CA1294762C - Method and slipforming extruder for casting concrete slabs - Google Patents
Method and slipforming extruder for casting concrete slabsInfo
- Publication number
- CA1294762C CA1294762C CA000532988A CA532988A CA1294762C CA 1294762 C CA1294762 C CA 1294762C CA 000532988 A CA000532988 A CA 000532988A CA 532988 A CA532988 A CA 532988A CA 1294762 C CA1294762 C CA 1294762C
- Authority
- CA
- Canada
- Prior art keywords
- concrete
- mold walls
- concrete mix
- mix
- auger
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
- B28B1/084—Producing shaped prefabricated articles from the material by vibrating or jolting the vibrating moulds or cores being moved horizontally for making strands of moulded articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/29—Producing shaped prefabricated articles from the material by profiling or strickling the material in open moulds or on moulding surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/22—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded by screw or worm
- B28B3/228—Slipform casting extruder, e.g. self-propelled extruder
Abstract
METHOD AND SLIPFORMING EXTRUDER FOR CASTING CONCRETE SLABS
ABSTRACT OF THE DISCLOSURE
A method and an apparatus for casting concrete elements from a concrete mix by means of slipform molding.
According to the method, the concrete mix is extruded onto a bed. Pressure is generated into the concrete mix by means of a first set of exruder members and by compacting the concrete by moving at least one of the movable mold walls in a direction approximately parallel to its plane. The concrete mix is tamped into a more compacted form by means of splines, formed onto at least one of movable mold walls and protruding into the mix. The method and the apparatus in accordance with the invention achieves a high degree of compaction in the concrete mix by means of an uncomplicated apparatus without generating loud noise.
ABSTRACT OF THE DISCLOSURE
A method and an apparatus for casting concrete elements from a concrete mix by means of slipform molding.
According to the method, the concrete mix is extruded onto a bed. Pressure is generated into the concrete mix by means of a first set of exruder members and by compacting the concrete by moving at least one of the movable mold walls in a direction approximately parallel to its plane. The concrete mix is tamped into a more compacted form by means of splines, formed onto at least one of movable mold walls and protruding into the mix. The method and the apparatus in accordance with the invention achieves a high degree of compaction in the concrete mix by means of an uncomplicated apparatus without generating loud noise.
Description
~2~47~i2 The present invention relates to a method and apparatus for slipforming concrete elements.
The invention can be easily adapted to the rnanufacture of different kinds of concrete slabs. The invention is especially applicable to the fabrication of hollow-core concrete elements.
Finnish patent publications 64072 and 64073 describe a so-called shear compaction method for compacting a stiff mix during the casting operation of concrete slabs. These disclosures of the method achieve compaction by means of contra-directional parallel shear displacements in the different zones of the mix within the mold by movlng two opposite walls of the mold in a reciprocating, synchronized manner, with the walls moving mutually in the same direction.
Vibration is also used for compaction of the mix during molding by slipforming.
The method described in the aforementioned patent publications requires a complicated drive system because the angle of the mold walls relative to the vertical plane changes during compaction, while the shape of the mold is subjected to a continuous periodic state of change.
Furthermore, the use of vibration as a method of compaction is a noisy method which in effect wears down the equipment.
The present invention aims to overcome the disadvantages found in prior-art constructions and to present a completely new type of method and apparatus for the fabrication of concrete slabs.
~, .. ..
~Z9~76;~:
According to a broad aspec-t of the present invention there is provided an apparatus for the manufacture of concrete elements by a slipforming molding method. The apparatus comprises at least one auger for initial compaction of a concrete mix.
First drive and power transmission means is provided for driving the at least one auger. Feeding means is provided for supplying the concrete mix onto the at least one auger. At least two opposed mold walls are provided and have protrusions extending from a side which faces the concrete mix. Second drive and power transmission means are provided for reciprocating in a counterphased manner each of the at least two opposed mold walls having the protrusions.
According to a still further broad aspect of the present invention there is provided the method of slipform molding concrete elements from a concrete mix. The method comprises the steps of feeding the concrete mix to an auger of a slipforming apparatus for initial compaction of the concrete mix between two opposed mold walls. The mold walls have protrusions extending from a side which faces the auger. The auger is driven hy drive means and power transmission means.
The opposed mold walls are reciprocateed in a counterphase manner to compact the concrete mix. The reciprocation is imparted by second drive means and power transmission means.
The slipforming apparatus is moved over a surface on which the concrete elements are deposited.
The invention provides remarkable benefits. Thus, the method in accordance with the invention achieves, for instance, a high degree of compaction of a concrete mix by means of an uncomplicated apparatus without generating loud noise.
In the following, the invention will be examined in more detail by means of exemplifying embodiments.
lZ5~47~
Figure l shows a longitudinal cross section of a slipforming extruder for hoLlow-core concrete slabs in accordance with the invention.
Figure ~ shows a cross section of another embodiment of a slipforming extruder for hollow-core slabs in accordance with the invention, especially illustrating the implementation of the transverse movement of compaction in relation to tne molded mix.
.
Figure 3 shows a cross section of two different alternatives of profiles in accordance with the invention for the trowel plate.
Figure ~ shows a longitudinal cross section of a slipforming extruder for the fabrication of massive concrete slabs.
Figure 5 shows a longitudinal cross section of a tl~ird embodi-ment of a slipforming extruder for hollow-core concrete slabs in accordance with the invention, especially illustrating the shape of the trowel plate.
Figure 6 shows in a partially cross-sectional top view a fourth embodiment of a slipforming extruder in accordance with the invention with the side molds movable.
Figure 7 shows cross-sectional views of concrete slabs which are capable of being manufactured by means of an apparatus in accordance with the invention.
Figure 1 illustrates a slipforming molding apparatus in accord-ance with the invention, operating according to an auger flight extruder principle with the concrete mix fed from a hopper 1 by means of an auger 8. The auger is followed by a core-forming mandrel 4 for s'naping the core into a desired form. The core-forming mandrel 4 is followed by a trowel tube 3 for the pur-pose of preventing the mix from collapsing during the final phase of the slipforming process. The apparatus ~oves on ~. .
~ILZ~76Z
a bed 2 supported by wheels 13. The actual compaction is obtained by moving reciprocatingly in the flow direction of the extruder, parallel to the slab surface, a trowel plate 6 and a mix guide plate 7, both of which are provided with splines 2l protruding into the cast mix. The protruding sp-lines 21 are wide in the crosswise direction, probably extend-ing over the entire width of the plate. Hence, in the vicini-ty of the mold surface, the concrete mix tends to conform to the movement trajectory of the surface, whereby the concrete mix is internally sheared, resulting in a simultaneous compac-tion under the prevailing pressure. The synchronized recipro-cating movement is provided by an auxiliary mechanism 9, in which an eccentric, driven by a motor lO, moves the trowel plate 6 and the mix guide plate 7 in a reciprocating, synchro-nized manner. The trowel plate 6 is followed by a stationary trowel plate 5 which finally shapes the slab surface into the desired form. Additionally, the apparatus comprises side mold walls 14.
The compaction process of concrete mix can also be adapted in accordance with Figure 2 so that the trowel plate 6 and the mix guide plate 7 are moved in a reciprocating, synchro-nized manner in opposite directions, crosswise to the molding flow direction, and parallel to the plate, by means of the eccentric 9. The compaction process of the concrete mix is most efficient when a combination of trajectories, as shown in Figures 1 and 2, is used. Figure 3 illustrates in a longitu-dinal cross section the trowel plate 6 and the mix guide plate 7 used in the hollow-core slab extruder shown in Figure 2.
Compaction in the crosswise direction to the molding flow direction requires splines 22, shown in Figure 2, to have the acute and narrow part extending to the mix in the crosswise direction.
`
Extruding a massive slab by means of the slipforming method can be implemented in accordance with Figure 4, whereby the extrusion pressure is generated by means of an auger. The actual compaction process is accomplished in a corresponding , i .
