JP2607221B2 - Connector plug 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 connector plug for a coaxial cable generally called an F-type waterproof plug, and more particularly, to an F-type plug provided in various high-frequency devices. The present invention relates to an F-type waterproof connector plug attached to an end of a cable for connecting an F-type coaxial cable.

[0002]

2. Description of the Related Art Various types of F type high frequency coaxial cables such as FL type, HFL type and FB type are provided with a central core conductor, an internal insulating layer covering the outer periphery of the core conductor, and an internal insulating layer. A concentric structure comprising one or more outer conductor sheath layers covering the outer periphery of the layer and an outer insulating coating covering the outer periphery of the outer conductor sheath layer is provided.

A waterproof connector plug connected to the end of such an F-type coaxial cable has a center contact conductor having an axial hole opened at a tail end for receiving a core conductor tip of the coaxial cable. It is composed of a cylindrical main body fitting that is held in an insulating manner. This cylindrical fitting body
A tightening nut, which functions at least partially as an external contact conductor paired with the center contact conductor and is generally screwed to an F-type plug, is rotatably attached to a distal end side of the cylindrical main body fitting. I have.

A cylindrical conductor ferrule is arranged inside the cylindrical main body fitting at a coaxial distance from the tail end of the center contact conductor, and is coaxially arranged at the tail end side of the cylindrical conductor ferrule. A sharp-pointed cylindrical body that enters the inside from the end face of the cable and is in surface contact with the outer conductor sheath layer of the coaxial cable is formed, and thus the electrical connection with the cylindrical main body fitting is cylindrical. Performed by conductor ferrules.

[0005] A cylindrical fastener is screwed around the outer periphery of the cylindrical main body from the tail end side so as to surround the cylindrical conductor ferrule. The cylindrical fastener is provided inside the cylindrical fastener. When the metal fitting is screwed into the cylindrical metal fitting main body, it is deformed radially inward inside the cylindrical metal fitting to secure a contact pressure between the cylindrical conductive ferrule and the external conductive sheath layer. And a tubular clamp made of an insulator, which clamps the outer insulating coating of the coaxial cable.

In addition, an insulating ring, a bush, an O-ring packing, and the like are arranged in each of the fitting portions and the gap portions, so that the inside of the plug is kept almost completely sealed from the outside in an appropriate assembly and connection state. It is configured to be.

[0007]

In such a conventional F-type waterproof connector plug, in particular, in order to ensure the reliability of the electrical connection between the core conductor of the cable and the center contact conductor of the plug, the F-type waterproof connector plug is provided with the tip of the coaxial cable. When connecting the connector plug, it is common practice to insert the tip of the core conductor into the hole at the tail end of the center contact conductor and then crimp the tail end of the center contact conductor to a reduced diameter with a crimping tool. However, this operation is inconvenient in that it is a fine manual operation, and if the crimping force is improperly adjusted, the reliability of the connection is rather deteriorated and the operation requires skill.

On the other hand, in order to eliminate the need for the crimping operation by the crimping tool as described above, the tail end surface of the center contact conductor is formed in an annular tapered surface inclined to the front end side, and the cylindrical fastener is connected to the cylinder. The center contact is provided by applying an axial force to the annular tapered surface by utilizing the movement of an insulator ring that moves axially inside the tubular fastener when screwing and tightening into the cylindrical body. An F-type connector in which the tail end of a conductor is crimped to a reduced diameter is disclosed in, for example,
It is known from 1-32976.

However, in such a conventional self-crimping F-type connector, the tail end surface of the center contact conductor is formed in an annular tapered surface inclined to the tip end side, and an insulator ring acting on the tapered surface is complicated. Due to its unusual shape and being configured as a separate part that can be separated from the center contact conductor, it is necessary to assemble multiple small precision parts of complex shapes with the latest care in unstable field work when attaching to the cable In addition, the number of parts handled in the field work increases, and the insulator ring does not always abut the annular tapered surface in the correct positional relationship inside the cylindrical main body fitting at the time of tightening. A number of problems have been pointed out, such as the inadequacy of

A main object of the present invention is to provide a self-crimping type coaxial cable connector plug which can easily and stably obtain a crimping effect at the distal end of the coaxial cable.

Another object of the present invention is to provide a self-crimping type coaxial cable which does not require an insulator ring having a complicated shape, and can minimize the number of parts to be assembled in an unstable field work when attaching to a cable. The purpose of the present invention is to provide a connector plug.

Still another object of the present invention is to provide a stable press-fitting effect in which the insulator ring always acts on the tapered surface of the center contact conductor in the correct positional relationship inside the cylindrical main body fitting at the time of tightening. An object of the present invention is to provide a self-crimping type connector plug for a coaxial cable.

Still another object of the present invention is to provide a self-crimping type coaxial cable connector plug which is capable of coping with the size of the core wire conductor of the coaxial cable in a certain range with common parts. is there.

[0014]

According to the first aspect of the present invention,
A center contact conductor having an axial hole opened at a tail end for receiving a tip end of a core conductor of a coaxial cable; and an external contact paired with the center contact conductor while holding the center contact conductor insulated therein. A cylindrical main body fitting that performs at least a part of the function as a conductor, and a coaxial cable that is coaxially arranged inside the cylindrical main body fitting near a tail end of the center contact conductor and is spaced apart coaxially; A tubular conductor ferrule which enters the inside from the end face and performs an electrical connection between the outer conductor sheath layer of the coaxial cable and the tubular body fitting; and a tail of the tubular body fitting surrounding the tubular conductor ferrule. A cylindrical fastener that is screwed to the outer periphery from an end side, and deforms radially inward inside the cylindrical fastener when the cylindrical fastener is screwed into the cylindrical main body. A connector plug for a coaxial cable comprising: a cylindrical clamp means for securing contact pressure between the cylindrical conductor ferrule and the outer conductor sheath layer and clamping the coaxial cable against an outer insulating coating of the coaxial cable, A concave portion is formed in the outer peripheral surface of the center contact conductor at a position spaced from the tail end in the distal direction, and the bottom surface of the concave portion is connected to the outer peripheral surface by a tapered surface on the distal end side and is connected to the outer peripheral surface on the tail end side. A step portion is formed between the cylindrical main body fittings, and when the cylindrical tightening fitting is screwed into the cylindrical main body fitting, it is pressed toward the distal end via the cylindrical conductor ferrule. An annular insulator to be moved is disposed in engagement with the vicinity of the tail end of the center contact conductor by the recess, and the annular insulator cooperates with the tapered surface during the pressing movement. It is characterized in that the tightening portion which presses the tail end of the serial central contact conductor radially inwards are provided.

According to a second aspect of the present invention, in the connector plug for a coaxial cable according to the first aspect, an axial slit is formed from a tail end of the center contact conductor toward a region where the hole is formed. It is characterized by the following.

[0016]

According to the first aspect of the present invention, the tail end surface of the center contact conductor does not participate in the diameter reducing operation for the self-compression bonding function. Instead, a recess is formed on the outer peripheral surface of the center contact conductor at a position spaced from the tail end in the distal direction. The bottom surface of the concave portion is connected to the outer peripheral surface by a tapered surface on the distal end side, and forms a step between the outer peripheral surface on the tail end side. The recess may be a continuous recess over the entire circumference or a partial recess intermittent.

In addition, inside the cylindrical main body fitting, an annular insulator is disposed by being engaged with the vicinity of the tail end of the center contact conductor by the concave portion instead of the above-mentioned insulator ring. The insulator can have a relatively simple shape, and the center contact conductor and the cylindrical conductor ferrule, which are precision components inside the plug, can be used together with the ring insulator as a single component set that is not separated from each other for assembly work on site. You can do it.

This annular insulator is pushed and moved toward the distal end via the tubular conductor ferrule when the tubular fastening fitting is screwed into the tubular main body fitting. Is provided with a tightening portion for pressing the tail end of the center contact conductor inward in the radial direction by cooperating with the tapered surface during the pressing movement, and furthermore, the annular insulator is assembled on site. At the time of work, the annular insulator is already eccentric inside the cylindrical main body fitting when tightening because it is already engaged in the recess provided at a position spaced from the tail end of the outer peripheral surface of the center contact conductor to the tip end side. Alternatively, a stable crimping effect can be obtained by always acting on the tapered surface of the center contact conductor in a correct positional relationship without eccentric movement.

According to the second aspect of the present invention, in addition to the above, there is an effect that common parts can cope with the size of the wire diameter of the core conductor of the coaxial cable within a certain range. That is, the inner diameter of the hole opened at the tail end of the center contact conductor is originally determined in accordance with the outer shape of the core conductor of the coaxial cable to be connected. Since the slit in the axial direction is formed from the tail end of the conductor toward the hole forming region, even if the diameter of the core conductor of the cable is smaller than the inner diameter of the hole, the center contact conductor by the self-crimping function is provided. Since the diameter-reducing deformability of the tail end becomes large, the reliability of the electrical connection can be secured with a sufficient crimping effect even for a core conductor having a relatively small diameter within the effective height of the tapered surface.

In a preferred modification, the tail end of the center contact conductor is preformed so that the slit is slightly closed at the tail end, whereby the tip end of the core conductor of the cable is connected during the connection operation. When inserted into the hole, the tail end portion of the center contact conductor sandwiches the core wire conductor due to its elasticity, and the effect of temporary holding that the core wire conductor does not fall out of the hole even when the hand is released can be obtained. In this case, if the tail end face of the center contact conductor is formed in the inner surface of the mortar, the insertion of the core conductor becomes easy.

[0021]

1A is a sectional view of a coaxial cable connector plug according to an embodiment of the present invention in a state before tightening, and FIG. 1B is an enlarged sectional view of the vicinity of an end of a center contact conductor. is there. 2A is a cross-sectional view of the coaxial cable connector plug according to the present embodiment after being tightened, and FIG. 2B is an enlarged cross-sectional view near the center contact conductor end. FIG. 3 is an exploded perspective view showing the assembly of the center contact conductor and its related parts. In each case, coaxial cables are omitted to avoid complicating the figure.

The present embodiment shows a case of a waterproof connector plug connected to the end of an F-type coaxial cable. This plug uses a hexagonal tightening nut 1 to be screwed to a plug to be connected. A cylindrical main body fitting 3 is rotatably attached to the distal end by a ring 8 and has an O-ring packing 7 interposed on the inner surface side of the tightening nut 1. The outer surface of the cylindrical main body fitting 3 is formed in a hexagonal shape.

An insulator 9 having a central through hole is press-fitted into the distal end side of the cylindrical main body fitting 3.
The center contact conductor 2 is held at the center position while being insulated by the center through hole. The center contact conductor 2 can be inserted into the center through hole of the insulator 9.
The tail end of the center contact conductor 2 has an axial hole 2 for receiving a core conductor tip of a coaxial cable (not shown).
a is opened, and the end face of this opening is an inwardly tapered surface 2b in the shape of a mortar as shown in FIG. The cylindrical metal body 3 has a function as an external contact conductor paired with the center contact conductor 2 together with the tightening nut 1.

In the inside of the cylindrical main body fitting 3, a cylindrical conductor ferrule 4 having a slotted cylindrical portion 4a directed to the front end side is coaxially spaced near the tail end of the center contact conductor 2. The outer peripheral surface of the cylindrical portion 4 a is in surface contact with the inner surface of the cylindrical main body 3. On the tail end side of the cylindrical conductor ferrule 4, a sharp cylindrical body 4b having a tip which enters the inside of the sheath from the end surface of the coaxial cable and comes into surface contact with the outer conductor sheath layer of the cable is integrally formed. , Outer conductor sheath layer of coaxial cable and cylindrical main body fitting 3
Is electrically connected to the conductor ferrule 4.

A cylindrical fastener 5 is screwed around the outer periphery of the cylindrical main body 3 so as to enclose the cylindrical conductor ferrule 4 from the tail end side, and the outer surface of the cylindrical fastener 5 is also hexagonally shaped. Is formed. A cylindrical clamp 13 made of an insulator is attached to the inside of the cylindrical fastener 5 by a stop ring 12 so as to be relatively rotatable.
When the tubular fastener 5 is fully screwed into the tubular body 3 to a predetermined tightening position, the inner surface of the tail end of the tubular body 3 is tapered inside the tubular fastener 5. And deforms radially inward, thereby fulfilling the role of securing the contact pressure between the cylindrical conductor ferrule 4 and the outer conductor sheath layer and clamping the outer insulating coating of the coaxial cable.

An O-ring packing 10 is mounted on the outer surface of the cylindrical main body fitting 3 in the circumferential groove, and the O-ring packing 10 is configured such that the cylindrical fastening fitting 5 is fixed to the cylindrical fitting main body 3 in a predetermined manner. When fully screwed into the insertion position, the distal end portion of the cylindrical fastener 5 is pressed between the outer surface of the cylindrical main body 3 and the cylindrical main body 3 as shown in FIG. The seal between the fastener 5 is achieved. In addition, an O-ring packing 6 is arranged inside the cylindrical fastening member 5 between the tail end of the cylindrical clamp 13 and the O-ring packing 6.
A seal is provided between the outer end of the coaxial cable inserted into the inside from the tail end side of the tubular fastener 5, so that in a proper assembled connection state, the inside of the plug is almost completely external to the outside. It is configured to be kept in a sealed state.

Now, in this embodiment, on the outer peripheral surface of the center contact conductor 2, as shown in FIG. 3, a circumferential recess 2 c is formed at a position spaced from the tail end toward the tip end,
The bottom surface of the concave portion 2c is connected to the outer peripheral surface by a tapered surface 2d whose diameter gradually increases on the distal end side, and forms a step 2e between the outer peripheral surface on the tail end side.

In the inside of the tubular main body fitting 3, an annular insulator 11 integrally provided with a small-diameter tubular portion 11a at the tip end side of the center contact conductor at the tip end thereof for fitting into the recess is provided. The annular insulator 11 is disposed in a state of being pressed into the cylindrical portion 4 a of the cylindrical conductor ferrule 4.
Is engaged with the vicinity of the tail end of the center contact conductor by fitting the small-diameter cylindrical portion 11a into the concave portion 2c,
As a result, as shown in FIG. 3, the annular insulator 11 has a relatively simple shape as compared with the conventional insulator ring, and
The center contact conductor 2 and the cylindrical conductor ferrule 4, which are precision parts inside the plug, can be provided together with the annular insulator 11 as one set of parts that are not separated from each other, and can be provided for on-site assembly work.

When the cylindrical fastening member 5 is fully screwed into the cylindrical main body member 3 to a predetermined tightening position, the annular insulator 11 is disposed on the distal end side via the cylindrical conductor ferrule 4. The small-diameter cylindrical portion 11a of the annular insulator 11 presses the tail end of the center contact conductor 2 radially inward by cooperating with the tapered surface 2d during the pressing movement. Functions as a fastening part. In addition, since the annular insulator 11 is already engaged with the concave portion 2c provided at a position spaced from the tail end of the outer peripheral surface of the center contact conductor 2 to the distal end side at the time of assembly work on site,
The annular insulator 11 does not move eccentrically or eccentrically inside the cylindrical main body fitting 3 at the time of tightening, and always acts on the tapered surface 2d of the center contact conductor 2 in a correct positional relationship to obtain a stable crimping effect. it can.

Further, in this embodiment, an axial slit 2f is formed from the tail end of the center contact conductor 2 to the area where the hole 2a is formed, whereby the diameter of the core conductor of the cable is reduced to the hole 2a. Fig. 2
As shown in B, since the diameter of the tail end of the center contact conductor 2 can be reduced by the self-crimping function, the diameter of the tail end of the center contact conductor 2 can be reduced sufficiently within the effective height of the tapered surface 11d. The reliability of the electrical connection can be ensured by a simple crimping effect.

Particularly in this case, it is preferable that the tail end of the center contact conductor 2 is deformed in advance so that the slit 2f gradually closes toward the tail end of the center contact conductor. When the tip of the core conductor of the cable is inserted into the hole 2a during work, the tail end of the center contact conductor 2 clamps the core conductor due to its elasticity, and the core conductor does not fall out of the hole even if the hand is released. The effect of holding down can be obtained.

[0032]

As described above, according to the first aspect of the present invention, the center contact conductor and the cylindrical conductor ferrule, which are precision parts inside the plug, are not separated from the annular insulator together with the annular insulator. It can be used for assembling work, the annular insulator has a relatively simple shape than the conventional insulator ring, and the annular insulator does not move eccentrically or eccentrically inside the cylindrical main body fitting when tightened. The self-crimping method, which always works on the tapered surface of the center contact conductor in the correct positional relationship and can obtain a stable crimping effect, and therefore can be easily attached to the end of the coaxial cable and obtains a stable crimping effect It is possible to provide a connector plug for a coaxial cable.

According to the second aspect of the present invention, in addition to the above-described effects, since the axial slit is formed from the tail end of the center contact conductor, the diameter of the core conductor of the cable is reduced by the center contact conductor. Even if it is smaller than the inner diameter of the hole, the diameter of the tail end of the center contact conductor can be reduced and deformed by the self-crimping function. Therefore, it is possible to obtain an effect that common components can cope with the size of the wire diameter of the core conductor of the coaxial cable within a certain range.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a coaxial cable connector plug according to an embodiment of the present invention in a state before tightening, and FIG. 1B is an enlarged cross-sectional view of the vicinity of an end of a center contact conductor.

FIG. 2A is a cross-sectional view of the coaxial cable connector plug according to the present embodiment in a state after being tightened, and FIG. 2B is an enlarged cross-sectional view near the center contact conductor end;

FIG. 3 is an exploded perspective view showing assembly of a center contact conductor and its related components.

[Explanation of symbols]

 1: hexagonal tightening nut 2: central contact conductor 2a: hole 2c: concave portion 2d: tapered surface 2e: stepped portion 2f: slot 3: cylindrical main body fitting 4: cylindrical conductor ferrule 5: cylindrical fastening metal 9: Insulator with central through hole 11: Annular insulator 11a: Small-diameter cylindrical part (tightening part) 12: Stop ring 13: Cylindrical clamp

Claims (2)

(57) [Claims] 1. A center contact conductor having an axial hole opened at a tail end for receiving a tip end of a core conductor of a coaxial cable, the center contact conductor being held inside in an insulating manner and the center contact conductor being A tubular main body fitting that performs at least a part of the function as a pair of external contact conductors, and are coaxially spaced apart near the tail end of the center contact conductor inside the tubular main body fitting. A cylindrical conductor ferrule that enters the interior of the coaxial cable from the end face thereof and performs an electrical connection between the outer conductor sheath layer of the coaxial cable and the cylindrical main body metal fitting; and the tube so as to surround the cylindrical conductor ferrule. A cylindrical fastener that is screwed to the outer periphery from the tail end of the cylindrical main body; and a diameter inside the cylindrical fastener when the cylindrical fastener is screwed into the cylindrical main body. One A connector plug for a coaxial cable, comprising: a cylindrical clamp means for securing contact pressure between the cylindrical conductor ferrule and the outer conductor sheath layer by deforming inward and clamping the outer insulating coating of the coaxial cable. In the outer peripheral surface of the center contact conductor, a concave portion is formed at a position spaced from the tail end in the distal direction, and the bottom surface of the concave portion is connected to the outer peripheral surface by a tapered surface on the distal end side and is formed on the tail end side. A step portion is formed between the outer peripheral surface and the inside of the cylindrical main body fitting, and the distal end is formed via the cylindrical conductor ferrule when the cylindrical fastening fitting is screwed into the cylindrical main body fitting. An annular insulator that is pressed and moved to the side is disposed in engagement with the vicinity of the tail end of the center contact conductor by the concave portion, and the annular insulator cooperates with the tapered surface during the pressing movement. The center contact connector for coaxial cable plug, characterized in that the tightening portion which presses the tail end radially inward of the conductor is provided by Rukoto. 2. The coaxial cable connector plug according to claim 1, wherein an axial slit is formed from a tail end of the center contact conductor toward a region where the hole is formed.