US3736739A - Winding machine - Google Patents

Winding machine Download PDF

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Publication number
US3736739A
US3736739A US00205896A US3736739DA US3736739A US 3736739 A US3736739 A US 3736739A US 00205896 A US00205896 A US 00205896A US 3736739D A US3736739D A US 3736739DA US 3736739 A US3736739 A US 3736739A
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US
United States
Prior art keywords
flange plate
reels
annular member
threads
rotation
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.)
Expired - Lifetime
Application number
US00205896A
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English (en)
Inventor
M Buc
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.)
Bpifrance Financement SA
Original Assignee
Agence National de Valorisation de la Recherche ANVAR
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Filing date
Publication date
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Publication of US3736739A publication Critical patent/US3736739A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H57/00—Guides for filamentary materials; Supports therefor
    • B65H57/18—Guides for filamentary materials; Supports therefor mounted to facilitate unwinding of material from packages
    • B65H57/20—Flyers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/60—Winding and joining, e.g. winding spirally helically using internal forming surfaces, e.g. mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H81/00—Methods, apparatus, or devices for covering or wrapping cores by winding webs, tapes, or filamentary material, not otherwise provided for
    • B65H81/06—Covering or wrapping elongated cores
    • B65H81/08—Covering or wrapping elongated cores by feeding material obliquely to the axis of the core
    • 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
    • D07B7/14—Machine details; Auxiliary devices for coating or wrapping ropes, cables, or component strands thereof
    • 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
    • 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
    • H01B13/06—Insulating conductors or cables
    • H01B13/08—Insulating conductors or cables by winding

