JPH0512942Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a system in which coaxial cables of different diameters, such as a power feeding coaxial cable for an automobile antenna and a relay coaxial cable for a transmitting/receiving set, are integrated by a connecting part. This invention relates to coaxial cable connectors of different diameters that are connected to each other, and particularly to improvements in the structure of the connector.

[Conventional technology]

A conventional coaxial cable connection body of this type with different diameters has a structure as shown in FIG. Reference numeral 10 denotes a coaxial cable for feeding power to an automobile antenna, which normally has an outer diameter of φ7. 20 is a relay coaxial cable, which normally has an outer diameter of φ5.
11 and 21 are the outer conductors of each cable 10 and 20, respectively, and 12 and 22 are the outer conductors of each cable 1
Hollow internal insulating tubes 0 and 20 protrude from the center, respectively; 13 and 23 are center conductors inserted into the hollow internal insulating tubes 12 and 22; 30 is the internal insulating tube 12,
An insulating vinyl chloride tube is disposed to cover the protruding portion of 22, 31 is a conductive earth sleeve, 32 is a heat shrink tube, and 33 is a collar.

The operation for connecting the coaxial cables 10 and 20 is performed as follows. First, each cable 10, 20
By cutting off the external insulating tube to a predetermined length, the external conductors 11 and 21 made of braided wire are exposed, and then folded back to the outer peripheral surface of the external insulating tube. Then, the center conductors 13 and 23 are pulled out from the hollow portions of the internal insulating tubes 12 and 22 that protrude from the center of each cable 10 and 20, respectively.
The ends are soldered together to form a connection point P. In order to protect this connection point P, an insulating vinyl chloride tube 30 is placed over the entire protruding portions of the internal insulating tubes 12 and 22. and,
A conductive earthing sleeve 31 is placed so as to cover the outer periphery of the insulating vinyl chloride tube 30 and the outer peripheries of the external conductors 11 and 22. Then, the portion of the earth sleeve 31 that covers the outer conductors 11 and 21 is punched at about four locations to establish electrical and mechanical connection between the outer conductors 11 and 21. Finally, a heat-shrinkable tube 32 is placed over the entire connection including the grounding sleeve 31, and heat-shrinked to protect the entire connection. Note that since both cables 10 and 20 have different wire diameters, when covered with a cylindrical ground sleeve 31 having a uniform diameter, the folded part of the outer conductor 21 of the small diameter coaxial cable 20 and the inner surface of the ground sleeve 31 There will be a gap between the two. In order to compensate for this point, the outer conductor 21 of the coaxial cable 20
The folding operation is performed by interposing a short cylindrical collar 33 as shown by a broken line in the folded portion.

[The problem that the idea attempts to solve]

In the conventional coaxial cable connector having the above-mentioned structure, a vinyl chloride tube 30 needs to be inserted as shown in the figure in order to protect the connection point P where the center conductors 13 and 23 are soldered. Therefore, not only is the structure complicated, but the operation is extremely complicated, and the vinyl chloride tube 30 must be prepared separately, resulting in high costs. On the other hand, since the internal insulating tubes 12 and 22 face each other across the connection point P, the length of the entire connection portion is relatively long. Accordingly, the length of the earthing sleeve 31 and the heat-shrinkable tube 32 also need to be long, which also increases the material cost. Furthermore, in the structure described above, after the collar 33 is attached, the outer conductor 21
Since it is necessary to perform a folding operation, the work becomes complicated in this respect as well, and furthermore, it is necessary to separately prepare the collar 33, which increases the cost.

Therefore, the purpose of the present invention is to provide a different diameter coaxial cable connector that is extremely easy to connect, requires fewer parts, and can shorten the length of the connector, resulting in significant cost reductions. shall be.

[Means to solve the problem]

The present invention takes the following measures to solve the above problems and achieve the purpose.

