US 499714 A
Description (OCR text may contain errors)
' (No Model.) 2 Sheets-Sheet 1.
A. M. 003mm. GRINDING RING.
(No Model.) 2 Sheets-Sheet 2.
A. M. OORNING.
N0.-499,714. Patented June 20, 1893.
ARTHUR M. CORNIN G, OF BATAVIA, ASSIGNOR TO EDMUND S. I-IOWVLAND OF AURORA, ILLINOIS.
SPECIFICATION forming part of Letters Patent No. 499,714, dated June 20, 1893. Application filed February 15, 1892. Serial No. 421,604. (No model.)
To all whom it may concern:
Be it known that I, ARTHUR M. CORNING, a citizen of the United States, residing at Batavia, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in Grinding-Rings, which are fully set forth in the following specification, reference being bad to the accompanying drawings, in which- Figure 1, represents a plan view of a grinding ring embodying my invention; Fig. 2, a a section of the same taken on the line 22 of Fig. 1; Fig. 3, a detail section on the line 33 of Fig. 1; Fig. 4, a similar section on the line 4-4 of Fig. 1; Fig. 5, a similar section on the line 5-5 of Fig. 1, and Figs. 6 to'12, a series of graphic views illustrating the operation of a section of grinding rings embodying one of the principal features of my invention.
My invention relates to that class of grinding mills in which the grinding plates are in the form of an annulus and are generally known as grinding rings.
The invention consists in certain special features of construction in the dress of the rings, whereby I obtain important results, as will be hereinafter set forth.
I will now describe in detail the construction and operation of grinding rings in which I have embodied my invention in a practical way, and Will then point out more definitely in claims the particular improvements, which I believe to be new and desire to secure by Letters Patent.
In the drawings A, represents a metallic grinding ring of ordinary construction in its general features and having the usual cen- '--tral opening a, the inner edge of the ring around this opening having a general curve inward as is usual in this device. On the face of this ring a dress is provided as follows: First, there is a series of long drifts B, which extends entirely across the ring, but on secant lines. These drifts are arranged at equal distances apart and about midway between them is a second series of long drifts O, which are like the former, except that they do not extend inward quite so far, as seen in Fig. 1. The drifts B, extend across the full width of the ring and terminate in vertical ends, so as to make projections standing out squarely over the inner bevel of the ring. The drifts 0, do not extend inward quite so far and their inner ends terminate in an incline so that they form projections above said bevel, of considerably less prominence. A third series of drifts D, arranged about midway of the spaces between the drifts B and C, extend from the outer edge of the ring to the commencement of the bevel, and slightly over the latter, as seen in Fig. 1. In the spaces thus formed by the inter-position of the drift-s D, there is a. group of three drifts, the same in each, first, a central one E, extending from the outer edge of the ring to the bevel and secondly on each side of the latter a short low drift F, extending in from the outer edge of the ring only a little Way. The upright inner extremities of the longest drifts B, form gathering points I). At the back of the drifts these points present a nearly vertical face, but on the front or Working side there are two short steps or drifts G and H, the first next to the drift B, being a little lower than the latter and extending about over the entire length of the bevel, and the second being in front of the first, and still lower and extending over the bevel like the former, as seen in Figs. 1 and 5. The back of the projecting inner end of each drift 0, is nearly vertical, but in front or on the Working side of these drifts, there is a lower or second short low drift I, extending in from the commencement of the bevel to the inner extremity of each of said drifts. The upperedges or surfaces of the main drifts B, are slightly depressed centrally, so as to make this surface slightly concave, as seen at b in Fig. 2. The next shorter drifts, C are also constructed in the same way with aslight concavity in their upper edges or surfaces, as seen at c in Fig. 4.. The intermediate drifts D, are also provided at their inner ends with a short low drift d and the drifts E, with a similar drift 6, thus making these drifts double at their inner ends.
Now, it will be understood, of course, that these rings are used in pairs, face to face, both being dressed alike and sometimes one stationary and sometimes both revolving, but
of course in opposite directions. It will be seen then that with the double and triple drifts, provided as above described, the grain is not brought up against said faces at once, but against stepped surfaces, and the steps between these stepped surfaces will first be large and gradually decrease as one ring passes by the other. The effect of this, especially with the triple, drifts provided at the inner ends of the longest drifts on the rings, is graphically illustrated in Figs. 6 to 12, where the steps formed by the drifts are represented in cross sections. Now, suppose the lower piece K, to be be stationary, while the upper piece L, is moving in the direction of the arrow. The stepped openings and Z correspond to the surfaces made by the triple drifts. The change in the relative position of these parts and the shape and size of the opening between them will be seen at once from a study of these figures and their action upon the grain coming into these spaces will be obvious; the latter will be gradually crushed and finally reduced instead of the breaking and crushing action coming all at once. The grain is thus broken up almost immediately upon its entrance between the grinding rings and the subsequent reduction by the drifts farther out on the rings is facilitated. The depression in the upper edges or faces of the drifts mentioned above, also facilitate the proper reduction of the grain, for they permit a portion of the material to pass over to the spaces on the other side, instead of forcing the entire quantity along the one channel at the side of the drifts. This is especially so with the larger particles, which instead of following out along the main drifts will pass over and be further ground by the outer drifts in the next division.
I have found that these improvements in the dress of grinding rings are attended by remarkable results in practical operation; so far as known to me the best rings heretofore used will grind from fifty to fifty-five bushels I per hour; with my improvements the capacity of the rings is largely increased, in fact,
I will say almost doubled, for in actual practice I have ground from eighty to one hundred bushels per hour,.the rings being the same, with the exception of the difference in dress.
Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is
1. In grinding rings, the long drifts B, provided with gathering points 73, at their inner ends, in combination with the low, short drifts G. and H, one lower than the other and arranged at the inner end of the drifts B, on the working side thereof, substantially as described.
2. In grinding rings, the drifts O, extending at full height from the outer edge nearly to the inner edge of the ring and thence on an incline to said inner edge, in combination with a short low drift I, arranged at the inner end of the former and on the working side thereof, substantially as described.
3. In grinding rings, the long drifts B, provided with slight depressions b in their upper surfaces extending along the middle portions thereof, substantially as described.
4. In grinding rings, the drifts O, interposed between the main drifts and provided with slight depressions c, in their upper surfaces, extending along the middle portion thereof, substantially as described.
5. In grinding rings, the main drifts B, extending entirely across the rings and provided with gathering points I) at their inner ends, in combination with intermediate drifts G, extending from the outer edge of the ring to and partly over the curved inner edge, the low, short drifts Gand H arranged in front of the gathering points on the ribs B, and low drifts I, arranged in front of the inner ends of the drifts O, substantially as described.
6. In grinding rings, the main drifts B,provided with slight depressions b in their upper surfaces, in combination with the intermediate drifts O, provided with similar depressions c, and the short outer drifts E, and
F, arranged in the spaces between the drifts B, O, and D, substantially as described.
7. In grinding rings, a dress for the grinding surfaces consisting of the long main drifts B, provided with gathering points I), the shorter intermediate drifts 0, about midway between the former, the inner low, short supplementary drifts G and H, in front of the gathering points, the similar low drifts I, in front of the inner ends of the drifts O, the double drifts D, about midway between the ,drifts B and O, and the outer double drifts E, and the short drifts F, arranged in the spaces between the drifts B, (l, and D, substantially as described.
ARTHUR M. CORNING. WVitnesses:
A. M. Bnscr, H. D. I'IOLLISTER.