JPH11307163A - Attachment plug with card and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment plug with a cord having a compact finishing at a low cost with a double-stage integrating molding and capable of giving a suspension part function as needed. SOLUTION: This plug 1 is formed of plural blades 2 including an earth pole, a conductor part 5 to be fitted to a blade caulking part 2a, a coated wire part 4 formed by coating the conductor 5, a sheath wire part 3 for sheathing the coated wire part 4, an insulated core part 6 provided with a built-in part from a rear part 2b of the blade 2 to a tip 3a of the sheath wire 3 and formed by the primary molding, and an outer case insulator 7 formed on the sheath wire 3 by the secondary molding so as to be integrated with the insulated core 6. Since the assembling work of this plug is automated for production through all processes, compact and beautiful finishing can be obtained for practical use, and dead weight of the plug to be applied to the socket can be reduced by giving a suspension part function to the outer case insulator capable of being manufactured at a high manufacturing speed at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corded plug used as a device wiring device having a rated voltage of 125 V or more (including 125 V) and a rated current of 7 A or less (including 7 A) and a method of manufacturing the same.

Conventionally, in this type of insertion plug, after a blade is soldered to a conductor of a covered wire exposed from a sheath wire, the covered wire portion with the blade is inserted into a separately prepared grooved two-piece insulating core. Since the insulation core is screwed from the top and bottom and the outer insulation is covered over it, it is a completely manual assembly type, so it is not possible to expect a compact finish, and there is a problem that production speed does not increase and costs increase. there were.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art.
The problem of obtaining a plug with a cord for a device wiring device having a rated voltage of 125 V or more and a rated current of 7 A or less, which has an inexpensive and compact finish by a two-stage molding process, and which can be provided with a hanging portion function if necessary. Is to solve.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to solve the above-mentioned problems, and as a result, the conductors of a plurality of, for example, four covered wires exposed from the sheath wire, for example, four conductors including a ground wire. Each of the blades is caulked and attached to the rear end of the blade with a press machine.Then, from the rear part of the blade to the front end of the sheath wire is placed in a mold having a certain size and shape, and a resin having a heat deformation temperature of 180 ° C. or higher is used. Perform primary molding to form an insulating core containing the part, then put the insulating core and the subsequent sheath wire portion into another mold, and apply a thermoplastic resin having a lower heat deformation temperature than the resin or elastomer. A secondary molding is performed using a thermoplastic elastomer to form an outer shell insulator integral with the insulating core on the insulating core and the subsequent sheath wire, and a plug is formed. By using a means that, found that in the conventional obtained did not inexpensive can be obtained coded attachment plug with hanging portion optionally having a compact finish, to complete the present invention.

That is, the present invention is a corded plug having the following features: (i) a multi-blade blade including a ground electrode; (ii) a conductor attached to these blades; iii) a covered wire portion covering the conductor portion; (iv) a sheath wire portion obtained by sheathing the covered wire portion; and (v) a support from the rear portion of the blade to the distal end portion of the sheath wire. (Vi) an outer shell insulator formed by secondary molding on the insulating core and the subsequent sheath wire so as to be integral with the insulating core;

In addition, according to the present invention, the conductors of a plurality of covered wires protruding from the leading end of the sheath wire are attached to the rear ends of the same number of blades as the covered wires including the ground wire, and then the leading end of the sheath wire from the rear of the blade. The part is placed in a mold having a certain size and shape, and the heat deformation temperature is 18
Perform primary molding using a thermosetting resin, thermoplastic resin, or thermoplastic elastomer at 0 ° C or higher to form an insulating core that incorporates from the back of the blade to the tip of the sheath wire. The subsequent sheath wire portion is placed in another mold and subjected to secondary molding using a thermoplastic resin or a thermoplastic elastomer having a lower thermal deformation temperature than the resin or the elastomer. A method for manufacturing a plug with a cord, characterized in that a shell insulator is formed on an insulating core and a subsequent sheath wire.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. 1 is a partially cutaway side view of a corded plug of the present invention, FIG. 2 is a perspective side view of the corded plug of the present invention, and FIG. 3 is a top view of a plug portion of the corded plug of the present invention. 4 is a top view of the cross section of FIG. 2A-A, FIG. 5 is a side view of a state in which the insulating core covers a part of the blade, conductor, covered wire, and sheath, and FIG. FIG. 7 is a partially transparent side view showing a state where a part of the sheath is covered.
It is a top view of the insulating core part in the state which covered the conductor, the covering wire, and a part of sheath. Here, 1 is a plug with a cord of the present invention, 2 is a blade, 2a is a blade caulking portion, 2b is a blade rear portion, 3 is a sheath wire portion, 3
a is a sheath wire tip, 4 is a covered wire, 5 is a conductor, 6 is an insulating core, 7 is an outer shell insulator, and 8 is a suspending portion provided on the outer shell insulator.

