WO1996018228A1 - Cable glands - Google Patents
Cable glands Download PDFInfo
- Publication number
- WO1996018228A1 WO1996018228A1 PCT/GB1995/002871 GB9502871W WO9618228A1 WO 1996018228 A1 WO1996018228 A1 WO 1996018228A1 GB 9502871 W GB9502871 W GB 9502871W WO 9618228 A1 WO9618228 A1 WO 9618228A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- armour
- gland
- cable
- cone
- ring
- Prior art date
Links
Classifications
-
- 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
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
- H02G15/04—Cable-end sealings
Definitions
- Cable Glanas This invention relates to cable glands, and more especially to glands for electric (and/or optical) cables having a metallic protective layer (hereinafter for simplicity called “armour”) of wires, tape, or braid.
- a metallic protective layer hereinafter for simplicity called “armour"
- Such armour needs to be mechanically secured and electrically earthed in the glands used to terminate the cable, and this is almost always done by gripping the armour between male and female frustoconical surfaces on members (respectively known as the armour cone and armour ring) that are urged axially towards each other by the action of at least one additional screw-threaded member when the gland is assembled.
- the armour cone and armour ring members that are urged axially towards each other by the action of at least one additional screw-threaded member when the gland is assembled.
- a cable gland for use with cables having armour of widely differing thickness comprises a body and a gland nut threaded to the body which together enclose an armour grip comprising an armour cone having a male frustoconical surface co-operating with a female frustoconical surface on an armour ring and is characterised by the said frustoconical surfaces having substantially equal se iangles in the range 14-20° and the armour ring and the armour cone being urged together by a mechanism independent of and contained within the gland nut.
- the armour cone may be an integral (monolithic) projection of the gland body.
- the gland body may enclose an inner seal for engaging an inner sheath or bedding layer beneath the armour of the cable and/or the gland nut may enclose an outer seal for engaging an outer sheath (or oversheath) surrounding the armour.
- the said semiangle is in the range 14-18 .
- the length of relative longitudinal movement required to accomodate differences in thickness of different armour types is anagable, and the independent mechanism urging the armour cone and armour ring together overcomes the loss of self-locking action and makes intentional dis-assembly easier.
- the mechanism for urging the armour cone and the armour ring together is a direct screw-threaded connection between the armour ring and the body, or between the armour ring an the armour cone; alternatively a separate driver member screwed to the body or cone may be used.
- the ring or the driver member When the ring or the driver member is directly threaded to the body, it has the advantage that the performance of the gland in "deluge” tests is improved and in some cases an external deluge seal (which is vulnerable to damage; can be dispensed with.
- the gland includes an outer seal
- the armour ring or driver member preferably extends to and engages that seal.
- the armour can be adequately gripped by screwing the armour ring "finger tight", but preferably the armour ring or the driver member is provided with a suitable formation for engagement with a spanner, wrench or other tool. This may, for example, be a pair (or more than one pair) of flats, one or more than one bore, or simply a knurled gripping surface.
- Figu e 1 The termination of Figu e 1 is made on a cable 1 having an inner sheath 2, armour 3 and an outer sheath 4 and includes a gland comprising a body 5 enclosing an inner seal 6, a gland nut 7 in screw-threaded engagement with the body 5 and enclosing an outer seal 8, and an armour grip 9.
- the body, gland nut and outer seal are broadly conventional in design, and the inner seal 6 is more fully described in another application filed on the same day as this application claiming the priority of GB9424684.0 filed 7 December 1995 (07.12.95) .
- the armour grip comprises an armour cone 10 and an armour ring 11.
- the cone 10 is contained by the gland body 5, since a shoulder 12 in the body, acting via the inner seal 6, limits the movement of the cone to the right as drawn, that is in the direction away from its apex.
- the semiangle « of the cone is about 17.0°.
- the armour ring 11 has a matching semiangle and is urged towards the cone 10 by direct screw-threaded engagement with the gland body 5.
- the ring 11 has an extension with a peripheral surface 13 that is knurled to facilitate tightening of the screw thread by hand or by the 5 use of a friction-grip wrench (alternatively, or in addition, it may have a pair of flats for engagement with a spanner) , and it is long enough to reach and be sealed by the outer seal 8.
- a friction-grip wrench alternatively, or in addition, it may have a pair of flats for engagement with a spanner
- the difference in 10 the relative axial positions when the gland is tightened on different thicknesses of armour is substantially less than for conventional armour grips with conventional cone angles in the 6-9° range - typically in the region of half the difference.
