US498037A

US498037A - sturteyant

Info

Publication number: US498037A
Authority: US
Publication date: 1893-05-23
Anticipated expiration: 1910-05-23

Description

3 Sheets-Sheet 1.

Patented May 23, 1893.

MILL.

(Hommel.)

` T. L. STURTEVANT.

lwemr mamas L Sr/6740? y ha @n "ings (No Model.) ssneets-sheet 2.4

' T. L. STURTEVANT.

MILL. No. 498,037. Patented May 23, 1893.

(No Model.) 3 Sheets--Slleetv 3.

T. L. STURTEVANT.

Y MILL.

No. 498,037. Patented May 2s, 1893.

me wams percus co. Pnofauruc.. WASHINGTON, n c

Nrrn STATES PATENT OFFICE.

THOMAS L. STURTEVANT, OF FRAMINGHAM, ASSIGNOR TO THE STURTEVANT MILL COMPANY, OF BOSTON, MASSACHUSETTS.

MILL.

SPECIFICATION forming part of Letters Patent No. 498,037, dated May 23, 1893.

Application led August 9, 1892.`

To @ZZ whom t may concern:

Be it known that I, THoMAs L. STURTEVANT, a citizen of the United States, residing at Framingham, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Mills, of which the following is a specification.

My invention particularly relates to mills for crushing and grinding ores, phosphates, cement and other like hard and refractory materials. It constitutes certain improvements on the attrition mill shown in my patent, No. 255,550, of March 28, 1882. The mill shown in this patent comprises a rotary chambered member, and a chamber connected with a feed hopper. The organization and operation are such that the material in a coarse or rocky condition is caused to act upon itself, to reduce itself into a comparatively tine or granular condition. Such a mill both crushes and grinds the material in a most economical and efficient manner. It is very powerful and there is little wear and tear on the parts and hence it is durable. Heretofore in running this mill, all the material has not been reduced to the desired size, an'd it has been customary to transfer the iner reduced material to buhr stones, or similar millstones, to nish it or reduce it to the desired powdered form. The coarser material has been conveyed by elevator buckets, or similar elevators, to the feed hopper, and has been passed through the mill, where it is re-ground to a line granular form, suitable for finishing in the mill-stones, as above stated.

The object of my present invention is to improve the mill shown in my patent above referred to in such manner that it shall act more efficiently to crush and grind the material fed to it, and shall also at one operation reduce the material to the desired degree, thus obviating the necessity of re-grinding in buhr stones or of re-conveying the coarser material to the feed hopper. l therefore employ, in addition to the rotary chambered member and the chamber connected to the feed hopper, grinding surfaces operated coincidently or simultaneously with the rotary chambered member, and adapted to act on the reduced material to grind and pulverize it to the desired degree.

Serial No. 442,558. (No model.)

In the accompanying drawings,-Figure l is a view, partly in longitudinal vertical section, on the line 1*-1 of Fig. 2, and partly in elevation, of a mill embodying my improvements. Fig. 2 is a transverse section, ou the line 2-2 of Fig. l. Fig. 3 illustrates a modification in which one of the grinding surfaces is rotary and the other stationary. Fig. 4 illustrates a further modification of the organization shown in Fig. 3. Fig. 5 is a view in longitudinal vertical section, on the line 5--5 of Fig. 6, of a mill in which the feed hopper is connected at the side to the crushing and grinding members. Fig. 6 is a transverse section of the same, on the line 6--6 of Fig. 5, and Fig. 7 is a detail view of a further modication.

In Figs. l and 2 I have illustrated a mill embodying two rotary chambered members, in combination with grinding surfaces.

Separate shafts A and B, are mounted in standards A', B, supported on a suitable bedplate C. The shafts have suitable bearings a, b, and carry driving pulleys A2, B2. Each shaft carries at its inner end a flanged head D, D', to which is secured a cylindrical casing or bushing E, E', the inner ends of which are arranged a sufficient distance apart to accommodate the stationary central member F. The parts D, E, and D', E each constitute a rotary chambered member and they are adapted to revolve in opposite directions. The standards A and B are adjustable on the bed-plate by hand-wheels Gr, and gearing g, in order that the distance between the chambered `members may be varied, and a finer adjustment may be obtained by the hand wheels H, and the lock-nuts h.

Material to be ground is fed from the h0pper I, through an opening f,in the stationary member F, and, in a coarse rocky condition, passes from the hopper into the chambered members on each side, which throw it inwardly and cause the rocks to act upon themselves forcibly and powerfully so that they are crushed and broken up and more or less powdered. Soon after the crushing operation has commenced, a portion of the finely reduced material adheres to the recessed heads and takes the form indicated by dotted lines at thus forming a protective lining for the IOO heads or chambered members, and preventing wear except at `the extreme inner beveled edges of the cylinders or bushings E, E.

In the mill shown in my patent above referred to, the reduced material was discharged through a screen, and this screen was subject to more or less wear, and it was necessary from time to time to renew it. I nowomit the screen, and, as shown in Fig. l, surround each chambered member with .a stone or grinder K, which may be of buhr stone, or it may be a composite stone comprising small irregular lumps of emery and a binding material. So far as the scope of my invention extends, however, any suitable grinding material may be employed, but I prefer those* specifically mentioned.

The central stationary member F, has an opening F', extending through it and communicating With the passage f, leading to the feedhopper, and the outer sides 'or edges of the stationary member are in suitable proximity'to the grinders K, t0 reduce the grannlar material passing from the chambered members tc the desired degree. Any suitable exit may be employed for the powdered material.

