JPH1064730A - Outer case for core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer case for a core which can be mounted and fixed to a cable securely without damaging the cable and marrying the filter characteristics and is easy to mate and unmate. SOLUTION: Notches 2 with wider portions are formed in cable led-out portions 1 provided at the ends of an outer case 20 through which a cable is led out, and all corners of the cable led-out portions 1 in contact with the cable are rounded. Grooved thin portions also are formed on the periphery of the cable led-out portions 1. Furthermore at least one elastic protruding portions 6 are provided on the bottom of the inside of the outer case 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer case of a split type core which is used by attaching to a transmission cable or a power cable of a digital electronic device such as a computer, a word processor, a facsimile or the like. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core outer case that prevents damage to a cable and improves the adhesion between cores.

[0002]

2. Description of the Related Art Conventionally, in a digital electronic device, since a high frequency radiation noise generated from the device has a bad influence on peripheral circuits and peripheral devices, a ferrite core for removing noise is provided on a power cable or a transmission cable of the device. By attaching it and attenuating the radiated noise that overlaps this,
So-called EMI countermeasures are implemented to prevent malfunctions of devices.

Generally, the ferrite core includes:
In addition to using an integrated core having a ring shape or a sleeve shape, a cable is formed by using a pair of ferrite cores each having a semicircular cable insertion groove F1 as shown in FIGS. 17 (a) and (b). Is used, and a split core F is used.

After the cable C is inserted into the insertion groove F1, the split core F is made of a synthetic resin halves having a round hole cable opening 1 for inserting a cable at both ends as shown in FIG. Is stored in the exterior case 20.

[0005] Such a conventional outer case 20 is composed of:
With the pressure contact force when the case is closed, the cables to be inserted while the divided cores F are brought into close contact with each other are clamped and fixed, and the hole diameter of the cable opening 1 is made slightly smaller than the outer diameter of the cable C (not shown). The cable C is fixed to the cable C by a tightening force generated by the difference, or a tooth-like projection 1a as shown in FIG. 18 is provided in the cable mouth 1, and the outer periphery of the cable C is bitten and fixed at the sharp end. It was a structure.

[0006]

However, as described above, in the structure in which the cores in the case are brought into close contact with each other merely by the pressing force when closing the outer case 20, the outer case 2
If there is play between the core 0 and the split core F, it is difficult to make sure that the cores are in close contact with each other with a stable force.
In addition, it is difficult to securely fix the split core itself to the case, so that the attenuation characteristics of the filter tend to be unstable.

In order to improve the adhesion between the cores and stabilize the damping characteristics of the filter, the mutual dimensional tolerance between the split core F and the outer case 20 is strictly controlled to prevent backlash. It is necessary, but this has hindered the improvement in productivity and has caused a cost increase.

If the diameter of the cable opening 1 is reduced or if a tooth-like projection 1a is provided for the bite, the cable C inserted by the stress at the time of closing / clamping the outer case 20 becomes the core. There is a problem that it is easily damaged at the edge of the F or the outer case 20 (cable opening 1).

Also, the clamp mechanism 10 of the outer case 20 often has a structure that is difficult to release once locked, and some types require a special tool for releasing the lock. Then, it is not easy to use and it is difficult to take measures against noise.

An object of the present invention is to provide an outer case for a core which solves the above-mentioned drawbacks, can be securely attached to and fixed to a cable without damaging the cable, and does not impair the filter characteristics, and is easily detachable. It is.

[0011]

According to the first aspect of the present invention, a split-type synthetic resin for storing a split core (F) and attaching to a transmission or power supply cable for use. A core outer case (20) made of the same, and a cable opening (1) at both ends of the core outer case (20) through which the cable is inserted is divided into two parts constituting the cable opening (1). A notch (2) having a widened portion is formed in each cable opening, and a roundness (R) is provided at a corner of the cable opening (1) with which the cable contacts when the case is closed.

According to the present invention, a split type synthetic resin outer case for accommodating a split core (F) and attaching to a transmission or power supply cable for use. (20) In the cable opening (1) at both ends of the core outer case (20) through which the cable is inserted, each of the two cable openings forming the cable opening (1) is provided. A projection (4) having a rounded tip portion is provided on the inner wall surface, and a roundness (R) is provided at a corner portion of the cable port (1) with which the cable contacts when the case is closed.

