JPS62276770A - Stop construction of wire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 3. Detailed description of the invention 〔Technical field〕 The present invention relates to an electric wire fastening structure.

[Background technology]

For example, a wiring device includes a connection terminal plate, and a terminal screw is screwed through the screw hole of the connection terminal plate, so that the electric wire terminal is pressed against the connection terminal plate.

This is a so-called screw fastening.

The terminal screws are usually tightly tightened, but
Sometimes, if it is not tightened enough or if it becomes loose, the resistance value at the connection point increases due to a decrease in the contact area, causing the temperature to rise when current flows, and the current flow is reduced. When it stops, the heat cycle phenomenon in which the temperature drops begins to repeat. This phenomenon often leads to further loosening of the terminal screws.

Traditionally, spring washers have been used to prevent loosening, but
If the connection was not sufficient and there was significant slack, there was a risk that the connection would generate a lot of heat and cause a fire.

[Purpose of the invention]

In view of the above circumstances, an object of the present invention is to provide an electric wire fastening structure that can prevent high temperatures due to loosening of terminal screws and improve safety.

[Disclosure of the invention]

In order to achieve the above object, the present invention provides two overlapping locking washers that are screwed together so as to press the wire conductor portion toward the connected member, thereby preventing the electric wire from being electrically connected to the connected member. In the wire fastening structure where the connection is made, the washer that does not directly contact the wire conductor portion is formed of a shape memory alloy and comes into direct contact with the wire conductor portion when the washer temperature exceeds a certain temperature in a slack state. The gist of the present invention is an electric wire fastening structure characterized in that the electric wire is subjected to shape memory treatment so as to be deformed into a shape that presses the electric wire conductor portion through the washer on the other side.

The present invention will be described in detail below with reference to the drawings showing one embodiment thereof.

1 to 3 show an example of an electric wire fastening structure according to the present invention. A screw insertion hole 2 is formed in a conductive connection terminal plate (connected member) (2) that is attached to a wiring device. The terminal threaded screw 3 includes a screw head 4 and a screw shaft 5, and the screw head 4 has a cross recess 7 with a groove 6, as shown in FIG. 1(b). A threaded portion 5 a that is screwed into the screw insertion hole 2 is formed on the outer periphery of the screw shaft portion 5 . On the back side of the screw head 4, there is a first
As shown in Figures (a) and (C), two locking washers, a first washer 9 and a second washer 10, are provided in an overlapping state. The first washer 9 is placed on the upper side, and the second washer 10 is placed on the lower side, which is the connection terminal plate 1 side, and the wire end portion (wire conductor portion) 1) is placed between the second washer 10 and the connection terminal plate 1. I'm caught in the middle. The first washer 9, which is not in direct contact with the wire end 1), is made of a shape memory alloy material and is normally in a flat state as shown in Figure 1(a), but at a temperature above a specific transformation temperature As. When it reaches a high temperature, it deforms into a waveform that rises and falls in the circumferential direction, as shown in Figure 3.

The second washer 10 that is in direct contact with the wire end 1) is always flat, and the wire end 1) is connected to the connecting terminal plate 1 together with the first washer 9.
It is screwed down to hold it down.

Next, the function of the first washer 9 will be explained. Said first,
The terminal screw 3 with the second washer 9 and 10 is adapted to be screwed into the connection terminal plate 1, and by being screwed in, the wire end portion 1) is sandwiched between the second washer 10 and the connection terminal plate 1. In other words, an electrical connection is made by pressing the wire end 1) against the connection terminal plate 1.
As shown in FIG. 3, the terminal screw 3 becomes loose with use, and the connecting portion generates strong heat, and when the first washer 9 reaches a high temperature (above the transformation temperature As), it deforms into a wave shape. When transformed, the first
Washer 9 presses against second washer 10. Since the second washer 10 remains flat, the entire wire end 1) is connected to the connecting terminal plate 1.
be forced to. Therefore, the contact area between the connection terminal plate 1 and the wire end portion 1) increases. This prevents the resistance at the contact point from increasing, allowing the current to flow normally and preventing the temperature rise at the connection point. Particularly, as in this embodiment, when the end of the wire is stripped and the exposed copper wire is wrapped around the terminal screw, the slack can easily be removed, so the first washer 9 is particularly effective.

