GB1579309A - High pressure gland for optical fibre - Google Patents
High pressure gland for optical fibre Download PDFInfo
- Publication number
- GB1579309A GB1579309A GB2245878A GB2245878A GB1579309A GB 1579309 A GB1579309 A GB 1579309A GB 2245878 A GB2245878 A GB 2245878A GB 2245878 A GB2245878 A GB 2245878A GB 1579309 A GB1579309 A GB 1579309A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fibre
- bore
- gland
- resilient material
- aperture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4415—Cables for special applications
- G02B6/4427—Pressure resistant cables, e.g. undersea cables
- G02B6/4428—Penetrator systems in pressure-resistant devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Light Guides In General And Applications Therefor (AREA)
Description
(54) HIGH PRESSURE GLAND FOR OPTICAL FIBREN (71) We, STANDARD TELEPHONES
AND CABLES LIMITED, a British Company, of 190 Strand, London W.C.2., England, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed to be particularly described in and by the following statement-: This invention relates to high pressure glands for plastics coated optical fibres.
The use of optical fibres as telecommunications transmission media is being developed in a wide variety of applications.
One such application is the provision of optical telecommunication links through bulkheads or the like where high pressure differentials exist between the two sides of the bulkhead and it is required to pass a plastics coated optical fibre through an aperture in such a bulkhead.
According to the invention there is provided a high pressure gland for a plastics coated optical fibre including a rigid member having an aperture through which the fibre is threaded, the aperture having a diameter for a portion of its length which is a close fitting for the fibre, the remainder of the length of the aperture having an enlarged diameter, a cylindrical body of resilient material having an external diameter the same as the enlarged diameter of the aperture and located therein, the body having a longitudinal bore through which the fibre is threaded, and means for producing hydrostatic pressure in the body, the bore of the body being adapted to cause gripping of the fibre when the hydrostatic pressure is generated.
Embodiments of the invention will now be described with reference to Figures 1-3 of the accompanying drawings which illustrate three different embodiments respectively.
In all the drawings the same parts are given the same reference numerals. It is assumed in each case that the plastics coated optical fibre 1 passes through a high pressure bulkhead 2. The bulkhead 2 is provided with an aperture having a portion 3, which is a close fit around the fibre 1, and a portion 4 which is of considerably larger diameter.
In the embodiment shown in Figure 1 a cylindrical body 5 of resilient material having a bore 6 is threaded by the fibre 1 and occupies a major part of the enlarged aperture portion 4. The bore 6 is larger than the fibre for part of its length and the space between the two is filled by a split metal collet 7 which can, if required, be provided with a roughened, e.g. threaded, bore which is a close fit around the plastics coating of the fibre. The cylindrical body 5 longitudinally compressed by means of a compression screw 8 engaging a threaded part 10 of the enlarged portion 4 and a rigid, e.g. metal, spacer bush 9.
Longitudinal compression of the body 5 produces hydrostatic pressure therein which applies radial pressure to the collet 7 causing the latter to grip the fibre 1 lightly.
This construction of gland has been used in bulkheads sustaining pressures up to 10,000 pounds per square inch. Once sealed at low pressures the sealing of the gland is self generating at high pressures.
The seal operates by deforming the fibre coating such that longitudinal forces in the fibre are resisted by placing the coating material in shear. The sealing has no effect on fibre attenuation at pressures of up to 10,000 p.s.i.
In the second embodiment shown in
Figure 2, the resilient body 5 has its bore closely fitting the fibre coating along the whole length of the body 5. The body 5 is made of a low strength material such as rubber and the hydrostatic forces compress the rubber directly on to the fibre. This type of gland can be used at up to 6,500 p.s.i. The seal relies solely on the friction between the fibre and the body 5 to resist longitudinal forces in the fibre.
In the third embodiment shown in
Figure 3 the body 5 is made of a medium strength material, e.g. nylon, and its bore is roughened, e.g. threaded. The hydrostatic forces generated by the screw 8 and bush 9 cause the body 5 to deform sufficiently so that the bore grips the coating of the fibre, the roughened surface of the bore in turn causing deformation of the surface of the plastics coating of the fibre.
This gland can be used at up to 10,000 p.s.i. The seal operates as in the first embodiment, by placing the fibre coating in shear to resist longitudinal forces in the fibre.
WHAT WE CLAIM IS:
1. A high pressure gland for a plastics coated optical fibre including a rigid member having an aperture through which the fibre is threaded, the aperture having a diameter for a portion of its length which is a close fitting for the fibre, the remainder of the length of the aperture having an enlarged diameter, a cylindrical body of resilient material having an external diameter the same as the enlarged diameter of the aperture and located therein, the body having a longitudinal bore through which the fibre is threaded, and means for producing hydrostatic pressure in the body, the bore of the body being adapted to cause gripping of the fibre when the hydrostatic pressure is generated.
2. A gland according to claim 1 including a split metal collet within the longitudinal bore of the cylindrical body of resilient material, the collet being caused to grip the fibre by the hydrostatic forces produced in the resilient body.
3. A gland according to claim 2 in which the bore of the collet has a roughened surface.
4. A gland according to claim 1 wherein the body of resilient material is made of a low strength material and its bore is a close fit on the fibre.
5. A gland according to claim 4 in which the resilient material is rubber.
6. A gland according to claim 1 wherein the body of resilient material is made of a high strength material and its bore is a close fit on the fibre, the bore having a roughened surface.
7. A gland according to claim 6 wherein the body of resilient material is made of nylon.
8. A gland according to any preceding claim wherein the means for producing hydrostatic pressure comprises a compression screw engaging a threaded part of the enlarged diameter bore of the rigid member, and a rigid spacer bush between the screw and the body of resilient material.
9. A high pressure gland for a plastics coated optical fibre substantially as described with reference to any one of the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (9)
1. A high pressure gland for a plastics coated optical fibre including a rigid member having an aperture through which the fibre is threaded, the aperture having a diameter for a portion of its length which is a close fitting for the fibre, the remainder of the length of the aperture having an enlarged diameter, a cylindrical body of resilient material having an external diameter the same as the enlarged diameter of the aperture and located therein, the body having a longitudinal bore through which the fibre is threaded, and means for producing hydrostatic pressure in the body, the bore of the body being adapted to cause gripping of the fibre when the hydrostatic pressure is generated.
2. A gland according to claim 1 including a split metal collet within the longitudinal bore of the cylindrical body of resilient material, the collet being caused to grip the fibre by the hydrostatic forces produced in the resilient body.
3. A gland according to claim 2 in which the bore of the collet has a roughened surface.
4. A gland according to claim 1 wherein the body of resilient material is made of a low strength material and its bore is a close fit on the fibre.
5. A gland according to claim 4 in which the resilient material is rubber.
6. A gland according to claim 1 wherein the body of resilient material is made of a high strength material and its bore is a close fit on the fibre, the bore having a roughened surface.
7. A gland according to claim 6 wherein the body of resilient material is made of nylon.
8. A gland according to any preceding claim wherein the means for producing hydrostatic pressure comprises a compression screw engaging a threaded part of the enlarged diameter bore of the rigid member, and a rigid spacer bush between the screw and the body of resilient material.
9. A high pressure gland for a plastics coated optical fibre substantially as described with reference to any one of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2245878A GB1579309A (en) | 1978-05-25 | 1978-05-25 | High pressure gland for optical fibre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2245878A GB1579309A (en) | 1978-05-25 | 1978-05-25 | High pressure gland for optical fibre |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1579309A true GB1579309A (en) | 1980-11-19 |
Family
ID=10179692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2245878A Expired GB1579309A (en) | 1978-05-25 | 1978-05-25 | High pressure gland for optical fibre |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1579309A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2510269A1 (en) * | 1981-07-23 | 1983-01-28 | Souriau & Cie | Optical fibre coupling with min. signal losses - uses bore receiving connector pins and cuff around at least one pin |
| FR2520124A1 (en) * | 1982-01-21 | 1983-07-22 | Silec Liaisons Elec | Optical fibre fitting for flame proof box - has metal plug with lined metallic capillary tube carrying fibre through casing of box |
| US4548465A (en) * | 1983-10-11 | 1985-10-22 | Rca Corporation | Panel seal and support structure for fiber optic cable |
| FR2567239A1 (en) * | 1984-07-04 | 1986-01-10 | Capri Codec Sa | Method and stuffing box to provide for the sealing and fixing of a fibre optic cable where it passes through a wall |
-
1978
- 1978-05-25 GB GB2245878A patent/GB1579309A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2510269A1 (en) * | 1981-07-23 | 1983-01-28 | Souriau & Cie | Optical fibre coupling with min. signal losses - uses bore receiving connector pins and cuff around at least one pin |
| FR2520124A1 (en) * | 1982-01-21 | 1983-07-22 | Silec Liaisons Elec | Optical fibre fitting for flame proof box - has metal plug with lined metallic capillary tube carrying fibre through casing of box |
| US4548465A (en) * | 1983-10-11 | 1985-10-22 | Rca Corporation | Panel seal and support structure for fiber optic cable |
| FR2567239A1 (en) * | 1984-07-04 | 1986-01-10 | Capri Codec Sa | Method and stuffing box to provide for the sealing and fixing of a fibre optic cable where it passes through a wall |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19970525 |