Terminating a shield of a malleable coaxial cable

• US 4,921,447 A
• Filed: 05/17/1989
• Issued: 05/01/1990
• Est. Priority Date: 05/17/1989
• Status: Expired due to Fees

• Current Assignee: AMP Incorporated (Johnson Controls International plc)
• Original Assignee: AMP Incorporated (Johnson Controls International plc)
• Inventors: Capp, Randolph E., Couper, William D.
• Primary Examiner(s): MCGLYNN, JOSEPH
• Application Number:
  US07/353,290
• Time in Patent Office: 349 Days
• Field of Search: 439/578-585, 439/874-876
• US Class Current: 439/585
• CPC Class Codes: H01R 4/02 Soldered or welded connections H01R4/625, H01R4/723, H01R12/59 take precedence
• CPC Class Codes: H01R 43/0207 Ultrasonic-, H.F.-, cold- or impact welding
• CPC Class Codes: H01R 9/05 for coaxial cables

Abstract

A method of terminating a malleable external shield (16) of a malleable coaxial cable (2) is carried out by inserting an end of the cable (2) into a tubular connector body (5) through one end (41) thereof and driving a shield gripping tubular metal member (8) surrounding the cable (2) into the connector body (5) from the one end (41) thereof so that the shield gripping member (8) tightly grips the cable shield (16), an external peripheral end flange (38) on the shield gripping member (8) being proximate to the one end (41) of the connector body (5). In order to afford strain relief for the electrical connection between the shield gripping member (8) and the cable shield (16), a solder ring (48) surrounding the cable (2) is held on the flange (38) and an induction heating ring (50) is employed to melt the solder ring (48) to provide a solder fillet (52) rigidly connecting the flange (38) to the cable shield (16).

Claims

1. A method of terminating a malleable external shield of a malleable coaxial cable, by means of a tubular connector body and a shield gripping tubular metal member having an external peripheral flange surrounding one end thereof, the method comprising the steps of;

inserting an end of said cable into said connector body through one end thereof;

driving said shield gripping member, in surrounding relationship with said cable, into said connector body from said one end thereof, into force fitting relationship with said connector body, tightly to grip said shield and thereby positioning said flange proximate to said one end of said connector body and externally thereof;

holding a solder ring against said flange on the opposite side thereof to said connector body and in surrounding relationship with said cable; and

heating the solder ring and said flange, and said cable in the vicinity of said flange, and thereby melting the solder ring to produce a solder fillet rigidly connecting said flange to said shield.

2. A method as claimed in claim 1, comprising the step of positioning said connector body to extend vertically, with said flange uppermost, following said step of driving said shield gripping member into said connector body;

and placing the solder ring on said flange prior to said solder ring heating step whereby the solder ring is held against the flange by force of gravity during said heating step.

3. A method as claimed in claim 1, wherein the solder ring is heated by holding the flange and the solder ring within an electric induction heating ring and energizing the heating ring.

4. A method as claimed in claim 2, wherein the flange, with the solder ring thereon, is introduced into an electric induction heating ring and the heating ring is energized to melt the solder ring to produce said fillet.

5. A method as claimed in claim 1, wherein said connector body is of substantially greater mass than said shield gripping member and is made of a less thermally responsive material.

6. A method as claimed in claim 5, wherein said connector body is made of stainless steel and said shield gripping member is made of a brass alloy.

7. A method as claimed in claim 1, wherein said flange is tin plated and said solder ring is self fluxing.

8. A method as claimed in claim 1, wherein during said step of driving said shield gripping member into said connector body, spline fingers projecting from said shield gripping member are forced into said shield and plough furrows therein.

9. A method as claimed in claim 1, wherein said shield comprises a wire braid filled with malleable metal.

10. A method as claimed in claim 1, wherein said shield gripping member is driven into said connector body into a home position in which said flange is spaced slightly from said one end of said connector body.

11. A coaxial electrical connector comprising in combination, a malleable coaxial cable having a malleable external shield;

a tubular connector body; and

a shield gripping tubular member having a peripheral flange surrounding one end thereof, said cable extending through said connector body and said shield gripping member, said shield gripping member being interposed between said cable and said connector body in force fitting relationship therewith with said flange proximate to one end of said connector body and positioned externally thereof, said connector further comprising a solder fillet extending about said cable and rigidly connecting said flange to said external shield on the opposite side of said flange to said connector body.

12. A connector as claimed in claim 11, wherein said flange is spaced from said one end of said connector body.

13. A connector as claimed in claim 11, wherein said shield comprises a wire braid filled with tin.

14. A connector as claimed in claim 11, wherein said connector body is of substantially greater mass than said shield gripping member, said shield gripping member being made of a brass alloy and said connector body being made of stainless steel.

15. A connector as claimed in claim 11, wherein said shield gripping member has spline fingers projecting therefrom and being embedded in said shield.

16. A connector as claimed in claim 11, wherein said connector body comprises an external annular flange proximated to the other end of said connector body, an external peripheral groove between said one end of the connector body and said annular flange, and a resilient clip received in said groove, a coupling nut mounted for rotation about said connector body being captive between said annular flange and said resilient clip, and being dimensioned so that it can be passed over said peripheral flange of said shield gripping member.

17. A method of terminating a malleable external shield of a malleable coaxial cable, by means of a tubular connector body and a shield gripping tubular metal member of substantially smaller mass than said body and having an external peripheral flange surrounding one end thereof, the method comprising the steps of;

inserting an end of said cable into said connector body through one end thereof;

electrically connecting said shield gripping member to said shield by driving said shield gripping member, in surrounding relationship with said cable, into said connector body from said one end thereof, into force fitting relationship with said connector body, tightly to grip said shield, and thereby positioning said flange proximate to said one end of the connector body and externally thereof; and

producing a solder fillet surrounding said cable and rigidly connecting said flange to said shield, to provide strain relief for the electrical connection between said shield gripping member and said shield.