be elastically deformed freely, and when the button body is rotated by pressing the button portion, a restoring elastic force is exerted to make the button body rotate. The function of the button body returning to its original position.

According to the circuit breaker of one aspect of the present invention, since the shaft portion of the trip button also functions as a return spring, it is possible to reduce the number of components.

In addition, in the circuit breaker according to one aspect of the present invention, the shaft portion of the trip button is a torsion spring having a pair of parallel wires bent in a substantially U shape, and one wire of the torsion spring is locked to the switch. As for a part of the mechanism part, the other wire rod is inserted into the bearing hole of the switch mechanism part.

According to the circuit breaker of one aspect of the present invention, the torsion spring can support the trip button and apply a restoring elastic force.

On the other hand, according to a method of assembling a circuit breaker according to an aspect of the present invention, in the above-mentioned circuit breaker, a fixed contact provided with a fixed contact and a contact with the fixed contact are mounted inside the housing. The movable contact of the movable contact; the opening and closing mechanism part connected with the movable contact; A trip button is provided, and the trip bar is pressed by pressing the trip button. The circuit breaker assembly method is used to assemble the trip button to the opening and closing mechanism. The trip button includes: The button part on the top of the main body; the engaging part provided on the above-mentioned button main body that can be engaged with the above-mentioned trip bar; A shaft insertion hole extending in a direction perpendicular to the pressing direction of the button portion, the opening and closing mechanism portion includes a pair of side plates and a top plate positioned on top of the pair of side plates, and one side plate has a Through the bearing hole, the above-mentioned trip button is arranged in such a manner that the above-mentioned shaft insertion hole corresponds to the above-mentioned bearing hole of the above-mentioned side plate, and then the torsion spring with a pair of wires that are bent into a substantially U shape and is parallel to each other is placed on one side. The wire rod is attached to a part of the top plate, and the other wire rod is inserted into the bearing hole of the side plate and the shaft insertion hole of the trip button.

According to the method of assembling a circuit breaker according to one aspect of the present invention, the trip button can be easily assembled to the switching mechanism section using a substantially U-shaped torsion spring without using tools such as a screwdriver.

Invention effect

According to the circuit breaker and the method of assembling the circuit breaker of the present invention, it is possible to reduce the manufacturing cost, reduce the number of parts, and achieve miniaturization.

Description of drawings

Fig. 1 is a perspective view showing main parts of an opening and closing mechanism unit of a circuit breaker according to the present invention.

Fig. 2 is a side view showing a main part of a switching mechanism unit of the circuit breaker according to the present invention.

Fig. 3 shows the assembly flow for assembling the trip button to the switch mechanism.

Fig. 4 is a diagram showing the structure and pressing operation of the trip button.

Fig. 5 is a cross-sectional view showing a conventional circuit breaker provided with a trip button.

detailed description

Hereinafter, modes for implementing the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. However, the same reference numerals are assigned to the same components as those shown in FIG. 5 and descriptions thereof will be omitted.

1 is a perspective view showing main parts of a circuit breaker for three-pole wiring according to the present invention, showing a switch mechanism 20 , a trip rail 21 and a trip button 22 mounted inside a housing 12 . 2 is a side view showing the main part of FIG. 1, FIG. 3 shows the assembly of the trip button 22 to the switch mechanism 20, and FIG.

As shown in Figure 1, the opening and closing mechanism part 20 includes a locking mechanism (latch button mechanism) 3 and a toggle mechanism 5 (referring to Figure 5) that are connected to the handle bar 2 and participate in the tripping action. A pair of side plates 23a, 23b arranged parallel to each other, and a top plate 24 connected to the upper parts of the pair of side plates 23a, 23b are disposed around the surrounding area.

An opening 24 a is formed in the top plate 24 . The opening 24a includes: a long opening extending toward the pair of side plates 23a and 23b; and a short opening extending continuously from the side plate 23a side of the long opening to form an L-shape.