- the difference in relative axial positions when the gland is tightened on a steel tape armour 0 with a nominal radial thickness of 0.15mm or on a single wire armour with a nominal radial thickness of 3.15mm is no more than 4.3mm (compared with about 9.7mm if the cone angle were a conventional 6°) .
- the gland passes the ERA Technology Ltd/Shell deluge test DT SOI;1991 for offshore cable glands without requiring an external deluge seal.
- the cable end is prepared ("cut back") in an entirely conventional manner and the gland nut 7 and armour ring 11 unscrewed and slid over the cable end (together with the outer seal 3) .
- the cable end is then inserted through the body cf the gland, and through the inner seal and armour cone within it, and the end of the armour 3 positioned radially between the armour cone and the body (or with some types of armour, it may be preferable to separate the cone from the body and insert it under the armour in a preliminary step) .
- the armour ring 11 is threaded into the body and tightened by hand, finishing with a slight turn with a wrench if preferred, and the gland nut screwed onto the body and tightened to complete the termination.
- the armour grip is independent of the gland nut 7, the latter can be unscrewed for visual inspection and/or mechanical testing, without risk of the cable end becoming displaced.
- Figure 2 shows a modification in which the armour ring 14 is a simple collet secured in place by a separate driver member 15 directly threaded in the body 5.
- Figure 3 shows a further modification in which the driver member 16 is threaded on, instead of n, the body 5; the spacer 17 may be integral (monolithic) with the driver member or it may (as drawn) be separate; in the latter case it may be of hard plastics material if desired and may be bonded to the driver member (or to the outer seal, if preferred) to reduce the number cf components to be positioned.
Landscapes
- Cable Accessories (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95939358A EP0796516A1 (en) | 1994-12-07 | 1995-12-07 | Cable glands |
AU41217/96A AU4121796A (en) | 1994-12-07 | 1995-12-07 | Cable glands |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9424685.7 | 1994-12-07 | ||
GB9424685A GB9424685D0 (en) | 1994-12-07 | 1994-12-07 | Cable glands |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996018228A1 true WO1996018228A1 (en) | 1996-06-13 |
Family
ID=10765546
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1995/002871 WO1996018228A1 (en) | 1994-12-07 | 1995-12-07 | Cable glands |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0796516A1 (en) |
AU (1) | AU4121796A (en) |
CA (1) | CA2207215A1 (en) |
GB (1) | GB9424685D0 (en) |
WO (1) | WO1996018228A1 (en) |
ZA (1) | ZA9510313B (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1163901A (en) * | 1965-12-10 | 1969-09-10 | Roy Alfred Blundell | Cable Gland |
FR2371077A1 (en) * | 1976-11-10 | 1978-06-09 | Capri Codec Sa | CABLE ARMOR ANCHORING DEVICE |
GB2240436A (en) * | 1989-12-14 | 1991-07-31 | Pratley Investments | Shroud for a cable gland |
GB2253530A (en) * | 1988-04-13 | 1992-09-09 | Cmp | Improvements in cable glands |
GB2269710A (en) * | 1992-08-11 | 1994-02-16 | Hawke Cable Glands Ltd | Cable gland |
-
1994
- 1994-12-07 GB GB9424685A patent/GB9424685D0/en active Pending
-
1995
- 1995-12-05 ZA ZA9510313A patent/ZA9510313B/en unknown
- 1995-12-07 WO PCT/GB1995/002871 patent/WO1996018228A1/en not_active Application Discontinuation
- 1995-12-07 AU AU41217/96A patent/AU4121796A/en not_active Abandoned
- 1995-12-07 CA CA 2207215 patent/CA2207215A1/en not_active Abandoned
- 1995-12-07 EP EP95939358A patent/EP0796516A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1163901A (en) * | 1965-12-10 | 1969-09-10 | Roy Alfred Blundell | Cable Gland |
FR2371077A1 (en) * | 1976-11-10 | 1978-06-09 | Capri Codec Sa | CABLE ARMOR ANCHORING DEVICE |
GB2253530A (en) * | 1988-04-13 | 1992-09-09 | Cmp | Improvements in cable glands |
GB2240436A (en) * | 1989-12-14 | 1991-07-31 | Pratley Investments | Shroud for a cable gland |
GB2269710A (en) * | 1992-08-11 | 1994-02-16 | Hawke Cable Glands Ltd | Cable gland |
Also Published As
Publication number | Publication date |
---|---|
GB9424685D0 (en) | 1995-02-01 |
CA2207215A1 (en) | 1996-06-13 |
AU4121796A (en) | 1996-06-26 |
ZA9510313B (en) | 1996-05-13 |
EP0796516A1 (en) | 1997-09-24 |
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