US3812666A - Double-twist stranding or cabling machine - Google Patents

Double-twist stranding or cabling machine Download PDF

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Publication number
US3812666A
US3812666A US00370336A US37033673A US3812666A US 3812666 A US3812666 A US 3812666A US 00370336 A US00370336 A US 00370336A US 37033673 A US37033673 A US 37033673A US 3812666 A US3812666 A US 3812666A
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United States
Prior art keywords
wires
twisting
axis
ropes
tracks
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Expired - Lifetime
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US00370336A
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English (en)
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M Sarracino
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Pirelli and C SpA
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Pirelli SpA
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Assigned to SOCIETA' PIRELLI S.P.A., A COMPANY OF ITALY reassignment SOCIETA' PIRELLI S.P.A., A COMPANY OF ITALY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INDUSTRIE PIRELLI S.P.A.
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/02—Stranding-up
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B3/00—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material
    • D07B3/08—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the take-up reel rotates about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the rope or cable on the take-up reel in fixed position and the supply reels are fixed in position
    • D07B3/10—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the take-up reel rotates about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the rope or cable on the take-up reel in fixed position and the supply reels are fixed in position with provision for imparting more than one complete twist to the ropes or cables for each revolution of the take-up reel or of the guide member
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B3/00—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material
    • D07B3/08—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the take-up reel rotates about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the rope or cable on the take-up reel in fixed position and the supply reels are fixed in position
    • D07B3/10—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the take-up reel rotates about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the rope or cable on the take-up reel in fixed position and the supply reels are fixed in position with provision for imparting more than one complete twist to the ropes or cables for each revolution of the take-up reel or of the guide member
    • D07B3/103—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the take-up reel rotates about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the rope or cable on the take-up reel in fixed position and the supply reels are fixed in position with provision for imparting more than one complete twist to the ropes or cables for each revolution of the take-up reel or of the guide member characterised by the bow construction
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/02—Machine details; Auxiliary devices

Definitions

  • ABSTRACT A double-twist stranding or cabling machine in which wires to be twisted pass through a hollow shaft to a pulley on a rotating arm to be twisted, then over a flexible transfer track to a second arm to be returned to a central take-up reel on a rocking cradle while being twisted again.
  • the flexible transfer tracks can be formed by steel ropes which are pulley mounted and spring tensioned to extend from a flat state to a curved state during operation of the machine. This flexibility of the tracks avoids the undesirable bending stresses which affect prior art transfer tracks or arcs, which are relatively rigid and inflexible.
  • the present invention relatesto ah improved doubletwist stranding or cabling machine. More particularly the machine of the invention is especially, but not exclusively, suitable for stranding individual bare wires to obtain cords or strands as well as for twisting or stranding insulated wires for the manufacture of telephone or power cables.
  • the wires to be stranded pass through a central cavity of the hollow rotating shaft and are conveyed towards wire-guiding means situated on the arm near the place where they emerge from the cavity in the shaft; at this point they are dragged into rotation along with the rotating arm, and are thus subjected to a first twist. From the point at which the wires are first twisted, the wires are guided by appropriate means to a transfer track which brings the wires which have already been subjected to the firsttwist towards thefacing surface of the opposite arm where, by means of guiding means secured to this second arm and symmetrical to those of the first arm, the wires are brought again to the axis of the twisting unit to be subjected to a second twist and tobe returned to rectilinear motion. Then the wires are collected on a drum.
  • Prior art machines of the above described type take-up" machines.
  • Stranding machines of a so-called outer take-up type are also known in which the wires to be-stranded follow a similar path, but in the reverse direction, from inside to outside the machine to be taken up outside the positions of the arms as opposed to inside as in the inner take-up type of machine.
  • the transfer tracks for transferring the wire from one arm to the other are formed as arcs.
  • the arcs ,of prior art twisting units have a curved shape approximating a parabola, designed to comply with the requirement that the unit occupy the minimum space and also intended to generate acceptable stresses on the various components of the machine during operation.
  • Arcs of various types are are called inner 2 the generally inflexible arcs of the prior art can sometimes cause the arcs to break.
  • the present invention aims at obviating the above indicated disadvantages by providing tracks for the transfer of the wires which are perfectly flexible and which, in operation, spontaneously take on the configuration required by the centrifugal forces involved, and therefore operate under tension alone.
  • the present invention relates to a double-twist stranding or cabling machine of the type in which the twisting unit comprises at least a pair of shafts, at least one of which shafts is hollow.
  • the shafts are aligned and each shaft carries an element shaped as a disc or arm perpendicular toand keyed to the shaft.
  • the discshaped elements or arms are spaced apart from one another, in an opposed face-to-face relationship and are connected by at least one pair of transfer tracks for the wire to be twisted.
  • Means for transferring and guiding the wire are provided on the shafts and on the disc-shaped elements or arms.
  • Each of the transfer tracks comprises at least one flexible element which is I able, under normal working conditions, to take on a configuration proportional at any point to the centrifugal forces involved.
  • Each transfer track has elastic means for recovering and limiting its own elongation.
  • FIG. 1 is a diagrammatical view of a preferred em- DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
  • the stranding orcabling machine illustrated in FIG. 1 is of the inner take-up" type and comprises supports 10 and 11, carrying a twisting unit generally indicated by the reference numeral 12.
  • the twisting unit 12 com- 3 prises two mutually aligned, rotatable shafts113 and 14.
  • the shafts 13 and 14 are seatedrespectively in seats 15 and 16 and are arranged to be driven by a driving system including a belt 17 for driving the shaft 13, a transmission shaft 18, and a belt 19 for driving the shaft 14. Both belts 17 and 19' are operatively connected to the transmission shaft 18 to synchronize the speed of the two shafts 13 and 14.
  • Each of the shafts 13 and 14 carries an arm, keyed to theshaft for rotation therewith. 1n the preferred embodiment shown inthe drawing, the anus 20 and 21 of the shafts 13 and 14 respectivelyare formed asdiscshaped elements hereinafter referred to as discs," but the arms could be conically or otherwise shaped elements extending generally perpendicular to the axis of rotation of the shaft.
  • Each of the shafts 13 and 14 also carries, mounted in proximity to its disc 20 or 21, a wire deflecting pulley 22 or 23, respectively.
  • . 27 are mounted on the discs 20, 21, respectively, just within the periphery of the discs 20,21 and in proximity to the ends of respective transfer tracks 28 and 29.
