EP0978850A2 - Multilayer flat cable - Google Patents

Multilayer flat cable Download PDF

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Publication number
EP0978850A2
EP0978850A2 EP99660123A EP99660123A EP0978850A2 EP 0978850 A2 EP0978850 A2 EP 0978850A2 EP 99660123 A EP99660123 A EP 99660123A EP 99660123 A EP99660123 A EP 99660123A EP 0978850 A2 EP0978850 A2 EP 0978850A2
Authority
EP
European Patent Office
Prior art keywords
cable
thin sheet
strip
multilayer
weakenings
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.)
Withdrawn
Application number
EP99660123A
Other languages
German (de)
French (fr)
Other versions
EP0978850A3 (en
Inventor
Jorma Pohjola
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.)
IWS International Oy
Original Assignee
IWS International Oy
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 IWS International Oy filed Critical IWS International Oy
Publication of EP0978850A2 publication Critical patent/EP0978850A2/en
Publication of EP0978850A3 publication Critical patent/EP0978850A3/en
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/0009Details relating to the conductive cores
    • H01B7/0018Strip or foil conductors

Definitions

  • the present invention relates to a multilayer flat cable of the type defined in the preamble of claim 1.
  • multilayer flat cables comprising a continuous strip of thin sheet which is folded for a multilayer flat cable as shown in fig. 1.
  • the folding zones present in the side edges of such cables tend to counteract the bending of a cable.
  • the cable fractures easily at its folding zones, which on its part contributes to rupturing the plastic coating of a cable.
  • the cable will have a bending arch which is discontinuous, as the bending occurs sharply at points of fracture.
  • An object of the invention is to provide a multilayer flat cable, which is more readily bendable and which is more durable as to its folding zones.
  • a cable 1 is made from a continuous strip of thin sheet 1a, the material of which preferably comprises copper.
  • the finished multilayer cable is coated with an insulation (not shown), the materials of which preferably comprise plastics generally used as a conductor insulation.
  • Fig. 2 depicts lengthwise folding zones A, B, C for the strip of thin sheet 1a, the number of which is three in the illustrated embodiment but the number of zones may range from one to five.
  • the strip of thin sheet 1a is pleated at the folding zones A, B, C for the multilayer flat cable 1 of fig. 1, having a height H which is about quadruple with respect to the material thickness of the thin sheet 1a, as well as a width which is about 1/4 with respect to the width of the thin sheet 1a.
  • the strip of thin sheet 1a of fig. 2 is machined at the folding zones A, B, C for elongated weakenings 2 lengthwise of the strip of thin sheet 1a, which in this embodiment comprise elongated successive cut-outs driven through the strip of thin sheet 1a.
  • the cut-outs 2 present in various folding zones A, B, C can be level with each other in the lateral direction of the strip of thin sheet 1a or staggered at different levels.
  • the cut-outs 2 can be successive, substantially circular holes, as shown in the folding zone B.
  • the weakenings 2 comprise continuous recesses or grooves lengthwise of the cable 1 and in line with each folding zone A, B, C.
  • the recesses or grooves 2 are made either by removing or displacing material.
  • the thickness of sheet material at the recesses or grooves has been reduced by 30 - 90 % from the original thickness.
  • the strip of thin sheet 1a is bent at each weakening 2 according to depicted curved arrows for the multilayer cable 1 of fig. 1.
  • the benefit provided by the recesses 2 for the cable 1 is the same as in the preceding embodiment.
  • a corresponding removal or displacement of material can also be effected after the bending, whereby weakenings 2a depicted in fig. 4 are worked by grinding or an equivalent technique to be flush with each other, while reducing the material thickness at the weakenings 2a.
  • the reduced thickness may vary between 70 - 10 % from the original thickness. This embodiment provides an improved fracture strength for the weakenings 2a.

Abstract

A multilayer flat cable (1), comprising a continuous strip of thin sheet (1a). The strip of thin sheet (1a) is provided with folding zones (A, B, C) extending lengthwise thereof, at which the strip of thin sheet (1a) is bent for the multilayer cable (1). In line with the folding zones (A, B, C) are weakenings (2, 2a) extending lengthwise of the cable (1).

Description

  • The present invention relates to a multilayer flat cable of the type defined in the preamble of claim 1.
  • Prior known are multilayer flat cables, comprising a continuous strip of thin sheet which is folded for a multilayer flat cable as shown in fig. 1. The folding zones present in the side edges of such cables tend to counteract the bending of a cable. As a result of sharp bends, the cable fractures easily at its folding zones, which on its part contributes to rupturing the plastic coating of a cable. In addition, the cable will have a bending arch which is discontinuous, as the bending occurs sharply at points of fracture.
  • An object of the invention is to provide a multilayer flat cable, which is more readily bendable and which is more durable as to its folding zones.
  • These objectives are achieved by means of a multilayer cable assembly as set forth in claim 1.
  • The non-independent claims disclose preferred embodiments of the invention.
  • The invention will now be described with reference to the accompanying drawings, in which
  • fig. 1
    shows a multilayer flat cable,
    fig. 2
    shows a strip of thin sheet according to one embodiment,
    fig. 3
    shows a strip of thin sheet according to a second embodiment of the invention in an axonometric view, and
    fig. 4
    shows a cable according to a third embodiment of the invention in a cross-section.
  • A cable 1 is made from a continuous strip of thin sheet 1a, the material of which preferably comprises copper. The finished multilayer cable is coated with an insulation (not shown), the materials of which preferably comprise plastics generally used as a conductor insulation.
  • Fig. 2 depicts lengthwise folding zones A, B, C for the strip of thin sheet 1a, the number of which is three in the illustrated embodiment but the number of zones may range from one to five. The strip of thin sheet 1a is pleated at the folding zones A, B, C for the multilayer flat cable 1 of fig. 1, having a height H which is about quadruple with respect to the material thickness of the thin sheet 1a, as well as a width which is about 1/4 with respect to the width of the thin sheet 1a.
  • Prior to folding to its final shape, the strip of thin sheet 1a of fig. 2 is machined at the folding zones A, B, C for elongated weakenings 2 lengthwise of the strip of thin sheet 1a, which in this embodiment comprise elongated successive cut-outs driven through the strip of thin sheet 1a. The cut-outs 2 present in various folding zones A, B, C can be level with each other in the lateral direction of the strip of thin sheet 1a or staggered at different levels. Alternatively, the cut-outs 2 can be successive, substantially circular holes, as shown in the folding zone B. Between the successive cut-outs 2 present in the same zone A, B, C remain webs 3, having a width in the lengthwise direction of the strip of thin sheet 1a within the range of 0,3 mm - 1 mm, most preferably 0,5 mm.
  • This removal of material from the folding zones A, B, C assits in folding the strip of thin sheet 1a into the multilayer cable 1, while the webs 3 nevertheless maintain the cable 1 as an integral element. The removal of material eliminates or essentially reduces intra-material stresses normally created in folding, which cause fractures occurring at the folding zones A, B, C, and thus contributes to the durability of a cable.
  • In the embodiment shown in fig. 3 (the strip of thin sheet 1a having its material thickness exaggerated in relation to the width), the weakenings 2 comprise continuous recesses or grooves lengthwise of the cable 1 and in line with each folding zone A, B, C. The recesses or grooves 2 are made either by removing or displacing material. The thickness of sheet material at the recesses or grooves has been reduced by 30 - 90 % from the original thickness. The strip of thin sheet 1a is bent at each weakening 2 according to depicted curved arrows for the multilayer cable 1 of fig. 1. The benefit provided by the recesses 2 for the cable 1 is the same as in the preceding embodiment.
  • A corresponding removal or displacement of material can also be effected after the bending, whereby weakenings 2a depicted in fig. 4 are worked by grinding or an equivalent technique to be flush with each other, while reducing the material thickness at the weakenings 2a. The reduced thickness may vary between 70 - 10 % from the original thickness. This embodiment provides an improved fracture strength for the weakenings 2a.
  • It is obvious that the above embodiments can be combined in a single cable 1, as desired.

Claims (5)

  1. A multilayer flat cable (1), comprising a continuous strip of thin sheet (1a), said strip of thin sheet (1a) being provided with folding zones (A, B, C) lengthwise thereof, at which the strip of thin sheet (1a) is bent for the multilayer cable (1), characterized in that in line with the folding zones (A, B, C) are weakenings (2, 2a) extending lengthwise of the cable (1).
  2. The cable (1) of claim 1, characterized in that the weakenings (2) comprise elongated cut-outs machined lengthwise of the strip of thin sheet (1a) prior to its bending.
  3. The cable (1) of claim 1 or 2, characterized in that between the longitudinally successive cut-outs (2) remain webs (3).
  4. The cable (1) of claim 1, characterized in that the weakenings (2) comprise recesses or grooves lengthwise of the cable (1) and in line with each folding zone (A, B, C).
  5. The cable (1) of claim 1, characterized in that the strip of thin sheet (1a) has a reduced material thickness which is substantially less at the weakening (2a) than elsewhere within the strip of thin sheet (1a).
EP99660123A 1998-08-04 1999-07-12 Multilayer flat cable Withdrawn EP0978850A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI981697A FI981697A (en) 1998-08-04 1998-08-04 Multilayer flat wire
FI981697 1998-08-04

Publications (2)

Publication Number Publication Date
EP0978850A2 true EP0978850A2 (en) 2000-02-09
EP0978850A3 EP0978850A3 (en) 2000-12-20

Family

ID=8552262

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99660123A Withdrawn EP0978850A3 (en) 1998-08-04 1999-07-12 Multilayer flat cable

Country Status (7)

Country Link
EP (1) EP0978850A3 (en)
JP (1) JP2000057856A (en)
CN (1) CN1244020A (en)
BR (1) BR9903419A (en)
CA (1) CA2279578A1 (en)
FI (1) FI981697A (en)
PL (1) PL334766A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20218891U1 (en) * 2002-12-05 2004-04-15 Ghw Grote & Hartmann Gmbh Electrical connector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102610299A (en) * 2011-01-19 2012-07-25 一诺科技股份有限公司 Low-impedance wire core and low-impedance lead as well as method for producing the wire core

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE130185C (en) *
GB1266367A (en) * 1968-07-30 1972-03-08
US5262590A (en) * 1992-04-27 1993-11-16 Sheldahl, Inc. Impedance controlled flexible circuits with fold-over shields

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE130185C (en) *
GB1266367A (en) * 1968-07-30 1972-03-08
US5262590A (en) * 1992-04-27 1993-11-16 Sheldahl, Inc. Impedance controlled flexible circuits with fold-over shields

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20218891U1 (en) * 2002-12-05 2004-04-15 Ghw Grote & Hartmann Gmbh Electrical connector

Also Published As

Publication number Publication date
PL334766A1 (en) 2000-02-14
JP2000057856A (en) 2000-02-25
CN1244020A (en) 2000-02-09
BR9903419A (en) 2001-03-20
FI981697A (en) 2000-02-05
CA2279578A1 (en) 2000-02-04
FI981697A0 (en) 1998-08-04
EP0978850A3 (en) 2000-12-20

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