CA1144111A - Grading plant - Google Patents
Grading plantInfo
- Publication number
- CA1144111A CA1144111A CA000355806A CA355806A CA1144111A CA 1144111 A CA1144111 A CA 1144111A CA 000355806 A CA000355806 A CA 000355806A CA 355806 A CA355806 A CA 355806A CA 1144111 A CA1144111 A CA 1144111A
- Authority
- CA
- Canada
- Prior art keywords
- carriage
- screen
- grading plant
- wires
- horizontal
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/50—Cleaning
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Confectionery (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
Abstract
ABSTRACT
A grading plant with self-cleaning screen for lump materials, the screen being pivotally mounted to a carriage displaceable on horizontal beams. The screen has wheels guided in tracks in the beams. Each track has a horizontal portion and a curved downwards directed portion. The screen is in a position for discharging when the wheels are in the lowermost part of the downwards directed portion. The motion of the screen is exerted by a moving device consisting of a wire arrangement for the backwards directed movement and a return spring for the return motion, or a double-acting hydraulic cylinder moving the carriage in both directions.
A grading plant with self-cleaning screen for lump materials, the screen being pivotally mounted to a carriage displaceable on horizontal beams. The screen has wheels guided in tracks in the beams. Each track has a horizontal portion and a curved downwards directed portion. The screen is in a position for discharging when the wheels are in the lowermost part of the downwards directed portion. The motion of the screen is exerted by a moving device consisting of a wire arrangement for the backwards directed movement and a return spring for the return motion, or a double-acting hydraulic cylinder moving the carriage in both directions.
Description
~14~111 _GRADING PLANT
The invention relates to a grading plant comprising a self-cleaning screen for lump materials retaining oversize fractions compared wi-th a predetermined material size, the screen being displaceable by means of a moving device backwards from a horizontal sorting position to a vertical discharging position, and forwards back to the sorting position, the screen being guided in tracks with a horizontal portion and a curved downwards directed portion in connection with the horizontal portion.
Such grading plants are utilized to retain oversize fractions of lump materials which are to be carried through stone crushing plants and used e.g. for levelling on bui]ding and constructions sites.
T~e operation of crushing plants may from time to time be stopped during long periods caused by jamming of too big blocks between the breaker plates. Removing of such blocks may be very work consuming and take a long time during which 20 the production of the crushing plant will be strongly reduced.
Thus, a strong demand exists to provide equipment which can sort out oversize fractions of rocks before the materials are put into the crushing plant, thereby ensuring continuous operation.
At constructions sites where lump materials are taken out for later use as filling materials by levelling works, road building, etc., it is desireable to be able to carry out a safe construction of such base layers by as far as possible using approximately homogeneous materials ensuring the stability. By retaining undesired fractions, this may to a great extent be achieved.
US-PS Nos. 2 396 954, 2 690 840 and 3 402 816 disclose grading plants with screens pivoted upwards for discharging retained fractions. The patent specifications disclose a screen which may be pivoted about an axis at one end of the screen.
This means that the distance from the place where the sorted fraction falls down to t~at place where the retained fraction is discharged is comparatively small. Discharging of the retained fraction demands by certain solutions a high amount ~lA41~:~
of force, depending on the quantlty of the fraction which is to be discharged. Discharg:Lng is ef~ec~ed ~y means of engine and mechanical trans~issions or hydraulically.
US-PS 1 685 823 discloses a screen which is movable on wheels along a track containing a horizontal p~rtion and a curved portion, whereby the screen is pushed until the wheels are in the curved part, whereby the retained fraction is discharged and a spring is tensioned, which spring there-upon moves the screen back to the star-ting position. As the entire screen with its relativeiy large weight is pivoted so that the center of gravity is displaced a considerable vertical distance downwards, a disproportional strong spring is required to absorb sufficient energy as to move the screen back to the correct starting position.
N0-PS 117 159 discloses a screen with two pairs of wheels where the pairs are guided in straight tracks forming an acute angle relative to each other. This solution gives an uncontrolled discharging of the screen, as the motion of the screen towards the discharging position starts when the weight on the protruding part of the screen exceeds a certain value, whereas the returning motion of the screen starts when the weight balance ùpon discharging of the retained fraction is displaced so much that the center of gravity no longer is located in the protruding part. To start the discharging motion of the screen, the materials preferably have to be put on the protruding part of the screen.
