JPS6129154Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electromagnetic relay in which a yoke of an electromagnet and a fixed contact are fixed and integrated on a common base made of an insulating material.

Generally, as shown in Fig. 1, an electromagnetic relay has an electromagnet part consisting of an inverted L-shaped yoke 1, a coil 2, an iron core 3, an armature 4, and a movable contact X, and a fixed contact W part, which are constructed independently of each other. It is fixed to a base made of insulating material. The operation of this relay is such that when the armature 4 is attracted to the iron core 3, the armature pushes the movable contact attached to it and brings it into contact with the fixed contact. Therefore, the contact pressure and contact gap are influenced by the mutual positional relationship between the armature and the movable contact, that is, the magnitude of dimensional variation, and the positioning of the electromagnet part or fixed contact is directly related to the performance of the electromagnetic relay. .

However, in an electromagnetic relay having such a structure, the conventional method for fixing the yoke 1 and the insulating material base 5 is, for example, as shown in FIG. A through hole 6 is provided in the base body 5 made of insulating material, and a screw 7 is inserted into the base body 5 made of insulating material.
The adhesive 9' is applied between the yoke 1 and the base 5 made of an insulating material for positioning. In addition, the head 8 of the screw 7 is coated with an adhesive 9 or a washer 10 is inserted to prevent the screw from loosening. This structure has the following drawbacks.

Machining a female thread on the yoke increases work time and man-hours.

There is a gap between the yoke fixing screw 7 and the through hole 6 of the insulating material base (5), and the yoke is not fixed until it is fixed with the screws, making it difficult to position the electromagnet part.

Since adhesives 9 and 9' are used to position the electromagnetic portion and to prevent loosening of the fixing screws 7, drying time and drying equipment are required, which reduces work efficiency.

Therefore, in this invention, the yoke 1 and the insulating material base 5, which are the parts constituting the electromagnet part, are fixed together without using the screws 7, thereby reducing the number of parts and shortening the processing and assembly time.

Make positioning of the electromagnet part easier.

By doing so, the object is to obtain an electromagnetic relay that is inexpensive and has less variation in performance.

In order to achieve this purpose, according to the present invention, a through hole having a vertical wall surface serving as a positioning reference surface is provided in a base made of an insulating material, and an inverted L-shaped yoke 1 is attached to the base in this through hole. By inserting a mounting leg that is integral with the yoke, which is provided by extending a part of the lower end of the side perpendicular to the surface, and caulking the end of the leg so as to push it apart, the electromagnet part can be attached to the base body. It is fixed in place.

2 and 3 show an embodiment of the electromagnetic relay according to this invention. The same parts as in FIG. 1 are designated by the same reference numerals, and movable and fixed contacts are omitted. First, to explain FIG. 2, the insulating material base 5
A through hole 6 having a vertical wall surface A serving as a positioning reference surface is bored in the hole. For this hole, one reference wall surface A is perpendicular to the mounting surface B of this insulating material base, the other surfaces are perpendicular to the mounting surface B up to the middle of the insulating material base 5, and thereafter they are directed toward the bottom surface C. It used to have a slope that made it wider. On the other hand, a support leg 11 bent parallel to the mounting surface B and a mounting leg 1' perpendicular to the mounting surface B are formed at the lower end of the vertical side of the yoke. Then, insert the mounting leg 1' of the yoke into the through hole 6 until the support leg 11 comes into contact with the mounting surface B. The tip of the yoke mounting leg 1' is caulked so that the mounting leg is pressed against this surface as a positioning reference surface. This ensures reliable positioning of the electromagnetic portion with respect to the fixed contact. In addition, the yoke can be effectively prevented from coming off by caulking so that the expanded portion 1'' of the end of the mounting leg is in contact with the inclined part of the through hole 6.This prevention method is shown in Fig. 3. It is also effective to use the shape of the through hole 6 as shown in FIG. The structure has a step that is perpendicular to the mounting surface B and widens toward the bottom surface C thereafter, and the yoke mounting leg 1' is caulked so that the widened part 1'' at the tip is hooked onto the step part of this through hole. The processing effectively prevents the yoke from coming off. In addition, as shown in FIGS. 3 and 5, the tip of the yoke mounting leg 1' is pushed apart 1.
This makes it possible to control the movement of the electromagnetic part in the left and right directions. Note that, of course, the supporting legs 11 of the yoke are not inserted into the through holes 6, but are supported by the mounting surface of the insulating material base 5, and are useful for vertical positioning of the electromagnet part, but this may be necessary depending on the case. can be omitted. That is, the end surface itself at the lower end of the vertical side of the yoke 1 in FIG. 3 may be substituted for this. Further, in both FIGS. 2 and 3, the length of the leg 1° is determined so that the tip of the yoke mounting leg 1' does not protrude from the bottom surface C of the base 5 made of an insulating material. This is because the bottom surface C generally often comes into direct contact with a panel or printed board as the mounting surface for an electromagnetic relay.

According to this invention, the yoke is fixed to the insulating material base by caulking without using screws, so there are the following advantages.

Parts such as screws and washers are no longer necessary, and the number of parts can be reduced.

Work such as screw processing, screw tightening, adhesive application and drying is eliminated, and the time for processing and assembly can be reduced.

Positioning is reliable and contact reliability is improved.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a conventional electromagnetic relay, Fig. 2 is a longitudinal sectional view of the main part of the electromagnetic relay according to this invention, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a longitudinal sectional view of the electromagnetic relay according to this invention. FIG. 5 is a sectional view taken along the - line in FIG. 4. FIG. 1...Yoke, 1'...Yoke mounting leg, 1'', 1
... Caulking part, 2 ... Coil, 3 ... Iron core, 4
... Armature, 5 ... Base made of insulating material, 6 ...
Through hole, 11... Yoke support leg, W... Fixed contact, X... Movable contact.

Claims (1)

[Scope of utility model registration request] In an electromagnetic relay in which a yoke of an electromagnet and a fixed contact are mounted on a common base made of an insulating material, the yoke of the electromagnet is formed in an inverted L shape, and the yoke extends perpendicularly to the mounting surface of the base. A mounting leg is integrally formed by extending a part of the lower end of the side, and a through hole with a vertical wall surface serving as a positioning reference surface is provided in the base body, and the vertical side of the yoke is inserted into this through hole. Insert the lower end of the mounting leg, bring the lower end of this side into contact with the mounting surface of the base, and also bring the mounting leg into contact with the positioning reference surface, and push the tips of the mounting legs apart to move the yoke to a predetermined position on the base. An electromagnetic relay that is fixed in position.