US3751183A - Interblade baffle and damper - Google Patents

Interblade baffle and damper Download PDF

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Publication number
US3751183A
US3751183A US00204049A US3751183DA US3751183A US 3751183 A US3751183 A US 3751183A US 00204049 A US00204049 A US 00204049A US 3751183D A US3751183D A US 3751183DA US 3751183 A US3751183 A US 3751183A
Authority
US
United States
Prior art keywords
damper
baffle
blades
connecting member
assembly
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
US00204049A
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English (en)
Inventor
H Nichols
H Mason
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.)
General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US3751183A publication Critical patent/US3751183A/en
Anticipated expiration legal-status Critical
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S416/00—Fluid reaction surfaces, i.e. impellers
    • Y10S416/50—Vibration damping features

Definitions

  • a baffle and damper assembly includes end plates for closing the opening between adjacent blade shanks, a connecting member extending between the end plates, retaining means to lock the assembly to its adjacent blades against the urging of centrifugal force, and at least one damper weight movably secured to the connecting member and adapted to bear against the blade platforms under the urging of centrifugal force.
  • This invention relates to turbomachinery and, more particularly, to a combined damping and sealing arrangement for use in turbomachinery rotor assemblies.
  • the invention herein described was made in the course of or under a contract, or a subcontract thereunder, with the United States Department of the Air Force.
  • turbomachinery rotor assemblies of the type having a plurality of blades extending radially from a rotor wheel or disc, it is generally important that a seal be provided between the wheel rim and the blade platform to reduce fluid leakage axially across the wheel, so as to forestall efficiency loss of the turbomachine.
  • US. Pat. No. 3,112,915 assigned to the assignee of this application, discloses a rotor assembly air baffle which includes axially spaced end plates which are interconnected by axially extending connecting members.
  • the end plates close the space between adjacent blade shanks while one of the connecting members is suitably shaped so as to bear against the underside of weight of the baffle increases, the baffle may, under the urging of centrifugal force, assume a fixed position against one or both of the blade platforms. When this occurs, the damping function is lost or substantially dimished and, from a vibration standpoint, the baffle acts as an integral part of one or both of the blades.
  • This invention is concerned with an improved air baffle structure which retains the advantageous features of the above-mentioned patent while avoiding the foregoing problem.
  • One object of this invention is to provide an improved sealing and blade damping structure for use in a turbomachinery rotor assembly.
  • Another object of this invention is to provide an air baffle for sealing between adjacent turbomachinery blade shanks which carries at least one damper weight which is movably affixed thereto and is adapted to bear against the adjacent blade platform, under the urging of centrifugal force, and clamp vibration through the mechanism of heat-producing relative slip.
  • a baffle and damper assembly comprising spaced, axially facingend plates sized to generally close the opening between adjacent blade shanks in a turbomachinery rotor assembly, with a connecting member extending between and joining the end plates.
  • Support means in the form of dovetails, are integrally formed with the connecting member adjacent each end plate and are sized for engagement with a dovetail slot which is cooperatively formed by oneor more axial corrugations projecting from each blade shank readily outwardly of the rotor disc periphery so as to retain the baffle and damper assembly against the urging of centrifugal force in the same manner that each blade is retained to the rotor disc.
  • One or more damper weights are movably or floatingly secured to the connecting member in a position where they will bear againstthe underside of the adjacent blade platforms to provide the desired damping through themechanism of heat-producing relative slip.
  • FIG. 2 is a cross-sectional view taken along lines 2- 2 of FIG. 1;
  • FIG. 4 is an enlarged partial cross-sectional view of the baffle and'damper assembly of this invention taken along lines 4+4 of FIG. 2.
  • a baffle and damper assembly 24 is provided between peripherally adjacent blades 14 to retard motive fluidleakage axially across the disc 12 in the area of thebladeshanks 19, and, at the same time,-to damp vibration between the blades 14 and between each blade 14 and the disc
  • each baffle and damper assembly 24 includes spaced, axially facing end plates 26, 28 which are interconnected by an axially extending connecting member 30.
  • the end plates 26 and 28, the connecting member 30 and the retaining means or dovetails 32 may be conveniently formed as an integral, cast member.
  • the damper weights 40 may be formed with the legs 48 separated as shown by the dotted lines of FIG. 4. With the legs 48 so formed, each weight may be secured to the connecting member 30 by simply bending the legs 48 toward each other until the tabs 46 engage the slot 50.
US00204049A 1971-12-02 1971-12-02 Interblade baffle and damper Expired - Lifetime US3751183A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20404971A 1971-12-02 1971-12-02

Publications (1)

Publication Number Publication Date
US3751183A true US3751183A (en) 1973-08-07

Family

ID=22756409

Family Applications (1)

Application Number Title Priority Date Filing Date
US00204049A Expired - Lifetime US3751183A (en) 1971-12-02 1971-12-02 Interblade baffle and damper

Country Status (8)

Country Link
US (1) US3751183A (fr)
JP (1) JPS5517204B2 (fr)
BE (1) BE791375A (fr)
CA (1) CA951644A (fr)
DE (1) DE2258604C2 (fr)
FR (1) FR2164196A5 (fr)
GB (1) GB1410607A (fr)
IT (1) IT971440B (fr)

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887298A (en) * 1974-05-30 1975-06-03 United Aircraft Corp Apparatus for sealing turbine blade damper cavities
US4088421A (en) * 1976-09-30 1978-05-09 General Electric Company Coverplate damping arrangement
US4101245A (en) * 1976-12-27 1978-07-18 United Technologies Corporation Interblade damper and seal for turbomachinery rotor
US4182598A (en) * 1977-08-29 1980-01-08 United Technologies Corporation Turbine blade damper
US4192633A (en) * 1977-12-28 1980-03-11 General Electric Company Counterweighted blade damper
US4279572A (en) * 1979-07-09 1981-07-21 United Technologies Corporation Sideplates for rotor disk and rotor blades
US4343594A (en) * 1979-03-10 1982-08-10 Rolls-Royce Limited Bladed rotor for a gas turbine engine
US4626169A (en) * 1983-12-13 1986-12-02 United Technologies Corporation Seal means for a blade attachment slot of a rotor assembly
EP0490522A1 (fr) * 1990-12-10 1992-06-17 General Electric Company Pièce d'étanchéité pour roue d'aubes de turbine
US5313786A (en) * 1992-11-24 1994-05-24 United Technologies Corporation Gas turbine blade damper
US5388962A (en) * 1993-10-15 1995-02-14 General Electric Company Turbine rotor disk post cooling system
US5478207A (en) * 1994-09-19 1995-12-26 General Electric Company Stable blade vibration damper for gas turbine engine
US5513955A (en) * 1994-12-14 1996-05-07 United Technologies Corporation Turbine engine rotor blade platform seal
US5573375A (en) * 1994-12-14 1996-11-12 United Technologies Corporation Turbine engine rotor blade platform sealing and vibration damping device
US5785499A (en) * 1996-12-24 1998-07-28 United Technologies Corporation Turbine blade damper and seal
US5827047A (en) * 1996-06-27 1998-10-27 United Technologies Corporation Turbine blade damper and seal
US5924699A (en) * 1996-12-24 1999-07-20 United Technologies Corporation Turbine blade platform seal
US6042336A (en) * 1998-11-25 2000-03-28 United Technologies Corporation Offset center of gravity radial damper
US6273683B1 (en) 1999-02-05 2001-08-14 Siemens Westinghouse Power Corporation Turbine blade platform seal
US6409472B1 (en) * 1999-08-09 2002-06-25 United Technologies Corporation Stator assembly for a rotary machine and clip member for a stator assembly
