EP0047041A2 - Device for picking up elements, for example, of a pavement - Google Patents

Device for picking up elements, for example, of a pavement Download PDF

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Publication number
EP0047041A2
EP0047041A2 EP81200950A EP81200950A EP0047041A2 EP 0047041 A2 EP0047041 A2 EP 0047041A2 EP 81200950 A EP81200950 A EP 81200950A EP 81200950 A EP81200950 A EP 81200950A EP 0047041 A2 EP0047041 A2 EP 0047041A2
Authority
EP
European Patent Office
Prior art keywords
scooping member
flap
rotary shaft
scooping
stones
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.)
Withdrawn
Application number
EP81200950A
Other languages
German (de)
French (fr)
Other versions
EP0047041A3 (en
Inventor
Hendrik Pleyzier
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.)
Pleyzier Gerry
Van Dalfsen Rudolf Hendrik
Original Assignee
Pleyzier Gerry
Van Dalfsen Rudolf Hendrik
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 Pleyzier Gerry, Van Dalfsen Rudolf Hendrik filed Critical Pleyzier Gerry
Publication of EP0047041A2 publication Critical patent/EP0047041A2/en
Publication of EP0047041A3 publication Critical patent/EP0047041A3/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/185—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools for brick cleaning
    • 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
    • B07B1/18—Drum screens
    • B07B1/22—Revolving drums
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/001—Cleaning bricks
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/12—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor
    • E01C23/121—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for taking-up, tearing-up, or full-depth breaking-up paving, e.g. sett extractor with non-powered tools, e.g. rippers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/40—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets
    • E02F3/407—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with ejecting or other unloading device
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F7/00—Equipment for conveying or separating excavated material
    • E02F7/06—Delivery chutes or screening plants or mixing plants mounted on dredgers or excavators

Definitions

  • the invention relates to a device for picking up elements located in one plane on the ground, for example, of a pavement comprising a fork-like scooping member, means for moving the scoop in a substantially vertical direction, . swinging means for turning the scoop about a horizontal axis and menas for attachment to a vehicle, for example, a tractor.
  • Such a known device is employed for picking up paving stones.
  • the device is driven to a collecting site where the scoop is emptied. After the stones are cleaned and, if necessary, the ground is heightened, the stones are reused for the pavement.
  • One method consists in manually picking up the stones deposited on the storage site and placing them in a vibratory or scraping device. In this vibratory or scraping device the stones are cleaned. Picking up the stones from the storage site and depositing them in the vibratory or scraping device is a hard and monotonous job.
  • a further method of removing earth or sand sticking to the stones consists in transiently actuating the control-members of the device so that by vibrating and shaking the earth or sand is removed. This method is detrimental to the bearings and the seal of the hydraulically actuated members.
  • the invention has for its object to provide a device in which after the paving is picked up the stones can be cleaned in a single run.
  • the stones picked up from a range of pavement are cleaned by causing the device to rotate after the flap is closed.
  • the stones will tumble along and scrape one another and the loosened earth will be deposited on the site of use. Subsequently the cleaned stones can be deposited on a temporary storage site by opening the flap and by turning the scooping member.
  • the fork-like scooping member preferably has a substantially semi-cylindrical shape and the flap preferably is the complement thereof.
  • the flap is pivotable about a shaft arranges on the cylindrical wall of the scooping member by means of an actuating plunger arranged between the flap and the scooping member.
  • a shap lock is provided.
  • the inner side of the flap and the scooping member may be lined with sieving material the mesh size of which can be chosen at will.
  • Precautions are required',for establishing a connection between the hydraulic control-ram rotating together with the flap and the scooping member and a stationary hydraulic pressure source.
  • the hydraulic pressure source communicates through ducts with channels in a hub of the rotary shaft opening out in annular grooves in the rotary shaft of the scooping member and through ducts of the plunger- with channels in the rotary shaft opening out in the grooves of the rotary shaft.
  • a fastening plate 7 is pivotally arranged with the aid of fastening beams 2 and 3 via arms 5 and 6 on a vehicle, for example, a tractor 1.
  • the fastening plate 7 is coupled with a plunger 37 in a manner such that the fastening plate 7 can rotate about a shaft 8.
  • To the fastening plate 7 is secured the fork-like scooping member 9.
  • the scooping member has a substantially semi-cylindrical shape and holds at one end a pivotal shaft 10 for a flap 11, the shape of which is complementary to the scooping member 9.
  • the flap can be caused to swing by means of the plunger 12.
  • the flap can swing between an open position (fig. 1) and a closed position (fig.3). In the closed state the scooping member 9.
  • a snap latch 36 which is movable between two spring-loaded locking members 13 and 14 arranged side by side.
  • the paving produces a rotary effort on the scooping member 9.
  • a stop 17 is provided on the fastening plate 19, at which a substantially channel-section beam 18 of the scooping member 9 is blocked.
  • the plunger 12 is connected with a hydraulic pressure source provided on the tractor by means of the construction shown in fig. 6. With a stationary hub 20 are connected ducts 21 and 22 for establishing a connection with the source.
  • the rotary shaft of the scooping member 9 and of the flap 11 is rotatably journalled in the bearing 24 of the hub.
  • the rotary shaft 23 has two peripheral grooves 25 and 26 communicating with the ducts 21 and 22 and with longitudinal channels 27 and 28 in the rotary shaft. With the channels 27 and 28 communicate connecting ducts 29 and 30 leading the hydraulic medium to the plunger 12.
  • This construction permits of coupling the simultaneously rotating plunger 12 with the hydraulic pressure source.
  • a hydraulic motor 31 is provided, which drives the rotary shaft 23 through a gear wheel transmission box 32.
  • the device operates as follows:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Road Repair (AREA)
  • Road Paving Machines (AREA)
  • Shovels (AREA)
  • Cleaning Of Streets, Tracks, Or Beaches (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The invention relates to a device for picking up elements located in one plane on the ground, for example, of a pavement, comprising a fork-like scooping member, means for moving the scooping member in a substantially vertical direction, means for swing the scooping member about a horizontal axis and means for attachment to a vehicle, for example, a tractor.
The device according to the invention is characterized by a flap which is movable between a position in which the scooping member is closed and a position in which the scooping member is accessible, by control-means for moving the flap and by designing the swinging means so as to be capable of rotating the scooping member and the flap.

Description

  • The invention relates to a device for picking up elements located in one plane on the ground, for example, of a pavement comprising a fork-like scooping member, means for moving the scoop in a substantially vertical direction, . swinging means for turning the scoop about a horizontal axis and menas for attachment to a vehicle, for example, a tractor.
  • Such a known device is employed for picking up paving stones. When the stones are picked up, the device is driven to a collecting site where the scoop is emptied. After the stones are cleaned and, if necessary, the ground is heightened, the stones are reused for the pavement.
  • Cleaning of the stones if performed in different ways. One method consists in manually picking up the stones deposited on the storage site and placing them in a vibratory or scraping device. In this vibratory or scraping device the stones are cleaned. Picking up the stones from the storage site and depositing them in the vibratory or scraping device is a hard and monotonous job. A further method of removing earth or sand sticking to the stones consists in transiently actuating the control-members of the device so that by vibrating and shaking the earth or sand is removed. This method is detrimental to the bearings and the seal of the hydraulically actuated members.
  • The invention has for its object to provide a device in which after the paving is picked up the stones can be cleaned in a single run.
  • This is achieved by means of a flap adapted to move between a position in which the scoop is closed and a position in which the scoop is accessible, by means of control-members for moving the flap and by designing the swinging means so as to be able to rotate the scoop and the flap.
  • In this way the stones picked up from a range of pavement are cleaned by causing the device to rotate after the flap is closed. The stones will tumble along and scrape one another and the loosened earth will be deposited on the site of use. Subsequently the cleaned stones can be deposited on a temporary storage site by opening the flap and by turning the scooping member.
  • The fork-like scooping member preferably has a substantially semi-cylindrical shape and the flap preferably is the complement thereof. The flap is pivotable about a shaft arranges on the cylindrical wall of the scooping member by means of an actuating plunger arranged between the flap and the scooping member.
  • In order to ensure that during the rotation the flap and the scooping member will be relatively locked in place, a shap lock is provided. The inner side of the flap and the scooping member may be lined with sieving material the mesh size of which can be chosen at will.
  • Precautions are required',for establishing a connection between the hydraulic control-ram rotating together with the flap and the scooping member and a stationary hydraulic pressure source. To this end the hydraulic pressure source communicates through ducts with channels in a hub of the rotary shaft opening out in annular grooves in the rotary shaft of the scooping member and through ducts of the plunger- with channels in the rotary shaft opening out in the grooves of the rotary shaft.
  • The invention will be explained with reference to the drawings of one embodiment.
  • The drawings show in:
    • Fig. 1 a perspective view of the device embodying the invention;
    • Fig. 2 a detail of the stop means for blocking the movement of the scooping member opposite the direction of rotation;
    • Fig. 3 a perspective view of the device embodying the invention during the cleaning operation;
    • Fig. 4 a perspective view of the device of Fig. 1 viewed from the opposite side;
    • Fig. 5 a sectional view taken on the line V-V in fig. 1; and
    • Fig. 6 a sectional view taken on the line VI-VI of fig. 5.
  • A fastening plate 7 is pivotally arranged with the aid of fastening beams 2 and 3 via arms 5 and 6 on a vehicle, for example, a tractor 1. The fastening plate 7 is coupled with a plunger 37 in a manner such that the fastening plate 7 can rotate about a shaft 8. To the fastening plate 7 is secured the fork-like scooping member 9. The scooping member has a substantially semi-cylindrical shape and holds at one end a pivotal shaft 10 for a flap 11, the shape of which is complementary to the scooping member 9. The flap can be caused to swing by means of the plunger 12. The flap can swing between an open position (fig. 1) and a closed position (fig.3). In the closed state the scooping member 9. and the flap 11 are locked in place by means of a snap latch 36, which is movable between two spring-loaded locking members 13 and 14 arranged side by side. In the scooping position (fig.l) the paving produces a rotary effort on the scooping member 9. In order to prevent the rotary effort from rotating the scooping member in the direction of the arrow 16 (fig.2), a stop 17 is provided on the fastening plate 19, at which a substantially channel-section beam 18 of the scooping member 9 is blocked.
  • The plunger 12 is connected with a hydraulic pressure source provided on the tractor by means of the construction shown in fig. 6. With a stationary hub 20 are connected ducts 21 and 22 for establishing a connection with the source. The rotary shaft of the scooping member 9 and of the flap 11 is rotatably journalled in the bearing 24 of the hub. The rotary shaft 23 has two peripheral grooves 25 and 26 communicating with the ducts 21 and 22 and with longitudinal channels 27 and 28 in the rotary shaft. With the channels 27 and 28 communicate connecting ducts 29 and 30 leading the hydraulic medium to the plunger 12. This construction permits of coupling the simultaneously rotating plunger 12 with the hydraulic pressure source. In order to rotate the scooping member 9 and the flap 11 a hydraulic motor 31 is provided, which drives the rotary shaft 23 through a gear wheel transmission box 32.
  • The device operates as follows:
    • In the opened position of the device (see fig.l) the pavement is picked up from the ground by the forward movement of the tractor in the direction indicated by the arrow. After an amount of stones is picked up, the flap 11 is moved into its closed position and the cylindrical unit thus formed is vertically moved upwards by actuating the plunger 37 and causing to rotate in the direction of the arrow in fig. 3. During this rotation the stones are cleaned by the scraping effect of the moving stones. The sand drops through the mesh to the ground and the cleaned stones can be brought to a temporary storage site or they may be directly worked up locally. By a selection of the sieve arranged on the inner side of the flap and the scooping member a grading operation may be carried out, for example, for obtaining gravel for use in concrete or on tennis courts and slags for road construction.

