JPS6133609Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic coil for use in relays, timers, etc., and its purpose is to provide an electromagnetic coil that is easy to manufacture.

Generally, the wire that is wound around the coil is of a small diameter, and since the wire is soldered to the terminal for conductive connection, the wire at the beginning and end of the coil should be twisted once at the folded end. Therefore, each wire end is made as rigid as possible, and the wire is connected by soldering in such a way that the wrapped portion around the terminal is difficult to loosen.

Such conventional electromagnetic coils require twisting work at the ends of the wires, making automation difficult and cumbersome to manufacture.

The present invention has been made in view of these conventional drawbacks and to improve them.

Embodiments of the electromagnetic coil of the present invention will be described below with reference to the drawings.

The bobbin has rectangular flanges 2 fixed to both ends of the body 1 by plastic molding of synthetic resin, and a pair of protrusions 3 having a square cross section on one side of the periphery of each flanges 2. , 4 are arranged in parallel. A terminal 5 is inserted through one of the protrusions 4, and one end of the terminal 5 protrudes from the tip surface of the protrusion 4. An electric wire 6 is wound around the body 1 of the bobbin, and the end of the electric wire 6 is hooked around the first protrusion 3 where the terminal 5 is not provided, and then the second protrusion 3 where the terminal 5 is provided. The electric wire 6 is wound multiple times from around the protrusion 4 to the terminal 5, and the direction in which the electric wire 6 is wound around the first protrusion 3 and around the second protrusion 4 is opposite. . After being wound around the terminal 5 in this manner, the wire 6 is conductively connected to the terminal by welding.

With the above configuration, the electric wire 6 is hung around both protrusions 3 and 4 in a so-called "crossing" manner, and the tension of the electric wire 6 is prevented by both protrusions 3 and 4. As a result, a small diameter electric wire 6
This also makes it difficult for loosening to occur when using. In order to explain this principle, as a comparison with the present invention, after hooking the electric wire 6 to the first protrusion 3, the electric wire 6 is hooked to the second protrusion 4 in the same direction as the first protrusion 3. Considering the case where the electric wire 6 is hung around, in the present invention and the comparative example, the electric wire 6 is pulled out in a direction perpendicular to the direction that connects both the protrusions 3 and 4 before and after being hooked on both the protrusions 3 and 4. shall be. Considering this, in the present invention, the electric wire 6 is bent at an acute angle around one protrusion 3, 4, and in the comparative example, the electric wire 6 is bent at an approximately right angle around one protrusion 3, 4. will be done. Therefore, the pressing force acting on the protrusions 3 and 4 based on the tension acting on the electric wire 6 is clearly larger in the present invention, and the pressure on the protrusions 3 and 4 and the electric wire 6
Considering that the frictional force acting between the protrusions 3,
4 and the electric wire 6 is large. Furthermore, since the protrusions 3 and 4 have a rectangular cross-sectional shape,
In the case of the present invention, both protrusions 3 and 4 are combined and the electric wire 6
is bent at four corners, whereas in the case of the comparative example, even if both protrusions 3 and 4 are combined, the electric wire 6 is only bent at two corners. Generally, it is difficult for the tension of the wire 6 to be transmitted on both sides of the corner, so naturally the more times the wire is bent at the corner, the higher the tension-stopping effect is.From this point of view as well, the present invention is better than the comparative example. It can be seen that the tension stopper is highly effective. As described above, by tying the wire 6 around the pair of protrusions 3 and 4, the tension-stopping effect of the wire 6 is enhanced, and the wire 6 wrapped around the body 1 is The tension is not transmitted to the end of the wire 6 wound around the terminal 5, and the wire 6 is difficult to loosen.
This makes the welding work to the terminal 5 easier. Furthermore, since welding such as spot welding is performed instead of soldering, there is no problem with the contacts due to flux adhesion. Furthermore, since the terminal 5 is erected on the tip surface of the protrusion 4 for tension stop, the wire 6 can be wound coaxially, making the work of winding the wire 6 easier. This makes automation easy.

As described above, in the present invention, a plurality of protrusions 3 and 4 having a rectangular cross section are provided on the periphery of the flange 2 of the bobbin, which has a shape in which the flat flange 2 is fixed to the end of the body 1 on which the electric wire 6 is wound. Terminals 5 are arranged in parallel and erect on the tip surface of one of the protrusions 4, and the end of the electric wire 6 wound around the bobbin is hooked around the other protrusion 3 and then attached to that protrusion. It is wound several times from around the protrusion 4 on which the terminal 5 is provided to around the terminal 5 in the opposite direction to the circumference of the part 3, and the tip of the electric wire 6 is welded to the terminal 5, thereby forming the electric wire 6 and the terminal 5. The wires 6 are electrically connected to each other, and the wires 6 are hung around the rectangular protrusions 3 and 4 in opposite directions, so that the wires 6 are not tensioned by the protrusions 3 and 4 for the reason mentioned above. Therefore, displacement of the electric wire 6 can be prevented. Therefore, wire ends can be connected without folding or twisting the winding ends as in the past.
It is possible to provide an electromagnetic coil that can be easily manufactured.

[Brief explanation of the drawing]

The drawing is a perspective view showing an embodiment of the electromagnetic coil of the present invention. 1...Body part, 2...Brim part, 3, 4...Protrusion part, 5
...Terminal, 6...Wire.

Claims (1)

[Scope of utility model registration request] A plurality of protrusions each having a rectangular cross section are arranged in parallel on the periphery of the flange of the bobbin, which has a flat plate-like flange fixed to the end of the body on which the electric wire is wound, and a terminal is attached to the tip end surface of each protrusion. around a protrusion where a terminal is provided so that the end of the wire wound around the bobbin is hooked around another protrusion and then rotates in the opposite direction to the circumference of that protrusion. An electromagnetic coil is made by winding the wire multiple times around the terminal, and the tip of the wire is welded to the terminal to electrically connect the wire and the terminal.