JPH0129031B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a T-branch coaxial connector used for connecting other coaxial cables, circuits of wiring boards, etc. in the intermediate portion of a coaxial cable in a direction perpendicular to the longitudinal direction of the coaxial cable.

<Prior art> This type of conventional T-branch coaxial connector is, for example,
As shown in U.S. Pat. No. 4,120,554, issued October 17, 1978, a probe with a center conductor is simply pushed into the coaxial cable to be connected at right angles to its longitudinal direction, and the tip of the center conductor is This probe is brought into contact with the internal conductor of a coaxial cable, and the coaxial cable to be connected is connected to other coaxial cables through this probe. More specifically, when the coaxial cable to be connected is placed at a predetermined position on the mounting base and the movable part is used to hold the coaxial cable against the mounting base, the tip of the probe attached to the mounting base will hold the coaxial cable against it. The outer sheath and outer conductor are pushed through at right angles in order to contact the inner conductor. or U.S. Patent No. issued May 12, 1981.
As shown in the specification of No. 4266842, the coaxial cable to be connected is held on a mounting base, while a thread is formed on the outer periphery of the probe, and the probe is screwed into a screw hole fixed to the mounting base. Insert the tip of the coaxial cable into contact with the internal conductor. In this case as well, the part of the probe that is inserted into the coaxial cable is not threaded and is simply pushed in.

In this way, in conventional T-branch coaxial connectors, the probe is simply pushed into the coaxial cable, so a part of the outer conductor of the coaxial cable to be connected is pushed inside, and this outer conductor comes into contact with the inner conductor. I was afraid. Also, since the probe is simply pushed in, if the outside of the coaxial cable is relatively hard, a considerable amount of force is required to push the probe in.
There were cases where the tip of the probe could not be brought into reliable contact with the internal conductor.

<Summary of the Invention> An object of the present invention is to provide a T-branch coaxial connector in which there is no risk of the outer conductor coming into contact with the inner conductor.

Another object of the present invention is to provide a T-branch coaxial connector that does not require strong force to bring a probe into contact with an internal conductor and can bring the probe into contact reliably.

According to this invention, the coaxial cable to be connected is held in the holding groove of the mounting base, and in this state, the probe is inserted through the guide hole in the side wall of the holding groove, and the probe is pushed into the coaxial cable to be connected.
The probe has at least a center conductor and a cylindrical insulator surrounding the outer periphery of the center conductor, a thread is formed on the outer periphery of the probe, and the tip thereof is conical. The dimensions and shape of the probe are selected so that when the tip of the probe comes into contact with the inner conductor of the coaxial cable to be connected, the outer peripheral thread of the probe is at least within the outer conductor of the coaxial cable to be connected. Further, the cross-sectional shape of the thread on the outer periphery of the probe is an arbitrary triangle, that is, the thread is not trapezoidal but triangular.

With this structure, when the outer circumferential screw of the probe is screwed into the coaxial cable to be connected, the action of the screw applies a force that forces the part of the cable that comes into contact with the screw to be pushed outward. There is no risk of the conductor being pushed into the cable at the same time as the probe, ie there is no risk of bringing the outer conductor into contact with the inner conductor. Furthermore, the probe is rotated and pushed into the cable, and as a result of this rotation, a thread is automatically formed within the cable.
The probe is inserted by threading the screw with the outer circumferential thread of the probe, and rather than simply pushing the probe, the thread is cut into the cable. In other words, it is like cutting with a knife, and requires a relatively weak force. The probe can be screwed into the cable and the tip of the probe can be reliably contacted with the internal conductor.

<First Embodiment> FIG. 1 is an exploded perspective view of a coaxial connector according to the present invention, and FIG. 2 is a sectional view thereof. The mounting base 11 is made of an insulating material, for example, and has a holding groove 13 in which the coaxial cable 12 to be connected is held in the mounting base 11.
is formed. Groove 1 holding coaxial cable 12
Press the holding piece 1 to hold it in the specified position within 3.
4 is removably attached so as to cover the holding groove 13. For example, a portion of the holding piece 14 is fitted and inserted into the upper part of the holding groove 13, and engaging parts 15 and 16 that engage with the mounting base 11 in this state are integrally formed on both sides. Engagement grooves 17 and 18 are formed along the longitudinal direction of the holding groove 13 on the mounting base 11 side of the engagement parts 15 and 16.
The upper edges 2 of both side walls 21 and 22 of the retaining groove 13
3 and 24 are inserted and fitted. Both end surfaces of the engaging portions 15 and 16 in the longitudinal direction of the holding groove 13 are in contact with protrusions 25, 26, 27, and 28 formed protruding from both ends of both side walls 21 and 22 of the holding groove 13, respectively, and engaged. The positions of the joints 15 and 16 in the longitudinal direction of the holding groove 13 are determined. Mounting base 11 and holding piece 1
A common bolt 33 is inserted through the insertion holes 31 and 32 formed through the two parts, and the nut 34 is tightened to fix the holding piece 14 to the mounting base 11.

