JPH08220135A - Test lead and manufacture thereof - Google Patents

Abstract

PURPOSE: To obtain a test lead, and a manufacturing method thereof, in which the quality and yield are enhanced for the grip part of contactor or connection terminal. CONSTITUTION: The test lead 11 comprises electrically interconnected contactor 15 and a connection terminal 21 provided with an insulating grip part 16 formed by injecting a molten material into a mold. At least the grip part 16 on the contactor 15 side is fitted with a pipe member 17 at the body part 15c of the contactor 15 including the joint with a cord member 12 except the pin part 15b exposed at the forward end part thereof. Subsequently, the body part 15c side is set in a mold together with the pipe member 17. Finally, a molten material is injected into the mold and solidified before the mold is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test lead and a method for manufacturing the same, and more particularly, to a contact portion constituting a test lead and a grip portion provided on a connection terminal are excellent in quality and also have a high product yield. The present invention relates to a test lead that can be improved and a manufacturing method thereof.

[0002]

2. Description of the Related Art A test lead is obtained by connecting the side of a connection terminal to various measuring instruments such as an ammeter and a voltmeter, and bringing the side of a contact into contact with wiring on an electric circuit and various electronic parts. It is often used when measuring the resistance value.

FIG. 2 is an explanatory view showing an example of the structure of a conventional test lead of this type. The entire test lead 1 is attached to one end of a cord material 2 formed by coating a conductive wire 2a with an insulating resin material 2b. It is composed of the connected contactor 3 and the connection terminal 5 connected to the other end.

In this case, soft polyvinyl chloride (hereinafter, referred to as "the base 3a side" of the contactor 3 and the base 5a side of the connection terminal 5).
The grip portions 4 and 6 are formed by covering a soft synthetic resin material having a high insulating property such as "soft PVC").

In this case, the gripping portions 4 and 6 are formed on the contactor 3 and the connection terminal 5 after the base portions 3a and 5a including the connection portion with the cord material 2 are normally placed in the molding die. , A flexible raw material for forming a synthetic resin material such as soft PVC is injected into a molding die and integrally molded.

Moreover, at the time of the above-mentioned molding, the injection pressure of the molten raw material is applied to the bases 3a and 5a of the contactor 3 and the connection terminal 5 fixed in the molding die and the cord material 2 connected thereto. Since there is a possibility that it may act to cause positional displacement and deform the shapes of the gripping portions 4 and 6 after molding, the base portion 3a of the contactor 3 and the base portion 5 of the connection terminal 5 are injected before the molten raw material is injected.
The holding portion 4 and 6 were formed by preliminarily holding a position a using a pressing pin so as not to move and then injecting it.

[0007]

By the way, according to the above-mentioned conventional method using the pressing pin, the base end portion 3 and the connecting terminal 5 are also formed.
It is possible to form the gripping portions 4 and 6 while suppressing the positional movement of the base portions 3a and 5a in the molding die.

However, in the case of the above method, it is necessary to remove the holding pin after integrally forming the holding portions 4 or 6, so that the holding pin 4, 6 has a residual hole of the holding pin as a through hole. Not only is it unappealing in appearance, but there is also the risk of performance deterioration in terms of quality such as insulation and pressure resistance.

In addition, when forming the grips 4 and 6, the larger the injection amount of the molten raw material is, the larger the amount of shrinkage after cooling is, the surface of the thick wall portion is depressed, and the product yield is lowered. There was also a problem that aggravated the.

The present invention has been made in view of the above problems found in the prior art, and is excellent in the quality of the contact portions constituting the test leads and the grip portions provided in the connection terminals, and the product yield is also high. The purpose is to improve and provide.

[0011]

SUMMARY OF THE INVENTION The present invention is intended to achieve the above object. Among them, the structural feature of the invention of claim 1 is that a contactor having a grip portion and a connection terminal are coded. The test leads are electrically connected to each other via a material, and the grip portion provided at least on the side of the contact has a cord on the main body of the contact excluding the tip pin portion exposed at the tip of the contact. A pipe material externally fitted including a connection part with the material, and an insulative gripping main body portion that integrally holds the pipe material and the main body portion of the contact along the length direction thereof. It was formed in.

[0012] Further, the constitutional feature of the invention of claim 2 is that in the invention of claim 1, the grip portion provided on the side of the connection terminal is provided in a vicinity portion excluding a connection portion with a base end portion of the connection terminal. A pipe material that is externally fitted on the side of the cord material located,
This pipe material and the connection terminal are formed by an insulative gripping main body that is integrally held so as to have a substantially L shape.

