JPH0550663U - Wire connection terminal - Google Patents

Abstract

(57) [Abstract] [Purpose] In the connection terminal part, at least the outer surface of the insulating sleeve forming the outer frame of the terminal is coated with a heat-sensitive paint mixed with a temperature-sensitive dye that changes color due to temperature change. The abnormal heat generation can be easily detected visually. [Structure] An insulating sleeve (2) which is a tubular body composed of a small diameter portion (2a) and a large diameter portion (2b), and wherein only one end of the small diameter portion (2a) is closed by a bottom portion (2c), Consisting of a conductive metal tube body (1) for connecting electric wires, which is closely packed in the small diameter part (2a),
A structure in which the insulating sleeve (2) is formed of a heat-shrinkable nylon resin, and at least the outer surface of the insulating sleeve (2) is coated with a heat-sensitive paint mixed with a temperature-sensitive dye that changes color due to temperature change.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric wire connecting terminal used for connecting a covered electric wire, and more particularly to an electric wire connecting terminal of a type in which a metal cylinder for connecting an electric wire is provided inside an insulating sleeve whose bottom is closed. It is a thing.

[0002]

[Prior Art]

 Generally, if abnormal heat is generated in the wire connection part of the terminal due to poor contact or overload current, it is very dangerous if it is not dealt with promptly as it will cause a fire. Therefore, in the past, for example, as disclosed in Japanese Utility Model Laid-Open No. 62-67468, a sensor was incorporated in the insulating sleeve of the terminal so that an alarm could be generated to indicate that there was abnormal heating of the set value. As shown in Japanese Patent Laid-Open No. 62-37173, it is proposed that a part of an insulating sleeve is cut out and a temperature sensor made of a material that changes color due to a temperature change is fitted therein.

[0003]

[Problems to be solved by the device]

 However, in the former known method, it is very troublesome and impractical to incorporate a sensor into a small terminal or wire an alarm, and in the latter case, a small hole is made in the insulating sleeve. While the work of fitting the temperature sensor into it is troublesome, the temperature sensor itself becomes extremely small, making it difficult to confirm.

In view of this, in the present invention, at least the outer surface of the insulating sleeve forming the outer frame of the terminal is coated with a heat-sensitive paint mixed with a temperature-sensitive dye that changes color due to temperature change, so that abnormalities in the connection terminal portion occur. The main purpose of the present invention is to provide a wire connection terminal that allows easy and reliable visual detection of heat generation and that can be manufactured at a price that is the same as conventional ones.

[0005]

[Means for Solving the Problems] In order to achieve the above object, an electric wire connecting terminal according to the present invention is a tubular body including a small diameter portion (2a) and a large diameter portion (2b). An insulating sleeve (2) whose one end of the small diameter portion (2a) is closed by a bottom portion (2c), and a conductive metal tube body (1) for wire connection which is tightly housed in the small diameter portion (2a). ) And the insulating sleeve (2) is formed of a heat-shrinkable nylon resin, and at least the outer surface of the insulating sleeve (2) is coated with a heat-sensitive paint mixed with a temperature-sensitive dye that changes color due to temperature change. did.

[0006]

[Action]

 In the wire connection terminal configured as described above, as shown in Fig. 2, the bare wire parts (3a) and (3a) obtained by peeling off the covering parts of the two covered wires (3) and (3) are twisted together. After inserting from the large diameter part (2b) into the metal cylinder (1) in the small diameter part (2a), press it from the outer peripheral surface of the small diameter part (2a) with a pressure tool, as shown in Fig. 3. However, if abnormal heat is generated in the wire connection part of the terminal due to poor contact or overload current during use, the insulating sleeve () closely fitted to the outer peripheral surface of the metal cylinder (1) ( The surface of 2) is discolored by the temperature rise, and the danger can be easily detected visually from the outside, and this can be dealt with promptly.

