WO2000073025A2 - Moulds for cementitious material - Google Patents
Moulds for cementitious material Download PDFInfo
- Publication number
- WO2000073025A2 WO2000073025A2 PCT/ZA2000/000096 ZA0000096W WO0073025A2 WO 2000073025 A2 WO2000073025 A2 WO 2000073025A2 ZA 0000096 W ZA0000096 W ZA 0000096W WO 0073025 A2 WO0073025 A2 WO 0073025A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coffer
- recess
- bracket
- flange
- reinforced
- 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.)
- Ceased
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
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
Definitions
- This invention relates to moulds for the casting of cementitious mate ⁇ al and more particularly to coffers used for the casting of coffer slabs
- coffers are widely known to provide slabs with strengthening ribs integral with and projecting from the underside of the slab These ribs are often specially used for architectural aesthetic appearance as well as for their functionality
- the coffers which have been used for many years are either fabricated from steel plate or moulded from glass fibre reinforced resin
- the former are necessarily heavy constructions which in practice have had to be fitted with specially formed corner plates in order to provide proper casting and finish to the slabs where these coffers are used
- the coffers are thus expensive and heavy to manipulate
- the glass fibre reinforced resin coffers are readily subject to damage This spoils the surface on which the cementitious material is cast with consequent degrading of the finish of the cast slab Serious damage by cracking through the coffers necessitates the coffer being entirely replaced OBJECT OF THE INVENTION
- edge of the recess to have a peripheral flange projecting away from the recess and for the flanges to terminate in a rib directed away from the recess
- the invention also provides for the flanges to be reinforced and to have gusset plates supporting the corners of the coffer
- Still further features of this invention provide for the flanges to be reinforced by folded angle sectioned members or by having the free ends of the ribs folded back upon itself.
- gusset plates to be triangular and of flat or folde'd plate
- the invention still further provides for the bottom of the recess to be perforated
- FIG 1 is an oblique view of one form of coffer
- FIG 2 an oblique view of an alternative embodiment
- the coffer (1) is made from mild steel plate which can conveniently be 1 2 mm thick
- the material can be a normal drawing quality mild steel such as that supplied by Iscor as "SUPRA 180" and the grid size may be 900 mm by 825 mm with a depth of 325 mm for example Sheets of this material can be deep drawn in a heavy duty die set
- the coffer will have the recess (2) centrally located in a rectangular sheet of material (3) while a peripheral flange (4) projects away from the recess (2) of the coffer
- the edge (5) of the flange (3) is folded to also project away from the recess (2) to form a rib (6)
- the flange (3) and rib (6) are supported by angled sectioned members (7) folded from similar metal and welded into position as shown
- Fig 2 the coffer is illustrated as formed from a square sheet of metal
- Reinforcement of the flange (3) around the recess is effected by having the free end of the rib (6) folded back upon itself.
- Each corner of the coffer is strengthened against damage by a triangular gusset in the form of a bracket (9).
- the reinforcing bracket (9) is folded from steel plate (as indicated in th ⁇ insert in the drawing) and subsequently welded into position
- the side walls (10) of the recess (2) can also be reinforced with either permanent braces welded into place or by braces which may be packed into place to provide the desired support
- the braces will preferably support a substantial area of the inner wall of the recess.
- One advantage of the removable support is that the walls can be allowed to flex once the cementitious mix with which the coffers are used has set. This will facilitate stripping of the coffers.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention concerns a coffer (1) for casting cementitious slabs which is deep drawn from suitable steel slab to form a recess (2) with a reinforced peripheral flange (4) extending from the edge of the recess (2). The corners are supported by triangular brackets (9).
Description
MOULDS FOR CEMENTITIOUS MATERIAL
FIELD OF THE INVENTION
This invention relates to moulds for the casting of cementitious mateπal and more particularly to coffers used for the casting of coffer slabs
BACKGROUND TO THE INVENTION
The use of coffers is widely known to provide slabs with strengthening ribs integral with and projecting from the underside of the slab These ribs are often specially used for architectural aesthetic appearance as well as for their functionality
The coffers which have been used for many years are either fabricated from steel plate or moulded from glass fibre reinforced resin The former are necessarily heavy constructions which in practice have had to be fitted with specially formed corner plates in order to provide proper casting and finish to the slabs where these coffers are used The coffers are thus expensive and heavy to manipulate
The glass fibre reinforced resin coffers are readily subject to damage This spoils the surface on which the cementitious material is cast with consequent degrading of the finish of the cast slab Serious damage by cracking through the coffers necessitates the coffer being entirely replaced
OBJECT OF THE INVENTION
It is the object of the present invention to provide a coffer which can be used in place of those currently widely used
SUMMARY OF THE INVENTION
According to this invention there is provided a coffer for casting cementitious slabs which is deep drawn from suitable steel plate
Further features of this invention provide for the edge of the recess to have a peripheral flange projecting away from the recess and for the flanges to terminate in a rib directed away from the recess
The invention also provides for the flanges to be reinforced and to have gusset plates supporting the corners of the coffer
Still further features of this invention provide for the flanges to be reinforced by folded angle sectioned members or by having the free ends of the ribs folded back upon itself.
