JP3074864U - High frequency coaxial plug - Google Patents

Abstract

(57) [Problem] To provide a coaxial plug capable of maintaining a good contact state between an external contact and a connection nut even during connection work. SOLUTION: An internal insulator 102 of a coaxial cable 100 is provided.
Part 210b inserted between the wire and the braid 103, and a folded part 210 covering the outer skin at the end of the coaxial cable.
b, an external contact 210 connected to the outer conductor of the coaxial cable, and an inner periphery threaded, one end fitted into the end of the external contact, and the other end open. A high-frequency coaxial plug having a connection nut 230 and having a core of the coaxial cable as a central conductor, and forming an outer conductor with the external contact and the connection nut to form a coaxial plug; A high-frequency coaxial plug, characterized in that a spring conductive member 250 is interposed in the abutting portion with the plug.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a high-frequency coaxial plug in which an outer conductor is formed by external contacts and connection nuts inserted into the braid of a coaxial cable, and a coaxial plug is formed by using a core of the coaxial cable as a center conductor.

[0002]

[Prior art]

 A conventional coaxial cable plug as shown in FIG. 5 is widely used. This uses the core wire 101 of the coaxial cable 100 as the center conductor of the plug, and inserts the cylindrical portion of the external contact between the inner insulator 102 and the braid 103 at the end of the coaxial cable to form a coaxial cable. The outer contact 22 is fixed to the coaxial cable 100 by covering the sleeve 22 from above with the outer sleeve and clamping it with a tool such as pliers, and the base end of the connection nut 23 is rotatable at the end of the outer contact 22. It becomes a plug by fixing.

FIG. 6 shows a state in which the coaxial plug shown in FIG. 5 is connected to a coaxial receptacle. In FIG. 6, the left side shows a coaxial plug, and the right side shows a single state in which the coaxial receptacle 300 is not assembled to the device. The coaxial receptacle 300 is formed by fixing a cylindrical case composed of a pair of members 302 and 303 accommodating a center conductor 301 in an outer conductor 304 whose outer periphery is threaded.

As shown in FIG. 6, the coaxial plug is fixed by tightening a connection nut 23 of the coaxial plug into a screw provided on the outer periphery of the outer conductor 304 of the coaxial receptacle 300. As described above, the connection nut 23 of the coaxial plug in the middle of the tightening is rotatable with respect to the external contact 21 and is connected to the external contact 21 so as to be able to swing to some extent.

[0005]

[Problems to be solved by the invention]

 Such a state occurs because the coaxial plug is engaged with the external contact 21 and the connection nut 23 with a certain margin or gap.

[0006] As a result, when performing construction for a new subscriber or construction for Internet subscription in a CATV system, the outer conductor is intermittently connected even if the center conductor is connected. State. As a result, external noise enters the connection portion between the coaxial plug and the coaxial receptacle, and the intermittent connection between the external contact 21 and the connection nut 23 occurs, thereby causing noise. There is.

As shown in FIG. 7, there is a coaxial plug in which a contact spring 24 is mounted near the inner peripheral end of the connection nut 23 to improve the state of contact with the coaxial receptacle. It does not improve the contact state between the contact and the connection nut.

The present invention has been made in consideration of the above points, and has as its object to provide a coaxial plug that can maintain good contact between an external contact and a connection nut even during connection work. .

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a plug portion inserted between the inner insulator of the coaxial cable and the braid, and a folded portion covering the outer skin at an end of the coaxial cable. An external contact connected to the outer conductor of the coaxial cable, and a connection nut threaded on the inner periphery, one end of which is fitted to the end of the external contact, and the other end of which is open; In a high-frequency coaxial plug in which a core conductor of a coaxial cable is used as a central conductor and an outer conductor is formed by the external contact and the connection nut to form a coaxial plug, a spring is provided at a contact portion between the external contact and the connection nut. A high-frequency coaxial plug, wherein a conductive conductive member is interposed.

[0010]

[Embodiment of the invention]

 FIG. 1 is a partial sectional view of an embodiment of the present invention. In FIG. 1, the coaxial cable 100 is indicated by using the same reference numerals as those in FIGS. 5 to 7, and the external contacts and the connection nuts are basically added to the end of the reference numerals in FIGS. 5 to 7. It is shown as a three-digit code with 0 added.

Therefore, the external contact 210 corresponds to the external contact 21 in FIG. 5 and the like, the plug sleeve 220 corresponds to the plug sleeve 22 in FIG. 5 and the like, and the connection nut 230 corresponds to the connection nut 23 in FIG. Is equivalent to The contact spring 250 is different from the contact spring 24 in FIG. 7 in that the contact spring 250 is not provided on the inner periphery of the connection nut 23 but is inserted between the external contact 210 and the connection nut 230.

Here, the relationship between the coaxial cable 100 and the external contact 210 will be described again as follows.

The inner insulator 102 that holds the coaxial cable 100 between the core wire 101 and the braid 103 in a coaxial relationship has substantially the same diameter as the inner periphery of the outer contact 210, and the outer periphery of the inner insulator 102. The cylindrical part of the external contact 210 is inserted between the braid 103 and the braid 103. The cylindrical part of the external contact 210 has a convex part 210a that protrudes in the radial direction on the outer peripheral surface at the lower end in the figure, and thereby acts to push up the braid 103 from inside to outside. The external contact 210 has a folded portion 210b so that the tubular portion and a part thereof have a double tubular structure, and has a pocket portion inside the folded portion 210b. The coaxial cable 100 is inserted into the innermost part of the pocket until the end of the braid 103 of the coaxial cable and the end of the outer sheath 104 are in contact with each other. And are firmly fixed.

Before or after connection with the coaxial cable 100, the external contact 210 is fixed to the connection nut 230 by the caulking portion 210 c of the external contact 210.

Since the external contact 210 and the connection nut 230 are tightened into the coaxial receptacle by rotating the connection nut 230, the connection nut 230 is engaged with the external contact 210 in a rotatable relationship. Is not fixed. In order to make the connection nut 230 rotatable with respect to the external contact 210, it is necessary to provide a certain margin between the two. As a result, there is a gap between the two, and noise often enters through this gap. Further, the contact relationship between the external contact 210 having a gap and the connection nut 230 is unstable, so that when the screw is tightened, an intermittent connection state occurs and noise is generated.

FIGS. 2A and 2B are plan views showing a configuration example of a ring-shaped contact spring 250 A as a spring-like conductive member inserted between the external contact 210 and the connection nut 230. It is sectional drawing along the AA line.

The ring-shaped spring 250A is formed by forming a flat elastic metal into a ring shape and simultaneously forming an arc shape in a radial direction. Thus, when the ring-shaped spring 250A is inserted between the external contact 210 and the connection nut 230, the convex or concave surface of the ring-shaped spring 250A comes into contact with the external contact 210, and the concave shape of the ring-shaped spring 250A is formed. Since the surface or the convex surface comes into contact with the connection nut 230, the elastic contact of the ring-shaped spring 250 </ b> A makes it possible to make good contact with both the external contact 210 and the connection nut 230 even when the connection nut 230 is tightened.

FIGS. 3A and 3B are configuration examples of another ring-shaped spring as a spring conductive member. FIG. 3A is a plan view, and FIG. 3B is a right side thereof. FIG.

As shown in FIG. 5B, the ring-shaped spring 250B is formed in a so-called waveform that repeats irregularities in the circumferential direction. Therefore, the ring-shaped spring 250B has a groove running in the radial direction. If only this groove is viewed, a gap may be formed between the external contact 210 and the connection nut 230. As the waves move, the waveform is crushed, and the gap becomes very small. Further, if the inner diameter of the ring-shaped spring 250A is formed such that no gap is formed between the ring-shaped spring 250A and the external contact 210, it is more effective against noise intrusion.

FIG. 4 is an exploded view showing a state where the ring-shaped spring 250 B shown in FIG. 3B is interposed between the external contact 210 and the connection nut 230.

The external contact 210 has an initial shape having a convex portion 210a at the lower left end of the cylindrical portion in the figure, a caulking portion 210c at the opposite end of the cylindrical portion, and a portion near the caulking portion 210c. A folded portion 210b is formed. After the ring-shaped spring 250B and the connection nut 230 are loosely fitted to the caulking portion 210c, caulking is performed.

[0022]

[Effect of the invention]

 In the present invention, as described above, since the spring conductive member is inserted between the external contact and the connection nut, when the connection nut is tightened during the connection work, the external contact is likely to have a gap. And the connection nut are tightly connected, and the connection state is not interrupted. As a result, even at the time of connection work, it is possible to prevent noise from entering from outside and prevent an intermittent connection state between the external contact and the connection nut from occurring, thereby preventing troubles due to the work.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a configuration of an embodiment of the present invention in a partial cross section.

FIG. 2 is a plan view showing a configuration example of a ring-shaped spring used in the embodiment of FIG. 1 and a cross-sectional view taken along line AA.

FIG. 3 is a plan view and a right side view showing another configuration example of the ring-shaped spring used in the embodiment.

FIG. 4 is an explanatory view showing a relationship before assembling of an external contact 210, a ring-shaped spring 250, and a connection nut 230 in the embodiment.

FIG. 5 is an explanatory view showing a cross section of a part of a conventional coaxial plug.

FIG. 6 is an explanatory diagram showing a problem occurring in a coaxial plug when a conventional coaxial plug is used.

FIG. 7 is an explanatory view showing another example of a conventional coaxial plug as a partial cross section.

[Explanation of symbols]

 21, 210 External contact 22, 220 Plug sleeve 23, 230 Connection nut 24 Contact spring 100 Coaxial cable 101 Core wire 102 Internal insulator 103 Braid 104 External insulator 210a Convex portion 210b Folded portion 210c Caulked portion

Claims (3)

[Utility model registration claims] 1. A coaxial cable having an insertion portion inserted between an inner insulator and a braid and a folded portion covering the outer skin at an end of the coaxial cable, and connected to an outer conductor of the coaxial cable. An external contact, and a connection nut whose inner periphery is threaded, one end is fitted to the end of the external contact, and the other end is an opening. In a high-frequency coaxial plug, which is a conductor and forms an outer conductor by the external contact and the connection nut to form a coaxial plug, a spring conductive member is inserted into a contact portion between the external contact and the connection nut. Features high frequency coaxial plug. 2. The high-frequency coaxial plug according to claim 1, wherein said spring-shaped conductive member is a ring-shaped spring. 3. The high-frequency coaxial plug according to claim 2, wherein the ring-shaped spring is formed as a wavy ring that repeats irregularities in a circumferential direction.