The return motion of the screens according to the two last mentioned patent specifications is not ensured to be executed quite forwards to the sorting position.
It is an ob~ect of the present invention to provide a grading plant which ensures effective discharging of the retained fraction at a safe distance from the position where the sorted fraction falls down and to ensure a correct return motion of the screen to the starting position, combined with a simple and rugged design.
The grading plant according to the invention is of the type set forth above and is constructed as a portal where the transportation lorry may be placed for collection of the _ 1~44~
sorted fractions. Basically, the invention provides a gradi.ng plant including a self-cleaning screen for receiving lump materials and retaining oversize fractions thereof a~ove a predetermined sizeJ movement means for displacing the screen from a horizontal sorting position to a vertical discharging position and back to the sorting position, and tracks for guiding the screen during its displacement, said tracks having a horizontal portion and a curved, downwardly directed portion connected to the horizontal portion, comprising: a carriage, bearings for pivotally supporting the screen approxi-mately in a lateral center of gravity axis in the sides of the carriage, first wheels attached to th.e sides of the carriage in rolling engagement with fixed horizontal beams of the grading plant below the sides of the carriage to enable its horizontal displacement,and two second wheels attached to the rear end of the screen and individually guided in the tracks provided with each horizontal beam, the screen being in a position for discharging the retained fractions when the second wheels are in a lower part of the curved portion of the tracks, and in a sorting position when the second wheels are in a forward part of the horizontal portion of the tracks.
Preferably, the movement means comprises two symmetrically arranged wires each attached at one end to a bracket at a rear end of each beam, guide discs for the wires attached to a front end of the carriage, guide pulleys for the wires fixed relative to each beam at opposite sides of a longitudinal axis of symmetry of the carriage, and a movable disengage-ment lever connected to the other ends of the wires, whereby movement of the lever away from the carriage causes tens:ion of the wires and, by pressure exerted against the discs, displaces the carriage in a direction away from the lever and towards the rear end of the beams.
Preferably also, the discs are individually mounted on two locking means locking the carriage when the screen is in the sorting position, each 'B~
locking means comprising a plate pivotally mounted to the front end of the carriage and having a hook biased by a spring, acting on the plate, into engagement with a corresponding hook mounted on the beam, the locking means releasing the carriage in response to the wires being tensioned by moving the disengagement lever in a direction away from the carriage.
The grading plant may further comprise a return spring mounted on the rear end of each beam for absorbing the kinetic energy of the carriage and the retained fractions on the screen, and for releasing said energy to return the discharged carriage back to its sorting position.
In another emhodiment, the movement means comprises a double-acting hydraulic cylinder mounted on each beam in the longitudinal dirèction thereof, and a piston of the cylinder connected to the carriage for implementing a reciprocating motion of the carriage.
In the following the invention will be further described by way of example with reference to the accompanying drawings) in which Fig. 1 illustrates a side elevation of the grading plant;
Fig. 2 illustrates a plan view of the wire arrangement;
Fig. 3 shows a detail illustration of the plate of the locking arrangement; and Fig. 4 shows in perspective an embodiment with hydraulic cylinders for the motion of the carriage.