That is, the above-mentioned plug with cord 1
As shown in FIG. 6, a part of the sheath 3 at the distal end portion 3a of the sheath wire 3 is peeled to expose the sheath wire 4, and further, the conductor portion 5 inside the sheath wire portion 4 at the exposed portion is exposed to remove the sheath wire. It is mounted on the caulking portion 2a of the blade 2 and caulked with a press machine to form the covered wire 4 with the blade 2.

Next, a sheath wire 3 is inserted from the rear portion 2b of the blade 2.
a into a mold having a certain size and shape,
Molding is performed using a thermosetting resin, a thermoplastic resin, or a thermoplastic elastomer that can be molded at 180 ° C. or higher, and the leading end 3 of the sheath wire 3 is inserted from the rear portion 2 b of the blade 2.
An insulating core 6 as shown in FIG.

Next, the insulating core 6 and the subsequent sheath wire portion 3a are put into another mold and molded again using a thermoplastic resin or a thermoplastic elastomer which can be molded at a lower temperature than the resin or the elastomer. Is performed to form an outer shell insulator 7 which is apparently integrated with the insulating core 6 on the insulating core 6 and the sheath wire 3 subsequent thereto. According to this method, a plurality of, for example, four blades 2 including an earth pole E as shown in FIG. 1, FIG. 2 or FIG. 3, FIG. 4, a conductor 5 attached to these blades, and a coating of the conductor 5 Covered wire portion 4, a sheath wire portion 3 sheathing the covered wire portion 4, and a primary mold which supports the blade and incorporates a portion from the rear portion 2 b of the blade 2 to the distal end portion 3 a of the sheath wire 3. A plug 1 composed of an insulating core 6 formed by molding, and an outer shell insulator 4 formed by secondary molding on the insulating core 6 and the subsequent sheath wire 3 so as to be integrated with the insulating core 6 is attached. Obtainable.

In forming the outer shell insulator 7, if necessary, a suspending portion 8 as shown in FIG. 1 is provided at a desired portion of the outer shell insulator to provide a hanging portion function to the outer shell insulating portion. However, this hanging portion 8 is used to reduce the weight of the plug applied to the outlet, and when the plug 1 is pulled out from the outlet when wired at a high place, the cord hangs down due to the weight of the plug 1. When the hanging portion 8 is hung on a nail or the like, the weight of the plug is not applied to the outlet, and even when the plug is pulled out from the outlet, the cord does not hang due to the weight of the plug. Safety can be ensured, and handling is convenient.

Next, the members constituting the present invention will be described. For the conductor portion 5 used in the present invention, a conductor used for a general electric wire is used. The material of the blade 2 including the ground electrode E is not particularly limited as long as the material is used for a normal plug such as nickel-plated brass.

Further, the covering material of the covered wire portion 4 formed by covering the conductor portion 5 is mainly composed of rubber, thermoplastic elastomer or thermoplastic resin, and has an insulating property with a volume resistivity of 10 ¹³ Ωcm or more. is there. Since a plurality of covering wire portions 4 of the sheath wire 3 usually have different color tones, the covering material of the covering wire portion 4 must be selected so that it can be changed to any color tone.

As a sheath material of the sheath wire 3 formed by sheathing a plurality of covered wire portions 4, rubber, thermoplastic elastomer or thermoplastic resin having a certain flexibility is used.

Next, as shown in FIG. 1, FIG. 2, FIG. 5, and FIG.
For example, the insulating core 6 is made of a thermoplastic elastomer such as polyamide, vinyl chloride or polyester, phenol resin, diallyl phthalate resin, xylene resin, urethane resin, nylon resin, fiber or Thermosetting resin such as filler-reinforced thermosetting resin, nylon 66 resin, fluororesin, fiber or filler reinforced nylon resin, fiber or filler reinforced polyester resin, fiber or filler reinforced polycarbonate resin, fiber or filler reinforced polyolefin It is preferably formed of a resin, fiber or a thermoplastic resin such as a filler-reinforced polyvinyl chloride resin, and more preferably has a heat deformation temperature of 180 ° C. or more under a load of 4.64 kg / cm ² . The reason for using these resins is to prevent thermal deformation of the insulating core 6 when the outer shell 7 is integrally formed on the insulating core 6 by performing molding again later.

