JPH0247580Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power adapter, and more particularly to a power adapter for connecting a three-pole plug whose one pole is used for grounding to a two-pole power outlet.

[Conventional technology]

A conventional power adapter is shown in FIG. This power supply adapter has an adapter body 1 integrally molded with thermoplastic vinyl chloride resin, etc., and includes a grounding cylindrical terminal 20 to which a grounding lead wire 2 is connected, and a plug terminal 2.
2 and a socket terminal 23 at the ends thereof, and an insulating base 30 having a pair of insertion holes 31 through which plug terminals of a plug made of hard plastic are inserted is arranged in front of the socket terminals 23. However, except for the plug terminal 22, the adapter body 1 is integrally molded from the aforementioned vinyl chloride resin or the like. In the above power adapter, insert the power plug terminal of the 3-prong plug into the insertion port 31a, and insert the ground terminal into the insertion port 31a.
A predetermined electrical connection is obtained by inserting it into b.

[Problem that the invention attempts to solve]

However, according to the conventional power supply adapter, the adapter body 1 is integrally molded from vinyl chloride resin or the like, so that the adapter body 1 has temperature dependence. Therefore, the fitting force of the socket terminal 23 is not constant, and since the socket terminal 23 and the adapter body 1 are in direct contact, there is a problem that the fitting force of the socket terminal is not constant depending on the molding conditions at the time of molding. Ta.

When manufacturing a conventional power adapter, the base 30 is inserted into a core bar (not shown), and then the grounding cylindrical terminal 20 and the socket terminal 2 of the double-headed terminal 21 are inserted.
3, the core metal is placed and held in the cavity of the mold, and then vinyl chloride resin or the like is injected into the cavity to integrally form the adapter body 1.

Here, in order to stabilize the fitting force of the socket terminal 23, the adapter body 1, which is in direct contact with the socket terminal 23, must be held in the mold until it is completely cooled. Therefore, there were problems in that the molding cycle became long and the productivity was low.

On the other hand, there are the following types of power adapters that are different from the power adapters described above. That is, a cylindrical grounding terminal and a pair of double-headed terminals consisting of a plug terminal and a socket terminal are inserted into one of the two-part adapter body molded from thermosetting resin at predetermined positions, and then the other part of the two-part adapter body is inserted into the other part. There is an assembly type that fits together and tightens the screws.
However, this poses a danger when using the adapter because the screws may loosen during use and the terminals may be exposed or moved.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a power supply adapter in which the fitting force of the socket terminal does not vary with temperature.

A second object of the present invention is to provide a power supply adapter in which the fitting force of the socket terminal does not vary depending on manufacturing conditions.

A third objective of the present invention is to provide a power adapter that does not require long manufacturing time.

A fourth object of the present invention is to provide a power adapter that is safe to use.

A fifth object of the present invention is to provide a power adapter that is easy to manufacture.

[Means for solving problems]

In order to achieve the above object, the present invention fixes a pair of double-headed terminals having a plug terminal and a socket terminal at both ends to an insulating base in parallel in a predetermined positional relationship, and connects the connecting part to which the grounding lead wire is connected. A grounding terminal having contact parts at both ends into which the grounding terminal of a 3-pole plug is fitted is housed in the insulating body, and the insulating base and the insulating body are integrated by fitting, and a pair of socket terminals are inserted into the insulating body. A power adapter is provided that is housed in a pair of housing chambers formed inside.

That is, the power adapter of the present invention includes the following means.

(1) A pair of double-headed terminals and a grounding terminal A pair of double-headed terminals that have a plug terminal and a socket terminal on both ends, and a contact part where the connection part to which the grounding lead wire is connected and the grounding terminal of the three-pole plug fit together. It has a ground terminal with on both ends. The plug terminal is a terminal that is inserted into a power outlet, and the socket terminal is a terminal that accepts a three-pole power plug terminal. On the other hand, the connection of the ground lead wire to the ground terminal is performed by crimping, but the connection is not limited to this.

(2) Insulating base This is for holding the pair of double-headed terminals in parallel in a predetermined positional relationship.

(3) Insulating body: a pair of socket terminal accommodating chambers that separately accommodate the socket terminals of the pair of double-headed terminals, a grounding terminal accommodating section that accommodates the grounding terminal, and a grounding lead wire that is drawn out to the outside. It has a lead wire passage hole and forms an insulating case by fitting with the insulating base.

Here, it is preferable that the insulating base has a pair of protruding pieces located in parallel inside the socket terminal of the pair of double-headed terminals, and the insulating body has a pair of protruding pieces that correspond to the pair of protruding pieces. It is preferable to have a wall member of. As a result, the protruding piece and the wall member can constitute a side wall of the socket terminal accommodating chamber. Furthermore,
The grounding lead wire is configured to be held between the pair of protruding pieces, and the base member is configured to include:
It is preferable that the insulating body has a pair of elastically deformable holding pieces on both sides, and that the insulating main body has fitting surfaces on both outer surfaces into which the pair of holding pieces are fitted.