US20080181779A1 (en) * 2007-01-25 2008-07-31 Siemens Power Generation, Inc. Blade assembly in a combustion turbo-machine providing reduced concentration of mechanical stress and a seal between adjacent assemblies
US20100111700A1 (en) * 2008-10-31 2010-05-06 Hyun Dong Kim Turbine blade including a seal pocket
US20100158686A1 (en) * 2008-12-19 2010-06-24 Hyun Dong Kim Turbine blade assembly including a damper
WO2010099781A2 (fr) * 2009-03-05 2010-09-10 Mtu Aero Engines Gmbh Rotor pour turbomachine
US20100232938A1 (en) * 2009-03-12 2010-09-16 General Electric Company Gas Turbine Having Seal Assembly with Coverplate and Seal
DE102009011879A1 (de) * 2009-03-05 2010-09-16 Mtu Aero Engines Gmbh Integral beschaufelter Rotor und Verfahren zur Herstellung eines integral beschaufelten Rotors
US20100232939A1 (en) * 2009-03-12 2010-09-16 General Electric Company Machine Seal Assembly
US20100329873A1 (en) * 2009-06-25 2010-12-30 Daniel Ruba Retaining and sealing ring assembly
US20110027088A1 (en) * 2009-07-31 2011-02-03 General Electric Company Rotor blades for turbine engines
US20110052398A1 (en) * 2009-08-27 2011-03-03 Roy David Fulayter Fan assembly
US20110076148A1 (en) * 2009-09-30 2011-03-31 Roy David Fulayter Fan
US20110255973A1 (en) * 2010-04-16 2011-10-20 Mtu Aero Engines Gmbh Damping element and method for damping rotor blade vibrations, a rotor blade, and a rotor
EP2520768A1 (fr) * 2011-05-02 2012-11-07 MTU Aero Engines AG Dispositif étanche pour un corps de base de rotor à aubage intégral d'une turbomachine
GB2506225A (en) * 2012-06-04 2014-03-26 Snecma Turbine wheel and associated turbine engine
US20140119916A1 (en) * 2012-10-31 2014-05-01 Solar Turbines Incorporated Damper for a turbine rotor assembly
US20140119943A1 (en) * 2012-10-31 2014-05-01 Solar Turbines Incorporated Turbine rotor assembly
US20140119918A1 (en) * 2012-10-31 2014-05-01 Solar Turbines Incorporated Damper for a turbine rotor assembly
US20140119917A1 (en) * 2012-10-31 2014-05-01 Solar Turbines Incorporated Turbine blade for a gas turbine engine
US9279332B2 (en) 2012-05-31 2016-03-08 Solar Turbines Incorporated Turbine damper
US20160238034A1 (en) * 2015-02-17 2016-08-18 Rolls-Royce Corporation Fan assembly
US9650901B2 (en) 2012-05-31 2017-05-16 Solar Turbines Incorporated Turbine damper
US20180058236A1 (en) * 2016-08-23 2018-03-01 United Technologies Corporation Rim seal for gas turbine engine
US10975714B2 (en) * 2018-11-22 2021-04-13 Pratt & Whitney Canada Corp. Rotor assembly with blade sealing tab
RU2764565C1 (ru) * 2021-03-05 2022-01-18 Акционерное общество "Силовые машины - ЗТЛ, ЛМЗ, Электросила, Энергомашэкспорт" (АО "Силовые машины") Демпферное уплотнение рабочего колеса газовой турбины

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1549152A (en) * 1977-01-11 1979-08-01 Rolls Royce Rotor stage for a gas trubine engine
GB2043797A (en) * 1979-03-10 1980-10-08 Rolls Royce Bladed Rotor for Gas Turbine Engine
US4872810A (en) * 1988-12-14 1989-10-10 United Technologies Corporation Turbine rotor retention system
FR2669686B1 (fr) * 1990-11-28 1994-09-02 Snecma Rotor de soufflante avec aubes sans plates-formes et sabots reconstituant le profil de veine.
US5228835A (en) * 1992-11-24 1993-07-20 United Technologies Corporation Gas turbine blade seal
GB2344383B (en) 1998-12-01 2002-06-26 Rolls Royce Plc A bladed rotor
GB0109033D0 (en) 2001-04-10 2001-05-30 Rolls Royce Plc Vibration damping
EP2434098A1 (fr) * 2010-09-24 2012-03-28 Siemens Aktiengesellschaft Agencement d'aubes et turbine à gaz associée
FR2972482B1 (fr) * 2011-03-07 2016-07-29 Snecma Etage de turbine pour turbomachine d'aeronef, presentant une etancheite amelioree entre le flasque aval et les aubes de la turbine, par maintien mecanique
FR3096734B1 (fr) * 2019-05-29 2021-12-31 Safran Aircraft Engines Ensemble pour turbomachine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR989556A (fr) * 1949-06-25 1951-09-11 Cem Comp Electro Mec Perfectionnement aux aubes de turbo-machines
FR1263677A (fr) * 1960-07-29 1961-06-09 Havilland Engine Co Ltd Dispositif antivibratoire applicable à des organes rotatifs
US3112915A (en) * 1961-12-22 1963-12-03 Gen Electric Rotor assembly air baffle
US3181835A (en) * 1964-01-07 1965-05-04 Carroll C Davis Blade vibration damping device
US3266770A (en) * 1961-12-22 1966-08-16 Gen Electric Turbomachine rotor assembly
US3610778A (en) * 1968-08-09 1971-10-05 Sulzer Ag Support for rotor blades in a rotor
US3666376A (en) * 1971-01-05 1972-05-30 United Aircraft Corp Turbine blade damper

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119595A (en) * 1961-02-23 1964-01-28 Gen Electric Bladed rotor and baffle assembly

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR989556A (fr) * 1949-06-25 1951-09-11 Cem Comp Electro Mec Perfectionnement aux aubes de turbo-machines
FR1263677A (fr) * 1960-07-29 1961-06-09 Havilland Engine Co Ltd Dispositif antivibratoire applicable à des organes rotatifs
US3112915A (en) * 1961-12-22 1963-12-03 Gen Electric Rotor assembly air baffle
US3266770A (en) * 1961-12-22 1966-08-16 Gen Electric Turbomachine rotor assembly
US3181835A (en) * 1964-01-07 1965-05-04 Carroll C Davis Blade vibration damping device
US3610778A (en) * 1968-08-09 1971-10-05 Sulzer Ag Support for rotor blades in a rotor
US3666376A (en) * 1971-01-05 1972-05-30 United Aircraft Corp Turbine blade damper

