DE2327461A1 - HYDROPNEUMATIC PRESSURE ACCUMULATOR - Google Patents

HYDROPNEUMATIC PRESSURE ACCUMULATOR

Info

Publication number
DE2327461A1
DE2327461A1 DE2327461A DE2327461A DE2327461A1 DE 2327461 A1 DE2327461 A1 DE 2327461A1 DE 2327461 A DE2327461 A DE 2327461A DE 2327461 A DE2327461 A DE 2327461A DE 2327461 A1 DE2327461 A1 DE 2327461A1
Authority
DE
Germany
Prior art keywords
pressure accumulator
partition
edge reinforcement
annular bead
area
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.)
Pending
Application number
DE2327461A
Other languages
German (de)
Inventor
Wilhelm Gerhardt
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.)
HYDRAULIK ZUBEHOER GES fur
Original Assignee
HYDRAULIK ZUBEHOER GES fur
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HYDRAULIK ZUBEHOER GES fur filed Critical HYDRAULIK ZUBEHOER GES fur
Priority to DE2327461A priority Critical patent/DE2327461A1/en
Priority to US466007A priority patent/US3918497A/en
Priority to CA200,063A priority patent/CA1004110A/en
Priority to FR7418179A priority patent/FR2231901B1/fr
Priority to JP49060206A priority patent/JPS5842361B2/en
Priority to SE7407039A priority patent/SE408578B/en
Priority to GB2383974A priority patent/GB1477488A/en
Publication of DE2327461A1 publication Critical patent/DE2327461A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/12—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery
    • F15B1/14—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery by means of a rigid annular supporting member
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J12/00—Pressure vessels in general
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/04—Devices damping pulsations or vibrations in fluids
    • F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
    • F16L55/05—Buffers therefor
    • F16L55/052—Pneumatic reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3156—Accumulator separating means having flexible separating means characterised by their attachment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/43—Anti-extrusion means
    • F15B2201/435—Anti-extrusion means being fixed to the separating means

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Diaphragms And Bellows (AREA)

Description

DlPL-ING. H. FINK PATENTANWALT · 73OC1ESSLiNGhN(NECKAR)-HINDENBURGSTRASSEDlPL-ING. H. FINK PATENTANWALT · 73OC 1 ESSLiNGhN (NECKAR) -HINDENBURGSTRASSE

. Pot«ntonwall FINK · D730O Eulinpm (Neckar). Hind«nburg»tro6« 44 ·. Pot «ntonwall FINK · D730O Eulinpm (Neckar). Hind «nburg» tro6 «44 ·

■ - 29.Mai 1973 B.■ - May 29, 1973 B.

P 6123P 6123

Gesellschaft für Hydraulik-Zubehör mbH., 6603 Sulzbach/Saar, IndustriestraßeSociety for hydraulic accessories mbH., 6603 Sulzbach / Saar, Industriestrasse

"HydropneumatIsoher Druckspeicher" " HydropneumatIsoher pressure accumulator"

Die Erfindung betrifft einen hydropneumatischen Druckspeicher mit einem Speicherbehälter, in dem eine nachgiebige Trennwand untergebracht ist, die im Bereich ihrer Halterung eine Randverstärkung aufweist. ·The invention relates to a hydropneumatic pressure accumulator with a storage container in which a resilient partition is housed, the one in the area of its holder Has edge reinforcement. ·

Bei einem Druckspeicher dieser Art hat sich als nachteilig erwiesen, daß die nachgiebige Trennwand im Bereich der Randverstärkung zum· Reißen4 neigt, da sich hier beim Umfalten der Blase unter dem Druck des hydraulischen Druckmittels eine scharfe Biegefalte bildet. Der vorliegenden Erfindung liegtIn a pressure accumulator of this type it has been found to be disadvantageous that the flexible partition wall tends to tear 4 in the area of the edge reinforcement, since a sharp bending fold is formed here when the bladder is folded over under the pressure of the hydraulic pressure medium. The present invention lies

-2--2-

409882/0441409882/0441

-2- 29.MaI 1973-2- May 29, 1973

P 6123P 6123

die Aufgabe zugrunde, die Bildung einer schärfen Biegefalte zu verhindern. Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß im Bereich der Randverstärkung eine nach innen ragende Ringwulst vorgesehen ist. Hierdurch wird beim Umfalten der Trennwand eine scharfe Biegefalte vermieden, da der Biegeradius der Trennwand der Ringwulst entsprechend vergrößert wird.the underlying task is to prevent the formation of a sharp fold. This object is achieved according to the invention solved that an inwardly protruding annular bead is provided in the area of the edge reinforcement. This is when folding the partition wall a sharp bend avoided, since the bending radius of the partition wall corresponding to the annular bead is enlarged.

