JP3518383B2 - Tabletop - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table tap.

[0002]

2. Description of the Related Art A table tap of this type is composed of a tap portion provided with a blade insertion opening into which a blade of a plug is inserted and an insertion plug connected to the tap portion via an external electric wire. There was something. The tap section consists of an inner case made of a material with excellent heat resistance and tracking resistance, and an outer shell made of a relatively soft material with excellent impact resistance that wraps the inner case. At the place, the portion of the inner case where the blade insertion opening was provided was exposed (see JP-A-3-222272).

[0003]

In the table tap having the above-mentioned structure, a pair of conductive plates having blade receiving springs are disposed inside the inner case at a portion corresponding to the plug blade insertion opening. The core of the external electric wire is connected to the conductive plate by caulking. In the conductive plate, the caulking portion to which the core wire of the external electric wire is connected by caulking and the blade receiving spring are continuously and integrally formed, and the blade receiving spring is required to have elasticity. Therefore, the conductive plate is made of an elastic material ( For example brass).
Therefore, the caulking part is also formed from an elastic material, and the caulking part and the external electric wire loosen due to secular change, the contact resistance increases, and the caulking part and the external electric wire are connected. Was a factor that increased heat generation.

The present invention has been made in view of the above problems, and an object thereof is to provide a table tap in which the contact resistance between the caulking portion and the external electric wire is reduced.

[0005]

In order to achieve the above object, according to the invention of claim 1, a tap portion having a blade insertion opening into which a blade of a plug is inserted is formed, and a plug portion is installed inside the tap portion. A plurality of blade receiving springs that make electrical contact with the blade inserted into the tap portion through the blade insertion opening, and a caulking portion to which one end of the external electric wire drawn into the tap portion is caulked and coupled. Of the electric wire and an insertion plug connected to the other end of the external electric wire, each electric conductor being formed by coupling a blade receiving spring portion having a blade receiving spring and an electric wire connecting portion having a caulking portion. The blade receiving spring portion is formed of brass, the wire connection portion is formed of a copper-based alloy having high conductivity and low elasticity, and the tap portion is an inner case in which the conductor is installed, and Uchike the outer periphery of the inner case substantially to cover the entire circumference Secondary molding a scan periphery on an insulating resin
Is composed of an outer shell formed by each conductor is however
It is installed in the inner case with the female part protruding from the inner case, and it is inside the part where each conductor protrudes on the surface of the inner case, and the part where each conductor protrudes and each conductor
A first groove for accumulating water droplets that has penetrated into the inner case is formed in a portion of the inner case between the inner space to be housed and a portion of the inner case surface where each of the conductors protrudes. The insulating resin that forms the outer shell at
A second groove to be filled is provided. Since the conductor is thus configured by connecting the blade receiving spring portion and the wire connecting portion, different materials can be used for the blade receiving spring portion and the wire connecting portion, and the blade receiving spring portion is made of brass. Since the wire connection part is made of a copper-based alloy with high conductivity and low elasticity, the blade receiving spring part that requires elasticity is made of brass with high elasticity, so that the blade and the blade It is possible to make sure contact with the receiving spring,
Moreover, by forming the wire connection part that does not require elasticity from a copper-based material with high conductivity and low elasticity, the caulking state of the external wire does not loosen easily over time, and the contact resistance between the wire connection part and the external wire It is possible to prevent an increase in heat generation and increase in heat generation. Furthermore, since the wire connection part is made of a material with high conductivity, the contact resistance between the wire connection part and an external wire can be reduced, and the contact at the time of manufacturing can be reduced. It is possible to prevent an increase in heat generation due to variations in resistance, so that it becomes easy to control contact resistance during manufacturing and the yield is improved.

Further, since the first groove for accumulating water droplets that have penetrated into the inner case is formed in the inner surface of the inner case, the first groove for accumulating water drops is formed in the inner case. It is possible to prevent the conductors of different polarities from being short-circuited by the water droplets that have accumulated in the first groove and do not accumulate between the conductors of different electrodes.

In addition, the insulating resin can be filled in the second groove formed in the portion between the protruding portions of the conductors, and the insulating resin filled in the second groove can be filled. Thus, the conductors can be insulated from each other, the creepage distance between the conductors can be increased, and the tracking resistance can be improved.

According to a second aspect of the invention, in the first aspect of the invention, the tap portion and the insertion plug are provided with a polarity display portion for displaying the polarity of the blade insertion opening and the blade, respectively. The invention according to claim 3 is characterized in that each of the polarity display portions comprises a groove formed in a portion of the tap portion and the surface of the insertion plug in the vicinity of the ground electrode side. The polarity of the blade provided on the blade insertion port or the plug provided can be easily determined.

