JPS5850591Y2 - Operation mechanism of circuit breakers and disconnectors - Google Patents

Description

[Detailed description of the invention] This invention relates to circuit breakers such as wiring breakers and earth leakage breakers, especially small, mass-produced circuit breakers, and aims to facilitate the assembly of their operating mechanisms. Concerning improvements in the component configuration of.

Generally, circuit breakers have a large number of parts and often require manual labor to assemble.

Therefore, each component is required to have a configuration that is as easy to assemble as possible.

Fig. 1 is a side view showing the closed circuit state of the operation mechanism of a general circuit breaker. It is stored.

The operating handle 2 is rotatably mounted around a pivot 3a inserted through the side plate 1 into a hole 2at bored in the body 2a, and the handle portion is attached to the opening 4 of the case cover 4.
It protrudes upward from a.

The upper end of the upper link 5, which is a component of the toggle link mechanism, is connected to the body 2a of the operating handle 2 by a connecting shaft 3b so as to sandwich the body 2a.

Further, a screw spring 6 is wound around the pivot shaft 3a, and the screw spring 6 has one end fixed to the side plate 1 and the other end locked to the connecting shaft 3b of the upper link 5, and rotates the operating handle 2 clockwise in the figure. We are encouraging them to do so.

A lower link 7 and one end of a connecting rod 8 are connected to the lower end of the upper link 5 by a shaft 9, and the lower end of the lower link 7 is connected to a movable contact holder 11 by a shaft 10.

This movable contact holder 11 is connected to a movable contact holder disposed on the base pole via a rotation shaft 12 extending through the side plate 1, and is connected to a movable contact holder 11 on the central pole.
It is urged to rotate clockwise by an opening spring 13 attached between the side plate 1 and the side plate 1.

11a is a movable contact, 11b is a movable contact, 20 is a fixed contact, and 20a is a fixed contact, which constitute an opening/closing mechanism together with the movable contact holder 11, rotation shaft 12, and opening spring 13. There is.

The other end of the connecting rod 8 is connected via a latch 14 to an overcurrent response device (not shown).

To open the opening/closing mechanism by manual operation, the operating handle 2 is tilted to the right in the figure about the pivot 3a.

Then, the connecting shaft 3b of the upper link 5 becomes the pivot shaft 3a, the connecting shaft 3
At the moment when the operating handle 2 moves clockwise due to the biasing force of the screw spring 6, the pressing force of the link 7 is released and the biasing force of the opening spring 13 is released. As a result, the movable contact holder 11 rapidly rotates clockwise.

Along with this, the movable contact 11a separates from the fixed contact 20.

In addition, when the overcurrent response device operates, the connecting rod 8 moves to the shaft 9.
By pressing leftward, the connecting shaft 3b of the operating handle 2 is rotated clockwise, and the circuit is opened in the same manner as by manual operation.

When closing the opening/closing mechanism, when the operation handle 2 is tilted to the left, the links 5 and 7 press the movable contact holder 11 while resisting the biasing force of the opening spring 13.
Contact 11b of a closes.

In this state, the pivot 3a enters the dead center, and the opening spring 1
The biasing force 3 acts as a force that biases the operating handle 2 in a counterclockwise direction, and the closed circuit state is maintained.

In addition, in the above-mentioned operation mechanism, the pivot 3a of the operation handle 2
and the connecting shaft 3b are both attached to holes drilled parallel to the body of the operating handle 2, so both shafts inserted into these two holes can be integrated into a U-shape. In the operating mechanism as described above, which is preferable from the viewpoint of reducing the number of parts, the relationship between the operating handle and the upper link is as shown in FIG.

That is, FIG. 2A is a front view of the main part of the operating mechanism, and FIG. 2B is a side view thereof. U-shaped pin 3
A single flat shaft 3a1 is inserted, and the body 2
A pair of shaft holes 5ai of the approximately H-shaped upper link 5 are aligned with the shaft holes 2a2 in the stepped portion 2b near the periphery of a, and the shaft 3b, which is the other horizontal portion of the U-shaped pin 3, is fitted here. is inserted, and the upper link 5 is free to rotate within a predetermined range about the connecting shaft 3b.