~2947~
fashion by moving the trowel plate 6 and the mix guide plate 7 in opposite directions in a reciprocating, synchronized manner by means of the eccentric 9, whereby, in accordance with the invention, both the mix guide plate 7 and the trowel plate 6 are provided with splines 21 protruding into the mlx for the improvement of compaction and tamping. In the fabrication of a massive slab, the movement of the mold walls crosswise to the mold flow direction as shown in Figure 2 also improves the compaction of the concrete mix.
In the embodiment shown in Figure 5, the trowel plate 19 moves reciprocatingly. ~hen moving in the direction of the arrow, augmented by its protruding spline 21, the plate l9 feeds the mix in the direction of the movement with a simultaneous compacting action.
Figure 6 shows an adaptation of the invention to the movement of the side walls. Here, the side walls 20 are reciprocatingl~
moving, and, when moving in the direction of the arrow, the wall 20 feeds the mix by the aid of its spline 21, simultane-ously compacting the concrete in accordance with the inven-tion. This embodiment is applicable in, for instance, the manufacture of hollow-core slabs, massive slabs, beams, and the like concrete products with the different cross sections shown in Figure 7.
The frequency of the reciprocating movement varies in the range of 20...1000 reciprocatory cycles per minute, preferably at about 300 cycles/min. The length of the reciprocating movement of the mold walls varies in the range of 0.5...50 mm, and is preferably about 10 mm.
;
The splines 21, 22 of the compacting surfaces are preferably adapted to have the maximum protrusion of the splines in the vicinity of the hopper 1 and then steadily diminishing towards the final end of the slipforming extruder, whereby the finished product will be free of impressions from the splines.
The invention can be easily adapted to the rnanufacture of different kinds of concrete slabs. The invention is especially applicable to the fabrication of hollow-core concrete elements.
Finnish patent publications 64072 and 64073 describe a so-called shear compaction method for compacting a stiff mix during the casting operation of concrete slabs. These disclosures of the method achieve compaction by means of contra-directional parallel shear displacements in the different zones of the mix within the mold by movlng two opposite walls of the mold in a reciprocating, synchronized manner, with the walls moving mutually in the same direction.
Vibration is also used for compaction of the mix during molding by slipforming.
The method described in the aforementioned patent publications requires a complicated drive system because the angle of the mold walls relative to the vertical plane changes during compaction, while the shape of the mold is subjected to a continuous periodic state of change.
Furthermore, the use of vibration as a method of compaction is a noisy method which in effect wears down the equipment.
The present invention aims to overcome the disadvantages found in prior-art constructions and to present a completely new type of method and apparatus for the fabrication of concrete slabs.
~, .. ..
~Z9~76;~:
According to a broad aspec-t of the present invention there is provided an apparatus for the manufacture of concrete elements by a slipforming molding method. The apparatus comprises at least one auger for initial compaction of a concrete mix.
First drive and power transmission means is provided for driving the at least one auger. Feeding means is provided for supplying the concrete mix onto the at least one auger. At least two opposed mold walls are provided and have protrusions extending from a side which faces the concrete mix. Second drive and power transmission means are provided for reciprocating in a counterphased manner each of the at least two opposed mold walls having the protrusions.
According to a still further broad aspect of the present invention there is provided the method of slipform molding concrete elements from a concrete mix. The method comprises the steps of feeding the concrete mix to an auger of a slipforming apparatus for initial compaction of the concrete mix between two opposed mold walls. The mold walls have protrusions extending from a side which faces the auger. The auger is driven hy drive means and power transmission means.
The opposed mold walls are reciprocateed in a counterphase manner to compact the concrete mix. The reciprocation is imparted by second drive means and power transmission means.
The slipforming apparatus is moved over a surface on which the concrete elements are deposited.
The invention provides remarkable benefits. Thus, the method in accordance with the invention achieves, for instance, a high degree of compaction of a concrete mix by means of an uncomplicated apparatus without generating loud noise.
In the following, the invention will be examined in more detail by means of exemplifying embodiments.
lZ5~47~
Figure l shows a longitudinal cross section of a slipforming extruder for hoLlow-core concrete slabs in accordance with the invention.
Figure ~ shows a cross section of another embodiment of a slipforming extruder for hollow-core slabs in accordance with the invention, especially illustrating the implementation of the transverse movement of compaction in relation to tne molded mix.
.
Figure 3 shows a cross section of two different alternatives of profiles in accordance with the invention for the trowel plate.
Figure ~ shows a longitudinal cross section of a slipforming extruder for the fabrication of massive concrete slabs.
Figure 5 shows a longitudinal cross section of a tl~ird embodi-ment of a slipforming extruder for hollow-core concrete slabs in accordance with the invention, especially illustrating the shape of the trowel plate.
Figure 6 shows in a partially cross-sectional top view a fourth embodiment of a slipforming extruder in accordance with the invention with the side molds movable.
Figure 7 shows cross-sectional views of concrete slabs which are capable of being manufactured by means of an apparatus in accordance with the invention.
Figure 1 illustrates a slipforming molding apparatus in accord-ance with the invention, operating according to an auger flight extruder principle with the concrete mix fed from a hopper 1 by means of an auger 8. The auger is followed by a core-forming mandrel 4 for s'naping the core into a desired form. The core-forming mandrel 4 is followed by a trowel tube 3 for the pur-pose of preventing the mix from collapsing during the final phase of the slipforming process. The apparatus ~oves on ~. .
~ILZ~76Z
a bed 2 supported by wheels 13. The actual compaction is obtained by moving reciprocatingly in the flow direction of the extruder, parallel to the slab surface, a trowel plate 6 and a mix guide plate 7, both of which are provided with splines 2l protruding into the cast mix. The protruding sp-lines 21 are wide in the crosswise direction, probably extend-ing over the entire width of the plate. Hence, in the vicini-ty of the mold surface, the concrete mix tends to conform to the movement trajectory of the surface, whereby the concrete mix is internally sheared, resulting in a simultaneous compac-tion under the prevailing pressure. The synchronized recipro-cating movement is provided by an auxiliary mechanism 9, in which an eccentric, driven by a motor lO, moves the trowel plate 6 and the mix guide plate 7 in a reciprocating, synchro-nized manner. The trowel plate 6 is followed by a stationary trowel plate 5 which finally shapes the slab surface into the desired form. Additionally, the apparatus comprises side mold walls 14.
The compaction process of concrete mix can also be adapted in accordance with Figure 2 so that the trowel plate 6 and the mix guide plate 7 are moved in a reciprocating, synchro-nized manner in opposite directions, crosswise to the molding flow direction, and parallel to the plate, by means of the eccentric 9. The compaction process of the concrete mix is most efficient when a combination of trajectories, as shown in Figures 1 and 2, is used. Figure 3 illustrates in a longitu-dinal cross section the trowel plate 6 and the mix guide plate 7 used in the hollow-core slab extruder shown in Figure 2.
Compaction in the crosswise direction to the molding flow direction requires splines 22, shown in Figure 2, to have the acute and narrow part extending to the mix in the crosswise direction.
`
Extruding a massive slab by means of the slipforming method can be implemented in accordance with Figure 4, whereby the extrusion pressure is generated by means of an auger. The actual compaction process is accomplished in a corresponding , i .
~2947~
fashion by moving the trowel plate 6 and the mix guide plate 7 in opposite directions in a reciprocating, synchronized manner by means of the eccentric 9, whereby, in accordance with the invention, both the mix guide plate 7 and the trowel plate 6 are provided with splines 21 protruding into the mlx for the improvement of compaction and tamping. In the fabrication of a massive slab, the movement of the mold walls crosswise to the mold flow direction as shown in Figure 2 also improves the compaction of the concrete mix.
In the embodiment shown in Figure 5, the trowel plate 19 moves reciprocatingly. ~hen moving in the direction of the arrow, augmented by its protruding spline 21, the plate l9 feeds the mix in the direction of the movement with a simultaneous compacting action.