  • the straightline configurations of the tracks indicated by the dashed lines 28 and 29 show the tracks in rest position.
  • the curved configurations of. the tracks 28 and 29 shown in solid lines at 28a and29a indicate the elongation of said transfer tracks in'response to centrif. u gal force during operation under normal working conditions.
  • the track 28 behaves in operation as a true transfer track for carrying wires 30, which have been subjected to afirst twist.
  • the other track 29 serves only to counterbalance the track 28 during operation, and carries no wire.
  • the track 28 comprises two wire cables or steel ropes 31 and 32 but could alternatively have but a single rope.
  • the ropes 31 and 32 are stretched between the disc-shaped element 20 and the element 21 andare carried bythe races of lateral pulleys of the pulley groups 24 and 26.
  • FIG. 2 of the drawing shows only the lateral pulleys 33 and 34 of the pulley group 26, but it will be understood that the arrangement of the pulleys of group 24 at the disc 20 can be similar.
  • the rope 31 is carried by the race of pulley 33 and the rope 32 is carried by the race of pulley 31.
  • One end of each of the ropes 3'1, 32 can be secured directly to the outer face 44 of disc 20 and the other end of each rope 31, 32 engages the outer face 45 of disc 21 as shown in FIG. 2, through an elastic extension and recovery mechanism for each rope, namely the mechanism 47 for rope 31 and the mechanism 48 for rope 32.
  • the extension and recovery mechanisms 47 and 48 for the steel ropes 31 and 32 of the transfer track 28 allow the steel ropes to be extended to a limited decree to take on a curved configuration under tension in response to centrifugal forces resulting from rotation of the twisting unit 12 and also provide for recovery, i.e., shortening and straightening of the transfer track 28 from the extended operating position (28a of FIG. 1) when the centrifugal forces decrease.
  • the recovery mechanism 48 is a mirror symmetrical image of the mechanism 47, so the mechanism 47 will be described with odd reference numbers and even refments of the recovery unit 48.
  • the extension and recovery mechanism 47 (48) comprises a race pulley 35 (36) pivoted about its center 37 (38).
  • the rope 31 (32), whose terminal portion is secured in said race, is locked in place at its end by a clamp 39 (40) with which the pulley 35 (36) is provided.
  • An abutment means (not shown in FIG. 2) is provided on the face of pulley 35 (36) which is directed towards disc 21, to engage a corresponding stop (only stop 71 being shown in FIG. 2 beneath the broken- I away portion of the pulley 36) provided on the outer face 45 of disc 21.
  • This stop is arranged at a perdetermined position in order to limit the extent of travel of pulley 35 (36) and the corresponding elongation of spring 41 (42) in response to the effect of centrifugal force on the track 28 when the twisting unit 12 is operative.
  • track 29 is provided only for the purpose of counterbalancing track 28 during operation.
  • track 29 comprises two steel ropes 51 and 52 which, stretched between the disc-shaped elements 20 and 21, pass in the races of the two pulleys forming each of the pulley groups 25 and 27 (FIG. 2 shows pulleys 53 and 54 of group 27, respectively, for ropes 51 and 52), so that one end of each rope can be secured directly to the outer face 44 of disc20 and the other end of each rope engages the outer face 45 of disc 21 through'an elastic recovery mechanism for each rope, namely mechanism 67 for rope 51 and mechanism 68 for rope 52.
  • the mechanisms 67 and 68 are similar to the mechanisms 47 and 48 described above and a similar reference numeral convention is followed.
  • Each recovery mechanism 67 (68) of track 29 thus comprises, as in the case of track 28, a race pulley 55 (56) pivoted at its center 57 (58).
  • the rope 51 (52), whose terminal portion is carried in said race, is locked at its end to the pulley 55 (56) by the clamp 59 (60) with which pulley 55 (56) isprovided.
  • An abutment means provided on the face of pulley 55 (56) which is directed towards disc 21 is able to engage a corresponding stop provided on the outer face 45 of disc 21,to limit to a pre-established extent the travel of pulley 55 (56) and the elongation of spring 61 (62) under the effect of centrifugal force when the twisting unit 12 is operative.
  • E16. 3 shows only abutment means 63 provided on face 50 of pulley 56, for engaging stop 64, but it will be understood that similar abutment means and stops are provided for the other pulleys 35, 36 and 55.
  • the ropes 31 and 32, 51 and 52 could also be provided with recovery mechanisms at the other disc 20 for extension and recovery of the ropes at the outer faces 44 and 45 of both discs 20 and 21.
  • each of said extension and recovery mechanisms 47, 48, 67, 68 can, of course, be different from those of the currently preferred embodiment described above.
  • each of said extension and recovery mechanisms can, for instance, comprise a slider slidable in appropriate guides, the slider being connected at one end to a helical spring, the other end of which spring is secured to the outer face of the corresponding disc.
  • the travel of the slider can be limited by an upper stop, with the length of the rope constituting the lower limit for the sliders travel.
