WO1990001225A1 - Arrangements for grounding screened cables - Google Patents

Arrangements for grounding screened cables Download PDF

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Publication number
WO1990001225A1
WO1990001225A1 PCT/GB1989/000847 GB8900847W WO9001225A1 WO 1990001225 A1 WO1990001225 A1 WO 1990001225A1 GB 8900847 W GB8900847 W GB 8900847W WO 9001225 A1 WO9001225 A1 WO 9001225A1
Authority
WO
WIPO (PCT)
Prior art keywords
cables
screens
spring
spring element
bundle
Prior art date
Application number
PCT/GB1989/000847
Other languages
French (fr)
Inventor
Nicholas Henry Neely
Michael William Robertson
Original Assignee
Bowthorpe-Hellermann Limited
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 Bowthorpe-Hellermann Limited filed Critical Bowthorpe-Hellermann Limited
Publication of WO1990001225A1 publication Critical patent/WO1990001225A1/en

Links

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
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  

Definitions

  • This invention relates to arrangements for grounding or earthing the screens of electrical cables.
  • a method of grounding the screens of a bundle of individuallyscreened cables comprising locally baring the screens of the cables, and then wrapping a spring element around the cables so as to make contact with the bared screens.
  • the spring element is a so-called constant force spring, which comprises a strip of spring metal wrapped into a coil of several turns. This can be wrapped easily by hand around the bundle of cables and exerts a force radially on the cables, which force is constant over a range of diameters of the bundle of cables.
  • an assembly of individually screened and collectively grounded cables comprising a bundle of individually screened cables having their screens locally bared and a spring element wrapped around the cables in contact with the bared screens.
  • a kit for collectively grounding the screens of a bundle of individually-screened cables comprising a spring element for wrapping around the cables to make contact with locally bared regions of the screens of the cables, and means for connecting the spring element to ground.
  • the means for connecting the spring element to ground may comprise any of the means mentioned above for continuing a cable screen to a connector to which the cable is connected.
  • FIGURE 1 is a perspective view of a constant force spring used in accordance with this invention for collectively grounding the screens of a bundle of individually-screened cables;
  • FIGURE 2 is a side view of a bundle of cables to which a constant force spring has been applied.
  • FIGURE 3 is a view of the bundle of cables provided with a connector to which the constant force spring is electrically connected by a screened heat-shrink shape.
  • a constant force spring 10 which comprises a strip of spring steel which has been wrapped around a former to form a coil of several contiguous turns. This spring can be wrapped
  • each cable has its own screen and its outer insulation is stripped over a local window to bare the screen 22. All cables are similarly stripped at the same position along the length of the bundle.
  • the constant force spring 10 is wrapped around the bundle of cables so as to make contact with the screens of the outer cables and so as to press together the screens of adjacent cables of the bundle.
  • the spring 10 can be applied and removed without deterioration of performance many times, so that it can be readily removed for carrying out repairs.
  • the spring ensures a low contact resistance of approximately one milli ohm between adjacent cable screens and between itself and the screens which it contacts.
  • the wires of individually screened cables are often very fine, e.g. with diameters less than 0.15 mm. As the edge of the spring is often sharp, there is a possibility that it may cut such fine wires. Therefore, as protection, a piece of braid or other conductive material may be wrapped around the bundle of cables between the bared screens and the spring. If braid is used, its wires should be of greater diameter than the cable wires, and therefore e.g. greater than 0.2 mm diameter.
  • the cable bundle is typically connected to a connector 30 and the screens, collectively connected by the spring 10, are connected to the connector 30 by a heat-shrink tubular shape 40 which is provided with an electrically conductive screen on its inner surface.

Landscapes

  • Insulated Conductors (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Abstract

The screens of a bundle of cables are grounded by locally baring the screens of the cables and then wrapping a constant-force spring (10) around them so as to make contact with the bared screens and press together the screens of the adjacent cables. The spring (10) may then be connected to a connector to which the cables are connected.

