EP0130035B1 - An apparatus for producing gas blast - Google Patents

An apparatus for producing gas blast Download PDF

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Publication number
EP0130035B1
EP0130035B1 EP84304125A EP84304125A EP0130035B1 EP 0130035 B1 EP0130035 B1 EP 0130035B1 EP 84304125 A EP84304125 A EP 84304125A EP 84304125 A EP84304125 A EP 84304125A EP 0130035 B1 EP0130035 B1 EP 0130035B1
Authority
EP
European Patent Office
Prior art keywords
tank
cylinder
piston
port
cylinder chamber
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
Application number
EP84304125A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0130035A1 (en
Inventor
Teruo Masuko
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.)
Chubu Handling Co Ltd
Original Assignee
Chubu Handling Co Ltd
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 Chubu Handling Co Ltd filed Critical Chubu Handling Co Ltd
Publication of EP0130035A1 publication Critical patent/EP0130035A1/en
Application granted granted Critical
Publication of EP0130035B1 publication Critical patent/EP0130035B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0119—Shape cylindrical with flat end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/032—Orientation with substantially vertical main axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/035—Orientation with substantially horizontal main axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/013—Two or more vessels
    • F17C2205/0134—Two or more vessels characterised by the presence of fluid connection between vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0326—Valves electrically actuated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0335—Check-valves or non-return valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0388—Arrangement of valves, regulators, filters
    • F17C2205/0394—Arrangement of valves, regulators, filters in direct contact with the pressure vessel
    • F17C2205/0397—Arrangement of valves, regulators, filters in direct contact with the pressure vessel on both sides of the pressure vessel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/018—Acetylene
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/031—Air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0157—Compressors

Definitions

  • the present invention relates to an apparatus for producing gas blast and more particularly to improvement of or relating to an apparatus for converting compressed gas in a tank to gas blast in the form of blasting stream.
  • Gas blast which flows just like explosion wind has-been widely utilized in many scientific and engineering fields such as experiments for the study of fluid dynamics in wind tunnel, distribution of granular material over wide area, removal of bridges built in handling pulverized material stored in silo or the like building, cleaning of the interior of pipe or tube or the like.
  • the apparatus of the original invention essentially comprises a tank in which pressurized gas is accumulated, a cylinder integrally fitted to the tank with a blowing port formed on the one side wall thereof and a piston slidably disposed in the cylinder to normally close the blowing part therewith.
  • This piston is formed with an axially extending hole by way of which the tank is in communication with the cylinder and a spring is housed in the cylinder chamber so as to allow it to resume the closed position after completion of one cycle of gas blasting.
  • a spring tends to be broken during repeated operations and this leads to interruption of operation of the apparatus for a long time.
  • Another drawback of the prior apparatus is that it is not easy to be maintained.
  • the present invention has been made with the foregoing drawbacks in mind and its object resides in providing an improved apparatus for producing gas blast which assures that operation is performed without any necessity for spring or the like resilient means.
  • FR-A-2429952 discloses an apparatus for producing a gas blast and having a tank in which pressurised gas is accumulated.
  • the tank is in communication with one end of a cylinder and the cylinder has a blowing port provided on its side wall.
  • a piston is slidably disclosed in the cylinder to close the blowing port when the piston is at the end of the cylinder adjacent to the tank.
  • the other end of the cylinder is provided with a cover having an introducing port which is in communication with a high pressure gas supply source, the tank serving to accumulate pressurised gas supplied to it through the cylinder.
  • a valve means is provided to control the supply of pressurised gas through the introducing port in the cover.
  • valve means Upon the valve means being operated to supply gas through the introducing port into the cylinder, the piston moves within the cylinder towards the tank to close the blowing port and to allow the supply of pressurised gas to the tank. Upon closure of the valve means the piston moves within the cylinder away from the tank thereby connecting the pressurised gas accumulated within the tank to the blowing port.
  • the valve is of the 3-way type.
  • US-A-3788527 also discloses apparatus for producing a gas blast having a tank in which pressurised gas is accumulated and also has a cylinder connected to the tank at one end and arranged to receive pressurised gas from a high pressure gas supply source at the other end. Valve means are arranged to control the supply of high pressure gas to the said other end of the cylinder.
  • valve means Upon the valve means being actuated to allow the supply of high pressure gas to the cylinder, the piston moves to a position to which gas is supplied through an opening into the tank but in which the outlet is closed. Upon the high pressure being released the piston moves to a position in which it opens the outlet.
  • an apparatus for producing gas blast of the type including a tank in which pressurised gas is accumulated, one end of said tank being in communication with a high pressure gas supply source and having an inlet port through which high pressure gas is introduced therein, a cylinder integrally fitted to the other end of the tank with a blowing port provided on the side wall thereof and with a cover (4) containing a pressure release valve (5), said cylinder, being in communication with the tank via an opening at the other end of the tank, and a piston slidably disposed in the cylinder to close the blowing port while it is kept immovable in the cylinder at the position located closest to the tank, the cylinder chamber (R) disposed between the cover (4) and the piston (6) being in communication with the high pressure gas supply source (C) to create a back pressure in the cylinder chamber said valve means being provided on the cover so as to release back pressure in the cylinder chamber therethrough characterised in that said cover has an introducing port which is in communication with the high pressure gas supply source via
  • valve means When the valve means is actuated to open and thereby the piston is displaced away from the tank with back pressure being released to the outside from the cylinder chamber, the blowing port on the side wall of the cylinder is opened to the outside so that gas blast is produced. It should be noted that air is usually employed as working gas.
  • the valve means is preferably designed and constructed in the form of an electromagnetically operated valve.
  • the piston is preferably fitted with seal members at both the front and rear faces thereof.
  • reference numeral 1 designates a tank in which compressed air is received.
  • the tank 1 has an inlet port 1a at the lefthand end as seen in the drawing through which compressed air is introduced, whereas it has an outlet opening 1 c at the righthand end with a flange 1d being fixedly secured thereto.
  • a plurality of brackets 1e are provided on the outer surface of the tank 1.
  • the inlet port 1 a and the branch inlet port 1 b are in communication with a compressor C via a check valve 2.
  • reference numeral 3 designates a cylinder which includes flanges 3c at both the ends as seen in the axial direction.
  • the flanges 3c are designed substantially same to the flange 1 d of the tank 1.
  • a blowing pipe 3a having a blowing port 3b is projected upwardly of the cylinder 3 as seen in the drawing at the position located in the proximity of the flange 3c.
  • the axis of the blowing pipe 3a extends at a right angle relative to the axis of the cylinder 3.
  • the lefthand flange 3c of the cylinder is detachably connected to the flange 1 d of the tank 1 by means of bolts so that the cylinder 3 is in communication with the tank 1.
  • the righthand flange 3c of the cylinder 3 has a cover 4 detachably fitted thereto by means of bolts and a discharging port 4a and an introducing port 4b are formed on the cover 4 so that compressed air is introduced into the cylinder 3 through the introducing port 4b and discharged therefrom through the discharging port 4a.
  • the introducing port 4b is designed to have a cross-sectional area larger than that of the inlet port 1a a on the tank 1.
  • a branch piping 8 which extends therebetween.
  • the discharging port 4a is opened when a valve 5 such as electromagnetically operated valve or the like is operated.
  • reference numeral 6 designates a fully closed hollow piston which is disposed slidably in the axial direction in the cylinder 3.
  • the piston 6 serves to close the blowing port 3b when it is displaced to the lefthand end of the cylinder 3 located closest to the tank 1.
  • seal members 7 fixedly attached to both the end faces thereof.
  • the compressor C When the apparatus is in use, the compressor C is first operated with the valve 5 on the cover 4 closed. A part of compressed air delivered from the compressor C is introduced into the tank 1 via the check valve 2 and the inlet port 1a, whereas a part of compressed air is simultaneously introduced into the cylinder chamber R via the branch inlet port 1 b, the branch piping 8 and the introducing port 4b. Since each of the branch inlet port 1b, the branch piping 8 and the introducing port 4b is designed to have a cross-sectional area larger than that of the inlet port 1a, back pressure in the cylinder chamber R becomes higher than accumulated pressure in the tank 1 as compressed air is simultaneously introduced into the tank 1 and the cylinder 3.
  • the piston 6 is slidably displaced in the cylinder 3 to the lefthand end of the latter at which it is held immovably under the influence of differential pressure existent between the tank 1 and the cylinder chamber R (see Fig. 1). While the piston 6 is located at the lefthand end of the cylinder 3 against flange 3c, acting as a stop member, the blowing port 3b is closed with the piston 6 and pressure in both the tank 1 and the cylinder chamber R increases gradually with the above-mentioned differential pressure maintained, as compressed air is introduced further into them.
  • the piston 6 is fitted with seal members 7 at both the ends in such a manner that they come in pressure contact with the inner wall of the cylinder 3, resulting in compressed air being inhibited from leaking from both the tank 1 and the cylinder chamber R irrespective of the fact that increased pressure is existent therein as compressed air is introduced further.
  • valve 5 on the cover 4 When pressure in the tank 1 reaches a predetermined level, the valve 5 on the cover 4 is actuated to open whereby compressed air in the cylinder chamber R is discharged to the outside via the valve 5.
  • This causes pressure in the cylinder chamber R to be decreased to an atmospheric level instantaneously and thereby remarkable differential pressure is created between the tank 1 and the cylinder chamber R.
  • the piston 6 is slidably displaced in the rightward direction under the effect of compressed air in the tank 1 whereby communication is established between the tank 1 and the blowing port 3b, causing compressed air accumulated in the tank 1 to be instantaneously discharged to the outside in the form of blast via the blowing port 3b (see Fig. 2).
  • since arrangement is made such that the valve 5 is kept open for a very short period of about one second, delivering means of compressed air from the compressor C is by no means affected adversely.
  • the apparatus of the invention makes it possible to intermittently produce a series of air blasts by repeating the steps of above-described operations as required.
  • a tank 1 is employed as means for accumulating compressed air therein but the present invention should not be limited only to this.
  • any type of commercial high pressure gas bomb acetylene bomb, nitrogen bomb or the like may be used.
  • the apparatus of the invention includes a tank 1 and a piston 6 and the latter is adapted to return to the original position where the blowing port 3b is closed with the piston 6 under the effect of differential pressure existent between the tank 1 and the cylinder chamber R so that compressed air accumulated in the tank 1 is discharged to the outside through the blowing port 3b in the form of blast, explosion wind or the like when the valve 5 is actuated quickly so as to establish communication between the tank 1 and the blowing port 3b.
  • produced air blast is advantageously utilized in many application fields such as experiments in wind tunnel for the purpose of study of fluid dynamics, distribution of granular material over wide area, removal of bridges built when handling powdered material stored in silo or the like building, cleaning of the interior of pipe or tube or the like.
  • the apparatus of the invention is not provided with a spring which serves as resilient means for return movement of the piston to the closed position and moreover there is no necessity for any passage hole extending through the piston to establish communication between the tank and the cylinder chamber as is the case with the aforementioned Japanese Patent, the apparatus can be manufactured in accordance with conventional mass production system at a relatively inexpensive cost and it is easy to be maintained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Nozzles (AREA)
EP84304125A 1983-06-22 1984-06-19 An apparatus for producing gas blast Expired EP0130035B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP58112435A JPS604694A (ja) 1983-06-22 1983-06-22 気体の噴出装置
JP112435/83 1983-06-22

