GB2250644A - Cable gland - Google Patents
Cable gland Download PDFInfo
- Publication number
- GB2250644A GB2250644A GB9114721A GB9114721A GB2250644A GB 2250644 A GB2250644 A GB 2250644A GB 9114721 A GB9114721 A GB 9114721A GB 9114721 A GB9114721 A GB 9114721A GB 2250644 A GB2250644 A GB 2250644A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cable gland
- cable
- plastics material
- nipple
- nut
- 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
- 210000004907 gland Anatomy 0.000 title claims abstract description 96
- 239000000463 material Substances 0.000 claims abstract description 64
- 239000004033 plastic Substances 0.000 claims abstract description 59
- 229920003023 plastic Polymers 0.000 claims abstract description 59
- 210000002445 nipple Anatomy 0.000 claims abstract description 29
- 230000006835 compression Effects 0.000 claims abstract description 27
- 238000007906 compression Methods 0.000 claims abstract description 26
- 239000004020 conductor Substances 0.000 claims abstract description 15
- 239000007769 metal material Substances 0.000 claims description 9
- 229910001369 Brass Inorganic materials 0.000 claims description 5
- 239000010951 brass Substances 0.000 claims description 5
- 229920000515 polycarbonate Polymers 0.000 claims description 5
- 239000004417 polycarbonate Substances 0.000 claims description 5
- 239000012815 thermoplastic material Substances 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 229920003052 natural elastomer Polymers 0.000 claims description 2
- 229920001194 natural rubber Polymers 0.000 claims description 2
- 229920003051 synthetic elastomer Polymers 0.000 claims description 2
- 239000005061 synthetic rubber Substances 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000009972 noncorrosive effect Effects 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
- H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
- H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
- H01R9/0521—Connection to outer conductor by action of a nut
-
- 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
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
- H02G3/0616—Joints for connecting tubing to casing
- H02G3/0625—Joints for connecting tubing to casing with means for preventing disengagement of conductors
- H02G3/0675—Joints for connecting tubing to casing with means for preventing disengagement of conductors with bolts operating in a direction parallel to the conductors
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Installation Of Indoor Wiring (AREA)
Abstract
A cable gland 10 for attaching a cable 18 to an apparatus (not shown) consists of a cable gland body 12 including a nipple 14, a compression nut 16, a cone bush 22 and a cone ring 24 for gripping the armouring 20 of the cable 18. The cable gland body 12 is made of a plastics material while the nipple 14 is made of an electrically conductive material or of a plastics supporting electrically conductive strips, so as to provide electrical continuity between the armouring 20 of the cable 18 and the apparatus in use. The compression nut 16 may also be made of a plastics material. The plastics material can be transparent. <IMAGE>
Description
"DIFFERENTIATED MATERIAL CABLE GLAND"
This invention relates to a cable gland for a attaching an armoured cable to an apparatus.
Generally, the various parts of cable glands for attaching an armoured cable to an apparatus, i.e. the cable gland body, the compression nut and the armour wire or armouring gripping means, e.g. a cone bush and cone ring assembly, have been made from a metallic material such as brass.
However, these cable glands suffer from the disadvantage that they are prone to corrosion in use, which can lead to mechanical or electrical failure. Further, brass is a relatively expensive material and thus this increases the cost of such cable glands.
To overcome the problem of corrosion, cable glands have been made where certain of the metallic parts of the cable gland are encased in a noncorrosive plastics material. For example, it is known to encase a metallic cable gland body and a metallic compression nut in a suitable plastics material. However, these cable glands still involve the use of a substantial quantity of metallic material.
There is thus a need for a cable gland which is resistant to corrosion and which contains a minimal amount of a metallic material.
According to the invention there is provided a cable gland for attaching an armoured cable to an apparatus comprising: a cable gland body which is internally or externally threaded and includes an externally threaded nipple for attaching the cable gland to the apparatus and is adapted to receive holding means for holding the armouring of the cable in use, a compression nut which is externally or internally threaded to co-operate with the internal or external thread respectively of the cable gland body to compress the holding means to hold the armouring of the cable in use is characterised in that the cable gland body is formed of a plastics material and in that at least a part of the nipple in contact with the holding means and with the apparatus in use is formed of an electrically conductive material.
In one embodiment of the invention, the whole of the nipple of the cable gland body is formed of an electrically conductive material attached to the plastics material of the cable gland body.
