US3871714A - Fluid motor drive for lifting device such as a winch with accumulated pressure starting after brake release - Google Patents

Fluid motor drive for lifting device such as a winch with accumulated pressure starting after brake release Download PDF

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Publication number
US3871714A
US3871714A US382019A US38201973A US3871714A US 3871714 A US3871714 A US 3871714A US 382019 A US382019 A US 382019A US 38201973 A US38201973 A US 38201973A US 3871714 A US3871714 A US 3871714A
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US
United States
Prior art keywords
pressure
brake
motor
accumulator
pump
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
US382019A
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English (en)
Inventor
Volkmar Behrend
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.)
CNH Industrial Baumaschinen GmbH
Original Assignee
O&K Orenstein and Koppel GmbH
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F16H39/00—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution
    • F16H39/02—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motors at a distance from liquid pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/24—Operating devices
    • B66D5/26—Operating devices pneumatic or hydraulic
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/3023—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure
    • F16H63/3026—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure comprising friction clutches or brakes
    • F16H2063/3033—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure comprising friction clutches or brakes the brake is actuated by springs and released by a fluid pressure
    • 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
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/4157—Control of braking, e.g. preventing pump over-speeding when motor acts as a pump
    • 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
    • Y10S60/00—Power plants
    • Y10S60/905—Winding and reeling