  • Each pulley group 25 and 27 comprises only two pulleys, for example, pulleys 53 and 54 of group 27, but the pulley groups 24 and 26 comprise three pulleys, namely two lateral pulleys, e.g., the pulleys 33 and 34 of group 26, by which the two ropes 31 and 32 are deflected, as well as an intermediate pulley, shown at 43 in group 26.
  • the intermediate pulley 43 serves as a guide for the wire 30 to be twisted and is located between the pulleys 33 and 34. All three pulleys 33, 34 and 43 could be on a common shaft.
  • Bushes 46 are provided around the track 28 at appropriately spaced positions to serve as a guide for the wires 30.
  • the bushes 46 also act as spacing elements to keep constant the distance between the ropes 31 and 32.
  • Analogous spacing elements 49 are provided around the track 29. If necessary, said bushes 46, and for symmetry also the bushes 49, could be replaced by a flexible hose, appropriately connected to the ropes.
  • the hollow shaft 14 has a cylindrical cavity 65 coaxial with the shaft 14.
  • the wire-engaging circumferential surface of the deflecting pulley 23 is aligned with the cavity 65 to receive wire approaching the pulley 23 through the cavity 65.
  • the disc is also provided with a cylindrical cavity therethrough (not shown) aligned with the wire receiving surface of the deflecting pulley 22.
  • rocking cradle 66 Between disc 20 and disc 21 there is a rocking cradle 66, schematically shown in FIG. 1, upon which are mounted a take-up reel 72 for twisted wire and deflecting pulleys 69 and 70. ln a stranding or cabling machine of the outer take-up" type otherwise corresponding to the inner take-up machine of the preferred embodiment shown in the drawing, the cradle 66 would house the wire supplying reels instead of the take-up reel.
  • the wires 30 to be twisted or stranded are arranged, while the machine is in restcondition, by unwinding them from supply reels (not illustrated) disposed outside the twisting unit 12.
  • the wires are caused to advance in the direction of the arrow F in FIG. 1 along a path through the central cavity 65 of the shaft 14 to the deflecting pulley 23, over the pulley 43, through bushes 46, over the intermediate pulley of the pulley group 24, over the deflecting pulley 22, through the cylindrical cavity of the disc 20, over the pulleys 69, pulley 70, and are then anchored to reel 72.
  • the wires 30, which advance with a translatory motion only through the cylindrical cavity 65 of the hollow shaft 14, are subjected to a first twist at the pulley 23, where they are compelled to twisting movement by the rotational motion transmitted tothe pulley 23 by the rotating shaft 14.
  • the wires simply stranded in this way, pass on to the pulley 43 and, through the bushes 46 of track 28, are conveyed to the intermediate pulley of group 24 and then to the deflecting pulley 22.
  • the wires 30 After passing over the pulley 22 the wires 30 pass through the cylindrical cavity through disc 20 and are wound up on the winding drum or reel 72 mounted on the cradle 66. Since the cradle 66 and take-up reel 72 do not take part in the rotation of the twisting unit 13, the wires are subjected to a second twist between the pulley 22 and the pulley 69.
  • a wire stranding machine having a twisting unit comprising a pair of twisting means rotatable about a predeterminedaxis for receiving and twisting a plurality of wires, said twisting means being spaced from each other in the direction of said axis, and means for supplying said wires to and receiving stranded wires from said pair of twisting means, the combination therewith of at least a pair of flexible track means extending between said twisting'means, one of said track means being disposed to guide said wires from one of said twisting means to the other thereof and being disposed at one side of and in spaced relation to said axis and the other of said track means being disposed at the opposite side and in spaced relation to said axis, means for securing one end of each of said tracks at one end to one of said twisting means, means for securing the opposite end of each of said tracks to the other of said twisting means for rotation of said tracks around said axis, said tracks being free intermediate their ends to move outwardly with respect to
  • said twisting means comprises a pair of rotatwardly thereof, first guide means mounted on said one shaft and spaced outwardly from said axis for receiving said wires from said opening and supplying said wires to one end of one of said track means, said first guide means being rotatable around said axis by saidone shaft, second guide means mounted on the other of said shafts and spaced outwardly from said axis for receiving said wires from the other end of said last-mentioned one of said track means, said second guide means being rotable around said axis by said other shaft and further comprising means for receiving said wires from said second guide means.
  • said elastic means comprises a tension apply ing member movably mounted on one of said shafts for rotation therewith, means for securing the ends of said ropes nearer said one shaft to said member, spring means acting on said member in a direction which tends to elongate said ropes and stop means for limiting movement of saidmember in the opposite direction.
US00370336A 1972-06-22 1973-06-15 Double-twist stranding or cabling machine Expired - Lifetime US3812666A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT26026/72A IT959891B (it) 1972-06-22 1972-06-22 Macchina cordatrice o trefolatrice a doppia torsione perfezionata

