Fiber optic cable with ripcord

• US 6,088,499 A
• Filed: 09/30/1997
• Issued: 07/11/2000
• Est. Priority Date: 09/30/1997
• Status: Expired due to Term

• Current Assignee: CCS Holdings, Inc (Corning Incorporated)
• Original Assignee: Siecor Corporation (Corning Incorporated)
• Inventors: Newton, Katharine, Logan, Eric R., Field, Larry W.
• Primary Examiner(s): Lee, John D.
• Assistant Examiner(s): Kang, Juliana K.
• Application Number:
  US08/940,327
• Time in Patent Office: 1,015 Days
• Field of Search: 385/110-113, 385/100, 385/102-109
• US Class Current: 385/112
• CPC Class Codes: G02B 6/4431 with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping break-out terminations G02B6/4471
• CPC Class Codes: G02B 6/44384 the means comprising water blocking or hydrophobic materials G02B6/4439, G02B6/4479 take precedence

Abstract

A fiber optic cable (10) includes a cable core (20) and a sheath section (40). Interstitial assemblies (30) are disposed between cable core (20) and sheath section (40, at least one of the interstitial assemblies (30) includes a ripcord (38). Ripcord (38) is operative, upon application of a sufficient outwardly directed pulling force, to rip a cable core binder (26) stranded around buffer tubes (23), water swellable tape (27), and a binder (29) stranded around tape (27). A craftsman need not use a cutting tool to cut binders (26,29) and/or tape (27) which saves time and avoids potential injury to the craftsman and inadvertent damage to buffer tubes or other cable components.

Claims

1. A fiber optic cable, comprising:

a core section and a sheath section;

said core section comprises buffer tubes and a thread-like cable core binder that is generally helically stranded around and is generally in contact with said buffer tubes, a water swellable tape surrounding and generally in contact with said cable core binder, and a thread-like tape binder generally helically stranded around and in contact with said water swellable tape;

said core section further comprising a ripcord located radially inwardly of said cable core binder, said water swellable tape, and said tape binder, said ripcord being generally contactable with said water swellable tape whereby no jacketing material is disposed between said ripcord and said water swellable tape, upon application of sufficient pulling force said ripcord being operative to rip said core binder, said water swellable tape, and said tape binder.

2. The fiber optic cable of claim 1, said cable core binder having a denier of about 1625.

3. The fiber optic cable of claim 1, said tape binder having a denier of about 1625.

4. The fiber optic cable of claim 1, said ripcord having a denier of about 3000.

5. The fiber optic cable of claim 1, said cable core binder and said ripcord each having a respective denier value, a ripcord/core binder denier value ratio being about 1.5 to about 2.5.

6. The fiber optic cable of claim 1, one of said tape or core binders being formed of an oriented polymer material.

7. The fiber optic cable of claim 1, said ripcord being treated with a superabsorbent material.