JP3056940B2 - Grounding terminal for coaxial cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground terminal attached to a coaxial cable.

[0002]

2. Description of the Related Art In general, a ground terminal is attached to a coaxial cable serving as an antenna feed line in order to protect a communication device from a lightning surge or the like. FIG. 7 shows a conventional ground terminal. The grounding terminal 50 includes a contact band 51 made of a plain woven copper wire and a clamp member 52 for crimping the contact band 51 to the outer conductor 101 of the coaxial cable 100. The contact band 51 is wound around the outer conductor 101 of the coaxial cable 100 after the contact band 51 is peeled off over the entire circumference of the coaxial cable 100, and the contact band 51 is further wound.
The contact band 51 is connected and fixed to the external conductor 101 by tightening the coaxial cable 100 with the clamp member 52 from above. A ground wire 54 is connected to the contact band 51 via an external connection portion 53, whereby the external conductor 101 of the coaxial cable 100 is grounded. The connection portion of the coaxial cable 100 to which such a ground terminal 50 is attached is covered with a coating 10.
2 is stripped over the entire circumference, and it is necessary to newly provide a waterproof structure here. Therefore, in the grounding terminal 50, the grounding terminal 50 and the whole connection site are covered with the moisture-proof compound 55, and the butyl rubber tape 56 and the adhesive P
By sequentially winding the VC tape 57, the ground terminal 5
0 is protected by waterproofing.

However, the ground terminal 50 has the following problem. That is, in order to wind and fix the contact band 51 around the outer conductor 101, the coaxial cable 1
It is necessary to peel off a part of the coating 102 of the 00 over the entire circumference, and the operation is troublesome. In order to peel off the coating 102 largely over the entire circumference, the work of covering the part again and making it watertight is required. That is, the work of covering with the moisture-proof compound 55 and winding with the tape 56 takes a lot of trouble.
The contact band 51 is made of a plain woven copper wire, and such a plain woven copper wire is connected to a member to be connected (the outer conductor 101, the clamp member 52) by point contact. Since the copper wires constituting the copper wires are in point contact with each other, the contact resistance increases.

Accordingly, the present applicant has proposed a ground terminal for a coaxial cable shown in FIG. This ground terminal 60 is
A pair of clamp members 62A and 62B are provided so as to sandwich and connect the coaxial cable 100. Clamp member 6
On one of 2A and 62B, there is provided a contact member 63 penetrating through the inner and outer ends of the clamp member 62A and elastically biased inward. Further, at the inner end of the contact member 63, an adhesive surface 64 having a shape which is in close contact with the surface of the outer conductor 101 of the coaxial cable 100 is formed. Then, the clamp member 62A
An annular sealing member 67 is disposed on the inner end surface 65 of the inner peripheral surface 65 so as to surround the contact member projecting opening 66.

The above-mentioned problem has been solved by the ground terminal 60 configured as described above. That is, since it is only necessary to peel off the coating 102 of the coaxial cable 100 only at the portion where the contact member 63 abuts, the coating stripping operation is facilitated, and the mounting work of the ground terminal 60 is also facilitated accordingly. , 'The coating stripping portion is reduced in size, and the coating stripping portion is reliably waterproofed by the sealing member 67. Therefore, there is no need to provide a separate waterproof structure, and the ground terminal 60 is further reduced. Since the contact member 63 is elastically crimped to the external conductor 101, the connection between the two is made secure and the contact resistance is reduced.

[0006]

However, the ground terminal 60 for a coaxial cable thus improved has a problem to be improved. That is, in order to connect and fix the contact member 63, a plurality (a pair) of clamp members 62A,
62B, and these clamp members 62A,
62B must be firmly connected to each other, and for such a reason, the structure of the ground terminal 60 is enlarged, and the coaxial cable 100 that is multi-layer laid (a plurality of coaxial cables 100 are bundled and arranged) is used. On the other hand, there is a problem that the mounting is difficult.

Further, the number of components constituting the ground terminal 60 increases, and the number of components increases accordingly, resulting in a problem that the cost is increased.

Accordingly, it is an object of the present invention to provide a grounding terminal that can be easily mounted and that can be reduced in size.

[0009]

In order to achieve the above object, a ground terminal according to the present invention comprises: a main body member surrounding an exposed outer conductor and abutting on a peripheral surface of a coaxial cable; A contact member formed through the inner and outer ends of the member and elastically biased inward, and having an adhesive surface formed at the inner end thereof so as to be in close contact with the outer conductor surface; An annular sealing member disposed around the contact member projecting opening on the inner end face,
And a connecting band for binding and fixing the main body member to the coaxial cable.

[0010] It is preferable that an engaging groove for abutting the connecting band is formed on the outer peripheral surface of the main body member.