Definitions

  • a fluid pressure drive system for rotating a lifting device such as a winch includes a fluid motor having a drive shaft adapted to be connected to the winch which is engaged by a brake which may be actuated to stop the shaft by biasing means such as a spring.
  • the fluid motor is driven by a pump which has a fluid pressure discharge connected to the motor which is also connected through a line to an accumulator.
  • the accumulator is charged with the pump operating pressure through a one way valve so that the accumulator stores the operating pressure during the operation of the motor to move the winch.
  • the brake is released by forcing a fluid piston against the force of its biasing means to a releasing direction under the influence of actuating pressure which is supplied from a separate actuating pressure source.
  • the actuating pressure source is connected through a control valve to a throttle and to a fluid pressure cylinder in which the fluid pressure piston which actuates the brake is movable.
  • the control valve is set so that the cylinder is vented to the atmosphere so that the biasing means may press the piston into an operative or brake engagement position.
  • the control member When the pump driving the fluid motor which operates the winch is stopped the control member is actuated to provide an actuating pressure connection through the throttle and to the control cylinder but also to a release valve for the accumulator pressure which is first connected to the line connected between the pump discharge and the motor to insure that the motor is held under operating pressure.
  • the throttle in the line between the valve control and the brake control cylinder is set to regulate the pressure to the brake control cylinder in order that the brake may be released only after the accumulator pressure is communicated to the drive motor in order to insure that the drive motor is not subjected to the immediate loading of the winch would would cause a rapid unwinding of the winch.
  • a fluid motor actuated drive for a winch in which the shaft of the fluid motor is engaged by a brake which is actuated only after an accumulator which stores pres sure at operating pressure of the pump is connected into the pressure line between the pump and the.drive motor.
  • an accumulator which stores pres sure at operating pressure of the pump is connected into the pressure line between the pump and the.drive motor.
  • a throttle is interposed in an actuating pressure line leading to a brake control cylinder having a movable brake operating piston therein.
  • the throttle regulates the flow of actuating pressure to the piston for the release of the brake and insures a flow to a control valve for an accumulator to insure that the accumulator discharges into the pressure line connected between the pump and the drive motor to maintain the drive motor under operating pressure.
  • the throttle member insures a delay of the actuation of the brake until the accumulator pressure is connected behind the drive motor.
  • the throttle can be adjustable in order to regulate the delay in accordance with operating conditions.
  • an improved fluid motor driven lifting device such as a winch which includes a fluid motor having a drive shaft which is engaged by a braking member which is released by an actuating pressure which is also employed to control the release of an accumulator pressure behind the drive motor before the brake is fully released.
  • a further object of the invention is to provide a fluid motor driven lifting device such as a winch which is simple in design, rugged in construction and economical to manufacture.
  • FIGURE of the drawing is a schematic representation of a hydraulic control system for a fluid motor driven winch constructed inaccordance with the invention.
  • the invention in particular the invention embodied therein comprises a drive for a lifting winch which includes a hydraulic pump 1 having a discharge line or high pressure conduit 2 which is connected to a hydraulic motor 3 and a return conduit 4 which connects back to the pump 1.
  • the fluid motor 3 has a drive shaft 5 which is connected through gearing inside of a winch drum 6 to operate, that is rotate the drum 6.
  • a brake mechanism generally designated. 7 includes a brake disk 20 carried on the shaft 5 which is braked by a surrounding brake shoe 20 which is actuated by a braking piston 22 which is movable in a brake control cylinder 24. Biasing meansin the form of a spring 26 acts on the piston 22 to hold it in a braking position in which the shaft 5 will be stopped.
  • means are provided to supply an operating fluid pressure to the pressure line 2 before the brake is released and before the piston 22 is moved against the biasing spring 26 to effect such release.
  • These means include an accumulator 10 which is connected through an accumulator pressure line 8 to the fluid pressure line 2.
  • the accumulator pressure line 8 includes a combination pressure release valve and check valve 9 which includes a check valve portion 9a which permits the accumulation of an operating pressure in the accumulator 10 by flow from the pressure line 2 through the accumulator pressure line 8 to the accumulator 10 during operation of the pump 1.
  • An actuating pressure source 28 is connected to a control valve for the actuating pressure 14 which in turn is connected through an actuating pressure line 11 to the control cylinder 24.
  • the actuating pressure line 11 contains a throttle valve control 12 which provides an adjustable pressure control delay in communicating an actuating pressure to the fluid control cylinder 24.
  • a by-pass line 12a is provided in the line 11 which permits a pressure relief from the control cylinder 24 through the control valve 14 and to a sump 30 when the brake is actuated and the shaft 5 is stopped.
  • the pump motor 32 is advantageously electrically connected to the actuating pressure source 28 through a connection 34 and also through a connecting line 36 to the control valve 14.
  • the valve 14 is adjusted electrically to connect the actuating pressure source to the pressure line 11 and the control line 13.
  • the control cylinder 24 is connected through the pressure line 11 back through the control valve 14 to the sump 3 and this permits actuation of the brake piston 22 by the biasing means 26.
  • the throttle 12 comprises a delay device for delaying the communication of the actuating pressure to the brake control cylinder 24 but any suitable delay device may be provided for this purpose.
  • the delay device has the effect that the brake comes into action with an adjustable time delay after the delivery volume of the pump 1 drops to zero.
  • the hydraulic pump] is switched off at which time the holding brake mechanism 7 is brought into action with some delay.
  • the load then will remain at the same height and will not suddenly drop due to the unwinding of the winch drum 6.
  • the pressure in the high pressure conduit 2 falls below the load pressure but the releasable non return valve 9 closes so that the operating pressure is stored in the accumulator 10 which corresponds to the load pressure which was previously prevailing.
  • the releaseable non return valve 9 is first opened to communicate the accumulator pressure 10 to the fluid motor 3 so that it will be backed up by a pressure corresponding to the load pressure. Thereafter the brake is released and the hydraulic motor 1 is again brought into action without any undesirable sinking of the load.
  • a fluid motor driven system for driving a rotatable shaft adapted to be connected to a load which is lifted and which has an actuating pressure source, a brake for stopping the shaft which is actuated by an actuating pressure source and in which a pump provides a fluid pressure discharge into a line connected to operate a fluid motor to drive the shaft
  • the improvement comprising an accumulator connected to the connection between the pump and the motor with means in said connection for permitting the actuating pressure source to be communicated to said accumulator, and an actuating pressure connection from the actuating pressure source to the brake for operating the brake and to the accumulator for operating the accumulator to connect the accumulator to the fluid motor before the brake is released.
  • a fluid drive system for a winch and similar lifting device comprising a fluid drive motor having a drive shaft adapted to be connected to the lifting device, a brake connected to said drive shaft having a brake applying member which is engageable with said shaft for stopping said shaft, a brake control cylinder, a piston slidable in said control cylinder and engaged with said brake applying member for actuating said member to stop said shaft, means biasing said piston from one side of said cylinder to engage said brake applying member to stop said shaft, said piston being shiftable by brake actuating pressure against said biasing means, a control cylinder pressure line connected to said brake cylinder on the side opposite to said biasing means, an adjustable throttle member in said pressure line, a fluid drive pump having a pump discharge connected to said drive motor to drive said drive motor to rotate said shaft, a pressure accumulator having a pressure release valve connected to said pressure line for actuation by pressure therein, an accumulator pressure line connected from said accumulator to the communication between said pump discharge and said motor to supply accumulator pressure to said motor before
  • a drive according to claim 2, wherein said pressure release valve comprises a releasable non return valve permitting flow from the connection between said pump 'and said fluid motor to said accumulator during operation of said pump.
  • valve control is connected to said actuating pressure source and to an electric motor for driving said pump and including an electric motor connected to said pump for driving said pump, said release valve having a branch connection to said section between said valve control and said brake control cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Braking Arrangements (AREA)
US382019A 1972-08-19 1973-07-23 Fluid motor drive for lifting device such as a winch with accumulated pressure starting after brake release Expired - Lifetime US3871714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2240940A DE2240940C3 (de) 1972-08-19 1972-08-19 Hydrostatisches Getriebe, insbesondere für Winden, Hubwinden, Wippwerkswinden o.dgl