On the other hand, the constitutional feature of the third aspect of the present invention is that the test lead is formed by electrically connecting a contactor having an insulating grip portion and a connection terminal to each other through a cord material. In a method of manufacturing a test lead, wherein a gripping portion is formed by injecting a molten raw material into a mold, the gripping portion provided at least on the contact side does not include a tip pin portion exposed at a tip end portion thereof. After fitting the pipe material including the connection part with the cord material to the main body of the contactor, the main body side and the pipe material are placed in a molding die, and the molten raw material is injected into the molding die. It is formed by demolding after being solidified by solidification.

Further, in the constitutional feature of the invention described in claim 4, in the invention described in claim 3, the grip portion provided in the connection terminal is located in a vicinity portion except a connection portion with a base end portion of the connection terminal. The pipe material is externally fitted to the side of the cord material to be placed, and the cord material positioned at the connection portion with the base end portion of the connection terminal is placed in the forming die together with the pipe material in a substantially L-shape.
After injecting the molten raw material into the mold to solidify it,
The purpose is to demold and form.

Further, the structural feature of the invention of claim 5 is that in the invention of claim 3 or 4, the pipe material located at a portion which is completely hidden when the grip portion is formed is injected. And a recess for increasing the contact area with the molten raw material.

[0016]

Therefore, according to the first aspect of the present invention, at least the gripping portion formed on the contactor side is in contact with the pipe member fitted on the main body side of the contactor. Since the main body for gripping is integrally formed with the main body for gripping the child, it is possible to form the main body for gripping by reducing the wall thickness by the amount of the pipe material interposed. The amount of shrinkage after cooling can be reduced by that much, and the shrinkage that tends to occur when the surface is depressed can be suppressed and the product yield can be increased. When the grip portion on the side of the connection terminal is also formed in the same manner as in claim 2, the product yield can be increased for the same reason.

On the other hand, according to the third aspect of the present invention, at least the grip portion provided in the contactor is fitted into the molding die by fitting the pipe material on the main body portion side including the connection portion of the contactor with the cord material. It is formed after the material is placed without using the holding pin, and then the molten raw material is injected into the mold and solidified.
Therefore, the injection pressure at the time of injecting the molten raw material into the molding die is evenly distributed in the molding die without being concentrated on the main body side of the contactor including the connecting portion with the cord material through the pipe material. As a result of being dispersed, it is possible to form the grip portion without causing positional displacement on the side of the main body of the contact in the molding die, and therefore, the grip portion is integrally molded without the residual marks and deformation of the pressing pin. be able to. When the grip portion on the side of the connection terminal is also formed in the same manner as in the fourth aspect, the grip portion can be integrally formed by eliminating the residual marks and deformation of the holding pin for the same reason.

Further, according to the invention of claim 5, in the invention of claim 3 or 4, the pipe material located at a portion which is completely concealed when the grip portion is formed is the molten material to be injected. Since the concave portion for increasing the contact area with the raw material is provided, it is possible to more firmly integrate the pipe material to form each grip portion.

[0019]

EXAMPLE FIG. 1 is an explanatory view showing an example of a test lead according to the present invention. The entire test lead 11 has an appropriate length formed by coating a conductive wire 12a with an insulating coating material 12b. Of the cord material 11, a contactor 15 having a base end portion 15a connected to the conductive wire 12a at one end side, and a base end portion 21a having a conductive wire 12a at the other end side. The connection terminal 21 is connected.

Of these, the contactor 15 has a tip pin portion 15b exposed at the tip thereof, and a body portion 16c excluding the tip pin portion 15b is provided with an insulating grip portion 16.

In this case, the grip portion 16 has the cord material 1 on the main body portion 16c of the contactor 15 excluding the tip pin portion 15b.
Such as a flexible PVC for integrally holding the pipe member 17 including the connection portion with the outer peripheral member 2 and the pipe member 17 and the main body portion 15c of the contactor 15 along the length direction thereof. It is formed of an insulating gripping main body 18 made of a synthetic resin material.

On the other hand, the grip 22 provided on the side of the connection terminal 21 having an appropriate structure such as a banana plug can be formed under the conventional structure shown in FIG. 2, and as shown in FIG. , The base end 21a of the connection terminal 21
The cord material 12 located in the vicinity of the portion except the connection portion 25 with
Insulating grip made of a synthetic resin material such as soft PVC for integrally holding the pipe member 23 fitted on the side of and the pipe member 23 and the connection terminal 21 so as to have a substantially L shape. The main body portion 24 can be formed in the same manner as the contactor 15 side.

