JPH043412Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a power plug whose base body is coated with a flexible synthetic resin.

(Prior art) So-called double-molded cap-type power plugs have been known in the past, in which a plug blade is inserted and held in a base made of a material with excellent heat resistance, and this is covered with a flexible synthetic resin outer shell. ing. Among them, a horizontal type with a cord extending perpendicularly to the protruding direction of the plug blade is, for example, as shown in Fig. 3, a protrusion b is provided on the outer periphery of a base body a, There is one in which the groove c is filled with a part of the synthetic resin outer skin d, and the synthetic resin outer skin d and the base body a are engaged. Such a plug has the advantage that the synthetic resin outer cover d does not come off and peel off from the base body a when it is pulled out from the outlet in the direction of arrow A in the figure (for example, see Japanese Utility Model Publication No. 55-20069). .

In addition to the above-mentioned method, for example, as shown in FIG. 4, by providing a hole e in the protrusion b, the synthetic resin near the exposed surface of the base body a is bitten into the hole e, and the synthetic resin is combined with the base body a. There is a power plug whose resin outer cover d is firmly attached.

(Problem to be solved by the invention) However, in the case of the former plug, it is difficult to fill the grooves c with the synthetic resin outer skin d during manufacturing, and in the case of the latter plug, it is difficult to fill the grooves c and the protrusions. Since it is difficult to fill the holes e provided in the grooves b with the synthetic resin, spaces are likely to be formed between the synthetic resin outer skin d and the grooves c, resulting in variations in quality. .

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power plug that can reliably and firmly integrate the synthetic resin outer cover and the base.

(Means for Solving the Problems) In order to achieve the above object, the power plug of the present invention has a plug blade inserted through and held in a base made of a material with good heat resistance, and the outer periphery of the base except for the insertion tip of the plug blade. and a plug in which the connection part between the plug blade and the conductor part of the cord is covered with a flexible synthetic resin outer skin,
At least one concave groove is formed on the outer circumferential surface of the base body along the protruding direction of the plug blade, and a flange portion extending in the circumferential direction is provided on the outer circumferential surface of the base body; It is cut out at the groove, and the cutout end is made to cover the groove, and the synthetic resin outer skin is filled and engaged between the groove and the cutout end of the flange.

In addition, for the same purpose, the power plug of the present invention is
A flange extending in the circumferential direction is provided on the outer peripheral surface of the base body, one or more through holes are formed in the flange, and the periphery of the through hole is cut out on the outer periphery side of the flange. The synthetic resin outer skin may be filled and engaged between the inside of the through hole and the notch.

(Function) In the power plug according to claim 1, since the flange is cut out at the groove,
When covering the base body with the synthetic resin outer skin, the synthetic resin is not hindered by the flange and enters the entire groove without any gaps. The concave groove increases the contact area between the base and the synthetic resin outer skin, and the notched end of the flange bites into the synthetic resin outer skin, so that the base and the synthetic resin outer skin are firmly integrated.

In addition, in the power plug according to claim 2, a through hole is formed in the flange, and the peripheral part of the through hole is cut out on the outer peripheral edge side of the flange. When covering the substrate with the resin, the synthetic resin smoothly enters the through holes of the flange and between the notches without any gaps. Since the notched end of the through hole bites into the synthetic resin outer cover, the base body and the synthetic resin outer cover are firmly integrated.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIGS. 1a to 1c schematically show the overall structure of a power plug 1 according to the invention of claim 1. FIG.

In the figure, the power plug 1 has a plug blade 3 inserted and held in a base body 2, and a tip 3 of the plug blade 3.
The outer periphery of the base body 2 except for b and the connection portion 4b between the plug blade 3 and the conductor portion 4a of the cord 4 are covered with a flexible synthetic resin outer skin 5.

The base body 2 is formed into a substantially block shape from a hard resin having excellent heat resistance. A pair of holding parts 2a, 2a for penetrating and holding the plug blade 3 are vertically provided in the base 2, and four grooves 2c are formed on the outer peripheral surface of the plug blade 3. It is formed along the protruding direction. These grooves 2c... are arranged so that two grooves each face each other. Further, on the outer circumferential surface of the base body 2, a flange 2b extending in the circumferential direction is provided, and the flange 2b is cut out at the grooves 2c, and the notched ends 2d are connected to the grooves 2c. It is made to cover the groove 2c... moreover,
A groove 2e is provided on the upper surface of the base body 2 between the holding parts 2a, and both ends of the groove 2e are
Of the four grooves 2c on the outer circumferential surface described above, the two grooves 2c, 2c facing each other are in communication with each other. Note that the number of the grooves 2c described above is not limited to four, and may be one to three, or five or more. Further, the groove 2e does not necessarily need to be provided.

