US3602030A - Method and apparatus for producing tapered tube - Google Patents

Method and apparatus for producing tapered tube Download PDF

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Publication number
US3602030A
US3602030A US771515A US3602030DA US3602030A US 3602030 A US3602030 A US 3602030A US 771515 A US771515 A US 771515A US 3602030D A US3602030D A US 3602030DA US 3602030 A US3602030 A US 3602030A
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United States
Prior art keywords
tapered
die
tube
core
tube blank
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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
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US771515A
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English (en)
Inventor
Yoshio Noda
Hiromichi Sugiura
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.)
Nippon Gakki Co Ltd
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Nippon Gakki Co Ltd
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Priority claimed from JP756868A external-priority patent/JPS4914066B1/ja
Application filed by Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/16—Making tubes with varying diameter in longitudinal direction
    • B21C37/18—Making tubes with varying diameter in longitudinal direction conical tubes

Definitions

  • Herbst Attorney-Stanley Vyplder ABSTRACT A production method of tapered tube comprising the steps of passing a tube blank made of a metal over the surface of a tapered core; placing on the outer surface of said tube blank a die consisting of a material having a plasticity and elasticity, but the resistivity thereof against the plastic deformation being higher than that of said tube blank, and having an inner bore of substantially equal diameter to that of the narrower end of said tapered core; shifting said tapered core and said die against each other so that the die is conveyed from one end to the other end of the tapered core; and forming said tube blank into a tapered tube in accordance with the surface of said tapered core.
  • This invention relates to a method and apparatus to be used in the production of tapered tubes, and more particularly to the type wherein seamless tube blank is placed over a tapered I core of a desired shape, and both the blank and the tapered core are thereafter passed a die plastically deformable, whereby the tube blank is formed into a tapered tube having the same configuration as the tapered core.
  • Swagging method in which a metallic mold divided into upper and lower halves are prepared in a press machine, the tube blank is rotatingly inserted inside of the mold, and the pressing machine is operated so that the tube is formed into a desired configuration between the upper and lower mold halves.
  • Pressurizing method such as bulge forming by employing a liquid pressure, or as explosion forming utilizing high energy and high speed at the time of explosion.
  • the thickness of the products tends to be thicker at the portion thereof having smaller diameter and thinner at the portions having larger diameter, and the methods also have difficulties in obtaining high precision products.
  • the surface of the products is apt to be rough, and the smoothening thereof requires a considerable amount of additional labor.
  • unequality of the thickness is the one which should be most obviated in the application for the wind musical instruments, because in the thin thickness tapered tube utilized in the musical instruments, the unequality causes not only the difference in the tone color and timbre but also in the tone pitch and the tone volume of the instrument.
  • the above described conventional production methods of the tapered tube with their inherent difficulty in obtaining uniformity in the thickness, have been found to be utterly unprofitable when they are used in the production of such tubes.
  • the primary object of the present invention is to provide a unique production method and the apparatus for carrying out such method, in which no complicated process is required and the tapered tube of uniform thickness is thereby produced with high precision without accompanying the difficulties encountered in the conventional methods.
  • Another object of the present invention is to provide a novel method, wherein the tapered tube having uniform thickness is easily obtained by one step or repetition of the similar steps with the use of a simple device.
  • Still another object of the present invention is to provide a novel production method of the tapered tube, which is not only applicable to a straight tapered tube having the diameter LII monotonously varies, but also to a mildly curved tube wherein the increasing rate of the diameter is always positive and the centerline thereof is in a plane, so that the product is easily taken out of the core member after the completion of the production process.
  • Further object of the present invention is to provide a novel production apparatus which comprises: a movable plate which is shiftable horizontally in unison with the driving shaft operable in one direction; a fixed plate provided in a position opposing to said movable plate and having a dieholder at the central portion thereof; a core member having a taper and connected with said movable plate so that the member is made movable through said dieholder supported by said fixed plate; and a die having a larger resistivity against the plastic deformation than that of the tube blank to be worked, and the inner diameter thereof is plastically deformed when the core member and the blank are moved through the die; and also to provide a device which automatically takes out the products drawn along the tapered core member by the action of a self-closing catching means at the time the core member retracts from its operating position.
  • the above-described objects are accomplished by the provision of a core member of a desired shape having a tapered surface at a suitable angle and a die which is made of a material having plasticity and elasticity and the resistivity against the plastic deformation is larger than that of the tube blank.
  • the tube blank to be worked by these members may consist of any metal and the end of the blank fitted with the narrower end of the core member should be folded back to inside so that the blank is firmly held by the core member placed therein.
  • the blank firmly held at one end by said core member is forcibly passed through the die having an inner bore approximately equal to the diameter of the narrower end of the core member, starting at first from the narrower end, and the tube blank is drawn along the tapered surface of the core member by the compressive force exerted from the inner bore of the die while the blank and the die are relatively shifted in the horizontal direction one against the other.
  • the movable plate which is horizontally shifted together with the core member and the tube blank is driven by a driving shaft (hereinafter called threaded shaft) which is shifted without rotation by a driving member rotated by a chain around the threaded shaft, said chain being driven by a motor, whereby the movable plate is slidingly shifted on a pair of horizontally extended tierods between said fixed plate and a pair of supporting plates which are also standing in parallel on the base plate.
  • the movable plate is somewhat loosely coupled with the core member through a coupling means, and the core member is thereby pulled slowly through the die starting at first from the narrower end, so that the tube blank is drawn into a tapered tube between the die and the tapered core member.
  • the die is made of a material having plasticity and elasticity such as soft iron, brass, aluminum, lead, and polyurethane, and the shape thereof may be selected suitably. However, in usual case, it is formed into a disclike configuration having comparatively less thickness, the outside diameter of which is so determined that some remaining portion not received any plastic deformation is left after the completion of the drawing operation, and the inner diameter of the bore is determined at first approximately equal to the diameter of the narrower end, i.e. smaller diameter end of the core member.
  • the dieholder may be attached to the fixed plate either stationary or movably depending on the shape of the tapered tube to be produced. That is, the stationary dieholder is used for the production of the straight line tapered tube, and the movable dieholder is employed for the production of the curved tapered tube which has a curved center line.
  • the production method of the tapered tube according to the present invention utilizes a tapered core and a die having plasticity and elasticity for the drawing of the tube blank, the features as described hereinafter can be obtained:
  • the tapered tube thereby produced is not limited to those having circular cross sections, but also the tapered tube having polygonal or elliptical cross sections can be obtained by the use of similar and single process.
  • the tapered tube having the center line slightly curved also can be produced easily.
  • the distribution of the thickness of the tapered tube can be made into surprisingly uniform, and the precision of the products also can be remarkably enhanced because of its tight fitting nature on the surface of the core.
  • the angle of the dieholder can be automatically regulated so that it is always maintained at right angle against the centerline of the core, whereby the curved tube can be automatically produced as in the case of the straight line tapered tube.
  • FIG. 1 is a cross-sectional plan view of the principal part of the apparatus according to the present invention at the time of the tapered tube being produced.
  • FIGS. 2A and 2B are perspective views of a die showing the conditions of before and afterward of its operation.
  • F IGS. 3A, 3B and 3C are cross-sectional profile views of the principal part of the apparatus according to the present invention, each of the views showing the relative conditions of the blank, core, and the die before the initiation of the drawing operation in each step when the production of the tapered tube is performed in three steps.
  • FIG. 4 is a cross-sectional profile view of the tapered tube
  • FIG. 7 is a similar crosssectional view of the principal part of the apparatus for drawing a curved tapered tube, which constitutes another embodiment of the present invention.
  • FIG. 8 is a perspective view showing the coupling relation between the core and the movable plate.
  • FIG. 9 is a longitudinal cross-sectional view of the core and the movable plate in their coupled condition.
  • FIG. 10 is a perspective view of the dieholder which is utilized in producing the curved tapered tube according to another embodiment of the present invention.
  • FIG. 11 is a longitudinal cross-sectional profile view of the apparatus, showing the principal part only, at the time the tapered tube is drawn.
  • FIG. 12 is a longitudinal cross-sectional profile view of the apparatus, showing the principal part only, at the time of thus produced tapered tube is removed from the apparatus, and
  • FIG. 13 is a front view of a releasing device of the product out of the core member.
  • a tapered core I made of a metal such as SK having high rigidity with its surface treated by heat, and on one of the narrower end 2 (of smaller diameter) thereof a threaded hole 3 is provided.
  • a threaded hole 3 is provided on the movable plate 6.
  • an intermediate rod 4 On one end of the intermediate rod 4, a threaded projecting portion3a is provided and this engages with the threaded hole 3 of the tapered core.
  • the other end of the intermediate rod 4 is enlarged into a coupling frange 5 which engages with the coupling jaw 7 fitted on the movable plate 1 driven by a driving mechanism.
  • a die 8 is made of a material such as soft iron, brass, aluminum, lead, polyurethane, or the like having a plasticity and elasticity, and although the die 8 is shown as a comparatively thin disc, it may be of any desired shape adapted to its own 1 material and the drawing condition of the tube blank.