Claims (8)

1. A device for picking up elements located in one plane on the ground, for example, of a pavement, comprising a fork-like scooping member, means for moving the scooping member in a substantially vertical direction, means for swing the scooping member about a horizontal axis and means for attachment to a vehicle, for example, a tractor, characterized by a flap which is movable between a position in which the scooping member is closed and a position in which the scooping member is accessible, by control-means for moving the flap and by designing the swinging means so as to be capable of rotating the scooping member and the flap.
2. A device as claimed in claim 1, characterized in that the fork-like scooping member has a substantially semi-cylindrical shape and the flap has a complementary shape.
3. A device as claimed in. claims 1 and 2, characterized in that the flap is pivotable about a shaft arranged on the cylindrical wall of the,scooping member.
4. A device as claimed in claims 1 to 3, characterized in that an actuating plunger is arranged between the flap and the scooping member.
5. A device as claimed in claims 1 to 4, characterized in that in the closed position the scooping member and the flap are locked in position by a snap lock.
6. A device as claimed in claims 1 to 5, characterized in that the inner side of the flap and the scooping member are coated with a sieve.
7. A device as claimed in claims 1 to 6, characterized in that a hydraulic pressure source communicates through ducts with channels in a hub of the rotary shaft opening out in annular grooves of the rotary shaft of the scooping member and in that the plunger is connected through ducts with channels in the rotary shaft communicating with the grooves in the rotary shaft.
8. A device as claimed in claims 1 to 7, characterized by stop means for blocking the movement of te scooping member opposite the direction of rotation.
EP81200950A 1980-08-29 1981-08-26 Device for picking up elements, for example, of a pavement Withdrawn EP0047041A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NLAANVRAGE8004941,A NL174281B (en) 1980-08-29 1980-08-29 DEVICE FOR RECORDING A LAYER OF ELEMENTS WITH A CYLINDRICAL RECORDING DEVICE, OF WHICH A VALVE-PARTED PART RECEIVES THE ELEMENTS.
NL8004941 1980-08-29

Publications (2)

Publication Number Publication Date
EP0047041A2 true EP0047041A2 (en) 1982-03-10
EP0047041A3 EP0047041A3 (en) 1982-08-04

Family

ID=19835804

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81200950A Withdrawn EP0047041A3 (en) 1980-08-29 1981-08-26 Device for picking up elements, for example, of a pavement

Country Status (4)

Country Link
EP (1) EP0047041A3 (en)
JP (1) JPS5774438A (en)
NL (1) NL174281B (en)
ZA (1) ZA815835B (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0106412A1 (en) * 1982-10-14 1984-04-25 Verachtert, Antonius Petrus Device for cleaning products
EP0178656A1 (en) * 1984-10-18 1986-04-23 Prodec Inter Ab Method and apparatus for separating from excavated materials the fine and coarse constituents thereof
EP0256169A1 (en) * 1985-02-14 1988-02-24 T.B. Polak, handelende onder de naam INTERNATIONAL EFFICIENT PRODUCTS A method of re-paving roads paved with paving stones or bricks, and apparatus for the application of the method
DE3811596C1 (en) * 1988-04-07 1989-07-27 Michael Hubertus 4708 Kamen De Richterich Mobile stone-cleaning machine
WO1990012929A1 (en) * 1989-04-21 1990-11-01 Tord Jonsson A device for a sorting shovel
EP0455309A2 (en) * 1990-05-04 1991-11-06 Rudolf Hendrik Van Dalfsen Scooping apparatus, vehicle and coupling plate therefore
WO1992004135A1 (en) * 1990-08-31 1992-03-19 Dagny Carlsson Method and device for screening earth, gravel and the like
DE4123611C1 (en) * 1991-07-17 1992-08-13 De Dissel Beheer B.V., Aalten, Nl
DE4235098A1 (en) * 1992-10-17 1994-04-21 Schmetz Roland Dipl Wirtsch In Device for handling materials e.g. separating potatoes from earth - or mixing feedstuffs, having cylindrical container mounted on tractor with cover which pivots about same axis as container.
US5311684A (en) * 1990-05-04 1994-05-17 Rudolf Van Dalfsen Scooping apparatus, vehicle and coupling plate therefore
WO1995029297A1 (en) * 1994-04-20 1995-11-02 Hellgren, Gunborg, Margit, Linea Improved bucket with screening device
US7591379B2 (en) 2002-05-31 2009-09-22 Sam Dominic Seaton Turnbull Screen/mixer
US20220002967A1 (en) * 2020-07-06 2022-01-06 Thomas Sampson Dirt Screening Bucket Attachment Device
DE102022205180A1 (en) 2022-05-24 2023-11-30 Cobble AG Process and system for the preparation and laying of natural stone paving

