JPH0443946Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a magnetic proximity switch, and particularly to a fixing structure for a reed switch built into the magnetic proximity switch.

(b) Summary of the invention The present invention provides a magnetic proximity switch in which a holding part for holding a reed switch body and a lead wire can be housed in a casing formed by fitting a case to a base, and the case is fitted to the base. By providing a storage part that presses and holds the lead wire when the lead wires are fitted together, the reed switch can be easily and securely stored and fixed in the casing with high positioning accuracy.

(c) Technical technology and its problems Conventionally, magnetic proximity switches that have a built-in reed switch consisting of a reed switch body and a lead wire open and close the contacts using an external magnetic field.
Positioning the reed switch within the casing requires firmness and high positioning accuracy. For this reason, after the reed switch is housed in the casing, the reed switch is positioned by filling the casing with epoxy resin, urethane resin, or the like and solidifying it.

Moreover, since the resin agent flows out from the gap between the drawn out lead wire and the casing, it is necessary to close the gap in advance, which is time-consuming.

Furthermore, in the conventional example, the reed switch is likely to be misaligned during injection or curing of the resin, resulting in low positioning accuracy and a risk of variations in operating characteristics. For this reason, the reed switch body was temporarily fixed in advance with instant adhesive and then filled with resin, but this was time-consuming and problematic.

(d) Means for solving the problems In view of the above problems, the magnetic proximity switch according to the present invention has a reed switch main body and a lead electrically connected to the reed switch body in a casing formed by fitting a case to a base. A magnetic proximity switch that stores and fixes a reed switch consisting of a wire and pulls the lead wire out of the casing, the magnetic proximity switch having a holding part that holds the reed switch main body on the upper surface of the base, and a holding part that holds the lead wire. A storage section that can be stored is arranged in parallel, and the outer side surface of the storage section is formed with an elastic press-contact wall to which a lead wire can be temporarily fixed, and when the case is fitted to the base, the elastic press-contact wall The structure is such that the lead wire is pressed against the inner surface and deforms inward to hold the lead wire in pressure contact with the lead wire.

(e) Effect Therefore, according to the present invention, the reed switch main body is held by the holding part in the casing, and the lead wire is held by the fitting between the base and the case.
Since the reed switch is held in pressure contact within the housing via the elastic pressure contact wall, the reed switch is firmly fixed within the casing.

(f) Examples Examples of the present invention will be described below with reference to the attached drawings.

The first embodiment generally includes a base 1, a reed switch 10 consisting of a reed switch body 11 and lead wires 12a and 12b, and a case 20.

As shown in FIG. 3, the base 1 is provided with a partition wall 2 at the center in the longitudinal direction of its upper surface.

A pair of holding walls 3, 3 facing each other in the longitudinal direction are erected on one upper surface of the partitioned base 1 to hold a reed switch body 11, which will be described later.
The holding walls 3, 3 are provided with holding grooves 3a, 3b which are cut out and formed so that both ends 11a, 11b of the reed switch main body 11 can be press-fitted therein.

Further, the remaining upper surface of the partitioned base 1 is provided with a stepped portion 6 relative to the above-mentioned one upper surface, and the longitudinal side end portion thereof is opposite to the partition wall 2 and has an elastic structure. A pressure contact wall 4 is provided. This pressure contact wall 4 is provided with a large number of protrusions 4a on its inner surface that bite into lead wires 12a and 12b, which will be described later, to prevent them from coming off. Then, the lead wires 12a, 1
A storage groove 7 is formed to store the storage device 2b.

In addition, 8 communicates with the storage part 7, and the lead wire 12
A drawer portion 9 for pulling out a and 12b is an engaging protrusion.

The reed switch 10 includes a reed switch body 1
1, and lead wires 12a, 12b electrically connected to both ends 11a, 11b,
The lead wire 12a is appropriately bent so that it can be stored in the storage section 7 described above.

The case 20 can be fitted to the base 1 described above, and its inner surface has a shape that allows the pressing wall 4 to be pressed inward when the case 20 is fitted to the base 1. Furthermore, the case 20 has a drawer section 8 of the base 1.
In order to draw out the lead wires 12a and 12b, a draw-out portion 21 is formed by cutting out the lead wires 12a and 12b at a position corresponding to the
is provided. And 22 is a long hole for fixing.

