JP2984559B2 - Coaxial relay connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for connecting a coaxial cable for transmitting a weak signal in various electronic devices such as a navigation system for automobiles and a mobile phone, which have recently become widespread, so that the coaxial cable can be appropriately separated. The present invention relates to a coaxial relay connector.

[0002]

2. Description of the Related Art As a coaxial relay connector of this type, a connector in which extremely thin coaxial cables having a diameter of about 2 mm to 3 mm are detachably connected to each other (FIG. 4).
(See FIG. 5). This coaxial relay connector A has a stepped cylindrical plug B fixed to one end of one coaxial cable and connected to its outer conductor, and a stepped cylindrical plug B fixed to the other coaxial cable and connected to its outer conductor. The plug is mainly composed of a stepped tubular jack fitting C to be connected. A tubular plug D is formed at an outer end of the plug fitting B, and a tip end is formed at the outer end of the jack fitting C. A cylindrical jack portion E to which radial elastic force is applied by a plurality of slits cut from the hole is formed.

At the center of the plug portion D, a cylindrical center contact fitting F connected to the center conductor of one coaxial cable is disposed concentrically via an insulating collar G. The portion is squeezed in a state where radial elastic force is applied by a plurality of slits. Further, a pin-shaped center contact fitting H connected to the center conductor of the other coaxial cable is concentrically arranged via an insulating collar I at the center of the jack portion E. A small-diameter chamfered contact pin J that fits into the tip of the center contact fitting F is formed. On the other hand, a lock tube L is mounted on the outer periphery of the plug B together with the lock ring K.

As shown in FIG. 5 on an enlarged scale, a ring-shaped contact projection M which is fitted on the inner periphery of the jack portion E and makes elastic contact is integrally formed on the outer periphery of the tip end of the plug portion D. A stopper projection N is formed integrally on the inner periphery of the distal end of the jack portion E so as to engage with the contact projection M in the axial direction so as to ride over the contact projection M in the axial direction in accordance with the expansion of the jack portion E. Have been. The lock ring K and the lock tube L are pressed by the spring O to face the outer periphery of the jack portion E fitted on the outer periphery of the plug portion D, so that the expansion of the jack portion E is prevented. . In this manner, the plug portion D and the jack portion E are retained in a fitted state in which the plug portion D and the jack portion E are prevented from coming off by the axial engagement between the contact protrusion M and the retaining protrusion N, so that the outer conductor of one coaxial cable and the other coaxial cable Are connected to each other at the same time, and at the same time, the contact pin J at the tip of the center contact fitting H fits into and contacts the inner periphery of the tip of the center contact fitting F, thereby forming the center of one coaxial cable. The conductor and the center conductor of the other coaxial cable are connected to each other.

[0005]

In the conventional coaxial relay connector A shown in FIGS. 4 and 5, the upper surface of the contact protrusion M of the plug portion D is connected to the jack fitting C at the time of connection and disconnection. The retaining projection N slides in the axial direction while elastically contacting and climbs over, and the contact pin J of the center contact fitting H slides and fits on the narrowed tip of the center contact fitting F while elastically contacting. I do. For this reason, the upper surface of the contact protrusion M and the inner peripheral surface of the front end portion of the center contact fitting F are easily worn away, and dusting is also easily generated. In particular, since the inner peripheral surface of the front end portion of the center contact fitting F is easily worn away, the conventional coaxial relay connector A has a mating / withdrawal durability of 200 to 10 times.
There was a problem that it was as low as about 00 times.

On the other hand, from a manufacturing point of view, the conventional coaxial relay connector A includes a lock ring K in addition to the lock tube L.
Is required, the number of parts is large, and a high processing accuracy is required for centering the tip of the center contact fitting F with the contact pin J of the center contact fitting H. In particular, the inner circumference of the jack E is required. There is a problem that the retaining projections N need to be formed on the surface with high precision by boring or the like, which increases the manufacturing cost.

