US3679035A - Bearing and drive means for large size revolving drums - Google Patents

Bearing and drive means for large size revolving drums Download PDF

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Publication number
US3679035A
US3679035A US68992A US3679035DA US3679035A US 3679035 A US3679035 A US 3679035A US 68992 A US68992 A US 68992A US 3679035D A US3679035D A US 3679035DA US 3679035 A US3679035 A US 3679035A
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United States
Prior art keywords
drum
rollers
rotating drum
axis
drum apparatus
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Expired - Lifetime
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US68992A
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English (en)
Inventor
Walti Schmitt
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.)
Aqseptence Group GmbH
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Passavant Werke AG and Co KG
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Publication date
Priority claimed from DE19702013230 external-priority patent/DE2013230C3/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/10—Constructively simple tooth shapes, e.g. shaped as pins, as balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/067—Construction of the filtering drums, e.g. mounting or sealing arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/11—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/27—Filters with filtering elements which move during the filtering operation with rotary filtering surfaces, which are neither cylindrical nor planar, e.g. helical surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D33/50—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/80—Accessories
    • B01D33/801—Driving means, shaft packing systems or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18—Drum screens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • F16C13/02—Bearings
    • F16C13/04—Bearings with only partial enclosure of the member to be borne; Bearings with local support at two or more points
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/24—Toothed gearings for conveying rotary motion without gears having orbital motion involving gears essentially having intermeshing elements other than involute or cycloidal teeth
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19642—Directly cooperating gears
    • Y10T74/19647—Parallel axes or shafts
    • Y10T74/19651—External type
    • Y10T74/19656—Pin teeth

Definitions

  • References Cited LARGE SIZE REVOLVING DRUMS UNITED STATES PATENTS [72] Inventor: Schmitt, W1esbaden-B1ebr1ch, Ger- 1,284702 H918 Junggrenm 2,029,873 2/1936 Jonsson 1 Assigneei PasSavaM-Werke Michelbach Hlme. 2,269,700 1 1942 Treshow ..263/33 R Germany 2,293,907 8/1942 Le Bus ..74/4l5 [22] Filed; Sept 2, 1970 2,316,986 4/1943 Parker 8 992 2,605,646 8/1952 Karlsson et al.
  • a plurality of rollers are mounted in a ring about the periphery of the drum and are free to run on one or more concave supporting surfaces located in position to support the drum.
  • Drive means such as a pinion, engage the rollers to rotate the drum.
  • the present invention relates to a drive and bearing design for large-size revolving drums, such as screen drums for screening machines or drum-type filters.
  • Screening machines are utilized, for example, in the treatment of waste water and the conditioning of potable water. Increasing efficiency and performance requirements have created a constant need for larger and more effective screens and filtering areas. In some particular cases this has led to screen drum designs with an internal diameter of almost 6 meters and a length of 12 meters. It is obvious that the design of bearing and drive means for drums of such dimensions poses some extra problems, particularly in view of bending and torsional stresses.
  • a design has been utilized wherein the screen drum is supported on axle bearings and the motive power is supplied by two motors at the drum ends.
  • This design has a central tread supported by several stationary rollers. If the two drive motors are not exactly synchronous, however, this screen drum design is exposed to torsional stress. In order to endure such stress, the drum design has to be excessively heavy and sturdy. Also, in order to avoid faulty concentric running of the drum, the running surface of the entire tread has to be lathed on a vertical boring mill which is extremely difficult with a diameter surpassing meters.
  • Other smaller screen drums in practice are supported at both ends on axle bearings and are equipped with a gear rim and pinion drive at their ends or with a chain belt.
  • drums may sag and deflect under load.
  • Drums of considerable length simply must have an additional support; any support at the circumference, however, causes moments of reaction which due to their application at an axial distance to the application of the drive may also lead to undesirable torsional stress on the drum.
  • the foregoing objects are achieved by having the drive means engage the drum in the same vertical plane in which the drum is supported at the circumference. Torsional stress is avoided, as the reaction moment of the bearing and the starting torque apply at the drum in the same vertical plane.
  • the drum therefore, may be of particularly light construction.
  • FIG. 1 is a foreshortened side view of a revolving drum screen, partly a longitudinal section. The drive of the screen drum and the bearing seats supporting the drum have been left out for the sake of clearness.
  • FIG. 2 is a front view of the lower part of the drum screen of FIG. 1.
  • FIG. 3 is a front view of the upper part ofthe drum of FIG. 1 with drive pinion and waste trough.
  • FIG. 4 is a section along line IVlV of FIG. 3.
  • FIG. 5 is a section along line V--V of FIG. 2.
  • a ring of running rollers arranged in a circle at the circumference of the drum supports the drum against one or more stationary, cylindrical, and concave running surfaces and the drum drive means engages the rollers.
  • the rollers thus supporting the drum also serve as a sort of gear ring engaged by the drive means which preferably consists of a pinion.
  • This method assures that the drive and the bearing are actually situated in the same vertical plane transverse to the drum axis. Besides, such a construction does not require precise finishing of a peripheral running surface. Only the axes of all rollers must be located on a circle concentric with the axis of the drum which can be achieved by comparatively simple means.
  • each of the roller rings thus formed is provided with a driven pinion.
  • both pinions are individually and elastically connected to a common drive shaft.
  • the rollers on either side of the flange can be supported in pairs at the ends of a king pin driven through the flange.
  • the pin in the flange can be made elastically tiltable.
  • the stationary running surfaces supporting the rollers can consist of two bearing seats arranged one on either side of the vertical meridian plane Of the drum.
  • each bearing seat should be pivoted with its center about an axis parallel to the drum axis.
  • each bearing seat can consist of two adjacent sections with a narrow clearing between them and each pivoted with their centers about axes parallel to the drum axis.
  • each bearing seat or each section thereof may be elastically tiltable about an axis which is vertical to a plane containing the drum axis and the pivot of the bearing seat or bearing seat section. In this way the supporting stress is equally divided between the roller rings to either side of the flange.
  • the running rollers and/or the drive pinion(s) preferably consist of a polyamide material.
  • the circle of running rollers with drive means is preferably arranged in the longitudinal center of the drum.
  • the drum itself should be supported at its ends on roller rings at the circumference or on axle bearings protruding from the front faces.
  • a preferred embodiment of the invention provides for the drum to be equipped with a safety switch which turns off the drive if excessive torsional torque is applied at the drum.
  • This saftey device preferably comprises (a) at least two signalers arranged in a plane with the drum axis and at considerable axial distance, (b) two stationary signal receivers also arranged in a plane containing the drum axis, each of the receivers cooperating with one of the signalers and emitting an electric impulse when passed by the signaler, and (c) a time control switch responding to the time difference of the pulses emitted by the signal receivers and switching off the drive if the time difference exceeds a preselected period.
  • the signalers can be permanent magnets and the signal receivers ignition switches released when passed by the magnets.
  • An alternative is provided by cams disposed at the drum periphery and operating stationary switches or interrupting stationary light barriers. The time lapse between occurrence of excessive torsion and interruption of drive may amount to a maximum of one revolution of the drum. This time lapse can be decreased by providing several signalers for each receiver, the signalers being arranged on the drum at regular angular distance.
  • the drum screen shown in FIG, I is housed in a chamber 10 and comprises a revolving drum 12 formed by two front walls l4, 16, a plurality of Iongitudinal tubes 18 connecting the front walls, and a number of screening baskets 20 mounted to the longitudinal tubes and covered by a fine-meshed screening fabric.
  • the drum is submerged up to level 22.
  • the water to be screened enters the drum 12 through a pipe inlet 24, while the cleaned water leaves the chamber through an outlet not shown.
  • the drum l2 revolves thus the screening baskets blocked by scum during operation emerge one by one from the water and are cleaned by means of a spray pipe 26 into which water is pressure-fed through pipelines 28.
  • the waste water and the screenings are collected in a waste trough 30 and are discharged through a pipe shaft 32 at the front wall opposite the inlet 24.
  • the drum 12 is pivoted on the short feed pipes 24, 32 serving as hollow axles by means of water-tight sleeve bearings 34, 36.
  • drum 12 is supported at its longitudinal center on two rings of running rollers 38 running on two stationary bearing seats 40, 42 (FIG. 2).
  • FIG. 1 does not show these bearing seats 40, 42 for the sake of clearness.
  • the running rollers 38 not only serve to support the drum [2 on the bearing seats 40, 42 but also to form a drive shaft gearing engaged by a pinion 44 providing the drive means ofthe drum 12 (FIG. 3).
  • the running rollers 38 are arranged in pairs on either side of a ring 46 composed of several segments (see FIG. 2) and protruding from the periphery of the drum 12.
  • the ring 46 has bores arranged on a pitch circle concentric with the drum axis.
  • King pins 48 through said bores are provided to support the ring rollers 38 (see FIG. 4).
  • Elastic bushings 50 may be provided to allow for slight tilting of the king pins 48.
  • the running rollers 38 arranged in pairs on both sides of the annular flange 46 form two circles of rollers cooperating with two drive pinions 44, 45.
  • the pinions 44,45 are mounted on a common drive shaft 52 which is driven by a geared engine 54 and with its free end supported on a fixed bearing 56.
  • the pinions 44, 45 are connected to the drive shaft 52 via couplings 58, 69 allowing a slight elastic torsion of the pinions relative to the shaft and consisting e.g. of rubber liners inserted between the flanges connected to the shaft and/or the pinions.
  • a slipper clutch 62 can be installed to avoid overload on the drive and revolving drum.
  • the bearing seats 40, 42 on which the running rollers 38 are working consist of two adjacent sections 64, 66 (as shown in FIG. 2). Each section is pivoted at the ends ofa swingletree 72 about axes 68, 70 parallel to the drum axis. The swingletree 72 is pivoted at its center about an axis 74 parallel to the drum axis and rests on a stationary support 76.
  • This construction provides a uniform distribution of the bearing load on each of the running rollers 38 (e.g. four rollers) simultaneously touching the bearing seat 40.
  • the swingletree 72 (as shown in FIG.
  • the running rollers 38 as well as the pinions 44, 45 preferably consist of a polyamide material, in addition, the bearing seats 40, 42 may have a low-friction running surface (80 in FIG. 5) also consisting of polyamide, for example.
  • the above-described bearing and drive for the drum filter can be constructed very simply.
  • the annular flange 46 supporting the running roller 38 is composed of segments and remains entirely unmachined. Only the pitch circles for the axles 46 of the running rollers and for the longitudinal tubing 18 which are fixed or welded to the flange 46 have to be marked. Shipment is effected in single parts which can be siteassembled.
  • the annular flange 46 can be elevated to such an extent that the running rollers 38 are entirely outside of the drum diameter determined by the screening baskets 20, so the baskets 20 can be arranged immediately at the annular flange 46.
  • the loss of screening area caused by the peripheral arrangement of the drum drive is comparatively insignificant.
  • Rotating drum apparatus comprising a cylindrical drum rotatable about a horizontal cylindrical axis, a plurality of rollers mounted in a ring about the periphery of said drum, drum support means comprising a concave running surface adjacent said drum in which said rollers run supporting said drum, and means for driving said drum engaging the periphery of said drum in the same vertical plane in which the drum is supported by said rollers.
  • Rotating drum apparatus according to claim 2 wherein said drive means comprises a pinion the tooth pitch of which corresponds to the spacing of said rollers.
  • Rotating drum apparatus wherein said drive means includes a pair of pinions, each pinion driving one of said rings of rollers.
  • Rotating drum apparatus according to claim 5 wherein said pinions are independently and flexibly coupled to a common drive shaft.
  • drum support means comprises two bearing seats located on opposite sides of the vertical meridian plane of the drum.
  • each bearing seat is pivoted with its center about an axis parallel to the drum axis.
  • each bearing seat comprises two adjacent sections which are pivoted independent of each other with their centers about axes parallel to the drum axis.
  • each bearing seat section is elastically tiltable about an axis which is vertical to a plane containing the drum axis and the pivot of the bearing seat section.
  • Rotating drum apparatus according to claim 1 wherein the rollers, the running surfaces, or the drum driving means are made of a polyamide material.
  • Rotating drum apparatus according to claim 1 wherein said ring of rollers with its drive is arranged in the longitudinal center of the drum, the drum ends being additionally rotatably supported.
  • Rotating drum apparatus according to claim 1 wherein the drum comprises a safety switch means responsive to excessive torsional torque on the drum to turn 0E the drive means.
  • Rotating drum apparatus according to claim 15 wherein the safety switch means comprises at least two signalers arl7.
  • Rotating drum apparatus according to claim 16 wherein the signalers comprise permanent magnets and the signal receivers being ignition switches.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Centrifugal Separators (AREA)
  • Rotary Pumps (AREA)
US68992A 1970-03-19 1970-09-02 Bearing and drive means for large size revolving drums Expired - Lifetime US3679035A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702013230 DE2013230C3 (de) 1970-03-19 Antriebs- und Lageranordnung für eine große Drehtrommel

