JPH04233115A - Terminal structure for electromagnetic relay - Google Patents

Abstract

PURPOSE:To prevent a defective contact in screwing a terminal screw by forming a side piece in such a shape that a press-fit aperture is choked in piercing a fastening piece through the press-fit aperture, and by extending a groove of a protruding piece which projects from the upper surface of a terminal part via a through-hole so as to caulk and fix a fixed contact member to a terminal part. CONSTITUTION:The installation of a fixed terminal plate 15 to a terminal part 21 is performed by press-fitting a fastening piece 15c into a press-fit aperture 31 from below while thrusting a contact plate in such a way that a protruding piece 15e is inserted into a through-hole 32. Here, slides 15h being protruded from both sides of the fastening piece 15c more upwardly with them fitted in concave parts on both sides of guide grooves 32a in a guide part 33. The insertion is completed in such condition that the fastening piece 15c and the protruding piece 15e are inserted into the press-fit aperture 31 and the through-hole 32 and a bottom plate 15a contacts with the inner bottom surface of a recess 30. At this time, a rising piece 15b fits into a groove 34 formed extending from the inner part to the upper part of the recess 30. A part for screwing a terminal screw can thus be isolated from a fixed contact 12 with the terminal part 21 and a side piece 15g so that no chips adhere to the contact during screwing.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal structure for an electromagnetic relay.

0002

2. Description of the Related Art A conventional electromagnetic relay is shown in FIG. This electromagnetic relay has a body 1a with one side serving as a storage chamber 20 in which an electromagnet block 2 is housed, and the other side serving as a terminal portion 21', and a box-shaped body 1a with an open bottom that is attached to the body 1a. The case 1 is composed of the cover 1b and the cover 1b.

The electromagnetic block 2 includes a yoke 3 bent into a substantially L-shape, and a coil block 4 placed on the bottom plate 3a of the yoke 3 and formed by winding a coil 5 around a coil bobbin 6. and an iron core 7 fixed to the mounting hole 3b of the bottom plate 3a of the yoke 3 through the through hole 6a of the coil bobbin 6,
A magnetic pole piece 8a is swingably supported by clamping pieces 3c protruding from both sides of the upper end of the yoke 3, and comes into contact with a flat adsorption piece 7a formed on the upper end of the iron core 7 when the coil 5 is energized.
and a return spring 9 which is interposed between the armature 8 and the yoke 3 and biases the magnetic pole piece 8a of the armature 8 away from the iron core 7 when the coil 5 is not energized. Become. Note that the coil 5 is connected to a coil terminal 16 implanted in the body 1a.

A contact block 10 whose contacts are switched in accordance with the operation of the electromagnetic block 2 has two movable contacts 1.
1 is fixed to the movable contact plate 13, and this movable contact plate 13
a movable spring 14 that connects the fixed piece 8c vertically from the central lower end of the insulating part 8b of the armature 8, and a fixed contact plate 15' attached to the terminal part 21' of the body 1a and to which the fixed contact 12 is fixed. It is composed of

In this electromagnetic relay, when the coil 5 is not energized, the spring piece 9a of the return spring 9 is connected to the insulating part 8b of the armature 8.
By pressing the upper surface of the armature 8, the armature 8 is rotated counterclockwise, and the magnetic pole piece a of the armature 8 is separated from the attraction piece 7a of the iron core 7. At this time, in the case of this electromagnetic relay, the movable contact 11 is in contact with the fixed contact 12. When the coil 5 is energized, the yoke 3, the iron core 7 and the armature 8
Through this, a magnetic force is generated that attracts the magnetic pole piece 8a of the armature 8 to the attraction piece 7a of the iron core 7, and the magnetic pole piece 8a of the armature 8 is attracted to the attraction piece 7a of the iron core 7 against the spring force of the return spring 9. Ru. At this time, the movable contact plate 13 rotates together with the armature 8, and the movable contact 11 separates from the fixed contact 12.

[0006]

By the way, as the fixed contact plate 15' of the above-mentioned electromagnetic relay, one having the structure shown in FIG. 6 was used. This fixed contact plate 15' includes a bottom plate 15a.
A screw hole 15d' into which a terminal screw (not shown) is screwed is formed in the bottom plate 15a'. A fixed piece 15c' to which the fixed contact 12 is fixed is formed by bending. The portion of the terminal portion 21' of the body 1a where each fixed contact plate 15' is mounted is hollow, and the fixed contact plate 15' is made hollow.
Attachment to the terminal portion 21' is carried out by inserting the fixed contact plate 15' into the terminal portion 21' in the illustrated state shown in FIG. Terminal part 2
1', as shown in FIG. 7 or FIG.
6, and when the fixed contact plate 15' is housed in the cavity from below, the sides of the bottom plate 15a' are locked to the lower surface 24 of the protrusion 26, preventing it from coming off upward, and the protrusion 26 is prevented from coming off upward. The fixed contact plate 15' was attached to the terminal portion 21' by bending the protruding piece 15e' protruding from the upper end of the rising piece 15b' into a recess 25a formed in the upper surface 25 of the terminal part 26. Note that the hatched portions in FIGS. 8 and 9 indicate the contact points of the respective members.

