JPS5834664Y2 - Sealed electrical equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sealed electric device in which a base, a terminal, a case, etc. are sealed using heat-welded pellets.

For example, in sealed electromagnetic relays, thermal welding pellets are used to seal the base, case, and terminals at the same time.

This pellet is a plate-shaped pellet made by compressing powdered resin.
Since it is weak, it can be easily damaged by careless handling during installation.

In addition, when the above pellets are used to seal between the base, case, and terminals, the outer surface of the base is completely covered with the pellets and forms a sealing layer, so the identification markings of the terminals etc. on the outer surface of the base can be easily seen. Even if the sealing layer is made of a transparent material, it is impossible to read the identification mark.

In other words, the letters and symbols used for this identification display are usually integrally molded in a convex shape on the outer surface of the base and have the same color as the base, and the seal layer causes diffused reflection of light, which makes it difficult for this type of electromagnetic relay to be used. It is impossible to decipher the display.

The purpose of this invention is to eliminate the above-mentioned drawbacks, prevent damage to heat-welded pellets, and provide a sealed electrical device in which displays such as characters and symbols can be clearly read.

Hereinafter, embodiments of this invention will be described based on the drawings.

In Fig. 1, 1 is a case containing an electric device body (not shown), 2 is a base fitted into the case 1, 3 is a terminal protruding outside the base, and 4 is a seal formed on the base 2. It is a layer.

To form the seal layer 4, heat-welded pellets (hereinafter abbreviated as pellets) 5 made of solidified synthetic resin powder are used as shown in FIG.

A heat-resistant sheet 6 is attached in advance to the outer surface of the pellet 5, and the reinforcing effect of the sheet 6 prevents the pellet 5 from being damaged.

The pellet 5 is provided with a terminal hole 7 passing through the sheet 6, and by inserting the terminal 3 into the terminal hole 7, the pellet 5 is fitted into the case 1 as shown in FIG. and is supported on the base 2.

After the pellets 5 are mounted as shown in FIG. 3, they are heated and melted in a heating furnace.

As a result, a predetermined sealing layer 4 is obtained, and the fitting portions 8 and 9 between the base 2, the case 1, and the terminal 3 are tightly sealed.

Since the seal layer 4 obtained as described above is covered with the sheet 6, it has a good appearance.

As shown in FIGS. 1 and 2, markings 10 such as letters and symbols are provided on the outer surface of the sheet 6 to identify the type of each terminal hole 7, corresponding to each terminal hole 7.

Since this display 10 is formed on the outer surface of the sealing layer 4,
The identification display 10 of each terminal 3 is easy to read.

The display 10 is attached by printing, hot stamping, vacuum forming, or the like.

Of course, instead of these, it can also be formed into a convex shape by press working or by punching.

When the sheet 6 is provided inside the seal layer 4 as shown in FIG.
It is made of a transparent material so that the 0 can be read.

Reading through the seal layer 5 may be difficult due to diffuse reflection of light on the seal layer 5.

However, in the configuration of FIG. 4, if the markings (not shown) on the sheet 6 are punched, the surface color of the sheet 6 is different from that of the base 2, and if the markings are convex, , the parts are colored to make each display easier to read.

Furthermore, since the pellets 5 contain air, they become thinner by being melted.

Therefore, as shown in FIG. 6, by increasing the thickness by the thinning dimension S, the opening outer end surface 11 of the base 2 and the sealing layer 4 are finally formed flush with each other as shown in FIG. You can improve the appearance by doing so.

As described above, according to this invention, it is possible to provide a sealed electromagnetic relay that prevents damage to heat-welded pellets and that can clearly read characters, symbols, etc. that are covered with a sealing layer and cannot be read. can do.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a sealed electrical device according to this invention, Fig. 2 is a perspective view of a sealing means using heat-welded pellets, Fig. 3 is a partially cutaway side view of the same after sealing is completed, FIG. 4 is a partially cutaway side view showing another example of how the sheet is mounted, and FIG. 5 is a partially cutaway side view showing a modified example of how the heat welding pellets are mounted. 5... Heat welding pellet, 6... Sheet, 10... Table small.

Claims (2)

[Scope of utility model registration request] (1) Sealed electrical equipment in which a sheet with characters, symbols, etc. displayed is attached to one side of a heat-welded pellet for sealing parts of electrical equipment that require sealing. (2) The sealed electric device according to claim 1, which is a utility model registration claim, in which a sheet is attached to the outer surface of a heat-welded pellet.