WO1992005885A1 - A dosing device for a high-pressure-cleaner - Google Patents

A dosing device for a high-pressure-cleaner Download PDF

Info

Publication number
WO1992005885A1
WO1992005885A1 PCT/DK1991/000296 DK9100296W WO9205885A1 WO 1992005885 A1 WO1992005885 A1 WO 1992005885A1 DK 9100296 W DK9100296 W DK 9100296W WO 9205885 A1 WO9205885 A1 WO 9205885A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
dosing
pressure cleaner
pump piston
dosing device
Prior art date
Application number
PCT/DK1991/000296
Other languages
French (fr)
Inventor
Jens Bovbjerg
Original Assignee
K.F. Industri A/S
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 K.F. Industri A/S filed Critical K.F. Industri A/S
Publication of WO1992005885A1 publication Critical patent/WO1992005885A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/244—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using carrying liquid for feeding, e.g. by suction, pressure or dissolution, a carried liquid from the container to the nozzle
    • B05B7/2443—Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using carrying liquid for feeding, e.g. by suction, pressure or dissolution, a carried liquid from the container to the nozzle the carried liquid and the main stream of carrying liquid being brought together downstream of the container before discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • the present invention relates to a dosing device for a high-pressure cleaner and of the type described in the in ⁇ troductory part of claim 1.
  • High-pressure cleaners are gradually used for many diffe ⁇ rent purposes, where it is required to be able to mix dif ⁇ ferent additives, that is cleaning agents, into the liquid strea .
  • the most known high-pressure cleaners are working with an approximately constant liquid stream produced by a pump with several pistons, that is three pistons driven by a re ⁇ volving inclined disc which again is driven with constant speed of rotation by an electric motor.
  • the capacity of the high-pressure cleaner is adjusted by a so-called bypass, so that some of the liquid stream may be lead back to the suc ⁇ tion side of the pump. Therefore known dosing devices are working after the injector principle, where a so-called Venturi nozzle is used, that means that the dose of additi ⁇ ves is determined by the actual flow speed of the liquid stream.
  • the invention is related to Danish Patent Application No. 0724/90 disclosing a high-pressure cleaner operating with one pump piston being drive connected di ⁇ rectly with an driving piston of an internal combustion en ⁇ gine.
  • the invention has for its purpose to provide a dosing devi ⁇ ce of the type mentioned initially, which by simple provi ⁇ sions makes it possible to obtain an improvement of the do ⁇ sing of additives in connection with the actual type of high-pressure cleaner.
  • the dosing device according to the invention is distinctive in that the dosing pump is adapted to be drived by the ac ⁇ tion of the pulsating pressure of the liquid stream from the high-pressure cleaner, as the dosing pump as known per se comprise a pump chamber with a spring activated pump pi ⁇ ston with a central axial pump channel, which on the deli ⁇ very side cooperate with a ball valve, being adapted to close the pump channel, when the pump piston is moved in the direction away from the supply bottle, as the pump chamber comprises another ball valve being adapted to close a suction channel to the suction tube, when the pump piston is moved towards the supply bottle, respectively.
  • a dosing device which is suitable for insertion between a jet pipe with tilting nozzle with reference to a restrained dosing of different additives for liquid flow.
  • the dosing device may (at a run idle about 3,000 rpm of the drive engine of the high-pressure cleaner) give an additive dosing of about 1% or about 30 ml/min. at a primary liquid stream of about 3 1/min and a pulsation frequency of about 50 Hz.
  • the dosing device is such provided that the pump piston is adapted to be mo ⁇ ved a very short distance in the pump chamber, preferably of the order of 0.5 - 1.5 mm, and that the pump piston is supported on O-ring-tightenings, preferably three O-ring- tightenings constituting said spring activation means for the pump piston.
  • the dosing device preferably operates by reduced primary liquid stream, which expediently may be ob ⁇ tained by the fact that the dosing device is adapted to work with a pulsating frequency of 50 Hz - 150 Hz, prefe ⁇ rably about 100 Hz, and that the connecting part connected with the, high-pressure cleaner may be adapted to comprise a suitable reduction nozzle.
  • Fig. 1 shows an embodiment for a dosing device according to the invention
  • Fig. 2 shows an example for a pressure/time graph for the pulsating primary liquid stream from the high-pressure cleaner driving the dosing device.
  • the dosing device 2 shown in Fig. 1 comprises a generally cylindrical device housing 4 with a central channel 6 for the primary liquid stream by way of example from a high- pressure cleaner cfr. the Danish Patent Application No. 0724/90, to which the dosing device may be connected by means of a connecting part 8 consisting of an outer projec ⁇ ting part 10 of the central channel 6 and a ring-shaped holding member 12 surrounding the projecting part 10 and which opposite the latter is secured to the cylindrical housing 4, which downward is provided with a projecting threaded stub 14, by means of which a supply bottle 16 containing an additive may be screw-connected onto the hou- sing 4.
  • a connecting part 8 consisting of an outer projec ⁇ ting part 10 of the central channel 6 and a ring-shaped holding member 12 surrounding the projecting part 10 and which opposite the latter is secured to the cylindrical housing 4, which downward is provided with a projecting threaded stub 14, by means of which a supply bottle 16 containing an additive may be screw-connected onto the hou
  • the dosing device 2 is pro ⁇ vided with another connecting part 18 made in one piece with the housing 4.
  • a jet pipe 20 with a coupling part 22 may be connected and secured to the housing 4, as a pipe-shaped connection stub 24 of the coupling part 22 is adapted to be inserted into socket tube 26 placed in front of and connected with the central channel 6.
  • the socket tube is surrounded by a sta ⁇ tionary ring-shaped holding part 28, which along its peri- phery is slotted to form of a number of holding fingers 30, which at outer free ends has inner projections 32 adapted to grasp a ring shaped recess 34 behind an outer collar part 36 of the coupling part 22 of the jet pipe 20, when an outer lock ring 38 with an inner wedge surface 40 is moved inwardly over the holding part 28 and squeezes the holding fingers 30 around the outer collar part 36 of the coupling part, so that the jet pipe 20 is prevented to be displaced in axial direction in relation to the dosing device 2.
  • the dosing device 2 comprises a dosing pump 42 being arran ⁇ ged co-axial to the threaded stub 14 inside this.
  • the do ⁇ sing device 42 consists of a pump housing 44 connected with the central channel 6 by means of a downward leading ring member 46, as the pump housing 44 is provided in a cylin- drical housing part 48 being inserted over the ring member 46 and secured thereto by means of glue since furthermore a central part 50 of the pump housing 44 is inserted up into the ring member 46.
  • the pump housing 44 comprises an upper pump chamber 52 and a lower suction chamber 54 together with a differential pump piston 56, of which an upper part 58 with large diameter is placed inside the pump chamber 52, while a lower part 60 of the pump piston 56 with small diameter is placed inside the suction chamber 54.
  • the pump piston 56 is provided with a central pump channel 62 which at an upper end being closed by means of a ball valve 64 and which is open downward towards the suction chamber 54.
  • the suction chamber 54 is per se closed by a suction chan ⁇ nel 66 by means of a lower ball valve 68 as the suction channel 66 is provided as a tube stub 70 for the suction tube 72 being lead downward in the supply bottle 16.
  • the upper part 58 of the pump piston 56 is provided with a tightening ring in the shape of an O-ring 74 gliding to ⁇ wards the cylindric wall of the upper pump chamber 52.
  • the pump piston 56 is at the top of the narrow part 60 lead through three O-rings 76, which partly make up an effective lower tightening towards the suction chamber 54 and partly function as a resilerted support for the punp piston 56, whose stroke is very small - of the order of 0.5 - 1.5 mm, as the pump piston 56 is prevented in moving itself upward by means of a ring-shaped impact 78 inside of the ring mem ⁇ ber 46 and of another ring member 80 partly being surroun ⁇ ded by the upper ball valve 64.
  • the upper ring member 80 is at the upper end connected with the central channel 6 of the dosing device via a radial bore 82 placed in front of a narrow part of the central channel 6 having a slightly increased cross section to both sides of the radial bore 82 to the dosing pump 42.
  • the projecting part 10 of the connection part 8 is at the end provided with a reduction nozzle 84 being only squeezed into the open end portion of the projecting part 10 having a nozzle opening in the direction towards the dosing device 2 with a diameter of about 0.75 mm - corresponding to a a- ximum liquid flow of about 3 1/min - or corresponding to an idle running output of the belonging high-pressure cleaner preferably drived by a small petrol engine directly drive connected with the pump piston of the high-pressure clea ⁇ ner.
  • the dosing pump 42 is drived by the pulsating liquid flow of the connected high-pressure cleaner having a time/pres ⁇ sure graph as an example shown in fig. 2 as the high-pres ⁇ sure cleaner is drived by one pump piston having the same pump stroke frequency as the speed of rotation of the pe ⁇ trol engine - this is from about 3,000 - about 9,000 stroke per min corresponding to about 50 Hz about 150 Hz.

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Abstract

A dosing device (2) for a high-pressure cleaner with a single pump piston driven by internal combustion engine, and with a connecting part (8) being adapted to be connected with a discharge connection of the high-pressure cleaner, a connecting part (18) being adapted to be connected with a jet pipe with a spray nozzle, a - between the connecting parts - stretching channel (6) connected with a dosing pump (42) with a suction tube (72) projecting into a supply bottle (16) for an additive to be mixed with the liquid stream from the high-pressure cleaner, the dosing pump (42) is adapted to be driven by the action of the pulsating pressure of the liquid stream from the high-pressure cleaner, as the dosing pump (2) as known per se comprises a pump chamber (52) with a spring activated pump piston (56) with a central axial pump channel (62), which on the delivery side cooperate with a ball valve (64), being adapted to close the pump channel (62), when the pump piston (56) is moved from the supply bottle (16), as the pump chamber (52) comprises another ball valve (68) being adapted to close a suction channel (66) to the suction tube (72), when the pump piston (56) is moved towards the supply bottle (16), respectively.

Description

A DOSING DEVICE FOR A HIGH-PRESSURE-CLEANER.
The present invention relates to a dosing device for a high-pressure cleaner and of the type described in the in¬ troductory part of claim 1.
High-pressure cleaners are gradually used for many diffe¬ rent purposes, where it is required to be able to mix dif¬ ferent additives, that is cleaning agents, into the liquid strea .
The most known high-pressure cleaners are working with an approximately constant liquid stream produced by a pump with several pistons, that is three pistons driven by a re¬ volving inclined disc which again is driven with constant speed of rotation by an electric motor. The capacity of the high-pressure cleaner is adjusted by a so-called bypass, so that some of the liquid stream may be lead back to the suc¬ tion side of the pump. Therefore known dosing devices are working after the injector principle, where a so-called Venturi nozzle is used, that means that the dose of additi¬ ves is determined by the actual flow speed of the liquid stream.
Particularly, the invention is related to Danish Patent Application No. 0724/90 disclosing a high-pressure cleaner operating with one pump piston being drive connected di¬ rectly with an driving piston of an internal combustion en¬ gine.
The invention has for its purpose to provide a dosing devi¬ ce of the type mentioned initially, which by simple provi¬ sions makes it possible to obtain an improvement of the do¬ sing of additives in connection with the actual type of high-pressure cleaner. The dosing device according to the invention is distinctive in that the dosing pump is adapted to be drived by the ac¬ tion of the pulsating pressure of the liquid stream from the high-pressure cleaner, as the dosing pump as known per se comprise a pump chamber with a spring activated pump pi¬ ston with a central axial pump channel, which on the deli¬ very side cooperate with a ball valve, being adapted to close the pump channel, when the pump piston is moved in the direction away from the supply bottle, as the pump chamber comprises another ball valve being adapted to close a suction channel to the suction tube, when the pump piston is moved towards the supply bottle, respectively.
By means of simple provisions a dosing device is obtained, which is suitable for insertion between a jet pipe with tilting nozzle with reference to a restrained dosing of different additives for liquid flow. By addition of active foamsoap for carwash the dosing device may (at a run idle about 3,000 rpm of the drive engine of the high-pressure cleaner) give an additive dosing of about 1% or about 30 ml/min. at a primary liquid stream of about 3 1/min and a pulsation frequency of about 50 Hz.
Expediently, the dosing device according to the invention is such provided that the pump piston is adapted to be mo¬ ved a very short distance in the pump chamber, preferably of the order of 0.5 - 1.5 mm, and that the pump piston is supported on O-ring-tightenings, preferably three O-ring- tightenings constituting said spring activation means for the pump piston.
During operation the dosing device preferably operates by reduced primary liquid stream, which expediently may be ob¬ tained by the fact that the dosing device is adapted to work with a pulsating frequency of 50 Hz - 150 Hz, prefe¬ rably about 100 Hz, and that the connecting part connected with the, high-pressure cleaner may be adapted to comprise a suitable reduction nozzle.
By making use of a reduction nozzle with a bore with a dia- meter of 0.75 mm a physical reduction of the primary liquid stream of the high-pressure cleaner of the said amount (1/min) may be obtained, so that the consumption of relati¬ ve expensive active foamsoap may be reduced accordingly to about 30 ml/min. That means that a supply bottle with a content of about 270 ml suffices an operation time of about 9 min corresponding some 4 - 5 carwashes.
In the following the invention is described in more details with reference to the drawing, in which:-
Fig. 1 shows an embodiment for a dosing device according to the invention, and
Fig. 2 shows an example for a pressure/time graph for the pulsating primary liquid stream from the high-pressure cleaner driving the dosing device.
The dosing device 2 shown in Fig. 1 comprises a generally cylindrical device housing 4 with a central channel 6 for the primary liquid stream by way of example from a high- pressure cleaner cfr. the Danish Patent Application No. 0724/90, to which the dosing device may be connected by means of a connecting part 8 consisting of an outer projec¬ ting part 10 of the central channel 6 and a ring-shaped holding member 12 surrounding the projecting part 10 and which opposite the latter is secured to the cylindrical housing 4, which downward is provided with a projecting threaded stub 14, by means of which a supply bottle 16 containing an additive may be screw-connected onto the hou- sing 4. Opposite the connecting part 8 the dosing device 2 is pro¬ vided with another connecting part 18 made in one piece with the housing 4. By means of the connecting part 18 a jet pipe 20 with a coupling part 22 may be connected and secured to the housing 4, as a pipe-shaped connection stub 24 of the coupling part 22 is adapted to be inserted into socket tube 26 placed in front of and connected with the central channel 6. The socket tube is surrounded by a sta¬ tionary ring-shaped holding part 28, which along its peri- phery is slotted to form of a number of holding fingers 30, which at outer free ends has inner projections 32 adapted to grasp a ring shaped recess 34 behind an outer collar part 36 of the coupling part 22 of the jet pipe 20, when an outer lock ring 38 with an inner wedge surface 40 is moved inwardly over the holding part 28 and squeezes the holding fingers 30 around the outer collar part 36 of the coupling part, so that the jet pipe 20 is prevented to be displaced in axial direction in relation to the dosing device 2.
The dosing device 2 comprises a dosing pump 42 being arran¬ ged co-axial to the threaded stub 14 inside this. The do¬ sing device 42 consists of a pump housing 44 connected with the central channel 6 by means of a downward leading ring member 46, as the pump housing 44 is provided in a cylin- drical housing part 48 being inserted over the ring member 46 and secured thereto by means of glue since furthermore a central part 50 of the pump housing 44 is inserted up into the ring member 46. The pump housing 44 comprises an upper pump chamber 52 and a lower suction chamber 54 together with a differential pump piston 56, of which an upper part 58 with large diameter is placed inside the pump chamber 52, while a lower part 60 of the pump piston 56 with small diameter is placed inside the suction chamber 54. The pump piston 56 is provided with a central pump channel 62 which at an upper end being closed by means of a ball valve 64 and which is open downward towards the suction chamber 54. The suction chamber 54 is per se closed by a suction chan¬ nel 66 by means of a lower ball valve 68 as the suction channel 66 is provided as a tube stub 70 for the suction tube 72 being lead downward in the supply bottle 16.
The upper part 58 of the pump piston 56 is provided with a tightening ring in the shape of an O-ring 74 gliding to¬ wards the cylindric wall of the upper pump chamber 52. The pump piston 56 is at the top of the narrow part 60 lead through three O-rings 76, which partly make up an effective lower tightening towards the suction chamber 54 and partly function as a resilerted support for the punp piston 56, whose stroke is very small - of the order of 0.5 - 1.5 mm, as the pump piston 56 is prevented in moving itself upward by means of a ring-shaped impact 78 inside of the ring mem¬ ber 46 and of another ring member 80 partly being surroun¬ ded by the upper ball valve 64.
The upper ring member 80 is at the upper end connected with the central channel 6 of the dosing device via a radial bore 82 placed in front of a narrow part of the central channel 6 having a slightly increased cross section to both sides of the radial bore 82 to the dosing pump 42.
The projecting part 10 of the connection part 8 is at the end provided with a reduction nozzle 84 being only squeezed into the open end portion of the projecting part 10 having a nozzle opening in the direction towards the dosing device 2 with a diameter of about 0.75 mm - corresponding to a a- ximum liquid flow of about 3 1/min - or corresponding to an idle running output of the belonging high-pressure cleaner preferably drived by a small petrol engine directly drive connected with the pump piston of the high-pressure clea¬ ner. The dosing pump 42 is drived by the pulsating liquid flow of the connected high-pressure cleaner having a time/pres¬ sure graph as an example shown in fig. 2 as the high-pres¬ sure cleaner is drived by one pump piston having the same pump stroke frequency as the speed of rotation of the pe¬ trol engine - this is from about 3,000 - about 9,000 stroke per min corresponding to about 50 Hz about 150 Hz.
But as earlier mentioned it is preferred in consideration of the best possible exploit of the different additives to work with reduced performance of the dosing device, why the primary, driving liquid flow through the central channel 6 of the dosing device is reduced by means of for instance the said reduction nozzle 84.

