US 1520766 A
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G. W. CAKES PLATE GLASS POLISHING MACHINE Original Fiied May 21, 1921 PHUTO-UIHO b SACKETT & V/ILHELMS CORP N)!v Patented Dec. 30, 1924.
. 12 and 13. V with a plurality of polishing discs 14, felt' UNITED STATES I 1,520,765 PATENT OFFICE;
GEORGE W. CAKES, OF CRYSTAL CITY, MISSOURI, ASSIG NOR 'I'O PITTSBURGH PLATE GLASS COMPANY, A CORPOR-ATION OF PENNSYLVANIA.
App1ication,filed May 21, 1921, Serial No. 471,340. Renewed November 1 5, 1924.
To all whom it may concern:
Be it known that I, GEORGE 1V. OAKES, a citizen of the United States, and a resident of Crystal City, in the county of Jefferson and State of Missouri, have made a new and useful invention in Improvements in Plate- Glass-Polishing h'lachines, of which the following is a specification.
The invention relates to plate glass polishing machines of the rotary type in which the table carrying the glass is rotated, and the runners, provided with the felt polishing discs, rest upon the glass and are rotated by reason of their frictional contact with the glass. The invention has for its principal object the provision of animproved construction wherein a more uniform polishing of the glass on the table is secured and wherein the edgeportio-n. which is often under polished in the ordinary machine, is given a better finish. One embodiment of the invention is illustrated in the accompanying drawings, wherein:
Figure 1 is a plan view'of the apparatus shown in somewhat diagrammatic form, and Fig. 2 is a side elevation also somewhat diagran'nnatic in form for clearness of illustration.
Referring to the drawings, 1 is the table on which theglass is secured. which table is mounted for revolution with its axle 2 (Fig. and driven by any suitable means, such as the bevel gears 3 and t. Mounted above. the table in the usual framework 5 of channel bars are the runners 6, 7, 8 and 9, such runners each comprising a cast iron framework mounted upon the axles 10. 11, These runners are eachprovided covered on the lower side and provided with spindles extending up through the body portions of the runners. These runners are ordinarily made of different sizes, as. indicated in Fig. 1, and are rotated byreason of the frictional contact of the felt discs with the glass upon the rotating table. 7 The rotation of the table has a tendency to move the outer halves of the runners in one direction and the inner halves in the other, but sincethe turning effect upon the outer halves of the runners is greater, due to the gre er speed of the outer portion of the table as compared with its inner portion, the, runners are rotated in the same direction as the table itself. Suitable means are provided in a kuownin the'art and do not require description.
The construction as so far described is old and well known in the art and the applicant's invention consists in the use of supplemental runnersyin the present instance two in number, such runners being designated in the drawings with the nun'ierals 14 and 15. These runners are similar in general construction to the runners heretofore described except in the matter of size. They are each provided with a plurality of felt faced discs 16, similar to the discs let, and the two runners are mounted on axles 17 and 18 mounted to rotate in the, framework 5. These runners are power driven, however, in that pulleys IQ-and 20 are provided at the upper ends of the shafts and connectei by means of belts 21 and2'2 wi'l h other pulleys 23 and 24 mounted upon the upper ends of the shafts -10 and 12. Due to the smallsize of the runners, they will not rotate themselves by reason of the contact of the discs with the glass, so that this driving arrangement is necessary in order to secure the desired polishing effect. The advantage resulting from the use of these supplemental or auxiliary runners is that a better polishing elt'ect issecured upon that portion of the glass at the periphery of the table. It has been found that with a polishing machine such as that illustrated in Fig. land employing two or more self drive-n runners, there is a tendency of the glass to be under polished on the outer portions of the table, and these auxiliary runners supply the hecessary additional polishing effect. The driv- 1ng of these small runners from the large runners 6 and 8 is a matter of convenience and also adds to a certain extent to the efficiency of the large runners since it tends to slowdown their movement of rotation and thus increases the frictional effect between the discs of these runners and the glass upon the table. The invention is not, however, limited to the driving of the small runners from the large ones and is not limited to the use oftwo auxiliary drixen small runners or to the use of auxiliary driven small runners in connection with a four runner polisher of the type illustrated in Fig. 1, as the smaller driven runners might be used to advantage in connection with a polishing table earryii'ig less than four selt driven runners. At the present time, however, the table employing i'our sel't driven polishing runners is regarded as the best practice, and on such a tahle the best results are secured by using two small driven rui'mers so that the construction just as illustrated and described shows the best method of earryingout the invention.
What l rlaim is:
1. Vin cmnbination in a plate glass polishingmachine, a circular driven table adapted to carry the glass, a pair of circular polishing runners whose combined dian'ieters ap proximate that of the table mounted above the table with their polishing surfaces in opposition to the surface of the table and adapted to rest upon the glass on the table and be rotated by their frictional contact therewith, a pair of smaller polishing runners limited with their axes of rotation adjacent the'e'dge of the table, and means tor-rotating the smaller runners-from the larger ones.
2. In eonibinat-ii'in in a plate. glass polishing machine. a circular driven table adapted to carry the glass, a plurality of circular polishing runners of relatively large diameter mounted above the table with their polishing surf-aces in opposition to the surface of the table and adapted to rest upon the glass on the table and be rotated by their frictional eontact therewith and together covering the major portion of the table, a plurality of smaller runners located with their axes. of rotation adjacent the edges of the table. and-means for driving the smaller runners from the larger ones.
In testimony whereof, I have hereunto subscribed my. name this 17th day of May.
GEORGE \V. CAKES;