JPS6223056Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic contactor coil having a structure in which a connecting piece provided on a coil frame and an external terminal provided on an electromagnetic contactor case are brought into elastic contact and electrically connected.
In particular, it relates to improvements in connection pieces and connection piece attachment methods.

As shown in FIG. 8, a conventional coil terminal connecting device has a proximal end portion 9 having a convex portion 6 for connecting a coil wire 5.
and a contact portion 10 that makes elastic contact with the external terminal 4 and is electrically connected to the external terminal 4. As shown in FIG. 9, after inserting the base end 9 of the former conventional connection piece 3 into the hole 11 provided in the collar 2,
There is one in which the base end portion 9 is fixed with an adhesive 8.
In either case, when the electromagnetic contactor is assembled, transported, or during operation, the coil wire connected to the convex part at the base end of the connection piece will vibrate or be pulled, causing the coil wire to break due to vibration or shock caused by the connection piece. This is to prevent this. However, in the former case, the process of attaching the eyelet to the collar of the coil frame is complicated, and there is a risk that the coil wire may be disconnected or the collar may be damaged during the eyelet process. There was a risk that the external terminal and the connecting piece would not be electrically connected due to the contact area with the external terminal. In addition, both methods require many work steps when assembling the connecting piece, and require separate parts such as adhesives, which has the disadvantage of increasing the cost of the coil.

The purpose of this invention is to securely fix the connecting piece to the coil frame without using adhesives, prevent the coil wire from breaking during assembly, transportation, and operation, and facilitate assembly of the electromagnetic contactor coil. An object of the present invention is to provide an inexpensive coil terminal connection device for an electromagnetic contactor that can be used in a variety of ways.

In the present invention, a connecting piece is formed of an elastic metal plate, and a groove is integrally molded on the coil frame to elastically deform the connecting piece and prevent its return, and the connecting piece is moved using the returning force of the connecting piece. It is designed to be firmly fixed to the coil frame without any gaps.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. Reference numeral 11 denotes a coil frame having flanges 12, 12' on both sides and around which a coil wire 15 is wound. 1
Reference numeral 3 designates a connecting piece formed by molding a rectangular elastic metal plate into an S-shape having a notch 23 near one end.
A groove 24 into which the connection piece is inserted is provided near one end of the upper flange 12 of the coil frame 11. The groove 24 opens at the upper and side ends of the collar 12, and has a flat surface 29 that descends perpendicularly from the upper end, and an inclined surface 25 that widens the depth of the groove from the middle on the opposite surface. Further, a vertical groove 26 is provided in the center of this inclined surface 25. The resilient portion 22 having the notch 23 of the connecting piece 13 is inserted into the groove 24 and is resiliently fixed between the bottom surface 28 and the facing surface 29 of the inclined surface 25 . The coil wire 15 is connected by soldering or the like to the neck 20 of the notch 23 that protrudes from the upper end surface of the collar 12 of the coil frame 11, and the contact portion 20 extending upward from the collar 12 makes elastic contact with the external terminal 14. and connect electrically.

Next, the method of inserting the connecting piece 13 into the groove 24 and the principle of elastic fixation in the groove 24 will be explained. In FIG. 6, the elastic portion 22 of the connecting piece 13 is elastically deformed as shown and inserted into the groove 24 from the side or above of the groove 24. After that, when the external force causing the elastic deformation is removed, the elastic portion 22 tries to return to its original shape, but the bottom surface 28 of the groove 24 and the cutout cross section 27
At a position where the distance between the bottom surface 28 and the sloped surface 25 is equal, the sloped surface 25 and the cutout section 27 come into contact with each other, and the return of the elastic portion 22 is prevented. Also, since the dimensions l of the groove 24 and the notch 23 are set so that the opening angle θ of the elastic part 12 at this time is smaller than the original angle, the connecting piece 13 is
5 and the bottom surface 28 with no gap between them. Furthermore, even if a dimensional error occurs in the groove 24 or the notch 23, the structure is such that the inclined surface 25 and the notch section 27 come into contact with each other to prevent the resilient part 22 from returning. Although the opening angle θ increases or decreases, the connecting piece 13 is firmly fixed in the groove 24 and is prevented from coming off upward.

The width W of the fitting groove 26 provided in the groove 24 is slightly wider than the width ω of the neck portion 30 formed by the notch 23 of the connecting piece 13, and The elastic part 22 of the connecting piece 13 comes into contact with the
When the connecting piece 13 is assembled into the groove 24, the neck part 30 enters the fitting groove 26 and the connecting piece 13 moves in the side direction of the collar 12 of the coil frame 11. Prevents it from falling out.

According to this embodiment, it can be formed without separately providing a convex portion for connecting the coil wire, and since the connecting piece is simply formed from a strip-shaped elastic metal plate into an S-shape, the shape of the connecting piece is It is simple and has a good material yield when manufacturing connection pieces.

According to the present invention, the elastic part of the connecting piece is elastically fixed in the substantially U-shaped groove with an inclined surface provided in the brim of the coil frame without any gaps, so that it can be easily fixed during coil assembly, electromagnetic contactor assembly, and transportation. There is no rattling of the coil wire connection part of the connection piece due to vibration or impact during operation, and there is no risk of the coil wire breaking, and the connection piece can be attached with one touch without using separate parts such as grommets or adhesives. Therefore, it is possible to provide an inexpensive magnetic contactor coil that has a small number of parts and is easy to assemble.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the coil according to the embodiment of the present invention;
The figure is a perspective view of the main part of the coil frame collar of the same example,
The figure is a perspective view of the connection piece of the same example, Figure 4 is a front view of the main part of the coil of the same example, and Figure 5 is A-A in Figure 4.
A line sectional view, FIG. 6 is a front view of the main part of the coil frame while the connecting piece of the same embodiment is being inserted, and FIG. 7 is a line A-A in FIG. 6.
The line sectional view, FIGS. 8 and 9 are perspective views of main parts of a conventional coil. 11: Coil frame, 12, 12': Brim, 13:
Connection piece, 14: External terminal, 15: Coil wire, 2
0: Contact portion, 22: Pressure portion, 23: Notch, 2
4: groove, 25: inclined surface, 26: fitting groove, 27: cutout cross section, 28: bottom surface, 29: facing the inclined surface,
30: Neck.

Claims (1)

[Claims for Utility Model Registration] 1. In a coil for an electromagnetic contactor comprising a coil frame around which a coil wire is wound and a connecting piece provided on the brim of the coil frame, an opening is provided in the brim of the coil frame at its end face. A substantially U-shaped groove is provided, and this groove has a surface extending substantially perpendicularly from the end surface, and an inclined surface and a bottom surface opposite to this surface to widen the depth of the groove, and further, the contact piece is connected to the coil wire The connection portion has a U-shaped attachment portion to the coil frame and a contact portion with the external terminal, and the U-shaped attachment portion is fixed by force between the inclined surface of the groove, the surface facing the inclined surface, and the bottom surface. A coil terminal connecting device for an electromagnetic contactor, characterized in that the connecting piece is attached to the brim. 2. The connecting piece is formed by forming a strip-shaped plate having a notch near one end into an S-shape, and one U-shaped notch side of the S-shaped connecting piece is inserted into the groove. The coil wire is connected to a portion of the notch protruding from the upper surface of the coil frame, and the other side of the S-shaped connecting piece is brought into elastic contact with the external terminal. A coil terminal connection device for an electromagnetic contactor according to claim 1 of the utility model registration claim.