A large-diameter coaxial cable with a structure in which the center conductor is loosely inserted into an internal insulating tube, and a small-diameter coaxial cable in which both the internal and external insulating tubes have smaller diameters than the large-diameter coaxial cable. , a connecting portion that integrally connects the small-diameter coaxial cable and the large-diameter coaxial cable, and the large-diameter coaxial cable has the connecting portions connected to each other. and a center conductor of the small-diameter coaxial cable, and an internal insulating tube at the connection end of the small-diameter coaxial cable, in a hollow part of the internal insulating tube at the connection end of the large-diameter coaxial cable, so as to surround the outer periphery of the center conductor. an inner insulating tube fitting portion formed by inserting the inner insulating tube, and a connection between the outer conductor of the larger diameter coaxial cable folded back onto the outer peripheral surface of the outer insulating tube at the connection end of the larger diameter coaxial cable and the smaller diameter coaxial cable. The outer conductor of the small-diameter coaxial cable is folded back onto the outer peripheral surface of the outer insulating tube at the end, and the outer conductor of the large-diameter coaxial cable coaxially surrounds the fitting part of the inner insulating tube, and the large-diameter side is the outer conductor of the large-diameter coaxial cable. The small-diameter side is connected and fixed to the outer conductor of the small-diameter side coaxial cable, and the outer conductors are electrically connected to each other, and the fitted state of the fitting portion is mechanically checked. A conductive sleeve is provided to fix and hold the conductive sleeve, and has a stepped portion with a different diameter in the middle. It consists of an insulated tube that is tightly fixed with a

[Effect]

By taking such measures, the following effects occur. The fit between the internal insulating tubes, ie the internal insulating tubes themselves, protects the central conductor at the cable connection. As a result, it is possible to eliminate the conventionally required vinyl chloride tube for protecting the connection point. Therefore, there is no need to perform complicated operations, and the number of parts can be reduced, resulting in cost reduction. Furthermore, since the internal insulating tubes are fitted into each other, the length of the connecting portion can be shortened, and the length of the earthing sleeve and heat shrink tube can be shortened, so material costs can also be reduced in this respect. Furthermore, since the vinyl chloride tube can be eliminated, there is no need to make the entire connection part the same outer diameter. As a result, the number of colors that were previously required can be reduced. Therefore, in this respect as well, the number of parts and costs can be reduced.

〔Example〕

FIG. 1 is a sectional view showing an embodiment of the present invention. The same parts as in Fig. 3 are given the same reference numerals.
Detailed explanation will be omitted.

As shown in FIG. 1, inside the hollow part of the internal insulating tube 12 at the connecting end of the large diameter coaxial cable 10, which is a power supply cable for an automobile antenna, there is internal insulation at the connecting end of the small diameter coaxial cable 20, which is a relay cable. The outer peripheral portion of the tube 22 is inserted by a predetermined length L to form a fitting portion. In the case of this embodiment, both the internal insulating tubes 12 and 22 have a hollow pipe shape, into which the center conductor is loosely inserted (loosely inserted with an appropriate play to the extent that it can easily slide). (referring to the state of being) Therefore, as the center conductor, by sliding either the center conductor 13 of the large-diameter side coaxial cable 10 or the center conductor 23 of the small-diameter side coaxial cable 20 as it is inside the hollow part of the internal insulating tubes 12, 22, It passes through both tubes 12, 22 in common to form a single center conductor. In this case, even if the center conductor is relatively long, about 3 to 5 meters long, with this type of coaxial cable, the center conductor can be passed through the hollow part of the internal insulating tube without much trouble. It has been confirmed that there is no problem since it can be slid. Thus, in the above case, the central conductors 13, 2
There is no need to solder the three together. Of course, the center conductor may be connected in the same manner as in FIG. The conductive earthing sleeve 31' is made of two parts having different diameters and having a different diameter step part 34 in the middle by drawing as shown in the drawing. This earth sleeve 31' is
The large-diameter side is used as the large-diameter coaxial cable 10 side, and the small-diameter side is used as the small-diameter coaxial cable 20 side. Therefore, there is no need to use the conventionally used collars. In addition, conductive earth sleeve 3
1' has the function of electrically connecting the outer conductors 11 and 21, as well as mechanically coupling the two cables, and mechanically fixing and maintaining the fitted state of the fitting portion. ing.

