JPH0785914A - Bagworm clip for live-wire operation and its manufacture - Google Patents

Abstract

PURPOSE:To prevent the periphery of a crocodile clip in advance from contact other therminals to cause short circuit accidents in service by catching one terminal with a clip out of many terminals arranged in high density. CONSTITUTION:This bagworm clip 10 is constituted such that the periphery of a crocodile clip is roughened by applying roughening processing to the peripheral surface of the crocodile's clip 10 and a strong insulating coat is made on the periphery of the roughened crocodile clip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called worm clip used for connecting working terminals such as communication lines and a method for manufacturing the same, which is one of a large number of working terminals that are densely wired. When gripping one with a worm clip, it is possible to prevent the outer peripheral surface of the crocodile from touching another working terminal and causing a short circuit, which improves the safety of inspection, measurement and test work. It is possible to improve the efficiency of the work.

[0002]

2. Description of the Related Art A conventional worm clip has a structure shown in FIG. 2, the main body of which is made of a conductive metal material, the tip of which is a crocodile mouth portion 1, and the base portion to be picked by a finger is made of vinyl. The cover 2 is covered and insulated, and the lead wire 3 is connected to the base end. The base of the worm clip is pinched from above the vinyl cover 2 with a finger to open the crocodile mouth, and the working terminal is gripped by the crocodile mouth to connect the working terminal to the lead wire 3. Since the outer peripheral surface of the crocodile mouth of a conventional commercially available worm clip is metal-plated, if the outer peripheral surface of this crocodile mouth comes into contact with another working terminal that is wired at high density, the working terminal And a short circuit accident occurs. Especially, the inspection, measurement, and test work on the main distribution board (MDF) of the telephone line causes serious damage. Not only that, but because the inspection, measurement, and test work is performed with great care so as not to cause a short-circuit accident, the work is inefficient. For this reason, it is strongly desired to devise a worm clip so as to surely prevent the above-mentioned short circuit accident. For that purpose, it is conceivable to form an insulating coating film only on the outer peripheral surface of the crocodile mouth portion so as to insulate only the outer peripheral surface of the worm clip excluding the teeth of the crocodile mouth portion (not known). , Normally the outer peripheral surface of the alligator part is N
Since it has a smooth surface plated with i or Sn, the adhesion between the coating film and the metal surface is small, so it may be accidentally dropped during use or stored together with other tools. At that time, there is a problem that it collides with other tools and the coating film peels off, making it unusable. Furthermore, when the coating film is formed, the wettability with the outer peripheral surface of the crocodile mouth is poor. Not only is it impossible to get the conduction of the tooth surface wrapping around in the inner part, but at the corners of the outer peripheral surface of the crocodile neck, shrinkage occurs at the time of painting and heating, and a uniform insulating layer is formed on the outer peripheral portion of the crocodile mouth. There are also difficult problems.

[0003]

SUMMARY OF THE INVENTION The present invention aims to solve the above problems, and provides a worm clip formed by forming an insulating layer having a high bonding strength only on the outer peripheral surface of the worm clip, and a method for producing the clip. The task is to do.

[0004]

Means taken for solving the above-mentioned problems are constituted by the following elements. An insulating coating film was formed on the roughened outer surface of the alligator.

[0005]