〔Example〕

The power adapter of the present invention will be explained in detail below.

1 to 4 show an embodiment of the present invention,
The power adapter 1 includes a pair of double-headed terminals 21 having a plug terminal 22 and a socket terminal 23 at both ends.
and a grounding terminal 20 to which a lead wire 2 is connected. Insulating base 40 and insulating main body 6 to be described later
0 is a thermoplastic hard plastic resin, e.g.
The plug terminal 22 is formed from PPO resin (polyphenylene oxide resin) or the like, and the plug terminal 22 protrudes from one side of the assembly assembled by fitting the two together, and the ground terminal 1 of the plug 100 is attached to the other side.
01 and plug terminal 102 are inserted into the insertion holes 3 and 4.
has. Through these insertion openings 3 and 4, the ground terminal 101 and plug terminal 102 of the plug 100 are inserted and fitted into the ground terminal 20 and socket terminal 23 housed and fixed in the power adapter 1, and an electrical connection is established. be exposed. The plug terminal 22 of the power adapter 1 is inserted and fitted into a power outlet (not shown) to supply power to an electrical device to which the plug 100 is connected. The ground terminal 20 is the second
As shown in FIG. b, it has a pair of upright pieces 27 formed by pressing a conductive plate and bending both sides of the base. The tip of this rising piece 27 is the plug 1
The grounding terminal 101 of No. 00 is used as a contact portion to be inserted and fitted, and the rear end is formed with a parallel end portion 28 in which the rising piece 27 is made parallel, and a lead wire connection portion 29 in which the lead wire 2 is crimped. . The double-headed terminal 21 is constructed by folding back a single conductive plate, and has a plug terminal 22 at one end and a socket terminal 23 at the other end. As shown in FIG. 2a and FIG. 4b, the insulating base 40 is
Base 41 that fixes the middle part of the pair of double-headed terminals 21
and holding pieces 42 formed on both sides of the base 41;
It has a locking protrusion 43 formed inside the holding piece 42, a protruding piece 44 formed approximately at the center of the base 41, and a protrusion 45 formed between the protruding pieces 44. on the other hand,
As shown in FIGS. 2c and 3, the insulating body 60 has an insertion opening 3 for the grounding terminal 101 of the plug 100 and an insertion opening 4 for the pair of plug terminals 102 on one side, and has an overall shape. It is formed into a roughly box shape. The interior adjacent to the insertion opening 3 has a grounding terminal accommodating portion 61 for accommodating the earthing terminal 20, and the earthing wall 62 constituting this accommodating portion, and the interior adjacent to the other insertion opening 4 has a socket terminal 23. A storage chamber 63 and a horizontal wall 64 that constitutes this storage chamber.
It has an upright wall 65, a lead wire outlet 66 for holding the lead wire 2 bent at a substantially right angle, and a fitting part 67 into which the base 41 of the insulating base 40 is fitted. It has a grip part 68 formed with a plurality of convex parts, and a recess 69 into which the holding piece 42 of the insulating base 40 fits, and the recess 69 is connected to the holding piece 42.
A locking recess 70 is formed in which the locking protrusion 43 is locked.

The insulating base 40 and the insulating main body 60 described above are pre-molded, and the power adapter 1
is constructed by inserting and arranging the components described above and assembling them.

The procedure for assembling the power supply adapter 1 will be explained below.

(1) Insert the grounding terminal 20 into the grounding terminal accommodating portion 61 of the insulating body 60. Ground terminal 20
is a part of the peripheral wall of the insulating body 60 and the ground wall 62
It is accommodated in a ground terminal accommodation chamber 61 configured by.

(2) Bend the lead wire 2 connected to the ground terminal 20 at a substantially right angle along the lead wire outlet 66 of the insulating body 60, and insert the lead wire 2 into the lead wire outlet 66.

(3) Insulating base 4 to which a pair of double-headed terminals 21 is fixed
0 socket terminal 23 on the peripheral wall of the insulating body 60,
The socket terminal is inserted so as to be accommodated in the socket terminal accommodation chamber 63 formed by the horizontal wall 64 and the rising wall 65.

(4) With the insertion of the socket terminal 23, the base 41 of the insulating base 40 fits into the fitting part 67 of the insulating main body 60, the holding piece 42 of the insulating base 40 engages with the recess 69 of the insulating main body 60, The locking protrusion 43 of the holding piece 42 locks into the locking recess 70 of the recess 69 .

