JPH08138765A - Structure for connecting linear heating element and covered conductor - Google Patents

Abstract

PURPOSE: To surely make an electric connection with a connector at high efficiency without causing shearing or tearing, etc., by inserting the insertion needle of the connector into the center of a linear heating element from one end face of the linear heating element. CONSTITUTION: The insertion needle 1a of a connector 1 is inserted into the center of the conductor 2a of a linear heating element 2 from an end face of the linear heating element 2 up to an appropriate depth. Further, an elastic ring 6 is fitted around the outer peripheral surface of the portion of the linear heating element 2 in which the insertion needle 1a exists. The conductor 2a is not exposed to the outside in a bared state but is compressed between insulating covers and connected to the connector while being compressed from outside the insulating covers by an elastic ring 4 on the covers. Therefore, an electric connection with the connector 1 can surely be made at high efficiency without causing partial shearing or tearing, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure between a linear heating element and a covered electric wire in which carbonaceous short fibers are used as a core wire and the periphery of the core wire is covered with an insulating coating.

[0002]

2. Description of the Related Art In recent years, a linear heating system in which a short carbon fiber is coated with an insulating coating on a snow melting device embedded in a road or a roof in a snowfall area, or a heating and heat retaining device embedded in a floor or a wall of a building. The body has been used as an effective heat carrier.
This heating element is very effective in that it has excellent flexibility, strength and thermal efficiency, and that a desired electric resistance value can be easily set.

[0003]

In this linear heating element, since the conductor serving as the core wire is formed by collecting carbon short fibers in a linear shape, the core wire itself is compared with respect to tension and twist. Are vulnerable. Therefore, when the linear heating elements are electrically connected to each other, the core wire from which the coating of the linear heating element is removed is twisted and connected to the core wire of the other linear heating element, or a widely known tubular shape is used. When crimping and bonding using a crimp fitting, the core wire of the linear heating element may be partially sheared or torn off by the load at the time of bonding.

Therefore, a main object of the present invention is to reliably electrically connect such a linear heating element and a covered electric wire by a simple operation without causing the above-mentioned partial shearing and tearing. It is to provide a connection structure.

[0005]

In order to achieve the above object, the present invention takes the following technical means. That is, in the connection structure for a linear heating element according to the present invention, a conductive round rod-shaped connection body having an insertion needle (1a) having a sharp tip at one end
(1), the insertion needle (1a) of this connection body (1), the carbon wire short fibers (2a) and the core wire (2a) is covered with an insulating coating material (2b) linear heating element (2 ) Is inserted into the center of the core wire (2a), the other end of the connecting body (1) is connected to the core wire (3a) of the covered electric wire (3), and the linear shape including the connecting body (1). Heating element (2)
In addition, the outer surface portions of both ends of the covered electric wire (3) are watertightly covered and sealed by heat shrinkage of the heat shrinkable synthetic resin tube (5).

[0006]

[Operation] According to the above connection structure, by inserting the sharp insertion needle (1a) of the connection body (1) from one end surface of the linear heating element (2) into the center of the carbon core wire (2a). In a state where the core wire (2a) is bare and not exposed to the outside, between the outer peripheral surface of the insertion needle (1a) and the insulation coating material (2b) over the entire insertion length of the insertion needle (1a) inside the insulation coating material (2b). Even if the core wire (1a) is a relatively fragile bundle of short carbon fibers, the core wire (1a) is reliably compressed and highly efficient without causing partial shearing, tearing, or wire breaking. Electrically connected with (1)
In addition to being able to join with, the connection part between the linear heating element (2) and the covered electric wire (3) is completely covered by the heat-shrinkable synthetic resin tube (5), so the inner conductor part is watertight. The linear heating element (2) and the covered electric wire (3) can be reliably connected in a state of being hermetically sealed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below based on an embodiment shown in the drawings. In FIG. 1, reference numeral (1) is a round rod-shaped connector having an insertion needle (1a) having a sharp tip at one end and an engagement step (1b) at the rear end of the insertion needle (1a). The connection body (1) is made of a conductive metal material. Sign
(2) is a linear heating element, and this linear heating element (2) has a carbon short fiber as a core wire (2a) and the core wire (2a) is woven or braided with heat resistant fibers (2c). And is covered with a waterproof insulating coating material (2b). The core wire (2a) is a bundle of short-back fibers, and has a large heat generation area, so that heat generation efficiency is good, and far infrared rays are emitted, so that heating efficiency is high.

Thus, in the present invention, the insertion needle (1a) of the connecting body (1) is inserted from the end face of the linear heating element (2) to the center of the core wire (2a) of the linear heating element (2) to an appropriate depth. . Further, an elastic ring (6) is fitted on the outer peripheral surface of the portion of the linear heating elements (2), (2) in which the insertion needles (1a), (1a) are contained. In this connection state, the core wire (2a) is not exposed to the outside naked, and the insertion needle (1a) is inserted over the entire length of the insertion needle (1a) inside the insulating coating material (2b).
It is connected between the outer peripheral surface of (1a) and the insulating coating material (2b), and is connected to the insulating coating material (2b) by the elastic ring (4) in a state of being compressed in the radial direction from the outside. Therefore, even if the core wire (1a) is a relatively fragile bundle of short carbon fibers, a reliable and highly efficient electrical connection can be made without causing partial shearing, tearing or wire breaking. (1)
Can be joined with. Further, the engagement step portion (1b) described above more reliably prevents the connection body (1) from being pulled out.