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US00370336A Expired - Lifetime US3812666A (en) 1972-06-22 1973-06-15 Double-twist stranding or cabling machine

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US (1) US3812666A (pt)
AR (1) AR197990A1 (pt)
BR (1) BR7304494D0 (pt)
CA (1) CA975631A (pt)
DE (1) DE2330409C2 (pt)
ES (1) ES416326A1 (pt)
FR (1) FR2189831B1 (pt)
GB (1) GB1440613A (pt)
IT (1) IT959891B (pt)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945182A (en) * 1974-11-19 1976-03-23 General Cable Corporation Twisting machine flyer bow
US4339909A (en) * 1979-07-09 1982-07-20 Jean Godderidge Rotary quadrants of cable-making machines
US4446688A (en) * 1981-03-31 1984-05-08 Hamana Iron Work Co., Ltd. Double twisting machine
US4473995A (en) * 1983-02-01 1984-10-02 Southwire Company Concentric compressed double twist stranded cable
US4485614A (en) * 1981-01-13 1984-12-04 Ab Kompositprodukter S.K.F.M. Rotatable flyer
US5994647A (en) * 1997-05-02 1999-11-30 General Science And Technology Corp. Electrical cables having low resistance and methods of making same
US6019736A (en) * 1995-11-06 2000-02-01 Francisco J. Avellanet Guidewire for catheter
US6049042A (en) * 1997-05-02 2000-04-11 Avellanet; Francisco J. Electrical cables and methods of making same
US6137060A (en) * 1997-05-02 2000-10-24 General Science And Technology Corp Multifilament drawn radiopaque highly elastic cables and methods of making the same
US6215073B1 (en) 1997-05-02 2001-04-10 General Science And Technology Corp Multifilament nickel-titanium alloy drawn superelastic wire
US6313409B1 (en) 1997-05-02 2001-11-06 General Science And Technology Corp Electrical conductors and methods of making same
US6399886B1 (en) 1997-05-02 2002-06-04 General Science & Technology Corp. Multifilament drawn radiopaque high elastic cables and methods of making the same
US6449834B1 (en) 1997-05-02 2002-09-17 Scilogy Corp. Electrical conductor coils and methods of making same
US20050015978A1 (en) * 2003-07-21 2005-01-27 Ryan Andersen Method and apparatus for producing stranded aluminum cables
EP1525147A2 (en) * 2002-07-29 2005-04-27 Bartell Machinery Systems, LLC. Flyer bow apparatus with travelling carrier strip
CN103219093A (zh) * 2013-04-25 2013-07-24 浙江保龙机械有限公司 绞线机张力调整装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2732503B1 (fr) * 1995-03-31 1997-04-30 Filotex Sa Procede d'assemblage et de rubanage de conducteurs

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773344A (en) * 1951-04-12 1956-12-11 Charles F Van Hook Vertical twisting machine
US2921429A (en) * 1960-02-01 1960-01-19 Delore Sa Geoffroy Systems for producing multi-strand twisted assemblies such as cables
US3142952A (en) * 1962-05-08 1964-08-04 Anaconda Wire & Cable Co Stranding apparatus
US3309857A (en) * 1963-04-12 1967-03-21 Delore Sa Geoffroy Apparatus for processing cable-like elements

