US3828754A - Flywheel magneto ignition device with capacitor-thyristor ignition combined with generator - Google Patents

Flywheel magneto ignition device with capacitor-thyristor ignition combined with generator Download PDF

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Publication number
US3828754A
US3828754A US00284737A US28473772A US3828754A US 3828754 A US3828754 A US 3828754A US 00284737 A US00284737 A US 00284737A US 28473772 A US28473772 A US 28473772A US 3828754 A US3828754 A US 3828754A
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United States
Prior art keywords
ignition
coil
rotor
capacitor
thyristor
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US00284737A
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English (en)
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H Carlsson
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Svenska Electromagneter AB
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Svenska Electromagneter AB
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P1/00—Installations having electric ignition energy generated by magneto- or dynamo- electric generators without subsequent storage
    • F02P1/02—Installations having electric ignition energy generated by magneto- or dynamo- electric generators without subsequent storage the generator rotor being characterised by forming part of the engine flywheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P1/00—Installations having electric ignition energy generated by magneto- or dynamo- electric generators without subsequent storage
    • F02P1/08—Layout of circuits
    • F02P1/086—Layout of circuits for generating sparks by discharging a capacitor into a coil circuit

Definitions

  • a flywheel magneto ignition device with capacitorthyristor ignition combined with generator comprises a first component group for producing an ignition effect and a second component group for generating current for lighting and/or battery charging purposes, the first component group comprising a rotor having mounted therein permanent magnets the pole of which are arranged to coact with coils containing at least one coil core and intended for the capacitor-thyristor-ignition circuit, and the second component group comprising a system of coils provided with iron cores and fixedly mounted in a rotating magnetic field from a body corotating with the rotor in the first component group, the rotor and the corotating body being mechanically connected together but with the respective magnetic fields shielded from each other.
  • the generator current can normally be produced in direct combination with the ignition system by arranging one or more generator coils in the magnetic circuit of the flywheel.
  • inductive ignition is meant here the age old solution of arranging in the magnetic circuit of the flywheel an ignition coil having a primary and a secondary winding.
  • a mechanical breaker, over the breaker points of which a capacitor is connected in parallel, is actuated by a cam on the engine shaft to break the primary circuit of the ignition coil at maximum voltage levels in the primary circuit. In this way there is induced in the secondary circuit a high voltage with an operational voltage of 8-10 kV, wherewith spark is produced on the spark lug.
  • the generator coils can be arranged to advantage in the same geometric plane and in the same rotary magnetic field as the ignition coil (or coils), and when the generator coils are correctly designed and correctly arranged in the magnetic field in relation to the ignition coil, no disturbing effect from the generator coils on the ignition is obtained.
  • the generator power output is essentially'a question of the dimensioning of the generator portion.
  • the control element may be a mechanical device in the form of a breaker similar to the type used with inductive ignition systems, or may also comprise an electronic circuit including a thyristor, a diode and a trigger coil provided with an iron core.
  • the trigger coil is arranged in the rotating magnetic filed of the flywheel and opens and closes the diode by voltage signals induced in the coil under the influence of the magnetic field.
  • the capacitive ignition system enables the ignition power to be increased over the whole operating range of the engine.
  • the spark-over voltage in special spark plugs intended for this system is from l8-20 kV.
  • a thyristor controlled capacitive system obviates the use of mechanical interruption means, thereby eliminating problems such as wear and tear unavoidably incurred with such devices.
