JPS6042473Y2 - Device to prevent plugs from coming off in jacks of light electrical equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a device for preventing unplugging of a plug in a jack of a light electrical device.

A jack formed as the jack part of an adapter plug or a shack that is assembled into a light electrical device such as a radio, is used to ensure a good electrical connection of the plug inserted into the jack, and when the plug is inserted into the jack. In order to firmly maintain the inserted state even if force is applied in the pulling direction due to pulling on the connected cord, etc., there is a means to provide a device to prevent the plug from being pulled out to hold the inserted plug. Although it has been known for a long time, the conventional pull-out stop device is
During use, the holding power of the plug gradually weakens, reducing its durability, and furthermore, it is troublesome to manufacture and assemble.

The purpose of the present invention is to propose a new means to solve these problems.

Next, the means of the present invention for achieving this object will be explained in detail with reference to the drawings with reference to embodiments.

In Figure 1, a is a jack formed as a jack part of adapter plug A formed into three poles, and a socket metal fitting formed of a metal material is attached to the rear end side (right end side in the figure). 1.

Reference numeral 2 denotes an outer sleeve made of a metal material which serves as the outer pole of the jack a, and its front end is connected to the outer sleeve 2a of the plug part, and the socket fitting 1 is fitted on its rear end.

3 is an insulating material formed into a sleeve shape from a synthetic resin material and fitted inside the outer cylinder sleeve 2; 4 is a spring plate disposed in the inner cavity of the insulating material 3 and assembled to the jack a; The front end side is connected to the intermediate sleeve 4a which becomes the second pole of the plug part.

Reference numeral 5 denotes a connecting terminal piece made of a spring plate arranged in the inner cavity of the cylindrical insulating material 3 and assembled to the jack a so as to form a pair with the connecting terminal piece 4, and the front end side has a plug portion. Tip 5 at the front end
Connected to a.

In FIG. 2, W is a cylindrical coil spring accommodating portion provided immediately inside the plug insertion hole 10 formed in the socket fitting 1, and is located at the rear end of the aforementioned outer cylinder sleeve 2 of the socket fitting 1. By enlarging the diameter of the plug insertion hole 10 at the inner end into which the plug is inserted, it is formed integrally and continuously with the socket fitting 1.

The inner diameter of the coil spring accommodating portion W is
A step 1 formed between the plug insertion hole 10 and the plug insertion hole 10 is
It is set to be larger than the diameter of a metal wire forming a coil spring 6, which will be described later.

This coil spring accommodating portion W is, as shown in FIG.
A space is formed between the inner end surface 1a of the socket fitting 1 that fits into the open opening at the rear end of the outer cylinder sleeve 2 and the rear end surface 30 of the cylindrical insulating material 3, and the structure is formed by this space. There are cases where

In this case, the circumferential wall of the coil spring accommodating portion W becomes the inner circumferential surface of the outer cylinder sleeve 2.

The above-mentioned coil spring 6 fitted into the above-mentioned coil spring accommodating part W
is formed by winding a springy metal wire such as a steel wire into a coil shape, the inner diameter of which is larger than the plug insertion opening 10, and the outer diameter corresponds to the inner diameter of the coil spring housing portion W. It is formed.

The coil spring 6 has a small diameter that is slightly smaller than the outer diameter of the outer cylindrical sleeve 2b of the plug B inserted into the plug insertion opening 10 as shown by the chain line in FIG. The small-diameter portion 6a is provided with an axial center line of the inner cavity of the small-diameter portion 6a, which is aligned with the axial center line of the plug insertion opening 10 of the socket fitting 1, as shown in FIG. The coil springs 6 are formed so that they substantially match each other.

In the embodiment shown in FIG. 2, one small-diameter portion 6a formed in a part of the coil spring 6 is provided in the middle of the coil spring 6 in the axial direction (continuous direction of the metal wire). However, as shown in FIG. 3, a plurality of them may be provided.

Further, as shown in FIG. 4, the coil spring 6 may be provided at both ends (or one end in some cases) in the axial direction.

Further, even when a plurality of small diameter portions 6a are provided so as to be located at the intermediate portion of the coil spring 6 in the above direction, there may be a case where a plurality of small diameter portions 6a are provided so as to be sandwiched between large diameter portions 6b.

Next, Figure 7 shows the jack a installed in audio equipment such as a radio.
Examples are shown below.

In the figure, 7 is an outer casing made of insulating material, and a socket metal fitting 1
is assembled to this outer casing 7, and has a threaded portion 13 on the outer periphery for assembling the jack a to the plate wall 8 of the device with screws 80.

The socket fitting 1 has a coil spring formed immediately inside the plug insertion opening 10 of the socket fitting 1 by expanding the diameter of the inner end of the plug insertion opening 10, similar to the socket fitting 1 shown in FIG. A accommodating portion W is provided, and a coil spring 6 made of a springy metal wire is fitted into the coil spring accommodating portion W.