In addition, the conventional coaxial relay connector A does not provide a click feeling when the connector is inserted or removed, so that even if the connection work is incomplete, it may not be noticed, and a connection work error is likely to occur. There was also.

Accordingly, an object of the present invention is to provide a coaxial relay connector which can greatly reduce the manufacturing cost, avoid mistakes in connection work, and obtain high insertion / extraction durability.

[0009]

SUMMARY OF THE INVENTION For this purpose, the present invention provides a center contact fitting connected to a center conductor of one coaxial cable and an outer conductor of one coaxial cable having a cylindrical plug portion. An outer conductor of the other coaxial cable having a plug fitting to be connected, a center contact fitting connected to the center conductor of the other coaxial cable, and a cylindrical jack portion provided with a radial elastic force by a slit; A coaxial relay connector comprising a jack fitting connected to the plug section and the center contact fitting contacting with each other with the fitting of the plug section and the jack section to detachably connect a pair of coaxial cables. A lock tube is attached to the bracket so as to be movable in the axial direction so as to be movable in the axial direction, and a lock tube is provided to cover the outer periphery of the jack portion. Click portion to form an inner peripheral ring-shaped contact protrusion which fits into the, in the inner circumference of the locking tube,
By pressing the outer periphery of the distal end of the jack portion to reduce the diameter, a ring-shaped throttle projection for pressing the inner peripheral surface of the jack portion against the contact projection is formed. The first means is to form a retaining projection which, by engaging with the projection in the axial direction, crosses the aperture projection in the axial direction in accordance with the diameter reduction of the jack portion.

A second means is that any one of the center contact fittings has a contact pin which is elastically contacted with the other by a spring force in an axial direction.

[0011]

In the coaxial relay connector according to the present invention employing the above first means, the inner peripheral surface of the jack portion whose distal end portion is reduced in diameter by the throttle projection of the lock tube is pressed against the contact projection of the plug portion. By conducting, the outer conductor of one coaxial cable and the outer conductor of the other coaxial cable are mutually connected. Since the contact protrusion of the plug and the inner peripheral surface of the jack are fitted without elastic contact at the time of connection and disconnection, they are hardly worn by sliding friction.

Further, when the retaining projection of the jack part gets over the throttle projection of the lock tube at the time of connection, the diameter of the jack part expands due to the elastic restoring force, and the outer peripheral surface hits the throttle projection, so that a click feeling can be obtained. .

Further, the lock ring as in the conventional example is unnecessary, and there is no need to perform a high-precision boring process on the inner peripheral surface of the jack portion of the jack fitting, and the center contact fittings can be connected with high precision. No need to align.

Further, in the coaxial relay connector of the present invention employing the second means, since the center contact metal pieces are elastically contacted in the axial direction by the spring force via the contact pins, there is absolutely no possibility of poor conduction due to wear. Absent.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. Coaxial relay connector 1 of one embodiment
1, reference numeral 2 denotes a plug fitting connected to an outer conductor 3a of one coaxial cable 3 having a diameter of about 3 mm, and reference numeral 4 denotes a center connected to a center conductor 3b of the one coaxial cable 3. Reference numeral 5 denotes a jack fitting connected to the outer conductor 6a of the other coaxial cable 6 having a diameter of about 2 mm, reference numeral 7 denotes a center contact fitting connected to the center conductor 6b of the other coaxial cable 6, and reference numeral 8 denotes The lock tube attached to the outer periphery of the plug fitting 2 is shown.

The plug metal fitting 2 is a stepped cylindrical member made of a conductive metal into which the insulating coating 3c of one of the coaxial cables 3 exposed to the inside of the outer conductor 3a is peeled off and exposed. A connection ring 9 is fixed by caulking to the outer periphery of the portion with the outer conductor 3a interposed therebetween. As shown in FIG. 2, a cylindrical plug portion 2a is formed at the distal end of the plug fitting 2 which is thus electrically connected to the outer conductor 3a of one coaxial cable 3.

The center contact fitting 4 is made of a conductive metal pipe material which is fitted to the center conductor 3b exposed from the insulating coating 3c of the one coaxial cable 3 and which is fixed by caulking. A small diameter contact receiving portion 4a is formed by processing (see FIG. 2). The center contact fitting 4 is concentrically arranged at the center of the plug 2a of the plug fitting 2 with an insulating collar 10 interposed therebetween.

On the other hand, the jack fitting 5 has a stepped cylindrical shape made of a conductive metal, and has a fixed ring 11 fitted into the end of the other coaxial cable 6 with its outer skin stripped inside its base end. Is facing. An outer conductor 6a is folded over the outer periphery of the fixing ring 11, and the base end portion is caulked to such a fixing ring 11, so that the jack fitting 5 is connected to the outer conductor 6a of the other coaxial cable 6. Conducted. A cylindrical jack portion 5a is formed at the distal end of the jack fitting 5, and a radial elastic force is applied to the jack portion 5a by a plurality of slits 5b extending along the axial direction from the distal end. .

Here, the center contact fitting 7 is made of a conductive metal pipe member 7a which is fitted and fixed to the center conductor 6b exposed from the insulating coating 6c of the other coaxial cable 6 by crimping. A conductive metal contact pin 7b fitted in the inner space so that it can slide forward and backward.
And a coil spring 7c housed in the pipe member 7a and urging the contact pin 7b in the advance direction. The contact pin 7b has a hemispherical contact head 7d formed at its tip. (See FIG. 2). The center contact fitting 7 is concentrically arranged at the center of the jack fitting 5 with an insulating collar 12 interposed therebetween. In addition, between the pipe member 7a of the center contact fitting 7 and the outer conductor 6a of the other coaxial cable 6,
It is insulated by an insulating ring 13 fitted to the insulating coating 6c.

The lock tube 8 has a spring receiving portion 8a formed by drawing at a base end thereof, and is mounted on the outer periphery of the plug fitting 2 so as to be movable in the axial direction. It has a cylindrical shape that covers the jack part 5a of the metal fitting 5, and includes a spring receiving part 8a and a plug metal part 2.
Coil spring 14 interposed between the collar portion 2b
Urged in the axial direction toward the proximal end. The outer peripheral surface of the lock tube 8 is knurled to prevent slippage.

As shown in FIG. 3, a jack fitting 5 is provided around the outer periphery of the tip of the plug 2a of the plug fitting 2.
A ring-shaped contact protrusion 2c is formed to fit into the inner periphery of the jack portion 5a without elastic contact. The contact projection 2c has a cross-sectional shape in which a front surface having an arc-shaped cross section and a rear surface having a gentle slope are continuous with a wide straight outer surface which can contact the inner periphery of the jack portion 5a.

Further, on the inner periphery of the lock tube 8,
A ring-shaped aperture projection 8b is formed which is prevented from coming off by the flange 2b of the plug 2 and presses the outer periphery of the distal end of the jack 5a of the jack 5 to reduce its diameter. The aperture projection 8b has a cross-sectional shape in which a front surface and a rear surface forming an inclined surface on a straight inner peripheral surface are continuous.

Further, on the outer periphery of the distal end portion of the jack portion 5a of the jack fitting 5, a throttle projection 8 of the lock tube 8 is provided.
b, which engages with the slant surface in the axial direction so that the retaining projection 5 can move over the throttle projection 8b in the axial direction according to the diameter reduction of the jack portion 5a.
c is formed intermittently on the circumference. This aperture projection 8
b has a cross-sectional shape in which a front surface and a rear surface forming an inclined surface are continuous with a relatively narrow straight outer peripheral surface.

An appropriate mounting flange 15 having a screw insertion hole is fixed to the outer periphery of the jack fitting 5.