In another embodiment of the invention the nipple is formed of a plastics material having one or more strips of an electrically conductive material attached to the plastics material, the one or more strips being in contact with the holding means and with the apparatus in use.
The electrically conductive material may be a metallic material, preferably brass.
Preferably, the compression nut of the cable gland is also formed of a plastics material.
The compression nut may also include a section remote from the cable gland body in use which is internally or externally threaded and the cable gland may include a back nut which is complementarily threaded to the section of the compression nut, and an annular seal, so that when the back nut is screwed on to or in to the compression nut in use, the annular seal is compressed on to the cable.
Preferably, the back nut is formed of a plastics material.
The cable gland of the invention may also include a lock nut for screwing on to the nipple in use to secure the cable gland to the apparatus and the lock nut may also be formed of a plastics material, or may be formed of a plastics material having one or more strips of an electrically conductive material attached to the plastics material.
The plastics material may be a thermoplastic material or a thermosetting material. The preferred plastics material is a thermoplastic material such as a high impact resistance polycarbonate.
The plastics material may be a clear plastics material so that the interior of the cable gland may be viewed in use.
According to another aspect of the invention there is provided a cable gland for attaching an armoured cable to an apparatus comprising: a cable gland body which is internally or externally threaded and includes an externally threaded nipple for attaching the cable gland to the apparatus and is adapted to receive holding means for holding the armouring of the cable in use, a compression nut which is externally or internally threaded to co-operate with the internal or external thread respectively of the cable gland body to compress the holding means to hold the armouring of the cable in use is characterised in that the compression nut is formed of a plastics material.
Figure 1 is a sectioned side view of a first cable gland according to the invention in position on an armoured cable;
Figure 2 is a sectioned side view of a second cable gland according to the invention in position on an armoured cable;
Figure 3 is a view on the arrow A of the cable gland and cable of Figure 2; and
Figure 4 is a sectioned side view of a third cable gland according to the invention in position on an armoured cable.
The crux of the present invention is that at least the cable gland body and/or the compression nut and if present the back nut and lock nut of a cable gland are made of a plastics material. However, at least a part of the nipple of the cable gland body which in use is in contact with the holding means and with the apparatus is formed of an electrically conductive material to provide electrical continuity between the armouring of the cable and the apparatus in use.
Referring to Figure 1 there is shown a cable gland 10 comprising a cable gland body 12 which is internally threaded and which includes an externally threaded nipple 14, a compression nut 16 which is externally threaded to co-operate with the internal thread of the cable gland body 12, the cable gland 10 being located on a cable 18 including armour wires or armouring 20. In use, the armouring 20 is gripped by means of a cone bush 22 and a cone ring 24 in a conventional manner.
The cable gland body 12 is formed of a plastics material with the nipple 14 being formed wholly of a metallic material. The nipple 14 may be moulded into the plastics material of the cable gland body 12 or may be an interference fit in the plastics material of the cable gland body 12 or may be attached to the plastics material of the cable gland body 12 by a suitable adhesive. It can be seen that as the whole of the nipple 14 is formed of a metallic material, electrical continuity is maintained between the armouring 20 of the cable 18 via the metallic cone bush 22 and cone ring 24 and the metallic nipple 14 which in turn will be attached to apparatus (not shown) in use.
Referring to Figure 2, there is shown a cable gland 30 located on a cable 32 which includes armouring 34. The cable gland 30 is substantially the same as the cable gland 10 of Figure 1 in that it includes a cable gland body 36, a nipple 38, a compression nut 40, a cone bush 42 and a cone ring 44.
The nipple 38 of the cable gland 30 is formed of a plastics material having a series of metallic strips 46 embedded in the plastics material. In use, the metallic strips 46 are in contact with the metallic cone ring 42 which in turn is in contact with the armouring 34 of the cable 32, and the strips 46 are in contact with the apparatus to which the cable gland 30 is attached, so as to provide electrical continuity between the armouring 34 and the apparatus.
Referring to Figure 4, there is shown a cable gland 60 which is substantially the same as the cable gland 10 of Figure 1 except for details of the compression nut 62. The compression nut 62 includes a section 64 which is externally threaded and which is adapted to co-operate with an internal thread of a back nut 66. When the back nut 66 is screwed on to the section 64 of compression nut 62 an annular elastomeric seal 68 is compressed on to the outer sheath of the cable 70 to provide a seal. The compression nut 62 and the back nut 66 are also made of a plastics material.