Further, at the upper end of the side wall of the engaging groove,
It is preferable that the projection for preventing the connection band from coming off is formed inward in the width direction of the engagement groove.

[0012]

According to the above construction, since the main body member is tightly fixed to the coaxial cable by the connecting band, the fixing structure of the main body member is simple and small.

[0013] Further, if an engagement groove is formed on the outer peripheral surface of the main body member so as to make the connecting band body abut, the connecting band body does not deviate from the main body member.

Further, if a projection for preventing the connection band from coming off is formed at the upper end of the side wall of the engagement groove toward the inside in the width direction of the engagement groove, the connection band is engaged in the connection groove. Will be stopped.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments shown in the drawings. FIG. 1 is a cross-sectional view of a ground terminal according to a first embodiment of the present invention, FIG. 2 is a side view, and FIG. 3 is an enlarged view of a main part of a connection portion.

The grounding terminal 1 is attached to a coaxial cable 100 having an outer conductor 101 made of a copper tube with a ring-shaped wave, and includes a main body member 2 and a connecting band (corresponding to a connecting band in the claims). 3 is provided. The main body member 2 is a curved plate-shaped metal fitting (for example, a stainless steel metal fitting).
, And the inner end surface 4 has a shape substantially in contact with the peripheral surface of the coaxial cable 100.

The central portion of the main body member 2 projects outward, and the projecting portion 5 is formed with an insertion hole 6 penetrating the main body member 2 inside and outside. The insertion hole 6 is formed along the radial direction of the coaxial cable 100 to be clamped.
A rod-shaped contact member 7 made of a conductor is penetrated through the insertion hole 6. The contact member 7 is made of, for example, a material in which a surface of a bronze casting is subjected to silver plating. The insertion hole 6 has a step 8 formed on the inner end face 4 side, and a leaf spring 9 is provided in the step 8. The contact member 7 is moved by the leaf spring 9 to the inner end face 4 side, that is, the coaxial cable 100.
It is elastically biased to the side.

The inner end of the contact member 7 projects from the opening 10 on the inner end surface side of the insertion hole 6.
Has an adhesive surface 11 formed at the inner end thereof. The bonding surface 11 is formed with irregularities so as to be in close contact with the ring-shaped wave shape of the external conductor 101. An external connection terminal portion 13 is attached to an outer end of the contact member 7 protruding outside from the outer opening 12 of the insertion hole 6.
Is connected to a ground wire (not shown). A ring gasket (corresponding to a sealing member in the claims) 15 is provided on the inner end surface 4 of the main body member 2. The ring gasket 15 is made of, for example, silicone rubber, and is disposed so as to surround the opening 10 on the inner end surface side of the insertion hole 6. A ring-shaped recess 16 is provided on the inner surface of the ring gasket 15.
By providing the sealing member 6, sealing portions are formed at both ends in the radial direction of the concave portion 16. Therefore, the ring gasket 15 has a double sealing structure, and the sealing effect is high.

Further, an O-ring mounting groove 16 is formed in the middle of the insertion hole 6.
An O-ring 17 for closing a gap formed between the contact member 7 and the main body member 2 in the insertion hole 6 is provided therein. The O-ring 17 is made of, for example, neoprene rubber.

Engaging grooves 18 are provided on the outer peripheral surfaces at both ends in the width direction of the main body member 2. The engagement groove 18 has a constant width and is formed along the bending direction of the main body member 2. Further, protrusions 19 are provided at the upper ends of both side walls of the engagement groove 18 as shown in FIG. The projection 19 is formed so as to protrude inward in the width direction of the engagement groove 18, and is provided over the entire circumference of the engagement groove 18.

The connecting band 3 has a band body 20 having a width slightly smaller than the engaging groove 18. The band body 20 is made of a metal ribbon (for example, a stainless steel ribbon).
A plurality of connection holes 21 formed at the same pitch in the length direction are formed, and a buckle 22 is attached to one end thereof. Then, the band body 20 is
By being inserted into the engagement groove 18 through a gap between the end projection 19 and the bottom surface of the engagement groove 18, it is arranged to be in contact with the engagement groove 18. For this reason, the band body 20 is prevented from coming out of the engagement groove 18 by the projections 19 located on both upper sides thereof.

The other end of the band body 20 placed in contact with the engagement groove 18 in this manner is inserted through the buckle 22, and the connection hole 21 is engaged with an engagement claw (not shown) built in the buckle 22. By joining, the both ends are connected in a ring shape, and furthermore, the other end side of the band body 20 is pulled to move the connection position with the connection hole 21 so that the band body 20 can be connected at the time of connection. The diameter can be adjusted.

In the figure, reference numeral 102 denotes the coaxial cable 10.
Reference numeral 103 denotes an inner conductor of the coaxial cable 100;
Reference numeral 04 denotes an insulator provided between the inner conductor 104 and the outer conductor 101.

Next, the ground terminal 1 is connected to the coaxial cable 10.
The step of attaching to 0 will be described. First, coaxial cable 1
The coating 102 at the center of the peripheral surface of the contact member 100 is peeled off to a degree slightly larger than the bonding surface 14 of the contact member 10. This coating stripping operation is performed using the stripping tool 30 shown in FIG. That is, the stripping tool 30 is provided with a center guide pin 32 and a cutter blade 33 at the tip of the handle 31, and the handle 31 is inserted into the sheath 102 of the coaxial cable 100 with the center guide pin 32 pierced. By rotating, the coating 102 is cut by the cutter blade 33 into a circle slightly larger than the bonding surface 11.

The coaxial cable 1 is removed by the stripping tool 30.
After the coating 102 of the 00 is peeled off in a circle, the main body member 2 in a state where the connection of the band body 20 is released is applied to the coating stripping portion of the coaxial cable 100. At this time, the main body member 2 is arranged so that the adhesive surface 11 of the contact member 7 comes into contact with the coating stripping portion. Coaxial cable 10
0 is applied to the main body member 2, and then the other end of the band body 20 is inserted into the buckle 22 and tightened.
0 is tightly fixed to the peripheral surface of the coaxial cable 100. The work of fastening the band body 20 can be performed relatively easily because the band body 20 is locked in the engagement groove 18 by the projection 19 and does not fall off. In addition, the tightened band body 20 is not displaced from the main body member 2 because the band body 20 is engaged with the engagement groove 18.

When the grounding terminal 1 is fixed to the coaxial cable 100 in this manner, the contact member 7 is pressed against the coaxial cable 100 by the elastic force of the leaf spring 9, and the bonding surface 11 of the contact member 7 is coaxial. Both are securely connected to the outer conductor 101 of the cable 100 in close contact. At this time, the elastic contact force of the contact member 10 is adjusted by the elastic repulsive force of the leaf spring 9, so that the disadvantage that the elastic contact force of the contact member 7 is too strong and the outer conductor 101 is deformed does not occur.

Further, by connecting the main body member 2 and the connecting band 3, the ring gasket 15 is brought into close contact with the coating 102 around the coating stripping portion, so that the coating stripping portion is sealed by the ring gasket 15. ,
There is no invasion of moisture or moisture from the outside. In addition,
The gap between the insertion hole 6 and the contact member 7 is the O-ring 1
7, so that moisture, moisture and the like do not enter from here.

Further, the main body member 2 is provided with a contact member 7.
Are slightly arranged in the coaxial cable 10.
0, the main body member 2 is simply formed of a thin metal plate along the peripheral surface of the coaxial cable 100, and the main body member 2 is further attached to the coaxial cable 100. The connecting band 3 to be connected is made of a metal ribbon. Therefore, the grounding terminal 1 has a shape that hardly protrudes outward in the radial direction of the coaxial cable 100. Even when the grounding terminal 1 is attached to the coaxial cable 100, the grounding terminal 1 does not protrude much around the coaxial cable 100. It hardly gets in the way.

Next, a second embodiment of the present invention will be described. As shown in FIG. 6, the ground terminal 40 of this embodiment has the same basic structure as that of the first embodiment, and the same or similar parts are denoted by the same reference numerals. Detailed description is omitted.

The grounding terminal 40 is characterized by the structure of the connecting band 41. That is, the connection band 41 is formed of a metal band plate (for example, a stainless steel band) having a curved shape along the peripheral surface of the coaxial cable 100, and one end thereof is connected to one end side of the main body member 2. The connecting band 41 is thinner than the main body member 2 and can be deformed. The other end of the connection band 41 is bent outward, and a connection hole 43 is formed in the bent portion 42. On the other hand, the other end of the main body member 2 is provided with a flange 44 extending outward, and a female screw hole 45 is formed in the flange 44. The connection band 41 is connected to the main body member 2 by screwing the connection bolt 46 engaged with the connection hole 43 into the female screw hole 45 of the main body member 2.

Next, the ground terminal 40 is connected to the coaxial cable 10.
The step of attaching to 0 will be described. First, similarly to the first embodiment, the coating 102 at the center of the peripheral surface of the coaxial cable 100 is attached to the bonding surface 11 of the contact member 7 using the stripping tool 30.
Peel off slightly larger.

