US1035562A - Device for grinding artificial-stone plates. - Google Patents

Description

F. FLORSTBDT.

DEVICE FOR GRINDING ARTIFICIAL STONE PLATES. APPLIOATION FILED Nov.15, 1909.

1,035,562. Patented Aug". 13,1912.

2 SHEETS-31131 1.

Ff FLORSTEDT. DEVICE FOR GRINDING ARTIFICIAL STONE PLATES.

APPLICATION I'ILED H0115 I909.

Patented Aug. 13, 1912.

2 SHEET8-SHEET 2.

Witnesses UNITED @FIEICE FRIEDRICH FLORSTEDT, OF BERLIN, GERMANY, AS$IGNOR TO THE FIRM OF SCHLEIF- MASCHINEN VERWERTUNGS GESELLSCHAFT M. B. ii, 01? BERLIN-WILMERSDORF,

GERMANY.

Srceifieaticn of Letters Patent.

Patented Aug. 13,1912.

Application filed November 15, 1909. Serial No. 528,051.

To all whom it may concern Be it known that I, Fnnanncn l Lons'rnn'r, a subject of the German Emperor, and resident of llerlin, Germany, have invented certain new and useful improvements in Devices for Grindingiu'titiciah tone llat-es, of which the following is a specification.

This invention relates to a device primarily designed for grinding art-iticial stone plates.

Appa 'atuses for the grinding 0t artificial stones have been hereto tore devised, but this invention is tor a new device tor grinding artificial stones upon each other.

lintil now and even up to the latest times, large steel grinding disks have been employed, which rotating at about (it) turns a, minute caused the objects to be ground and which were held in a suitable manner, to rotate in an irregular manner. This method has two dravi'hacks: In the first place the steel grinding disks wear and require to he turned again on the lathe and in the second place the waste or dust produced by the centrit'ngal action of the relatively hard steely grinding disks, is so great. that it becomes in 'uri0us to the person operating the grinding machine.

Now, the present invention relates to a device for grinding plates made ot natural or artificial stone (artificial granite, terrazzo) as well as of other grindablc materials by rubbing upon each other two of said plates to be worked so that both are ground. at the same time, work piece and tool. The upper plate receives to this etl'ect advantageously a reciprocating motion. The lower plate can besides be arranged in a receptacle intended to receive the grinding means (sand and water). and be rotated at the same time as said receptacle.

The accompauyin; d 'awings given by way of example show one form ot embodiment oi the invention and in these drawings: Figure l is a side view ot' the rinding machine. Fig. 2 is the top plan view oil the same and Fig. 3 shows again a side eleva tion of the machine but at 90" with ret'eronce to the view shown by Fig. 1.

In the drawings the main parts or members of the machine are designated in their order by the letters of the alphabet used as reference letters. v

The machine comprises a shaft 1) driven by the pulley asaid shaft is a bevel toothed wheel c and crank (it The first r0- tates, through the medium of a second bevel wheel a vertically arranged shaft 7' on which is keyed the working tub g. Secured to the bottom ol' said tuh are abutments lb l'orrnod of angle irons and intended to receive frames 1' which have the shape of the stone plate A: which they are intended to receive. The stone plate forms one of the work pieces.

The crank )rovided on shaft 1) causes, through the medium of a connecting rod 1, a lever II! to oscillate, which lever 711 has its fulcrum at n. The free end 0 ol the lover or is hingedly connected with the horizontally guided reciprocating rod s to which a t'ramc intended to receive the stone plate 2', is secured at the point 1). This stone plate 7' forms the second work piece. The reciprorati11g rod s is extended beyond 7) and its extension is guided by means of two tlat irons so as to avoid lateral deviations.

lv'hcn the shaft, I is rotated, the bevel wheel causes the tub g and, with it, the first stone plate h, to rotate while at the same time-tho second stone plate 1- receives a rectilinear recitnrocatiing; motion through the medium of the crank. (l, the connecting rod Z, the lever m and the reciprocating rod s. The mass contained in the tub and formed of grinding sand and water is raised by a stationary batllo plate or shovel o and is projected on or between the stone plates so that the desired grindingaction is obtained. in order to increase the pressure of the stone plate r on the stone plate Z: a weight n has been provided which is carried in an adjustable manner by the reciprotaiting rod s on which it; can be secured by means of screws.

\Vith my apparatus waste of the grinding sand is considerably reduced as the same sand can be used about six times and when it has been reduced too line it can be used in making mortar.

The batllc plate or shovel 4) has for its object to cause the grinding means to accun'uilate .in front. of it and to be thrown between the surface of the two stones to be ground. The battle-plate or shovel r is provided with an upstanding arm '11 which is slidably" mounted in a clamp o and secured by a screw 0 to permit the vertical adjustment of the shovel. it may be added that the base frame work of the machine which in the drawing has been shown as being com-.

posed of angle iron and sheet metal, can also be made of cast iron.

It is needless to say that the above described device is mainly employed for artificial stone plates, but that there is nothing which would prevent its application to natural stone plates.

I claim:

1. A device of the character described, comprising a rotary receptacle provided with a holding member upstanding from the inner surface of its bottom, a lower grinding member received by said holding mem be r, a horizontally reciprocating frame arranged above and out of contact with said holding member, and an upper grinding member received by said reciprocating frame, and means for actuating said rotary receptacle and said grinding members including intergeared beveled wheels, the shaft of one wheel carrying said rotary receptacle, a shaft of the other wheel being provided with a crank, a centrally pivoted lever, a link-connection between said crank and said lever, a reciprocating rod also con-' nected to said lever and pivoted to said 11pper grinding member holding frame, and a guide receiving between its members said reciprocating rod," the last named being weighted intermediate of said lever and the point of connection therebetween'and said holding frame.

2. In a machine for grinding artificial stone plates the combination with the framework of a tub adapted to receive the grinding material and one of the two stone plates to be ground, means for rotating the said tub and first stone plate, means for applying the second stone plate on the first one and for reciprocatin' it, a stationary shovel projecting in said tu and adapted to gather the said grinding mate-rial and to project it on the surface to be ground, and means for adjusting the said shovel vertically, substantially as and for the purpose set forth.

3. In a machine for grinding stones, a rotatable tub adapted to receive a grinding medium, means for rotating said tub, means for supporting a stone in: said tub, the said stone adapted to rotate with said tub, a reciprocating carriage adapted to maintain a second stone above and in pontact with said first mentioned stone, and an. adjustable bafiie plate comprising a curved blade adapted to deliver the said grinding me 'dium onto the surface of the rotating grind ing stone.

y In testimony whereof I have hereunto set my hand in presence of two witnesses.

' FRIEDRICH FLORSTEDT.

Witnesses WOLDEMAR H UPT, HENRY HAsPER.

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