JPS6125146Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a switch.

Conventionally, there has been a two-point switch having an electrode structure as shown in FIG. This structure electrically connects a pair of movable electrodes 1, which can simultaneously move in opposite directions to perform closing or opening operations, by a conductive member 2 that is immovably provided, and each movable electrode A fixed electrode 3 is provided corresponding to 1. 4 is an arc extinguishing rod attached to the tip of each movable electrode 1 via an arc-resistant metal 4a;
5 is an arc extinguishing chamber that covers each fixed electrode 3; 6 is an arc extinguishing chamber that covers each fixed electrode 3;
This is the terminal connected to.

In this electrode structure, the approximate center of each movable electrode 1 is in contact with the conductive member 2 in the open circuit state of each phase, so that the distance between the rear end of each movable electrode 1 and the fixed electrode 3 of the example not corresponding thereto is The insulation distance A was made to be sufficiently long. Therefore, both fixed electrodes 3
There was a problem in that the dimension B between them became longer, and as a result, the case size of the switch also became larger.

Therefore, the purpose of the present invention is to provide a switch that can shorten the distance between the rear end of the movable electrode and the fixed electrode, etc. in the vicinity when the circuit is opened, and can also reliably maintain insulation between the two. .

An embodiment embodying the present invention will be described below based on FIG. 2, with only the parts different from the conventional example. In this embodiment, the tip of each movable electrode 1 comes into contact with the conductive member 2 in the open state. In this state, the distance between the corresponding movable electrodes 1 and fixed electrodes 3 is the same as in the conventional case. Therefore, in this embodiment, in the open circuit state, the rear end of each movable electrode 1 and the fixed electrode 3 on the side not corresponding thereto are in a very close positional relationship, and the insulation distance A between them is extremely short. ing.

Reference numeral 7 denotes a cylindrical insulating cover with a bottom provided to cover the entire rear part of each movable electrode 1 from the conductive member 2 in the open state, and is fixed in the switch case and covers the rear end of each movable electrode 1. The department is closed. Each insulating cover 7 is made of insulating resin, porcelain, crystallized glass, or the like.

That is, the insulating cover 7 is interposed between the movable electrode 1 and the fixed electrode 3 on the side that does not correspond to the movable electrode 1 and the movable electrode 1.

Therefore, in the switch of the present invention, even though the fixed electrode 3 is disposed close to the rear end of each movable electrode 1 when the circuit is opened, sufficient dielectric strength can be maintained between the movable electrodes 1. In addition, each fixed electrode 3
By arranging the movable electrode 1 close to the rear end of the movable electrode 1, the dimension B between both the fixed electrodes 3 can be shortened, and the dimension of the entire switch can also be reduced.

Note that when the switch is opened, both movable electrodes 1 protrude toward the fixed electrode 3, and the insulating cover 7 does not move.

A specific example of the interlocking mechanism for interlocking the pair of movable electrodes 1 in the above embodiment will be briefly described based on FIG. This is an intermediate gear that meshes with the rack 11. Reference numeral 13 is a large-diameter drive gear provided between both intermediate gears 12 so as to be able to rotate forward and backward, and also has a function as the conductive member 2 .

Therefore, in this interlocking mechanism, both movable electrodes 1
are simultaneously moved in opposite directions via a pair of intermediate gears 12 by the forward and reverse rotation of the driving gear 13.

As detailed above, the present invention covers the rear part of each movable electrode with an insulating cover formed from an insulating material in the shape of a cylinder with a bottom. By interposing the movable electrode between fixed electrodes and fixing it inside the switch case, insulation between the movable electrode and the conductive member can be reliably maintained, and the size of the switch case can be reduced. This is a practically preferable device for use as a switch.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway schematic front view showing the electrode structure of a conventional two-point cutter, and Fig. 2 is a partially cutaway schematic front view showing an embodiment of the present invention in a two-point cutter. FIG. 3 is a partial perspective view showing an interlocking mechanism of both movable electrodes. A movable electrode 1, a fixed electrode 3, and an insulating cover 7.

Claims (1)

[Claims for Utility Model Registration] A pair of fixed electrodes are arranged spaced apart from each other in the switch case, and a pair of movable electrodes electrically connected to each other are provided between the fixed electrodes, and the movable electrodes are arranged oppositely to each other. In a two-point switch that opens and closes by reciprocating in the direction of A switch characterized by having a bottomed cylindrical insulating cover arranged therein.