Further, the shaft holes of the lower link 7 and the connecting rod 8 (see FIG. 1) are aligned with the shaft hole 5az on the other end side of the link 5, and a shaft 9 is inserted therein.

In this configuration, the assembly work is performed by first inserting the operating handle 2 between the side plates 1 and opening the respective shaft holes 1a and 2a1.
Insert the shaft 3a halfway, and then align the shaft hole 5a1 on one side of the upper link 5 with the shaft hole 2az, but at this time, if you release your hand or tweezers, the upper link 5 will fall off from the operating handle. Therefore, great care had to be taken in maintaining the links.

In view of the above-mentioned conventional drawbacks, this invention aims to provide an operating mechanism for a circuit breaker that is easy to assemble.

According to this invention, the above object is provided with an operating handle that protrudes outside the case and a link mechanism that opens and closes a movable contact with respect to a fixed contact by operating the operating handle or by operating an overcurrent response device. In an operation mechanism for a circuit breaker in which a body and a link in a link mechanism connected thereto are connected via a connecting shaft, the link is connected to a stepped portion where the link is held with play in the body of the operation handle. This is achieved by providing a slope to ensure a tight fit.

Embodiments of this invention will be described below with reference to the drawings.

FIG. 3A is a front view of the essential parts of the circuit breaker operating mechanism according to the present invention, and FIGS. 3B and 3C are side views of the same in different states.

In the figure, the difference from the conventional example is that the operating handle 2
This is because a slope 2C is provided in a part outside the movable range C of the upper link 5, which is connected to the step part 2b, and which increases in thickness from the periphery toward the center.

Note that the maximum thickness dimension A of the slope 2C is larger than the inner dimension B of the two parallel surfaces of the upper link 5.

As a result, when assembling, first attach the upper link 5 to one end of the step 2b of the operating handle 2 and align the shaft holes 2a2 and 5at, then rotate the upper link 5 to the position shown in Figure 0 and move the slope 2C. The upper link 5 is press-fitted into the handle 2, and the upper link 5 is held by the operating handle 2.Then, the whole is inserted between a pair of parallel side plates 1 shown in FIG. One shaft 3a of the letter-shaped pin 3 is inserted here, and the other shaft 3a2 is inserted into the previously matched shaft holes 2a2 and 5a1, and then the upper link 5 is returned to the normal movable range C.

In the above example, the slope is provided on both sides of the body, but it may be provided on only one side.

As described above, the present invention provides a slope in the vicinity of the shaft hole of the operating handle to which one end of the upper link is attached, so that the upper link is tightly fitted, and the upper link is held here during assembly. This prevents it from falling off even if the hand or tweezers are removed, making assembly easier and contributing to the automation of assembly.

[Brief explanation of drawings]

Figure 1 is a partially cutaway side view of the main parts of a typical circuit breaker.
Figure 2A is a front view of the main parts of a conventional circuit breaker operating mechanism;
FIG. 2B is a side view of FIG. 2A, FIG. 3A is a front view of the main parts of the circuit breaker operating mechanism according to the present invention, and FIGS. 3B and C are views of FIG. 3A in different states. FIG. 1: Side plate, 1a: Shaft hole of side plate, 2: Operation handle, 2a1゜2a2: Shaft hole of operation handle, 2C: Incline, 3a: Pivot, 3
b: connection shaft, 5: upper link, 5a1: shaft hole at one end of upper link, A: thickness of slope, B: inner distance of upper link,
C: Upper link movable range.

Claims (1)

[Scope of utility model registration request] An operating handle that protrudes outside the case, and a link mechanism that opens and closes a movable contact relative to a fixed contact by operating the operating handle or by operating an overcurrent response device, and includes a body of the operating handle and a link mechanism connected to the operating handle. In the operation mechanism of a circuit breaker in which the link is connected to the inner link via a connecting shaft, the link is connected to the step part where the link is sandwiched with play in the body of the operation handle, and the slope is for tightly fitting the link. An operating mechanism for a circuit breaker, characterized in that it is provided with.