According to this structure, when the base body 2 is covered with the synthetic resin outer skin 5, the synthetic resin is cut out at the grooves 2c...
It enters the entire inside of the concave groove 2c without any gap without being obstructed by the groove b. Moreover, by the groove 2e,
Since the contact area between the base body 2 and the synthetic resin outer skin 5 is widened, and the cutout end 2d of the collar portion 2b bites into the synthetic resin outer skin 5, the base body 2 and the synthetic resin outer skin 5 are firmly integrated. Therefore, the filling state of the synthetic resin outer skin 5 between the flange portion 2b and the exposed surface 2g of the base body 2 is improved, and the synthetic resin outer skin 5 is filled with the base body 2.
This makes it more difficult to peel off.

FIGS. 2a to 2c schematically show the overall configuration of the power plug 11 according to the second aspect of the invention. Note that the same components as those of the power plug 1 according to the invention of claim 1 are given the same reference numerals, and only the differences will be described in detail here.

The base body 2 of the power plug 11 has a circumferentially protruding flange 2b on its outer peripheral surface, and two through holes 6, 6 are formed in the flange 2b. The peripheral part is cut out on the outer peripheral edge side of the collar part 2b, and the inside of these through holes 6, 6 and the cutout part 2 are cut out.
The synthetic resin outer skin 5 is filled and engaged between the steps h. In the illustrated example, the through holes 6, 6 are formed in a substantially rectangular shape along the circumferential direction of the base body 2, but they may have other shapes such as a circle, an ellipse, an oval, or a polygon. It may be hot. Further, the flange portion 2b partially extends outward from the base body 2 at the portion where the through holes 6, 6 are formed, but the flange portion 2b has the same width over the entire circumference of the base body 2. may have been done. Furthermore, the positions and number of through holes 6 are not limited to the illustrated example. The other configurations are the same as the power plug 1 according to the invention of claim 1.

In the case of the power plug 11 constructed as described above, when covering the base body 2 with the synthetic resin outer skin 5, the synthetic resin smoothly covers the inside of the through holes 6, 6 of the collar portion 2b and the gaps between the notches 2h, 2h. It goes in without a hitch. Since the cutout ends 2d, 2d of the through holes 6, 6 bite into the synthetic resin outer skin, the base body 2 and the synthetic resin outer skin 5 are firmly integrated, and the synthetic resin outer skin 5 becomes more difficult to peel off than the base body 2.

(Effects of the invention) As described above, in the power plug of the invention, the synthetic resin outer cover is reliably filled inside the groove or the through hole of the base and between the notched ends of the flange, and The ends dig into the synthetic resin outer shell, so
The base body and the synthetic resin outer skin are firmly integrated. Therefore, the synthetic resin outer skin is less likely to peel off than the base, and there is no variation in quality.

[Brief explanation of the drawing]

1A to 1C show an embodiment of the power plug according to the invention of claim 1, FIG. FIG. 2c is a plan view of the same, FIGS. 2a to 2c show an embodiment of the power plug according to the invention of claim 2, and FIG. 2a is a front view of the power plug showing the synthetic resin outer cover with phantom lines, Figure b is a side view of the same, Figure c is a plan view of the same, and Figures 3 and 4 are side views showing a conventional power plug. 1, 11...power plug, 2...base, 2b...
...Flame, 2c...Concave groove, 2d...Notch end, 2h
...Notch, 3...Blug blade, 3b...Tip, 4...
...Cord, 4a...Conductor part, 4b...Connection part, 5
...Synthetic resin outer skin, 6...Through holes.

Claims (1)

[Claims for Utility Model Registration] 1. A plug blade is inserted and held in a base made of a material with good heat resistance, and the outer periphery of the base body and the connecting portion between the plug blade and the conductor portion of the cord, excluding the insertion tip of the plug blade, are In the plug covered with a flexible synthetic resin outer skin, at least one groove is formed on the outer peripheral surface of the base body along the protruding direction of the plug blade, and at least one groove is formed along the outer peripheral surface of the base body in the circumferential direction. A flange is provided in a protruding manner, and the flange is notched at the groove, and the notch end is made to cover the groove, and the synthetic material is formed between the groove and the notch end of the flange. A power plug characterized in that a resin outer cover is filled and engaged. 2. A plug blade is inserted and held in a base made of a material with good heat resistance, and the outer periphery of the base except for the insertion tip of the plug blade and the connection part between the plug blade and the conductor part of the cord are covered with a flexible synthetic resin outer skin. In the plug, a flange extending in the circumferential direction is provided on the outer peripheral surface of the base body, one or more through holes are formed in the flange, and the peripheral part of the through hole is formed in the flange. A power plug characterized in that the outer peripheral edge side is notched, and the synthetic resin outer cover is filled and engaged between the inside of the through hole and the notch.