# US 4,396,248 A · Connector for optical fibres > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,396,248 A - Document ID: US4396248A - Status: Granted - Kind: A - Application number: 06/223,228 - Filed: 1981-01-07 - Granted: 1983-08-02 - Earliest claimed: 1980-01-11 - Assignees: Commissariat a l'Energie Atomique - Inventors: Andre Bientz; Bernard Kling - Web page: https://patentgrep.com/patent/US4396248A ## CPC - G02B 6/3847: {with means preventing fibre end damage, e.g. recessed fibre surfaces} - G02B 6/3878: {comprising a plurality of ferrules, branching and break-out means} - G02B 6/3869: {Mounting ferrules to connector body, i.e. plugs} - G02B 6/3873: {Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls} - G02B 6/389: {characterised by the method of fastening connecting plugs and sockets, e.g. screw- or nut-lock, snap-in, bayonet type} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A connector for optical fibres comprising means (1, 2) for retaining the extremities (3, 4) of fibres to be connected, means (7) for assembling and aligning the thus-retained fibres, said means being adapted to maintain the plane front surfaces (5, 6) of the fibres to be connected opposite to each other, so that the optical axes of said fibres be aligned, wherein said aligning and assembling means (7) contain a barrel in two parts (8, 9) provided with bores in which are respectively engaged the retaining means of said extremities to be connected, said two parts of said barrel having front surfaces (5, 6) opposite to each other and parallel with those of the fibres, as well as means (12) for aligning said fibres to be connected, removable means (18, 19), an internal portion of which is adapted to maintain said front surfaces (5, 6) of the two parts of said barrel in contact with each other through abutment means (16, 17), and resilient means (20, 21) adapted to maintain tightness about said front surfaces (5, 6) of the two parts of said barrel, inside said removable means (18, 19). ## Claims ### Claim 1 A connector for optical fibres comprising means (1, 2) for retaining the extremities (3, 4) of fibres to be connected, means (7) for assembling and aligning the thus-retained fibres, said assembling and aligning means being adapted to maintain the plane front surfaces (5, 6) of the fibres to be connected opposite to each other, so that the optical axes of said fibres be aligned, wherein said aligning and assembling means (7) contain a barrel in two parts (8, 9) provided with bores in which are respectively engaged the retaining means of said extremities to be connected, said two parts of said barrel having front surfaces (5, 6) opposite to each other and parallel with those of the fibres, as well as means (12) for aligning said fibres to be connected, removable means (18, 19), an internal portion of which is adapted to maintain said front surfaces (5, 6) of the two parts of said barrel in contact with each other through abutment means (16, 17), and resilient means (20, 21) adapted to maintain tightness about said front surfaces (5, 6) of the two parts of said barrel, inside said removable means (18, 19). ### Claim 2 (depends on 1) A connector according to claim 1, said connector comprising, in addition, as an extension of said abutment means (16, 17) and in one part with the latter, a sleeve (23) through which the fibres to be connected pass via a sealed passage (24), said sealed passage being so constituted as to permit the storage, inside said sleeve, of a fibre length greater than the inner length of said sleeve. ### Claim 3 (depends on 2) A connector according to claim 2, wherein said means (1, 2) for retaining the extremities of fibres are constituted by rings respectively integral with the extremity of each fibre, said rings being engaged in said barrel bores, in such manner that the front surface of each of said rings corresponds to the front surface of the respective fibre, the front surfaces of each fibre and of its respective ring being retracted with respect to the front surface of the corresponding part of said barrel. ### Claim 4 (depends on 3) A connector according to claim 3, wherein said means for aligning fibres comprise at least one positioning stud (12) adapted to be engaged in each of said parts of said barrel. ### Claim 5 (depends on 4) A symmetrical barrel for positioning fibres in each part of the barrel of the connector according to claim 4, said positioning barrel being constituted by a part symmetrical with that portion of the connector barrel in which the fibres are to be positioned, positioning fibre tips being fixed in said symmetrical portion, opposite the bores of the respective part of the connector barrel, in such manner that said tips protrude from the front surface of said symmetrical portion, opposite the front surface of the respective part of said connector barrel, by a distance equal to half the desired spacing. ### Claim 6 (depends on 2) A connector according to claim 2, wherein said means for retaining the extremities of fibres are constituted by rings (48, 49) integral with each fibre at the extremity thereof, in such manner that the front surface of each of said rings corresponds to the front surface of the respective fibre, the bores in a first part (9) of said barrel being so designed that the front surfaces of said rings be retracted with respect to the front surface of said first part (9) of said barrel, the bores in the second part (8) of said barrel being so designed that the front surfaces of said rings be ahead of the front surface of said second part (8) of said barrel, so that the junction of the fibre extremities is obtained in said first part (9) of said barrel, said means for aligning the fibres being constituted by said rings of said second part of said barrel, said rings having an outer surface (50, 51) of conical shape in the portion thereof situated ahead of the front surface of said second part (8) of said barrel, said conical outer surface being engaged in the partly conical inner surface of the corresponding bore of said first part (9) of said barrel.