Es ist von Vorteil, wenn die Ringwulst einstückig mit der Trennwand ausgebildet ist.It is advantageous if the annular bead is integral with the Partition is formed.

Weitere vorteilhafte Merkmale ergeben sich aus den übrigen Ansprüchen, der Beschreibung und der Zeichnung. In dieser ist ein hydropneumatiseher Druckspeicher als Ausführungsbeispiel des Gegenstandes der Erfindung schematisch dargestellt. Es zeigenFurther advantageous features emerge from the remaining claims, the description and the drawing. In this a hydropneumatic pressure accumulator is shown schematically as an embodiment of the subject matter of the invention. Show it

Fig. 1 einen Längsschnitt, .Fig. 1 is a longitudinal section.

Pig. 2 einen Ausschnitt aus I1Ig-;. 1 in größerem Maßstab.Pig. 2 shows a section from I 1 Ig- ;. 1 on a larger scale.

Der hydropneumatisch^ Speicher hat einen aus einem Deckelteil 1 und einem Gehäuseteil 2. gebildeten Speicherbehälter. Im Deckelteil 1 befindet sich eine Bohrung 3 für die Aufnahme eines Hochdruckgasventils und in den Gehäuseteil 2 ist ein Anschlußstück 4- eingeschweißt, in dem sich ein Flüssigkeitsventil befindet, oder das daran angeschlossen werden kann.The hydropneumatic accumulator has a cover part 1 and a housing part 2 formed storage container. In the cover part 1 there is a hole 3 for receiving a high-pressure gas valve and in the housing part 2, a connector 4 is welded, in which a Liquid valve is located or that can be connected to it.

In den Gehäuseteil 2 ist ein Haltering 5 eingesetzt und an seinem in der Zeichnung oberen Teil mittels einer Schweißnaht 6 mit dem Speicherbehälter 1,2 versohweißt. Das in der Zeichnung untere Ende des Halteringes 5 iat nach innen eingeh bogen und dient zum Halten einer nachgiebigen topfförmigen Trennwand 9 aus Gummi oder dgl., welche an das Ende 8 des Halteringes 5 anvulkanisiert ist. Die Trennwand 9 ist anIn the housing part 2, a retaining ring 5 is inserted and attached its upper part in the drawing is welded to the storage container 1, 2 by means of a weld 6. That in the Drawing lower end of the retaining ring 5 iat inwardly detailed arch and serves to hold a resilient cup-shaped partition 9 made of rubber or the like. Which at the end 8 of the Retaining ring 5 is vulcanized. The partition 9 is on

882/0441882/0441

-3- 29.Mai 1973-3- May 29, 1973

P 6123P 6123

ihrem dem Anschlußstück 4 benachbarten Ende mit einem diesem Stück entsprechend ausgebildeten Anschlußstück 10 versehen.its end adjacent to the connector 4 with one of these Piece of appropriately designed connector 10 is provided.

Die Trennwand 9 hat, wie in Fig. 2 dargestellt, im Bereich ihrer Halterung an dem Haltering 5 eine mit ihr einstückige Randverstärkung 11, welche das Ende 8 des Halteringes 5 umgibt. Die Randverstärkung 11 hat einen von der Trennwand 9 kegelförmig nach außen sich erstreckenden Teil 12 , wobei ein gewölbter Übergang zwischen der Außenseite der Trennwand 9 und dem Teil 12 vorgesehen ist, und einen daran anschließenden zylindrischen Teil 14. Die Innenseite der Randverstärkung 11 ist im'Bereich des Endes 8 des Halteringes 5 dessen Übergang angepasst, wobei sich ein geringfügig nach innen vorstehender Randteil" 15 mit im Querschnitt stumOf em . Winkel ergibt. An der Übergangsstelle zwischen der Trennwand 9 und der Randverstärkung 11 ist auf der inneren Seite eine Ringwulst 13 vorgesehen, die im Querschnitt halbkreisförmig mit abgerundeten Übergängen und mit der Trennwand 9 und mit der Randverstärkung 11 einstückig ausgebildet ist.As shown in FIG. 2, the partition wall 9 has, in the region of its mounting on the retaining ring 5, an edge reinforcement 11 which is integral with it and which surrounds the end 8 of the retaining ring 5. The edge reinforcement 11 has a conically outwardly extending part 12 from the partition 9, a curved transition being provided between the outside of the partition 9 and the part 12, and an adjoining cylindrical part 14. The inside of the edge reinforcement 11 is in the ' The transition area of the end 8 of the retaining ring 5 is adapted to its transition, resulting in a slightly inwardly protruding edge part 15 with a stumOf em. Angle in cross section , which is semicircular in cross section with rounded transitions and formed in one piece with the partition 9 and with the edge reinforcement 11.