Figure 6 shows an adaptation of the invention to the movement of the side walls. Here, the side walls 20 are reciprocatingl~
moving, and, when moving in the direction of the arrow, the wall 20 feeds the mix by the aid of its spline 21, simultane-ously compacting the concrete in accordance with the inven-tion. This embodiment is applicable in, for instance, the manufacture of hollow-core slabs, massive slabs, beams, and the like concrete products with the different cross sections shown in Figure 7.
The frequency of the reciprocating movement varies in the range of 20...1000 reciprocatory cycles per minute, preferably at about 300 cycles/min. The length of the reciprocating movement of the mold walls varies in the range of 0.5...50 mm, and is preferably about 10 mm.
;
The splines 21, 22 of the compacting surfaces are preferably adapted to have the maximum protrusion of the splines in the vicinity of the hopper 1 and then steadily diminishing towards the final end of the slipforming extruder, whereby the finished product will be free of impressions from the splines.
Claims (7)
1. An apparatus for the manufacture of concrete elements by a slipforming molding method, said apparatus comprising:
at least one auger for initial compaction of a concrete mix:
first drive and power transmission means for driving the at least one auger;
feeding means for supplying the concrete mix onto the at least one auger;
at least two opposed mold walls having protrusions extending from a side which faces the concrete mix; and second drive and power transmission means for reciprocating in a counterphased manner each of the at least two opposed mold walls having the protrusions.
at least one auger for initial compaction of a concrete mix:
first drive and power transmission means for driving the at least one auger;
feeding means for supplying the concrete mix onto the at least one auger;
at least two opposed mold walls having protrusions extending from a side which faces the concrete mix; and second drive and power transmission means for reciprocating in a counterphased manner each of the at least two opposed mold walls having the protrusions.
2. The apparatus as claimed in claim 1 wherein the protrusions of the at least two opposed walls have the largest extensions at an end of the mold closest to the feeding means and diminishing in a direction away from the feeding means.
3. The apparatus as claimed in claim 1 wherein the at least two opposed mold walls are located in a generally horizontal plane.
4. The apparatus as claimed in claim 1 wherein the at least two opposed mold walls are located in a generally vertical plane.
5. The apparatus as claimed in claim 1 wherein the at least two opposed mold walls are located in both a generally horizontal and a generally vertical plane.
6. The apparatus as claimed in claim 1 wherein the at least two opposed mold walls are movable in a direction generally perpendicular to a flow direction of a slipforming extruder.
7. A method of slipform molding concrete elements from a concrete mix, said method comprising the steps of:
(i) feeding said concrete mix to an auger of a slipforming apparatus for initial compaction of said concrete mix between two opposed mold walls, said mold walls having protrusions extending from a side which faces said auger;
(ii) driving said auger by drive means and power transmission means;
(iii) reciprocating said opposed mold walls in a counterphase manner to compact said concrete mix, said reciprocation being imparted by second drive means and power transmission means; and (iv) moving said slipforming apparatus over a surface on which said concrete elements are deposited.
(i) feeding said concrete mix to an auger of a slipforming apparatus for initial compaction of said concrete mix between two opposed mold walls, said mold walls having protrusions extending from a side which faces said auger;
(ii) driving said auger by drive means and power transmission means;
(iii) reciprocating said opposed mold walls in a counterphase manner to compact said concrete mix, said reciprocation being imparted by second drive means and power transmission means; and (iv) moving said slipforming apparatus over a surface on which said concrete elements are deposited.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI861471A FI76514C (en) | 1986-04-07 | 1986-04-07 | Method and apparatus for casting concrete elements |
| FI861471 | 1986-04-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1294762C true CA1294762C (en) | 1992-01-28 |
Family
ID=8522420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000532988A Expired - Fee Related CA1294762C (en) | 1986-04-07 | 1987-03-25 | Method and slipforming extruder for casting concrete slabs |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4773838A (en) |
| EP (1) | EP0241172B1 (en) |
| AT (1) | ATE63081T1 (en) |
| CA (1) | CA1294762C (en) |
| DE (1) | DE3769689D1 (en) |
| DK (1) | DK174187A (en) |
| FI (1) | FI76514C (en) |
| NO (1) | NO871440L (en) |
| SU (1) | SU1711660A3 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI83986C (en) * | 1987-06-18 | 1991-09-25 | Parma Oy | GLIDGJUTMASKIN FOER FRAMSTAELLNING AV LAONGSTRAECKTA BETONGSTYCKEN. |
| JPH08403B2 (en) * | 1991-12-17 | 1996-01-10 | 茂 小林 | Method and device for manufacturing concrete panel by continuous rolling |
| FI110174B (en) * | 1994-04-07 | 2002-12-13 | Valkeakoski Extec Oy Ltd | A device for producing a concrete product |
| FR2735415B1 (en) * | 1995-06-15 | 1997-07-18 | Mci Sa | METHOD FOR MANUFACTURING A PLATE-SHAPED ARTICLE AND ARTICLE MANUFACTURED |
| FI109284B (en) * | 1996-12-04 | 2002-06-28 | Partek Concrete Dev Oy Ab | Method and equipment for casting concrete products |
| US6131350A (en) * | 1998-09-03 | 2000-10-17 | Sanders; Mark E. | Building foundation using pre-cast concrete elements |
| FI19991792A (en) * | 1999-08-23 | 2001-02-24 | Valkeakoski Extec Oy Ltd | Method and arrangement for making a concrete product and a series of concrete products |
| FI113850B (en) * | 2002-01-30 | 2004-06-30 | Consolis Technology Oy Ab | Method and apparatus for casting concrete products |
| FI115760B (en) * | 2002-04-08 | 2005-07-15 | Consolis Technology Oy Ab | Process for casting a concrete product |
| FI20021561A (en) * | 2002-09-02 | 2004-03-03 | Consolis Technology Oy Ab | Method and apparatus for casting a concrete product |
| FI114623B (en) | 2002-09-16 | 2004-11-30 | Consolis Technology Oy Ab | Method and equipment for casting a concrete product |
| FI20031534A (en) * | 2003-10-20 | 2005-04-21 | Consolis Technology Oy Ab | Method and apparatus for casting concrete elements |
| FI125864B (en) | 2009-09-02 | 2016-03-15 | Pamplona Holding 1 Oy | Apparatus and procedure for casting concrete products |
| CN112643852B (en) * | 2020-12-18 | 2022-02-08 | 张家界远大住宅工业有限公司 | Casting molding method for precast concrete PC (polycarbonate) component |
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| US214374A (en) * | 1879-04-15 | Improvement in dough-kneaders | ||
| US850428A (en) * | 1907-01-21 | 1907-04-16 | Columbus Clay Products Company | Device for making ornamental brick. |
| US1160307A (en) * | 1914-12-07 | 1915-11-16 | Decatur Brick Mfg Company | Brick-machine. |
| US1559682A (en) * | 1925-05-06 | 1925-11-03 | Western Brick Company | Machine for producing brick faces |
