JPH056545U - Electrical equipment power cord - Google Patents

Abstract

(57) [Summary] [Purpose] To find the symptom of terminal stage of disconnection early. [Structure] A temperature indicating tape 7 made of a temperature indicating material is wound around a part or the entire length of the surface of the insulating covering 6 covering the core wire 5 in the longitudinal direction, or the insulating covering 6 contains the temperature indicating material. As a result, when the core wire 5 breaks and heat is generated, the coloration state of the temperature indicating tape 7 or the insulating cover 6 changes.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  This invention is a power supply connected to various electric devices such as hair dryers and electric razors. The code is related to the early detection measures of the terminal symptom of the disconnection.

[0002]

[Prior art]

  In this type of flexible power cord, as shown in FIG. In addition, it is easy to repeatedly receive bending and twisting loads at the cord outlet of the electrical device 1. Therefore, it is easy to break the wire. It protects from accidents.

[0003]

[Problems to be solved by the device]

  However, the power cord 3 reinforces the part covered by the cord armor 4. Even if it can be done, bending and torsional loads will tend to concentrate at another point P, which is slightly out of the relevant point. At this point, a disconnection is likely to occur at the location P as shown in FIG. At the end of the disconnection A spark occurs due to the symptom and the conductive core wire 5a of the core wire 5 which remains without being cut becomes red hot. It The heater current for a hair dryer is 10 to 12 A, which is particularly large. Core with that heat Insulating coating 6 such as vinyl chloride covering wire 5 melts instantly and scatters, causing burns to the human body. It is applied or gradually vulcanized to accelerate curing, resulting in a decrease in bending performance and cracks. However, there is a problem that the core wire 5 may be exposed from the crack opening.

[0004]   The purpose of the present invention is to allow the user to detect the places where the power cord is about to break. The quick discovery and easy-to-understand facilitate power cord replacement and safety. There is a point.

[0005]

[Means for Solving the Problems]

  As shown in FIG. 1, the power cord of the present invention includes an insulating coating 6 covering the core wire 5. A temperature indicating tape 7 made of a temperature indicating material is provided over part or the entire length of the surface in the longitudinal direction. Wrap it, or mix the temperature-indicating material with the insulating coating 6 itself or on the surface. The insulating coating 6 was made to contain the temperature indicating material by applying by printing, brush coating, or the like. It is a thing.

[0006]

[Action]

  If the core wire 5 around the location where the temperature indicating tape 7 is wound breaks and heat is generated, The coloration state of group 7 changes.

[0007]   If the insulation coating 6 contains a temperature-indicating material, remove the core wire 5 The insulating coating 6 that covers is discolored. When applied, the thermochromic material directly changes color.

[0008]

[Effect of device]

  Therefore, according to the present invention, the discolored state of the temperature indicating tape 7 or the insulating cover 6 is confirmed. By doing so, maintenance and replacement of the power cord can be facilitated and safety can be ensured. It

[0009]

【Example】

  An embodiment of the present invention will be described with reference to FIG. Power cord 3 that is pulled out from the cord outlet 2 in the Chloride covering the core wire 5 at a portion slightly out of the portion covered by the armor 4. A temperature indicating tape 7 made of a temperature indicating material is wound around the surface of the insulating cover 6 such as vinyl. . The temperature indicating tape 7 uses a reversible temperature indicating pigment or an irreversible temperature indicating pigment. No. 5 is about to break, and when it generates heat, it changes color.

[0010]   Examples of the reversible thermochromic pigment include Ag₂HgI_Four, Cu₂HgI_Four, Ag ₂ HgI_Four-Cu₂HgI_FourThere are solid solutions.

[0011]   Irreversible thermochromic pigments include cobalt, nickel, iron, copper, chromium, manganese , Salts of lead, etc. are used. It contains benzene, carbonic acid group, oxalic acid group, hydroxyl group and the like. Irreversible thermochromic pigment According to the temperature indicator tape 7 used, it can be confirmed that there is an abnormality even after the use. This is advantageous for maintenance and replacement.

[0012]   The temperature indicating tape 7 is formed by removing the wing piece 7b from a part of the winding portion 7a around the insulating cover 6. Overhang, write a note on this wing piece 7b, for example, "If it changes color it is time to replace the code . It is recommended to print the contents such as ".

[0013]   FIG. 2 shows another embodiment, in which the temperature indicating tape 7 is attached to the outer diameter of the insulating cover 6. A state in which it is formed in a ring shape with a diameter smaller than that and is bound to the outer periphery of the insulating cover 6. Be prepared for. According to this, the temperature indicating tape 7 is pressed against the outer peripheral surface of the insulating cover 6. As a result, the temperature responsiveness is improved and the armor effect can be provided. Wear. The temperature indicating tape 7 may be, for example, a rubber tube or vinyl chloride. Heat-shrinkable tube, etc. coated with a temperature-indicating material by kneading or printing Should be used.

[0014]   FIG. 3 shows still another embodiment. In this embodiment, the temperature indicating tape 7 is discolored. Several temperature indicating marks 9 made of temperature indicating pigments having different temperatures are scattered. . According to this, it is possible to cope well with the occurrence of an error in the environmental temperature. Also several kinds of temperature Since the marks 9 are scattered, the positions of the power cord 3 in the circumferential direction and the longitudinal direction are not limited. Even if it runs out, it can respond well.

[0015]   Instead of wrapping the temperature indicating tape 7, the temperature indicating material is mixed into the insulating coating 6 itself. You can leave it. According to this, the trouble of winding the temperature indicating tape 7 is unnecessary. Not only can it be confirmed even if any part of the power cord 3 is cut. Also mix the temperature-indicating material. Since the inserted insulation coating 6 is in close contact with the core wire 5, the discoloration reaction is fast. In this case Diacetylene monomer or organic reversible temperature indicator is used as temperature indicator. It As the organic reversible temperature indicating material, diallylphthalides, polyaryl carbonates, etc. Rubinols, leuco auramines, amyl auramines, rhodamine B lacta Electron-donating coloration compounds such as mums, indolines, spiropyrans, and fluorans Substances, phenols, carboxylic acids, sulfonic acids, acidic phosphates and And electron-accepting compounds such as metal salts of these compounds with alcohols, thiols, carvone Acid ester, phosphoric acid ester, sulfonic acid ester, ketone, ether, sulfone There is a combination with a solvent compound such as fido. These are also paints It can also be applied directly to the surface of the power cord 3 by printing, brush painting, spray painting, etc. it can.

[0016]   In addition to the parallel cord type as the power cord, cabtire cave and It can be applied to various things such as bagging cords. The temperature indicating material may be mixed or applied. In addition, the power cord is integrated with the electrical equipment. Not limited to the extended one, the same applies to those that are detachably connected to electrical equipment. Applicable.

[Brief description of drawings]

FIG. 1 is a perspective view of a power cord attached to an electric device.

FIG. 2 is a plan view of a part of a power cord showing another embodiment.

FIG. 3 is a plan view of a part of a power cord showing still another embodiment.

FIG. 4 is a perspective view of a conventional power cord.

5 is an enlarged cross-sectional view of a part of the power cord shown in FIG.

[Explanation of symbols]

1 electrical equipment 3 power cord 5 core wire 6 Insulation coating 7 Temperature tape

Claims (2)

[Scope of utility model registration request] 1. A power cord for an electric device, characterized in that a temperature indicating tape 7 made of a temperature indicating material is wound around a part or the entire length of a surface of an insulating cover 6 covering a core wire 5 in the longitudinal direction. 2. A power cord for electric equipment, characterized in that the insulating coating 6 covering the core wire 5 contains a temperature indicating material.