JPH0135400Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reed switch, and more particularly, to a reed switch that is easy to assemble and can be assembled automatically.

FIG. 1 is a perspective view of a coil bobbin used in a conventional reed switch, and FIG. 2 is a cutaway side view of the reed switch. The coil bobbin 1 is molded from synthetic resin and includes a coil winding part 2 and outward flange parts 3, 3 provided on both sides of the coil winding part 2. The coil winding portion 2 has a bottom portion 4 and side wall portions 5 erected from both sides of the bottom portion 4, respectively, and has a groove shape with an open upper portion. 1st
As shown in the figure, the flange portion 3 also has a notch 6 opened upward in accordance with this groove shape.

As shown in FIG. 2, a contact piece carrier 7 is inserted inside the coil winding part 2, and is fixed to the coil bobbin 1 with an adhesive 8. This piece carrier 7
is composed of an insulating tube 9 made of a glass tube or the like, and two rod-shaped conductive contact pieces 10a and 10b. The contact pieces 10a and 10b are inserted from both sides of the insulating tube 9, and held by the insulating tube 9 with one end facing each other with a predetermined gap in between. 9 protrudes horizontally from both sides by a predetermined length.
And in the coil winding part 2 of this coil bobbin 1,
A reed switch is constructed by winding the excitation coil 11 with a predetermined number of turns.

When assembling the reed switch, there is also a method of first winding the excitation coil 11 around the coil bobbin 1, then inserting the contact piece carrier 7 into the hollow part of the coil bobbin 1 and fixing it with the adhesive 8. Furthermore, there is also a method of fixing the contact piece carrier 7 by providing terminals on the flange portions 3, 3 and soldering the terminals to the conductive contact pieces 10a, 10b.

However, in the conventional reed switch, the contact piece carrier 7 is positioned and fixed to the coil bobbin 1 using adhesive 8 or soldering as described above, which makes workability poor and automatic assembly difficult.

In addition, this invention was previously disclosed in Japanese Utility Model Application Publication No. 59-132137, in which two convex portions were provided inside the relay cover and two concave portions were provided in the coil spool, and by fitting the pair of concave and convex portions, the reed switch was Reed relays have been proposed in which lead terminals are sandwiched and fixed by bending.

However, this structure does not allow for proper positioning of the reed switch within the coil spool.
The reed switch often becomes uneven within the coil spool. If the reed switch is misaligned in this manner, when the relay cover is fitted onto the coil spool, the convex lower end of the relay cover collides with the base of the lead terminal of the reed switch. As is well known, the insulating tube of a reed switch is made of a thin glass tube, and the lead terminal is held in it.
When the protrusion collides with the base of the lead terminal, the insulating tube is destroyed, resulting in a defective product, which has the drawback of poor production yield.

An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a reed switch that is easy to assemble.

To achieve this objective, the present invention consists of two conductive contacts and an insulating tube holding the contacts with one end facing each other, the other end of the contact being on either side of the insulating tube. It is equipped with a contact piece carrier that protrudes a predetermined length from each other, and a coil bobbin in which the contact piece carrier is inserted into a hollow part and an excitation coil is wound around the outer periphery, and the conductivity is determined depending on whether or not the excitation coil is energized. The object is a reed switch in which the ends of the contact pieces move toward and away from each other.

The coil bobbin is provided with a coil winding portion into which the armature carrier can be inserted, and one conductive armature of the armature carrier can be inserted through one end of the coil winding region, but the insulating tube cannot pass through. A positioning portion having a small hole is provided.

inserting a contact piece carrier inside the coil winding portion and inserting one conductive contact piece into the small hole;
The conductive contact piece is positioned at a position where the base of the insulating tube does not protrude outward from the small hole, and both ends of the conductive contact piece protruding from both sides of the bobbin are aligned with the insertion direction of the contact piece carrier. The coil bobbin is bent in substantially perpendicular directions, grooves are provided on both sides of the coil bobbin, the bent portions of the conductive contact piece are fitted into the coil bobbin, and protrusions provided on both inner sides of the case for protecting the reed switch are fitted into the grooves. The conductive contact piece is fixed by doing this.

Next, an embodiment of the present invention will be described with reference to FIGS. 3 and 4.

3 and 4 are a cutaway side view and a bottom view of the reed switch.

Coil bobbin 12 on which excitation coil 11 is wound
is molded from synthetic resin, and has a cylindrical coil winding part 13 in the middle part, an outwardly facing first flange part 14 at one end, and an outwardly facing second flange part 15 at the other end. is formed. The size of the hollow portion of the coil winding portion 13 is designed to allow insertion of the armature carrier 7, and a positioning portion 16 is provided at a position near the first flange portion 14 in the intermediate portion thereof. This positioning portion 16 is formed with a small hole 17 through which one of the conductive contacts 10a of the contact piece carrier 7 can be inserted, and this small hole 17 has a size such that the insulating tube 9 does not pass therethrough. The inner surface of the positioning portion 16 is curved along the shape of the end of the insulating tube 9.

