JPS6231957Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for fixing a cover at the rear end of a yoke in an electromagnetic switch.

Conventionally, as this type of device, for example, Fig. 1 and Fig. 2
As shown in the figure, a step b is attached to the rear end of the yoke a to form a large-diameter portion c, and an end plate d, a gasket e, and a cover f that is prevented from rotating on the end plate are sequentially fitted into this. At the same time, a type is known in which the cover f is fixed by caulking the remaining ends g extending rearward of the yoke a inward, but in this case, the remaining ends g are separated from each other as shown in FIG. This is the partial caulking of the left and right two parts, which causes the cover f
Generally, the yoke is fixed by caulking and is prevented from rotating, but such a method does not always provide good rotation prevention, tends to cause relatively large distortion in the yoke, and also causes local damage to the cover. This is accompanied by inconveniences such as the possibility of damage due to a sudden hit.

The purpose of the present invention is to obtain a device free of such inconveniences, and a step 5 is provided at the end of a frame-like yoke 4 that accommodates a coil bobbin 3, and a large-diameter thin-walled portion 6 is provided. The end plate 7 and the cover 9 are sequentially fitted to the thin part 6, and the thin part 6 is
In the case where the cover 9 is fixed to the end of the yoke 4 by caulking the remaining end 10 to the outer periphery of the open end of the cover 9, the axial direction engages with the joint surface of the end plate 7 and the cover 9 to prevent rotation. A concave portion 17 and a convex portion 18 are provided, and a convex portion 11 is formed on the outer periphery of the surface opposite to the joint surface of the end plate 9, and a concave portion 12 that is rotationally engaged with the convex portion 11 is provided in the thin wall portion 6. It is characterized by being formed.

FIGS. 3 to 5 show one example of this, and the center of the yoke 4 has a movable contact plate 14 at its tail end facing the terminal contacts 13, 13 extending forward from the cover 9. The iron core 15 is provided so as to be able to freely move backward against the return spring 16 as the coil 2 is energized. The convex portion 11 is in the shape of a split piece, as clearly shown in FIG. The remaining end 10 is configured in the shape of a continuous annular flange, as clearly shown in FIG. Also end plate 7
The cover 9 is the convex portion 18 of the extruded end plate 7 and the concave portion 1 of the cover 9 provided during resin molding.
7 and are engaged with each other to prevent rotation.

Note that 1 in the figure is a yoke plate that constitutes a magnetic path, and the yoke 4 may also serve as this. Also, 8
is a rubber gasket that prevents foreign objects, especially water, from entering the electromagnetic switch.

In this way, according to the present invention, the end plate 7 and the cover 9 that are fitted into the thin walled part 6 at the end of the yoke 4 have a concave part 17 and a convex part 18 in the axial direction that are rotationally engaged with their joint surfaces. Since the end plate 7 and the cover 9 can be easily engaged with each other without rotation, the end plate 7 has a convex portion 11 formed on the outer periphery of the surface opposite to the joint surface.
Since the yoke 4, the end plate 7, and the cover 9 are engaged with the recess 12 formed in the thin-walled portion 6 without turning, the yoke 4, the end plate 7, and the cover 9 are easily engaged with the remaining end 10 of the thin-walled portion 6 and positioned. The remaining end 10 can be crimped without requiring a jig for positioning, etc., making the assembly work simple, and since there is no need to swage the remaining end 10 around, it is easy to automate the crimping. It has the following effects.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the conventional example, Figure 3 is a cross-sectional side view of an example of the device of the present invention, Figure 4 is a rear view thereof, and Figure 5 is an enlarged sectional view taken along the - line. be. 1... Yoke plate, 2... Coil, 3...
Coil bobbin, 4...yoke, 5...stage, 6...
Thin wall part, 7... End plate, 8... Gasket, 9... Cover, 10... Remaining end, 11... Convex part,
12... Concavity.

Claims (1)

[Scope of utility model registration request] At the end of the frame-like yoke 4 that accommodates the coil bobbin 3, a step 5 is formed to form a large-diameter thin section 6.
An end plate 7 and a cover 9 are sequentially fitted into the thin part 6, and the remaining end 10 of the thin part 6 is caulked to the outer periphery of the open end of the cover 9 to fix the cover 9 to the end of the yoke 4. , an axial concave portion 17 and a convex portion 18 are provided on the joint surface of the end plate 7 and the cover 9 to prevent rotation, and a convex portion is provided on the outer periphery of the surface opposite to the joint surface of the end plate 9. 11, and a concave portion 12 that engages with the convex portion 11 in a rotation-preventing manner is formed in the thin portion 6.