  • the size of the die 8 should be determined in such a manner that the inner diameter 9 thereof is approximately equal to that of the narrower end of the tapered core 1, and the outside diameter of the die 8 is much larger than the wider end of the tapered core I so that some portion of the die 8 is left without subjected to the plastic deformation even at the last stage of the drawing operation.
  • the peripheral area of the inner bore 9 of the die 8 is slightly chamfered or contracted. However, if the die 8 is of a planar configuration, the inner bore may be punched out and the deformation thereby caused around the punched bore may be utilized in the drawing step following thereafter.
  • the die 8 at the initial condition is shown in FIG. 2a and the same at the completion of the drawing step is shown in FIG. 2b.
  • Numeral 10 designates a dieholder having an inside bore 1 l of enough large diameter, and the die 8 is supported inside of a diameter which is approximately equal to the maximum inside diameter of the desired tube, and one end of the tube blank 14 is folded back inwardly so that this portion of the blank can be seized on the narrower end 2 of the tapered core 1.
  • the tube blank 14 is slipped over the tapered core I having been prepared beforehand, as shown in FIG. 1, so that the one end of the tube blank 14 is held against the narrower end 2 of the tapered core 1, and at the same time seized between the end face of the intermediate rod 4 which couples the tapered core 1 to the movable plate 6 and the narrower end 2 of the core I.
  • the die 8 stationary supported by the dieholder l0 acts on the tube blank 14 as if the die 8 moves over the outside of the tube blank 14. Since in this case, the inside diameter of the bore 9 of the die 8 is so determined as itis less than the outside diameter of the tube blank 14, the tube blank 14 is subjected to a strong plastic deformation resistance force of the die 8 and collapsed to be brought to contact with the tapered core 1. However, the compressive'force of the die 8 cannot overcome the strong rigidity of the core 1 and the inner bore 9 of the die 8 is also deformed to be enlarged.
  • FIGS. 3A, 3B, 3C Such aprocedure is illustrated in FIGS. 3A, 3B, 3C wherein each of the steps indicated by A, B, C, is provided for obtaining a steep tapered tube indicated in FIG. 41.
  • the tapered cores 1, 1a, 1b utilized in these steps have their tapers different between each other by a definite ratio, and the diameters of the inner bores 9, 9a, 9b of the dies 8, 8a, db are also different between each other corresponding to the dimensions of the tapered cores 1, 1a, 1b.
  • an ordinary lubricating agent to be used in the drawing procedure of higher viscosity should be employed to prevent a seizure caused by the fusion of the contacting materials.
  • the die 8 used in each of the steps is deformed and expanded its diameter during its drawing procedure, and for this reason, the die 8 will not damage the product tube even when the core 1 and the product tube are shifted to rightward for delivering after the completion of the tube.
  • the die 8 may be discarded after each drawing operation. How ever, some of the die made of polyurethane and utilizing only its elasticity may be used repeatedly.
  • FIGS. 5 and 6 illustrate an apparatus embodied to the extent adaptable to the practical use.
  • a pair of tierods 18 are extended horizontally.
  • Numeral 6 designates a movable plate supported between these tierods 18 so that is is freely slidable in the longitudinal direction of the apparatus.
  • This threaded shaft 19 has a driving member 20 mounted thereon freely rotatably and supported between the above described a pair of supporting plates 17.
  • the driving member 20 is rotated around the threaded shaft 19, and due to the thread cut inside of the driving member 20 and engaging with the threaded shaft I9, the-driving member can shift the movable plate 6 together with the threaded shaft 19 and forth along the tierod I8.
  • an intermediate rod 4 provided at the narrower end of the tapered core 1 is attached to the coupling jaw 7 through a pin 23, whereby the tapered core 1 is shifted along the longitudinal direction of the apparatus together with the movable plate 6.
  • a inner ring 26 having a convexed outer surface 25 which is concentric with the inner surface 24 of the fixed plate 13, and a dieholder It) attached with a die 8 is mounted inside of the inner ring 26.
  • balls or rollers 27 inserted between retainer rings so that the inner ring 26 is freely rotatable within the inner surface 24 of the fixed plate 13, and the die 8 is always maintained rectangular to the part of the curved center line X)( of the core ll located at the center of the fixed plate 113.
  • so-called universal joint wherein a ring 29 is supported between the inner edges of the fixed plate 13 through a pair of vertically extending shafts 28 so that the ring 29 is freely rotatably around the vertical axis, and another ring 31 likewise supported by a pair of horizontally extending shafts 30 so that it is freely rotatably around the shafts 30.
  • the die 8 is fixed on the second ring 31 and functions in the similar manner as described above.
  • the coupling between the coupling jaw 7 and the intermediate rod 4 may be otherwise obtained than with the pin 23, but through a construction of these coupling members in which the coupling jaw 7 is provided with a projected receiving plate 33 having a recessed portion 32, and on the other hand, a neck portion 34, is provided on one end of the intermediate rod 4, whereby the neck portion is inserted into the recessed portion 32, as shown in FIGS. 8 and 9.
  • the neck portion 34 may be so arranged that it engages with a similarly recessed portion 35 of a coupling plate 36 inserted inside of the receiving plate 33 in such a manner that the coupling plate 36 is somewhat movable in the vertical direction.
  • the intermediate rod ll can be coupled with the movable plate 6 with an allowance somewhat movable in the vertical direction.
  • the above-described apparatus for producing tapered tubes operates as follows:
  • the movable plate 6 coupled with the tapered core 1 and the tube blank 14 is shifted together with the threaded shaft 19 along the tierods l8 and pulls the tapered core 1 and the tube blank l4 thereon through the die 8.
  • the die attached to the dieholder 10 acts on the tube blank 14 while these two members are moved each other, and the tube blank M is thereby subjected to a strong compressive force from the periphery of the inner bore 9 of the die b which is smaller than the outside diameter of the tube blank M.
  • the tube blank is thus plastically deformed and brought to contact with the surface of the tapered core ll, whereby the desired tapered tube is produced.
  • FIGS. Ill and I2 illustrate another embodiment of the apparatus according to the present invention in which only the principal parts thereof are shown and an automatic products releasing device is provided.
  • FIG. Ill showing the embodiment at the time the tube blank is being drawn, it is seen that the larger end of the tapered core 1, instead of the narrower end thereof, is this time coupled to the movable plate 6 (not shown through the coupling member 7 and the intermediate rod 4 (these'are also not shown) so that the larger end 20 of the tapered core 1 is placed inward of the fixed plate 13.
  • the narrower end 2 of the tapered core is now extended through a working potion 27 provided at the center of the fixed plate 13.
  • the above described working portion 37 is constituted from a die 8 attached on a dieholder l and a product removing device 38 self-closing and provided at the outward side (righthand side in FIG. 11 and 12) of the dieholder 10.
  • the removing device 38 is in itself a removing element, as shown in FIG. 13, which consists of, for instance, a pair of sectors 39 and a pair of coiled springs 40 extended across the sectors 39 so that the sectors may be expanded outwardly but close inwardly when released.
  • Such sectors 39 can be obtained by dividing a disc having an inner bore 42 insertable around the peripheral surface of the tapered core 1, and by disposing thus obtained sectors opposingly along the divided edges.
  • the pair of sectors 39 are further connected together by means of a pin 41 located at one side of the inner bore 42 and extended in axial direction from the 'dieholder 10, so that the pair of sectors 39 may be swung open around the pin 41 against the contracting force of the coiled springs 40 by means of an expanded force exerted from the peripheral surface of the tapered core 1 which is inserted inside of the inner bore 42 of the pair of the sectors 39.
  • a method of producing a tapered tube comprising the steps of positioning a tapered core within a metal tube blank and relatively advancing along and in engagement with the outer face of 5 said core engaging tube from the tapered toward the opposite end of said core,.a die of substantially uniform thickness and having substantially parallel front and rear faces facing respectively the direction of advance of said die and the opposite direction thereto and provided with a central aperture of approximately the diameter of the tapered end portion of said core and formed of an elastic plastic material having a plastic deformation resistivity higher than that of said tube blank to axially inwardly rearwardly flare the section of said die bordering said aperture with the advance of said die and effect the bearing of the front face of said die flared portion on said tube blank whereby said tube blank is formed by said advancing die to a shape corresponding to the v outer surface of said core.
  • Examplel Material of the tube blank 1 BEST 1 AgT Thickness of the tube blank, min 0. 5 0. 4 I.D./0.D. of the blank, mm. 34/35 20/20. 8 Length of tapered portion, mm 550 200 Diameter of the tapered core:
  • a method as defined in claim 8, wherein the die is made of soft iron, brass, aluminum, amuminum alloy, lead, polyurethane, or the like.
  • An apparatus for producing tapered tubes comprising: a movable plate horizontally shiftable under the action of a driving shaft; a fixed plate located opposingly to said movable plate and including a dieholder at the central portion thereof; a tapered core coupled with said movable plate and shifted through said dieholder supported by said fixed plate; and a centrally apertured disc shaped die having substantially parallel, substantially coextensive front and rear faces extending between the inner and outer peripheries of said die and formed of a material having plasticity and elasticity, but the resistivity thereof against the plastic deformation being higher than that of said tube blank, and having an inner bore plastically deformable according to the taper of the tapered core.
  • An apparatus for producing curved tapered tubes comprising: a movable plate horizontally shiftable under the action of a driving shaft; a fixed plate located opposingly to said movable plate and having, at the central portion thereof, a dieholder fitted with die being attached so that the dieholder can be freely rotatably, said die having an inner bore border plastically axially deformable according to the taper of a core and forming thereby a tube blank into the tapered tube; and a tapered core having a curved centerline and coupled to said movable plate through an intermediate rod freely movably, so that the tapered core is shiftable through said die attached on the fixed plate; whereby said curved tapered tube is automatically formed under the existence of said die, the angle of which is gradually changeable in accordance with the shift of said tapered core.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
US771515A 1968-02-08 1968-10-29 Method and apparatus for producing tapered tube Expired - Lifetime US3602030A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP756868A JPS4914066B1 (enExample) 1968-02-08 1968-02-08
JP3958968 1968-05-15
JP3243268 1968-05-15

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US3602030A true US3602030A (en) 1971-08-31

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US771515A Expired - Lifetime US3602030A (en) 1968-02-08 1968-10-29 Method and apparatus for producing tapered tube

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US (1) US3602030A (enExample)
DE (1) DE1900741C3 (enExample)
FR (1) FR1591423A (enExample)
GB (1) GB1252018A (enExample)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807213A (en) * 1971-10-28 1974-04-30 Aluminum Co Of America Method of making a hollow metal bat
US4653306A (en) * 1983-12-14 1987-03-31 Tubi Italia S.P.A. Method for preparing tubular chills for continuous steel casting plants
US4722213A (en) * 1981-03-13 1988-02-02 Santrade Ltd. Method and apparatus for the production of bent tubes
US4828783A (en) * 1986-02-07 1989-05-09 Krupp Corpoplast Maschinenbau Gmbh Process and apparatus for producing hollow bodies from thermoplastic material
US4847032A (en) * 1986-02-07 1989-07-11 Krupp Corpoplast Maschinenbau Gmbh Process for producing hollow bodies from thermoplastic material
US6330893B1 (en) 1999-12-03 2001-12-18 Shelby Enterprises, Inc. Fuel tank filter neck and method of manufacturing same
US6588459B2 (en) 1999-12-03 2003-07-08 Shelby Enterprises, Inc. Fuel tank filler neck and method of manufacturing same
US20040074556A1 (en) * 1999-12-03 2004-04-22 O'connell Patrick R. Fuel tank filler neck and method of manufacturing same
US6860134B2 (en) * 2000-12-28 2005-03-01 Riken Ironing dies
US20050072471A1 (en) * 2003-10-06 2005-04-07 Choi Young Ill Spare fuel tank in a fuel tank of a vehicle
US7048019B2 (en) 2003-09-30 2006-05-23 Shelby Enterprises, Inc. Fuel filler tube assembly and manufacturing method
WO2015188101A1 (en) * 2014-06-06 2015-12-10 Bly Ip Inc. Inner tube assembly with tapered inner wall and systems and methods for using and making same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60184429A (ja) * 1984-03-02 1985-09-19 Toyo Seikan Kaisha Ltd しごき成形機

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US616357A (en) * 1898-12-20 Alfred mil ward reynolds and john thomas hewitt
US717178A (en) * 1902-10-14 1902-12-30 John Earle Manufacture of curved tubes, pipe-coils, or the like.
US1163062A (en) * 1914-03-24 1915-12-07 Tri Prong Hair Pin Co Wire-drawing die.
US1534698A (en) * 1922-11-03 1925-04-21 Gansert Fred Method of and apparatus for making paper-box caps
US1962469A (en) * 1931-06-01 1934-06-12 Taylor Forge & Pipe Works Method of making pipe bends
US2560822A (en) * 1945-11-08 1951-07-17 Walton S Robinson Means and method for making seamless pipe elbows
US3167044A (en) * 1958-04-14 1965-01-26 Kaiser Aluminium Chem Corp Forming apparatus
US3243985A (en) * 1964-09-28 1966-04-05 Atomic Energy Authority Uk Extrusion apparatus
US3327513A (en) * 1965-02-12 1967-06-27 John W Hinshaw Method and apparatus for working metal

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US252423A (en) * 1882-01-17 Edwin b
US616357A (en) * 1898-12-20 Alfred mil ward reynolds and john thomas hewitt
US717178A (en) * 1902-10-14 1902-12-30 John Earle Manufacture of curved tubes, pipe-coils, or the like.
US1163062A (en) * 1914-03-24 1915-12-07 Tri Prong Hair Pin Co Wire-drawing die.
US1534698A (en) * 1922-11-03 1925-04-21 Gansert Fred Method of and apparatus for making paper-box caps
US1962469A (en) * 1931-06-01 1934-06-12 Taylor Forge & Pipe Works Method of making pipe bends
US2560822A (en) * 1945-11-08 1951-07-17 Walton S Robinson Means and method for making seamless pipe elbows
US3167044A (en) * 1958-04-14 1965-01-26 Kaiser Aluminium Chem Corp Forming apparatus
US3243985A (en) * 1964-09-28 1966-04-05 Atomic Energy Authority Uk Extrusion apparatus
US3327513A (en) * 1965-02-12 1967-06-27 John W Hinshaw Method and apparatus for working metal

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807213A (en) * 1971-10-28 1974-04-30 Aluminum Co Of America Method of making a hollow metal bat
US4722213A (en) * 1981-03-13 1988-02-02 Santrade Ltd. Method and apparatus for the production of bent tubes
US4653306A (en) * 1983-12-14 1987-03-31 Tubi Italia S.P.A. Method for preparing tubular chills for continuous steel casting plants
US4828783A (en) * 1986-02-07 1989-05-09 Krupp Corpoplast Maschinenbau Gmbh Process and apparatus for producing hollow bodies from thermoplastic material
US4847032A (en) * 1986-02-07 1989-07-11 Krupp Corpoplast Maschinenbau Gmbh Process for producing hollow bodies from thermoplastic material
US7059365B2 (en) 1999-12-03 2006-06-13 Shelby Enterprises, Inc. Fuel tank filler neck and method of manufacturing same
US20080128415A1 (en) * 1999-12-03 2008-06-05 Shelby Enterprises, Inc. Fuel tank filler neck and method of manufacturing same
US20040074556A1 (en) * 1999-12-03 2004-04-22 O'connell Patrick R. Fuel tank filler neck and method of manufacturing same
US6588459B2 (en) 1999-12-03 2003-07-08 Shelby Enterprises, Inc. Fuel tank filler neck and method of manufacturing same
US7343942B2 (en) 1999-12-03 2008-03-18 Shelby Enterprises, Inc. Fuel tank filler neck and method of manufacturing same
US20060065325A1 (en) * 1999-12-03 2006-03-30 O'connell Patrick R Fuel tank filler neck and method of manufacturing same
US6330893B1 (en) 1999-12-03 2001-12-18 Shelby Enterprises, Inc. Fuel tank filter neck and method of manufacturing same
US6860134B2 (en) * 2000-12-28 2005-03-01 Riken Ironing dies
US7048019B2 (en) 2003-09-30 2006-05-23 Shelby Enterprises, Inc. Fuel filler tube assembly and manufacturing method
US20060174972A1 (en) * 2003-09-30 2006-08-10 Pacitto Angelo Jr Fuel filler tube assembly and manufacturing method
US7677278B2 (en) 2003-09-30 2010-03-16 Shelby Enterprises, Inc. Fuel filler tube assembly and manufacturing method
US20100132837A1 (en) * 2003-09-30 2010-06-03 Shelby Enterprises, Inc. Fuel filler tube assembly and manufacturing method
US20050072471A1 (en) * 2003-10-06 2005-04-07 Choi Young Ill Spare fuel tank in a fuel tank of a vehicle
WO2015188101A1 (en) * 2014-06-06 2015-12-10 Bly Ip Inc. Inner tube assembly with tapered inner wall and systems and methods for using and making same

Also Published As

Publication number Publication date
GB1252018A (enExample) 1971-11-03
DE1900741C3 (de) 1975-07-03
DE1900741A1 (de) 1969-09-04
DE1900741B2 (de) 1974-11-21
FR1591423A (enExample) 1970-04-27

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