Device for pressing a non-hardened concrete composition and method for the manufacture of concrete articles

Abstract

Device for pressing a non-hardened concrete composition into a desired form includes an upper plate with first cavities running through the upper plate, a moulding plate with one or more second cavities whereby the upper plate is located directly above the moulding plate, a bottom plate located under the moulding plate whereby the bottom plate closes the one or more second cavities on the bottom, whereby the upper plate and the moulding plate can move horizontally in relation to each other between a first position in which the one or more first cavities are directly and exactly above the one or more second cavities and a second position in which the one or more first cavities are not above the one or more second cavities, wherein the thickness of the upper plate and not the thickness of the moulding plate is decisive for the thickness of the final article.

Claims

1. A device (1) for pressing a non-hardened concrete composition (12) into a desired form, comprising: an upper plate (4) with one or more first cavities (7) that run through the upper plate (4); a moulding plate (3) with one or more second cavities (9), the upper plate (4) located directly above the moulding plate (3); a bottom plate (2) located under the moulding plate (3); and one or more stamps (5) located above the one or more second cavities (9), the upper plate (4) and the moulding plate (3) configured to move horizontally in relation to each other between a first position, in which the one or more first cavities (7) are directly and exactly above the one or more second cavities (9), and a second position, in which the one or more first cavities (7) are not above the one or more second cavities (9), a thickness of the upper plate (4) and not a thickness of the moulding plate (3) being decisive for a thickness of a final article produced by the device (1), the upper plate (4) and the moulding plate (3) configured to move vertically together between a lowest position, in which the bottom plate (2) closes the one or more second cavities (9) at a bottom of the moulding plate (3), and a highest position, in which the one or more second cavities (9) at the bottom of the moulding plate (3) is open such that non-hardened concrete articles (13) within the one or more second cavities (9) may exit from the one or more second cavities (9), and the one or more stamps (5) configured to move vertically through the upper plate (4) and the moulding plate (3) when the first cavities (7) are exactly above the second cavities (9) in the first position.

2. The device according to claim 1, wherein the upper plate (4) can be moved horizontally and the moulding plate (3) cannot be moved horizontally.

3. The device according to claim 1, wherein the bottom of the moulding plate (3) is provided with upstanding edges (10) around the one or more second cavities (9), the upstanding edges (10) forming a part of a wall of the one or more second cavities (9), and the upstanding edges rest on the bottom plate, such that a remainder of the moulding plate is free of the bottom plate.

4. The device according to claim 1, wherein the bottom of the moulding plate (3) has upstanding edges (10) around the one or more second cavities (9), whereby the upstanding edges (10) form a part of a wall of the one or more second cavities (9), whereby recesses (11) are formed between the second cavities (9) on the bottom of the moulding plate (3).

5. The device according to claim 1, wherein the one or more first cavities (7) are wider at a top thereof than at a bottom thereof, whereby seen from bottom to top there is no step-wise broadening in one or more first cavities (7).

6. The device according to claim 1, wherein a top of the first cavities (7) has a bevelled edge (8) to guide the stamps (5).

7. The device according to claim 1, wherein the bottom plate (2) is configured to move upwards toward the bottom of the moulding plate (3) and to move downwards away from the bottom of the moulding plate (3).

8. The device according to claim 7, wherein the non-hardened concrete articles (13) are released from the device via a combination of an upwards movement of the upper plate (4) and the moulding plate (3) toward the highest position, and a movement of the bottom plate (2) away from the bottom of the moulding plate (3).

9. A method to manufacture one or more concrete articles (13), comprising: a first step of putting a non-hardened concrete composition (12) into one or more first cavities (7), whereby the one or more first cavities are applied in an upper plate (4) and whereby the one or more first cavities (7) on the bottom are closed by a moulding plate (3), whereby a thickness of the upper plate (4) and not a thickness of the moulding plate (3) is decisive for a thickness of a final article (13); a second step of moving the upper plate (4) and the moulding plate (3) horizontally in relation to each other until the one or more first cavities (7) are exactly above one or more second cavities (9) in the moulding plate (3) such that the non-hardened concrete composition (12) falls into the one or more second cavities, whereby a bottom plate (2) located under the moulding plate (3) closes the one or more second cavities (9) on the bottom; and a third step of pressing the non-hardened concrete composition into the one or more second cavities (9) by one or more vertically movable stamps (5) located above the second cavities (9), wherein after the third step the pressed non-hardened concrete composition (12) is removed from the one or more second cavities (9), by either moving the upper plate (4) and the moulding plate (3) upwards or moving the bottom plate (2) downwards, or a combination of an upwards movement of the moulding plate (3) and the upper plate (4) and a downwards movement of the bottom plate (2).

10. The method according to claim 9, wherein in the first step the first cavities (7) are filled to the top with a non-hardened concrete composition (12).

11. The method according to claim 9, wherein the upper plate (4) and the moulding plate (3) are lifted while the stamps (5) do not move.

12. The method according to claim 9, wherein the bottom plate (2) is lowered to remove the pressed non-hardened concrete composition (12) from the one or more second cavities (9).

13. The method according to claim 9, wherein the method allows thin concrete articles to be manufactured by means of pressing.

14. The method according to claim 9, wherein the bottom plate (2) with the pressed articles (12) is removed from under the moulding plate (3) and replaced by another bottom plate (2), or whereby the bottom plate (2) moves horizontally as a continuous support when removing the pressed articles (12).

15. The method of claim 14, wherein the continuous support is an assembly line.

16. The method according to claim 9, wherein the bottom plate (2) is lowered to remove the pressed non-hardened concrete composition (12) from the one or more second cavities (9) whereby the stamps (5) move downwards to push the concrete articles (12) through the second cavities (9).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) With the intention of better showing the characteristics of the invention, a schematic embodiment of a device according to the invention is described hereinafter by way of an example without any limiting nature, with reference to the accompanying drawings, wherein:

(2) FIG. 1 schematically shows a perspective view of a device according to the invention;

(3) FIG. 2 on a larger scale shows a cross-section according to II-II; and

(4) FIGS. 3 to 8 show consecutive states during the use of the device of FIG. 1 in the same cross-section as FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(5) The device 1 to manufacture concrete articles shown in the figures chiefly consists of a wooden bottom plate 2, a moulding plate 3 located above it, an upper plate 4 located above the moulding plate, and a set of stamps 5 with a drive 6 to allow the stamps 5 to move vertically.

(6) The upper plate 4 is installed to move horizontally in the direction indicated by arrow P and back.

(7) The upper plate 4 and the moulding plate 3 are installed to move vertically together and in FIGS. 1 and 2 are shown in their lowest setting.

(8) The drives and supports to make these movements possible are not shown in the figures because they are well known to a person skilled in the art.

(9) The upper plate 4 has twelve first cavities 7, in this example but not necessarily with a length L of 40 cm and a width B of 5 cm.

(10) At the top the first cavities 7 have a beveled edge 8.

(11) The moulding plate 3 is provided with twelve second cavities 9, also with a length L of 40 cm and a width B of 5 cm. These second cavities 9 determine the form of the concrete articles to be produced.

(12) On the bottom of the second cavities 9 the moulding plate is provided with upstanding edges 10, such that recesses 11 are formed between the second cavities 9 on the bottom of the moulding plate 3.

(13) In the situation shown in FIGS. 1 and 2 the stamps 5 are above the second cavities 9. The first cavities 5 have moved in relation to the second cavities 9, such that parts of the moulding plate 3 between the second cavities 9 close the bottom of the first cavities 7.

(14) The operation of the device 1 is simple and as follows. This is explained using FIGS. 2 to 8.

(15) At the start, the device 1 is as shown in FIG. 2. In a first step the first cavities 7 are filled to the top with a non-hardened concrete composition 12. Thanks to the underlying moulding plate 3 this concrete composition 12 cannot go anywhere. This is shown in FIG. 3.

(16) In a second step the upper plate 4 is moved horizontally, as indicated with arrow P, until the first cavities 7 are exactly above the second cavities 9. The concrete composition 12 of the first cavities 7 hereby falls in the second cavities 9. This is shown in FIG. 4.

(17) In a third step the stamps 5 are moved down with force, as indicated by arrow Q and the stamps 5 press the concrete composition 12. Hereby, as is usual when pressing concrete articles, vibration is applied to enhance the compactness of the concrete composition 12.

(18) Hereby, the beveled edges 8 of the first cavities 7 guide the stamps 5.

(19) A pressed non-hardened concrete article 13 has now been formed, in this example a strip with a thickness D of 2 cm. This is shown in FIG. 5.

(20) In a next step the moulding plate 3 and the upper plate 4 are lifted, as indicated by arrow R, while the stamps 5 do not move with them.

(21) In an alternative embodiment, to remove the final articles 13 from the moulding plate, the moulding plate 3 and the upper plate 4 are not lifted (and remain in position) but the bottom plate 2 is lowered. A combination of both movements, an upwards movement of the moulding and upper plate and a downwards movement of the bottom plate, is also within the scope of the invention.

(22) The consequence of this is that the non-hardened concrete articles 13 are removed from the second cavities 9. This state, with the moulding plate 3 and the upper plate 4 in their highest setting, is shown in FIG. 6.

(23) The stamps 5 are then moved up again. Now the non-hardened concrete articles 13 are free on the bottom plate 2. This is shown in FIG. 7.

(24) The whole bottom plate 2 is now removed, such that the non-hardened concrete articles 13 can harden elsewhere and a new bottom plate 2 is placed.

(25) The upper plate 4 is also moved back horizontally to its original position in relation to the moulding plate 3.

(26) This is shown in FIG. 8.

(27) Then the moulding plate 3 and the bottom plate 4 are put back in their bottom position, such that the device returns to the starting situation of FIG. 2.

(28) The present invention is by no means limited to the embodiment described as an example and shown in the figures, but a device and method according to the invention can be realised in all kinds of forms and dimensions without departing from the scope of the invention.