A carriage 2 can roll on beams 1 by means of wheels 4. The carriage 2 comprises a frame and has a screen 3 which is arranged within the frame and is pivotally mounted in pivoting supports 13 in the center axis of gravity. On the screen 3 are mounted two wheels 5 which can roll on a horizontal portion 11 and a curved portion 12 as a continuation thereto of a track mounted to each beam. Rock materials are filled into the screen 3 and the sorted fraction is falling down through the screen on a su;table transportation ~i , 114~
4a machine ~not shown~ below the heams 1, within the portal of the grading plant. The loading machine e.g. a shovel loader, which has delivered the materials on the screen, thereafter pulls a disengagement lever 6 to the left in Fig. 1, whereby a wire 7 is tightened, a locking plate 16 is turned towards the axis of symmetry of the grading plant, there~y releasing the locking plate 16, whereafter the carriage 2 with its load is forced to the right in Fig. 1, caused by the tightening of the wire 7 between a pulley 8 and a wire bracket 10, and against a disc 9 on the carriage. When the carriage is moved to the right in Fig. 1, the screen will stay in the same position by means of the wheel 5 until the wheel 5 enters the curved portion 12 of the track, whereby the screen will be turned to a position wherein the upper surface of the screen forms an angle of less than 90 with the horizontal plane. Hereby the retained fraction 1~4~
5~
will fall down on the right side of the grading plant as shown in Fig. 1. When the screen achieves its discharging position, the carriage 2 will have compressed a return spring 20, whereafter the spring 20 gives off its absorbed energy by pushing the carriage 2 back to the left in Fig. 1. The spring 20 has absorbed the energy from the carriage with the retained fraction, and this energy is sufficient to bring the carriage 2 back to the starting position, where the screen 3 is in the sorting position and where a hook 15 on the locking plate 16 engages another hook on the beam 1, thereby locking the carriage in this position. As the carriage 2 moves back to the starting position, the disc will tighten the wire 7 and bring back the disengagement lever 6 to its vertical initial position. ~hen the carriage
The invention relates to a grading plant comprising a self-cleaning screen for lump materials retaining oversize fractions compared wi-th a predetermined material size, the screen being displaceable by means of a moving device backwards from a horizontal sorting position to a vertical discharging position, and forwards back to the sorting position, the screen being guided in tracks with a horizontal portion and a curved downwards directed portion in connection with the horizontal portion.
Such grading plants are utilized to retain oversize fractions of lump materials which are to be carried through stone crushing plants and used e.g. for levelling on bui]ding and constructions sites.
T~e operation of crushing plants may from time to time be stopped during long periods caused by jamming of too big blocks between the breaker plates. Removing of such blocks may be very work consuming and take a long time during which 20 the production of the crushing plant will be strongly reduced.
Thus, a strong demand exists to provide equipment which can sort out oversize fractions of rocks before the materials are put into the crushing plant, thereby ensuring continuous operation.
At constructions sites where lump materials are taken out for later use as filling materials by levelling works, road building, etc., it is desireable to be able to carry out a safe construction of such base layers by as far as possible using approximately homogeneous materials ensuring the stability. By retaining undesired fractions, this may to a great extent be achieved.
US-PS Nos. 2 396 954, 2 690 840 and 3 402 816 disclose grading plants with screens pivoted upwards for discharging retained fractions. The patent specifications disclose a screen which may be pivoted about an axis at one end of the screen.
This means that the distance from the place where the sorted fraction falls down to t~at place where the retained fraction is discharged is comparatively small. Discharging of the retained fraction demands by certain solutions a high amount ~lA41~:~
of force, depending on the quantlty of the fraction which is to be discharged. Discharg:Lng is ef~ec~ed ~y means of engine and mechanical trans~issions or hydraulically.
US-PS 1 685 823 discloses a screen which is movable on wheels along a track containing a horizontal p~rtion and a curved portion, whereby the screen is pushed until the wheels are in the curved part, whereby the retained fraction is discharged and a spring is tensioned, which spring there-upon moves the screen back to the star-ting position. As the entire screen with its relativeiy large weight is pivoted so that the center of gravity is displaced a considerable vertical distance downwards, a disproportional strong spring is required to absorb sufficient energy as to move the screen back to the correct starting position.
N0-PS 117 159 discloses a screen with two pairs of wheels where the pairs are guided in straight tracks forming an acute angle relative to each other. This solution gives an uncontrolled discharging of the screen, as the motion of the screen towards the discharging position starts when the weight on the protruding part of the screen exceeds a certain value, whereas the returning motion of the screen starts when the weight balance ùpon discharging of the retained fraction is displaced so much that the center of gravity no longer is located in the protruding part. To start the discharging motion of the screen, the materials preferably have to be put on the protruding part of the screen.
The return motion of the screens according to the two last mentioned patent specifications is not ensured to be executed quite forwards to the sorting position.
