US2930007A - Flexible wave-guide tubing - Google Patents

Flexible wave-guide tubing Download PDF

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Publication number
US2930007A
US2930007A US508068A US50806855A US2930007A US 2930007 A US2930007 A US 2930007A US 508068 A US508068 A US 508068A US 50806855 A US50806855 A US 50806855A US 2930007 A US2930007 A US 2930007A
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US
United States
Prior art keywords
tubing
flexible
corrugations
strip
tube
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
US508068A
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English (en)
Inventor
Tore N Anderson
George W Thompson
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.)
Airtron Inc
Original Assignee
Airtron Inc
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
Priority to NL106738D priority Critical patent/NL106738C/xx
Priority to NL207095D priority patent/NL207095A/xx
Application filed by Airtron Inc filed Critical Airtron Inc
Priority to US508068A priority patent/US2930007A/en
Priority to DEA24887A priority patent/DE1118291B/de
Application granted granted Critical
Publication of US2930007A publication Critical patent/US2930007A/en
Anticipated expiration legal-status Critical
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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D15/00—Corrugating tubes
    • B21D15/04—Corrugating tubes transversely, e.g. helically
    • B21D15/06—Corrugating tubes transversely, e.g. helically annularly
    • 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
    • Y10T29/49826—Assembling or joining
    • Y10T29/49893—Peripheral joining of opposed mirror image parts to form a hollow body