However, with the conventional structure of the fixed contact plate 15' and the terminal portion 21', the screw hole 15
Since there is no member between d' and the fixed contact 12, there is a problem in that chips generated when tightening the terminal screw adhere to the contacts 11 and 12, causing poor contact. The present invention has been made in view of the above points,
The purpose is to provide a terminal structure for an electromagnetic relay that does not cause poor contact due to chips generated when tightening terminal screws.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a bottom plate having screw holes for screwing terminal screws, and a bottom plate that stands up vertically from the bottom plate and is separated from the top by a groove. a rising piece with a protruding piece protruding from it, a side piece protruding from the side edge of the protruding piece of the standing piece towards the bottom plate, and a side piece protruding upward from the side edge opposite to the protruding piece of the side piece. A fixed contact plate is provided, and a fixed contact plate is provided with a fixed piece having a fixed contact fixed to the upper part thereof, and a recessed portion for receiving the fixed contact plate from below is formed in the terminal portion to which the fixed contact plate is attached, and the fixed contact plate is communicated with the recessed portion. A press-fit hole and a through hole are formed through which the fixed piece and the protrusion pass through, and a side piece is formed in a shape that closes the press-fit hole when the fixed piece is inserted into the press-fit hole, and the side piece protrudes from the upper surface of the terminal part through the through-hole. A fixed contact plate is caulked and fixed to the terminal portion by widening the groove of the protruding piece.

In addition, in the case of a structure in which the fixed contact plate is fixed to the terminal portion by caulking the protruding pieces, the separation between the protruding pieces and the side pieces may be performed by shear cutting as shown in claim 2. is preferred.

0010

[Operation] By adopting the above-described structure, the present invention makes it possible to isolate the part where the terminal screw is screwed from the fixed contact by the terminal part and the side piece, so that when the terminal screw is screwed, This prevents contact failure due to generated chips.

[0011] Note that when the protruding piece and the side piece are separated by shear cutting, there is no wasted space created when separating the protruding piece and the side piece by punching, and the width of the protruding piece can be made wider. The projecting piece can be formed to have a width sufficient to perform caulking.

0012

Embodiment FIGS. 1 to 4 show an embodiment of the invention. The fixed contact plate 15 of this embodiment has a bottom plate 15 as shown in FIG.
A protruding piece 15e is provided protruding from the center of the upper end of the rising piece 15b raised from a, and a V-shaped groove 1 is formed at the tip of this protruding piece 15e.
5f is formed, and the side part of the protruding piece 15e is bent toward the bottom plate 15a side to form a side piece 15g, and the protruding piece 15 of this side piece 15g is
It has a structure in which a fixed piece 15c to which the fixed contact 12 is fixed is erected upward from the side edge opposite to e. Here, the fixed piece 15c has a slide piece 15h formed on both sides of the upper part to form a substantially arrow shape, and the fixed contact 12 is fixed to the upper part.

A recess 30 for housing the fixed contact plate 15 is formed on the lower surface of the terminal portion 21 to which each of the fixed contact plates 15 is attached, and a press-fit hole 31 is inserted through the recess 30 to the upper surface to pass the fixing piece 15c. At the same time as forming the projecting piece 1
A through hole 32 is formed through which the hole 5e passes. A guide portion 33 in which a guide groove 33a for guiding the fixed piece 15c upward is formed protrudes from one side of the press-fit hole 31 through which the fixed piece 15c passes. Note that a space 36 is formed in the portion of the recess 30 into which the terminal screw is screwed, to avoid the tip of the terminal screw.

The fixed contact plate 15 of this embodiment is attached to the terminal portion 21 by press-fitting the fixing piece 15c into the press-fitting hole 31 from below and inserting the protruding piece 15e into the through-hole 32. Push in the plate 15. At this time, the slides 15h protruding from both sides of the fixed piece 15c move upward while being fitted into the recesses on both sides of the guide groove 32a of the guide portion 33. Then, the fixed piece 15c and the protruding piece 15e are completely fixed.
is inserted into the press-fit hole 31 and the through hole 32, and the insertion is completed with the bottom plate 15a in contact with the inner bottom surface of the recess 30. At this time, the raised piece 15b fits into the groove 34 formed upward from the inner side of the recess 30. This state is shown in FIG. In addition, when the fixed contact plate 15 is inserted into the terminal portion 21 in this manner, the side piece 15g is formed so that the side piece 15g closes the lower part of the press-fit hole 31. Therefore, the part where the terminal screw is screwed and the fixed contact 12 are connected to the terminal part 2.
1 and the side piece 15g, chips generated when screwing the terminal screws do not adhere to the contacts 11 and 12, and poor contact can be prevented. Finally, as shown in FIG. 3, when the protruding piece 15e is caulked to open the V-groove 15f, the attachment of the fixed contact plate 15 to the terminal portion 21 is completed. In addition, in order to perform caulking in this manner, a recess 15i is formed in the lower part of the upright piece 15b.