  • the use of capacitive ignition systems provided with trigger coil/thyristor as a control means instead of a purely mechanical switching element, has been found to present unexpected problems in combination with generator coils for producing lighting and charging currents.
  • the timing and magnitude of the control pulse from the trigger coil to the thyristor must be particularly accurately adjusted.
  • the control pulse is totally determined by the rotating magnetic field, the field must have a particularly high degree of stability
  • the capacitive ignition system has been developed with generator coils disposed in the same plane i.e., the same rotating magnetic field as the aforementioned charging coil and trigger coil for the thyristor.
  • it has been found extremely difficult to screen off to a sufficient extent (i.e., practically totally) the magnetic field variations caused by the generator coils from the magnetic field actuating the trigger coil.
  • a magnetic field common to all coils and located in a single plane is subjected to unavoidable variations in magnitude and direction (sense).
  • the object of the present invention is to eliminate these disadvantages and to construct and design the elements forming part of the flywheel magneto ignition device generator combination in a manner which affords significant advantages from the aspect of manufacture and servicing.
  • the device according to the invention which relates to a flywheel magneto ignition device, using a capacitor-thyristor ignition system, and generator combined, comprising a first component group for producing an ignition effect and a second component group for generating current for lighting and/or battery charging purposes.
  • the device is mainly characterized in that the first component group comprises a rotor having mounted therein permanent magnets the poles of which are arranged to coact with coils containing at least one coil core and intended for the capacitor-thyristor-ignition circuit, and
  • the second component group comprises a system of coils provided with iron cores and fixedly mounted in a rotating magnetic field from a body corotating with the rotor in said first component group, the rotor and the co-rotating body being mechanically connected together but with respect to respective magnetic fields shielded from each other.
  • FIG. 1 illustrates in vertical cross section a flywheel magneto ignition device in combination with a generator in accordance with the invention and employing a capacitor thyristor ignition system, the device being illustrated as housed in one half of the crankcase of an internal combustion engine (not shown).
  • FIG. 2 is a horizontal cross-sectional view, partly in elevation, of the flywheel magneto ignition device shown in FIG. 1, showing an E-shaped, laminated iron core provided with a charging coil, an ignition coil having a primary and a secondary winding, and a trigger coil.
  • FIG. 3 is a wiring diagram for the capacitor-thyristor ignition system according to the invention.
  • FIG. 4 diagrammatically illustrates in principle a rotor provided with a permanent magnet and intended for the ignition device illustrated in FIGS. 1 and 2, and
  • FIG. 6 is a charging curve in respect of the voltage created in the capacitor through the voltage pattern shown in FIG. 5 and a trigger pulse for opening and closing a thyristor in the circuit illustrated in FIG. 3.
  • a flywheel magneto ignition device is generally indicated with the reference numeral l, and a portion of one half of an engine crankcase is generally indicated with the reference numeral 2.
  • the ignition device has a flywheel 3, comprising a flywheel casing 6 securely attached to a hub 4 as by a weld joint 5 for example, and a rotor 8 securely mounted over the casing 6 with a plurality of bolts 7 for example.
  • the flywheel casing 6 is made from a ferromagnetic material, such as iron sheet, and has securely mounted along the periphery of an inner, generally cylindrical surface 9, a number of permanent magnets 10, the number of which can be varied to suit the generator power for which the device is dimensioned.
  • the permanent magnets are symmetrically arranged on the surface 9 and retained in the casing 6 by screws (not shown), which pass through the casing 6 from the outside thereof and are respectively screwed into pole shoes 11, so that the permanent magnets 10 are firmly clamped between the pole shoes 11 and the surface 9.