At the center of the first flange part 14, a first flange part 14 is provided which communicates with the small hole 17 of the positioning part 16 and extends in the vertical direction.
A groove portion 18 is provided. Further, two terminal insertion holes 19 are formed at a predetermined interval from the upper surface of the second flange portion 15 toward the lower surface thereof. The coil terminals 22 are inserted and fixed into the terminal insertion holes 19, respectively. Second flange part 1
5 also has a second groove portion 21 similar to the first flange portion 14.
is formed.

The case 23 is for protecting the excitation coil 11, and has a flange-like protrusion 23 fitted into the first and second grooves 18, 21 inside the case 23.
a, 23b are formed, and this protrusion 23
The conductive contact pieces 10a and 10b are fixed at points a and 23b.

Next, the assembly procedure of the reed switch according to the present invention will be explained.

The excitation coil 11 is wound around the coil winding portion 13 of the coil bobbin 12 by a predetermined number of turns, and both ends of the excitation coil 11 are wound around the coil terminals 22 and fixed with solder. After that, the conductive contact piece 10
The armature carrier 7, which is made straight with the insulating tube 9 with a and 10b horizontal, is inserted into the hollow part of the coil winding part 13 from the second flange part 15 side of the coil bobbin 12. Then, one conductive contact piece 10a is inserted into the small hole 17, and the contact piece 10a is inserted into the first flange portion 14.
from the insulating tube 9, and place one end of the insulating tube 9 in the positioning section 16.
The contact piece carrier 7 is positioned within the coil bobbin 12 by making contact with the coil bobbin 12 . After that, conductive contact pieces 10 are respectively protruded from both sides of the coil bobbin 12.
a and 10b downward, and the bent end of the conductive contact piece 10a is fitted into the first groove 18 of the first flange part 14, while the bent end of the conductive contact piece 10b is inserted into the second flange part 15. It fits into the second groove part 21 of. Then, the case 23 is
a, 23b are fitted onto the coil bobbin 12 while fitting into the first and second grooves 18, 21. This prevents movement of the armature carrier 7 in the axial and circumferential directions, thereby fixing the armature carrier 7.

In the embodiment described above, the armature carrier 7 is inserted after the excitation coil 11 is wound around the coil bobbin 12, but the armature carrier 7 can also be positioned and fixed on the coil bobbin 12 before the excitation coil 11 is wound.

The present invention has the above-described configuration, and the contact piece carrier can be easily positioned and fixed within the coil bobbin, and automatic assembly is possible, thereby improving work efficiency.

In addition, as in the embodiment, grooves are formed in both flanges of the coil bobbin into which the bent ends of the conductive contact pieces are respectively inserted. The armature carrier can be reliably fixed by the simple operation of attaching the case.

Furthermore, in the present invention, since the contact piece carrier is held in an appropriate position by the positioning part provided on the coil bobbin, the protruding part of the contact piece carrier will not collide with the base of the conductive contact piece when the case is fitted. can be prevented. Therefore, the insulating tube is not destroyed, and the yield can be improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a coil bobbin used in a conventional reed switch, Fig. 2 is a cutaway side view of the reed switch, and Figs. 3 and 4 illustrate a reed switch according to an embodiment of the present invention. Figure 3 is a cutaway side view of the reed switch.
FIG. 4 is a bottom view of the reed switch. 7... Contact piece carrier, 9... Insulating tube, 10a, 10
b... Conductive contact piece, 11... Excitation coil, 12...
...Coil bobbin, 13...Coil winding section, 14...
...First flange part, 15... Second flange part, 1
6...Positioning part, 17...Small hole, 18...First
Groove portion, 21...Second groove portion, 22...Coil terminal,
23...Case, 23a, 23b...Flange-like protrusion.

Claims (1)

[Claims for Utility Model Registration] Consisting of two conductive contact pieces and an insulated tube that holds the contact pieces with one end facing each other, the other end of the contact piece is held from both sides of the insulated tube, respectively. It comprises a contact piece carrier protruding by a predetermined length, and a coil bobbin in which the contact piece carrier is inserted into a hollow part and an excitation coil is wound around the outer periphery, and the conductive contact is activated depending on whether or not the excitation coil is energized. In a reed switch in which the end portions of the pieces move toward and away from each other, the coil bobbin is provided with a coil winding portion into which the armature carrier can be inserted, and one end of the coil winding portion is provided with one of the armature carriers. A positioning part having a small hole through which a conductive contact piece can be inserted but not an insulating tube is provided, a contact piece carrier is inserted inside the coil winding part, and one conductive contact piece is inserted into the small hole. At least, the conductive contact piece is positioned at a position where the base of the insulating tube does not protrude outward from the small hole, and both ends of the conductive contact piece protruding from both sides of the coil bobbin are respectively positioned on the contact piece carrier. The coil bobbin is bent in a direction substantially perpendicular to the insertion direction, grooves are provided on both sides of the coil bobbin, and the bent portions of the conductive contact piece are fitted into the coil bobbin. A reed switch characterized in that the conductive contact piece is fixed by fitting into a groove.