EP1019226B1 - Unitary paver mold - Google Patents
Unitary paver mold Download PDFInfo
- Publication number
- EP1019226B1 EP1019226B1 EP98946851A EP98946851A EP1019226B1 EP 1019226 B1 EP1019226 B1 EP 1019226B1 EP 98946851 A EP98946851 A EP 98946851A EP 98946851 A EP98946851 A EP 98946851A EP 1019226 B1 EP1019226 B1 EP 1019226B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- cavities
- unitary body
- concrete
- forming mold
- 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 - Lifetime
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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
- B28B7/0029—Moulds or moulding surfaces not covered by B28B7/0058 - B28B7/36 and B28B7/40 - B28B7/465, e.g. moulds assembled from several parts
-
- 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
- B28B7/24—Unitary mould structures with a plurality of moulding spaces, e.g. moulds divided into multiple moulding spaces by integratable partitions, mould part structures providing a number of moulding spaces in mutual co-operation
Definitions
- the present invention relates to a mold for forming molded concrete products, and, more particularly, to a unitary mold for forming molded concrete products.
- a novel self-aligning mold box assembly for use in a machine for forming concrete products such as the machine disclosed in U.S. Patent No. 5,395,228 to Aeseth et al., is disclosed in my U.S. Patent No. 5,743,510, and which is directed to the mold box depicted in FIG. 1.
- Fig. 1A included therein is an exploded view of a prior art paver grid assembly 100, which includes a paver grid 110 and a paver grid frame 112. In operative condition, paver grid 100 is secured to and contained within frame 112. The upper surfaces of the paver grid and frame are substantially coplanar when the grid and frame are in operative condition.
- Paver grid frame 112 includes a pair of opposed mounting brackets 114, 116.
- Each of the mounting brackets has a pair of upwardly directed mounting surfaces, like surfaces 118, 120 on bracket 114.
- Each mounting surface 118, 120 includes a pair of bolt holes therethrough.
- Mounting bracket 116 includes mounting surfaces and bolt holes that are substantially symmetrical with mounting surfaces 118, 120 and the bolt holes therein.
- a head assembly 122 is, in operative condition, mounted on a machine for making concrete products like that shown in Fig. 1B.
- the head assembly includes plurality of compression shoes, like shoe 124, which are aligned with corresponding cavities in paver grid 110, also mounted on the machine.
- Fig. 1B indicated generally at 128 is a machine for molding concrete blocks and pavers. Included therein are four blocks, like block 130, arranged on pallet 126.
- the mold that formed blocks 130 has been removed from the machine.
- the visible portion of the mounting structure comprises a die support 131.
- a pair of bolt heads can be seen extending downwardly from die support 131.
- mounting surface 120 Fig. 1A
- Each of the other mounting surfaces on paver grid assembly 100 are urged against corresponding die supports (not visible).
- the bolts visible in Fig. 1B are thereafter used to bolt each of the mounting surfaces firmly against the underside of the die support thereby securing paver grid assembly on machine 128.
- the mold box is vibrated by a pair of opposed vertical vibrating rods 132, 133.
- Another die support (not visible) is located adjacent rod 133.
- a semicircular notch between mounting surfaces 118, 120 is formed to accommodate vibrating rod 132.
- Vibrating rod 133 is similarly accommodated by corresponding structure (not visible) on mounting bracket 116.
- the vibrating rods like rod 132, vibrate the mold while the shoes, like shoe 124, compact wet concrete product into the cavities.
- the vibration during compaction increases density, and therefore strength, of the molded concrete product.
- Mold boxes are still used because heretofore, molds have been limited to the equivalent of three 406.4mm ("16 inch blocks") per mold.
- the maximum of three "sixteens" per mold has long been recognized as the practical upper limit to the size of a mold which can withstand the high-speed, low-displacement vibration applied to the mold to compact the green concrete once in the mold.
- apparatus and methods have been developed in which multiple individual 3 - 203.2mm x 203.2mm x 406.4mm (8"x8"x16" molds are inserted into a single "mold box", which in turn is mounted on the forming machine as described generally in the reference discussed above. While notable advances have been realized in "mold box” technology, the mounting of multiple molds in mold boxes nonetheless represents a significant limitation in the production of formed concrete products.
- FR-A-2 649 139 discloses a unitary mold for the manufacture of cast concrete items.
- a unitary mold is provided defining a plurality of cavities for receiving cement which in number exceed that heretofore achievable, and which does not require a mold box for support.
- the unitary mold of the embodiments of the present invention includes upper and lower surfaces, opposed side and end portions, and internal surfaces which define a plurality of concrete-receiving voids.
- mounting spacers are mounted on the lower surface of the unitary mold adjacent each end. The mounting spacers include precisely positioned holds for receiving locating pins to precisely locate the unitary mold on a support surface. Also mounted on the bottom surface adjacent each side are mounted longitudinal support rails.