[0007]

【Example】

 Hereinafter, the details of the present invention will be described with reference to the embodiments shown in FIGS. In the figure, reference numeral (1) is a copper metal cylinder for connecting electric wires, and (2) is an insulating sleeve molded of heat-shrinkable nylon resin. This insulating sleeve (2) has a concentric circular large and small tubular section, that is, a small diameter portion (2a) and a large diameter portion (2b), and only one end of the small diameter portion (2a) is the bottom portion (2c). Is closed by. The metal cylinder (1) is tightly fitted inside the small diameter portion (2a). Further, the large diameter portion (2b) of the insulating sleeve (2) is formed in an inner diameter such that the covering portion of the covered electric wire (3) can be easily inserted in the uncontracted state before heating. .

At least the outer surface of the synthetic resin sleeve (2) is coated with a heat-sensitive paint mixed with a temperature-sensitive dye that changes color due to temperature change. This coating is carried out, for example, by passing the molded sleeve (2) through the interior of the spray coating machine booth by spray coating, or by soaking the sleeve (2) in a paint tank containing paint. It can be done by means of soaking. In the case of the former spray coating, only the outer surface of the sleeve (2) is coated, and in the case of the latter dipping, the entire surface inside and outside the sleeve is coated. In this coating, nylon resin with excellent water absorption was used as the material for the sleeve (2), so the coating was impregnated on the surface of the sleeve (2) and adhered firmly, which made it possible to use a relatively thin film. It can be surely applied without peeling, and the application time can be shortened.

A fine particle chromium compound is used as a temperature-sensitive dye mixed in the heat-sensitive paint, and a synthetic material such as polyethylene, polypropylene, or polyvinyl chloride, which is a molding material for an insulating sleeve, is used. An appropriate amount is mixed with the resin material. Although the color development temperature varies depending on the mixing ratio of the temperature-sensitive color elements, it is preferable that the insulating sleeve discolor at 60 to 70 degrees Celsius. The insulating sleeve (2) is preferably formed of a transparent body that allows internal see-through. This is convenient because it allows you to see through the inserted and crimped wires.

Although a typical embodiment of the present invention has been described above, the present invention is not necessarily limited to only the structure of the above-described embodiment, and within the scope of having the constituent features of the present invention and having an effect. Of course, it can be implemented by appropriately changing it.

[0011]

[Effect of the device]

 Since the present invention is configured as described above, if abnormal heat is generated at the wire connection part of the terminal due to contact failure or overload current during use, the surface of the insulation sleeve will be discolored. The danger can be easily visually detected from the outside, and in particular, since the metal cylinder is closely packed in the small-diameter portion of the insulating sleeve of the present invention, the heat of the metal cylinder is prevented. Efficiently receives and can reliably change the color at the set temperature to accurately display abnormal heat generation.In addition, the metal cylinder or the insulating sleeve itself cannot be subjected to any secondary processing or attached parts. Since it does not need to be added, it can be produced at low cost. In addition, since nylon resin with excellent water content is used as the material of the insulating sleeve, the paint is impregnated on the surface of the insulating sleeve to make it strong. To Wear, and thereby an excellent effect such coating time can also be shortened it is possible to reliably painted in peel without state with a relatively thin coating.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an electric wire connection terminal according to the present invention.

FIG. 2 is a cross-sectional view of the terminal shown in FIG. 1, showing a process of connecting a covered electric wire.

FIG. 3 is a cross-sectional view showing a state in which a covered electric wire is pressure-bonded and connected.

[Explanation of symbols]

 (1) Metal cylinder (2) Insulation sleeve (2a) Small diameter part of insulation sleeve (2b) Large diameter part of insulation sleeve (2c) Bottom part (3) Covered wire (3a) Bare wire part of covered wire

Claims (1)

[Scope of utility model registration request] 1. An insulating sleeve (2) which is a tubular body composed of a small diameter portion (2a) and a large diameter portion (2b), and wherein only one end of the small diameter portion (2a) is closed by a bottom portion (2c). The insulating sleeve (2) is made of a heat-shrinkable nylon resin, and at least the outside thereof A wire connection terminal whose surface is coated with a heat-sensitive paint mixed with a temperature-sensitive dye whose color changes with temperature changes.