Description

ARRANGEMENTS FOR GROUNDING SCREENED CABLES
This invention relates to arrangements for grounding or earthing the screens of electrical cables.
There are currently a number of different ways of continuing or transferring the screening of a cable onto a connector. These include the use of connectors with braid tails, reverse cone clamps, iris springs and screened
moulded heat-shrink tubular shapes.
There is now an increasing use of individually screened pairs, triplex and quads. The use of such cables leads to difficulties in providing continuity of their screens at their connectors.
We have now devised an arrangement for collectively grounding the screens of a bundle of individually-screened cables.
In accordance with this invention, there is provided a method of grounding the screens of a bundle of individuallyscreened cables, comprising locally baring the screens of the cables, and then wrapping a spring element around the cables so as to make contact with the bared screens.
Preferably the spring element is a so-called constant force spring, which comprises a strip of spring metal wrapped into a coil of several turns. This can be wrapped easily by hand around the bundle of cables and exerts a force radially on the cables, which force is constant over a range of diameters of the bundle of cables. Also in accordance with this invention, there is provided an assembly of individually screened and collectively grounded cables, comprising a bundle of individually screened cables having their screens locally bared and a spring element wrapped around the cables in contact with the bared screens.
Further in accordance with this invention, there is provided a kit for collectively grounding the screens of a bundle of individually-screened cables, comprising a spring element for wrapping around the cables to make contact with locally bared regions of the screens of the cables, and means for connecting the spring element to ground.
The means for connecting the spring element to ground may comprise any of the means mentioned above for continuing a cable screen to a connector to which the cable is connected.
An embodiment of this invention will now be described by way of example only and with reference to the accompanying drawings, in which:
FIGURE 1 is a perspective view of a constant force spring used in accordance with this invention for collectively grounding the screens of a bundle of individually-screened cables;
FIGURE 2 is a side view of a bundle of cables to which a constant force spring has been applied; and
FIGURE 3 is a view of the bundle of cables provided with a connector to which the constant force spring is electrically connected by a screened heat-shrink shape.
Referring to Figure 1 , there is shown a constant force spring 10 which comprises a strip of spring steel which has been wrapped around a former to form a coil of several contiguous turns. This spring can be wrapped
easily by hand around a bundle of cables of diameter
between 1.1 and 1.8 times the internal diameter of the coiled spring. Over this range, the spring exerts a substantially constant radial force on the bundle of cables around which it is wrapped. Referring to Figure 2, there is shown a bundle of cables 20. Each cable has its own screen and its outer insulation is stripped over a local window to bare the screen 22. All cables are similarly stripped at the same position along the length of the bundle. The constant force spring 10 is wrapped around the bundle of cables so as to make contact with the screens of the outer cables and so as to press together the screens of adjacent cables of the bundle.
The spring 10 can be applied and removed without deterioration of performance many times, so that it can be readily removed for carrying out repairs. The spring ensures a low contact resistance of approximately one milli ohm between adjacent cable screens and between itself and the screens which it contacts.
The wires of individually screened cables are often very fine, e.g. with diameters less than 0.15 mm. As the edge of the spring is often sharp, there is a possibility that it may cut such fine wires. Therefore, as protection, a piece of braid or other conductive material may be wrapped around the bundle of cables between the bared screens and the spring. If braid is used, its wires should be of greater diameter than the cable wires, and therefore e.g. greater than 0.2 mm diameter.
Referring to Figure 3. the cable bundle is typically connected to a connector 30 and the screens, collectively connected by the spring 10, are connected to the connector 30 by a heat-shrink tubular shape 40 which is provided with an electrically conductive screen on its inner surface.

Claims

1) A method of grounding the screens of a bundle of individually screened cables, comprising locally baring the screens of the cables, and then wrapping a spring element around the cables so as to make contact with the bared screens and press together the screens of adjacent cables of the bundle.
2) A method as claimed in claim 1, in which the spring element is a constant-force spring which comprises a strip of spring metal wrapped into a coil of several turns.
3) A method as claimed in claim 1 or 2, further comprising the step of forming an electrical connection between the spring element and a connector to which the individual cables are connected.
4) An assembly of individually screened and collectively grounded cables comprising a bundle of individually screened cables having their screens locally bared and a spring element wrapped around the cables in contact with the bared screens and pressing together the screens of adjacent cables of the bundle.
5) An assembly as claimed in claim 4, in which the spring element is a constant-force spring which comprises a strip of spring metal wrapped into a coil of several turns.
6) An assembly as claimed in claim 4 or 5, further comprising means electrically connecting the spring element to a connector to which the individual cables are connected. 7) A kit for collectively grounding the screens of a bundle of individually screened cables, comprising a spring element for wrapping around the cables to make contact with locally bared regions of the screens of the cables, and means for connecting the spring element to ground.
8) A kit as claimed in claim 7, in which the spring element is a constant-force spring which comprises a strip of spring metal wrapped into a coil of several turns.
9) a kit as claimed in claim 7 or 8, in which the connecting means comprises means for connecting the spring element to a connector to which the individual cables are connected.
PCT/GB1989/000847 1988-07-28 1989-07-26 Arrangements for grounding screened cables WO1990001225A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8818037.7 1988-07-28
GB8818037A GB2221355A (en) 1988-07-28 1988-07-28 Grounding screened cables

