CA1178796A - Injection mold for prefabricated concrete articles - Google Patents

Abstract

The molds that currently exist and that are used for the manufacture of concrete blocks are made of metal or wood. They are also large and heavy and require a lot of space for storage and use. In the present invention, the molds are made of plastic and they are of various dimensions depending on the size of the desired block. They are light and not fixed and can also be easily handled. They are additionally provided with handles which further facilitate handling. This invention is useful in that it makes it possible to pile up and stack the molds to save space, in that it allows faster delivery of the blocks since the drying does not have to be completely completed before , in that it would eventually allow an individual to manufacture his concrete blocks without equipping himself with any bulky infrastructure and in that it accelerates the drying time by reducing the surfaces. As the molds are disposable after use and can be produced at a reasonable cost, they do not require space to be stored after use in cases where it is not expected to be needed a second time.

Description

117137 ~ 6 DESCRIPTIVE MEMORY

The present invention consists essentially of a plastic mold for molding precast concrete.

The tool previously used to mold the blocks of concrete was a mold of steel, or of wood with a hatched bottom. The hatch pattern in the bottom of the mold determined the appearance of all the mold blocks in this mold. We were emptying the stick in this mold and we covered the mold with a form of metal which had only ribs which would join the bottom of the large mold thus determining the number of blocks obtained according to the dimensions given to each compartment of the form. When drying, a number of concrete blocks were thus form. These molds in two (2 ~ pieces had the desa-advantage of being heavy and often bulky, which complicated their handling and required a certain space to operate. In addition, the drying time was longer because of the tightness of the metal of the bottom mold. For of-mold the concrete and to take off the concrete block from mold walls, an additional vibration step was necessary. The blocks were then removed from the molds and using a plate we used to transport them, they were stacked on top of each other to complete the drying ge. Finally, after demolding, washing the mold was also necessary before recommencing a new molding.

The mold that I invented eliminates these drawbacks, that it is made of plastic and always comes in an indi-vuel. It is made from a mold-my ~ braid , ~

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1171 ~ 1'7 ~ 6 ... / 2 steel into which plastic is injected. This process is inexpensive and therefore makes it possible to make disposable molds after use if desired, although reusable at some repri-its because of its solidity. The mold is lighter and made in one piece. It is easily transportable and several molds can conveniently be stacked on top of each other or stored in shelves, saving space. As they are relatively small and plastic, drying is accelerates, therefore deliveries by the same fact. Handling and mold transport are facilitated by molded handles on all sides as well as the fact that the mold is everything of a room. Demoulding is also easier, plastic being a substance that offers less retention and we only have invert the mold and the adhesive block. It’s when the takeoff Age becomes more difficult after several casts, that it is time to throw away the mold.

Once the molds are made, the process is very simple.
please empty the precast concrete and mold it when the concrete is dry to obtain molds with varied patterns.
The four ~ 4) reasons in which the molds are shown in Figures 1, 2, 3 and 4.

Figure 5 shows in plan my invention and corresponds to two (2) different sizes.

Figure 6 represents my invention seen in perspective.

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1 ~ 71 ~ 7 '~ 6 The hatched spaces in Figure 5 represent the background of my invention which is numbered by number 1.

The sides of my invention are represented by the number

2 of Figure 6.

The handles of my invention are represented by the nu-m ~ ro 3 of Figure 6.

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Claims

CLAIM

The embodiments of the invention about which an exclusive right of property or privilege is claimed, are defined as follows:

"A mold of injected plastic made in one piece for manufacture concrete blocks, said mold comprising a flat bottom and rectangular having any pattern to form a pattern corresponding on the concrete blocks, vertical sides on the along the perimeter of the bottom forming a continuous wall around the bottom, at least two opposite sides with indentations on the outside to form molded handles, said recesses passing through only partially said opposite sides, the inside of the sides being of a flat surface and forming with said bottom a compartment waterproof, and the thickness of the sides being such that the mold can be handled and lifted by the handles when the mold contains a concrete block "