  • This screw joint is often strengthened with'an adhesive, of the thermosetting epoxy resin type for example.
  • a laminated stator 12 of dynamo sheet Attached firmly to the crankcase half 2 in substantially the same plane as the permanent magnets 10 is a laminated stator 12 of dynamo sheet, held in position by a number of screws 13.
  • the stator 12 has radially outwardly extending legs 14, which form cores for a pair of generator coils 15.
  • the permanent magnets 10 are magnetized in the direction shown in FIG. 2 with the references NS. and SN.
  • a magnetic field is created through the stator 12 and the flywheel casing 6, said field having the direction shown by the arrow P1 in FIG. 2.
  • the hub 4 has a frusto conical internal configurationrect angularorientation relative the shaft 16.
  • the rotor 8 is made of a non-magnetic material, such as aluminium, zinc, reinforced thermosetting resin or the like, and has arranged along an outer cylindrical surface 21 one or more permanent magnets 22 each having a pair of generally radially outwardly directed poles 23,24, the outer surfaces of which lie in plane with the cylindrical surface 21.
  • thermosetting resin e.g. epoxy resin, which also encloses the electronic components 32 forming part of the ignition system and described in more detail-hereinafter with reference to FIG. 3.
  • the ignition coil 29, which comprises a primary winding 33 and a secondary winding 34, the trigger coil 30 and the electronic components 32 are present as a compact unit in the form-of the block 31, which is particularly well protected, both mechanically and with respect to moisture attack.
  • Necessary cables, of an ignition cable 35 as shown in FIG. 2 are connected to terminals sealed in the block.
  • the laminated coil core 25 which is made from dynamo sheet, is attached by a pair of screws 36 to a preferably annular holder plate 37 which at one outer circular edge runs along a rim 38 arranged on the crankcase half 2 concentrically in relation to the shaft 16.
  • the holder plate 37 is mounted to the rim 38 with screws 39, the plate 37 being provided with a number of attachment slots 40 to enable the angular position of the coil core 25 to be adjusted relative the crankcase half 2 and thus also'relative to the position of a piston (not shown) in the internal combustion engine.
  • A. capacitor 42' hereinafter described with reference to FlG. 3, is mounted on the core 25 by means at least one screw 41 and a lug 41.
  • the core 25, the charging coil 27, the block 31 and the capacitor 42 form a complete unit comprising all the mechanical and technical elements which, together with the rotor 8, provide the necessary ignition voltage. Since the unit is secured to the holder plate 37 solely by the screws 36, it can readily be removed for servicing purposes.
  • the combined generator-flywheel magneto ignition device shown in FIGS. 1, 2 is totally contained within the crankcase half 2 and a cap 43 which is mounted to the rim 38 and which has a plastic or rubber grommet 44 for the ignition cable 35. Removal of the cap 43 provides direct access to all the principal elements of the ignition system for adjusting or servicing purposes.
  • the casing 6 can be arranged to co-act with a welded gear ring or annulus 47 against which a bendix drive mounted on a start motor spindle (not shown) can work when starting the engine electrically.
  • the elements and sequence of operations producing the ignition voltage are totally separated in respect of the magnetic field from the elements and operations producing the generator voltage.
  • the ferromagnetic flywheel casing 6 effectively shields the magnetic field outwardly from the permanent magnets 10 arranged within the casing and the non-magnetic rotor 8 is free from all tendency to attract the field from the permanent magnets 10. This means that no interference or disturbances from the generator portion caused, for example, by variations in load can affect the ignition elements, especially the trigger coil 30.
  • FIGS. 36 The mode of operation of the trigger coil and the other elements active in the ignition process is described with reference to FIGS. 36, in which where applicable with reference to FIGS. 1 and 2 like reference numerals are used to identify like elements.
  • FIG. 3 is a circuit diagram of the electrical elements active in the ignition process, i.e., the charging coil 27 with the iron core 26, the ignition coil 29 withthe primary winding 33 and the secondary winding 34, and the iron core 28.