Claims

C L A I M S :
1. A dosing device (2) for a high-pressure cleaner, parti¬ cularly a high-pressure cleaner with a single pump piston drived by an internal combustion engine, and with a connec- 5 ting part (8) being adapted to be connected with a dischar¬ ge connection of the high-pressure cleaner, a connecting part (18) being adapted to be connected with a jet pipe (20) with a spray nozzle, a between the connecting parts (8, 18) stretching channel (6) connected with a dosing pump
10 (42) with a suction tube (72) projecting into a supply bottle (16) for an additive to be mixed with the liquid stream from the high-pressure cleaner, as a connecting stub of the supply bottle (16) surrounding the dosing pump (42) and is tightly connected with the dosing device (2) , c h a- lδ r a c t e r i z e d in that the dosing pump (42) is adap¬ ted to be drived by the action of the pulsating pressure of the liquid stream from the high-pressure cleaner, as the dosing pump (42) as known per se comprises a pump chamber (52) with a spring activated pump piston (56) with a cent- 0 ral axial pump channel (62), which on the delivery side cooperate with a ball valve (64), being adapted to close the pump channel (62) , when the pump piston (56) is moved in the direction away from the supply bottle (16) , as the pump chamber (52) comprises another ball valve (68) being 5 adapted to close a suction channel 66) to the suction tube (72) , when the pump piston (56) is moved towards the supply bottle (16) , respectively.
2. A dosing device (2) according to claim 1, c h a r a c- 0 t e r i z e d in that the pump piston (56) is adapted to be moved a very short distance in the pump chamber (52) , preferably of the order of 0.5 - 1.5 mm, and that the pump piston is supported on O-ring-tighteningε, preferably three O-ring-tightenings (76) constituting said spring activating 5 means for the pump piston (56) .
3. A dosing device (2) according to claims l and 2, c h a¬ r a c t e r i z e d in that the dosing device is adapted to be operated with a pulsating frequency of 50 - 150 Hz, preferably about 100 Hz, and that the connecting part (8) connected with the high-pressure cleaner may be adapted to comprise a suitable reduction nozzle.
PCT/DK1991/000296 1990-10-01 1991-09-30 A dosing device for a high-pressure-cleaner WO1992005885A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK235990A DK167055B1 (en) 1990-10-01 1990-10-01 DOSAGE DEVICE FOR HIGH PRESSURE CLEANERS
DK2359/90 1990-10-01

Publications (1)

Publication Number Publication Date
WO1992005885A1 true WO1992005885A1 (en) 1992-04-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1991/000296 WO1992005885A1 (en) 1990-10-01 1991-09-30 A dosing device for a high-pressure-cleaner

Country Status (3)

Country Link
AU (1) AU8549191A (en)
DK (1) DK167055B1 (en)
WO (1) WO1992005885A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001030507A1 (en) * 1999-10-28 2001-05-03 Tetrosyl Limited A dispenser
EP1022060A3 (en) * 1999-01-22 2002-01-23 Griffin LL.C Method and apparatus for dispensing multiple-component flowable substances
CN113108106A (en) * 2021-03-05 2021-07-13 邢浩 Pulsation type feeding metering valve

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103691719B (en) * 2013-12-20 2015-09-09 广州达意隆包装机械股份有限公司 A kind of Medium diversion plate of bottle cleaning machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761734A (en) * 1955-06-03 1956-09-04 Farmer Alfred Spray device
DE3248622C2 (en) * 1982-12-30 1985-10-17 Alfred Kärcher GmbH & Co, 7057 Winnenden High pressure cleaning device
EP0207501A2 (en) * 1985-07-05 1987-01-07 K.E.W. Industri A/S An automatic aspirator-transfer valve, and a jet washing apparatus comprising such a valve

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761734A (en) * 1955-06-03 1956-09-04 Farmer Alfred Spray device
DE3248622C2 (en) * 1982-12-30 1985-10-17 Alfred Kärcher GmbH & Co, 7057 Winnenden High pressure cleaning device
EP0207501A2 (en) * 1985-07-05 1987-01-07 K.E.W. Industri A/S An automatic aspirator-transfer valve, and a jet washing apparatus comprising such a valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1022060A3 (en) * 1999-01-22 2002-01-23 Griffin LL.C Method and apparatus for dispensing multiple-component flowable substances
WO2001030507A1 (en) * 1999-10-28 2001-05-03 Tetrosyl Limited A dispenser
CN113108106A (en) * 2021-03-05 2021-07-13 邢浩 Pulsation type feeding metering valve

Also Published As

Publication number Publication date
AU8549191A (en) 1992-04-28
DK235990D0 (en) 1990-10-01
DK235990A (en) 1992-04-02
DK167055B1 (en) 1993-08-23

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