According to the third aspect of the present invention, a groove-shaped thin portion (3) is formed around the cable opening (1) or the cable opening (1) including the cut (2). It is characterized by the following.

Further, according to the present invention, a split type synthetic resin core outer case which houses the divided core (F) and is used by being attached to a transmission or power supply cable. (20) The core outer case (20) through which the cable is inserted has a cable opening (1) at both ends, which is formed by dividing the diameter of the cable opening (1) into two and forming a reduced diameter conical synthetic resin. A clip (5) made of a metal.

According to a fifth aspect of the present invention, at least one or more elastic ridges (6) are provided on the inner bottom surface of the core outer case (20). .

In the present invention according to claim 6, the locking recess (F2) provided on the split core (F) is provided on the inner side facing side of the core outer case (20). It is characterized in that a convex part (9) that can be combined is formed.

According to the present invention, a hook (11) is provided at one edge of the core outer case (20), and the hook (11) is provided at the other opposite edge. ) Is provided with a locking portion (15) having a locking side (14) which can be locked with the clamp mechanism (10) when the case is closed by the hook (11) and the locking portion (15). It is characterized by having done.

Further, according to the present invention, an engagement piece (16) having an L-shaped cross section and having a projection (17) on an edge.
Are provided on the respective outer edges of the core outer case (20), and a recess (19) having a recess (19) which can be fitted to the protrusion (17) from one end of the engagement piece (16) to the inner wall is provided. The present invention is characterized in that a U-shaped slide bar (18) is inserted to form a clamp mechanism (10) when the case is closed.

[0019]

FIG. 1 is an external view showing an embodiment of an outer case for a core according to the present invention.

The core outer case 20 shown in FIG. 1 (hereinafter referred to as the outer case 20) is a synthetic resin split box-shaped case integrally formed through the connecting portion 21, as shown in FIG. A divided square ferrite core F (hereinafter, referred to as a divided core F) is accommodated. In FIG. 1, 1 is a cable opening through which a cable is inserted, 6 is a ridge having elasticity, 9 is a projection for locking and fixing the stored split core F, and 10 is a closed state of the outer case 20. This is a clamp mechanism for holding the clamp.

The above is the schematic configuration of the outer case 20 of the present invention.

By the way, as described above, in such a cable mounting type outer case 20, the hole diameter of the cable opening 1 is made slightly smaller than the outer diameter of the cable, and the cable is tightened by the tightening force generated by the dimensional difference. In order to ensure that the cable is securely fixed, the cable port 1 is designed so that the cable is not damaged by the stress caused by the tightening. This cable fixing structure of the cable port 1 for stress reduction is one of the features of the present invention, and the details thereof will be described below with reference to FIGS.

FIGS. 2 and 3 are external views of a cable opening 1 showing one embodiment of the above-described cable fixing structure.
As shown in the figure, a cut 2 having a narrowed entrance portion and a widened portion at the back is formed in each of the two divided cable ports constituting the cable port 1. In addition, roundness R is provided on the entire corner of the cable port 1 where the cable contacts. FIG. 2 shows an embodiment in which one notch 2 is provided, and FIG. 3 shows an embodiment in which two notches 2 are provided.

Thus, the notch 2 is formed in the cable opening 1.
By providing elasticity to the cable abutting portion and making the corner round so that the cable is hardly damaged even when pressed against the cable, stress applied to the cable when the case is closed is reduced, and damage to the cable can be prevented.

Further, as shown in FIG. 2, by forming a groove-shaped thin portion 3 around the cable opening 1 including the cut 2, the elastic action of the cut 2 becomes more remarkable. The damage prevention effect is improved.

FIG. 4 shows another embodiment. As shown in the figure, the roundness R is provided at the corner of the cable opening 1, and the projection 4 having a rounded tip is provided on the inner wall of the cable opening 1, and the cable 4 can be caught by the projection 4. It is very effective in preventing damage and its structure is simple. This embodiment is an example of a three-point bite cable fixing structure in which two projections 4 are formed on the lower cable opening and one projection 4 is formed on the upper cable opening.