Cited By (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3887298A (en) * 1974-05-30 1975-06-03 United Aircraft Corp Apparatus for sealing turbine blade damper cavities
US4088421A (en) * 1976-09-30 1978-05-09 General Electric Company Coverplate damping arrangement
US4101245A (en) * 1976-12-27 1978-07-18 United Technologies Corporation Interblade damper and seal for turbomachinery rotor
US4182598A (en) * 1977-08-29 1980-01-08 United Technologies Corporation Turbine blade damper
US4192633A (en) * 1977-12-28 1980-03-11 General Electric Company Counterweighted blade damper
US4343594A (en) * 1979-03-10 1982-08-10 Rolls-Royce Limited Bladed rotor for a gas turbine engine
US4279572A (en) * 1979-07-09 1981-07-21 United Technologies Corporation Sideplates for rotor disk and rotor blades
US4626169A (en) * 1983-12-13 1986-12-02 United Technologies Corporation Seal means for a blade attachment slot of a rotor assembly
EP0490522A1 (fr) * 1990-12-10 1992-06-17 General Electric Company Pièce d'étanchéité pour roue d'aubes de turbine
US5201849A (en) * 1990-12-10 1993-04-13 General Electric Company Turbine rotor seal body
US5313786A (en) * 1992-11-24 1994-05-24 United Technologies Corporation Gas turbine blade damper
US5388962A (en) * 1993-10-15 1995-02-14 General Electric Company Turbine rotor disk post cooling system
US5478207A (en) * 1994-09-19 1995-12-26 General Electric Company Stable blade vibration damper for gas turbine engine
US5513955A (en) * 1994-12-14 1996-05-07 United Technologies Corporation Turbine engine rotor blade platform seal
US5573375A (en) * 1994-12-14 1996-11-12 United Technologies Corporation Turbine engine rotor blade platform sealing and vibration damping device
US5827047A (en) * 1996-06-27 1998-10-27 United Technologies Corporation Turbine blade damper and seal
US5785499A (en) * 1996-12-24 1998-07-28 United Technologies Corporation Turbine blade damper and seal
US5924699A (en) * 1996-12-24 1999-07-20 United Technologies Corporation Turbine blade platform seal
US6042336A (en) * 1998-11-25 2000-03-28 United Technologies Corporation Offset center of gravity radial damper
US6273683B1 (en) 1999-02-05 2001-08-14 Siemens Westinghouse Power Corporation Turbine blade platform seal
US6409472B1 (en) * 1999-08-09 2002-06-25 United Technologies Corporation Stator assembly for a rotary machine and clip member for a stator assembly
US20080181779A1 (en) * 2007-01-25 2008-07-31 Siemens Power Generation, Inc. Blade assembly in a combustion turbo-machine providing reduced concentration of mechanical stress and a seal between adjacent assemblies
US7762780B2 (en) 2007-01-25 2010-07-27 Siemens Energy, Inc. Blade assembly in a combustion turbo-machine providing reduced concentration of mechanical stress and a seal between adjacent assemblies
US20100111700A1 (en) * 2008-10-31 2010-05-06 Hyun Dong Kim Turbine blade including a seal pocket
US8137072B2 (en) 2008-10-31 2012-03-20 Solar Turbines Inc. Turbine blade including a seal pocket
US8393869B2 (en) 2008-12-19 2013-03-12 Solar Turbines Inc. Turbine blade assembly including a damper
US8596983B2 (en) 2008-12-19 2013-12-03 Solar Turbines Inc. Turbine blade assembly including a damper
US20100158686A1 (en) * 2008-12-19 2010-06-24 Hyun Dong Kim Turbine blade assembly including a damper
DE102009011879A1 (de) * 2009-03-05 2010-09-16 Mtu Aero Engines Gmbh Integral beschaufelter Rotor und Verfahren zur Herstellung eines integral beschaufelten Rotors
WO2010099781A2 (fr) * 2009-03-05 2010-09-10 Mtu Aero Engines Gmbh Rotor pour turbomachine
WO2010099781A3 (fr) * 2009-03-05 2011-05-19 Mtu Aero Engines Gmbh Rotor pour turbomachine
US20100232938A1 (en) * 2009-03-12 2010-09-16 General Electric Company Gas Turbine Having Seal Assembly with Coverplate and Seal
US20100232939A1 (en) * 2009-03-12 2010-09-16 General Electric Company Machine Seal Assembly
US8696320B2 (en) 2009-03-12 2014-04-15 General Electric Company Gas turbine having seal assembly with coverplate and seal
US20100329873A1 (en) * 2009-06-25 2010-12-30 Daniel Ruba Retaining and sealing ring assembly
US8419370B2 (en) 2009-06-25 2013-04-16 Rolls-Royce Corporation Retaining and sealing ring assembly
US20110027088A1 (en) * 2009-07-31 2011-02-03 General Electric Company Rotor blades for turbine engines
US8371816B2 (en) 2009-07-31 2013-02-12 General Electric Company Rotor blades for turbine engines
US20110052398A1 (en) * 2009-08-27 2011-03-03 Roy David Fulayter Fan assembly
US8469670B2 (en) 2009-08-27 2013-06-25 Rolls-Royce Corporation Fan assembly
US8435006B2 (en) 2009-09-30 2013-05-07 Rolls-Royce Corporation Fan
US20110076148A1 (en) * 2009-09-30 2011-03-31 Roy David Fulayter Fan
US9074479B2 (en) * 2010-04-16 2015-07-07 Mtu Aero Engines Gmbh Damping element and method for damping rotor blade vibrations, a rotor blade, and a rotor
US20110255973A1 (en) * 2010-04-16 2011-10-20 Mtu Aero Engines Gmbh Damping element and method for damping rotor blade vibrations, a rotor blade, and a rotor
EP2520768A1 (fr) * 2011-05-02 2012-11-07 MTU Aero Engines AG Dispositif étanche pour un corps de base de rotor à aubage intégral d'une turbomachine
US9068466B2 (en) 2011-05-02 2015-06-30 Mtu Aero Engines Gmbh Sealing device, integrally bladed rotor basic body, and turbomachine
US9650901B2 (en) 2012-05-31 2017-05-16 Solar Turbines Incorporated Turbine damper
US9279332B2 (en) 2012-05-31 2016-03-08 Solar Turbines Incorporated Turbine damper
GB2506225A (en) * 2012-06-04 2014-03-26 Snecma Turbine wheel and associated turbine engine
GB2506225B (en) * 2012-06-04 2018-12-05 Snecma A turbine wheel in a turbine engine
CN104769223A (zh) * 2012-10-31 2015-07-08 索拉透平公司 用于涡轮机转子组件的阻尼器
US20140119916A1 (en) * 2012-10-31 2014-05-01 Solar Turbines Incorporated Damper for a turbine rotor assembly
US9228443B2 (en) * 2012-10-31 2016-01-05 Solar Turbines Incorporated Turbine rotor assembly
US20140119918A1 (en) * 2012-10-31 2014-05-01 Solar Turbines Incorporated Damper for a turbine rotor assembly
US9297263B2 (en) * 2012-10-31 2016-03-29 Solar Turbines Incorporated Turbine blade for a gas turbine engine
US9303519B2 (en) * 2012-10-31 2016-04-05 Solar Turbines Incorporated Damper for a turbine rotor assembly
US9347325B2 (en) * 2012-10-31 2016-05-24 Solar Turbines Incorporated Damper for a turbine rotor assembly
US20140119917A1 (en) * 2012-10-31 2014-05-01 Solar Turbines Incorporated Turbine blade for a gas turbine engine
US20140119943A1 (en) * 2012-10-31 2014-05-01 Solar Turbines Incorporated Turbine rotor assembly
US20160238034A1 (en) * 2015-02-17 2016-08-18 Rolls-Royce Corporation Fan assembly
US10156244B2 (en) * 2015-02-17 2018-12-18 Rolls-Royce Corporation Fan assembly
US20180058236A1 (en) * 2016-08-23 2018-03-01 United Technologies Corporation Rim seal for gas turbine engine
US10533445B2 (en) * 2016-08-23 2020-01-14 United Technologies Corporation Rim seal for gas turbine engine
US10975714B2 (en) * 2018-11-22 2021-04-13 Pratt & Whitney Canada Corp. Rotor assembly with blade sealing tab
RU2764565C1 (ru) * 2021-03-05 2022-01-18 Акционерное общество "Силовые машины - ЗТЛ, ЛМЗ, Электросила, Энергомашэкспорт" (АО "Силовые машины") Демпферное уплотнение рабочего колеса газовой турбины

Also Published As

Publication number Publication date
BE791375A (fr) 1973-03-01
CA951644A (en) 1974-07-23
DE2258604C2 (de) 1981-10-08
JPS5517204B2 (fr) 1980-05-09
GB1410607A (en) 1975-10-22
JPS4864303A (fr) 1973-09-06
FR2164196A5 (fr) 1973-07-27
IT971440B (it) 1974-04-30
DE2258604A1 (de) 1973-06-07

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