Note that by appropriately selecting the width and depth of the drawer portions 8 and 21 provided on the base 1 and the case 20, the holding force for holding the lead wires 12a and 12b can be adjusted.

Next, the assembly method of this embodiment will be explained.

First, both ends 11 of the reed switch body 11
a, 11b are press-fitted into the holding grooves 3a, 3b of the holding walls 3, 3 to position and fix them, and the lead wires 1
2a and 12b are stored in the storage section 7. At this time,
The protrusion 4a of the pressure contact wall 4 and the lead wires 12a, 12b come into pressure contact, and the pressure contact wall 4 is slightly displaced outward, whereby the lead wires 12a, 12b are temporarily fixed.
Note that the ends of the lead wires 12a and 12b are connected to the storage part 7.
Pull it outward from the drawer section 8 that communicates with the.

Then, the base 1 and the case 20 are fitted together while pressing the pressure contact wall 4 inward with the inner surface of the case 20 from above the base 1, and the case 20 is fitted into the protrusion 9 of the base 1. , protrusion 9 of base 1
is fixed by engaging a recess (not shown) in the case 20. At this time, the protrusion 4a is connected to the lead wires 12a, 1
2b to prevent the lead wires 12a, 12b from coming off. For this reason, the lead wires 12a, 1
Even if a tensile force is applied to the reed switch 2b, the protrusion 4a prevents the lead wires 12a, 12b from coming off, which has the advantage of preventing wire breakage and damage to the reed switch body 11.

FIG. 5 shows a second embodiment.
In contrast, a ring portion 23 is provided at the inner corner of the case 20 to prevent it from coming off.
By deforming the upper end of the pressure contact wall 4 inward at this rounded portion 23, the lead wires 12a and 12b in the housing portion 7 are held in pressure contact between the partition wall 2 and the pressure contact wall 4. .

The rest is the same as the previous embodiment, so the explanation will be omitted.

Note that the lead wire is not limited to the above-mentioned structure, but may have another structure, and the holding portion and storage portion may be provided in the case.

Furthermore, if an instant adhesive is injected and solidified when both ends of the reed switch body are press-fitted into the holding grooves, the reed switch body can be held even more firmly.

(g) Effects As is clear from the above explanation, according to the present invention, the reed switch can be held within the casing consisting of the base and the case without using a resin, so it does not take much time to assemble. High productivity.

Moreover, since no resin is used, it can close the gaps. There is no need to temporarily attach the reed switch body with instant adhesive, so assembly is time-consuming.

Furthermore, since the reed switch body is press-fitted and fixed into the holding portion, high positioning accuracy can be obtained and variations in operating characteristics can be eliminated.

In addition, since the lead wires are temporarily fastened through the elastic pressure welding wall, the lead wire assembly work becomes easier and productivity is improved.The lead wires are temporarily fastened and do not move, so the lead switch body connected to the lead wires is temporarily fastened. This has the effect of ensuring high positioning accuracy without positional deviation.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, FIG. 1 is an exploded perspective view, FIG. 2 is a sectional view, FIG. 3 is a perspective view of the base, and FIG. 4 is a lead on the base. FIG. 5 is a perspective view of the switch installed, and a sectional view of the second embodiment of the present invention. 1...Base, 3...Retaining wall (holding part), 3a,
3b...Retaining groove, 7...Storage groove (storage section), 10
... Reed switch, 11 ... Reed switch body, 11a, 11b ... End part, 12a, 12b ...
...Lead wire, 20...Case, 21...Drawer part.

Claims (1)

[Claims for Utility Model Registration] A reed switch consisting of a reed switch body and a lead wire electrically connected to the reed switch body is housed and fixed in a casing formed by fitting a case to a base, and the lead wire is connected to the reed switch body. In a magnetic proximity switch that is pulled out from the casing, a holding part that holds the reed switch body and a storage part that can store the lead wire are juxtaposed on the upper surface of the base, and an outer side surface of the storage part is arranged side by side. It is formed of an elastic pressure wall that can temporarily hold the lead wire, and when the case is fitted to the base, the elastic pressure wall is pressed against the inner surface of the case and deforms inward to hold the lead wire in pressure contact. A magnetic proximity switch characterized by: