JPH073567Y2 - Electromagnetic relay - Google Patents

Description

[Detailed Description of the Invention] << Field of the Invention >> The present invention relates to an electromagnetic relay suitable for one-touch installation work of a movable contact member and a shield case, which requires high installation accuracy.

<< Outline of the Invention >> The invention is that both ends of a movable contact member that is fitted between a pair of hinge pieces that are erected at both ends of a shield case,
The movable contact member is attached to the shield case by one-touch by providing a convex portion that automatically pushes out the hinge piece, and the workability of the attachment is improved.

<< Prior Art and its Problems >> As shown in FIG. 3, there is a box-shaped shield case 2 with an upper opening that is fixed onto a non-conductive base 1 via a ground terminal 3 led out from the bottom side, Inside the shaft holes 2b, 2b above the hinge pieces 2a, 2a standing on both ends of the shield case 2, a cylindrical shaft portion 4 projecting from both upper ends of the movable contact member 4 is formed.
An electromagnetic relay in which a and 4a are rotatably fitted and the movable contact member 4 is rotatably attached to the shield case 2 is related to the development of the applicant of the present application.

Then, the movable contact member 4 in the electromagnetic relay is
The shield case 2 is biased by the return spring 5 and is displaced in the shield case 2 in accordance with the excitation or demagnetization of the coil of the electromagnetic block (not shown) placed on the base 1, and protrudes from the bottom surface side of the shield case 2 in an insulated state. The fixed contact members 6 to 8 are connected to and separated from each other.

In this case, the shaft portion 4a of the movable contact member 4 is pressed by the elasticity of the hinge piece portion 2a of the shield case 2 to prevent the shaft piece 4a from falling off, and pivots into the shaft holes 2b, 2b of the pair of hinge piece portions 2a, 2a. Although they can be attached to each other, when they are attached to each other, the hinge pieces 2a, 2a are slightly widened, and the movable contact member 4 is inserted from the upper opening side to insert the shaft holes 2b, 2b and the shaft portions 4a, 4a. Butt and then fit together.

However, since the shaft hole 2a and the shaft portion 4a are rotatably mounted to each other, they are formed to have substantially the same shape. Therefore, it is very difficult to mount the shaft hole 2a and the shaft portion 4a by abutting each other. It was

Further, the shield case 2 is generally formed of a metal plate such as brass to avoid a spring material so that the shield case 2 can be bent easily due to bending in a box shape.

Therefore, when the movable contact member 4 is inserted, if the hinge pieces 2a, 2a of the shield case 2 are excessively expanded, there is a drawback that the movable contact member 4 cannot be held by being plastically deformed, and the movable contact member 4 is evenly expanded in both directions. However, there is a problem that it is necessary to widen it by using a jig or the like, and high mounting accuracy is required.

<Purpose of Invention> The present invention has been made in view of the above problems, and its purpose is to perform one-touch installation work between the movable contact member and the shield case, which requires high installation accuracy. It is to provide an electromagnetic relay that can be carried out in.

<< Structure and Effect of the Invention >> In order to achieve the above object, the invention has a box-shaped shield case with an upper surface opening that is fixed onto a non-conductive base via a ground terminal led out from the bottom side. , The movable contact member is shielded by rotatably fitting a cylindrical shaft portion projecting from both upper ends of the movable contact member into a shaft hole provided above the hinge piece portion erected at both ends of the shield case. In an electromagnetic relay rotatably attached to a case, a protrusion having a right-angled triangular cross section, which is provided at a lower position of a shaft portion of the movable contact member and has a lower surface side which is a tapered surface expanding toward the shaft portion, It is characterized in that an engagement square hole, which is provided in the hinge piece portion at a position corresponding to the convex portion and is larger than the convex portion, is provided.

That is, according to the above-mentioned configuration, when mounting the shield case and the movable contact member, a cross section having a taper surface which is provided so as to project below the shaft portion of the movable contact member and whose lower surface side expands toward the shaft portion. A right triangle-shaped convex portion spreads out the hinge piece portion of the shield case and is provided in the hinge piece portion at a position corresponding to the convex portion, and the movable contact member is provided in the engagement square hole larger than the convex portion. The shaft part can be inserted.

Therefore, according to the present invention, the work of mounting the movable contact member and the shield case, which requires high mounting accuracy, is uniformly spread by using a jig or the like as in the prior art, and the work of abutting them is performed. It is possible to provide an electromagnetic relay that can be performed with one touch without any need.

<< Embodiment >> An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an exploded perspective view showing an example of an electromagnetic relay according to the present invention. In FIG. 1, reference numeral 10 indicates a base formed of an electrically insulating material such as synthetic resin, and 11 is covered from above the base 10. It shows the case.

The base 10 has an electromagnetic block 20 and a shield case 30 mounted and fixed on the upper surface thereof, and has a fixed contact member 12 forming a common terminal and a fixed contact member forming a normally closed terminal on one side in the longitudinal direction. 13 and a fixed contact member 14 forming a normally-open terminal are implanted.

The electromagnetic block 20 is composed of a coil 21 having a magnetic pole surface 21a, an L-shaped yoke 22 surrounding the coil 21, a movable iron piece 23 that comes in contact with and separates from the magnetic pole surface 21a when the coil 21 is excited or demagnetized. .

