CA1179029A - Electric cable glands - Google Patents
Electric cable glandsInfo
- Publication number
- CA1179029A CA1179029A CA000403544A CA403544A CA1179029A CA 1179029 A CA1179029 A CA 1179029A CA 000403544 A CA000403544 A CA 000403544A CA 403544 A CA403544 A CA 403544A CA 1179029 A CA1179029 A CA 1179029A
- Authority
- CA
- Canada
- Prior art keywords
- gland
- tubular members
- cable
- members
- annular chamber
- 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
-
- 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
-
- 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
-
- 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
- H02G3/08—Distribution boxes; Connection or junction boxes
- H02G3/088—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings or inlets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49174—Assembling terminal to elongated conductor
- Y10T29/49176—Assembling terminal to elongated conductor with molding of electrically insulating material
Abstract
ABSTRACT
ELECTRIC CABLE GLANDS
In a cable gland comprising two tubular members each wider at one end than at the other and telescopically engageable at their respective wider ends to define an annular chamber around a cable end inserted through the telescoped members with means for urging the tubular members axially together after the chamber has been filled with an appropriate sealing compound, at least one resilient contact finger is in electrical continuity with one of the tubular members and projects inwardly in order to make effective contact with a corrugated sheath or other metallic layer of the cable. The contact finger(s) is/are thus effectively embedded in the sealing compound, and locked in position when it sets, so giving a secure contact as well as an effective fluid-tight seal.
ELECTRIC CABLE GLANDS
In a cable gland comprising two tubular members each wider at one end than at the other and telescopically engageable at their respective wider ends to define an annular chamber around a cable end inserted through the telescoped members with means for urging the tubular members axially together after the chamber has been filled with an appropriate sealing compound, at least one resilient contact finger is in electrical continuity with one of the tubular members and projects inwardly in order to make effective contact with a corrugated sheath or other metallic layer of the cable. The contact finger(s) is/are thus effectively embedded in the sealing compound, and locked in position when it sets, so giving a secure contact as well as an effective fluid-tight seal.
Description
~'7~
ELECTRIC CABLE GLANDS
This invention relates to glands (also called terminators) for terminating electric cables with metallic sheaths or other metallic covering layers.
It is normally a requirement in such glands to ensure "earth (or ground) continuity" by providing an electrical connection between the cable sheath (or other covering layer) and the body, or some othe.r accessible member, of the gland.
This presents difficulties, especially when the layer to be contacted is a corrugated sheath, as different manufacturers 10 use different corrugation profiles (and some annular and others helical ones), and even for a given cable the effective contact radius varies rapidly along the length of the cable (and in the case of helical corrugations around the circumference as well).
Contact-making devices comprising resilient contact fingers, usually backed up with rubber compression rings, have been tried but are not wholly satisfactory because movements under thermal and mechanical stresses are liable to result in insecure contacts, or even fracture of the fingers in some 20 cases.
In accordance with the present invention, a cable gland comprises two tubular members each wider at one end than at the other and telescopically engageable at their respective wider ends to define an annular chamber around a cable end inserted through the telescoped members, means for urging the tubular members axially -together to reduce the volume of the annular chamber, and at least one resilient contact finger in electrical continuity wi-th and projecting inwardly from one of the said tubular members, 3~¢-~
In putting -the invention into use, the annular chamber is filled with a hard-setting compound in a pasty or viscous condition, and the compound is pressurised by urging the tubular members together before it sets, in order to securely embed the contact finger(s) and lock it or them in position. The compound may also provide a fluid-tight, pressure-tight and/or flameproof seal.
To allow the gland to be released, if required, from ~he apparatus to which the cable is connected without 10 destroying the body of set compound, the tubular members are preferably urged together by outer members that enclose them and are screwed together either by a direct threaded engagement between them or with drawbolts or the like; when a flameproof gland is required, one of the outer members should fit one of the tubular members closely enough over a sufficient axial length to form a joint that satisfies flameproof requirements (a flame gap or flameproof path); -typical requiremen-ts for an unthreaded joint would be for a diametral clearance less than 0.3 mm and an axial length of at least 12.5 mm. Manufacturing ~0 tolerances in such cases can be eased by making the tubular member and outer member concerned self-centring, e.g. by providing them with mating conical surfaces.
