JPH09213417A - Output terminal device for ac adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent wrong insertion of a converting plug by providing a wrong insertion preventing protruded part in an insertion part of the converting plug, also forming a recessed part receiving the protruded part in a corresponding part of an output terminal of an AC adapter. SOLUTION: A circular wrong insertion preventing protruded part 2 is formed in the same direction to pin terminals 5a, 5b functioning as a pair of connector pins of a converting plug 1a specifying +, - polarity. ON the other hand, in a connection part 7 of an output terminal 3 corresponding to an output terminal of an AC adapter, connecting holes 6a, 6b inserting the pins 5a, 5b and a recessed part 4 receiving the protruded part 2 are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an output terminal device for an AC adapter used as a power source for various electronic devices.

[0002]

2. Description of the Related Art As shown in FIG.
A blade 10 to be inserted into an outlet of a commercial power source is provided, and as is well known, an electronic circuit such as a rectifying diode and a smoothing capacitor is provided therein, whereby AC is converted to DC and the output terminal 3'is removed to a predetermined position. It is configured to be able to supply direct current to the electronic devices of.

In this case, for example, if the electronic equipment is different, A
The output terminal 3'installed in advance on the C adapter body 11 may not be compatible because the size of the opposite insertion portion is different.

For this reason, several conversion plugs 1'of various sizes which can be freely attached to and detached from the output terminal 3'are prepared, and the conversion plug 1'having a diameter of the terminal 8'corresponding to an electronic device is selected and output. There is one in which a pair of + and-pin terminals 5a 'and 5b' are inserted into the insertion portion of the terminal 3'to make it compatible with various electronic devices, and this usage is a general usage.

In addition, as another usage method, depending on the device, rarely, there is a case where the insertion is intentionally switched between positive and reverse to switch between + and −.

[0006]

However, in the former general usage, there are cases where the insertion is mistakenly reversed, and in that case, the device does not operate,
There was a problem that it might lead to equipment failure.

The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide an AC adapter in which the pin terminals for inserting the conversion plug into the output terminals of the AC adapter are prevented from being erroneously inserted. An object is to provide an output terminal device of the insertion direction designation type.

[0008]

According to the present invention, an output terminal 3 provided on the AC adapter side and a conversion plug 1 which is detachable from the output terminal 3 via respective pin terminals 5a and 5b for insertion are provided. The conversion plug 1 is provided with a protrusion 2 for preventing erroneous insertion of the pin terminals 5a and 5b, and the connecting portion 7 of the output terminal 3 is provided with a recess 4 for receiving the protrusion 2 in a proper polarity state. To achieve the above object.

[0009]

1 to 5 show an embodiment of the present invention. Of these, FIG. 1 is a perspective view showing a usage state of the conversion plug, FIG. 2 is a bottom view of a pin terminal portion for inserting the conversion plug, FIG. 3 is a plan view and a side view of an output terminal of an AC adapter, and FIG. FIG. 5 is a side view showing a schematic internal structure of the plug, and FIG. 5 is a side sectional view of the pin terminal structure.

As a characteristic feature of the present invention, however, as shown in FIGS. 1 to 3, a protrusion 2 for preventing erroneous insertion is formed at the insertion portion of the conversion plug 1 and an AC adapter (not shown). The concave portion 4 for receiving the protrusion 2 is formed at the corresponding portion of the output terminal 3).

That is, when the positive and negative polarities are specified, when the pin terminals 5a and 5b functioning as a pair of connector pins of the conversion plug 1 are inserted into the connecting portion 7 of the output terminal 3, the protruding portion 2 is The pin terminals 5a and 5b can be inserted into the recesses 4 and into the holes 6a and 6b for predetermined connection with proper polarities.

In this case, the protrusion 2 is provided in the same direction as the pin terminals 5a and 5b and protrudes from the outer periphery of the circular shape, and the recess 4 is formed at the corresponding position. It is needless to say that the design is not limited to the embodiment, and the design can be appropriately changed within the range based on the spirit of the present invention.

The protrusion 2 is made of an insulating resin. Usually, the resin-made L-shaped body 1a of the conversion plug 1
Is formed integrally with.

Needless to say, when the polarities are reversed and used, the conventional conversion plug shown in FIG. 6 having no protrusion 2 may be used.

In addition, reference numeral 8 in the drawing denotes a terminal of the conversion plug 1,
The pin terminals 5a and 5b extend substantially at right angles.
The terminal 8 side is connected to an electronic device (not shown),
The conversion plugs 1 having different terminal diameters are selected and used according to the type of electronic device.

The terminal 8 and the pin terminals 5a and 5b are
As is well known, they are connected in the main body 1a as shown in FIG.

As shown in FIG. 5, the pin terminals 5a and 5b are located at the roots of the pin terminals 5a and 5b.
A bent portion 5d that closes the hole 5c inside the a and 5b is formed. The root portions of the pin terminals 5a and 5b are embedded in the resin main body 1a as shown in FIG. Therefore, at the time of injection molding, the resin is prevented from entering the hole 5c.
It can be blocked by d.

[0018]

As described above, according to the present invention, since the conversion plug is provided with the protrusion 2 for preventing erroneous insertion, when the polarity is determined, the protrusion 2 is provided with the recess 4 of the output terminal 3 of the AC adapter. Since the respective pin terminals 5a and 5b may be inserted into the output terminal 3 side in accordance with the above, erroneous insertion of the conversion plug 1 can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is a bottom view of the conversion plug used in the present invention.

FIG. 3 is a plan view and a side view of an output terminal of the AC adapter used in the present invention.

FIG. 4 is an explanatory diagram showing a connection state between a terminal and a pin terminal of a conversion plug used in the present invention.

FIG. 5 is a side sectional view of a pin terminal.

FIG. 6 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Conversion Plug 1a Main Body 2 Projection 3 Output Terminal 4 Recess 5a, 5b Pin Terminal 5c Hole 5d Bent 6a, 6b Connection Hole 7 Connection 8 Terminal

Claims (1)

[Claims] 1. An output terminal (3) provided on the side of an AC adapter, and a conversion plug (1) which is detachable from the output terminal (3) via respective pin terminals (5a), (5b) for insertion. And a projection (2) for preventing the incorrect insertion of the pin terminals (5a) and (5b) in the conversion plug (1), and a connecting portion (7) of the output terminal (3). An output terminal device for an AC adapter, characterized in that a recess (4) is formed to receive the protrusion (2) in a proper polarity state.