JPH084708Y2 - Plug - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an insertion plug having a built-in noise filter element for reducing a noise signal that intrudes into an electronic device from a power supply line, and particularly, improves workability during manufacturing. The present invention relates to an insertion plug with improved quality and reduced manufacturing cost.

[Background technology]

As a method of reducing noise that enters from a power supply line with a noise filter element, it is known to use an insertion plug having a built-in noise filter element.

As this noise filter element, it is possible to use a choke coil in which a ring-shaped magnetic core is covered with an insulator and a pair of windings are wound around its outer periphery. It is inserted in series between the plug terminal and the cord core. Then, it becomes an inductance with respect to the common mode noise, and the common mode noise can be attenuated. As an insertion plug incorporating such a choke coil, for example, Japanese Utility Model Application No. 62-177788
And Japanese Patent Application No. 1-138906.

In the plug-in plug shown in Japanese Patent Application No. 62-177788, a choke coil formed by winding a pair of windings around an annular core covered with an insulating cover has a circular plate having a projecting body protruding substantially vertically from the center, It is housed in a coil holding portion having a peripheral wall that projects substantially vertically from the peripheral edge portion. The coil holding portion is integrated with a connecting portion accommodating portion that accommodates a connecting portion between the winding end of the coil and the cord core, and an insulating base that fixes the rear portion of the plug terminal to form a fixing member.

When assembling such an insertion plug, first,
The projecting body of the coil holding portion is passed through the hole of the choke coil, and the choke coil is housed in the coil holding portion so that the choke coil is protected by the peripheral wall. Next, one winding end of the choke coil and the cord wire core are connected to the connection terminal fixed to the connection portion accommodating portion, and the other winding end of the choke coil is connected to the rear end of the plug terminal. After that, the plug body is injection-molded so as to cover from the rear end of the plug terminal to the cord to complete the insertion plug.

On the other hand, in the plug-in plug disclosed in Japanese Patent Application No. 1-138906, an annular core is housed in an annular core housing which is closed by a separate lid, and a pair of windings are wound around the outer circumference to form a choke coil. To do. This annular core housing is integrated with the insulating base that secures the pair of plug terminals and the housing for the connecting portion. The winding end of the choke coil and the plug terminal, and the winding end and the cord core. The connection with and is made in the same manner as in the above-mentioned example, and the plug body is molded in the same manner.

In each of the above examples, the plug terminal, the cord, and the choke coil connected between them are fixed by an integral fixing member, which requires a small number of parts and can be securely fixed. Have advantages.

[Problems to be Solved by the Invention] However, the conventional plug-in plug has the following problems.

The insulating base that fixes the plug terminal, the choke coil holding part, and the connection part housing part that houses the connection terminal for connecting the winding end of the choke coil and the cord core are integrated, In order to avoid an increase in size, the gap between each of the above parts is reduced.

The choke coil winding and the plug terminal are connected by soldering by winding the winding (outer diameter 0.6 to 1.0 mm) to the rear end of the plug terminal, but the gap between the plug terminal and the coil housing is small. Since the length of the winding is short, it is difficult to wind the winding in close contact with the rear end of the plug terminal, and there is a risk that the winding may be wound in a state of floating from the plug terminal. If the solder connection is made in such a state, the molten solder adheres only to the winding wire, resulting in a connection failure.

Also, since the plug terminal and the winding have different outer diameters, and the heating part is limited to a fixed position by the insulating base, the choke coil holding part, etc., even if both are heated simultaneously with the soldering iron, the winding will not Although it is easily heated, the temperature of the plug terminal rises slowly due to the large volume of the heated portion. In general, when solder is insufficiently heated, it is difficult for the solder to permeate, and the solder tends to be insufficiently permeated into the plug terminal. To check the quality of such solder connection, it is convenient to apply external force to check whether or not it is completely connected, but there is no extra length at the winding end, and the plug terminal and choke Since the coil is fixed, it cannot be confirmed by applying external force.

Similarly, it is difficult to confirm the quality of the connection between the other winding end and the connection terminal.

As described above, there are problems in that workability in connecting the plug terminal to the winding wire and between the winding wire and the connection terminal is poor, and it is difficult to confirm whether the connection is good or bad.

