JPH09161642A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the overlapping amount of a contact in a simple method or visually in an assembly process without a measuring instrument and without conducting complicated work. SOLUTION: A circuit breaker has a fixing side conductor 19 having a contact 20, and a cross bar 13 which pivots a moving arm 15 having a contact 18 on moving side facing the fixed side conductor 19, the cross bar 13 is rotated by operation of a handle 4, and the moving side contact 18 is separated from the fixing side contact 20. Level differences 13c, 13d, 13e indicating the relative position relation between the moving arm 15 and the cross bar 13 are arranged in the side wall part of the cross bar positioned on both sides of the moving arm 15.

Description

Detailed Description of the Invention

[0001]

[0001] The present invention relates to a circuit breaker.

[0002]

2. Description of the Related Art A conventional circuit breaker is shown in FIG. In FIG. 6, the main body case 1 is composed of a case main portion 2 and a cover 3. An operation handle 4 is provided at the center of the main body case 1 so as to be rotatable in the left-right direction, and the rotation operation of the operation handle 4 is transmitted to the opening / closing mechanism 5. The opening / closing mechanism 5 is a catch 8 rotatably supported by a frame 6 by a shaft 7, and although not shown, the catch 8 is supported by a catch receiver at its right end and is stationary. The two links 9 and 10 constituting the toggle mechanism are connected by a shaft 11 and the other ends thereof are respectively connected to the shaft 12 at an intermediate portion of the catch 8.
And the left end of the crossbar 13 are connected by a shaft 14,
The crossbar 13 is rotatably supported by the case 2 by a shaft portion 13a, and the movable arm 15 is held by a shaft 17 so that a rotational force is applied counterclockwise by a torsion spring 16. The movable arm 15 has a contact 18 at the left end thereof, and is in contact with a contact 20 provided on a fixed conductor 19 facing the contact 18 and is stationary. On the other hand, the tension spring 21 is mounted between the connecting shafts 11 of the links 9 and 10 and the operation handle 4 in a biased state, so that the toggle ring mechanism is about to pull downward. When the operation handle 4 is operated to the right here, one end of the tension spring 21 also moves to the right, and when the dead point in the rotational direction of the link 9 is crossed, the link 10 is rapidly pulled up, and the cross 10 is accompanied therewith. The bar 13 rotates in the clockwise direction, the abdomen 15a of the movable arm 15 approaches the stopper 13b of the crossbar 13, and when they come into contact with each other, the contact 18 starts to open and reaches the open circuit state. When the operation handle 4 is operated to the left again, the tension spring 21 goes beyond the dead point of the rotation of the link 9 and pushes down the link 10 to rotate the crossbar 13 counterclockwise and return to the closed state.

In the closed state as shown in FIG. 6, the movable arm 15 axially supported by the crossbar 13 by being given a counterclockwise rotational force is further contacted with the fixed conductor 19. It remains stationary while being able to rotate counterclockwise. Therefore, the movable arm 15 can rotate until the abdomen 15a of the movable arm 15 comes into contact with the stopper portion 13b of the crossbar 13. Therefore, when the fixed conductor 19 is not provided, the movable arm 15 can be rotated.
Stops at the imaginary line (dashed-dotted line). Amount x of overlap between the fixed side contact 20 and the movable side contact 18 at the imaginary line position
Is required to maintain an appropriate value in terms of stability, reliability and life of the contact state when the circuit breaker is turned on, and it is measured and controlled during assembly and inspection.

[0004]

However, it is not possible to directly measure in the assembled state, and therefore the L ₁ dimension in the normal state and the L ₂ dimension in the state in which the fixed conductor is removed are measured and calculated. However, it is very troublesome and there is a problem in that the fixed conductor is taken in and out after the assembly, so that the shape and size are restricted. It is also possible to measure and calculate the relative position or angle of the crossbar and the movable arm, but it is difficult to identify the same position geometrically, so small models can be inserted in the correct state with general-purpose measuring tools such as calipers. It was difficult to measure because it was not there.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and a circuit breaker capable of measuring the overlapping amount of contacts in assembly by a simple method or visual inspection without using a measuring tool without requiring complicated work. To provide a container.

[0006]

In order to achieve the above object, firstly, a fixed side conductor having a contact point and a cross bar for pivotally supporting a movable arm having a movable side contact facing the fixed side conductor are provided. In the open circuit breaker that rotates the crossbar by operating the handle to separate the movable side contact from the fixed side contact, the side walls of the crossbar located on both sides of the movable arm are provided with the movable arm and the crossbar. It is characterized in that a step showing a relative positional relationship is provided.

Secondly, the step provided on the side wall portion of the crossbar is characterized by being matched with the inclination of the back surface of the movable arm. Thirdly, a scale is provided on the end surface of the crossbar corresponding to the movable range portion of the movable arm.

Fourthly, grooves are provided in the side wall portions located on both sides of the movable arm of the crossbar so that the movable range of the back surface of the movable arm is located closer to the middle of the opening than the bottom of the groove. It is characterized by being configured.

As described above, the circuit breaker of the present invention is characterized in that the crossbar is provided with steps, scales or the like so that the relative position of the crossbar and the movable arm, that is, the overlapping dimension of the contacts can be determined. Judgment of position by step,
The movable amount of the movable arm, that is, the overlapping dimension with the fixed contact can be measured and controlled by the scale or the like.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
This will be described with reference to FIGS. A first embodiment based on the invention of claim 1 will be described with reference to FIG. In the embodiment of the present invention, the same or corresponding parts as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, the crossbar 13 is held at the position shown in the drawing through a link 10 by an opening / closing mechanism (not shown). The movable arm 15 is supported by the crossbar 13 by a shaft 17 and is rotated counterclockwise by a torsion spring 16, and a contact 18 at the left end is a contact 2 of a fixed conductor 19.
It is stationary (closed state) at the position where it abuts 0.

