JP2001203045A - Fitting structure of arrester to coaxial connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting structure of an arrester to a coaxial connector, in which the arrester can be easily and surely fitted as well as speedily and easily replaced. SOLUTION: An electrode 5 is provided with an inner contact 1 of a coaxial connector E having an inner contact 1 and an outer contact 2 in concentric position insulated from each other. A screw hole 12 is put on the outer contact 2. An arrester G is inserted into the screw hole 12 to contact the electrode part 5, and at same time, is clamped and fixed by a conductive cap 13 with a male screw part 14 for spirally connecting with the screw hole part 14. Further, an outer peripheral surface 17 is formed at the tip end of the male screw part 14 of the cap 13 with less radius than the screw hole 12, and the outer peripheral surface 17 and the outer peripheral surface 19 of the arrester G are held and fitted with a cylindrical holder 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching an arrester to a coaxial connector, which conducts when a dielectric surge voltage is applied due to a lightning strike.

[0002]

2. Description of the Related Art Conventionally, in order to protect a wireless device or an electronic device from an induced surge voltage due to a lightning strike on an antenna feed line, for example, a two-terminal gas arrester (discharge element) is connected to a coaxial connector between the feed line and the device. ) Is provided. The coaxial connector has an internal contact and an external contact concentrically, and the internal contact is provided with an electrode portion,
A screw hole is provided in the external contact, an arrester is inserted from the screw hole, placed on the electrode part, and the arrester is fixed in a contact state with a conductive cap that has a male screw part that is screwed into the screw hole. are doing.

[0003]

By the way, the arrester deteriorates due to the discharge due to overvoltage, so it is necessary to replace it. However, conventionally, the cap is removed and the arrester is picked up with tweezers or the coaxial connector is connected. Since the arrester was dropped upside down, it was difficult to replace the coaxial connector when it was installed on a mountaintop, building rooftop, tower top, or the like.

When mounting an arrester, it is necessary to tighten the cap with a tightening force that is sufficient and does not cause damage in order to reduce the contact resistance at the time of discharge. Or to apply lock paint between the cap and the external contact to prevent loosening, which is troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an arrester mounting structure for a coaxial connector that can easily and surely mount an arrester, and that allows quick and easy replacement of the arrester.

[0006]

In order to achieve the above-mentioned object, an arrestor mounting structure for a coaxial connector according to the present invention comprises a coaxial connector having concentrically insulated internal and external contacts. An electrode portion is provided on the contact, and a screw hole is provided on the external contact, and an arrestor is inserted from the screw hole to abut on the electrode portion, and has a male screw portion screwed into the screw hole. In the arrester mounting structure of the coaxial connector in which the arrestor is tightened and fixed with a cap, an outer peripheral surface having a diameter smaller than a screw hole is formed at a tip side of a male screw portion of the cap, and the outer peripheral surface is formed with a cylindrical holder. The outer peripheral surface of the arrester is fitted and held.

In addition, internal contacts which are insulated from each other
An electrode portion is provided on the internal contact of the coaxial connector having the external contact concentrically, and a screw hole is provided on the external contact, and an arrester is inserted from the screw hole to abut on the electrode portion and the screw hole is provided. In an arrester mounting structure for a coaxial connector in which the arrester is fastened and fixed with a conductive cap having a male screw portion screwed into the screw hole, the cap is provided at the back of the screw hole and at the base end side of the male screw portion. A screw relief portion for preventing excessive tightening of the arrestor, and a resilient member for resiliently urging the arrester toward the cap between the electrode portion and the arrester.

Further, an electrically conductive annular leaf spring is provided between the head portion of the cap and the outer surface of the external contact that come into contact with each other.