Publications (1)

Publication Number Publication Date
US3871714A true US3871714A (en) 1975-03-18

Family

ID=5854057

Family Applications (1)

Application Number Title Priority Date Filing Date
US382019A Expired - Lifetime US3871714A (en) 1972-08-19 1973-07-23 Fluid motor drive for lifting device such as a winch with accumulated pressure starting after brake release

Country Status (12)

Country Link
US (1) US3871714A (hu)
JP (1) JPS4958552A (hu)
CA (1) CA985985A (hu)
DE (1) DE2240940C3 (hu)
ES (1) ES417839A1 (hu)
FR (1) FR2196696A5 (hu)
GB (1) GB1415767A (hu)
IE (1) IE38051B1 (hu)
IT (1) IT992227B (hu)
NL (1) NL7310114A (hu)
SE (1) SE392957B (hu)
ZA (1) ZA735489B (hu)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967736A (en) * 1974-11-21 1976-07-06 Bush Manufacturing Company Boom control system
US4017217A (en) * 1976-02-26 1977-04-12 Westinghouse Electric Corporation Overspeed protection system
US4026107A (en) * 1974-11-23 1977-05-31 Osrodek Badawczo-Rozwojowy Przemyslu Budowy Urzaszen Chemicznych "Cebea" Electrohydraulic press drive system
US4175389A (en) * 1978-02-06 1979-11-27 Samuel Shiber Hydromechanical transmission
DE3127439A1 (de) * 1980-07-14 1982-04-08 Bryne Mek. Verksted A/S, 4340 Bryne Ventilanordnung
WO1984000334A1 (en) * 1982-07-12 1984-02-02 Caterpillar Tractor Co Brake control system with metering pump relief
US4447044A (en) * 1980-05-26 1984-05-08 Kabushiki Kaisha Komatsu Seisakusho Clutching and braking control for hydraulically driven crane winches
US4448398A (en) * 1982-03-01 1984-05-15 Garlock Equipment Company Winch control system
US4458791A (en) * 1982-07-12 1984-07-10 Caterpillar Tractor Co. Brake control system with metering pump relief
US4534598A (en) * 1983-04-22 1985-08-13 Fmc Corporation Hydraulic disk brake circuit for crane draw works
US4665696A (en) * 1984-04-18 1987-05-19 Dynamic Hydraulic Systems, Inc. Hydraulically operated hoist for containerized freight or the like
US5002345A (en) * 1986-03-06 1991-03-26 Alfred Teves Gmbh Hydraulic brake system for automotive vehicles
US5002259A (en) * 1987-12-22 1991-03-26 Helper Winch, Inc. Power winch system
EP0850871A2 (de) * 1996-12-27 1998-07-01 Kässbohrer Geländefahrzeug GmbH Verfahren zum Betreiben einer Winde und zugehörige Vorrichtung
US5806838A (en) * 1995-11-30 1998-09-15 Kalve; Atle Hydraulic system for driving a winch during quartering and lifting modes
US6012707A (en) * 1995-05-19 2000-01-11 Tamrock Oy Arrangement for controlling tension in a winch cable connected to rock drilling equipment
US20070221419A1 (en) * 2006-03-27 2007-09-27 Willis Douglas G Detachable drive unit for mobile carriage
US20110215285A1 (en) * 2010-03-08 2011-09-08 Wizard Products, Llc Gas powered self contained portable winch
RU2446090C1 (ru) * 2010-10-06 2012-03-27 Государственное образовательное учреждение высшего профессионального образования "Саратовский государственный технический университет" (СГТУ) Механизм подъема груза
US20140091268A1 (en) * 2012-09-28 2014-04-03 Parker-Hannifin Corporation Constant Pull Winch Controls
CN105351266A (zh) * 2015-12-02 2016-02-24 北华航天工业学院 一种高性能矿用提升机液压控制系统
US9663335B2 (en) 2014-08-27 2017-05-30 Caterpillar Inc. Hydraulic winch control system and method
US9908757B2 (en) 2010-03-08 2018-03-06 Wizard Products, Llc Gas powered self contained portable winch
US20220297991A1 (en) * 2019-09-12 2022-09-22 Kobelco Construction Machinery Co., Ltd. Work machine

