JPS6337466B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an adapter plug having a three-pole plug portion on the front end side and a two-pole jack portion on the rear end side.

For example, when listening to stereo audio through earphones, the adapter plug mentioned above is used because the earphones have two poles, so if you insert the earphone plug into the audio set's socket, you can hear the stereo sound from one side. Therefore, an adapter plug is used to convert the 3-pole to 2-pole so that both sounds can be heard, but it requires a number of connection terminals to be built into the insulating cylinder of the jack. There are problems in that it is troublesome to assemble the connection terminals, and it is troublesome to make the connection terminals.

The present invention has been made in order to solve these problems, and the connecting terminal is inserted into the insulating outer cylinder of the jack part and assembled. The purpose is to make it a single member so that it can be manufactured and assembled easily.

An adapter plug for achieving this purpose has a three-pole plug part on the front end side and a two-pole jack part on the rear end side, and has a spring inside the insulating outer cylinder of the jack part. A connecting terminal is made by punching out a flexible metal plate and having terminal pieces at both the front and rear ends, and the terminal piece on the front end side is connected to two contact pieces, one long and the other short, facing each other on the left and right. The long contact piece is pressed against the rear end of the second pole of the plug part, and the short contact piece is pressed against the rear end of the inner pole of the plug part, and the insulation is removed. It is assembled and held in a cylinder, and the terminal piece on the rear end side of the connecting terminal is a spring lug that presses against the tip at the tip of a two-pole plug inserted into the jack.

Next, an example of implementation will be described in detail with reference to the drawings.

FIG. 1 shows a complete longitudinal side view of an adapter plug A according to the invention. In the same figure,
Reference numeral a denotes a plug portion, which is constructed by fitting a connecting fitting 2 into the rear end portion of a main body 1 of the plug portion shown in FIGS. 2 and 3. As shown in FIG. 4, the plug main body 1 is a chip 1 machined from a metal material.
0, a tip pin 11 made of a metal material which is connected to the tip 10 and serves as an inner pole so as to protrude rearward from the rear end surface thereof, and a long sleeve having a large diameter at the front end and a reduced diameter at the rear end. an outer cylindrical sleeve 12 made of a metal material, which is disposed so as to surround the tip pin 11 and serves as the outer pole of the second pole; An outer cylindrical sleeve 13 made of a metal material serving as an outer pole is integrally insert-molded with a synthetic resin material 14 insulating them to form a normal three-pole plug shape.

Referring again to FIG. 1, reference numeral b denotes a jack part connected to the rear end side of the plug part a, which is molded into a cylindrical shape from synthetic resin and whose front end is connected to the connecting fitting 2 of the plug part a.
The insulating outer cylinder 30 is assembled into the insulating outer cylinder 30, and the outer insulating outer cylinder 30 is formed into a cylindrical shape from a metal material and fitted onto the outer periphery of the insulating outer cylinder 30, and the front end of the assembly is fitted into the connecting fitting 2 of the plug part a. a cylinder 31; and an outer cylinder 31 formed of a metal material.
It consists of a socket fitting 32 fitted and assembled on the rear end side, and a holder 33 formed into a coil shape from a metal wire and fitted into the inner cavity of the socket fitting 32.

Reference numeral C denotes a connection terminal that is inserted into the inner cavity of the insulating outer cylinder 30 and assembled, and is made by punching out a springy metal plate into a shape having terminal pieces 40 and 41 that serve as spring terminals at both front and rear ends. However, the terminal piece 40 provided on the front end side thereof is as shown in FIG.
Two contact pieces 40, one protruding long and the other short
The terminal piece 41 provided on the rear end side is formed into a fork shape with the contact pieces a and 40b facing left and right as shown in FIG. 7. , as shown in FIG. 8, two contact pieces 41a, 4 facing the pair in FIG.
One contact piece 41b of 1b is formed in a cut-out shape.

As shown in FIG. 1, this connecting terminal C is connected to the rear end of the outer sleeve 12, where the long side contact piece 40a of the fork-shaped terminal piece 40 on the front end side becomes the second pole of the plug part a. The tip pin 1 is pressed against the part 12a, and the short side contact piece 40b becomes the inner pole of the plug part a.
The terminal piece 41 provided on the rear end side is inserted into the insulating outer cylinder 30 in a state in which it is in pressure contact with the rear end portion of the insulating outer cylinder 30, and is assembled and held in the insulating outer cylinder 30 in that state. The spring lug is designed to come into pressure contact with the tip 50 at the tip of the two-pole plug B inserted as shown by the chain line.