According to a fourth aspect of the present invention, in the first aspect of the present invention, a plurality of cylinders for covering the peripheral surface of the external electric wire are provided at the portion where the external electric wire is pulled out from the tap portion and the insertion plug body, and the outer peripheral surface of the external electric wire. A bellows portion that is formed along the surface and has ribs that connect the cylinders to each other is integrally formed with the tap portion and the insertion plug body, and the width of the groove so that the adjacent cylinder bodies contact each other when the bellows portion bends. The bellows portion is formed by connecting a plurality of tubular bodies that cover the peripheral surface of the external electric wire through ribs, and the groove and the tubular body The width of the bellows is such that adjacent cylinders come into contact with each other when the bellows is bent, and when the bellows are bent due to a load, the adjacent cylinders come into contact with each other. What to do No, it is possible to prevent disconnection of the external electric wire bellows portion is smoothly bent.

The invention of claim 5 is characterized in that, in the invention of claim 4 , the thickness of the rib in the circumferential direction of the external electric wire is made smaller toward the external electric wire side, and the thickness of the rib is smaller toward the external electric wire side. Since it is formed, the bellows part can be bent more easily toward the external wire side, and the bellows part bends smoothly as a whole, so that the external wire does not bend at an acute angle at the end of the bellows part and the external wire breaks. Can be prevented.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the insertion plug is installed inside the insertion plug main body in which a plug blade insertion opening into which the plug blade of the plug is inserted is formed. A blade receiving spring that makes electrical contact with the blade inserted into the insertion plug body through the blade insertion port, and a caulking part where the other end of the external wire drawn into the insertion plug body is caulked. A plurality of plug-side conductors having, each plug-side conductor,
It is configured by combining the plug side blade receiving spring part with the blade receiving spring and the plug side wire connecting part with the caulking part.The plug side blade receiving spring part is made of brass, and the plug side wire connecting part is made conductive. It is characterized by being formed from a copper-based alloy having a high modulus and a small elasticity, and the plug-side conductor is constituted by connecting the plug-side blade receiving spring portion and the plug-side electric wire connecting portion. Different materials can be used for the blade receiving spring part and the plug side wire connecting part, the plug side blade receiving spring part is made of brass, and the plug side wire connecting part is made of a copper alloy with high conductivity and low elasticity. Since it is formed, by forming the plug-side blade receiving spring that requires elasticity from brass having high elasticity, the blade and the blade receiving spring can be surely brought into contact with each other, and there is no need for elasticity. plug By forming the wire connection part from a copper-based material with high conductivity and low elasticity, the caulking state of the external wire does not become loose easily due to aging, and the contact resistance between the plug-side wire connection part and the external wire increases. It is possible to prevent an increase in heat generation, and since the plug-side wire connection part is made of a material with high conductivity,
The contact resistance between the plug-side wire connection part and the external wire can be reduced, and it is possible to prevent an increase in heat generation due to the variation in contact resistance during manufacturing. Therefore, the contact resistance during manufacturing can be easily managed and the yield can be improved. Become.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) An embodiment of the present invention will be described with reference to FIGS. The table tap includes an inner case 10 formed of a material having excellent heat resistance and tracking resistance (for example, thermosetting resin),
The inner shell 10 has a tap portion 1 formed of a relatively soft material having excellent impact resistance (for example, a thermoplastic resin) and formed with an outer shell 20 enclosing the inner case 10. The part of the blade 10 where the blade insertion opening 11 is provided is exposed. External wire 40 from the outer shell 20
Is pulled out, and the insertion plug 50 is connected to the other end of the external electric wire 40.

The inner case 10 includes a body 12 to which a pair of conductors 31 are attached, and a cover 1 attached to the body 12.
It is formed by joining 3 and 3 with a crimping tack 14.
Two protrusions 15 are formed on the outer peripheral surface of the inner case 10 at two locations on the upper surface and one location on the front surface, and a pair of blade insertion holes 11 are formed in each of these protrusions 15.

Both conductors 3 arranged in the inner case 10.
1, 31 are blade receiving spring portions 32 formed in a shape having a blade receiving spring 33 at a portion corresponding to each blade insertion opening 11 at one end portion and an intermediate portion in the longitudinal direction, and from one end side of the central piece 36a. An electric wire connecting portion 3 in which an electric wire caulking portion 37 to which an external electric wire 40 is connected by crimping crimping is continuously and integrally provided
6 and 6. A caulking piece 34 having a dowel hole 34a is formed on the other end side of the blade receiving spring portion 32 in the longitudinal direction, and a dowel hole 3 is provided on the other end side of the central piece 36a of the wire connecting portion 36.
A caulking piece 38 having a dowel 38a projectingly provided at a portion corresponding to 4a is continuously and integrally formed. By caulking the dowel 38a in the dowel hole 34a, the blade receiving spring portion 32 and the wire connecting portion 36 are joined together. To be done. Further, a pair of claw pieces 35 are formed by cutting and raising in the middle portion in the longitudinal direction of each blade receiving spring portion 32, and the pair of claw pieces 35 are connected to the body 1 described above.
The conductors 31 are fixed to the body 12 by being press-fitted into the pair of locking holes 17 provided in the second body 2. Here, the inside of the body 12 is a partition wall 1 that runs along the longitudinal direction.
9 is formed, and the partition wall 19 insulates the two conductors 31, 31 from each other.