30 is a shield case, and this shield case 30 is
A pair of hinge pieces 31, 31 are arranged upright on both ends,
Shaft holes 32, 32 are formed in the hinge pieces 31, 31 on the same line, and a spring receiving portion 3 of a return spring 50, which will be described later, is provided.
3, earth contact 34,35 protruding inside the shield case 30
Is provided.

Reference numeral 36 denotes an engaging square hole formed below the shaft hole 32. The engaging square hole 36 is for fitting a convex portion 43 of a rotating member 41 described later, and this convex portion 43 It is formed larger than.

Numeral 37 is a reinforcing portion which is formed so as to project wider than the right and left portions of the engaging square hole 36, whereby the hinge piece portion 31 can prevent bending even when the engaging square hole 36 is opened.

The rotating member 41 that constitutes the movable contact member 40 is formed in a plate piece shape from an electrically insulating material such as a synthetic resin, and columnar shaft portions 42 and 42 are projectingly provided on both upper end surfaces thereof. The parts 42, 42 are rotatably attached to the shield case 30 by fitting into the shaft holes 32, 32 provided in the hinge piece parts 31, 31 of the shield case 30.

Reference numeral 43 denotes a convex portion projectingly provided at a position below the shaft portion 42 of the rotating member 41, and the convex portion 43 is formed in a right-angled triangular cross section having a taper surface whose lower surface extends toward the shaft portion 42. Has been done.

Further, two supporting portions 44, 45 are formed on the lower side of the rotating member 41 so as to project, and strip-shaped contact members 46, 47 are formed on the supporting portions 44, 45 in different steps in the thickness direction. It is fixed.

Reference numeral 50 denotes a return spring. The return spring 50 is formed of a metal plate having an appropriate spring property as a whole, and has a U-shaped attachment portion 51 fitted and attached to the rotating member 41 and the spring of the shield case 30. It is formed by a pair of leaf spring pieces 52, 52 that engage with the receiving portions 33, 33, is interposed between the rotating member 41 and the shield case 30, and returns to the rotating member 41 in the clockwise direction in the figure. A force is applied to maintain the rotating member 41 in a predetermined rotation return position.

Since the present invention is configured as described above, when the movable contact member 40 is inserted from the upper side of the hinge pieces 31 and 31 when mounting the movable contact member 40 and the shield case 30, the movable contact member The hinge piece portion 31 is expanded outward by an appropriate amount due to the tapered surface of the convex portion 43 projecting below the shaft portion 42 of the 40, and if the movable contact member is further pressed downward, the engagement square hole of the hinge piece portion 31 is formed. The convex portion 43 of the movable contact member 40 can be matched with 36.

When they match, the shaft hole 32 of the hinge piece 31
Since the shaft portion 42 of the movable contact member 40 is fitted therein, the hinge piece portion 31 in the opened state returns to its original state, and the end surface of the movable contact member 40 is pressed to be rotatably attached.

As shown in FIG. 2, the distance between the shaft hole 32 and the engagement square hole 36 is set smaller than the distance A from the shaft portion 42 to the tip of the hinge piece portion 31. If the setting is not made in this way, when the hinge piece portion 31 is pushed out by the convex portion 43, the convex portion 43 gets into the shaft hole 32 before the shaft portion 42 gets into the inside of the hinge piece portion 31. This is because the hinge piece 31 is closed.

Since the invention of the present application has the above-described structure, when mounting the shield case and the movable contact member, the movable contact member is provided with a tapered surface projecting below the shaft portion of the movable contact member and the lower surface of which extends toward the shaft portion. The convex part with a right-angled triangular cross section
It can be inserted while pushing the hinge piece of the shield case, and it is automatically moved to the engagement square hole that is provided on the hinge piece at the position corresponding to the convex portion and is larger than the convex portion. The shaft portion of the contact member can be inserted.

Therefore, the one-touch operation is performed without the work of abutting the movable contact member and the shield case, which require high mounting accuracy, with the devices such as jigs and the like to spread them evenly as in the past. It can be installed with.

Furthermore, since the left and right sides of the engaging square hole are bulged to form a wide reinforcing part, even if a square hole is opened in the hinge piece, this part does not weaken, and when covering the case from the upper side. Since the inner side surface of the case is guided by the reinforcing portion, it has an effect of preventing the inner side surface of the case from coming into contact with the return spring on the lower side of the reinforcing portion and being damaged.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an electromagnetic relay according to the present invention,
FIG. 2 is an enlarged vertical sectional view showing an assembled state of the electromagnetic relay shown in FIG. 1, and FIG. 3 is an exploded perspective view of a base and a contact block in a conventional electromagnetic relay. 10 ... Base 30 ... Shield case 31 ... Hinge piece 32 ... Shaft hole 36 ... Engagement square hole 40 ... Movable contact member 42 ... Shaft part 43 ... Convex part

Claims (1)

[Scope of utility model registration request] 1. A box-shaped shield case having an upper surface opening fixed to a non-conductive base via a ground terminal led out from the bottom side, and provided above a hinge piece portion standing upright at both ends of the shield case. In the electromagnetic relay in which the movable contact member is rotatably attached to the shield case by rotatably fitting the cylindrical shaft portion projecting from both upper ends of the movable contact member into the shaft hole, A protrusion having a right-angled triangular cross section, which is provided at a position below the shaft of the member and has a taper surface whose bottom surface extends toward the shaft; and a hinge piece at a position corresponding to the protrusion, and An electromagnetic relay comprising: an engaging square hole that is larger than the convex portion;