Definitions

  • This invention relates to flexible metal tubing useful as wave guides and, more particularly, to such tubing which is formed with transverse corrugations that give it flexibility and at least one longitudinally extending inner ridge that improves microwave propagation.
  • Such tubing has various applications, but is especially useful for electrical wave propagation purposes, particularly as wave guides which interconnect microwave apparatus components.
  • a hollow metal conducting tube which is approximately oblong or rectangular'in cross section.
  • a conducting tube if rigid, is not as well adapted as a flexible tube for use in microwave equipment, as a flexible tube cannhegflexedhtm establish "connections between microwave components which'-may not be in alignment.
  • flexible tubing permits interconnection of components arranged accord ing to compactness without slavish regard for connections.
  • a flexible wave guide of a a given length may be used in various shapes, while each needed shape of rigid wave guide must be specially made to specific form and measurements.
  • flexible wave guides with transverse corrugations provide substantial advantages over a rigid tube; and the relatively small loss in transmission efiiciency of the electrical waves, due to the irregularities or corrugations of the inner walls of the wave guide, is more than oflEset by the advantages of flexibility.
  • This invention may readily be distinguished from that disclosed in the application of David Ingalls, Serial No. 402,693, which was filed January 7, 1954, now Patent No. 2,840,897, issued July 1, 1958, and assigned to the assignee of the present invention.
  • the two inventions deal with flexible metal tubing, but the constructions are different and the methods of fabrication are different.
  • An important improvement of the present invention resides in the provision of one or more re-entrant ridges in the wave guide as formed,,this being for better microwave propagation. These ridges serve to broaden the band of frequencies which may be efficiently propagated.
  • an important object of this invention isto provide flexible tubing which is fabricated with at least one re-entrant ridge formation for the purpose of improving its microwave propagation characteristics when used as a wave guide.
  • Another object is to provide a flexible wave guide in which there are transverse corrugations formed with one or more re-entrant ridges, these ridges being so dimensioned and so disposed as to enable its use for the propagation of microwaves with greatly increased useful band width, but without increasing the overall dimensions of the tube itself.
  • Rigid wave guides having longitudinal ridges are not new, but it is believed that the combination, in a tubular, flexible wave guide, of transverse corrugations to give Patented Mar. 22, 1960 2 fiexiblity and one or more re-entrant longitudinal ridges to give broader band-width transmission, is new.
  • Fig. l is a fragmentary top plan view of the outer side of a transversely corrugated and longitudinally ridged strip of relatively thin, bendable, conductive metal to be used in assembly with a mating strip to form a finished length of metal tubing having one or more, longitudinal re-entrant'ridges, the said strip being generally U-shapedintransverse section.
  • a p v Fig. 2 is a plan view of such a metal strip as it appears during the, process of fabrication by progressive step-wise advancement through a series of forming dies.
  • Fig. 3 is a side elevational view of said strip as seen fromthetopofFigZ. I
  • Fig. 4 is an enlarged, transverseSectional-wiew of the strip shown in Fig. 1.
  • Fig. 6 is a transverse sectional view showing how two strips formed with transverse-corrugations may be assembled with the folds of their corrugations in nesting inter-relationship.
  • Fig. 7 is a reduced-scale, cross-sectional view of the parts shown in Fig. 6, after said parts have been brought together in nesting interrelationship.
  • Fig. 8 is a view of the same character as Fig. 7, but illustrating a modified form of ridged, flexible tubing.
  • the raw.material from which wave-guide tubing is fabricated is a flat, thin strip 1 of bendable conductive metal of any desired length.
  • This strip preferably, is fed progressively through a series of reciprocating forming dies. Dies which would operate in a rolling process might be used, but the use of reciprocating dies has certain advantages, particularly in the bending of the strip material around corners so as to give it a U-shaped configuration. Therefore, the strip is advanced step-wise between pairs of such reciprocating dies and the feeding of the strip is automatically regulated so that the formation of the corrugations will be uniform and appear continuous.
  • Fig. 1 shows in plan view the appearance of the U- shaped metal strip after its formation has been completed, that is, after it has passed through all of the dies.
  • Figs. 2 and 3 show the appearance of a metal strip 1 during processing.
  • the strip material progresses from right to left and from the first stage c through successive stages d, e, f, g and h.
  • stages d, e, f, g and h At stage 0 a re-entrant ridge 2 is formed.
  • stage d the corrugations are formed with ctional view ..ofJhe corru:,
  • Fig. 5 is an enlarged cross section through the side walls of the completely formed corrugated strip 1.
  • the outer surfaces of the side walls of each outwardly extending corrugation at the right side of Fig. 5 are spaced apart by the distance'a, and on the left side of. this figure the inner surfaces of said walls of gether.
  • This-operational step is not novel, but. is conventional, and may be performed either before or after removal of the mandrel, if a mandrel has been employed.
  • corrugated ridged tubing produced according to the above-described method and conforming to the tubing shown in cross section in Fig. 7,
  • the folds of two mating strips may be assembled with their edges in overlapping relationship, or with an edge of one piece somewhat telescoped with respect to an edge of the other piece, the enlarged 'end portions of the folds of one piece must be brought into” overlapping relationship to the reduced end portions of the folds of the other-piece.
  • the two pieces will then fit together with a satisfactory friction fit, thereby forming a two-piece tubing such as is shown in 7 in cross section.
  • This method of assembly is shown in Fig. 6, where, in section, the upper piece is first displaced to the right side of the lower piece.
  • the two pieces are brought together by relative side-to-side translational movement with the enlarged folds on the left side of the lower piece overlapping the reduced folds on the left side of the upper piece. correspondingly, the reduced folds on the right side of the lower piece are nested within the enlarged folds on the right side of the upper piece.
  • a two-piece mandrel is found to be useful in assembling the two halves of the flexible tube, since it facili degree of overlap of the mating edges.
  • the two parts fo the mandrel may be slightly tapered and in superposed relationship, so that the small end of one part underlies and is opposed to the large end of the other part.
  • the vertical dimension of the two mandrel parts, when assembled to function as a mandrel between the two U-shaped strips, should be the same as dimension X indicated on Fig. 6, and said mandrel parts should be longitudinally recessed to accommodate ridges 2 and to permit the hereinbefore described relative movement of the two U-shaped strips 1 while the mandrel remains in place.
  • this method of fabrication provides a finished product which is in no way inferior to a one-piece tube, the convolutions of which are conventionally spiral-wound. But it is not easy to conceive how a ridged wave guide, as shown herein, could be fabricated by the spiral winding process. It is not believed that such a process would be practical or even possible.
  • this tubing when intended for useas a wave guide and possibly for other uses, is preferably protectively jacketed with relatively soft, rubber or rubber-like insulating material, bonded as by molding or otherwise about the metal tube.
  • the corrugated flexible tubing shall be formed with unlike mating portions, only one of which would be formed with a re-entrant ridge as shown in Fig. 8.
  • the forming dies to be used for producing one of the mating strips must, of course, be different from the dies used for producing the other of the mating strips.
  • the method in other respects, would be as hereinbefore described.
  • the re-entrant ridge extending linearly of the tube, provides an extended rangeof band-width for efficient transmission of waves of different frequencies. The advantages of this construction will, therefore, be apparent.
  • Flexible, metal, waveguide tubing of generally rectangular shape in cross section, comprising opposed, U-shaped, elongate parts, joined along their edges to constitute a tube, said parts having transverse corrugations, inter-nesting at said junctures; each of said corrugations extending continuously about said tube, and one of said parts having an inner corrugated ridge extending longitudinally thereof midway between said one parts edges.
  • Flexible, metal, wave-guide tubing of generally rectangular shape in cross section, comprising opposed,
  • U-shaped, elongate parts joined along their edges to constitute a tube, said parts having transverse corrugations, inter-nesting at said junctures; each of said corrugations extending continuously about said tube, and each of said parts having an inner corrugated ridge extending longitudinally thereof midway between said parts, edges.
  • Flexible, meta, wave-guide tubing of generally rectangular shape in cross section having two opposite sides of greater width than the other two opposite sides of the tubing, all said sides having transverse corrugations rendering the tubing flexible, and each of said sides of greater width having an inner ridge extending longitudinally and centrally thereof; said ridges being spaced from each other having transverse corrugations continuous with the transverse corrugations of the sides of said tubing, said ridges and the corrugations thereof imparting a transverse rigidity to each of said 'sides of greater width to maintain substantially constant the cross-sectional configuration and area of said tubing when said tubing is flexed by a force applied normal to the axis thereof.
  • Flexible, metal, waveguide tubing of generally rectangular shape in cross section having two opposite sides of greater width than the other two opposite sides of the tubing, all said sides having transverse corrugations rendering the tubing flexible and one of the sides of greater width having a substantially rectangular inner ridge extending longitudinally and centrally thereof, said ridge having transverse corrugations continuous with the 6 transverse corrugations of the sides of said tubing, said ridge'and the corrugations thereof imparting a transverse rigidity to said one side to maintain substantially constantthe cross-sectional configuration .and areaof said tubing when said tubing is flexed by a force applied normal to the axis thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Waveguides (AREA)
US508068A 1955-05-13 1955-05-13 Flexible wave-guide tubing Expired - Lifetime US2930007A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL106738D NL106738C (enExample) 1955-05-13
NL207095D NL207095A (enExample) 1955-05-13
US508068A US2930007A (en) 1955-05-13 1955-05-13 Flexible wave-guide tubing
DEA24887A DE1118291B (de) 1955-05-13 1956-05-12 Steghohlleiter zur UEbertragung magnetischer Hohlrohrwellen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US508068A US2930007A (en) 1955-05-13 1955-05-13 Flexible wave-guide tubing

Publications (1)

Publication Number Publication Date
US2930007A true US2930007A (en) 1960-03-22

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US (1) US2930007A (enExample)
DE (1) DE1118291B (enExample)
NL (2) NL207095A (enExample)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048913A (en) * 1958-10-10 1962-08-14 Jr Arthur G Ball Method of precisely joining waveguide cross-sections
US3090019A (en) * 1959-02-24 1963-05-14 Andrew Corp Flexible waveguide
US3315184A (en) * 1962-06-11 1967-04-18 Hallicrafters Co Flexible connector
US3813765A (en) * 1971-05-21 1974-06-04 Kabel Metallwerke Ghh Method of manufacturing tubular electromagnetic wave guides
USD307790S (en) 1985-09-13 1990-05-08 Oyuponor AB Tube or the like
US20050126094A1 (en) * 2002-07-05 2005-06-16 Mirai Industry Co., Ltd. Storage member for long material and method of manufacturing the storage member
US20140027002A1 (en) * 2011-04-04 2014-01-30 Yazaki Corporation Corrugated tube
US20140261842A1 (en) * 2013-03-12 2014-09-18 Sjm Co., Ltd. Flexible tube for exhaust pipe of automobiles
US11384870B2 (en) * 2009-12-30 2022-07-12 Globalmed, Inc. Tapered stress-relieved helically reinforced hose

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US889745A (en) * 1905-09-06 1908-06-02 Fred S Beach Knockdown culvert.
US1268745A (en) * 1917-02-12 1918-06-04 Charles E Martin Bending corrugated material.
US2067282A (en) * 1934-08-01 1937-01-12 Joseph E Padgett Method of making joint members
US2374498A (en) * 1941-07-10 1945-04-24 British Insulated Cables Ltd Guide for the transmission of electric waves
CA467912A (en) * 1950-09-05 James Bingley Frank Devices for interconnecting wave guides
US2540141A (en) * 1946-03-06 1951-02-06 Armco Steel Corp Longitudinal seam for corrugated metal pipe for light duty tunnel liners
US2556187A (en) * 1949-07-08 1951-06-12 Airtron Inc Flexible waveguide with spaced conducting sections and method of making the same
US2563578A (en) * 1951-08-07 Flexible corrugated seamless metal
US2600169A (en) * 1947-05-31 1952-06-10 Coop Ind Inc Flexible wave guide matching section
US2632805A (en) * 1949-07-23 1953-03-24 Westinghouse Electric Corp Re-entrant wave guide coupling device
US2657329A (en) * 1950-02-21 1953-10-27 Sperry Corp Traveling wave tube
US2708307A (en) * 1952-07-29 1955-05-17 Dresser Ind Method of making a split pipe sleeve

