JPH0723872Y2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Invention> This invention relates to an electromagnetic relay.

<Prior Art and Problems> Conventionally, as an electromagnetic relay, a terminal case 10 is mounted on a box-shaped base 102 containing an electromagnet block 101 as shown in FIG.
3 is fitted and the contact mechanism 10 built in this terminal case 103
With a fixed contact set between the upper end side barriers 107 of the terminal case 103 by engaging the distal end portion 106a of the movable iron piece 106 driven by the electromagnet block 101 with the movable insulating base 105 for opening and closing the contacts in 4. There is one in which the fixed contact 109 of the screw terminal piece 108 (FIG. 12) is opened and closed by the movable contact 110 on the movable insulating base 105 side.

By the way, regarding the attachment of the plurality of screw terminal pieces 108 set between the barriers 107, in the conventional one, the screw terminal pieces 108 are inserted from below the terminal case 103 and displaced from the insertion position to the tip side, As shown in FIG. 12, the front end of the terminal case 103 is constructed to be laid on the shell 111.

In this case, the electromagnet block 101 is inserted into the base 102 from above, and the terminal case 103 is also attached to the base 102 from above, whereas the screw terminal piece 108 must be inserted from below the terminal case 103. Not only is the assemblability poor, but the mounting state of the screw terminal piece 108 is simply erected on the shaft 111.
It becomes difficult to stabilize. In particular, because the terminal case 103 is open at the bottom because the screw terminal piece 108 is inserted from below, there is a risk of dielectric breakdown due to the difference in applied voltage between the contact mechanism 104 and the electromagnet block 101 side. Therefore, the insulating plate 112 is provided between the terminal case 103 and the base 102.
Therefore, the number of parts is increased, which is troublesome to incorporate.

<Purpose of the Invention> The present invention has been made in order to solve the problems of the above-mentioned conventional ones, and provides an electromagnetic relay which is capable of simplifying the configuration and facilitating the assembling and has a high reliability. It is an object.

<Structure and Effect of the Invention> An electromagnetic relay according to the present invention has a screw terminal piece set between a plurality of barriers on the upper end side, a terminal case with a built-in contact mechanism, and a box-shaped base containing an electromagnet block. Of the movable iron piece driven by the electromagnet block and connected to the movable insulating base for opening and closing the contact in the contact mechanism, an insulating wall between the electromagnet block and the contact mechanism. Is a bottom wall formed on the terminal case, and an inverted T-shaped locking piece is vertically provided at the tip of the screw terminal piece inserted between the barriers from above along the guide portion formed on the barrier. Then, at a predetermined mounting position where the screw terminal piece is displaced from the insertion position to the distal end side, an engaging protrusion that is disengageably engaged with the locking piece is integrally formed with the terminal case. is there.

Also, a locking hole may be formed in the screw terminal piece, and a rib that engages with the locking hole of the screw terminal piece at the mounting position may be formed at the lower end of the side wall of the contact part cover fitted in the terminal case. Good.

According to this invention, the screw terminal piece can be inserted from above the terminal case, which can contribute to the improvement of the assembling property.
Further, by locking the inverted T-shaped locking portion of the terminal piece to the engaging step portion of the terminal case, it is possible to prevent lateral deviation and deviation in the vertical direction and to secure a stable mounting state. Since the bottom wall is an insulating wall, the conventional insulating plate is not required, the number of parts can be reduced, and cost reduction can be expected.

Further, if the rib provided on the contact portion cover fitted to the terminal case is engaged with the locking hole of the screw terminal piece, it is possible to reliably prevent the screw terminal piece from retracting from the predetermined mounting position. .

<Description of Embodiments> An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 each show an example of an electromagnetic relay according to the present invention.

This electromagnetic relay is roughly classified into a base 1, an electromagnet device 2 accommodated in the base 1, a terminal case 3 fitted to the upper end of the base 1, and a contact mechanism 4 built in the terminal case 3.
And a contact portion cover 5 fitted in the terminal case 3.

In the figure, the base 1 is formed of synthetic resin or the like into a substantially box shape having an open upper end surface, mounting holes 6 are formed in the lower end corners, and rail mounting mechanisms 7 are provided on the left and right sides. There is. Reference numerals 8 and 8 are square holes formed on the upper ends of the left and right side walls of the base 1 and engageably engageable with the engagement protrusions 9 and 9 on the terminal case 3 side.

Reference numeral 10 denotes an L-shaped yoke composed of a horizontal piece portion 10A and a vertical piece portion 10B, and a base end side of an iron core 11 is fixed to the vertical piece portion 10B by caulking or the like. 12 is a spool on the outer peripheral surface of the iron core 11
It is a coil wound via 13 and constitutes an electromagnet block 14 together with the yoke 10, the iron core 11 and the like. The tip magnetic pole portion 11a of the iron core 11 which is exposed and fixed to the front side collar portion 13a of the spool 13 is formed in a non-circular shape with a circular part cut out as shown in FIGS. 4 and 5. There is. A ridge 15 is formed on the front side flange portion 13a along the notched end surface of the iron core magnetic pole portion 11a.

An L-shaped eave-shaped portion 16 is integrally formed on the front side flange portion 13a, and socket terminal portions 17A, 17B to which both ends of the coil 12 are connected and a wiring board holding piece portion 18 are formed on the upper surface side thereof. ing. 19 is a wiring board 20 held by the holding piece portion 18
It is a light emitting diode for operation display mounted on, and is connected to the coil 12 in parallel, for example. The electromagnet block 14 is firmly fixed in the base 1 by inserting the vertical piece 10B of the yoke 10 into the fitting portion 21 formed on the inner surface of the side wall of the base 1.

Reference numeral 22 denotes a movable iron piece which constitutes the electromagnet device 2 together with the electromagnet block 14 and which is attracted to and separated from the magnetic pole portion 11a of the iron core 11. The movable iron piece 22 is punched out at the central position of its base end portion as shown in FIG. A convex portion 23 protruding to one side surface side is formed by processing. Corresponding to this convex portion 23, a concave portion 24 is formed by punching to one side surface at the center position of the tip of the horizontal piece portion 10A of the yoke 10, and the movable iron piece 22 is formed with both 23 and 24. The hinge portion 25 is configured.

The terminal case 3 is made of electrically insulating synthetic resin,
As shown in FIG. 3, a plurality of pairs of barriers 27A and 27B are connected to the upper end side in a standing wall shape across the central space 26 on both left and right sides thereof. 28 is an electrically insulating synthetic resin L which is set in the space 26 so as to be movable in the front-rear direction (directions of arrows a and b).
3 is a movable insulating base, in which a plurality of blade-shaped movable contact pieces 29 extending in the left-right direction are elastically held by springs 30 as shown in FIG. Reference numeral 31 is a returning coil spring that applies a forward spring force to the movable insulating base 28. The movable contact 32 (32A, 32A,
32B) is stuck. The drive piece portion 34 protruding from the tip of the movable iron piece 22 and penetrating the through hole 16a formed in the eaves-shaped portion 16 is engaged with the recessed portion 33 formed in the front lower surface of the movable insulating base 28. It is included.

Between each of the barriers 17, a screw terminal piece 36 having a fixed contact 35 shown in FIG. 3 and a screw terminal piece 37 for power input are inserted from above, and these are the movable contact pieces.
The contact mechanism 4 is configured with 29 and the like. Screw terminal piece 36
In (37), as shown in FIG. 7, screw holes 39 of the screw bodies 38 are formed, and small grooves 40, 40 are formed on both sides in the width direction. Further, the screw terminal piece 36 (37) has an inverted T-shaped locking piece 41 vertically provided at the tip thereof. Reference numeral 42 is a contact fixing piece portion formed on the screw terminal piece 36, and 43 is a coil end connecting piece portion formed on the screw terminal piece 37. 44 is Washiya.

Guide ridges 45 are formed on the respective facing surfaces of the barrier 17 so as to fit into the small grooves 40, 40 of the screw terminal pieces 36, 37 and guide downwardly to the insertion position shown by the chain line in FIG. On the inner surfaces of the left and right side walls of the terminal case 3, when the screw terminal piece 36 (37) that has been inserted downward is displaced to the tip side thereof, it can be engaged with and disengaged from the opposite T-shaped locking piece 41 from both sides. Engaging projections 46, 46 (FIG. 7) are formed to engage with each other, and a recess 47 for a screw portion is provided between the barriers 17 corresponding to the screw body 38.
(FIGS. 3 and 7) are formed.

The electromagnet device 2 side and the contact mechanism 4 side are isolated from each other by a bottom wall formed as an insulating wall 48 (FIG. 2) in the terminal case 3.

Slots 49 are formed on the left and right sides of the contact part cover 5 corresponding to the barriers 17, and the slits 49 are formed by inserting the slits 49 into the vertical grooves 50 (FIG. 7) of the terminal case 3.
It is designed to be attached to the side. Reference numeral 51 is a rib formed on the lower ends of the left and right side walls of the contact portion cover 5, and at the mounting position, engages with the locking holes 52 formed in the screw terminal pieces 36, 37 to engage the screw terminal piece 36. It blocks the backward movement of 37. Reference numeral 53 is a window hole formed in the contact point cover 5 for visually recognizing the operation display light emitting diode 19, and 54 is an opening for exposing the protrusion 55 of the movable insulating base 28.

A safety cover 56 has a screw body operation window 57 and a display window 58, and is detachably mounted between the front and rear walls of the terminal case 3.

Reference numerals 59 and 59 denote a pair of elastic clasps projecting from the side surface of the front eave-shaped portion 16 of the spool 13, and are set for holding electronic components.

In FIG. 1, reference numeral 60 denotes a claw portion formed on the contact portion cover 5 and engaged with the step portion 61 of the terminal case 3.

Next, the operation of the above configuration will be described.

When the coil 12 is energized and excited, the tip magnetic pole of the iron core 11
Adsorption force is generated in 11a, and the movable iron piece 22 is adsorbed to the iron core 11 side. Therefore, the movable insulating base 28 engaged with the driving piece 34 on the tip end side of the movable iron core 22 slides and displaces in the direction of arrow b against the spring force of the return spring 31, and each movable contact 32 has a corresponding fixed position. Left and right fixed contact screw terminal pieces that contact the contact 35
The space between 36 and 36 is closed. At this time, the movable contact piece 29 moves the spring 30
Since it is held on the movable insulating base 28 by
Even if there is rattling in the sliding operation of the
The contact relationship between them is well maintained. At this time, since the operation display diode 19 is turned on, the operation state can be grasped by visually recognizing it.

When the coil 12 is de-excited, the movable iron piece 22 of the iron core 11 is removed.
Since the attraction force for the movable insulating base 28 disappears, the movable insulating base 28 is moved in the direction of arrow a by the spring force of the return spring 31 and is restored to the original state.

Since the screw terminal pieces 36 and 37 are inserted from above the terminal case 3, the electromagnet device 2 is incorporated in the base 1 and the terminal case 3 is attached to the base 1 from above. Following the procedure, screw terminal piece
Since it is possible to assemble 36, 37, this will help to improve the efficiency of the assembly work.

Further, by inserting the screw terminal pieces 36 and 37 between the barriers of the terminal case 3 and moving them from the insertion position shown by the chain line in FIG. 8 to the tip side to set them to the predetermined mounting positions in FIG. The inverted T-shaped locking pieces 41 of the terminal pieces 36 and 37 are engaged with the engaging projections 46 on the terminal case 3 side to be positioned as shown in FIG. 10, and are displaced in the width direction and removed in the vertical direction. Is stopped,
The reliable mounting state is stably maintained. In addition, in this state, the rib 51 of the contact portion cover 5 causes the screw terminal pieces 36, 3
Since the screw terminal pieces 36 and 37 are engaged with the locking holes 52, the deviation of the screw terminal pieces 36 and 37 from the predetermined mounting position to the rear is reliably prevented.

Further, in this example, since the threaded portion recess 47 is formed in the terminal case 3 so as to correspond to the screw body 38 attached to the screw terminal pieces 36, 37, when the screw body 38 is removed, the screw Even if dust enters through the hole 39, the recess 47 holds the dust,
Adhesion to the contacts 32, 35 side is prevented.

In particular, since the insulating wall between the electromagnet device 2 side and the contact mechanism 4 side is constituted by the bottom wall 48 of the terminal case 3, there is no need to provide an insulating plate as in the conventional case, and the number of parts is reduced. It is easy to assemble and is advantageous in cost.

[Brief description of drawings]

1 and 2 are an exploded perspective view and a side sectional view showing an example of an electromagnetic relay according to the present invention, and FIG. 3 is a top view showing a state in which a screw body of a terminal case in the electromagnetic relay is removed, 4 is a perspective view showing a tip magnetic pole portion of an iron core in the same electromagnetic relay, FIG. 5 is a front view of a coil spool in the same electromagnetic relay, and FIG. 6 is a perspective view showing a hinge part of a movable iron piece of the same electromagnetic relay. FIG. 7 is a perspective view showing a locking portion of a screw terminal piece of the electromagnetic relay, FIG. 8 is a sectional view of a terminal case in the electromagnetic relay, and FIG. 9 is a sectional view showing a mounting state of the screw terminal piece of the electromagnetic relay. Fig. 10 is an explanatory view of the locked state of the screw terminal piece, Fig. 11 is a side sectional view showing a conventional electromagnetic relay, and Fig. 12 is a sectional view showing a mounting structure of the screw terminal piece in the conventional electromagnetic relay. It is a figure. 1 ... Base, 3 ... Terminal case, 4 ... Contact mechanism, 5 ... Contact part cover, 14 ... Electromagnetic block, 17 (17A, 17B) ... Barrier, 22 ... Movable iron piece, 28 ... Movable insulating stand, 35 ... Fixed contact, 3
6, 37 ... Screw terminal piece, 41 ... Locking piece, 45 ... Guide part, 46 ... Locking part, 51 ... Rib, 52 ... Locking hole.

Claims (2)

[Scope of utility model registration request] 1. A terminal case having screw terminal pieces set between a plurality of barriers on the upper end side and having a built-in contact mechanism is fitted to the upper end side of a box-shaped base containing an electromagnet block, and the electromagnet is formed. In an electromagnetic relay in which the tip side of a movable iron piece driven by a block is connected to a movable insulating base for opening and closing contacts in the contact mechanism, an insulating wall between the electromagnet block side and the contact mechanism is formed in the terminal case. An inverted T-shaped locking piece is vertically installed at the tip of the screw terminal piece which is composed of a bottom wall and is inserted between the barriers from above along a guide portion formed on the barrier to attach the screw terminal piece. An electromagnetic relay, wherein an engaging protrusion that engages with the locking piece in a disengageable manner is integrally formed with the terminal case at a predetermined mounting position displaced from the insertion position to the tip side. 2. A rib for forming a locking hole in the screw terminal piece, and engaging a locking hole of the screw terminal piece at the mounting position at a lower end of a side wall of a contact part cover fitted in the terminal case. The electromagnetic relay according to claim 1, wherein the electromagnetic relay is integrally formed.