Preferably there are a plurality of contact fingers distributed around the circumference of the gland; preferably they are all formed as inward projections from a common annular or nearly annular body, such as a split or solid tube or a ælit or solid annular disc of a suitable resilient metal, for example beryllium copper, phosphor-bronze, stainless steel or even mild steel. This body may be force-fitted in the relevant 30 tubular member or could be welded, rivetted or otherwise secured to it.
Prior to fitting on the cable, the finger(s) may extend either radially or obliquely, in the la-tter case preferably with the free end(s) nearer to the position that will be occupied by the apparatus to which -the cable is to be connected than the fixed end(s).
Although the glands of the invention are primarily intended for use with corrugated cable sheaths of aluminium, copper, steel, etc., they can be used effectively on cables that include a smooth metallic sheath, e.g. of lead, or lapped 10 tape armour of tinned steel etc.
The invention will be further described by way of example with reference to the accompanying drawings in which:-Figure 1 is a cross-section through one particular form of termination made with a gland in accordance with the invention; and Figures 2 to 4 are end views showing three particular sizes of tubular member fitted with a plurality of contact finger(s).
Referring first to Figure 1, this shows a flameproof 20 termination for a three-core electric cable with a corrugated metal sheath 1 and a protective over-sheath 2 of plastics material. In making this termination, a contact ring 3 is made by taking a short length from a phosphor bronze strip previously punched to form a number of fingers on one of its sides, rolling the cut length to form it into a tube and then bending each of the fingers 4 sharply so as to exceed the elastic limit and leave each finger projecting radially inwards; the circular form can be retained by a circlip, interlocking, welding, etc., if required. Figures 2 to 4 show 30 typical proportions for various sizes of contact ring, all formed from the same strip punched to secure suitable finger lengths (which need not be different for every size). The opposite side of the phosphor bronze strip may be flanged as shown at 5 to strengthen it. This contact ring is snap-fitted into an undercut recess in the inner surface of a first tubular member 6 which is wider a~ its right hand end than its left.
This tubular member 6 supports an outer seal assembly 7 consisting of an elastomeric sealing ring 8 with skid washers 9 and a gland nut 10 threaded on the tubular member 6. This assembly, together with an outer gland nut 11 (whose function 10 is to be explained later) is slipped over the prepared cable end and the gland nut 10 is tightened to compress the sealing ring 8 and so locate the tubular member 6 on the cable end.
A suitable quantity of a resinous sealing putty, such as that sold by the Applicants under the trade mark "Bicaseal", is now made up and filled into the open end of the tubular member 6, and into the crutch of the cable, to a diameter roughly equal to the diameter of the mouth of the tubular member 6.
A second tubular member 12, which is wider at its 20 left hand end than its right hand end, is now threaded over the ends of the conductors 13 and telescoped with the free end of the tubular member 6. Members 6 and 12 are then urged together using the outer gland nut 11 and an outer body member 14 which are screw threaded together. The body 14 may already be fitted in the apparatus to which a connection is to be made, or it could be fitted later, as detailed below. By urging the members 6 and 12 together, pressure is generated in the filling compound in the chamber 15, ensuring that the filling is void~
free and makes an effective seal as well as locking the finger 30 4 in position.
The tubular member 12 is self-centring in the body ~:~'7~3~
portion 14 through the action of conical con-tact surfaces at 16 and the length of the joint between them (which is in fact the full length of the body 14), is sufficient ~o ensure a join-t that meets flameproof requirements.
~ hen the resin is set, it adheres firmly to -the tubular members 6 and 12, but the outer members 11 and 14 are not in contact with the resin and can be unscrewed as required.
