WO1985004837A1 - Appareil de transport - Google Patents

Appareil de transport Download PDF

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Publication number
WO1985004837A1
WO1985004837A1 PCT/SE1985/000174 SE8500174W WO8504837A1 WO 1985004837 A1 WO1985004837 A1 WO 1985004837A1 SE 8500174 W SE8500174 W SE 8500174W WO 8504837 A1 WO8504837 A1 WO 8504837A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
spiral
disposed
hose
section
Prior art date
Application number
PCT/SE1985/000174
Other languages
English (en)
Inventor
Richard Bruke
Original Assignee
Spirac Engineering Ab
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20355636&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1985004837(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Spirac Engineering Ab filed Critical Spirac Engineering Ab
Priority to DE8585902197T priority Critical patent/DE3567597D1/de
Priority to EP85902197A priority patent/EP0179842B2/fr
Priority to GB08529528A priority patent/GB2169217B/en
Priority to AT85902197T priority patent/ATE40075T1/de
Publication of WO1985004837A1 publication Critical patent/WO1985004837A1/fr
Priority to HK30693A priority patent/HK30693A/xx
Priority to US08/291,431 priority patent/US5562029A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/22—Extrusion presses; Dies therefor
    • B30B11/24—Extrusion presses; Dies therefor using screws or worms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/18—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing with means for adjusting the outlet for the solid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/30—Presses specially adapted for particular purposes for baling; Compression boxes therefor
    • B30B9/3082—Presses specially adapted for particular purposes for baling; Compression boxes therefor with compression means other than rams performing a rectilinear movement

Definitions

  • the present invention relates to an apparatus for receiving, conveying and/or impacting of material in which are included f ac ⁇ tions of different sizes, densities, elasticity, moisture-content etc., the apparatus including at least one shaftless spiral in which each spiral is disposed in a preferably closed casing and, more precisely, there are provided drive means, for the rotation of the spiral or spirals, repectively, in conjunction with that por ⁇ tion of the casing where the material is received, and there are provided, at least for one of the combinations of casing - spiral, counterpressure members which arrest or brake the movement of the material in conjunction with that portion of the casing which serves as a discharge portion for the material.
  • the present invention constitutes a conveyor apparatus in which is included means for compaction of the material being con ⁇ veyed and in which the above-indicated disadvantages are obviated to a remarkable extent.
  • the invention relates to a combination of shaftless spiral and a casing.
  • the combination of spiral and casing creates a compact unit of equipment which makes for reliable con- veyance of the material and is used, according to the invention, to realise a compaction of the material at same time as the material is enclosed, which entails that the surrounding environment is not affected.
  • the em ⁇ ployment of compaction reduces the moisture-content in the ma- terial, while in other embodiments, the compaction of the material constitutes the basis of a batchwise discharging of the material from the apparatus.
  • the apparatus includes at least one shaftless spiral which is disposed in a preferably enclosed casing of, for example, U-shaped and/or circular cross-section.
  • a drive means for the rotation of the spiral is disposed in conjunction with that portion of the cas ⁇ ing where the material is fed into the combination of casing and spiral, while in the other section of the casing, i.e. in con ⁇ junction with the discharge portion of the casing, there is pro- vided a zone in which the casing is of a cross-section which en ⁇ tails that the casing completely surrounds the spiral with slight play.
  • the casing is provided with an end region in the extension plane of the spiral, in which the spiral is not enclosed by the casing and/or in which a counterpressure member is disposed.
  • compaction of the material takes place.
  • the compaction is further amplified in that the spiral is provided with progressively diminishing pitch.
  • the spiral is completely free, i.e. is not journalled in that end which is directed towards the discharge section of the casing.
  • the counter- pressure member consists of a spring-loaded counterpressure plate which is movably journalled in the upper defining surface of the casing and/or in conjunction with the discharge opening of the cas ⁇ ing.
  • the counterpressure plate is disposed in a receptacle chamber.
  • the braking effect of the casing on the material is amplified in that the casing, most proximal the discharge opening, is provided with reduced inner . cross-section.
  • the counterpressure member con ⁇ sists of a receptacle device, for example a container, a hose etc., the member being shiftable in the axial direction of the casing.
  • the material is conveyed into the receptacle device, the material moving the receptacle device in the axial direction of the spiral.
  • the counterpressure member consists of a shaftless spiral disposed in a casing, this casing having an infeed opening connected to the discharge opening of the delivering casing. That casing which discharges the material is, in this instance, of an orientation which entails that its axis is directed towards the centre axis of the spiral and the receiving combina- tion of casing and spiral.
  • the pitch, speed and/or radial extent of the spiral blades are, in the receiving combination, adapted so as to occasion a braking of the material movement before the material reaches the dis ⁇ charge opening of the disclosed casing.
  • the substantially complete filling constitutes a precondition for being able to convey the material upwardly in a more or less vertical direction.
  • the receiving combination with its axis directed, for example, horizontally, vertically, or there ⁇ between.
  • the casing is provided with drainage openings which, preferably, are located in that region of the cas ⁇ ing where compaction of the material takes place.
  • an orientation of the casing is advantageously selected so as to entail that the discharge section of the casing is placed higher than its infeed section, whereby, on compaction, the pressed out liquid is conveyed in a direction opposite to the direction of movement of the material and is drained out from the casing through the previously-mentioned drainage openings.
  • Figs, la-c are sections taken along the lines A-A, B-B, and C-C in Fig. 1;
  • Fig. 2 shows the material distribution in the longitudinal di- rection of the apparatus
  • Figs. 3-5 illustrate embodiments of the apparatus according to the present invention in which this is provided with counter ⁇ pressure members for braking the material on its movement;
  • Figs. 6a and b are partial sections through embodiments of the apparatus according to the present invention, in which the casing of the apparatus is provided with drainage openings;
  • Figs. 7a and b are partial sections through embodiments of the apparatus according to the present invention, in which this is pro ⁇ vided, in conjunction with its discharge opening with a shif able receptacle member;
  • Figs. 8a and b are partial sections through one embodiment of the apparatus according to the present invention, in which this, in conjunction with its discharge opening, cooperates with a conveyor apparatus which includes a casing surrounding a shaftless spiral; and
  • Figs. 9a-c show details of the free end of the spiral.
  • FIG. 1 and 2 illustrate the inven ⁇ tion, in one embodiment which shows the fundamental construction and function of the invention.
  • an apparatus 1 which includes an elongate, tube-like casing 2 in which is placed a shaftless spiral 3. At its one end, the casing is provided with an infeed opening 14 which connects to an up ⁇ wardly-directed drum 16.
  • a motor 4 drives the spiral 3 by the in ⁇ termediary of a gearing and journalling unit 30.
  • the other end of the casing constitutes the discharge portion 18 of the apparatus, which is provided with a discharge opening 24.
  • the spiral is solely journalled in connection with the gearing and journalling unit, while that end of the spiral which is directed towards the dis ⁇ charge portion is fully free.
  • Fig. 1 Seen in the axial direction of the casing, the combination of spiral and casing is divided into an infeed zone 20, a transport zone 21, a precompaction zone 22 and a compaction zone 23.
  • the cross-sections through each respective zone in the illustrated em ⁇ bodiment are apparent from Figs. la-c. It will be appreciated from these Figures that the cross-section of the casing in the precomp ⁇ action zone is substantially circular and surrounds the spiral with slight play.
  • Fig. 1 also shows by solid line a relatively abrupt transition between the tranport zone 21 and the precompaction zone 22. However, in certain physical applications, the embodiment shown by broken lines is selected, with a relatively continuous tran ⁇ sition between the cross-sections of the transport zone and the precompaction zone.
  • Figs. 3 and 4 show how the combination of spiral and casing is provided with a counterpressure member 25, 8, for arresting or braking the movement of the material in the compaction zone 23 of the casing.
  • the counter- pressure member 25 is formed in that the movement of the material is braked during movement in the longitudinal direction of the cas ⁇ ing, because of friction against the inner surface of the casing. in certain physical applications, the braking effect is amplified in that the casing is, in the region of the compaction zone 23, provided with reduced inner cross-section.
  • Fig. 4a shows, first, one embodiment in which the counter ⁇ pressure member consists of a counterpressure plate 8a disposed in association with the discharge opening 24 and pivotally journalled in conjunction with the upper region of the discharge opening, and movable in the direction of the double-headed arrow A; and se ⁇ condly, an embodiment in which the counterpressure member consists of a counterpressure plate 8b which is pivotal and preferably re- turn spring-biased in the upper defining surface 27 of the casing 2.
  • Fig. 4b shows a partial longitudinal section and Fig. 4c a view taken along the line D-D in Fig. 4b of one embodiment in which the counterpressure member consists of a split cone 34.
  • the cone comprises two halves 34a and 34b and is openable under the counteraction of springs 35 whose spring force is adapted to pro ⁇ vide that counterpressure which is requisite to attain the intended compaction of the material.
  • Fig. 5 shows one embodiment in which the counterpressure plate 8a, in conjunction with the discharge opening 24, is disposed in a receptacle chamber 7.
  • the counterpressure plate is journalled in the upper defining sur ⁇ face of the chamber, but the journalling may, for example, corre ⁇ spond to that of those embodiments as shown in Fig. 4.
  • Figs. 6a and b show embodiments in which the casing 2, in con ⁇ junction with the precompaction zone 22 and the compaction zone 23, is provided with drainage openings 33.
  • Figs. 7a and b show embodiments of the present invention in which the counterpressure member consists of a receptacle device 26, 28, shiftable in the axial direction of the casing and, in Fig. 7a, comprising a container 26, while in Fig. 7b, a hose 28. in this instance, the hose 28 is drawn out from a magazine 29.
  • braking means 36 are provided for restricting the withdrawal of the hose from the magazine.
  • an arrow F intimates a force which is counter-directed to the movement of the container.
  • the arrow represents a device, for example a hydrau- lie cylinder.
  • Pigs. 7a and b show embodiments of the invention in which the mat- erial surrounded by the container and/or the hose is compacted.
  • Figs. 8a and b show one embodiment of the invention in which the apparatus 1 includes at least one supplementary conveyor ap ⁇ paratus 50 comprising a casing 52 and a shaftless spiral 53 placed therein.
  • the spiral is driven by a motor 54 by the intermediary of a gearing and journalling unit 51 and its speed is, thus, for ex ⁇ ample by modification of the gear ratio, adjustable to any desired level.
  • the direction of the first spiral 3 and/or a central shaft of the discharge end 18 of the casing is towards the central axis of the spiral 53 of the conveyor apparatus.
  • the opening surface ar- ea of the discharge opening 24 of the casing 2 substantially agrees with the cross-sectional area of the receiving casing 52, both of the casings being substantially sealingly interconnected.
  • the con ⁇ veyor apparatus 50 is, in certain embodiments, disposed to move the material essentially horizontally, while in other embodiments, movement is effected during alteration of the level of the ma ⁇ terial.
  • the casing 52 of the conveyor apparatus 50 with the spiral placed therein has a substantially vertical direction. In this in ⁇ stance, the free end of the spiral is directed upwardly.
  • Figs. 9a-c show embodiments of the free end 31-32 of the spi ⁇ ral 3.
  • the end 31 of the spiral terminates in such a manner that its blade height continuously diminishes from the inner and outwardly, i.e. the centre hole of the spiral increases pro ⁇ gressively.
  • Figs. 9b and c show embodiments in which the end 32 of the spiral is disposed for a gradual reduction of its blade height.
  • Material which is supplied to the apparatus 1 through the in ⁇ feed opening 14 in the casing- 2 is moved in a direction towards the discharge opening 24 by.rotation of the. spiral 3.
  • braking is effected of the movement of the ma- terial in the compaction zone 23 by friction against the inner wall of the casing in the compaction zone (Fig. 3), by the action of the counterpressure plates 8a, 8b (Figs. 4 and 5), or by a combination of friction and pressure which is obtained in that the cross-sec ⁇ tion (Fig. 3) of the casing diminishes, or alternatively in that the casing terminates in the cone 34 (Fig. 4b).
  • a reduction is effected of the liquid-content of the material, during passage through the precompaction zone 22 and the compaction zone 23.
  • the casing 2 is, in such instances, disposed such that the material is moved slightly up ⁇ wardly when it passes in a direction towards the discharge opening 24.
  • drainage of the material will be facilitated, since a portion of the liquid will pass in a direction opposite to the di- rection of movement of the material and substantially in the centre of the shaftless spiral, before the liquid runs out through the drainage openings 33.
  • the liquid it will be possible for the liquid to reach the drainage openings of the casing in a region where the material has not yet had time to be compacted to any ap- preciable degree.
  • the container, the hose - or alternatively the hose in combination with the container - is progressively forced out from the casing 2 by the action of forces from the ma- terial, at the same time as the material is compacted and then attains, as a rule, a degree of compaction which is in addition to the previously-attained compaction.
  • the conveyor apparatus 50 constitutes a counterpressure member in that the di- mensions, pitch and speed of the spiral 53 have been selected such that the material is braked in its movement on passage out from the discharge opening 24 of the casing 2.
  • the desired compaction of the material when this is located in the casing 52 of the receiving combination, and thereby requisite fil- ⁇ ng of the casing of the receiving combination.
  • counterpressure members are, in certain embodiments, combined so that, for example, there will be included in one and the same apparatus, a ccounterpressure plate 8a, b, and a terminating conical portion of the casing; a counterpressure plate 8a, b, and a shiftable receptacle member 26, 28; a cone 34 and the receiving casing 52 with spiral 53; and so on.
  • a braking of the material takes place in the precompaction zone to such a great extent that at least that section of the casing located most proximal the compaction zone will be as good as completely filled with material.
  • the thus compacted material is thereafter caused to leave casing through its discharge opening 24 in batches whose size is determined by the rotation of the spiral (the angular alteration which the spiral undergoes), in conjunction with each discharge oc ⁇ casion.
  • the present invention offers a simple and reliable technique for the batchwise discharge, with a relatively degree of accuracy, of material from an apparatus according to the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screw Conveyors (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Transmission Devices (AREA)
  • Braking Arrangements (AREA)
  • Refuse Collection And Transfer (AREA)

Abstract

Appareil (1) de transport et de compactage de matériau, où le matériau comporte des fractions de différentes tailles, densités, élasticités, teneurs en humidité, etc.. L'appareil comporte au moins une spirale sans axe (3), chaque spirale étant disposée dans un boîtier de préférence fermé (2) par exemple en forme de U et/ou de section transversale circulaire. Un mécanisme d'entraînement (4) est prévu pour la rotation de la spirale et placé conjointement avec la partie de boîtier où le matériau est introduit dans le boîtier. A l'extrémité opposée du boîtier, c'est-à-dire à l'extrémité placée à proximité de la section de décharge (18) du boîtier, le boîtier entoure la spirale avec un faible jeu et comporte en outre, dans une extension de la spirale, une région terminale (23) dans laquelle la spirale n'est pas entourée du boîtier. En règle générale, des éléments de contre pression sont prévus pour freiner le mouvement du matériau. Dans certains modes de réalisation, l'effet de freinage considéré est réalisé par le fait que la région terminale (23) offre une friction suffisante par rapport au matériau.
PCT/SE1985/000174 1984-04-19 1985-04-16 Appareil de transport WO1985004837A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE8585902197T DE3567597D1 (en) 1984-04-19 1985-04-16 A conveyor apparatus
EP85902197A EP0179842B2 (fr) 1984-04-19 1985-04-16 Appareil de transport
GB08529528A GB2169217B (en) 1984-04-19 1985-04-16 A conveyor apparatus
AT85902197T ATE40075T1 (de) 1984-04-19 1985-04-16 Foerdervorrichtung.
HK30693A HK30693A (en) 1984-04-19 1993-04-01 A conveyor apparatus
US08/291,431 US5562029A (en) 1984-04-19 1994-08-16 Conveying and compacting apparatus having a shaftless spiral in a casing with drainage openings

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8402202A SE446956B (sv) 1984-04-19 1984-04-19 Anordning for forflyttning av material medelst minst en axellos spiral
SE8402202-9 1984-04-19

Publications (1)

Publication Number Publication Date
WO1985004837A1 true WO1985004837A1 (fr) 1985-11-07

Family

ID=20355636

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1985/000174 WO1985004837A1 (fr) 1984-04-19 1985-04-16 Appareil de transport

Country Status (5)

Country Link
EP (1) EP0179842B2 (fr)
DE (3) DE8590093U1 (fr)
GB (1) GB2169217B (fr)
SE (1) SE446956B (fr)
WO (1) WO1985004837A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219785A2 (fr) * 1985-10-18 1987-04-29 Spirac Engineering Ab Dispositif pour le compactage de matériau et la réduction de sa teneur en liquide
US4961864A (en) * 1988-02-29 1990-10-09 Spirac Engineering Ab Separating device
EP0396392A1 (fr) * 1989-05-01 1990-11-07 Larry E. Koenig Déchiqueteur
US5012731A (en) * 1985-06-26 1991-05-07 Yves Maisonneuve Device for pressing heterogeneous mixtures with regulated pressing force for separating liquid and solid fractions thereof, in particular fruit juices
EP0443961A1 (fr) * 1990-02-23 1991-08-28 Institut Français du Pétrole Dispostif de pré-traitement de déchets plastiques avant recyclage
WO1994007780A1 (fr) * 1992-09-29 1994-04-14 Siemens Aktiengesellschaft Dispositif de transport a vis transporteuse
WO1998039154A1 (fr) * 1997-03-06 1998-09-11 Spirac Engineering Ab Dispositif de compression
EP1025984A1 (fr) * 1999-02-01 2000-08-09 Bormet Maschinenbau GmbH Presse transporteuse
WO2000073049A1 (fr) * 1999-05-31 2000-12-07 Spirac Engineering Ab Appareil de separation