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE568191C (de) * 1933-01-16 Adolf Meyer Doppeldraht-Zwirnspindel
US2457402A (en) * 1947-04-18 1948-12-28 Wire Machinery Corp Of America Wire-stranding machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773344A (en) * 1951-04-12 1956-12-11 Charles F Van Hook Vertical twisting machine
US2921429A (en) * 1960-02-01 1960-01-19 Delore Sa Geoffroy Systems for producing multi-strand twisted assemblies such as cables
US3142952A (en) * 1962-05-08 1964-08-04 Anaconda Wire & Cable Co Stranding apparatus
US3309857A (en) * 1963-04-12 1967-03-21 Delore Sa Geoffroy Apparatus for processing cable-like elements

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945182A (en) * 1974-11-19 1976-03-23 General Cable Corporation Twisting machine flyer bow
US4339909A (en) * 1979-07-09 1982-07-20 Jean Godderidge Rotary quadrants of cable-making machines
US4485614A (en) * 1981-01-13 1984-12-04 Ab Kompositprodukter S.K.F.M. Rotatable flyer
US4446688A (en) * 1981-03-31 1984-05-08 Hamana Iron Work Co., Ltd. Double twisting machine
US4473995A (en) * 1983-02-01 1984-10-02 Southwire Company Concentric compressed double twist stranded cable
US6019736A (en) * 1995-11-06 2000-02-01 Francisco J. Avellanet Guidewire for catheter
US6137060A (en) * 1997-05-02 2000-10-24 General Science And Technology Corp Multifilament drawn radiopaque highly elastic cables and methods of making the same
US6049042A (en) * 1997-05-02 2000-04-11 Avellanet; Francisco J. Electrical cables and methods of making same
US5994647A (en) * 1997-05-02 1999-11-30 General Science And Technology Corp. Electrical cables having low resistance and methods of making same
US6215073B1 (en) 1997-05-02 2001-04-10 General Science And Technology Corp Multifilament nickel-titanium alloy drawn superelastic wire
US6248955B1 (en) 1997-05-02 2001-06-19 General Science And Technology Corp Electrical cables having low resistance and methods of making the same
US6313409B1 (en) 1997-05-02 2001-11-06 General Science And Technology Corp Electrical conductors and methods of making same
US6399886B1 (en) 1997-05-02 2002-06-04 General Science & Technology Corp. Multifilament drawn radiopaque high elastic cables and methods of making the same
US6449834B1 (en) 1997-05-02 2002-09-17 Scilogy Corp. Electrical conductor coils and methods of making same
EP1525147A2 (en) * 2002-07-29 2005-04-27 Bartell Machinery Systems, LLC. Flyer bow apparatus with travelling carrier strip
EP1525147A4 (en) * 2002-07-29 2006-08-23 Bartell Mach Sys Llc FLYER BAILING DEVICE WITH ROLLER BELT
US20050015978A1 (en) * 2003-07-21 2005-01-27 Ryan Andersen Method and apparatus for producing stranded aluminum cables
CN103219093A (zh) * 2013-04-25 2013-07-24 浙江保龙机械有限公司 绞线机张力调整装置

Also Published As

Publication number Publication date
FR2189831B1 (pt) 1977-05-13
GB1440613A (en) 1976-06-23
FR2189831A1 (pt) 1974-01-25
ES416326A1 (es) 1976-02-16
DE2330409C2 (de) 1985-05-23
DE2330409A1 (de) 1974-03-21
AR197990A1 (es) 1974-05-24
AU5714773A (en) 1975-01-09
BR7304494D0 (pt) 1974-08-22
IT959891B (it) 1973-11-10
CA975631A (en) 1975-10-07

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Legal Events

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AS Assignment

Owner name: SOCIETA PIRELLI S.P.A., PIAZZALE CADORNA 5, 20123

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INDUSTRIE PIRELLI S.P.A.;REEL/FRAME:003847/0084

Effective date: 19810101