In addition, a bearing hole 25 is formed through the side plate 23a in the vicinity of the short opening portion of the opening portion 24a of the top plate 24 in the thickness direction.

The trip rail 21 is a member in which a trip portion 21b is integrally formed at three places in the longitudinal direction of the rod body 21a. As shown in FIG. 1, the shaft portion is supported by a pair of side plates 23a, Between 23b. In addition, in FIG. 2, the code|symbol 21c has shown the position of the axial part of the said trip bar 21. As shown in FIG.

The trip button 22, as shown in FIG. 3 , is provided with a button body 22a, a button portion 22b provided on the top of the button body 22a, an engaging convex portion 22c provided at the lower portion of the button body 22a, and an engaging convex portion between the button portion 22b and the engaging convex portion. The member of the shaft insertion hole 22d penetratingly provided between the parts 22c in the thickness direction.

In addition, the trip button 22 is arranged on the lower surface side of the top plate 24 as shown in FIG. 22d.

The torsion spring 26 is, as shown in FIG. 3 , an elastic member bent into a substantially U-shape and provided with a pair of wires 26a, 26b parallel to each other.

One wire 26a of the torsion spring 26 is a member inserted through the bearing hole 25 and the shaft insertion hole 22d, and the other wire 26b extends along the edge of the opening 24a as shown in FIG. The portion 26b1 is hooked and engaged with the upper surface of the top plate 24 .

In this way, the trip button 22 supported by the switch mechanism part 20 (side plate 23a and top plate 24) via the torsion spring 26, as shown in FIG. The engaging convex part 22c protrudes outward and is arrange|positioned in the housing|casing 12 in the state which opposed the trip part 21b of the trip rail 21. As shown in FIG.

As shown in FIG. 4( a), when viewed from the side, the engaging protrusion 22c is located below the shaft insertion hole 22d, the button portion 22b is located above the shaft insertion hole 22d, and is arranged on the left and right relative to the shaft insertion hole 22d. When the trip button 22 that engages the convex portion 22c and the button portion 22b is downwardly applied to the button portion 22b, it is converted into a rotation of the button body 22a around the shaft insertion hole 22d.

Then, as shown in FIG. 4( b ), when a pressing force is applied to the button portion 22b, in the torsion spring 26, the wire 26a inserted in one of the bearing hole 25 and the shaft insertion hole 22d and the wire 26a along the opening 24a The other wire 26b extending from the edge of the opening and having the end 26b1 hooked and engaged with the upper surface of the top plate 24 is twisted and deformed so that the distance between each other expands in a figure-eight shape. At this time, the button main body 22a rotates around the shaft insertion hole 22d while moving downward, and the engaging convex portion 22c applies a pressing force to the trip portion 21b of the trip bar 21 . Thereby, the trip rail 21 rotates in the direction of the arrow about the shaft 21c, and the movable contact 4 is opened by the latch mechanism 3 and the toggle mechanism 5 of the switch mechanism unit 20 .

Here, when the pressing force of the button portion 22 is released, the torsionally deformed torsion spring 26 applies a restoring elastic force to the button main body 22a to return the pair of wires 26a, 26b to the original shape parallel to each other (indicated by the arrow direction of symbol S). shown resilience). The trip button 22 to which the restoring elastic force S of the torsion spring 26 is applied moves to the original position in FIG. 4( a ).

In addition, the engaging part of this invention corresponds to the engaging convex part 22c, and the shaft part of this invention corresponds to the torsion spring 26 and the wire 26a.

Next, in the circuit breaker of this embodiment, the flow of assembling the trip button 22 on the side plate 23 a and the top plate 24 arranged around the switch mechanism part 20 will be described with reference to FIG. 3 .

First, as shown by the arrow A in FIG. 3 , the trip button 22 is raised from the lower side of the side plate 24 and the trip button 22 is moved until the upper part of the button body 22 a is positioned at the opening 24 a of the top plate 24 .

