US3769697A - Method and apparatus for the continuous manufacture of a flexible waveguide - Google Patents

Method and apparatus for the continuous manufacture of a flexible waveguide Download PDF

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Publication number
US3769697A
US3769697A US00139633A US3769697DA US3769697A US 3769697 A US3769697 A US 3769697A US 00139633 A US00139633 A US 00139633A US 3769697D A US3769697D A US 3769697DA US 3769697 A US3769697 A US 3769697A
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US
United States
Prior art keywords
helix
sheath
waveguide
support
tape
Prior art date
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Expired - Lifetime
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US00139633A
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English (en)
Inventor
P Priaroggia
A Portinari
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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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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/12—Hollow waveguides
    • H01P3/14—Hollow waveguides flexible
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49016—Antenna or wave energy "plumbing" making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53126—Means to place sheath on running-length core
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/532—Conductor

Definitions

  • waveguides examples of the types of waveguides to which the invention applies are shown and described in our copending application (P-333), filed concurrently herewith and entitled Improved Helical Waveguide.
  • Such waveguides have an internal helix of insulation covered metal which is covered with a layer of insulating or metal tape.
  • A'sheath in the form of a layer'of thermoplastic material is extruded over the layer of tape, and such sheath is normally covered by an armor, such as a layer of wires.
  • the armor is covered by an external protective layer, such as a layer of impregnated jute or a layer of thermoplastic material.
  • said application shows only the use of metal strap for the helix, this invention is equally applicable to the manufacture of helical waveguides having a helix made of a conductor having a different cross-section, e.g. circular.
  • the process in use up to the present time for the manufacture of helical waveguides enables the manufacture of sections of guide having only a limited length of a few meters and which, during installation, have to be connected together using a corresponding number of joints which, even though the connecting operation is carried out with the utmost care, produces points of discontinuity that inevitably lead to losses in transmission of the main wave mode.
  • Such known process comprises winding on a mandrel a helical coil of insulated wire with the turns in good alignment and near to one another and in subsequently covering the resulting helix with a sheath of synthetic resin.
  • the present invention aims at providing a process for the continuous manufacture of flexible helical wave guides, the length of which is limited only by the capacity of the take-up bobbin, so that in an installation the joints are reduced to a minimum and consequently the losses due to discontinuities decreases.
  • the present invention aims at providing a process for the manufacture of a flexible type of helical waveguide, by means of which the helix is formed by winding a conductor on a suitable device, characterized by the fact, that it consists in the continuous formation of this helix while simultaneously moving it along in the direction ofits axis at a speed synchronized with that of the formation of a synthetic resin sheath thereon by extruding the material of the sheath on the advancing helix.
  • a further object of the invention is to provide apparatus designed to carry out the process according to the invention, characterized by the fact that such apparatus comprises: a wire-distributor head on a device designed to receive the helix being formed and to guide it in the direction of its axis, a pressure and pulling device designed to adjust the speed of movement of the helix and synchronize it with the formation speed, and following such-device at least one extrusion head for extruding a sheath on the advancing helix.
  • FIGURE represents diagrammatically a production line including apparatus which permits the process to be carried out according to the invention.
  • the production line and apparatus shown in FIG. 1 comprises a wire-distributor head 10, a device 11 designed to receive the helix being formed and guide it onwards.
  • the device 11 is, for example, a mandrel either fixed or, if desired, rotating on its own axis which extends for length starting with the helical waveguide formation up to a point at which the helix is stabilized.
  • a pressure and waveguide pulling device 12 is arranged around the mandrel 11, and the devicelZ preferably is composed of four drive elements, each including a continuous elastic belt 20 extending around two rollers 21, at least one of which is driven so that the portion of the belt which contacts the helix 24 moves the helix from left to right as viewed in FIG. 1.
  • the number of these drive elements can obviously be different from four or the pulling device 12 could be another conventional pulling device.
  • a lapping head 13 is situated downstream from the device 12 and is followed in order, by an extruder 14 and a cooling bath 15, containing a second pulling device 16 for the adjustment of the axial load on the waveguide.
  • a second pulling device 16 for the adjustment of the axial load on the waveguide.
  • Such device 16 as in the case of pulling device 12, comprises four elements, each comprising an elastic belt 22 moved by at least one ofa pair of rollers 23.
  • the number of elements making up the pulling device 16 could be different from four or the device 16 could be another known type of pulling device.
  • a rotatable bobbin 18 takes up the waveguide 17 at the end of the manufacturing process.
  • the forming head 10 rotates around the mandrel 1 1 and winds on the latter helix-24 of metal strap or wire made of insulated conductive material (for example, enamelled metal strap or copper wire), so that the turns are wound in perfect close relation, one with the other.
  • the head 10 may wind only a single insulated conductor on the mandrel 11 or could wind simultaneously on to the mandrel 11 a plurality of insulated conductors with their turns interposed and in contact in the event that for construction reasons the helices called for a higher winding pitch than that obtained with only one.
  • the helix resulting from the simultaneous winding on to the mandrel 1 l of a plurality of insulated conductors is called a multi-start helix.
  • the multi-start helix could also be obtained by uniting a number of metal straps and subsequently winding the element obtained on the mandrel.
  • the helix 24 on coming out from the forming head 10 is gripped between the elements constituting the pressure and pulling device 12 which, by the belts 20 moved by the rollers 21, force the helix to advance at a speed which is synchronized with that ofthe formation of the helix.
  • the device 12 in addition to being an adjusting unit which enables the advancing speed to be the same as the speed of the helix formation, is also a device which permits the necessary pressure to be applied to the turns of the helix to keep them perfectly adjacent for the whole of their travelling time towards the next production phase of the waveguide.
  • the helix 24 Downstream of the device 12, the helix 24 is immediately covered with a wrapping 25 of tapes made of a suitable material, for example plastic or metallic, by the lapping head 13 rotating round the axis of the helix. As shown in the drawing, the width of the tape 25 is greater than the distance between corresponding points on adjacent turns of the helix 24.
  • thermoplastic resin for example polyethylene or polyvinylchloride.
  • a method for continuously manufacturing a flexible waveguide having an inner wall formed by a helically wound conductor and a tubular sheath of synthetic resin therearound comprising winding a helical conductor into a helix with contacting turns around a support at a first position while simultaneously advancing said helix in the direction of its axis, removing said helix from said support in a direction axially thereof as the helix is formed and advancing and guiding said helix as it is formed to a second position located in said direction with respect to said support while maintaining the turns of the helix in the relation in which they were wound, said advancing, guiding and maintaining being performed by roller means located between said first and second positions, extruding a sheath of synthetic resin around said helix at said second position as it is advanced and synchronizing the rate of winding and advance of said helix as well as the rate of extrusion of the resin of said sheath so that the waveguide is formed continuously with the desired she
  • said waveguide has a layer of plastic tape intermediate said helix and said sheath, said tape having a width greater than the distance between corresponding points on adjacent turns of said helix, said method further comprising wrapping said tape over the turns of said helix intermediate the point of formation of said helix and the extrusion of said sheath therearound, the wrapping of said tape being synchronized with the advance of said helix so that the waveguide is formed continuously.
  • Apparatus for continuously manufacturing a flexible waveguide having an inner wall formed by a helically wound conductor and a tubular sheath of synthetic resin therearound comprising a support for said helix, a wire-distributor head for winding said conductor in a helix with contacting turns around said support, means for feeding said helix from said support in a direction axially of said helix, means in said direction with respect to said head for receiving said helix from said support, for maintaining the turns of said helix in the desired relative positions and for advancing said helix in the direction of the axis thereof at a speed synchronized with the rate at'which said helix is formed, and an extrusion head in said direction with respect to said advancing means for receiving said helix and extruding said sheath thereover as said helix is continuously formed and advanced.
  • Apparatus as set forth in claim 3 further comprising a tape lapping head for wrapping tape on said helix disposed intermediate said advancing means and said extrusion head.