FIG. 5 shows another embodiment. In the present embodiment, a clip 5 having a reduced diameter conical shape is protruded from the split cable opening 1 and the cable is fixed so as to be sandwiched by the clip 5. Since the clip 5 is made of a synthetic resin, the elastic action of the clip 5 prevents damage to the cable.

Next, a description will be given of a structure for fixing the outer case 20 and the split core F, which is another feature of the present invention.

The split outer case 20 integrally formed through the connecting portion 21 can be easily attached to a cable. However, because of the structure of the connecting portion 21, the split core F and the outer case are used when the case is closed. 20 has insufficient adhesion.

Therefore, the inside of the outer case 20 shown in FIG.
The structure provided with the ridge 6 as shown in FIG. The protruding strip 6 is a one-side-supported synthetic resin leaf spring formed by partially cutting each bottom surface inside the split case into a square shape and bending.
When the outer case 20 is closed by storing the split core F in which a cable is inserted into the outer case 20, the split core F is pressed by a constant spring force from above and below by the elastic action of the ridge 6. Therefore, the core is securely fixed in the case, and at the same time, the respective divided cores F are also brought into close contact with a constant pressing force. In the case of the outer case 20 having such a configuration, the outer case 20 and the split core F accommodated therein are provided.
The play produced due to the dimensional error between the cores is surely absorbed by this elastic action, so that the close contact pressure between the cores is always kept uniform, and the attenuation characteristics of the filter are also stabilized. In other words, with such a configuration, it is not necessary to strictly manage the mutual dimensional tolerance between the outer case 20 and the split core F as in the related art.

Further, since it is sufficient that the ridge 6 has elasticity, the same advantageous effects as described above can also be obtained, for example, as shown in FIGS. Is obtained. 7 is a leaf spring made of synthetic resin supported on both sides, FIG. 8 is a coil spring made of metal, FIG. 9 is a pin cushion made of, for example, a piano wire, and FIG. 10 is a double-sided tape made of a synthetic resin or urethane cushioning material. In FIG. 11, a fixed plate to which a spiral leaf spring 8 is attached is attached with a double-sided tape 7 or the like. FIG. 12 shows a case of a cylindrical outer case 20 in which a part of the inner wall of the case is bulged and four holding portions 6 are formed.

The application examples of the ridges 6 have been described above. However, these ridges 6 may be attached to both of the split cases, to only one of them, or to the location and number of the attachments. May be appropriately determined according to the shape and size of the split core F and the outer case 20 to be used.

A groove-shaped or square-hole-shaped recess F2 as shown in FIGS. 6 (a) to 6 (d) is provided on the side surface of the divided core F. Recess F2
(FIG. 6 (c)).
In the case of using the split core F shown in (d), the corresponding convex portion 9 becomes the convex portion 9 shown by a dashed line in FIG. 1), and when the core is stored, the concave portion F2 and the convex portion 9 are respectively formed. The outer case 20 and the split core F are fixed by being fitted. In particular, if the elastic action of the ridge 6 and the fitting action of the concave portion F2 and the convex portion 9 are used together, the fixing of the divided core F becomes more reliable.

Next, the clamp mechanism 10 of the outer case 20, which is another feature of the present invention, will be described with reference to FIGS.

FIGS. 13, 14 and 15 are views showing an embodiment of a clamping mechanism in which the hook 11 and the engaging portion 15 are engaged, and all of which are detachable using the elastic action of the synthetic resin. Therefore, reliable fixing can be realized.

FIG. 13 shows the outer case 20 divided into two parts.
A hook 11 having a guide piece 12 is formed on one of
On the other side, a locking portion 15 provided with a guide groove 13 into which the guide piece 12 can be fitted is formed to constitute a clamp mechanism for keeping the case closed. When closing / clamping the outer case 20, the guide piece 12
Into the guide groove 13 of the locking portion 15, and
The second hook portion 11 is engaged with the engaging side 14 of the locking portion 15.

FIG. 14 shows a triangular hook 11 and an engaging portion 1.
5 is pushed in while being expanded, so that the hook 11
Are engaged.