Die J?orm der Ringwulst 13 ist so gewählt und diese ist auch so angeordnet, daß die Trennwand 9 beim Umfalten an der Übergangsstelle zwischen ihr und der Randverstärkung 11 keine scharfe Biegekante, sondern nur eine einer wesentlich geringeren Beanspruchung ausgesetzte Wölbung bilden kann. Die Ringwulst 13 ist so bemessen, daß sie die Lebensdauer der Trennwand 9 gegenüber einer keine Ringwulst 13 aufweisenden Trennwand 9 wesentlich vergrößert, aber das Umfalten der Trennwand 9 in den Deckelteil 1 hinein nicht wesentlich behindert. ·The junction of the annular bead 13 is chosen and this is also arranged so that the partition 9 when folded over at the transition point between it and the edge reinforcement 11 do not form a sharp bending edge, but only a curvature that is exposed to much less stress can. The annular bead 13 is dimensioned so that it extends the service life the partition 9 compared to a partition 9 not having an annular bead 13 is significantly enlarged, but that Do not fold the partition 9 into the cover part 1 substantially handicapped. ·

-4--4-

409882/0441409882/0441

Claims (3)

-4- ' 29.Hai 1973 B. P 6123 AnsOrüche-4- 'May 29, 1973 B. P 6123 AnsOrüche 1. JtlvdrotmeuRiatischer Druckspeicher rait einem Sn eic herb ehalter, in dem eine nachgiebige Trennwand untergebracht ist, die im Bereich ihrer Halterung eine Randverstärkung aufweist, dadurch ge.kennzeichnet, daß im Bereich der Randverstärkung (11) eine nach innen ragende Ringwulst (13) vorgesehen ist.1. JtlvdrotmeuRiatischer pressure accumulator rait a Sn eic herb ehalter, in which a flexible partition is housed, which has an edge reinforcement in the area of its holder has, characterized in that in the area of the edge reinforcement (11) an inwardly protruding Annular bead (13) is provided. 2. Druckspeicher nach Anspruch 1, dadurch gekennzeichnet, daß die Ringwulst (13) einstückig mit der Trennwand (9) ausgebildet ist.2. Pressure accumulator according to claim 1, characterized in that the annular bead (13) is integral with the partition (9) is formed. 3. Druckspeicher nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Ringwulst (13) mindestens auf der von der Randverstärkung (11) abgewandten Seite im Querschnitt etwa in Porm eines Kreisbogens ausgebildet ist,3. Pressure accumulator according to claim 1 or 2, characterized in that that the annular bead (13) at least on the side facing away from the edge reinforcement (11) in the Cross-section is approximately in the form of an arc of a circle, Druckspeicher nach einem der vorhergehenden Ansprüche, bei dem die Randverstärkung einen äußeren kegelartigen Teil am Übergang zur Trennwand hat, dadurch gekennzeichnet, daß die nach innen ragende Ringwulst (13) im Bereich des Überganges zwischen der Randverstärkung (11) und der Trennwand (9) angeordnet ist.Pressure accumulator according to one of the preceding claims, in which the edge reinforcement has an outer cone-like part at the transition to the partition wall, characterized in that the inwardly protruding annular bead (13) is arranged in the area of the transition between the edge reinforcement (11) and the partition (9). 409882/0441409882/0441
DE2327461A 1973-05-30 1973-05-30 HYDROPNEUMATIC PRESSURE ACCUMULATOR Pending DE2327461A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE2327461A DE2327461A1 (en) 1973-05-30 1973-05-30 HYDROPNEUMATIC PRESSURE ACCUMULATOR
US466007A US3918497A (en) 1973-05-30 1974-05-01 Pressure accumulator
CA200,063A CA1004110A (en) 1973-05-30 1974-05-16 Pressure accumulator
FR7418179A FR2231901B1 (en) 1973-05-30 1974-05-27
JP49060206A JPS5842361B2 (en) 1973-05-30 1974-05-28 Atsuriyokuyouki
SE7407039A SE408578B (en) 1973-05-30 1974-05-28 PRESSURE ACCUMULATOR
GB2383974A GB1477488A (en) 1973-05-30 1974-05-29 Pressure vessels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2327461A DE2327461A1 (en) 1973-05-30 1973-05-30 HYDROPNEUMATIC PRESSURE ACCUMULATOR