By the way, the space between the projecting piece 15e and the side piece 15g is separated by shear cutting, so that there is no wasted space as would be the case if they were formed by punching.
The width of the protruding piece 15e can be changed. Therefore, the projecting piece 15e can be formed to have a sufficient width necessary for caulking. In addition, in the case of FIG. 1 above, one fixed contact plate 15
4 shows the partial structure of the terminal portion 21 corresponding to the above, but in reality, as shown in FIG.
Terminal portions 21 corresponding to No. 5 are formed in rows in the horizontal direction according to the number of fixed contact plates 15.

When this type of electromagnetic relay is used for a long time, repeated contact and separation between the movable contact 11 and the fixed contact 12 generates consumable powder from the contacts 11 and 12, and this consumable powder acts as a guide for the fixed contact 12. There was a risk that the insulating material would adhere to the 33 part and deteriorate the insulation condition, and in the worst case, it could lead to burnout. Therefore, in order to prevent this, it is preferable to form a substantially T-shaped groove 35 between the guide portions 33 between the fixed contacts 12 adjacent to each other. In other words, with such a shape of the groove 35, it becomes difficult for consumable powder to enter the lateral groove portion, and the surface distance between the fixed contacts 12 can be increased, so that the insulation state can be improved.

[0017]

[Effects of the Invention] As described above, the present invention includes a bottom plate having screw holes for screwing terminal screws, and a projecting piece that stands up vertically from the bottom plate and is separated from its upper end by a groove. A standing piece, a side piece protruding from the side edge of the protruding piece of the standing piece toward the bottom plate, and a fixed contact fixed to the upper part of the side piece that is erected upward from the side edge opposite to the protruding piece. A recess is formed in the terminal portion to which the fixed contact plate is attached, in which the fixed contact plate is accommodated from below, and the fixed contact plate and the projecting piece are communicated with the recess and penetrated through the fixed contact plate. A press-fit hole and a through hole are formed, a side piece is formed in a shape that closes the press-fit hole when the fixing piece is inserted into the press-fit hole, and the groove of the protruding piece that protrudes from the upper surface of the terminal part through the through-hole is opened and expanded. Since the fixed contact plate is caulked and fixed to the terminal part, the part where the terminal screw is screwed can be separated from the fixed contact by the terminal part and the side piece.
This has the advantage of not causing poor contact due to chips generated when the terminal screws are screwed.

Furthermore, when the protruding piece and the side piece are separated by shear cutting, there is no wasted space created when separating the protruding piece and the side piece by punching, and the width of the protruding piece can be reduced. The projecting piece can be formed to have a width sufficient to perform caulking.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a part of a terminal portion and a fixed contact plate according to an embodiment of the present invention.

FIG. 2 is a perspective view of the fixed contact plate housed in the terminal portion.

FIG. 3 is a perspective view showing a fixed state of the fixed contact plate.

FIG. 4 is an explanatory diagram of a method for improving insulation between fixed contacts.

FIG. 5 is an exploded perspective view of a conventional electromagnetic relay.

FIG. 6 is a perspective view of the fixed contact plate same as above.

FIG. 7 is an explanatory diagram of a method of inserting a fixed contact plate into a terminal portion.

FIG. 8 is an explanatory diagram of a method of fixing a fixed contact plate.

FIG. 9 is a partially cutaway perspective view showing the structure of a terminal portion that fixes the fixed contact plate.

[Explanation of symbols]

12 Fixed contact 15 Fixed contact plate 15a Bottom plate 15b Standing piece 15c Fixed piece 15d Screw hole 15e Projection piece 15f V groove 15g side piece 21 Terminal section 30 Recessed part 31 Press-fit hole 32 Through hole

Claims (2)

[Claims] [Claim 1] A bottom plate having a screw hole for screwing a terminal screw, a rising piece having a projecting piece vertically raised from the bottom plate and separated from the upper end by a groove, and a rising piece. Fixing consisting of a side piece that protrudes from the side edge of the side piece toward the bottom plate, and a fixed piece that stands upward from the side edge opposite to the side piece and has a fixed contact fixed to the top. A contact plate is provided, and a recess into which the fixed contact plate is received from below is formed in the terminal portion to which the fixed contact plate is attached, and a press-fit hole and a through hole are formed in communication with the recess to allow the fixed piece and the protruding piece to pass through. A side piece is formed in a shape that closes the press-fit hole when the fixing piece is inserted into the press-fit hole, and the groove of the protruding piece that protrudes from the top surface of the terminal part is expanded through the through-hole to fix the contact plate to the terminal part. A terminal part structure of an electromagnetic relay characterized by being formed by caulking and fixing. 2. The terminal structure of an electromagnetic relay according to claim 1, wherein the protruding piece and the side piece are separated by shear cutting.