GB2179471A - Introducing an optical fibre guide into a tube under fluid pressure - Google Patents
Introducing an optical fibre guide into a tube under fluid pressure Download PDFInfo
- Publication number
- GB2179471A GB2179471A GB08620028A GB8620028A GB2179471A GB 2179471 A GB2179471 A GB 2179471A GB 08620028 A GB08620028 A GB 08620028A GB 8620028 A GB8620028 A GB 8620028A GB 2179471 A GB2179471 A GB 2179471A
- Authority
- GB
- United Kingdom
- Prior art keywords
- optical guide
- tube
- housing
- reel
- fluid
- 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.)
- Granted
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
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4485—Installing in protective tubing by fluid drag during manufacturing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
- H02G1/08—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle through tubing or conduit, e.g. rod or draw wire for pushing or pulling
Abstract
In a method of introducing an optical fibre ribbon R or other flexible optical guide into a preformed tube of an optical cable element, a reel 5 on which the optical fibre ribbon is wound is rotatably mounted within a fluid-tight housing 1 and a leading end of the optical fibre ribbon is fed through an outlet 11 of the housing into one end of the preformed tube. The optical fibre ribbon R is unwound from the reel by a driving mechanism, 15 preferably the rotational speed of the reel 5 being continuously varied between upper and lower limits to produce a stepped or pulsed drive to the ribbon, and a gaseous medium is continuously introduced into the housing. The rate at which the ribbon R is unwound from the reel 5 by the driving mechanism 15 and the pressure and rate at which the gaseous medium is continuously introduced into the housing 1 are such that the ribbon is carried along the tube by a combination of said drive and fluid drag of the gaseous medium until a length of ribbon is loosely housed in and throughout the length of the tube. <IMAGE>
Description
SPECIFICATION
Manufacture of an optical cable element
This invention relates to the manufacture of an optical cable element of the kind consisting of or comprising a tube which extends along the length of the element and in the bore of which at least one optical fibre is so loosely housed that, when the optical cable element is bent or flexed the optical fibre can move transversely and longitudinally within the bore with respect to the element.
It has been proposed to manufacture an optical cable element of this kind by introducing the leading end of a length of optical fibre member into an end of the bore of a preformed tube and by propelling the optical fibre member along the bore of the tube by fluid drag of a gaseous medium which will have no deleterious effect on the optical fibre or on the preformed tube and which is passed through the bore in the desired direction of advance at such a pressure that the length of optical fibre member is carried along the tube until a length of optical fibre member is loosely housed in and throughout the length of the tube. In carrying out this method, it has been proposed to feed the optical fibre member into the inlet end of a tubular feed head, connected to one end of the tube, by means of a pair of rubber drive wheels, driven by a constant torque driving mechanism.The optical fibre member is fed into the inlet end of the feed head through an aperture which is only slightly larger in cross-sectional area than that of the optical fibre member, through the feed head and into the tube. Gaseous medium is fed into the bore of the tubular feed head through a port at a position intermediate of the ends of the feed head and flows from the feed head into the preformed tube. Pushing of the optical fibre member into the tube by the driving mechanism continues until the surface area of the optical fibre member which is exposed to the flow of gaseous medium is sufficiently large to produce a drag force which will cause further advance of the optical fibre member along the tube, the rate of feed being controlled by means of the rubber drive wheels.
We have found that the aforesaid proposed method of manufacturing an optical cable element has the disadvantage that, since it is undesirable to permit an optical fibre member being fed from a source of supply into the feed head through the aperture at the inlet end of the feed head to bear continuously against the wall bounding the aperture, the aperture is made slightly larger than the crosssectional area of the optical fibre member so that there is a leakage of gaseous medium from the feed head such as to cause an undesirable drag force in a direction opposite to that in which advance of the optical fibre is to be effected; the value of such undesirable drag force is proportional to the length of the tube into which an optical fibre member is to be fed.We have also found that when the aforesaid proposed method is employed to manufacture an optical cable element which has an optical fibre ribbon or other lightweight flexible multiple optical fibre guide loosely housed in the tube, the methpd has the further disadvantage that, since the optical fibre ribbon has a substantial surface area, when the gaseous medium is introduced into the tubular feed head through a port intermediate of its ends and initial flow of gqseous medium into the feed head is in a direction transverse to the desired direction of feed of the optical fibre ribbon, the optical fibre ribbon tends to be pressed against the wall of the feed head opposite the port, thereby effecting an undesirable increase in the frictional force that must be overcome in order to produce sufficient fluid drag to cause advance of the optical fibre ribbon along the tube.
It is an object of the present invention to provide an improved method of and apparatus for introducing a lightweight flexible optical guide comprising at least one optical fibre into a preformed tube of an optical cable element.
In the improved method according to the invention, a reel or spool on which a lightweight flexible optical guide comprising at least one optical fibre is wound is rotatably mounted within a substantially fluid-tight housing and the leading end of the optical guide is fed through an outlet of the housing into one end of the preformed tube; the outlet of the housing is directly or indirectly connected to said end of the preformed tube in such a way as to effect a fluid-tight seal; the optical guide is unwound from the reel or spool by a driving mechanism, and a gaseous medium, which will have no deleterious effect on the optical guide or on the preformed tube, is continuously introduced into the fluid-tight housing, the rate at which the optical guide is unwound from the reel or spool by said driving mechanism and the pressure and rate at which said gaseous medium is continuously introduced into the fluid-tight housing being such that the optical guide is carried along the tube by a combination of said drive and fluid drag of the gaseous medium until a length of optical guide is loosely housed in and throughout the length of the tube.
The improved method of the present invention may be employed to feed any form of lightweight flexible optical guide into a preformed tube but it is especially, but not exclusively, suitable for feeding an optical fibre ribbon into a preformed tube.
The reel or spool may be rotatably driven by said driving mechanism and/or, between the reel or spool and the outlet of the housing, the optical guide may pass in contact between a pair of wheels, at least one of which is so rotatably driven by said driving mechanism as to unwind the optical guide from the reel or spool.
Preferably, the rate at which the optical guide is unwound from the reel or spool by said driving mechanism is continuously varied between upper and lower limits to produce a stepped or pulsed drive to the optical guide.
The pressure and flow velocity of the gaseous medium may be maintained substantially constant but, in some circumstances, the pressure and flow velocity of the gaseous medium are continuously varied between upper and lower limits to produce a pulsing effect on the optical guide.
A lightweight body having a transverse cross-sectional area substantially greater than that of the optical guide preferably is attached to the leading end of the optical guide so that the injected gaseous medium bears against the lightweight body and thereby assists in effecting advance of the optical guide along the tube. The lightweight body may be a ball or it may be of flexible form, e.g. similar in shape to a parachute or umbrella, for accommodating any unexpected changes in crosssectional area of the tube. Preferably, the transverse cross-sectional area of the lightweight body is substantially less than that of the tube.
By virtue of the fact that the fluid-tight housing has to be of such a size as to accommodate the reel or spool and hence is very much larger than the tubular outlet in the housing, the position of the port through which the gaseous medium is introduced into the housing is not critical. However, it is preferred either that the gaseous medium is continuously introduced into the fluid-tight housing through a port so positioned that the initial flow of gaseous medium into the housing is in substantially the same direction as the desired direction of feed of the flexible optical guide into the tube or, alternatively, the gaseous medium is continuously introduced into the fluid-tight housing through a port so positioned that the initial flow of gaseous medium into the housing is in substantially the opposite direction to the desired direction of feed of the optical guide into the tube, the internal wall of the housing being so shaped as to deflect the gaseous medium smoothly so that it flows out of the outlet and into the preformed tube.
The preformed tube into which the flexible optical guide is being fed may be the tube of an optical cable element being manufactured in a factory or it may be a tube in an optical cable which has been installed in a building or in an optical cable or overhead electric conductor which has been installed on site.
The invention also includes improved apparatus suitable for effecting the improved method hereinbefore described, which apparatus comprises a substantially fluid-tight housing having an outlet for direct or indirect connection to an end of a preformed tube; a reel or spool on which a lightweight flexible optical guide is wound and which is rotatably mounted within the fluid-tight housing; a pair of wheels which are rotatably mounted in the fluid-tight housing at a position downstream of the reel or spool and between and in contact with which the optical guide can be caused to pass; a driving mechanism operatively coupled to the reel or spool and/or to at least one of said pair of wheels; and, in the wall of the housing, a port and associated gas pressure control means through which a gaseous medium can be introduced into the housing under a controlled pressure and rate.
