GB2427080A - An electrical harness screen trap transition - Google Patents

An electrical harness screen trap transition Download PDF

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Publication number
GB2427080A
GB2427080A GB0511714A GB0511714A GB2427080A GB 2427080 A GB2427080 A GB 2427080A GB 0511714 A GB0511714 A GB 0511714A GB 0511714 A GB0511714 A GB 0511714A GB 2427080 A GB2427080 A GB 2427080A
Authority
GB
United Kingdom
Prior art keywords
transition
screen trap
screen
trap
thread
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
GB0511714A
Other versions
GB0511714D0 (en
GB2427080B (en
Inventor
Derek Andrews
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.)
TT Electronics Fairford Ltd
Original Assignee
New Chapel Electronics Ltd
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 New Chapel Electronics Ltd filed Critical New Chapel Electronics Ltd
Priority to GB0511714A priority Critical patent/GB2427080B/en
Publication of GB0511714D0 publication Critical patent/GB0511714D0/en
Publication of GB2427080A publication Critical patent/GB2427080A/en
Application granted granted Critical
Publication of GB2427080B publication Critical patent/GB2427080B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
    • H02G3/0462—Tubings, i.e. having a closed section
    • H02G3/0481—Tubings, i.e. having a closed section with a circular cross-section
    • 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  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6591—Specific features or arrangements of connection of shield to conductive members
    • H01R13/65912—Specific features or arrangements of connection of shield to conductive members for shielded multiconductor cable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
    • H01R4/646—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for cables or flexible cylindrical bodies
    • 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
    • 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

Abstract

A screen trap 14 for an electrical harness transition 10, the screen trap comprising a screen trap body 24 having a though-bore 26; means 28,38 at a first end 30 of the body for engaging electrical screening material; and means 34 at a second end 36 of the screen trap body 24, opposite the first end 30, for screw-threadably engaging the screen trap body 24 with an electrical harness transition body 12. The transition engaging means including an internal screw-thread 34 for screw-threaded engagement with a mating external screw-thread 22 formed on the transition body 12. An electrical harness transition 10 for a screened electrical cable assembly is also provided, the transition 10 including the screen trap 14.

