US805176A - Grinding-plate. - Google Patents

Description

No. 805,176. PATENTED NOV. 21, 1905. J. F. WINGHELL, DEGD. L. L. w IIIIIIIIIIIIIIIIIIIII x. GRINDING PLATE. AAAAAAAAAAAAAAAAAAAAAAAAAA 2.

No. 805,176. PATENTED NOV. 21, 1905.

J. F. WINGHELL, DECD.

L. L. WINCHELL, ADMINISTRATRIX.

GRINDING PLATE.

APPLICATION FILED JAN. 27, 1902.

3 SHEETS-SHEET 2.

Wzmes s e s law/liar 4' e/AQLM f M flttorney No. 805,176. PATENTED NOV. 21, 1905. J. F. WINCHELL, DEGD.

L. L. WINGHELL, ADMINISTRATRIX.

GRINDING PLATE. APPLIOATION FILED 5,111.27. 1902.

3 SHEETS-SHEET 3 Wzfiwsses lime/270i Him/"120 y UNITED STATES PATENT OFFICE.

JAMES F. WINCHELL, OF SPRINGFIELD, OHIO; LIDA L. VVINCHELL, ADMINISTRATRIX OF SAID JAMES F. WINCHELL, DECEASED, ASSIGNOR TO CHARLES E. PEASE AND VILLIAM B. ANDERSON,

OF DAYTON, OHIO.

GRINDING-PLATE.

T0 (0% whom it may concern:

Be itknown that 1, JAMES F. WINcHnLL, a citizen of the United States, and a resident of Springfield, county of Clarke, and State of Ohio, have invented a certain new and useful Improvement in Grinding-Plates, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to grinding-plates especially adapted for use in-attrition-mills in which it is customary to employ a pair of plates each revolving at a high rate of speed in opposite direction. The corn, wheat, or material fed into the mill and which is to be operated upon by the frictional or rubbing contact of the various particles with each other is held by the faces of the plates by reason of their peculiar construction, and the material is thus reduced to meal or pulverized to the desired state, this being regulated by the adjustment of the plates closer to or farther from each other.

My invention will be more fully hereinafter described, and illustratedin the drawings, in which Figure 1 is a plan view of one of the grinding-plates constructed in my improved manner, and Fig. 2 is a plan view of the other or adjacent plate constructed in a similar manner and the position of the circumferential ridges of the other plate shown in dotted lines. Fig. 3 is a vertical section of the grinding-plates and head-plates to which the grinding-plates are secured and the head-plates mounted on the revoluble shafts. Fig. 4 is a plan of a portion of a grinding-plate, showing a modified construction.

Like letters of reference indicate identical parts in the various figures.

The grinding-plates, which are generally made in sections a a, are securely fastened in any convenient manner to head-plates or disks A, which are keyed to revoluble shafts A, the two disks A, to which the grinding-plates are secured, being keyed to separate shafts which revolve in opposite directions. The friction and wear on the grinding-plates being quite severe, it is necessary to construct them of hard metal.

The grain or other substance to be operated Specification of Letters Patent.

Application filed January 2'7, 1902. Serial No. 91,405.

Patented Nov. 21, 1905.

upon is fed into the space intermediate the plates from the center, one of the disks A being provided with an opening at or near its center and which has communication with a hopper into which the material is fed. The material being fed in near the center, the centrifugal force of the revolving disks with their grinding-plates tends to throw the material out from the eye of the plates to the periphery. By reason of the construction of the grinding-plates the centrifugal movement of the material is temporarily arrested by the circumferential rings, and the particles are thus temporarily held and forced to act upon themselves. The plates being revolved of course also tend to give the material a revolving motion, which is in turn partially arrested by the radially-extending ribs or walls, and this constant action of the grain or material upon itself results in a powdering of the various particles.

As shown in the drawings, and especially illustrated in Figs. 1 and 2, the inner portion of the plates are not provided with the circumferential ridges or ribs of the outer portion, and the plates are also slightly tapered 0r sloped toward the eye or draft circle, thus more readily permitting the substance to enter between the plates and find temporary lodgment in the various rectangular pockets or depressions, from which it is forced by the rapid revolution of the plates.

When the head-plates or disks with their respective grinding-plates are rotated in opposite directions, two powerful forces are at work on the material introduced, one a rotative force and the other a centrifugal force. The grinding-plates being provided with radially-extending and circumferential ridges have thus formed in their adjacent faces pockets in which the material finds lodgment. The centrifugal force causes the material to endeavor to pass in a radial line from the eye to the periphery. The rotative force causes the material in these pockets to endeavor to travel in a circular direction with the plate in whose pocket it has found lodgment. The combined effect of these forces causes the material in one of the pockets to impinge forcibly against the radially-extending rib and also the circumferential ring.

