US2563641A - Double twist spindle - Google Patents

Double twist spindle Download PDF

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Publication number
US2563641A
US2563641A US136674A US13667450A US2563641A US 2563641 A US2563641 A US 2563641A US 136674 A US136674 A US 136674A US 13667450 A US13667450 A US 13667450A US 2563641 A US2563641 A US 2563641A
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US
United States
Prior art keywords
spindle
yarn
cup
shaft
disc
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
US136674A
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English (en)
Inventor
Colombu Eugene
Chapuis Henri
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.)
Comptoir des Textiles Artificiels SA
Original Assignee
Comptoir Textiles Artificiels
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
Application filed by Comptoir Textiles Artificiels filed Critical Comptoir Textiles Artificiels
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Publication of US2563641A publication Critical patent/US2563641A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/10—Tension devices
    • D01H13/104—Regulating tension by devices acting on running yarn and not associated with supply or take-up devices
    • D01H13/106—Regulating tension by devices acting on running yarn and not associated with supply or take-up devices for double-twist spindle
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/02—Spinning or twisting arrangements for imparting permanent twist
    • D01H7/86—Multiple-twist arrangements, e.g. two-for-one twisting devices ; Threading of yarn; Devices in hollow spindles for imparting false twist
    • D01H7/862—Arrangements for holding the bobbin in a fixed position