A semicircular recess 35 is formed on the bottom of the holding piece 14, and when the holding piece 14 is attached to the mounting base 11, the holding piece's recess 35 holds the coaxial cable 12 along its circumferential surface at the bottom of the holding groove 13. It becomes like this.
At this time, in order to accurately align the center position of the coaxial cable 12, the longitudinal center portions of the holding groove 13 and the recess 35 may have trapezoidal cross sections 36 and 37, respectively, as shown in FIG. preferable.

Coaxial cable 12 held in this holding groove 13
Guide holes 41 and 42 having center lines perpendicular to the center line of the inner conductor 38 are formed through the side walls 21 and 22, respectively. An auxiliary probe 43 and a coupling probe 44 are inserted into the holding groove 13 from the outside through the guide holes 41 and 42, respectively, and their tips are pushed into the coaxial cable 12. The coupling probe 44 is for connecting the coaxial cable 12 to another coaxial cable or a circuit on a wiring board, and the auxiliary probe 43 is for connecting the coaxial cable 12 to a circuit on a wiring board.
This is an auxiliary tool for ensuring that the tip of the inner conductor 38 is kept in contact with the inner conductor 38.

As shown in FIG. 2, the coupling probe 44 is provided with a cylindrical insulator 46 surrounding the outer periphery of a linear central conductor 45, and in this example, a metal cylinder 47 is further covered on the outside of the cylindrical insulator 46. . The metal cylinder body 4
A screw 48 is formed on the outer circumferential surface of 7. The tip of the probe 44 has a conical shape as a whole including the metal cylinder 47, and the height of the cone is h ₁
is selected to be smaller than the distance d ₁ from the outer periphery of the inner conductor 38 to the outer periphery of the outer conductor 49 of the coaxial cable 12 . Further, the thread of the screw 48 is triangular as shown in FIG. The other end of the probe 44 is a coupling knob 51 . Connecting knob 5
1, for example, as shown in FIG. 2, a collar 53 is integrally formed on the inner peripheral surface of the middle part of a metal cylindrical body 52, and a retaining plate 54 made of an insulating material is attached to one end surface of the collar 53.
are opposed to each other so as to close the inside of the cylindrical body 52, and a ring-shaped protrusion 55 is integrally formed on the periphery of the surface of the holding plate 54 opposite to the collar 53. On the other hand, a disc-shaped plate part 56 is integrally formed at the other end of the metal cylinder 47 of the probe 44, and the plate part 56 is brought into contact with the protrusion 55 of the holding plate 54, and in this state, the end of the cylindrical body 52 More retaining plate 5
4. The plate portion 56 is caulked to the collar 53. The center conductor 45 of the probe extends through the center of the holding plate 54, and has a connecting contact 57 at its protruding end.
is fixed so that it extends. This contact 5
7 and the main body 52 constitute a coaxial socket.
The other end of the cylindrical insulator 46 is brought into contact with a holding plate 54 via a metal washer 58 . A common metal pin 59 is inserted through the center conductor 45 and the insulator 46, and both ends of the pin 59 are engaged with washers 58 to absorb the force that the center conductor 45 and the insulator 46 receive in the axial direction.

The auxiliary probe 43 has almost the same structure as the coupling probe 44, and includes a center conductor 61, a cylindrical insulator 62, and a metal cylinder 63, a screw 64 is formed on the outer periphery, and the tip is conical. . The height of the cone is also selected in a similar relationship to probe 44. The other end of the probe 43 is a knob portion 65,
The knob portion 65 has a cylindrical shape with one end closed, and a plate portion 66 of the metal cylinder body 63 is caulked to close the open side. An insulating block 67 is housed inside the knob 65 so as to be able to move somewhat in the axial direction, and the other end of the center conductor 61 is inserted and fixed into the insulating block 67. Insulation block 6
7 is biased toward the plate portion 66 by a coil spring 68 within the knob portion 65 .

In the example shown in FIG. 2, the outer conductor 49 of the connected coaxial cable 12 is made of a metal pipe, and in order to connect the probe 44 to such a coaxial cable 12, the coaxial cable 12 is
As shown in the figure, it is placed in the holding groove 13 of the mounting base 11 and held in the groove 13 by the holding piece 14. In this state, as shown in FIG. Holes 72 and 73 reaching the insulating layer 71 are respectively formed. Next, probes 43 and 44 are screwed into these holes 72 and 73 through guide holes 41 and 42, respectively. At this time, female threads are cut on the inner peripheral surfaces of the holes 72, 73 of the outer conductor 49 by the respective screws of the probes 43, 44 to form female threads, and these female threads are screwed together with the respective screws of the probes 43, 44. probe 4
3 and 44 are rotated, the probes 43 and 44 advance, and the probe 4 is attached to the inner conductor 38 of the cable 12.
The tips of the center conductors 61 and 45 of No. 3 and 44 come into contact with each other from opposite directions. In this state, the probe 43,
44 is further rotated, the auxiliary probe 4
The central conductor 61 of No. 3 is pushed and the insulating block 67 moves against the biasing force of the spring 68. Note that since the insulating layer 71 is relatively soft, when screwing the probe 43 onto the cable 12, the insulating block 67 is
It is opposed to 6. The metal cylinder 47 is the outer conductor 4
9 and is electrically connected to the conductor 52.

<Second Embodiment> FIG. 4 shows another embodiment of the present invention, in which parts corresponding to those in FIGS. 1 and 2 are given the same reference numerals. This embodiment is suitable for a connected cable whose outer conductor is made of a braid. In the coupling probe 44, the metal cylinder 47 is omitted, the thickness of the cylindrical insulator 46 is increased, a screw 48 is formed on the outer periphery of the cylindrical insulator 46, and a conductor layer 74 is formed on the outer periphery of the cylindrical insulator 46 by, for example, plating. be done. The conductive layer 74 is not formed on the conical part of the tip of the probe 44, that is, the conductive layer 74
and the center conductor 45 are electrically insulated. A plate portion 75 is integrally formed with the insulator 46, and the plate portion 75 is caulked to the main body 52. At this time, the conductor layer 74 is formed to extend on the plate portion 75, and the extended portion of the conductor layer 74 comes into contact with the main body 52 to be electrically connected.
The screw 48 of the probe 44 is also formed to connect to the conical portion at the tip of the insulator 46 .

In this embodiment, a screw 48 is provided on the inner peripheral surface of the guide hole 42.
A female thread 76 is formed to screw into the coupling probe 4.
One half of the insulator 46 on the plate portion 75 side has a small diameter portion 77 with a small outer diameter so that the screw connection between the female screw 76 and the probe screw 48 is released when the tip of the insulator 46 is in contact with the internal conductor 38 of the cable 12. It is said that The auxiliary probe 43 also has an insulator 6 similar to the probe 44.
A screw 64 is formed on the outer periphery of the insulator 63, a conductor layer 78 is formed, a plate portion 79 of the insulator 63 is caulked to the knob portion 65, and a small diameter portion 81 is provided in the insulator 63, and a small diameter portion 81 is provided in the guide hole 41. A thread 82 is formed. Further, an elastic plate 83 bent into a U-shape is disposed in the middle of the holding groove 13 so as to elastically sandwich the cable 12 from both guide holes 41 and 42 sides. In this portion, the holding groove 13 has a rectangular cross section. Both legs of the U-shaped elastic plate 83 are opposed to the guide holes 41 and 42, and the opposing parts are cut and raised so that the central part bulges inward to form clamping parts 84 and 85, and holding grooves are formed. The cable 12 arranged on the
5 to clamp it elastically. The holding parts 84 and 85 have openings 86 and 87 through which the probes 43 and 44 are inserted.