It is an ob~ect of the present invention to provide a grading plant which ensures effective discharging of the retained fraction at a safe distance from the position where the sorted fraction falls down and to ensure a correct return motion of the screen to the starting position, combined with a simple and rugged design.
The grading plant according to the invention is of the type set forth above and is constructed as a portal where the transportation lorry may be placed for collection of the _ 1~44~
sorted fractions. Basically, the invention provides a gradi.ng plant including a self-cleaning screen for receiving lump materials and retaining oversize fractions thereof a~ove a predetermined sizeJ movement means for displacing the screen from a horizontal sorting position to a vertical discharging position and back to the sorting position, and tracks for guiding the screen during its displacement, said tracks having a horizontal portion and a curved, downwardly directed portion connected to the horizontal portion, comprising: a carriage, bearings for pivotally supporting the screen approxi-mately in a lateral center of gravity axis in the sides of the carriage, first wheels attached to th.e sides of the carriage in rolling engagement with fixed horizontal beams of the grading plant below the sides of the carriage to enable its horizontal displacement,and two second wheels attached to the rear end of the screen and individually guided in the tracks provided with each horizontal beam, the screen being in a position for discharging the retained fractions when the second wheels are in a lower part of the curved portion of the tracks, and in a sorting position when the second wheels are in a forward part of the horizontal portion of the tracks.
Preferably, the movement means comprises two symmetrically arranged wires each attached at one end to a bracket at a rear end of each beam, guide discs for the wires attached to a front end of the carriage, guide pulleys for the wires fixed relative to each beam at opposite sides of a longitudinal axis of symmetry of the carriage, and a movable disengage-ment lever connected to the other ends of the wires, whereby movement of the lever away from the carriage causes tens:ion of the wires and, by pressure exerted against the discs, displaces the carriage in a direction away from the lever and towards the rear end of the beams.
Preferably also, the discs are individually mounted on two locking means locking the carriage when the screen is in the sorting position, each 'B~
locking means comprising a plate pivotally mounted to the front end of the carriage and having a hook biased by a spring, acting on the plate, into engagement with a corresponding hook mounted on the beam, the locking means releasing the carriage in response to the wires being tensioned by moving the disengagement lever in a direction away from the carriage.
The grading plant may further comprise a return spring mounted on the rear end of each beam for absorbing the kinetic energy of the carriage and the retained fractions on the screen, and for releasing said energy to return the discharged carriage back to its sorting position.
In another emhodiment, the movement means comprises a double-acting hydraulic cylinder mounted on each beam in the longitudinal dirèction thereof, and a piston of the cylinder connected to the carriage for implementing a reciprocating motion of the carriage.
In the following the invention will be further described by way of example with reference to the accompanying drawings) in which Fig. 1 illustrates a side elevation of the grading plant;
Fig. 2 illustrates a plan view of the wire arrangement;
Fig. 3 shows a detail illustration of the plate of the locking arrangement; and Fig. 4 shows in perspective an embodiment with hydraulic cylinders for the motion of the carriage.