This invention is not limited to the above embodiments. For example, it goes without saying that the electric wire end portion 1) includes one in which the end portion is not a bare copper wire but has a caulked terminal or the like attached thereto. The shape of the washer eye body may not be flat in its normal state, but may be in the shape of a so-called spring washer. The shape of the first washer 9 when deformed may also be shaped into an umbrella shape. Furthermore, the connection terminal board itself may be threaded, or the connection terminal board may be a simple through-hole without threads, and the screw hole may be provided in a member below the connection terminal board.

〔Effect of the invention〕

As seen above, in the electric wire fastening structure according to the present invention, the two overlapping locking washers are screwed so as to press the electric wire conductor toward the connected member. In a structure in which an electrical connection is made to
The washer that is not in direct contact with the wire conductor is made of a shape memory alloy, and when the washer temperature reaches a certain temperature or higher in a slack state, the wire conductor is moved through the washer that is in direct contact with the wire conductor. Since the terminal is configured to undergo shape memory treatment so that it deforms into a shape that presses the terminal, it is possible to prevent the terminal screw from becoming too hot due to loosening, thereby improving safety.

[Brief explanation of drawings]

FIGS. 1(al), (b), and (C) show an example of the wire fastening structure according to the present invention, and FIG. 1(a) shows
Its half-sectional view, the same figure (bl is its plan view, the same figure (C)
2 is an exploded perspective view thereof, and FIG. 3 is a half-box sectional view for explaining the operation. 1... Connection terminal plate 3... Terminal screw 4... Screw head 5... Screw shaft portion 9... Washer 10.
...Washer 1) ...Wire end agent Patent attorney Takeshi Matsumoto Sound use 1 diagram (b) Usage 5 kenneili official book (self 0 1, case display ■zf mouth 61ri ``4 Breasts'fl!1) @ 1 2 0 6
6 No. 9 No. 2, Title of the invention: Wire fastener 3, Relationship with the case of the person making the amendment Patent applicant Address: 1048 Kadoma, Kadoma City, Osaka Name (583) Matsushita Electric Works Co., Ltd. Representative IU Uso Role: Sadao Fujii 4, Agent Special Application No. 120669/1986 6. Specification subject to amendment 7, Contents of amendment ■ The title of the invention "Electric wire fastening structure" in the third line of page 1 of the specification is corrected to "Wire fastening screw." ■ The entire text of the scope of claims column of the specification is corrected as follows. 1. (1) In the two ground washers that are twisted together, the washer that is not in direct contact with the wire conductor is made of a shape memory alloy and is in a relaxed state. An electric wire stopper characterized by being subjected to shape memory treatment so that when the washer temperature reaches a certain level, the electric wire conductor section is deformed into a shape that presses the electric wire conductor section through the washer that is in direct contact with the electric wire conductor section. ■ ``Electric wire stop structure'' in four locations: line 17 on page 1, line 18 on page 2, lines 14 to 15 on page 3, and lines 5 to 6 on page 7 of the specification. The statement has been corrected to read, "It's for holding wires." ■ 81) In Book I, page 3, lines 1 to 1), the statement ``In order to achieve the above purpose...this is the summary.'' should be corrected as follows. Ichiki-ichi

Claims (1)

[Claims] (1) In an electric wire fastening structure in which two overlapping locking washers are screwed together so as to press the electric wire conductor toward the connected member, thereby electrically connecting the electric wire to the connected member. , the washer that is not in direct contact with the wire conductor is formed of a shape memory alloy, and when the washer temperature reaches a certain temperature or higher in a slack state, the wire is moved through the washer that is in direct contact with the wire conductor. A wire stopper structure characterized by being subjected to shape memory treatment so that it deforms into a shape that presses a conductor part.