The inner end surface 1a of the socket fitting 1 abuts against the rear end surface 30 of the insulating material 3 integrally formed with the outer casing 7.

Reference numeral 9 denotes a connecting terminal to be connected to the socket fitting 1, and 4 and 5 are connection terminal pieces made of spring plates that come into contact with the intermediate sleeve 4b and the tip 5b of the plug B inserted into the socket fitting 1.

Next, to explain the function and effect, the device for preventing the plug from being removed from the jack according to the present invention, which is constructed as described above, prevents the plug from being removed when the plug B is inserted into the plug insertion opening 10 of the socket fitting 1 of the jack. Plug B outer sleeve 2
b is inserted into the inner cavity of the coil spring 6 that is fitted into the coil spring accommodating portion W provided inside the plug insertion hole 10 of the socket fitting 1. The small diameter portion 6a is forcibly inserted into the inner cavity of the small diameter portion 6a, and the small diameter portion 6a is forcibly expanded while drawing the metal wire from the large diameter portion 6b that is continuous with the small diameter portion 6a.

Therefore, when the plug B is inserted into the plug insertion hole 10 which is the socket of the socket fitting 1, the outer circumferential surface of its outer sleeve 2b is pressed against the inner circumferential surface of the small diameter portion 6a of the coil spring 6. As a result, the coil spring 6 is tightly bound by the small diameter portion 6a of the coil spring 6, and is firmly held so that even a small amount of force in the pulling direction will not escape.

In addition, since the outer circumferential surface of the coil spring 6 that holds the plug B is in a state where it is pressed against the inner circumferential surface of the socket fitting 1 or the outer sleeve 2, the inserted plug B The connection state of the outer cylinder sleeve 2b, which is the outer pole of the connector, to the jack is ensured.

Thus, the small diameter portion 6a of the coil spring 6, which acts to hold the inserted plug B and to reliably maintain its connected state, is a part of the coil spring 6 by means of the metal wire forming the coil spring 6. Since the outer cylindrical sleeve 2b of the plug B inserted into the socket fitting 1 is formed slightly in relation to the diameter of the plug insertion hole 10 provided in the socket fitting 1, the receiving When the plug B moves in the axial direction and in the direction orthogonal to the direction, the coil spring is tightly wound around the outer circumferential surface of the outer sleeve 2b of the plug B together with the outer sleeve 2b. Since the metal wire swings against the main body of the jack A due to the springiness of the metal wire, even if the inserted plug B moves as if being pried against the jack A, the function of holding the plug B will not be impaired. If you pull out the inserted plug B again,
The elasticity of the metal wire instantly restores its original state, so it can be used almost semi-permanently, and it is easy to manufacture because it only requires winding a springy metal wire into a coil.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of an adapter plug that can implement the present invention, Fig. 2 is a longitudinal sectional side view of the main parts of the same, Fig. 3 is a longitudinal sectional side view of the main parts of another embodiment, The figure is a longitudinal sectional front view of the main part of a different embodiment, FIG. 5 is a longitudinal sectional rear view of the main part of the same, FIG. FIG. 3 is a partially broken vertical side view. Explanation of drawing symbols, A...Adapter plug, B
...Plug, a...Jack, b...
...Plug part, 1...Socket fitting, 1a...
...End face, 10...Plug insertion port, 13.
...screw part, W...coil spring housing part,
1...Step, 2...Outer cylinder sleeve, 2
a...Outer sleeve, 2b...Outer sleeve, 3...Insulating material, 30...Rear end surface, 4...Connection Terminal piece, 4a...Intermediate sleeve, 5...Connection terminal piece, 5a...
・Chip, 6... Coil spring, 6a...
・Small diameter part, 6b...Large diameter part, 7...Outer casing, bottom...Plate wall, 80...Screw, 9...
····Connecting terminal.

Claims (1)

[Scope of utility model registration request] A cylindrical coil spring accommodating portion W having an inner diameter larger than that of the plug insertion hole 10 is provided immediately inside the plug insertion hole 10 provided in the socket fitting 1 of the jack, and a spring-like coil spring accommodating portion W is provided inside the coil spring accommodating portion W A certain metal wire has an inner diameter larger than the plug insertion opening 10 and an outer diameter of the coil spring accommodating portion W.
A spirally wound coil spring 6 corresponding to the inner diameter of the plug insertion opening 1 is fitted onto a part of the coil spring 6.
A small diameter portion 6a having a slightly smaller diameter than the outer diameter of the outer sleeve 2b of the plug B to be inserted into the plug B is provided so that the axis of the inner cavity of the small diameter portion 6a is approximately aligned with the axis of the plug insertion opening 10. A device that prevents the plug from being unplugged from a jack for light electrical equipment.