(5) When the insulating base 40 is fitted, the lead wire 2 is placed between the pair of protruding pieces 44 of the insulating base 40, and the tip of the protruding piece 44 is placed behind the grounding terminal 20 housed in the insulating body 60. abutting the end 28;
Fix the grounding terminal 20 (see Figure 4a).

(6) The protruding piece 44 of the insulating base 40 is connected to the insulating body 60
horizontal wall 6 forming a socket terminal accommodation chamber 63;
4 and the upright wall 65 to insulate and protect the socket terminal 23 accommodated in the socket terminal accommodating chamber 63.

(7) The lead wire 2 drawn out to the lead wire outlet 66 of the insulating body 60 is fixed by engagement with the outlet 66 and the insulating coating of the protrusion 45 of the insulating base 40.

(8) After assembling in this manner, the insulating base 40 and the insulating body 60 are melted and integrated by any means such as an ultrasonic welder, a high-frequency welder, or induction heating.

[Effect of idea]

As explained above, the power adapter of the present invention is expected to have the following effects.

(1) In order to assemble the adapter by injection molding the insulation body and insulation base in advance, injection molding,
Assembly work will be mechanized and unmanned production will be possible. This increases productivity and improves assembly.

(2) Since the grounding terminal and socket terminal are housed within the insulating body with the outer periphery forming a gap, they are not affected by the temperature dependence of the insulating body, and the fitting of each terminal is based on the mating force of the terminals alone. Become the same. This stabilizes the fitting force.

(3) The accommodation chamber for the socket terminal inserted into the insulating body is composed of the peripheral wall, internal horizontal wall and rising wall of the insulating body, and the protruding piece of the insulating base. Therefore, the lead wire connected to the ground terminal for surrounding the outer periphery of the socket terminal and insulating the socket terminal can be drawn out to the outside by passing between the socket terminals. This allows for miniaturization.

(4) Since the grounding lead wire is placed between the protruding pieces of the insulating base, the insulation inside the power adapter is double-layered between the lead wire's insulation coating and the protruding piece, improving dielectric strength.

Therefore, according to claim 1, the effect of (1) is obtained, the effect of (2) and (3) is obtained according to claim 2, and the effect of (4) is obtained according to claim 3. ) can be obtained, and according to claim 4, the effect (1) can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the power adapter of the present invention and the plug inserted into the adapter;
Figures 2a, b, and c are exploded perspective views of the power adapter of the present invention, Figure 3 is a partial cross-sectional perspective view of the insulating body of the power adapter of the present invention, and Figure 4a is Figure 1A-A. FIG. 4B is a plan view of the insulating base of the power adapter of the present invention, and FIG. 5 is a cutaway perspective view of the conventional power adapter. Explanation of symbols, 1... Power adapter, 2...
Grounding lead wire, 3... Grounding plug terminal insertion slot, 4... Power plug terminal insertion slot, 20...
Earth terminal, 21...Double-headed terminal, 22...Plug terminal, 23...Socket terminal, 40...Insulating base, 41...Base, 42...Holding piece, 43...
Locking protrusion, 44...Protrusion piece, 45...Protrusion, 60
... Insulation body, 61 ... Ground terminal accommodation chamber, 6
2...Earth wall, 63...Socket terminal housing chamber,
64... Horizontal wall, 65... Upright wall, 66... Lead wire outlet, 67... Fitting part, 68... Gripping part, 69... Recessed part, 70... Locking recessed part, 100...
...3-pole plug, 101...ground plug terminal,
102...Power plug terminal.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A power adapter for connecting a three-pole plug with a one-pole grounding plug to a two-pole power outlet, a pair of double-ended terminals having a plug terminal and a socket terminal at both ends. , and a grounding terminal having contact parts at both ends to which the grounding lead wire is connected and the one-pole grounding plug is fitted, and the pair of double-headed terminals are held in parallel in a predetermined positional relationship. an insulating base, a pair of socket terminal accommodating chambers for separately accommodating the socket terminals of the pair of double-headed terminals, a grounding terminal accommodating section for accommodating the grounding terminal, and a lead for drawing out the grounding lead wire to the outside. A power supply adapter comprising an insulating body having a wire passage hole and forming an insulating case by fitting and integrating with the insulating base. (2) The insulating base has a pair of protruding pieces located in parallel inside the socket terminal of the pair of double-headed terminals, and the insulating body has a pair of wall members corresponding to the pair of protruding pieces. The power adapter according to claim 1, further comprising: a side wall of the socket terminal accommodating chamber formed by the projecting piece and the wall member. (3) The power supply adapter according to claim 1, wherein the grounding lead wire is sandwiched between the pair of protruding pieces. (4) The base member has a pair of elastically deformable holding pieces on both sides, and the insulating body has fitting surfaces on both outer surfaces that fit with the pair of holding pieces. Power adapter listed.