US3572074A - Corrugating methods and apparatus - Google Patents

Corrugating methods and apparatus Download PDF

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Publication number
US3572074A
US3572074A US788779A US3572074DA US3572074A US 3572074 A US3572074 A US 3572074A US 788779 A US788779 A US 788779A US 3572074D A US3572074D A US 3572074DA US 3572074 A US3572074 A US 3572074A
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United States
Prior art keywords
tubing
annular
axis
corrugating member
ridge
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Expired - Lifetime
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US788779A
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English (en)
Inventor
Henry William Holdup
John Alfred Baskwell
Reginald Henry Lush
James Arthur Francis Donelan
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Prysmian Cables and Systems Ltd
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Pirelli General Cable Works
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Publication date
Priority claimed from GB3555268A external-priority patent/GB1219492A/en
Application filed by Pirelli General Cable Works filed Critical Pirelli General Cable Works
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Publication of US3572074A publication Critical patent/US3572074A/en
Assigned to PIRELLI GENERAL PLC., A PUBLIC LIMITED COMPANY reassignment PIRELLI GENERAL PLC., A PUBLIC LIMITED COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PIRELLI UK PLC.
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    • 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
    • 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
    • H01B13/0009—Apparatus or processes specially adapted for manufacturing conductors or cables for forming corrugations on conductors or cables