As described above, the conductor 31 has the blade receiving spring 33.
It is divided into a blade receiving spring portion 32 having a wire and a wire connecting portion 36 having a wire caulking portion 37. Since the blade receiving spring portion 32 and the wire connecting portion 36 can be formed of different materials, elasticity is improved. Brass is used for the material of the necessary blade receiving spring portion 32, and a copper-based alloy having high conductivity and small elasticity (for example, an alloy of copper and iron, is used for the material of the wire connecting portion 36 that does not require elasticity, Alternatively, an alloy of copper and tin) is used.
Therefore, compared with the case where the blade receiving spring portion 32 and the electric wire connecting portion 36 are integrally formed of brass, the electric wire connecting portion 3
Since a material having low elasticity can be used for 6, the loosening is unlikely to occur in the caulking state between the electric wire caulking portion 37 and the core wire of the external electric wire 40 due to aging, and the electric wire caulking portion 3
It is possible to prevent an increase in the contact resistance between the core wire 7 and the core wire, and suppress an increase in heat generation due to an increase in the contact resistance. Moreover, since the electric wire connecting portion 36 is made of a material having good conductivity, the contact resistance at the electric wire crimping portion 37 may be reduced due to variations in initial manufacturing (variations in crimping state of the core wire to the electric wire crimping portion 37, etc.). It is possible to prevent an increase in heat generation and increase the margin for the control value of the contact resistance between the wire crimping portion 37 and the core wire.
The contact resistance at the time of manufacturing can be easily controlled, and the yield can be improved.

Then, the body 12 to which the conductor 31 has been fixed as described above is covered with the cover 13, and the caulking tack 14 is inserted into the through holes 16a and 16b formed in the body 12 and the cover 13, respectively. By body 1
2 and the cover 13 are joined. At this time, the wire connection part 3
Cutouts 12a, 12a are formed in the portion of the body 12 corresponding to the wire crimping portion 37 provided at one end of the wire 6, and the wire crimping portion 37 is cut from the one end of the inner case 10 through the cutouts 12a, 12a. The external electric wire 40 is connected to the electric wire caulking portion 37 protruding from the inner case 10 by caulking. A hole 39 is provided in the electric wire connecting portion 36 in the vicinity of the electric wire crimping portion 37. When the core wire of the external electric wire 40 is caulked to the electric wire crimping portion 37, the tip of the core wire completely covers the hole 39. Whether or not the caulking state is good or bad can be discriminated by whether or not the caulking state is present.

Grooves 18a, 1 running along the thickness direction of the inner case 10 are formed in the surface of the body 12 and the cover 13 between the portions where the electric wire connecting portions 36, 36 project.
8b are formed respectively, and when the outer shell 20 is secondarily formed, the grooves 18a, 18b are filled with an insulating thermoplastic resin (for example, vinyl chloride), so that both wire connecting portions 36, 36 are formed. The creepage distance between them is increased, and the tracking resistance is improved. In addition, grooves 18c, 18c for accumulating water droplets are formed in the interior of the body 12 and the cover 13 where the respective wire connecting portions 36 project, and the water droplets that have penetrated into the inner case 10 from the blade insertion opening 11 are formed. Since the water is accumulated in the groove 18c, it is possible to prevent the water droplets from accumulating between the electric wire connecting portions 36, 36 of different polarities and causing tracking damage.

The outer shell 20 includes the inner case 1 as described above.
The external electric wire 40 is attached to the electric wire crimping portion 37 protruding from 0 to the outside.
Is formed by secondary molding on the outer circumference of the inner case 10, and covers substantially the entire circumference of the inner case 10 excluding the surface of the protrusion 15 and the connection between the wire crimping portion 37 and the external wire 40. The part is also covered with the outer shell 20. In addition, two protrusions 15 formed on the upper surface of the inner case 10, and
At a portion of the outer shell 20 near one protrusion 15 formed on the front surface of the inner case 10, the blade insertion opening 1 on the ground electrode side is provided.
A concave groove 27 indicating the ground electrode side is formed in the vicinity of 1, and the polarity of the blade insertion slot 11 can be easily determined by the concave groove 27. In addition, the protective coating of the external electric wire 40 is also provided with a ridge 41 indicating the ground electrode side.

