JPS58126617A - Contact block - 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 The present invention relates to a contact block that can be incorporated into electrical equipment such as relays and switches.

Conventionally, in this type of contact block, the initial contact pressure P shown in FIG. In order to obtain this, as shown in Figs. 1 and 2, an insulating stand 3 is fixed to the base of the contact piece 2 provided with the contact point 1, and another insulating stand 4 is fitted and fixed to this insulating stand 8. In addition, there has been provided a device in which the protrusion 5 of the insulating stand 4 presses the vicinity of the contact point of the contact piece 2 to bend the contact piece 2.

However, this method not only requires an assembly process in which the insulating stands 8 and 4 are separately molded and joined together, but also requires an adjustment process due to variations in the contact positions due to assembly accuracy issues, making it expensive as a whole. It was on me.

The present invention has been made in view of the above-mentioned drawbacks, and its purpose is to integrally mold an insulating base for fixing the base of a contact piece and a member for applying initial contact pressure, thereby omitting an extra assembly process. Another object of the present invention is to provide a contact block that can be manufactured at low cost by improving assembly accuracy and omitting the step of adjusting the contact positions.

The present invention will be described below with reference to the accompanying drawings.

FIG. 4 shows a first embodiment of the contact block according to the present invention, and 8.9 is a mold.

The contact section is composed of a movable contact piece 11 with a movable contact 10 and a fixed contact piece 13.15 with a fixed contact 12.14, each contact piece 11.18.15 being a conductive thin piece with spring properties. Consisting of The fixed contact piece 18 is inserted into the molds 8 and 9, and has a base 18a fixed to the insulating stand 16 by insert molding.

The mold 8 is formed with an opposing portion 8a having a curve corresponding to the natural deflection of the fixed contact piece 13, and this opposing portion 8a comes into contact with one side of the fixed contact piece 13 during mold clamping.
This fixed contact piece 13 is bent along the facing portion 8a,
Insert molding is performed in this state. When the mold is opened after the resin has hardened, one side 17 of the insulating base 16 is molded into the same shape as the opposing part 8a of the mold 8, and as a result, the fixed contact piece 18 is in its natural deflection state as shown in FIG. Press to the left to apply initial contact pressure P to the fixed contact 12. (See Figure 8). In this case, the fixed contact piece 1B is easily released from the one side 17 of the insulating base 16. Also, the initial contact pressure P. The corner 17a of the insulating stand 16 has the greatest influence on the accuracy of the contact position.
However, since the corner portion 17a is molded integrally with the insulating base 16, the positional accuracy is extremely high, and there is no need to adjust the contact position after molding.

Note that the other fixed contact piece 15 is also fixed to a part continuous with this insulating base 16 using the same molding method as above, and the movable contact piece 11 is fixed only at its base! It is fixed to a part continuous with the insulating stand 16 by insert molding.

Further, each contact piece 11, 18, 15 is formed by punching the hoop material into a predetermined shape leaving a continuous portion, and is molded with resin while being conveyed integrally.

5 and 6 show a second embodiment, in which a curved surface with a curvature slightly larger than the natural deflection of the fixed contact piece 13 pressed near the contact point at a corner 17a of the insulating base 16 is formed. It is formed on the side surface 17.

In this case, the fixed contact piece 13 is attached to the facing portion 8a of the mold 8 in advance.
A curved surface with a curvature slightly larger than the above-mentioned natural deflection is formed in advance, and a mold 8.9 is clamped to form the insulating base 16 as shown in FIG. At this time, the fixed contact piece 13 is pressed by the opposing portion 8a of the mold 8 and deflects along this opposing portion 8a, and one side 17 of the insulating base 16 is formed into this curvature.

After molding, the fixed contact piece 13 is released from one side 17 of the insulating base 16 by its own spring force by the natural deflection pressed at the corner 17a), accurate initial contact pressure Po,
Contact position can be obtained.

FIGS. 7 and 8 show an eighth embodiment, in which the fixed contact piece 13 is given a certain amount of deflection in advance, as shown in FIG.
The insulating base 16 is insert-molded using the molds 8 and 9. The opposing portion 8a of the mold 8 is straight, and during molding, the fixed contact piece 13 is pressed against this opposing portion 8a and held straight, and one side 17 of the insulating stand 16 is molded straight. Therefore, after molding, the fixed contact piece 13 attempts to return by the predetermined deflection due to its own spring force, and is released from the one side 17 of the insulating base 16, so that the part near the contact point becomes
7a, accurate initial contact pressure P. ,
Contact position can be obtained.

Note that the predetermined initial contact pressure P. In order to obtain this, it is important to accurately set the amount of deflection of the fixed contact piece 18 processed before molding. The load (contact pressure) when pushed in until it becomes straight, in other words, the contact area of the fixed contact piece 13 after forming the insulating base 16 is at the corner 1
The pressure that comes into contact with 7a is P. It is set so that

FIG. 9 shows an electromagnetic relay equipped with a contact block according to the present invention, and when a current is supplied to the coil 2o, the movable iron piece 21
is attracted to the iron core 22, and the card 28 moves in the direction of arrow a.
The movable contact piece 1 moved in the direction and engaged with this card 28.
1 is bent in the same direction, and the movable contact 10 contacts the fixed contact 12. On the other hand, when the power supply to the coil 20 is stopped,
The returning force of the movable contact piece 11 causes the card 23 to return in the opposite direction of arrow a, and the movable contact 1o switches to the fixed contact 14.

As is clear from the above description, according to the present invention, the vicinity of the contact of the contact piece whose base is fixed to the insulating base by insert molding is pressed by the corner integrally molded on the insulating base, and the contact is Because the initial contact pressure is applied, the number of parts can be reduced and the assembly process can be simplified without requiring separate members as shown in Figures 1 and 2 above. The corners that apply pressure have high dimensional accuracy because they are integrally molded with the insulating stand, and there is no need to adjust contact pressure or contact position after assembly, making the overall manufacturing process inexpensive.

[Brief explanation of drawings]

Figures 1 and 2 are front views of conventional contact blocks, Figure 3 is a graph showing the relationship between contact stroke and contact pressure, and Figure 4 is a graph showing the relationship between contact stroke and contact pressure.
The figure is a sectional view showing the first embodiment of the contact block according to the present invention, FIGS. 5 and 6 are sectional views showing the second embodiment, and FIGS. 7 and 8 are sectional views showing the third embodiment. 9 are perspective views of an electromagnetic relay incorporating a contact block according to the present invention. 12... Fixed contact, 13... Fixed contact piece, 1
3a...certain part, 16...insulation stand, 17a...
Corner. Patent applicant: Tateishi Electric Co., Ltd. Agent: Masaru Aoyama Aoyama and two others Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8vA Figure 9

Claims (1)

[Claims] (1) Fixing the base of a springy contact piece with a contact point at the tip to an insulating stand by insert molding, and pressing the vicinity of the contact point of the contact piece with a corner integrally molded on the insulating stand; A contact block characterized by applying initial contact pressure to the contacts.