JP2000021493A - electrical plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power source plug capable of improving the power source cord holding rigidity. SOLUTION: This power source plug 1 is formed of a plug base 4, having an insertion pin 2 and a conductive terminal 3, a plug cover 5 welded to the plug base 4 while covering the conductive terminal 3, and a plug armor 7 for a power source cord 6 connected to the plug base 4 and the plug cover 5. The plug armor 7 is provided with a flange part 12, a first binder part 13 and a second binder part 14 formed in order from a tip to a root of the plug armor 7, and the plug cover 5 is provided with a first holder 16 formed downward in a fork form and to be engaged with the first binder part 13, and the plug base 4 is provided with a second holder 20 formed upward like a fork, to be engaged with the second binder part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power plug attached to an outlet, and more particularly to a power plug in which a plug cover is prevented from peeling.

[0002]

2. Description of the Related Art As a three-pole power plug having a ground pin, a power plug shown in FIGS. 6 and 7 is known. As shown in the figure, a power plug a has a plug base d having an insertion pin b and a conductive terminal c, and a plug cover e welded to the plug base d so as to cover the conductive terminal c.
And a plug armor g of the power cord f connected to the plug base d and the plug cover e.

[0003] bayonet b is made of a live pin b ₁ and the neutral pin b ₂ and the earth pin b ₃ Metropolitan. Power cord f is live lines f ₁ and neutral line f ₂ and the ground line f
₃ and has a, the live line f ₁ is connected to the bracket i, the neutral line f ₂ is connected to a terminal j ₂ of the neutral pin b _2, connecting ground wire f ₃ is the end j ₃ of the earth pin b ₃ Is done. Fitting h is connected to the terminal j ₁ of the live pin b _1, fitting h, the i, fuse k is mounted. The fuse k is covered with a lid member l. A portion or a part exposed or protruding from the plug base d, such as the metal fittings h and i and the terminals j ₁ , j ₂ and j ₃ , is called a conductive terminal c.

The plug armor g of the power cord f is mounted on a plug base d after a flange m formed at the end thereof is mounted in an engagement slot n formed in the plug base d.
The plug cover e is welded by ultrasonic waves or the like and attached.

[0005]

In the power plug a, the plug arm g of the power cord f is used.
Is held only in the engagement slot n of the plug base d, so that there is room for improvement for increasing the holding rigidity of the power cord f.

That is, in the power plug a,
When the user pulls the power cord f in the V direction in FIG. 6 to remove the power plug a from the outlet, the pulling force of the power cord f acts on the above-mentioned engaging slot n, and the pulling force is applied. There is a possibility that the plug cover e, which has been welded to the plug cover e, is peeled off from the plug base d, and the conductive terminal c is exposed. Therefore, the power cord f
It is necessary to increase the holding rigidity.

In the power plug a, a finger grip o to be gripped when the power plug is attached to or detached from an outlet is formed on a side surface of the plug cover e. For this reason,
A tensile force acts on a welded portion p between the plug base d provided with the insertion pin b and the plug cover e provided with the finger grip o each time the plug cover e is attached and detached. There is a possibility that the conductive terminal c is peeled off from the base d and the conductive terminal c is exposed.

The direction of the force when pulling the power cord F to remove the power plug a from the outlet is not the H direction but the V direction in FIG. The power plug a is L
Because it is a mold plug, it cannot be pulled in the H direction.

An object of the present invention, which has been made in view of the above circumstances, is to provide a power plug which can prevent the plug cover from peeling off.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plug base having an insertion pin and a conductive terminal, and a plug cover welded to the plug base so as to cover the charged component. And a plug armor of a power cord connected to the plug base and the plug cover, wherein the plug armor has a flange portion, a first constricted portion, and a second portion formed sequentially from the distal end to the base. A constricted portion, a first holder formed in a downward fork shape on the plug cover and engaged with the first constricted portion, and a first holder formed in an upward forked shape on the plug base and holding the second constricted portion. And two holders.

According to the present invention, the plug armor of the power cord has the first constricted portion held by the first holder of the plug cover, and the second constricted portion held by the second holder of the plug base. Therefore, the tensile force applied to the power cord in the direction V (parallel to the insertion pin) in FIG.
It acts on the plug base via the holder and no longer acts directly on the plug cover. Therefore, peeling of the plug cover can be prevented. The pulling force applied to the power cord in the direction H (in the direction perpendicular to the insertion pin) in FIG. 1 does not directly act as a peeling force of the plug cover, but the flange portion and the first
Join the holder. Therefore, the power cord is sufficiently held. That is, the tensile force in the H direction corresponds to the flange portion and the first holder, and the tensile force in the V direction corresponds to the second holder and the second constricted portion.

The first constricted portion is made thinner and the second constricted portion is made thicker. The fork width of the first holder is made smaller and the fork width of the second holder is made larger in accordance with the first and second constricted portions. The second holder may be provided with a throttle member for reducing the fork width in accordance with the constricted width of the first constricted portion at the tip of the second holder. According to this configuration, when attaching the plug armor to the plug base and the plug cover, first, the first constricted portion of the plug armor is inserted between the throttle members of the second holder of the plug base, and the first holder is inserted into the second holder. The neck portion is temporarily engaged, and then the plug armor is pushed forward in the axial direction to engage the second neck portion with the second holder. Thereafter, the first holder of the plug cover is engaged with the first constricted portion of the plug armor, and the plug cover is attached to the plug base.

[0013] The plug base may be formed of a box having an opening at the upper portion of which the plug cover is mounted, and a finger grip may be formed on a side surface of the box. According to this configuration, since the finger grip is provided on the plug base having the insertion pin, the attaching / detaching force applied to the finger grip when attaching / detaching the power plug to / from the outlet is directly inserted without passing through the plug cover. Acts on pins. Therefore, the attaching / detaching force does not act so as to peel off the plug cover.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a power plug 1 according to the present embodiment has an insertion pin 2 on a lower surface and a conductive terminal 3 on an upper surface.
, A plug cover 5 welded to the upper surface of the plug base 4 so as to cover the conductive terminals 3, and a plug armor 7 of a power cord 6 connected to the plug base 4 and the plug cover 5. are doing. The material of the plug base 4 and the plug cover 5 is polyamide (nylon).

Four engaging claws 8 are provided on the upper surface of the plug base 4 at predetermined intervals in the circumferential direction, and an engaging groove 9 is provided on the inner surface of the plug cover 5 in accordance with them. With the engagement claws 8 engaged with the engagement grooves 9, the plug base 4 and the plug cover 5 are welded by ultrasonic waves or the like. The insertion pin 2 has a three-pin structure as shown in FIG. A finger grip 11 is recessed in the side surface portion 10 of the plug cover 5.

As shown in FIG. 2, the plug armor 7 is formed with a flange portion 12, a first constricted portion 13, a second constricted portion 14, and a holder portion 15 sequentially from the distal end to the base side. ing. The first constricted portion 13 is formed thinner than the second constricted portion 14. The first constricted portion 13 and the second constricted portion 14 are each formed in a rectangular cross section. The rectangular cross sections of the first constricted portion 13 and the second constricted portion 14 have long sides 13a and 14a and short sides 13a, respectively.
b and 14b.

The plug cover 5 is provided with a first holder 16 which engages with the first constricted portion 13 and is formed in a downward fork shape. Fork width 17 of first holder 16
Is formed in accordance with the long side portion 13 a of the first constricted portion 13. The fork thickness 18 of the first holder 16 is formed in accordance with the axial length of the first constricted portion 13 (see FIG. 2D). The inner side surface 19 of the first holder 16 is formed in a planar shape so that the flange portion 12 is in close contact.

The plug base 4 is provided with a second holder 20 that engages with the second constricted portion 14 and is formed in an upward fork shape. Fork width 21 of second holder 20
Is formed in accordance with the long side portion 14a of the second constricted portion 14. The fork thickness 22 of the second holder 20 is formed to match the length of the second constricted portion 14 and the length of the first constricted portion 13 formed to have substantially the same length. The outer surface 23 of the second holder 20 is formed in a planar shape so that the holder portion 15 is in close contact.

As shown in FIG. 2C, an aperture member 24 is provided at the tip of the second holder 20. The aperture member 24 is formed so as to reduce the fork width in accordance with the narrow width of the short side portion 13 b of the first narrow portion 13, and is formed flush with the inner surface 25 and the outer surface 23 of the second holder 20. . The distance between the flange portion 12 and the holder portion 15 (that is, the first
The total length of the constricted portion 13 and the second constricted portion 14) is set slightly larger than the total thickness of the thickness 18 of the first holder 16 and the thickness 22 of the second holder 20.

FIG. 3A shows an outline of the conventional plug armor g shown in FIGS. 6 and 7, and FIG. 3B shows an outline of the plug armor 7 of the present embodiment shown in FIGS. Show. As shown, the plug armor 7 of the present embodiment
Is a flange portion 12, a first constricted portion 13, and a second constricted portion 14.
The conventional plug armor g has only a flange portion m to be fitted in an engagement slot n formed in a plug base d, while having a flange portion m.

When assembling the power plug 1 according to the present embodiment, first, the core wire 26 of the power cord 6 protruding from the distal end side of the plug armor 7 is connected to the conductive terminal 3 of the plug base 4. Next, as shown in FIG. 2A, the first constricted portion 13 of the plug armor 7 is inserted between the narrowing members 24 of the second holder 20 of the plug base 4 and the short side portion 13a.
2 and the first constricted portion 13 is temporarily engaged with the second holder 20 as shown in FIG. 2 (b).

Next, the plug armor 7 is rotated 90 degrees around its axis as indicated by an arrow 27, and is pushed forward in the axial direction as indicated by an arrow 28, thereby forming a second constricted portion 14 as shown in FIG.
Is engaged with the second holder 20. Thereby, the second constricted portion 14 fits exactly into the second holder 20, and the holder portion 15 comes into close contact with the outer surface 23 of the second holder 20.

Next, as shown by an arrow 29 in FIGS. 1 and 2 (d), the plug cover 5 is
The first holder 16 is engaged with the first constricted portion 13 while engaging the engagement grooves 9 and attaching them. This allows
The flange 12 is in close contact with the inner surface 19 of the first holder 16. Then, the plug base 4 and the plug cover 5 are welded by ultrasonic waves or the like.

The core wires 26 of the power cord 6 are
As described above, prior to the process of FIG.
It is not always necessary to connect to the conductive terminal 3 of FIG.
Alternatively, it may be connected to the conductive terminal 3 of the plug base 4 after the step of FIG. In short, it is only necessary that the conductive terminals 3 of the plug base 4 be connected before being covered with the plug cover 5 in the step of FIG.

The operation of this embodiment will be described.

According to the power plug 1 as described above, the plug armor 7 of the power cord 6 has the first constricted portion 13 held by the first holder 16 of the plug cover 5 and the second constricted portion 14 connected to the plug base 4. Is held by the second holder 20.

Thus, when the power cord 6 is pulled, the tensile force applied to the power cord in the V direction in FIG. 1 (the direction parallel to the insertion pin 2 and the direction perpendicular to the welding surface of the plug cover 5) is as follows.
It acts on the plug base 4 via the second constricted portion 14 and the second holder 20 and no longer acts directly on the plug cover 5. Therefore, peeling of the plug cover 5 can be prevented.

The tensile force applied to the power cord 6 in the direction H in FIG. 1 (in the direction perpendicular to the insertion pin 2 and in the direction parallel to the welding surface of the plug cover 5) is directly parallel to the welding surface of the plug cover 5 because it is parallel. In general, it does not act as a peeling force of the plug cover 5, but the second force is applied via the flange portion 12 and the first holder 16.
It is received by the holder 20 and held by the plug base 4. Therefore, peeling of the plug cover 5 can be prevented.

That is, in the case of the conventional power plug a shown in FIG. 6, when the power cord f is pulled, almost 100% of the pulling force in the V direction is applied to the plug cover e. On the other hand, in the case of the power plug 1 of the present embodiment shown in FIG. 1, approximately 100% of the tensile force in the V direction is applied to the plug base 4, so that the plug cover 5 can be prevented from peeling. is there.

FIG. 5 shows another embodiment. As shown in the figure, the power plug 1a according to this embodiment has the same basic configuration as the power plug 1 of the embodiment shown in FIGS. 1 and 2 described above, and has a plug base 4 on top and a plug cover 5 on top. A box body 31 having an opening 30 to be mounted;
The only difference is that a finger grip 33 is formed on the side surface 32 of the box 31. Therefore, the same components as those in the previous embodiment are denoted by the same reference numerals, and description thereof will be omitted, and only different points will be described.

