JPS597711Y2 - Lead wire extraction structure of reed switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lead wire extraction structure for a glass-sealed reed switch such as a temperature-sensitive reed switch.

The main body of a reed switch incorporated into a temperature-sensitive reed switch or the like is usually sealed with glass, but this glass seal is extremely brittle and easily damaged by bending, pulling, twisting, or other stress on the lead wire.

For this reason, special consideration is required in handling, and it is desirable that the lead wire lead-out structure is designed so as not to apply undue stress to the glass seal portion.

FIGS. 1 and 2 show a lead wire drawing structure of a conventional temperature-sensitive reed switch in consideration of the above points.

In FIG. 1, a magnetic body 2 made of a combination of a temperature-sensitive ferrite and a magnet is provided around a reed switch body 1, and a lead wire 3 is drawn out from a glass seal portion of the reed switch body 1.

The lead wire 3 is supported by an insulating holder 4 provided at both ends of the magnetic body 2.

The outer circumferences of the magnetic body 2 and the holder 4 are further covered with a metal case 5.

Such a structure prevents the bending stress of the lead wire 3 from being directly applied to the glass seal portion of the reed switch body 1.

On the other hand, in the structure shown in FIG. 2, a stranded extension lead wire 10 is connected to the lead wire 3 from the reed switch main body 1 by soldering or crimping, and the extension lead wire 1 is connected to the holder 4 by soldering or crimping.
It supports 0.

Note that the magnetic body 2 and case 5 are provided in the same manner as in FIG.

According to this structure, twisted wires are used in the extension lead wire 10 to absorb stress caused by bending.

By the way, although the conventional structure described above is effective against bending of the lead wire, it has the disadvantage that stress is directly applied to the glass seal etc. when the lead wire is twisted, and it cannot fulfill its protective function. There is.

The present invention eliminates the above-mentioned drawbacks and provides a lead wire pull-out structure for a reed switch that prevents stress such as twisting of the lead wires from being directly applied to the glass seal portion of the reed switch body, thereby preventing damage to the glass seal portion. This is what I am trying to do.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a lead wire drawing structure for a reed switch according to the present invention will be described with reference to the drawings.

3 and 4 show a first embodiment.

In these figures, the lead wire 3 of the reed switch body 1 is provided with a bent portion 20, and a locking groove 21 is formed on the inner periphery of the insulating holder 4A provided on both ends of the magnetic body 2. .

This locking groove 21 is a notched recess formed from the inner peripheral surface of the holder 4A toward the outer peripheral side, and extends from one end surface of the holder 4A in the axial direction of the holder.

Then, the lead wire 3 is locked in the locking groove 21 at the bent portion 20 within the holder 4A, and is pulled out to the outside.

Note that the outer circumferences of the magnetic body 2 and the holder 4A are covered with a metal case 5.

According to this first embodiment, the bent portion 20 is locked in the locking groove 21 and acts as a stopper against twisting of the lead wire 3, and the tensile stress of the lead wire 3 can also be absorbed by the bent portion 20. Breakage of the glass seal portion of the reed switch body 1 can be reliably prevented.

5 to 7 show a second embodiment.

In these figures, a locking piece 30 is bonded to the lead wire 3 of the reed switch body 1 by soldering or the like instead of providing a bent portion.

Then, the lead wire 3 is connected to the holder 4 through the locking piece 30.
B is locked in the locking groove 21 on the inner circumference and pulled out to the outside.

The other parts have the same structure as the first embodiment.

According to this second embodiment, since the locking piece 30 acts as a stopper against twisting of the lead wire 3, the glass seal portion of the reed switch body 1 can be protected from damage due to torsional stress.

8 to 10 show a third embodiment.

In these figures, the lead wire 3 of the reed switch body 1 is connected to a twisted wire extension lead wire 10 via a connecting terminal 40.

As shown in detail in FIG. 10, the connecting terminal 40 includes a plate-shaped locking part 41 and connecting parts 42 formed in a half-cylindrical shape provided on both sides of the plate-shaped locking part 41.

Then, the extension lead wire 10 and the lead wire 3 are inserted into the connecting portion 42 and connected by soldering or crimping.