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9103451L (sv) * 1991-11-19 1993-05-20 Spirac Engineering Ab Last- och komprimeringsanordning
US5421251A (en) * 1991-11-19 1995-06-06 Spirac Engineering Ab Apparatus for compacting material
DE4420976C2 (de) * 1994-06-16 1997-02-06 Voith Sulzer Stoffaufbereitung Verfahren und Vorrichtung zum kontrollierten Transport von eingedicktem Faserstoff aus einem unter Überdruck stehenden Raum

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1494284A (fr) * 1966-07-27 1967-09-08 So Ma Vi Dispositif de réglage pour pressoirs continus
AT295277B (de) * 1970-02-10 1971-12-27 Boehler & Co Ag Geb Schneckenpresse zur Herstellung der Ummantelungen von Schweißelektroden
DE3002326A1 (de) * 1979-01-23 1980-08-07 Murat Vas Muratidis & Co A I S Schneckenfoerderer
FR2522585A1 (fr) * 1982-03-02 1983-09-09 Somavi Pressoir a vis

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1494284A (fr) * 1966-07-27 1967-09-08 So Ma Vi Dispositif de réglage pour pressoirs continus
AT295277B (de) * 1970-02-10 1971-12-27 Boehler & Co Ag Geb Schneckenpresse zur Herstellung der Ummantelungen von Schweißelektroden
DE3002326A1 (de) * 1979-01-23 1980-08-07 Murat Vas Muratidis & Co A I S Schneckenfoerderer
FR2522585A1 (fr) * 1982-03-02 1983-09-09 Somavi Pressoir a vis

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5012731A (en) * 1985-06-26 1991-05-07 Yves Maisonneuve Device for pressing heterogeneous mixtures with regulated pressing force for separating liquid and solid fractions thereof, in particular fruit juices
EP0219785A2 (fr) * 1985-10-18 1987-04-29 Spirac Engineering Ab Dispositif pour le compactage de matériau et la réduction de sa teneur en liquide
US4779528A (en) * 1985-10-18 1988-10-25 Spirac Engineering Ab Floating shaftless helix screw press
EP0219785A3 (fr) * 1985-10-18 1988-12-14 Spirac Engineering Ab Dispositif pour le compactage de matériau et la réduction de sa teneur en liquide
US4961864A (en) * 1988-02-29 1990-10-09 Spirac Engineering Ab Separating device
EP0396392A1 (fr) * 1989-05-01 1990-11-07 Larry E. Koenig Déchiqueteur
EP0443961A1 (fr) * 1990-02-23 1991-08-28 Institut Français du Pétrole Dispostif de pré-traitement de déchets plastiques avant recyclage
WO1994007780A1 (fr) * 1992-09-29 1994-04-14 Siemens Aktiengesellschaft Dispositif de transport a vis transporteuse
US5558203A (en) * 1992-09-29 1996-09-24 Siemens Aktiengesellschaft Transporting device
WO1998039154A1 (fr) * 1997-03-06 1998-09-11 Spirac Engineering Ab Dispositif de compression
EP1025984A1 (fr) * 1999-02-01 2000-08-09 Bormet Maschinenbau GmbH Presse transporteuse
WO2000046019A1 (fr) * 1999-02-01 2000-08-10 Bormet Maschinenbau Gmbh Presse a convoyeur
WO2000073049A1 (fr) * 1999-05-31 2000-12-07 Spirac Engineering Ab Appareil de separation

Also Published As

Publication number Publication date
DE8590051U1 (de) 1986-04-03
EP0179842A1 (fr) 1986-05-07
DE3567597D1 (en) 1989-02-23
EP0179842B2 (fr) 1996-08-07
GB2169217A (en) 1986-07-09
SE8402202D0 (sv) 1984-04-19
GB2169217B (en) 1988-03-02
SE8402202L (sv) 1985-10-20
DE8590093U1 (de) 1986-04-10
GB8529528D0 (en) 1986-01-08
EP0179842B1 (fr) 1989-01-18
SE446956B (sv) 1986-10-20

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