Note that the above-described connection terminal C may be assembled to the insulating outer cylinder 30 as appropriate. Figures 9 to 1
Figure 2 shows an example of the assembly means. In this method, the insulating outer cylinder 30 is divided into two by a dividing plane along its axial direction (front-back direction),
A half-split insulating outer cylinder 30a as shown in FIGS. 9, 10, and 11 is molded, and a fitting groove 301 into which one of the left and right sides of the connecting terminal C fits is formed on the inner peripheral surface of the outer cylinder 30a. As shown in FIG. 12, an engaging protrusion 302 is formed in a certain shape, and one of the left and right sides of the connecting terminal C is placed in the engaging groove 301 as shown by the chain line in FIG. 12. The fitting recess 42 formed on the side edge of the connection terminal C as shown in FIG.
Then, in this state, another half-split insulating outer cylinder 30a is joined so as to cover it from above, and the cylindrical insulating outer cylinder 30 is assembled, and the connecting terminal C is assembled and held. In a restrained state,
Furthermore, by fitting it into the outer cylinder 31 in that state,
By assembling the insulating outer cylinder 30 assembled together with the outer cylinder 31 to the connecting fitting 2 of the plug part a, the connecting terminal C is held in the inner cavity of the insulating outer cylinder 30, and long and short contacts are made on the front end side. Pieces 40a and 40b are plug part a
The rear end 12a of the outer sleeve 12 is the second pole of the
and the rear end of the tip pin 11 serving as the inner pole.

Next, to explain the function and effect, the adapter plug A according to the present invention configured as described above.
2 is from the socket fitting 32 on the rear end side of the jack part b.
When plug B is inserted, tip 5 at the tip of it
0, the plug part a is connected to the plug part a by the contact pieces 40a and 40b.
The rear terminal piece 41 of the connecting terminal C connected to the rear end 12a of the outer cylinder sleeve 12 of the second pole and the rear end of the tip pin 11 serving as the inner pole acts as a spring lug and comes into pressure contact with the two poles. On the circumferential surface of the outer sleeve 51, which becomes the outer pole of the plug B, the outer sleeve 13, which becomes the outer pole of the plug part a, the connecting fitting 2, and the outer sleeve 31.
At the same time, a holder 33 made of a metal wire connected via the socket fitting 32 is brought into pressure contact, and the conversion from three poles to two poles is performed.

Then, in order to connect the second pole outer sleeve 12 and the inner pole tip pin 11 of the plug part a to the chip 50 of the two-pole plug B to be inserted, the inside of the insulating outer sleeve 30 of the jack part b is inserted. The aforementioned contact piece 40a, contact piece 40b, and terminal piece 41 to be assembled to the insulating outer cylinder 30 are easy to manufacture because they can be formed continuously from a single metal plate, and their assembly to the insulating outer cylinder 30 is also easy. It becomes easier.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional side view of an adapter plug that can carry out the present invention, Fig. 2 is a side view of the plug main body of the same plug, Fig. 3 is a rear view of the same plug main body, and Fig. 4 is a longitudinal cross-section of the same plug main body. 5 is a side view of the holder, FIG. 6 is a rear view of the same holder, FIG. 7 is a perspective view of the connection terminal, and FIG. 8 is a perspective view of the connection terminal of another embodiment. Figure 9 is a plan view of the half-split insulating outer cylinder, Figure 10 is a front view of the same half-split insulating outer cylinder, and Figure 1 is a front view of the half-split insulating outer cylinder.
FIG. 1 is a rear view of the above half-split insulating outer cylinder, and FIG. 12 is a longitudinal sectional side view of the same half-split insulating outer cylinder. Explanation of drawing symbols A...adapter plug, B...
2-pole plug, a...plug part, b...jack part,
C...Connection terminal, 1...Plug part main body, 10...Tip, 11...Tip pin, 12a...Rear end part, 12,
DESCRIPTION OF SYMBOLS 13... Outer cylinder sleeve, 14... Synthetic resin material, 2... Connection fitting, 30... Insulating outer cylinder, 30a... Half insulating outer cylinder, 301... Fitting groove, 302... Engaging protrusion, 31...
Outer cylinder, 32... Socket fitting, 33... Holder, 40, 4
1...Terminal piece, 40a, 40b, 41a, 41b...
Contact piece, 42... Fitting recess, 50... Chip, 51...
Outer sleeve.

Claims (1)

[Claims] 1 Equipped with a 3-pole plug part on the tip side and 2 on the rear end side.
In an adapter plug equipped with a terminal jack part, a connection terminal, which is a springy metal plate punched out and provided with terminal pieces at both front and rear ends, is placed inside the insulating outer cylinder of the jack part. The terminal piece is inserted into a fork shape with two contact pieces, one long and the other short, facing each other on the left and right, and the long side contact piece is pressed into contact with the rear end of the second pole of the plug part. The short contact piece is assembled and held in the insulating outer cylinder with the short contact piece in pressure contact with the rear end of the inner pole of the plug part, and the terminal piece on the rear end side of the connection terminal is attached to the rear end of the two-pole plug inserted into the jack part. An adapter plug characterized by a spring lug that presses against the tip at the tip.