On the other hand, a locking groove 21 is formed on the inner circumference of the holder 40, and the locking groove 21 locks and supports the locking portion 41 of the connection terminal 40.

According to this third embodiment, since the connecting terminal 40 acts as a stopper against twisting of the extension lead wire 10, it is possible to protect the glass seal portion from damage due to torsional stress.

In addition, as a connection terminal, a locking portion 41A as shown in FIG.
Using a connecting terminal 40A with a connecting part 42A on one side,
The lead wire 3 and the extension node wire 10 may be fixed at the connecting portion 42A.

Furthermore, soldering, welding, etc. may be performed on the locking portion 41A.

12 to 14 show a fourth embodiment.

In these figures, the lead wire 3 of the reed switch body 1 is connected to the stranded extended lead wire 10 via a spring crimp type connection terminal 50.

As shown in FIG. 14, the spring-type connecting terminal 50 consists of a spring-type crimp part 51 and a half-cylindrical connecting part 52 provided on one side thereof.

The lead wire 3 and the extension lead wire 10 are connected to each other by inserting the lead wire 3 into the spring-type crimping portion 51 and crimping or soldering the extension lead wire 10 to the connection portion 52.

On the other hand, a locking groove 21A is formed in the holder 4D, and the spring crimp type connection terminal 50 is locked and supported by this locking groove.

According to this fourth embodiment, since the spring crimp type connection terminal 50 acts as a stopper against twisting of the extension lead wire 10, it is possible to prevent twisting stress from being applied to the glass seal portion.

Moreover, since the lead wire 3 of the reed switch main body 1 and the spring crimp type connection terminal 50 are electrically connected by spring pressure, a sufficient effect is exerted against the tensile stress of the extension lead wire 10.

In each of the above embodiments, a reed switch in which a magnetic material 2 such as a temperature-sensitive ferrite or a magnet is provided on the outer periphery of the reed switch body 1 was explained as an example, but the holder protects the glass seal portion of the reed switch body 1. Any structure designed to achieve this can be similarly applied.

As described above, the present invention provides a lead wire pull-out structure for a reed switch that can protect the glass seal portion of the reed switch body by preventing stresses such as twisting of the lead wires from being directly applied to the glass seal portion of the reed switch body. Obtainable.

[Brief explanation of drawings]

Figure 1 shows the lead wire extraction structure of a conventional reed switch.
FIG. 2 is a vertical cross-sectional view showing another example of a conventional reed switch lead wire extraction structure, and FIG. 3 is a first embodiment of a reed switch node wire extraction structure according to the present invention. FIG. 4 is a vertical cross-sectional view showing the second embodiment, FIG. 5 is a vertical cross-sectional view showing the second embodiment, FIG. 6 is a VI-VI cross-sectional view, and FIG. 7 is an enlarged view of main parts. The perspective view shown in Fig. 8 is the third
FIG. 9 is a longitudinal sectional view showing the embodiment, FIG. 9 is an IX-IX sectional view, FIG. 10 is a perspective view showing an enlarged connection terminal portion used in the third embodiment, and FIG. FIG. 12 is a perspective view showing an example; FIG. 12 is a vertical sectional view showing the fourth embodiment; FIG.
The figure is a cross-sectional view taken along line XIII-XnI, and FIG. 14 is a perspective view showing an enlarged main part. 1...Reed switch body, 3...Lead wire, 4, 4A, 4B, 4C, 4D...Holder, 10...Extension lead wire, 20・・・・・・
・Bending part, 21.21A...Latching groove, 30...
...Latching piece, 40.40A... Connection terminal,
50... Spring crimp type connection terminal.

Claims (1)

[Scope of utility model registration request] In a lead wire drawing structure for a reed switch in which a holder supports a lead wire drawn out from a glass-sealed reed switch body or an extension lead wire connected to this lead wire via a connecting member, the outer periphery is lower than the inner peripheral surface of the holder. A locking groove formed of four notches shaped toward the side and extending in the axial direction of the holder from one end surface of the holder is provided on the inner circumference of the holder, and a bent groove is provided in the middle of the lead wire. A lead wire drawing structure for a reed switch, characterized in that the locking piece or the connecting member is locked in the locking groove.