Further, the other end of the connecting body (1) is a covered electric wire.
(3), connected to the core wire (3a) of (3), (3a) through a suitable connecting means, for example, a known metal crimp sleeve (6), and the connecting body (1) and crimp sleeve (6) The outer surfaces of both ends of the linear heating element (2) and the covered electric wire (3) are watertightly sealed by heat shrinkage of the heat shrinkable synthetic resin tube (5). This heat-shrinkable synthetic resin tube (5) is coated on its inner surface with a heat-meltable resin that also serves as an adhesive.
As a result, the heat-shrinkable resin melts at the same time as the heat-shrinkage, and the adjacent object, that is, the covered electric wire (3) or the linear heating element.
(2) and the outer peripheral surface of the crimping sleeve (6) are joined together to achieve complete joining.

In the present invention, the sleeve-like elastic ring (4) shown in the above embodiment may be replaced by a plurality of elastic C-rings (4) as shown in FIG. The crimp sleeve (6) is a simple cylindrical one as shown in FIG.
Alternatively, as shown in FIG. 7, a covered electric wire and a connecting body such as a form in which a cylindrical body part (6a) obtained by cutting a part of a circumference and a U-shaped receiving part (6b) are connected by a connecting part (6c). Any material may be used as long as it can be electrically connected to (1) while maintaining the physical strength.

Although the embodiments considered to be typical of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments. For example, in the embodiment shown in FIG. 1, the engagement step portion (1b) is formed on the rear end face with a slightly larger diameter at the rear end portion of the insertion needle, but as shown in FIG. The outer peripheral surface of the large diameter portion may be formed in a screw-like or saw-toothed serrated shape. Further, as shown in FIG. 9, this serrated shape may be formed with directivity that facilitates insertion. In addition, the engagement step (1a) of the insertion needle (1) and the elastic ring (4) described above may be omitted. In addition, the present invention can be implemented by appropriately modifying it within the scope of providing the constituent elements, achieving the object of the present invention, and achieving the following effects.

[0012]

As described above, according to the present invention, the core of the linear heating element is exposed to the outside by inserting the insertion needle of the connecting element from one end surface of the linear heating element into the center of the linear heating element. However, the core wire is relatively fragile of the short carbon fibers because it is compressed between the outer peripheral surface of the insertion needle and the insulation coating material over the entire insertion length of the insertion needle inside the insulation coating material of the linear heating element. Even if it is a bundle of bundles, it can be reliably and highly efficiently electrically connected to the connecting body without causing partial shearing, tearing, or breaking of the wire, and the insertion needle has an end surface of the linear heating element. Since the electrical connection between the connection body and the linear heating element can be made by simply inserting the connection body into the connection body, connection work is easy, and in addition, the other end of the connection body is connected to the core wire of the covered electric wire. The outer surface of both ends of the linear heating element and the covered wire including Since the shrinkable synthetic resin tube is water-tightly covered by the heat shrinkage, the connection between the linear heating element and the covered electric wire is securely sealed inside and properly reinforced. There is a remarkable effect that it can be performed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an insertion needle and a linear heating element portion of a connection structure according to the present invention.

FIG. 2 is a cross-sectional view showing the above connection state.

FIG. 3 is a cross-sectional view showing a state in which a covered electric wire and a linear heating element are connected by a connecting body and a crimp sleeve.

FIG. 4 is a sectional view of the connection structure of the present invention.

FIG. 5 is a partial sectional side view showing another embodiment of the present invention.

FIG. 6 is a perspective view showing an example of a pressure-bonding sleeve used in the present invention.

FIG. 7 is a side view showing another embodiment of the crimp sleeve.

FIG. 8 is a side view showing another example of the connection body according to the present invention.

FIG. 9 is a side view showing still another embodiment of the connection body according to the present invention.

[Explanation of symbols]

 (1) Connection body (1a) Insertion needle (2) Linear heating element (2a) Core wire of linear heating element (2b) Coating of linear heating element (3) Coated wire (3a) Core wire of coated electric wire (5) Heat-shrinkable synthetic resin tube

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[Procedure amendment]

[Submission date] March 17, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Added

[Correction content]

[Figure 8]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] Figure 9

[Correction method] Added

[Correction content]

[Figure 9]

Claims (1)

[Claims] 1. A conductive round rod-shaped connection body (1) having an insertion needle (1a) having a sharp tip at one end, the insertion needle (1a) of the connection body (1) comprising carbon short fibers. The core wire (2a) and the core wire (2a)
Is inserted into the center of the core wire (2a) from the end face of the linear heating element (2) coated with an insulating coating material (2b), and the connecting body (1)
The other end of the wire is connected to the core wire (3a) of the covered electric wire (3), and the outer surface portions of both ends of the linear heating element (2) including the connecting body (1) and the covered electric wire (3) are heat-shrinkable synthetic resin. A connection structure between a wire heating element and a covered electric wire that are watertightly covered by a heat shrinkage of a tube (5).