The outer shell 20 from which the external electric wire 40 is drawn out.
The plurality of cylindrical bodies 22 that cover the peripheral surface of the external electric wire 40
However, the bellows portion 21 formed by being connected to the peripheral surface of the outer shell 20 in the up-down direction and the left-right direction via ribs 23 and 24 formed respectively along the peripheral surface of the outer shell 20 has a bellows portion 21 formed therein. It is formed integrally with. Here, the thickness dimension of the ribs 23 formed in the vertical direction of the outer shell 20 in the circumferential direction of the external electric wire 40 is formed to be gradually smaller toward the external electric wire 40 side, and the bellows portion 21 is closer to the external electric wire 40 side. Is easily bent, the external electric wire 40 does not bend at an acute angle at the end of the bellows portion 21, and the bellows portion 21 bends smoothly as a whole, thereby preventing disconnection of the external electric wire 40. In the bellows portion 21, the width dimension of the tubular body 22 is widened, and the width dimension of the groove 25 between the adjacent tubular bodies 22 is thin, and when the bellows portion 21 is bent, the adjacent tubular bodies 22 come into contact with each other. Therefore, even when a large load is applied to the bellows portion 21, the bellows portion 22 can be prevented from being bent at an acute angle, and the disconnection life of the external electric wire 40 can be improved. An electric wire holding hole 26 is provided between the ribs 23 and 24. When the outer shell 20 is molded, the outer electric wire 40 is moved by pressing the outer electric wire 40 with the mold through the electric wire holding hole 26. Is prevented, and the width of the groove 25 is formed to be narrow within a range in which the strength of the mold can be secured.

On the other hand, in the insertion plug 50, as shown in FIGS. 5 to 8, the blade block 51 in which the base of the blade 53 is held on both side surfaces of the movable body 52 and the blade block 51 are rotatable. And a support body 60 for holding the support body 60 and an outer shell 70 that covers the periphery of the support body 60. Each support body 60 is equipped with a pair of terminal fittings 61 electrically connected to the blade 53. To be done.

The movable body 52 of the blade block 51 is made of an insulating material such as a synthetic resin and has a flat surface on the front side and an arc shape on the rear side.
A recess 54 is formed into which the base of No. 3 fits. A notch groove 54a is formed in one portion of the peripheral edge of the recess 54 on the front surface side of the movable body 52. The blade 53 has notches 53a on both side edges.
And the notch groove 54a of the movable body 52 in the notch 53a.
In the form in which both sides of a are engaged, the blade 5 is placed in front of the movable body 52.
3 is protruding. In this way, by fitting the both sides of the cutout groove 54a into the cutout 53a, the blade 53 is held against the movable body 52 without wobbling. A rotary shaft 55 is punched out at a portion of the blade 53 which is fitted into the recess 54 of the movable body 52. The rotating shaft 55 is formed in a shape in which a stop pin 55a is provided in the center of a large-diameter main shaft (not shown), and the main shaft engages with the terminal fitting 61.

The terminal fitting 61 is composed of a blade holding portion 65 for rotatably holding the blade 53, and a terminal plate 66 having an electric wire connecting portion 66a to which the core wire of the external electric wire 40 is connected by caulking and crimping. It The dowel hole 65 is provided in the blade holding portion 65.
The caulking piece 65b having a is formed continuously and integrally, and the caulking piece 66c is formed continuously from the end edge of the wire connecting portion 66a so that the dowel 66b fitted in the dowel hole 65a is projected. By caulking the dowel 66b in the dowel hole 65a, the blade holding portion 65 and the terminal plate 66 are joined together.

The movable body 52 of the blade block 51 is housed in a housing recess 62 of a support body 60 made of an insulating material such as synthetic resin. The storage recess 62 is formed in the front part of the support 60 and is open in both the front and the vertical directions. The support body 60 is formed by connecting a pair of half-split bodies 60a and 60b, and one half-split body 60a has a plurality of (four) coupling hooks 63 toward the other half-split body 60b.
And a coupling hole 64 that engages with the coupling hook 63 is formed in the other half-divided body 60b. Coupling hook 6
3 are provided on both sides of the storage recess 62, and a pair is provided on the rear part of the support body 60.
By coupling 0a and 60b at three locations, both half-divided bodies 60a and 60b are coupled at any location without rising.

By the way, the support body 60 has two halves 60.
The terminal fitting 61 is held between a and 60b, the front end of the terminal fitting 61 is exposed at the inner peripheral surface of the storage recess 62, and the rear end of the terminal fitting 61 projects from the rear surface of the support 60. . At the part of the blade holding part 65 exposed inside the housing recess 62 in the terminal fitting 61, the blade block 51 is provided.
A shaft hole (not shown) fitted to the main shaft of the rotary shaft 55 of
Is formed, and the stop pin 5 protruding from the rotary shaft 55 is formed.
5a is caulked and fixed in a hole 67a provided at the center of the disc spring 67. That is, the terminal metal fitting 61 is sandwiched between the disc spring 67 and the base of the blade 53, and the blade 53 is rotatably held with respect to the terminal metal 61. Are electrically connected. Since the disc spring 67 has a spring force that presses the terminal fitting 61 toward the blade 53, an appropriate frictional force acts between the blade 53 and the terminal 61. The 53 can be stopped at an arbitrary position with respect to the terminal fitting 61.