FIG. 15 shows a structure in which the hook portion 11 is engaged with the engaging side 14 formed on the inner wall of the box-shaped engaging portion 15.

FIG. 16 (a) is an external view of an outer case 20 showing an embodiment of the clamp mechanism 10 using a slide type stopper, and FIG. 16 (b) is a sectional view at the time of clamping.

The present clamp mechanism 10 includes L-shaped engaging pieces 16, 16 formed on the periphery of a split outer case 20.
A sliding bar 18 made of a horizontally long synthetic resin having a substantially U-shaped cross section is inserted while sliding from one end of the engaging pieces 16, 16, and formed at substantially the center of the engaging pieces 16, 16. The projections 17, 17 and the depressions 19, 19 formed on the inner wall of the slide bar 18 are fitted and connected and fixed. The ends of the engagement pieces 16, 16 are provided with R so that the slide bar 18 can be easily inserted.

This clamp mechanism is easier to unlock and can be opened and closed more freely than the above-described clamp mechanism in which the hook portion 11 and the engaging portion 15 are engaged. In addition, since the fastening mechanism is a sliding type bar, the case is more securely fixed.

In the above-described embodiment, all the connecting portions 21
The invention has been described with reference to a two-piece core outer case integrally formed through the above. However, the present invention is not limited to this, and is naturally applicable to a separate type core outer case in which a casing can be completely separated into two.

[0043]

As described above, according to the first to fourth aspects of the present invention, the cable openings at both ends of the outer case are provided with notches having a widened portion, and the cable contact portions have elasticity. By doing so, stress applied to the cable when the case is closed is reduced, and damage to the cable can be prevented. In particular, by forming a groove-shaped thin portion around the cable opening, the elastic effect of the cable opening is increased, and the effect of preventing damage to the cable is further improved. Further, by making the entire corner of the cable opening round, the cable is less likely to be damaged even when pressed against the corner.

Further, by providing protrusions having rounded tips on the inner wall surface of the cable opening and holding the cable with these protrusions, the cable can be securely fixed with a simple structure. In addition, since the corners of the cable opening and the tips of the protrusions, which are in contact with the cable, are round, the cable is not easily damaged.

Further, when a clip having a reduced diameter conical shape is protruded from the cable opening and the cable is fixed so as to be sandwiched by the clip, the stress applied to the cable is reduced by the elastic action of the synthetic resin clip. Cable damage can be prevented.

Next, according to the fifth and sixth aspects of the present invention, an elastic ridge is provided on the bottom surface in the outer case,
When the split core housed in this is pressed from above and below by the elastic action of the ridge, the contact pressure between the cores is always maintained uniformly, and the attenuation characteristic of the filter is also stabilized, so that favorable noise Supply of removed parts can be realized. In addition, even if play occurs between the outer case and the split core, the play can be effectively absorbed by the elastic action of the ridge, so that strict dimensional control of conventional parts is not required, Productivity is improved.

Further, a convex portion which can be engaged with a locking concave portion formed on the divided core is formed on the inner side surface of the outer case,
When the recess and the projection are fitted to each other when the core is housed, the split core can be more reliably fixed to the outer case.

According to the seventh aspect of the present invention, a hook portion is provided at one edge of the split outer case, and a locking portion having an engaging side is provided at the other opposing edge. Since the hook portion is engaged with the engaging side by the elasticity of the resin, the clamp at the time of closing the case is reliable and can be freely opened and closed, so that the attachment to the cable is easy.

Further, according to the invention as set forth in claim 8, since the respective engaging pieces provided on the periphery of the outer case are sandwiched by the attached slide type bar, the above-mentioned hook portion and locking portion are provided. Opening and closing is easier and easier to use, and the case is more securely tightened as compared with the clamp mechanism by the engagement.

[Brief description of the drawings]

FIG. 1 is an external view showing an embodiment of an outer case for a core according to the present invention.

FIGS. 2A and 2B are diagrams showing a cable opening of the core outer case, wherein FIG. 2A is an external view and FIG.

FIG. 3 is an external view of a cable opening different from FIG. 2;

FIG. 4 is an external view of a cable opening different from FIG.

FIG. 5 is an external view of a cable opening different from FIG.

FIG. 6 is an external view of a split core that is stored in a core outer case according to the present invention and has different locking recesses.

FIG. 7 is an external view showing a ridge of the core outer case according to the present invention.

FIG. 8 is an external view showing a ridge body different from FIG.

FIG. 9 is an external view showing a ridge body different from FIG.

FIG. 10 is an external view showing a ridge body different from FIG.

FIG. 11 is an external view showing a ridge body different from FIG.

FIG. 12 is an external view of a cylindrical outer case provided with a ridge different from that of FIG. 11;

FIG. 13 is an external view showing a clamp mechanism of the core outer case according to the present invention.

FIG. 14 is an external view showing a clamp mechanism different from FIG.

FIG. 15 is an external view showing a clamp mechanism different from FIG. 14;

16A is an external view of a core outer case provided with a different clamping mechanism from FIG. 15, and FIG. 16B is a cross-sectional view at the time of clamping.

17A and 17B are external views of a split core housed in a conventional core outer case, wherein FIG. 17A shows a square core and FIG. 17B shows a cylindrical core.

FIG. 18 is an external view of a conventional core outer case.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable opening 2 Cut 3 Thin part 4 Projection with rounded tip 5 Clip 6 Ridge 9 Convex 10 Clamp mechanism 11 Hook 14 Engagement side 15 Engagement part 16 Engagement piece 17 Projection 18 Sliding bar 19 recess 20 outer case for core F split core F2 recess R roundness

Continued on the front page (72) Inventor Masayuki Ichinomiya 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (72) Inventor Kunie 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Inside the corporation

Claims (8)

[Claims] 1. A split-type synthetic resin core outer case (20) for storing a divided core (F) and attaching to a transmission or power supply cable for use. The core outer case to be inserted (20)
At both ends of the cable opening (1), the cable opening (1)
A notch (2) having a widened portion is formed at each of the cable openings divided into two, and a rounded portion (R) is provided at a corner of the cable opening (1) to which the cable is pressed when the case is closed. An outer case for a core, characterized in that: 2. A split type synthetic resin core outer case (20) for accommodating a split type core (F) and attaching to a transmission or power supply cable, wherein the cable is The core outer case to be inserted (20)
At both ends of the cable opening (1), the cable opening (1)
A rounded tip (4) is provided on the inner wall surface of each of the cable openings divided into two, and the corners of the cable opening (1) with which the cable abuts when the case is closed are rounded (R). An outer case for a core, comprising: 3. A groove-shaped thin portion (3) is formed around the cable opening (1) or the cable opening (1) including the cut (2). Item 3. An outer case for a core according to Item 2. 4. A split-type synthetic resin core outer case (20) for accommodating a split core (F) and attaching to a transmission or power supply cable for use. At the cable outlets (1) at both ends of the core outer case (20) to be inserted, cut-off halved conical synthetic resin clips (5) constituting the cable outlets (1) are provided. An outer case for a core, characterized in that: 5. A ridge (6) having at least one elastic member on a bottom surface inside the outer case (20) for a core.
The core outer case according to any one of claims 1 to 4, further comprising: 6. A projection (9), which is engageable with a locking recess (F2) provided on the split core (F), is formed on the inner side facing side of the core outer case (20). The outer case for a core according to claim 5, wherein: 7. A hook (11) is provided at one edge of the core outer case (20), and a hooking edge (10) that can be hooked to the hook (11) is provided at the other opposite edge. A locking mechanism (10) provided with a hook (11) and a locking mechanism (10) when the case is closed by the hook (11) and the locking part (15).
The outer case for a core according to any one of claims 1 to 6, wherein: 8. An engaging piece (16) having an L-shaped cross section having a projection (17) on an edge is provided on each side of said core outer case (20), and said engaging piece (16) is provided. ) Can be fitted into the inner wall surface from one end of the recess (1).
A slide bar (18) having a substantially U-shaped cross section having 9)
The outer case for a core according to any one of claims 1 to 6, wherein a core is inserted to form a clamp mechanism (10) when the case is closed.