The cable gland 60 also includes a lock nut 72 for securing the cable gland 60 to apparatus in use. The lock nut 72 is also made of a plastics material.
The plastics material from which the cable gland body, the compression nut, the back nut and the lock nut are made may be a thermoplastic plastics material or a thermosetting plastics material or a hard natural or synthetic rubber material. The plastics material may be unfilled or filled or reinforced. Examples of suitable plastics materials include polycarbonate, preferably high impact resistance polycarbonate, polypropylene, polyvinylchloride, high density polyethylene, ultra-high density polyethylene, ABS, polyurethane and EPDM/polypropylene mixture. The preferred plastics material is polycarbonate.
The plastics material is preferably a clear plastics material so that the interior of the cable gland may be viewed in use. This enables a person to check that the seals of the cable gland are sealing in use, whether any moisture has entered the cable gland, and whether there is any corrosion or misplacement of the armouring of the cable.
When the plastic parts of the cable gland are made of a thermoplastic material, then they may be made by injection moulding. On the other hand, when the plastic parts of the cable gland are made of a thermosetting plastics material, then they may be made by compression or injection moulding. As an alternative, the plastic parts of the cable gland may be made by reaction moulding.
The electrically conductive part or parts of the nipple of the cable gland body may be made of any suitable electrically conductive material, for example an electrically conductive plastics material or a metallic material.
Preferably, the electrically conductive part or parts of the nipple are made of brass.
Further alternatively, the electrically conductive part or parts of the nipple may be created by plating a metallic material on to the plastics material of the nipple. The essential integer is that at least a part of the nipple which is in contact with the holding means for holding the armouring of the cable and a part of the nipple which is in contact with the apparatus in use are formed of an electrically conductive material so that electrical continuity is maintained between the armouring of the cable and the apparatus in use.
The cable gland of the invention has the advantage that at least parts thereof are made of a plastics material which is non-corrosive in use and which reduces the quantity of metal required, thus reducing the cost.
Claims (18)
1.
A cable gland for attaching an armoured cable to an apparatus comprising a cable gland body which is internally or externally threaded and includes an externally threaded nipple for attaching the cable gland to the apparatus and is adapted to receive holding means for holding the armouring of the cable in use, a compression nut which is externally or internally threaded to co-operate with the internal or external thread respectively of the cable gland body to compress the holding means to hold the armouring of the cable in use, is characterised in that the cable gland body is formed of a plastics material and in that at least a part of the nipple in contact with the holding means and with the apparatus in use is formed of an electrically conductive material.
2.
A cable gland according to claim 1 wherein the whole of the nipple is formed of an electrically conductive material attached to the plastics material of the cable gland body.
3.
A cable gland according to claim 1 wherein the nipple is formed of a plastics material having one or more strips of an electrically conductive material attached to the plastics material, the one or more strips being in contact with the holding means and with the apparatus in use.
4.
A cable gland according to any one of claims 1 to 3 wherein the electrically conductive material is a metallic material.
5.
A cable gland according to claim 4 wherein the electrically conductive material is brass.
6.
A cable gland according to any one of claims 1 to 5 wherein the compression nut is formed of a plastics material.
7.
A cable gland according to any one of claims 1 to 6 wherein the compression nut includes a section remote from the cable gland body in use which is internally or externally threaded and the cable gland includes a back nut which is complementarily threaded to the section of the compression nut, and an annular seal so that when the back nut is screwed on to or in to the compression nut in use the annular seal is compressed on to the cable.
8.
A cable gland according to claim 7 wherein the back nut is formed of a plastics material.
9.
A cable gland according to any one of claims 1 to 8 which includes a lock nut for location on the nipple for attaching the cable gland to the apparatus, the lock nut being formed of a plastics material.
10.
A cable gland according to any one of claims 1 to 8 which includes a lock nut for location on the nipple for attaching the cable gland to the apparatus, the lock nut being formed of a plastics material having one or more strips of an electrically conductive material attached to the plastics material.
11.
A cable gland according to any one of claims 1 to 10 wherein the plastics material is a thermoplastic material.
12 A cable gland according to any one of claims 1 to 10 wherein the plastics material is a thermosetting plastics material.
13.
A cable gland according to any one of claims 1 to 10 wherein the plastics material is a polycarbonate.
14.
A cable gland according to any one of claims 1 to 10 wherein the plastics material is a reaction setting plastics material.
15.
A cable gland according to any one of claims 1 to 10 wherein the plastics material is a hard natural or synthetic rubber material.
16.
A cable gland according to any of claims 1 to 10 wherein the plastics material is a clear plastics material.
17.
A cable gland for attaching an armoured cable to an apparatus comprising a cable gland body which is internally or externally threaded and includes an externally threaded nipple for attaching the cable gland to the apparatus and is adapted to receive holding means for holding the armouring of the cable in use, a compression nut which is externally or internally threaded to co-operate with the internal or external thread respectively of the cable gland body to compress the holding means to hold the armouring of the cable in use, is characterised in that the compression nut is formed of a plastics material.
18.
A cable gland according to claim 1 substantially as herein described with reference to Figure 1 or Figures 2 and 3 or Figure 4 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA909729A ZA909729B (en) | 1990-12-04 | 1990-12-04 | Differentiated material cable gland |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9114721D0 GB9114721D0 (en) | 1991-08-28 |
| GB2250644A true GB2250644A (en) | 1992-06-10 |
| GB2250644B GB2250644B (en) | 1994-12-21 |
Family
ID=25580427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9114721A Expired - Fee Related GB2250644B (en) | 1990-12-04 | 1991-07-08 | Differentiated material cable gland |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2250644B (en) |
| ZA (1) | ZA909729B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2752899A1 (en) * | 1996-09-03 | 1998-03-06 | Sib | Sealing gland for entry of cable or conduit to control enclosure |
| EP1365494A2 (en) * | 2002-05-24 | 2003-11-26 | Siemens Aktiengesellschaft | Cable feedthrough for an electrical device |
| US20210296879A1 (en) * | 2018-11-28 | 2021-09-23 | Wiska Hoppmann Gmbh | Integrally produced cable gland |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB832589A (en) * | 1957-01-31 | 1960-04-13 | Franklin Lewis Richardson | Improvements in or relating to glands for sealing electric cables and the like |
| GB850683A (en) * | 1956-02-09 | 1960-10-05 | Johnson And Phillips Ltd | An improved gland for armoured electric cable |
| GB1382981A (en) * | 1970-12-31 | 1975-02-05 | British Engines Ltd | Glands |
| WO1984004428A2 (en) * | 1983-04-21 | 1984-11-08 | Smith Tech Dev H R | Coaxial cables and couplings therefor |
-
1990
- 1990-12-04 ZA ZA909729A patent/ZA909729B/en unknown
-
1991
- 1991-07-08 GB GB9114721A patent/GB2250644B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB850683A (en) * | 1956-02-09 | 1960-10-05 | Johnson And Phillips Ltd | An improved gland for armoured electric cable |
| GB832589A (en) * | 1957-01-31 | 1960-04-13 | Franklin Lewis Richardson | Improvements in or relating to glands for sealing electric cables and the like |
| GB1382981A (en) * | 1970-12-31 | 1975-02-05 | British Engines Ltd | Glands |
| WO1984004428A2 (en) * | 1983-04-21 | 1984-11-08 | Smith Tech Dev H R | Coaxial cables and couplings therefor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2752899A1 (en) * | 1996-09-03 | 1998-03-06 | Sib | Sealing gland for entry of cable or conduit to control enclosure |
| EP1365494A2 (en) * | 2002-05-24 | 2003-11-26 | Siemens Aktiengesellschaft | Cable feedthrough for an electrical device |
| EP1365494A3 (en) * | 2002-05-24 | 2004-12-15 | Siemens Aktiengesellschaft | Cable feedthrough for an electrical device |
| US20210296879A1 (en) * | 2018-11-28 | 2021-09-23 | Wiska Hoppmann Gmbh | Integrally produced cable gland |
| US11757274B2 (en) * | 2018-11-28 | 2023-09-12 | Wiska Hoppmann Gmbh | Method for producing a pre-assembled integrally produced cable gland |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2250644B (en) | 1994-12-21 |
| ZA909729B (en) | 1992-08-26 |
| GB9114721D0 (en) | 1991-08-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20040708 |