Definitions

  • an apparatus for producing annular corrugations in metal tubing, such as an electric cable sheath, an apparatus is disclosed which includes an annular corrugating member having a helical-working ridge on its inner circumference and mounted so as to encircle the tubing eccentrically with the working ridge bearing against the tubing.
  • the corrugating member is mounted for free rotation in its own plane within a head which is itself rotatable about the tubing axis so as to move the geometric center of the corrugating member in a circle around the tubing axis.
  • the working ridge bears against successive portions of the tubing to form annular corrugations as the head is rotated and the tubing is moved through the corrugating member.
  • apparatus for corrugating an electric cable sheath by bending it to form a helical trough in its wall, comprising means for supporting the sheath and permitting its movement in the axialdirectionaL'an annular corrugating member-surrounding the sheath and having an internal-working ridge bearing on the exterior'of the sheath, the ring extending in a plane transversely of the sheath at an angle to its axis other than a right angle, and whereof the distance of the nearest point on the working ridge to the axis of the sheath is less than the external radius of the sheath as uncorrugated and the radius of curvature of the ridge is equal to or greater than the external root radius of the sheath after corrugation, and means for moving the sheath in thedir'ection of its axis and for simultaneously producing relative rotation between I the ring and the sheath.
  • the annular corrugating member is mounted in a rotatable head e'ccentrically of the longitudinal axis of a tube in which corrugations are to be formedby said member, the tube being arranged for displacement. along said longitudinal axis through the annular member.
  • the annular member is also tilted at a small angle to the plane perpendicular to this longitudinal axis.
  • the relative diameters of the annular member and tube are such that, on, rotation of the head and displacement of the tube along its longitudinal axis through the annular member, the ridge profile of the annular member bears on and presses in the external surface of the tube over an arc depending interalia upon the degree of eccentricity of the axis of the annular member with respect to the tube axis.
  • the ridged inner profile of the annular member thus creates a corrugation in the external surface of the tube, the contour of the Corrugation depending on the profile of the ridge and the pitch depending on the relative rates of rotation of the annular member and longitudinal displacement of the tube, and the tilt angle.
  • annularly corrugated cable sheaths in particular when the metal is aluminum, have certain advantages over helically corrugated sheaths.
  • annularly corrugated sheath may have superior flexibility to a helically corrugated sheath having the same corrugation profile; the presence of helical corrugations may also give rise to difficulties as regards jointing cable lengths together, or securing end terminals thereto, and
  • Specification No. 711,305 discloses the use of a plurality of synchronously driven gear-toothed rollers disposed in a stationary frame around the circumference of the tubing, each roller having an arcuate periphery embracing a corresponding portion of the tube circumference. On the drawing of the tube through the roller assembly the gear teeth bite into the tubing surface and jointly form an annular corrugation.
  • Specification No, 1,051,429 discloses a considerably more. complex machine, which may be regarded as a development over that of Specification No. 896,163in which a series of working rollers are located in spaced circumferential locations around the rotating head, each roller moreover hearing against the tubing at a series of pressing locations along the tubing axis so that the corrugation depth desired is gradually obtained.
  • annular corrugating member surrounds the tubing and has an internal-working ridge bearing on the exterior of the tubing, and relative movement is effected in the direction of the tubing axis between the tubing and the annular member, simultaneously with relative rotation between the annular member and the tubing, the internal-working ridge being of such curvature and configuration that, on passage of the tubing through the annular member, successive portions of the ridge bear against successive circumferential portions of the tubing in planes perpendicular to the tubing axis to form successive annular troughs in the tubing.
  • the curvatures of the tubing and the tube-engaging surface of the working ridge are of the same hand, as distinct from the arrangements of Specifications Nos. 896,l63 and 1,051,429, in which the working ridge has curvature of opposite hand from that of the tubing. Consequently the ridge and the tubing meet at a lower contact angle; this feature in turn enables both a simplification of the corrugating apparatus and improved corrugating efficiency to be obtained.
