Terminal end for coaxial cable

• US 4,923,412 A
• Filed: 07/20/1989
• Issued: 05/08/1990
• Est. Priority Date: 11/30/1987
• Status: Expired due to Term

• Current Assignee: Lamson & Sessions Company (ABB Limited)
• Original Assignee: Pyramid Industries, Inc. (ABB Limited)
• Inventors: Morris, William E.
• Primary Examiner(s): McGlynn, Joseph H.
• Application Number:
  US07/383,220
• Time in Patent Office: 292 Days
• Field of Search: 439/578-585
• US Class Current: 439/578
• CPC Class Codes: H01R 9/0521 Connection to outer conductor by action of a nut

Abstract

A two part coaxial cable connector includes a rear nut housing a ferrule for gripping the sheath of a coaxial cable and a front nut body for gripping the conductor upon threaded engagement of the rear and front nut bodies. A mandrel, located within and protected by the rear nut body, slides within the sheath upon feeding of the cable into the rear nut body. A pair of annular inclined surfaces or ramps compress the ferrule at opposed edges to squeeze the ferrule into gripping engagement with the sheath. Simultaneously, a collet in the front nut body is compressed to grip the conductor. To facilitate the feeding of a seamed or off round sheath, the ferrule, mandrel and associated parts float within the rear nut body. A positive visually apparent physical interference between the rear and front nut bodies prevents overtighting and resulting damage.

Claims

1. A coaxial cable connector having two threadedly engageable parts for terminating an end of a coaxial cable having a sheath and a conductor, said connector comprising in combination:

(a) a first part comprising a rear nut body for receiving and gripping the sheath of the coaxial cable, said nut body including

(1) a ferrule disposed within said rear nut body for at least partially circumscribing the sheath, said ferrule including means for at least axially floating said ferrule relative to said rear nut body upon engaging the cable with said rear nut body;

(2) ramp means for radially inwardly compressing at least a segment of said ferrule;

(3) a mandrel for penetrating the cable adjacent the inner surface of the sheath in juxtaposed relationship with said ferrule;

(b) a second part comprising a front nut body for receiving the conductor of the coaxial cable;

(c) means for axially translating said ramp means and said ferrule relative to one another upon threaded engagement of said rear nut body and said front nut body to compress at least a segment of said ferrule; and

(d) visually perceivable means for limiting the extent of threaded engagement between said rear nut body and said front nut body.

2. The connector as set forth in claim 1 wherein said rear nut body includes a collar for defining said ramp means.

3. The connector as set forth in claim 1 wherein said rear nut body includes an annularly expanded section for receiving said ramp means and, said ferrule while accommodating movement therebetween.

4. The connector as set forth in claim 3 including means for retaining said ramp means and said ferrule within said annular cavity.

5. The connector as set forth in claim 1 wherein said rear nut body includes a ring for defining said ramp means.

6. The connector as set forth in claim 5 including means for securing said mandrel with said collar to positionally support said mandrel interior of said ferrule.

7. The connector as set forth in claim 6 wherein said mandrel is contained within said rear nut body.

8. The connector as set forth in claim 1 wherein said front nut body includes a collet for imposing a gripping force upon the conductor and a seizing insulator for constricting said collet.

9. The connector as set forth in claim 8 wherein said front nut body includes an electrode having a split end for receiving the conductor and wherein said split end is insertable within said collet.

10. The connector as set forth in claim 9 wherein said electrode comprises a pin extending from said front nut body.

11. The connector as set forth in claim 8 wherein said seizing insulator includes an aperture for penetrably receiving the conductor.

12. The connector as set forth in claim 11 wherein penetration of the conductor into the aperture of said seizing insulator is visually perceivable upon assembly of said first and second parts.

13. The connector as set forth in claim 12 including means for urging said ferrule toward said collar to radially compress an end of said ferrule upon assembly of said rear nut body with said front nut body.

14. The connector as set forth in claim 1 wherein said ferrule is at least longitudinally repositionable within said rear nut body prior to feeding of the coaxial cable into said rear nut body.

15. The connector as set forth in claim 14 including a collar disposed within said rear nut body for supporting said ramp means adjacent one end of said ferrule.

16. The connector as set forth in claim 15 including means for retaining said collar and said ferrule within said rear nut body.

17. The connector as set forth in claim 16 wherein said retaining means comprises a snap ring.

18. A method for terminating a dressed end of a coaxial cable having a sheath and a conductor with a coaxial cable connector having a rear nut body threadedly engageable with a front nut body, said method comprising the steps of:

(a) feeding the dressed end into the rear nut body and through an at least axially floating ferrule retained within the rear nut body;

(b) axially realigning the ferrule during said step of feeding to facilitate penetrating engagement by the cable sheath;

(c) inserting in circumscribed relationship a mandrel located in the rear nut body within the sheath in juxtaposed relationship with the ferrule during exercise of said step of feeding;

(d) threadedly engaging the rear nut body with the front nut body;

(e) radially inwardly compressing opposed ends of the ferrule to grip the sheath during exercise of said step of threadedly engaging; and

(f) limiting with a mechanical stop the extent of threaded engagement between the rear nut body and the front nut body.

19. The method as set forth in claim 18 wherein said step of compressing includes the step of urging movement of at least one ramp against one end of the ferrule.

20. The method as set forth in claim 18 wherein said step of compressing includes the step of axially floating the ferrule within the rear nut body upon exercise of said step of feeding.

21. The method as set forth in claim 18 including the step of locating the conductor within a collet in the front nut body during said step of threadedly engaging and wherein said step of compressing includes the step of providing a visual indication of penetration of the conductor into the collet upon exercise of said step of locating.

22. The method as set forth in claim 18 wherein said step of compressing includes the step of maintaining the mandrel within the rear nut body prior to and subsequent to exercise of said steps of inserting and compressing.

23. The method as set forth in claim 18 wherein said steps of compressing is exercised during said step of threadedly engaging.