At this time, when the connection terminal 21 is formed of a banana plug as shown in the drawing, a cylindrical protective cover portion 2 for covering the tip portion 21b of the connection terminal 21.
2a is also formed integrally with the grip body 24.

The pipe material 17 forming the grip portion 16 of the contact 15 and the pipe material 23 forming the grip portion 22 of the connection terminal 21 are made of metal and have insulating properties. A molded product made of a synthetic resin material can also be used. When a molded product made of an insulating synthetic resin material is used, as shown in FIG. 2, by providing projecting portions 17a and 23a which are projected from the base end sides of the grasping body portions 18 and 24 to some extent, the grasping body portion is provided. It is also possible to adopt a structure in which the portions 18 and 24 also include portions that are not completely hidden.

Incidentally, the pipe members 17 and 23 located at positions which are completely hidden by the holding main bodies 18 and 24 are
In order to increase the contact area with the molten raw material injected at the time of manufacturing the grip portions 16 and 22, if a recess (not shown) formed by an appropriate number of through holes or holes is provided beforehand. The structure in which the pipe material 17 and the grasping main body portion 18 and the pipe material 23 and the grasping main body portion 24 are integrated more firmly can be obtained.

Next, an embodiment of the test lead manufacturing method according to the present invention will be described with reference to FIG.

That is, according to the method of the present invention, the contact 15 having the insulating grip 16 and the insulating grip 22 are also provided.
It is applied to the test probe 11 which is electrically connected to each other through the cord material 12 and the connection terminal 21 provided with the above-mentioned gripping portions 16 and 22.
Is formed by injecting the molten raw material into a molding die.

In this case, at least the grip portion 16 provided on the side of the contactor 15 includes the connecting portion with the cord material 12 in the main body portion 15c of the contactor 15 excluding the tip pin portion 15b exposed at the tip thereof. First, the pipe material 17 is externally fitted.

Thereafter, the main body portion 15c of the contactor 15 is
The side is placed together with the pipe material 17 in the molding die, and the molten raw material forming the synthetic resin material such as soft PVC is injected into the molding die and solidified. After the molten raw material is solidified in the molding die, it is removed from the mold to form the tip pin portion 15b.
In the main body portion 15c of the contactor 15 except for, a gripping portion 16 including a pipe material 17 and a gripping main body portion 18 including a connection portion with the cord material 12 is formed.

Further, the grip portion 2 provided in the connection terminal 21.
No. 2 can be formed by the above-mentioned conventional method, and the pipe material 2 is provided on the side of the cord material 12 located in the vicinity of the connection terminal 21 except the connection portion 25 with the base end 21a.
3 is externally fitted, and this pipe material 23 is approximately L in the molding die.
Formed in the same manner as the gripping portion 16 on the side of the contactor 15 by placing the molten raw material in a character shape, injecting the molten raw material into the mold to solidify, and then removing from the mold. You can also

Further, as the pipe members 17 and 23, in addition to those made of metal, molded products made of an insulating synthetic resin material can also be used. When a molded product made of an insulating synthetic resin material is used, the pipe materials 17, 23
As shown in FIG. 2, the protrusions 17a and 23a, which are protruded to some extent from the respective base end sides of the grasping main body portions 18 and 24, are used to place them in the molding die, thereby positioning them in the molding die. The grip portions 17 and 22 can be formed relatively easily.

When carrying out the method of the present invention, the pipe members 17 and 23 are held by the gripping main bodies 18 and 2.
If a concave portion (not shown) formed of an appropriate number of through holes or holes is provided in advance in a portion that is completely hidden by 4, the contact area with the molten raw material to be injected is Since it is possible to surely bite into the concave portion while increasing it, the grip between the pipe material 17 and the grip body portion 18 or between the pipe material 23 and the grip body portion 24 is more firmly integrated. The parts 16, 22 can be formed.

Since the present invention is constituted in this way, according to the invention of claim 1, at least the contact 1
The grip portion 16 formed on the side of 5 is the base end portion 1 in the contactor 15 and connected to the conductive wire 12a of the cord material 12.
Metal pipe material 17 externally fitted to main body portion 15c including 5a
And the body portion 15c of the metal pipe material 17 and the contactor 15
It can be formed with the grasping main body portion 18 that is covered so as to integrally embrace the part including the.

