JPS6343700Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in contactors for switchgears.

Although there are a wide variety of contactors for switches, an example of a very common conventional structure is shown in FIG. A pin 3 passes through the contact fingers 1, 1 and the current collector plate 2, which are opposed to each other. A contact spring 4 is fitted to the pin 3, and spherical protrusions 1a, 1a are provided at the base ends of the contact fingers 1, 1 facing each other.
are sandwiching the current collector plate 2 so as to face each other, and a curved portion 1 is provided at the tip of the contact fingers 1, 1.
b and 1b, with a movable contact 5 sandwiched between them so as to face each other. Therefore, due to the restoring force of the contact spring 4, an appropriate contact pressure is applied to the movable contact and the current collector plate. Note that 6 is an auxiliary pin, which connects the contact fingers 1, 1 and the current collector plate 2.
The contact fingers 1, 1 are prevented from lateral deflection. Further, if the current collecting plate 2 and the movable contact 5 come into direct contact, there is a risk of damaging the contact portion of the movable contact 6, so a suitable gap is created by a stopper (not shown).

The conventional structure shown in Fig. 1 is generally used in practical use, and there does not seem to be any drawbacks, but if you examine it in detail, you will find that it has some problems. be. That is, since the contact spring 4 is located between the spherical protrusion 1a, which is the fulcrum, and the contact surface 1b of the movable contact, the contact spring 4 must be stronger than the contact pressure according to the principle of force balance. If a and b in Fig. 1 are equal, the contact spring load will be twice the contact pressure. Therefore, if a spherical projection is placed between the contact spring and the movable contact, the contact spring can be made weaker, and the contact portion of the switch can be made more compact.

Based on the results of such studies, the present invention provides a compact switch contact using a weak contact spring.

FIG. 2 is an explanatory diagram showing an embodiment of the present invention. For convenience of explanation, parts that are the same as those in FIG. 1 are numbered the same or with an increment of 10.

There are contact fingers 11, 11 facing each other and a substantially U-shaped current collector plate 12 that surrounds the contact fingers 11, 11. is penetrated. At the center portions of the contact fingers 11, 11, outwardly protruding spherical protrusions 12a, 12a contact the inside of the current collector plate 12 at opposing positions to serve as fulcrums.

On the other hand, a contact spring 14 is fitted inside the contact fingers 11, 11 by the pin 13, and the restoring force of the contact spring 14 causes the curved portions 11 at the tips of the contact fingers 11, 11 to
The movable contact 5 is scissored so that b and 11b face each other to apply appropriate contact pressure. In this case, since the spherical protrusion serving as the fulcrum is located between the contact spring 14 and the curved portions 11b, 11b of the contact fingers, the contact spring 14 may naturally have a smaller force than that shown in FIG. If a and b in FIG. 2 are equal, it is reasonable that the contact spring load should be the same as the contact pressure. In addition, the contact spring 14 and the contact 5
In order to prevent contact, an appropriate gap is created by a stopper (not shown), but since the gap width should be the same as in Figure 1, it is natural that the contact part of the switch should be compact. It is possible to make it.

Note that 16 is an auxiliary pin that passes through the contact fingers 11, 11 facing the current collector plate 12,
The current collector plate 12 has upper and lower contact surfaces and is integrally formed in a substantially U-shape. Further, the shape may be a rectangular tube shape or the like.

As explained above, the present invention provides a compact contactor for a switch having a weak contact spring, and has the effect that the switch itself can be made compact by using a compact contactor. be.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a contact part of a conventional switch, and FIG. 2 is an explanatory diagram showing an example of a contact part of a switch according to the present invention. In the figure, 11 is a contact finger, 11a is a spherical projection, 12 is a current collector plate, 13 is a pin, 14
is a contact spring.

Claims (1)

[Scope of utility model registration request] contact fingers facing each other; a current collector plate formed to sandwich the contact fingers from the outside;
It consists of a pin that passes through the current collector plate and the proximal end of the contact finger, and a spherical protrusion that protrudes outward at the center of the contact finger contacts the inner surface of the current collector plate and serves as a fulcrum. A contact for a switch, characterized in that a contact spring is fitted inside the pin.