If the fixed conductor 19 is not provided, the abdomen 15a of the movable arm 15 is the stopper portion 1 of the crossbar 13.
It can be rotated until it comes into contact with 3b, and is in the state of a chain double-dashed line, and therefore, it overlaps with the fixed-side contact 20.
Also, the alternate long and short dash line shows the state in the case of the minimum required overlapping dimension.

Stepped steps 13c, 13d, 13e are formed on the side wall of the crossbar 13 that sandwiches the movable arm 15.
Extension lines of the surfaces 13c to 13e at the reference point in the movable arm 15 in the normal contact state (solid line), the necessary limit state (one-dot chain line), and the zero state (two-dot chain line). So that it reaches. Step 1 provided on the crossbar 13
3c to 13e may be provided on one side, and the reference portion of the movable arm may be provided at a more convenient place such as putting a mark. For more detailed control, the number of marks should be two or more, and the number of steps should be reduced. You can increase it.

In the first embodiment, a ruler or the like is applied to the flat surface portion in the assembling state at the time of assembling to determine which step is coincident with the reference point of the movable arm and how to set the reference point of the movable arm. You can visually check the overlapping amount (dimension) of the contacts.

Next, a second embodiment based on the second aspect of the invention will be described with reference to FIG. In the second embodiment, the steps 13c to 13e on the side wall of the crossbar 13 are shaped so that the inclination and position of the back surface 15c at each position of the movable arm 15 are the same.

In the second embodiment, the overlapping amount (dimension) of the contact can be visually confirmed by determining which stepped portion and the back surface of the movable arm are coincident (flush). In the case of disagreement, they are not parallel to each other, so that it is possible to easily determine (the discrimination function of whether or not the human eyes are parallel is high).

Next, a third embodiment based on the third aspect of the invention will be described with reference to FIGS. 3 and 4. FIG. 4 is AA of FIG.
It is a figure showing a section. In the third embodiment, the surface of the other end of the crossbar 13 is arcuate about the support shaft 17 of the movable arm 15, and the scale 13g is provided on the movable range portion of the movable arm of the surface 13f. In addition, scale 13g
May be at equal intervals or control limit positions, or both, and the surface on which the scale 13g is provided does not necessarily have to be an arc shape with the support shaft 17 of the movable arm 15 as the center.

In the third embodiment, the overlapping amount (dimension) of the contact point can be visually determined by the scale position of the reference portion such as the outer circumference of the movable arm. It is also easy to deal with changes in control limits.

Next, a fourth embodiment based on the invention of claim 4 will be described with reference to FIG. In the fourth embodiment, V-shaped grooves 13h are provided on both side wall portions of the crossbar 13 so that the movable range of the rear surface 15c of the movable arm 15 is near the bottom of the V-shape and inside the opening. Further, a scale may be provided on the V-shaped groove portion 13h.

In the fourth embodiment, a pin having an appropriate diameter is attached to the V groove portion 1.
It is possible to know the overlapping amount (dimension) of the contact by inserting it in 3h and contacting the back surface of the movable arm. When the scale is used together, it can be visually inspected.

[0021]

As is apparent from the above description, it is possible to know the overlapping amount of the contacts visually or by a simple method in the assembled state. Therefore, it is easy to check the assembly, pass / fail judgment at the time of inspection, trend management, and life limit due to contact wear at the time of regular inspection.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a third embodiment of the present invention.

4 is a sectional view taken along line AA of FIG.

FIG. 5 is a diagram showing a fourth embodiment of the present invention.

FIG. 6 is a view showing a part of a molded case of a conventional circuit breaker.

[Explanation of symbols]

10 is a link, 13 is a crossbar, 15 is a movable arm,
Reference numeral 16 is a torsion spring, 17 is a shaft, 18 is a contact, 19 is a fixed conductor, and 20 is a contact.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Kuwamura 2121 Sayo, Asahi-cho, Mie-gun, Mie Prefecture Mie Factory, Toshiba Corporation (72) Eiji Kanamori 2121 Sayo, Asahi-cho, Mie-gun, Mie Incorporated company Toshiba Mie factory (72) Inventor Takashi Araki 2121 Nobuo, Asahi-cho, Mie-gun, Mie Prefecture Incorporated company Toshiba Mie factory

Claims (4)

[Claims] 1. A fixed-side conductor having a contact, and a crossbar pivotally supporting a movable arm having a movable-side contact facing the fixed-side conductor. The movable-side contact is rotated by operating a handle. In the open circuit breaker that separates from the fixed-side contact, the side wall portions of the crossbars located on both sides of the movable arm are provided with a step indicating the relative positional relationship between the movable arm and the crossbar. And circuit breaker. 2. The circuit breaker according to claim 1, wherein the step provided on the side wall of the crossbar is adjusted to the inclination of the back surface of the movable arm. 3. The circuit breaker according to claim 1, wherein a scale is provided on an end surface of the crossbar corresponding to a movable range portion of the movable arm. 4. A groove is provided in the side wall portions located on both sides of the movable arm of the crossbar, and the movable range of the back surface of the movable arm is positioned closer to the middle of the opening than the bottom of the groove. The circuit breaker according to claim 1, wherein: