GB2392253A - Optic fibre cable elastomeric blocking device with bore of two diameters - Google Patents

Optic fibre cable elastomeric blocking device with bore of two diameters Download PDF

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Publication number
GB2392253A
GB2392253A GB0313279A GB0313279A GB2392253A GB 2392253 A GB2392253 A GB 2392253A GB 0313279 A GB0313279 A GB 0313279A GB 0313279 A GB0313279 A GB 0313279A GB 2392253 A GB2392253 A GB 2392253A
Authority
GB
United Kingdom
Prior art keywords
cable
blocking device
passage
section
sheath
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
Application number
GB0313279A
Other versions
GB2392253B (en
GB0313279D0 (en
Inventor
Matthew Badman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spirent PLC
Original Assignee
Spirent PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Spirent PLC filed Critical Spirent PLC
Publication of GB0313279D0 publication Critical patent/GB0313279D0/en
Priority to EP03255090A priority Critical patent/EP1394588A3/en
Publication of GB2392253A publication Critical patent/GB2392253A/en
Application granted granted Critical
Publication of GB2392253B publication Critical patent/GB2392253B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G02B6/4439—Auxiliary devices
    • G02B6/4471—Terminating devices ; Cable clamps
    • G02B6/4477—Terminating devices ; Cable clamps with means for strain-relieving to interior strengths element

Abstract

A blocking device for an optical fibre cable comprises a body 10 of elastomeric material formed with a through-passage, the through-passage having a section for receiving and embracing a sheathed cable and a reduced diameter section for receiving and embracing a length of cable from which the cable sheath 21 has been removed. Entry port P, in a splice storage tray, having spaced ribs 30, 32 and intermediate ribs 31 grooves 12, tapering portions 13, 14 and centre portion 11 of rectangular cross-sections are shown. The optic fibres may be enclosed within a coating or inner sheath 22.

Description

Blocking device for optical fibre cable The present invention relates to a
blocking device for optical fibre cables entering a splice enclosure.
Typically optical fibre cables entering a splice enclosure comprise a number of optical fibres enclosed within 5 a tubular sheath: there may be a single fibre, or two fibres, or in general any number of fibres, but commonly up to 8 to 12 fibres. There is a risk that the cable sheath may become damaged, at some point along the length of the cable, then with the risk that water or grease might migrate along the cable, 10 under the sheath, and emerge into the splice enclosure through the end of the sheath.
We have now devised a device for preventing water or grease migrating along the optical fibre cable and emerging into the splice closure.
15 In accordance with the present invention, there is provided a blocking device for an optical fibre cable, the cable comprising one or more optical fibres enclosed within a tubular sheath, the blocking device comprising a body of elastomeric material which is formed with a throughpassage, 20 the through-passage having a section for receiving and embracing the sheached-ciable and a reduced-diameter section for receiving and embracing a length of cable from which the cable sheath has been removed.
Preferably opposite sides of the body of the device are 25 formed with grooves, arranged for engagement by ribs in the opposite sides of an entry port of a splice storage tray.
Preferably the body of the device includes a portion projecting from at least one of its opposite ends, the through-
passage extending through this projecting portion, to provide 30 support for the cable.
Preferably, the reduced-diameter section of the through-passage is adjacent one end of this passage.
An embodiment of the present invention will now be described by way of example only and with reference to the
accompanying drawings, in which: Figure 1 is an enlarged, longitudinal section through a blocking device in accordance with the invention; Figure 2 is a further-enlarged sectional view of part 5 of the bore through the blocking device of Figure 1; Figure 3 is a similar view to Figure 1, showing the end of an optical fibre cable prepared for insertion through the blocking device; and Figure 4 is a longitudinal section through the blocking 10 device, shown with the end of the optical fibre cable passed through the device and the device inserted into an entry port of a splice storage tray of an enclosure.
Referring to Figure 1 of the drawings, there is shown a blocking device which comprises a body 10 of elastomeric 15 material, the body 10 having a centre portion 11 of rectangular cross-section, with grooves 12 in its opposite sides and tapering portions 13, 14 projecting from its opposite ends. A bore or passage 15 extends through the body 10, from end-to-end along its longitudinal axis. As shown more clearly in Figure 20 2, bore or passage 15 includes a reduced-diameter section 15a adjacent one end, joining the remainder 15b of the passage 15 via a tapered section 15c. In the example shown, the main section 15b of the passage 15 has a diameter in the range of 1.7 to 2.Omm, whilst the reduced-diameter section 15a has a 25 diameter in the range of 0.8 to 1.lmm.
In use, an optical fibre cable 20 is passed into a splice enclosure, through a cable locking and sealing device inserted into a port in the base of the enclosure: typically the cable locking and sealing device comprises a device in 30 accordance with our UK patent No. 2,277,206. The end of the cable 20 is then prepared and passed through the passage IS in the blocking device lo: firstly, as shown in Figure 3, an end section of the cable sheath 21 is cut back, to reveal the end sections of the optical fibres enclosed within a coating or 35 inner sheath 22. In the example under discussion, the cable
comprises 2 optical fibres, each typically of 0.8mm, enclosed within an outer sheath 21 typically of 1.8mm outer diameter.
Further, a strain-relieving filament (not shown) extends longitudinally of the cable, alongside the fibres, and the end 5 section of this is cut away. The inner sheath 22 of the cable is then lubricated with a rubber lubricant and the cable end is passed through the passage 15 in the blocking device.
The final position of the cable is shown in Figure 4, in which the end of the outer sheath 21 is located within the 10 larger-diameter main section 15b of the bore or passage 15, and the optical fibres, enclosed within their coating or inner sheath 22, lie within the reduced-diameter end section 15a of the passage 15, and are embraced by the surrounding material of the body, typically over a length of 5 or 6mm. In this way, 15 the blocking device seals around the end of the outer cable sheath 21 and also seals around the coating or inner sheath 22 which encloses the optical fibres, and so prevents any water or grease, migrating along the cable within its sheath, from entering the enclosure.
20 Once the cable has been inserted into the sealed position shown in Figure 4, the blocking device is inserted into an entry port P in a splice storage tray: the port P comprises an open-top channel, having opposite walls formed with spaced-apart ribs 30, 32 and with intermediate ribs 31.
25 The blocking device is inserted into the port P so that the ribs 31 of the port engage into the grooves 12 of the blocking device, and the opposite ends of the centre section 11 of the blocking device locate between the ribs 30, 32 of the port.
It will be appreciated that the tapering portions 13, 30 14, projecting from the opposite ends of the centre section 11 of the device, serve to provide reinforcement for protecting the cable against excessive bending where it enters or leaves the device.
Further, the application of lubricant to the end of 35 the cable, serves to fill the annular space between the outside
of the inner sheath 22 and the inner surface of the larger-
diameter section 15b of the through-passage 15, extending from the cutback end of the outer sheath 21 to the adjacent end of the reduceddiameter section 15a of the through-bore.

Claims (1)

  1. Claims
    1) A blocking device for an optical fibre cable, the cable comprising one or more optical fibres enclosed within a tubular sheath, the blocking device comprising a body of elastomeric 5 material which is formed with a through-passage, the through-
    passage having a section for receiving and embracing the sheathed-cable and a reduced-diameter section for receiving and embracing a length of cable from which the cable sheath has been removed.
    10 2) A blocking device as claimed in claim 1, in which opposite sides of said body are formed with transverse grooves.
    3) A blocking device as claimed in claim 1 or 2, in which said reduceddiameter section of said through-passage is disposed adjacent one end of said passage.
    15 4) A blocking device as claimed in any preceding claim, in which said body includes a portion projecting from at least one of its opposite ends, said through-passage extending through said projecting portion to provide support for the cable passed through said passage.
    20 5) A blocking device substantially as herein described with reference to the accompanying drawings.
GB0313279A 2002-08-20 2003-06-09 Blocking device for optical fibre cable Expired - Fee Related GB2392253B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03255090A EP1394588A3 (en) 2002-08-20 2003-08-15 Blocking device for optical fibre cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0219324A GB0219324D0 (en) 2002-08-20 2002-08-20 Blocking device for optical fibre cable

Publications (3)

Publication Number Publication Date
GB0313279D0 GB0313279D0 (en) 2003-07-16
GB2392253A true GB2392253A (en) 2004-02-25
GB2392253B GB2392253B (en) 2005-07-13

Family

ID=9942609

Family Applications (2)

Application Number Title Priority Date Filing Date
GB0219324A Ceased GB0219324D0 (en) 2002-08-20 2002-08-20 Blocking device for optical fibre cable
GB0313279A Expired - Fee Related GB2392253B (en) 2002-08-20 2003-06-09 Blocking device for optical fibre cable

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB0219324A Ceased GB0219324D0 (en) 2002-08-20 2002-08-20 Blocking device for optical fibre cable

Country Status (1)

Country Link
GB (2) GB0219324D0 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2425365A (en) * 2005-04-23 2006-10-25 British Engines Ltd Seal for cable gland assembly and tool therefor
WO2014139102A1 (en) * 2013-03-13 2014-09-18 3M Innovative Properties Company Sealing tube for cable entry port

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0024959A1 (en) * 1979-08-22 1981-03-11 The Bendix Corporation Connector for optical waveguides
US4279469A (en) * 1975-05-27 1981-07-21 The United States Of America As Represented By The Secretary Of The Navy Separable fiber optic cable connector
GB2165401A (en) * 1984-09-05 1986-04-09 Allied Corp Connector assembly
GB2243224A (en) * 1990-03-14 1991-10-23 Smiths Industries Plc Optical fibre passing through microwave absorptive insert
US5097523A (en) * 1989-11-06 1992-03-17 Radiall Device for sealing the entry of a cable into an alveolar multicontact connector
GB2277206A (en) * 1993-04-14 1994-10-19 Victoria Ann Foss Cable sealing and locking device
GB2298527A (en) * 1995-03-01 1996-09-04 Bowthorpe Plc Cable sealing and locking device
WO1997041474A1 (en) * 1996-04-30 1997-11-06 The Whitaker Corporation Grommet for a fiber optic enclosure
US5848814A (en) * 1997-06-24 1998-12-15 General Motors Corporation Spring seal
US6113420A (en) * 1997-06-18 2000-09-05 Harting Kgaa Tension-relieving arrangement for the electrical and/or optical conductors of a cable
US6315461B1 (en) * 1999-10-14 2001-11-13 Ocean Design, Inc. Wet mateable connector

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5113464A (en) * 1991-06-24 1992-05-12 Hughes Aircraft Company Method of producing an optical fiber terminus for high temperature use
JP3571863B2 (en) * 1996-10-16 2004-09-29 古河電気工業株式会社 Method for setting optical fiber protrusion length of optical connector and jig thereof

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4279469A (en) * 1975-05-27 1981-07-21 The United States Of America As Represented By The Secretary Of The Navy Separable fiber optic cable connector
EP0024959A1 (en) * 1979-08-22 1981-03-11 The Bendix Corporation Connector for optical waveguides
GB2165401A (en) * 1984-09-05 1986-04-09 Allied Corp Connector assembly
US5097523A (en) * 1989-11-06 1992-03-17 Radiall Device for sealing the entry of a cable into an alveolar multicontact connector
GB2243224A (en) * 1990-03-14 1991-10-23 Smiths Industries Plc Optical fibre passing through microwave absorptive insert
GB2277206A (en) * 1993-04-14 1994-10-19 Victoria Ann Foss Cable sealing and locking device
GB2298527A (en) * 1995-03-01 1996-09-04 Bowthorpe Plc Cable sealing and locking device
WO1997041474A1 (en) * 1996-04-30 1997-11-06 The Whitaker Corporation Grommet for a fiber optic enclosure
US6113420A (en) * 1997-06-18 2000-09-05 Harting Kgaa Tension-relieving arrangement for the electrical and/or optical conductors of a cable
US5848814A (en) * 1997-06-24 1998-12-15 General Motors Corporation Spring seal
US6315461B1 (en) * 1999-10-14 2001-11-13 Ocean Design, Inc. Wet mateable connector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2425365A (en) * 2005-04-23 2006-10-25 British Engines Ltd Seal for cable gland assembly and tool therefor
WO2014139102A1 (en) * 2013-03-13 2014-09-18 3M Innovative Properties Company Sealing tube for cable entry port

Also Published As

Publication number Publication date
GB2392253B (en) 2005-07-13
GB0219324D0 (en) 2002-09-25
GB0313279D0 (en) 2003-07-16

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20070609