Definitions

  • This invention relates to double twist spindles forimparting a twist to yarn and has for an ob- .iect to provide a high speed double twist spindle of novel and improved construction which is interchangeable with the usual spindles on standard twisting frames and which is particularly adapted for use with large yarn packages.
  • Another object is to provide a device of the above type having improved means for threading and starting and capable of smooth and uniform operation.
  • the invention is particularly advantageous in the twisting of continuous silk or rayon, and more particularly of fine yarns. but it is likewise applicable to twisting or increasing the twist of any other yarn.
  • the yarn is unwound from a stationary spool onto a hollow spindle revolving at high speed, and forms one loop as it unwinds and passes through the central opening of the spindle. whereupon it emerges below the spool through a lateral aperture and forms a second loop outside the first, passing towards a guide situated at a point on the axis of rotation of the spindle.
  • Various means have previously been proposed for holding the spool stationary on the spindle, such arrangements depending on mechanical, electrical or electromagnetic means.
  • the spindle is fitted at the point opposite the outlet aperture, with a conical plate reinforced by an exterior locking ring and having several channels, e. g. three, diverging within the conical body and facilitating the introduction of a needle to insert the thread at the starting.
  • the winding is enclosed in a stationary transparent bell shaped cap separating the two loops, particularly during starting operations.
  • Still another feature consists in the'mounting of the spool on an intermediate cup supported on a housing mounted on roller bearings upon the upper part of the spindle with elastic buffers establishing a connection between the cup and the housing.
  • Fig. l is a side elevation of a double twist spindle embodyins the present invention.
  • Fig. 2 is an enlarged vertical section taken substantially on the line 22 of Fig. 4 :1
  • Figs. 3, 4, 5 and 6 are horizontal sections taken on the lines 2-2, 4-4, 5-5 and 6-8 respectively of Fig. 2;
  • Fig. 7 is an enlarged detail sectional view through one of the braking members by which the rotation of the spindle is stopped.
  • the spindle including a shaft II, the lower portion of which has a conical end il resting on a special thrust-bearing l2 in a cup ii on a bracket
  • the vertical position of the bearing I2 is adjusted by means of shim IS.
  • the cup l3 constitutes an oil sump.
  • a fixed banle it prevents creeping of oil along the shaft.
  • the shaft It is centered and supported by a roller-bearing I! in a boss ll of the bracket H.
  • the upper portion of the shaft in is formed with an axial bore 20' enlarged'at either end and registering at the bottom with symmetrically inclined openings 2
  • is hot-forced on the shaft [ll above the bearing H.
  • a circular plastic disc 25 is mounted on the sleeve 22 and has three inclined holes 28 positioned 120 apart registering with the channels 23 whose center lines are generatrices of a cone. Small resistant tubular inserts 21 are placed in these holes 26 to avoid mechanical degradation of the yarn by contact with the plastic disc.
  • the disc 25 is reinforced by a steel ring 28 coated with hard chrome.
  • This specially shaped ring is likewise pierced with three holes at 120, matching those in the disc. It has a peripheral groove 29 so shaped that the yarn having one of three holes can wind helically on the ring and make one or more turns in the groove before separating from the ring and forming the lower part of the loop.
  • the ring has a head 30 on its upper surface to match a groove 3
  • a cylindrical sleeve 25 of plastic or non-magnetic metal is iournalled on'anti-friction bearings 36 and 21 on the free upper end of the shaft 66 II with a lower shoulder 3
  • a plastic cup I! is mounted on the sleeve 35 by two semi-flexible rubber buffers 4
  • the upper portion'of this cup 32 carries the twist-halting arrangement, consisting of a steel ball 43' in a '60 cone ll concentric with the bore of the shaft It.
  • the cone 44 is also of steel. but coated with hard chrome.
  • This cone II is held in place by a nut I! screwed on the cup 32, and having a depending skirt 46 to sup-- port a metal cone 41 carrying the yarn package 40.
  • the hemispherical upper end of the cone 41 is provided with a rolled bead 50 having a high polish and applying a slight tension to the yarn passing thereon, thus avoiding untwisted filaments.
  • the general form of the cone 41 is such as to facilitate passage of the needle carrying the yarn.
  • 32 is in the form of a truncated cone and has 'two rows of three rectangular openings 52 and is spaced 120 apart and adapted to receive the poles I and II of the magnetic holding means for the spool.
  • the lower part of the cup carries a smallbircular trough 56 to catch any lubricant that may leak from the bearing 30.
  • a transparent plastic bell is seated on a flange ll of the cup 31, encloses the spindle and prevents contact, during starting, between the unwound yam and the yarn forming the balloon.
  • the outer fitting 12 in the form of an inverted cup, is a piece of pressure-cast nonmagnetic metal or plastic. It is centered and attached by screws 13 to the upper part of the bracket ll.
  • the clearance required for the passage of yarn, may vary between 2 and 3 mm.
  • the fitting 12 has a wide cut-out 15 opening above into a slit 16. These openings permit access to the revolving disc, and allow for initial needlingin of the yarn.
  • the closure consists of a pressed sheet-metal shutter ll enveloping the lower part of the outer fitting l2 and rotatable about the latter. It is centered by a groove 19a in a collar 19 of the bracket M. It has a cut-out of the same shape as that in the outer fitting. By simply tuming this part, the opening in the fitting may be opened or closed at, will. Braking is accomplished by three small pins 80, one of which is shown enlarged in Fig. 7, 120 apart, passing through the outer fitting and raised by three As they rise, three pins slightly lift the disc A and hold it. They are retained by three leaf springs 82 when the rotation of the shutter is reversed.
  • the yarn then passes down the bore 20 of the shaft l0, through one of the holes 24 in the disc 28 and in one or more turns around the chromed steel ring 20, the number of turns depending on the tension applied by the preceding elements.
  • the yarn then balloons out centrifugally and passes through the guide 00 to the winding spool.
  • the spindle for much larger windings up to 2000 grams, is similar indesign, but is of course larger and carries larger bearings, such as ball bearings where necessary in view of the greater weight.
  • the device described has numerous advantages.
  • the permanent magnet used does not involve the complications of electromagnetic or mechanical systems, and imposes no speed limitation.
  • the ball brake affords a simple and accurate maintenance of uniform tension, and
  • a double twist spindle for a yarn twister comprising a vertical shaft rotatably mounted in upper and lower: bearings and projecting upage support journalled on said shaft, above said upper bearinaan annular outer member disposed around said support, magnetic members carried by said outer member and by said support to hold said support against rotation, a rotatable sleeve on said outer member, openings in said last sleeve and in said 01 tax member to be aligned for threading the spindle, a brake carried by said outer member are-2:,ed to stop said shaft, and means actuated by said last sleeve in responseto turning thereof to set'and release said brake, said shaft having an axial bore extending from its upper end to receive yarn from saidpackage, a disc fixed to said shaft below s .d package support having a plurality of symmetrical, upwardly inclined holes communicating with said bore and terminating in the outer periphery'of said disc and adapted to paw a flexible wire for threading the spindle.
  • a spindle as set forth in claim 1, in which said brake comprises a set of pins carried by said outer member to engage said disc and said last sleeve carries inclined su'rfaces adapted to raise said pins into braking contact with said disc.
  • a spindle as set forth in claim 1, in which said yarn package support comprises a conical member, said last member having a. top rim to engage and apply friction to the yarn passing thereover from said package into said bore.
  • said shaft having an axial bore extending from its upper end to receive yarn from said package, a disc fixed to said shaft below said package support having a plurality of symmetrical, upwardly inclined holes communicating with said bore and terminating in the outer periphery of said disc and adapted to pass a flexible wire for the spindle;
  • a double twist spindle for a yam twister, comprising a vertical shaft, a yarn package support journalled on said shaft, a circular permanent magnet attached to said support, a pair of annular armatures carried at the top and bottom of said magnet and each having a plurality of outwardly. projecting pole pieces equally spaced circumferentially, an outer annular member of non-magnetic material disposed around said support and a plurality of spaced plates of magnetic material carried by said outer memher and disposed to close-the magnetic circuit Number between said armatures with a short air gap for the passage of the yarn.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US136674A 1949-01-12 1950-01-04 Double twist spindle Expired - Lifetime US2563641A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR982134T 1949-01-12

Publications (1)

Publication Number Publication Date
US2563641A true US2563641A (en) 1951-08-07

Family

ID=8887364

Family Applications (1)

Application Number Title Priority Date Filing Date
US136674A Expired - Lifetime US2563641A (en) 1949-01-12 1950-01-04 Double twist spindle

Country Status (7)

Country Link
US (1) US2563641A (es)
BE (2) BE492203A (es)
CH (2) CH287175A (es)
DE (2) DE875624C (es)
FR (2) FR982134A (es)
GB (2) GB681562A (es)
IT (1) IT500217A (es)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731786A (en) * 1954-07-01 1956-01-24 klein
DE952423C (de) * 1953-04-22 1956-11-15 Barer Maschinenfabrik Ag Doppeldraht-Zwirnspindel
DE959446C (de) * 1953-04-09 1957-03-07 Hugo Altenoeder Streckwerk fuer Spinnereimaschinen
DE968222C (de) * 1952-03-18 1958-01-23 North American Rayon Corp Doppeldraht-Zwirnspindel
US2843997A (en) * 1951-05-08 1958-07-22 Alfred W Vibber Twisting spindle balloon control
US2880567A (en) * 1955-11-01 1959-04-07 Otto V Drtina Double-twist spindle for high speed up-twisting of fine-denier yarns
DE1073363B (de) * 1953-08-24 1960-01-14 Maschinenfabrik Schweiter A.G., Horgen (Schweiz) Vorrichtung zum Absaugen von Staub und Flaum an einer Spulmaschine
DE1159318B (de) * 1955-06-20 1963-12-12 Deering Milliken Res Corp Zwirnvorrichtung, insbesondere Kordzwirnvorrichtung
DE1164285B (de) * 1957-10-01 1964-02-27 Volkmann & Co Doppeldrahtzwirnspindel mit einem durch Dauermagneten stillgehaltenen Topf
US3132464A (en) * 1962-03-23 1964-05-12 Earl W Starnes Threading means for yarn apparatus
US3269103A (en) * 1963-12-21 1966-08-30 Palitex Project Co Gmbh A device for arresting a multiple twist spindle
DE1227812B (de) * 1962-03-01 1966-10-27 Volkmann & Co Spinn- und Zwirnspindeln
US3338043A (en) * 1964-09-25 1967-08-29 Palitex Project Co Gmbh Multiple twist spindle
US3343359A (en) * 1966-02-07 1967-09-26 Palitex Project Co Gmbh Protective pot for multiple twist spindles
US3368337A (en) * 1965-04-17 1968-02-13 Palitex Project Co Gmbh Multiple twisting frame fitted with permanent magnets
US3374618A (en) * 1966-05-06 1968-03-26 Palitex Project Co Gmbh Protective pot for two-for-one twisting spindles
DE1283132B (de) * 1963-12-13 1968-11-14 Palitex Project Co Gmbh Doppeldrahtzwirnspindel
JPS50142827U (es) * 1974-05-13 1975-11-25
JPS5161132U (es) * 1974-11-04 1976-05-14
JPS5177329U (es) * 1974-12-13 1976-06-18
DE2926029A1 (de) * 1979-06-28 1981-01-08 Barmag Barmer Maschf Doppeldrahtzwirnspindel
US4261164A (en) * 1978-07-12 1981-04-14 Verdol S.A. Double twist spindles
CN106637554A (zh) * 2015-11-04 2017-05-10 索若德国两合股份有限公司 用于倍捻锭子的球形纱线制动器
CN106637555A (zh) * 2015-11-04 2017-05-10 索若德国两合股份有限公司 用于倍捻锭子的球式纱线制动器