  • FIG. 3 also illustrates the capacitor 42 and a first diode 48, which rectifies the a.c. voltage advanced from the charging coil 26 to the capacitor 42, and a second diode 49, which releases the first diode 48 from excessively high voltages from the negative halfwave of the charging coil.
  • a thyristor 50 Connected between the first diode 48 and the capacitor 42 is a thyristor 50 which is switched on and off in response to control signals from the trigger coil 30 also associated with the iron core 28.
  • a third diode 51 is connected between the trigger coil 30 and the thyristor 50.
  • a second line from each of the charging coil 27, the second diode 49, the thyristor 50, the trigger coil 30 and the primary winding 33 of the ignition coil 29 is connected to ground.
  • a shunt system 52 which includes a fixed resistance and optionally also a capacitor adapted for capacitive ignition systems for all sizes is connected from the ground connection to the thyristor 50 and the line passing therefrom to the third diode 51. Further, an output line from the secondary winding 34 on the ignition coil 29 is connected to an insulated central electrode on a spark plug 53, on which a second electrode is grounded.
  • FIG. 4 illustrates diagrammatically the changes in magnetic flux occurring in the coil core 25 when the permanent magnet 22, with its poles 23 and 24, arranged in the rotor 8 has passed by, the poles being marked with N and S respectively, to show the direction of magnetization.
  • the trigger coil 30 will send a control signal S (FIG. 6) a very short time after the capacitor has reached its full charging voltage Vl (FIG. 6).
  • Charging of the capacitor 42, triggering of the thyristor 50 and therewith discharging of the capacitor 42 with resulting-sparking on the spark plug 53 takes place in a very rapid-sequence determined by mechanically bound element positions and tuning between the trigger coil 30 and the thyristor 5 70, which sequence can in no way be influenced by I magnetic field disturbances from the generator. portion; As previously mentioned, this is a prerequisite of positive ignition.
  • the block 31 is a complete unit in which the electronic elements are wellprotected.
  • the 5 block 31 may also embody the charging coil 27, so that said coil is more hermetically sealed and better protected. All elements of the described device can be mass produced. It is also possible to use one and. the same flywheel magneto ignition device for single, double or multicylinder engines by arranging on the holder plate 37, FIGS. 1, 2, iron cores 25 with associatedcozoperating; elements in positions and numbers corresponding-to the number of cylinders and cylinder positions.
  • a combined magneto and generator device comprising:
  • a. means for producing an ignitioneffect for connection to a thyristor-capacitor ignition circuit said means. including (1) at least one charging coil and one. trigger coil each having a coil core,
  • generating means including (1) a ferromagnetic casing corotatably secured to said rotor in coaxial alignment, and with said rotor and its coacting coils disposed at one side thereof,
  • said ferromagnetic casing constituting a magnetic shield between said ignition effect means and said generating means.
  • said first-named coil core has arms defining an E-shape, one of said first-named coils being a charging coil disposed on a first of said arms, a second of said firstnamed coils being an ignition coil disposed on a second of said arms which, in the direction of rotor rotation, is behind said first arm, said ignition coil having a primary winding and a secondary winding, and a third of said first-named" coils being a trigger coil disposed on said second arm.
  • a combined device in which said trigger coil is disposed nearer said rotor than said ignition coil.
  • a capacitor-thyristor ignition system having a combineddevice according to claim 2 including a capacitor, a diode, a thyristor and a spark plug connected 7 8 to said secondary winding, said charging coil being contion coil, said trigger coil and a number of the elecnected first to charge 531d capacltor-through 531d dlode, tronic components in circuit therewith are cast in a s trigger.coil bging conneqed toprovide a Congo] block having the physical properties of thermosetting signal at said thyristor for discharging said capacltor through said primary winding of the ignition coil for resm to com'pnse a m shock'proof and mois thereby creating a spark on said spark plug.
  • tureproof unlt- I 5 A system according to claim 4 in which said igni- I g