Publications (1)

Publication Number Publication Date
DE2327461A1 true DE2327461A1 (en) 1975-01-09

Family

ID=5882526

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2327461A Pending DE2327461A1 (en) 1973-05-30 1973-05-30 HYDROPNEUMATIC PRESSURE ACCUMULATOR

Country Status (7)

Country Link
US (1) US3918497A (en)
JP (1) JPS5842361B2 (en)
CA (1) CA1004110A (en)
DE (1) DE2327461A1 (en)
FR (1) FR2231901B1 (en)
GB (1) GB1477488A (en)
SE (1) SE408578B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2604959A1 (en) * 1975-02-24 1976-09-02 Greer Hydraulics Inc PRESSURE VESSEL AND PROCESS FOR ITS MANUFACTURING
DE2623951A1 (en) * 1976-05-28 1977-12-01 Integral Hydraulik Langen & Co Hydropneumatic pressure store - has membrane dividing housing and gas chamber filled with incompressible filler

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52142432A (en) * 1976-05-21 1977-11-28 Mitsubishi Electric Corp Display device
US4181156A (en) * 1978-12-04 1980-01-01 Greer Hydraulics, Inc. Pressure accumulator with anti-extrusion gas charging valve assembly
JPS5692704U (en) * 1979-12-17 1981-07-23
JPS6015964U (en) * 1983-07-12 1985-02-02 株式会社　京浜精機製作所 liquid fuel supply device
GB8806292D0 (en) * 1988-03-17 1988-04-13 Automotive Prod Plc Power hydraulic system
EP1391614B1 (en) * 2000-05-30 2006-05-17 NHK Spring Co., Ltd. Accumulator
US8232564B2 (en) * 2007-01-22 2012-07-31 Cree, Inc. Wafer level phosphor coating technique for warm light emitting diodes

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2421076A (en) * 1942-09-04 1947-05-27 Bendix Aviat Corp Accumulator
US2480558A (en) * 1944-03-09 1949-08-30 Bendix Aviat Corp Accumulator
US2932321A (en) * 1952-12-23 1960-04-12 Mercier Jean Pressure accumulator
US3420273A (en) * 1965-11-30 1969-01-07 Greer Hydraulics Inc Pressure accumulator
US3500866A (en) * 1967-08-01 1970-03-17 Greer Hydraulics Inc Pressure vessel
US3654964A (en) * 1969-03-03 1972-04-11 Jean Mercier Pressure vessels
FR2082199A5 (en) * 1970-03-06 1971-12-10 Mercier J
US3690347A (en) * 1970-12-16 1972-09-12 Greer Hydraulics Inc Pressure vessel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2604959A1 (en) * 1975-02-24 1976-09-02 Greer Hydraulics Inc PRESSURE VESSEL AND PROCESS FOR ITS MANUFACTURING
DE2623951A1 (en) * 1976-05-28 1977-12-01 Integral Hydraulik Langen & Co Hydropneumatic pressure store - has membrane dividing housing and gas chamber filled with incompressible filler

Also Published As

Publication number Publication date
GB1477488A (en) 1977-06-22
US3918497A (en) 1975-11-11
JPS5842361B2 (en) 1983-09-19
SE408578B (en) 1979-06-18
SE7407039L (en) 1974-12-02
FR2231901A1 (en) 1974-12-27
CA1004110A (en) 1977-01-25
FR2231901B1 (en) 1979-02-16
JPS5031415A (en) 1975-03-27

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