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2952114A (en) * 1951-05-08 1960-09-13 Alfred W Vibber Twisting spindle balloon control
DE1076587B (de) * 1955-06-27 1960-02-25 Zangs Ag Maschf Schussspulen-Auswechselvorrichtung mit Spulentrommel fuer Wechselwebstuehle
NL107517C (es) * 1959-02-04
BE638987A (es) * 1962-10-23
CH427592A (de) * 1963-08-09 1966-12-31 Palitex Project Co Gmbh Fadenbremse an Doppeldrahtspindeln
DE1268032B (de) * 1963-08-09 1968-05-09 Palitex Project Co Gmbh Fadenbremse an Doppeldrahtzwirnspindeln
NL6909591A (es) * 1968-06-29 1969-12-31
FR1603899A (es) * 1968-12-31 1971-06-07
DE2050490B2 (de) * 1970-10-14 1977-09-15 Hamel GmbH, Zwirnmaschinen, 4400 Munster Mehrstufige fadenbremsvorrichtung an einer doppeldrahtzwirnspindel
FR2127629A5 (es) * 1971-03-30 1972-10-13 Schubert & Salzer Maschinen
DE7123827U (de) * 1971-06-21 1971-10-07 Hamel Gmbh Fadenführungs- und Bremseinrichtung
USRE30920E (en) 1972-10-16 1982-05-04 Otto Zollinger, Inc. Yarn tensioning device and method
US4123014A (en) * 1977-03-21 1978-10-31 Milliken Research Corporation Yarn tension control
DE2925472C2 (de) * 1979-06-23 1986-06-12 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Kugelbremse, insbesondere zum Bremsen des ablaufenden Fadens im inneren Fadenballon einer Doppeldrahtzwirnspindel
DE3239495C2 (de) * 1982-10-26 1985-01-17 SIPRA Patententwicklungs-und Beteiligungsgesellschaft mbH, 7000 Stuttgart Kugelbremse für Textilfäden
DE3336714C2 (de) * 1983-10-08 1986-07-10 Palitex Project-Company Gmbh, 4150 Krefeld Ballonbegrenzerlose Doppeldraht-Zwirnspindel
DE3936354A1 (de) * 1989-11-02 1991-05-08 Schlafhorst & Co W Vorrichtung zum abgeben eines vorgarns an eine spinneinrichtung
CN109112685B (zh) * 2018-09-07 2019-11-12 苏州涵轩信息科技有限公司 一种球式张力器

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2125823A (en) * 1938-03-23 1938-08-02 Stoddard Nicholas Textile machine
US2156330A (en) * 1937-03-22 1939-05-02 Barmag Barmer Maschf Double twist twisting spindle
US2233645A (en) * 1940-06-17 1941-03-04 Atwood Machine Co Textile twisting unit
US2374085A (en) * 1943-07-23 1945-04-17 Saco Lowell Shops Twister
GB570346A (en) * 1942-11-25 1945-07-03 Standard Telephones Cables Ltd Making selenium elements
US2379806A (en) * 1944-05-05 1945-07-03 Sipp Eastwood Corp Double twist twister
US2445721A (en) * 1947-07-29 1948-07-20 Fletcher Works Inc Twisting machine
US2487838A (en) * 1947-08-01 1949-11-15 Howe Machinery Company Inc Twisting and cabling spindle
US2492778A (en) * 1948-10-06 1949-12-27 Howe Machinery Company Inc Yarn twisting apparatus and method

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE545462C (de) * 1932-03-04 Barmer Maschinenfabrik Akt Ges Fadenspannvorrichtung fuer Doppeldraht-Zwirnspindeln
DE598752C (de) * 1934-06-19 Hermann Zeising Dr Ing Doppeldraht-Zwirnspindel
DE546554C (de) * 1932-03-29 Koloman Bruell Dipl Ing Nachgiebiges Kugel- oder Rollenhalslager fuer Spinn-, Zwirn- und Spulspindeln
DE570346C (de) * 1931-10-28 1933-02-15 Rudolf Spiegelhauer Doppeldraht- bzw. Mehrfachdraht-Zwirnspindel
DE572050C (de) * 1931-10-31 1933-03-10 Karl Klitzsch Mehrfachdraht-Zwirnspindel
DE563746C (de) * 1932-03-13 1932-11-09 Karl Schuette Mehrfachdraht-Zwirnspindel, bei der der Spulentraeger durch elektromagnetische Kraefte festgehalten oder angetrieben wird
DE657647C (de) * 1937-01-08 1938-03-09 Barmer Maschinenfabrik Akt Ges Doppeldraht-Zwirnspindel
DE674945C (de) * 1937-03-22 1939-04-26 Barmer Maschinenfabrik Akt Ges Doppeldrahtzwirnspindel
CH230250A (de) * 1941-10-10 1943-12-31 Saco Lowell Shops Halteeinrichtung für Spindeln an Spinn- und Zwirnmaschinen.
US2397153A (en) * 1944-01-20 1946-03-26 North American Rayon Corp Adjustable yarn tension device
US2391307A (en) * 1944-01-26 1945-12-18 Saco Lowell Shops Yarn tensioning device
US2411126A (en) * 1945-03-02 1946-11-12 Saco Lowell Shops Twister frame
BE514773A (es) * 1947-12-20
GB677547A (en) * 1949-09-28 1952-08-20 Courtaulds Ltd Improvements in and relating to apparatus for twisting yarn, threads and the like
US2620617A (en) * 1950-02-03 1952-12-09 North American Rayon Corp Double twist spindle

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2156330A (en) * 1937-03-22 1939-05-02 Barmag Barmer Maschf Double twist twisting spindle
US2125823A (en) * 1938-03-23 1938-08-02 Stoddard Nicholas Textile machine
US2233645A (en) * 1940-06-17 1941-03-04 Atwood Machine Co Textile twisting unit
GB570346A (en) * 1942-11-25 1945-07-03 Standard Telephones Cables Ltd Making selenium elements
US2374085A (en) * 1943-07-23 1945-04-17 Saco Lowell Shops Twister
US2379806A (en) * 1944-05-05 1945-07-03 Sipp Eastwood Corp Double twist twister
US2445721A (en) * 1947-07-29 1948-07-20 Fletcher Works Inc Twisting machine
US2487838A (en) * 1947-08-01 1949-11-15 Howe Machinery Company Inc Twisting and cabling spindle
US2492778A (en) * 1948-10-06 1949-12-27 Howe Machinery Company Inc Yarn twisting apparatus and method