  • the present invention also provides apparatus for forming annular corrugations in metal tubing, comprising an annular corrugating member supported so as to surround the tubing and having an internal-working ridge adapted to bear on the exterior of the tubing, means for effecting relative movement in the direction of the tubing axis between the tubing and the annular member, and simultaneously effecting relative rotation between the annular member and the tubing, the internalworking ridge being of such curvature and configuration that, on passage of the tubing through the annular member, successive portions of the ridge, each having a radius of curvature equal to or greater than the external root radius of the tubing after corrugation, bear against the tubing in planes perpendicular to the tubing axis to form successive annular troughs in the tubing.
  • the working ridge is helical.
  • the annular member is mounted eccentrically with respect to the tubing axis.
  • the radius of curvature of the ridge is constant and suitably greater than that of the uncorrugated tubing, according to the degree of eccentricity.
  • the helical-working ridge need extend once only around the corrugating ring. In this case, once the forward end of the working ridge is reached a complete annular corrugation has been formed and the trailing end of the ridge is about to commence formation of the succeeding annular groove. Altematively, if a superior degree of uniformity in the corrugations is required the helical working ridge may continue over one of more further turns, in which case such further turn or turns serve essentially to iron out irregularities created by the first turn.
  • the corrugating annular member is provided with two or more helical-working ridges so as to form two or more annular corrugations simultaneously, or consecutively if each helical-working ridge occupies part only of the circumference of the corrugating member.
  • the present invention provides a considerable advantage over the apparatus of Specifications Nos. 791,513; 791,514 since if multiridged annular members are used in the latter the effect is to increase correspondingly the lead angle of the corrugations and so diminish the eventual flexibility of the tubing.
  • the precise cross section of the helical-working ridge will depend on the shape of the desired corrugation. It will be appreciated, however, that this shape and the ridge cross section must be such that the successive portions of the ridge, as they rise from the valley of the corrugation in which they have been working clear the longitudinally advancing sidewall of the corrugation. A further factor which applies here will be the ratio between the external root radius of the corrugated tubing and the radius of curvature in the plane of the annular member of the working ridge since this in turn affects the time during which the successive working portions'will remain in the indented space between the crest and valley as a whole.
  • the annular member is mounted for rotation around the tubing in a plane perpendicular to the tubing axis, independent driving means being provided for advancing the tubing through the annular member and for rotating the annular member.
  • the efficiency and adaptability of the corrugating method and apparatus can in certain instances be improved if the corrugating annular member is mounted for rotation around the tubing in a plane inclined to the plane perpendicular to the tubing axis at an angle of tilt such that rotation of the annular member induces axial displacement of the tubing relative to the annular member.
  • the pitch angle of the or each helical-working ridge should be less than or equal to the said angle of tilt of the annular member.
  • the corrugating annular member may conveniently be inclined to the tubing axis at an angle within the range 48, usually around 5, but angles outside this range may also be employed, in particular when the annular member has more than one helical-working ridge.
  • the annular member has a left-handed helical-working ridge or ridges and is rotated in an anitclockwise sense viewed from the direction of relative movement of the tubing, the annular member is tilted from the plane perpendicular to the tubing axis in an anticlockwise sense viewed from the direction in which the axis of the annular member is displaced relative to the tubing axis.
  • the annular member has a right-handed helical-working ridge or ridges and is rotated in a clockwise sense viewed from the direction of relative movement of the tubing
  • the annular member is tiled from the plane perpendicular to the tubing axis in a clockwise sense viewed from the direction in which the axis of the annular member is displaced relative to the tubing axis.
  • the annular member is mounted on a rotatable carrier provided with axially adjustable carii means which are effective to adjust the eccentricity of the annular member.
  • FIG. I is an axial cross section of an annular corrugating member employed in one embodiment of the invention.
  • FIG. 2 is an end view of the annular corrugating member shown in FIG. 1;
  • FIG. 3 is a diagrammatic elevation of an apparatus according to the invention employing the corrugating member of FIGS. 1 and 2;
  • FIG. 4 is an end view of an annular corrugating member and cable sheath as employed in another embodiment of the invention.
  • FIG. 5 is a diagrammatic side view of an annularly corrugated sheath formed using the corrugating member shown in FIG. 4, and illustrating the forces acting on the sheath as a result of the relative rotation of the annular member (not shown);
  • FIG. 6 is a diagrammatic perspective view illustrating the operation of an annular corrugating member having a lefthanded helical working ridge
  • FIG. 7 is a diagrammatic perspective view illustrating the operation of an annular corrugating member having a righthanded helical working ridge
  • FIG. 8 is an axial sectional view of part of an apparatus according to the invention employing the corrugating member of FIG. 6, viewed from above;
  • FIG. 9 is an axial sectional view of part of the apparatus of FIG. 8, viewed from one side.
  • FIGS. 1 and 2 illustrate in axial cross section and plane respectively one particular form of annular corrugating member I for use in apparatus in accordance with the present invention, having a helical-working ridge 2 which extends around two complete turns.
  • annular member I can be employed directly in the apparatus shown in Specification No. 791,5I3in substitution of corrugating ring 23.
  • the annular member is not inclined to the tubing axis but instead is disposed at right angles to the tubing axis, that is, with its axis parallel to the tubing axis, in which case no inclined surface need be provided in the mounting block (i.e. 21 in specification No. 791,513) for inclining the annular member I.
  • the helical-working ridge 2 has substantially the same pitch as that required for the eventual annular corrugations of the tubing, the latter being indicated at 3 in broken lines.
  • the annular member 1 is mounted coaxially in a ball race (not shown) which in turn is housed coaxially in a rotatable carrier block.
  • Means, preferably cam means (not shown) are provided for adjusting the eccentricity of the axis of the annular member 1 with respect to the axis of the tubing 3 to effect variation of the depth of corrugation, the tubing 3 itself being supported in guide bushes.
  • the annular member 1 is rotated eccentrically about the axis of the tubing 3 and at the same time the latter is advanced continuously through the member I.
  • Successive parts of the helical-working ridge 2 engage and deform successive parts of the circumference of the tubing 3, the rate of feed of the tubing 3 beingsuch in relation to the rate of rotation of the annular member 1 that the advance of the tubing is maintained in step with the advance of the region of contact of the helical ridge 2 upon rotation of the annular member 1, so that a circumferential annular trough is formed by the ridge 2 in the tubing 3 upon each rotation of the member 1.
  • the leading edge of the ridge 2 finishes one trough the trailing edge of the ridge 2 is just commencing the next trough.
  • the present apparatus When corrugating annularly corrugated tubing in the form of an aluminum sheath for an electric cable the present apparatus, indicated generally at A in FIG. 3, will be positioned immediately in front of an hydraulic extruder 4 from which the cable, comprising a core within an oversize cylindrical cable sheath 3, emerges.
  • FIG. 3 Apparatus enabling the rotational speed of the corrugating member 1 to be correctly synchronized with the variable linear speed of the tubing 3 is illustrated in FIG. 3.
  • the corrugating member 1 is rotated by an electric motor 5 through a fixed speed gearbox 6.
  • the same motor 5 also drives a caterpillar drive unit 7 through a variable speed drive (e.g. a p.i.v. box) 8.
  • Items A, 5, 6, 7, and 8 are rigidly mounted on a trolley 9 which is free to move on wheels 10 in a fixed line parallel tothe movement of sheath 1, on fixed rails 11 on a table 12.
  • the trolley 9 is directly linked to a speed control rheostat or similar device 14 which varies the speed of the motor 5. The effect of this is such that if the trolley 9 moves towards extruder 4 its speed is reduced by the device 14 until it eventually stops completely; alternatively, if the trolley 9 moves away from the extruder 4 the trolley speed is increased up to a certain set limit.
  • the purpose of the caterpillar drive unit 7 is that, before cable sheathing commences, the gearbox-8 is adjusted to give the required ratio between the rotational'speed of the annular member (not shown in FlG.
  • a second corrugating apparatus may be provided, following the first apparatus, in which the corrugating annular member I rotates in opposite direction of rotation to that of the corrugating member 1 in the first apparatus. Consequentially the helical intemal-working ridge 2 in the second member 1 will have to be of opposite hand to that in the first ring.
  • the second corrugating member 1 will not form any additional new corrugations but as the successive portions of the intemal-working ridge 2 bear against the valley and walls of the corrugations already formed by the first annular member 1 a smoothing outeffect will be obtained.
  • powered means are necessary to drive the tubing 3 through the apparatus, the force exerted on the tubing 3 by the working ridge 2 being opposite to the required direction of movement of the tubing 3, indicated by the arrow M in FIG. 1' broken lines).
  • FIG. 6 illustrates diagrammatically the relationship between the direction of rotation R of the annular corrugating member 1, the direction of tubing movement M, and the angle of tilt a of the annular member 1, for a left-handed helical-working ridge 2.
  • the member 1 is rotated relative to the tubing 3 in an unit 7. This ratio is maintained irrespective of changes of motor speed.
  • the sheath 3 initially, or at any time during operation, moves slower than the caterpillar drive unit 7, the latter moves the whole trolley assembly towards the extruder '4 with a consequent reduction in motor speed.
  • the ratio of linear to rotational speed in the apparatus A remains constant and thus the spacing of the resulting annular corrugations remains constant and correctly related to the dimensions of the annular member 1.
  • the axis of the tubing 3 is indicated at C-C', while the axis of the annular member 1 is indicated at D-D': it will be seen that the axis D-D', as well as being inclined at the angle a to the tubing axis CC', is eccentric with respect to the axis C-C', the direction of eccentric displacement being in dicated by the arrow E, so that the helical-working ridge 2 en gages the tubing 3 at a point P at which the ridge 2 lies in a plane perpendicular to the tubing axis C-C' to form a succession of annular troughs 15 in the tubing 3.
  • the axial separation of successive troughs is equal to the pitch of the helical-working ridge 2.
  • the plane of the annular member 1 is tilted through the angle a from the plane perpendicular to the tubing axis in an anticlockwise sense as viewed from the direction 'of eccentric displacement E, a being greater than or equal to the pitch angle of the helical ridge 2.
  • FIG. 7 illustrates the relationship between the direction of rotation R of the annular member 1, the direction of movement of the tubing-3, the direction of eccentric displacement E and the sense of the tilt angle a for an annular corrugating member 1 having a right-handed helical working ridge 2. It will be seen that the member 1 is rotated in a clockwise sense as viewed from the direction of tubing movement M, and that the plane of the member 1 is tilted from the plane perpendicular to the tubing axis C-C' through an angle of a in a clockwise sense as viewed from the direction of eccentric displacement E.
  • FIG. 8 and 9 illustrate a typical practical embodiment of the invention, the two figures being axial sectional views of a tube' corrugating head in two planes at right angles to each other.
  • the tubing 3 (broken lines in FIG. 9) is maintained with its axis C-C' fixed in the desired direction by means of two support bushes 16, 17 which are carried in respective ball bearings l8, 19.
  • the annular member 1, which is of the form illustrated in FIG. 6, is mounted for rotation about its axis D-D' in a ball bearing 20 which is in turn supported in a carrier 21 connected to a rotary head 22, part only of which is shown.
  • the carrier 21 is mounted, with the annular member 1, for transverse sliding movement relative to the head 22 in a plane perpendicular to the axis of rotation of the head 22 (which coincides with the tubing axis C-C')
  • a cam arrangement similar to that described in the apparatus of our specification No. 1,097,709is provided.
  • the head 22 carries two diametrically opposed cam members 23 which have parallel wedgeshaped cam surfaces inclined to the tubing axis C-C'.
  • the cam members 23 are adjustable together in an axial direction to effect radial adjustment of the carrier 21 through cam follower rollers 24 which are captive on an outer cylindrical track on the carrier 21.
  • the cam members 23 are attached to a rotating block (not shown) which is connected through a suitable bearing to an axially adjustable nonrotating sleeve by which axial movement may be transmitted to the block, if necessary while the latter is rotating.
  • the tilting of the plane of the annular member 1 with respect to the plane perpendicular to the tubing axis is determined by parallel wedge-shaped spacers 25 (FIG. 9).
  • Apparatus for forming annular corrugations in metal tubing which comprises means for supporting metal tubing whilst permitting its axial movement, an annular corrugating member, a helical-working ridge formed on the inner surface of the annular corrugating member, a head in which the annular corrugating member is mounted so as to be freely rotatable in its own plane about its geometric center, means in which the head is mounted with the annular corrugating member encircling the tubing with its geometric center displaced from the tubing axis so that the helical-working ridge bears against the tubing and means for rotating the head so that the geometric center of the annular corrugating member moves around the tubing in a circular path in a plane perpendicular to the tubing axis whilst the tubing moves axially through the annular corrugating member and so that successive portions of the working ridge bear against successive circumferential portions of the tubing in planes perpendicular to the tubing axis to form annular corrugations in the
  • annular corrugating member is so mounted in the head that its plane is inclined to the tubing axis but is parallel to the direction in which the geometric center of the annular corrugating member is displaced from the tubing axis, the angle of inclination of the plane of the annular corrugating member to the tubing axis being such that, said movement of the annular corrugating member induces axial movement of the tubing at the required rate relative to the rate of said movement of the annular corrugating member for forming said annular corrugations.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Flexible Shafts (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
US788779A 1968-01-09 1969-01-03 Corrugating methods and apparatus Expired - Lifetime US3572074A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB126668 1968-01-09
GB3555268A GB1219492A (en) 1968-01-09 1968-01-09 Improvements in or relating to corrugating methods and apparatus