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
US00284737A 1971-09-01 1972-08-30 Flywheel magneto ignition device with capacitor-thyristor ignition combined with generator Expired - Lifetime US3828754A (en)

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SE11081/71A SE367897B (sv) 1971-09-01 1971-09-01

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Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941111A (en) * 1973-09-10 1976-03-02 Syncro Corporation Ignition system
US3955550A (en) * 1974-08-13 1976-05-11 Aktiebolaget Svenska Elektromagneter Flywheel magneto ignition device with capacitor-thyristor ignition combined with generator
US3974817A (en) * 1974-07-18 1976-08-17 Colt Industries Operating Corporation Breakerless ignition control system
DE2618222A1 (de) * 1975-04-25 1976-11-04 Svenska Electromagneter Schaltungsanordnung fuer elektronische zuendanlagen
JPS52111312U (sv) * 1976-02-20 1977-08-24
US4160435A (en) * 1977-04-15 1979-07-10 Brunswick Corporation Alternator driven CD ignition with auxiliary power
US4188929A (en) * 1976-08-17 1980-02-19 Robert Bosch Gmbh Internal combustion engine magneto-type ignition system with electronically controlled spark advance
US4418296A (en) * 1980-11-15 1983-11-29 Robert Bosch Gmbh Magneto-generator for engine ignition systems
USRE31837E (en) * 1975-04-29 1985-02-26 R. E. Phelon Company, Inc. Single core condenser discharge ignition system
US4538586A (en) * 1983-12-21 1985-09-03 Textron, Inc. Capacitive discharge ignition with long spark duration
US4591746A (en) * 1984-04-04 1986-05-27 Hitachi, Ltd. Ignition signal generator for internal combustion engines
US4606305A (en) * 1983-12-20 1986-08-19 Tecumseh Products Company External magnet flywheel mounting
US5078101A (en) * 1989-02-27 1992-01-07 Outboard Marine Corporation Marine propulsion device internal combustion engine
US5214332A (en) * 1989-06-20 1993-05-25 Alpha Corporation Electric motor
US5313918A (en) * 1989-09-11 1994-05-24 Sem Ab Flywheel magneto arrangement
US6089026A (en) * 1999-03-26 2000-07-18 Hu; Zhimin Gaseous wave refrigeration device with flow regulator
US6186108B1 (en) * 1996-11-27 2001-02-13 Sanshin Kogyo Kabushiki Kaisha Ignition arrangement for engine
US6343596B1 (en) 1997-10-22 2002-02-05 Pc/Rc Products, Llc Fuel delivery regulator
US20070084444A1 (en) * 2003-09-10 2007-04-19 Bellistri James T Electronic fuel regulation system for small engines
US20070256668A1 (en) * 2003-09-10 2007-11-08 Bellistri James T Apparatus & process for controlling operation of an internal combustion having an electronic fuel regulation system
US20090101630A1 (en) * 2007-10-17 2009-04-23 Illinois Tool Works Inc. Engine-Generator Without Flywheel
CN108691712A (zh) * 2017-04-03 2018-10-23 百力通公司 在低rpm下的点火线圈升压
US20190143438A1 (en) * 2017-11-13 2019-05-16 Illinois Tool Works Inc. Engine driven generator for providing welding power
CN109845079A (zh) * 2016-10-12 2019-06-04 马勒电驱动日本株式会社 磁铁发电机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3435265A (en) * 1967-01-03 1969-03-25 Brunswick Corp Housing and mounting for ignition trigger circuit
US3495579A (en) * 1967-06-12 1970-02-17 Espanola Magnetos Fab Electronic ignition system with lighting
US3498281A (en) * 1968-08-23 1970-03-03 Briggs & Stratton Corp Small engine capacitor discharge ignition system
US3545420A (en) * 1968-11-27 1970-12-08 Motorola Inc Capacitor discharge ignition system
US3623467A (en) * 1969-11-24 1971-11-30 Phelon Co Inc Triggering magnet and coil assembly for use with an ignition system including a permanent magnet alternator
US3673490A (en) * 1970-09-29 1972-06-27 Phelon Co Inc Combined alternator and ignition trigger signal generator with arrangement for suppressing spurious trigger signals
US3678913A (en) * 1969-07-25 1972-07-25 Bosch Gmbh Robert Current generator and electronic ignition circuit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3435265A (en) * 1967-01-03 1969-03-25 Brunswick Corp Housing and mounting for ignition trigger circuit
US3495579A (en) * 1967-06-12 1970-02-17 Espanola Magnetos Fab Electronic ignition system with lighting
US3498281A (en) * 1968-08-23 1970-03-03 Briggs & Stratton Corp Small engine capacitor discharge ignition system
US3545420A (en) * 1968-11-27 1970-12-08 Motorola Inc Capacitor discharge ignition system
US3678913A (en) * 1969-07-25 1972-07-25 Bosch Gmbh Robert Current generator and electronic ignition circuit
US3623467A (en) * 1969-11-24 1971-11-30 Phelon Co Inc Triggering magnet and coil assembly for use with an ignition system including a permanent magnet alternator
US3673490A (en) * 1970-09-29 1972-06-27 Phelon Co Inc Combined alternator and ignition trigger signal generator with arrangement for suppressing spurious trigger signals

