DISTRIBUTOR FOR OPTICAL CABLE CONNECTIONS

Abstract: A distributor (1) for connections of optical cables of the sort where one or more fibres (3) are loosely enclosed within each of a plurality of tubes, which tubes are stranded together, comprises a member having a first body portion (7) for retaining one of the tubes to be broken into and a second body portion (8) for retaining a plurality of protective sleeves (4) one for each of the fibres. The two body portions are separated by a space (14) so that the fibre can be led out from the tube and separately inserted into each of the sleeves. The space is then enclosed by a cover (5) cooperating with the two body portions so as to protect the loose fibres in the space.

Description: Distributor for Optical ¯ Cable Connections This invention relates to distributors for optical cable connections and more particularly to distributors for connections of cables of the sort where one or more fibres are loosely enclosed within each of a plurality of tubes, which tubes are stranded together and enclosed within a protective sheath. When such cables need to be connected to other cables or to optical apparatus, the fibres within the cable have to be separated so that they can be spliced or otherwise connected to the other cable or apparatus. It is thus an object of the present invention to provide a device for separating out the fibres from a bundle of fibres within a tube and providing single, separate, protected fibres for connecting as desired. Accordingly, the invention provides a distributor for optical cable connections, comprising a first member having first and second spaced body portions, said first body portion having means for connection, in use, to a tube containing one or more optical fibres, said second body portion having means for connection, in use, to at least one protective sleeve into which the pr one of said fibres is inserted, and a second member which, in use, co-operates with said first member so as to enclose the space between said first and second body portions. In a preferred embodiment of the present invention, the first and second members are made of plastic, the second member being conveniently moulded in one piece with spacing members between the first and second body portions. Preferably the means for connection to a tube comprises a recess in one end of the first body portion into which, in use, the tube can be inserted, the recess preferably being extended through the body portion so as to form a passageway for the optical fibres to pass from the tube and into the space between the first and second body portions. Similarly, the means for connection to the protective sleeves may also comprise a recess in the end of the second body portion for each of the sleeves, the recesses being extended through the second body portion to the space between the body portions so that, in use, the optical fibres extending into the space from the first body portion can be inserted into the respective recess extensions in the second body portion and thus into their respective protective sleeves. Conveniently, both the tube and the sleeves are bonded into their respective recesses which are preferably of the same cross-section as the respective tube or sleeve, for example using an adhesive, but alternatively or additionally, the recesses may have ridges for gripping the outside of the tube or sleeves. The ridges may be circumferential but are preferably parallel to the direction of insertion of the tube or sleeves. One embodiment of a distributor according to the invention will now be more fully described by way of example with reference to the drawing of which: Figure 1 shows an end view of the distributor without the protective sleeves in place; and Figure 2 shows a longitudinal cross-sectional view of the distributor with the protective sleeves and the tube in place. In order to connect an optical cable to either another cable or some other optical apparatus, the optical fibres within the cable must be brought out of the cable structure and separated so that they can be spliced or connected as desired. For a cable of the type where several plastic tubes each loosely enclosing a bundle of optical fibres, this involves unravelling the plastic tubes and then cutting them open to get at the fibres which then need to be separated and protected before they can be spliced or connected. Thus the invention provides a distributor 1 which is connected at one end, to one such plastic tube 2 containing a plurality of fibres 3. The distributor 1 is made up of two parts - a cover member 5, and a distributor body 6, both of which are made of plastic. The cover member 5 is in the form of a cylinder with one end open and the other end tapering to an opening 15, through which the plastic tube 2 passes to reach the distributor body 6. The distributor body is made up of two body portions 7 and 8 spaced apart from and connected to each other by two longitudinally extending spacing members 9 moulded integrally with the portions and disposed one at each side of the body with a space between them. The first body portion 7 is in the form of a cylinder with one end tapering to co-operate with the cover member 5 and having a recess 10 in this end for receiving the plastic tube 2. A passageway 11 connects the recess 10 to the other end of the body portion 7 thus allowing the optical fibres 3 to pass right through the body portion 7 and into the space 14 between the two body portions 7 and 8. The second body portion 8 is also in the form of a cylinder, but it has several recesses 12 (ten in the illustrated embodiment as shown in Figure 1) passing right through the cylinder parallel to its axis. These recesses 12 are provided with plastic sleeves 4 bonded into recesses 12 by means of adhesive such as Cyanoacrylic adhesive. In use, therefore the cover member and the distributor body 6 are separated and the plastic tube 2 is passed through the cover member 5 and into the first body portion 7 and is bonded thereto. The optical fibres then extend through into the space 14 between the body portions 7 and 8 where they are separated and inserted into the plastic sleeves 4 already attached to the second body portion. The cover member 5 is then pushed back over the two body portions 7 and 8 so as to enclose the space 14 and protect the optical fibres 3 therein. An axially extending ridge 15 within the cover 5 engages within a co-operating groove in the body portion 8 so as to prevent relative rotation of the cover 5 and body 6. In an alternative embodiment, the recess 10 for receiving the plastic tube 2 may have longitudinal ridges along at least part of its length so as to more firmly grip the plastic tube 2. In such a case, the tube 2 need not be bonded to the first body portion 7 though it may be so bonded if desired.

Claims: CLAIMS 1. A distributor for optical cable connections comprising a first member having first and second spaced body portions, said first body portion having means for connection, in use, to a tube containing one or more optical fibres, said second body portion having means for connection, in use, to at least one protective sleeve into which the or one of said fibres is inserted, and a second member which, in use, co-operates with said first member so as to enclose the space between said first and second body portions. 2. A distributor according to Claim 1 wherein the first and second members are made of plastics material. 3. A distributor according to Claim 2 wherein the second member is moulded in one piece with spacing members between the first and second body portions. 4. A distributor according to any preceding Claim wherein the means for connecting the first body portion to a tube comprises a recess in one end of the first body portion into which, in use, the tube can be inserted which recess is extended through the body portion so as to form a passageway for the optical fibres to pass from the tube and into the space between the first and second body portions. 5. A distributor according to any preceding Claim wherein the means for connecting the second body portion to said protective sleeve or sleeves comprises for the or each said sleeve a recess extended through the second body portion. 6. A distributor according to Claim 4 or 5 wherein both the tube and the sleeve or sleeves are bonded into their respective recesses by an adhesive. 7. A distributor according to Claim 4 wherein the said recesses have ridges which press against and grip the outside of the tube or the sleeve or sleeves as the case may be. 8. A distributor according to Claim 7 wherein the ridges extend substantially parallel to the direction of insertion of the tube or the sleeve or sleeves.

Inventors: GEORGE, EDWARD KITCHENER, JUNG, ROGER ERWIN
Applicants: TELEPHONE CABLES LIMITED
Application year: 1985
Main classification: G02B6
IPC codes: G02B6