[Operation] Since the worm clip according to the present invention is roughened only on the outer peripheral surface of the crocodile mouth that requires insulation, when the paint is applied to the outer peripheral surface of the crocodile mouth using a solvent-type insulating paint. However, it is necessary because the paint can ride on the outer peripheral surface of the alligator well and does not shrink at the corners, and there is little risk that the paint will go around the tooth surface and the inside of the alligator that do not require insulation. A uniform coating film with no unevenness is formed on the outer peripheral surface. When this is cured by curing, the coating film is firmly bonded to the outer peripheral surface of the crocodile mouth via the rough surface of the outer peripheral surface of the crocodile mouth. Therefore, a highly reliable insulating layer should be formed on the outer peripheral surface of the crocodile neck part that is less likely to crack or peel off from the insulating coating layer against impacts such as dropping during use or collision with tools. You can Moreover, since the insulating layer is not formed on the tooth surface of the crocodile mouth, the conductivity between the worm clip and the lead wire gripped by the clip is sufficiently ensured. A preferred method for forming the insulating coating layer is as follows. An applicator capable of blasting the outer peripheral surface of the crocodile mouth to form a rough surface on the outer peripheral surface of the crocodile mouth with fine irregularities having an average roughness of about 1 to 10 μm, and then supplying a solvent-based insulating paint from a minute tip. By uniformly applying to the outer peripheral surface of the crocodile mouth to form a uniform insulating resin coating layer, drying the resin coating layer at room temperature to evaporate the solvent, and then heat drying to perform a curing treatment. is there. Depending on the properties of the insulating paint used, the above coating and drying may be repeated to obtain the required coating thickness. According to this coating film forming method, since a rough surface having extremely fine irregularities is uniformly formed on the outer peripheral surface of the crocodile mouth portion, even if a solvent-type paint is used, the crocodile mouth having a square cross section during coating is applied. Since the metal surface is not exposed due to shrinkage at the corners of the portion, a coating layer having a uniform thickness can be reliably formed on the outer peripheral surface of the alligator opening. Moreover, since the coating layer is firmly bonded to the roughened outer surface of the alligator opening, the physical strength of the insulating layer can be dramatically improved.

[0006]

[Examples] Next, examples of the present invention will be described in detail. Acrylic styrene resin is used as the base, and the average is 1μ
A titanium oxide fine powder having a particle size of m or less and a talc powder having an average particle size of 5 μm or less are added and sufficiently mixed, and the insulating coating material is dissolved in a solvent of ethyl acetate or toluene before being used for coating. The mixing ratio of the mixed components of the insulating paint is 20 parts of titanium oxide and 18 parts of talc fine powder to 10 parts of acrylic styrene resin. Since titanium oxide is added to make the coating layer pure white, the degree of whiteness of the coating layer is adjusted by adjusting the amount of titanium oxide. Further, the addition of talc fine powder is to reduce the friction coefficient of the coating layer surface, and to improve the strength of the coating layer against scratches, the greater the amount of addition, the resistance to impact of the coating layer, Since the bonding strength with respect to the outer peripheral surface of the crocodile part decreases, it is better not to add more than the above. Further, the finer the particles of titanium oxide fine powder and the finer talc powder, the smoother the surface coating layer can be obtained, but even if the particles are finer than the above, there is no particular difference in the practical effect. The insulating paint and the solvent are preferably mixed with 10% by weight of acrylic styrene resin, 20% by weight of titanium oxide and 18% by weight of talc, and 25% by weight of ethyl acetate and 27% by weight of toluene. The higher the proportion of the solvent, the lower the viscosity and the easier the coating. However, if the viscosity is too low, the coating will easily get around the tooth surface of the alligator at the time of coating, so it is important to strike a balance between the two. A commercially available worm clip 10 is used, and the outer peripheral surface of the crocodile mouth portion 10a is uniformly blasted using white alumina having an alumina grain size of 100 mesh to roughen the outer peripheral surface of the crocodile mouth portion 10a. A large number of worm clips 10 are fixed to the holder 11 by inserting the roughened base of the worm clip into the hole 12 of the holder 11 such as a hard rubber block.
At this time, if the base is fixed to the holder 11 in a state where the alligator portion is slightly opened, the holding is stable, and this makes it possible to perform subsequent coating on the outer peripheral surface of the alligator portion, particularly coating on the side surface of the tooth. Can be easy. To prevent the paint tool from touching the tip of the teeth of the crocodile mouth, use a paint tool with a short tip such as a felt-tip pen or a cotton swab, or use a paint tip that has a minute tip. Is uniformly applied to the outer peripheral surface (including the outer surface of the tip) of the alligator portion 10a. Since the cross-sectional shape of the crocodile mouth is quadrangular, because of the surface tension of the paint, it is more likely that this corner will not be sufficiently roughened compared to other flat parts, so this corner Since there is a case where the coating film shrinks and the coating film at this corner portion becomes significantly thinner than other flat surface portions, the corner portion should be blasted more carefully or repeated overcoating should be repeated. Therefore, it is important to make sure that the thickness of the coating film at this portion is made uniform with the thickness of the other flat portion. A uniform coating film is formed on the outer peripheral surface of the crocodile mouth, which is naturally dried at room temperature, and then 60 ± 1
Heat and dry in an electric heating oven at 0 ° C. By doing the above, a uniform and glossy pure white coating layer without pinholes, blisters and uneven thickness is formed on the outer peripheral surface of the alligator portion 10a. The test results of the mechanical and electrical characteristics of the coating layer of the insulating clip prepared by the above examples are as follows.

