US964000A - Grinding-roll. - Google Patents

Description

J. DBELEN.

GRINDING ROLL.

APPLICATION FILED APR. 5,1909.

Patented July 12,1910;

, Inventor Jan Deelen Hhin sea.

' JAN DEELEN, or nnnzn, NErnEaLAnns.

GRINDING-ROLL.

Specification 0t lletters ratent. Patented J l lly 12, 1910.

Application filed April 5, 1908. Serial No. 488,023.

To all whom it may concern:

Be it known that I, J AN DEELEN, a subject of the Queen of the Netherlands, and resident of Heeze, in the Province of North Brabant, Netherlands, have invented a new and useful Grinding-Roll, of which the following is a specification,

This invention relates to improvements in rinding and bruising rollers, made of artihcial .stone.

Objects of the invention are'to manufacture a roller, wherein grinding material of high degree of hardness .is mixed with some material which is less hard, so that the brittleness of the finished roller is considerably reduced in view of the rollers now in exist- GIICB.

Another object is to manufacture a roller wherein the grinding material and materia which binds the grinding material together are applied to a core, and said core 15 ar-. ranged so thatthrough its shape alone it is adapted to improve the connection between the particles of the entire mass.

Another object is to manufacture a roller which is provided with a plurality of recesses or channels, resembling the rollers made of steel or other metal and to fill these channels with a material of low degrees of hardness. The advantage of this construction rests in the fact that the slight depth of these channels can be very easily regained, after the outer and harder circumference of the roller is worn off. v p

In the accompanying drawing z-Figure 1, is an illustration of the various elements constituting the mass of the stone. .Fig. 2

is a front elevation of a pair of rollers. Fig: I

3, is a side elevation bf the pair of rollers. Fig. 4, is a sectional view of one roller. Fig. 5, is a section on line CD of Fig. 4.

The mass of the artificial stone is composed of minerals ofat least three different degrees of hardness. By way of example two minerals of a difierent degree of hard.-

ness with respect to each other are mixed together in crushed condition, and the size of the single particles may be chosen so, as it seems of advanta e for the purpose'for which the roller is to e used. Such minerals preferably are quartz, bauxites, waste marble or waste fire-stone. To this mixture a mineral in crushed bondition of a less degree of hardness than the aforementioned minerals is added, said last named mineral serving as a bindlng means for the entire mass.

-Magnesite or chlorid of magnesium may thus be used as the mineral of the lowest de ree of hardness.

n the known grinding and bruising rollers made of artificial stone, the very hard mass of stones was combined with some very soft mineral, said last named mineral forming the binding means. The disadvantage of this composltion was that the wear and tear mainly affected the binding means, so that the grain of the roller after some use lost its uniformity which the roller had originally. By adding at least one mineral of an intermediate degree of hardness between the hardest and the softest minerals, and the wear and tear of the stone are made uniform over the entire circumference and through the entire mass of the roller.

the grain is preserved" and changed the porosity The manufacturing process of the grinding or bruising roller according to this invention is about the following:

In Fig. 1 the particles indicated with 1, designate the material of the highest degree of hardness, the particles indicated with 3, designate the material which forms the binding means and the particles indicated with 2, designate the material which is combined with the hardest mineral and with the binding means. By adding water or some other suitable liquid, the entire mass is rendered plastic. For the purpose of securing the mass intimately to the shaft 10, a core 4 preferably of cast iron is supported on the shaft 10 and held in its place b means of the key 11. The core 4 advisa ly is of a cross section which forms a number of projections; as indicated in Fig. 5, the core is of a star-shape cross section, so that the mass may be disposed in the interspaces between the projections of this core. Furthermore, it is advisable'to surround the core 4 by a metal cylinder 6 made of perforated or corrugated sheet metal which may be reinforced by a number of ribs 7. In Fig.

. 5, the diameter of the metal cylinder 1s desi nated with a: while the diameter of the finished roller is indicated with y. The mass in its plastic state is filled in between the cylinder and the intersoaces between the promotions of the core and the balance of the plastic mass is then molded in its final sha e. The lateral faces of the roller. advisa b'ly are protected by the covers 12 which are fastened to the core by means of bolts 13.

As indicated in Figs. 2 and 5, the rollers may be provided with preferably helical flutes 9, which are filled almost in their entire depth with the material of the lowest de e of hardness, leaving a pluralit of h ical notches on the circumference o the roller. When the hardened circumference of the roller is then used up until the outer diameter of theroller is in onesmooth surface with the binding material 8 in the notches, then'these notches may be re aired again by again a circumference provided with helical grooves.

I claim:

A rinding and bruising roller of the class descr1bed,- comprising in combination, a metal core of star-shaped cross-sections, a

moving the'binding materia to a certain depth and the rollers then present cylindrical mantle inclosing said core, a rollmg layer consisting of a solidified'mixture of m1nerals of different degrees of hardness, sa1d mixture bein disposed in the interspace between, sais core and said mantle and mclosm said mantle, and said la er being provl ed with a plurality of helical grooves on its circumferential surface, said rooves being filled with the mineral of the owest degree of hardness, a superficial marportion of said grooves being left une In witness whereof I have hereunto set my hand in the presence of two witnesses.

JAN DEELEN. Witnesses:

W. H. Alums, 'W. A: MANIOE.

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