JPS6034770B2 - Manufacturing method of sealed electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a sealed electromagnetic relay, particularly a dip type sealed electromagnetic relay.

Conventionally, in order to make electromagnetic relays sealed, a method was used to seal them by injecting epoxy resin into the gap between the case and the terminal block to prevent resin from entering the contacts, etc. It is difficult to seal electromagnetic relays, and even if they could be sealed, they had the drawbacks of poor productivity and high costs.

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a method for manufacturing a sealed electromagnetic relay that has good productivity and can be reliably sealed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings showing embodiments thereof.

FIG. 1 shows a dip type sealed electromagnetic relay of the present invention, 1 and 2 are an upper case and a lower case made of thermoplastic resin, 3 is a main body equipped with a contact part, an electromagnet part, etc.
Four terminals 4 each consisting of a coil terminal, a movable terminal, a fixed terminal, etc. protrude from both sides of the main body 3.
is connected to the external terminal 5 by spot heating.

The external terminal 5 is fixed to a frame part 6 made of thermoplastic resin by insert molding, and the cases 1 and 2 are adhesively fixed with the frame part 6 in between.

Next, a method of manufacturing the sealed electromagnetic relay having the above structure will be explained.

First, as shown in FIG. 2, the external terminals 5 punched into an appropriate shape are insert-molded into the frame portion 6 in a connected state.

Then, place the main body 3 on the external terminal 5 and each terminal 4
is connected to the protruding part 5a of the external terminal 5 which protrudes inside the frame part 6 by spot welding, and both cases 2 are joined from above and below with the frame part 6 in between so as to cover the reading main body 3. While pressurizing both of the above cases from above and below, the vicinity of the joint is heated with a heater (not shown), and
, 2 are slightly melted and the joints of cases 1 and 2 are glued together to seal the inside of the case. Incidentally, a small hole may be made in advance in either of the cases 1 and 2, and after the two cases are bonded, the gas inside the case may be extracted through this small hole and then filled with inert gas. .

After sealing as described above, each external terminal 5 is separated and bent as shown by the dashed line in FIG. 1 to complete the manufacturing process.

FIG. 3 shows another embodiment of the invention, cases 1' and 2'
The frame portion 6' of the external terminal 5' is provided only on the inner side of the case 1'.
, 2', the appearance is not spoiled, and there is little misalignment when the cases 1' and 2' are glued together.

Note that an adhesive may be appropriately applied to the outside of the joint between the cases 1' and 2' to improve the sealing performance. In both of the above embodiments, the frame is insert-molded with thermoplastic resin, but the frame is made by cold-pressing an adhesive thermosetting resin such as epoxy resin onto the external terminal in a semi-cured state. The case may be sealed by forming a section, joining the case from above and below with the frame section in between, and applying heat and pressure.

In this case, the case does not need to be made of thermoplastic resin. As is clear from the above explanation, since the frame portion is formed of thermoplastic resin or adhesive thermosetting resin on the external terminal in the connected state, the sealing and positioning of the external terminal protruding portion are ensured. By joining the case from above and below between the frame and heating it, the case can be bonded and sealed at the same time, which simplifies the sealing work, improves productivity, and reduces manufacturing costs. be able to.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a sealed electromagnetic relay according to the present invention, FIG. 2 is a perspective view of an external terminal and frame portion thereof, and FIG. 3 is a partial sectional view of another embodiment of the present invention. 1... Upper case, 2... Lower case, 3... Body, 4... Terminal, 5...
...External terminal, 6...Frame part. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. The external terminals punched out in a connected state are integrally held by a frame made of thermoplastic resin or semi-cured adhesive resin, and the contact portion and the protrusion protruding inward from the frame of the external terminal are Connecting each terminal of a main body having an electromagnetic part, and joining two cases having openings having the same shape as the frame so as to cover the main body and with the frame in between,
A method for manufacturing a sealed electromagnetic relay, comprising forming a sealed structure by heating at least the joint portion, and then separating each external terminal.