JP2007073250A - Plug-in type electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a terminal support structure so as to enable to secure a required drawing intensity against an insulation board, by additionally forming a simple protrusion at a terminal side. <P>SOLUTION: In the plug-in type electromagnetic relay, an electromagnet, a movable contactor, and a fixed contactor are loaded on the insulation board 9, through which terminals of each above component (for instance, a terminal conductor of the fixed contactor 4) are drawn out toward a rear-face side of the board and plugged into a socket for use. For the terminals fixed and supported to an assembly position by being pressed into square holes 9a opened in the insulation board, press-in protrusions 4b biting into inner faces of the square holes of the insulation board for engagement are formed at their side edge, and at the same time, second protrusions 9c are formed on a board face at a position engaged with open edges of the square holes in exposure at a rear-face side of the insulation board in an assembled state with the terminals pressed into the square holes. The second protrusion is to be a trapezoid with a tapered face formed toward a tip side of the terminal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a plug-in electromagnetic relay, and more particularly to a support structure for a terminal that is pulled out from an insulating substrate of the relay to the back surface side and inserted into a mounting socket.

As the plug-in type electromagnetic relay mentioned above, the electromagnet part, movable contact, and fixed contact are mounted on an insulating substrate, and the terminals of each component are pulled out to the back side of the substrate through the insulating substrate and actually used. There is known an assembly structure in which the terminal is sometimes inserted into a mounting socket for plug-in connection (see, for example, Patent Document 1).
Next, the overall structure of the plug-in electromagnetic relay is shown in FIG. 2, and the conventional terminal support structure is shown in FIG. In FIG. 2, 1 is an electromagnet, 2 is a movable contact (plate spring material) attached to the armature of the electromagnet 1, 3 is a return spring of the armature, and 4 and 5 are arranged opposite to the movable contact 2a with the movable contact 2 in between. The normally closed fixed contact and the normally open fixed contact, 4a and 5a are fixed contacts thereof, 6 is a common terminal connected to the movable contact 2 via a lead wire 7, 8 is a coil terminal of the electromagnet 1, and 9 is Insulating substrates (thermosetting resin molded products such as diallyl phthalate resin and phenol resin), 10 is a cover (transparent resin). Here, the normally closed fixed contact 4 and the normally open fixed contact 5 are made of a flat rectangular conductor that also serves as a faston terminal, and penetrates the insulating substrate 9 together with the common terminal 6 and the coil terminal 8 to have its tip terminal. The part is mounted so as to protrude to the back side of the substrate. The operation of the electromagnetic relay is well known, and the description thereof is omitted here.

Next, taking the fixed contact 4 as an example, a conventional terminal support structure for an electromagnetic relay and its assembling method will be described with reference to FIGS. First, as shown in FIG. 3B, a square hole 9a corresponding to the cross-sectional shape of the terminal conductor is opened in the insulating substrate 9 in accordance with the arrangement of the terminals described above. On the other hand, as shown in FIG. 3C, the terminal conductor of the stationary contact 4 is high at a predetermined position on the left and right side edges (portion inserted into the square hole 9a of the insulating substrate 9 in the assembled state of the terminal). A chevron-shaped press-fitting protrusion 4b having a thickness of about 0.1 mm is formed by pressing or the like, and the terminal is press-fitted in the following manner using the square hole 9a of the insulating substrate 9 as a pilot hole to fix the terminal in the assembly position. I try to support it.
That is, in the terminal assembly process, first, the insulating substrate 9 is carried into a heating furnace, the substrate is heated to the heat deformation temperature of the resin (the heat deformation temperature of diallyl phthalate resin: 180 ° C.), and immediately after being taken out of the heating furnace, The fixed contacts 4, 5, common terminal 6, and coil terminal 8 shown in FIG. 2 are quickly inserted into the square hole 9a with the terminal tip facing downward from the upper surface side of the substrate, and the terminal tip is a predetermined length from the back surface of the substrate 9. Push it to the position where it projects. As a result, the protrusion 4b is press-fitted so as to expand the square hole 9a, and when the insulating substrate 9 returns to room temperature after that, the resin solidifies with the tip of the protrusion 4b biting into the inner surface of the square hole 9, The fixed contact 4 is fixedly supported at a predetermined assembly position with respect to the insulating substrate 9.
JP-A-3-233823 (FIG. 17)

By the way, with the above-described conventional terminal support structure, there are the following problems in terms of support strength. That is, the above-mentioned plug-in electromagnetic relay has an insulating substrate in order to prevent the terminal protruding from the substrate from being pulled back due to the resistance received when the terminal is inserted into the socket while holding the body case. On the other hand, the terminal is defined to have a predetermined support strength (referred to as “pullout strength”) to perform product quality control.
However, when the insulating substrate is heated to the heat deformation temperature in the heating furnace in the terminal assembly process described above, the insulating substrate is not heated to the heat deformation temperature or more and is taken out of the furnace as it is due to fluctuations in the furnace temperature. When the terminal is press-fitted into the square hole in the subsequent process, the press-fit projection 4b formed on the terminal side edge is pushed in while scraping the inner surface of the square hole 9a, and the projection 4b is formed in the square hole 9 when the insulating substrate 9 returns to room temperature. It will not bite inside. In such a state, a predetermined pulling strength is not ensured between the insulating substrate 9 and the stationary contact 4, and when this is done, when the relay is plugged into the socket, the terminal is retracted from the fixed position and is correctly inserted into the socket. The connection cannot be made and the reliability of the product is lowered. As a countermeasure for such a problem, it is conceivable to integrate each terminal by insert molding on an insulating substrate. However, the double contact type electromagnetic relay shown in FIG. However, since the insert molding method has a problem that the position of the insert part is slightly shifted due to the flow of the molding resin injected into the mold, the press-fit support method is currently used.

  The present invention has been made in view of the above points, and an electromagnetic relay having an improved terminal support structure capable of ensuring a required pulling strength with respect to an insulating substrate by additionally forming a simple protrusion on the terminal side. The purpose is to provide.

In order to achieve the above object, according to the present invention, an electromagnet part, a movable contact, and a fixed contact are mounted on an insulating substrate, and the terminals of the respective components pass through the insulating substrate on the back side of the substrate. In the plug-in type electromagnetic relay that becomes an assembly structure drawn out, the terminal is press-fitted into a square hole opened in the insulating substrate and fixedly supported at the assembly position.
A press-fitting protrusion is formed on the side edge of the terminal so as to bite into and engage with the inner surface of the square hole of the insulating substrate, and the back side of the insulating substrate in an assembled state in which the terminal is press-fitted into the square hole on the plate surface. The second protrusion is formed at a position where the second protrusion is exposed to engage with the opening edge of the square hole (Claim 1), and the second protrusion forms a tapered surface toward the tip end side of the terminal. The trapezoidal protrusion is made (claim 2).

With the above configuration, in the assembled state in which the terminal is press-fitted into the square hole of the insulating substrate, the second protrusion is exposed on the back side of the insulating substrate and engages with the opening edge of the square hole, and this protrusion connects the electromagnetic relay to the socket. It functions as a terminal retaining part when plugged in. Therefore, even if the press-fitting projection on the terminal side edge that is press-fitted into the square hole of the board due to insufficient heating temperature of the insulating substrate in the terminal assembly process does not sufficiently bite into the inner surface of the square hole, the second projection compensates for this. The required pullout strength can be secured.
In addition, since the second protrusion has a tapered trapezoidal shape, the protrusion can pass through the square hole without shaving the inner surface of the square hole when the terminal is press-fitted into the square hole of the insulating substrate.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS.
In the illustrated embodiment, in addition to the press-fitting protrusions 4b formed on the left and right side edges of the terminal conductor (fixed contact 4) in the conventional terminal structure of FIG. 3, the terminal plate surface (either the front or back plate surface) is provided. A second protrusion 4c is newly formed. The protrusion 4c is a minute protrusion having a height of about 0.1 mm, and the shape thereof is a trapezoidal protrusion having a triangular cross section having a tapered surface toward the tip end side of the terminal as shown in FIG. It is formed at a position where it is exposed to the lower surface side of the insulating substrate 9 at the assembly position and engages with the opening edge of the square hole 9a.
Then, when press-fitting into the square hole 9a of the insulating substrate 9 from above by the same method as described in FIG. 3, the press-fit projection 4b bites into the inner surface of the square hole 9a as shown in FIG. 1, and the second projection 4c is insulated. It comes out to the back surface side of the board | substrate 9, and comes to oppose the opening edge of the square hole 9a. Since the second protrusion 9c has a tapered surface toward the tip of the terminal and there is a slight clearance between the terminal conductor and the square hole 9a, the second protrusion 9c receives a large resistance force. It is possible to pass through the square hole 9a of the insulating substrate 9 without cutting the inner surface of the square hole.

  In this terminal assembly state, the second protrusion 4c engages with the square hole 9a against the external force in the direction opposite to the press-fitting direction (arrow P in FIG. 1E) to prevent the terminal from coming out in the arrow P direction. To function. Accordingly, even if the terminal-side edge press-fitting protrusion 4b that is press-fitted into the square hole 9a of the substrate due to insufficient heating temperature of the insulating substrate 9 in the terminal assembly process does not sufficiently bite into the inner surface of the square hole 9a, the second protrusion 4c. However, the required pull-out strength can be secured by making up for this.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure showing the terminal assembly structure by the Example of this invention, (a) is a side view of the state which attached the stationary contact to the insulated substrate, (b) is an expanded sectional view of an insulated substrate penetration part, (c) is ( The side view of b), (d) is an enlarged perspective view of the protrusion formation part of the terminal, (e) is the enlarged view of the A part in (c). The perspective view showing the whole structure of an electromagnetic relay 2A and 2B are diagrams showing a conventional terminal mounting structure in FIG. 2, in which FIG. 2A is a side view of a state in which a stationary contact is assembled to an insulating substrate, FIG. 2B is a plan view of the insulating substrate, and FIG. Enlarged sectional view, (c) is a side view of the terminal conductor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnet part 2 Movable contact 4, 4 Fixed contact 4a, 5a Fixed contact 4b Press-fit protrusion 4c 2nd protrusion 6 Common terminal 8 Coil terminal 9 Insulating substrate 9a Square hole 10 Cover

Claims (2)

A plug-in type electromagnetic relay having an assembly structure in which an electromagnet part, a movable contact, and a fixed contact are mounted on an insulating substrate, and the terminals of each component are drawn out to the back side of the substrate through the insulating substrate. In the case where the terminal is press-fitted into a square hole opened in the insulating substrate and fixedly supported at the assembly position,
A press-fitting protrusion is formed on the side edge of the terminal that has a plate shape so as to bite into and engage with the inner surface of the square hole of the insulating substrate. Further, the terminal is insulated in the assembled state in which the terminal is press-fitted into the square hole. A plug-in electromagnetic relay characterized in that a second protrusion is formed at a position exposed on the back side of the substrate and engaging with an opening edge of a square hole. 2. The electromagnetic relay according to claim 1, wherein the second projection is a trapezoidal projection having a tapered surface toward the tip end side of the terminal.

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