Electrical connectors – With insulation other than conductor sheath – Plural-contact coupling part
Reexamination Certificate
2000-09-07
2002-08-27
Sircus, Brian (Department: 2839)
Electrical connectors
With insulation other than conductor sheath
Plural-contact coupling part
C439S668000
Reexamination Certificate
active
06439933
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the improvement on a single-head plug or a multi-polar coaxial plug being of a type, in which the first pole acting as an internal pole is mounted to the end of an axial rod-like body formed by a metal material, and metal rings of the second to nth poles acting as external poles are mounted around the body in axially parallel arrangement.
2. Description of the Prior Art
The multi-polar coaxial plug of the above type, more specifically, a triple-polar coaxial plug is assembled as follows. As shown in
FIGS. 1 and 2
, for instance, a rearward-extending center pin
10
formed by a metal material is mounted to the axial center of the rear end of a head
1
formed by a metal material acting as the first pole. An outer sleeve
2
formed by a metal material acting as the second pole is fitted to the circumference of the center pin
10
in coaxial arrangement. A metal ring
3
setting up the third pole is inserted between the outer sleeve
2
and the head
1
. An intermediate sleeve
4
formed by a metal material and smaller in diameter than the outer sleeve
2
is inserted between the inner surface of the outer sleeve
2
and the outer surface of the center pin
10
in coaxial arrangement relative to the center pin
10
. The front end of the intermediate sleeve is united or connected integrally with the above metal ring
3
setting up the third pole, and a connection screw s separately molded with a resin material for screwing a knob is mounted to the rear end of the above outer sleeve
2
setting up the second pole. Then, the above members are set in a mold while being kept in predetermined positions. Subsequently, a resin material p serving as an insulating material is injected into the mold to allow the insulation of the internal pole acting as the first pole from the metal ring
3
setting up the third pole and the earth pole and also to mold the above members as one united body with the resin material p, providing the triple-polar coaxial plug as shown in FIG.
1
. Then, connection lug pieces
1
a
,
2
a
,
3
a
are mounted to the triple-polar coaxial plug for connection to a cord, as shown by a chain line in FIG.
2
. In use, the cord is connected to these connection lug pieces
1
a
,
2
a
,
3
a
by soldering.
In the case of providing more poles for the multi-polar coaxial plug of the above type, that is, making an attempt to assemble a quadruple-polar coaxial plug by providing one more pole for the above triple-polar coaxial plug, another intermediate sleeve is required, in addition to the intermediate sleeve
4
inserted between the center pin
10
and the outer sleeve
2
. In this case, there is the need for insertion of another intermediate sleeve between the above intermediate sleeve
4
and the center pin
10
or between the above intermediate sleeve
4
and the outer sleeve
2
for uniting or connecting integrally the front ends of these intermediate sleeves with the metal ring
3
acting as the third pole and one more metal ring required for setting up the fourth pole. Thus, since two intermediate sleeves are placed in the shape of a double shaft between the outer surface of the center pin
10
and the outer sleeve
2
, the flow path for the resin material p when injected is limited to degrade the flow of the injected resin material p, resulting in a problem of making it hard to perform molding with the resin material.
In view of the above circumstances, the applicants of the present invention have developed a means of assembling a multi-polar coaxial plug as shown in
FIG. 5
by the steps of forming connection terminal pieces
4
a
,
4
b
of such a shape as the intermediate sleeve
4
united or connected integrally with the metal ring
3
setting up the third pole in the above triple-polar coaxial plug is divided into a plurality of parts in a circumferential direction, placing these connection terminal pieces
4
a
,
4
b
around the center pin
10
in coaxial arrangement as shown in
FIG. 4
to unite or connect integrally the metal ring
3
setting up the third pole, a metal ring
5
setting up the fourth pole and a metal ring (not shown) setting up the nth pole (not shown) with the ends of the connection terminal pieces and also to connect the rear ends of the connection terminal pieces
4
a
,
4
b
of the divided intermediate sleeve shape with a core line of a cord by soldering, then mounting these connection terminal pieces
4
a
,
4
b
. . . between the outer surface of the center pin
10
and the inner surface of the outer sleeve
2
in ring-shaped arrangement at predetermined intervals in the circumferential direction as seen from the longitudinal direction, then setting these members in a mold while keeping these members in this state, and injecting the resin material p into the mold to assemble the multi-polar coaxial plug. This means has been applied as Japanese Patent application No. 11-151392.
When more poles are provided for the multi-polar coaxial plug by means of adapting the intermediate sleeve, which is smaller in diameter than the outer sleeve fitted to the circumference of the center pin extending from the rear end of the head, for the connection terminal piece connected to the metal ring mounted between the front face of the outer sleeve and the head in the manner of inserting the intermediate sleeve between the outer surface of the center pin and the inner surface of the outer sleeve in coaxial arrangement relative to the metal ring mounted between the rear face of the head and the front face of the outer sleeve, the following problem is caused. That is, since the plug is limited as to the outer diameter, and the center pin is also limited as to the outer diameter, the intermediate sleeve mounted in multiple arrangement between the outer sleeve and the center pin narrows the flow path for the resin material in excess to thereby make the molding with the resin material difficult.
On the other hand, when more poles are provided by means of mounting the connection terminal pieces, which are connected to the metal rings required for providing more poles, around the center pin in ring-shaped arrangement as seen from the longitudinal direction in the manner of forming these connection terminal pieces to have such a shape as the intermediate sleeve is divided into a plurality of parts in the circumferential direction, only the substantially single intermediate sleeve mounted between the center pin and the outer sleeve makes it possible to increase the poles up to desired number such as four, five and six poles, and as a result, molding by pressure injection of the resin material may be carried out without difficulties. However, the above means involves such a problem as the connection terminal pieces of such the circumferentially divided intermediate sleeve shape are hard to be set in the mold while being kept at their predetermined positions.
SUMMARY OF THE INVENTION
The present invention is provided for dissolving the above problems with the conventional means, and its object is to provide a novel method for facilitating molding by pressure injection of a resin material by, while providing more poles by means of mounting connection terminal pieces connected to metal rings acting as incremental poles in ring-shaped arrangement as seen from the longitudinal direction in the manner of forming these connection terminal pieces to have such a shape as an intermediate sleeve is divided into a plurality of parts in the circumferential direction, allowing a plurality of connection terminal pieces of such the circumferentially divided intermediate sleeve shape to be set in a mold in such a state that the connection terminal pieces are temporarily fixed as being held at predetermined positions together with a center pin and an outer sleeve or the like.
According to the present invention, as a means of attaining the above object, there is provided a method of molding a multi-polar coaxial plug in an assembled state. That is, in a multi-polar coaxial plug molded with a resin material a
Browdy and Neimark
Nguyen Son V.
Sircus Brian
LandOfFree
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