On the other hand, from the rear surface of the support 60, the terminal fitting 6
The first terminal plate 66 is projected, and the core wire of the external electric wire 40 is connected to the electric wire connecting portion 66a by caulking the core wire of the external electric wire 40 with respect to the electric wire connecting portion 66a of the terminal plate 66. A pair of press-fitting pieces 68 are provided at the front and rear intermediate portions of the blade holding portion 65 of each terminal fitting 61, respectively. The press-fitting piece 68 is formed in a tapered shape, and is press-fitted into a fixing hole (not shown) formed in the one half-divided body 60b. A pair of convex ribs 6 is provided on the half body 60b.
Since the projecting ribs 9 are provided, fixing holes are formed on both sides of each of the convex ribs 69. As described above, by press-fitting the press-fitting piece 68 into the fixing hole, the terminal fitting 61
Is fixed to the half-divided body 60b, and since the blade 53 is rotatably coupled to each terminal fitting 61, the blade block 51 is held by the half-divided body 60b. . By connecting the other half-divided body 60a to the half-divided body 60b holding the blade block 51 and the terminal fitting 61 in this manner, the blade block 51 is rotatably held with respect to the support body 60. Of.

As described above, the blade block 1 and the supporting body 60 are connected to each other, and the external electric wire 40 is caulked and connected to the electric wire connecting portion 66a of the terminal plate 66 protruding from the supporting body 60 to the outside. The outer shell 70 is simultaneously molded. It should be noted that, of the pair of blades 53 of the insertion plug 50, the outside of the blades 53 electrically connected to the conductor 31 on the side where the groove 27 for indicating the ground electrode side is formed in the tap portion 1. A concave groove 71 for indicating the ground electrode side is provided in the shell 70.
The concave groove 71 allows the polarity of the blade 53 to be easily discriminated. In addition, the outer shell 70 has recesses 72 formed on the front and back, and the fingertips are caught in the recesses 72, so that the insertion plug 50 can be easily inserted and removed.

Further, a plurality of cylindrical bodies 74 covering the peripheral surface of the external electric wire 40 are provided at the outer shell 70 portion from which the external electric wire 40 is drawn out at the vertical and horizontal portions on the peripheral surface of the outer shell 70. A bellows portion 73 formed by being connected via ribs 75 and 76 formed along the circumferential surface of the shell 70 is integrally formed with the outer shell 70.
Here, ribs 75 formed in the vertical direction of the outer shell 70
The thickness of the external electric wire 40 in the circumferential direction is 4
The bellows portion 73 is formed so as to be gradually smaller toward the 0 side, and the bellows portion 73 becomes easier to bend toward the external electric wire 40 side, and the outer electric wire 40 does not bend at an acute angle at the end portion of the bellows portion 73. By bending smoothly overall,
The external electric wire 40 is prevented from breaking. In this bellows portion 73, the width dimension of the cylindrical body 74 is widened and the adjacent cylindrical body 74 is
The width dimension of the groove 77 between them is narrowed, and when the bellows portion 73 is bent, the adjacent cylinder bodies 74 come into contact with each other.
Even when a large load is applied to the bellows, the bellows portion 73 can be prevented from being bent at an acute angle, and the disconnection life of the external electric wire 40 can be improved. An electric wire pressing hole 78 is provided between the ribs 75 and 76, and the external electric wire 40 is moved by pressing the external electric wire 40 with a mold through the electric wire pressing hole 78 when the outer shell 70 is molded. Is prevented, and the width dimension of the groove 77 is formed thin within a range in which the strength of the mold can be secured.

(Second Embodiment) A table tap according to the present embodiment will be described with reference to FIGS. 9 to 12. The same components as those of the table tap of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Further, the configuration of the tap portion 1 side is the same as that of the first embodiment, and therefore the description thereof will be omitted.

The insertion plug 50 is made of a material having excellent heat resistance and tracking resistance.
0 and an outer shell 90 which is made of a relatively soft material having excellent impact resistance and wraps the inner case 80.
The part where 1 is provided is exposed.

The inner case 80 is formed by connecting a body 82 to which the pair of conductors 101 are attached and a cover 83 attached to the body 82 with assembly screws 84. A protrusion 85 is formed on the upper surface of the inner case 80, and a pair of blade insertion holes 81 are opened in the protrusion 85.

Both conductors 10 arranged in the inner case 80
Reference numerals 1 and 101 denote blade receiving spring portions 102 in which a blade receiving spring 103 is provided at a portion corresponding to the blade insertion opening 81, and the external electric wire 40.
And a wire connecting portion 106 having a wire crimping portion 107 connected by crimping crimping. Blade receiving spring 1
A blade 105 is fixed to one end side of 02 and a caulking piece 104 having a dowel hole 104a is formed on the other end side. Further, the dowel 108a is provided at a portion corresponding to the dowel hole 104a.
The caulking piece 108 protruding from the wire is continuously formed integrally with the electric wire caulking portion 107.
By caulking at “a”, the blade receiving spring portion 102 and the electric wire connecting portion 106 are coupled. 1 blade on the bottom of the body 82
An insertion hole (not shown) for inserting 05 is inserted. The plug blade 105 is inserted into this insertion hole and the conductor 101 is inserted into the body 82 with the plug blade 105 protruding from the bottom surface of the body 82. Fixed to. Here, a partition wall 89 is formed inside the body 82, and the partition wall 89 insulates the two conductors 101, 101 from each other.