With the plates as heretofore constructed, in which the circumferential ridges or walls form circular lines, the material in the pocket will be held at a point in proximity to where the circular wall and radially-extending wall meet and with the combined action of the r0- tative and centrifugal forces exerted on the material cause the material to be forced at the corner of the rectangular pockets. The rotative force being more powerful than the centrifugal, a portion of the material will be carried across the face of the radial rib at the corner and ultimately wear down or round off the edge of the radial rib. This wearing away of the rib at this point of course resulted in a reduced capacity of the mill, because of its permitting more of the material to travel around with the disks or head-plates and their respective grinding-plates instead of being moved out by the centrifugal forces. This also resulted in a constantlyinferior quality of the product, and it necessitated an increased consumption of power. My invention consists in providing the surfaces or operating-faces of the plates with a series of ridges 0r ribs 5, extending circumferentially, and radially-extending ridges or ribscto form numerous depressions or pockets (Z, whose distances from the center of the plate vary. It will be seen that the ridges or ribs 6, producing circuitous lines or eccentric circles which constantly vary in the distance from the center, and the point of impingement of the material on the rib instead of being maintained at a fixed point, as above described was the case with grinding-plates as heretofore constructed, it moves outward and inward as the varying distance of the ring approaches nearer to and recedes farther from the center, and the concentration of the material is not constantly maintained at one and the same point on the radially extending ribs, but is compelled and permitted to move outward or inward by reason of the eccentricity or constantly varying of the walls or ribs b, thus enhancing the life and effectiveness of the grinding-plates and also securing the service of a greater part if not the entire length of the radially-extending ribs before the grinding edges are worn down or rounded off, as was not the case with the constructions heretofore in use wherein the radially-extending ridges or ribs were worn off at one and the same point, thus making the plates defective long before the remaining portion of the radially-extending ribs had become worn. In Figs. 1 and 2 I show each dam or rib 6 independent of and at a different distance relative to the center of the combined or assen1- bled plate from the next adjacent dam or rib, thus producing a broken or irregular line. The plates have their dressed or working faces placed adjacent or facing each other and are practically similar, with the exception that the one (see Fig. 2) is provided with more circumferential ridges or ribs, thus forming an additional circuitous line. It will be seen that the variability of the circuitous line formed by the circumferential ribs 6 practically does or may equal the distance between the circuitous lines 6 Z) on the other plate, thus utilizing the entire grinding-surface of the plates. It will thus be apparent that with my improved construction the life or period of usefulness of the plates is greatly enhanced, as the entire grinding-surfaces of the plate are brought into play, whereas in the former constructions the groove formed in the grinding ridges or surface by reason of the impingement of the material at one and the same point would make the plate useless long before the major portions of its surface had become worn.

in Fig. 4 I have illustrated a modified construction of the grinding-surface, in which the circumferential ridges or ribs 6, forming eccentric lines about the face of the plate, and the eccentricity or deviation of a ridge on the one plate may coincide with the space between the circumferential ridges on the other or adjacent plate.

The advantages and results of my construction as heretofore described are also obtained by the employment of plates having grindingsurfaces formed as just stated, and illustrated in said Fig. 4.

It is apparent that the constructions shown and described in the drawings and specifications may be slightly modified without departing from the spirit of my invention, and I do not wish to limit myself to theexact constructions shown and described; but

hat I claim as my invention, and wish to secure by Letters Patent, is-

1. Agrinding-plate for mills provided with radially-extending ridges or ribs and a series of circumferential ribs forming undulatory lines about the faces of the plate, substantially as and for the purpose specified 2. Grinding-plates for mills having radiallyextending ridges or ribs, and a series of cir cumferential ribs extending in undulatory lines about the faces of the plates, the circumferential ribs intersecting the radial ribs to form pockets whose respective centers vary in their distance from the center of the plates, substantially as shown and for the purpose specified.

3. A grinding-plate provided with radial and circumferential ridges or ribs, the circumferential ridges intersecting the radial ridges and forming pockets in the faces of the plates, substantially every part of the circumferential ridges or ribs intermediate of adjacent radial ridges, varying from the adjoining part in the distance from the center of the plate, substantially as shown and described.

4. A grinding-plate for mills provided with radial and circumferential ridges or ribs, the circumferential ridges intersecting the radial ribs or ridges and forming pockets, substantial-ly every one of which varies in its distance from the center of said plate, substantially as shown and for the purpose described.

5. Grinding-plates with radial and circumferential ridges or ribs, the circumferential ridges intersecting the radial ridges and forming pockets, the respective centers of substantially every pocket being at difi'erent distances from the center of the plates, substantially as shown and described.

6. A set of sectoral grinding-plates, provided with radial and circumferential ridges or ribs, the circumferential ridges forming undulatory lines about the faces of said plates, each circumferential ridge intersecting the radial ridges at different distances from the center of the plates to form pockets, the Whole being so arranged that the undulations in one circumferential ridge shall traverse the space intermediate of the circumferential ridges on the opposite plate, substantially as described and for the purpose specified. 7 A set of grinding-plates for mills, eacl provided With radial and circumferential ridges or ribs, the circumferential ridges intersecting the radial ridges or ribs and forming pockets in the faces of the plates, the circumferential ridges being so arranged as to form undulatory lines about the faces of the plates, the undulations in said circumferential ridges being of a degree substantially equal to the length of the corresponding pockets on the adjacent plate, substantially in the manner and for the purpose described.

- JAMES F. WINCHELL. Witnesses:

GEORGE HEIDMAN, EDW. HAAT.

Images