In the coaxial relay connector 1 according to the embodiment having the above-described configuration, the lock tube 8 attached to the plug 2 and the base end side of the jack 5 are gripped to perform the connection operation. 8 in the space between the plug 2 and the plug 2a of the plug 2
Then, the lock tube 8 is axially moved forward toward the mounting flange 15 fixed to the jack fitting 5 against the coil spring 14. Then, the front surface of the throttle projection 8b of the lock tube 8 and the jack 5
a, the front surface of the retaining projection 5c engages with the inclined surface, and the jack portion 5a is elastically reduced in diameter, whereby the retaining projection 5c relatively gets over the throttle projection 8b.

FIG. 3 shows this state, in which the throttle projection 8b of the lock tube 8 presses the outer periphery of the distal end portion of the jack portion 5a to reduce the diameter, so that the inner peripheral surface of the jack portion 5a has the inner surface of the plug portion 2a. The contact portion 2c is brought into pressure contact with the jack portion 5a and the plug portion 2a is thus electrically connected, so that the outer conductor 3a of one coaxial cable 3 and the outer conductor 6a of the other coaxial cable 6 are connected to each other.

At the same time, the contact head 7d of the contact pin 7b of the center contact fitting 7 on the jack fitting 5 side elastically presses and contacts the contact receiving portion 4a of the center contact fitting 4 on the plug fitting 2 side. Are conducted, the center conductor 3b of one coaxial cable 3 and the center conductor 6b of the other coaxial cable 6 are connected to each other.

In this connection state of the coaxial relay connector 1, the rear surface of the stopper projection 5c of the jack portion 5a engages with the rear surface of the throttle projection 8b of the lock tube 8, so that the jack portion 5a is prevented from coming off. There is no inadvertent separation between the plug fitting 2 side and the jack fitting 5 side due to vibration or the like, and a good connection state is maintained for a long time. The coaxial relay connector 1 thus connected
Is separated into the plug fitting 2 side and the jack fitting 5 side in a procedure opposite to the connection operation described above.

Here, the coaxial relay connector 1 of the present embodiment
Since the contact protrusion 2c of the plug 2a fits into the inner peripheral surface of the jack 5a without elastic contact, the contact protrusion 2c and the jack 5
The inner peripheral surface of a is hardly worn by sliding friction.
And especially, the center contact fitting 7 on the jack fitting 5 side.
And the center contact fitting 4 on the plug fitting 2 side
This is due to the elastic contact in the axial direction between the contact head 7d of the contact pin 7b of the center contact fitting 7 and the contact receiving portion 4a of the center contact fitting 4, so that the conduction failure does not occur due to wear as in the conventional example. . Therefore, in the coaxial relay connector 1 of the present embodiment, a high insertion / extraction durability capable of withstanding 20,000 insertions / extractions is obtained.

In the coaxial relay connector 1 of the present embodiment, if the retaining projection 5c of the jack 5a gets over the throttle projection 8b of the lock tube 8 during connection, the diameter of the jack 5a increases due to elastic restoring force. Since the outer peripheral surface hits the inner peripheral surface of the diaphragm projection 8b, a click feeling can be obtained. Therefore, by performing the connection work so as to obtain a click feeling, mistakes in the connection work can be reliably avoided.

Further, the coaxial relay connector 1 of the present embodiment
Does not require the lock ring K as in the conventional example, there is no need to perform high-precision boring on the inner peripheral surface of the jack portion 5a of the jack fitting 5, and the contact receiving portion of the center contact fitting 4 is completely eliminated. Since it is not necessary to align the contact head 4d and the contact head 7d of the contact pin 7b of the center contact fitting 7 with high precision, the manufacturing cost is greatly reduced as compared with the conventional example.

In this embodiment, the center contact fitting 7 is disposed on the plug fitting 2 side, and the center contact fitting 4 is provided.
May be arranged on the jack fitting 5 side, and the center contact fitting 4 may have a solid distal end.

[0033]

As described above, according to the first aspect of the present invention, the inner peripheral surface of the jack portion whose distal end portion is reduced in diameter by the throttle projection of the lock tube is pressed against the contact projection of the plug portion to conduct electricity. As a result, the outer conductor of one coaxial cable and the outer conductor of the other coaxial cable are connected to each other, and the contact protrusion of the plug portion elastically contacts the inner peripheral surface of the jack portion during insertion and removal of connection and separation. Mating without
Since both are hardly worn by sliding friction, high insertion / extraction durability can be obtained.

Further, when the retaining projection of the jack portion gets over the throttle projection of the lock tube at the time of connection, the diameter of the jack portion is expanded by the elastic restoring force, and the outer peripheral surface of the jack portion hits the throttle projection, so that a click feeling is obtained. By performing the connection work so that a click feeling can be obtained, mistakes in the connection work can be reliably avoided.

Further, the lock ring as in the conventional example is unnecessary, and there is no need to perform high-precision boring on the inner peripheral surface of the jack portion of the jack fitting. Since there is no need for centering, the manufacturing cost can be significantly reduced as compared with the conventional example.

According to the second aspect of the present invention, since the center contact fittings resiliently contact each other in the axial direction by the spring force via the contact pins, there is no occurrence of poor conduction due to wear as in the conventional example. And extremely high insertion / extraction durability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a connection state of an embodiment of a coaxial relay connector according to the present invention.

FIG. 2 is a cross-sectional view showing a separated state of one embodiment.

FIG. 3 is a partially enlarged cross-sectional view showing a main part structure of one embodiment.

FIG. 4 is a cross-sectional view showing a separation state of a conventional example.

FIG. 5 is a partially enlarged cross-sectional view showing a main part structure of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coaxial relay connector 2 Plug metal fitting 2a Plug part 2b Collar part 2c Contact protrusion 3 One coaxial cable 3a Outer conductor 3b Center conductor 3c Insulation coating 4 Center contact metal fitting 4a Contact receiving part 5 Jack metal fitting 5a Jack part 5b Slit 5c Locking protrusion 6 Other coaxial cable 6a Outer conductor 6b Center conductor 6c Insulation coating 7 Center contact fitting 7a Pipe member 7b Contact pin 7c Coil spring 7d Contact head 8 Lock tube 8a Spring receiving part 8b Throttle projection 9 Connection ring 10 Insulation collar 11 Fixing ring 12 Insulation collar 13 Insulation ring 14 Coil spring 15 Mounting flange

Claims (2)

(57) [Claims] 1. A center contact fitting connected to a center conductor of one coaxial cable, a plug fitting having a cylindrical plug portion and connected to an outer conductor of one coaxial cable, and a A plug having a center contact fitting connected to the center conductor, a jack fitting having a cylindrical jack portion provided with a radial elastic force by a slit and being connected to an external conductor of the other coaxial cable; In the coaxial relay connector, in which the respective center contact fittings come into contact with each other with the fitting of the jack and the jack portion to detachably connect a pair of coaxial cables, the coaxial relay connector is prevented from falling out of the plug fitting and is mounted so as to be movable in the axial direction. A lock tube is provided to cover the outer periphery of the jack portion, and a ring-shaped contact is fitted to the inner periphery of the jack portion on the outer periphery of the tip portion of the plug portion. A ring-shaped throttle projection is formed on the inner circumference of the lock tube by pressing the outer circumference of the tip of the jack section to reduce the diameter, thereby pressing the inner circumference surface of the jack section against the contact projection. A stopper projection is formed on the outer periphery of the distal end of the jack portion so as to engage with the throttle projection in the axial direction so as to be able to move over the throttle projection in the axial direction in accordance with the diameter reduction of the jack portion. Coaxial relay connector. 2. The coaxial relay connector according to claim 1, wherein one of the center contact fittings has a contact pin which is elastically contacted with the other by a spring force in an axial direction.