If the body member is not already fixed in position in the apparatus, the outer gland nut 11 can be unscr~wed to allow the 10 body member 14 to be rotated for screwing it into the wall of the apparatus, and the gland then re-assembled. This process can be repeated, without detriment to the seal, if it is necessary to replace the whole or any relevant part of the apparatus.
ELECTRIC CABLE GLANDS
This invention relates to glands (also called terminators) for terminating electric cables with metallic sheaths or other metallic covering layers.
It is normally a requirement in such glands to ensure "earth (or ground) continuity" by providing an electrical connection between the cable sheath (or other covering layer) and the body, or some othe.r accessible member, of the gland.
This presents difficulties, especially when the layer to be contacted is a corrugated sheath, as different manufacturers 10 use different corrugation profiles (and some annular and others helical ones), and even for a given cable the effective contact radius varies rapidly along the length of the cable (and in the case of helical corrugations around the circumference as well).
Contact-making devices comprising resilient contact fingers, usually backed up with rubber compression rings, have been tried but are not wholly satisfactory because movements under thermal and mechanical stresses are liable to result in insecure contacts, or even fracture of the fingers in some 20 cases.
In accordance with the present invention, a cable gland comprises two tubular members each wider at one end than at the other and telescopically engageable at their respective wider ends to define an annular chamber around a cable end inserted through the telescoped members, means for urging the tubular members axially -together to reduce the volume of the annular chamber, and at least one resilient contact finger in electrical continuity wi-th and projecting inwardly from one of the said tubular members, 3~¢-~
In putting -the invention into use, the annular chamber is filled with a hard-setting compound in a pasty or viscous condition, and the compound is pressurised by urging the tubular members together before it sets, in order to securely embed the contact finger(s) and lock it or them in position. The compound may also provide a fluid-tight, pressure-tight and/or flameproof seal.
To allow the gland to be released, if required, from ~he apparatus to which the cable is connected without 10 destroying the body of set compound, the tubular members are preferably urged together by outer members that enclose them and are screwed together either by a direct threaded engagement between them or with drawbolts or the like; when a flameproof gland is required, one of the outer members should fit one of the tubular members closely enough over a sufficient axial length to form a joint that satisfies flameproof requirements (a flame gap or flameproof path); -typical requiremen-ts for an unthreaded joint would be for a diametral clearance less than 0.3 mm and an axial length of at least 12.5 mm. Manufacturing ~0 tolerances in such cases can be eased by making the tubular member and outer member concerned self-centring, e.g. by providing them with mating conical surfaces.
Preferably there are a plurality of contact fingers distributed around the circumference of the gland; preferably they are all formed as inward projections from a common annular or nearly annular body, such as a split or solid tube or a ælit or solid annular disc of a suitable resilient metal, for example beryllium copper, phosphor-bronze, stainless steel or even mild steel. This body may be force-fitted in the relevant 30 tubular member or could be welded, rivetted or otherwise secured to it.
Prior to fitting on the cable, the finger(s) may extend either radially or obliquely, in the la-tter case preferably with the free end(s) nearer to the position that will be occupied by the apparatus to which -the cable is to be connected than the fixed end(s).
Although the glands of the invention are primarily intended for use with corrugated cable sheaths of aluminium, copper, steel, etc., they can be used effectively on cables that include a smooth metallic sheath, e.g. of lead, or lapped 10 tape armour of tinned steel etc.
The invention will be further described by way of example with reference to the accompanying drawings in which:-Figure 1 is a cross-section through one particular form of termination made with a gland in accordance with the invention; and Figures 2 to 4 are end views showing three particular sizes of tubular member fitted with a plurality of contact finger(s).
Referring first to Figure 1, this shows a flameproof 20 termination for a three-core electric cable with a corrugated metal sheath 1 and a protective over-sheath 2 of plastics material. In making this termination, a contact ring 3 is made by taking a short length from a phosphor bronze strip previously punched to form a number of fingers on one of its sides, rolling the cut length to form it into a tube and then bending each of the fingers 4 sharply so as to exceed the elastic limit and leave each finger projecting radially inwards; the circular form can be retained by a circlip, interlocking, welding, etc., if required. Figures 2 to 4 show 30 typical proportions for various sizes of contact ring, all formed from the same strip punched to secure suitable finger lengths (which need not be different for every size). The opposite side of the phosphor bronze strip may be flanged as shown at 5 to strengthen it. This contact ring is snap-fitted into an undercut recess in the inner surface of a first tubular member 6 which is wider a~ its right hand end than its left.
This tubular member 6 supports an outer seal assembly 7 consisting of an elastomeric sealing ring 8 with skid washers 9 and a gland nut 10 threaded on the tubular member 6. This assembly, together with an outer gland nut 11 (whose function 10 is to be explained later) is slipped over the prepared cable end and the gland nut 10 is tightened to compress the sealing ring 8 and so locate the tubular member 6 on the cable end.
A suitable quantity of a resinous sealing putty, such as that sold by the Applicants under the trade mark "Bicaseal", is now made up and filled into the open end of the tubular member 6, and into the crutch of the cable, to a diameter roughly equal to the diameter of the mouth of the tubular member 6.
A second tubular member 12, which is wider at its 20 left hand end than its right hand end, is now threaded over the ends of the conductors 13 and telescoped with the free end of the tubular member 6. Members 6 and 12 are then urged together using the outer gland nut 11 and an outer body member 14 which are screw threaded together. The body 14 may already be fitted in the apparatus to which a connection is to be made, or it could be fitted later, as detailed below. By urging the members 6 and 12 together, pressure is generated in the filling compound in the chamber 15, ensuring that the filling is void~
free and makes an effective seal as well as locking the finger 30 4 in position.
The tubular member 12 is self-centring in the body ~:~'7~3~
portion 14 through the action of conical con-tact surfaces at 16 and the length of the joint between them (which is in fact the full length of the body 14), is sufficient ~o ensure a join-t that meets flameproof requirements.
~ hen the resin is set, it adheres firmly to -the tubular members 6 and 12, but the outer members 11 and 14 are not in contact with the resin and can be unscrewed as required.
If the body member is not already fixed in position in the apparatus, the outer gland nut 11 can be unscr~wed to allow the 10 body member 14 to be rotated for screwing it into the wall of the apparatus, and the gland then re-assembled. This process can be repeated, without detriment to the seal, if it is necessary to replace the whole or any relevant part of the apparatus.
Claims (8)
1. A cable gland comprising two tubular members each wider at one end than at the other end and telescopically engageable at their respective wider ends to define an annular chamber around a cable end inserted through the telescoped members, means for urging the tubular members axially together to reduce the volume of the annular chamber and at least one resilient contact finger in electrical continuity with and projecting inwardly from of the said tubular members.
2. A gland as claimed in Claim 1 in which the tubular members are urged together by outer members that enclose them and are screwed together.
3. A gland as claimed in Claim 2 in which one of the outer members fits one of the tubular members closely enough over a sufficient axial length to form a joint that satisfies flameproof requirements.
4. A gland as claimed in Claim 1 or Claim 2 or Claim 3 in which there are a plurality of contact fingers distributed around the circumference of the gland.
5. A gland as claimed in Claim 1 or Claim 2 or Claim 3 in which there are a plurality of contact fingers distributed around the circumference of the gland and formed as inward projections from a common annular or nearly annular body.
6. A method of making a termination comprising providing a cable gland comprising two tubular members each wider at one end than at the other end and telescopically engageable at their respective wider ends to define an annular chamber around a cable end inserted through the telescoped members, means for urging the tubular members axially together to reduce the volume of the annular chamber and at least one resilient contact finger in electrical continuity with and projecting inwardly from of the said tubular members, filling the annular chamber with a hard setting sealing compound in a pasty or viscous condition and pressurising the compound by urging the tubular members together before it sets in order to securely embed the contact finger(s) and lock it or them in position.
7. A electrical cable termination made with the gland claimed in Claim 1 or Claim 2 or Claim 3.
8. An electrical cable termination made by the method claimed in Claim 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8211669 | 1982-04-22 | ||
| GB8211669 | 1982-04-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1179029A true CA1179029A (en) | 1984-12-04 |
Family
ID=10529863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000403544A Expired CA1179029A (en) | 1982-04-22 | 1982-05-21 | Electric cable glands |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4515991A (en) |
| EP (1) | EP0093524B1 (en) |
| JP (1) | JPS58192421A (en) |
| AT (1) | ATE37969T1 (en) |
| CA (1) | CA1179029A (en) |
| DE (1) | DE3378242D1 (en) |
| HK (1) | HK118993A (en) |
| MY (1) | MY100303A (en) |
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|---|---|---|---|---|
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| EP3787123A1 (en) | 2019-08-28 | 2021-03-03 | Etel S. A.. | Cable shield connecting assembly for electrical device and method for securing and grounding a cable to a cylindrical housing of an electric rotary motor |
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| US4015329A (en) * | 1974-12-20 | 1977-04-05 | John Blundell Hutchison | Termination of electric cables |
| GB1524683A (en) * | 1974-12-20 | 1978-09-13 | Bicc Ltd | Termination of electric cables |
| GB1524684A (en) * | 1975-12-22 | 1978-09-13 | Bicc Ltd | Termination of electric cables |
| US4022966A (en) * | 1976-06-16 | 1977-05-10 | I-T-E Imperial Corporation Efcor Division | Ground connector |
| GB1603499A (en) * | 1978-05-19 | 1981-11-25 | British Eng Ltd | Cable glands |
| GB2056191A (en) * | 1979-06-15 | 1981-03-11 | British Engines Ltd | Improvements in, or relating to, cable seals |
| US4273405A (en) * | 1979-08-13 | 1981-06-16 | Thomas & Betts Corporation | Jacketed metal clad cable connector |
-
1982
- 1982-05-21 CA CA000403544A patent/CA1179029A/en not_active Expired
-
1983
- 1983-04-05 US US06/482,144 patent/US4515991A/en not_active Expired - Lifetime
- 1983-04-14 DE DE8383302094T patent/DE3378242D1/en not_active Expired
- 1983-04-14 EP EP83302094A patent/EP0093524B1/en not_active Expired
- 1983-04-14 AT AT83302094T patent/ATE37969T1/en not_active IP Right Cessation
- 1983-04-20 JP JP58068467A patent/JPS58192421A/en active Granted
-
1986
- 1986-11-27 MY MYPI86000149A patent/MY100303A/en unknown
-
1993
- 1993-11-04 HK HK1189/93A patent/HK118993A/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8657626B2 (en) | 2010-12-02 | 2014-02-25 | Thomas & Betts International, Inc. | Cable connector with retaining element |
| EP3787123A1 (en) | 2019-08-28 | 2021-03-03 | Etel S. A.. | Cable shield connecting assembly for electrical device and method for securing and grounding a cable to a cylindrical housing of an electric rotary motor |
| US11283198B2 (en) | 2019-08-28 | 2022-03-22 | Etel S.A. | Cable shield connecting assembly for electrical device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0410294B2 (en) | 1992-02-24 |
| JPS58192421A (en) | 1983-11-09 |
| HK118993A (en) | 1993-11-12 |
| EP0093524A2 (en) | 1983-11-09 |
| ATE37969T1 (en) | 1988-10-15 |
| EP0093524B1 (en) | 1988-10-12 |
| DE3378242D1 (en) | 1988-11-17 |
| EP0093524A3 (en) | 1986-03-19 |
| US4515991A (en) | 1985-05-07 |
| MY100303A (en) | 1990-08-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |