US2655187A - Means for producing tubular bodies from wood by coiling up veneer sheets - Google Patents

Means for producing tubular bodies from wood by coiling up veneer sheets Download PDF

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Publication number
US2655187A
US2655187A US149694A US14969450A US2655187A US 2655187 A US2655187 A US 2655187A US 149694 A US149694 A US 149694A US 14969450 A US14969450 A US 14969450A US 2655187 A US2655187 A US 2655187A
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United States
Prior art keywords
mandrel
coiling
veneer
wood
veneer sheets
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Expired - Lifetime
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US149694A
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English (en)
Inventor
Moe Halfdan Nilsen
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I S INTERPLY
I/S INTERPLY
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I S INTERPLY
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
    • B27D1/086—Manufacture of oblong articles, e.g. tubes by spirally winding veneer blanks

Definitions

  • This invention relates to a method and means for producing tubular bodies from wood by coiling up veneer sheets on a core or mandrel, especially tubular bodies of cylindric shape.
  • Such bodies may for instance be used as suction or feed tubes in Ventilating plants (such as in mines or mills), in pipe transport plants, for producing cylindric containers to be provided with bottom and cover (such as for powdered and liquid substances and also for other materials of the kind which will corrode sheet metal or iron containers), and in several other fields of technics.
  • Wooden tubular bodies may be produced by coiling up a veneer ribbon or web having the fibres either in the coiling direction or transverse to same or having a fiber direction which alternates in the coiling direction for making plywood tubes.
  • the nbre direction may eventually form about 45 with the coiling direction and change from section to section of the web so that also in such case the bre direction of the single layers are perpendicular to one another as in plywood.
  • a veneer web is coiled up several times around a core or a mandrel until the desired thickness is obtained. It is also known to stack veneer sheets having alternating bre direction with an intermediate binder whereupon such pack is bent around the mandrel or core.
  • the present invention relates to a simple and cheap method for producing veneer tubes and consists in the following steps: After having been provided with a suitable binder two or more Veneer sheets having a iibre direction which changes substantially 90 degrees from layer to layer, are placed one upon the other and coiled up on a mandrel before the binder is hardened, so as to overlap, whereupon the binder joining the ends together is hardened by local heating by the application of a high frequency eld between the mandrel and a pressure roller.
  • Fig. 1 shows a cross section of the joint of a coiled up tubular body with the adjacent parts of a mandrel and a pressure roller.
  • Fig. 2 schematically a machine for carrying out the method according to the invention, seen from the side, and
  • Fig. 3 a cross section of the mandrel taken along line III in Fig. 2.
  • Fig. 1 only the part of the mandrel at which the joint appears, is shown and designated by I and an electrode embedded therein by 2.
  • a slot serving to retain the leading end of the veneer sheet pack is numbered 3.
  • the tubular plywood body to be produced is in the present case made from a stack of three veneer sheets 4, 5 and 6 of which sheets 4 and 6 may have the fibres in the coiling direction as indicated by an arrow "I, and sheet 5, the fibres substantially transverse to said direction.
  • the pressure roller 8 and the electrode 2 will appear on opposite sides of the joint 4', 5', 5 when the veneer pack has been coiled up.
  • the three layers 4, 5 or G have also been displaced relative to each other in the coiling direction so as to form a relatively even joint which may, later on, be smoothed by some suitable tool.
  • a tube is obtained having constant thickness except with respect to the joint and will have twice the number or layers as compared with the other parts of the tube body, see Fig. 1. In very many cases this will be without importance in View of the fact that the production itself will be much cheaper as compared with tubes made by coiling up a veneer web comprising sheets having alternating bre direction.
  • Fig. 2 is shown an embodiment of a machine which may be used for practicing the method according to the invention.
  • the mandrel i is built up from three sectors I', I and 1"', between which normally exists a certain distance in peripheric direction, see especially Fig. 3.
  • the mandrel i is made contractible in the radial direction, so that the coiled up tube may be easily removed from the mandrel after the joint has been bound together by the above described heating treatment.
  • three sectors I', I", 5" may be radially displaceable parallel to themselves or, as in the present case, being hinged to the end of shaft 9 by ears I4 fixed to said shaft.
  • the sections I', I", I" are each provided with an extension forming on its end a sleeve for a bolt journalled to said ears. This will appear clearly from Fig. 2.
  • the other free end of the mandrel I is provided with an adjusting means comprising a hand wheel I6, the shaft of which may be rotatable concentrically to shaft 9 and may have a cam disc or the like formed with three cams of spiral shape.
  • the shaft 9 is supported by two bearings ill fixed to the top of the machine frame I3.
  • the right end of said shaft 9 has a pulley ll driven by belts l2.
  • a freely rotatable roller 53 In the machine table is arranged a freely rotatable roller 53, the bearings l-'l of which areA between said mandrel and said Toller, lastwill move in the downward direction and press the veneer sheets together during the coiling oper-v ation.
  • the pressure with which the sheets are pressed together will depend upon theair pressure in the cylinders J2e.
  • Bone-of .the.sectors in the presentcase sector i', is provided with a slot-..3 which .serves to retain the leading end of the veneer V pack :during :the coiling process.
  • the same sector is also provided with ametallic member 2 having a certain dimension in the peripheric direction and extending throughout the whole length of the mandrel. This metallic member serves as anelectrode-during heating of the joint.
  • the other'partofsection i' is Ymade from an insulating material, for instance wood..
  • the other-segments l'and 1" are preferably metallic and may be inwardly heated by some suitable means, for instance by pipe coils supplied with steam or some heated liquid, such as water, oil or Dowtherin liquid a heat-transfer medium comprisinga mixture of dipnenyl vand diphenyl oxide, or by a. resistance wire .connected to the main'supply. Arisa consequence o. this heating of the mandrel, also a certain degreezoi hardening of the binder will take r'place during the coiling operation.
  • the mandrel may be heated up to 300 centigrade which will-,notonly serve to dry out the veneer sheets but also aid in the hardening process of .the intermediate binder.
  • the joint When the high frequency neld isapplied between the electrode' 2 andthe roller 3, the joint will be subjected to a ⁇ ,dielectric heating so that the binder will very soon become hardened (polymerized). As soon es Athe'highlfreduency has performed its action, say already afterto 60seconds, the tube may be removed fromthe mandrel and placed in some other place forvfurther hardening of the-binder.
  • thermo-setting resins As binders of that kind may be mentioned Cil urea, phenolic, melamine formaldehyde and similar thermo-setting resins. In certain cases also thermo-plastic resins may be used.
  • ⁇ said body may be placed Vin Ya hardening chamber in which it is subjected to heat treat ment by high temperature.
  • the tube 'body may be provided with another core, or other precautions may be taken to ensure that the tube body ⁇ will attain Vits desired shape, for instance circular, oval ⁇ V or rectangular with rounded corners.
  • the tube bOdy may ⁇ easily be removed from the vmandrel after'the soiling operation and the heat treatment 'by high frequency have been performed.
  • the lpressure roller 8 may be provided with brake means so that the -veneer .pack vis stretched and consequently coiled very ,tight around the mandrel during the coiling operation.
  • sectors i" and 1" of the mandrel l may be heated in some suitable way, for instance by steam, water, oil or electricity.
  • the hardening time may be further reduced when the pressure roller 3 is also heated, for in stance in the same way vas the mandrel.
  • the joint may befurther smoothed by some cutting or grinding tool, at least near the ends of the tubes ⁇ when saine is tovbe provided with bottom and'cover for'producing veneer drums and the like.
  • Containers for special use may be provided with an intermediate metallic layer or with an inner metallic lining, for instance byproviding an aluminium sheet between two of the ,layers 4, 5 and 6 or on the inner side of layer li.
  • metallic layer may be replaced by a paper or a textile sheet.
  • a machine for producing tubular Wooden bodies from'coiled veneer sheets comprising. in combination, an interiorly-.heated Adriven mandrel, a pressure roller havingan axis parallel to the axis of the mandrel and being movable radially toward and away from Vthe surface Vof vthe mandrel, and means Vfor radially ,moving the roller and'releasably pressing the surfaceof'the pressure roller lagainst the surface of the mandrel, said mandrel-beingformed from a plurality of longitudinal complementary cylinder segments adapted to be displaced radially relative to the axis ci the mandrel for increasing anddecreasing the circumference of the mandrel, said cylv the axis of the mandrel and being movable radially toward and away from the surface of the mandrel, and means for radially moving the roller and releasably pressing the surface of the pressure roller against the surface of the mandrel, said man

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacture Of Wood Veneers (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
US149694A 1949-03-29 1950-03-15 Means for producing tubular bodies from wood by coiling up veneer sheets Expired - Lifetime US2655187A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NO1015237X 1949-03-29
NO678583X 1949-03-29
NO2655187X 1949-03-29
DEI4025A DE859222C (de) 1949-03-29 1951-04-12 Wickelmaschine zur Herstellung rohrfoermiger Koerper durch Aufwickeln von Furnierblaettern

Publications (1)

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US2655187A true US2655187A (en) 1953-10-13

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US (1) US2655187A (en(2012))
BE (1) BE502506A (en(2012))
DE (1) DE859222C (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993520A (en) * 1958-08-12 1961-07-25 Thorkildsen Per Machine for producing tube-shaped bodies from veneer sheets, especially barrel shells
US4311176A (en) * 1980-03-04 1982-01-19 Closeform S.R.L. Machine for manufacturing curvilinear convex wooden frames

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1174966B (de) * 1958-07-09 1964-07-30 Hausmann Blomberger Holz Rundpresse zur Herstellung von Rohren, Fass-maenteln od. dgl. aus Holz bzw. Kunststoff unter Verwendung von verleimten mehrlagigen Sperr-holz-, Furnier- bzw. Kunststoffplatten
DE1177331B (de) * 1960-04-13 1964-09-03 Rudolf Buchner Verfahren und Vorrichtung zum Herstellen von Moebeln, insbesondere von Tonmoebelgehaeusen

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US798630A (en) * 1904-09-12 1905-09-05 John L Sheppard Apparatus for forming barrels or drums.
US1001766A (en) * 1910-01-24 1911-08-29 George J Mayer Barrel-making machine.
US1022970A (en) * 1911-01-06 1912-04-09 Willard J Ott Veneer-barrel-making machine.
US1954183A (en) * 1929-09-07 1934-04-10 Fur Holzveredlung Ag Apparatus for manufacturing hollow bodies from ply-wood
US2339543A (en) * 1940-10-10 1944-01-18 Firestone Tire & Rubber Co Collapsible form
US2351692A (en) * 1942-06-06 1944-06-20 Wurlitzer Co Apparatus for producing high density plywood tubing
US2367831A (en) * 1942-11-24 1945-01-23 Firestone Tire & Rubber Co Collapsible form
US2379258A (en) * 1943-05-13 1945-06-26 William L Marshall Ltd Method of manufacturing tubular material
US2388541A (en) * 1942-12-02 1945-11-06 Henderson James Method of manufacturing laminated articles from veneer or like sheet material
US2416523A (en) * 1944-09-01 1947-02-25 Goodrich Co B F Expansible band-building drum
US2424558A (en) * 1944-01-13 1947-07-29 American Viscose Corp Apparatus for heat sealing
US2549810A (en) * 1945-10-31 1951-04-24 David E Hervey Method of and apparatus for forming tubular articles from laminated materials
US2570921A (en) * 1947-12-16 1951-10-09 William F Stahl Electronic heating of materials

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE619589C (de) * 1935-10-03 Georg Schlesinger Dr Verfahren zum Herstellen eines Wickelzuschnitts fuer das Wickeln fugenloser Sperrholzhohlkoerper
DE633041C (de) * 1932-02-19 1936-07-18 Georg Schlesinger Dr Ing Wickeltrommel mit schwenkbaren Sektoren zum Herstellen von Hohlkoerpern aus miteinander verleimten Furnierlagen
DE596214C (de) * 1932-02-19 1934-04-28 Georg Schlesinger Dr Ing Maschine zum Erzeugen von Hohlkoerpern aus miteinander verleimten Furnierlagen
DE604888C (de) * 1932-10-01 1934-10-31 Georg Schlesinger Dr Ing Verfahren und Vorrichtung zum Herstellen von Hohlkoerpern aus miteinander verleimten Furnierlagen

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US798630A (en) * 1904-09-12 1905-09-05 John L Sheppard Apparatus for forming barrels or drums.
US1001766A (en) * 1910-01-24 1911-08-29 George J Mayer Barrel-making machine.
US1022970A (en) * 1911-01-06 1912-04-09 Willard J Ott Veneer-barrel-making machine.
US1954183A (en) * 1929-09-07 1934-04-10 Fur Holzveredlung Ag Apparatus for manufacturing hollow bodies from ply-wood
US2339543A (en) * 1940-10-10 1944-01-18 Firestone Tire & Rubber Co Collapsible form
US2351692A (en) * 1942-06-06 1944-06-20 Wurlitzer Co Apparatus for producing high density plywood tubing
US2367831A (en) * 1942-11-24 1945-01-23 Firestone Tire & Rubber Co Collapsible form
US2388541A (en) * 1942-12-02 1945-11-06 Henderson James Method of manufacturing laminated articles from veneer or like sheet material
US2379258A (en) * 1943-05-13 1945-06-26 William L Marshall Ltd Method of manufacturing tubular material
US2424558A (en) * 1944-01-13 1947-07-29 American Viscose Corp Apparatus for heat sealing
US2416523A (en) * 1944-09-01 1947-02-25 Goodrich Co B F Expansible band-building drum
US2549810A (en) * 1945-10-31 1951-04-24 David E Hervey Method of and apparatus for forming tubular articles from laminated materials
US2570921A (en) * 1947-12-16 1951-10-09 William F Stahl Electronic heating of materials

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993520A (en) * 1958-08-12 1961-07-25 Thorkildsen Per Machine for producing tube-shaped bodies from veneer sheets, especially barrel shells
US4311176A (en) * 1980-03-04 1982-01-19 Closeform S.R.L. Machine for manufacturing curvilinear convex wooden frames

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Publication number Publication date
DE859222C (de) 1952-12-11
BE502506A (en(2012))

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