A carriage 2 can roll on beams 1 by means of wheels 4. The carriage 2 comprises a frame and has a screen 3 which is arranged within the frame and is pivotally mounted in pivoting supports 13 in the center axis of gravity. On the screen 3 are mounted two wheels 5 which can roll on a horizontal portion 11 and a curved portion 12 as a continuation thereto of a track mounted to each beam. Rock materials are filled into the screen 3 and the sorted fraction is falling down through the screen on a su;table transportation ~i , 114~
4a machine ~not shown~ below the heams 1, within the portal of the grading plant. The loading machine e.g. a shovel loader, which has delivered the materials on the screen, thereafter pulls a disengagement lever 6 to the left in Fig. 1, whereby a wire 7 is tightened, a locking plate 16 is turned towards the axis of symmetry of the grading plant, there~y releasing the locking plate 16, whereafter the carriage 2 with its load is forced to the right in Fig. 1, caused by the tightening of the wire 7 between a pulley 8 and a wire bracket 10, and against a disc 9 on the carriage. When the carriage is moved to the right in Fig. 1, the screen will stay in the same position by means of the wheel 5 until the wheel 5 enters the curved portion 12 of the track, whereby the screen will be turned to a position wherein the upper surface of the screen forms an angle of less than 90 with the horizontal plane. Hereby the retained fraction 1~4~
5~
will fall down on the right side of the grading plant as shown in Fig. 1. When the screen achieves its discharging position, the carriage 2 will have compressed a return spring 20, whereafter the spring 20 gives off its absorbed energy by pushing the carriage 2 back to the left in Fig. 1. The spring 20 has absorbed the energy from the carriage with the retained fraction, and this energy is sufficient to bring the carriage 2 back to the starting position, where the screen 3 is in the sorting position and where a hook 15 on the locking plate 16 engages another hook on the beam 1, thereby locking the carriage in this position. As the carriage 2 moves back to the starting position, the disc will tighten the wire 7 and bring back the disengagement lever 6 to its vertical initial position. ~hen the carriage
2 is in the starting position, a spring 17 will press the locking plate 16 so as to bring the hook on the locking plate away from the axis of symmetry of the grading plant to engage another hook (not shown) on the beam.
In another embodiment~ two double-aCting hydraulic cylinders 18 are used to moye the carriage ~ from the starting position wherein the screen 3 is in the sorting position, to the rear position wherein the screen 3 is in the discharging position. Thereafter the hydraulic cylinders 18 move the carriage back to the starting position. The hydraulic cylinders 18 have a fixed working cycle consisting of a reciprocating motion. This working cycle may be started by means of radio control or by means of a signal from a mechanically activated electric switch, e.g. by the loading machine.
In another embodiment~ two double-aCting hydraulic cylinders 18 are used to moye the carriage ~ from the starting position wherein the screen 3 is in the sorting position, to the rear position wherein the screen 3 is in the discharging position. Thereafter the hydraulic cylinders 18 move the carriage back to the starting position. The hydraulic cylinders 18 have a fixed working cycle consisting of a reciprocating motion. This working cycle may be started by means of radio control or by means of a signal from a mechanically activated electric switch, e.g. by the loading machine.
Claims (5)
IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A grading plant including a self-cleaning screen for receiving lump materials and retaining oversize fractions thereof above a predetermined size, movement means for displacing the screen from a horizontal sorting position to a vertical discharging position and back to the sorting position, and tracks for guiding the screen during its displacement, said tracks having a hori-zontal portion and a curved, downwardly directed portion connected to the horizontal portion, comprising: a carriage, bearings for pivotally supporting the screen approximately in a lateral center of gravity axis in the sides of the carriage, first wheels attached to the sides of the carriage in rolling engagement with fixed horizontal beams of the grading plant below the sides of the carriage to enable its horizontal displacement, and two second wheels attached to the rear end of the screen and individually guided in the tracks provided with each horizontal beam, the screen being in a position for dis-charging the retained fractions when the second wheels are in a lower part of the curved portion of the tracks, and in a sorting position when the second wheels are in a forward part of the horizontal portion of the tracks.
2. A grading plant according to claim 1, wherein the movement means comprises two symmetrically arranged wires each attached at one end to a bracket at a rear end of each beam, guide discs for the wires attached to a front end of the carriage, guide pulleys for the wires fixed relative to each beam at opposite sides of a longitudinal axis of symmetry of the carriage, and a movable disengagement lever connected to the other ends of the wires, whereby movement of the lever away from the carriage causes tension of the wires and, by pressure exerted against the discs, displaces the carriage in a direction away from the lever and towards the rear end of the beams.
3. A grading plant according to claim 2, wherein the discs are indi-vidually mounted on two locking means locking the carriage when the screen is in the sorting position, each locking means comprising a plate pivotally mounted to the front end of the carriage and having a hook biased by a spring, acting on the plate, into engagement with a corresponding hook mounted on the beam, the locking means releasing the carriage in response to the wires being tensioned by moving the disengagement lever in a direction away from the carriage.
4. A grading plant according to claim 1, 2 or 3, further comprising a return spring mounted on the rear end of each beam for absorbing the kinetic energy of the carriage and the retained fractions on the screen, and for releasing said energy to return the discharged carriage back to its sorting position.