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH052657Y2 (en) * 1986-10-07 1993-01-22

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1974717A (en) * 1934-02-19 1934-09-25 Bles Charles Le Rolling dirt mover
US2422985A (en) * 1944-07-04 1947-06-24 Laurence L Reckler Earth handling implement
GB1512206A (en) * 1974-12-21 1978-05-24 Foulger Ltd W Cleaning and loading apparatus for root crops

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5124722U (en) * 1974-08-12 1976-02-23
JPS5410775U (en) * 1977-06-24 1979-01-24

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1974717A (en) * 1934-02-19 1934-09-25 Bles Charles Le Rolling dirt mover
US2422985A (en) * 1944-07-04 1947-06-24 Laurence L Reckler Earth handling implement
GB1512206A (en) * 1974-12-21 1978-05-24 Foulger Ltd W Cleaning and loading apparatus for root crops

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0106412A1 (en) * 1982-10-14 1984-04-25 Verachtert, Antonius Petrus Device for cleaning products
EP0178656A1 (en) * 1984-10-18 1986-04-23 Prodec Inter Ab Method and apparatus for separating from excavated materials the fine and coarse constituents thereof
US4805703A (en) * 1984-10-18 1989-02-21 Prodec Inter Ab Method and apparatus for separating fine and coarse materials from excavated materials
EP0256169A1 (en) * 1985-02-14 1988-02-24 T.B. Polak, handelende onder de naam INTERNATIONAL EFFICIENT PRODUCTS A method of re-paving roads paved with paving stones or bricks, and apparatus for the application of the method
DE3811596C1 (en) * 1988-04-07 1989-07-27 Michael Hubertus 4708 Kamen De Richterich Mobile stone-cleaning machine
WO1990012929A1 (en) * 1989-04-21 1990-11-01 Tord Jonsson A device for a sorting shovel
EP0455309A3 (en) * 1990-05-04 1992-04-15 Rudolf Hendrik Van Dalfsen Scooping apparatus, vehicle and coupling plate therefore
EP0455309A2 (en) * 1990-05-04 1991-11-06 Rudolf Hendrik Van Dalfsen Scooping apparatus, vehicle and coupling plate therefore
US5311684A (en) * 1990-05-04 1994-05-17 Rudolf Van Dalfsen Scooping apparatus, vehicle and coupling plate therefore
WO1992004135A1 (en) * 1990-08-31 1992-03-19 Dagny Carlsson Method and device for screening earth, gravel and the like
DE4123611C1 (en) * 1991-07-17 1992-08-13 De Dissel Beheer B.V., Aalten, Nl
DE4235098A1 (en) * 1992-10-17 1994-04-21 Schmetz Roland Dipl Wirtsch In Device for handling materials e.g. separating potatoes from earth - or mixing feedstuffs, having cylindrical container mounted on tractor with cover which pivots about same axis as container.
WO1995029297A1 (en) * 1994-04-20 1995-11-02 Hellgren, Gunborg, Margit, Linea Improved bucket with screening device
US7591379B2 (en) 2002-05-31 2009-09-22 Sam Dominic Seaton Turnbull Screen/mixer
US20220002967A1 (en) * 2020-07-06 2022-01-06 Thomas Sampson Dirt Screening Bucket Attachment Device
DE102022205180A1 (en) 2022-05-24 2023-11-30 Cobble AG Process and system for the preparation and laying of natural stone paving

Also Published As

Publication number Publication date
NL174281B (en) 1983-12-16
ZA815835B (en) 1982-08-25
JPS5774438A (en) 1982-05-10
JPH0144843B2 (en) 1989-09-29
EP0047041A3 (en) 1982-08-04
NL8004941A (en) 1982-01-04

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Inventor name: PLEYZIER, HENDRIK