Definitions

  • SHEET UF 4 WINDING MACHINE This invention relates to an automatic machine for winding on a cylindrical element which may be tubular and passes through this machine successive layers of threads or ribbons which are delivered from a series of reels carried by the machine, and the turns of which do not have any breaks in continuity, especially when one or a number of such reels has been completely emptied and an appreciable period of time is required to replace them with new reels.
  • the cylindrical element is tubular and comprises an inner sheath of plastic material and windings of external reinforcement threads or ribbons, especially of glass fibers, which are intended to be continuously impregnated with a hardenable binder
  • this interruption of the manufacturing process which is made necessary by the replacement of one or a number of reels on the rotary flange plate can result in further drawbacks such as excessive and nonuniform impregnation of the glass fibers on the stopped tubular element, hardening of the binder before the proper time or even detachment of the inner sheath and of its reinforcement windings.
  • This invention is directed to an improved winding machine which overcomes the above-mentioned disadvantages by permitting replacement of reels from which threads or ribbons have been completely unwound without interrupting the operation of the machine and the formation of a continuous winding on the cylindrical element.
  • the winding machine under consideration essentially comprises two parallel coaxial flange plates each provided with an assembly of reels uniformly spaced about their common axis and carrying threads or ribbons to be wound on a cylindrical element in continuous displacement along the axis of the two flange plates which are driven separately in rotation about said axis, each flange plate being associated with an annular member which is coaxial with and parallel to said flange plate, said annular member being mounted upstream of the reels with respect to the direction of displacement of the cylindrical element, means for subjecting the annular members to a relative movement of rotation in the direction opposite to the movement of the corresponding flange plates and means provided on the annular members for attaching and cutting the ends of the threads or ribbons of the reels.
  • the second flange plate does not play any part in this initial winding stage until the thickenss of the thread on one or a number of the reels of the first rotary flange plate, as controlled by any suitable means of the feeler type in particular, reaches a predetermined lower limit and initiates the delivery of an electrical or mechanical signal.
  • this second flange plate can be driven continuously in rotation about its axis or else it can be started up only at the moment at which the above-mentioned signal is delivered, prior to complete emptying of any reel of the first flange plate, the advantage of the first solution being to avoid the delay in setting the flange plate in rotation. From this moment and as a result of the synchronous rotation of the annular member and of the flange plate, there does not take place any contact between the threads of the reels and the cylindrical element which continues its forward motion within the machine.
  • a second signal initiates the operation of means which produce a relative rotation of the annular member associated with the second flange plate with respect to this latter in the direction which causes said annular member to lag with respect to said flange plate.
  • the reel threads come into contact with the cylindrical element and, by reason of the fact that the annular member is mounted upstream of these reels, initial winding of the threads takes place with the same orientation with respect to the axis of the element but in the direction opposite to the normal direction, that is to say for at least a few revolutions, from the downstream end to the upstream end on the cylindrical element which continues its displacement within the machine.
  • the first flange plate can then be stopped in order to permit replacement of the empty reel or reels and then remains motionless or is again set in rotation in a standby position until the completed unwinding of the thread from one or a number of the reels of the second flange plate in turn causes the further relative rotation of the annular member of the first flange plate and the continuation of the winding operation in accordanc with the process described.
  • the signals which actuate the flange plates and/or their associated annular members are necessarily produced in such manner as to ensure that there always takes place a partial overlapping of the windings of the threads delivered from the reels of either one flange plate or the other at the time of changeover of these latter.
  • Each flange plate preferably comprises an even number of reels, the ends of the threads or ribbons of these reels being joined together in pairs by means for attaching to and cutting on the coaxial annular member.
  • the threads or ribbons pass through radial guide rings which are carried by the corresponding flange plate.
  • the attaching and cutting means are constituted by knives disposed on that face of the annular member which is located opposite to the reels of the flange plate in a plane which passes through the axis of this latter, these knives being provided with a curved cutting edge of which the concave portion is directed towards the periphery of the annular member.
  • the means for subjecting each annular member to a relative movement of rotation with respect to the corresponding flange plate are constituted by a driving shaft which is driven in rotation through a reductiongear unit by means of a motor carried by the flange plate and effects the rotation of a friction roller in rubbing contact with a track formed in the annular member, said annular member being supported on ballbearings by means of a coaxial cylindrical member which is rigidly fixed to the flange plate.
  • each reel comprises a tubular support fitted over a shaft located at right angles to the plane of the corresponding flange plate and having an extension on which is pivotally mounted a right-angle bracket provided with eyelets traversed by the thread which is unwound from the reel and a counterweight for the continuous balancing of said right-angle bracket.
  • FIGS. 1 and 2 ar diagrammatic views of the winding machine under consideration and serve to explain the general principle of operation of the machine
  • FIG. 3 is a longitudinal sectional view of one-half of the winding machine considered
  • FIG. 4 is a partial front view of the half-winder which is illustrated in FIG. 3
  • FIGS. 5 and 6 are general arrangement diagrams which serve to explain the operation of this winding machine.
  • the reference A designates in particular a tubular cylindrical element which is driven by any suitable means (not shown in the drawings) in a continuous axial movement of displacement through the winding machine considered, this movement of displacement being shown diagrammatically by the arrow B.
  • the winding machine essentially comprises two parallel rotary flange plates in oppositely-facing relation and designated respectively by the references C and D, the flange plate C being intended to support a series of reels of which only two reels E and E appear in the figures whilst the flange plate D supports reels F and F in the same manner.
  • the threads or ribbons G, and G which are unwound from the reels E and E pass at H through guide rings which bring them substantially at the exits of these reels in a radial direction towards the tubular element A taking into account the rotation of the flange plate'C and the forward motion of the element A, this causes the continuous winding of these threads on said element as shown diagrammatically at I.
  • a feeler or the like (not shown) delivers an electrical signal which starts up a motor and initiates the rotation of the second flange plate D and of the annular member L which is associated therewith.
  • the annular member and the flange plate can be continuously drive in synchronous rotation. Taking into account the position of the threads J and J which are derived from the reels F and F this synchronous rotation takes place freely without thereby placing the element A in contact with the threads J and J2.
  • a second signal produces by means of a second motor or by means of any other suitable device the relative rotation of the annular member L with respect to the rotary flange plate D and especially a retardation of said annu lar member which lags with respect to the flange plate.
  • the winding I which is formed on the element A is therefore carried out in the machine without any discontinuity whilst the two flange plates C or D are put into service in alternate sequence, the control signals which are necessary for the changeover of these latter being produced at instants which are suitably spaced in time so as to result simply in overlapping of the threads G and J on the element A over a distance M (FIG. 2) which depends on the speed of forward motion of the element through the machine and on the speed of rotation of the flange plates.
  • FIGS. 3 and 4 illustrate to a larger scale the constructional detail of one-half of the winding machine described above, namely of a rotary flange plate and of the associated annular member.
  • the assembly is mainly composed of a supporting frame 1 having a base plate 2 which serves to secure the frame to a bed 3.
  • This frame 1 is provided along its axis with a bore 4 having sufficient dimensions to permit any tubular element 5 on which it is desired to form a continuous winding of threads or ribbons to pass freely through the frame 1 and especially to carry out a uniform forward movement of displacement within the apparatus.
  • the frame 1 is provided in its external surface with bearings 6 and 7 for supporting coaxially with the axis of the bore 4 a cylindrical sleeve 8 which is thus capable of rotating freely about the element 5.
  • This sleeve 8 is provided at one of its extremities with a circular flange plate 9 which extends at right angles to the axis of the element 5 and on which is mounted an assembly of half-shafts such as 10. These half-shafts are uniformly spaced over the circumference of the flange plate and are each intended to support a reel 11 of threads or ribbons of the material which is to be wound on the element 5.
  • each half-shaft 10 is further provided with an extension 14 on which is pivotally mounted a right-angle bracket 15 having a horizontal return 16 provided with eyelets 17 and 18 for the passage of the thread of the corresponding reel and with an axial guide ring 19.
  • a counterweight 20 continuously balances the right-angle bracket 15 on the extension 14.
  • the sleeve 8 is provided at the end remote from the flange plate 9 with a flat annular shoulder 24 joined by spacer members 25 to a cylindrical member 26 which is coaxial with the sleeve 8 and consequently with the tubular element 5 which passes through the bore 4.
  • a circular ring 28, or annular member which extends parallel to the plane of the flange plate 9.
  • said annular member 28 is fitted with a set of knives 29 and the cutting edge of each knife has a curved shape which is directed towards the exterior of the annular member 28.
  • said knives 29 perform the functiono of means for attaching and cutting the ends of the threads carried by the reels of the flange plate 9 and taken in pairs.
  • the number of knives 29 is one-half the number of reels 11 on the flange plate 9 and provision is consequently made for an even number of these latter.
  • the relative rotation of the annular member 28 can be carried out with respect to the flange plate 9 by means of the sleeve 8 which carries an electric motor 34, the supply of current to the motor being effected by means of contacts 34a applied against collectors 34b which are provided in the external surface of the frame 1.
  • the shaft of said motor 34 is connected by means of a coupling member 35 to a shaft 36 at the end of which is carried a roller 37 and this latter is intended to bear on the external surface 38 of the annular member 28 which forms a friction track and permits the relative rotation of this latter on the rollerbearings 27.
  • FIG. 5 and 6 illustrate diagrammatically the method of operation of the half-winder which has been described in the foregoing.
  • a preparatory stage in which the reels ll of the flange plate 9 are not employed for the purpose of forming the winding of the element 5 (this latter being formed, for example, by the second half-winder in the manner which was mentioned earlier with reference to FIGS. 1 and 2), the threads 21 of these reels are first passed through the guides 22, then joined together in pairs from one reel to one of the adjacent reels and so on in sequence between all the reels on the flange plate. The ends of the threads which are thus joined together are then brought substantially radially in a direction opposite to that of the element 5 in order to be attached to the cutting portions of the knives 29.
  • the threads 21 are not subjected to any tension and are unwound from the reels 1] over the distance which is necessary to bring them to the knives 29 through the eyelets l7 and 18, the guide rings 19 and the guides 22.
  • the motor 34 is in turn controlled so that a relative displacement of the annular member 28 in the direction opposite to the flange plate 9 should take place independently of the rotation of said flange plate and said annular member, thus resulting in an orientation of the ends of the threads 21 which is increasingly tangential to the surface of the element 5.
  • the threads come into contact with the element and are wound on this latter in the direction opposite to the normal direction, that is to say from the downstream to v the upstream end.
  • the tension applied to the threads 21 increases until the knives 29 produce action by cutting said threads and freeing them from the annular member which can then be stopped by interrupting the supply of current to the motor 34, for example.
  • the winding of the threads is resumed in the opposite direction, or in other words, reverts to the normal direction, by covering the turns of threads which were previously formed and securing them to the element which continues its forward motion within the machine without interruption.
  • an automatic winding machine which permits continuous winding of threads or the like on a cylindrical and especially tubular element but in which the stoppages arising from the need to replace empty reels do not result in any interruption of the winding operation itself.
  • Each half-winder is employed in turn, the operating time of one being considerably longer than the period which is necessary to replenish the other.
  • the instants of start-up of each halfwinder are determined by any suitable control means in order to provide a sufficient overlap of corresponding windings.
  • a continuous winding machine wherein said machine comprises two parallel coaxial flange plates each provided with an assembly of reels uniformly spaced about their common axis and carrying threads or ribbons to be wound on a cylindrical element in continuous displacement along the axis of the two flange plates which are driven separately in rotation about said axis, each flange plate being associated with an annular member which is coaxial with and parallel to said flange plate, said annular member being mounted upstream of the reels with respect to the direction of displacement of the cylindrical element, means for subjecting the annular members to a relative movement of rotation in the direction opposite to the movement of the corresponding flange plates and means provided on the annular members for attaching and cutting the ends of the threads or ribbons of the reels.
  • each flange plate comprises an even number of reels, the ends of the threads or ribbons of said reels being joined together in pairs by means for attaching to and cutting on the coaxial annular member.
  • attaching and cutting means are constituted by knives disposed on that face of the annular member which is located opposite to the reels of the flange plate in a plane which passes through the axis of said flange plate, said knives being provided with a curved cutting edge of which the concave portion is directed towards the periphery of said annular member.
  • each reel comprises in each flange plate a tubular support fitted freely over a shaft located at right angles to the plane of the corresponding flange plate, said shaft being provided with an extension on which is pivotally mounted a right-angle bracket provided with eyelets traversed by the thread which is unwound from the reel and a counterweight for the continuous balancing of said right-angle bracket.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Winding Filamentary Materials (AREA)
US00205896A 1970-12-11 1971-12-08 Winding machine Expired - Lifetime US3736739A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7044649A FR2116909A5 (fr) 1970-12-11 1970-12-11 Bobineuse

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US3736739A true US3736739A (en) 1973-06-05

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US00205896A Expired - Lifetime US3736739A (en) 1970-12-11 1971-12-08 Winding machine

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US (1) US3736739A (it)
CA (1) CA955222A (it)
DE (1) DE2160867A1 (it)
FR (1) FR2116909A5 (it)
GB (1) GB1343503A (it)
IT (1) IT943227B (it)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3934395A (en) * 1974-12-19 1976-01-27 Reynolds Metals Company Cable stranding apparatus
US4516394A (en) * 1982-09-07 1985-05-14 Celanese Corporation Yarn package for spiralers
US4555898A (en) * 1983-08-22 1985-12-03 Les Cables De Lyon Apparatus for stranding armor wires about a cable core, and method implemented by the apparatus
US4607481A (en) * 1982-09-07 1986-08-26 Celanese Corporation Process for spiral wrapping reinforcement filaments
US5111646A (en) * 1989-01-03 1992-05-12 Stolberger Maschinenfabrik Gmbh & Co. Kg Tape wrapping device with plural independently rotatable spool carriers
US20030201060A1 (en) * 1999-06-14 2003-10-30 Hauber David Edgar Reinforced thermoplastic pipe manufacture
US20060107644A1 (en) * 2004-11-23 2006-05-25 Dye Don L Method for producing a multielectrode lead
ES2307439A2 (es) * 2007-11-26 2008-11-16 Pinter, S.A. Procedimiento y maquina para fabricar hilos recubiertos e hilo recubierto fabricado con el mismo.
US20100300624A1 (en) * 2007-05-18 2010-12-02 Mauro Nava Spiral winding machine with motorized coils
US20110072658A1 (en) * 2009-09-30 2011-03-31 Don Dye System and method for fabricating a stimulation lead
US8484841B1 (en) 2010-03-31 2013-07-16 Advanced Neuromodulation Systems, Inc. Method of fabricating a stimulation lead for applying electrical pulses to tissue of a patient
US20190126567A1 (en) * 2016-05-11 2019-05-02 Contitech Mgw Gmbh Method for making a charge air hose
US20240269940A1 (en) * 2021-06-07 2024-08-15 Korea Aerospace Research Institute Fiber winding device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2422762A1 (fr) * 1978-04-11 1979-11-09 Pourtier Pere Fils Ets Dispositif de cablage par torsions alternees
FR2567864A1 (fr) * 1984-07-19 1986-01-24 Sciard Alain Dispositif de traction lineaire pour le deplacement de charges telles que tiges, tuyaux rigides ou flexibles, cables ou plus generalement des objets dont les dimensions axiales sont importantes par rapport a leurs dimensions transversales
US5893383A (en) * 1997-11-25 1999-04-13 Perfclean International Fluidic Oscillator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2281111A (en) * 1939-09-23 1942-04-28 Nat Electric Prod Corp Nonmetallic sheath cable
US2918777A (en) * 1958-11-12 1959-12-29 Goodrich Co B F Hose making apparatus
US3037343A (en) * 1957-04-11 1962-06-05 Goodrich Co B F Method and apparatus for manufacturing hose
US3111803A (en) * 1961-07-27 1963-11-26 Haugwitz Otto High-speed wrapping apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2281111A (en) * 1939-09-23 1942-04-28 Nat Electric Prod Corp Nonmetallic sheath cable
US3037343A (en) * 1957-04-11 1962-06-05 Goodrich Co B F Method and apparatus for manufacturing hose
US2918777A (en) * 1958-11-12 1959-12-29 Goodrich Co B F Hose making apparatus
US3111803A (en) * 1961-07-27 1963-11-26 Haugwitz Otto High-speed wrapping apparatus