As described above, the conductor 101 is the blade receiving spring 1
Blade receiving spring portion 102 having 03, and wire crimping portion 107
Since the blade receiving spring portion 102 and the electric wire connecting portion 106 can be formed of different materials, brass is used as the material of the blade receiving spring portion 102 that requires elasticity. An electric wire connecting portion 10 which is used and does not require elasticity
For the material of No. 6, a copper-based alloy having high conductivity and small elasticity (for example, an alloy of copper and iron or an alloy of copper and tin) is used. Therefore, compared with the case where the blade receiving spring portion 102 and the electric wire connecting portion 106 are integrally formed of brass, a material having a small elasticity can be used for the electric wire connecting portion 106, so that the electric wire caulking portion can be aged over time. Looseness does not easily occur in the caulked state between the core wire 107 and the external electric wire 40, the contact resistance between the electric wire caulked portion 107 and the core wire can be prevented from increasing, and an increase in heat generation due to an increase in contact resistance can be suppressed. Moreover, the wire connecting portion 106
Since a material with good conductivity is used for the, the contact resistance at the wire crimping portion 107 increases due to variations in initial manufacturing (variations in the crimping state of the core wire to the wire crimping portion 107, etc.), and heat is generated. It is possible to prevent the increase, and since the margin for the control value of the contact resistance between the wire crimping portion 107 and the core wire becomes large, it becomes easy to control the contact resistance in manufacturing and the yield is improved.

Then, by covering the body 82 to which the conductor 101 is fixed as described above with the cover 83 and connecting the body 82 and the cover 83 with the assembly screw 84,
The body 82 and the cover 83 are joined together. Each conductor 10
Notches 82a and 83a are formed in the body 82 and the cover 83 corresponding to the first crimping pieces 104 and 106, respectively, and the wire crimping portion 107 is provided with the notches 82a and 8a.
The external electric wire 40 is connected to the electric wire caulking portion 107 protruding from the inner case 80 by caulking.

The outer shell 90 has the inner case 8 as described above.
The external electric wire 4 is attached to the electric wire crimping portion 107 protruding from 0 to the outside.
It is formed by secondary molding on the outer circumference of the inner case 80 after connecting 0, and covers substantially the entire circumference of the inner case 80 excluding the surface of the protruding portion 85, and the electric wire caulking portion 107 and the external electric wire 40.
The connecting portion with is also covered with the outer shell 90. A concave groove for polarity display may be provided in a portion of the protruding portion 85 near the ground electrode side plug blade insertion opening 81, and the polarity of the plug blade insertion opening 81 can be easily determined by the concave groove.

By the way, as shown in FIG.
2 and the electric wire connecting portion 10 on the surface of the cover 83
Grooves 88a and 88b that run along the thickness direction of the inner case 80 may be formed in the regions between the regions where 6, 6 project, respectively. When the outer shell 90 is secondarily formed, the grooves 88a and 88b may be formed. Since 88b is filled with an insulating resin (for example, vinyl chloride), the resin filled in the grooves 88a and 88b insulates the electric wire connecting portions 106 and 106 from each other, and the electric wire connecting portions 106 and 106 are electrically connected to each other. The creepage distance is increased and the tracking resistance is improved. Also, the body 82
And the electric wire connecting portions 106, 106 in the cover 83
A groove 88c for accumulating water droplets may be formed in the inner part of the portion where the water drops project, and the water droplets that have penetrated into the inner case 80 from the plug blade insertion opening 81 are accumulated in the groove 88c.
It is possible to prevent water droplets from accumulating between 1 and 101 to cause tracking destruction.

[0036]

As described above, according to the first aspect of the invention, the tap portion having the blade insertion opening into which the blade of the plug is inserted is formed, and the blade is inserted inside the tap portion and the blade insertion opening is provided. Blade receiving spring that makes electrical contact with the blade inserted into the tap section,
And a plurality of conductors having a caulking portion to which one end of the external electric wire drawn into the tap portion is caulked and coupled, and an insertion plug connected to the other end of the external electric wire. The blade receiving spring portion having a spring and the electric wire connecting portion having a caulking portion are connected to each other, the blade receiving spring portion is formed of brass, and the electric wire connecting portion has high conductivity and small elasticity The tap portion is formed on the outer circumference of the inner case so as to cover the inner case in which the conductor is installed and the outer circumference of the inner case over substantially the entire circumference.
It is composed of an outer shell formed by secondary molding of insulating resin.Each conductor is installed in the inner case with the caulked part protruding from the inner case, and each conductor on the surface of the inner case Behind the part where the body protrudes , each conductor protrudes
Between the part to be used and the internal space where each conductor is stored
A first groove for accumulating water droplets that has penetrated into the inner case is formed in the case portion, and an outer shell is formed in a portion between the portions of the inner case surface where the conductors protrude.
A second groove is provided which is filled with an insulating resin to be formed. Thus, since the conductor is configured by connecting the blade receiving spring portion and the electric wire connecting portion,
Different materials can be used for the blade receiving spring portion and the electric wire connecting portion, the blade receiving spring portion is formed of brass, and the electric wire connecting portion is formed of a copper-based alloy having high conductivity and small elasticity, By forming the blade receiving spring that requires elasticity from brass, which has a large elasticity, the blade and the blade receiving spring can be surely brought into contact with each other, and the electrical conductivity of the wire connection that does not require elasticity is high. Also, by forming it from a copper-based material with low elasticity, it is possible to prevent the caulking state of the external electric wire from loosening due to aging, and to prevent the contact resistance between the electric wire connection part and the external electric wire from increasing and heat generation to increase. In addition, since the wire connection part is made of a material with high conductivity, it is possible to reduce the contact resistance between the wire connection part and an external wire, and it is possible to prevent an increase in heat generation due to variations in contact resistance during manufacturing. , Therefore it easier to manage the contact resistance at the time of manufacture, there is an effect that the yield is improved.

Furthermore, since the first groove for accumulating water droplets that have infiltrated into the inner case is formed in the inner surface of the inner case, the first groove for accumulating water droplets is formed in the inner part of the portion where the conductors project. It is possible to prevent the electric conductors of different polarities from being short-circuited by the water droplets that have entered the inner case without being accumulated in the first groove and between the electric conductors of different polarities.

Moreover , the insulating resin can be filled in the second groove formed in the portion between the portions where the conductors protrude, and the insulating resin filled in the second groove can be filled. With this, it is possible to insulate the conductors from each other, increase the creepage distance between the conductors, and improve the tracking resistance.

The invention of claim 2 is characterized in that, in the invention of claim 1, the tap portion and the insertion plug are provided with a polarity display portion for displaying the polarity of the blade insertion slot and the blade, respectively. The invention according to claim 3 is characterized in that each of the polarity display portions comprises a groove formed in a portion of the surface of the tap portion and the surface of the insertion plug near the ground electrode side. There is an effect that it is possible to easily determine the polarity of the blade provided on the blade insertion opening or the insertion plug provided.

According to a fourth aspect of the present invention, in the first aspect of the present invention, a plurality of cylinders for covering the peripheral surface of the external electric wire and a peripheral portion of the external electric wire are provided at a portion where the external electric wire is pulled out from the tap portion and the insertion plug body. A bellows portion that is formed along the surface and has ribs that connect the cylinders to each other is integrally formed with the tap portion and the insertion plug body, and the width of the groove so that the adjacent cylinder bodies contact each other when the bellows portion bends. The bellows portion is formed by connecting a plurality of tubular bodies that cover the peripheral surface of the external electric wire through ribs, and the groove and the tubular body The width of the bellows is such that adjacent cylinders come into contact with each other when the bellows is bent, and when the bellows are bent due to a load, the adjacent cylinders come into contact with each other. What to do Ku, there is an effect that the bellows portion can be prevented from being broken in the external wire smoothly bent.

The invention of claim 5 is characterized in that, in the invention of claim 4 , the thickness of the rib in the circumferential direction of the external electric wire is made smaller toward the external electric wire side, and the thickness of the rib is smaller toward the external electric wire side. Since it is formed, the bellows part can be bent more easily toward the external wire side, and the bellows part bends smoothly as a whole, so that the external wire does not bend at an acute angle at the end of the bellows part and the external wire breaks. There is an effect that can prevent.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the insertion plug is mounted inside the insertion plug body, in which the insertion edge of the plug blade is formed. A blade receiving spring that makes electrical contact with the blade inserted into the insertion plug body through the blade insertion port, and a caulking part where the other end of the external wire drawn into the insertion plug body is caulked. A plurality of plug-side conductors, each plug-side conductor being configured by coupling a plug-side blade receiving spring portion having a blade receiving spring and a plug-side electric wire connecting portion having a caulking portion, The side blade receiving spring portion is formed of brass, and the plug side wire connecting portion is formed of a copper-based alloy having high conductivity and low elasticity.The plug side conductor includes the plug side blade receiving spring portion and the plug. Since it is configured by connecting the wire connection part, different materials can be used for the plug side blade receiving spring part and the plug side wire connecting part, and the plug side blade receiving spring part is made of brass, Since the side wire connection part is made of a copper-based alloy with high conductivity and low elasticity, the plug side blade receiving spring part that requires elasticity can be formed by using brass with high elasticity. By forming the plug-side wire connection part that can make sure contact with the spring and does not require elasticity from a copper-based material with high conductivity and low elasticity, the caulked state of the external wire will loosen due to aging. It is possible to prevent the heat generation from increasing due to the increase in the contact resistance between the plug side wire connection part and the external wire, and the plug side wire connection part is made of a material with high conductivity. Because it is,
The contact resistance between the plug-side wire connection part and the external wire can be reduced, and it is possible to prevent an increase in heat generation due to the variation in contact resistance during manufacturing. Therefore, the contact resistance during manufacturing can be easily managed and the yield can be improved. There is an effect that.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an inner case of a tap portion of a table tap according to a first embodiment.

2A and 2B show the above table tap, wherein FIG. 2A is a front view and FIG. 2B is a bottom view of a tap portion.