More specifically, the plug base 4 is connected to the second
A box body 3 having a side surface portion 32 integrally formed with the holder 20, and an upper end of the side surface portion 32 forming an opening 30.
Consists of one. The plug cover 5 attached to the opening 30 of the box 31 has the same first holder 16 as that of FIG. (See FIG. 2 (c)). The plug cover 5 is provided with an engagement claw 35, and the plug base 4 is provided with an engagement groove 36.

The plug armor 7 of the power plug 1a
Is attached to the plug base 4 and the plug cover 5 as shown in FIGS. 2 (a) to 2 (d) described above, and the plug base 4 and the plug cover 5 are welded and fixed by ultrasonic waves or the like. . FIG. 4A shows a plug cover 5 in which a finger grip 11 is formed as in the previous embodiment shown in FIG. 1, and FIG. 4B shows a box-shaped plug base 4 as in this embodiment. The figure which formed the finger grip 11 in the side part 32 is shown.

According to the power plug 1a according to the embodiment shown in FIG. 5, since the finger grip 33 is provided on the plug base 4 having the insertion pin 2, the finger plug 33 is used when the power plug 1a is attached to and detached from the outlet. The attaching / detaching force applied to the grip 11 directly acts on the insertion pin 2 without going through the plug cover 5. Therefore, the detachment / removal force does not act to peel off the plug cover 5, and the peeling of the plug cover 5 is further suppressed.

[0035]

As described above, according to the power plug of the present invention, peeling of the plug cover from the plug base can be suppressed.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a power plug according to an embodiment of the present invention.

FIGS. 2A and 2B are process diagrams showing a state in which a plug armor of the power plug is attached to a plug base and a plug cover. FIG. 2A is a first process diagram, FIG.
FIG. 2C is a third process diagram, and FIG. 2D is a fourth process diagram.

FIG. 3 is a side view showing a plug armor of the power plug and a plug armor of a conventional power plug. FIG. 3 (a) is a side view of a conventional plug armor.
FIG. 3B is a side view of the plug armor of the present embodiment.

FIG. 4 is an explanatory view showing a finger grip of a power plug. FIG. 4 (a) is a side view of a plug cover having a finger grip, and FIG. 4 (b) is a side view of a plug base having a finger grip. FIG.

FIG. 5 is a partially exploded perspective view of a power plug having a finger grip provided on a plug base.

FIG. 6 is a front side perspective view in which a conventional power plug is partially exploded.

FIG. 7 is a rear perspective view in which a conventional power plug is partially disassembled.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power plug 2 Insertion pin 3 Conductive terminal 4 Plug base 5 Plug cover 6 Power cord 7 Plug armor 11 Finger grip 12 Flange part 13 First constricted part 14 Second constricted part 16 First holder 20 Second holder 24 Aperture member 31 Box

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshinori Goto, Inventor 4-1-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Cable Processing Co., Ltd. (72) Masami Nemoto 4-1-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture No. Hitachi Cable Processing Co., Ltd. (72) Inventor Zensuke Araki 4-1-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture Inside Hitachi Cable Processing Co., Ltd. (72) Satoshi Sakuma 4-1-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture No. Hitachi Cable Processing Co., Ltd. (72) Inventor Minoru Sato 4-10-1, Kawajiri-cho, Hitachi City, Ibaraki Prefecture F-term (reference) 5C021 FA03 FA14 FB21 FC08 GA05 GB08 5E087 EE02 EE04 EE07 FF02 FF13 GG02 HH01 JJ05 MM05 MM09 MM12 QQ03 RR06

Claims (3)

[Claims] 1. A plug base having an insertion pin and a conductive terminal, a plug cover welded to the plug base so as to cover the conductive terminal, and a plug armor of a power cord connected to the plug base and the plug cover. A power supply plug comprising: a flange portion, a first constriction portion, and a second constriction portion sequentially formed on the plug armor from a distal end side to a root side; A power plug comprising: a first holder engaged with one constricted portion; and a second holder formed in a fork shape upward on the plug base and holding the second constricted portion. 2. The fork width of the first holder is narrowed in accordance with the first and second constrictions, and the fork width of the second holder is reduced in accordance with the first and second constrictions. 2. The power plug according to claim 1, wherein the width of the fork is widened, and a throttle member for reducing the fork width in accordance with the constricted width of the first constricted portion is provided at the tip of the second holder. 3. The power plug according to claim 1, wherein said plug base is formed of a box having an opening at an upper portion thereof for mounting a plug cover, and a finger grip is formed on a side surface of the box.