US471345A - Grinding mill - Google Patents

Description

(No Model.)

D; C STOVER. 5`Sheets--Sheet 1.

No. 4711 345 @BINDING MILL.

- Patented Mar. 22 1892 IIIIIIIIIIIIIIIIIIIII||I||||||||||||||||||| 5 Sheets- Sheet 2. D. o. STOVER. GRINDING MILL.

(No Model.)

No. 471,345. Patented Mar. 22, 1892.

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(No Model.) 5 Sheets-Sheet 3.

D. C. STOVER. @BINDING MILL.-

'N0. 471,345. PatenteaMar. 22, 1892,.

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Patented Mar. 22, 1892. I

myllin (No Model.)

D. C. STOVER.

GRINDING MILL.

vplete mill embodying my invention.

. Nrrnn STATES FFICE.

2 ATnNr DANIEL C. STOVER, OF FREEPORT, ILLINOIS, ASSIGNOR TO THE STOVER MANUFACTURING COMPANY, OF SAME PLACE.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 471,345, dated March 22, 1892.

Application led May 14, 1891. Serial No. 392,655. (No model.)

To all whom t may concern.-

Beit known that I, DANIEL C. STOVER, a citizen of the United States of America, residing at Freeport, in the county of Stephenson and State of Illinois, have invented certain new and useful Improvements in Grinding-Mills, of which the following is a specification.

My invention relates t0 improvements in grinding-mills, and is fullydescribed and explained in this specification and shown in the accompanying drawings, in which- Figure l is a perspective View of a com- Fig. 2 is a transverse vertical section of the mill through the line 2 2, Fig. 1. Fig. 3 is a top plan of the hopper of the mill and the crushing mechanism located therein. Fig. 4f is a top plan of the base of the mill with the grinding and feeding mechanism in place therein, Fig. 5 is an edge view of the central burr of the grinding mechanism. Fig. 6 is a side elevation thereof, showing its connection with the parts by which it is rotated. Fig. 7 is an elevation of the lever, by means of which theposition of the grinding-burrs isregulated. Fig. 8 is a transverse section of the slide, by means of which the feed from the crushing mechanism to the grinding-chamber is regulated, together with the means for adjusting the same; and Fig. 9 is a central longitudinal vertical section of the grinding and feeding mechanism and the parts immediately connected therewith.

In the views, A is the bed or base of the mill, provided with legs a for its support and formed with a downwardly-extending `semicylindrical trough or depression A', which constitutes the lower half of the grindingchamber of the mill. Upon this base rests a hollow casting A2 having at its center an u D 3 C p wardly-convex semi-cylindrical chamber A2, corresponding in position with the trough A already referred to, and forming therewith the grinding-chamber. Circular openings in the ends of the grinding-chamber connect it with the spaces in the ends of the hollow casting A2 and permit the entrance of grain to the grinding-chamber.4 A spout a', fastened to the upper portion AS of the grindingchamber in the manner indicated in Fig. 2,

provides for the escape of meal from the grinding-chamber, and a hopper A4, resting upon the casting A2, is adapted to contain grain or other material which is to be crushed and ground in the mill. The hopper, the casting A2, and the base or bed are bound together by bolts in substantially the manner indicated in Fig. 1.

In the base A is journaled a longitudinal shaft B, projecting at both ends beyond the base, and a driving-pulley and fly-Wheel are mounted on the 'opposite ends of this shaft and serve as a means for operating the mill. A pinion o is rigidly mounted upon the shaft B and engages a gear-wheel o', mounted on a shaft B', which is journaled in the hopper A4 and extends longitudinally through it. (See Figs. l, 2, and 3.) A pinion b2, loosely mounted on the shaft B', engages a second pinion h3, mounted on a shaft B2, journaled in the hopper and parallel with the shaft B. The pinion b2 on the shaft B is provided vat its outer end with a hub C, formed with an arm c, lying in the plane of the gear-wheel b and of such length as to engage a wooden pin p, inserted in one of the spokes of the gearwheel in the manner indicated in Fig. 3. By means of this pin and arm the rotation of the main shaft and of the gear-wheel b is imparted to the pinions h2 b3 and all these parts rotated to- Y gether until the resistance to the operation of the mill is sufficient to break the pin p, in which case the pinions b2 b2 no longer rotate with the gear-wheel. Each of the pinions b2 b3 has on its inner end a hub extending into the hopper A4, one of these hubs, lettered C', being shown in Fig. 3. Two breaking-cylinders D D are mounted on the shafts B B2, respectively, and each of these breaking-cylinders is connected with the hub of the corresponding pinion in the manner indicated in Fig. 3, in which c is a lug formed on the hub C',l and CZ is a corresponding lug formed on the breaking-cylinder D, the two lugs c cl being in such engagement that the rotation of the pinion and its hub rotates the breakingcylinder in the same direction. The breaking -cylinders are provided with projecting teeth T, which pass between corresponding ridges R (see Figs. 2 and 3) and serve to crush any coarse material-such as ear IOO corn-placed in the hopper, and thus prepare it to be operated upon by the grinding mechanism beneath. Immediately beneath the breaking-cylinders D D' and in the bottom of the hopper is an opening extending from end to end of the hopper and from one side partly across the bottom thereof, and just under this openingis a slide E, also extending from.