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941111A (en) * 1973-09-10 1976-03-02 Syncro Corporation Ignition system
US3974817A (en) * 1974-07-18 1976-08-17 Colt Industries Operating Corporation Breakerless ignition control system
US3955550A (en) * 1974-08-13 1976-05-11 Aktiebolaget Svenska Elektromagneter Flywheel magneto ignition device with capacitor-thyristor ignition combined with generator
DE2618222A1 (de) * 1975-04-25 1976-11-04 Svenska Electromagneter Schaltungsanordnung fuer elektronische zuendanlagen
USRE31837E (en) * 1975-04-29 1985-02-26 R. E. Phelon Company, Inc. Single core condenser discharge ignition system
JPS52111312U (sv) * 1976-02-20 1977-08-24
US4188929A (en) * 1976-08-17 1980-02-19 Robert Bosch Gmbh Internal combustion engine magneto-type ignition system with electronically controlled spark advance
US4160435A (en) * 1977-04-15 1979-07-10 Brunswick Corporation Alternator driven CD ignition with auxiliary power
US4418296A (en) * 1980-11-15 1983-11-29 Robert Bosch Gmbh Magneto-generator for engine ignition systems
US4606305A (en) * 1983-12-20 1986-08-19 Tecumseh Products Company External magnet flywheel mounting
US4538586A (en) * 1983-12-21 1985-09-03 Textron, Inc. Capacitive discharge ignition with long spark duration
US4591746A (en) * 1984-04-04 1986-05-27 Hitachi, Ltd. Ignition signal generator for internal combustion engines
US5078101A (en) * 1989-02-27 1992-01-07 Outboard Marine Corporation Marine propulsion device internal combustion engine
US5214332A (en) * 1989-06-20 1993-05-25 Alpha Corporation Electric motor
US5313918A (en) * 1989-09-11 1994-05-24 Sem Ab Flywheel magneto arrangement
US6186108B1 (en) * 1996-11-27 2001-02-13 Sanshin Kogyo Kabushiki Kaisha Ignition arrangement for engine
US6343596B1 (en) 1997-10-22 2002-02-05 Pc/Rc Products, Llc Fuel delivery regulator
US6089026A (en) * 1999-03-26 2000-07-18 Hu; Zhimin Gaseous wave refrigeration device with flow regulator
US7798128B2 (en) 2003-09-10 2010-09-21 Pc/Rc Products, L.L.C. Apparatus and process for controlling operation of an internal combustion engine having an electronic fuel regulation system
US20070256668A1 (en) * 2003-09-10 2007-11-08 Bellistri James T Apparatus & process for controlling operation of an internal combustion having an electronic fuel regulation system
US20070084444A1 (en) * 2003-09-10 2007-04-19 Bellistri James T Electronic fuel regulation system for small engines
US20090101630A1 (en) * 2007-10-17 2009-04-23 Illinois Tool Works Inc. Engine-Generator Without Flywheel
US9065305B2 (en) * 2007-10-17 2015-06-23 Illinois Tool Works Inc. Engine-generator without flywheel
CN109845079A (zh) * 2016-10-12 2019-06-04 马勒电驱动日本株式会社 磁铁发电机
US11088605B2 (en) * 2016-10-12 2021-08-10 Mahle Electric Drives Japan Corporation Magnet generator with resin-made ceiling
CN109845079B (zh) * 2016-10-12 2021-08-24 马勒电驱动日本株式会社 磁铁发电机
CN108691712A (zh) * 2017-04-03 2018-10-23 百力通公司 在低rpm下的点火线圈升压
US20190143438A1 (en) * 2017-11-13 2019-05-16 Illinois Tool Works Inc. Engine driven generator for providing welding power
US10875118B2 (en) * 2017-11-13 2020-12-29 Illinois Tool Works Inc. Engine driven generator for providing welding power

Also Published As

Publication number Publication date
SE367897B (sv) 1974-06-10

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