Description

improvements in and relating to an electrical harness This invention
relates to an electrical harness transition and to a screen trap for such a transition, particularly hut not exclusively for vehicles, such as aeroplanes.
One part and two part electrical harness transitions are well known. A screen trap typically has an external thread at one end to allow engagement with a mating thread formed internally on the one-part hollow body transition. However, in the case of a two part transition, the threaded screen trap is dispensed with and a former is located within the screening material, which is then located in an opening of the two part transition. The two part transition is then clamped together using a bandit clamp. The former prevents the clamp from deforming the transition and the screening material.
This type of clamping is problematic, since it is sometimes difficult to apply, especially in confined places, and removal requires severing. Furthermore, depending upon whether a one part or two part transition is used, different fixings or devices have to be selected and obtained, such as screen traps or formers and clamps. Screw together type systems also require a range of additional parts, such as screws. These parts are easily misplaced and lost.
Other problems also occur, such as when using conduit. In this case, a further modified screen trap is then required to also enable engagement with the conduit.
The present invention seeks to provide a solution to these problems.
According to a first aspect of the invention, there is provided a screen trap for an electrical harness transition, the screen trap comprising a screen trap body having a though-bore; means at a first end of the body for engaging electrical screening material; and means at a second end of the screen trap body, opposite the first end, for screw- threadably engaging the body with an electrical harness transition, the transition engaging means including an internal screw-thread for screw- threaded engagement with a mating external screw-thread formed on the transition.
Preferable and/or optional features of the first aspect of the invention are set forth in claims 2 to 9, inclusive.
According to a second aspect of the invention, there is provided an electrical harness transition for a screened electrical cable assembly, the transition comprising a transition body having a main through-bore, a branch bore communicating with the main through-bore, and an external screw-thread formed at at least one end of the transition body; and a screen trap in accordance with the first aspect of the invention, the screen trap being engagable with the transition body via the internal screw-thread of the transition engaging means of the screen trap and the external screw-thread of the transition body.
Preferable and/or optional features of the second aspect of the invention are set forth in claims 12 to 16, inclusive.
The present invention will now be more particularly described, by way of example only, with reference to the accompanying drawings, in which Figure 1 shows an assembled two part electrical harness transition, in accordance with the second aspect of the invention and including a screen trap according to the first aspect of the invention; Figure 2 shows an exploded view of the two part transition, shown in Figure 1; and Figure 3 is a different perspective view of a screen trap, in accordance with the first aspect of the invention.
Referring now to the drawings, there is shown an electrical harness transition 10 for a screened electrical cable assembly. The transition 10 comprises a two-part Y- shaped transition body 12 and a screen trap 14. The two parts of the transition body 12 include matching or substantially matching forked channels 16 which, when mated, define a main through-bore 18 and a branch bore 20. The branch bore 20 is open at one end and communicates with the main through-bore 18 at the other end.
A screw thread 22 is formed on an exterior surface of the transition body 12.
The screen trap 14 comprises a screen trap body 24 having a through-bore 26, a first screw-thread 28 formed on an exterior surface at a first end 30 of the trap body 24, a second screw-thread 32 formed internally on the surface of the bore 26, also at the first end 30 of the trap body 24, a third screw-thread 34 formed internally on the surface of the bore 26 at a second end 36 of the trap body 24, which is opposite the first end 30, and a screen trap nut 38.
The first screw-thread 28 on the trap body 24 and the screen trap nut 38 together form means for engaging commonly available, typically braided, electrical screening material (not shown). The minor diameter of the first screw-thread 28 on the trap body 24 is sufficiently less than the major diameter of an internal thread of the screen trap nut 38, so as to allow the screening material to be initially wound or pushed onto the first screw-thread 28 and then trapped in place by mating screw- threaded engagement of the screen trap nut 38.
The second screw-thread 32 on the trap body 24 forms means for engaging a 1 5 conduit (not shown). In this case, the conduit includes a helical rib or screw-thread formed on an exterior surface, thereby allowing the conduit to be wound into engagement with the second screw-thread 32 of the trap body 24. The electrical screening material will thus sheath the conduit.
The third screw-thread 34 on the trap body 24 is engagable with the exterior screw thread 22 on the transition body 12, and thus forms means for engaging the trap body 24 with the transition body 12. This transition engaging means also clamps the two parts of the transition body 12 together. The two parts of the transition body 12 are thus held together solely by the transition engaging means of the screen trap 14 engaging with the exterior screw thread 22 of the transition body 12.
Other transition engaging means could also be provided, such as the third screw- thread 34 being formed internally on a nut which is angularly displaceable relative to the screen trap body 24. This nut would then connect the screen trap body 24 to the transition body 12 by engaging with the screw thread 22 formed on the transition body 12.
The electrical harness transition 10, which includes the transition body 12 and the screen trap 14, is formed from material which can maintain electrical continuity. For example, the transition 10 is formed from moulded plastics material which can be plated with electrically conductive material.
In use, the electrical screening material and conduit are threaded onto cable to be housed in an electrical harness, the screen trap 14 is also threaded onto the cable. The two part transition body 12 is assembled around the cable, and the or each screen trap 14 is screw threadingly engaged by hand with the transition body 12 to clamp the transition body 12 together. The screening material and conduit are then connected to the screen trap body 24, as described above.
To open the transition body 12, for example, for repair or maintenance purposes, the or each screen trap body 24 is simply unwound by hand and released from the transition body 12.
The transition body can be a single one part hollow body, instead of two part. In this case, the transition engaging means of the screen trap simply engages the screen trap body with the transition body without clamping the transition body together.
Additionally, the transition body could feasibly have more than two parts, clamped by screen traps.
Furthermore, the transition body may be any other suitable shape, such as T shaped.
Any other suitable means for engaging electrical screening material could be utilised.
Other means for engaging a conduit with the screen trap body can also be 1 5 considered. For example, instead of an internal second screw-thread, one or more independent annular ribs can be provided. In this case, spaced circumferential ribs are formed on the exterior of the conduit, and the conduit is simply pushed into the screen trap body whereby opposing ribs ride over each other to form engagement between the trap body and the conduit. Again, the electrical screening material sheaths the conduit.
To provide for the case where the conduit sheaths the screening material, the conduit engaging means is formed on the exterior of the screen trap body.
In the case when the conduit sheaths the screening material, the conduit engaging means can alternatively be provided on the screen trap nut. In this case, the screen trap nut is formed internally with the second screwthread or the or each annular rib. When the screen trap nut is engaged with the first screw-thread on the trap body, the conduit is held in place.
It is thus possible to provide a screen trap which can be used with either a one part or multiple part transition body. In the case of a multiple part transition, the screen trap also clamps the transition together. The screen trap is also easily removed by hand without having to cut or remove other discrete clamping devices. An electrical harness transition can also be provided which is simple to assemble and which includes a universal screen trap regardless as to whether the transition body is one part or multi- part.
The embodiments described above are given by way of examples only, and other modifications will he apparent to persons skilled in the art without departing from the scope of the invention, as defined by the appended claims.