In addition, the internal contacts, which are insulated from each other,
An electrode portion is provided on the internal contact of the coaxial connector having the external contact concentrically, and a screw hole is provided on the external contact, and an arrester is inserted from the screw hole to abut on the electrode portion and the screw hole is provided. In the arrester mounting structure of the coaxial connector in which the arrester is tightened and fixed with a conductive cap having a male screw portion screwed into the outer peripheral surface portion having a smaller diameter than the screw hole at the tip side of the male screw portion of the cap. The outer peripheral surface portion and the outer peripheral surface of the arrestor are externally fitted and held by a cylindrical holder, and excessive tightening of the cap is prevented at the deep portion of the screw hole and at the base end side of the male screw portion. And a spring member is provided between the electrode portion and the arrester to urge the arrester toward the cap.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIGS. 1 and 2 (sectional views taken along the line AA in FIG. 1)
1 shows an embodiment (a first embodiment) of an arrester mounting structure for a coaxial connector according to the present invention. Reference numeral 1 denotes an internal contact of the coaxial connector E.
It has an internal intermediate connector 3 and internal end connectors 4 and 4 respectively connected to connection holes provided at both ends of the internal intermediate connector 3 in a plug-in manner. The electrode section 5 is provided at a longitudinally intermediate position of the internal intermediate connector 3. The electrode portion 5 has a shaft portion fitted into a hole provided in the internal intermediate connector 3, and an outer flange-shaped receiving portion and a projection protruding from the center of the receiving portion at the outer end of the shaft portion. And a part 22.

The external contact 2 of the coaxial connector E is inserted into the external intermediate connector 7 having an insertion hole 6 for inserting the internal contact 1 and the insertion hole 6 of the external intermediate connector 7 from both axial sides. And a cylindrical outer end connection body 8. Then, at the connection portions of the internal contact 1 between the internal intermediate connector 3 and the internal end connectors 4, 4, annular insulators 9, 9 are interposed between the external end connectors 8, 8, respectively. By mounting, the external contacts 2 are held in an insulated state concentrically with the internal contacts 1. In addition, 10 and 11 are O-rings provided on the axis P. Further, the external intermediate connector 7 of the external contact 2 is provided with a screw hole 12 penetrating to the insertion hole 6 in a direction orthogonal to the axis P.

As shown in FIGS. 1 to 3 (a sectional view taken along the line BB in FIG. 2), reference numeral 13 denotes the screw hole of the external contact 2.
This is a cap having a male screw portion 14 to be screwed with 12. The cap 13 is made of an electrically conductive material, a groove for inserting a tightening tool is formed on an end surface of the head portion 15, and a projection 16 is provided on an end surface on the male screw portion 14 side. Have been. Further, an outer peripheral surface portion 17 having a diameter smaller than that of the screw hole 12 is formed on the distal end side of the male screw portion.

As shown in FIGS. 1, 2, and 4, an arrester (two-terminal gas arrester) G attached to the coaxial connector E has a circular outer peripheral surface 19 having an outer diameter substantially equal to the outer peripheral surface portion 17 of the cap 13. And a structure in which the electrodes 18 on the bottom surface of the concave portion on both end surfaces are insulated (for example, by ceramic). 1 and 2, etc., the cross-sectional shape of the arrester G is shown in a simplified manner.

As shown in FIGS. 1 to 4, the arrestor mounting structure for a coaxial connector according to the present invention comprises a cylindrical holder 20.
Hold the cap 13 and the arrester G. This cylindrical holder 20 has a plurality of arc-shaped pieces 21 formed by notching a cylindrical body at a plurality of U-shaped portions at a predetermined pitch in the circumferential direction.
Are formed, and the inner diameter thereof is set substantially equal to the outer diameter of the outer peripheral surface 17 of the cap 13 and the outer peripheral surface 19 of the arrester G. The material of the cylindrical holder 20 may be either insulating or conductive.

When the arrester G is mounted on the coaxial connector E constructed as described above, as shown in FIGS. 4 and 5, the outer peripheral surface 17 of the cap 13 is inserted into the hole on the ring 23 side of the cylindrical holder 20. It is integrated by press-fitting or bonding, and the cylindrical holder 20
The outer peripheral surface 19 of the arrester G is fitted into the hole on the side of the arc-shaped piece 21... With an appropriate gripping force, and the cap 13 and the arrester G are fitted and held by the cylindrical holder 20. At this time, the protrusion 16 of the cap 13 is brought into contact with one electrode 18 of the arrester G.

Then, the arrester G is inserted into the screw hole 12 of the external contact 2 and the male screw portion 14 of the cap 13 is screwed into the screw hole 12.
1 and tightened with an appropriate tightening force.
2, the arrestor G is connected to the other electrode 18.
Are in contact with and fixed to the protruding portions 22 of the electrode portions 5 provided on the internal contacts 1. At this time, one end surface of the arrester G is received by the end surface of the cap 13, and the other end surface of the arrester G is received by the outer flange-shaped receiving portion of the electrode portion 5. Note that an O-ring 24 is provided between the head portion 15 of the cap 13 and the external intermediate connector 7 of the external contact.