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3934395A (en) * 1974-12-19 1976-01-27 Reynolds Metals Company Cable stranding apparatus
US4516394A (en) * 1982-09-07 1985-05-14 Celanese Corporation Yarn package for spiralers
US4607481A (en) * 1982-09-07 1986-08-26 Celanese Corporation Process for spiral wrapping reinforcement filaments
US4555898A (en) * 1983-08-22 1985-12-03 Les Cables De Lyon Apparatus for stranding armor wires about a cable core, and method implemented by the apparatus
US5111646A (en) * 1989-01-03 1992-05-12 Stolberger Maschinenfabrik Gmbh & Co. Kg Tape wrapping device with plural independently rotatable spool carriers
US20030201060A1 (en) * 1999-06-14 2003-10-30 Hauber David Edgar Reinforced thermoplastic pipe manufacture
US20030209312A1 (en) * 1999-06-14 2003-11-13 Hauber David Edgar Reinforced thermoplastic pipe manufacture
US20110167631A1 (en) * 2004-11-23 2011-07-14 Advanced Neuromodulation Systems, Inc. Method for producing a multielectrode lead
US8793869B2 (en) 2004-11-23 2014-08-05 Advanced Neuromodulation Systems, Inc. Method for producing a multielectrode lead
US20080028739A1 (en) * 2004-11-23 2008-02-07 Advanced Neuromodulation Systems, Inc. Method for producing a multielectrode lead
US7698883B2 (en) * 2004-11-23 2010-04-20 Advanced Neuromodulation Systems, Inc. Method for producing a multielectrode lead
US20100193065A1 (en) * 2004-11-23 2010-08-05 Advanced Neuromodulation Systems, Inc. Method for producing a multielectrode lead
US7287366B2 (en) * 2004-11-23 2007-10-30 Advanced Neuromodulation Systems, Inc. Method for producing a multielectrode lead
US7934366B2 (en) * 2004-11-23 2011-05-03 Advanced Neuromodulation Systems, Inc. Method for producing a multielectrode lead
US20060107644A1 (en) * 2004-11-23 2006-05-25 Dye Don L Method for producing a multielectrode lead
US20100300624A1 (en) * 2007-05-18 2010-12-02 Mauro Nava Spiral winding machine with motorized coils
US8079205B2 (en) * 2007-05-18 2011-12-20 O.M.A. S.R.L. Spiral winding machine with motorized coils
ES2307439A2 (es) * 2007-11-26 2008-11-16 Pinter, S.A. Procedimiento y maquina para fabricar hilos recubiertos e hilo recubierto fabricado con el mismo.
WO2009068701A1 (es) * 2007-11-26 2009-06-04 Pinter, S.A. Procedimiento y máquina para fabricar hilos recubiertos, así como hilo recubierto obtenido
ES2307439B1 (es) * 2007-11-26 2009-07-03 Pinter, S.A. Procedimiento y maquina para fabricar hilos recubiertos e hilo recubierto fabricado con el mismo.
US20110072658A1 (en) * 2009-09-30 2011-03-31 Don Dye System and method for fabricating a stimulation lead
US8677619B2 (en) 2009-09-30 2014-03-25 Advanced Neuromodulation Systems, Inc. System and method for fabricating a stimulation lead
US8484841B1 (en) 2010-03-31 2013-07-16 Advanced Neuromodulation Systems, Inc. Method of fabricating a stimulation lead for applying electrical pulses to tissue of a patient
US20190126567A1 (en) * 2016-05-11 2019-05-02 Contitech Mgw Gmbh Method for making a charge air hose
US20240269940A1 (en) * 2021-06-07 2024-08-15 Korea Aerospace Research Institute Fiber winding device

Also Published As

Publication number Publication date
CA955222A (en) 1974-09-24
DE2160867A1 (de) 1972-06-22
FR2116909A5 (fr) 1972-07-21
IT943227B (it) 1973-04-02
GB1343503A (en) 1974-01-10

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