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5279457A (en) * 1975-12-26 1977-07-04 Ebara Corp Overrun preventing device of dual speed switching type freight handlin g winch
JPS5842592A (ja) * 1981-08-31 1983-03-12 新明和工業株式会社 クレ−ン車のウインチ用制御装置
DE102005060992A1 (de) * 2005-12-20 2007-06-28 Bosch Rexroth Aktiengesellschaft Hydrostatischer Antrieb mit Rückgewinnug von Bremsenergie
CN102155440A (zh) * 2011-04-06 2011-08-17 上海朝田实业有限公司 一种液压泵站的液压节能电机装置
CN102155441A (zh) * 2011-04-06 2011-08-17 上海朝田实业有限公司 一种液压泵站的液压节能泵装置
FR3002991B1 (fr) * 2013-03-08 2015-04-03 Poclain Hydraulics Ind Circuit hydraulique comprenant une commande de freinage statique temporisee
CN103486094B (zh) * 2013-10-12 2016-08-24 徐州重型机械有限公司 一种起重机及其卷扬马达液压控制系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2459663A (en) * 1944-12-11 1949-01-18 Warner Aircraft Corp Hydraulic braking system
US2576359A (en) * 1949-10-08 1951-11-27 Tracy J Putnam Hoist control mechanism
US2827763A (en) * 1955-05-20 1958-03-25 Jaroco Engineering Co Hydraulic system
US3249336A (en) * 1963-06-18 1966-05-03 Baldwin Lima Hamilton Corp Hydraulic winch control mechanism
US3439579A (en) * 1966-05-13 1969-04-22 Poclain Sa Device for releasing or producing hydraulic pressure in a chamber
US3764111A (en) * 1971-10-26 1973-10-09 Bucyrus Erie Co Free fall circuit for hydraulic winch

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2459663A (en) * 1944-12-11 1949-01-18 Warner Aircraft Corp Hydraulic braking system
US2576359A (en) * 1949-10-08 1951-11-27 Tracy J Putnam Hoist control mechanism
US2827763A (en) * 1955-05-20 1958-03-25 Jaroco Engineering Co Hydraulic system
US3249336A (en) * 1963-06-18 1966-05-03 Baldwin Lima Hamilton Corp Hydraulic winch control mechanism
US3439579A (en) * 1966-05-13 1969-04-22 Poclain Sa Device for releasing or producing hydraulic pressure in a chamber
US3764111A (en) * 1971-10-26 1973-10-09 Bucyrus Erie Co Free fall circuit for hydraulic winch

