JPS583121B2 - tightening band - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tightening band for mutually tightening and fixing each component in a horizontally mounted electrical component that requires a core to be grounded, such as an electromagnetic relay, which consists of a plurality of components. It is.

For example, as shown in Fig. 1A and B, in an electromagnetic relay, contact blocks 3, 4, etc. are fixed to the iron core 1. A substantially U-shaped tightening band 5 having spring characteristics holds the contact blocks 3, 4, etc., and a claw body 54 provided at the tip of the tightening band 5 is connected to a protrusion-like protrusion provided on both sides of the iron core 1. There is a type that is hooked onto the locking part 11 and locked.

Before the contact blocks 3, 4, etc. are attached to the iron core 1, the tightening band has a bottom portion 51 bent toward the holding side of the contact blocks 3, 4, etc., as shown by the two-dot chain line in FIG. 1A. Pretension is applied, and the bottom portion 51
Side parts 52 are provided on both sides of the iron core 1 and bent in the same direction, and the locking part 1 of the iron core 1 is attached to the tip of the side parts 52.
1 and a claw body 54 for locking the tightening band 5 to the locking portion 11.

To fix the contact blocks 3, 4, etc. to the iron core 1, the three members 1, 3.4 are overlapped and the tightening band 5 is stretched upward in the drawing against the pretension applied to its bottom 51. ．． The locking part 11 of the iron core 1 is inserted into the hole 53 of the tightening band 5.
Insert.

The contact blocks 3, 4, etc. are firmly held on the iron core 1 by the pretension applied to the bottom 51 of the tightening band 5, and the tightening band 5 itself is held firmly by the locking portion 11 of the iron core 1 by the claw body 54 due to the pretension. It is attached to the iron core 1 in such a way that it is pressed into place.

By the way, in the conventional tightening band 5 described above, as shown in FIG. At this time, not only is the tip of the claw body 54 oriented against the insertion direction, making the installation work difficult, but also, after installation, a force FA directed downward in the drawing is generated on the side portion 52 due to the pretension of the bottom portion 51. , this force FA acts on the base P of the claw body 54, and a component force FB is generated at the tips of the tightening band 5 in which the tips are directed outward from each other, so that the tightening band 5 tends to fall off from the iron core 1, and furthermore, Since the protruding direction of the claw body 54 is in the forward direction with respect to the direction in which the tightening band 5 is removed, when a force in the direction of removing the tightening band 5 is applied to the tips of both side parts 52 of the tightening band 5, the iron core 1, the tightening band 5 easily falls off.

The present invention has been made to solve the above-mentioned conventional drawbacks, and the first purpose is to provide a tightening band that is easy to install, securely holds each member after installation, and does not easily fall off. It's about getting.

Additionally, in electromagnetic relays mounted on printed wiring boards, parts other than the contacts, such as the iron core, must be grounded depending on the device. The second purpose is to obtain a configuration that can perform the grounding perfectly.

For this purpose, in the present invention, the claw bodies of the tightening band are made to project outward from each other, and a grounding terminal is provided integrally with the tightening band, focusing on the fact that the tightening band is firmly fixed to the iron core etc. did.

Hereinafter, an embodiment in which the present invention is applied to an electromagnetic relay will be described in detail based on FIGS. 2 to 4.

Fig. 2 is a side view of an electromagnetic relay using the tightening band according to the present invention, Fig. 3 is a perspective view showing the tightening band and the members fixed by it arranged in the order of assembly, and Fig. 4 is the same as Fig. 2. FIG.

In FIGS. 2 to 4, each member and each part thereof according to the present invention is as shown below.

In the following description, all parts other than those related to the present invention employ known techniques, so matters explained with symbols are limited to those directly related to the present invention.

1... Iron core 11... Interlocking part 2... Return spring 21... Cut arrow part 3... Meter contact block 31... Guide groove 4... Break contact block 41... Guide groove 5... Tightening band 51... Bottom. 52...Side part, 53...Engagement hole, 54...Fourth claw body, 55...Contact terminal, 56...Second claw body, 57...Holding space In the electromagnetic relay according to the embodiment of the present invention, the return spring 2 A make contact block 3 and a break contact block 4 are fixed to the iron core 1 by a tightening band 5.

Each member related to the implementation of the present invention will be explained below with reference to FIG.

The iron core 1 is made of soft iron and has a substantially E-shape, and has protruding locking portions 1 on its sides for locking the tightening band 5.
1 is provided.

The return spring 2 is formed of an elastic metal thin plate into a substantially U-shape, and has a notch 21 formed on its side so that the tightening band 5 does not abut against it.

The meter contact block 3 and the break contact block 4 each have a pair of contact springs embedded in a substantially U-shaped base made of insulating material, and guide the engagement of the tightening band 5 on both sides of the base. A guide groove 31 is formed.

The tightening band 5 is formed by bending a metal plate (conductive member) having spring characteristics into a substantially U-shape, and the bottom portion 51 has a bottom portion 51 with the bottom portion 51 facing the holding space 57 of each member at approximately the center thereof.
That is, by bending the side parts 52 in the opposite direction to the direction in which they extend, pretension bending is applied in the direction in which the member held by the tightening band 5 is pressed, and the side parts 52 are bent from the center part to the side parts. A ground terminal 55 that is bent and protrudes in a direction opposite to that of 52 is integrally formed.

Further, at the tip of the side part 52 of this tightening band 5, there is an engagement hole 53 that engages with the protrusion of the locking part 11 of the iron core 1, and from the upper side of the engagement hole 53 to the inner side of the engagement hole 53. Both sides 5
2, that is, a space 57 for holding the held members (the fitting and return spring 2, the meter contact block 3, and the break contact block 4 in the embodiment); A first pawl body 54 is formed that protrudes in the opposite direction and at an acute angle with respect to the side portion 52.

Further, at the tip of the ground terminal 55, a second claw body 56 is provided which is punched out and raised at an acute angle with the upper side open in the drawing.

In order to mutually fix each member explained above, first the iron core
, the return spring 2, the make point block 3 and the break contact block 4 are stacked in this order, and the guide grooves 34 and 4 of the make contact block 3 and break contact block 4 are stacked.
4 along the side 52 of the tightening band 5 through its engagement hole 5.
3 is positioned at the locking part 11 of the iron core 1 against the pretension applied to the bottom part 51, and then the ends of both side parts 52 are fitted in such a direction that the distance between the ends narrows. Apply force to force the engagement hole 53 into engagement with the locking portion 11 .

This operation can be easily performed by sliding the tip of the claw body 54 onto the upper surface of the locking portion 11 since the claw body 54 protrudes in the opposite direction to the press-fitting direction.

As described above, tighten the return spring 2, make contact block 3, and break contact block 4 to the iron core 1, and tighten the band 5.
The fixed state can be understood from the sectional view shown in FIG.

That is, in FIG. 4, the bottom portion 51, which is bent and pretensioned on the side of the holding space 57 of each member, is bent in the direction of returning the bending against the pretensioning force, and is almost It is horizontal.

In this state, tension is generated in the tightening band 5, and a force FD directed upward in the drawing is generated in the approximately central portion of the bottom portion 51 and the portion in contact with the break contact block 4, and a force FD directed upward in the drawing is generated in the both side portions 52. A directed force FA is generated, and the return spring 2, meter contact block 3, and break contact block 4 are firmly tightened and fixed between the iron core 1 and the bottom part 51 of the tightening band 5 by the fastening force generated by the forces FA and FD. .

Considering the direction of the force acting on the branch point P of the first claw body 54 in this state, the downward force F acting on both side parts 52 is
A is a component force FC generated in the protruding direction of the first claw body 54 and a component force F directed inward to bring both branch points P closer together.
B acts so that it occurs at the branch point P, and the above component force F
B acts to narrow the distance between the tips of both side portions 52 (acts in the opposite direction to force FB in the conventional example shown in FIG. 1A).

), the return spring 2, make contact block 3, and break contact block 4 are firmly held by the tightening band 5 without the tightening band 5 falling off the iron core 1.

Furthermore, even if a force in the direction of removing the tightening band 5 is applied to the tips of the both sides 52 for some reason, the first claw body 54
Since the tip of the fastening band 5 is locked in such a manner that it is wedged into the locking part 11 of the iron core 1, the tightening band 5 does not fall off from the iron core 1.

The tightening band 5, which is firmly fixed to the iron core 1 in this way, is in a state where it is completely electrically connected to the iron core 1, so by grounding the tightening band 5, the iron core 1 is completely grounded. Ru.

For this reason, in the present invention, a grounding terminal 55 is provided on the tightening band 5 as shown in FIGS. 2 and 3.

The tightening band 5 holds each block of the electromagnetic relay (for each block stacked in the vertical direction) at the bottom of the U
Since it is held at the bottom 51 of the iron core 1, if the ground terminal 55 is provided at the bottom 51 of the tightening band 5, which is actually the lowest part, the ground terminal of the iron core 1 can be led out to the mounting plate, for example, the printed wiring board side. can.

A second claw body 56 is cut out at the tip of the ground terminal 55 so that the upper side in the drawing is open (the rear side is open with respect to the insertion direction when mounting the mounting board on the printed wiring board, which is the mounting plate). When the electromagnetic relay is mounted on a printed wiring board, the grounding terminal 55 is inserted into the wiring hole of the printed wiring board against the springing characteristic of the second claw body 56, and the relay is completely inserted into the wiring hole of the printed wiring board. When inserted, the second claw body 56 opens its legs on the opposite mounting surface (generally the printed pattern surface) of the printed wiring board to form a hook shape, thereby locking the electromagnetic relay to the printed wiring board.

In this way, the electromagnetic relay is prevented from falling off the printed wiring board after it is mounted and before it is soldered.

As is clear from the above detailed explanation, according to the present invention, (A) the protruding direction of the claw bodies that lock the tightening band is directed outward from both sides, so that the locking band can be locked as shown in FIG. 1A. Unlike the case where the locking claws are provided facing inward, in the case of the present invention, after each member is held and fixed with this tightening band, the ends of the open side of both sides of the tightening band are provided with the retaining claws facing inward. Since a directed force is applied, the tightening band does not fall off.

(B) Since the tightening band is difficult to fall off, it is possible to firmly hold and fix each member even if the material of the tightening band is made thinner than before, contributing to the weight reduction of parts. .

(C) The protruding direction of the claws that lock the tightening band is toward the outside of both sides, that is, the opposite direction to the insertion direction when locking, and as mentioned above, the tightening band is made of a thinner material than the conventional one. As a result, assembly work using the tightening bands for each member can be easily performed.

(D) Since the claws that lock the tightening band face in the direction of removing the tightening band, the tightening band will not fall off even if an external force is applied to the tightening band for some reason.

(E) Since a grounding terminal is provided on the tightening band that firmly contacts each member, it is possible to easily and reliably ground components mounted on a printed wiring board, for example.

Various beneficial results such as these can be obtained, and the present invention has extremely significant effects.

Although the present invention has been explained above using an example in which the present invention is applied to a tightening band of an electromagnetic relay, the present invention is not limited to this and can be applied to any electrical component made up of a plurality of members. .

[Brief explanation of the drawing]

Figures 1A and 1B are front and side views for explaining a conventional example, Figures 2 to 4 are diagrams for explaining an embodiment of the present invention, and Figure 2 is a diagram for explaining an embodiment of the present invention. FIG. 3 is a side view of the electromagnetic relay according to the embodiment, FIG. 3 is a perspective view showing the members fixed by the tightening band arranged in the order of assembly, and FIG. 4 is a sectional view taken along line AA' in FIG. 2. DESCRIPTION OF SYMBOLS 1... Iron core, 2... Return spring, 3... Make contact block, 4... Break contact block, 5... Tightening band, 11... Locking part, 51... Bottom, 52... Side, 53
...Engagement hole, 54...First claw body, 55...Ground terminal,
Arrows FA-FD...Direction of tension generated by the tightening band.

Claims (1)

[Scope of Claims] 1. A member for holding and tightening and fixing a plurality of members, which is made of an elastic material and formed into a substantially U-shape, and is bent on the holding side of the plurality of members. A bottom portion, a pair of side portions extending in the same direction from both ends of the bottom portion, and engaging portions provided at the tips of the side portions and formed on a member located at the top of the plurality of members. 1. A tightening band characterized by having an engaging hole for locking the lock, and a pawl projecting outward from the vicinity of the locking hole at an acute angle and locking in pressure contact with the locking portion. 2 A member for holding and tightening and fixing a plurality of members, which is made of an elastic conductive material and formed into a substantially U-shape, and has a bottom portion bent toward the holding side of the plurality of members, and a bottom portion a pair of side parts extending in the same direction from both ends of the side part, and an engagement part provided at the tip of the side part to engage with a locking part formed on a member located at the top of the plurality of members. a hole, a pawl projecting outward from the vicinity of the engagement hole and mechanically locking by pressing against the locking portion, as well as being electrically connected to the locking portion; A tightening band characterized by having an integrally formed ground terminal. 3. The tightening band according to claim 2, characterized in that the grounding terminal is made to protrude at the bottom in a direction opposite to the extending direction of both side parts. 4. The tightening band according to claim 2 or 3, characterized in that the tip of the grounding terminal is opened at the rear in the direction of insertion into the mounting hole when attached to the mounting plate, and is shaped like a hook.