US881621A - Abrasive tool and mounting. - Google Patents

Description

No. 881,621 'PATENTED MAR. 10, 1908. 'R. A. ROWLAND & w. J. MAHNKELI ABRASIVE T601, AND MOUNTING.

APPLICATION FILED km. @1907;

anuenfozd an Abrasive Tool and ROBERT A. ltU\\'liANl) AND WILLIAM J. MAllNliE, OF-(JLEVELA N1), oiiio'.

ABRASIVE TOOL AND MOUNTING.-

No. 881,621. Specification of Letters Patent. 7 Application filed February 25,1907.

Patented. March 10, 1908 Serial No. 359,087.

To all whom it may concern:

Be it known that we, Ronaar A. ROWLAND and WiLLIAM J. MAiiNnic, citizens of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have inventei'l a new and useful .linprovmnent in Mountii'ig, of which the following is a specification.

This invention relates to an abrasive tool intended for dressing and smoothing marble, granite and other blocks of stone.

The object of the invention is to distribute the abrasive liizttfllitlili such a manner that. it Will perform the greatest amount of work in a given time. This result is accomplished in two ways, first, by formin the abrasive tool in such a manner that t 1e material of which it is composed is so arranged or dis tributed that there will be an even wear of the under face of the tool, and'secondly, by so constructing the abrasive tool that a supply of water can be fed. continuously to all parts of it, thus keeping the'wearing face of the tool cooled, and at the same time removing the waste material ground from the stone. Unless the waste material formed by the grinding away of the portions of stone and also of the grinding surface of'the tool, it becomes guminy and interposes a layer of Waste between the surface of the tool, and the unground surface of e stone, thusinterfering with the cutting a ction of the abrasive material and increasing the amount of time required to grind to the required extent.

Other objects of the invention is, to provide a holder for the abrasive material from which the material may be easily removed, and provide means for quickly attaching said older to a rotating shaft, and also to provide means for adjusting the holder and material with respect to the shaft and the stone as either the stone or the material wears away.

In the drawings forming a part of this specificati0n: igure It is a )erspective View of our abrading tool and nolder connected to the end portion of a shaft. Fig. 2 is an inverted plan view of the abrading tooi and the holder. Fig. 3 is a section on the line 33 of Fig. 2. Fig. t is a section on the line 4-4 of Fig. 2.

In these drawings A represents the abrading instrument and this ma any grinding com osition w necessary or desire le to use, and

'ch it may be which can be formed of i the core A greater wear upon evenly and the be changed to suit various kinds of stone. T his abradingtool is formed by molding and is octagonal in shape. The abrading tooliis hollow and is provided"Withan interior web i consisting'of a central .ct' re A souared in cross-section au daiso hollow andv tie core is connected to the sides by radially ext'eni'ling: arms A." which extends from the corners to tlie'sii'les of the tool. This. construction is very clearly she I: in .5 it willfurthermore, be noted that the periphher than the oral walls of the tool are thie walls of the core A and that the arm A which. practically forms divisional o1 partition walls, since theyilividc the interior of the tool into four compartments, gradually decrease in thickness as they ap 'iroaeh the core A. i

The object of this construction is to secure an even wear-of the grinding face of the tool, for it will be obvious that as the tool is rotated the peripheral wall will travel at a greater speed than thc central core portion and the outer portions of the armswill also have a higher velocity than theinner portionsand consequently there will be a the portions of the tool most distant from the center than upon that portion of thc'grinding surface adjacent the center. It will therefore be obvious that if the abrasive tool was solid it would not only be much heavier but it would also wear ran-- "lll'lillng action, therefore, would not be unilorm over all portions of the stone being operated upon at the sometime. 'ihcrel'orc, as only portions of the surface of the stone beneath the grinding tool were being acted upon at a time, that is, that part of the surface iiimicdiatcly in contact with an. unworii portion of the abrasive tool, a longer time would be required to grind it cerlain amount of waste material from the stone. As the grinding action is also dependent upon the prompt removal of waste material, so that tic abrasive tool l'inuously present a clean face; lo the stone it IHFPS-stti) to supply water to all parts oi the grinding face. 1 i

The manner of supplying the. water to the tool is, of course immaterial but it is common. to play a hose upon the tool during the grinding operation. \Vith a tool constructed shown in our drawings, it will be obvious that the stream of water upon the tool ivili enter the interior compartments as the tool is ili coir- I parts of the grin mg surface we rovide both the peripheral wall, the walls the core A and the arms or partitions A with a plu-.

rality of small transverse perforations A so that water will pass freely and rapidly from one portion of the tool to the other, thus thoroughly cleaning and cooling all parts and 'removing ra idly all waste material. The removal of t is waste is also greatly facilitated by forming the tool hollow instead of making it solid, which would permit the collection of waste material under the tool by preventing an effective stream of water reac'hin the surfaces of the stone upon which the too was rotated.

. A metal holder B is cast in the same form as the abrasive material A and is provided with openings B, four in number correspond- I ing with the four compartments of the abrasufficient toi hold it in place during the grindparallel ears sive tool. The casting B is also provided witlra flange B, and molded abrasive tool is inserted within this flange which is normally ing action. In order, however, that there may be no-danger of the abrasive material falling from the holder, while being lifted into position upon the stone, we-form slots in the marginal ortions of the holder B and drive wedges into these slots, which wedges bear against sides of the abrasive tool and lock the sametightly in the holder B. Centrally u on the holder 3 we form ."l which are provided with a plurality of alining perforations D. The shaft E is rotated in any convenient manner and this shaft is provided at its lower end with ears E between which 1 are ivotally held a sleeve or coupling member J and a pin- E The pin E pa'sses through one set being transversel of alining perforations D". By changing the in from one set of perforations to the other, It will be obvious that the tool may be raised or lowered with reference to the stone.

The octagonal shape of the tool possesses advantages over a circular shape and especially in the two following partroularsz-An annular block will not slip in the holder as might be the case of one circular inform and held in a circular holder. In case the stone has ridges upon it, the angles of the face of the block aid in grinding away said ridges whereas a cylindrical block having a circular bottom or wearing surface would be likely to ride upon such ridges as the tool was moved while rotating back and forth upon the stone.

Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent, is

1. A grinding tool consisting of a rectangular hollow block of molded abrasive ma terial a central core therein, and radial arms connecting the central core and the sides of the block, said arms forming partitions dividing the interior of the block into com-- partments, said partitions and core being transversely perforated. A

2. A grindmg tool of the kind described consistin of a block of abrasive material oetagona in form and hollow, a web formed upon the interior of tho block and com rising a core and radial arms, said core an arms perforated, the sides of the block being 0 greater thickness than the walls of the core and the radial arms decreasing in thickness as they approach the core.

ROBT. A. ROWLAND. WILLIAM J. MAHNKE. Witnesses:

GEO. H. CAMP, (hIAnLEs S. WILMOT.

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