Therefore, the grip portion 16 can be formed by reducing the thickness of the grip body portion 18 by the amount of the metal pipe material 17 interposed, and the shrinkage amount after cooling can be reduced accordingly. It is possible to suppress the occurrence of shrinkage that tends to occur due to the surface being depressed and to improve the product yield.

Further, the connection terminal 21 as described in claim 2
The grip portion 22 on the side of is also the base end portion 21a of the connection terminal 21.
The cord material 12 located in the vicinity of the portion except the connection portion 25 with
Insulating grip made of a synthetic resin material such as soft PVC for integrally holding the pipe member 23 fitted on the side of and the pipe member 23 and the connection terminal 21 so as to have a substantially L shape. When formed with the main body 24, the contact 15
Similarly to the grip portion 16 formed on the side of the pipe member 2,
3 can be formed by reducing the wall thickness of the holding main body portion 24 by an amount corresponding to 3, and the shrinkage amount after cooling can be reduced by that amount to suppress shrinkage which is likely to occur due to the depression of the surface. The yield can be increased.

In this case, the pipe material 17 and the pipe material 2
When a molded product made of an insulative synthetic resin material is used as 3, gripping is performed by providing projections 17a and 23a that are projected to some extent from the respective base end sides of the gripping body parts 18 and 24 as shown in FIG. It is also possible to form the grip portions 16 and 22 that also include portions that are not completely hidden in the vehicle body portions 18 and 24.

Incidentally, the pipe members 17 and 23 located at the positions which are completely hidden by the holding main bodies 18 and 24 are
In order to increase the contact area with the molten raw material injected at the time of manufacturing the grip portions 16 and 22, if a recess (not shown) formed by an appropriate number of through holes or holes is provided beforehand. The structure in which the pipe material 17 and the grasping main body portion 18 and the pipe material 23 and the grasping main body portion 24 are integrated more firmly can be obtained.

On the other hand, according to the third aspect of the invention, at least the grip portion 16 of the contact 15 has the cord material 12.
After the pipe material 17 is externally fitted to the main body portion 15c side of the contactor 15 including the connection portion with and is set in the molding die without using the pressing pin, a synthetic resin material such as soft PVC is formed. It can be formed by injecting raw materials.

Therefore, the injection pressure at the time of injecting the molten raw material into the molding die is the main body portion 15 of the contactor 15 including the connecting portion with the cord material 12 through the pipe material 17.
Since it can be evenly dispersed in the mold without being concentrated on the c side, shrinkage after cooling can be reduced to suppress shrinkage that tends to occur due to surface depression and to increase product yield. Besides, the main body 1 of the contactor 15 in the molding die
It is also possible to form the grip portion 16 without causing positional displacement on the 5c side, and as a result, it is possible to integrally mold the grip portion 16 without leaving residual marks or deformation of the pressing pin.

Further, the connection terminal 21 as described in claim 4
The grip portion 22 on the side of is also the base end portion 21a of the connection terminal 21.
The cord material 12 located in the vicinity of the portion except the connection portion 25 with
The pipe material 23 is externally fitted on the side of, and the pipe material 23 and the pipe material 23 are placed in a molding die so as to have a substantially L-shape, and the molten raw material is injected into the molding die to be solidified. In the case of molding, similarly to the gripping portion 16 formed on the side of the contact tentacle 15, the gripping main body portion 24 may be thinned and formed by the amount of the pipe material 23 interposed. The amount of shrinkage after cooling can be reduced by that amount, the shrinkage that tends to occur due to the depression of the surface can be suppressed, the product yield can be improved, and the displacement of the connection terminal 21 in the molding die toward the base end 21a side can be achieved. It is also possible to form the gripping portion 22 without causing the occurrence, and as a result, it is possible to integrally mold the gripping portion 22 without the residual marks and deformation of the pressing pin.

Moreover, at this time, the pipe members 17, 23
When a molded product made of an insulative synthetic resin material is used as the mold, as shown in FIG. By placing the grips 17 and 22 in the molding die relatively easily, the gripping portions 17 and 22 can be formed.

Further, as in the invention described in claim 5, the pipe members 17, 23 are provided with a gripping main body 18,
If an appropriate number of recesses (not shown) formed by through holes or holes are provided in advance in a portion that is completely hidden by 24, the contact area with the molten raw material to be injected can be increased. Not only can it be increased in size, but also the molten raw material can be solidified while surely biting into the recess, so that between the pipe material 17 and the gripping main body portion 18, or
It is possible to form the grip portions 16 and 22 in which the pipe material 23 and the grip body portion 24 are more firmly integrated.

