US1854508A - Grinding runner - Google Patents

Description

3 April 19, 1932. Q J DRAKE I 1,854,508

GRINDING RUNNER Filed June 27, 1929 2 Sheet-Sheet l April 19, 1932. J. 1.. DRAKE I GRINDING RUNNER Filed June 27, 1929 2 Sheets-Sheet 2 Patented Apr. 19, 19 32 JOHN L.

E, OF TOLEDO, OHIO, ASSIGNOB TO LIIBBEY-OWENS-FORD GLASS COM- orrica PANY, OF TOLECDO, OHIO, A CORPORATION OF OHIO GRINDING RUNNER Application filed June 27,

lhe present invention relates to apparatus designed for the surfacing of glass sheets or plates or other flat sheets of material and has for its principal object the provision of an improved form of grinding head or runner for use in the manufacture of plate lass.

Another object of the invention resi es in the rovision of a novel form of grinding head or runner of the above character comprising an annular plate, disc or wheelhavavoided, to the end that a more uniform finish over the glass may be had.

Other objects and advantages of the invention will become more apparent during the course of the following description when taken in connection with the accompanying drawings.

In the drawings forming a part of this application and wherein like numerals are employed to designate like parts throughout the same,

Fig. 1 is a bottom view of one form of grinding head or runner. provided by the present invention.

Fig. 2 is a transverse section of the grinding runner taken substantially on line 2-2 of Fig. 1 and showing the same in association with a glass supporting table. and

Figs. 3, 4 and 5 are views similar to Fig. 1, but showing modified arrangements of the grinding projections on the runners.

In the production of plate glass, a sheet of glass commonly termed a plate glass blank is ordinarily ground and polished on both sides thereof by subjecting it to the action of abrasive materials and a polishing me- 1929. Serial No. 374,029.

dium. It is quite common to use such abrasives as sand, garnet, emery or the like, the abrasive being ordinarily suspended in water to permit easy handling, etc. The grinding is accomplished by suitably supporting the 55 lass blank and creating relative movement etween said blank and a suitable surfacing member 'or tool which contacts therewith, means being provided for supplying the abrasive material between the sheet and sur- 00 facing member.

There are numerous methods of grinding and polishing plate glass, and this invention is not limited to any one particular system. However, by way of example, the invention 5 has been illustrated in Fig. 2 of the drawings in connection with the so-called continuous system wherein a sheet of glass 10 to be surfaced is suitabl supported upon a table 11 and adapted to he carried thereby successively beneath and in contact with a series of grinding and polishing members. The grindmg member provided'by the present invention may, however, be also used in connection with a rotary glass supporting table, if 7 desired.

The grinding head or runner herein provided is carried at the lower end of a vertical drive spindle 14 of the grinding machine and comprises a base plate, disc or so wheel 15 ordinarily formed from cast-iron or some other suitable metal. Formed integral with or removably carried by one face of the base plate are a plurality of spaced grinding lugs or projections 16.

In the form of the invention illustrated in Figs. 1 and 2, the grinding projections '16 are arranged in a plurality of annular rows A, B, C, etc., the several rows being concentric with respect to one another but not 0 concentric with the center of base plate 15.

On the other hand, the annular rows of grinding projections A, B, C, etc., are swung about the common axis indicated 17 which is off-set from the center of the disc and the axis of rotation thereof which is indicated 18 so that the annular rows of projections are arranged eccentric with respect to the axis of rotation of base plate15. Due to such an arrangement, upon rotation of the grinding runner in contact with the glass, there will be provided an eflicient break-up motion and scrubbing action which will greatly aid in and facilitate the grinding operation. Also, no one grinding projection will follow in exactly the same path traversed by the preceding projection so that each succeeding projection will swing in a slightly different orbit than the preceding projection and travel in a different path over the glass. As a result, a more uniform grinding action over the entire surface of the glass will be had and the tendency toward grooving of the sheet will be greatly minimized if not entirely eliminated. It will be readily apparent that when the grinding projections are arranged in a plurality of rows concentric with the axis of rotation of the disc, that all of the projections in any one row will follow in the same path over the glass and that there will be a tendency toward grooving of the sheet. However, with the present arrangement, this objectional feature Will be avoided. Further, it will be noted that no two of the grinding )rojections on the same side of the runner, as defined by a straight line designated 19, passing through the two centers 17 and 18 will travel in the same path or orbit.

The base plate or main castin 15 also carries an annular abrasive suppl y trough 20 provided at a plurality of points with openings which communicate with openings 21 extending through therunner so that the abrasive material will be discharged from trough 20 downwardly onto the glass within the cavity or opening 22 arranged inwardly of the innermost row of grinding projections A.

In Figs. 3, 4 and 5, different arrangements of the grinding projections are shown and by which the objects of the present invention may also be accomplished. In Fig. 3, the grinding projections 16 are arranged upon the annular base member 15 in a plurality of elliptical rows concentric with one another and also with respect to the center or axis of rotation of said runner. In Fig. 4 is shown an arrangement similar to that of Fig. 3 with the exception that while the elliptical rows of grinding projections are concentric with one another they are eccentric with respect to the axis of rotation of the disc as with the form of invention illustrated in Figs. 1 and 2. In Fig. 5 the base member 15 is elliptical instead of circular and the elliptical rows of grinding projections 16 are arranged symmetrical over the face thereof.

It is to be understood that the form of the invention herewith shown and described is to be taken as the preferred embodiment of the same, and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

I claim:

1. In surfacing apparatus, a rinding runner including a rotatable circu ar base member and a plurality of spaced grinding projections carried upon one face thereof, said projections being arranged upon the base member in a plurality of elliptical rows.

2. In surfacing apparatus, a rinding runner includin a rotatable circu Iar base member and a p urality of spaced grindin projections carried upon one face thereo said projections being arranged upon the base mem er in a plurality of elliptical rows eccentric with respect to the axis of rotation thereof.

Signed at Toledo, in the county of Lucas and State of Ohio, this 22nd day of June,

JOHN L. DRAKE.

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