5. A grading plant according to claim 1, wherein the movement means comprises a double-acting hydraulic cylinder mounted on each beam in the longitudinal direction thereof, and a piston of the cylinder connected to the carriage for implementing a reciprocating motion of the carriage.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO792278 | 1979-07-09 | ||
| NO792278A NO144129C (en) | 1979-07-09 | 1979-07-09 | SORTING WORKS FOR MASS GOODS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1144111A true CA1144111A (en) | 1983-04-05 |
Family
ID=19884960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000355806A Expired CA1144111A (en) | 1979-07-09 | 1980-07-09 | Grading plant |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0031820B1 (en) |
| JP (1) | JPS6128387B2 (en) |
| BE (1) | BE884218A (en) |
| BR (1) | BR8008741A (en) |
| CA (1) | CA1144111A (en) |
| DE (1) | DE3065519D1 (en) |
| FI (1) | FI70381C (en) |
| NO (1) | NO144129C (en) |
| WO (1) | WO1981000066A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6712218B2 (en) | 2002-07-31 | 2004-03-30 | Klaas Nierop | Soil screener |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI124686B (en) | 2009-08-14 | 2014-12-15 | Forchem Oy | Method for refining crude tall oil |
| CN107442394B (en) * | 2017-03-31 | 2019-08-23 | 浙江恒大塑胶股份有限公司 | A kind of industrial sieving machines |
| CN107803255B (en) * | 2017-10-30 | 2019-04-05 | 安徽省东乾食品有限公司 | A kind of Dehydrated Vegetable Processing vegetable cutter |
| CN113477502B (en) * | 2021-05-18 | 2022-11-22 | 江苏隆嘉新型建材有限公司 | Grit sieving mechanism for building engineering |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2396954A (en) * | 1943-09-13 | 1946-03-19 | Oliver Iron Mining Company | Vibrating bar grizzly |
| US2690840A (en) * | 1952-10-04 | 1954-10-05 | George C Kohlmier | Rock thrower |
| US3402816A (en) * | 1965-07-22 | 1968-09-24 | Machinery Inc | Portable gravel handling apparatus |
| DE1245691B (en) * | 1965-10-26 | 1967-07-27 | Hugo Hildebrand Andersson | Arrangement to facilitate sieving |
-
1979
- 1979-07-09 NO NO792278A patent/NO144129C/en unknown
-
1980
- 1980-07-07 FI FI802161A patent/FI70381C/en not_active IP Right Cessation
- 1980-07-08 BR BR8008741A patent/BR8008741A/en unknown
- 1980-07-08 BE BE0/201328A patent/BE884218A/en not_active IP Right Cessation
- 1980-07-08 DE DE8080901176T patent/DE3065519D1/en not_active Expired
- 1980-07-08 JP JP55501443A patent/JPS6128387B2/ja not_active Expired
- 1980-07-08 WO PCT/NO1980/000023 patent/WO1981000066A1/en active IP Right Grant
- 1980-07-09 CA CA000355806A patent/CA1144111A/en not_active Expired
-
1981
- 1981-01-26 EP EP80901176A patent/EP0031820B1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6712218B2 (en) | 2002-07-31 | 2004-03-30 | Klaas Nierop | Soil screener |
Also Published As
| Publication number | Publication date |
|---|---|
| NO144129C (en) | 1981-07-01 |
| FI70381C (en) | 1986-09-19 |
| JPS6128387B2 (en) | 1986-06-30 |
| BE884218A (en) | 1980-11-03 |
| WO1981000066A1 (en) | 1981-01-22 |
| FI802161A (en) | 1981-01-10 |
| DE3065519D1 (en) | 1983-12-15 |
| NO792278L (en) | 1981-01-12 |
| EP0031820A1 (en) | 1981-07-15 |
| EP0031820B1 (en) | 1983-11-09 |
| NO144129B (en) | 1981-03-23 |
| BR8008741A (en) | 1981-04-28 |
| FI70381B (en) | 1986-03-27 |
| JPS56500998A (en) | 1981-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |