JPH084673Y2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Field of the Invention >> The present invention relates to an electromagnetic relay suitable for easily adjusting the opening / closing spring pressure of a contact mechanism.

《Summary of the Invention》 This invention is a return type in which a movable contact member is attached to a fixed contact member implanted in a base so as to come into contact with and separate from the fixed contact member as the coil is excited or demagnetized. By configuring the free end of the spring to abut against the bendable spring receiving portion of the shield case that rotatably supports the movable contact member, and adjusting the bending angle of the spring receiving portion, The spring pressure of the return spring is freely adjusted.

<< Prior Art and Its Problems >> As a contact mechanism of an electromagnetic relay, it is well known that a movable contact member that comes into contact with and separates from a fixed contact member implanted in a base is urged by a return spring.

For example, in the contact mechanism disclosed in JP-A-60-32227, as shown in FIGS. 4 and 5, an electromagnetic block 2 and a contact block 3 are mounted and fixed on a base 1, and The contact block 3 is opened and closed in accordance with the excitation or demagnetization of the coil 4 of the block 2. The contact block 3 is linearly arranged in the box-shaped shield plate 5 from the bottom side of the shield plate 5 to each terminal. 6 and 7 are projected, and contact springs 9 and 9 attached to the tip of the card 8 are interposed between the terminals 6 and 7 and the shield plate 5,
When the contact springs 9 and 9 contact and separate the shield plate 5 and the terminals 6 and 7 due to the displacement of the card 8 due to the excitation or demagnetization of the coil 4, and the contact springs 9 and 9 contact the shield plate 5. Is grounded, and when each terminal 6 and 7 is contacted, it is energized.

Therefore, the contact pressure, the operating voltage, the return voltage, etc. are adjusted by adjusting the spring pressure of the contact spring having the return spring force. Therefore, the bending state of the spring is changed by bending it in the middle with tweezers or twisting the portion to which the return spring is fixed.

However, it is difficult to bend a certain amount of the return spring with tweezers, etc.When twisting the fixed part of the return spring, the tip side, which is the point of action of the spring, will be greatly displaced even with a slight twist. However, there is a drawback that the fine adjustment is difficult.

As described above, the conventional electromagnetic relay has a problem that the opening / closing spring pressure of the contact mechanism cannot be easily adjusted.

<Object of the Invention> The present invention has been made in view of the above problems, and an object thereof is to provide an electromagnetic relay capable of easily adjusting the opening / closing spring pressure of a contact mechanism. Especially.

<Configuration and effect of device> In order to achieve the above-mentioned object, the present invention provides a shield case in which a electromagnetic block and a contact block are placed and fixed on a non-conductive base and the contact block is shielded. A movable contact member that is rotatably supported and is given a return turning force by a return spring is
In an electromagnetic relay configured to come into contact with and separate from a common contact protruding from the bottom surface side of the shield case due to coil excitation or demagnetization, and a normally closed contact and a normally open contact protruding from both sides of the common contact, the top opening of the shield case A pair of spring receiving portions are formed so as to be bendable on the side wall on the side of the section, the free end of the return spring is brought into contact with the spring receiving portion, and the bending angle of the spring receiving portion causes the coil to normally bend. It is characterized in that the spring pressure of the return spring is adjusted during the opening contact operation and the normally closed contact operation.

That is, according to the present invention, the contact block is shielded, and the bendable spring receiving portion is provided on the side wall of the shield case for rotatably mounting the movable contact member, and the spring receiving portion is movable. Since the free end of the return spring that urges the contact member is joined, there is no need to bend and adjust the return spring when adjusting the spring pressure of the return spring. Can be adjusted by bending, and the spring pressure can be easily adjusted by changing the bending angle.

Further, since the shield case and the return spring are in contact with each other at the free end of the return spring and the spring receiving portion, even when the return spring is grounded and used as a high frequency electromagnetic relay, isolation is not adversely affected. And so on.

In addition, the movable contact member is rotatably supported in the shield case, and a return spring is given a return turning force. The bending angle of the spring receiving portion causes the spring pressure of the return spring when the coil is excited and demagnetized. Since it is possible to adjust the spring pressure, it is possible to easily adjust the spring pressure that acts when the coil is excited or demagnetized as in the present invention.

<< Description of Embodiments >> Hereinafter, embodiments of the present invention will be described 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 denotes a base formed of an electrically insulating material such as synthetic resin.

The base 10 is formed with a fitting concavo-convex portion 10a for mounting and fixing the electromagnetic block 20 and the shield case 30 on the upper surface thereof, and a common terminal is provided on one side in the longitudinal direction where the shield case 30 is mounted. A fixed contact member 12 to be formed, a fixed contact member 13 to form a normally-closed terminal, and a fixed contact member 14 to form a normally-open terminal are linearly spaced on the base 10 with the fixed contact member 12 as an intermediate. It is planted on the convex part 10b.

30 is a shield case, this shield case 30
Is formed by bending a metal plate such as brass, has an opening on the upper surface, and has a pair of hinge pieces 31 and 31 standing upright at both ends, and the hinge holes 31 and 31 have a shaft hole 32. , 32 are formed on the same line with each other, and on the side wall on the upper surface opening side,
A pair of spring receiving portions 33, 33 that join the free ends of return springs 50, which will be described later, are formed so as to be bendable.

In addition, ground contacts 34, 35 protruding inward are provided on the side wall of the shield case 30.

Reference numeral 40 denotes a ground terminal which is led out from the bottom surface side of the shield case 30 and penetrates the mounting hole 10c of the base 10 and is grounded to the outside.

The rotating member 51 that constitutes the movable contact member 50 is formed in a plate piece shape from an electrically insulating material such as synthetic resin, and the shaft-like projections 52 and 52 projecting from both upper end surfaces of the rotating member 51 are the shield case 3 described above.
Shield case 30 by fitting in shaft holes 32, 32 of 0
It is rotatably attached to.

Further, two supporting portions 53, 54 are formed on the lower side of the rotating member 51 so as to project, and strip-shaped contact members 55, 56 are formed on the supporting portions 53, 54 in different steps in the thickness direction. It is fixed.

Reference numeral 57 is a return spring. The return spring 57 is formed of a metal plate having an appropriate spring property as a whole, and has a U-shaped attachment portion 57a fitted and attached to the rotating member 51 and the spring of the shield case 30. The pivoting member 5 is formed by the free ends 57b, 57b that are a pair of leaf spring pieces that engage with the receiving portions 33, 33.
The rotating member 51 is interposed between the shield member 1 and the shield case 30.
A restoring force in the clockwise direction in the figure is applied to the rotary member 51 to maintain the rotary member 51 at a predetermined rotary return position.

Since the present invention is configured as described above, when adjusting the spring pressure of the return spring 57, the spring receiving portion 33 of the shield case 30 to which the free ends 57b, 57b of the return spring 57 are joined. , 33 are bent, and the increase or decrease of the spring pressure is adjusted by changing the bending angle of the spring receiving portions 33, 33.

Since the shield case 30 does not need to be springy, it is formed of a metal plate such as brass, so the spring receiving portion 3
It is relatively easy to fold 3,33.

The invention of the present application shields the contact block as described above, and projects a bendable spring receiving portion on the side wall of the shield case that rotatably mounts the movable contact member, and the movable contact is attached to the spring receiving portion. Since the free end of the return spring that urges the member is configured to be joined, there is no need to bend and adjust the return spring when adjusting the spring pressure of the return spring. Can be adjusted by bending, and the spring pressure can be easily adjusted by changing the bending angle.

Further, since the shield case and the return spring are in contact with each other at the free end of the return spring and the spring receiving portion, even when the return spring is grounded and used as a high frequency electromagnetic relay, isolation is not adversely affected. And so on.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an electromagnetic relay according to the present invention,
2 (a) is an enlarged perspective view of a spring receiving portion in the shield case, FIG. 2 (b) is a perspective view showing a state where the spring receiving portion is bent, and FIG. 3 is a contact according to the present invention. FIG. 4 is a plan view of the block, FIG. 4 is an explanatory sectional view of a conventional electromagnetic relay, and FIG. 5 is a partially fragmented enlarged plan view of a contact mechanism portion in the same figure. 10 …… Base 12,13,14 …… Fixed contact member 20 …… Electromagnetic block 30 …… Shield case 33 …… Spring receiving part 50 …… Moveable contact member 57 …… Return spring

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic block and a contact block are mounted and fixed on a non-conductive base. In a shield case that shields the contact block, the electromagnetic block and the contact block are rotatably supported by the shield case and a return spring has a return rotation force. An electromagnetic relay configured such that the given movable contact member is brought into contact with and separated from a common contact protruding from the bottom surface side of the shield case in accordance with the excitation or demagnetization of the coil, and a normally closed contact and a normally open contact protruding from both sides of the common contact. In the above, a pair of spring receiving portions are formed so as to be bendable on the side wall on the upper surface opening side of the shield case, the free ends of the return springs are brought into contact with the spring receiving portions, and An electromagnetic relay characterized in that the spring pressure of the return spring is adjusted during the normally open contact operation and the normally closed contact operation of the coil by the bending angle.