Connector for fiber optic member

• US 4,447,121 A
• Filed: 11/06/1981
• Issued: 05/08/1984
• Est. Priority Date: 11/06/1981
• Status: Expired due to Term

• Current Assignee: AMP Limited
• Original Assignee: AMP Limited
• Inventors: Cooper, Ronald F., Johnson, Erlon F.
• Primary Examiner(s): Lee, John D.
• Assistant Examiner(s): Gonzalez, Frank
• Application Number:
  US06/319,025
• Time in Patent Office: 914 Days
• Field of Search: 350/96.20, 350/96.21, 350/96.22
• US Class Current: 385/87
• CPC Class Codes: G02B 6/3825 with an intermediate part, e.g. adapter, receptacle, linking two plugs
• CPC Class Codes: G02B 6/3854 Ferrules characterised by materials
• CPC Class Codes: G02B 6/3855 characterised by the method of anchoring or fixing the fibre within the ferrule G02B6/3854 takes precedence
• CPC Class Codes: G02B 6/3857 Crimping, i.e. involving plastic deformation
• CPC Class Codes: G02B 6/3858 Clamping, i.e. with only elastic deformation
• CPC Class Codes: G02B 6/3869 Mounting ferrules to connector body, i.e. plugs
• CPC Class Codes: G02B 6/3888 Protection from over-extension or over-compression
• CPC Class Codes: G02B 6/3894 Screw-lock type
• CPC Class Codes: G02B 6/4292 the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements

Abstract

A connector for a fiber optic member comprises a ferrule in which is positioned an insert surrounding a section of the fiber optic member adjacent an exposed end of the fiber optic member, the exposed end extending along a front bore of the ferrule. A crimping ring on the ferrule is controllably crimped thereon thereby moving arcuate sections of the insert into mechanical engagement with the fiber optic member with no or minimum deformation to the fiber optic member and securing the fiber optic member in the ferrule. A single crimping ferrule can be used if desired.

Claims

1. A connector for terminating a fiber optic member having a buffer material thereon comprising a ferrule having an opening extending therethrough including front and rear bores interconnected by a conical surface characterized in that:

an insert comprises a conical section and a cylindrical section, a hole through said conical section and said cylindrical section to enable the fiber optic member to be inserted therethrough with an end of the fiber optic member being exposed, said cylindrical section having a longitudinally extending slot communicating with said hole which forms arcuate members,

said insert being positionable on the buffer material and being insertable along with the fiber optic member into said opening with said conical section engaging at least a part of said conical surface and with said cylindrical section extending along said rear bore,

a crimping ring on said ferrule over said slot and adapted to be controllably crimped thereon to move said arcuate members thereunder into mechanical engagement with the buffer material to secure said fiber optic member within said ferrule with the exposed end of the fiber optic member disposed in the front bore.

2. A connector as set forth in claim 1 characterized in that said fiber optic member and buffer material is part of a fiber optic cable having strength members and an outer jacket, a crimping ferrule positioned along said ferrule and over said strength members and along said outer jacket and being controllably crimpable onto said ferrule in the area of said strength members to secure the strength members between the ferrule and crimping ferrule and onto said outer jacket to provide strain relief between said connector and said fiber optic cable.

3. A connector as set forth in claim 1 characterized in that the end surface of said fiber optic member is in the same plane as the front surface of said ferrule.

4. A connector as set forth in claim 1 characterized in that said ferrule comprises a front cylindrical section, a central cylindrical section, a rear cylindrical section and a conical section extending between said front and central cylindrical sections.

5. A connector for terminating a fiber optic means comprising:

ferrule means having a front section and a rear section, said ferrule means having an opening extending therethrough including a front bore extending through said front section and a rear bore extending through said rear section;

insert means having a hole extending therethrough and a longitudinally extending slot in communication with said hole for positioning a section of the fiber optic means along said hole, said insert means with the section of the fiber optic means in said hole being positionable in said rear bore with an end of the fiber optic means being disposed along said front bore; and

crimping ring means on said rear section being controllably crimpable thereonto thereby reducing said rear section under said crimping ring means and moving the part of said insert means under said crimping ring means into securing engagement with the area of the fiber optic means thereunder thereby securing the fiber optic means in said ferrule means.

6. A connector as set forth in claim 5 wherein said crimping means comprises a crimping ring.

7. A connector as set forth in claim 5 further comprising crimping-ferrule means positionable along said rear section and controllably crimpable thereonto and onto strain means of said fiber optic means extending along said rear section, said crimping-ferrule means controllably crimpable onto an outer jacket of the fiber optic means.

8. A connector as set forth in claim 5 wherein said opening through said ferrule means includes a conical surface extending between said front and rear bores, said insert means having a front conical section engaging onto said conical surface when in position in said opening.

9. A connector as set forth in claim 5 wherein said insert means includes a rear cylindrical section having slot means in communication with said hole thereby forming arcuate members defining said part of said insert means that is moved into engagement with the fiber optic means.

10. A connector as set forth in claim 5 wherein the end of the fiber optic means is coincident with a front surface of said front section.

11. A connector as set forth in claim 5 wherein said ferrule means is resilient.

12. A method of terminating a connector onto an end of fiber optic means characterized by the steps of:

placing a section of the fiber optic means adjacent the end of the fiber optic means into a hole of an insert member with the end of the fiber optic means extending outwardly therefrom, said insert member having a longitudinally extending slot in communication with said hole;

inserting said insert member with the section of the fiber optic means therein into an opening of a ferrule member with the end of the fiber optic means disposed in a front section of said opening; and

controllably crimping a crimping member on said ferrule member and over at least a portion of said insert member along said slot thereby reducing the ferrule member under said crimping member and moving the portion of said insert member thereunder into engagement with the section of the fiber optic means which secures the fiber optic means in said ferrule member.

13. A method as set forth in claim 12 characterized by the further step of positioning a crimping ferrule along strain members of the fiber optic means and along said ferrule member and said crimping member, and controllably crimping said crimping ferrule onto the strain members and said ferrule member thereby securing said crimping ferrule onto said ferrule member and the strain members therebetween.

14. A method as set forth in claim 13 characterized by the further step of controllably crimping said crimping ferrule onto an outer jacket of the fiber optic means.

15. A method as set forth in claim 14 characterized by the further step of scribing and breaking or hot knife cutting the end of the fiber optic means extending out from a front surface of said ferrule member at said front surface.

16. A method as set forth in claim 15 characterized by the further step of controllably crimping said crimping member at a crimping position normal to the original crimping position thereby elongating said ferrule member so that said front surface and the scribed and broken or cut surface of the fiber optic means are coincident.

17. A method as set forth in claim 12 characterized by the further step of scribing and breaking or hot knife cutting the end of the fiber optic means extending out from a front surface of said ferrule member at said front surface.

18. A method as set forth in claim 17 characterized by the further step of controllably crimping said crimping member at a crimping position normal to the original crimping position thereby elongating said ferrule member so that said front surface and the scribed and broken or cut surface of the fiber optic means are coincident.

19. A method as set forth in claim 12 characterized by the further step of controllably crimping said crimping member onto strain members of the fiber optic means and onto said ferrule member thereby reducing the ferrule member thereunder and moving another portion of said insert member into engagement with another section of the fiber optic means.

20. A method as set forth in claim 19 characterized by the further step of controllably crimping said crimping member onto an outer jacket of the fiber optic means.