JPH0312233Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is a 3-prong plug with a ground terminal, which is used for 3-core power cords for power tools, etc., and it does not have to be plugged into a 2-prong outlet. If this is not possible, the present invention relates to an insertion plug with a grounding pole in which the grounding pole tip blade can be rotated and stored inside the plug body.

[Conventional technology]

Conventional three-prong plugs cannot be plugged directly into a general-purpose two-prong outlet, so a special attachment is used. As a result, the plug-in part becomes heavy, which makes it easy to disconnect from the outlet, and the attachment is easy to lose, making it difficult to use and difficult to use.

Recently, a three-pole-to-two-pole conversion plug has been considered, in which the grounding tip of the three-pole plug can be rotated and housed inside the plug body. However, with this type of plug, the connection between the ground wire inside the power cord and the ground terminal blade of the plug is made within the plug body.
The connecting part cannot be visually seen from the outside. Regarding the plug's two current-carrying poles, if there is a poor connection during the connection, the current will be lost, so you can tell right away.
Since it is not possible to visually check whether there is a defect in the connection part of the ground electrode, even if there is a defective connection, it may go unnoticed.
This may lead to serious problems such as electric shock.

[The problem that the idea attempts to solve]

The present invention solves the above-mentioned conventional problems, and does not require any special attachments even when used by plugging into a general two-prong outlet, and also makes it possible to visually see the midway connection point of the ground pole from the outside. Easily determine whether the connection status is good or bad. Furthermore, when used by plugging into a two-pole outlet, the grounding tip blade is rotatably housed inside the plug body, and an external grounding conductor can be easily connected to the tip of the grounding tip blade.

[Means to solve the problem]

The structure of the present invention is a plug in which the grounding tip blade can be rotated and stored inside the plug body, and a female screw is provided inside the tip of the grounding tip tip for connecting the external grounding conductor with a screw. For 3
The feature is that the ground wire from the core cord is connected to the center of the ground electrode tip protruding from the plug body by crimping or soldering.

[Effect]

When using the plug of the present invention by inserting it into a 3-prong outlet, use the plug with the ground terminal blade facing forward. When plugging into a two-pole outlet, rotate the grounding tip blade inside the plug body, connect the external grounding conductor to the female screw inside the tip of the grounding tip, and then connect the external grounding conductor with a screw. , Insert the two-prong energizing electrode tip of the plug into the two-prong receptacle of the outlet.

〔Example〕

Hereinafter, the present invention will be specifically explained with reference to embodiments illustrated in the drawings. Figure 1 shows three plugs of this invention.
FIG. 2 is a side view showing the state in which the plug is inserted into a two-pole outlet, and FIG.
Figure 3 is a front view of Figure 2, and Figures 4 and 5 are
The figure shows a perspective view of the ground pole tip blade, and FIG. 6 shows a front view of the ground pole tip blade.

In the figure, 1 is the plug main body, 2 is a storage part having a U-shaped groove provided in the front part of the plug main body 1, and 3
is a current-carrying electrode tip blade, and 4 is a grounding electrode tip blade, which has a shape like a part of a cylinder cut out,
Its base forms a bearing and is hinged to both walls of the U-shaped groove by a shaft 13, and can be rotated approximately 90 degrees as shown in Figure 1 or Figure 2, when used by plugging into a two-pole outlet. is rotatably housed within the U-shaped groove.

A female thread 8 is attached to the inner side of the tip of the ground pole tip blade 4 for screwing and connecting the external ground conductor 7 with a screw 6. The ground wire 5 from the three-core cord 10 is connected to the center of the ground terminal tip protruding from the plug body 1 by crimping with a protrusion 9 of the tip tip. In addition to this crimp connection,
The connection may be made by soldering. In addition, 11 in the figure shows an outlet, and 12 shows its socket.

[Effect of idea]

As explained above, according to the present invention, even when plugged into a general two-pole outlet, it can be used without requiring any attachment, and the external ground conductor can be easily connected to the ground electrode tip blade.
In addition, since the connection point between the ground pole tip blade and the internal ground wire can be visually observed from the outside, it is easy to determine whether the connection is good or bad, which is highly effective in ensuring safety.

[Brief explanation of drawings]

Figure 1 is a side view showing the plug of the present invention used when inserted into a 3-prong outlet, Figure 2 is a sectional side view showing the plug of the present invention used when inserted into a 2-prong outlet, and Figure 3 is a side view showing the plug of the present invention used when inserted into a 2-prong outlet. FIG. 2 is a front view, FIGS. 4 and 5 are perspective views showing details of the grounding tip blade, and FIG. 6 is a front view of the grounding tip blade. DESCRIPTION OF SYMBOLS 1... Plug body, 2... Ground electrode tip blade housing, 3... Current electrode tip blade, 4... Earth electrode tip blade, 5
...Earth wire, 6...Screw fixing screw, 7...External ground conductor, 8...Female screw with ground tip, 9
...Protrusion for crimping.

Claims (1)

[Scope of utility model registration request] In a 3-pole to 2-pole conversion plug with a grounding pole that allows the grounding tip blade to be rotated and stored inside the plug body, inside the tip of the grounding tip blade,
A female screw is provided to connect the external ground conductor with a screw, and the ground wire from the 3-core power cord is connected by crimping or soldering to the center of the ground terminal tip protruding from the plug body. Features a plug with a grounding pole.