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US3679035A true US3679035A (en) 1972-07-25

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US68992A Expired - Lifetime US3679035A (en) 1970-03-19 1970-09-02 Bearing and drive means for large size revolving drums

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US (1) US3679035A (xx)
CA (1) CA952040A (xx)
FR (1) FR2084914A5 (xx)
GB (1) GB1342389A (xx)
NL (1) NL169426C (xx)
SE (1) SE367555B (xx)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3797663A (en) * 1970-11-23 1974-03-19 L Bourdale Method of separating particles contained in a laden fluid, and a dynamic separator for performing this method
US4151760A (en) * 1976-06-11 1979-05-01 Bbc Brown, Boveri & Company Limited Apparatus for rotating multiply-mounted shafting
US5183568A (en) * 1991-08-22 1993-02-02 G A Industries, Inc. Self-cleaning strainer
WO1995019873A1 (de) * 1994-01-20 1995-07-27 Händle Gmbh & Co. Kg. Lagerung einer trommel in einer presse für keramische massen, insbesondere für die herstellung von dachziegeln
US5749820A (en) * 1994-06-14 1998-05-12 Paul Wurth S.A. Suspension device for a rotating body
US20050236790A1 (en) * 2002-03-22 2005-10-27 Carter William S Wheeled arrangement
US20130043179A1 (en) * 2011-08-19 2013-02-21 Peter J. Bugg Filtration tank with serially connected horizontal screens
US20130195602A1 (en) * 2010-07-09 2013-08-01 Esab Ab Roller bed with electrical clutch
US20140182136A1 (en) * 2012-12-31 2014-07-03 Spectrum Brands, Inc. Drive Component For Electric Shaver
US20160045936A1 (en) * 2014-08-13 2016-02-18 Cp Manufacturing, Inc. Rotary Sorting Appartus
US9636610B2 (en) * 2010-05-07 2017-05-02 Metalquima, S.A. Brine filtering device, applied to a meat product injection machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3644146C2 (de) * 1986-12-23 1994-09-01 Werner Doppstadt Siebvorrichtung zum Aussieben von Komposterde aus verrottetem, organischen Material

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1284702A (en) * 1918-06-11 1918-11-12 Gen Electric Bearing.
US2029873A (en) * 1933-02-24 1936-02-04 Jonsson Augustinus Edvard Apparatus for preparation of malt
US2269700A (en) * 1940-05-20 1942-01-13 Monolith Portland Cement Compa Kiln supporting means
US2293907A (en) * 1941-05-10 1942-08-25 Bus Franklin L Le Multiple roller gearing power transmission
US2316986A (en) * 1940-01-30 1943-04-20 Parker Victor Lee Bulb grading machine
US2605646A (en) * 1948-09-01 1952-08-05 Air Preheater Driving rack mechanism
US3386718A (en) * 1966-08-08 1968-06-04 Allis Chalmers Mfg Co Rotary heat exchanger with a chain drive

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1284702A (en) * 1918-06-11 1918-11-12 Gen Electric Bearing.
US2029873A (en) * 1933-02-24 1936-02-04 Jonsson Augustinus Edvard Apparatus for preparation of malt
US2316986A (en) * 1940-01-30 1943-04-20 Parker Victor Lee Bulb grading machine
US2269700A (en) * 1940-05-20 1942-01-13 Monolith Portland Cement Compa Kiln supporting means
US2293907A (en) * 1941-05-10 1942-08-25 Bus Franklin L Le Multiple roller gearing power transmission
US2605646A (en) * 1948-09-01 1952-08-05 Air Preheater Driving rack mechanism
US3386718A (en) * 1966-08-08 1968-06-04 Allis Chalmers Mfg Co Rotary heat exchanger with a chain drive

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3797663A (en) * 1970-11-23 1974-03-19 L Bourdale Method of separating particles contained in a laden fluid, and a dynamic separator for performing this method
US4151760A (en) * 1976-06-11 1979-05-01 Bbc Brown, Boveri & Company Limited Apparatus for rotating multiply-mounted shafting
US5183568A (en) * 1991-08-22 1993-02-02 G A Industries, Inc. Self-cleaning strainer
WO1995019873A1 (de) * 1994-01-20 1995-07-27 Händle Gmbh & Co. Kg. Lagerung einer trommel in einer presse für keramische massen, insbesondere für die herstellung von dachziegeln
US5749820A (en) * 1994-06-14 1998-05-12 Paul Wurth S.A. Suspension device for a rotating body
US20050236790A1 (en) * 2002-03-22 2005-10-27 Carter William S Wheeled arrangement
US9636610B2 (en) * 2010-05-07 2017-05-02 Metalquima, S.A. Brine filtering device, applied to a meat product injection machine
US20130195602A1 (en) * 2010-07-09 2013-08-01 Esab Ab Roller bed with electrical clutch
US20130043179A1 (en) * 2011-08-19 2013-02-21 Peter J. Bugg Filtration tank with serially connected horizontal screens
US9511311B2 (en) * 2011-08-19 2016-12-06 Ovivo Inc. Filtration tank with serially connected horizontal screens
US9266246B2 (en) * 2012-12-31 2016-02-23 Spectrum Brands, Inc. Drive component for electric shaver
US20140182136A1 (en) * 2012-12-31 2014-07-03 Spectrum Brands, Inc. Drive Component For Electric Shaver
US20160045936A1 (en) * 2014-08-13 2016-02-18 Cp Manufacturing, Inc. Rotary Sorting Appartus
US9457380B2 (en) * 2014-08-13 2016-10-04 Cp Manufacturing, Inc. Rotary sorting apparatus

Also Published As

Publication number Publication date
GB1342389A (en) 1974-01-03
DE2013230B2 (de) 1973-03-29
SE367555B (xx) 1974-06-04
NL169426C (nl) 1982-07-16
DE2013230A1 (de) 1971-10-07
CA952040A (en) 1974-07-30
NL169426B (nl) 1982-02-16
NL7103073A (xx) 1971-09-21
FR2084914A5 (xx) 1971-12-17

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