According to the connection mechanism of this embodiment configured in this way, the center conductor 13 or 23 at the cable connection portion is protected by the fitting portion between the internal insulating tubes 12 and 22, that is, by the internal insulating tube itself. It turns out. As a result, it is possible to eliminate the conventionally required vinyl chloride tube for protecting the connection point. Therefore, there is no need to perform complicated operations, and the number of parts can be reduced, resulting in cost reduction. In addition, in this embodiment, the center conductor 1
Since it is not necessary to solder 3 and 23, it is possible to avoid conduction failure at the center conductor connection point. Further, since the internal insulating tubes 12 and 22 are fitted into each other, the length of the connecting portion can be shortened. Therefore, the earthing sleeve 31'
and the length of the heat shrink tube 32 can be shortened.
In this respect as well, material costs can be reduced. Furthermore, since the vinyl chloride tube can be eliminated, there is no need to make the entire connection part the same outer diameter. And a different diameter earth sleeve 31' having a different diameter step part 34.
By using , it is possible to reduce the number of colors that were previously required. Therefore, in this respect as well, the number of parts and costs can be reduced.

FIG. 2 is a sectional view showing another embodiment of the present invention. This embodiment is an example of application in a case where the internal insulating tube 22 of the small-diameter coaxial cable 20 is not hollow. In this embodiment, the center conductors 13 and 2
3 is soldered to form a connection point P, and then the outer peripheral part of the internal insulating tube 22' is inserted into the hollow part of the internal insulating tube 12, thereby achieving the same mode as the previous embodiment. It is.

In this way, in this embodiment, the center conductor 1
The only difference from the previous embodiment is that soldering No. 3 and 23 is performed, and other than the above-mentioned points, this embodiment is completely the same as the previous embodiment. Therefore, it goes without saying that the same effects as those of the embodiment described above can be achieved.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[Effect of idea]

According to the present invention, the outer periphery of the internal insulating tube at the connecting end of the small diameter coaxial cable is inserted into the hollow part of the internal insulating tube at the connecting end of the large diameter coaxial cable to form a fitting part. In addition to protecting the center conductor of the coaxial cable and small-diameter coaxial cable, the conductive sleeve with different diameter steps provides electrical connection between the outer conductors and mechanical connection between the two cables, which was previously unnecessary. The PVC tube used to protect the connection point can be removed, making the connection operation extremely easy, requiring fewer parts, and shortening the length of the connection, resulting in significant cost reductions. It is possible to provide a coaxial cable connection body of different diameters that can be measured.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the structure of one embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the structure of another embodiment of the present invention. FIG. 3 is a sectional view showing the configuration of a conventional example. 10...Coaxial cable for power feeding of automobile antenna (large diameter coaxial cable), 20... Coaxial cable for relay (small diameter coaxial cable), 11, 21... External conductor, 12, 22... Hollow internal insulation Tube, 22'...Solid internal insulating tube, 13,
23... Center conductor, 30... Insulating vinyl chloride tube, 31... Conductive earth sleeve, 3
1'... Conductive earth sleeve with different diameter, 32...
Heat shrink tube, 33...color.

Claims (1)

[Scope of Claim for Utility Model Registration] A large-diameter coaxial cable having a structure in which the center conductor is loosely inserted into an internal insulating tube, and a diameter of the internal insulating tube and external insulating tube that is larger than that of the large-diameter coaxial cable. A small-diameter coaxial cable, each of which has a small diameter, and a connecting portion that integrally connects the small-diameter coaxial cable and the large-diameter coaxial cable, and the connecting portions are connected to each other. a center conductor of the large-diameter coaxial cable and a small-diameter coaxial cable; an internal insulating tube fitting portion formed by inserting an internal insulating tube at the connecting end; an external conductor of the large-diameter coaxial cable folded back onto the outer peripheral surface of the external insulating tube at the connecting end of the large-diameter coaxial cable; The outer conductor of the small-diameter coaxial cable folded back onto the outer peripheral surface of the external insulating tube at the connection end of the small-diameter coaxial cable coaxially surrounds the fitting portion of the internal insulating tube, and the large-diameter side is connected to the large-diameter tube. The side coaxial cable is connected and fixed to the outer conductor of the small diameter side coaxial cable, and the small diameter side is connected and fixed to the outer conductor of the small diameter side coaxial cable, and the outer conductors are electrically connected to each other, and the fitting part of the fitting part is connected and fixed. a conductive sleeve having a stepped portion with different diameters in the middle, which is provided so as to mechanically fix and maintain the mating state; and the conductive sleeve is fitted to cover the large diameter coaxial cable and the small diameter coaxial cable. A different diameter coaxial cable connection body comprising: an insulated tube tightly fixed to the outer circumferential surface of the cable;