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE695568C (de) * 1935-08-17 1940-08-28 Wilhelm Peuthert Rohrbogen-Dehnungsausgleicher
DE749650C (de) * 1938-05-12 1944-11-29 Verfahren zur Herstellung von biegsamen Hochfrequenzleitungen
DE728421C (de) * 1938-10-05 1942-11-26 Erich Holz Verfahren zur Herstellung von biegsamen Hochfrequenzleitungen
DE737082C (de) * 1939-09-24 1943-07-05 Siemens Ag Verfahren zur Herstellung abgeschirmter bzw. konzentrischer Leitungen, insbesondere kapazitaetsarmer Antennenzuleitungen
DE894860C (de) * 1944-12-20 1953-10-29 Aeg Verfahren zur Herstellung von biegsamen Hohlrohrleitungen, insbesondere fuer Hochfrequenzkabel
US2452125A (en) * 1945-06-12 1948-10-26 Titeflex Inc Method of forming and changing the cross section of convoluted metal tubing
FR1062123A (fr) * 1952-08-19 1954-04-20 Armco Int Corp Conduite métallique ondulée souple et emboîtable et son procédé de fabrication

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA467912A (en) * 1950-09-05 James Bingley Frank Devices for interconnecting wave guides
US2563578A (en) * 1951-08-07 Flexible corrugated seamless metal
US889745A (en) * 1905-09-06 1908-06-02 Fred S Beach Knockdown culvert.
US1268745A (en) * 1917-02-12 1918-06-04 Charles E Martin Bending corrugated material.
US2067282A (en) * 1934-08-01 1937-01-12 Joseph E Padgett Method of making joint members
US2374498A (en) * 1941-07-10 1945-04-24 British Insulated Cables Ltd Guide for the transmission of electric waves
US2540141A (en) * 1946-03-06 1951-02-06 Armco Steel Corp Longitudinal seam for corrugated metal pipe for light duty tunnel liners
US2600169A (en) * 1947-05-31 1952-06-10 Coop Ind Inc Flexible wave guide matching section
US2556187A (en) * 1949-07-08 1951-06-12 Airtron Inc Flexible waveguide with spaced conducting sections and method of making the same
US2632805A (en) * 1949-07-23 1953-03-24 Westinghouse Electric Corp Re-entrant wave guide coupling device
US2657329A (en) * 1950-02-21 1953-10-27 Sperry Corp Traveling wave tube
US2708307A (en) * 1952-07-29 1955-05-17 Dresser Ind Method of making a split pipe sleeve

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048913A (en) * 1958-10-10 1962-08-14 Jr Arthur G Ball Method of precisely joining waveguide cross-sections
US3090019A (en) * 1959-02-24 1963-05-14 Andrew Corp Flexible waveguide
US3315184A (en) * 1962-06-11 1967-04-18 Hallicrafters Co Flexible connector
US3813765A (en) * 1971-05-21 1974-06-04 Kabel Metallwerke Ghh Method of manufacturing tubular electromagnetic wave guides
USD307790S (en) 1985-09-13 1990-05-08 Oyuponor AB Tube or the like
US20050126094A1 (en) * 2002-07-05 2005-06-16 Mirai Industry Co., Ltd. Storage member for long material and method of manufacturing the storage member
US11384870B2 (en) * 2009-12-30 2022-07-12 Globalmed, Inc. Tapered stress-relieved helically reinforced hose
US20140027002A1 (en) * 2011-04-04 2014-01-30 Yazaki Corporation Corrugated tube
US9163756B2 (en) * 2011-04-04 2015-10-20 Yazaki Corporation Corrugated tube
US20140261842A1 (en) * 2013-03-12 2014-09-18 Sjm Co., Ltd. Flexible tube for exhaust pipe of automobiles
US9181846B2 (en) * 2013-03-12 2015-11-10 Sjm Co., Ltd. Flexible tube for exhaust pipe of automobiles

Also Published As

Publication number Publication date
NL207095A (enExample)
NL106738C (enExample)
DE1118291B (de) 1961-11-30

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