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
US00139633A 1970-05-08 1971-05-03 Method and apparatus for the continuous manufacture of a flexible waveguide Expired - Lifetime US3769697A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2430070 1970-05-08

Publications (1)

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US3769697A true US3769697A (en) 1973-11-06

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Country Status (6)

Country Link
US (1) US3769697A (de)
AU (1) AU2860571A (de)
DE (1) DE2120831A1 (de)
FR (1) FR2088416B1 (de)
GB (1) GB1324724A (de)
ZA (1) ZA712867B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845549A (en) * 1972-03-14 1974-11-05 Pirelli Apparatus and process for the continuous manufacture of a waveguide formed by a cylindrical helix
US3899824A (en) * 1972-07-06 1975-08-19 Phillips Cables Ltd Method and apparatus for sheathing cable cores
US3952407A (en) * 1974-04-25 1976-04-27 Les Cables De Lyon Method for the manufacture of waveguide
US3962781A (en) * 1974-03-29 1976-06-15 Bicc Limited Electromagnetic waveguides
US4017814A (en) * 1974-04-25 1977-04-12 Les Cables De Lyon Wave guide and method for the manufacturing thereof
US4043029A (en) * 1975-01-17 1977-08-23 Societe Anonyme De Telecommunications Waveguide and process for making the same
US4046176A (en) * 1974-08-02 1977-09-06 Etat Francais Winding machine for continuously manufacturing circular waveguides

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530105A (en) * 1945-12-17 1950-11-14 Jr Robert Lee Wallace Method of making a diver's combined hose and electrical communication line cable
GB812032A (en) * 1955-11-30 1959-04-15 Comp Generale Electricite Flexible wave guide
GB887063A (en) * 1957-03-08 1962-01-17 Standard Telephones Cables Ltd Improvements in or relating to guides for electromagnetic waves
GB919074A (en) * 1961-11-17 1963-02-20 Standard Telephones Cables Ltd Waveguides
US3138511A (en) * 1960-05-05 1964-06-23 Teleflex Inc Apparatus for making a flexible conduit of helically wound wires
US3217084A (en) * 1960-12-20 1965-11-09 Anaconda Wire & Cable Co Electric cable having compressed insulation
US3391525A (en) * 1964-01-25 1968-07-09 Ostermann Fa W & M Machine for helically winding material about a flexible tube

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530105A (en) * 1945-12-17 1950-11-14 Jr Robert Lee Wallace Method of making a diver's combined hose and electrical communication line cable
GB812032A (en) * 1955-11-30 1959-04-15 Comp Generale Electricite Flexible wave guide
GB887063A (en) * 1957-03-08 1962-01-17 Standard Telephones Cables Ltd Improvements in or relating to guides for electromagnetic waves
US3138511A (en) * 1960-05-05 1964-06-23 Teleflex Inc Apparatus for making a flexible conduit of helically wound wires
US3217084A (en) * 1960-12-20 1965-11-09 Anaconda Wire & Cable Co Electric cable having compressed insulation
GB919074A (en) * 1961-11-17 1963-02-20 Standard Telephones Cables Ltd Waveguides
US3391525A (en) * 1964-01-25 1968-07-09 Ostermann Fa W & M Machine for helically winding material about a flexible tube

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845549A (en) * 1972-03-14 1974-11-05 Pirelli Apparatus and process for the continuous manufacture of a waveguide formed by a cylindrical helix
US3899824A (en) * 1972-07-06 1975-08-19 Phillips Cables Ltd Method and apparatus for sheathing cable cores
US3962781A (en) * 1974-03-29 1976-06-15 Bicc Limited Electromagnetic waveguides
US3952407A (en) * 1974-04-25 1976-04-27 Les Cables De Lyon Method for the manufacture of waveguide
US4017814A (en) * 1974-04-25 1977-04-12 Les Cables De Lyon Wave guide and method for the manufacturing thereof
US4046176A (en) * 1974-08-02 1977-09-06 Etat Francais Winding machine for continuously manufacturing circular waveguides
US4043029A (en) * 1975-01-17 1977-08-23 Societe Anonyme De Telecommunications Waveguide and process for making the same

Also Published As

Publication number Publication date
AU2860571A (en) 1972-11-09
FR2088416B1 (de) 1974-06-28
DE2120831A1 (de) 1971-12-09
FR2088416A1 (de) 1972-01-07
ZA712867B (en) 1972-09-27
GB1324724A (en) 1973-07-25

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Legal Events

Date Code Title Description
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