After the sheath 102 of the coaxial cable 100 has been stripped, the main body member 2 is applied to the stripped portion of the coaxial cable 100. At this time, the main body member 2 is arranged so that the adhesive surface 11 of the contact member 7 comes into contact with the coating stripping portion. After applying the coaxial cable 100 to the main body member 2, the connecting band 41 is connected to the coaxial cable 100.
And wrap it around. Then, the connecting bolt 46 inserted from the connecting band 41 side into the connecting hole 43 is screwed into the female screw hole 45, and the connecting band 41 and the main body member 2 are connected and tightened, thereby connecting the main body member 2 to the coaxial cable. 100 is fixed to the peripheral surface. The structure in which the contact member 7 of the ground terminal 40 tied to the coaxial cable 100 is connected to the external conductor 101 is the same as that of the first embodiment, and a description thereof will be omitted.

Although the grounding terminal 40 has a shape slightly protruding radially outward of the coaxial cable 100 because the flange 44 for connecting the connecting band is provided on the main body member 2, the connecting band 41 is simply formed on the coaxial cable 100. And has a shape that hardly projects outward in the radial direction of the coaxial cable 100. Therefore, even when attached to the coaxial cable 100, it does not protrude much around the coaxial cable 100, and hardly hinders the installation environment of the coaxial cable 100.

[0034]

As described above, according to the present invention, the following effects can be obtained. That is, the grounding terminal can be mounted and waterproofed only by fastening the main body member to the coaxial cable with the connecting band, so that the mounting structure of the grounding terminal is simplified and the size can be reduced accordingly.

Accordingly, it is possible to easily attach the coaxial cable to the coaxial cable in which the space for attaching the ground terminal is reduced by arranging the multiple wires.

Further, since the grounding terminal can be constituted by a small number of components such as a main body member provided with a contact member and a connecting band, the number of components is reduced and the cost is reduced.

Further, when the engaging groove for abutting the connecting band is formed on the outer peripheral surface of the main body member, the connecting band does not deviate from the main body member. There is an effect that it becomes certain.

Furthermore, by forming a projection on the upper end of the side wall of the engaging groove toward the inside in the width direction of the engaging groove, the connecting band is locked in the connecting groove. As a result, the connecting strip does not fall out of the main body member during the mounting operation, which makes it difficult to perform the operation, and accordingly, there is an effect that the mounting workability of the ground terminal is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a ground terminal according to a first embodiment of the present invention.

FIG. 2 is a side view of a ground terminal according to the first embodiment.

FIG. 3 is an enlarged view of a main part of a connection point of a ground terminal according to the first embodiment.

FIG. 4 is an enlarged sectional view of a main part showing a support structure of a connection band body in a ground terminal of the first embodiment.

FIG. 5 is a side view of a jacket stripping tool used in the first and second embodiments.

FIG. 6 is a cross-sectional view illustrating a configuration of a ground terminal according to a second embodiment of the present invention.

FIG. 7 is a sectional view showing a configuration of a first conventional example.

FIG. 8 is a sectional view showing a configuration of a second conventional example.

[Explanation of symbols]

 2 Body Member 3 Connecting Band 7 Contact Member 10 Inner End Side Opening of Insertion Hole 11 Adhesive Surface 15 Ring Gasket 100 Coaxial Cable 101 External Conductor

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takayoshi Kanda 4-3 Ikejiri, Itami-shi, Hyogo Mitsubishi Electric Wire Industry Co., Ltd. Itami Works (72) Inventor ▲ Motai ▼ Rennosuke 1 Aoki, Kawaguchi-shi, Saitama No. 7-11, Sanei Electric Industry Co., Ltd. (72) Inventor Akio Kusui 1-7-11, Aoki, Kawaguchi City, Saitama Prefecture Inside Sanei Electric Industry Co., Ltd. (56) References , U) Japanese Utility Model Application Sho 56-152078 (JP, U) Patent 2985159 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01R 4/64, 17/04

Claims (3)

(57) [Claims] 1. A coaxial cable grounding terminal connected to an exposed outer conductor by stripping a coating of a coaxial cable, wherein the main body surrounds the exposed outer conductor and abuts on a peripheral surface of the coaxial cable. A contact member that is disposed through the inner and outer ends of the main body member and is elastically urged inward, and has an adhesive surface having a shape that is in close contact with the outer conductor surface at the inner end thereof; An annular sealing member disposed so as to surround a contact member projecting opening on an inner end surface of the main body member; and a connecting band body for binding and fixing the main body member to a coaxial cable. Ground terminal for cable. 2. The grounding terminal for a coaxial cable according to claim 1, wherein an engagement groove for abutting said connecting band is formed on an outer peripheral surface of said main body member. 3. A projection for preventing the connection band from coming off is formed at an upper end of a side wall portion of the engagement groove toward an inner side in a width direction of the engagement groove. Ground terminal for coaxial cable.