Then, the shaft insertion hole 22d of the trip button 22 is made to correspond to the bearing hole 25 of the side plate 23a.

Next, as shown by the arrow B in FIG. 3 , the torsion spring 26 is moved to the upper part of the side plate 23a, the one wire 26a is inserted into the bearing hole 25 and the shaft insertion hole 22d, and the other wire 26b is inserted along the opening. The edge portion of the opening of the portion 24a is extended so that the end portion 26b1 is hooked and engaged with the upper surface of the top plate 24 .

Thereby, assembly of the trip button 22 to the side plate 23a and the top plate 24 is completed.

Next, operations and effects of the circuit breaker of the present embodiment will be described.

In the circuit breaker of this embodiment, the parts supporting the trip button 22 are the side plates 23a, 23b and the top plate 24 of the switch mechanism part 20, instead of forming a part holding the trip button in the frame 12 as in the conventional device, it can Since the frame body 12 has a simple structure, it is possible to reduce the manufacturing cost.

In addition, even if the frame body 12 in which a plurality of split bodies are connected by fastening screws is deformed due to the influence of fastening force such as fastening screws, the trip button 22 of this embodiment is not connected to the frame body 12 but is controlled by the opening and closing mechanism. Since the side plates 23a, 23b and the top plate 24 of the part 20 are supported, the operational reliability will not be lowered.

In addition, the trip button 22 is a mechanism that rotates around the shaft insertion hole 22d provided substantially in the center of the button body 22a, and the operation stroke of the trip button 22 is small, so that the circuit breaker can be miniaturized.

In addition, the member that rotatably supports the trip button 22 on the side plate 23a and the top plate 24 is a torsion spring 26, and this torsion spring 26 applies a restoring elastic force S for returning the pressed trip button 22 to its original position. Since the function of supporting the trip button 22 and the function as a return spring member can be suppressed, an increase in the number of parts can be suppressed.

Furthermore, in order to assemble the trip button 22 on the side plate 23a and the top plate 24 of the opening and closing mechanism part 20, the trip button 22 is arranged on the lower side of the top plate 24, and then the shaft insertion hole 22d of the trip button 22 is inserted into the side plate 23a. The bearing hole 25 corresponds, and then, one wire 26a of the substantially U-shaped torsion spring 26 is inserted into the bearing hole 25 and the shaft insertion hole 22d, and the other wire 26b of the torsion spring 26 is inserted along the opening 24a. The edge portion of the opening is extended so that the end portion 26b1 is hooked and engaged with the upper surface of the top plate 24, thereby completing the assembly of the trip button 22 . In this way, the trip button 22 can be easily assembled to the side plate 23a and the top plate 24 using the substantially U-shaped torsion spring 26 without using tools such as a screwdriver.

Industrial Utilization Possibility

As described above, the circuit breaker and the method of assembling the circuit breaker according to the present invention are useful for achieving downsizing while reducing manufacturing costs even if a trip button is provided.

Symbol Description

1...handle, 2...handle rod, 3...locking mechanism, 4...movable contact, 5...toggle mechanism, 12...frame, 12a...button hole, 20...opening and closing Mechanism part, 21...trip crossbar, 21a...rod main body, 21b...trip section, 21c...shaft, 22...trip button, 22a...button body, 22b...button part, 22c...engagement Convex part, 22d... shaft insertion hole, 23a, 23b... side plate, 24... top plate, 24a... opening, 25... bearing hole, 26... torsion spring, 26a, 26b... wire rod, 26b1... …the end of the wire.