FIG. 3 shows the tap portion of the above table tap,
(A) is a front view and (b) is a side view.

FIG. 4 is a side view showing a tap portion of the above table tap.

FIG. 5 is an exploded perspective view showing a state of the insertion plug of the table tap before secondary molding.

FIG. 6 is an external perspective view showing a state before the secondary molding of the insertion plug of the above table tap.

FIG. 7 is a view showing the insertion plug of the above table tap, (a) is a front view, (b) is a side view, and (c).
Is a view from the rear.

FIG. 8 is a perspective view showing an insertion plug of the above table tap.

FIG. 9 is an exploded perspective view showing an inner case of the insertion plug of the table tap according to the second embodiment.

FIG. 10 is a perspective view showing an inner case of the above insertion plug.

11A and 11B show the same insertion plug, wherein FIG. 11A is an external perspective view, FIG. 11B is a view of the bellows portion as viewed from above, and FIG. 11C is a view of the bellows portion as viewed from the side.

FIG. 12 is an exploded perspective view showing an inner case of another insertion plug of the above.

[Explanation of symbols]

10 inner case 11 Plug blade insertion port 12 body 13 cover 31 conductor 32 blade receiving spring 33 blade receiving spring 36 Electric wire connection part 37 Wire caulking part

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ken Suzuki, 1285 Izumino, Misato-mura, Aki-gun, Mie Hayama Denki Seisakusho Co., Ltd. (56) Reference JP-A-3-222272 (JP, A) JP 4-196075 (JP, A) JP 10-321029 (JP, A) JP 6-13140 (JP, A) JP 63-21768 (JP, A) JP 53-145090 (JP , A) JP-A-6-13141 (JP, A) JP-A-7-326453 (JP, A) JP-A-9-82433 (JP, A) Real-life Sho 48-105881 (JP, U) Real-life flat 2-67583 (JP, U) Actually open 60-136478 (JP, U) Actually open 1-117084 (JP, U) Actually open 61-60483 (JP, U) Actually open 55-38442 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01R 25/00 H01R 13/03 H01R 13/52

Claims (6)

(57) [Claims] 1. A tap portion formed with a blade insertion opening into which a blade of a plug is inserted, and a blade inserted inside the tap portion and inserted into the tap portion through the blade insertion opening. And a plurality of conductors having a crimping portion to which one end of the external electric wire drawn into the tap portion is caulked and coupled, and a plug plug connected to the other end of the external electric wire. , Each conductor is constituted by connecting a blade receiving spring portion having a blade receiving spring and an electric wire connecting portion having a caulking portion, the blade receiving spring portion is formed of brass, and the electric conductivity of the electric wire connecting portion is made to form a high and elastic small copper-based alloy, the tap unit includes a case among which the conductor is OsameSo, to cover the entire circumference substantially the outer circumference of the inner casing
Formed by secondary molding of insulating resin on the outer periphery of the inner case
Constituted by an outer shell, each conductor is OsameSo in the inner case in a state of protruding from the inner casing the caulking portion, the back portion of the conductor on the surface of the inner case protrudes met
The location where each conductor projects and the location where each conductor is stored.
The first groove for accumulating water droplets that have penetrated into the inner case is formed in the portion of the inner case between the inner case and the space of the inner portion, and is formed in the portion between the portions on the surface of the inner case where the conductors project. Filled with insulating resin that forms the outer shell
Second strip, characterized in that a groove that. 2. The table tap according to claim 1, wherein the tap portion and the insertion plug are provided with polarity display portions for displaying the polarities of the blade insertion opening and the blade, respectively. 3. The table tap according to claim 2, wherein each of the polarity display portions comprises a groove formed in a portion of the tap portion and the surface of the insertion plug near the ground electrode side. 4. A plurality of cylindrical bodies that cover the peripheral surface of the external electric wire at a portion where the external electric wire is pulled out from the tap portion and the insertion plug main body, and connect the cylindrical bodies formed along the peripheral surface of the external electric wire. A bellows part having a rib is formed integrally with the tap part and the insertion plug body, and the width of the groove is narrowed and the width of the cylinder is widened so that adjacent cylinders come into contact with each other when the bellows bends. The table tap according to claim 1, wherein: 5. The table tap according to claim 4, wherein the thickness of the rib in the circumferential direction of the external electric wire is made smaller toward the external electric wire side. 6. The insertion plug comprises an insertion plug body having a blade insertion opening into which a blade of the plug is inserted, and an insertion plug which is installed inside the insertion plug body and is inserted into the insertion plug body through the insertion blade insertion opening. A blade receiving spring that is in electrical contact with the inserted blade, and a plurality of plug-side conductors having a caulking portion to which the other end of the external electric wire drawn into the insertion plug body is caulked. The plug-side conductor is formed by connecting a plug-side blade receiving spring portion having a blade receiving spring and a plug-side electric wire connecting portion having a caulking portion. The table tap according to claim 1, wherein the side wire connecting portion is formed of a copper-based alloy having high conductivity and low elasticity.