EP0040877A1 - Metalldrahtseil mit Litzen paralleler Drähte - Google Patents

Metalldrahtseil mit Litzen paralleler Drähte Download PDF

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Publication number
EP0040877A1
EP0040877A1 EP81200523A EP81200523A EP0040877A1 EP 0040877 A1 EP0040877 A1 EP 0040877A1 EP 81200523 A EP81200523 A EP 81200523A EP 81200523 A EP81200523 A EP 81200523A EP 0040877 A1 EP0040877 A1 EP 0040877A1
Authority
EP
European Patent Office
Prior art keywords
filaments
metal wire
cord
strands
wire cord
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Withdrawn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
EP81200523A
Other languages
English (en)
French (fr)
Inventor
Vito Boschetto
Pietro Terragna
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.)
Gencord SpA
Original Assignee
Gencord SpA
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 Gencord SpA filed Critical Gencord SpA
Publication of EP0040877A1 publication Critical patent/EP0040877A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0606—Reinforcing cords for rubber or plastic articles
    • D07B1/0613—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the rope configuration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2033—Parallel wires
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2052—Cores characterised by their structure
    • D07B2201/2059—Cores characterised by their structure comprising wires
    • D07B2201/206—Cores characterised by their structure comprising wires arranged parallel to the axis

Definitions

  • the present invention relates to a metal wire. cord to be used for reinforcing articles made of rubber, elastomers, plastics and similar materials, such as conveyor belts, driving belts, high pressure pipes and mainly vehicle tires.
  • the known metal wire cords generally consist of strands with a predetermined length of lay or pitch, which are then laid up or twisted together to obtain the finished cord, which is generally comprised of a central core and an outer crown of filaments or strands.
  • a metal wire cord was recently developed for the above mentioned purposes, consisting of several strands of filaments grouped together without torsion, which are then subjected all together to a torsional winding operation, so that the average length of lay of all the filaments in the strands is equal to the average length of lay of the strands in the cord, and the core is not formed always by the same filaments, but on the contrary at any cross-section of the cord the core is represented by the filaments which at that point are at the centre of the bundle of filaments (DE 29 09 832 Al); in this way one obtains a cord with a rather open structure, thus suitable for penetration of rubber or plastics, but lacking of a well defined core, which is the necessary basis to obtain high properties of mechanical strength.
  • the present invention relates to a metal wire cord combining the advantages of the conventional cords having a core strand and a peripheral crown of strands or filaments as well as of the cords with parallel filaments wound together with a single pitch to from the cord but not wound around a core, at the same time eliminating the drawbacks of either prior type.
  • the metal wire cord according to the present invention consists in winding one or more outer strands around a core strand, with a normal length of lay comprised between 15 and 100 times the diameter of the strands forming the cord, and is characterized by the fact that the core strand is always in the central position, thus being always formed by the same filaments, and at least the outer strands are laid without twist, thus with a substantially infinite pitch or length of lay.
  • substantially infinite pitch or length of lay means a pitch or length of lay which is by far higher than any pitch or length of lay used in the technique of laying up ropes, cables and cords, and in any way of a length higher than 200 times the diameter of the single filaments forming the strand.
  • the core strand is without torsion, namely with a substantially infinite pitch, but it could also be a twisted strand, and moreover said core strand could comprise two or more filaments having the same or a different diameter with respect to those forming the outer strands, the latter being generally comprised of two or more filaments generally having the same diameter.
  • the diameter of the filaments normally but not necessarily used is 0.15 + 0.35 mm.
  • the metal wire cord according to the present invention may be produced with a conventional laying up machine, where the cord forming strands may come from more parallel filaments wound on the same reel and a certain number of these spools may be loaded on the laying up machine.
  • the method of making the cord according to the present invention is characterized by the fact that the cord forming strands are prepared in a preliminary stranding stage with a pitch equal to the pitch of the final cord, and for its manufacture a double torsion cord making machine is used, where the cord length of lay is of identical value but in the opposite direction of the strand lay, e.g. the cord lay is in the Z direction and the strand lay in the S direction, so that the final cord has parallel filaments in the strands and a core strand which is always the same.
  • the metal wire cord according to the present invention is shown in the single figure of the accompanying drawing, in one embodiment which is being given as a non limiting example only.
  • the figure shows diagrammatically a 7 x 4 cord construction, in which all the strands have an infinite pitch or length of lay.
  • the metal wire cord 1 consists of a core strand 2 around which six outer strands 3 (to make understanding easier only two outer strands are shown) are wound with a predetermined pitch.
  • the core strand 2 consists of four filaments which in the illustrative embodiment are not twisted one another, said filaments always taking the central position in the cord so as to form the cord core.
  • the outer strands 3 also consist of four filaments which in the illustrative embodiment have the same diameter of the core filaments, they are not twisted one another, but all the four filaments of a strand together are wound around the core with the same pitch of all the other outer strands, all being formed by four filaments not twisted to one another.
  • the outer strands consist of filaments parallel to one another and not twisted, this allows during use to have an easier penetration of rubber and the like around and between the filaments up to the cord inner core.
  • the resulting cord is uniform and with a regular geometric shape, with a well defined core having the function of support for the outer strands.
  • metal wires and generally steel wires may be used, having suitable features for the indicated purposes, which were subjected to any treatment known in the technique of manufacturing metal wire cords used for reinforcing articles made of rubber, elastomers, plastics and similar materials, such as conveyor belts, driving belts, high pressure pipes, and more particularly vehicle tires.

