JPH10247563A - plug - Google Patents

Abstract

(57) [Summary] [PROBLEMS] A plug for not disconnecting a speaker when taking output from an earphone jack of a television or the like,
Obtain good contact and no damage. SOLUTION: A contact conductor 16 on the plug side is a metal of a conical shape. One end of the spring shaft 15 made of a wire is fixed, and a contact conductor 16 is fixed to the tip through the center of the sleeve 12. The jack 1 has an electrical contact comprising a fixed contact piece 2 and a spring contact piece 3 in a speaker circuit. When the plug is inserted into the jack, the contact conductor 16 comes into contact with the spring contact piece 3, but the contact pressure is not large enough to move the spring contact piece 3, so that the earphone can be heard without disconnecting the speaker.
Since the contact conductor 16 is a cut-cone-shaped metal, the contact with the spring contact piece 3 is good, and the plug is not dropped or damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plug,
More specifically, the present invention relates to a plug which is inserted into an earphone jack provided in a television, a radio, or the like, so that the sound of the speaker can be heard without interrupting the sound of the speaker.

[0002]

2. Description of the Related Art For example, when a member of a family has a hearing-impaired person, the hearing-impaired person and the family may want to watch one television together. In such a case, even if the plug of the earphone for the hearing impaired is inserted into the jack of the television, it is necessary that the speaker circuit is not interrupted. As a device that meets such a demand, there is a device disclosed in Japanese Utility Model Publication No. 2-47577. As shown in FIG. 4, a jack 1 provided on a television has an electric contact composed of a fixed contact piece 2 and a spring contact piece 3, and this electric contact is interposed in a speaker circuit. A ground terminal 5 extends from the plug insertion portion 4. The plug is provided with a coil spring 9 at an end of a sleeve 7 projecting from the cap 6 via an insulator 8.
The elastic member 10 in the sleeve 7 prevents the plug from falling off. According to the above configuration, the coil spring 9 as the contact conductor comes into contact with the spring contact piece 3 to listen to the sound from the earphone, but the pressure of the coil spring 9 is reduced by the spring contact piece 3 and the fixed contact piece 2.
Is set to such an extent that the electrical contact is not opened, so that a simultaneous output can be obtained from the speaker and the earphone.

[0003]

In the conventional plug as described above, since the contact conductor is a coil spring, the contact with the spring contact piece is poor. If the plug is turned to improve the contact, the coil spring is damaged. There were inconveniences such as getting lost. An object of the present invention is to solve such a problem, and an object of the present invention is to obtain a plug in which a contact conductor and a spring contact piece are in good contact and a breakage accident is minimized.

[0004]

According to a plug according to the present invention, a contact conductor having a truncated cone shape is fixed to the tip of a thin spring shaft having one end fixed, and the contact conductor is elastically deformed, that is, bent by the spring shaft. To the spring contact piece.

[0005] In another invention of the present invention, in addition to the above, the output side is a secondary jack having a second spring contact piece, and can be used as an adapter.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) In FIG. 1, a metal bearing 14 is mounted on a base of a metal sleeve 12 projecting from a cap 11 via an insulator 13. One end of a spring shaft 15 made of a metal wire such as phosphor bronze is fixed to the bearing 14. The spring shaft 15 has a free end protruding from the sleeve 12 through the center of the sleeve 12 and has a substantially conical contact conductor 1.
6 is attached. The spring shaft 15 is bendable around the fixed end in the sleeve 12 and a vinyl tube 17 is attached to the spring shaft 15 to prevent a short circuit between the spring shaft 15 and the sleeve 12. An insulating washer 20 is interposed between a ground terminal 18 connected to the sleeve 12 and a hot terminal 19 connected to the spring shaft 15.

A case where the plug having the above configuration is inserted and connected to a jack provided on a television or the like will be described with reference to FIG. In the figure, the jack 1 is the same as that of FIG. Now, when the sleeve 12 is inserted into the plug insertion portion 4, the contact conductor 16 comes into contact with the ridge of the spring contact piece 3 and comes into contact with the spring contact piece 3 by being drawn in a conical surface. At this time, the spring shaft 15
Is curved with the fixed end as a fulcrum, and presses the contact conductor 16 against the spring contact piece 3 with its elastic restoring force. This pressing force is set not large enough to open the spring contact piece 3 and the fixed contact piece 2. Therefore, it is possible to listen to the sound with the earphone without disconnecting the speaker. Since the contact conductor 16 has a cut cone shape, the contact with the spring contact piece 3 is good, and the plug does not fall off. Although the plug is not turned, even if the plug is turned around, neither the plug nor the jack is damaged.

(Embodiment 2) FIG. 3 shows a second embodiment in which the output side of the plug is a secondary jack. Here, the same reference numerals as those in FIG. 1 denote the same parts. In FIG. 3, a second spring contact piece 19a is provided as a hot terminal of the plug. A cover 21 made of a metal cylinder is connected to the ground side.
The plug insertion part 22 is provided at the rear end. In this way, the output side of the plug becomes the secondary jack 23. From the above,
In addition to being able to listen to the earphones together with the speaker by inserting the conventional contact conductor immovable plug to which the earphone is connected into the plug of FIG. 3 inserted into the jack of the television, remove the plug of FIG. 3 from the television. You can listen to only the earphones by inserting the old plug directly into the jack of the TV. Thus, the plug having the function of the jack can be used as the adapter, which is convenient.

[0009]

According to the present invention, as is apparent from the above description, a contact conductor having a truncated cone shape is mounted on the free end of the spring shaft.
Since the contact conductor is resiliently contacted with the spring contact piece of the jack by the elastic deformation of the spring shaft, the contact can be made good and there is no accident, so that the speaker and the earphone can be heard simultaneously. In another invention, the output side is a secondary jack and can be used as an adapter, so that it is very convenient for simultaneous listening of the speaker and the earphone and listening of only the earphone.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing Embodiment 1 of the present invention.

FIG. 2 is a longitudinal sectional view for explaining the operation of the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing Embodiment 2 of the present invention.

FIG. 4 is a longitudinal sectional view showing a conventional plug.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Jack 15 Spring shaft 2 Fixed contact 16 Contact conductor 3 Spring contact 19a Second spring contact 12 Sleeve 23 Secondary jack

Claims (2)

[Claims] 1. A plug which is inserted into a jack having an electric contact composed of a fixed contact and a spring contact to take out a signal from the spring contact without opening the electric contact, wherein a free end of a spring shaft fixed at one end is provided. A plug comprising a contact conductor having a truncated conical shape at an end thereof, wherein the contact conductor elastically contacts the spring contact piece by elastic deformation of the spring shaft. 2. A plug, which is inserted into a jack having an electric contact consisting of a fixed contact and a spring contact to take out a signal from the spring contact without opening the electric contact, the free end of a spring shaft having one end fixed. A cut-cone-shaped contact conductor is provided at an end, and the contact conductor comes into elastic contact with the spring contact piece by elastic deformation of the spring shaft, and the output side is a secondary jack having a second spring contact piece. A plug characterized in that: