US818286A - Process of molding concrete bricks or blocks. - Google Patents

Description

N0` 818,286. PATENTED APR. 17, 1906. W. PORTI-JN.

PROCESS 0F MOLDING CONCRETE BRICKS OR BLCCKS. APPLICATION MLBD SBF120, 1905.

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T0 all whom, it may concern:

St. Paul, Ramsey county, Minnesota, have `Bricks cr Blocks, of which the following is a iJNTTEn STATES PATENT fonnion.

Specification of Letters Patent.

WILLIAM PORTEN, OF ST. PAUL, MINNESOTA. PROCESS CF MOLDING CONCRETE BRICKS OR BLOCKS.

1:ate11teol April 17, 1906.

Application filed September 20, 1905. Serial No. 279,249.

Be it known that I, WILLIAM PoRTEN, of

invented certain new and useful Improvements in a Process of Molding Concrete sp ecificatir; n.

The object of my present invention is to provide a process of molding concrete bricks or blocks which will cause them to present a smooth -iinislied surface resembling diat of the ordinary pressed brick.

A further object is to provide a molding process by means of which the exposed surface of the brick or block can be rendered impervious to moisture, if desircfl.

My process consists, rst, in sifting into a mold having a hard smooth fioor a thin layer of cement neat or mixed with a fine grade of sand or with a suitable coloring, or with both, in the roper proportion to form a smoothnishe facing impervious to moisture and of the desired shade of color and then filling up and tamping the mold with a mixture of coarse sand and a comparatively less quantity of cement.

In carrying out my invention I may provide a mold such as is shown in the drawings, in which- Figure 1 represents a perspective view of a mold, showing the bricks or blocks after the molding operation is completed and before their removal. Fig. 2 is a similar view illustrating the bricks removed from the mold and showing the smooth-finished facing for the exposed surface of the brick. Fig. 3 illustrates the manner of molding a corner brick or block.

In carrying out my invention I provide a mold consisting of a frame 2, having a moldbox bed or base 3 hinged t" creen at 4. The

6, and a wall 7, parallel with the wall 5 and removably secured to the end walls by a lockand-latch device 8. A handle 9 is provided on the box for convenience in tilting it on its hinges to deposit the bricks upon the brackets 10 at the side of the machine. Smooth plates 11, preferably of metal, are provided in the bottom ofthe box with spaces between their contiguous edges, and vertically-movable partitions 12 are arranged to pass between the said plates, dividing the box into The partitions are raised and lowered by means of a rockl shaft 13, having connections 14 with the par titions and an operating-lever 15.

In construction the machine is substantially the same as the one described in a certain pending application for Letters Patent of the United States, filed by me on July 17, 1905, Serial No. 270,005.

To fri-rm smooth-finished surfaces on the faces of the brick, I sprinkle a mixture of fine sand and cement in the ratio of about two to one in the bottom of each mold and then fill the meld with a mixirture of coarser sand and cement in the ratio of about five to one and then tamp the mold contents down firmly upc-n the smooth plates at the bottom, and when the bricks are removed one face, as shown in Fig. 2, will have a smooth-finished surface very similar to that of a pressed brick. If it is desired to render the face of the brick impervious to moisture, then a smaller percentage of sand is used for the facing or omitted entirely, the facing being' made up oi cement neat with a backing of coarse sand and cement of any suitable proportions. If it is desired to provide a colored face for the brick, the cement and sand are mixed with a suitable portion of mineral orf. i

other suitable coloring, or a cement and coloring mixture may be employed Without any sand. If a large percentage of the facing is composed of cement or it is made entirely of cement, the facing will be less pervious to moisture than where a considerable percentage of sand is used, and the shade of the facing will also be determined by the quantity of coloring therein.

In Fig. 3 I have shown the process adapted for forming a corner brick or block where it is desirable :to form a finished facing on the end as well as the side of the block. In this figure 16 represents a division-plate that is inserted into the mold near one of the side walls, which has a smooth surface corresponding to the plates at the bottom of the mold. This division-plate is held vertically in the mold and the mixture filled in on both sides until a thin layer is formed on the bottom and between the division-plate and the side wall. Then the coarser mixtures is spread upon the bottom layer and the division-plate raised and the mixtures tamped down together. Then the mold is filled With the coarser mixture and the divisionlate removed and the whole contents of t e mold firmly tamped, and when the blockfis re- 1rol ICO IOS

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moved one side and end will have a smooth hard face, Which may be impervious to moisture, depending upon the percentage of cement used, and of any suitable color. If a rock-face is desired on the block, the smooth side Wall is removed from the mold and one having a rough uneven surface substituted therefor. If preferred, rough plates may be employed in the bottom of the mold to form a rock-face on the side of the block. lfVhen the mold has been filled and tamped, a pallet 17 is laid thereon, and the operator, holding the pallet firmly, Will grasp the handle 9 and invert the mold-box on its hinges until the pallet rests upon the brackets l0, the vertical partitions 12 havin been previously withdrawn from the mol -box by the operation of the lever 15. As soon as the pallet rests upon the brackets 10 the operator will swing the Inold back to its normal position upon the frame of the machine, leaving the blocks resting upon thelpallet and ready to be taken 'away to dry. The partition-plates are then raised, the facing material placed in the bottom of the mold, and the operation described repeated.

I cla-im as my inventionl. A process of molding concrete bricks or blocks Which consists in placing a thin layer of cement in a mold having a hard smooth floor to form on the block a finished facing impervious to moisture, and then filling up and tamping the mold with a mixture of coarse sand and cement to form a comparatively porous backing, substantially as described.

2. A rocess of making aconcrete'brick or block W .ch consists in placing a thin layer of fine sand and cement mixed 1n suitable proportions in a mold having a hard smooth floor to form a finished facing on the block, and then illinCr up and tamplng the mold with a mixture of coarser sand and proportionately less cement whereby a softer, more ervious backing will be formed, substantial y as described. y

3. A rocess of making a concrete brick or block which consists in placinfr in a mold having a hard smooth floor a thinayer of cement and coloring mixture in suitable proportions to produce the desired shade of color and form a smooth-finished facing on the brick, and then filling up and tamping the mold With a mixture of coarse sand and proportionately less cement whereby a softer, more pervious backing Will be formed.

4. A process of making a concrete brick or block Which consists in placin in a mold having a hard smooth floor a thin ayer of cement mixed with fine sand and coloring in suitable proportions to produce the desired shade of color and form a hard'giishedfaingon the brick, and then filling up and tamping the mold with a mixture of coarse sand and proportionately less cement, substantially as described.

5. A process of making a concrete brick or block which consists in placing a vertical division-plate in a mold having a smooth hard floor and a smooth vertical Wall near said plate and sifting a cement mixture upon the bottom of the mold and filling the space between the division-plate and the vertical Wall with the same material to form horizontal and vertical facings, then placing a mixture of coarse sand and cement upon said horizontal facing and raising the division-board and tamping the mixtures together, and finally completely. filling the mold With said lastnamed mixture to form a backing for said horizontal and vertical facing-layers and entirely removing the division-plate and tamping the mixtures together, substantially as described.

6. A process of making a concrete brick or block which consists in placing a vertical division-plate in a mold having a iioor and a vertical wall near said plate and sifting a cement mixture upon the bottom of the mold and filling the space between the; divisionplate and the vertical Wall with the same material to form horizontal and vertical facings, then placing a mixture of coarse sand and cement upon the said horizontal facing and raising the division-board and tamping the mixtures together, and finally filling the mold With said last-named mixture to form a backing for said horizontal and vertical facinglayers and entirely removing the divisionplate and tamping the mixtures together, substantially as described. l

In witness whereof I have hereunto set m hand this 16th day of September, 1905.353@

l/VILLIAM PORTEN lVitnesses f' RICHARD PAUL, C. MACNAMARA.

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