| US1787219A (en) * | 1927-04-21 | 1930-12-30 | United States Gypsum Co | Method of and apparatus for scoring blocks |
| US2031899A (en) * | 1934-09-17 | 1936-02-25 | Decatur Brick Mfg Company | Indenting and suamping machine for clay products, such as paving brick and the like |
| US2583600A (en) * | 1948-09-23 | 1952-01-29 | Hazle V Schreiber | Feed grinding and die expressing machine |
| US2582645A (en) * | 1949-03-09 | 1952-01-15 | Bowerston Shale Company | Tile perforating machine |
| US3044391A (en) * | 1959-05-15 | 1962-07-17 | Sperry Rand Corp | Harvester |
| CH477964A (en) * | 1968-01-23 | 1969-09-15 | Beam British Engineering Appli | Mobile maschine for the continuous production of concrete joists |
| GB1387826A (en) * | 1971-07-02 | 1975-03-19 | Spiroll Corp Ltd | Device for forming shear keyways on sides of extruded slabs and the like |
| US3972666A (en) * | 1974-12-09 | 1976-08-03 | Kolmar Laboratories, Inc. | Apparatus for extruding dry powdered materials |
| US3904341A (en) * | 1975-08-29 | 1975-09-09 | Dyform Concrete Prestressed Lt | Machine for extruding cement-like material into articles |
| GB1550154A (en) * | 1976-07-09 | 1979-08-08 | Spiroll Corp Ltd | Devices for forming shear keyways in extruded slabs of concrete material |
| US4133619A (en) * | 1976-09-10 | 1979-01-09 | The Flexicore Co., Inc. | Extrusion casting apparatus |
| FI67320C (en) * | 1983-05-09 | 1985-03-11 | Partek Ab | GLOBAL REQUIREMENTS FOR THE CONDUCT OF CONCRETE |
| FI70821C (en) * | 1983-05-09 | 1986-10-27 | Partek Ab | FOER FAR SHEET FOR GLID GUTTING MACHINE AV HAOLPLATTOR AVETONG |
| FI73170C (en) * | 1984-04-24 | 1990-02-16 | Partek Ab | FARING EQUIPMENT FOR THE PRODUCTION OF CONCRETE PRODUCTS. |
| DE3585007D1 (en) * | 1984-08-24 | 1992-02-06 | Lohja Parma Eng Lpe | METHOD AND DEVICE FOR PRODUCING HOLLOW PANELS AND OTHER BUILDING ELEMENTS, preferably FROM CONCRETE. |
| FI843544A0 (en) * | 1984-09-10 | 1984-09-10 | Rakennusvalmiste Oy | GLIDGJUTMASKIN FOER FRAMSTAELLNING AV BETONGELEMENT. |
| FI843545L (en) * | 1984-09-10 | 1986-03-11 | Rakennusvalmiste Oy | ENLIGT STUVNINGSPRINCIPEN FUNGERANDE GLIDGJUTMASKIN. |
| FI844686L (en) * | 1984-11-29 | 1986-05-30 | Rakennusvalmiste Oy | FOERFARANDE FOER KOMPRIMERING AV BETONG. |
| FI850837A0 (en) * | 1985-03-01 | 1985-03-01 | Kt Suunnittelu Oy | GLIDGJUTMASKIN FOER FRAMSTAELLNING AV BETONGELEMENT. |
-
1986
- 1986-04-07 FI FI861471A patent/FI76514C/en not_active IP Right Cessation
-
1987
- 1987-03-20 DE DE8787302415T patent/DE3769689D1/en not_active Expired - Fee Related
- 1987-03-20 AT AT87302415T patent/ATE63081T1/en active
- 1987-03-20 EP EP87302415A patent/EP0241172B1/en not_active Expired - Lifetime
- 1987-03-25 CA CA000532988A patent/CA1294762C/en not_active Expired - Fee Related
- 1987-04-01 US US07/032,619 patent/US4773838A/en not_active Expired - Fee Related
- 1987-04-06 DK DK174187A patent/DK174187A/en active IP Right Grant
- 1987-04-06 SU SU874202305A patent/SU1711660A3/en active
- 1987-04-06 NO NO871440A patent/NO871440L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DK174187A (en) | 1987-10-08 |
| US4773838A (en) | 1988-09-27 |
| DK174187D0 (en) | 1987-04-06 |
| EP0241172A2 (en) | 1987-10-14 |
| NO871440D0 (en) | 1987-04-06 |
| ATE63081T1 (en) | 1991-05-15 |
| NO871440L (en) | 1987-10-08 |
| FI861471A0 (en) | 1986-04-07 |
| EP0241172B1 (en) | 1991-05-02 |
| FI861471A (en) | 1987-10-08 |
| DE3769689D1 (en) | 1991-06-06 |
| EP0241172A3 (en) | 1988-04-27 |
| SU1711660A3 (en) | 1992-02-07 |
| FI76514B (en) | 1988-07-29 |
| FI76514C (en) | 1989-07-31 |
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