I have shown the working parts of the4 mill surrounded by a casing L, and I preferably employ a discharge opening L', at the bottom thereof; out readily from between the grinders, v is guided by the casing to the dischargespout or opening L', from Which it may be' delivered to a suitable receptacle.

The grinders K, as above explained, are carried bythe rotary members E, E', whichl revolve iiropposite directions, and the grinding surfaces may be adjusted by means of the hand-wheels Gand H, in the manner before explained, to regulate the size or tineness ofthe material discharged from 'the machine.

In Fig. 3 I have indicated a slight modification. be stationary, While theV other rotates. The grinder-M, on the left hand side', has a'fcentral chamber m, which communicates with an opening m', at the tcp, connected with the feed hopper I. The rotary chamber-ed lmember E, and the grinder K, are similar in all respects to those indicatedat E and K', iny

Fig. 1. Motion may be imparted to the shaft Ain any suitable Way. The chambered members and grinders are surrounded by a suitable casing L, and the material is discharged through an opening L', in the casing.v

In Fig. 4 the arrangement is substantially the same except that the chamber m, in the* stationary member M, is somewhatv larger indiameter than the chamber in the rotary member.

The mill shown in Fig.- 5 is simpler and less powerful than that shown in Fig. 1. The

chambers are formed in the grinders N, N', and these are surrounded by a suitable cas- 1ng L. The grinder N is stationary, and may All the reduced material passingy As there shown, one member mayf be cemented in the casing, as indicated. The grinder N is cemented to a flanged frame O, secured to the shaft A, which has bearings 0, in suitable standards or brackets P. One end of the shaft is provided with an adjusting hand-wheel R, carried by a screw r, having ahead r', between which and the shaft are interposed anti-friction balls r2. The screw passes through a head r3, in acylinder r4, and this cylinder is surrounded by a spiral spring T5, within a casing r6. This construction affords a desirable arrangement for adjusting .the grinding surfaces.

The hopperI is provided with an adjustable feed-spout I', of well known construction "andthe material to be ground' is delivered from the spout to archute l2, communicating with another chute I3, which delivers the .coarse or rocky material through an opening@ to the chambers of the grinders.

A similar mill to that just described may be constructed with a feed-opening at the top,

as indicatedin Fig. 7; This figure shows'th-e other parts of the mechanism substantially the-same as those indicated in Fig. 5.

.- A mill constructed in accordance withmy einve'ntionA possesses many advantages.A Itv grinds fine at one operation. There areno tailings to be returned foi1 re-grindin'g, and screening is dispensed with.y No auxiliary y'Ii'nishin g machineis necessary. The mill will iact'o'n either wet or dry material, and isnot easily clogged. All thel partsfof themach-ine are'- strong and durable, and, as the forcel required to reducey the material is mainly exp`ended by the largerrocks striking againstthemselves, andk breaking up into granular form', the strainonthe Workingeparts 1s materially reduced, and for this reason themill runs more easily, works more-efficiently', andv lasts much longer Without repair.V

I claim as my inven'tion-A 1. A crushingiand grinding -mill comprising ia chamber to which'the material to be re-- duced is`fed,za'rotary cup-shaped member having an en'd piecefand a'deep cas-ing. ory

-bushing proj ectingat substantially-rightanigles from-the end piece, an annular grinder surrounding the fouterend of the'lcup-shaped casing;l and' connected thereto to revolve therewith, and an opposinggrinder-adjacent to said rotary-grinder.

2. A crushing and grinding mill comprising a chamber to which'y the' material'to bereduced is fed, a cup-shapedmember revolving kabout a horizontal axis byJ which .the-coarse' material is vmade-to act upon'itself to reduce jitself to a granular form and Which comprises a closed'end with a'cylindrical casing projecting at right angles therefrom and form# ing a chamber having a'smooth interior sur- Fface',an annular grinder surrounding the outer ,end of the chambered member, another an- `inular grinder in close proximity thereto and meansffor adjusting the chambered'member' `and one grinder relatively to the other grinder'.

3. A crushing and grinding mill comprising IOC IIO

a chamber to which the material to be reduced is fed, a rotary cup-shaped member comprising an end piece, and a cylindrical bushing or casing projecting at right angles therefrom and greater in length than onehalf the diameter of the head, and adjustable grinding members surrounding the rotary chambered member to further reduce the material before it is discharged from the inachine.

4. The combination of a central stationary chambered member, a feed hopper communicating therewith, a rotary cup-shaped member on each side of the stationary member, each comprising a head piece, provided with a cylindrical bushing projecting at rightangles from the head piece, means for rotating the chambered members in opposite directions, and grinders having parallel grinding surfaces surrounding the chambered members, substantially as set forth.

5. The combination of a central, stationary grinder having a central chamber, a feed hopper communicating with an opening in the central grinder which leads to the central chamber thereof, a rotary chambered member on each side of the'stationary grinder, each comprising an end-piece and a cylindrical bushing projecting at right angles therefrom means for rotating the chambered members in opposite directions, and an annular grinder on each side of the cent-ral grinder and surrounding the chambered members, substantially as set forth.

6. The combination of a chambered meniber to which the material to be ground is fed, a rotary chambered member communicating therewith, and comprising an end-piece and a cylindrical bushing projecting at right angles therefrom grinders surrounding the r0- tary chambered member composed of small, irregular lumps of einery and a binding ma terial, means for rotating the rotary chambered member and one of the grinders, a casing surrounding the working parts ofthe apparatus and provided with a discharge opening through which the finely reduced material is delivered.

In testimony whereof I have hereunto subscribed my naine.

THOMAS L. STURTEVANT.

Witnesses:

EDWARD H. MASON, W. H. ELLIS.