end to end of the hopper and adapted to be moved from side to side in order to wholly or partly close the opening over it. (See Figs. 2, 3, and S.) On the lower face of each of the ends of this slide is formed a rack having a suitable number of teeth, and in engagement with this rack is a pinion ZJ, mounted on a shaft Iu,joiir11aled in the Walls of the casting A2 and provided at one end with a notched hand-wheel F, Fig. 3, by means of which it may be turned for the purpose of moving the rack. A pawl f, pivoted to the casting A2, engages the hand-wheel F and serves to hold it stationary in any given position, and thus to secure any desired opening between the hopper` and the chamber beneath, and thereby regulate the feed from the crushing mechanism to the grinding-chamber.

In the hollow casting A2 are two spaces or chambers lying on opposite sides of the grinding-chamber and communicating with the interior of the grinding-chamber through the openings in its ends already mentioned, and immediately below these two spaces or chambers are shallow semi cylindrical depressions formed in the base A, as indicated in Fig. 2. In the bottom of each of these depressions is an opening which is closed when the mill is in use by means of a plate II, provided with an oblique ridge R', formed on its uppersurface. Each of these plates has a downwardly and laterally extending arm Zt, which is held in place by means of a bolt 71,', provided at its upper end with a nut n and at its lower end with a wooden pin p', in the manner indicated in Fig. 2. The upper end of each of the bolts 7L passes through a flange on the base A, while its lower end is connected with the arm 71J by means of the wooden pin, and the nut n provides for drawing the plate upward into position and holding it there securely. lVhen an y unusual or excessive strain is brought to bear on the plate, however, the pin p' breaks and the plate drops down and relieves the strain.

Immediately above each of the plates II is a feeding-cylinder G, provided with teeth T', havin g bevel edges adapted to co-operate with the oblique ridges R' on the plates II and force grain or other material from both directions into the grinding-chamber. These feedin g-oylinders extend into the grinding-chamber and engage at their inner ends with a plate I, Fig. G, mounted on and loosely keyed to the shaft. One of the teeth T of each of the feeding-cylinders enters a corresponding opening in the plate I, so that the rotation of the plate with the shaft rotates the feedingcylinders, and the plate itself is provided with a series of marginal lugs t', entering corresponding' notches inthe inner margin of a donble-faeed annular grinding-plate K, Fig. G, having projecting lugs 7n, which serve to scrape the meal from the bottom of the grinding-chamber and carry it to the dischargespout a', through which it escapes. The double-faced grinding-plate K lies approximately at the center of the grinding-chamber and on opposite sides of it, and co-operating with it are two stationary grinding-plates K' K2, seated in frames L L', in the mannershown in Fig. It. Each of these frames has outwardly-projecting lugs Z, which rest upon correspondingly-plaeed lugs Z', formed on the inner face of the grinding-chamber and preventing rotation of the frame, and each f rame is also formed with hooked or undercut lugs Z2, which secure the grinding-plates K' F2 in place, the grinding-plates being provided with marginal lugs which pass into the notches in the lugs Z2 and are retained thereby. The frame L has on its outer face a cylindrical neck N, which rests in a corresponding bearing in the base-plate, the neck and the bearing being both turned to t accurately, and thus secure the centering of the frame and the grinding-plate which it supports. Longitudinal movement of the neck N in its bearing is prevented by means of a shoulder n', which forms a stop for the end of the neck.

The frame L is provided on its outer face with a neck N', restingin a bearing in thebaseplate and serving to center the frame and its grinding-plate but the neck N' is free to move longitudinally in its bearing for the purpose of adjusting the grinding-plates K K2 upon the shaft, and thereby varying thespaces between the central double-faced grinding-plate and the two outer non-rotating plates.

rlhe frame L' is adjusted by means of the mechanism illustrated in Figs. 1, Lt, and 7, in which O is a yoke mounted loosely on the shaft and extending laterally in opposite directions therefrom, and o o are two rods having their ends seated in sockets in the inner face of the yoke and the outer face of the frame L. A lever I), pivoted at one end on a vertical boss formed on the base A, rests against a lug on the center of the outer face of the yoke O, and is operated by means of a bolt P2, passing through the free end of the levcrand provided with a notched hand-wheel F', resting against the end of the lever and serving to press the lever against the yoke, and thereby to lessen the spaces between the grinding-plates. A pawl j', pivoted to the lever P, engages the hand-wheel and prevents its accidental rotation, and it is evident that by means of the lever, the hand-wheel, and the pawl the plates may be adjusted as dcsired and held securely in any given position.