Furthermore, it is necessary for the fixing member to have a gap for connecting the winding end between the rear end of the plug terminal and the choke coil holding part, and between the coil holding part and the connection part housing part. It is difficult to miniaturize the plug body, and due to changes in the rated current, etc., the choke coil size cannot be accommodated when it is increased, and when it is reduced, there is a gap in the holding part. Can no longer fix the coil. Therefore, there is also a problem in that a plurality of types of fixing members must be prepared so as to meet the specifications of the choke coil.

Therefore, an object of the present invention is to easily and appropriately connect the plug terminal and the choke coil winding, and the cord core and the choke coil winding, and improve workability. It is to provide a plug.

Another object of the present invention is to provide a plug plug of high quality in which the quality of connection of each connection portion can be easily confirmed.

Yet another object of the present invention is to provide a plug plug which can downsize the plug body and whose fixing member can adapt to the size change of the choke coil.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention has an insulating base, a noise filter element, and a cord that have a bent portion substantially at the center, and a base portion having a plurality of protrusions that stand substantially vertically from the bent portion to one end. The bending portion and the other end are fixed in a predetermined positional relationship by a band-shaped body that forms a pressing portion that forms a pair with the base portion, and the bending portion is bent at a substantially right angle to lock one end and the other end. By this, while the pressing portion and the plurality of protrusions provide a fixing space for the insulating base and the noise filter element,
It is intended to provide an insertion plug in which a cord is clamped by one end and the other end.

The fixing member is composed of, for example, a band-shaped body that can be bent at a substantially central position, one from the bent portion to both ends constitutes a base portion having a plurality of protrusions standing substantially vertically, and the other is a pressing portion. When the bending portion is bent at a substantially right angle, the pressing portion is located above the base portion.

[Action]

In the plug-in plug having such a configuration, the rear ends of the pair of plug terminals are connected to one lead end of the pair of windings of the choke coil, and the other lead end of the winding is connected to the cord core. After that, a choke coil or the like is fitted between the plurality of protrusions of the fixing member base. Therefore, the insulating base, the cord, and the choke coil are not fixed at the time of connection, and the winding end of the choke coil is securely wound around the rear end of the plug terminal without floating. Also, soldering is facilitated, and it is possible to confirm whether or not the connection is complete by applying external force.

The connected plug terminal, cord and choke coil are fitted to the fixed member, and when the bent part of the fixed member is bent at a substantially right angle, the pressing part comes above the base part and the connection base and choke fitted to the base part. Fix the coil and cord.

At this time, it is not necessary to provide a gap for connecting work between the insulating base and the choke coil, and between the choke coil and the cord holding portion, and they can be collectively fixed, and the plug body can be downsized. . Further, if the projection inserted into the center hole of the choke coil is made movable with respect to the fixing member, one fixing member can fix choke coils of various sizes.

〔Example〕

Hereinafter, the insertion plug of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a plug according to the present invention, in which a pair of plug terminals 10 are provided in front of a plug body 61 injection-molded with a plastic such as vinyl chloride resin. A cord protector 62 is formed behind the plug body 61, and the cord 70 is guided through the cord protector 62 into the plug body 61. The plug body 61 has a choke coil (described later) having a pair of windings wound around an annular core as a noise filter element.

2 (a), (b) and (c) are exploded perspective views showing the internal structure of the plug body 61. As shown in FIG.

In FIG. 2A, the pair of plug terminals 10 are fixed to the insulating base 20 at regular intervals. The choke coil 30 has an annular magnetic core (not shown) with an insulating coating
30a is provided, and a pair of windings 31 and 32 are wound around the outer periphery of the winding 30a so as to cancel out magnetic flux from each other.
One lead end 33, 35 is connected to the rear end of the plug terminal 10, and the other lead end 34, 36 is connected to the cord wire core 70a of the cord 70 by a connecting terminal 70b.

2B and 2C show a fixing member for fixing the choke coil 30, the plug terminal 10 and the cord 70 connected as described above. This fixing member consists of a strip-shaped insulator,
Bent portions 44a, 44b are provided at substantially the center thereof, and one bent portion 44a to its tip 41a constitutes a base portion 41,
From the other bent portion 44b to the tip 42a, the pressing portion 42
Is configured. The part sandwiched between the two bent parts 44a and 44b constitutes the front pressing part 43.

On the base 41, projecting pieces 47 that are inserted into the center hole 37 of the choke coil 30 and partition walls 48 and 49 that come into contact with the outer peripheral surface of the choke coil 30 are provided on both sides of the projecting pieces substantially vertically.

The front end 41a has two locking pieces 51a that are raised to lock with the pressing portion 42, and a notch 50a through which the cord 70 penetrates is provided at the center of the front end. Also,
The respective facing surfaces of the locking pieces 51a have locking recesses (not shown) that fit with locking projections 52 described later.

A locking piece 51b is also raised at the tip 42a of the pressing portion 42, has locking projections 52 on both sides, and has a notch 50b through which the cord 70 penetrates at the tip.

This locking piece 51b is inserted between the locking pieces 51a at the base,
The locking convex portion 52 is adapted to be fitted and locked in a locking concave portion provided on the facing surface of the locking piece 51a of the base 41.

The base portion 41 and the pressing portion 42 are insulating base holders 46, 4 for holding the insulating base 20 near the bent portions 44a, 44b.
When the bent portions 44a and 44b are bent at a substantially right angle, the tips of both of them come into contact with each other. Further, the insulating base holders 46 and 46 'have holes 46 into which the protrusions 22 provided on the back surface of the insulating base 20 are fitted, as shown in FIG.
have a.

In the front holding part 43 sandwiched between the bent parts 44a and 44b,
Hole 45 into which the protrusion 21 provided on the front surface of the insulating base 20 fits
Is provided.

 Hereinafter, the procedure for assembling the insertion plug of the present invention will be described.

Before fixing the choke coil 30, the insulating base 20 to which the plug terminal 10 is fixed, and the cord 70 with the fixing member 40, the lead ends 33 and 35 of the choke coil 30 and the plug terminal 10, and the lead end 34 and 36 and the cord 70a of the cord 70 are connected to each other.

The lead ends 33 and 35 are connected to the plug terminal 10 by winding the lead ends 33 and 35 with a strong tension around the rear end of the plug terminal 10 having the notch 12 as shown in FIG. Weld the solder in close contact with the terminal 10. Further, the connection between the lead ends 34 and 36 and the cord wire core 70a is performed by inserting the lead ends 34 and 36 and the cord wire core 70a into the inside of the cylindrical connection terminal 70b, and crimping them to both sides of the connection terminal 70b. Weld the solder and connect. When the connection is completed, external force is applied to each connection portion to check the quality of the solder connection.

Next, the projecting piece 47 provided on the base portion 41 of the fixing member 40 is inserted into the center hole 37 of the choke coil 30, and the base portion 41 is provided on the side surface.
The partition walls 48 and 49 which are raised from above are fitted and fixed at the positions where they come into contact with each other.

The back surface of the insulating base 20 to which the plug terminal 10 is fixed is brought into contact with the insulating base holding body 46, and the projection 22 on the back surface is fitted into the hole 46a provided in the insulating base holding body 46. Bend 44
Each of a and 44b is bent at a right angle so that the front pressing portion 43 is brought into contact with the front surface of the insulating base 20, and the pressing portion 42 is fitted on the upper edge of the insulating base 20 and between the partition walls 48 and 49. Abut the upper surface of 30.

The locking piece 51b provided at the tip 42a of the pressing portion 42 is a base portion.
It is inserted between the two locking pieces 51a provided at the tip 41a of 41, and the locking projections 52 of the locking pieces 51b and the locking recesses of the locking pieces 51a are fitted to each other to form the base 41. The pressing portion 42 is locked.

As a result, the choke coil 30 and the insulating base 20 sandwiched between the base portion 41 and the pressing portion 42 are fixed. Code 70 is
Notch 50a of locking piece 51a provided on base 41 and pressing portion
It is arranged so as to penetrate the notch 50b of the locking piece 51b provided at 42, and is sandwiched by the bottoms of both notches.

After that, the plug body 61 having the cord protection portion 62 is integrally molded from the rear portion of the plug terminal 10 to the locking piece 51a so as to cover the fixing member 40, thereby completing the insertion plug.

In the plug-in plug as described above, the lead ends 33 and 35 of the choke coil 30, the plug terminal 10, and the lead ends 34 and 36.
Can be connected to the cord core 70a before fixing the choke coil, etc., and the lead ends 33, 35 of the winding are closely attached to the plug terminal 10 for winding, so that the degree of freedom in connection can be increased and soldering can be performed. It is possible to make a connection by penetrating the inside of the wound lead wire. Further, after connection, external force can be applied to check the quality of the connection.

Further, the choke coil 30, the insulating base 20, and the cord 70 are fixed by a fixing member 40 that holds them, and the insulating base 20 has a base portion 41, a front holding portion 43, a holding portion 42, an insulating base holder 46, It is held in the space provided by 46 'and, moreover, by fitting the holes 45, 46a with the projections 21, 22, the correct position is maintained even when the plug body is molded.

The choke coil 30 is also positioned by the projecting piece 47 inserted into the center hole 37 of the annular core and the partition walls 48, 49, and the accurate position is maintained in the subsequent steps.

The cord 70 is firmly clamped by the locking piece 51a provided on the base portion 41 and the locking piece 51b provided on the pressing portion 42, and the plug body 6
Even if tension is applied between 1 and the cord 70, no tension is exerted on the connection between the choke coil and the winding. Further, since the choke coil is sandwiched by the fixing members, it is possible to prevent the choke coil from being broken due to the twisting force and the pressing force applied to the plug body when the plug is used.

FIGS. 4 (a) and 4 (b) show a second embodiment of the present invention, and the same parts as those in FIGS. Explanation is omitted,
The base portion 41 has insertion holes 71, 72, and the holding portion 42 has fixing holes 71, 72.
a, 72a, 49a are respectively formed, and the first projecting piece 55 and the second projecting piece 56 projecting from both ends of the bottom portion 54 of the projecting body 53 are respectively inserted into the insertion holes 71, 72. The insertion holes 71, 72 are the base 41
Is longer than the first projecting piece 55 and the second projecting piece 56 so that the first projecting piece 55 and the second projecting piece 56 can slide in the length direction, and the projecting body 53 is attached to the base 41 in the width direction. The size is smaller than or smaller than the first protrusion 55 and the second protrusion 56 so that they can be fixed. The separation dimension of the first projecting piece 55 and the second projecting piece 56 corresponds to the radial dimension of various choke coils that differ depending on the rated current, etc. The center hole of the choke coil is inserted in the first projecting piece 55, and the choke coil is inserted. The second projecting piece 56 comes into contact with the outer periphery of the. Also,
At this time, a partition wall 49 smaller than the width of the base portion 41 contacts the other outer circumference of the choke coil. In addition, the fixing hole 71 of the pressing portion 42
a and 72a have the same dimensions as the insertion holes 71 and 72, and the fixing hole 49a is the partition wall 4
It has the same dimensions as 9. Recess 59 and insertion hole 71
The plate member 57 having the hole 58 of the same size as that is used as a spacer when the size of the choke coil is reduced.

Insulation base 20, choke coil 3
The fixing of 0 and the code 70 is performed as follows.

The protrusion 53 is selected according to the size of the choke coil 30, and the first protrusion 55 and the second protrusion 56 are inserted into the insertion hole 7 of the base 41.
It is inserted into 1, 72, and the bottom portion 54 is brought into close contact with the base portion 41 from the lower surface.

The center hole of the choke coil 30 is inserted into the first projecting piece 55, and the outer periphery of the choke coil 30 is inserted into the second projecting piece 56 and the partition wall.
Abut on 49 and hold and fix.

When the size of the choke coil 30 is changed, the first projection 55 and the second projection 55 are inserted in the insertion holes 71 and 72 so that the length from the partition wall 49 to the first projection 55 matches the radius of the choke coil 30. Move piece 56 to correspond.

Further, when the size of the choke coil 30 is changed in the thickness direction, the plate member 57 is arranged above or below the choke coil 30. At this time, the first protrusion 55 is inserted into the hole 58, and the second protrusion 56 is engaged with the recess 59.

After that, the first projecting piece 55 and the second projecting piece penetrating the base portion 41
56 is engaged with the fixing holes 71a and 72a of the pressing portion 42, and the partition wall 49 is engaged with the fixing hole 49a. Further, the locking pieces 51b are inserted between the locking pieces 51a to insert the locking pieces 51b. Are engaged and integrated. After that, the plug body is provided by the method described above to complete the insertion plug.

According to this embodiment, when the size of the choke coil is reduced, for example, the protruding pieces 55, 56 of the protruding body 53 are brought close to one end of the insertion holes 71, 72 and the fixing holes 71a, 72a on the plug terminal side. By inserting and fixing, and when it becomes large, the choke coils of various sizes can be fixed by one fixing member 40 by moving to one end on the cord side of the hole and inserting and fixing the projecting pieces 55, 56. .

[Effect of device]

As described above, according to the insertion plug of the present invention, the insulating base, the noise filter element, and the cord have the bent portion substantially at the center, and the bent portion to one end have a plurality of protrusions that are substantially vertically erected. The base part is fixed in a predetermined positional relationship from the bent part to the other end by a band-shaped body which constitutes a pressing part forming a pair with the base part, and the bent part is bent at a substantially right angle to lock one end and the other end. By doing so, the pressing base and the plurality of protrusions provide a fixed space for the insulating base and the noise filter element, and the cord is clamped by the one end and the other end, which facilitates the connection work and determines whether the connection is good or bad. Confirmation becomes possible, and a reliable connection can be provided and a high-quality plug can be provided. In addition, since it is fixed after connecting, it is not necessary to provide a gap (dead space) for connecting work in the band-shaped body, so that the plug main body can be downsized and the cost can be reduced. Further, since the choke coils of various sizes can be fixed by one strip, the cost can be further reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention, FIGS. 2 (a), (b) and (c) are exploded perspective views of the above embodiment, and FIG. 3 shows a front surface and a back surface of an insulating base. FIG. 4 is a perspective view, and FIG. 4 is an explanatory view showing a second embodiment of the present invention. Explanation of code 10 …… Plug terminal, 12 …… Notch 20 …… Insulation base 21,22 …… Protrusion 30 …… Choke coil 30a …… Insulation coating 31,32 …… Winding 33,34,35,36… … Lead end 37 …… Center hole, 40 …… Fixing member 41 …… Base part, 42 …… Pressing part 43 …… Front pressing part 44a, 44b …… Bending part 46 …… Insulating base holder 46a …… Hole, 47 ...... Projection piece 48,49 …… Partition wall 50a, 50b …… Notch 51a, 51b …… Locking piece 52 …… Locking convex part, 53 …… Projection body 54 …… Bottom part 55 …… First projection piece, 56 …… Second protrusion 57 …… Plate, 58 …… Hole 59 …… Notch 61 …… Plug body 62 …… Cord protector, 70 …… Cord 70a …… Cord core, 70b …… Connecting terminal 71,72 …… Insertion hole 71a, 72a …… Fixed hole

Claims (4)

[Scope of utility model registration request] 1. A plug plug in which a pair of plug terminals and a cord fixed by an insulating base are connected via a noise filter element composed of a choke coil for attenuating noise superimposed on a power supply line, wherein the insulating base, the The noise filter element and the cord have a bent portion substantially at the center, and the bent portion to one end constitute a base portion having a plurality of substantially vertically standing projections, and the bent portion to the other end are It is fixed in a predetermined positional relationship by a strip-shaped body that constitutes a holding portion that forms a pair with the base portion, and the one end and the other end are locked by bending the bending portion at a substantially right angle,
The insertion plug, wherein the pressing portion and the plurality of protrusions provide a fixed space for the insulating base and the noise filter element, and the cord is held by the one end and the other end. 2. The plug according to claim 1, wherein the plurality of protrusions include a fitting protrusion that fits in a center hole of the choke coil, and the bent portion is formed by a hinge. 3. The plurality of protrusions include a protrusion having first and second protrusions inserted into first and second insertion holes provided in the base, and the first insertion. The hole is formed in such a size that the first and second protrusions can move in the lengthwise direction of the base and are fixed in the widthwise direction. Plug in. 4. The first projecting piece and the second projecting piece,
4. The plug according to claim 3, which has a spacing dimension that matches the radii of various choke coils.