JPH0134266Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic relay, particularly to an improvement of a cover.

Conventionally, an electromagnetic relay has been proposed in which an electromagnet and a contact mechanism are housed in a base with an open top and a roughly shaped longitudinal section, terminals are made to protrude from the bottom of the base, and the top opening of the base is covered with a flat cover. ing. In this case, the cover has a protruding fitting part that fits into the inner surface of the opening of the base, and the claw provided on this fitting part engages with the recessed part on the inner surface of the base to prevent it from coming off. .

In the conventional electromagnetic relay described above, the outer periphery of the opening of the base and the outer periphery of the cover are made to coincide with each other mainly for reasons of appearance. However, when this electromagnetic relay is accidentally dropped and the outer periphery of the cover 1, especially the corner 1a, hits the floor F as shown in FIGS. 1 and 2, the impact force is concentrated on the cover 1. There is a drawback that the cover 1 easily comes off from the base 2. Also,
When the contact point with the floor surface F hits the floor surface F in a posture corresponding to the center of gravity G of the electromagnetic relay, the impact force becomes maximum, and the cover 1 may be damaged or deformed.

The present invention was developed in view of these conventional drawbacks, and its purpose is to provide an electromagnetic relay that does not cause the cover to fall off or become deformed even if it is accidentally dropped, by simply changing the shape of the cover slightly. It's about doing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are examples of the present invention.

In FIGS. 3 to 5, reference numeral 10 denotes a synthetic resin base housing an electromagnet, a contact mechanism (not shown), etc. The base 10 is formed in a vertical cross-sectional shape with an open top surface, and a terminal 11 on the bottom surface. stands out.

Reference numeral 14 denotes a cover that covers the upper opening 12 of the base 10. A fitting portion 15 that fits into the inner surface of the opening 12 of the base 10 projects from the lower surface of the cover 14. has a claw 1 that engages with a recess 13 formed on the inner surface of the opening 12 of the base 10.
6 are integrally formed. A flange 17 is formed around the entire outer periphery of the cover 14 and is in contact with the end surface of the opening 12 of the base 10 and located inside the outer periphery of the opening 12 of the base 10. A chamfer 18 is applied to the entire circumference. The angle θ of this chamfer 18 is set to be the same as or smaller than the angle α formed by the side surface of the base 10 and a straight line connecting the center of gravity G of the relay body and the farthest point 12a of the opening 12 of the base 10. .

When the electromagnetic relay with the above configuration is dropped in the position shown by the solid line in Figure 4, the point of contact with the floor F is located directly below the center of gravity G, so the greatest impact force is applied to this contact point, but the It is the opening 12 of the base 10 that comes into contact with the surface, and no large impact force is directly applied to the cover 14.

Furthermore, when the electromagnetic relay falls in the position shown by the dashed line in FIG. Therefore, the moment the electromagnetic relay hits the floor, it rotates in the direction of the arrow and covers 1.
No excessive impact force is applied to the cover 4, and the impact force acts in the direction of pressing the cover 14 toward the base 10, so there is no fear of the cover 14 falling off or being damaged.

Note that the corner 14a of the cover 14 (see Fig. 3)
The chamfer angle θ of the cover 14 is smaller than the chamfer angle θ of other parts, so even if the electromagnetic relay falls in such a position that the corner part hits the floor, the corner part 14 of the cover 14
There is almost no worry that a will hit the floor, so it is safe.

6 to 8 show an example in which the present invention is applied to a high frequency electromagnetic relay.
The base has two recesses 22 and 23 and a step 24 inside the opening, and 25 is one of the recesses 22 and 23.
26 is a contact mechanism housed in the other recess 23, 27 is a cover with a holding part 28 projecting from its lower surface as a fitting part, and 31 is a slightly curved shield that always has upward elasticity. It is a board. This shield plate 31 is placed on the upper surface of the stepped portion 24 and the partition wall 21 so as to cover the upper surface of the recess 23 in which the contact mechanism 26 is housed.
By fitting the shield plate 3 into the recess (not shown) of the base 20, the shield plate 3 is held by the holding part 28 of the cover 27.
1 is pressed, and the repulsive force of the shield plate 31 eliminates the wobbling of the cover 27 with respect to the base 20. As shown in FIG. 8, an external conductive layer 32 is provided on the wall surface of the base 20, and when the cover 27 is attached to the base 20, the cover 27
The holding part 28 holds the shield plate 31 against the outer conductive layer 32.
The shield plate 31 and the external conductive layer 32 are brought into contact and electrically connected. Note that 33 is a terminal.

In this embodiment as well, the flange 29 formed on the outer peripheral edge of the cover 27 is located inside the outer periphery of the base 20, and the flange 29 is chamfered 30. Note that the flange 29 serves as a stopper for attachment to the base 20, but other parts,
For example, if the tip of the presser part 28 comes into contact with the stepped part 24 and functions as a stopper, the flange part 29
is not necessarily necessary due to the structure of the cover 27.

As is clear from the above explanation, according to the present invention, the flange formed on the outer periphery of the cover is located inside the outer periphery of the base, and the flange is chamfered, so that it is possible to accidentally connect an electromagnetic relay. Even if the cover is dropped, excessive impact force is not applied to the cover, eliminating problems such as falling off, damage, and deformation of the cover.

[Brief explanation of drawings]

Figure 1 is a side view of a conventional electromagnetic relay when it falls.
Fig. 2 is a partially enlarged sectional view, Fig. 3 and the following show the present invention, Fig. 3 is a perspective view of the electromagnetic relay according to the present invention, Fig. 4 is a side view of the electromagnetic relay when it is dropped, and Fig. 5 is 6 is an exploded perspective view of an example in which the present invention is applied to a high-frequency electromagnetic relay, and FIG. 7 is a partially sectional plan view with the cover removed.
FIG. 8 is an enlarged sectional view of a part thereof. 10... Base, 11... Terminal, 12... Opening, 14... Cover, 15... Fitting part, 17...
Tsuba, 18... Chamfer, 20... Base, 25...
...Electromagnet, 26...Contact mechanism, 27...Cover,
28... Presser section, 29... Flange section, 30... Chamfer.

Claims (1)

[Scope of claim for utility model registration] (1) An electromagnetic relay in which an electromagnet and a contact mechanism are housed in a base with an open top, terminals protrude from the bottom of the base, and the top opening of the base is covered with a cover. In this case, a fitting portion is formed on the lower surface of the cover to fit into the inner surface of the opening of the base, and a flange is formed on the outer peripheral edge of the cover and is in contact with the end surface of the opening of the base and located inside the outer peripheral edge of the opening of the base. An electromagnetic relay characterized in that the flange is chamfered around the entire circumference. (2) A request for utility model registration characterized in that the chamfer angle of the flange is less than or equal to the angle formed by the side surface of the base and a straight line connecting the center of gravity of the relay body and the farthest point of the opening of the base. An electromagnetic relay according to scope 1.