US296096A

US296096A - Ore-crusher

Info

Publication number: US296096A
Authority: US
Publication date: 1884-04-01
Anticipated expiration: 1901-04-01

Description

\ iour or more sections, for convenience in conl trough, which is V shaped in cross-section,

i 3 To a/ZZ whom t may concern:

. Nirnn STATES PA'rnNr @rincer JACOB CHARLES wrswnLL, `onirunronn, MASSACHUSETTS.

ORE-CRUSHER.

SPECIFICATION `forming part of Letters Patent No. 296,096, dated April 1, 1884.

Application filed Xovrmher 8, 1F83. (No model.)

. Be it known thatl, JACOB CHARLES WIS- WELL, a citizen of the United States, residing at Medford, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Ore-Crushers; and I do hereby declare the following to be a l full, clear, and exact `description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, `which form a part of this operation becomes necessary.

, specification.

` z hereinafter described and cla1med,1n a class of This invention'consists in improvements,

mills `for crushing ores or other hard substances, in which a series of rollers pivoted to a rotary Carriage travel in a circular path about a stationary bed, and operate to reduce the material by crushing action.

The drawings accompanying this specification represent, in Figure 1, a plan, and Fig. 2

a cross-section, of a mill embodying my improvements. Fig. Sisa detail View, on an en- `larged scale, of one of the springs 71y and adj acent devices.

In said` drawings, A represents the base or bed of the mill, the same being of cast-iron or stone and circular in form, and preferably in this trough being formed in the top of the bed A, `near the circumference of the latter. At

i l the bottoniof the trough 13,1 provide at intervals passages c u, 8vo., to permit of taking off the amalgam, andof escape of materials used in cleaningthe trough, when the latter The upper portion of the trough is continued by annular curbings c c,oi' wood or other material, and in the outer one, c, of such curbings I form i ertures d d, Sie., each of which islcovered by per end of said shaft beingj ournaled in a beara screen, e, of suitablematerial.

`C represents a vertical shaft, which at bottom is stepped in a block, D, secured to the top of` the` bed A, centrally of the latter, the upi ing supported by a horizontal beam, E, or

other object, in such manner as to be capable of a certain amount of vertical slip. The shaft C is rotated by a miter-gear, F, secured" to its upper part, which engages with and is driven by a similar gear, G, secured toa countershaft-H, suitably supported and driven. To the lower part of the shaft C, I secure a horizontal carriage, I, and in this carriage four axles, J J J J, have their outer bearings, the inner end of each axle being stepped in a bearing secured to the shaft. To the extreme outer end of each axle I secure a circular roller, K, which is adapted to revolve in the trough B; hence the periphery of each roller is of a V form in cross-section, corresponding to the trough. The inner half, f, of each roller ts closely to the corresponding side, g, of the trough B,"and isa conic frustum of which the apex is the axis of vrotation of the shaft C. Owing to this form of the periphery of the inner half of the roller, and Vthecorresponding shape of the inner side of the trough, such periphery adapts itself naturally to the bed and traverses the latter with ease, free from slip and lost motion, which reduces the fric-` tion to the minimum, for which reason the rollers can be run very rapidly and this, in addition to the comparatively large number of rollers employed, enables me to reduce the material Yvery rapidly and economically. If the outer half of each roller tted snugly to the trough, a certain slip and abrasive action would ensue between the two, and to avoid this I separate this portion of the roller slightly from thebottom of the outer side of the trough. A certain amount of preliminary crushing is effected by the outer half of each roller; but the bulk of such crushing is effected by the inner half. The material, as it is reduced to the requisitedegree of neness,is thrown upward and outward bycentrifugal force of the revolving rollers and escapes through the apertures d d, Sto., in the wall of the trough, and is screened i-n passing the screens e e, &c. To relieve the strain on the bearings of shafts J incident to grinding, I make use of springs h, which are set into recesses on the under Side of the carriage I, and bear against the outer bearings of said shafts. The pressure of said springs-may be regulated by means of adjusting-screws h', as illustrated in Figs. l and l3,

IOO

rIhis mill is designed to operate strictly by crushing the material, which leaves the particles ina normal crystal form. This result is veryiinportant in the reduction and preparation oi'auri fero ussul ph urets and other classes of ores which are to be concentrated and the precious metal collected by any of the mercurial processes.

Mills which operate to reduce the material by attrit-ion or abrasion leave the particles in a very unfavorable condition for concentrating and amalgamation, as the sharp corners are worn off; hence the importance of a mill which operates strictly to crush the material and preserve the crystal form ofthe particles.

I am aware that itis not broadly new to employ a series of grinding-rolls having V-shaped peripheriesifor the purpose of grinding ore,

said rolls revolving together and rotating individually in a circular V shaped groove, l which receives the ore to be ground; and therefre Ido not claim the same,- nor do I claim, 1

broadly, the use'of a curbing to extend such a groove upward, nor outlets for the amalgam, nor openings and screens for allowing the exit of comminuted ore; but

What I do claim is- The combination of a series of crushingrollers having V-shaped peripheries,and horizontal shafts on which said rollers are mounted, with a carriage in which said shafts are journaled at their outer bearing-points, a vertical shaft 'in which the inner ends of said horizontal shafts are journaled, springs which are interposed between said carriage and said horizontal shafts, and a stationary bed having a circular V-shaped groove in which said rollers travel, substantially as set forth.

In testimony whereof I affix mysignatnre in presence of two witnesses.

JACOB CHARLES VISWELL. Vitnesses:

F. CURTIS, A. F. I-IAYDEN.