- Unitary paver mold 10 includes a mold grid member shown generally at 12 which includes a central mold grid 13 disposed within sides 14 and 16, and ends 18 and 20. Mold grid 13 defines multiple openings 21 which are shaped to form concrete to the desired shape, and which are open on the top and bottom (FIG. 6). Openings 15 are formed in mold grid member 12 to equalize the thermal mass distribution across the span of the mold grid member. Equalization of the thermal mass promotes even heating and cooling of the member during heat treating, and results in less distortion of the member during heating and cooling. Each opening 15 is covered by a plate 17 as shown in FIG. 7, and which is welded into place on the top surface of the mold grid member 12. Mounted on the upper surface of the mold grid member 12 are pan angles 19 and 25 which serve to contain wet concrete in the mold grid member.
- unitary paver mold 10 includes longitudinal support rails 22 and 24 (22 only shown) which are mounted with bolts 26 to the bottom surfaces of sides 14 and 16 respectfully, and which are parallel to and positioned outside of the lateral edges of mold grid 12.
- Support rails 22 and 24 in the preferred embodiment are 127mm (5") tall and serve to limit deflection of the mold grid member as described more fully below.
- a mounting spacer 28 is mounted on the lower surface of the mold grid 12, and serves to precisely space the unitary paver grid 10 above a supporting platen 30 in the molding machine 32 as shown in FIGS. 16 and 17.
- a unitary paver mold according to the present invention is filled with wet concrete, the wet concrete is compacted by a pneumatically activated press 34 as shown in FIG. 14.
- the filled mold assembly is vibrated at a relatively high frequency, e.g. 50 hz., and a displacement of from 1.27 to 2.54mm (0.050 to 0.100"). Doing so naturally exerts high bending moments in the mold.
- Applicant's invention provides, for the first time, a unitary mold which has a capacity of greater than the equivalent of 3 -203.2mm x 203.2mm x 406.4mm (8"x8"x16”) blocks, which exhibits acceptably low bending displacement during vibratory compaction of the wet concrete, and which is readily easily used with existing molding machine designs.
- a paver mold as shown in Figs. 2-3A, when vibrated at 50 hz. and a displacement of 2.286mm (0.090") exhibited vertical bending at its longitudinal midpoint of approximately 0.2159mm (0.0085”), which is well within the acceptable maximum of 0.254mm (0.010").
- Paver grid 134 is constructed in accordance with the present invention and includes a substantially planar grid plate 136 in which a plurality of cavities are formed for molding concrete pavers, like those shown on pallet 126.
- a pair of stiffener rails 138, 140 are bolted to the underside of grid plate 136 as shown.
- Each end of grid plate 136 includes a mounting plate, like mounting plate 142, bolted thereto via bolts (not shown) received in four bores, like bore 144, in grid plate 136.
- FIGs. 19-23 another embodiment of the paver grid depicted in Fig. 18 is shown. As can be seen, it includes larger cavities, and therefore a fewer number of cavities, for molding larger concrete products than the paver grid in Fig. 18. Numerals corresponding to those used in Fig. 18, however, are used in Figs. 19-23 to identify similar structure.
- Each mounting plate includes a pair of upwardly directed mounting surfaces, like surfaces 146, 148 on mounting plate 142.
- Mounting plate 142 is received in a recess 150 formed on the underside of grid plate 136, as best view in Fig. 21.
- Plate 142 is secured to grid assembly 136 via four bolts (not shown) received through countersunk bores, like bore 144, in grid plate 136, and coaxial bores (visible in dashed lines in Fig. 23) in the mounting plate.
- Rails 138,140 are likewise bolted to the underside of grid plate 136.
- mounting surfaces 146,148 are urged against the underside of the die supports, like die support 131, on machine 128 and are thereafter bolted in the same fashion as the prior art paver grid assembly of Fig. 1A. Molding a product thereafter proceeds as previously described, and as is well known in the art. Stiffener rails 138, 140 prevent excessive flexing of paver grid 136 during the manufacturing process. Paver grid assembly 134 is cheaper to make than the prior art paver grid of Fig. 1A because it has fewer parts. In addition, the sides of the grid need not be machined to fit in a frame as in the prior art. Only the undersurfaces to which the rails and mounting plates are bolted need be machined to permit securing parts together.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Moulds, Cores, Or Mandrels (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Road Paving Structures (AREA)
Description
That invention increased vibration control in a concrete product forming machine, reduced the amount of time required to mold concrete products, increased the homogeneous consistency of concrete products, and reduced the amount of time required to exchange and align molds in a concrete product forming machine.
Claims (11)
- A concrete product-forming mold (10) comprising:a unitary body (12) having a peripheral edge defined by laterally separated side edges and longitudinally separated end edges; andan array of cavities (21) formed in the unitary body; characterised in thata pair of stiffener rails (22, 24) are formed or mounted longitudinally along the unitary body and secured to a lower surface of the unitary body.
- A concrete product-forming mold (10) according to claim 1 comprising:a unitary body (12) having opposed longitudinal side walls, opposed end walls, and a central portion defining an array of product-forming cavities, the central portion having a longitudinal midpoint;the array of product-forming cavities (21) including at least four cavities in the longitudinal dimension.
- A concrete product-forming mold (10) according to claim 2 wherein the longitudinal midpoint has a bending deflection of not more than 0.254 mm (0.010 inches) responsive to the mold being vibrated at approximately 50 Hz and 2.286 mm (0.090") displacement.
- A concrete producing-forming mold (10) according to any of the preceding claims wherein the longitudinal rails (22, 24) are laterally offset from the array of cavities.
- A concrete product-forming mold (10) according to any of the preceding claims, wherein:the array of cavities (21) is formed through the unitary body and passes from an upper surface of the unitary body to a lower surface; andthe pair of stiffener rails (22, 24) is secured to the lower surface of the unitary body (12) outside of the array of cavities and adjacent the side edges so that a pallet can be moved into position against an underside of the cavities to strip out concrete products formed within the cavities and forced out during a stripping process.
- A concrete product-forming mold (10) according to any of the preceding claims, further including a plurality of supplemental openings (15) formed through the unitary body adjacent the side edges and outside the array of cavities to equalize a thermal mass distribution across a lateral extent of the unitary body during heating and cooling.
- A concrete product-forming mold (10) according to claim 6 wherein at least one of the stiffener rails (22, 24) is mounted on the lower surface of the unitary body (12) over the supplemental openings (15).
- A concrete product-forming mold (10) according to claim 5 or any claim dependent thereon, further including a pair of pan angles (19, 25) mounted on the upper surface of the unitary body (12) adjacent the end edges and outside of the array of cavities (21) which serve to contain wet concrete as it is poured into the array of cavities.
- A concrete product-forming mold (10) according to claim 5 or any claim dependent thereon, further including a mounting spacer (28) secured to an extending below the lower surface of the unitary body (12) adjacent the end edges so that the mold (10) can be precisely spaced above a supporting platen on a concrete products forming machine during concrete products manufacturing.
- A concrete product-forming mold (10) according to any of the preceding claims, further including a mounting plate (142) secured adjacent each end edge and having a pair of upwardly directed mounting surfaces (146, 148).
- A concrete product-forming mold (10) according to claim 10, further including a recess (150) formed in the lower surface of the unitary body adjacent each end edge, said mounting plate (142) being secured within the recess.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US92378597A | 1997-09-04 | 1997-09-04 | |
US923785 | 1997-09-04 | ||
US7559 | 1998-01-15 | ||
US09/007,559 US6007321A (en) | 1997-09-04 | 1998-01-15 | Unitary paver mold |
PCT/US1998/018461 WO1999011443A1 (en) | 1997-09-04 | 1998-09-03 | Unitary paver mold |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1019226A1 EP1019226A1 (en) | 2000-07-19 |
EP1019226A4 EP1019226A4 (en) | 2000-12-06 |
EP1019226B1 true EP1019226B1 (en) | 2004-01-28 |
Family
ID=26677139
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98946851A Expired - Lifetime EP1019226B1 (en) | 1997-09-04 | 1998-09-03 | Unitary paver mold |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1019226B1 (en) |
AU (1) | AU9377998A (en) |
DE (1) | DE69821375T2 (en) |
ES (1) | ES2215322T3 (en) |
WO (1) | WO1999011443A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006026114A1 (en) * | 2006-06-03 | 2007-12-06 | Kobra Formen Gmbh | Arrangement for the production of concrete blocks by means of a mold held in a molding machine, a mold for such an arrangement and a method for producing such a mold |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2856668A (en) * | 1952-04-22 | 1958-10-21 | Dominaire Const Inc | Concrete block molding machine |
FR2649139B1 (en) * | 1989-06-30 | 1991-09-27 | Glanre Gaillard Ind | MOLDED CONCRETE PAVERS, AND METHOD FOR THE PRODUCTION THEREOF |
US5395228A (en) * | 1994-02-07 | 1995-03-07 | Columbia Machine, Inc. | Apparatus for forming concrete products |
US5743510A (en) * | 1994-12-21 | 1998-04-28 | Columbia Machine | Self-aligning mold box assembly |
US5542837A (en) * | 1995-01-13 | 1996-08-06 | Columbia Machine, Inc. | Mold box assembly with partition plates |
DE19622001A1 (en) * | 1996-05-31 | 1997-12-04 | Munderkingen Betonwerke | System for manufacturing concrete blocks |
-
1998
- 1998-09-03 DE DE69821375T patent/DE69821375T2/en not_active Expired - Lifetime
- 1998-09-03 WO PCT/US1998/018461 patent/WO1999011443A1/en active IP Right Grant
- 1998-09-03 ES ES98946851T patent/ES2215322T3/en not_active Expired - Lifetime
- 1998-09-03 AU AU93779/98A patent/AU9377998A/en not_active Abandoned
- 1998-09-03 EP EP98946851A patent/EP1019226B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69821375T2 (en) | 2004-07-01 |
AU9377998A (en) | 1999-03-22 |
ES2215322T3 (en) | 2004-10-01 |
EP1019226A1 (en) | 2000-07-19 |
DE69821375D1 (en) | 2004-03-04 |
WO1999011443A1 (en) | 1999-03-11 |
EP1019226A4 (en) | 2000-12-06 |
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