Publications (2)

Publication Number Publication Date
EP0130035A1 EP0130035A1 (en) 1985-01-02
EP0130035B1 true EP0130035B1 (en) 1987-10-07

Family

ID=14586557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84304125A Expired EP0130035B1 (en) 1983-06-22 1984-06-19 An apparatus for producing gas blast

Country Status (4)

Country Link
EP (1) EP0130035B1 (ja)
JP (1) JPS604694A (ja)
KR (1) KR890002992B1 (ja)
DE (1) DE3466733D1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0684797B2 (ja) * 1985-03-29 1994-10-26 中部ハンドリング株式会社 気体の噴出装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788527A (en) * 1973-01-22 1974-01-29 Martin Eng Co Quick-release aerator for introducing high pressure air into a container to facilitate dispensing
JPS5346484A (en) * 1976-10-12 1978-04-26 Tokuyama Soda Co Ltd Electrolytic cell

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2429952A1 (fr) * 1978-06-27 1980-01-25 Simoens Herve Valve d'alimentation puis de decharge brutale d'une capacite

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788527A (en) * 1973-01-22 1974-01-29 Martin Eng Co Quick-release aerator for introducing high pressure air into a container to facilitate dispensing
JPS5346484A (en) * 1976-10-12 1978-04-26 Tokuyama Soda Co Ltd Electrolytic cell

Also Published As

Publication number Publication date
KR850000635A (ko) 1985-02-28
JPS604694A (ja) 1985-01-11
DE3466733D1 (en) 1987-11-12
EP0130035A1 (en) 1985-01-02
KR890002992B1 (ko) 1989-08-16

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