Claims (4)

1. a kind of circuit-breaker, it is equipped with the inside of framework：It is provided with the fixed contact of fixed contact；It is provided with and institute State the movable contact of the moving contact of fixed contact contact；The open-close mechanism section being connected with this movable contact；With by being pressed Press the tripping operation cross bar making described open-close mechanism section carry out trip operation, arrange trip button in the outer surface of described framework, Push action is carried out to described tripping operation cross bar by the action of pressing of this trip button, described circuit-breaker is characterised by：

Described trip button includes：It is arranged on the button portion at the top of button body；Be arranged on described button body can be with The holding section of described tripping operation cross bar engaging；Position and the described button portion positioned at described button body and described holding section between And be arranged to axis with described button portion press the upwardly extending axle portion in the orthogonal side in direction, be configured to described by pressing Button portion makes described button body rotate around described axle portion and make described holding section apply the knot of thrust to described tripping operation cross bar Structure,

Described open-close mechanism section has the dead eye of the axle portion supporting described trip button,

The axle portion of described trip button is can freely to carry out the spring members of elastic deformation, is made by pressing described button portion When described button body there occurs rotation, restitutive force plays the effect making described button body return-to-home position.

2. circuit-breaker as claimed in claim 1 it is characterised in that：

The axle portion of described trip button is to bend to the torsion spring with a pair of wire rod being parallel to each other of generally U-shaped shape, this torsion spring The wire rod of a side be locked in the part of described open-close mechanism section, the wire rod of the opposing party is inserted in described open-close mechanism section In described dead eye.

3. a kind of circuit-breaker, it is equipped with the inside of framework：It is provided with the fixed contact of fixed contact；It is provided with and institute State the movable contact of the moving contact of fixed contact contact；The open-close mechanism section being connected with this movable contact；With by being pressed Press the tripping operation cross bar making described open-close mechanism section carry out trip operation, arrange trip button in the outer surface of described framework, Push action is carried out to described tripping operation cross bar by the action of pressing of this trip button, described circuit-breaker is characterised by：

Described trip button includes：It is arranged on the button portion at the top of button body；Be arranged on described button body can be with The holding section of described tripping operation cross bar engaging；Position and the described button portion positioned at described button body and described holding section between And be arranged to axis with described button portion press the upwardly extending axle portion in the orthogonal side in direction, be configured to described by pressing Button portion makes described button body rotate around described axle portion and make described holding section apply the knot of thrust to described tripping operation cross bar Structure,

Described open-close mechanism section has the dead eye of the axle portion supporting described trip button,

The axle portion of described trip button is to bend to the torsion spring with a pair of wire rod being parallel to each other of generally U-shaped shape, this torsion spring The wire rod of a side be locked in the part of described open-close mechanism section, the wire rod of the opposing party is inserted in described open-close mechanism section In described dead eye.

4. a kind of assemble method of circuit-breaker, in described circuit-breaker, is equipped with the inside of framework：It is provided with solid The fixed contact of fixed contact；It is provided with the movable contact of the moving contact contacting with described fixed contact；With this movable contact even The open-close mechanism section connecing；Described open-close mechanism section is made to carry out the tripping operation cross bar of trip operation with by depressed action, in institute The outer surface stating framework arranges trip button, carries out by pressing by the action of pressing of this trip button to described tripping operation cross bar Make, the assemble method of described circuit-breaker is used for for described trip button being assembled into described open-close mechanism section, this assemble method It is characterised by：

Described trip button includes：It is arranged on the button portion at the top of button body；Be arranged on described button body can be with The holding section of described tripping operation cross bar engaging；Position and the described button portion positioned at described button body and described holding section between And be arranged to axis with described button portion press the upwardly extending shaft insertion hole in the orthogonal side in direction,

Described open-close mechanism section includes a pair of side plates and is located at the top board on the top of this pair of side plates, has in the side plate of a side The dead eye of plate thickness direction insertion,

Described trip button is configured with the corresponding mode of described dead eye of described side plate with described shaft insertion hole, afterwards,

The torsion spring with a pair of wire rod being parallel to each other of generally U-shaped shape will be bent to, described top will be locked on the wire rod of a side The described axle of described dead eye and described trip button that the wire rod of a part for plate and the opposing party is inserted in described side plate is inserted The mode entering hole is installed.