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967736A (en) * 1974-11-21 1976-07-06 Bush Manufacturing Company Boom control system
US4026107A (en) * 1974-11-23 1977-05-31 Osrodek Badawczo-Rozwojowy Przemyslu Budowy Urzaszen Chemicznych "Cebea" Electrohydraulic press drive system
US4017217A (en) * 1976-02-26 1977-04-12 Westinghouse Electric Corporation Overspeed protection system
US4175389A (en) * 1978-02-06 1979-11-27 Samuel Shiber Hydromechanical transmission
US4447044A (en) * 1980-05-26 1984-05-08 Kabushiki Kaisha Komatsu Seisakusho Clutching and braking control for hydraulically driven crane winches
DE3127439A1 (de) * 1980-07-14 1982-04-08 Bryne Mek. Verksted A/S, 4340 Bryne Ventilanordnung
US4448398A (en) * 1982-03-01 1984-05-15 Garlock Equipment Company Winch control system
WO1984000334A1 (en) * 1982-07-12 1984-02-02 Caterpillar Tractor Co Brake control system with metering pump relief
US4458791A (en) * 1982-07-12 1984-07-10 Caterpillar Tractor Co. Brake control system with metering pump relief
US4534598A (en) * 1983-04-22 1985-08-13 Fmc Corporation Hydraulic disk brake circuit for crane draw works
US4665696A (en) * 1984-04-18 1987-05-19 Dynamic Hydraulic Systems, Inc. Hydraulically operated hoist for containerized freight or the like
US5002345A (en) * 1986-03-06 1991-03-26 Alfred Teves Gmbh Hydraulic brake system for automotive vehicles
US5002259A (en) * 1987-12-22 1991-03-26 Helper Winch, Inc. Power winch system
US6012707A (en) * 1995-05-19 2000-01-11 Tamrock Oy Arrangement for controlling tension in a winch cable connected to rock drilling equipment
US5806838A (en) * 1995-11-30 1998-09-15 Kalve; Atle Hydraulic system for driving a winch during quartering and lifting modes
EP0850871A3 (de) * 1996-12-27 2000-04-12 Kässbohrer Geländefahrzeug AG Verfahren zum Betreiben einer Winde und zugehörige Vorrichtung
EP0850871A2 (de) * 1996-12-27 1998-07-01 Kässbohrer Geländefahrzeug GmbH Verfahren zum Betreiben einer Winde und zugehörige Vorrichtung
US20070221419A1 (en) * 2006-03-27 2007-09-27 Willis Douglas G Detachable drive unit for mobile carriage
US9908757B2 (en) 2010-03-08 2018-03-06 Wizard Products, Llc Gas powered self contained portable winch
US20110215285A1 (en) * 2010-03-08 2011-09-08 Wizard Products, Llc Gas powered self contained portable winch
US8434742B2 (en) 2010-03-08 2013-05-07 Wizard Products, Llc Gas powered self contained portable winch
RU2446090C1 (ru) * 2010-10-06 2012-03-27 Государственное образовательное учреждение высшего профессионального образования "Саратовский государственный технический университет" (СГТУ) Механизм подъема груза
US20140091268A1 (en) * 2012-09-28 2014-04-03 Parker-Hannifin Corporation Constant Pull Winch Controls
US9908756B2 (en) * 2012-09-28 2018-03-06 Parker-Hannifin Corporation Constant pull winch controls
US9663335B2 (en) 2014-08-27 2017-05-30 Caterpillar Inc. Hydraulic winch control system and method
CN105351266B (zh) * 2015-12-02 2017-07-14 北华航天工业学院 一种高性能矿用提升机液压控制系统
CN105351266A (zh) * 2015-12-02 2016-02-24 北华航天工业学院 一种高性能矿用提升机液压控制系统
US20220297991A1 (en) * 2019-09-12 2022-09-22 Kobelco Construction Machinery Co., Ltd. Work machine
US12006193B2 (en) * 2019-09-12 2024-06-11 Kobelco Construction Machinery Co., Ltd. Work machine

Also Published As

Publication number Publication date
CA985985A (en) 1976-03-23
DE2240940A1 (de) 1974-03-07
IE38051B1 (en) 1977-12-07
DE2240940C3 (de) 1975-11-06
DE2240940B2 (de) 1974-12-19
GB1415767A (en) 1975-11-26
SE392957B (sv) 1977-04-25
IE38051L (en) 1974-02-19
FR2196696A5 (hu) 1974-03-15
AU5911173A (en) 1975-02-13
ES417839A1 (es) 1976-02-16
NL7310114A (hu) 1974-02-21
IT992227B (it) 1975-09-10
JPS4958552A (hu) 1974-06-06
ZA735489B (en) 1974-08-28

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