US233383A

US233383A - Ore-grinding

Info

Publication number: US233383A
Authority: US
Publication date: 1880-10-19
Anticipated expiration: 1897-10-19

Description

J. H. L. TUGK. Ore Grinding Mill.

No. 233,383. Patented Oct. 19,1880.

- i e A \E\\\ UNITED STATES PATENT OFFICE.

JOSIAH H. L. TUOK, OF SAN FRANCISCO, CALIFORNIA.

ORE-GRINDING.M|LL.

SPECIFICATION forming part of Letters Patent No. 233,383, dated October 19, 1880.

Application filed January 19, 1880.

To all whom it may concern:

Be it known that I, JOSIAH H. L. TUGK, of the city and county of San Francisco, in the State of California, have invented certain new and useful Improvements in Orushin g and Grinding Mills; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings.

My invention has reference to that class of mills for crushing and grinding ores and other substances in which one or more rollers are made to traverse in a circle around a fixed center, so as to crush and grind the substance to be ground or pulverized between the rollers and the bed-plate upon which they travel.

My invention consists in a novel construction and arrangement of the bed-plate and the rollers with their shafts resting upon springs or elastic cushions in a ring, by which I provide a cheap, simple, and effective ore-mill, all as hereinafter more fully described.

Referring to the accompanying drawings, Figure 1 is an elevation of my invention with the bed-plate, outer rim, and distributing tub or hopper in vertical section. Fig. 2 is a plan view of the shafts with their bevel grinding wheels or rollers and theoutersupporting-rim.

A is the bed-plate, which ordinarily I shall make stationary while the rollers traverse around upon it; but the operation might be reversed, so as to rotate the bed-plate while the rollers remained stationary. The latter plan would be more expensive and not so convenient as the former. The upper surface of the bed-plate I make conical or tapering from its center to its periphery, and at proper distances apart I make two or more concentric V-shaped grooves, 11, in its upper face, so that the grooves will be at equal distances from each other between the center and periphery. Around the outside rim of the circular bed-plate I secure a vertical wire-gauze rim, 0, which extends high enough to form the discharging-screen. Above the apex or center of the bed-plate I secure a rotating head, D, by. means of a vertical spindle, e, which passes down through the center of the head and into or through the bed-plate, so that the head can rotate freely on the spindle. In the present instance this head is represented to be atub or vessel, with holes through its bottom at different points, thus forming a convenient distributor for feeding and distributing the ore or pulp upon the bed-plate, as hereinafter described.

G G G are horizontal shafts, the inner ends of which bear in the sides of the rotating head or tub D, while their outer ends bear in a heavy ring, H, which is somewhat larger than the circumference of the bed-plate. On each shaft G, I secure as many wheels, I, as there are V-shaped grooves in the bed-plate, and these wheels are graduated in size according to the pitch of the bed-plate, so that when the shaft is horizontal each wheel will bearin its groove. The rims of these wheels are made V-shaped to correspond with and fit into the V-shaped grooves in the bed-plate.

The V-rims of the wheels and the V-grooves in the bed-plate I will cover with chilled-iron shoes, which can be removed and renewed as fast as they wear out.

It will now be seen that the wheels I support the weight of the shaft G and outside ring, H, and that neither wheel on any one shaft can be lifted without lifting the weight of all the other wheels on the same shaft and also the ring.

In the bearings, above the end of each shaft, I place an india-rubber cushion or spring, V, which. will allow the shaft to yield upward should one of the wheels move over any substance that the weight of the rollers will not crush.

To drive these wheels power is applied to the ring H either by a belt, as represented in the present instance, or by forming cogs on the ring and driving it by means of a spurgear. When the ring is driven by a belt a groove is made in its face, as shown, for the belt to run in.

When power is applied to drive the ring H the horizontal shafts G will be carried around the center in a circle, and each shaft G will rotate independently in its bearings in the head D and ring H, so that all the wheels on each shaft will rotate simultaneously, the smaller wheels near the center and the larger wheels near the periphery.

The ore and water or pulp are fed into the distributing-vessel D at the center of the conical bed-plate, and as this vessel is rotated slowly The action of the inner or small rollers is a crushing action, because of their slow motion and the greater crushing eti'ect which their position in the line of crushing-wheels gives them. Theshaftstl arelevers. their innerends, i

where they bear in the head 1), being the fulcrnm, while the ring and outside wheels t'orm the weight, so that in order to raise the inner rollers the weight of the outside large rollers and the ring must also be raised. This gives the small rollers an extraordimiry crushing efl'ect. The outside rollers travel faster than the inside rollers, so that they give the best grinding etl'ect. and thereby reduce the ore or pulp to great fineness.

The V shape of the grooves and rims ot the wheels is also an important element, as the particles are crushed by a rubbing aetion between the inclined faces of the. grooves and the inclined faces of the wheel -rim. The l grooves serve to concentrate the pulp in the t tracks of the wheels, so that; the action of the wheels is rendered very effective. This construction and arrangement provide a very simple and cheap ore-mill, which posl sesses great capacity and will do thorough t work. I The sereeirrim might be omitted and some t other screening device employed; but the i screen-rim is convenient and effective. l llaving thus described my invention, what I claim, and desire to secure by Letters Patent. is- I In an ore grinding and crushing mill, the t combination, with the tapering concentricallyl grooved bed A. having the spindle c, with a t'eeding tub or hopper. l), of the radial shafts (L, having the unitormly-varyirig-sized stones or rollers [,and bearing-ring H, provided with springs V, under which the outer ends of the shafts rest, suhstantiallyas and for the pur pose set forth.

In witness whereof I have hereunto set my hand and seal.

JOSIAH I]. L. TUCK. \Yitnesses:

JNO. IA. BooNE, Wu. F (LARIL