Claims (17)

  1. Claims I A screen trap for an electrical harness transition, the screen
    trap comprising a screen trap body having a though-hore means at a first end of the body for engaging electrical screening materiaI and means at a second end of the screen trap body, opposite the first end, for screwthreadably engaging the body with an electrical harness transition, the transition engaging means including an internal screw-thread for screw-threaded engagement with a mating external screw- thread formed on the transition.
  2. 2. A screen trap as claimed in claim 1, wherein the internal screw-thread of the transition engaging means is integrally formed in a surface of the bore of the screen trap body, at the second end of the screen trap body.
  3. 3. A screen trap as claimed in claim I, wherein the transition engaging means is in the form of an internally threaded nut which is angularly displaceable relative to 1 5 the screen trap body and which can screw-threadably engage the screen trap with the transition.
  4. 4. A screen trap as claimed in any one of the preceding claims, wherein the screening material engaging means includes an external screw-thread formed on the body for threadably engaging the screen material.
  5. 5. A screen trap as claimed in claim 4, wherein the screening material engaging means includes a screen trap nut having an internal screw-thread for mating screw-threaded engagement with the external screw-thread formed on the screen trap body.
  6. 6. A screen trap as claimed in any one of the preceding claims, further comprising means for engaging a conduit with the screen trap body, so that the conduit extends coaxially or substantially coaxially with the screening material.
  7. 7. A screen trap as claimed in claim 6, wherein the conduit engaging means is in the form of one or more independent ribs, or a screw-thread, integrally formed in a surface of the bore of the screen trap body, at or adjacent to the first end of the screen trap body.
  8. 8. A screen trap as claimed in claim 6, when dependent on claim 5, wherein the conduit engaging means is in the form of one or more independent ribs, or a screw-thread, integrally formed on the screen trap body.
  9. 9. A screen trap as claimed in any one of the preceding claims, wherein the screen trap is formed at least in part of material which can be plated with electrically conductive material.
  10. 10. A screen trap substantially as hereinbefore described with reference to the accompanying drawings.
  11. Ii. An electrical harness transition for a screened electrical cable assembly, the transition comprising a transition body having a main through-bore, a branch bore communicating with the main through-bore, and an external screw-thread formed at at least one end of the transition body; and a screen trap as claimed in any one of the preceding claims, the screen trap being engagable with the transition body via the internal screw-thread of the transition engaging means of the screen trap and the external screw-thread of the transition body.
  12. 12. An electrical harness as claimed in claim 11, wherein a said external screw- thread is formed at each end of the transition body.
  13. 13. An electrical harness transition as claimed in claim 11 or claim 12, wherein the transition body includes two parts which can be clamped together by the or each screen trap.
  14. 14. An electrical harness transition as claimed in claim 13, wherein interior channels of the two parts oCthe transition body match or substantially match so that, when the two parts arc assembled together, the main through-bore and the branch bore are formed.
  15. 15. An electrical harness transition as claimed in claim 13 or claim 14, wherein the transition engaging means of the or each screen trap clamps the two parts of the transition body together.
  16. 1 6 An electrical harness transition as claimed in any one of claims 13 to I 5, wherein the two parts of the transition body are held together solely by the or each screen trap.
  17. 17. An electrical harness transition substantially as hereinbefore described with reference to the accompanying drawings.
GB0511714A 2005-06-09 2005-06-09 Improvements in and relating to an electrical harness screen trap transition Expired - Fee Related GB2427080B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0511714A GB2427080B (en) 2005-06-09 2005-06-09 Improvements in and relating to an electrical harness screen trap transition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0511714A GB2427080B (en) 2005-06-09 2005-06-09 Improvements in and relating to an electrical harness screen trap transition

Publications (3)

Publication Number Publication Date
GB0511714D0 GB0511714D0 (en) 2005-07-13
GB2427080A true GB2427080A (en) 2006-12-13
GB2427080B GB2427080B (en) 2010-07-14

Family

ID=34835346

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0511714A Expired - Fee Related GB2427080B (en) 2005-06-09 2005-06-09 Improvements in and relating to an electrical harness screen trap transition

Country Status (1)

Country Link
GB (1) GB2427080B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202013010013U1 (en) * 2013-11-02 2015-02-03 S + S Regeltechnik Gmbh Adapter for cable glands

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB818297A (en) * 1957-02-13 1959-08-12 Bendix Aviat Corp Electrical wiring harness
EP0476171A1 (en) * 1990-09-20 1992-03-25 DaimlerChrysler Aerospace Airbus Gesellschaft mit beschränkter Haftung Connection element for multipolar electrical plug connector
GB2324914A (en) * 1997-04-29 1998-11-04 New Chapel Electronics Limited Adaptors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB818297A (en) * 1957-02-13 1959-08-12 Bendix Aviat Corp Electrical wiring harness
EP0476171A1 (en) * 1990-09-20 1992-03-25 DaimlerChrysler Aerospace Airbus Gesellschaft mit beschränkter Haftung Connection element for multipolar electrical plug connector
GB2324914A (en) * 1997-04-29 1998-11-04 New Chapel Electronics Limited Adaptors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202013010013U1 (en) * 2013-11-02 2015-02-03 S + S Regeltechnik Gmbh Adapter for cable glands

Also Published As

Publication number Publication date
GB0511714D0 (en) 2005-07-13
GB2427080B (en) 2010-07-14

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20150609