JPH0935824A - Connector for coaxial cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily eliminate twist of a cable caused by screw-tightening on a threaded cylinder furnished on an apparatus. SOLUTION: A body cylinder 1 is configured with a connecting nut 3 equipped with female threads 2 in the foremost part and a mantle cylinder 4 fitted by screw to the tail of the nut 3. Inside this body cylinder 1 a ferrule 5 is installed rotatably relatively the body cylinder 1, and on the outside of the tail of the ferrule 5 a pinching means is installed which works in cooperation with the ferrule 5 and pinches the sheath and outer conductor Ca of a coaxial cable C. On the inside of the foremost part of the ferrule 5 a center contact 26 is provided which pinches the inner conductor Cd of the coaxial cable C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial cable connector which is used by screwing a connection nut into a screw cylinder projecting from a device.

[0002]

2. Description of the Related Art For example, as disclosed in Japanese Utility Model Laid-Open No. 63-23789, a connection nut is provided separately from a main body cylinder, and a rear end side of the connection nut is rotated around a neck portion provided on the front end side of the main body cylinder. Generally, the structure is movably engaged.

[0003]

In the above-mentioned conventional example, since the ferrule to which the coaxial cable is attached and the center contact are integrated with the main body cylinder, when the connection nut is screwed into the screw portion protruding from the device, the connection nut is connected. If the nut and the main body tube are integrated, the ferrule also rotates via the main body tube with the rotation of the connection nut, and as a result, the coaxial cable is twisted, causing various troubles. For this reason, the connection nut is separated from the main body cylinder side to prevent twisting of the coaxial cable, but the connection nut is separate from the main body cylinder, so the number of parts increases and the overall Not only is it larger than necessary, but due to its structure, the work of assembling the connection nut and the main body tube is complicated, and when the connection nut is screwed onto the screw part provided on the device, the main body of the connection nut The connection part of may be damaged.

The present invention has been made by focusing on such disadvantages of the conventional example.

[0005]

Means for Solving the Problems A main body cylinder is constituted by a connecting nut having a female screw on the front end side and a jacket cylinder screwed on the rear end side of the connecting nut, and a ferrule is provided inside the main body cylinder. A holding means that is housed so as to be rotatable relative to the main body barrel and that holds the outer sheath and outer conductor of the coaxial cable integrally with the ferrule is provided outside the rear end side of the ferrule. The basic means is to provide a center contact for holding the inner conductor of the coaxial cable inside the tip side.

[0006] Specifically, the holding means is pushed forward by the pushing step formed on the inner side of the sleeve, and the ferrule is used to restrict the forward movement of the holding means. It is configured with an inner holding cylinder whose diameter is reduced inside.

Further, a pressing cylinder projecting into the female screw portion of the main body cylinder is removably mounted on the tip side of the ferrule, and a pin is inserted into the pressing cylinder inside the pressing cylinder on the axis of the main body cylinder. Center contact is disposed, and an insulating split clamp whose rear end side is locked to a locking step portion provided at an intermediate portion of the ferrule is interposed between the center contact and the pressing cylinder. The outer peripheral edge whose diameter gradually expands in the rear end direction is engaged with the inner peripheral edge whose diameter gradually expands in the rear end direction, which is provided on the rear end side of the pressing cylinder, and is connected to the inner conductor of the coaxial cable. The holding part of the center contact is provided with a slit along the axis of the main body cylinder to provide a more specific means.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of the coaxial cable connector according to the present invention. FIG. 1 is a cross-sectional view when in use, FIG. 2 is a cross-sectional view in the state of being assembled with a coaxial cable, and FIG. a-
It is a sectional view taken on line a.

Reference numeral 1 is a main body cylinder, and the main body cylinder 1 is composed of a connection nut 3 having a female screw 2 on the tip side thereof, and a jacket cylinder 4 screwed to the rear end side of the connection nut 3.

A ferrule 5 is housed inside the main body barrel 1 so as to be rotatable relative to the main body barrel 1, and an outer conductor Ca and an inner insulator Cb of the coaxial cable C are provided on the rear end side of the ferrule 5.
A slip-in cylinder portion 6 is provided between the outer conductor Ca and the inner insulator C by gradually reducing the outer diameter on the free end side.
It is easy to insert between b.

On the outside of the inserting cylinder portion 6, an inner holding cylinder 8 is arranged so that there is a charging gap 7 for the outer conductor Ca and the cable jacket Cc, and the inner holding cylinder 8 has a tip end side. The female screw portion 9 formed in the above is threadedly passed through a male screw portion 10 provided in an intermediate portion adjacent to the inserting cylinder portion 6 of the ferrule 5 and integrally attached to the intermediate portion, that is, the ferrule 5. Then, in the insertion tube portion 6 of the ferrule 5, the charging gap 7
An appropriate number of slits 11, ... Are provided on the circumferential side of the free end (rear end) portion 8a that overlaps in the radial direction with the use of the slits 11 so that the free end portion 8a can be forcibly reduced in diameter. is there.

Between the outside of the inner holding cylinder 8, that is, between the free end portion 8a and the jacket cylinder 4 forming the main body cylinder 1,
The tip portion 12a of the outer holding cylinder 12 is interposed.

The outer holding cylinder 12 is provided with a pair of slits 13 on the circumferential side of the tip portion 12a, and a projection having a shape gradually decreasing in diameter toward the rear end is formed on the outer peripheral surface of the partial piece partitioned by the slits 13, 13. A ridge 14 is provided, and the protruding rim 14 is used to connect the sleeve 4
It is forcibly assembled on the inner side of the jacket cylinder 4 so as to engage with the recessed portion 15 provided on the inner wall by utilizing the elasticity of the partial piece.

Further, in the outer holding cylinder 12, the inner wall of the tip portion 12a is gradually expanded in the tip direction (the diameter is gradually reduced in the rear direction).
A tapered edge 17, the opening end of the tapered edge 17 is made slightly larger in diameter than the outer diameter of the free end portion 8a of the inner holding tube 8, and the free end portion 8a is slidably contacted with the tapered edge 17 The free end 8a of the holding tube 8 is forcibly reduced in diameter. That is, the outer holding tube 12 has the connection nut 3
When the sleeve 4 and the sleeve 4 are screwed together, the pressing step portion 16 provided on the inner side of the rear side of the sleeve 4 causes the rear end portion (it is better to have an arc cross section to reduce the contact portion with the pressing step portion 16) side. It is pressed and moved forward along with the jacket tube 4, and as a result, the free end portion of the inner holding tube 8 is slidably contacted with the tapered edge 17 and relatively inserted into the outer holding tube 12 to forcibly reduce the diameter. The outer casing Ca and the outer conductor Ca are sandwiched between the outer conductor Ca and the inner insulator Cb, and the inserted cylindrical portion 6 sandwiches the outer conductor Ca and the inner insulator Cb.

Reference numeral 18 denotes a waterproof ring made of silicone resin, which is rotatably engaged with a groove provided in the sleeve 4.

The front end of the ferrule 5 engages with the connection nut 3 which constitutes the main body cylinder 1, and the pressing cylinder 19 is removably attached to the front end.

The pressing cylinder 19 is constructed by screwing and assembling a metallic reinforcing cylinder 21 to the front end of a main cylinder 20 made of a bottomed cylindrical body whose rear side is open. A funnel-shaped inner peripheral edge portion 2 having the maximum diameter at the end and gradually expanding toward the rear end.
2 is provided.

The pressing cylinder 19 is provided with a slit 23 in the main cylinder 20 to impart elasticity to the partial piece 23a, and a ridge 24 having a shape in which the diameter is gradually reduced toward the rear end on the peripheral side of the partial piece 23a. The protrusion edge 24 is engaged with the recessed portion 25 provided on the inner surface of the distal end of the ferrule 5 by utilizing its elasticity, and can be retracted relative to the distal end of the ferrule 5 relative to the distal end. It is attached to the ferrule 5.

On the axis of the main cylinder 20 of the pressing cylinder 19, that is, the main cylinder 1, the pin 2 is attached to the tip end piece 20a of the main cylinder 20.
The center contact 26 is provided by penetrating 6 '. The center contact 26 is provided with the pin 26' on the front end side and the slit 27 on the rear side so that the diameter can be reduced and the inner conductor Cd of the coaxial cable C can be held. A portion 28 is provided, and an engaging groove 29 is provided on the peripheral side of the intermediate portion between the pin 26 ′ portion of the center contact 26 and the holding portion 28, and the engaging groove 29 is provided on the inner peripheral surface on the tip side. Engage the locking ridge 30 to engage the split clamp 31,
It is interposed between the center contact 26 and the pressing cylinder 19. The rear end portion of the split clamp 31 is arranged so as to be locked by a locking step portion 33 provided in the middle portion of the ferrule 5.

The split clamp 31 is provided with an outer peripheral edge 32 on the rear end side, the diameter of which gradually expands in the rear end direction, and the outer peripheral edge 32 is made to coincide with the inner peripheral edge 22 of the pressing cylinder 19 so as to have the above-mentioned structure. As described above, the ferrule 5 is assembled on the tip side of the ferrule 5 so as to be interposed between the center contact 26 and the pressing barrel 19. When the pressing barrel 19 retracts relative to the ferrule 5, the inner peripheral edge 22 thereof is The outer peripheral edge 32 is pressed to reduce the diameter of the rear end side of the split clamp 32, and as a result, the holding portion 28 of the center contact 26 into which the inner conductor Cd is inserted is reduced in diameter to reliably hold the inner conductor Cd. is there.

Thus, the outer holding cylinder 12 and the holding cylinder 12
A coaxial cable C in which the end portion is processed in the sheathing tube 4 accommodating
The inner conductor Cd of the coaxial cable C is inserted into the holding portion 28 of the center contact 26, while the inserting cylinder portion 6 of the ferrule 5 is inserted between the outer conductor Ca of the coaxial cable C and the inner insulator Cb. When the sleeve 4 is moved to the distal end side of the coaxial cable C and the connection nut 3 is screwed and tightened on the sleeve 4, the tip 12a of the outer holding tube 12 becomes a free end of the inner holding tube 8. The diameter of the portion 8a is reduced, and the cable jacket C
c or the outer conductor Ca is held, and the ferrule 5 and the inner and outer holding tubes 8 and 12 are integrated with the coaxial cable C.

In this state, when the two female threads of the connection nut 3 are screwed into the male screw cylinder b protruding from the device, the pin 26 'of the center contact 26 is inserted into the receptacle installed in the device through the male screw cylinder b. On the other hand, while being inserted, the pressing cylinder 19 is retracted by being pressed by the tip of the male screw cylinder b, and as a result, the holding portion 28 of the center contact 26 is reduced in diameter to hold the internal conductor Cd as described above, 19, the split clamp 31, and the center contact 26 are integrated with the coaxial cable C via the inner conductor Cd.

The rotation of the body barrel 1 causes the ferrule 5 to move.
Alternatively, the outer holding cylinder 12 and the like rotate together with the coaxial cable C due to frictional resistance, and the coaxial cable C twists, but after the main body cylinder 1 is fastened to the male screw cylinder b, the coaxial cable C rotates in the opposite direction. By doing so, the twist is eliminated.

The inner holding tube 8, the outer threat tube 12, the main tube 20 and the split clamp 31 are made of synthetic resin.

[0025]

The present invention has the configuration described above,
A connector that can automatically tighten the coaxial cable by screwing the main body to the screw cylinder provided in the device and can easily eliminate the twist even if the cable is twisted during screw tightening. Can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view during use.

FIG. 2 is a cross-sectional view of a state in which the coaxial cable is assembled.

FIG. 3 is a sectional view taken along line aa of FIG.

[Explanation of symbols]

 1 Body Tube 2 Female Screw 3 Connection Nut 4 Jacket Tube 5 Ferrule 8 Inner Holding Tube 12 Outer Holding Tube 26 Center Contact C Coaxial Cable Ca Outer Conductor Cc Outer Cd Inner Conductor

Claims (4)

[Claims] 1. A main body cylinder is composed of a connection nut having a female screw on the front end side and a jacket cylinder screwed on the rear end side of the connection nut, and a ferrule is disposed inside the main body cylinder relative to the main body cylinder. Is installed so as to be rotatable, and on the outer side of the rear end side of the ferrule,
A connector for coaxial cables, which is equipped with a holding means for holding the outer sheath and outer conductor of the coaxial cable integrally with the ferrule, and a center contact for holding the inner conductor of the coaxial cable is provided inside the tip side of the ferrule. . 2. An outer holding cylinder which pushes the holding means forward by being pushed by a pressing step formed on the inner side of the sleeve, and a forward movement is restricted by a ferrule, and a rear end of the holding means is reduced in diameter inside the front end of the outer holding barrel. The connector for a coaxial cable according to claim 1, wherein the connector is an inner holding tube. 3. A pressing cylinder projecting into the female screw portion of the main body cylinder is removably attached to the distal end side of the ferrule, and a pin is inserted into the pressing cylinder inside the pressing cylinder on the axis of the main body cylinder. Center contact is disposed, and an insulating split clamp whose rear end side is locked to a locking step portion provided at an intermediate portion of the ferrule is interposed between the center contact and the pressing cylinder. The outer peripheral edge whose diameter gradually expands in the rear end direction is engaged with the inner peripheral edge whose diameter gradually expands in the rear end direction, which is provided on the rear end side of the pressing cylinder, and is connected to the inner conductor of the coaxial cable. The connector for a coaxial cable according to claim 1 or 2, wherein a slit along the axis of the main body cylinder is provided in the holding portion of the center contact. 4. The coaxial cable connector according to claim 3, wherein the tip of the split clamp is integrated with the center contact.