Landscapes

  • Ropes Or Cables (AREA)
EP81200523A 1980-05-26 1981-05-12 Metalldrahtseil mit Litzen paralleler Drähte Withdrawn EP0040877A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT22319/80A IT1197458B (it) 1980-05-26 1980-05-26 Corda metallica a trefoli con fili paralleli
IT2231980 1980-05-26

Publications (1)

Publication Number Publication Date
EP0040877A1 true EP0040877A1 (de) 1981-12-02

Family

ID=11194603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81200523A Withdrawn EP0040877A1 (de) 1980-05-26 1981-05-12 Metalldrahtseil mit Litzen paralleler Drähte

Country Status (2)

Country Link
EP (1) EP0040877A1 (de)
IT (1) IT1197458B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092696A2 (de) * 1982-04-26 1983-11-02 Akzo GmbH Verstärkungsseil für elastomere Erzeugnisse
EP0110437A1 (de) * 1982-10-22 1984-06-13 N.V. Bekaert S.A. Zusammengesetztes Verstärkungsseil für Elastomererzeugnisse
US4813221A (en) * 1983-12-20 1989-03-21 Bridin Plc. Flexible tension members
EP0781883A1 (de) * 1995-12-28 1997-07-02 Bridgestone Corporation Stahlseil zur Verstärkung eines Gummiartikels und solche Stahlseile aufweisender Luftreifen

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR914168A (fr) * 1942-10-07 1946-10-01 British Ropes Ltd Perfectionnements à la fabrication de cordes, de cordons et d'objets similaires, et en particulier, de câbles, de filins métalliques, et d'objets similaires
DE1918288A1 (de) * 1968-04-10 1969-10-23 Dunlop Co Ltd Korde
GB1190916A (en) * 1966-10-07 1970-05-06 Dunlop Co Ltd Improvements in or relating to Reinforced Rubber Articles
FR2087903A5 (de) * 1970-03-31 1971-12-31 Martinez Mario
US3726078A (en) * 1970-09-05 1973-04-10 Kobe Steel Ltd Steel cord and article including the same
LU65329A1 (de) * 1972-05-10 1973-11-22
US3922841A (en) * 1973-07-17 1975-12-02 Sumitomo Electric Industries Steel cord
US4022009A (en) * 1975-05-12 1977-05-10 Akzo N.V. Metallic cable
FR2453933A1 (fr) * 1979-04-13 1980-11-07 Tokyo Rope Mfg Co Procede de fabrication de cordes en acier et cordes obtenues selon ce procede

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR914168A (fr) * 1942-10-07 1946-10-01 British Ropes Ltd Perfectionnements à la fabrication de cordes, de cordons et d'objets similaires, et en particulier, de câbles, de filins métalliques, et d'objets similaires
GB1190916A (en) * 1966-10-07 1970-05-06 Dunlop Co Ltd Improvements in or relating to Reinforced Rubber Articles
DE1918288A1 (de) * 1968-04-10 1969-10-23 Dunlop Co Ltd Korde
FR2087903A5 (de) * 1970-03-31 1971-12-31 Martinez Mario
US3726078A (en) * 1970-09-05 1973-04-10 Kobe Steel Ltd Steel cord and article including the same
LU65329A1 (de) * 1972-05-10 1973-11-22
US3922841A (en) * 1973-07-17 1975-12-02 Sumitomo Electric Industries Steel cord
US4022009A (en) * 1975-05-12 1977-05-10 Akzo N.V. Metallic cable
FR2453933A1 (fr) * 1979-04-13 1980-11-07 Tokyo Rope Mfg Co Procede de fabrication de cordes en acier et cordes obtenues selon ce procede

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092696A2 (de) * 1982-04-26 1983-11-02 Akzo GmbH Verstärkungsseil für elastomere Erzeugnisse
EP0092696A3 (en) * 1982-04-26 1984-05-16 Akzo Gmbh Reinforcing cord for rubber products
EP0110437A1 (de) * 1982-10-22 1984-06-13 N.V. Bekaert S.A. Zusammengesetztes Verstärkungsseil für Elastomererzeugnisse
US4813221A (en) * 1983-12-20 1989-03-21 Bridin Plc. Flexible tension members
EP0781883A1 (de) * 1995-12-28 1997-07-02 Bridgestone Corporation Stahlseil zur Verstärkung eines Gummiartikels und solche Stahlseile aufweisender Luftreifen
US5819521A (en) * 1995-12-28 1998-10-13 Bridgestone Corporation Steel cord for reinforcing a rubber product and pneumatic tire using the same

Also Published As

Publication number Publication date
IT8022319A0 (it) 1980-05-26
IT1197458B (it) 1988-11-30

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19820511

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19830830

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TERRAGNA, PIETRO

Inventor name: BOSCHETTO, VITO