JP2002008762A - Connector for power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inlet structure (power supply connector) having high holding strength to a resin mold housing a plug pin, and superior reliability and durability to the insertion load and the draw-out force of a plug corde which is an mating connector. SOLUTION: This connector uses the resin mold obtained by injection molding a thermoplastic resin, as a housing of an inlet having an opening part for inserting the plug cord which is the mating connector, an plug pin insertion hole is formed on the bottom of the housing corresponding to the outer diameter of a main body of the plug pin, one or plural projecting parts are formed on an outer periphery of the plug pin, and the plug pin is fitted into the insertion hole while applying the ultrasonic wave vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply connector for obtaining a commercial power supply in various electronic / electric devices such as a video deck, a word processor, an AC-DC conversion power supply, and more particularly to an inlet structure having a high holding strength for plug pins. .

[0002]

2. Description of the Related Art Various electronic apparatuses are provided with a power supply connector called an inlet into which a power plug cord is inserted in order to obtain a commercial power supply. Conventionally, the structure of this type of power supply connector (inlet) is, for example, as shown in FIG. 4, formed of a resin mold obtained by injection molding or the like, and has an insertion hole 103 in the bottom of a housing 101 having an opening 102 for inserting a plug cord. It is widely known that a plug pin 110 provided with a lance 112 on the outer periphery is inserted into this, and the lance is locked by a lance locking portion 104 provided in the housing. In this case, when inserting the plug cord, which is the mating connector, against the insertion load with only the lance, the pulling load when pulling out the plug cord is such that the terminal piece 114 provided at the rear end of the plug pin is located at the bottom of the housing. They will come into contact and compete. However, since the plug cord for using the commercial power supply for the electronic device having the inlet is procured through domestic and overseas routes according to the circumstances of each store, etc., it has a very strong power to insert it into the inlet. Some of them require the improvement of the holding strength of the plug pin. In addition, even if the plug cord is slightly inclined at the time of insertion, the insertion load becomes high, but since the plug pin is locked only by the lance, if a large load is applied, the lance may be broken and the plug pin may fall out of the housing. .

[0003]

SUMMARY OF THE INVENTION The present invention relates to an inlet structure (power supply) which has a high holding strength of a plug pin in a resin mold housing, and has excellent reliability and durability against insertion load and pull-out force of a plug cord as a mating connector. Connection connector).

[0004]

Means taken by the present invention to solve the above-mentioned problem are injection molding of a thermoplastic resin as a housing having an opening through which a plug cord as a mating connector is inserted. Using the resin mold obtained above, a plug pin insertion hole is provided at the bottom of this housing corresponding to the outer diameter of the main body of the plug pin, and one or more protrusions are provided on the outer periphery of the plug pin to apply ultrasonic vibration. While being pressed into the insertion hole. When ultrasonic vibration is applied to the plug pin at the time of press-fitting, a portion in contact with the protrusion on the outer peripheral portion of the plug pin and heat generated by vibration friction between the thermoplastic resin mold is softened and melted, wraps around the protrusion, and is cooled and hardened there. Therefore, when the insertion of the plug pin is completed, the projection is embedded in the resin mold, so that the plug pin can be locked at this portion without play or shake. A projection is provided on the outer periphery of the plug pin as an inlet structure. Insertion while applying ultrasonic vibration and the projection is buried in the resin mold alone can secure the retention strength of the plug pin, but is compatible with the conventional lance retention method. By applying such an inlet, an inlet having more excellent reliability and durability can be obtained.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 and FIG. 2 are cross-sectional views of an embodiment of an inlet structure which is a power supply connector according to the present invention. The housing 1 is formed of a thermoplastic resin mold, and has an opening 2 for inserting a plug cord (not shown), which is a mating connector, and a plug pin insertion hole 3 at the bottom of the housing. The plug pin 10 is shown in FIG. 3 as an example obtained by press-forming a conductive metal plate.
A lance 12 and one or more protrusions 13 are provided on an outer peripheral portion of the device 1 and a terminal piece 1 connected to an internal circuit of an electronic device is provided on a rear end portion.
4 are provided. As shown in FIG. 1, when the plug pin is inserted while applying ultrasonic vibration to the insertion hole of the housing using the ultrasonic vibration oscillator 20, the lance has elasticity and moves while slidingly contacting the insertion hole wall 6. The part is larger than the inner diameter of the insertion hole of the housing and abuts against the wall of the insertion hole. Heat is generated by the vibration friction of the ultrasonic vibration on this contact surface, and this part of the thermoplastic resin mold softens and melts and protrudes according to the movement of the plug pin. It turns around the part and cools and hardens there.
FIG. 2 shows a state in which the plug pin has been completely inserted in this manner, and a cross-sectional state of the protrusion at this time is a state in which the protrusion is embedded in the resin mold as shown in FIG. Further, the lance engages with a lance locking portion provided in the housing by its elasticity.

Accordingly, the shape of the protruding portion is not particularly limited, for example, a semi-circular shape as long as frictional heat is easily generated by ultrasonic vibration at the time of insertion and the melted resin goes around backward. In order to increase the holding force, a pyramid or semi-conical shape having a tapered portion in the plug pin traveling direction is desirable. Also, the method of forming the plug pin is shown in FIG.
The metal plate shown in (1) is not limited to the one formed by press-molding, but is not limited as long as the metal plug pin is provided with a projection, and the projection may be integrated or separately attached later.

[0007]

According to the inlet structure of the present invention, the plug pin is locked in the housing with the projection of the plug pin embedded in the resin mold of the housing, so that there is little play or misalignment between the plug pin and the housing. Thus, the power supply connector has a high plug pin holding strength.

[Brief description of the drawings]

FIG. 1 shows a state in which a plug pin is inserted in an inlet structure according to an embodiment of the present invention.

FIG. 2 shows a cross-sectional view of the inlet structure according to the present invention.

FIG. 3 shows an example of a plug pin according to the present invention;
They are a front view, (b) plan view, (c) bottom view, and (d) side view.

FIG. 4 shows a conventional inlet structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Opening part 3 Insertion hole 4 Lance locking part 5 Housing bottom part 6 Insertion hole wall 10 Plug pin 11 Plug pin main body 12 Lance 13 Projection part 14 Terminal piece 20 Ultrasonic oscillator

Claims (2)

[Claims] 1. An outer peripheral portion of a plug pin, which is in contact with a wall of an insertion hole in a power supply connector formed by inserting a plug pin from an insertion hole formed in a bottom portion of a resin housing having an opening for connecting a mating connector. A power supply connector obtained by providing at least one or more protrusions on the plug pin and inserting the plug pin into the insertion hole while applying ultrasonic vibration to the plug pin. 2. A plug pin having a lance on an outer peripheral portion is inserted into an insertion hole formed in a bottom of a resin housing having an opening for connecting a mating connector, and the lance is engaged with a lance locking portion of the housing. In the power supply connector for locking the plug pin, at least one or more protrusions are provided on the outer peripheral portion of the plug pin at a portion abutting on the insertion hole wall, and the plug pin is inserted into the insertion hole while applying ultrasonic vibration to the plug pin. A power supply connector characterized by being obtained by: