Overmoulded furcation assembly with strain relief

• US 10,175,430 B2
• Filed: 05/04/2017
• Issued: 01/08/2019
• Est. Priority Date: 05/05/2016
• Status: Active Grant

• Current Assignee: Belden Canada ULC (Belden Inc.)
• Original Assignee: Belden CDT (Canada) Inc. (Belden Inc.)
• Inventors: Levy, Moise
• Primary Examiner(s): Ullah, Akm Enayet
• Application Number:
  US15/586,982
• Publication Number:
  US 20170322380A1
• Time in Patent Office: 614 Days
• CPC Class Codes: G02B 6/3851 Ferrules having keying or coding means
• CPC Class Codes: G02B 6/3885 Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type optical ribbon cable G02B6/4403, G02B6/448
• CPC Class Codes: G02B 6/443 Protective covering
• CPC Class Codes: G02B 6/4471 Terminating devices demountable connectors G02B6/3807; Cable clamps
• CPC Class Codes: G02B 6/4477 with means for strain-relieving to interior strengths element

Abstract

An assembly comprises an optic cable comprising a plurality of optic fiber subunits each comprising at least one optic fiber encased in a fiber jacket and a plurality of aramid strands is disclosed. The assembly further comprises one or more blocks comprising a passage ways for receiving the optic fiber subunits and maintaining adjacent ones of the optic fiber subunits at a predetermined spacing. A housing is molded over the open end of the cable jacket, the aramid strands and the first end of the at least one block. A method of overmolding a transition between an optic fiber cable and a furcation jacketing is also disclosed wherein a mold comprises ribs arranged at right angles to an axis of the mold and such that aramid strands are prevented during injecting from reaching a surface of the mold.

Claims

1. An overmoulded assembly comprising:

an optic cable comprising a cable jacket having an open end, a plurality of optic fiber subunits each comprising at least one optic fiber encased in a fiber jacket, and a plurality of aramid strands, wherein said at least one optic fiber and said aramid strands run along a length of said optic cable underneath said cable jacket and exit said open end;

at least one block comprising a plurality of passageways aligned with said optic cable length, each passageway receiving at least one of said optic fiber subunits and maintaining adjacent ones of said optic fiber subunits at a predetermined spacing and wherein each of said at least one block comprises a first end spaced from and facing said open end; and

a housing moulded over and in direct contact with said open end of said cable jacket, said aramid strands and said first end of said at least one block.

2. The overmoulded assembly of claim 1, further comprising a plurality of strain relief furcation tubes in contact with a second end of said block opposite said first end and aligned with a respective one of said passageways, and such that each optic fiber exiting said block is received within a respective one of said strain relief furcation tubes.

3. The overmoulded assembly of claim 1, comprising a plurality said passageways and wherein each of said at least one block comprises a like number of said passageways.

4. The overmoulded assembly of claim 1, comprising a plurality of said at least one block and wherein each of said at least one block is keyed such that it engages with adjacent ones of said at least one block.

5. The overmoulded assembly of claim 1, comprising a plurality of said at least one blocks.

6. The overmoulded assembly of claim 5, wherein each of said at least one block comprises four of said passageways.

7. The overmoulded assembly of claim 1, wherein said at least one block comprises a collar, said collar manufactured from a material other than said housing.

8. The overmoulded assembly of claim 1, wherein said housing is elongate and comprises a plurality of ribs moulded therein, each of said ribs arranged at right angles to an axis of said housing.

9. A method of overmoulding a transition between an optic fiber cable comprising at least one optic fiber surrounded by first aramid strands and a first outer jacket and a furcation jacketing comprising an optic fiber receiving tube surrounded by second aramid strands and a second outer jacket, the method comprising:

removing an end portion of the first jacket to expose the at least one optic fiber and the first aramid strands;

inserting the at least one optic fiber into a first end of the optic fiber receiving tube and such that a portion of the at least one optic fiber remains exposed between a first jacket end and second jacket end;

positioning ends of the first aramid strands and ends of the second aramid strands in a region between the first jacket end and the second jacket end;

placing the first jacket end, the second jacket end, the first and second aramid strands and the at least one optic fiber in an elongate mould comprising a plurality of ribs;

injecting a molten material into said mould to form an assembly comprising a moulded housing about the first jacket end, the second jacket end, the first and second aramid strands and the at least one optic fiber; and

removing said assembly from said mould once solidified;

wherein said ribs are arranged at right angles to an axis of said mould and such that the aramid strands are prevented during said injecting from reaching a surface of said mould.