JPH019077Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Related fields of the invention This invention provides an electromagnetic relay that can easily and reliably fix a coil spool wound with a coil to a terminal block base in which contact terminals are embedded. It is related to.

(b) Disadvantages of the prior art In general, most electromagnetic relays are integrated by inserting an iron core into a terminal block base with contact terminals etc. and fixing a coil spool wound with a coil. Conventionally widely used methods for this fixing include heat welding, adhesion, caulking, and screwing. These methods require additional parts such as screws, caulking protrusions, adhesives, etc., or are equipped with heat welding equipment, resulting in a large number of parts and complicated work. required mechanical strength. Further, in conjunction with the above reasons, the mounting space is narrow, making it difficult to perform highly accurate positioning during mounting.

(c) Purpose of the invention This invention was made in order to improve the above-mentioned drawbacks. One collar of the coil spool is formed with a flexible protrusion with a detent, and the other collar is provided with a support step. At the same time as forming a section, a coil terminal is planted,
Further, an engagement projection having a locking hole is formed near the tip of the base surface of the terminal block base, and a jaw-like stepped portion is formed at the rear end, and the flexible projection is inserted into the locking hole of the engagement projection. An object of the present invention is to provide an electromagnetic relay that can securely fix the coil spool to a terminal block base with a single touch operation by inserting and locking the coil spool into the terminal block base and fitting the jaw-like step into the support step. do. Moreover, this invention is based on the above configuration,
Another object of the present invention is to provide an electromagnetic relay that does not require a separate material for fixing, has extremely good assemblability, reduces total cost, and can perform positioning with high precision when fixing.

(d) Description of Embodiments Hereinafter, embodiments of the electromagnetic relay according to this invention will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view of essential parts of an electromagnetic relay according to this invention, and other members such as contact terminals and iron cores are omitted to clearly show the main points of this invention. In the figure,
Reference numeral 1 denotes a terminal block base, and an engaging protrusion 2 having a locking hole 2a is formed near the tip of the base surface 1a. In this embodiment, the locking hole 2a has a horizontally elongated rectangular shape, but its shape needs to be changed to match the shape of a flexible projecting piece, which will be described later. At the rear end of the base surface 1a, a pair of jaw-shaped steps 3, 3 are provided on the left and right sides.
A central projecting portion 4 is formed in the central portion.

A coil spool 5 has a coil wound thereon, and has flanges 6 and 7 at both its front and rear ends. A hole 8 passing through the center of the coil spool 5 is an insertion hole into which an iron core (not shown) is inserted. A pair of flexible projecting pieces 9, 9 are protruded in parallel from the lower end of the collar 6, and a tapered surface 9 tapered toward the front is provided at the tip of the flexible projecting pieces 9, 9.
Detents 9b, 9b with a, 9a are formed. Further, a terminal holding portion 7a is provided as a part of the lower part of the collar 7, and support step portions 10, 10 are formed at both ends thereof, and a recessed portion 11 is formed at the center of the lower end.

The distance between the pair of flexible protrusions is A, the thickness is B, and the width of the locking hole 2a of the engagement protrusion 2 is A',
Let the height be B'. Further, assuming that the distance between the step surface of the support step 10 and the ceiling surface of the recess 11 is C, and the thickness of the jaw-like step 3 is C', these dimensions are set to satisfy the following conditions. ing.

A≦A'B≦B'C≧C' When the coil spool 5 is assembled to the terminal block base 1 while the lower surface of the coil spool 5 is brought into sliding contact with the base surface 1a in the above conditions, the flexible protrusion 9, 9 is the locking hole 2a, and the jaw-shaped step part 3 is the support step part 1.
0, the central protruding portion 4 enters and fits into the recess 11. In particular, the flexible protrusions 9, 9 have tapered surfaces 9
a, 9a bend into a tapered shape while contacting the inner surfaces of both sides of the engagement protrusion 2, and when pushed further in, return to their original state due to their elastic return force. In this state, the detents 9b, 9b are completely engaged with the engagement protrusion 2, the jaw-like step 3 and the support step 10, and the central plunger 4 and the recess 11 are securely fitted together, and the coil spool and the terminal block base 1 are integrated. Furthermore, this operation can be easily and reliably performed with a single touch, and furthermore, dimensional positioning can be achieved with high precision.

FIG. 2 is a vertical sectional view taken along the line of FIG. 1 when the coil spool 5 is fixed to the terminal block base 1. The details have already been described in FIG. 1 and will therefore be omitted.

FIG. 3 shows a terminal block base 1 and a coil spool 5 actually used in an electromagnetic relay in correspondence with FIG. 1. In the figure, the same numbers as in FIG. 1 indicate the same parts, and parts not shown in FIG. 1 will be explained next. 1
2 and 13 are coil terminals, and two coil wires 5a and 5b wound around the coil spool 5 are connected to the coil terminals 12 and 13 by soldering or the like. Reference numeral 15 indicates a contact terminal such as a movable contact or a fixed contact. Conventionally, in commonly used electromagnetic relays, the coil terminals 13 are usually implanted in the terminal block base 1. On the contrary, in this invention, the coil terminal 13 is implanted in the terminal holding portion 7a of the collar 7 of the coil spool 5.

The reason for this is that when the coil terminal 13 is implanted in the terminal block base 1 as in the past, after the coil spool 5 is fixed to the terminal block base 1, the coil wire is attached to the coil terminal 13 by soldering or the like. Therefore, delicate work had to be carried out in an extremely narrow space, and there were problems with ease of work. In this invention, since the coil terminal 13 is implanted in the terminal holding portion 7a of the coil spool 5, it is only necessary to complete soldering to the coil wire first, and then fix it to the terminal block base 1. Therefore, it has excellent workability, such as being able to perform soldering work in a relatively large space.

Further, since the coil terminal 13 is implanted in the terminal holding portion 7a, the holding strength of the coil terminal is also excellent. This is the thickness of the terminal block base 1.
H', and the thickness of the terminal holding part 7a is H.
This is guaranteed by setting the dimensional relationship of H' such that H>H'. This situation can be understood more clearly in FIG. That is, H
The reason why it has to be larger than H' is that in order to insert and fit the central projecting portion 4 into the recess 11, the terminal holding portion upper surface 7b must be higher than the base surface 1a. Therefore, H is greater than H′;
Therefore, the coil terminal 13 is held more firmly when planted in the terminal holding portion 7a than when it is planted in the terminal block base 1.

FIG. 4 is a perspective view showing a completed state of the combination shown in FIG. 3, and since it overlaps with FIG. 3, the explanation thereof will be omitted.

(e) Effects of the invention As detailed above, according to the structure of this invention, since the flexible protrusion and the engagement protrusion are provided, one-touch assembly is possible without the need for mechanical processing or separate parts. The connection and fixation can be completed by operation, and the workability is extremely good, and dimensional positioning can be performed with high precision. Further, since the coil terminal is integrated into the coil spool, it is possible to easily draw out the coil wire and solder the coil wire to the coil terminal. Furthermore, the thicker the terminal holding portion of the coil spool is, the more firmly the coil terminal can be held.

[Brief explanation of the drawing]

Figure 1 is a simplified exploded perspective view of essential parts of the electromagnetic relay according to this invention, Figure 2 is a vertical cross-sectional view of the same relay along the line shown in Figure 1, and Figure 3 is a non-simplified view of the same relay. The main parts exploded perspective view and Fig. 4 are shown in Fig. 3.
FIG. 3 is a perspective view showing a completed state of the combination of the figures. 1... Terminal block base, 2a... Locking hole, 2...
Engagement protrusion, 3... Jaw-like stepped portion, 5... Coil spool, 6, 7... Flange, 9... Flexible projecting piece, 10...
...Support step portion, 12, 13...Coil terminal, 15...
…Connecting terminal.

Claims (1)

[Claims for Utility Model Registration] (1) In an electromagnetic relay assembled by fixing a coil spool to a terminal block base in which contact terminals are embedded, a flexible relay with a detent on one collar of the coil spool. A support step is formed on the other flange, and a coil terminal is implanted therein, and an engagement protrusion having a locking hole is formed near the tip of the base surface of the terminal block base. By forming a jaw-like step at the end, inserting and locking the flexible projecting piece into the locking hole of the engagement protrusion, and fitting the jaw-like step into the support step of the coil spool, An electromagnetic relay characterized in that the coil spool is fixed to a terminal block base. (2) The electromagnetic relay according to claim 1, wherein the thickness of the terminal holding portion of the collar in which the coil terminal is embedded is thicker than the thickness of the terminal block base.