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2843997A (en) * 1951-05-08 1958-07-22 Alfred W Vibber Twisting spindle balloon control
DE968222C (de) * 1952-03-18 1958-01-23 North American Rayon Corp Doppeldraht-Zwirnspindel
DE959446C (de) * 1953-04-09 1957-03-07 Hugo Altenoeder Streckwerk fuer Spinnereimaschinen
DE952423C (de) * 1953-04-22 1956-11-15 Barer Maschinenfabrik Ag Doppeldraht-Zwirnspindel
DE1073363B (de) * 1953-08-24 1960-01-14 Maschinenfabrik Schweiter A.G., Horgen (Schweiz) Vorrichtung zum Absaugen von Staub und Flaum an einer Spulmaschine
US2731786A (en) * 1954-07-01 1956-01-24 klein
DE1159318B (de) * 1955-06-20 1963-12-12 Deering Milliken Res Corp Zwirnvorrichtung, insbesondere Kordzwirnvorrichtung
US2880567A (en) * 1955-11-01 1959-04-07 Otto V Drtina Double-twist spindle for high speed up-twisting of fine-denier yarns
DE1164285B (de) * 1957-10-01 1964-02-27 Volkmann & Co Doppeldrahtzwirnspindel mit einem durch Dauermagneten stillgehaltenen Topf
DE1227812B (de) * 1962-03-01 1966-10-27 Volkmann & Co Spinn- und Zwirnspindeln
US3132464A (en) * 1962-03-23 1964-05-12 Earl W Starnes Threading means for yarn apparatus
DE1283132B (de) * 1963-12-13 1968-11-14 Palitex Project Co Gmbh Doppeldrahtzwirnspindel
US3269103A (en) * 1963-12-21 1966-08-30 Palitex Project Co Gmbh A device for arresting a multiple twist spindle
US3338043A (en) * 1964-09-25 1967-08-29 Palitex Project Co Gmbh Multiple twist spindle
US3368337A (en) * 1965-04-17 1968-02-13 Palitex Project Co Gmbh Multiple twisting frame fitted with permanent magnets
US3343359A (en) * 1966-02-07 1967-09-26 Palitex Project Co Gmbh Protective pot for multiple twist spindles
DE1510866B1 (de) * 1966-02-07 1970-07-23 Palitex Project Co Gmbh Schutztopf fuer Mehrfachdrahtzwirnspindeln
US3374618A (en) * 1966-05-06 1968-03-26 Palitex Project Co Gmbh Protective pot for two-for-one twisting spindles
JPS50142827U (es) * 1974-05-13 1975-11-25
JPS5161132U (es) * 1974-11-04 1976-05-14
JPS5177329U (es) * 1974-12-13 1976-06-18
US4261164A (en) * 1978-07-12 1981-04-14 Verdol S.A. Double twist spindles
DE2926029A1 (de) * 1979-06-28 1981-01-08 Barmag Barmer Maschf Doppeldrahtzwirnspindel
CN106637554A (zh) * 2015-11-04 2017-05-10 索若德国两合股份有限公司 用于倍捻锭子的球形纱线制动器
CN106637555A (zh) * 2015-11-04 2017-05-10 索若德国两合股份有限公司 用于倍捻锭子的球式纱线制动器
EP3168343A1 (de) * 2015-11-04 2017-05-17 Saurer Germany GmbH & Co. KG Kugelfadenbremse für eine doppeldraht-zwirnspindel
CN106637555B (zh) * 2015-11-04 2019-02-22 索若德国两合股份有限公司 用于倍捻锭子的球式纱线制动器

Also Published As

Publication number Publication date
GB725283A (en) 1955-03-02
BE492203A (es)
FR62419E (fr) 1955-06-14
IT500217A (es)
BE516902A (es)
DE1061239B (de) 1959-07-09
CH287175A (fr) 1952-11-30
CH310134A (fr) 1955-09-30
DE875624C (de) 1953-05-04
FR982134A (fr) 1951-06-04
GB681562A (en) 1952-10-29

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