US2293216A - Grinder - Google Patents

Description

Aug. 18, 1942. .1. w. IRESIDE 2,293,216

GRINDER Filed July 14, 1941 I INVENTOR JAMES WRESIDE ATTORNEYS Patented Aug 18, 1942 UNITED STATES PATENT OFFICE GRINDER James W. Reside, Racine, Wis.

Application July 14, 1941, Serial No. 402,328

1-Claim.

This invention appertains to grinders, and more particularly to a novel machine for finishing the inner edges of fiat annular plates,

In the manufacture of said rings for corn planters, it is customary to, first, cast the rings, and, then, to polish or finish off the rough edges of the rings. The peripheries of the rings can be quickly ground off with the use of a conventional grinding wheel. However, in view of the radial lugs on the inner edges of the rings, it has been necessary for the workmen to employ hand files to finish off the inner edges of the rings. This is a laborious and time-consuming operation.

Therefore, one of the primary objects of my invention is to provide a specially designed grinding machin which will quickly and effectively finish the inner edges of the rings and the radial lugs without undue effort or the expenditure of a large amount of time on the part of the operator.

Another salient object of my invention is to provide a grinding machine for finishing off the inner edges of said rings, which embodies 'a table for removably receiving the rings and a rotary grindstone extending through the table and rings for effectively engaging the inner surfaces of the rings.

A further object of my invention is to provide novel means for adjusting the table and grindstone or other abrasive wheel relative to one another, whereby to permit the expeditious finishing of inner edges of rings of different characters.

A further important object of my invention is to provide a grindstone or other abrasive wheel of a special character and type, so that the corners of the radial lugs can be .quickly and expeditiously ground.

A still further object of my invention is to provide a grinding machine for finishing off the inner edges of the seed plates of corn planters, which will be durable and efficient in use, one that will be simple and easy to manufacture, and one which can be placed upon the market at a reasonable cost.

With these and other objects in view, the invention consists in the novel construction, arrangement, and formation ofparts, as will be hereinafter more specifically described, claimed,

and illustrated in the accompanying drawing, in

which drawing:

Figure 1 is a top plan view of my novel ma chine, with parts thereof broken away and in section to illustrate structural detail.

Figure 2 is a longitudinal sectional view through the machine, taken on the line 2-2 of Figure I, looking in the direction of the arrows.

Figure 3 is an enlarged, fragmentary, plan view of a seed ring of a corn planter, showing th unfinished inner edge thereof.

Figure 4 is a view similar to Figure 3, showing the inner edge of the ring and a radial lug being finished by the novel grindstone or other abrasive wheel.

Referring to the drawing in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter M generally indicates my novel grinding machine, and the same includes a base plate 5, which is adapted to be placed on and secured to a work bench or the like. This base plate 5 has connected therewith upstanding standards 6, to the upper ends of which are firmly secured the work table I for the seed rings R which are to be finished. The center part of the table has formed therein an opening 8 through which projects the bearings 9 for the shaft ll) of a grindstone or other abrasive wheel H. The bearings 9 are carried by the upper ends of pillar posts I2, and these posts can be firmly secured to the base plate 5. From the description so far, it can be seen that the grindstone ll projects through the center part of the table.

Fastened to the shaft [0 is a pulley wheel l3, and this pulley wheel is adapted to be driven by a belt M. The belt M can be driven from a line shaft or from an electric motor l5, which can be secured to the base plate 5.

In accordance with my invention, the abrasive wheel or grindstone H is of a special construction, and by referring to Figures 1 and 4, it will be noted that the periphery thereof is beveled or inclined, as at IS.

The seed rings R. are of the usual construction and will not be described in detail, but it is to be noted that each ring includes a fiat annular body I! having inwardly projecting lugs [8. During the casting of the rings R, rough edges are formed on the rings, and it is necessary to finish ofi or polish these rough edges. In Figure 3, I have shown the seed ring R with a rough inner edge l9, and it will also be noted that the edges of the lugs are also cast with a rough edge.

In use of my machine, the outer edges of the rings are first finished in any preferred way, and the rings are then placed on the work table I in such a manner that the abrasive wheel II will project through the ring.

Upon the driving of the abrasive wheel, the ring is brought into engagement with the periphery of the wheel, and the ring is slowly turned by the operator until the rough edges are finished 01f. Due to the shape of the periphery of the wheel, the inner edge of the seed rings can be accurately ground.

By referring to Figures 1 and 4, it can be seen that the abrasive wheel is of such a shape as to permit the quick and efficient grinding of the corners of the lugs where the lugs merge with the body of the ring. Thus, one side face of the abrasive wheel is utilized for finishing a side edge of the lug, while the periphery of the wheel issimultaneously used for finishing the inner surface of the ring adjacent the lug.

With my machine, the inner edgesrof the rin s can be quickly and accurately finished without undue eifort on the part of the operator.

It is desirable to provide means for adjusting the table and abrasive Wheel relative toone another, so that the centerof the shaft Ill-and the wheel can be adjusted relative to the top of the et While the grindstone itself can be raised or lowered, in the drawing I have shown the table 1 adjusted. To accomplish this, the standards 6 can be made in two telescoping parts 2| and 22. A winged nut and bolt 23 can be utilized for each standard to hold the parts thereof in a selected adjusted position.

Changes in details may be made without departing from the spirit or the scope of my invention, but what I claim as new is:

A grinding machine for finishing off the inner edges of annular plates comprising, a base plate, a work table having a central opening disposed above the base plate, adjustable standards connecting the table to the base plate, bearing pedestals secured to the base plate and projecting through the opening in the table, a horizontal shaft rotatably carried by the upper ends of the pedestals, an 'abrasive wheel mounted on the shaft for rotation therewith, said abrasive Wheel projecting through the opening in the table, whereby annular plates can be placedon the table over the wheel, and means for rotating the shaft.

JAMES W. RESIDE.

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