Bonding assembly for fiber optic cable and associated method

• US 5,491,766 A
• Filed: 08/30/1994
• Issued: 02/13/1996
• Est. Priority Date: 04/16/1993
• Status: Expired due to Fees

• Current Assignee: Raychem Corporation (TE Connectivity Limited)
• Original Assignee: Raychem Corporation (TE Connectivity Limited)
• Inventors: Bower, Robert M., Huynh, Van L., Griffin, Steven D., Mickus, Deborah A.
• Primary Examiner(s): Bovernick, Rodney B.
• Assistant Examiner(s): Sanghavi, Hemang
• Application Number:
  US08/298,234
• Time in Patent Office: 532 Days
• Field of Search: 385/100, 385/101, 385/139, 385/76, 385/86, 385/135, 439/98, 439/99, 439/452
• US Class Current: 385/100
• CPC Class Codes: G02B 6/00 Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
• CPC Class Codes: G02B 6/4416 Heterogeneous cables
• CPC Class Codes: G02B 6/4446 Cable boxes, e.g. splicing boxes with two or more multi fibre cables
• CPC Class Codes: G02B 6/4471 Terminating devices demountable connectors G02B6/3807; Cable clamps
• CPC Class Codes: G02B 6/44775 Cable seals e.g. feed-through cable seals integrated to the box seals G02B6/4444; pulling eyes G02B6/44465

Abstract

A fiber optic cable bonding assembly includes a base member, a shield clamping member, and a strength member clamping member assembled in stacked relation. The fiber optic cable has a core, a metallic shield, at least one lengthwise extending strength member, and an overall jacket. A portion of the jacket is removed leaving exposed a portion of the metallic shield and the strength members. The base member has a tongue portion inserted between the shield and an underlying portion of the cable core. The shield clamping member overlies the shield to clamp the shield with the base member. A strength member clamping member overlies the strength members and the shield clamping member to clamp the strength members in a longitudinally extending direction. A threaded stud carried by the base member connects the base member, shield clamping member, and strength member clamping member together, as well as secures an end portion of a bonding strap to the stud.

Claims

1. A bonding assembly for a fiber optic cable of the type including an elongate core, a metallic shield surrounding the core, at least one strength member extending longitudinally adjacent the shield, and a jacket surrounding the shield and the at least one strength member, the fiber optic cable having a portion of the jacket removed thereby exposing the underlying shield and the at least one strength member, said bonding assembly comprising:

a base member having an end adapted to be inserted between an exposed shield portion and a corresponding underlying core portion of the fiber optic cable;

a shield clamping member adapted to overlie the exposed shield portion and cooperate with said base member for clamping the exposed shield portion therebetween;

a strength member clamping means member adapted to overlie an exposed portion of the at least one strength member and cooperate with said shield clamping member for clamping the exposed portion of the at least one strength member therebetween so that the exposed portion of the at least one strength member first extends in an outward direction and then extends in a generally longitudinal direction; and

connecting means adapted for connecting together said base member, said shield clamping member, and said strength member clamping member.

2. A bonding assembly according to claim 1 further comprising an electrical bonding strap having an end adapted to be secured to said connecting means.

3. A bonding assembly according to claim 1 further comprising a plurality of projections extending outwardly from the end of said base member and adapted for enhancing contact with adjacent portions of the shield.

4. A bonding assembly according to claim 1 wherein said shield clamping member has a first portion adapted to be positioned adjacent where the exposed portion of the at least one strength member emerges from the cable jacket, and wherein the first portion of said shield clamping member has at least one guide opening therein adapted for receiving therethrough the exposed portion of the at least one strength member.

5. A bonding assembly according to claim 4 wherein said shield clamping member has a second portion downstream from said first portion, and wherein said shield clamping member further comprises at least one radially outwardly extending guide hook carried by the second portion thereof and adapted for receiving therethrough the longitudinally extending exposed portion of the at least one strength member.

6. A bonding assembly according to claim 4 wherein said shield clamping member includes a third portion upstream from said first portion adapted for overlying a portion of the cable jacket, and further comprising a fastener adapted for surrounding the third portion of the shield clamping member and the underlying portion of the cable jacket.

7. A bonding assembly according to claim 1 wherein said strength member clamping member includes at least one pair of spaced apart projections extending radially inwardly therefrom and adapted for further confining the at least one strength member between said strength member clamping member and said shield clamping member.

8. A bonding assembly according to claim 1 wherein said connecting means comprises a threaded stud carried by said base member and extending radially outwardly therefrom, and wherein said shield clamping member and said strength member clamping member both include correspondingly positioned openings adapted for receiving therethrough said threaded stud.

9. A bonding assembly according to claim 8 further comprising a bonding strap having an end portion adapted to overlie said strength member clamping member, and wherein the end portion of said bonding strap includes an opening therein adapted for receiving therethrough said threaded stud.

10. A bonding assembly according to claim 1 further comprising sealing means adapted for surrounding the exposed portion of the fiber optic cable, said base member, said shield clamping member, and said strength member clamping member for preventing moisture migration from the fiber optic cable.

11. A bonding assembly according to claim 10 wherein said sealing means comprises a heat recoverable tube and a water blocking compound for filling voids underlying said tube.

12. A bonding assembly according to claim 1 wherein each of said base member, said shield clamping member, and said strength member clamping member have an arcuate transverse cross-sectional shape.

13. A bonding assembly for a fiber optic cable of the type including an elongate core, a metallic shield surrounding the core, at least one strength member extending longitudinally adjacent the shield, and a jacket surrounding the shield and the at least one strength member, the fiber optic cable having a portion of the jacket removed thereby exposing the underlying metallic shield and the at least one strength member, said bonding assembly comprising:

a base member having an end adapted to be inserted between an exposed shield portion and a corresponding underlying core portion of the fiber optic cable;

a shield clamping member adapted to overlie the exposed shield portion and cooperate with said base member for clamping the exposed shield portion therebetween, said shield clamping member having a first portion adjacent where the exposed portion of the at least one strength member emerges from the cable jacket, the first portion of said shield clamping member having at least one guide opening therein adapted for receiving therethrough the exposed portion of the at least one strength member;

a strength member clamping member adapted to overlie the exposed portion of the at least one strength member and cooperate with said shield clamping member for clamping an exposed portion of the at least one strength member therebetween so that the exposed portion of the at least one strength member is guided first in an outward direction, and then is guided in a generally longitudinal direction after passing through the at least one guide opening of said shield clamping member; and

connecting means adapted for connecting together said base member, said shield clamping member, and said strength member clamping member.

14. A bonding assembly according to claim 13 further comprising an electrical bonding strap having an end adapted to be secured to said connecting means.

15. A bonding assembly according to claim 13 further comprising a plurality of projections extending outwardly from the end of said base member and adapted for enhancing contact with adjacent portions of the shield.

16. A bonding assembly according to claim 13 wherein said shield clamping member has a second portion downstream from said first portion, and wherein said shield clamping member further comprises at least one radially outwardly extending guide hook carried by the second portion thereof and adapted for receiving therethrough the longitudinally extending exposed portion of the at least one strength member.

17. A bonding assembly according to claim 13 wherein said shield clamping member includes a third portion upstream from said first portion adapted for overlying a portion of the cable jacket, and further comprising a fastener adapted for surrounding the third portion of the shield clamping member and the underlying portion of the cable jacket.

18. A bonding assembly according to claim 13 wherein said strength member clamping member includes at least one pair of spaced apart projections extending radially inwardly therefrom and adapted for further confining the at least one strength member between said strength member clamping member and said shield clamping member.

19. A bonding assembly according to claim 13 wherein said connecting means comprises a threaded stud carried by said base member and extending radially outwardly therefrom, and wherein said shield clamping member and said strength member clamping member both include correspondingly positioned openings adapted for receiving therethrough said threaded stud.

20. A bonding assembly according to claim 19 further comprising a bonding strap having an end portion adapted to overlie said strength member clamping member, and wherein the end portion of said bonding strap includes an opening therein adapted for receiving therethrough said threaded stud.

21. A bonding assembly according to claim 13 further comprising sealing means adapted for surrounding the exposed portion of the fiber optic cable, said base member, said shield clamping member, and said strength member clamping member for preventing moisture migration from the fiber optic cable.

22. A bonding assembly according to claim 21 wherein said sealing means comprises a heat recoverable tube and a water blocking compound for filling voids underlying said tube.

23. A bonding assembly according to claim 13 wherein each of said base member, said shield clamping member, and said strength member clamping member have an arcuate transverse cross-sectional shape.

24. A bonding assembly for a fiber optic cable of the type including an elongate core, a metallic shield surrounding the core, at least one strength member extending lontiudinally adjacent the shield, and a jacket surrounding the shield and the at least one strength member, the fiber optic cable having a portion of the jacket removed thereby exposing the underlying shield and the at least one strength member, said bonding assembly comprising:

a base member having an end adapted to be inserted between an exposed shield portion and a corresponding underlying core portion of the fiber optic cable; and

clamping means adapted to be connected to said base member and overlie the exposed shield portion for clamping to the exposed shield portion and for clamping to an exposed portion of the at least one strength member and guiding the exposed portion of the at least one strength member to extend first in an outward direction and then in a generally longitudinal direction.

25. A bonding assembly according to claim 24 further comprising a bonding strap having an end adapted to be connected to said clamping means.

26. A bonding assembly according to claim 24 wherein said base member further comprises a plurality of projections extending outwardly therefrom and adapted for enhancing contact with adjacent portions of the shield.

27. A bonding assembly according to claim 24 further comprising a threaded stud carried by said base member and extending radially outwardly therefrom, and wherein said clamping means is secured to said base member by said threaded stud.

28. A method for bonding a fiber optic cable of the type having a core, a metallic shield surrounding the core, at least one longitudinally extending strength member extending longitudinally adjacent the shield, and a jacket surrounding the metallic shield and the at least one strength member, the fiber optic cable having a portion of the jacket removed thereby exposing the underlying shield and the at least one strength member, said method comprising the steps of:

establishing both an electrical and mechanical connection to an exposed shield portion of the fiber optic cable;

guiding an exposed portion of the at least one strength member to extend first in an outward direction and then in a longitudinal direction adjacent the electrical and mechanical connection to the exposed shield portion; and

securing the longitudinally extending exposed portion of the at least one strength member to the electrical and mechanical connection to the exposed shield portion.

29. A method according to claim 28 wherein the step of establishing both the electrical and mechanical connection comprises the steps of:

providing a base member and inserting an end portion thereof between the exposed shield portion and a corresponding underlying core portion of the fiber optic cable; and

providing a shield clamping member and clamping the shield clamping member overlying the exposed shield portion.

30. A method according to claim 28 wherein the step of securing the longitudinally extending exposed portion of the at least one strength member comprises the steps of providing a strength member clamping member and clamping same overlying the exposed portion of the at least one strength member.

31. A method according to claim 30 wherein the base member includes a threaded stud extending radially outwardly therefrom, and wherein the shield clamping member and the strength member clamping member include openings therein, and wherein the steps of clamping both the shield clamping member and the strength member clamping member comprise positioning the threaded stud through respective openings in both and securing an end of the threaded stud.

32. A method according to claim 29 wherein the shield clamping member includes at least one guide opening in a first portion thereof adjacent where the exposed portion of the at least one strength member emerges from the cable jacket, and wherein the step of guiding the exposed portion of the at least one strength member comprises positioning same through the at least guide opening.

33. A method according to claim 29 wherein the shield clamping member includes at least one radially outwardly extending guide hook at a second portion downstream from the first portion, and wherein the step of guiding the exposed portion of the at least one strength member further comprises positioning same through the at least guide hook.

34. A method according to claim 32 wherein the shield clamping member includes a third portion upstream from the first portion and overlying a corresponding portion of the cable jacket, and further comprising the step of securing the third portion to the fiber optic cable.

35. A method according to claim 28 further comprising the step of securing an electrical bonding strap to the electrical connection to the exposed shield portion.

36. A method according to claim 28 further comprising the step of sealing the fiber optic cable and the electrical and mechanical connection to the exposed shield portion for preventing moisture migration from the fiber optic cable.