JPH0126063Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a jack used for a pin plug having three contact conductor parts.

Such a connection mechanism using a pin plug and a jack that can be engaged and separated is used in many electrical devices, and in particular, many types of jacks are known. In these jacks, a strip-shaped contact piece having a contact part that makes elastic pressure contact with each contact conductor part of the pin plug is inserted and fixed inside an outer case made of an insulating material and has a pin plug insertion hole. However, as the size of the jack becomes smaller, the internal space of the outer casing also becomes smaller, and it is quite difficult to arrange the contact pieces therein without shorting each other. In particular, stereo pin plugs require three contact pieces, and it is becoming increasingly difficult to arrange them inside the outer casing without shorting them. In such a case, if the size of the jack is to be reduced, the size of the contact piece must be reduced, which is disadvantageous in that poor contact is likely to occur and durability is also degraded.
Therefore, jacks that work with conventional stereo pin plugs tend to be larger. Furthermore, arranging the three contact pieces within the outer casing requires unreasonable arrangement, which inevitably results in troublesome assembly and high cost.

[Purpose of the invention] The purpose of the invention is to solve the above-mentioned drawbacks of the conventional jack, and even when three contact pieces are used, only the contact piece on the grounding side is connected so that they do not short-circuit to each other. The object of the present invention is to provide a jack that can be placed on the outer surface of the outer casing so that it can be held securely, and that can be easily made compact despite using a large contact piece, and that is easy to assemble. The gist is that the pin plug has two contact parts that press the contact conductor part of the pin plug along the first and second guide grooves provided on the inner surfaces of the left and right side walls of the outer casing made of an insulating material and has an insertion hole for the pin plug. A contact portion is formed in which the first and second strip-shaped contact pieces are inserted and fixed, and the contact conductor portion of the pin plug is pressed into contact with the contact conductor portion of the pin plug along a third guide groove provided on the outer surface of the central portion of the upper wall of the outer casing. At the same time, the contact portion at the tip of the third contact piece protrudes into the interior through an opening provided in the outer casing, and the third contact piece has a protrusion. It has a locking part on both sides thereof, and when inserted into the third guide groove, the locking part engages with two locking grooves provided in the outer casing. It is.

The present invention will be explained in detail below based on illustrated embodiments.

In FIG. 1, for example, a pin plug 1 is for a stereo, and its rod-shaped conductor is an insulating ring 2a,
It has three first, second, and third contact conductors 3a, 3b, and 3c electrically separated by a line 2b. Here, the first and second contact conductors 3a and 3b are signal conductors for the left and right channels, and the third contact conductor 3c is a ground conductor common to both channels.

The jack 10 of the present invention, which cooperates with such a pin plug 1, has a box-shaped outer casing 11 made of an insulating material made of synthetic resin, and one end surface of the jack 11 is made of an insulating material made of synthetic resin.
A cylinder 12 having an insertion hole 13 into which the contact conductors 3a to 3c are inserted is integrally formed. Note that a metal ring is fitted into the inner surface of the insertion hole 13 to increase mechanical strength. Inside the outer casing 11, strip-shaped first and second contact pieces 1 are provided along the inner surfaces of the left and right walls, respectively.
4 and 15 are fixed, and a strip-shaped third contact piece 16 is fixed along the outer surface of the central portion of the upper wall of the outer casing 11. These first, second and third contact pieces 1
4, 15, and 16 are in contact with the contact conductors 3a, 3b, and 3c of the pin plug 1, respectively.

FIG. 2 is an exploded perspective view of the jack 10. As described above, the outer casing 11 is formed with the cylinder 12 that constitutes the plug insertion hole 13.
The contact pieces 14, 15, 16 are inserted from the opposite side. The first and second contact pieces 14 and 15, which respectively contact the contact conductors 3a and 3b of the pin plug 1, have almost the same shape, but because they are connected to the contact conductors 3a and 3b at different lengthwise positions, the contacts are different. Piece 15 is slightly longer. These first and second contact pieces 14 and 15 have contact portions 14a and 15 that are curved inward and have elasticity, respectively.
a and a protruding piece 14b, 1 for connecting the lead wire.
5b and protrusions 14c and 15c for fixing the contact pieces 14 and 15 to the outer casing 11, respectively, are integrally formed. Further, the third contact piece 16 that comes into contact with the grounding contact conductor 3c of the pin plug 1 includes a contact portion 16a curved in a semicircular shape to have elasticity, and a protruding piece 16b for connecting a lead wire. Two protrusions 16c, 16 for fixing the contact piece 16 to the outer casing 11
d is integrally formed. These projections 14
c, 15c, 16c, and 16d are bent in advance to one side as shown in the figure, so that they can be locked by the spring action.

When assembling, first the first contact piece 14 is inserted into the guide groove 18 formed on the inner surface of one side wall of the outer casing 11.
a, 18b, and the free end of the protrusion 14c protrudes into the window 19 formed in the side wall of the outer casing 11 and is locked therein. The second contact piece 15 is similarly pushed into the guide grooves 20a and 20b formed on the inner surface of the other side wall of the outer casing 11, and the protrusion 15c is projected into the window 21 shown in FIG. 1 and locked therein. Finally, the third contact piece 16 is formed in the guide grooves 22a, 22 formed on the outer surface of the upper wall of the outer casing 11.
b and push it into the outer casing 1.
1 into the opening 23 to the internal space formed in 1. At the same time, the protrusions 16c and 16d formed on the third contact piece 16 are fitted into the locking grooves 24a and 24b formed on the outer casing 11, respectively, and the third contact piece 16 is fitted into the locking grooves 24a and 24b, respectively.
6 is locked to the outer casing 11. These contact pieces 14,1
5, 16, when assembling the protrusions 14c, 15c,
16c and 16d are pressed flat by the inner and outer surfaces of the outer casing 11, respectively, when inserted, but the window 1
9, 21, when reaching the locking grooves 24a, 24b, the spring action causes the protrusions 14c, 15c,
16c and 16d will be raised and locked. In this way, the contact pieces 14 and 15 are attached to the outer casing 1.
The third grounding contact piece 1 can be placed at a predetermined position along the inner surface of the left and right side walls of 1.
6 can be arranged at a predetermined position along the outer surface of the upper wall of the outer casing 11, and the protrusions 14c, 15c,
Windows 19 and 2 formed in the outer casing 11 by 16c and 16d
1 and the edges of the locking grooves 24a, 24b, there is no risk that the contact pieces 14, 15, 16 will be displaced or come out of the outer casing 11.

As explained above, in the jack according to the present invention, the two contact pieces are arranged along the guide grooves on the left and right side walls of the outer casing, and in particular, one contact piece for grounding is placed in the center of the upper wall of the outer casing. Since the contact pieces are arranged along the guide groove of the part, there is no possibility that these contact pieces will short-circuit or undesirably come close to each other. In addition, good electrical characteristics can be obtained, the entire structure can be made compact, assembly is extremely simple, and the cost is low. In particular, the third contact piece, which is placed on the outside of the outer casing and is susceptible to external forces, has locking parts on both sides of the third contact piece and engages with two locking grooves provided on the outer casing. It can be held securely without rattling and is stable against external forces.

[Brief explanation of the drawing]

The drawings show an embodiment of the jack according to the present invention, and FIG. 1 is a perspective view of a pin plug and a jack for the pin plug, and FIG. 2 is an exploded perspective view of the jack. 1 is a pin plug, 10 is a jack, 11 is an outer casing, 12 is a cylinder, 13 is an insertion hole, 14, 15,
16 are the first, second and third contact pieces, 14
a, 15a, 16a are contact parts, 14b, 15b,
16b is a protruding piece, 14c, 15c, 16c, 16d
are protrusions, 18a, 18b, 20a, 20b, 22
a and 22b are guide grooves, 19 and 21 are windows, 23 is an opening, and 24a and 24b are locking grooves.

Claims (1)

[Scope of utility model registration request] Two strips having contact portions that press the contact conductor portions of the pin plugs along first and second guide grooves provided on the inner surfaces of the left and right side walls of an outer casing made of an insulating material and having insertion holes for the pin plugs. A strip having a contact portion into which first and second contact pieces of the shape are inserted and fixed, and which press-contacts the contact conductor portion of the pin plug along a third guide groove provided on the outer surface of the central portion of the upper wall of the outer casing. inserting a third contact piece having a shape, and protruding the contact portion at the tip of the third contact piece into the interior through an opening provided in the outer casing;
The third contact piece has locking portions made of protrusions on both sides thereof, and when inserted into the third guide groove, the locking portions are engaged with two locking grooves provided in the outer casing. A jacket that is characterized by its ability to match.