Further, the outer shell insulator 7 is made of a styrene-based, olefin-based, urethane-based, vinyl chloride-based, or polyester-based thermoelectric material having a heat deformation temperature lower than that of the elastomer or resin forming the insulating core 6. It is preferably formed of a thermoplastic elastomer or a thermoplastic resin such as a polyethylene resin, a polypropylene resin, a polyvinyl chloride resin, an ethylene vinyl acetate resin, a polystyrene resin, an acrylonitrile / styrene resin, and an acrylonitrile / butadiene / styrene resin.

[0017]

The present invention will be specifically illustrated by the following examples, but the present invention is not limited to these examples. Molded under the conditions of Table 2 using the components having the materials of Table 1,
A corded plug of the present invention was manufactured. When the performance of the plug was examined, the performance shown in Table 3 was obtained.

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

[Table 3]

As can be seen from Table 3, the corded plug of the present invention had sufficient performance as a product.

[0022]

The corded plug of the present invention has a very high practicality of compact and beautiful finish because all the assembly processes can be mechanized and produced.
By adding a hanging part function to the outer shell insulator, which is fast and inexpensive to produce, the weight of the plug on the outlet can be reduced, and even if the plug is pulled out from the outlet at a high wiring position etc. It has many advantages, such as increased safety, such as no sag.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of a corded plug of the present invention.

FIG. 2 is a perspective side view of a plug with a cord according to the present invention.

FIG. 3 is a top view of a plug portion of the plug with a cord according to the present invention.

FIG. 4 is a top view of an AA cut surface.

FIG. 5 is a side view showing a state in which a part of a blade, a conductor, a covered wire, and a sheath are covered with an insulating core;

FIG. 6 is a partially transparent side view of a state in which a part of a blade, a conductor, a covered wire, and a sheath are covered with an insulating core.

FIG. 7 is a top view of the insulating core portion in a state where the blade, conductor, covered wire, and part of the sheath are covered with the insulating core;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insert plug with cord of this invention 2 Blade (blade) 2a Blade caulking part 2b Blade rear part 3 Sheath wire part 3a Sheath wire tip part 4 Covering wire part 5 Conductor part 6 Insulating core 7 Outer shell insulator 8 Outer shell insulator Hanging part provided

Claims (4)

[Claims] 1. Corded plug having the following features: (i) a multi-blade blade including a ground electrode; (ii) a conductor attached to these blades; (iii) a conductor. (Iv) a sheath wire portion obtained by sheathing the covered wire portion; (v) a primary mold molding supporting the blade and incorporating a portion from the rear portion of the blade to the tip of the sheath wire. And (vi) a shell insulator formed by secondary molding on the insulating core and the subsequent sheath wire so as to be integral with the insulating core. 2. The insulating core is an insulator formed of a thermoplastic elastomer, a thermoplastic resin or a thermosetting resin having a heat deformation temperature of 180 ° C. or more, and the outer shell insulator is made of an elastomer or a resin forming the insulating core. The plug with a cord according to claim 1, wherein the plug is a insulator formed of a thermoplastic elastomer or a thermoplastic resin having a low heat distortion temperature. 3. The plug with a cord according to claim 1, wherein a hanging portion function is provided to the outer shell insulator. 4. The conductors of a plurality of covered wires protruding from the distal end of the sheath wire are respectively attached to the rear ends of the same number of blades as the covered wires including the ground wire, and then from the rear of the blade to the distal end of the sheath wire. It is placed in a mold having a certain size and shape, and is subjected to primary molding using a thermosetting resin, a thermoplastic resin or a thermoplastic elastomer having a heat deformation temperature of 180 ° C. or more, and a front end of a sheath wire from a rear portion of the blade. Forming an insulating core incorporating up to the portion, then put the insulating core and the subsequent sheath wire portion into another mold, and apply a thermoplastic resin or a thermoplastic elastomer having a lower heat deformation temperature than the resin or the elastomer. By performing secondary molding using, the outer shell insulator integral with the insulating core is formed on the insulating core and the subsequent sheath wire. To make a plug with a cord.