[0043]

As described above, according to the first aspect of the present invention, the gripping portion formed at least on the contact side is externally fitted to the main body side of the contact. Since it is formed of a pipe material and a gripping body portion that integrally holds the pipe material and the main body portion side of the contactor, the gripping main body portion is formed by the amount of the pipe material interposed. Molding can be performed with a reduced thickness, and the shrinkage amount after cooling can be reduced by that amount to suppress the shrinkage that tends to occur due to the depression of the surface and improve the product yield. When the grip portion on the side of the connection terminal is also formed in the same manner as in claim 2, the product yield can be increased for the same reason.

On the other hand, according to the third aspect of the present invention, at least the grip portion provided in the contactor is fitted into the forming die by fitting the pipe member on the main body portion side including the connection portion of the contactor with the cord material. It is formed after the material is placed without using the holding pin, and then the molten raw material is injected into the mold and solidified.
Therefore, the injection pressure at the time of injecting the molten raw material into the molding die is evenly distributed in the molding die without being concentrated on the main body side of the contactor including the connecting portion with the cord material through the pipe material. As a result of being dispersed, it is possible to form the grip portion without causing positional displacement on the side of the main body of the contact in the molding die, and therefore, the grip portion is integrally molded without the residual marks and deformation of the pressing pin. be able to. When the grip portion on the side of the connection terminal is also formed in the same manner as in the fourth aspect, the grip portion can be integrally formed by eliminating the residual marks and deformation of the holding pin for the same reason.

Further, according to the invention of claim 5, in the invention of claim 3 or 4, the pipe material located at a portion which is completely concealed when the grip portion is formed is the molten material to be injected. Since the concave portion for increasing the contact area with the raw material is provided, it is possible to more firmly integrate the pipe material to form each grip portion.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a main part structure of an embodiment of a test lead according to the present invention.

FIG. 2 is an explanatory diagram showing a main part structure of another embodiment of the test lead according to the present invention.

FIG. 3 is an explanatory diagram showing a structural example of a conventional test lead.

[Explanation of symbols]

 11 Test Lead 12 Code Material 12a Conductive Wire 12b Insulating Cover Material 15 Contact 15a Base End 15b Tip Pin 15c Main Body 16 Grip 17 Pipe Material 17a Projection 18 Grip Main Body 21 Connection Terminal 21a Base End 21b Tip part 22 Gripping part 22a Protective gabber part 23 Pipe material 23a Projecting part 24 Gripping main body part 25 Connecting part

Claims (5)

[Claims] 1. A test lead in which a contactor having a grip portion and a connection terminal are electrically connected to each other via a cord material, and at least the grip portion provided on the contactor side has a tip end portion thereof. A pipe material that is externally fitted to the main body of the contact excluding the exposed pin portion including the connection portion with the cord material, and the pipe material and the main body of the contact are arranged along the length direction. A test lead formed by an insulating gripping main body that is integrally held as a whole. 2. A pipe member externally fitted to the side of a cord member located near a portion of the connection terminal except for a connection portion with a base end portion of the connection terminal, and the grip member is connected to the pipe member. 2. The test lead according to claim 1, wherein the terminal and the insulating gripping main body are integrally held so as to have a substantially L shape. 3. A test lead formed by electrically connecting a contactor having an insulating grip portion and a connection terminal to each other via a cord material, wherein the grip portion injects a molten raw material into a molding die. In the method of manufacturing a test lead formed by, at least the grip portion provided on the side of the contact includes the connecting portion with the cord material in the main body of the contact excluding the tip pin portion exposed at the tip end thereof. After externally fitting the pipe material, the main body side is placed together with the pipe material in a molding die, and the molten raw material is injected into the molding die to be solidified, followed by demolding. And method for manufacturing test leads. 4. The grip portion provided in the connection terminal is configured such that a pipe material is externally fitted to the side of the cord material located in the vicinity of the connection terminal except the connection portion with the base end portion of the connection terminal. The cord material located at the connection part of is placed in the forming die together with the pipe material so as to have a substantially L shape, and the molten raw material is injected into the forming die to be solidified and then released from the die. The test lead manufacturing method according to claim 3, wherein 5. The pipe material, which is located at a portion that is completely hidden when the grip portion is formed, is provided with a recess for increasing a contact area with the molten raw material to be injected. Item 3. A method of manufacturing a test lead according to item 3 or 4.