US1739677A - Method of manufacturing artificial stone - Google Patents

Description

Patented Dec. 17, 1329;

GEORGE Ev KENDALL, F KALAMAZOO, llIICI-IIGAN METHOD or MANUFACTURING vanarrator inszronn N0 Drawing.

The object of this invention is to provide an improved method and process of manufacture which Wlll secure an artificial stone with very dense smooth surface having the.

appearance of being polished in imitation of marble or any other cut face and polished I stone, and the improved product which may imitate marble or granite.

Objects pertaining to details will appear 1 from the detailed description to follow.

The invention is defined in the claims.

My improved method or process consists in providing a mold with a face plate for making the face of the stone which is impervious to moisture and smooth. This may be a glass sheet or sheet metal or any other material. I-then apply to the face plate a mixture of Portland cement, preferably one part cement to one part sand, using an excessive amount of'water far beyond what is necessary to set the cement. I mix the same and stir it so that it is of a paint-like con' sistency, with all colloids fully developed,

and apply it to the smooth face of the mold with a brush, thoroughly working it into contact with the said face, and placing the mold face plate down so that none of the moisture will drain off.

If it is desired to produce patterns in the stone in imitation of marble or other irregularity, I apply the pattern to this painted coating on the back side, forcing it. through the layer with a blunt pointed implement so that it penetrates to the face of the mold, 3 leaving a characteristic colored mark, ap-

plying in this way any coloring matter. Of course, to secure the most permanent results a mineral pigment is required.

When the surface has been thus prepared, 49 I fill the balance of the mold with a grout, preferably of four parts sandto one part cement, making it very wet so that it pours. As soon as this has partially set, or immediately if that is expedient, I place the mold face down so that it will accumulate water on'the face plate in excess of'that needed for the setting of the cement. I then cover the whole with damp sand of sufficient volume and thickness, or otherwise protect the same, to prevent evaporation. of the design.

Application filed March 5, 1926. Serial its; 92,636.

' moisture, retaining the same and allowing the cement to set, preferably for a period or not lessgthan ten days. A shorter period se- I cures only fair results and perfect results are not secured under ten days. -At the end of that time Iremove the block from the mold. It is necessary .to start atone edgeof the face,

plate and open it very carefully to admit air', which causes the film' 'of water to divide and separate, leaving a; surface which is .as

smooth as ordinary polished marble. This J surface must not be. touched because ltis appear to be of a crystalline cha-racteiy'but amorphous or waxy, as it can-be readily dented without breaking. The kind of Port land cement used is not material, so far as I have observed. Ifimitation marble is desired, I use white cement. If granite is desired, I use the ordinary gray cement. Either of these'c'an be colored as desired and with any suitable design. A very effective plain stone is secured without injecting in the I wish to claim theinvention broadly and specifically, and also the design and the coloring in the manner described, because the effect is very similar to the effect of natural marble or stone.

Having thus described my invention, What I claim as new and desire to secure by Letters Patentv is: I

1. The process of making artificial marble or stone consisting in providing a mold with a face plate of flat, smooth, impervious, waterproof material, applying thereto with the face plate down arich paint-like, wet mixture of cement with, a brush toidevelop the colloids and completely and closely cover the surface, injecting through the mixture suitable color designsby scratching with a blunt pointed instrument, thereafter cover ing the whole with grout of substantially four parts sand to one part cement, wetting the same thoroughly, placing the mold with face plate down, and covering the whole. with damp sand to retain the moisture, al-

lowing'it to stand a suflicient to fully separating the face plate from one edge carefully to insure the separation due to the film of Water formed between the face plate and the stone, as specified.

2. The process of making artificial marble p or stone consisting'in providing a mold with a face plate or fiat, smooth, impervious, waterproof material, applying thereto with the face plate down 3'IIlCl1,;PZLlI1iZ-llk6, Wet I 'mixture of cement with a brush to develop the colloids and completely and. closely. cover the surface, thereafter covering the Whole with grout of substantially four parts sand to one partcement, wetting the same thoroughly, placing the mold with face plate down,and Covering. the whole with damp sand "to retain the moisture, allowing the same to stand a sufficient time to fully set, then removing it from the mold, and separatingthe face plate 'fromone edge carefully to insure the separation due to the film of water formed between the face plateand the stone, as specified.

In witness whereof I have hereunto set my (hand. 7 I

' GEORGE KENDALL.