Publications (1)

Publication Number Publication Date
WO1990001225A1 true WO1990001225A1 (en) 1990-02-08

Family

ID=10641281

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1989/000847 WO1990001225A1 (en) 1988-07-28 1989-07-26 Arrangements for grounding screened cables

Country Status (3)

Country Link
GB (1) GB2221355A (en)
IL (1) IL90916A0 (en)
WO (1) WO1990001225A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0687037A1 (en) * 1994-06-09 1995-12-13 Fokker Aircraft B.V. Shielding arrangement between several shielding cables and a connector
US8535085B1 (en) 2012-04-12 2013-09-17 Event Horizon, L.L.C. Electrical connector backshell adaptor assembly
US10224668B2 (en) 2017-10-20 2019-03-05 Isodyne, Inc. Assembly for terminating an EMF shielded cable harness at an electrical component port

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2613293B2 (en) * 1989-04-25 1997-05-21 北川工業 株式会社 Clamp
GB2254196A (en) * 1991-03-20 1992-09-30 Michael Ian Hubbard Earthing device.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3311780A1 (en) * 1983-03-31 1984-10-04 kabelmetal electro GmbH, 3000 Hannover Electrically conductive connection for power cables having a coating sheath
US4494520A (en) * 1983-01-19 1985-01-22 Magnum Shielding Corp. Sheathing system for automotive or marine ignition wires
DE3439931A1 (en) * 1984-11-02 1986-05-15 Robert 5223 Nümbrecht Heister Screened plug connector (II)
GB2199198A (en) * 1986-11-29 1988-06-29 Kern Electrical Components Lim Backshell for screened multicore cable connectors

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417437A (en) * 1966-06-24 1968-12-24 Emhart Corp Spring wire hose clamp and form post for making said clamp
GB1474901A (en) * 1973-08-29 1977-05-25 United Carr Ltd Fastener
GB2087468A (en) * 1980-11-06 1982-05-26 Aoki Takaaki Clamp for Hoses and the Like
GB8604089D0 (en) * 1986-02-19 1986-03-26 Bowthorpe Hellermann Ltd Heat-shrinkable article
GB8619398D0 (en) * 1986-08-08 1986-09-17 Raychem Ltd Dimensionally recoverable article
GB8717214D0 (en) * 1987-07-21 1987-08-26 Staeng Ltd Adaptors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4494520A (en) * 1983-01-19 1985-01-22 Magnum Shielding Corp. Sheathing system for automotive or marine ignition wires
DE3311780A1 (en) * 1983-03-31 1984-10-04 kabelmetal electro GmbH, 3000 Hannover Electrically conductive connection for power cables having a coating sheath
DE3439931A1 (en) * 1984-11-02 1986-05-15 Robert 5223 Nümbrecht Heister Screened plug connector (II)
GB2199198A (en) * 1986-11-29 1988-06-29 Kern Electrical Components Lim Backshell for screened multicore cable connectors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0687037A1 (en) * 1994-06-09 1995-12-13 Fokker Aircraft B.V. Shielding arrangement between several shielding cables and a connector
US8535085B1 (en) 2012-04-12 2013-09-17 Event Horizon, L.L.C. Electrical connector backshell adaptor assembly
US10224668B2 (en) 2017-10-20 2019-03-05 Isodyne, Inc. Assembly for terminating an EMF shielded cable harness at an electrical component port

Also Published As

Publication number Publication date
GB2221355A (en) 1990-01-31
GB8818037D0 (en) 1988-09-01
IL90916A0 (en) 1990-02-09

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