To couple the coupling probe 44 to the coaxial cable 12 whose outer conductor 49 is made of braid,
For example, as shown in FIG. 5, unlike in the case of FIG.
Screw in the tip of 4. As shown in FIG. 4, when the screw 48 of the probe 44 is screwed into the female screw 76 of the mounting base 11, when the probe 44 is rotated,
Connect the tip of the probe 44 to the cable 1 with relative ease.
It can be screwed into 2. Since a thread 48 is also formed on the conical tip portion of the probe 44, the probe 44 can be threaded into the outer sheath 69 and the outer conductor 49. Just before the tip of the probe 44 reaches the internal conductor 38, the screw 48 and the female thread 76 are disconnected, and when the probe 44 is rotated several more times, the screw 4 is attached to the cut outer sheath 69 and the female thread of the external conductor 49.
8 is threadedly connected, the probe 44 easily advances to reach the inner conductor 38. When screwing the screw 48 into the cable 12, as shown in FIG.
The outer conductor 49 and the jacket 69 that are in contact with the circumferential surface of the outer conductor 8 are pulled outward and are forcibly expanded. Although the outer conductor 49 and the jacket 69 are pulled outward, when the cable 12 is held elastically by the clamping parts 84 and 85, the probe 44 can be screwed in without deforming the cable 12, and the outer conductor 49 can be brought into good contact with the conductor layer 74 on the outer periphery of the probe 44. Note that the side walls 21 and 22 of the holding groove 13 are held by the engaging portions 15 and 16 of the holding piece 14 so that they do not spread.

Probe 44 as shown in FIGS.
When the metal cylindrical body 47 is provided, it may be screwed into the cable 12 of the outer conductor 49 made of braid. In this case, a thread continuous with the outer thread 48 of the metal cylinder 47 is formed on the outer periphery of the conical portion at the tip of the probe 44 . Alternatively, the cable 12 may be coupled to the outer conductor 49 by other means without forming the conductor layer 74. In the first and second embodiments, the auxiliary probe 43 only needs to hold the coupling probe 44 and the internal conductor 38, so for example, the center conductor 61 and the metal cylinder 63 are insulated integrally with the cylindrical insulator 62 or separately. It can also be used as wood.

<Effects> As described above, according to the coaxial connector of the present invention, since the probe itself is screwed into the cable while cutting the thread, it is possible to bring the probe into contact with the internal conductor of the cable even with a relatively weak force. Further, since the cable 12 is screwed in while being cut, even if the insulating layer 71 of the cable 12 is relatively hard, the cable 12 can be screwed in easily. Since the probe screw is inserted into the cable, the portion of the cable in contact with the screw is pulled outward and there is no risk of contacting the inner conductor if the outer conductor is braided. Because the probe is inserted while rotating, the tip of the center conductor enlarges the contact area with the cable internal conductor as shown in FIG. is obtained, and this contact portion is in close contact and in a gas-tight state, and a contact with little deterioration over time is obtained. Further, since the screw 48 is screwed into the cable, the probe is difficult to loosen and stable contact can be obtained. Because it is screwed in, it is difficult for water and moisture to enter through the interface between the cable and the probe.
Prevents cable deterioration and provides good contact stability. If the outer circumferential thread 48 of the probe is made of metal or a conductive layer, connection with the external conductor can be automatically obtained when the probe is screwed into the cable.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an example of a coaxial connector according to the present invention, FIG. 2 is a cross-sectional view of the coaxial connector of FIG. 1, and FIG. FIG. 4 is a sectional view showing another example of the coaxial connector according to the present invention, FIG. 5 is a sectional view illustrating the coupling of the braid to the outer conductor, and FIG. 6 is a sectional view showing the state in which the outer conductor is extruded. 7 are enlarged sectional views showing a state in which the center conductor of the probe is in contact with the internal conductor. 11: Mounting base, 12: Coaxial cable to be connected, 1
3: Holding groove, 14: Holding piece, 21, 22: Side wall,
30: Internal conductor, 41, 42: Guide hole, 43: Auxiliary probe, 44: Coupling probe, 45: Center conductor, 46: Elastic insulator, 47: Metal cylinder, 48:
Screw, 49: outer conductor, 74: conductor layer.

Claims (1)

[Claims] 1. A coaxial cable to be connected is arranged in a holding groove, and a mounting base capable of holding and holding the cable at a predetermined position in the groove, and a guide hole formed in at least one side wall of the holding groove is inserted. The probe has at least a center conductor and a cylindrical insulator surrounding the outer periphery of the center conductor, and a thread is formed on the outer periphery of the probe, and the tip thereof is conical. Rotate the probe and push the tip into the coaxial cable to be connected, and with the tip of the center conductor in contact with the inner conductor of the coaxial cable to be connected, the outer circumferential screw of the probe should touch at least the outer conductor of the coaxial cable to be connected. A T-branch coaxial connector in which the dimensions and shape of the probe are selected so that the probe can be screwed into the T-branch coaxial connector.