The arrester G attached to the coaxial connector E in this manner is discharged by application of an induced surge voltage (overvoltage) due to a lightning strike to an antenna feed line or the like, and protects radio equipment and electronic equipment. Since the arrester G is deteriorated by the discharge, it needs to be replaced. At the time of replacement, the arrester G can be taken out together with the cylindrical holder 20 as shown in FIG. 5 by turning the cap 13 in the loosening direction and removing it from the screw hole 12 of the external contact 2. And the cylindrical holder
The arrestor G is removed from 20, the new arrester G is replaced with the cylindrical holder 20, and the cap 13 is tightened to the external contact 2 again to complete the replacement operation.

Next, FIG. 6 shows a second other embodiment of the present invention. In this arrester mounting structure, a screw escape portion 25 is provided in a deep portion of the screw hole 12 provided in the external intermediate connector 7 of the external contact 2, and a base end side (head side) of the male screw portion 14 of the cap 13. Is provided with a screw escape portion 26. That is, a large-diameter inner peripheral surface portion is formed at the back of the screw hole 12, and the screw escape portion in which the male screw portion 14 of the cap 13 idles.
25, and a small-diameter outer peripheral surface portion is formed on the base end side of the male screw portion 14 to form a screw escape portion 26 that is not screwed into the screw hole 12.

The electrode 5 provided on the internal contact 1
A spring member 27 is provided between the arrester G and the arrester G to urge the arrester G toward the cap 13. Specifically, as shown in FIG. 7, the resilient member 27 is a disc spring having a hole at the center, and the protrusion 22 of the electrode unit 5 is inserted into the hole and provided on the outer periphery of the protrusion 22. The inner peripheral edge of the hole is locked by the return portion. Further, an electrically conductive annular leaf spring 29 is provided between the head portion 15 of the cap 13 and the outer surface 28 of the external contact 2 which come into contact with each other.

When the arrester G is mounted on the coaxial connector E according to the present invention, the arrester G is first inserted from the screw hole 12 and placed on the resilient member 27. Then, the male screw portion 14 of the cap 13 is screwed into the screw hole 12 and tightened. Then, the end face of the cap 13 is arrestor G
6, the other end face of the arrester G is pressed against the urging force of the resilient member 27 and
The state shown in FIG.

At this time, when the entire male screw portion 14 of the cap 13 passes through the screw hole 12 and reaches the screw escape portion 25, it turns idle, and the electrode 18 of the arrester G and the protrusion 16
And the contact pressure between the electrode 18 of the arrester G and the protruding portion 22 of the electrode portion 5 are made appropriate, and excessive tightening of the cap 13 is prevented. That is, the arrester G can be tightened and fixed with a sufficient and unbreakable tightening force. Further, the contact between the cap 13 and the external contact 2 is stably ensured by the conductive annular leaf spring 29.

Next, FIG. 8 shows a third embodiment of the present invention. This arrestor mounting structure is such that the cap 13 and the arrester G are externally fitted and held by the cylindrical holder 20, and the screw relief portion 25 is provided at the back of the screw hole 12 of the external contact 2. The screw escape portion 26 is provided on the base end side of the male screw portion 14. Further, the resilient member 27 is provided between the electrode part 5 on the side of the internal contact 1 and the arrester G, and the head part 15 of the cap 13 and the external contact 2 are provided.
The above-mentioned annular leaf spring 29 is provided between the annular leaf spring 29 and the outer surface. That is, the third embodiment is a combination of the first embodiment (described with reference to FIGS. 1 to 5) and the second embodiment (described with reference to FIGS. 6 and 7). It has a structure.

With such a configuration, the work of replacing the arrester G is simplified, the cap 13 can be easily tightened with an appropriate tightening force, and the contact between the cap 13 and the external contact 2 is ensured stably. The advantage can be obtained.

[0025]

Since the present invention is configured as described above, the following effects can be obtained.

(According to claim 1 or 4) The cylindrical holder 20
When the cap 13 is removed from the screw hole 12 of the external contact 2 by externally fitting and holding the cap 13 and the arrester G, the arrester G together with the cylindrical holder 20 can be easily taken out. Therefore, even if the coaxial connector E is installed at a difficult place such as the top of a mountain, the roof of a building, or the top of a steel tower, the arrester G can be replaced quickly and easily.

According to the second or fourth aspect, when the arrester G is attached to the coaxial connector E, the entire male screw portion 14 of the cap 13 passes through the screw hole 12 and reaches the screw escape portion 25. By the way, idle rotation occurs, and the contact pressure between the electrode 18 of the arrester G and the projection 16 of the cap 13 and the contact pressure between the electrode 18 of the arrester G and the projection 22 of the electrode 5 are made appropriate. Proper tightening is prevented. That is, the arrester G can be tightened and fixed with a sufficient and unbreakable tightening force.

According to claim 3, a conductive annular leaf spring is provided.
29 ensures that the contact between the cap 13 and the external contact 2 is stable. In other words, the cap 13 and the external contact 2 are stabilized so as to be able to conduct electricity via the annular leaf spring 29.

[Brief description of the drawings]

FIG. 1 is a half sectional front view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a perspective view showing a cylindrical holder and an arrester.

FIG. 5 is a sectional side view showing a state where an arrester is removed.

FIG. 6 is a cross-sectional side view showing a second embodiment of the present invention.

FIG. 7 is a sectional view of a main part showing a free state of a resilient member.

FIG. 8 is a cross-sectional side view showing a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal contact 2 External contact 5 Electrode part 12 Screw hole 13 Cap 14 Male screw part 15 Head part 17 Outer peripheral surface part 19 Outer peripheral surface 20 Cylindrical holder 25 Screw relief part 26 Screw relief part 27 Resilient member 28 External surface 29 Annular leaf spring E Coaxial connector G Arrester

Claims (4)

[Claims] 1. A coaxial connector having concentrically insulated internal and external contacts provided with an electrode portion on said internal contact, a screw hole on said external contact, and an arrester inserted from said screw hole. The arrestor mounting structure of the coaxial connector in which the arrester is fixed by tightening the arrester with a conductive cap having an external thread portion that is in contact with the electrode portion and is screwed into the screw hole. A arrester mounting structure for a coaxial connector, characterized in that an outer peripheral surface portion having a diameter smaller than a screw hole is formed at the tip end of the arrestor, and the outer peripheral surface portion and the outer peripheral surface of the arrester are externally fitted and held by a cylindrical holder. 2. A coaxial connector having concentrically insulated internal and external contacts, an electrode portion is provided on said internal contact, a screw hole is provided on said external contact, and an arrester is inserted from said screw hole. In the arrester mounting structure of the coaxial connector in which the arrester is fixed by tightening the arrester with a conductive cap having an external thread portion screwed into the screw hole while being in contact with the electrode portion, And a screw escape portion for preventing excessive tightening of the cap is provided on the base end side of the male screw portion, and a resilient device is provided between the electrode portion and the arrester to resiliently bias the arrester toward the cap. An arrester mounting structure for a coaxial connector, comprising a member. 3. The arrester mounting structure for a coaxial connector according to claim 2, wherein a conductive annular leaf spring is provided between a head portion of the cap and an outer surface of the external contact that come into contact with each other. 4. A coaxial connector having concentrically insulated internal and external contacts, an electrode portion is provided on said internal contact, a screw hole is provided on said external contact, and an arrester is inserted from said screw hole. The arrestor mounting structure of the coaxial connector in which the arrester is fixed by tightening the arrester with a conductive cap having an external thread portion that is in contact with the electrode portion and is screwed into the screw hole. An outer peripheral portion having a smaller diameter than the screw hole is formed on the tip side of the screw hole, the outer peripheral surface portion and the outer peripheral surface of the arrester are externally fitted and held by a cylindrical holder, and the inner portion of the screw hole and the outer peripheral portion of the male screw portion are formed. At the base end side, a screw relief portion for preventing excessive tightening of the cap is provided, and a resilient member for resiliently urging the arrester toward the cap between the electrode portion and the arrester. An arrester mounting structure for a coaxial connector characterized by being provided.