In a preferred embodiment, the driving mechanism comprises a motor with associated control means for driving the motor at speeds between upper and lower limits to produce a pulsing effect serving to provide an intermittent release of flexible optical guide from the reel or spool and allowing the gaseous medium to carry a preset amount of optical guide per pulse, thereby producing a regular pulsed progression of the optical guide along the tube.
Preferably, the driving mechanism operatively coupled to the reel or spool and/or to at least one of the pair of wheels comprises a d.c. motor which is coupled to the reel or spool and/or wheel via a gearbox of which the gear ratio may be changed. The source of power for the d.c. motor may be the mains or a battery. Where it is desired to drive the motor at speeds between upper and lower limits to produce a pulsing effect, preferably an electromechanical relay with a controllable switching rate to determine the run/dwell periods is interconnected between the source of power and the motor. The relay switching rate may be determined by a programmable or preset controller.
The fluid-tight housing may be directly connected to an end of the preformed tube in such a way as to effect a fluid-tight seal but, preferably, the fluid-tight housing is indirectly connected to an end of the preformed tube by means of a separately formed pipe which is connected to the outlet of the fluid-tight housing and to the tube in such a way as to effect fluid-tight seals. This pipe preferably is of transparent material to enable the feeding of flexible optical guide from the fluid-tight housing into the tube to be continuously monitored. Additionally, or alternatively, the fluidtight housing may have at least one window in its wall and may incorporate an internal lighting system to enable the behaviour of the optical guide and the reel or spool to be continuously monitored, thereby giving an indication of any obstruction in the preformed tube.
The invention is further illustrated by a description, by way of example, of the preferred apparatus for and method of introducing an optical fibre ribbon into the bore of a preformed tube, with reference to the accompanying drawing which shows a diagrammatic side view of the apparatus.
Referring to the drawing, the preferred apparatus comprises a substantially fluid-tight housing 1 of elongate shape having, at one end of the housing, an end wall 2 and, at the other end of the housing, an end wall 3 of hemispherical shape. Mounted in the housing 1 is a pay-off stand 4 on which can be freely pivotally mounted a reel 5 on which is wound an optical fibre ribbon R.
In the end wall 2 of the housing 1 is an inlet port 7 through which pressurised air from a source (not shown) can be introduced into the housing, the rate of introduction of the air being controllable by a valve 8. A visual indication of the pressure of the air within the housing 1 can be given by a pressure meter 9.
Connected to an outlet 11 in the end wall 2 of the housing 1 is a pipe 12 of transparent plastics material for connection to a preformed tube (not shown) into which optical fibre ribbon R from the reel 5 is to be introduced.
Positioned within the housing 1 between the reel 5 and the outlet 11 is a pair of rubber coated pinch wheels 14, one of which can be rotatably driven through a gearbox (not shown) by a 12v d.c. electric motor 15, the leads from the motor passing through a fluidtight seal in an aperture 16 in the end wall 2 via an electromechanical relay (not shown), controlled by a programmable controller, to a power supply (not shown).
The housing 1 may have at least one window in its wall and may incorporate an internal lighting system to enable the behaviour of the optical fibre ribbon R and the reel 5 to be continuously monitored, thereby giving an indication of any obstruction in the preformed tube.
In employing the apparatus shown in the drawing to introduce the optical fibre ribbon R from the reel 5 into a preformed tube, the ribbon is passed from the reel through a guide tube (not shown) between and in contact with the pair of wheels 14, through another guide tube (not shown) and through the pipe 12. A flexible lightweight body (not shown) similar in shape to a parachute or umbrella and having a transverse cross-sectional area substantially greater than that of the ribbon R is attached to the leading end of the ribbon and is introduced into the end of the preformed tube.
The piep 12 is then connected to the preformed tube to effect a fluid-tight seal.
Air under pressure is then introduced into the housing 1 through the inlet port 7 so that the housing is substantially filled with air at a predetermined pressure, the hemi-spherical end wall 3 of the housing being so shaped as to deflect the air smoothly so that it flows towards and out of the outlet 11 through the pipe 12 and into the preformed tube.As the pressure of the air within the housing 1 approaches the required level, the pair of wheels 14 is rotatably driven by the motor 15 at continuously varying speeds between upper and lower limits to produce a pulsing effect serving to provide an intermittant release of optical fibre ribbon R from the reel 5. The rate at which the optical fibre ribbon R is unwound intermittently from the reel 5 by the pair of wheels 14 and the pressure and rate at which air is continuously introduced into the fluidtight housing 1 are such that regular pulsed progression of the optical fibre ribbon along the pipe 12 and into the preformed tube is produced by a combination of the continuously varied drive and fluid drag of the air, the flexible lightweight body at the leading end of the optical fibre ribbon, against which the injected air bears, assisting in effecting advance of the ribbon along the tube. The process is continued until the desired length of optical fibre ribbon R is loosely housed in and throughout the length of preformed tube.
It will be appreciated that the pressure of air introduced into the housing 1 will depend on the relative transverse dimensions of the bore of the preformed tube and of the optical fibre ribbon or other lightweight flexible optical guide and on the length of preformed tube into which the optical fibre ribbon-or other optical guide is to be introduced. By way of example, the pressure of air introduced into the housing preferably lies in the range 50 to 150 p.s.i but pressures substantially greater than this can be employed. Using the aforesaid preferred method and air at a pressure of 75 p.s.i., optical fibre ribbon can be introduced into a preformed tube at a rate greater than 30 metres per minute.
Claims (15)
1. A method of introducing a lightweight flexible optical guide comprising at least one optical fibre into a preformed tube of an optical cable element, wherein a reel or spool on which the lightweight flexible optical guide is wound is rotatably mounted within a substantially fluid-tight housing and the leading end of the optical guide is fed through an outlet of the housing into one end of the preformed tube; the outlet of the housing is directly or indirectly connected to said end of the preformed tube in such a way as to effect a fiuid-tight seal; the optical guide is unwound from the reel or spool by a driving mechanism; and a gaseous medium, which will have no deleterious effect on the optical guide or on the preformed tube, is continuously introduced into the fluid-tight housing, the rate at which the optical guide is unwound from the reel or spool by said driving mechanism and the pressure and rate at which said gaseous medium is continuously introduced into the fluid-tight housing being such that the optical guide is carried along the tube by a combination of said drive and fluid drag of the gaseous medium until a length of optical guide is loosely housed in and throughout the length of the tube.
2. A method of introducing a lightweight flexible optical guide comprising at least one optical fibre into a preformed tube of an optical cable element, wherein a reel or spool on which the lightweight flexible optical guide is wound is rotatably mounted within a substantially fluid-tight housing and the leading end of the optical guide is fed through an outlet of the housing into one end of the preformed tube; the outlet of the housing is directly or indirectly connected to said end of the preformed tube in such a way as to effect a fluid-tight seal; the optical guide is unwound from the reel or spool by a driving mechanism which is continuously varied between upper and lower limits to produce a stepped or pulsed drive to the flexible optical guide as it is unwound; and a gaseous medium, which will have no deleterious effect on the optical guide or on the preformed tube, is continuously introduced into the fluid-tight housing, the rate at which the optical guide is unwound from the reel or spool by said driving mechanism and the pressure and rate at which said gaseous medium is continuously introduced into the fluid-tight housing being such that the optical guide is carried along the tube by a combination of said continuously varied drive and fluid drag of the gaseous medium until a length of optical guide is housed in and throughout the length of the tube.
3. A method as claimed in Claim 1 or 2, wherein the flexible optical guide in its passage between the reel or spool and the outlet of the housing, passes in contact between a pair of wheels, at least one of which is so rotatably driven by said driving mechanism as to unwind the optical guide from the reel or spool.
4. A method as claimed in any one of the preceding Claims, wherein the pressure and flow velocity of the gaseous medium are continuously varied between upper and lower limits to produce a pulsing effect on the optical guide.
5. A method as claimed in any one of the preceding Claims, wherein a lightweight body having a transverse cross-sectional area substantially greater than that of the flexible optical guide is attached to the leading end of the optical guide so that the injected gaseous medium bears against the lightweight body and thereby assists in effecting advance of the optical guide along the tube.
6. A method as claimed in Claim 5, wherein the lightweight body is of flexible form and is similar in shape to a parachute or umbrella.
7. A method as claimed in Claim 5 or 6, wherein the transverse cross-sectional area of the lightweight body is substantially less than that of the tube.
8. A method as claimed in any one of the preceding Claims, wherein the gaseous medium is continuously introduced into the fluidtight housing through a port so positioned that the initial flow of gaseous medium into the housing is in substantially the opposite direction to the desired direction of feed of the optical guide into the tube, the internal wall of the housing being so shaped as to deflect the gaseous medium smoothly so that it flows out of the outlet and into the preformed tube.
9. A method as claimed in any one of the preceding Claims, wherein the preformed tube is a tube in an optical cable which has been installed in a building, or in an optical cable in an overhead electric conductor which has been installed on site.
10. Apparatus for introducing a lightweight flexible optical guide comprising at least one optical fibre into a preformed tube of an optical cable element, which apparatus comprises a substantially fluid-tight housing having an outlet for direct or indirect connection to an end of a preformed tube; a reel or spool on which a lightweight flexible optical guide is wound and which is rotatably mounted within the fluid-tight housing; a pair of wheels which are rotatably mounted in the fluid-tight housing at a position downstream of the reel or spool and between and in contact with which the optical guide can be caused to pass; a driving mechanism operatively coupled to the reel or spool and/or to at least one of said pair of wheels; and, in the wall of the housing, a port and associated gas pressure control means through which a gaseous medium can be introduced into the housing at a controlled pressure and rate.
11. Apparatus as claimed in Claim 10, wherein the driving mechanism comprises a motor with associated control means for driving the motor at speeds between upper and lower limits to produce a pulsing effect serving to provide an intermittent release of flexible optical guide from the reel or spool and allowing the gaseous medium to carry a preset amount of optical guide per pulse, thereby producing regular pulsed progression of the optical guide along the tube.
12. Apparatus as claimed in Claim 11, wherein the control means is an electromechanical relay with a controllable switching rate.
13. Apparatus as claimed in Claim 11 or 12, wherein the motor is coupled to the reel or spool and/or to at least one of the pair of wheels via a gearbox.
14. Apparatus as claimed in any one of
Claims 10 to 13, wherein the fluid-tight housing is indirectly connected to an end of the preformed tube by means of a separately formed pipe which is connected to the outlet of the fluid-tight housing and to the tube in such a way as to effect fluid-tight seals.
15. Apparatus as claimed in Claim 14, wherein the pipe is of transparent material to enable the feeding of flexible optical guide from the fluid-tight housing into the tube to be continuously monitored.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB858520692A GB8520692D0 (en) | 1985-08-19 | 1985-08-19 | Optical cable element |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8620028D0 GB8620028D0 (en) | 1986-10-01 |
| GB2179471A true GB2179471A (en) | 1987-03-04 |
| GB2179471B GB2179471B (en) | 1989-08-02 |
Family
ID=10583966
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB858520692A Pending GB8520692D0 (en) | 1985-08-19 | 1985-08-19 | Optical cable element |
| GB8620028A Expired GB2179471B (en) | 1985-08-19 | 1986-08-18 | Introducing a flexible optical guide into a tube using gaseous pressure |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB858520692A Pending GB8520692D0 (en) | 1985-08-19 | 1985-08-19 | Optical cable element |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8520692D0 (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0323028A1 (en) * | 1987-11-25 | 1989-07-05 | BICC Public Limited Company | Method and apparatus for blowing an optical fibre member |
| GB2212940A (en) * | 1987-11-25 | 1989-08-02 | Bicc Plc | Method and apparatus for blowing an optical fibre member |
| EP0338856A2 (en) * | 1988-04-22 | 1989-10-25 | BICC Public Limited Company | Method of conveying an optical fibre member and an apparatus for use therein |
| EP0354295A2 (en) * | 1988-08-11 | 1990-02-14 | Nippon Steel Welding Products & Engineering Co., Ltd. | Method and apparatus for inserting thread into tube |
| EP0410736A2 (en) * | 1989-07-28 | 1991-01-30 | BICC Public Limited Company | Electric cable installation |
| GB2235595A (en) * | 1989-07-28 | 1991-03-06 | Bicc Plc | Overhead electric and optical transmission system |
| EP0448371A1 (en) * | 1990-03-20 | 1991-09-25 | BICC Public Limited Company | Overhead electric and optical conductor manufacture |
| EP0452088A1 (en) * | 1990-04-09 | 1991-10-16 | Metal Manufactures Limited | Composite electric & optical cable manufacture |
| EP0458607A1 (en) * | 1990-05-22 | 1991-11-27 | BICC Public Limited Company | Overhead electric & optical transmission systems |
| EP0427354A3 (en) * | 1987-04-28 | 1992-03-04 | Koninklijke Ptt Nederland N.V. | Apparatus for introducing a cable into a cable guide tube |
| DE4107321A1 (en) * | 1991-03-07 | 1992-09-10 | Koeolajvezetek Epitoe Vallalat | Optical fibre cable insertion in protective sleeve - using drawing piston displaced along inside of protective sleeve by pulsed water stream |
| EP0389303B1 (en) * | 1989-03-23 | 1996-09-25 | BRITISH TELECOMMUNICATIONS public limited company | Fibre storage |
| US6532839B1 (en) | 1996-03-29 | 2003-03-18 | Sensor Dynamics Ltd. | Apparatus for the remote measurement of physical parameters |
| WO2006003208A1 (en) * | 2004-07-07 | 2006-01-12 | Shell Internationale Research Maatschappij B.V. | Method and system for inserting a fiber optical sensing cable into an underwater well |
| GB2424128A (en) * | 2005-03-08 | 2006-09-13 | Brand Rex Ltd | Blown fibre installation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2122367A (en) * | 1982-05-06 | 1984-01-11 | Standard Telephones Cables Ltd | Laying cables |
| EP0135132A1 (en) * | 1983-08-18 | 1985-03-27 | Kabelwerke Brugg A.-G. | Cable with cable covering, especially a power cable, and method and apparatus for introducing an communication cable thereto |
| US4529172A (en) * | 1982-04-08 | 1985-07-16 | Jeumont-Schneider Corporation | Method and means for installing a cable within a conduit |
-
1985
- 1985-08-19 GB GB858520692A patent/GB8520692D0/en active Pending
-
1986
- 1986-08-18 GB GB8620028A patent/GB2179471B/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4529172A (en) * | 1982-04-08 | 1985-07-16 | Jeumont-Schneider Corporation | Method and means for installing a cable within a conduit |
| GB2122367A (en) * | 1982-05-06 | 1984-01-11 | Standard Telephones Cables Ltd | Laying cables |
| EP0135132A1 (en) * | 1983-08-18 | 1985-03-27 | Kabelwerke Brugg A.-G. | Cable with cable covering, especially a power cable, and method and apparatus for introducing an communication cable thereto |
Cited By (34)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0427354A3 (en) * | 1987-04-28 | 1992-03-04 | Koninklijke Ptt Nederland N.V. | Apparatus for introducing a cable into a cable guide tube |
| GB2212942A (en) * | 1987-11-25 | 1989-08-02 | Bicc Plc | Method and apparatus for blowing an optical fibre member |
| GB2212940A (en) * | 1987-11-25 | 1989-08-02 | Bicc Plc | Method and apparatus for blowing an optical fibre member |
| GB2212940B (en) * | 1987-11-25 | 1992-01-29 | Bicc Plc | Method and apparatus for blowing an optical fibre member |
| GB2212942B (en) * | 1987-11-25 | 1991-10-02 | Bicc Plc | Method and apparatus for blowing an optical fibre member |
| US4990033A (en) * | 1987-11-25 | 1991-02-05 | Handley Graham R | Method and apparatus for blowing an optical fibre member |
| EP0323028A1 (en) * | 1987-11-25 | 1989-07-05 | BICC Public Limited Company | Method and apparatus for blowing an optical fibre member |
| US5065928A (en) * | 1987-11-25 | 1991-11-19 | Bicc Plc. | Method and apparatus for blowing an optical fibre member |
| AU614100B2 (en) * | 1987-11-25 | 1991-08-22 | Brand-Rex Limited | Apparatus for blowing an optical fibre member |
| EP0338856A2 (en) * | 1988-04-22 | 1989-10-25 | BICC Public Limited Company | Method of conveying an optical fibre member and an apparatus for use therein |
| EP0338856A3 (en) * | 1988-04-22 | 1990-06-06 | BICC Public Limited Company | Method of conveying an optical fibre member and an apparatus for use therein |
| EP0354295A3 (en) * | 1988-08-11 | 1991-08-21 | Nippon Steel Welding Products & Engineering Co., Ltd. | Method and apparatus for inserting thread into tube |
| EP0354295A2 (en) * | 1988-08-11 | 1990-02-14 | Nippon Steel Welding Products & Engineering Co., Ltd. | Method and apparatus for inserting thread into tube |
| EP0389303B1 (en) * | 1989-03-23 | 1996-09-25 | BRITISH TELECOMMUNICATIONS public limited company | Fibre storage |
| GB2235595A (en) * | 1989-07-28 | 1991-03-06 | Bicc Plc | Overhead electric and optical transmission system |
| AU629964B2 (en) * | 1989-07-28 | 1992-10-15 | Corning Communications Limited | Electric cable installation |
| EP0410736A2 (en) * | 1989-07-28 | 1991-01-30 | BICC Public Limited Company | Electric cable installation |
| GB2235595B (en) * | 1989-07-28 | 1993-11-03 | Bicc Plc | Overhead electrical and optical transmission systems |
| EP0410736A3 (en) * | 1989-07-28 | 1992-03-18 | Bicc Public Limited Company | Electric cable installation |
| US5123075A (en) * | 1989-07-28 | 1992-06-16 | Bicc Plc | Overhead electric and optical transmission systems |
| AU627608B2 (en) * | 1989-07-28 | 1992-08-27 | Bicc Public Limited Company | Overhead electric and optical transmission systems |
| AU632912B2 (en) * | 1990-03-20 | 1993-01-14 | Bicc Public Limited Company | Overhead electric and optical conductor manufacture |
| EP0448371A1 (en) * | 1990-03-20 | 1991-09-25 | BICC Public Limited Company | Overhead electric and optical conductor manufacture |
| EP0452088A1 (en) * | 1990-04-09 | 1991-10-16 | Metal Manufactures Limited | Composite electric & optical cable manufacture |
| EP0458607A1 (en) * | 1990-05-22 | 1991-11-27 | BICC Public Limited Company | Overhead electric & optical transmission systems |
| DE4107321A1 (en) * | 1991-03-07 | 1992-09-10 | Koeolajvezetek Epitoe Vallalat | Optical fibre cable insertion in protective sleeve - using drawing piston displaced along inside of protective sleeve by pulsed water stream |
| US6532839B1 (en) | 1996-03-29 | 2003-03-18 | Sensor Dynamics Ltd. | Apparatus for the remote measurement of physical parameters |
| US6817257B2 (en) | 1996-03-29 | 2004-11-16 | Sensor Dynamics Limited | Apparatus for the remote measurement of physical parameters |
| WO2006003208A1 (en) * | 2004-07-07 | 2006-01-12 | Shell Internationale Research Maatschappij B.V. | Method and system for inserting a fiber optical sensing cable into an underwater well |
| GB2430958A (en) * | 2004-07-07 | 2007-04-11 | Shell Int Research | Method and system for inserting a fiber optical sensing cable into an underwater well |
| GB2430958B (en) * | 2004-07-07 | 2008-12-03 | Shell Int Research | Method and system for inserting a fiber optical sensing cable into an underwater well |
| US7699103B2 (en) | 2004-07-07 | 2010-04-20 | Shell Oil Company | Method and system for inserting a fiber optical sensing cable into an underwater well |
| GB2424128A (en) * | 2005-03-08 | 2006-09-13 | Brand Rex Ltd | Blown fibre installation |
| GB2424128B (en) * | 2005-03-08 | 2007-03-14 | Brand Rex Ltd | Optical fibre installation apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8620028D0 (en) | 1986-10-01 |
| GB8520692D0 (en) | 1985-09-25 |
| GB2179471B (en) | 1989-08-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |