JPS5920769Y2 - electrical plug - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of a power plug.

Conventional general molded power plugs are mostly made of soft vinyl chloride, etc.
In particular, if abnormal heat is generated due to poor contact such as poor fitting with the outlet, the material on the side toward outlet 1 should be phenol,
Since materials with good heat resistance such as urea are used, the vinyl chloride of the power plug starts to carbonize, and eventually the insulating part between the plug blades carbonizes and connects, causing current leakage. As a result, there is a possibility of an accident resulting in smoke and ignition all at once, so it is not desirable to use an integrally molded vinyl chloride power plug for equipment with a large rated current and a long operating time.

Therefore, as a method to improve the heat resistance performance of power plugs, the insulating wall between the attachment part of the plug blade and the plug blade is made of a base molded from a resin (such as phenol, urea, polyamide, etc.) that has better heat resistance than vinyl chloride. A power plug whose outer periphery is integrally molded with flexible resin (vinyl chloride) has been devised and put into practical use, but peeling between the base and flexible resin tends to occur, and when you press it with your finger, the gap may be removed. It was dark.

As a countermeasure to this problem, plugs with grooves have been considered and put into practical use, but the present invention provides a power plug structure that is even more effective.

The structure of the power plug of the present invention will be explained below.

Fig. 1 is a cross-sectional view of one embodiment of the present invention, Fig. 2 is a Y-Y sectional view of Fig. 1, Fig. 3 is a XX sectional view of Fig. 1, and Fig. 4 is an implementation of Fig. 1. FIG. 5 is a perspective view of the base body in the embodiment shown in FIG. 1, and FIGS.
The figure is a perspective view of another embodiment of the base body, and FIGS. 8, 9, and 10 are external views of other embodiments.

1 is a plug body made of flexible resin, 2 is a cord protector for improving the bending characteristics of the cord, 3 is a power cord, 4 and 4' are cords, and 5 is made of a resin with better heat resistance than the plug body 1. With the base body, the plug blades 6, 6'
At least one of the four portions 5a is provided which opens toward the light end on the insertion side.

Further, a plug blade 6 is provided on the opposite side of the base body 5 from the recess 5a.
6' is provided with an insulating wall 5b that separates the space between them.

The power cord 3 is separated from the sheath and divided into cords 4 and 4', which are connected to the plug blades 6, 6' by soldering or crimping.

The plug blades 6 and 6' are fixed to the plug blade holes 7 and 7' of the base body 5 (either integrally molded or inserted into the holes after molding).

) has been done. This invention power plug has more than 3 power cords
, 4゜4' plug blades 6, 6', and a base body 5 are integrally molded from flexible resin to form a plug body. Holes 8 are provided at the top to improve the flow of resin to 7, 7' and portion 1a of the plug body, through which the flexible resin flows during molding of the plug body.

(Depending on the location of the sprue, this may not be necessary.

) As described above, in the present invention, since the base body 5 is provided with the concave part 5a, the flexible resin enters the concave part 5a and is connected at the part 1a, so that the base body 5 is smaller than the conventional one shown in FIG.
Since the contact distance between the flexible resin and the plug body 1 is short, peeling due to external force is reduced, and safety is improved.

Moreover, the base body and the flexible resin are also securely held.

Other embodiments of the base body are shown in FIGS. 6 and 7.

The one shown in FIG. 6 is provided with an insulating wall 9 between the plug blades.

Further, in FIG. 7, the hole 8 is made larger to improve the flow of resin.

Figures 8 and 9 are examples of application to plugs of other shapes.
The figure shows 2 P 250 V 20 A, and the figure 9 shows 3 P.
Shows the plug shape rated for 250V 2OA.

The structure of the internal base body is basically the same as that explained in FIG.

In Fig. 8, 10 is the plug body, 11 is the base, 12゜13 is the plug blade, and in Fig. 9, 10 is the plug body, 11 is the base, 14
．． 15.16 indicates the plug blade.

In the example shown in Figure 9, the base bodies of the three plug blades are all separated, but for plugs with three or more poles, the purpose can be achieved without separating all the blades, as shown in Figure 10. There is.

According to the present invention, not only the heat resistance of the power plug is improved, but also the peeling of the base that improves heat resistance and the flexible resin forming the plug body is prevented, and its practical value is great. be.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of one embodiment of the present invention, Fig. 2 is a Y-Y sectional view of Fig. 1, Fig. 3 is a XX sectional view of Fig. 1, and Fig. 4 is a cross-sectional view of an embodiment of the present invention.
The figures are an external view of the embodiment shown in Fig. 1 as seen from the direction of the plug blade, Fig. 5 is a perspective view of the base body in the embodiment shown in Fig. 1, and Figs. 6 and 7.
The figures are perspective views of other embodiments of the base body, FIGS. 8, 9, and 10 are external views of other embodiments, and FIG. 11 is an external view of a conventional example. 1: Plug body made of flexible resin, 3: Power cord,
4.4': cord, 5: base, 5a: recess, 5b: insulating wall, 6.6': plug blade, 7.7', plug blade hole.

Claims (1)

[Scope of utility model registration request] A plurality of plug blades are held in a base made of a material with better heat resistance than the material of the plug body, and an insulating wall integral with the base is provided between each plug blade, and at least one place between each plug blade of the base is provided. A recess is provided that opens toward the tip of the plug blade, and the outer periphery of the plug blade, except for the insertion part, is covered with a flexible synthetic resin outer skin to fill the recess in the base body, as seen from the side where the plug blade is inserted. A power plug characterized by having a structure in which the power source appears to be separated into two or more power points.