[Table 1] Note * ₁ : The film thickness is the value measured with a micrometer before and after coating. * ₂ : Insulation resistance is a DC resistance value of 250V. * ₃ : Breakdown voltage is due to DC breakdown at a cutoff current of 0.5 mA. * ₄ : For drop impact, drop a worm clip from a height of 1 m on the concrete floor and visually check for cracks and peeling of the coating layer. * ₅ : After keeping the temperature and humidity at 85% humidity and 80 ° C for 100 hours, visually check the change of coating layer condition.

[0007]

[Effect] The invention which solves the above-mentioned problems of the present invention is not yet known. Therefore, the solution to this novel problem and the solution to the above-mentioned problems of the prior art is the effect peculiar to the present invention. That is, the present invention, the tip surface of the teeth of the crocodile mouth portion of the conventional worm clip (grip portion that requires conductivity)
Insulation coating can be applied only to the outer peripheral surface of the crocodile mouth (including the outer surface of the tip) without coating with an insulating resin coating, and when connecting other terminals to the terminals that are densely wired with a worm clip , It is possible to reliably prevent a short circuit accident that occurs when the outer peripheral surface of the crocodile mouth of the worm clip comes into contact with another activated terminal. Also, because the insulation layer has excellent adhesion, even if it collides with other tools during storage in the tool box or accidentally drops onto the floor during work, the conductor on the outer surface of the crocodile is exposed. It's hard to do, so you don't have to be nervous about its handling. Furthermore, since it is possible to reliably prevent short-circuit accidents due to contact with other terminals of the crocodile clip crocodile mouth, in order to avoid contact accidents with other terminals during inspection, measurement, and test work with the worm clip. Since it is not necessary to pay close attention, the workability can be improved, and further the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a plan view of a conventional worm clip.

[Explanation of symbols]

 1, 10a ... Alligator part 2 ... Vinyl cover 3 ... Lead wire 10 ... Plum clip 11 ... Holder 12 ... Hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Saru Wataru, 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Ltd. (72) Inventor Nori Baba 1-5 Kiba, Koto-ku, Tokyo No. 1 in Fujikura Co., Ltd. (72) Inventor Yoshie Shimada 1-5-1 Kiba, Koto-ku, Tokyo Kyoei Line Materials Co., Ltd. No. 1-6 Nihon Telegraph and Telephone Corporation (72) Inventor Yoshinori Katayama 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Nishi Mura Matsuyoshi Chiyoda, Tokyo 1-6-1, Saiwaicho in the city Nihon Telegraph and Telephone Corporation

Claims (2)

[Claims] 1. A worm clip for hot-line work, comprising an insulating coating film formed on the outer peripheral surface of a roughened crocodile mouth. 2. A roughening treatment step of blasting the outer peripheral surface of the crocodile mouth portion to form fine irregularities on the outer peripheral surface of the crocodile mouth portion, and a solvent-type insulating coating material on the roughened surface. A method for producing a maggot clip for hot-line work, comprising the steps of forming a uniform coating film using the same, and volatilizing a solvent after forming the above coating film, and then performing a curing treatment by heating.