JPS60208018A - Breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a breaker that allows contacts to maintain a constant contact pressure and is made smaller and lighter.

[Background of the invention]

FIG. 1 is a plan view of a conventional air breaker, and FIG. 2 is a side sectional view of the conventional air breaker. The front plate 1 has side plates 2,
3 and the operating mechanism section 7 are attached. The side plates 2 and 3 have a structure in which a breaker base 4, mounting fittings 5 and 6 are attached, and a bearing 17 is also attached, and the main shaft 8 is supported by the bearing 17 so that the main shaft can rotate freely. A link 18 connected to the main shaft 8 from the operating mechanism 7 and
It is connected to a rod 10 via a pin 9, and the rod 10 is connected to a movable main contact via a hinge 11. The upper terminal 13 also serves as a fixed main contact and is attached to the breaker base together with the lower terminal 14. In FIG. 2, the closing spring 16 is in a stored state and the air breaker is in a closed state.

In normal circuit closing operation, the link 18 is pushed upward by the closing spring 16 and the main shaft 8 is rotated counterclockwise, so that the rod 10 moves to the right and moves the movable contact 12 against the contact spring 15. and upper terminal 1 which also serves as a fixed contact.
3 maintains a constant contact pressure, resulting in a closed circuit state.

However, in an air breaker that requires large current energization and large current interruption, the force of the contact pressure spring 15 is also large, and
The number of movable contacts 12 also increases.

If the number of movable contacts 12 increases, the L dimension in FIG. 1 will inevitably increase. Furthermore, as the contact spring force increases, the energy required to close the circuit also increases, so the spring force of the closing spring 16 must also be increased.

In this way, the force F1 applied to the front plate 1 is determined by the closing spring force, and the force F2 applied to the main shaft 8 is determined by the contact force spring 15.
determined by the spring force. The deflections of the front plate 1 and the main shaft 8 are proportional to the forces F, , F, and L3, respectively. Therefore,
In the conventional system, the front plate 1 is at the 1' position and the main shaft 8 is at the 8' position.
', the spring force of the regular closing spring 16 is not exerted,
The contact spring 15 also does not produce the normal spring force. In order to reduce each deflection, it is possible to solve the problem by increasing the thickness of the front plate 1 and increasing the diameter of the main shaft 8, but this configuration has disadvantages in terms of size and weight reduction, and costs. Becomes high.

[Purpose of the invention]

An object of the present invention is to provide a breaker that is small in size, lightweight, and capable of maintaining stable contact pressure.

[Summary of the Invention] The main point of the present invention is to provide a structure in which the deflection of the front plate and the deflection of the main shaft can be reduced by inserting a screw between the front plate and the main shaft.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a plan view of the air breaker of the present invention, and FIG. 4 is a side sectional view of the air breaker of the invention.

In FIGS. 3 and 4, by inserting a constant piece 19 between the front plate l and the main shaft 8, it is possible to reduce the deflection of the front plate l and the deflection of the main shaft 8.

F acts on the front plate due to the spring force of the closing spring 16. A force F2 is applied to the main shaft 8 by the contact spring 15, but a constant piece 1 is applied between the front plate 1 and the main shaft 8.
9, the front plate 1 and the main shaft 8 will receive a force F, and if the deflection is large, the force F2 will be applied.
Therefore, almost no deflection occurs.

Similarly, if the main shaft 8 and the front plate 1 receive a force F2 and the deflection is large, the force F1 will be applied to the main shaft 8 and the front plate 1, and almost no deflection will occur.6 [Effects of the Invention] Since the deflection of the face plate and the main shaft can be kept small, the plate thickness of the front plate can be made thin, and the diameter of the main shaft can be made small, the product is small and lightweight, and the workability is easy, resulting in cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional air breaker, FIG. 2 is a side sectional view of a conventional air breaker, FIG. 3 is a plan view of an air breaker according to the present invention, and FIG. 4 is a plan view of a conventional air breaker. FIG. 3 is a side sectional view of the air breaker. 4... Breaking part base, 7... Operating mechanism part, 8...
・Main shaft. 19... Quistant Peace. Agent Patent Attorney Akio Takahashi

Claims (1)

[Scope of Claims] 1. In a circuit breaker in which an operating device is arranged on the front side and a breaking section is arranged on the rear side, a plate on which the operating device is attached on the front side, the operating device, and the breaking section are arranged on the front side. A circuit breaker characterized in that a constant piece is inserted between the connected and driven main shaft.