Yet further features of this invention provide for the gusset plates to be triangular and of flat or folde'd plate
The invention still further provides for the bottom of the recess to be perforated
Embodiments of this invention are described below with reference to the accompanying drawings in which
FIG 1 is an oblique view of one form of coffer, and
FIG 2 an oblique view of an alternative embodiment
Referring to Fig 1 the coffer (1) is made from mild steel plate which can conveniently be 1 2 mm thick The material can be a normal drawing quality mild steel such as that supplied by Iscor as "SUPRA 180" and the grid size may be 900 mm by 825 mm with a depth of 325 mm for example
Sheets of this material can be deep drawn in a heavy duty die set
The coffer will have the recess (2) centrally located in a rectangular sheet of material (3) while a peripheral flange (4) projects away from the recess (2) of the coffer
The edge (5) of the flange (3) is folded to also project away from the recess (2) to form a rib (6)
The flange (3) and rib (6) are supported by angled sectioned members (7) folded from similar metal and welded into position as shown
At each corner the free flange (8) of the members (7) are braced by a gusset (9) in the form of a triangular plate
In Fig 2 the coffer is illustrated as formed from a square sheet of metal
Reinforcement of the flange (3) around the recess is effected by having the free end of the rib (6) folded back upon itself.
Each corner of the coffer is strengthened against damage by a triangular gusset in the form of a bracket (9). The reinforcing bracket (9) is folded from steel plate (as indicated in thέ insert in the drawing) and subsequently welded into position
The side walls (10) of the recess (2) can also be reinforced with either permanent braces welded into place or by braces which may be packed into place to provide the desired support The braces will preferably support a substantial area of the inner wall of the recess. One advantage of the removable support is that the walls can be allowed to flex once the cementitious mix with which the coffers are used has set. This will facilitate stripping of the coffers.
Centrally of the base of the recess (2) will be an aperture through the material This is provided to enable air under pressure to be blown into the recess (2) in the event that the coffers are for any reason difficult to remove
It will be appreciated that the embodiments above described can be varied in detail without departing from the scope of this invention Of course the coffers can vary in size and depth to meet particular requirements
The coffer has been found effective in use and inadvertent damage to the side of the coffer simple to repair. The cost saving in the manufacture of the moulds has proved to be considerable.
Claims
1 A coffer for casting cementitious slabs which is deep drawn from suitable steel plate.
2. A coffer as claimed in claim 1 in which a peripheral flange is provided around the edge of a recess adapted to form the coffer, the flange terminating in a rib bent to project away from the recess.
3. A coffer as claimed in claim 1 or 2 in which the flange is reinforced and the corners supported by a triangular bracket.
4. A coffer as claimed in claim 3 in which the reinforcing is provided by angle sectional members welded against the ribs.
5. A coffer as claimed in claim 3 in which the reinforcing is provided by having the free end of the rib folded back upon itself.
6. A coffer as claimed in any one of claims 3 to 5 in which the bracket is a flat plate.
7. A coffer as claimed in any one of claims 3 to 5 in which the bracket is a flat plate with a folded peripheral flange.
8. A coffer as claimed in any one of the claims 3 to 7 in which the reinforcing member and/or the bracket are welded in position.
9. A coffer as claimed in any one of the preceding claims in which the side walls of the recess are reinforced.
10. A coffer as claimed in any one of the preceding claims in which the bottom of the recess is perforated.
11. A coffer substantially as described with reference to Fig 1 or Fig 2 of the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU14990/01A AU1499001A (en) | 1999-05-28 | 2000-05-16 | Moulds for cementitious material |
| EP00974147A EP1115533A2 (en) | 1999-05-28 | 2000-05-16 | Moulds for cementitious material |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA993633 | 1999-05-28 | ||
| ZA99/3633 | 1999-05-28 | ||
| ZA99/5053 | 1999-08-06 | ||
| ZA995053 | 1999-08-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2000073025A2 true WO2000073025A2 (en) | 2000-12-07 |
| WO2000073025A3 WO2000073025A3 (en) | 2001-02-01 |
Family
ID=27145315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ZA2000/000096 Ceased WO2000073025A2 (en) | 1999-05-28 | 2000-05-16 | Moulds for cementitious material |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1115533A2 (en) |
| AU (1) | AU1499001A (en) |
| WO (1) | WO2000073025A2 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR324947A (en) * | 1902-10-03 | 1903-04-15 | St Mezard Mars | Molding process for ceramic tiles and other objects |
| US2662262A (en) * | 1952-11-05 | 1953-12-15 | Joseph C Wollard | Expansible mold for casting concrete fence posts |
| FI82412C (en) * | 1988-07-14 | 1991-03-11 | Neste Oy | Plastic with metal surface and process for making it |
| FR2667816B1 (en) * | 1990-10-11 | 1996-01-19 | Serantoni Jean Pierre | PROCESS FOR MANUFACTURING CONCRETE MOLDED MATERIALS. |
| GB2259271A (en) * | 1991-08-29 | 1993-03-10 | Concrete Machinery Systems Lim | Casting blocks |
| EP0919345A1 (en) * | 1997-11-25 | 1999-06-02 | FOMB Officine Meccaniche Bongioanni S.r.l. | A process for preparing a mould with replaceable stamping surface for clay manufactured articles |
-
2000
- 2000-05-16 EP EP00974147A patent/EP1115533A2/en not_active Withdrawn
- 2000-05-16 AU AU14990/01A patent/AU1499001A/en not_active Abandoned
- 2000-05-16 WO PCT/ZA2000/000096 patent/WO2000073025A2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000073025A3 (en) | 2001-02-01 |
| EP1115533A2 (en) | 2001-07-18 |
| AU1499001A (en) | 2000-12-18 |
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