In the construction of the various parts hereinbefore described various details are embodied which serve to cheapen their manufacture and facilitate their connection and IOO combination in the machine. Thus, for instance, the discharge-spout a' is held in place by means of a lug a2, Fig. 2, formed on the lower surface of the spout near its inner end, and a single bolt and nut connecting' the upper part of the inner end of the spout with the wall of the grinding-chamber. The lug a2 being first brought into engagement with the wall at the lower margin of the opening into the grinding-chamber, the spout is next brought into working position and the bolt inserted, and the fastening of the spout in place is thereby completed. The connection of the pinions b2 b2 with the crushing-cylinders is another instance, and the connection of the feeding-cylinders G with the grinding mechanism on the shaft B is still another. The connection of the grinding-plates K' K2 with the frames that hold them, through the simple rotation of the grinding-plates into such a position as to bring their marginal lugs into engagement with the undercut lugs of the supporting-frames, is an extremely simple and convenient mechanical device, and the connection of various of the parts by means of their own Shapes and without the use of bolts, screws, or keys is resorted to wherever the general construction of the milll will allow it.

The operation of the mill hereinbefore described, while sufciently evident from the detail description of the parts, may be again briefly stated. Coarse material, such as ear corn, being placed in the hopper, is crushed by means of the rotation of thecrushing-cylinders D D', the crushed product being admitted to the chambers below the hopper through the opening in the bottom thereof at a rate dependent upon the position of the regulating-plate E,Which may be adjusted as desired by turning the hand-wheel F. On reaching the chambers below the hopper and on opposite sides of the grinding-chamber the crushed material comes in contact with the feeding-cylinders G and is forced from both directions into the grinding-chamber, where it is subjectedto the action of the double-faced rotating grinding-plate K and the stationary plates K K2, which lie on opposite sides thereof. The space between these plates may be regulatedas desired by means of the yoke O, rods 0, lever P, and the parts co-operating therewith, and the ground material, after passing from the spaces between the hoppers, is carried by the lugs or Scrapers on the central grinding-plate to the discharge-spout, where it escapes. Provision for unusual and excessive strains upon the parts is made by the use of the breaking-pin 79, which connects the crushing mechanism with the main drivinggear and of the breaking-pin p', forming a part of the support of each of the bottom plates, which lie under the feeding-cylinders. The connection of the pinions b2 b3 with the crushing-cylinders facilitates the separation of the parts and the replacing of such parts as maybe broken,and the same thing is true ply fed through the opening at the bottom of the hopper to the feeding-cylinders below.

Having now described and explained my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination, with the hopper A4,

the shafts B' B2, and the crushing-cylinders D D', of the engaging-pinions b2 b3, mounted on said shafts, and the gear-wheel h', mounted on the same shaft with the pinion b2, said pinion being provided with an arm impinging upon a break-pin p, set in the gear-wheel, whereby the motion of the gear-wheel is communicated to the crushing-cylinders through said breaking-pin and excessive strain upon the crushing-cylinders may break the pin and destroy the connection between the gear-wheel and the crushing mechanism, substantially as and for the purpose set forth.

2. The combination, with the base Av and the shaft B, journaled therein, of the doublefaced central grinding-plate rotating with the shaft, the non-rotating frames L L', lying on opposite sides of said central grinding-plate and provided with the undercut lugs Z2andwith means for centering them, and grindingplates K' K2, provided with marginal lugs adapted to enter and to be secured by the undercut lugs Z2, substantially as and for the purpose set forth.

3. The combination, with the base and the shaft B, journaled therein, of the plate I, keyed to the shaft, the grinding-ring K, connected with said plate and rotating therewith, the non-rotating frames L L', formed with necks N N', respectively journaled in bearings in the base, the grinding-plates K K', secured in said frames, and mechanism for adjusting said grinding-plates, consisting of the yoke O, rods o 0, connecting said yoke with the frame L', the lever P, adapted to be pressed against said yoke, and the bolt P2, and hand-wheel F', adapted to operate said lever, whereby the spaces between the grinding-plates may be varied as desired, substantially as and for the purpose set forth.

4. rlhe combination, with the base-plate, the main shaft journaled therein, and the grinding mechanism and feeding mechanism mounted thereon, of the detachable bottom plates H H, lying beneath the feeding mechanism and co-operating therewith, the arms or levers h, formed on said plates, the bolts 7L', connecting the free ends of said arms with the base plate, and the breaking-pinsp, forming the connection of said bolts with said arms, whereby excessive strain upon the feeding mechanism may break said pins and disconnect said bottom plates from the bedplate, substantially as and for the purpose set forth.

IOO

IZO

ing at their inner ends the plate I, whereby the rotation of the shaft rotates both the 1o grinding and feeding mechanism, substantially as and for the purpose set forth.

DANIEL C. STOVER. Witnesses:

W. A. MERRIFIELID, L. HUGHES.

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