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US3572074A true US3572074A (en) 1971-03-23

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US788779A Expired - Lifetime US3572074A (en) 1968-01-09 1969-01-03 Corrugating methods and apparatus

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US (1) US3572074A (enExample)
BE (1) BE726671A (enExample)
DE (1) DE1900953A1 (enExample)
DK (1) DK139256B (enExample)
FR (1) FR2000098A1 (enExample)
NL (1) NL6900355A (enExample)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735616A (en) * 1969-11-27 1973-05-29 Pirelli General Cable Works Method of and apparatus for corrugating tubing
US3788113A (en) * 1970-12-05 1974-01-29 Kabel Metallwerke Ghh Process and apparatus for forming annular corrugations in metal tubing
US3796078A (en) * 1972-10-30 1974-03-12 Torrington Co Apparatus for making spiral corrugations
US4043161A (en) * 1975-11-07 1977-08-23 Astrolab, Inc. Apparatus for forming corrugations of "zero" pitch in coaxial cable
US4435968A (en) 1980-08-02 1984-03-13 Kabel-Und Metallwerke Gutehoffnungshutte Aktiengesellschaft Apparatus for corrugating pipes
EP1088605A3 (en) * 1999-10-01 2002-01-16 Olimpia 80 SRL Process and apparatus for continuous production of corrugated metal pipe with parallel ridges
US20030111768A1 (en) * 2001-12-19 2003-06-19 Thierry Estienne Method of continuously fabricating a corrugated coaxial cable
US20080118595A1 (en) * 2004-10-20 2008-05-22 Hawkes Daniel J Continuous extrusion apparatus
WO2008152350A1 (en) * 2007-06-13 2008-12-18 Bwe Limited Apparatus and method for the production of cable having a core sheathed with an aluminium based sheath
US20100021254A1 (en) * 2005-07-13 2010-01-28 Peter David Jenkins Apparatus and method for forming annular grooves on the outer surface of a cable or tube
US20100307045A1 (en) * 2007-11-02 2010-12-09 Transmission Systems Limited Projectile Weapons
US20110162428A1 (en) * 2007-11-15 2011-07-07 Daniel John Hawkes Continuous extrusion apparatus
US20220176433A1 (en) * 2020-12-03 2022-06-09 Dong-A Flexible Metal Tubes Co., Ltd Corrugated pipe forming apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2804990C2 (de) * 1978-02-06 1985-08-29 kabelmetal electro GmbH, 3000 Hannover Vorrichtung zum kontinuierlichen Wellen dünnwandiger Rohre
US4339936A (en) * 1980-11-03 1982-07-20 Uop Inc. Annular corrugator
US4406142A (en) * 1981-08-31 1983-09-27 Uop Inc. Annular corrugator
RU2147961C1 (ru) * 1998-12-01 2000-04-27 Таганрогский государственный радиотехнический университет Штамп для изготовления гнутых изделий

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US2964090A (en) * 1952-10-17 1960-12-13 Osnabrucker Kupfer Und Drahtwe Tool and apparatus for producing cable sheaths
US3260088A (en) * 1963-09-20 1966-07-12 Raymond Int Inc Apparatus for corrugating metal tubing
US3451242A (en) * 1965-10-27 1969-06-24 Pirelli General Cable Works Apparatus for deforming tubing
US3464250A (en) * 1965-03-02 1969-09-02 Western Electric Co Corrugating apparatus

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Publication number Priority date Publication date Assignee Title
GB711305A (en) * 1952-01-28 1954-06-30 Pirelli General Cable Works Improvements in or relating to electric cables

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2964090A (en) * 1952-10-17 1960-12-13 Osnabrucker Kupfer Und Drahtwe Tool and apparatus for producing cable sheaths
US3260088A (en) * 1963-09-20 1966-07-12 Raymond Int Inc Apparatus for corrugating metal tubing
US3464250A (en) * 1965-03-02 1969-09-02 Western Electric Co Corrugating apparatus
US3451242A (en) * 1965-10-27 1969-06-24 Pirelli General Cable Works Apparatus for deforming tubing

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735616A (en) * 1969-11-27 1973-05-29 Pirelli General Cable Works Method of and apparatus for corrugating tubing
US3788113A (en) * 1970-12-05 1974-01-29 Kabel Metallwerke Ghh Process and apparatus for forming annular corrugations in metal tubing
US3796078A (en) * 1972-10-30 1974-03-12 Torrington Co Apparatus for making spiral corrugations
US4043161A (en) * 1975-11-07 1977-08-23 Astrolab, Inc. Apparatus for forming corrugations of "zero" pitch in coaxial cable
US4435968A (en) 1980-08-02 1984-03-13 Kabel-Und Metallwerke Gutehoffnungshutte Aktiengesellschaft Apparatus for corrugating pipes
EP1088605A3 (en) * 1999-10-01 2002-01-16 Olimpia 80 SRL Process and apparatus for continuous production of corrugated metal pipe with parallel ridges
US20030111768A1 (en) * 2001-12-19 2003-06-19 Thierry Estienne Method of continuously fabricating a corrugated coaxial cable
FR2833746A1 (fr) * 2001-12-19 2003-06-20 Acome Soc Coop Travailleurs Procede de fabrication en continu d'un cable coaxial annele
EP1324354A1 (fr) * 2001-12-19 2003-07-02 Acome Société Cooperative De Travailleurs Procédé de fabrication en continu d'un cable coaxial annelé
US7266886B2 (en) 2001-12-19 2007-09-11 Acome Societe Cooperative De Travailleurs Method of continuously fabricating a corrugated coaxial cable
US20080118595A1 (en) * 2004-10-20 2008-05-22 Hawkes Daniel J Continuous extrusion apparatus
US7980110B2 (en) 2004-10-20 2011-07-19 Bwe Limited Continuous extrusion apparatus
US20100021254A1 (en) * 2005-07-13 2010-01-28 Peter David Jenkins Apparatus and method for forming annular grooves on the outer surface of a cable or tube
US8465235B2 (en) * 2005-07-13 2013-06-18 Miniflex Limited Apparatus and method for forming annular grooves on the outer surface of a cable or tube
US20100163270A1 (en) * 2007-06-13 2010-07-01 Daniel John Hawkes Continuous extrusion apparatus and method for the production of cable having a core sheathed with aluminum based sheath with a continuous extrusion apparatus
WO2008152350A1 (en) * 2007-06-13 2008-12-18 Bwe Limited Apparatus and method for the production of cable having a core sheathed with an aluminium based sheath
CN101663109B (zh) * 2007-06-13 2011-08-10 Bwe有限公司 具有铠装铝基护套心线的电缆的生产设备和方法
US8281634B2 (en) 2007-06-13 2012-10-09 Bwe Limited Continuous extrusion apparatus and method for the production of cable having a core sheathed with aluminum based sheath with a continuous extrusion apparatus
KR101428128B1 (ko) 2007-06-13 2014-08-07 비더블유이 리미티드 알루미늄계 외피로 피복된 코어를 가진 케이블의 생산을 위한 장치 및 방법
US20100307045A1 (en) * 2007-11-02 2010-12-09 Transmission Systems Limited Projectile Weapons
US8291632B2 (en) * 2007-11-02 2012-10-23 Transmission Systems Limited Projectile weapons
US20110162428A1 (en) * 2007-11-15 2011-07-07 Daniel John Hawkes Continuous extrusion apparatus
US8061173B2 (en) 2007-11-15 2011-11-22 Bwe Limited Continuous extrusion apparatus
US20220176433A1 (en) * 2020-12-03 2022-06-09 Dong-A Flexible Metal Tubes Co., Ltd Corrugated pipe forming apparatus
US11648598B2 (en) * 2020-12-03 2023-05-16 Dong-A Flexible Metal Tubes Co., Ltd Corrugated pipe forming apparatus

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Publication number Publication date
DE1900953A1 (de) 1970-02-19
NL6900355A (enExample) 1969-07-11
FR2000098A1 (enExample) 1969-08-29
BE726671A (fr) 1969-06-16
DK139256C (enExample) 1979-06-25
DK139256B (da) 1979-01-22

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